Method of staged fuel combustion in oxygen-containing atmosphere by using pre-heated reagents

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

 

The invention relates to a method of combustion using oxygen-containing gas with a high oxygen content, in accordance with which this oxygen-containing gas with a high oxygen content previously subjected to heating to a temperature component of at least 300C.

Currently, two main problems arise when determining the dimensional parameters of burners designed for industrial furnaces, associated with the efficiency of transmission of heat to the furnace and the reduction of pollutant emissions, in particular nitrogen oxides. One of the most promising solutions to these two problems is stepped combustion in oxygen-containing atmosphere using a preheated reagents. Indeed, it is known that gradual combustion reduces emissions of pollutants with the General chemical formula NOx, and that pre-heating of the reactants allows to realize a gain in energy.

Combustion in oxygen-containing atmosphere is the combustion using oxygen-rich gas having an oxygen concentration greater than its concentration in the air. Method of stepped combustion consists in dividing the amount of oxidant required to lead the combustion of the fuel, on at least two of the stream of the oxidant injected at various distances from the stream of combusted fuel. Thus, the first flow of oxidant is injected at a very short distance from the fuel flow. This first flow of oxidant closest to the fuel flow, called primary flow. It allows for partial combustion of the fuel at a controlled temperature, which makes it possible to limit the formation of substances with the General formula NOx. Other threads oxidant are injected at slightly greater distance from the fuel flow than the primary flow of the oxidizer. These streams of oxidizer to allow complete combustion, without having a reaction with the primary oxidant stream. These flows of oxidant called secondary flows.

Pre-heating of the reactants (oxygen-containing gas and fuel) has already been proposed various schemes for the recovery of thermal energy of the flue gas (patent US 6071116). Also in the patent WO 0079182 was described burner with injection of preheated fuel and oxidant. However, these patents do not mention the existence of problems associated with the use of hot chemicals. However, the use of these hot reagents may cause the following adverse effects:

- increasing the speed of the flame is burning, see the si reagents. When the flame front is stabilized near the output sections of the various holes of the burners, which increases the risk of heating and premature destruction of the injectors;

- increase flame temperature, which increases the radiation heat transfer to the furnace and to the surface of the burner;

- increasing levels of thermal selection of chemical compounds with the General formula NOx due to the increase in flame temperature.

The technical problem of this invention is to choose the rules for determining the dimensional parameters for the burner, using stepped combustion in oxygen-containing atmosphere and preheated reagents, in order to preserve the benefits of staged combustion of fuel in an oxygen-containing atmosphere without being subjected to the hazards associated with using the pre-heated reactants.

To solve this technical problem, a method of combustion using oxygen-containing gas with a high oxygen content, in accordance with which the combustion chamber inject:

- jet fuel

and at least two jets of oxygen-containing gas, namely:

* first or so-called primary stream of oxygen-containing gas which is introduced through the hole, having a diameter D, and vpryskivat is camping around the jet fuel in such quantities, enabling the first incomplete combustion and the gases resulting from this first combustion, contain at least some portion of unburned fuel,

* and the second stream of oxygen-containing gas which is introduced through the hole, having a diameter d and is placed at a distance l from the opening introduction of the first or primary stream of oxygen-containing gas, so that she could enter into combustion with the part of unburned fuel, which is present in the gases formed in the first combustion

and in accordance with which:

- jet fuel opens inside the jet of primary oxygen-containing gas at some point, spaced backward from the wall of the combustion chamber, and said point is located at a distance r from the wall,

- oxygen-containing gas with a high content of oxygen is preheated to the temperature component of at least 300C, while

the ratio r/D has a value:

* or in the range from 5 to 20, and preferably in the range from 7 to 15,

* or in the range from 0.75 to 3,

and the ratio l/d is the amount of at least 2, and preferably component of at least 10.

In the method in accordance with featur the subject invention is burning, wherein the oxidant is an oxygen-containing gas with a high oxygen content, i.e. gas, a concentration of oxygen higher than in the air: here we can talk about the air enriched with oxygen or pure oxygen. Preferred, the concentration of oxygen in oxygen-containing gas is at least 70% by volume.

In the method in accordance with the proposed invention uses a combustion, in which at least oxygen-containing gas is pre-heated to a temperature component of at least 300C. This pre-heating can be carried out by any known the current level of technology and appropriate in this case, by the way. It is preferable to use pre-heated by the regenerator, allowing you to use thermal energy of the flue gases of combustion. Fuel can also be pre-heated, preferably to a temperature component of at least 300C.

