Silence a. p. a method of burning gaseous fuel, a device for its implementation and swirl to implement device

 

(57) Abstract:

The invention relates to energy and can be used in aggregates of heating systems, such as furnaces furnaces and boilers. The method of burning gaseous fuel includes a thread forming a mixture of fuel with air with different ratio of components and consequent burning of the mixture in the flow, and combustion of the second flow of the mixture it together with unburned remnants of the first stream of the mixture and combustion products of this thread, and the ratio of the costs of the mixture in the streams selected from the conditions obtaining in the area of the combustion mixture having an average value of the coefficient of excess air in the rangein<inandnrespectively the upper and lower concentration limits of Flammability of the mixture. A device for implementing the method of burning gaseous fuel contains attached to the embrasure of the furnace body with a built-in insert, forming channels for submission to the breach flow of the mixture of fuel with air, with the possibility of tightening, as well as the Central body installed inside the first channel with the possibility of axial movement, and the node distribution of the fuel, made in the form of an annular chamber with atverti or more blades, made in the form of cha - stay conical surface and offset from the longitudinal axis. The method of burning gaseous fuel and a device for its implementation provide the ability to stabilize the flame, the combustion efficiency and a low concentration of nitrogen oxides in the flue gases, and swirl to implement the device provides stabilization of the flame without heating elements. 3 C. and 24 C.p. f-crystals, 9 Il.

The present invention relates to energy and can be used in aggregates of heating systems, for example, in furnaces furnaces and boilers.

A known method of burning gaseous fuel, comprising receiving a mixture of fuel with air, the separation of this mixture into two streams, the feed flows counter-inclined and the impact of these flows with getting fan-shaped torch, with collision fuel flow coefficients of excess air in their internal and peripheral support layers, respectively, smaller and larger stoichiometric [1].

The use of this method provides the possibility of burning part of the fuel in non-stoichiometric ratio with air, which should reduce concentrationtime, where >1 and <1, and when mixing the two streams before burning on the borders of the regions >1 <1 receive the mixture okololiteraturnogo composition, the combustion of which produces the maximum amount of oxides of nitrogen.

The analog prototype is a method of burning gaseous fuel, comprising receiving a mixture of fuel with air, the flow of the mixture, its turbulization and burning, as well as controlling a given length of the flame in the combustion mixture[2].

This method does not exclude the possibility of leakage of flame and ignition of fuel-air mixture inside the burner, which is unacceptable. In addition, since the composition of the mixture in this way should be close to the stoichiometric amount of nitrogen oxides formed during combustion may be close to the maximum.

A device for implementing the method of burning gaseous fuel containing attached to the embrasure of the furnace at an angle to each other two buildings separated by inserts on the two longitudinal parts each, and the longitudinal axis of each body has a Central body and at the apex of the angle formed by the housings of the device to the embrasure summed output tube fuel [1].

The analog prototype is a device for implementing the method of burning gaseous fuel containing attached to the embrasure of the furnace body with a fixed therein by insert forming the mixing channels for filing in the embrasure of the respective flows of the mixture of fuel with air, and the turbulent lattice[2].

The device does not provide a reduction in the content of nitrogen oxides in the combustion products, and, moreover, does not preclude the possibility of leakage of flame and ignition of fuel-air mixture inside the burner.

Known tangentially-blade swirl, containing an internal channel and the vanes are mounted at an angle to the tangent of the circumference of the inner channel [3].

Swirl provides the ability to create a swirling air flow, but the resulting zone of reverse flow takes place inside the channel, which leads to the possibility of contact of the flame with the structural elements of the device.

The closest analogue prototype is a swirl of "ABB", made of two blades in the form of a half pecenkovic the possibility of creating a swirling flow with a high degree of turbulence and the axis of the flow near the exit zone of the reverse current, ensuring stabilization of the flame. However, for the swirl ceteris paribus characterized by large length necessary to obtain the desired bore formed in the shift halves of the cone slots for the admission of air.

The invention consists in that in the method of burning gaseous fuel, including the formation of flow of the mixture of fuel with air and burning the mixture in the streams and their combustion, flows form with different ratio of components of the mixture, and ensure the quality of mixing fuel with air, and the coefficients of excess air for these threads is chosen accordingly to the first streamin<2>nwhereinandnrespectively the upper and lower concentration limits of Flammability of the mixture,1and2the coefficients of excess air in the respective threads at the same time, after receiving the specified mix ratio in the streams, initially ignite the mixture in the first stream, and, after combustion of 30% or more of this mixture, the remainder of the mixture in the first stream and the resulting products of combustion combine with the second flow of the mixture and produce afterburning obyedinennyj flows, and the willow with air, with the average value of the excess air coefficient in the rangein< R1nand R1nequivalent radius of the first stream.

