CN211424389U - Gas burner - Google Patents
Gas burner Download PDFInfo
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- CN211424389U CN211424389U CN201922072090.6U CN201922072090U CN211424389U CN 211424389 U CN211424389 U CN 211424389U CN 201922072090 U CN201922072090 U CN 201922072090U CN 211424389 U CN211424389 U CN 211424389U
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Abstract
The utility model discloses a gas burner, which comprises a gas inlet, an air inlet and a stable burning cavity communicated with the gas inlet and the air inlet; the gas inlet is respectively communicated with the inner annular blast furnace gas nozzle and one end of a plurality of outer dispersion type blast furnace gas nozzles; the other ends of the inner annular blast furnace gas nozzle and the plurality of outer dispersed blast furnace gas nozzles are communicated with the stable combustion cavity; the air inlet is respectively communicated with one end of the rotational flow secondary air nozzle, the rotational flow after-burning air nozzle and one end of the central air pipe, and the other ends of the rotational flow secondary air nozzle, the rotational flow after-burning air nozzle and the central air pipe are communicated with the stable burning cavity; the cyclone secondary air nozzle and the cyclone after-combustion air nozzle spray gas in the stable combustion cavity, and the pressure gradient generated by the cyclone is distributed to form a backflow area; and a group of gas guns are arranged in the central air pipe and the reflux area.
Description
Technical Field
The utility model belongs to the technical field of the combustor, concretely relates to gas burner.
Background
The blast furnace gas is reused as a byproduct in the metallurgical industry as a power fuel of a steam boiler, so that the pollution can be reduced, the resources can be saved, and the requirement of the boiler on power coal is reduced. Blast furnace gas with main components of CO and CO2、N2And a small amount of H2、H2O, etc., a calorific value of about 3000KJ/Nm3The combustible components are less, the heat value is low, the flame temperature is not high, the temperature of a boiler hearth is low, the boiler hearth is not easy to catch fire and burn, and the like can occur during burning.
For the combustion of blast furnace gas in China, a double-cyclone burner is often adopted. The end of the burner is provided with a stable combustion swirl vane device, the included angle between a gas side vane and an axis is about 45 degrees, the included angle between an air side vane is about 30 degrees, the swirl direction of a gas side is consistent with that of an air side, and the swirl direction is consistent with that of tangential air in the burner, so that the best combustion effect is achieved. Because of the factors such as impurities in the coal gas, the problem of blockage of the blast furnace coal gas side of the combustor frequently occurs during the running of the boiler combustor, the load capacity of the boiler is further influenced, and even the boiler is forced to be stopped when the blockage is serious.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a gas burner to the aforesaid among the prior art is not enough to solve the problem that combustor blast furnace gas side blockked up.
In order to achieve the purpose, the utility model adopts the technical proposal that:
a gas burner comprises a gas inlet, an air inlet and a stable combustion cavity communicated with the gas inlet and the air inlet;
the gas inlet is respectively communicated with the inner annular blast furnace gas nozzle and one end of a plurality of outer dispersion type blast furnace gas nozzles; the other ends of the inner annular blast furnace gas nozzle and the plurality of outer dispersed blast furnace gas nozzles are communicated with the stable combustion cavity; the air inlet is respectively communicated with one end of the rotational flow secondary air nozzle, the rotational flow after-burning air nozzle and one end of the central air pipe, and the other ends of the rotational flow secondary air nozzle, the rotational flow after-burning air nozzle and the central air pipe are communicated with the stable burning cavity; the cyclone secondary air nozzle and the cyclone after-combustion air nozzle spray gas in the stable combustion cavity, and the pressure gradient generated by the cyclone is distributed to form a backflow area; and a group of gas guns are arranged in the central air pipe and the reflux area.
Preferably, the inner annular blast furnace gas nozzle is arranged at the middle position of the outer distributed blast furnace gas nozzles.
Preferably, the plurality of external dispersion type blast furnace gas nozzles are distributed in an annular shape.
Preferably, a heat accumulator is arranged in the stable combustion cavity.
Preferably, a throat is formed in the combustion stabilizing cavity, and the angle alpha of the throat is 15 degrees.
Preferably, the central air pipe is provided with a flow expansion cone.