In the method in accordance with the proposed invention uses stage combustion in which the oxygen-containing gas is divided into two streams that are injected into the combustion chamber at different distances from the jet fuel. The primary jet upomjanutogo is put into contact with jet fuel and surrounds the spray. Hole injector, providing for the introduction of primary stream of gas into the combustion chamber, has a diameter D. the End of this injector introducing a primary gas jet opens directly into the combustion chamber. However, the end of the injector fuel supply does not open directly into the combustion chamber, but is located with some deviation in the backward direction from the wall of the combustion chamber, that is the end of the fuel injector is opened inside and in the middle of the primary injector jets of oxygen-containing gas at a point spaced backward from the wall of the combustion chamber and located at a distance r from the said wall. The diameter of the injector fuel supply is usually defined in such a way as to form a stable flame. Usually do from 2 to 20% of the total number of oxygen-containing gas required for the combustion of fuel by the primary stream of this gas. The additional amount of oxygen-containing gas is introduced through the secondary stream using the injector, the end of which opens directly into the combustion chamber and an outlet opening which has a diameter d. This secondary injector jets of oxygen-containing gas is placed at a distance l from the exit of the jet of the primary oxygen-containing gas, and the distance l is measured between the closest the Rog other edges of the outlet openings of the primary injector jets of oxygen-containing gas and injector secondary stream of oxygen-containing gas.

It is preferable to exclude using staged combustion of fuel in an oxygen-containing atmosphere diverting in the direction of the back of the injector injecting the fuel inside the injector of the injection jet of the primary oxygen-containing gas such determination of dimensional parameters, in which the ratio r/D would be made in the range from 3 to 5. Determination of dimensional parameters, respectively, r and D, is critical, since these parameters affect the volume of the cavity created by the abstraction ago fuel injector inside the injector primary stream of oxygen-containing gas. By choosing the optimal values mentioned dimensional parameters of the proposed invention allows, on the one hand, to prevent the premixed flame propagation in the cavity, caused damage to the ends of the fuel injectors and injectors primary jets of oxygen-containing gas, and on the other hand, allows to prevent heat radiation from the combustion chamber, leading to damage to the end of the fuel injector.

It is preferable that the ratio l/d was the amount of at least 2, and preferably component of at least 10.

Usually the holes through which the injected reagents, etc is astavliaut a circular cross-section. However, the invention also covers the case where the cross-section of these holes has a shape that is different from all. In these cases, the above-mentioned diameters d and d correspond to the hydraulic diameters of the mentioned cross-sections that are not round, and that the hydraulic diameter is defined as the ratio of four times the magnitude of the surface area of the mentioned cross-sectional size of the perimeter of the cross section of the hole.

The drawing is a diagram, which illustrates the various elements of the definition of dimensional parameters for implementing the method in accordance with the invention (r, d, D, l). Fuel 1 is introduced through the injector 7 placed inside the injector 6 of the supply of the primary oxygen-containing gas 2. The end of the injector fuel supply is located at a distance r in the direction of the back wall 4 of the combustion chamber. The end of the injector 6 of the supply of the primary oxygen-containing gas 2 has a diameter D. the Secondary oxygen-containing gas 3 is introduced through the injector 5, the end of which has a diameter d. The distance between the edges of the ends of the injectors 5 and 6 of the oxygen-containing feed gas has a value of l.

When using the above method it is possible to apply pre-heating of real now, participating in the burning of fuel in the process staged combustion of fuel in oxygen-containing atmosphere without danger of premature destruction of injectors for supplying reagents and without increasing emissions of substances with the General formula NOx.

1. A method of burning fuel by using oxygen-containing gas with a high oxygen content, in accordance with which the combustion chamber inject a stream of fuel and at least two jets of oxygen-containing gas, and the first or primary stream of oxygen-containing gas is introduced through the hole, having a diameter D, and is injected around the aforementioned jet fuel in such quantities, which allows us to provide first incomplete combustion and the gases resulting from this first combustion, contain at least some portion of unburned fuel and the second stream of oxygen-containing gas is introduced through the hole, having a diameter d and is placed at some distance 1 from the hole of the introduction of the first or primary stream of oxygen-containing gas, thereby to react combustion with the fuel, which is present in the gases resulting from the aforementioned first incomplete combustion, while jet fuel is opened inside the jet of primary oxygen-containing gas is certainly the point, spaced backward from the wall of the combustion chamber, and said point is located at a distance r from the wall, and oxygen-containing gas with a high content of oxygen is preheated to the temperature component of at least 300C., characterized in that the ratio r/D has a value, or is in the range from 5 to 20, or in the range from 0.75 to 3, and the ratio 1/d has a value at least equal to 2.