The invention consists in that the device for implementing the method of burning gaseous fuel containing attached to the embrasure of the furnace body with a built-in insert, forming channels for filing in the embrasure of the respective flows of the mixture of fuel with air? and swirl, equipped with a Central body and site distribution of fuel, installed near the input section inserts connected by pipeline with a fuel source configured to supply fuel to the first and second channels, the output section which is made subject to the conditions: S1+ S2SAand S2= (0,05 - 0,5)S1where S1and S2square of the output of the cross-section respectively of the first and second channels, and SA- size of the embrasures, the length of the insert l dewhere de- equivalent diameter of the loopholes, the Central body is installed inside the first channel with the possibility of axial movement or without it, and the cross-sectional area of the Central body SCT0,5 S1where all symbols cootey formed by the housing of the device and the intervals above and below the plate, respectively, or in the form of surfaces of revolution, for example, in the form of a shell, and the first channel is formed inside the shell, and the second between the shell and the housing or, for example, in the form of primary and secondary shells, concentric installed in the first channel.

In addition, insert its output section installed at a distance of l10.5 defrom embrasures or inside the loopholes.

With this Central body to its output section is set with a deviation from the output section of the insert in the direction of the gas or off-gas to a distance of d1Ewhere d1Ethe equivalent diameter of the output section of the first channel.

In addition, the Central body is made with a through channel inlet connected to a pipe for air supply and output are located on the output section of the Central body, and to this output section summarized the pipeline for fuel supply, and the output channel of the Central body has swirl.

When the node distribution of the fuel is made in the form of an annular chamber formed by two cylindrical surfaces with annular plugs on the ends, and the node distribution of the fuel can be made in the form of a plot of the annular node distribution of the fuel. In the node distribution in the cylindrical surfaces of the holes, the number, location and diameter are selected to provide the desired distribution of the fuel in the channels of the device. In addition, holes are made or the outer cylindrical surface of the annular chamber, and then the diameter of the inner surface of the annular chamber are made corresponding to the diameter of the Central body part installed inside the camera, or holes are made on the inner cylindrical surface of the circular chamber, then the diameter of this surface corresponding to the inner diameter of the device. While in the holes in the tubes are installed inputs connected to the internal cavity of the camera node distribution of fuel, and part of the tube outputs are placed in the first channel, and the other part of the tube outputs installed in the second channel of the device, and the length and number of tubes made with a view to ensuring distribution opportunities, including uniform fuel distribution in the cross section of the channels.

In addition, the length of tubes with holes placed in places where the tangent to the surface of the tubes parallel to the velocity vector of navegacao an insert in the form of primary and secondary shells pipes its output holes are placed in the gaps between the shells, moreover, the value of bigaps between the shells corresponds to the conditions bi= (0,05 - 0,5) deand biandi/2, where ai- the distance between the located at the same distance from the axis of the device outputs openings in adjacent tubes in the i-th interval between, for example, the shells, i 1, and the remaining symbols correspond to those shown previously.

The invention consists in that the swirl for the implementation of the device, made of blades in the form of parts of a conical surface, obtained, for example, by cutting the surface of a truncated cone by a plane passing through its longitudinal axis, which is offset parallel to the axis of the casing and connected, for example, bushings, offset simultaneously performed on the radii of the cross-section of the original housing relative to the first section of each part in the reference, for example, clockwise, the number of blades is chosen equal to n, where n is 3, and the amount of displacement of the blades is selected from the condition Sy= (0,2 - 2)Saboutwhere Sy- the area of the gaps between these parts, Sabout- area of a larger Foundation of the original cone, the ratio of the radius R of the larger base and the height H of the cone is selected from the condition R is orenia, the completeness of fuel combustion and a low concentration of nitrogen oxides in the flue gases.

A device for implementing the method of burning gaseous fuels provide stabilization of the flame, the combustion efficiency of fuels with a low content in the flue gases of nitrogen oxides, and also eliminates the possibility of leakage of the flame inside the burner.

Swirl to implement the device with a relatively small length enables the creation of vorticity of the flow of a small portion of air from the outlet of the swirl zone reverse current, "hanging" in the stream, resulting in stabilization of the flame without heating elements.

In Fig. 1 presents a diagram of the device for implementing the method of burning gaseous fuel; Fig. 2 is an example implementation of the device with an insert made in the form of primary and secondary shells and tubes that deliver fuel channels; Fig. 3 the arrangement of the tubes in the cross-section of the device shown in Fig. 2; Fig. 4 - execution scheme of the swirler of Fig. 5 - the same, lateral view; Fig. 6 is a General view of the layout of the swirler of Fig. 7 is a diagram showing changes in the concentration of nitrogen oxides in sa Fig. 8 is a diagram of the torch burner; Fig. 9 is a photograph of the torch.

A device for implementing the method of burning gaseous fuels (Fig. 1) includes a housing 1, which is connected with the duct 2 connected, for example, a fan (not shown) to supply air. In the housing 1 is installed insert, made in the form, for example, the shell 3 and is intended for the organization of channels 4 and 5 for the preparation and submission of the mixture of fuel with air. Inside the first channel 4 placed Central body 6, designed for ignition of the mixture and stabilization of the torch and made in the form of a cylinder with a through channel (Fig. not marked), inside of which is installed pipe 7 of the fuel supply, the output is placed inside the swirler 8 is installed near the outlet cross section of the Central body 6 and is intended to provide a spin flow with obtaining a reverse current on the axis and, ultimately, stabilization of the flame. In the Central body is a window 9 for supplying air to pass through the channel to the swirler 8.

