CN109489039B - Combustor nozzle axial flow air duct structure and combustor nozzle - Google Patents
Combustor nozzle axial flow air duct structure and combustor nozzle Download PDFInfo
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- CN109489039B CN109489039B CN201811650917.0A CN201811650917A CN109489039B CN 109489039 B CN109489039 B CN 109489039B CN 201811650917 A CN201811650917 A CN 201811650917A CN 109489039 B CN109489039 B CN 109489039B
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- 239000002817 coal dust Substances 0.000 claims description 4
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 238000003754 machining Methods 0.000 abstract description 2
- 239000007789 gas Substances 0.000 description 43
- 239000003245 coal Substances 0.000 description 18
- 238000000034 method Methods 0.000 description 7
- 239000003034 coal gas Substances 0.000 description 6
- 239000000571 coke Substances 0.000 description 6
- 238000002347 injection Methods 0.000 description 6
- 239000007924 injection Substances 0.000 description 6
- 239000002737 fuel gas Substances 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 2
- 230000004888 barrier function Effects 0.000 description 2
- 239000004568 cement Substances 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 230000007423 decrease Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
- 239000002912 waste gas Substances 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D17/00—Burners for combustion conjointly or alternatively of gaseous or liquid or pulverulent fuel
- F23D17/005—Burners for combustion conjointly or alternatively of gaseous or liquid or pulverulent fuel gaseous or pulverulent fuel
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D2204/00—Burners adapted for simultaneous or alternative combustion having more than one fuel supply
- F23D2204/20—Burners adapted for simultaneous or alternative combustion having more than one fuel supply gaseous and pulverulent fuel
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
Abstract
The invention discloses a burner nozzle axial flow air duct structure, which comprises an outer air shaft and an outer shaft sleeved outside the outer air shaft, wherein an axial flow air duct is arranged between the outer air shaft and the outer shaft; the front end of the outer wind shaft is an outer wind shaft head with a conical outer surface, and the front end of the outer wind shaft head has a large diameter and the rear end has a small diameter. The beneficial effects of the invention are as follows: the flow rate of the axial flow air channel between the outer air shaft and the outer shaft is adjusted only by machining the outer air shaft head 240 into a conical surface without turning a conical groove, so that the operation is simple and the cost is low. For a burner using gas, there is no need to provide an ignition channel. In the nozzle adopting the ignition channel, the oil gun in the ignition channel does not need a high-pressure pipeline, and the cost is low.
Description
Technical Field
The invention belongs to the field of combustors, and particularly relates to an axial flow air duct structure of a combustor nozzle.
Background
The nozzle of the existing pulverized coal burner mostly comprises an oil injection port, a rotational flow air duct, a pulverized coal air duct and an axial flow air duct from inside to outside, and one or more air channels are arranged according to different actual conditions, such as the burner in patent CN 106885237A. The burner for burning pulverized coal requires special pulverized coal, and the coke oven exhaust gas or converter exhaust gas of the existing steel plant or cement plant also requires special treatment. There is a need for a gas burner that saves energy, protects the environment, and utilizes exhaust gases.
The pulverized coal combustion needs to be ignited from the inside through an oil injection port. The burner using inflammable gas such as gas, fuel gas and the like does not need to be ignited from the inside, and the burner can be ignited and burned from the outside after the fuel gas is sprayed out, and an oil injection channel and an oil injection port are not necessary. The existing burner comprises an oil injection channel and an oil injection port.
In addition, the axial flow air flow rate adjusting method in the axial flow air duct in the existing burner nozzle is as follows: the axial flow duct is constituted by a space between the outer wind shaft and an outer shaft provided outside the outer wind shaft. The outer wall of the outer wind shaft is uniformly provided with conical grooves along the circumference, and the cross section of each conical groove is gradually increased from the head to the tail along the axis of the outer wind shaft. Thus, the outer shaft and the outer wind shaft relatively move forwards and backwards, the section of the air outlet is changed, and the flow of the axial flow wind is adjusted. The method needs to process the conical groove, and the conical groove has complex processing steps and consumes more time. There is a need for an axial flow air flow rate adjustment structure that is simple to manufacture and low in cost.