The utility model provides a gas burner has following beneficial effect:
the air of the utility model adopts rotational flow, which can make the air move forward and generate radial movement at the same time, so that the low heat value gas and the air are intensively mixed and combusted in the stable combustion chamber; the stable combustion cavity has enough length, so that low-heat value gas and air can be fully combusted in a high-temperature section, and the combustion efficiency is improved; meanwhile, the low-heat value gas is sprayed in by direct current, so that the diffusion of the low-heat value gas to the wind side is slowed down, and the ignition and stable combustion of the low-heat value gas are facilitated; the low heat value gas adopts direct current, the airflow does not rotate, the speed along the radial direction of the pipeline can not be generated, the impurities in the airflow are not easy to adhere to the nozzle, meanwhile, the flow cross section of the nozzle of the low heat value gas is large, and the low heat value gas can be conveniently cleaned when the furnace is shut down even if slight adhesion exists, so that the problem of side blockage of the blast furnace gas of the burner is solved.
Drawings
Fig. 1 is a structural view of a gas burner.
Wherein, 1, a coal gas inlet; 2. an air inlet; 3. a heat accumulator; 4. a flow expansion cone; 5. a central air duct; 6. an inner annular blast furnace gas nozzle; 7. a swirl secondary air nozzle; 8. external dispersion type blast furnace gas nozzles; 9. a swirling flow afterburning air nozzle; 10. and a combustion stabilizing cavity.
Detailed Description
The following description of the embodiments of the present invention is provided to facilitate the understanding of the present invention by those skilled in the art, but it should be understood that the present invention is not limited to the scope of the embodiments, and various changes may be made apparent to those skilled in the art within the spirit and scope of the present invention as defined and defined by the appended claims.
According to an embodiment of the application, referring to fig. 1, the gas burner of the present scheme comprises a gas inlet 1, a wind inlet 2 and a combustion stabilizing cavity 10, wherein the gas inlet 1 and the wind inlet 2 are respectively communicated with the combustion stabilizing cavity 10 and respectively provide gas and air to the combustion stabilizing cavity 10, and the gas and the air are mixed and combusted in the combustion stabilizing cavity 10.
The gas inlet 1 is respectively communicated with one ends of the inner annular blast furnace gas nozzle 6 and the plurality of outer distributed blast furnace gas nozzles 8, and the other ends of the inner annular blast furnace gas nozzle 6 and the plurality of outer distributed blast furnace gas nozzles 8 are communicated with the stable combustion cavity 10 and used for supplying gas into the stable combustion cavity 10.
The number of the external dispersion type blast furnace gas nozzles 8 can be selected according to actual requirements, and a plurality of external dispersion type blast furnace gas nozzles 8 are distributed in a ring shape.
The inner ring-shaped blast furnace gas nozzle 6 is arranged in the middle of a plurality of outer distributed blast furnace gas nozzles 8.
The air inlet 2 is respectively communicated with one end of a rotational flow secondary air nozzle 7, a rotational flow after-burning air nozzle 9 and a central air pipe 5, and the other ends of the rotational flow secondary air nozzle 7, the rotational flow after-burning air nozzle 9 and the central air pipe 5 are communicated with a combustion stabilizing cavity 10; the gas sprayed into the stable combustion cavity 10 by the rotational flow secondary air nozzle 7 and the rotational flow after-burning air nozzle 9 and the pressure gradient generated by the rotational flow are distributed to form a backflow area.
The gas guns are divided into two groups, one group of gas guns are positioned in the inner layer central air pipe 5 to jet fuel, so that stable combustion of flame is ensured, and the stability is not influenced by factors such as total excess air, combustor load and the like.
The second group of air guns are positioned in the backflow zone, and the efficient staged combustion of fuel can be realized no matter a single combustor or a plurality of combustors, so that the emission of nitrogen oxides and carbon monoxide is effectively controlled and reduced.
And a heat accumulator 3 is arranged in the combustion stabilizing cavity 10 and is used for providing a heat source during low-load combustion stabilization and ignition. A throat is arranged in the combustion stabilizing cavity 10, and the throat angle alpha is 15 degrees, so that the stability of flame is improved, and the wide load regulation ratio of the combustor is ensured.
The central air pipe 5 is provided with a flow expansion cone 4, and low-heat value gas flows into an inner annular blast furnace gas nozzle 6 and an outer dispersion type blast furnace gas nozzle 8 according to a set proportion after passing through a gas inlet 1, then flows through the flow expansion cone 4 and enters a stable combustion cavity 10.
The arrangement of the central pipe increases the contact and heat exchange perimeter of the low-calorific-value gas and the high-temperature backflow flue gas, and provides a pressure gradient distribution condition for the generation of the central backflow area.
Wherein, the low-heat value gas nozzle is divided into an inner layer and an outer layer, the inner layer corresponds to the inner annular blast furnace gas nozzle 6, and the outer layer corresponds to the outer dispersion type blast furnace gas nozzle 8.
The air nozzle is divided into an inner layer, a middle layer and an outer layer, wherein the inner layer corresponds to the central air pipe 5, the middle layer corresponds to the rotational flow secondary air nozzle 7, and the outer layer corresponds to the rotational flow afterburning air nozzle 9.