In the first channel 4 also posted the node 10 distribution of fuel intended for the supply of fuel in the first and second channels 4 and 5 and is made in the form of an annular chamber formed tsilindricheskimi supply of fuel in the annular cavity (Fig. not labeled), and the cylindrical surfaces 11 and 12 with holes 15 for fuel in channels 4 and 5 for the formation of mixtures with air.

The housing 2 is connected with the recess 16 of the furnace.

Swirl 8 (Fig. 4 - 6) made in the form of three blades 17, designed to twist coming through the gap 18 between flow and is obtained by, for example, dissection of the surface of a truncated cone in three planes passing through the longitudinal axis of the cone and offset of the received parts of the surface parallel to the axis along the radius of the cross-section of the original cone relative to the first section of each part in the counting clockwise and United, for example, bushings (Fig. not shown). Thus the amount of displacement of these parts is selected from the condition Sy= (0,2 - 2)Saboutwhere Sy- the area of the gaps between the parts, Sabout- the area of the large base of the cone, and Sy= nck, where n is the number of slits (corresponds to the number of blades), with slit width, k is the length of the slit. This implies that ceteris paribus the execution of the swirl three or more blade allows you to reduce its length in comparison with, for example, a double swirl. The ratio of the radius R is complete swirl R = 0,2 H, a Sy= Sabout.

The device is equipped with standard parts, such as valves, and equipment, such as pressure gauge, control the flow of air and fuel (Fig. not shown), intended to set the desired mix ratio.

The insert 3 may be made in the form, for example plate (Fig. not shown), in this case, the channels 4 and 5 will be placed in the housing 1, respectively above and below the plate or in the form of primary and secondary shells (see , for example, Fig. 2, where the insert is made in the form of a main shell 3 and one additional shell 19, concentric installed in the first channel 4).

Here is an example (Fig. 2 and 3) execution node 10 distribution of fuel with the holes on the inner cylindrical surface of the circular chamber, and the diameter of this surface corresponding to the inner diameter of the housing 2. When installed in holes of the tube 20, the inputs connected with the cavity of the camera node 10 distribution of fuel, and part of the tubes (20.1) outputs placed in the first (4) channel, and the other part of the tubes (20.2) outputs installed in the second (5) channel. In addition, there is a part (half) of the number of tubes 20.1 outputs ustanovleniju additional shell 19 and the Central body 6. The value of the bithe gaps between the core 3 and the additional 19 the shells and between the additional ring 19 and the Central body 6 is selected from the condition bi= (0,05 - 0,5)dewhere de- equivalent diameter of the gas furnace 16. (If you embrasures round in cross section of the deequal to the diameter dAof this section).

It also met the condition: bi~ ai/2, where ai- the distance between the located at the same distance from the axis of the device outputs openings in adjacent tubes in the i-th interval between, for example, the shells.

In the given example box 3 its output section is placed inside the gas furnace 16, however, it can be installed at a distance of l10.5 defrom embrasures 16.

The Central body 6 with its output section can be set with a deviation from the output section of the insert 6 at a distance of d1Ewhere d1Eequivalent diameter of a first section (4) of the channel, while the Central body is arranged to move in the axial direction to control the parameters of channel 4 to ensure optimal performance of the device. In case the valence radius of the first flow R1Horder d1/2.

The number of holes in the node 10 distribution of fuel, their diameters and location for pick up based on the desired concentration of the fuel mixture and uniformity of its mixing, taking into account the specific geometry of the burner.

Since the General solution of this task or engineering dependencies for finding a solution is not found acceptable by determining these factors is either numerical modeling of the flow of fuel and air and mixing [5, 6, 7], or a bench-scale experiment with the measurement of the concentration distribution [8].

So in the implemented example of the device when dAND=340 mm for distribution of fuel in the first (4) channel in the node 10 distribution of fuel was carried out for 18 holes with a diameter of 9 mm and 5 mm, located on the cylindrical surface two rows, spaced at a distance of 130 mm, with holes to distribute the fuel in the second (5) the channel is not performed.

It is known that nitrogen oxides formed during the combustion of gaseous hydrocarbon fuel, not containing bound nitrogen, can to some extent be divided into two types - thermal and fast [9]. The latter more accurately termed oxides front, the impact of hydrocarbon radicals (CH, CH2and nonequilibrium elevated concentrations Of him. The concentration of oxides formed in the combustion front is relatively small and amounts to approximately 50 mg/nm3(refer to the NO2and =1,4).

Thermal oxides are formed, can be considered approximately as a result of oxidation of atmospheric nitrogen by known mechanism, which is usually called the Zeldovich mechanism [9]. The characteristic time of thermal NOx is several tens and hundreds of milliseconds, and their typical concentrations in modern furnaces boilers - on the value of 150-300 mg/nm3for the case of operation of the burners on a cold (~20o(C) air, 500-1500 mg/nm3for the case of operation in air, heated to 250-350oC.