Disclosure of Invention
The invention provides a burner nozzle axial flow air duct structure.
The object of the invention is achieved in the following way:
The burner nozzle axial flow air duct structure comprises an outer air shaft and an outer shaft sleeved outside the outer air shaft, and an axial flow air duct is arranged between the outer air shaft and the outer shaft; the front end of the outer wind shaft is an outer wind shaft head with a conical outer surface, and the front end of the outer wind shaft head has a large diameter and the rear end has a small diameter.
And the outer wind shaft head is provided with a wind outlet groove along the circumference.
The air outlet groove is a part of the cylindrical hole, and the axis of the air outlet groove is parallel to the axis of the outer air shaft.
The outer wind shaft head also comprises a section of cylindrical outer surface which is connected with one end with larger diameter of the conical outer surface.
The front end of the inner wall of the outer shaft is cylindrical, the diameter of the front end of the inner wall of the outer shaft is larger than that of the rear end of the inner wall of the outer shaft, and the two sections of cylinders are connected by adopting a conical outer surface.
The burner nozzle comprises the axial flow air duct.
The beneficial effects of the invention are as follows: the flow rate of the axial flow air channel between the outer air shaft and the outer shaft is adjusted only by machining the outer air shaft head 240 into a conical surface without turning a conical groove, so that the operation is simple and the cost is low. For a burner using gas, there is no need to provide an ignition channel. In the nozzle adopting the ignition channel, the oil gun in the ignition channel does not need a high-pressure pipeline, and the cost is low.
Drawings
FIG. 1 is an overall schematic of a combustor.
Fig. 2 is a schematic view of a nozzle.
Fig. 3 is a sectional view of a portion of the nozzle and air supply duct combination.
Fig. 4 is a schematic view of a swirl windhead.
Fig. 5 is a schematic view of an external wind head.
Fig. 6 is a schematic view of an outer shaft.
Fig. 7 is a cross-sectional view of the oil gun.
Wherein 2 is the nozzle, 20 is the central shaft, 201 is the swirl air head, 202 is the helical groove, 203 is the central jet orifice, 21 is the inner air shaft, 22 is the inner air shaft, 23 is the outer air shaft, 24 is the outer air shaft, 25 is the outer shaft, 26 is the pulverized coal air duct, 27 is the first gas air duct, 28 is the second gas air duct, 29 is the axial flow air duct, 240 is the outer air shaft head, 241 is the air outlet groove, 30 is the swirl air duct, 31 is the outer tube, 32 is the jet orifice, 33 is the high pressure air inlet, 34 is the oil outlet pipe, 35 is the oil outlet, 36 is the mixing chamber, 4 is the telescopic joint, 5 is the air inlet pipe, 50 is the inner air pipe, 51 is the pulverized coal pipe, 52 is the inner gas pipe, 53 is the outer gas pipe, 54 is the outer air pipe, 55 is the central pipe, 6 is the air pipe, 7 is the first branched air pipe, 8 is the second branched air pipe.
Detailed Description
As shown in fig. 1-7, a gas burner nozzle, nozzle 2 comprises an inner air duct and an outer air duct; at least one fuel gas air duct is arranged between the two air ducts. The central shaft 20 is arranged at the central part of the nozzle 2, and an ignition channel is not arranged in the central shaft 20. Compressed air is introduced into the air duct for supporting combustion. The fuel gas air duct is used for burning combustible gas such as coal gas. The existing burner has ignition channels. The burner mainly using gas such as coal gas does not need to be specially ignited from the inside of the burner, and the burner can be ignited from the outside and can also burn fully. The burner without the ignition channel can be manufactured again, and the original ignition channel can be blocked. The two air channels can be an axial flow channel, a cyclone channel or a vortex channel on the outer side. The burner tip may have more than two air passages. The gas duct can be two.
