Slit bottom burner

 

(57) Abstract:

Usage: in the field of energy, particularly in furnaces of various thermal units combustion kondensatsioonivesi gas mixtures, for example koksodomennoj mixture. The inventive gas holes of the gas distribution pipe is installed flue tube, the axis of which is alternately pointing up and down at an angle of 15oto the horizontal axis of the gas pipe, gas pipe wound in a slit-like nozzle at a distance of not more than 1/2 and not less than 1/3 of the length of the nozzle, while the gas distribution pipe is located with a clearance relative to the side walls of the slit. 3 C.p. f-crystals. 3 Il.

The present invention relates to energy and can be used in furnaces of various thermal units combustion kondensatsioonivesi gas mixtures, for example koksodomennoj mixture.

Known hearth burner with forced air supply, representing a rectangular slit, made of refractory bricks, the lower part of which along the axis of the slit is placed a steel pipe with a one-sided supply of gas and two rows of gas holes light the gas jets at an angle to the incoming fire in the slot to air flow [1]

The main disadvantage of working burners of this design is the high heat of steel gas pipes along the upper generatrix of the radiation from the furnace and forming a gas torch, which leads to warping and corrosion. Near the hot wall inside the pipe is cracking gas, which leads to continuous coking gas holes and reduce the performance of the burner. Coking holes unevenly along the length of the distribution pipe, and this leads to uneven outflow of gas from the holes, and hence the excess air along the slit.

The gas, which moves along the gas distribution pipe with a gradually decreasing to zero speed, heated by hot wall of the pipe and the temperature rises towards the end of the pipe. The amount of gas flowing out of the hole at a certain pressure drop, approximately inversely proportional to the square root of its absolute temperature. Therefore, heating of the gas inside the gas pipe leads to the reduction of gas flow through the flue hole in the end of the pipe. The increase in the gas temperature in the gas pipe burner can be significant for large diametral gas in the beginning it is set not less than 20-25 m/s However, in all cases at the end of the pipe the velocity of the gas in the burner close to zero, and the cooling gas tube current of gas is insufficient.

Known L-shaped bottom-slit gas burner developed Saratov Giproniigaz. In this construction gas distribution pipe ( 40-60mm) is set as if in a niche that protects it from direct radiation glowing arch and to a large extent from the rays of the torch. Due to this arrangement of the burner in an L-shaped slit surface temperature of its gas distribution pipe does not reach high values and is distributed throughout its length more or less evenly, which virtually eliminates the effects of warping and coking gas holes [2]

In this burner the gas flows into the gap through the holes located at the firing part of the burner at an angle of 90ofrom the vertical axis. This gap serves blowing air. The gas streams emerging from the fire holes of the gas distribution pipes are in the air stream are mixed with air and form an air-gas mixture.

Ignition of gas-air mixture occurs in the gap. However, as the experience of the former is dostatochno full mixing in the lower part of the gap junction channel, which leads to the phenomenon of so-called "idle flow" of air when a significant portion of the air passes between the streams of gas and mixes with the gas only in the upper part of the gap junction channel and in the working space of the furnace, which can lead to a significant lengthening of the torch.

Another disadvantage of the L-shaped hearth burners is the need for careful setup and adjustments, as well as consideration of the design and technological purposes of the furnace.

The General lack of hearth burners all existing up to the present time structures is a significant amount of masonry refractory bricks to create a firing slits, and the clutch should be done very carefully and not allowed the slightest deviation from the estimated structural sizes.

Pipe insertion into the furnace for many types of slit burners baked you want to punch the holes.

Known slotted bottom burners are designed to burn natural gas. They were well established in the furnaces of the boilers DQC and DKVR. They had spread and some drying systems.

However, the operation of such burners containing vodoes high velocity flame spread (10 times more than in methane-air mixtures) may lead to leakage of flame in the depths of the gap junction channel, overheating of gas distribution pipes. To avoid this phenomenon, forced to reduce the limits of regulation of the burner performance.

In addition, the presence of coke oven gas or its mixtures with other gases, moisture causes condensation in the cavity of a steel gas pipe, which will cause corrosion and, hence, will reduce the service life and the presence of such impurities, as a pair of naphthalene, tar, dust particles can lead to blockage of the holes in the distribution pipe and a significant reduction of flow sections and in the distribution pipe having a small diameter (40-60 mm).

