CN112283706B - Multi-gun spiral-flow type low-nitrogen combustor - Google Patents
Multi-gun spiral-flow type low-nitrogen combustor Download PDFInfo
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- CN112283706B CN112283706B CN202011309827.2A CN202011309827A CN112283706B CN 112283706 B CN112283706 B CN 112283706B CN 202011309827 A CN202011309827 A CN 202011309827A CN 112283706 B CN112283706 B CN 112283706B
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- Prior art keywords
- gun
- cyclone
- gas
- swirl
- ring
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- IJGRMHOSHXDMSA-UHFFFAOYSA-N nitrogen Substances N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 title claims abstract description 20
- 229910052757 nitrogen Inorganic materials 0.000 title claims abstract description 18
- 239000007789 gas Substances 0.000 claims abstract description 103
- 238000002347 injection Methods 0.000 claims abstract description 30
- 239000007924 injection Substances 0.000 claims abstract description 30
- 238000002485 combustion reaction Methods 0.000 claims abstract description 28
- 239000007921 spray Substances 0.000 claims abstract description 26
- 239000002737 fuel gas Substances 0.000 claims description 16
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 abstract description 14
- 239000003345 natural gas Substances 0.000 abstract description 7
- 230000000694 effects Effects 0.000 abstract description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 4
- 239000003546 flue gas Substances 0.000 description 4
- 230000007613 environmental effect Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 3
- 239000010426 asphalt Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000000567 combustion gas Substances 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 230000033001 locomotion Effects 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 239000002817 coal dust Substances 0.000 description 1
- 239000002283 diesel fuel Substances 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 239000002360 explosive Substances 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000000295 fuel oil Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000004449 solid propellant Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
- F23D14/02—Premix gas burners, i.e. in which gaseous fuel is mixed with combustion air upstream of the combustion zone
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
- F23D14/46—Details, e.g. noise reduction means
- F23D14/62—Mixing devices; Mixing tubes
- F23D14/64—Mixing devices; Mixing tubes with injectors
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
- F23D14/46—Details, e.g. noise reduction means
- F23D14/70—Baffles or like flow-disturbing devices
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
Abstract
The invention provides a multi-gun rotational flow type low-nitrogen combustor which comprises a cyclone, a gas injection system and a combustor cylinder; the cyclone and the gas injection system are arranged in the combustor cylinder; the cyclone comprises a cyclone outer ring and a cyclone inner ring which are concentrically arranged, and a cyclone straight blade arranged between the cyclone outer ring and the cyclone inner ring; a plurality of blade grooves are formed in the rotational flow straight blades; the outer part of the rotational flow outer ring is also concentrically provided with a through hole ring, and a plurality of rotational flow through holes are arranged on the through hole ring; the gas injection system comprises a central gas spray gun and a plurality of annular gas spray guns; the burner cylinder is also provided with a gas inlet ring which is communicated with an annular gas inlet; the burner cylinder is also communicated with a main gas inlet. By the aid of the technical scheme, the combustion effect of natural gas and air mixed combustion can be optimized.
Description
Technical Field
The invention relates to the field of low-nitrogen combustors, in particular to a multi-gun cyclone low-nitrogen combustor.
Background
The asphalt stirring equipment in China mainly uses liquid and solid fuels such as diesel oil, heavy residual oil, fuel oil, coal dust with various qualities and the like. Natural gas is uniquely advantageous in terms of fuel pretreatment process, operability, and environmental protection compared to the above-described fuels. The importance of environmental protection has been agreed to by various industries both internationally and domestically, and environmental protection work is put in a very important place today where the environment is seriously deteriorated.
Therefore, the gas burner has more and more matched application on stirring equipment, and the explosive growth has more occurred in recent years. A gas burner is a device for jetting and mixing natural gas and air in a certain manner to burn. While the flue gas produced by the combustion of the burner contains atmospheric pollutants NOx. In recent years, along with strict policy of energy conservation and emission reduction, the requirements on NOx emission limitation in industrial flue gas are higher and higher. At present, a plurality of gas burners which are not optimally designed and are not used in asphalt mixing stations have higher NOx emission concentration in flue gas and serious environmental pollution.