Calculations show that the concentration of thermal NOx is strongly dependent on the composition of the combusted mixture. In Fig. 7 shows the calculated dependence of the concentration of thermal NRxresulting from the combustion of pre-mixed mixture of fuel with air, depending on the excess air coefficient [10] . From a consideration of the graph shows that the combustion of a homogeneous mixture with excess factor Vozdovac and steam boilers (thermal power of about 1 MW or more - 50-100 MW) work flow of fuel directly into the combustion zone or in front of it [9]. When this flame is mainly diffusive, i.e. the combustion of fuel occurs when the air excess factor 1. According to the data of Fig.7 shows that this produces the maximum amount of nitrogen oxides. All known ways of reducing the concentration of NO in combustion products is based on departure from stoichiometric combustion, however, existing designs of burners and furnaces do not provide results that differ from the above.

The situation can be radically improved if you apply in the combustion zone pre-mixed mixture of fuel, such as methane and air at a value such as in<2>in. For the time elapsed after the combustion of the mixture within<c13oand in the internal angle m7o. The combustion front at a speed of turbulent combustion, which very roughly can be taken equal to W', is distributed by the degree of turbulence W'/W = 0.1 angleg6o. At the meeting in point III the boundaries of the mixing zone II and the combustion front I will begin the combustion products of incomplete combustion mixture entering through the first 4 to the B>1= 0,8 dA, i.e., r1/rA=0.8, then that data can be used to estimate the proportion of the mixture of the first stream, burnt by the beginning of afterburn.

Let the radius of the torch at the point IV will be approximately equal to the radius of the Central body 6 comprising, for example, r4= rC.t= 0,3 rA.

Then the radius of the torch at the point III will be

< / BR>
or

< / BR>
Share Z of the burnt mixture of the first stream can be taken equal to Z= (r3/r1)2and after substitution adopted higher values for r1 and r4 we get Z=0,6.

It follows that at start of combustion will burn more than half of the primary mixture.

To increase the share of burnt mixture of the first stream can be achieved by increasing the speed of turbulent combustion Utand diameter dC.tthe Central body.

Speed turbulent combustion increases when the swirling flow. However, the effect of spin is ambiguous, because it increases the opening angle of the jet, i.e., the mixing speed.

A device for implementing the method of burning gaseous fuel is as follows.

By adjustment of valves and equipment through the duct 1 produce flow in the device wondertech. When this fuel through node 10 distribution of fuel blown into the jets transversely flowing air and the result of the interaction between air flow and fuel jets is stirring. The result is a mixture of fuel with air, and in accordance with a given ratio of components of the mixture of fuel with air in the first channel 4 get with the excess air coefficient lying in the rangein<2>n. (Here, as stated previously,1,2,nand inthe coefficients of excess air, respectively, into first and second streams (channels), as well as the lower and upper concentration limits of ignition of the mixture of hydrocarbon fuel with air. For mixtures such as methane, with cold airnandinaccordingly, you will be close to 0.6 and 1.8.

Using the swirler 8 produce a swirling flow of air passing through the Central body 6, which resulted around an axis of the device occurs return for.

In the area of reverse current through the tube 7 serves the fuel, which is ignited, for example, using elektrorazryadnykh or external ignition device (Fig. not shown), and establish a stable burning torch cent is the fact that through the first channel 4. After ignition of the main flame torch Central body can be turned off and stabilize combustion in the terminal area of the stream emerging from the swirl at the outlet of the channel of the Central body 6.

In the combustion zone in the region of the torch, corresponding to the combustion of 30% or more of a mixture of the first stream (the region of the combustion zone in Fig.8), serves a mixture of fuel with air from the second channel, combine this mixture with unburnt residues of the mixture coming from the first channel, and produce the afterburning of the combined mixture and combustion products of the mixture of the first channel.

By choosing the geometry of the flow part of the flow rates of the mixture in the first and second streams within the combined stream to receive the mixture with excess air coefficient with the average value in the range in< root-mean-square deviation from the average concentration value, relative value which in this case should not exceed , i.e., combusted mixture should be as close as possible to homogeneous.

When the feed stream supplied to the swirler 8 air admitted through slots 18 (as shown in Fig.6), and the output of the swirl (behind the plane of the large base of the cone) get a swirling flow having a high step is the implementation of the torch.

Shown in Fig. 9 photograph of the flame obtained when testing the device for implementing the method of burning gaseous fuel with a capacity of 8 MW, established in accordance with the scheme shown in Fig.1, and with a swirl made in accordance with the design shown in Fig.6, to the boiler PTVM - 100.

Measured when testing the device, the concentration of nitrogen oxides in the flue gases did not exceed 80 mg/nm3that is 2-3 times lower than the known burners.

Sources of information

1. RF patent 2050509 from 08.06.93.

2. RF patent 1700337 from 13.03.89.

3. Isserlin A. C. fundamentals of combustion of fuel gas, 2nd ed., Rev. and ext., Leningrad: Nedra, 1987, S. 40-43.

4. Sattelmayer Th. et al, Second Generation Law-Emission Combustors for ABB Gas Turbinen: Burner Development and tests at Atmospheric Pressure, ASME-90-GT-162.