The purpose of the invention improving the reliability and extending the limits of regulation of the burner by burning a hydrogen-containing fuel, which is coke oven gas or its mixture with other, for example, Loxodonta mixture.

This objective is achieved in that the burner housing which is a metal box confusional form for the supply of air passing into the narrow spot is rotated 90oin pramoddrabble, disposable longitudinally along the Central axis and at an angle of 15oup and down relative to its staggered between each other, and to the gas pipe in its Central part is perpendicularly connected to the gas supply manifold located in the same horizontal plane with her and ending with a gas-feeding nozzle outside the housing of the burner.

Gas distribution pipe in a slit-like nozzle is located on the entire width with the same gap between the lower and upper horizontal walls and with a slight clearance relative to the end walls it, and the deepening of the gas distribution pipe in the nozzle of the burner on Wednesdays output ends of the flue tubes is not more than 1/2 and not less than 1/3 of the length of the nozzle.

Below the entire length to the gas pipe is welded to the groove, which serves to collect the condensate and its subsequent removal of the accumulation through the drain pipe with a valve on the outside of the housing of the burner. To drain the condensate in the chute bottom forming gas distribution pipe along its entire length drilled a few holes, the groove is made with a slight slope toward the drain condensate.

Front slit nozzle horel.

The rear end wall of the housing of the burner, which is confused forming vozduhoprovodyaschih boxes made removable.

The proposed bottom slit burner is easy to manufacture due to welded construction. Its installation does not require much labour. If necessary, replace the gas pipe is not necessary to dismantle the entire burner, you can take the back end wall.

The author is not known technical solutions, which have characteristics similar to the features distinguishing the claimed technical solution to the prototype.

In Fig. 1 shows the proposed burner in axonometry, Fig. 2 - section a-a in Fig. 1, in Fig. 3 cross-section B-B in Fig. 2.

The burner includes a housing consisting of a confused metal boxes 1 for the supply through the pipe 2 from above. In the lower part at right angles to the duct 1 is welded to a rectangular slit-like nozzle 3. The width of the nozzle 3 with a hollow inside on the value of 1/2-1/3 its length is naturally pipe 4 with a number of longitudinal holes 5 along its Central axis, in which welded the gas tube 6, 7, angled 15oup from the horizontal axis (Ref. 6) and at an angle of 15ovniuersitie gas distribution pipe connected to the gas supplying manifold 8, which ends in a gas-feeding pipe 9 outside vozduhoprovodyaschih box 1. From the bottom to the gas pipe 4 on its entire length with a small bias one end welded to the chute 10. On the bottom forming gas distribution pipe 4 are arranged through holes 11. For communication with the chute 10 gas distribution pipe 4 has a bottom forming a number of through holes 11.

By means of two bearings 12 and a support 13 node from the gas supplying manifold 8 and the gas distribution pipe 4 with the groove 10 is set in the horizontal plane so that the Central axis of the gas distribution pipe 4 coincides with the axis of the slotted nozzle 3.

For the periodic removal of accumulated condensate from the trough 10 in its lower end point provided for the drain pipe 14 and the valve 15 underside of the burner.

The proposed hearth burner is installed in the lower part of the end wall of the furnace in place of its contiguity to the hearth (see Fig. 2). Slit nozzle 3 in a recess laying of compacted asbestos Board 16 around the perimeter. On the hearth of the furnace in front of the nozzle 3 to the width laid out a number of fireclay bricks 17 on the edge with a gap in one brick between them (See. Fig. 2,3).

Rear Soi cover 18. The adjunction to the burner housing is welded on the ends of confused boxes 1 area 19, is connected by means of bolts (Fig. 2 is not shown) installed in the through hole 20 drilled in adjacent shelves corners 19 and limb cover 18. The connection is sealed paronit spacers 21.

As indicated above, the present invention can be used in furnaces of various thermal plants by burning gaseous fuel containing condensate. In this regard, and consider the operation of such burners, slit-like nozzle which is located in the recess, forming a hearth and end walls and the side walls of the furnace and used as fuel, for example, a mixture of coke oven and blast furnace gases (CDG).