Disclosure of Invention
The invention aims to provide a multi-gun spiral-flow type low-nitrogen burner which can optimize the combustion effect of mixed combustion of natural gas and air.
In order to solve the technical problems, the invention provides a multi-gun spiral-flow type low-nitrogen combustor, which comprises a cyclone, a gas injection system and a combustor cylinder; the cyclone and the gas injection system are arranged in the combustor cylinder; the cyclone comprises a cyclone outer ring and a cyclone inner ring which are concentrically arranged, and a cyclone straight blade arranged between the cyclone outer ring and the cyclone inner ring; a plurality of blade grooves are formed in the rotational flow straight blades; the outer part of the rotational flow outer circular ring is also concentrically provided with a through hole circular ring, and a plurality of rotational flow through holes are arranged on the through hole circular ring;
the gas injection system comprises a central gas injection gun and a plurality of annular gas injection guns, wherein the annular gas injection guns are arranged in a central symmetry way by taking the central gas injection gun as the center; the top ends of the central gas spray gun and the annular gas spray gun are protruded with a boss, and the boss is respectively concentric with the central gas spray gun and the annular gas Peng Jiang; a plurality of first diversion through holes are uniformly formed in the circumferential direction of the boss and the circumferential direction of the tail end of the central gas spray gun connected with the boss;
The burner cylinder is also provided with a gas inlet ring which is communicated with an annular gas inlet; the burner cylinder is also communicated with a main gas inlet.
In a preferred embodiment, a plurality of relief holes are circumferentially arranged on the through hole ring, the central gas spray gun penetrates through the center of the cyclone inner ring, and the annular gas spray gun penetrates through the relief holes.
In a preferred embodiment, two ends of the swirl straight blade are respectively connected with the swirl inner ring and the swirl outer ring; the rotational flow straight blades and the radial interval angle of the rotational flow inner circular ring are arranged.
In a preferred embodiment, the shape of the blade grooves is spherical, the depth of the blade grooves is less than one fourth of the thickness of the swirl straight blades, and the distance between the two blade grooves is 3 to 5 times of the radius of the blade grooves.
In a preferred embodiment, the surface of the swirl straight vane forms a turbulent layer.
In a preferred embodiment, the burner cylinder comprises a hood, a throat and a cylinder body which are arranged in sequence; the diameter of the throat opening gradually increases from the barrel body to the head cover; the throat and the head cover form a combustion chamber.
In a preferred embodiment, the boss on the annular gas spray gun and the circumferential direction of the annular gas spray gun are uniformly provided with a plurality of second diversion through holes.
In a preferred embodiment, the central gas lance communicates with the primary gas inlet and the annular gas lance communicates with the gas inlet ring.
Compared with the prior art, the technical scheme of the invention has the following beneficial effects:
(1) The cyclone can form a turbulent layer when the airflow passes through after the cyclone straight blade treatment, and is favorable for forming strong rotation disturbance and airflow loss, so that an air dynamic field which is more suitable for combustion is formed in the furnace, the disturbance of combustion airflow is enhanced, the combustion state of the combustion gas in the furnace is more stable, and the combustion state of the combustion gas in the furnace is more stable. When the swirler is provided in the burner, the degree of mixing between the fuel gas and the air is enhanced, so that the combustion strength is increased, and the combustion torch in the furnace is shortened, and therefore, the burner can be reduced in size with the same combustion load.
(2) The invention optimizes the structure of the gas inlet and can realize the selection of the gas inlet according to the work demand, thereby reducing the waste of natural gas and preventing the emission of NOx caused by insufficient combustion of the gas.
(3) The invention adopts the overall optimized structure of the annular gas injection system and the cyclone processed by the blades, and is a burner with high combustion efficiency and low emission of nitrogen oxides. Through the low-nitrogen burner, the ignition speed of the fuel gas is high, the flame is stable, the fuel gas is full, the combustion state is stable, the probability of backfire and fire removal is reduced, and the emission of NOx is effectively reduced.