5. Aksenov A. A., Guzowski A. C. Software package Flov Vision for solving problems of aerodynamics and heat transfer by means of numerical simulation // the Third Congress of the Association of engineers for heating, ventilation, kondensirovannie air, heat supply and building thermal physics (AVOK), 22-25 Sep. 1993, Moscow, Fri.reports, S. 114-119.

6. Gavriliouk V. N., Denissov O. P., Nakechny V. P., E. V. Odintsov, A. Sergienko, A., Sobachkin A. A.,ptx2">

8. Secundo A. A., Kazarin F. C., Miklashevsky I. R., Pickow K. N. The results of experimental studies of the mixer blast air. UTR, SIC, ECOLAN, M., 1993.

9. Segal I. I. Protection of air from fuel combustion. - Leningrad: Nedra, 2nd ed., Rev. and ext., 1988.

10. Tishin, A. P., Khudyakov C. A., Artamonov, A. K. a Study of the possibilities of reducing the concentration of nitrogen oxides from fuel combustion in teploenergozahita, ed. TsNIIMash, ,Kaliningrad, M. O., 1994, S. 60.

1. The method of burning gaseous fuel, including the formation of flow of the mixture of fuel with air and burning the mixture in the flow and combustion, characterized in that the threads form with different ratio of components of the mixture, and ensure the quality of mixing fuel with air, and the coefficients of excess air for these threads is chosen, respectively, for the first stream in<2>nwhereinandnrespectively the upper and lower concentration limits of Flammability of the mixture,1and 2the coefficients of excess air in the respective threads after receipt of the mix ratio in the threads first ignited mixture in the first stream, and the t with the second flow of the mixture and produce the afterburning of the combined flows.

2. The method according to p. 1, characterized in that the mixing quality provide for a given value of the standard deviation from the desired value of the concentration of the fuel in the stream.

3. The method according to PP.1 and 2, characterized in that the spinning air flow involved in the formation of flow of the mixture of fuel with air.

4. The method according to PP.1 and 2, characterized in that spin the air flow involved in the formation of the first stream of the mixture of fuel with air.

5. The method according to PP.1 and 2, characterized in that the spin of the air flow, which is involved in the formation of the second flow of the mixture.

6. The method according to PP.1 and 2, characterized in that the mixture of fuel with air in the first stream are formed by filing in the air flow involved in the formation of the first stream of fuel jets, the velocity vectors are set perpendicular to the velocity vector of the air flow and the radius and passing at a distance L from the axis of the stream, where L R1nwhere R1nthe equivalent radius of the first stream.

7. A device for implementing the method of burning gaseous fuel containing attached to the embrasure of the furnace body with a built-in vstavka trichomania fact, the device has a Central body and site distribution of fuel, installed near the input section inserts connected by pipeline with a fuel source configured to supply fuel to the first and second channels, which are made subject to the conditions: S1+ S2Saand S2= (0,05 - 0,5) S1where S1and S2square of the output of the cross-section respectively of the first and second channels, and Sasize of the embrasures, the length of the insert l dewhere de- equivalent diameter of the loopholes, the Central body is installed inside the first channel with the possibility of axial movement, and the cross-sectional area of the Central body SC.tselected using the condition SC.t0,5 S1where all symbols correspond to those shown previously.

8. The device according to p. 7, characterized in that the insert is made in the form of a plate, while the first and second channels formed by the housing of the device and the intervals above and below the plate, respectively.

9. The device according to p. 7, characterized in that the insert is made in the form of surfaces of revolution, for example, in the form of shells, while the first channel is formed inside the shell, and the second between obacunone at a distance of L10.5 defrom the embrasures.

11. The device according to PP.7 to 9, characterized in that the insert is installed to its output section inside the embrasures.

12. The device according to PP. 7 to 11, characterized in that the Central body to its output section is set with a deviation from the output section of the insert in the direction of the gas at a distance of d1Ewhere d1E- equivalent diameter of the first channel.

13. The device according to PP. 7 to 11, characterized in that the Central body to its output section is set with a deviation from the output section of the insert away from the embrasures to a distance of d1E.

14. The device according to PP.7, 12 and 13, characterized in that the Central body is made with a through channel inlet connected to a pipe for air supply and output are located on the output section of the Central body.

15. The device according to PP.12 to 14, characterized in that the outlet cross section of the Central body summed up the pipeline for fuel.

16. The device according to PP.7 to 15, characterized in that the node distribution of the fuel is made in the form of an annular chamber formed by two cylindrical surfaces with annular plugs on the ends, with node rascacielos distribution of the fuel in the channels of the device.

17. The device according to p. 16, characterized in that holes are made in the cylindrical surfaces.

18. The device under item 17, characterized in that the holes made in the outer cylindrical surface of the annular chamber, the diameter of the inner surface of the annular chamber are made corresponding to the diameter of the Central body part installed inside the annular chamber of the node distribution of the fuel.

19. The device according to PP.14 and 16, characterized in that the node distribution of the fuel is made in the form of a section of the Central body and the corresponding portion of the through-channel of the Central body made in the form of the inner surface of the annular node distribution of fuel.

20. The device under item 17, characterized in that holes are made on the inner cylindrical surface of the circular chamber, and the diameter of this surface corresponding to the inner diameter of the device.