In a specific embodiment, the nozzle 2 is provided with a central shaft 20, an inner wind shaft 21, an inner wind shaft 22, an outer wind shaft 23, an outer wind shaft 24 and an outer shaft 25 from inside to outside. A rotational flow air duct 30 is arranged between the central shaft 20 and the inner air shaft 21, a coal dust air duct 26 is arranged between the inner air shaft 21 and the inner air shaft 22, a first gas air duct 27 is arranged between the inner air shaft 22 and the outer air shaft 23, a second gas air duct 28 is arranged between the outer air shaft 23 and the outer air shaft 24, and an axial flow air duct 29 is arranged between the outer air shaft 24 and the outer shaft 25. The first gas duct 27 and the second gas duct 28 can be respectively filled with coke oven gas and converter gas or any one of the coke oven gas and the converter gas. The coke oven gas and the converter gas are waste gases in a steel plant or a cement plant, and are reused, so that resources are saved. The pulverized coal channel 26 is filled with pulverized coal, and the pulverized coal can be ignited without an ignition channel because the pulverized coal is more coal gas and less pulverized coal. The outer surface of the central shaft 20 is cylindrical. The inner and outer surfaces of the inner air shaft 21, the inner air shaft 22, the outer air shaft 23 and the outer air shaft 24 are all cylindrical and have annular structures. The inner surface of the outer shaft 25 is cylindrical. The central shaft 20 and the inner and outer cylindrical surfaces of the inner wind shaft 21 are relatively moved by the telescopic joint 4 of the relative movement device. The outer wind shaft 24 and the inner and outer surfaces of the outer shaft 25 are also relatively moved by the expansion joint 4, thereby adjusting the flow rate, flow rate and rotation angle of the ejected compressed air.
The front end of the central shaft 20 is provided with a rotational flow air head 201, the outer wall of the rotational flow air head 201 is provided with a spiral groove 202, and a spiral rotational flow air channel 30 is formed between the spiral groove 202 and the inner wall of the inner air shaft 21. As the spiral groove 202 extends in the outlet direction of the nozzle 2, the cross-sectional area of the spiral groove 202 gradually decreases. The cross section of the spiral groove 202 is semicircular, and the helix angle of the spiral groove 202 is about 45 degrees. The inner wind shaft 21 moves back and forth, and the area of the air outlet of the cyclone air duct 30 can be adjusted, so that the flow of the compressed air can be adjusted.
The outer air shaft 24 can be provided with an air outlet groove which is conical, and the diameter of the air outlet groove at the opening of the nozzle 2 is minimum. The structure is a conventional structure for adjusting the size of the axial flow air outlet, and the conical air outlet groove is difficult to process and has high manufacturing cost. A new method for adjusting the flow rate of the air outlet of the axial flow air channel can be adopted.
The burner nozzle axial flow air duct structure comprises an outer air shaft 24 and an outer shaft 25 sleeved outside the outer air shaft 24, and an axial flow air duct 29 is arranged between the outer air shaft 24 and the outer shaft 25. The front end of the outer wind shaft 24 is an outer wind shaft head 240 with a conical outer surface, and the front end of the outer wind shaft head 240 has a large diameter and the rear end has a small diameter. The outer wind shaft 24 and the outer shaft 25 are both annular tubes. The front end of the outer wind shaft 24 is the end of the outlet of the axial flow wind channel 29. The rear end of the outer wind shaft 24 is cylindrical, and the outer diameter is smaller than the diameter of the outer wind shaft head 240. The inner wall of the outer shaft 25 is cylindrical. An axial flow air duct 29 is arranged between the inner wall of the outer shaft 25 and the outer wall of the outer wind shaft 24. The air outlet of the axial flow air is the gap between the end face of the outer shaft 25 and the conical inner wall of the outer air shaft 24 corresponding to the end face of the outer shaft 25. When the outer shaft 25 and the outer wind shaft 24 move forward and backward, the air outlet of the axial flow air duct 29 is gradually increased or gradually decreased. The outer wind shaft head 240 can be processed into a conical surface, so that the operation is simple and the cost is low. The axial flow duct 29 is typically the outermost duct of the burner nozzle 2. Of course, it may be disposed in the rest of the place.
