CN212390351U - Dimethyl ether gas boiler combustor flue gas inner loop nitrogen reduction device - Google Patents
Dimethyl ether gas boiler combustor flue gas inner loop nitrogen reduction device Download PDFInfo
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- CN212390351U CN212390351U CN202021428128.5U CN202021428128U CN212390351U CN 212390351 U CN212390351 U CN 212390351U CN 202021428128 U CN202021428128 U CN 202021428128U CN 212390351 U CN212390351 U CN 212390351U
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Abstract
The utility model provides a dimethyl ether gas boiler combustor flue gas inner loop nitrogen reduction device, including the primary air pipe, the primary air pipe outside is equipped with the second grade tuber pipe, is equipped with the fuel pipe in the primary air pipe, is equipped with fuel first grade export and fuel second grade export on the fuel pipe, and fuel first grade export corresponds with the primary air pipe, and fuel second grade export corresponds with the second grade tuber pipe; and a smoke return port is arranged at one end of the secondary air pipe close to the outlet. The utility model inputs fuel in stages and mixes with the air input in stages, so as to disperse the temperature in the high temperature area, reduce the high temperature and reduce the generation of nitrogen oxide; the secondary air pipe is provided with the smoke return port, so that the combusted smoke is convoluted into the secondary air pipe to be combusted again, the generation of nitrogen oxides is further reduced, the smoke is recirculated, the heat capacity of the combusted smoke is large, the combustion temperature can be further reduced, and the generation of nitrogen oxides is further reduced.
Description
Technical Field
The utility model relates to a combustor technical field especially relates to a dimethyl ether gas boiler combustor flue gas inner loop nitrogen reduction device.
Background
Nitrogen oxides, mainly NO and NO, produced during combustion of fuel2，These two nitrogen oxides are commonly referred to as nitrogen oxides NOXAverage percentage of about 95%, and NO therein2Only about 5 percent. Nitrogen Oxides (NO)X) In the atmosphere, photochemical smog is generated through a series of physical and chemical reactions and sunlight, hydrocarbon, ozone and the like, so that the human health is harmed. Not only that, NOXMeanwhile, the method is also an important reason for forming acid rain, and is especially an important factor for generating the atmospheric ultrafine particulate matters (PM 2.5).
The low-nitrogen burner is NO in the process of fuel combustionXA burner with low emissions. How the burner reduces NOXIs discharged fromNitrogen Oxide (NO)X) The generation mechanism of (A) is that nitrogen in a nitrogen-containing compound generally exists in an atomic state during combustion of a fuel, the energy of a bonding bond is small, and nitrogen atoms are easily decomposed to be oxidized into NO during combustionXFrom N in the air2Generated by oxidation at high temperature, the higher the reaction temperature, the NOXThe faster the formation rate of (A), the flame temperature is lower than 1300 ℃, and NO is producedXRarely; at temperatures above 1500 ℃ NOXWill multiply; the higher the oxidation concentration, the higher the NOXThe greater the production; the longer the residence time in the high temperature zone, the NOXThe more production.
When the low-nitrogen combustion technology is improved, the temperature is mainly controlled, the flame temperature is reduced, particularly the peak temperature of the flame is reduced, the range of a high-temperature area of the flame is narrowed, fuel and air are combusted in a grading mode, and flue gas recirculation, internal circulation and external circulation full-premixing combustion are carried out.
SUMMERY OF THE UTILITY MODEL
To foretell technical problem, the utility model provides a dimethyl ether gas boiler combustor flue gas inner loop nitrogen reduction device for solve among the prior art the higher problem of NOX's emission in the fuel combustion process.
In order to achieve the above purpose, the technical solution of the present invention is realized as follows:
a dimethyl ether gas boiler burner smoke internal circulation nitrogen reduction device comprises a primary air pipe, a secondary air pipe and a fuel pipe, wherein the secondary air pipe is arranged on the outer side of the primary air pipe, the fuel pipe comprises a fuel inlet pipe and a fuel outlet pipe which are communicated, the fuel outlet pipe is arranged on the inner side of the primary air pipe, the fuel inlet pipe sequentially penetrates through the primary air pipe and the secondary air pipe, the outlet end of the fuel outlet pipe is connected with a grading outlet pipe, a primary fuel outlet and a secondary fuel outlet are arranged on the grading outlet pipe, the primary fuel outlet corresponds to the primary air pipe, and the secondary fuel outlet corresponds to the secondary; and a smoke return port is arranged at one end of the secondary air pipe, which is close to the outlet.