Drawings
FIG. 1 is a schematic view of a multi-gun swirl low-nitrogen burner in accordance with a preferred embodiment of the present invention;
FIG. 2 is a schematic view of a cyclone according to a preferred embodiment of the present invention;
FIG. 3 is an enlarged partial schematic view of a through hole ring according to a preferred embodiment of the present invention;
FIG. 4 is a schematic view of a partial structure of a fuel gas injection system according to a preferred embodiment of the present invention;
fig. 5 is a schematic view showing the structure of a fuel gas injection system according to a preferred embodiment of the present invention.
Detailed Description
The invention is further described below with reference to the drawings and detailed description.
A multi-gun swirl low-nitrogen burner, referring to fig. 1 to 5, comprises a swirler 1, a gas injection system 2 and a burner cylinder 3; the cyclone 1 and the gas injection system 2 are arranged in the burner cylinder 3; the burner cylinder 3 comprises a head cover 33, a throat 34 and a cylinder body 35 which are sequentially arranged; the diameter of the throat 34 gradually increases from the barrel 35 to the head cover 33; the throat 34 and the hood 33 form a combustion chamber. The gas and air mixing process under the combustion chamber can form good vortex motion, and the mixing quality is improved. The cyclone 1 comprises a cyclone outer ring 12 and a cyclone inner ring 11 which are concentrically arranged, and a cyclone straight blade 13 arranged between the cyclone outer ring 12 and the cyclone inner ring 11; the swirl straight blades 13 are provided with a plurality of blade grooves 131 which are distributed in parallel; due to the existence of the blade grooves 131, a turbulent layer is formed on the surface of the swirl straight blade 13 by the airflow, and the turbulent layer which is tightly attached to the surface of the swirl straight blade 13 can effectively prevent the airflow from separating on the surface of the swirl straight blade 13, so that on one hand, the flow loss of the airflow at the position is effectively reduced, a large amount of natural gas is saved, on the other hand, stable mixed airflow is formed, and the flame stabilizing boundary is widened. The outer part of the rotational flow outer circular ring 12 is also concentrically provided with a through hole circular ring 14, and a plurality of rotational flow through holes 141 are arranged on the through hole circular ring 14; the air entering from the cyclone through holes 141 is well mixed with natural gas, and the cyclone 1 contributes to form strong rotation disturbance, so that an air dynamic field more suitable for combustion is formed in the furnace, and the disturbance of combustion air flow is enhanced.
In this embodiment, the number of the swirl straight blades 13 is 24, and two ends of the swirl straight blades 13 are respectively connected with the swirl inner ring 11 and the swirl outer ring 12; the swirl straight blades 13 are arranged at radial interval angles with the swirl inner ring 11. The shape of the blade grooves 131 should be spherical, the depth of the blade grooves 131 is smaller than one fourth of the thickness of the swirl straight blade 13, and the distance between the two blade grooves 131 is 3 to 5 times of the radius of the blade grooves 131. The parameters of the swirl vanes can be properly adjusted according to the actual working state, so that the mixing degree of the fuel gas and the air is enhanced, the combustion intensity is increased, and the purpose of reducing the generation of NOx is achieved.
The gas injection system 2 comprises a central gas injection gun 21 and a plurality of annular gas injection guns 22, wherein the annular gas injection guns 22 are arranged in a central symmetry way by taking the central gas injection gun 21 as the center; a boss 201 protrudes from the top ends of the central gas spray gun 21 and the annular gas spray gun 22, and the boss 201 is respectively arranged concentrically with the central gas spray gun 21 and the annular gas spray gun 22; a plurality of first diversion through holes 202 are uniformly formed in the circumferential direction of the boss 201 and the circumferential direction of the tail end of the central gas spray gun 21 connected with the boss 201; the first diversion through hole 202 is vertically and uniformly arranged with the central gas spray gun 21 in the axial direction, so that the gas is sprayed farther and more uniformly, and the strong disturbance of the cyclone 1 is added, so that the mixing of the gas and the air is facilitated, the local high temperature is avoided, and the emission of NOx is reduced. The boss 201 on the annular gas spray gun 22 and the annular gas spray gun 22 are circumferentially and uniformly provided with a plurality of second diversion through holes 203. The annular gas gun 22 is provided with the second diversion hole 203 facing the center, so that sufficient gas can be provided in the surrounding part, and the fluid movement in the head cover 33 is more compact when the gas passes through the blades of the cyclone 1.