21. The device according to PP.16 to 20, characterized in that the holes of the tubes are installed inputs connected to the internal cavity of the camera node distribution of fuel, and part of the tube outputs are placed in the first channel, and the other part of the tube outputs installed in the second channel is CNOMO section channels.

22. The device according to p. 21, characterized in that the length and number of tubes selected taking into account the possibility of uniform distribution of fuel in the cross-section of the channels.

23. The device according to PP.21 and 22, characterized in that the length of a tube with holes placed in places where the tangent to the surface of the tubes parallel to the velocity vector of air flow.

24. The device according to PP.21 to 23, characterized in that the tube cross-section is made, for example, oval.

25. The device according to PP.7, 9 and 21 to 24, characterized in that the insert is made in the form of primary and secondary shells, which are concentrically installed in the first channel, while the tube its output holes are placed in the gaps between the shells, and the value of bigaps between the shells corresponds to the conditions bi= (0,05 - 0,5) deand at the same time bi1/2 aiwhere ai- the distance between the located at the same distance from the axis of the device output openings of the tubes in the i-th interval, between, for example, the shells, i 1, and the remaining symbols correspond to those shown previously.

26. The device according to PP. 7 - 25, characterized in that the swirl uscany of the blades as parts of a conical surface, obtained, for example, by cutting the surface of a truncated cone by a plane passing through its longitudinal axis, which is offset parallel to the axis of the cone and connected, for example, bushings, characterized in that the offset is simultaneously executed on the radii of the cross-section of the original cone relative to the first section of each part in the reference, for example, clockwise, the number of blades is chosen equal to n, where n is 3, and the amount of displacement of the blades is selected from the condition Sy= (0,05 - 0,5) Saboutwhere Sy- the area of the gaps between the blades, Sabout- area of a larger Foundation of the original cone, the ratio of the values of the radius R of the larger base and the height H of the cone is selected from the condition R = (0,05 - 0,5)H.

 

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The burner // 2044221

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SUBSTANCE: burner (4) for gas burner includes: swirler (21), plate (58), the first channel (18) via which fuel gas with low calorific value is supplied, and second channel (17) via which combustion air is supplied. The first and the second channels (17, 18) are located concentrically relative to longitudinal axis (2). Output of the first channel (18) is formed with convergent nozzle (50). Swirler (21) is installed at the outlet of the second channel (17). Plate (58) is tightly installed in the first channel (18) upstream nozzle (50) and has many holes (56) with calibrated section of the passage. Holes (56) are inclined in tangential direction relative to longitudinal axis (2) at the specified angle. For fuel gases having flame propagation speed of less than 300 mm/s, plate (58) has 36 to 38 holes (56) the diameter of which is 11.5 to 12.0 mm, and inclination angle of holes (56) is approximately 22°. For fuel gases having flame propagation speed of 300 mm/s to 400 mm/s, plate (58) has 80 holes (56) the diameter of which is 8.5 mm to 9.0 mm, and inclination angle of holes (56) is 17° to 22°. If calorific value of gas with low calorific value from the first channel (18) is less than 4.0 MJ/kg, then natural gas consumption is assumed from pilot line (46). Burner (5) is used only when gases with low calorific value are not available.

EFFECT: high burner flexibility; operation is possible at the gas used with low calorific value and of any type within the whole working range of gas turbine.

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FIELD: power engineering.

SUBSTANCE: method to control flow of pilot fuel and flow of main fuel in separate fuel supply into a gas turbine combustion chamber in case of load drop. Speed of changing demand for fuel is monitored, and additional flow of pilot fuel is added, amount of which depends on speed of changing demand for fuel flow. Additional flow of pilot fuel is reduced to zero after load drop. Pilot fuel flow is restricted, when the quantity of additional separation drops to zero. Additional flow of pilot fuel is added, when speed of changing demand for fuel flow exceeds this negative value. Additional flow of pilot fuel is subtracted from the main fuel flow.

EFFECT: invention makes it possible to reduce level of CO and NOx emissions.

6 cl, 1 dwg

FIELD: power industry.

SUBSTANCE: housing of burner for burner device on kitchen gas appliance includes central part comprising gas inlet hole through which gas flows; multiple beam elements spread radially outwards from central part; the first part proximate to central part and including the first location of holes of side wall, which include the first set of slots located on side wall of the burner housing and passing downwards from upper surface of side wall to the first depth; the second part distal from central part and located along the first beam projection and including the second location of holes of side wall, which include the second set of slots located on side wall of the burner housing and passing downwards from upper surface of side wall to the second depth which is more than the first depth; and the third part located between the first and the second parts and along the first beam projection, which includes the third location of holes of the side wall, which include the third set of slots located on side wall of the burner housing and passing downwards from upper surface of side wall to the first depth and the second depth. The first set of slots having the first depth includes an open upper end which forms the part of upper surface of the burner housing. Slots with the first depth and with the second depth of the third set of slots are located alternatively. The second location of holes of side wall also includes multiple fully restricted holes of side wall. Fully restricted holes of side wall are vertically aligned with each of the slots of the second set of slots and are located under each of slots of the second set of slots. The third location of holes of side wall includes the only fully restricted hole of side wall, which is vertically aligned with each slot having the second depth, the third set of slots and located under each slot having the second depth, of the third set of slots.