Through the pipe 9 and the gas supplying manifold 8 CDG is served in the gas distribution pipe 4. Through the pipe 2 in computereasy box 1 above served blowing air. He then enters the horizontal slit nozzle 3 of the burner. Of the gas distribution pipe 4 through the flue tubes 6, 7, angled 15oto the horizontal axis of the gas distribution pipe 4 up and down in a staggered manner and form between the Azora between the outer surface of the gas distribution pipe 4 and the inner surface of the walls of the nozzle 3. The resulting gas-air mixture is ignited at the outlet of the burner nozzle 3.

In the gas distribution pipe 4 emitted from CDG condensate settles in its lower part, where through the through holes 11 on the bottom of the pipe it flows into the chute 10 from the bottom of the gas distribution pipe. When a sufficient accumulation of condensate through the drain pipe 14 is periodically removed through a shut-off valve 15.

The burner nozzle is both a mixer by burying him in distribution pipes. Considering I leaned out the gas tube, the mixing zone in a slit-like nozzle is defined within 1/2 to 1/3 the length of the nozzle. If the mixing zone more than 1/2 the length of the nozzle, it increases the likelihood of leakage of the flame inside the burner nozzle, which will cause the need to reduce the range of regulation. If the mixing zone less than 1/3 the length of the nozzle, the mixing of gas with air shifted outside of the outlet cross section of the nozzle, and when a sufficient negative pressure in the combustion chamber may be a separation of the torch.

Arriving at the combustion blower air forms in the gap between the surface of the gas distribution pipe and the walls of the burner nozzle turbulizing air pot is passed from the flue tubes. All this improves the conditions for mixing air and gas, intensifies the process of mixing.

The presence of the stabilizing device from a number of fireclay bricks laid on edge with a clearance between them in one brick front before the burner nozzle throughout its width, promotes sustainable combustion generated torch, ensures reliable ignition of the gas mixture in the event of a possible detachment of the flame from the burner nozzle.

Due to the fact that the back wall of the burner is designed as a removable cover, much easier and easier repair if necessary replace gas pipe, because there is no need to dismantle the entire burner.

Following are the main design parameters and the mass of the prototype slit bottom burners (a specific example of implementation of the declared burner).

the diameter gazobetona Hm

the diameter vozduhootvod Hm

the diameter of the gas supply manifold h mm

the diameter of the gas pipe h mm

the length of the gas distribution pipe 2400 mm

the diameter and the number of gas holes 19mm, 40 pcs.

the step between 60 mm

the diameter of the flue tubes h,0 cutting angle 15odown 20 pcs.

the length of the flue tubes 50 mm

the dimensions of the burner nozzle in cross section 2500-200 mm

the working length of the nozzle (closed up in the clutch) 350 mm

the depth distribution pipe in the nozzle of the burner on Wednesdays flue pipes 150 mm

the total area of the output sections for gas 60 cm2< / BR>
same for air 1020 m2< / BR>
the area of the outlet cross section of the burner nozzle 4730 cm

the cross-sectional area vozduhootvod 760 cm2< / BR>
same, gazobetona 130 cm2< / BR>
the dimensions of the burner HH mm

weight burner 164 kgs

1. Slit bottom burner containing vozduhoprovodyaschih housing with a slit-like nozzle outlet, the nozzle for supplying air and gas gas distribution pipe with gas holes spaced evenly along in one row along the specified pipe, gas pipe installed in a slit-like nozzle throughout its width, with the same gap between the lower and upper horizontal walls, characterized in that the gas holes of the gas distribution pipe is installed flue tube, the axis of which is alternately pointing up and down at an angle of 15oto guesstania not more and not less than 1/2 to 1/3 the length of the nozzle, when this gas pipe is located with clearance relative to the side walls of the slit.

2. Burner under item 1, characterized in that it is provided with a groove mounted under the gas distribution pipe along its entire length with a slight slope toward the drain of the condensate, while along the gas distribution pipes, in its lower part, made several through holes, and the chute is equipped with a drain pipe with a valve on the outside of the body.

3. Burner on PP.1 and 2, characterized in that it is equipped with a stabilizing device arranged in front of a slit nozzle, and represents a row of bricks set on edge between the flue tubes.

4. Burner on PP.1 to 3, characterized in that the rear wall of the body is beveled and removable.

 

Same patents:

Burner // 2029194
The invention relates to heat engineering, in particular to equipment for the combustion of gaseous fuels

The invention relates to the design block injection burners for equipment of gas-fired furnaces hot water and steam boilers, which are used primarily in heating systems of residential, public and industrial buildings

FIELD: power engineering.