The burner cylinder 3 is also provided with a gas inlet ring 36, and the gas inlet ring 36 is communicated with an annular gas inlet 31; the burner cylinder 3 is also connected to a primary gas inlet 32.
In this embodiment, a plurality of relief holes 142 are circumferentially formed in the through hole ring 14, the central gas lance 21 passes through the center of the inner swirl ring 11, and the annular gas lance 22 passes through the relief holes 142. The central gas lance 21 communicates with the primary gas inlet 32 and the annular gas lance 22 communicates with the gas inlet ring 36.
Compared with the method of igniting and burning by utilizing single injection channel air intake, the invention is based on the mode of multi-spray gun injection, the multi-strand fuel gas trickles are mixed, the air and fuel gas mixing is enhanced, the residence time of the flue gas in a high temperature area is shortened, the temperature of burning flame is reduced, and the generation of NOx during burning is effectively reduced.
When the work load demand is high, fuel gas can be introduced from the annular fuel gas inlet 31 to pass through the fuel gas inlet ring 36 and then distributed to enter the annular fuel gas spray gun 22 for spraying, and can be introduced from the main fuel gas inlet 32 to pass through the central fuel gas spray gun 21 and then sprayed out from the first diversion through hole 202; and when the workload demand is reduced, one of the two air inlets can be selected to carry out air inlet, so that the waste of fuel gas is prevented. The swirler 1 with the gas processed by the blades is mixed with air, so that the disturbance of the combustion air flow is improved, an aerodynamic field which is beneficial to continuous combustion is formed in the furnace, and the rapid ignition of the gas is realized, and the continuous, stable and sufficient combustion is realized. Wherein the plurality of pipes distribute the gas and ignite the mixed gas. The gas can be ignited quickly and timely, and other gas can form a good air force field with the gas in the burner, so that the combustion condition of the gas is stabilized, the combustion efficiency is improved, and the generation of NOx is effectively inhibited.
The structure and implementation of the cyclone 1 and the gas injection system 2 in the embodiment of the invention are tightly combined, and the separation of the gas is prevented by the turbulent layer formed by the special cyclone 1 under the condition of ensuring sufficient gas, so that the mixing quality of the gas and air is improved, stable flame is formed by improving the combustion quality, and the generation of NOx is inhibited.
The foregoing is only a preferred embodiment of the present invention, but the design concept of the present invention is not limited thereto, and any person skilled in the art will be able to make insubstantial modifications of the present invention within the scope of the present invention disclosed herein by this concept, which falls within the actions of invading the protection scope of the present invention.
Claims (8)
1. A multi-gun rotational flow type low-nitrogen burner is characterized by comprising a cyclone, a fuel gas injection system and a burner cylinder; the cyclone and the gas injection system are arranged in the combustor cylinder; the cyclone comprises a cyclone outer ring and a cyclone inner ring which are concentrically arranged, and a cyclone straight blade arranged between the cyclone outer ring and the cyclone inner ring; a plurality of blade grooves are formed in the rotational flow straight blades; the outer part of the rotational flow outer circular ring is also concentrically provided with a through hole circular ring, and a plurality of rotational flow through holes are arranged on the through hole circular ring;
The gas injection system comprises a central gas injection gun and a plurality of annular gas injection guns, wherein the annular gas injection guns are arranged in a central symmetry way by taking the central gas injection gun as the center; the top ends of the central gas spray gun and the annular gas spray gun are respectively provided with a boss in a protruding mode, and the bosses are respectively arranged concentrically with the central gas spray gun and the annular gas spray gun; a plurality of first diversion through holes are uniformly formed in the circumferential direction of the boss and the circumferential direction of the tail end of the central gas spray gun connected with the boss;
The burner cylinder is also provided with a gas inlet ring which is communicated with an annular gas inlet; the burner cylinder is also communicated with a main gas inlet.
2. The multi-gun swirl low-nitrogen burner of claim 1, wherein a plurality of relief holes are circumferentially provided in the through-hole annulus, the central gas lance passing through the center of the swirl inner annulus, the annular gas lance passing through the relief holes.
3. The multi-gun swirl low-nitrogen burner of claim 2 wherein two ends of swirl straight vanes are connected to the swirl inner and outer rings respectively; the rotational flow straight blades and the radial interval angle of the rotational flow inner circular ring are arranged.