2. The method according to claim 1, characterized in that the ratio r/D is the value contained in the range from 7 to 15.

3. The method according to claim 1, characterized in that the ratio 1/d has a value at least equal to 10.

4. The method according to claim 2, characterized in that the ratio 1/d has a value at least equal to 10.

5. The method according to claim 1, characterized in that the oxygen-containing gas with a high content of oxygen is the oxygen concentration, which is at least 70% by volume.

6. The method according to claim 2, characterized in that the oxygen-containing gas with a high content of oxygen is the oxygen concentration, which is at least 70% by volume.

7. The method according to claim 3, characterized in that the oxygen-containing gas with a high content of oxygen is the oxygen concentration, which is at least 70% by volume.

8. The method according to claim 4, characterized in that the oxygen-containing gas with a high content of oxygen is the oxygen concentration, component of at least 70% by volume.

9. The method according to claim 1, characterized in that the fuel is pre-heated to a temperature component of at least 300C.

10. The method according to claim 2, characterized in that the fuel is pre-heated to a temperature component of at least 300C.

11. The method according to claim 3, characterized in that the fuel is pre-heated to a temperature component of at least 300C.

12. The method according to claim 4, characterized in that the fuel is pre-heated to a temperature component of at least 300C.

13. The method according to claim 5, characterized in that the fuel is pre-heated to a temperature component of at least 300C.

14. The method according to one of claims 1 to 13, characterized in that the method is used in a furnace designed for melting glass.

15. The method according to one of claims 1 to 13, characterized in that the method is used in a furnace designed for re-heating.



 

Same patents:

FIELD: combustion.

SUBSTANCE: device comprises combustion chamber with a layer of fluid in its bottom section, device for supplying fluid, pipeline provided with a nozzle, and device for igniting. The pipeline with a nozzle is mounted inside the fluid gate valve with a splitter mounted above the nozzle and provided with the casing made of a hollow trancated cone and mounted coaxially to the splitter with diffuser directed off the splitter upward. The fluid level in the fluid gate valve of the combustion chamber should be no lower than that of the top edges of the splitter casing.

EFFECT: enhanced safety.

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FIELD: heating.

SUBSTANCE: invention related to energy, particularly to burner devices and can be used in gas turbine equipment. Burner device consists of a case (1), a fuel nozzle (2), a front device (3), a fire tube (4). The burner device belongs to gas-turbine engine combustion chamber. The front device executed with holes for fuel nozzles installation (2). The fire tube (4) with the front device (3) located inside of the combustion chamber cage (5). Fuel nozzles (2) connected to a gas ring collector (6). In combustion chamber fire tube and cage (5) between wall area air nozzles (7) located radically. Air nozzles (7) connected to the common ring air collector (9). The air collector (9) located in the case (1).

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1 dwg

FIELD: heating systems.

SUBSTANCE: invention refers to gas burners with separate air and gaseous fuel supply. The effect is achieved in gas burner (1) containing main metal housing (6), an inner tube for fuel gas, at least two outer tubes (10) for fuel gas, single tube (8) for supplying pre-heated air, fuel gas supply control system, refractory block (30) and a group of nozzles (20) which are located in a circumferential direction coaxially in relation to inner tube and meant for spraying pre-heated air into combustion chamber.

EFFECT: limit reduction of NOx concentration in exit combustion products.

29 cl,13 dwg

FIELD: heating.

SUBSTANCE: invention relates to powder engineering. The 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 of l1 from the fuel jet to allow firing together with the said 1sr fuel fraction existing in outlet gases after 1st firing. Oxygen containing gas with low oxygen content is injected at the distance l2 from the fuel jet providing the firing together with the said outlet gases after 1st firing, where l2>l1.

EFFECT: firing gas with low oxygen content.

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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: power engineering.