SUBSTANCE: method comprises injecting at least one type of fuel and at least one oxidizer. The primary oxidizer is injected together with the fuel to generate first incomplete burning. The gases emitting from the first burning comprises at least a part of the fuel, whereas the secondary oxidizer is injected downstream of the site of the fuel injection at a distance larger than that between the fuel injection and primary oxidizer closest to the fuel injection so that to be burnt out together with the fuel part. The flow of the first oxidizer is branched into at lest two primary flows.

EFFECT: reduced emission of nitrogen oxides.

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FIELD: the invention refers to the technology of using a cumulative jet.

SUBSTANCE: the mode of formation of at least one cumulative jet includes feeding of at least one gas jet out of at least one nozzle with a converging/diverging configuration located in an injector having a face surface of the injector. At that the face surface of the injector has openings located along the circumference around at least one nozzle, moreover the indicated at least one gas jet has a supersonic speed when it is formed at the output from the face surface of the injector and remains supersonic on a distance coming to at least 20d, where d- the diameter of the output opening of the indicated at least one nozzle. Feeding of fuel from the first group of openings located along the circumference and feeding of an oxidizing agent from the second group of openings located along the circumference. Incineration of fuel and the oxidizing agent fed from the first and the second groups of openings located along the mentioned circumference for formation of a flame shell around at least one gas jet. A great number of gas jets are fed from the injector. The fuel and the oxidizing agents are fed from the first group of openings and from the second group of openings correspondingly alternate with each other on the circumference along which they are located. At least one gas jet, the fuel and the oxidizing agent are fed from the injector directly into the space for injection without passing the zone of recycling formed with the extender of the injector. At least one gas jet passes at a prescribed distance coming at least to 20d, where d- is the diameter of the output opening of the nozzle from which exits a gas jet keeping the diameter of the mentioned gas jet in essence constant.

EFFECT: the invention allows make an arrangement with the aid of which it is possible to form effective cumulative gas jets without need in an extender in the injector or in any other element for forming recycling zone for gases fed from the injector.

9 cl, 3 dwg

FIELD: power engineering.

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EFFECT: fuel combustion using oxygen as oxidant suitable for retrieving energy from furnace gases.

8 cl

FIELD: heating.

SUBSTANCE: invention relates to power engineering. The proposed method of fuel firing with oxygen-containing gas wherein fuel jet is injected and, at least, two jets of oxygen containing gas that features high oxygen content. Note here that the 1st jet of aforesaid gas, called a primary jet, is injected to allow its contact with the fuel jet and to form the 1st incomplete firing. Note here that outlet gases, thereafter, contains, nevertheless, at least, one fraction of fuel. Note also that the 2nd aforesaid jet is injected at the distance from the fuel jet to allow firing together with the said 1st fuel fraction existing in outlet gases after 1st firing. The oxidiser primary jet is divided into two primary jets, that is, 1st primary jet, called the central primary oxidiser jet injected into fuel jet centre and 2nd primary jet called the embracing primary jet injected coaxially and around the fuel jet. The rate of the oxidiser central primary jet injection exceeds that of fuel jet injection. The fuel jet injection rate exceeds that of the 1st embracing oxidizer injection. The oxidiser 2nd jet injection rate exceeds that of the oxidiser embracing primary jet. The distance between the oxidiser central primary jet injection and its 2nd jet injection vs the rate of injection of the oxidiser 2nd jet varies between 10-3 and 10-2. The oxidiser 3rd jet is injected at the point located between the point of injecting the oxidiser central primary jet and that of injecting 2nd oxidising jet. The rate of injecting oxidiser 2nd jet exceeds that injecting oxidiser 3rd jet. The distance between the point of injecting oxidiser 2nd jet and that of injecting oxidiser central primary jet vs the distance between the point of injecting oxidiser 3rd jet and that of injecting oxidiser primary jet varies from 2 to 10. Two primary oxidiser jets feature identical oxygen concentration. The oxidizer central primary jet oxygen concentration exceeds that of oxidiser embracing primary jet.

EFFECT: higher furnace reliability.

10 cl, 1 dwg

FIELD: heating.

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EFFECT: firing gas with low oxygen content.

25 cl, 1 dwg

FIELD: heating systems.