The outer damper head 240 is provided with a damper 241 along the circumference. The air outlet groove 241 is a part of the air outlet. The air outlet grooves 241 are uniformly provided on the circumference of the outer air shaft head 240. The air outlet groove 241 is a part of the cylindrical hole, and the axis of the air outlet groove 241 is parallel to the axis of the outer air shaft 24. The air outlet groove 241 is convenient to process, and after the conical surface of the outer air shaft head 240 is turned, only holes are punched along the outer air shaft head 240, and the air outlet groove 241 is formed at the juncture of the holes and the outer air shaft head 240. The conical hole used before is difficult to process, high in cost and long in time consumption. The existing air outlet groove 241 is low in processing cost.
The outer wind head 240 further includes a cylindrical outer surface that is connected to the end of the conical outer surface with the larger diameter. Thus, in the initial state, the air outlet of the axial flow duct 29 includes only the air outlet groove 241. After the outer shaft 25 and the outer wind shaft 24 move back and forth, the air outlet becomes larger, and the air outlet not only comprises the air outlet groove 241, but also comprises a gap between the inner wall of the outer shaft 25 and the outer wall of the outer wind shaft 24.
The front end of the inner wall of the outer shaft 25 is cylindrical, the diameter of the outer shaft is larger than that of the rear end of the inner wall of the outer shaft 25, and the two sections of cylinders are connected by adopting a conical outer surface. If the diameters of the inner walls of the outer shaft 25 are consistent, when the flow rate of the axial flow wind is regulated, the front end surface of the outer shaft 25 needs to be moved to the corresponding position of the conical surface of the outer wind shaft head 241, and after the wind is flushed out from the air outlet, no barrier exists above the wind, so that the wind is easy to spread out of the circumference of the outer shaft 25. In the arrangement of the invention, after the wind is flushed out from the air outlet, the front end of the inner wall of the outer shaft 25 is used as a barrier, so that the axial flow wind can be drawn close to the inside of the circumference of the outer shaft 25, and the divergence is avoided. Thereby gathering the flame. Wherein the diameter of the cylinder at the rear end of the inner wall of the outer shaft 25 may be the same as the diameter of the cylinder outer surface of the outer wind shaft head 241. The burner nozzle comprising the axial flow air duct is within the protection scope of the invention, wherein the axial flow air duct is not necessarily the air duct of the outermost layer of the burner nozzle
For the gas burner, the ignition passage may not be provided, or may be provided. In the above embodiment, the addition of the ignition channels results in a six-channel burner nozzle. The nozzle 2 is provided with a central shaft 20, an inner wind shaft 21, an inner wind shaft 22, an outer wind shaft 23, an outer wind shaft 24 and an outer shaft 25 from inside to outside. A rotational flow air duct 30 is arranged between the central shaft 20 and the inner air shaft 21, a coal dust air duct 26 is arranged between the inner air shaft 21 and the inner air shaft 22, a first gas air duct 27 is arranged between the inner air shaft 22 and the outer air shaft 23, a second gas air duct 28 is arranged between the outer air shaft 23 and the outer air shaft 24, and an axial flow air duct 29 is arranged between the outer air shaft 24 and the outer shaft 25.
The difference is that; an ignition channel is arranged in the central shaft 20, and a central spray hole 203 is arranged at the end part of the central shaft. The ignition channel is communicated with a central pipeline 55 of the burner, an igniter and an oil gun are arranged in the central pipeline 55, the oil gun comprises an outer pipe 31, a nozzle 32 is arranged at the end part of the outer pipe 31 close to the nozzle 2, a high-pressure air inlet 33 is arranged at the tail part of the outer pipe 31, an oil outlet pipe 34 is arranged in the outer pipe 31, an oil outlet 35 is arranged at the end part of the oil outlet pipe 34 close to the nozzle 32, and a mixing chamber 36 is arranged between the oil outlet 35 and the nozzle.