SUBSTANCE: method of fuel combustion when at least one fuel and at least two oxidants are injected: the first oxidant is injected at I1 distance equal to 20 cm at maximum and preferably 15 cm at maximum from point of fuel injection. The second oxidant is injected at I2 distance from point of fuel injection while I2 is greater than I1. Oxidants are injected in such amounts that sum of their amounts is equal to at least stoichiometric amount of oxidant required to provide combustion of injected fuel. The first oxidant is oxygen-enriched air at maximum temperature of 200 C, and the second oxidant is air preheated to temperature of at least 300 C. Air is enriched with oxygen so that oxygen concentration in enriched air is at least 30%. Oxygen-enriched air is obtained by mixing ambient air with oxygen from cryogenic source. Preheated air is heated by means of heat exchange using part of hot combustion products. At least two oxidants are injected at I1 distance equal to 20 cm at maximum and preferably 15 cm at maximum while one oxidant called primary is injected mixed with fuel or near fuel and another oxidant called secondary is injected at distance from fuel. Amount of oxidant injected by means of primary oxidant jet ranges from 2 to 50% of oxygen stoichiometric amount required to provide combustion of injected fuel. The secondary oxidant is separated into multiple jets of secondary oxidant. The second oxidant injected at distance I2 is separated into multiple jets of oxidant.

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

8 cl

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.

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.

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Gas burner // 2213300
The invention relates to a power system, can be used in stoves for burning gaseous fuel and improves the reliability and durability of the burner, to exclude the output of the fuel outside the torch

Hearth burner // 2211403
The invention relates to bottom (horizontal slot) single tube burners with forced air for combustion of gaseous fuel and can be used in heating sectional boilers, Asilah, etc

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.

40 cl, 8 dwg

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.

SUBSTANCE: method of fuel combustion when at least one fuel and at least two oxidants are injected: the first oxidant is injected at I1 distance equal to 20 cm at maximum and preferably 15 cm at maximum from point of fuel injection. The second oxidant is injected at I2 distance from point of fuel injection while I2 is greater than I1. Oxidants are injected in such amounts that sum of their amounts is equal to at least stoichiometric amount of oxidant required to provide combustion of injected fuel. The first oxidant is oxygen-enriched air at maximum temperature of 200 C, and the second oxidant is air preheated to temperature of at least 300 C. Air is enriched with oxygen so that oxygen concentration in enriched air is at least 30%. Oxygen-enriched air is obtained by mixing ambient air with oxygen from cryogenic source. Preheated air is heated by means of heat exchange using part of hot combustion products. At least two oxidants are injected at I1 distance equal to 20 cm at maximum and preferably 15 cm at maximum while one oxidant called primary is injected mixed with fuel or near fuel and another oxidant called secondary is injected at distance from fuel. Amount of oxidant injected by means of primary oxidant jet ranges from 2 to 50% of oxygen stoichiometric amount required to provide combustion of injected fuel. The secondary oxidant is separated into multiple jets of secondary oxidant. The second oxidant injected at distance I2 is separated into multiple jets of oxidant.

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.

SUBSTANCE: invention relates to powder engineering. The 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 of l1 from the fuel jet to allow firing together with the said 1sr fuel fraction existing in outlet gases after 1st firing. Oxygen containing gas with low oxygen content is injected at the distance l2 from the fuel jet providing the firing together with the said outlet gases after 1st firing, where l2>l1.

EFFECT: firing gas with low oxygen content.

25 cl, 1 dwg

FIELD: heating systems.

SUBSTANCE: invention refers to gas burners with separate air and gaseous fuel supply. The effect is achieved in gas burner (1) containing main metal housing (6), an inner tube for fuel gas, at least two outer tubes (10) for fuel gas, single tube (8) for supplying pre-heated air, fuel gas supply control system, refractory block (30) and a group of nozzles (20) which are located in a circumferential direction coaxially in relation to inner tube and meant for spraying pre-heated air into combustion chamber.

EFFECT: limit reduction of NOx concentration in exit combustion products.

29 cl,13 dwg

FIELD: heating.

SUBSTANCE: invention related to energy, particularly to burner devices and can be used in gas turbine equipment. Burner device consists of a case (1), a fuel nozzle (2), a front device (3), a fire tube (4). The burner device belongs to gas-turbine engine combustion chamber. The front device executed with holes for fuel nozzles installation (2). The fire tube (4) with the front device (3) located inside of the combustion chamber cage (5). Fuel nozzles (2) connected to a gas ring collector (6). In combustion chamber fire tube and cage (5) between wall area air nozzles (7) located radically. Air nozzles (7) connected to the common ring air collector (9). The air collector (9) located in the case (1).

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

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