Furthermore, the grading outlet pipe comprises an outer pipe coaxially connected with the fuel outlet pipe, at least three primary fuel outlets are arranged, and the three primary fuel outlets are uniformly distributed on the side wall of the outer pipe.
Furthermore, an inner pipe is arranged in the outer pipe, the inner pipe extends out of the outer pipe and then is divided into a plurality of branch pipes, and the fuel secondary outlet is formed in the outlet end of each branch pipe.
Furthermore, a spoiler is arranged at one end, close to the primary fuel outlet, of the outer pipe, and corresponds to the outlet end of the primary air pipe.
Furthermore, the spoiler is rotatably connected to the outer pipe through a bearing and is positioned between the primary outlet of the fuel and the outlet end of the primary air pipe.
Furthermore, a spoiler is arranged between the secondary air pipe and the primary air pipe.
Furthermore, the number of the smoke return openings is six, and the six smoke return openings are uniformly distributed on the side wall of one end, close to the outlet, of the secondary air pipe.
The utility model has the advantages that: the utility model inputs fuel in stages and mixes with the air input in stages, so as to disperse the temperature in the high temperature area, reduce the high temperature and reduce the generation of nitrogen oxide; the secondary air pipe is provided with the smoke return port, so that the combusted smoke is convoluted into the secondary air pipe to be combusted again, the generation of nitrogen oxides is further reduced, the smoke is recirculated, the heat capacity of the combusted smoke is large, the combustion temperature can be further reduced, and the generation of nitrogen oxides is further reduced.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic top view of the present invention;
fig. 2 is a cross-sectional structural view of fig. 1.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without any creative effort belong to the protection scope of the present invention.
As shown in figures 1 and 2, the dimethyl ether gas boiler burner smoke internal circulation nitrogen reduction device of the utility model comprises a primary air pipe 1, a secondary air pipe 2 and a fuel pipe 3, wherein the inlet end of the primary air pipe 1 is connected with a primary fan 5 for introducing primary air into the burner, the secondary air pipe 2 is arranged outside the primary air pipe 1, the secondary air pipe 2 and the fuel pipe 3 are coaxially arranged, one side of the secondary air pipe 2 is provided with a secondary air inlet pipe and is connected with a secondary fan 6 through the secondary air inlet pipe for introducing secondary air into the burner, the fuel pipe 3 comprises a fuel inlet pipe 31 and a fuel outlet pipe 32 which are communicated, the fuel outlet pipe 32 is arranged inside the primary air pipe 1, the fuel inlet pipe 31 sequentially passes through the primary air pipe 1 and the secondary air pipe 2, the inlet end of the fuel inlet pipe 31 is connected with a dimethyl ether gas source for, the outlet end of the fuel outlet pipe 32 is connected with a graded outlet pipe 33, and a primary fuel outlet 331 and a secondary fuel outlet 332 are arranged on the graded outlet pipe 33; the primary fuel outlet 31 corresponds to the outlet end of the primary air pipe 1, and the dimethyl ether fuel gas output by the primary fuel outlet 31 is premixed with the air output by the primary air pipe 1 at the outlet of the primary air pipe 1, so that the temperature of flame can be reduced, and the generation of nitrogen oxides is reduced; the secondary fuel outlet 32 corresponds to the secondary air pipe 2, specifically, in this embodiment, the outlet end of the secondary air pipe 2 is longer than the primary air pipe 1, the fuel is dimethyl ether, the secondary fuel outlet 32 of the grading outlet pipe 33 extends to the secondary air pipe 2, so that the fuel output from the secondary fuel outlet 32 can be premixed with the secondary air input from the secondary air pipe 2, the flame temperature can be further reduced, especially the flame peak temperature can be reduced, the range of the high-temperature region of the flame can be reduced, and the generation of nitrogen oxides can be reduced; the fuel secondary outlet 32 is positioned at the outer ring of the fuel primary outlet 31, so that the fuel is input in a grading way and is premixed with the air input in the grading way, and the aim of dispersing the temperature of a high-temperature area is fulfilled; one end that is close to the export on the secondary air pipe 2 is equipped with back smoke mouth 22, because the inboard fuel mixed air of 2 exit ends of secondary air pipe burns the back, 2 inboard atmospheric pressure of secondary air pipe can be less than the 2 outsides of secondary air pipe slightly, the flue gas that burns can follow back smoke mouth 22 at the 2 outsides of secondary air pipe and circle round and get into 2 inboards and secondary air of secondary air pipe, 32 exhaust fuel of fuel secondary outlet carries out the reburning, further reduce nitrogen oxide's production, and the flue gas recirculation, the thermal capacity of burning flue gas is big, can make the combustion temperature further reduce, further reduce nitrogen oxide's production.