In practice, the oil enters the mixing chamber 36 from the oil outlet 35 and is mixed with high-pressure air, atomized oil is sprayed out from the spray holes 32, and the atomized oil is ignited by an igniter. The original oil gun does not adopt compressed air, and oil is pressurized by a high-pressure pump. Directly introducing high-pressure oil, and igniting with an igniter after the high-pressure oil is sprayed out. The oil gun needs to bear high pressure and needs to be made of high-pressure resistant materials. In the embodiment, the oil is not pressurized, compressed air is adopted to atomize the oil, and low-pressure pipe fittings can be used, so that the cost is reduced. The rest of the structure is the same as the technical scheme of the nozzle without the ignition channel.
The gas burner adopting the nozzle has the following specific structure: for a burner without ignition channels, the air supply duct 5 comprises, from inside to outside, an inner air duct 50, a coal dust duct 51, an inner gas duct 52, an outer gas duct 53 and an outer air duct 54. Wherein the inner air duct 50 is connected to the inner air shaft 21 of the nozzle 2, the pulverized coal duct 51 is connected to the inner air shaft 22, the inner gas duct 52 is connected to the outer air shaft 23, the outer gas duct 53 is connected to the outer air shaft 24, and the outer air duct 54 is connected to the outer shaft 25. Compressed air is introduced into the inner air pipeline 50, pulverized coal is introduced between the inner air pipeline 50 and the pulverized coal pipeline 51, converter gas is introduced between the pulverized coal pipeline 51 and the inner gas pipeline 52, coke oven gas is introduced between the inner gas pipeline 52 and the outer gas pipeline 53, and compressed air is introduced between the outer gas pipeline 53 and the outer air pipeline 54. The ventilation positions of the coke oven gas and the converter gas can be interchanged, and one gas can be introduced.
For a burner with an ignition channel, the ignition channel is arranged inside the central shaft 20, the air supply pipeline comprises a central pipeline 55 communicated with the ignition channel, and oil is filled in the central pipeline 55 for ignition. The specific ignition mechanism can adopt the mode of the prior art, and can also adopt the structure of the oil gun.
The expansion joint 4 is arranged on the inner air pipeline 50, and the expansion joint 4 is arranged on any one of the outer gas pipeline 53 and the outer air pipeline 54. The air pipe 6 is connected with a compressed air source, and the air pipe 6 is respectively communicated with the inside of the inner air pipeline 50 and the inside of the outer air pipeline 54 through a first branch air pipe 7 and a second branch air pipe 8; also comprises a coal powder pipe 9 communicated with the inside of the coal powder pipeline 51, and two coal gas inlets communicated with the inside of the inner coal gas pipeline 52 and the inside of the outer coal gas pipeline 53.
In specific implementation, the expansion joint 4 of the inner air pipeline 50 stretches and contracts to drive the inner air pipeline 50 and the inner air shaft 21 to move, so that the flow of the air outlet of the cyclone air duct 30 is adjusted. The expansion joint 4 on the outer air pipeline 54 expands and contracts to drive the outer shaft 25 to move so as to adjust the flow of the air outlet of the axial flow air channel 29.