4. A multi-gun swirl low nitrogen burner according to claim 3 wherein the vane grooves are spherically shaped, the vane grooves have a depth less than one quarter of the swirl straight vane thickness, the distance between two vane grooves being 3 to 5 times the vane groove radius.
5. The multi-gun swirl low-nitrogen burner of claim 4 wherein the surface of the swirl straight vanes forms a turbulent layer.
6. The multi-gun swirl low-nitrogen burner of claim 5, wherein the burner cylinder comprises a hood, a throat and a cylinder body which are arranged in sequence; the diameter of the throat opening gradually increases from the barrel body to the head cover; the throat and the head cover form a combustion chamber.
7. The multi-gun swirl low-nitrogen burner of claim 6, wherein the boss on the annular gas gun and the circumference of the annular gas gun are uniformly provided with a plurality of second split through holes.
8. The multi-gun swirl low nitrogen burner of claim 7 wherein said central gas gun communicates with said primary gas inlet and said annular gas gun communicates with said gas inlet ring.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011309827.2A CN112283706B (en) | 2020-11-20 | 2020-11-20 | Multi-gun spiral-flow type low-nitrogen combustor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011309827.2A CN112283706B (en) | 2020-11-20 | 2020-11-20 | Multi-gun spiral-flow type low-nitrogen combustor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112283706A CN112283706A (en) | 2021-01-29 |
| CN112283706B true CN112283706B (en) | 2024-05-14 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011309827.2A Active CN112283706B (en) | 2020-11-20 | 2020-11-20 | Multi-gun spiral-flow type low-nitrogen combustor |
Country Status (1)
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| CN (1) | CN112283706B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113339795A (en) * | 2021-05-31 | 2021-09-03 | 武汉理工大学 | Circumferential cyclone multistage premixing low-nitrogen combustor |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2753742Y (en) * | 2004-12-13 | 2006-01-25 | 查柏林 | Portable supersonic flame spraying device |
| WO2016162248A1 (en) * | 2015-04-08 | 2016-10-13 | Siemens Aktiengesellschaft | Burner arrangement |
| CN110715291A (en) * | 2019-10-24 | 2020-01-21 | 江苏徐工工程机械研究院有限公司 | Double-cyclone flame stabilizer and heavy oil burner |
| CN111089289A (en) * | 2019-12-03 | 2020-05-01 | 上海诺特飞博燃烧设备有限公司 | Multistage internal circulation low-nitrogen gas burner device |
| CN111520717A (en) * | 2020-04-09 | 2020-08-11 | 华侨大学 | Hierarchical low-nitrogen gas burner based on rotational flow |
| CN213872687U (en) * | 2020-11-20 | 2021-08-03 | 华侨大学 | Multi-gun cyclone type low-nitrogen burner |
-
2020
- 2020-11-20 CN CN202011309827.2A patent/CN112283706B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2753742Y (en) * | 2004-12-13 | 2006-01-25 | 查柏林 | Portable supersonic flame spraying device |
| WO2016162248A1 (en) * | 2015-04-08 | 2016-10-13 | Siemens Aktiengesellschaft | Burner arrangement |
| CN110715291A (en) * | 2019-10-24 | 2020-01-21 | 江苏徐工工程机械研究院有限公司 | Double-cyclone flame stabilizer and heavy oil burner |
| CN111089289A (en) * | 2019-12-03 | 2020-05-01 | 上海诺特飞博燃烧设备有限公司 | Multistage internal circulation low-nitrogen gas burner device |
| CN111520717A (en) * | 2020-04-09 | 2020-08-11 | 华侨大学 | Hierarchical low-nitrogen gas burner based on rotational flow |
| CN213872687U (en) * | 2020-11-20 | 2021-08-03 | 华侨大学 | Multi-gun cyclone type low-nitrogen burner |
Non-Patent Citations (2)
| Title |
|---|
| 低NO_x燃气燃烧器结构设计及性能试验;姬海民;李红智;姚明宇;聂剑平;;热力发电;20150225(02);全文 * |
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| CN112283706A (en) | 2021-01-29 |
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