EFFECT: invention allows flame stability.

28 cl, 6 dwg

Burner // 2459146

FIELD: power industry.

SUBSTANCE: burner with burner head includes mixing tube (3) for pre-mixing of air and fuel; at that, pilot burner system is provided in lower part of mixing tube (3); besides, pilot burner system includes annular mixing cavity (10) with inlet for auxiliary air and for fuel for pilot burner and with outlet nozzles (7), mixing cavity (10) is equipped at least with two swirling blades (18) located near each outlet nozzle (7). Swirling blades (18) at least almost fully cutout the height of mixing cavity (10) relative to axial direction of outlet nozzles (7). Swirling blades (18) are located as pairs of swirling blades (18). One swirling blade (18) of pair of swirling blades (18) is located on outer part, and the second swirling blade (18) is located on inner part of mixing cavity (10) if to see in radial burner direction. Swirling blades (18) are fully integrated with tip (1) of burner. Burner head includes tip (1), intermediate ring (2) and mixing tube (3), which are assembled with each other in order to form the burner head. In circumferential direction of intermediate ring (2) there located are air inlet holes (15) connected to air channels (14). On outlet end of each air channel (14) there located is one or more reflecting holes (16) and reflecting holes (16) open to mixing cavity (10). Outlet nozzle (7) has round or conical or elliptical cross section.

EFFECT: invention allows preventing the flame propagation against the flow direction.

12 cl, 6 dwg

FIELD: heating.

SUBSTANCE: recuperative gas burner includes housing, combustion chamber coaxially located in it, gas chamber with multijet gas nozzle and ignition device, air chamber located in annular space between combustion chamber and housing; at that, combustion chamber is provided with cylindrical and slot holes uniformly located along the perimetre; air supply branch pipe is located on the housing on gas chamber side; at that, gas burner includes cylindrical shell fixed in housing dividing the air chamber into external and internal annular air chambers interconnected between each other on the side of outlet nozzle; combustion chamber is equipped with longitudinal ribs uniformly located along the perimetre; housing is provided with heat insulation. At operation of the burner, first, air is supplied through external annular air chamber located between heat-insulated housing and cylindrical shell in the direction from gas chamber to outlet nozzle, where it is heated from annular shell and heat-insulated housing; then, in opposite direction, through internal annular air chamber located between annular shell and combustion chamber, where it is heated further from cylindrical shell, combustion chamber and longitudinal ribs, and after that, through cylindrical and slot holes to combustion chamber.

EFFECT: increasing combustion efficiency of gaseous fuel by means of additional heating in it of air and inner recuperation of heat.

4 cl, 1 dwg

FIELD: power industry.

SUBSTANCE: cover plate of a gas ring for a kitchen stove includes an upper side and a lower side; at that, lower side of the cover plate faces the corresponding housing of the gas ring; and at least one flame stabilisation chamber located on lower side of the cover plate, and an annular wall for providing insulation of the flame stabilisation chamber against pressure surges when the cover plate of the gas ring is connected to the corresponding housing of the gas ring. In addition, the cover plate of the gas ring includes at least two flame stabilisation chambers. At least one flame stabilisation chamber is located approximately in the middle between periphery and centre of the gas ring cover plate. The gas ring cover plate also includes at least one reference section to facilitate insulation of the flame stabilisation chamber against pressure surges when the gas ring cover plate is connected to the corresponding housing of the gas ring. At least one flame stabilisation chamber has a flattened cylindrical shape. At least one flame stabilisation chamber has a U-shape. At least one flame stabilisation chamber has a square cross section.

EFFECT: invention allows providing flame stability of gas rings.

20 cl, 9 dwg

FIELD: power industry.

SUBSTANCE: several burners are installed on the boiler external wall in one or several rows throughout the furnace height or in its corners. An igniter and a pilot burner are arranged in the housing of each burner. Pilot burner is intended for ignition and monitoring of availability of the main burner flame. Air and gas is supplied to the pilot burner at constant pressure. Flame of each pilot burner is monitored using the method that excludes the influence of flames of other working burners, for example with an ionisation sensor. Availability of the main flame of each burner is guaranteed with availability of flame of its constantly operating pilot burner. Automatic gas equipment units are installed before burners, and their control is performed by means of a burner control cabinet.

EFFECT: invention allows creating a reliable method excluding false information on availability of flame on that burner at its loss.

1 cl, 1 dwg

FIELD: power engineering.