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FIELD: heating.

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EFFECT: invention allows to regulate primary air supply to the combustion chamber section during equipment operation, burning device design simplification, it operation safety stays constant, possibility of device change on the running gas turbine equipment.

1 dwg

FIELD: heating.

SUBSTANCE: invention relates to fuel combustion process. Fuel combustion method is implemented by means of oxygen-containing gas with high oxygen content, in accordance with which to combustion chamber there sprayed is fuel jet and at least two jets of oxygen-containing gas; at that, the first or primary jet of oxygen-containing gas is supplied through the hole having diametre D and sprayed around the above fuel jet in such quantity which allows providing the first incomplete fuel combustion; at that, gases formed as a result of the above first combustion contain at least some part of unburnt fuel, and the second jet of oxygen-containing gas introduced through the hole having diametre d and located at some distance 1 from the hole of introduction of the first or primary jet of oxygen-containing gas so it can be possible to enter into combustion reaction with the fuel portion which is contained in gases formed as a result of the above first incomplete combustion; at that, fuel jet opens inside the jet of primary oxygen-containing gas at some point located at some distance in backward direction from combustion chamber wall; at that, the above point is located at distance r from that wall, and oxygen-containing gas with high oxygen content is pre-heated at least to 300C. Ratio r/D has the value either lying within the range of 5 to 20, or lying within the range of 0.75 to 3, and ratio 1/d has the value equal at least to 2. Oxygen-containing gas with high oxygen content represents oxygen concentration which is at least 70% by volume. Fuel is subject to pre-heating up to temperature comprising at least 300C.

EFFECT: increasing fuel combustion efficiency.

15 cl, 1 dwg

FIELD: power engineering.

SUBSTANCE: burner for fuel combustion comprises fuel supply line. The fuel supply line consists of several fuel sections. Also each fuel section is connected to another section and is designed for supply of fuel flow. Further, the burner includes a fuel inlet section. This section has the first fuel inlet and the first fuel outlet located at a distance from the first fuel inlet. The fuel inlet section has the first through cross section area and is designed to supply fuel flowing into the first fuel inlet and coming out the first fuel outlet. The burner has an intermediate section of fuel with fuel inlet and outlet device, notably the fuel outlet device is located at a distance from the fuel inlet device. The intermediate fuel section is designed for supply of at least part of flow coming into the inlet fuel device and going out of the outlet fuel device and has the second through cross section area. The second through cross section area changes from the initial through cross section area in the fuel inlet device to different through cross section area in the fuel outlet device. The burner has the fuel outlet section. The fuel outlet section has the second inlet of fuel and the second outlet of fuel located at a distance form the second inlet of fuel. The fuel outlet section is designed for supply of at least part of fuel flow coming onto the second fuel inlet and going out the second fuel outlet and it has the third through cross section area. This third through cross section area in essence is uniform along the whole outlet section of fuel. The burner comprises the first line of oxidant with several oxidant sections. Each oxidant section is connected to another oxidant section. It is designed to supply flow of oxidant. It includes an oxidant pressure chamber letting though oxidant flow and having the fourth through cross section area. At least part of oxidant pressure chamber is located in essence at least next to a part of at least one inlet section of fuel, intermediate section of fuel and outlet section of fuel. The oxidant outlet section lets through at least part of oxidant flow and has the fifth through cross section area. Also the fifth through cross section area is less or equal to the fourth through cross section area and in essence is uniform along the whole outlet section of oxidant. At least part of oxidant outlet section in essence is positioned next to the fuel outlet section.

EFFECT: facilitating upgraded quality of fuel combustion and reduced level of nitrogen oxide exhaust into atmosphere.

28 cl, 19 dwg

FIELD: chemistry.

SUBSTANCE: invention relates to a method of producing acetylene and synthetic gas via thermal partial oxidation of hydrocarbons which are gaseous at temperatures used for preheating, in a reactor which is fitted with a burner with through holes, characterised by that the starting substances to be converted are quickly and completely mixed only directly in front of the flame reaction zone in through holes of the burner, where in the mixing zone within the through holes the average flow rate is higher than the propagation speed of the flame under the existing reaction conditions. The invention also relates to a device for realising the said method.

EFFECT: possibility of avoiding preliminary and reverse inflammations.

9 cl, 3 ex, 1 dwg

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