Further, as shown in fig. 1 and 2, the staged outlet pipe 33 includes an outer pipe 333 coaxially connected to the fuel outlet pipe 32, the number of the primary fuel outlets 331 is at least three, the three primary fuel outlets 331 are uniformly distributed on a side wall of the outer pipe 333, and the primary fuel outlets 331 communicate with the inside of the fuel pipe 3. In this embodiment, the outlet ends of the fuel pipes 3 are set to three, and the temperature of the single flame is as high as more than 1500 ℃, and the combustion temperature of the flame with three holes is not more than 1300 ℃, so that the high temperature can be reduced, the generation of nitrogen oxides can be reduced, and the efficiency in the furnace chamber is not reduced.
Further, as shown in fig. 1, an inner pipe 334 is provided inside the outer pipe 333, the inner pipe 334 extends out of the outer pipe 333 and is divided into a plurality of branch pipes, and the fuel secondary outlet 332 is provided at an outlet end of the branch pipes. Specifically, a part of the inner tube 334 is located inside the outer tube 333 and is coaxially arranged with the outer tube 333, another part of the inner tube 334 extends out of the outer tube 333 and is divided into a plurality of branch tubes, the branch tubes are in arc transition with the inner tube 334, the end parts of the inner tube 334 and the outer tube 333 are fixed, the branch tubes extend along the radial direction of the combustion tube 3, the fuel secondary outlet 332 is arranged at the outlet end of the branch tubes, the inner tube 334 is an airflow channel of the fuel secondary outlet 332, and an airflow channel of the fuel primary outlet 331 is arranged between the inner tube 334 and the outer tube 333. In the present embodiment, the portion of the inner pipe 333 extending out of the fuel pipe 3 is divided into six branch pipes, and accordingly, there are six secondary fuel outlets 332, and preferably, there are also six primary fuel outlets 331, and the six primary fuel outlets 331 and the six branch pipes are arranged to intersect with each other in a plan view projection of the fuel pipe 3, so that the branch pipes do not obstruct combustion of the fuel discharged from the primary fuel outlets 331.
Further, as shown in fig. 1, a spoiler 4 is disposed at one end of the outer tube 333 close to the primary fuel outlet 331, and the spoiler 4 corresponds to the outlet end of the primary air duct 1, at the outlet end of the primary air duct 1, the fuel is mixed with the primary air, and the spoiler 4 provides swirling air flow, thereby effectively promoting gas mixing and flame stable combustion.
Further, as shown in fig. 1, the spoiler 4 is rotatably connected to the outer tube 333 through a bearing 41, and the spoiler 4 is located between the primary fuel outlet 331 and the outlet end of the primary air duct 1, so that the spoiler 4 rotates under the action of the air flow, and the swirling effect and the combustion stabilizing effect are improved.
Further, as shown in fig. 1, a plurality of spoilers 21 are disposed between the secondary air duct 2 and the primary air duct 1, the spoilers 21 are uniformly arranged on the outer wall of the primary air duct 1 in a spiral shape, and the secondary air enters the combustion area through the spoilers 21, so that a better staged combustion effect can be obtained, and the temperature of the flame center can be reduced. When the air-conditioner is installed, the spoiler 21 is fixed on the outer wall of the primary air pipe 1 and then sleeved into the secondary air pipe 2.
Further, as shown in fig. 1, six smoke-returning openings 22 are provided, and the six smoke-returning openings 22 are uniformly distributed on the side wall of the secondary air duct 2 near one end of the outlet, so that the cigarette ash outside the secondary air duct 2 can be conveniently swirled into the secondary air duct 2 to be combusted, in this embodiment, the six smoke-returning openings 22 are provided on the part of the secondary air duct 2, which is longer than the primary air duct 1, and the part of the secondary air duct 2, which is longer than the primary air duct 1, forms a mixing area of fuel and air.