The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
Claims (1)
1.A burner nozzle, characterized in that: the nozzle is provided with a central shaft, an inner wind shaft, an inner gas shaft, an outer wind shaft and an outer shaft from inside to outside; a rotational flow air channel is arranged between the central shaft and the inner air shaft, a coal dust air channel is arranged between the inner air shaft and the inner air shaft, a first gas air channel is arranged between the inner air shaft and the outer air shaft, a second gas air channel is arranged between the outer air shaft and the outer air shaft, and an axial flow air channel is arranged between the outer air shaft and the outer shaft; the ignition channel is not arranged in the central shaft; the front end of the outer wind shaft is an outer wind shaft head with a conical outer surface, and the front end of the outer wind shaft head is large in diameter and the rear end of the outer wind shaft head is small in diameter; the outer wind shaft head is provided with a wind outlet groove along the circumference; the air outlet groove is a part of the cylindrical hole, and the axis of the air outlet groove is parallel to the axis of the outer air shaft; the outer wind shaft head also comprises a section of cylindrical outer surface, and the cylindrical outer surface is connected with one end with a larger diameter of the conical outer surface; the front end of the inner wall of the outer shaft is cylindrical, the diameter of the front end of the inner wall of the outer shaft is larger than that of the rear end of the inner wall of the outer shaft, and the two sections of cylinders are connected by adopting a conical outer surface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811650917.0A CN109489039B (en) | 2018-12-31 | 2018-12-31 | Combustor nozzle axial flow air duct structure and combustor nozzle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811650917.0A CN109489039B (en) | 2018-12-31 | 2018-12-31 | Combustor nozzle axial flow air duct structure and combustor nozzle |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109489039A CN109489039A (en) | 2019-03-19 |
| CN109489039B true CN109489039B (en) | 2024-05-07 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811650917.0A Active CN109489039B (en) | 2018-12-31 | 2018-12-31 | Combustor nozzle axial flow air duct structure and combustor nozzle |
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| Country | Link |
|---|---|
| CN (1) | CN109489039B (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001200308A (en) * | 2000-01-19 | 2001-07-24 | Nkk Corp | Pulverized coal blowing burner |
| CN201129748Y (en) * | 2007-08-20 | 2008-10-08 | 上海诺特飞博燃烧设备有限公司 | Industry combusting device igniting gun |
| CN101315185A (en) * | 2008-06-12 | 2008-12-03 | 邯郸新兴重型机械有限公司 | Multicenter combustor nozzle |
| CN103672906A (en) * | 2013-12-12 | 2014-03-26 | 贵州安凯达实业股份有限公司 | Converter gas and pulverized coal mixed combustion device |
| CN206504324U (en) * | 2017-02-23 | 2017-09-19 | 河南汇金智能装备有限公司 | The outer spin axis of combustor nozzle |
| CN108443872A (en) * | 2018-02-10 | 2018-08-24 | 邓建新 | A kind of five runner coal burners |
| CN209726202U (en) * | 2018-12-31 | 2019-12-03 | 河南汇金智能装备有限公司 | Burner nozzle axis stream air passage structure and burner nozzle |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7540154B2 (en) * | 2005-08-11 | 2009-06-02 | Mitsubishi Heavy Industries, Ltd. | Gas turbine combustor |
-
2018
- 2018-12-31 CN CN201811650917.0A patent/CN109489039B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001200308A (en) * | 2000-01-19 | 2001-07-24 | Nkk Corp | Pulverized coal blowing burner |
| CN201129748Y (en) * | 2007-08-20 | 2008-10-08 | 上海诺特飞博燃烧设备有限公司 | Industry combusting device igniting gun |
| CN101315185A (en) * | 2008-06-12 | 2008-12-03 | 邯郸新兴重型机械有限公司 | Multicenter combustor nozzle |
| CN103672906A (en) * | 2013-12-12 | 2014-03-26 | 贵州安凯达实业股份有限公司 | Converter gas and pulverized coal mixed combustion device |
| CN206504324U (en) * | 2017-02-23 | 2017-09-19 | 河南汇金智能装备有限公司 | The outer spin axis of combustor nozzle |
| CN108443872A (en) * | 2018-02-10 | 2018-08-24 | 邓建新 | A kind of five runner coal burners |
| CN209726202U (en) * | 2018-12-31 | 2019-12-03 | 河南汇金智能装备有限公司 | Burner nozzle axis stream air passage structure and burner nozzle |
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| Publication number | Publication date |
|---|---|
| CN109489039A (en) | 2019-03-19 |
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