Secondary air and post-combustion air respectively enter from the rotational flow secondary air nozzle 7 and the rotational flow post-combustion air nozzle 9 and are guided into the stable combustion cavity 10; and the secondary air and the afterburning air are sprayed into the stable combustion cavity 10 by adopting rotational flow, the rotational flow strength is moderate, the pressure gradient generated by the rotational flow is distributed to form a backflow area, the proper radial pressure delays the outward diffusion of the low-heat-value gas, the outward diffusion of the low-heat-value gas is slowed down, and the ignition and stable combustion of the low-heat-value gas are facilitated.
The central air pipe 5 is connected with a flow expansion cone 4, air enters by adopting rotational flow, and the air can move forwards and also move along the radial direction, so that low-calorific-value coal gas and the air are intensively mixed and combusted in the stable combustion cavity 10.
The stable combustion cavity 10 has enough length, so that the low-heat value gas and the air can be fully combusted at a high-temperature section, and the combustion efficiency is improved.
Meanwhile, low-heat value gas is directly sprayed into the combustion stabilizing cavity 10 from the inner annular blast furnace gas nozzle 6 and the outer dispersing type blast furnace gas nozzle 8, so that the diffusion of the low-heat value gas to the wind side is slowed down, and the ignition and stable combustion of the low-heat value gas are facilitated. The low-heat value gas adopts direct current, the airflow does not rotate, the speed along the radial direction of the pipeline can not be generated, the impurities in the airflow are not easy to adhere to the nozzle, meanwhile, the flow section of the nozzle of the low-heat value gas is large, and the low-heat value gas can be conveniently cleaned when the furnace is shut down even if slight adhesion exists.
The unique structure of closing up earlier then flaring in the steady chamber 10, the stability of multiplicable flame guarantees combustor wide load adjustment ratio, and steady chamber 10 has designed a throat, and the throat angle is 15 degrees.
Because the air volume of the main burner area is small, only the air volume required by stable ignition and partial fuel combustion is maintained, meanwhile, the entrainment of high-temperature flue gas further reduces the oxygen content of the main combustion area, the flame temperature peak value is reduced towards the core flame, and because the mixing of outer ring air is delayed, a stronger reducing atmosphere is formed, and the generation of Nox is inhibited.
While the present invention has been described in detail with reference to the embodiments, the scope of the present invention should not be limited to the embodiments. Various modifications and changes may be made by those skilled in the art without inventive step within the scope of the appended claims.
Claims (6)
1. A gas burner characterized by: comprises a coal gas inlet, an air inlet and a combustion stabilizing cavity communicated with the coal gas inlet and the air inlet;
the gas inlet is respectively communicated with the inner annular blast furnace gas nozzle and one end of each of the plurality of outer dispersion type blast furnace gas nozzles; the other ends of the inner annular blast furnace gas nozzle and the plurality of outer dispersed blast furnace gas nozzles are communicated with the stable combustion cavity; the air inlet is respectively communicated with one end of the rotational flow secondary air nozzle, the rotational flow after-burning air nozzle and one end of the central air pipe, and the other ends of the rotational flow secondary air nozzle, the rotational flow after-burning air nozzle and the central air pipe are communicated with the stable burning cavity; the cyclone secondary air nozzle and the cyclone after-combustion air nozzle spray gas in the stable combustion cavity, and the pressure gradient generated by the cyclone is distributed to form a backflow area; and a group of gas guns are arranged in the central air pipe and the backflow area.
2. The gas burner of claim 1, wherein: the inner annular blast furnace gas nozzles are arranged in the middle of the outer distributed blast furnace gas nozzles.
3. The gas burner of claim 1, wherein: and a plurality of the external dispersion type blast furnace gas nozzles are distributed in an annular shape.
4. The gas burner of claim 1, wherein: and a heat accumulator is arranged in the stable combustion cavity.
5. The gas burner of claim 1, wherein: a throat is formed in the combustion stabilizing cavity, and the angle alpha of the throat is 15 degrees.
6. The gas burner of claim 1, wherein: and the central air pipe is provided with a flow expansion cone.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922072090.6U CN211424389U (en) | 2019-11-26 | 2019-11-26 | Gas burner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922072090.6U CN211424389U (en) | 2019-11-26 | 2019-11-26 | Gas burner |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211424389U true CN211424389U (en) | 2020-09-04 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201922072090.6U Active CN211424389U (en) | 2019-11-26 | 2019-11-26 | Gas burner |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211424389U (en) |
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2019
- 2019-11-26 CN CN201922072090.6U patent/CN211424389U/en active Active
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