In the embodiment, the diameter of the secondary air pipe 2 is 220mm, the inner diameter of the primary air pipe 1 is 120mm, the inner diameter of the combustion pipe 3 is 60mm, the inner diameter of the outer pipe 333 is 60mm, the aperture of the primary fuel outlet 331 is 25mm, and the inner diameter of the branch pipe is 25mm, so that the inner diameter of the secondary fuel outlet 32 is 25 mm; beijing, Shanghai oxynitride (NO)X) Emission standard: combustor developed by our company with less than 30 mg per cubic meterNitrogen Oxide (NO) after half a month testingX) 25 mg, the thermal efficiency is not reduced.
The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. The dimethyl ether gas boiler burner smoke internal circulation nitrogen reduction device is characterized by comprising a primary air pipe (1), a secondary air pipe (2) and a fuel pipe (3), wherein the secondary air pipe (2) is arranged on the outer side of the primary air pipe (1), the fuel pipe (3) comprises a fuel inlet pipe (31) and a fuel outlet pipe (32) which are communicated, the fuel outlet pipe (32) is arranged on the inner side of the primary air pipe (1), the fuel inlet pipe (31) sequentially penetrates through the primary air pipe (1) and the secondary air pipe (2), the outlet end of the fuel outlet pipe (32) is connected with a grading outlet pipe (33), a primary fuel outlet (331) and a secondary fuel outlet (332) are arranged on the grading outlet pipe (33), the primary fuel outlet (331) corresponds to the primary air pipe (1), and the secondary fuel outlet (332) corresponds to the secondary air pipe (2); and a smoke return port (22) is arranged at one end of the secondary air pipe (2) close to the outlet.
2. The dimethyl ether gas boiler burner smoke internal circulation nitrogen reduction device of claim 1, characterized in that the classification outlet pipe (33) comprises an outer pipe (333) coaxially connected with the fuel outlet pipe (32), the number of the primary fuel outlets (331) is at least three, and the three primary fuel outlets (331) are uniformly distributed on the side wall of the outer pipe (333).
3. The dimethyl ether gas boiler burner smoke internal circulation nitrogen reduction device of claim 2, characterized in that the inner part of the outer pipe (333) is provided with an inner pipe (334), the inner pipe (334) extends out of the outer pipe (333) and is divided into a plurality of branch pipes, and the secondary fuel outlet (332) is arranged at the outlet ends of the branch pipes.
4. The dimethyl ether gas boiler burner smoke internal circulation nitrogen reduction device according to claim 2 or 3, characterized in that a turbulence generator (4) is arranged at one end of the outer pipe (333) close to the primary fuel outlet (331), and the turbulence generator (4) corresponds to the outlet end of the primary air pipe (1).
5. The dimethyl ether gas boiler burner smoke internal circulation nitrogen reduction device according to claim 4, characterized in that the turbulence generator (4) is rotatably connected to the outer pipe (333) through a bearing (41), and the turbulence generator (4) is positioned between the primary fuel outlet (331) and the outlet end of the primary air pipe (1).
6. The dimethyl ether gas boiler burner smoke internal circulation nitrogen reduction device according to claim 1 or 5, characterized in that a spoiler (21) is arranged between the secondary air pipe (2) and the primary air pipe (1).
7. The dimethyl ether gas boiler burner smoke internal circulation nitrogen reduction device of claim 6, characterized in that six smoke return ports (22) are provided, and the six smoke return ports (22) are uniformly distributed on the side wall of the secondary air pipe (2) near one end of the outlet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021428128.5U CN212390351U (en) | 2020-07-20 | 2020-07-20 | Dimethyl ether gas boiler combustor flue gas inner loop nitrogen reduction device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021428128.5U CN212390351U (en) | 2020-07-20 | 2020-07-20 | Dimethyl ether gas boiler combustor flue gas inner loop nitrogen reduction device |
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| Publication Number | Publication Date |
|---|---|
| CN212390351U true CN212390351U (en) | 2021-01-22 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021428128.5U Active CN212390351U (en) | 2020-07-20 | 2020-07-20 | Dimethyl ether gas boiler combustor flue gas inner loop nitrogen reduction device |
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|---|---|
| CN (1) | CN212390351U (en) |
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- 2020-07-20 CN CN202021428128.5U patent/CN212390351U/en active Active
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