SUBSTANCE: supersonic plasma-chemical combustion-stabilisation device for a forward-flow combustion chamber, comprises two electrodes installed in the flow path of the combustion chamber that are serially arranged along the flow and made in the form of streamlined pylons with symmetrical aerofoil sections, one of which is an anode, electrically isolated from the metal wall of the combustion chamber and equipped with a tube to supply fuel and injectors for injection of fuel into the flow. At the same time the anode is bent so that the root part of the anode has negative sweep relative to the flow direction, and the end one - zero sweep, and the second electrode - cathode is arranged in the trace following the first one and is directly fixed on the wall of the combustion chamber, in the anode there is additionally a tube and injectors for injection of chemically active additives into the flow simultaneously with the fuel, the end of the root part of the anode at the side of the forward flow has a ledge in the form of a thin rectangular plate arranged in the plane of symmetry of the pylon, the rear edge of the plate is bevelled and has fillets in the corner points. At the same time the angle between the end surface and the rear edge of the anode is also rounded. Besides, on the rear edge of the end part of the anode in the zone of formation of the lower pressure zone there may be a cog arranged, for instance, of triangular or other shape, to ensure linkage of the discharge channel to it.

EFFECT: invention makes it possible to provide for reliable ignition and stabilisation of combustion of hydrocarbon fuels in forward-flow supersonic combustion chambers in conditions, when traditional gas dynamic methods do not allow to do so.

2 cl, 2 dwg

FIELD: power industry.

SUBSTANCE: invention relates to the field of power engineering. An ignition and operation method of burners at gasification of carbon-containing fuel types using at least two gasification burners consists in the fact that one of the gasification burners is made in the form of a start-up burner, for ignition of which at least one pilot burner is used, which is ignited by means of an electrical ignition element; with that, by means of the pilot burner in the start-up burner there ignited is a mixture of combustible gas and oxygen-containing gas; with that, after the start-up burner is ignited, at least one other gasification burner is ignited from it, and the start-up burner is operated further due to change of the medium as one of gasification burners of carbon-containing fuel.

EFFECT: invention allows preventing continuous consumption of combustible gas in a pilot or ignition burner.

6 cl, 3 dwg

FIELD: power engineering.

SUBSTANCE: device to stabilise pressure and speed of a flow in a gas burner, comprises a perforated cylindrical wall (2), which serves as a burning surface, an end wall (3) and an inlet hole (10), through which the gas mixture is introduced into the inner volume of the burner (1), and represents a grid (4a, 4b, 4c), arranged as capable of its installation inside the inlet hole (10) and comprising a central ring (5a, 5b), surrounded with a set of deflector blades (6), at the same time the specified grid is arranged as capable of ensuring free passage of the central part of the gas mixture flow arriving into the burner via the central ring (5a, 5b), while the specified deflector blades (6) develop vortex motion of the peripheral part of the flow arriving into the burner (1) outside the perimeter of the central ring (5a, 5b).

EFFECT: invention makes it possible to ensure stabilisation of pressure and speed of a gas mixture flow.

12 cl, 13 dwg

FIELD: power engineering.

SUBSTANCE: device to burn natural gas comprises a body with gas-dispensing holes perpendicular to an upcoming air flow arranged at the distance S from each other, and grooves-stabilisers of a torch. The body comprises upper and lower parts separated with a rectangular through channel, in the upper and lower parts of the body along with air flow, there are additional profiled recirculation grooves, gas-dispensing holes and additional profiled stabilising-recirculating grooves in the upper part of the body, gas-dispensing holes in the upper and lower parts of the body are arranged as coaxial, with serial alternation in direction perpendicular to the axis of the body, in the upper part of the body ratios of their larger and smaller diametres are d1/d2=2/1, 1/2, 2/1, …, and, accordingly, d1/d2=1/2, 2/1, 1/2, …, in its lower part, at the possible minimum S=4d2 or maximum S=10d2 distances between axes of adjacent gas-dispensing holes.

EFFECT: invention makes it possible to increase efficiency of mixture formation, with provision of complete burning of natural gas and environmental safety of gas burner devices.

4 cl, 2 dwg

FIELD: heating.

SUBSTANCE: door with a built-in burner for a heating unit, which is equipped on its inner side with gas burner (2) and on its outer side with system (5) for supply of flammable gas mixture to the burner. Door (1) is made so that it can be installed in frame (61) of the unit wall and detachably fixed on that frame, differs by the fact that it includes a pair of metal sheets (10, 11) rigidly attached to each other in their circumferential direction (100). Outside sheet (10) is provided in its central zone with inlet hole (102) for injection of the above gas mixture, and inside sheet (11) is provided in its central zone with outlet hole (103) that is coaxial to the above inlet hole (102) and on which burner (2) is fixed. Two sheets (10, 11) are located at some distance from each other, and between them there is the space, inside which baffle plate (3, 3') is fixed. The above baffle plate (3) has the shape of a disc, the diameter of which exceeds the diameter of inlet (102) and outlet (103) holes of the above door, and is installed with its centre on axis (X-X') of those holes and perpendicular to that axis. Baffle plate (3) is made of two parallel sheets (30, 31) located at a short distance from each other and attached to each other in their peripheral direction (300). Baffle plate (3) has such shape and dimensions that the gas mixture flow entering the unit through the above inlet hole (102) deviates to the outside of baffle plate (3), envelopes its peripheral shoulder (300) to the inner side and then flows along its inner side and leaves the above outlet hole (103) and enters burner (2).

EFFECT: design restricts heat losses through the door, allows maintaining its outer side in a cold state, preventing burns and burning gas mixture.

18 cl, 7 dwg

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