CN212492408U - High-temperature ammonia-spraying denitration spray gun for coal-fired boiler - Google Patents
High-temperature ammonia-spraying denitration spray gun for coal-fired boiler Download PDFInfo
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- CN212492408U CN212492408U CN202020763541.0U CN202020763541U CN212492408U CN 212492408 U CN212492408 U CN 212492408U CN 202020763541 U CN202020763541 U CN 202020763541U CN 212492408 U CN212492408 U CN 212492408U
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- Prior art keywords
- spray gun
- sleeve
- cooling air
- coal
- nozzle body
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- 239000007921 spray Substances 0.000 title claims abstract description 52
- 238000005507 spraying Methods 0.000 title claims abstract description 12
- 238000001816 cooling Methods 0.000 claims abstract description 46
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims abstract description 24
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 19
- 229910021529 ammonia Inorganic materials 0.000 claims abstract description 12
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 6
- 239000003546 flue gas Substances 0.000 claims abstract description 6
- 238000000889 atomisation Methods 0.000 claims description 19
- 238000002347 injection Methods 0.000 claims description 7
- 239000007924 injection Substances 0.000 claims description 7
- 239000011148 porous material Substances 0.000 claims description 7
- 239000000243 solution Substances 0.000 claims description 7
- 238000003780 insertion Methods 0.000 claims description 2
- 230000037431 insertion Effects 0.000 claims description 2
- 239000000446 fuel Substances 0.000 abstract description 7
- 239000003245 coal Substances 0.000 abstract description 5
- 238000005516 engineering process Methods 0.000 description 11
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 9
- 125000002924 primary amino group Chemical group [H]N([H])* 0.000 description 6
- 230000000694 effects Effects 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 230000002950 deficient Effects 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 description 1
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 description 1
- 235000011114 ammonium hydroxide Nutrition 0.000 description 1
- 239000004202 carbamide Substances 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
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- Treating Waste Gases (AREA)
Abstract
The utility model provides a coal fired boiler high temperature spouts ammonia denitration spray gun, simple structure, reasonable in design, convenient to use can use under the high temperature condition in rich fuel district. The spray gun comprises a spray gun rod, a spray head arranged at one end of the spray gun rod and a fixing component coaxially sleeved at the other end of the spray gun rod; the spray head is used for atomizing the reducing agent solution and then spraying the reducing agent solution into the flue gas; the fixing assembly comprises a pipe seat, a cooling wind box and a sleeve; the inner side of the sleeve is coaxially sleeved on the spray gun rod; one end of the cooling air box is fixedly connected with the pipe seat, and a cavity is enclosed by the inner side of the cooling air box and the outer side of the sleeve to serve as a cooling air chamber; an annular slit which is adjacent to and coaxial with the spray gun rod is arranged at the joint of one end of the pipe seat between the sleeve and the cooling air box; and a compressed air interface communicated with the cooling air chamber is arranged on the side wall of the cooling air box.
Description
Technical Field
The utility model relates to a coal fired boiler spray gun specifically is a coal fired boiler high temperature spouts ammonia denitration spray gun.
Background
In recent years, the emission requirement of nitrogen oxides of coal-fired power plants is more and more strict, and the emission of nitrogen oxides of coal-fired units is required to be less than 50mg/m3And the requirement of a newly built unit can be met or approached. And some key areas require that the concentration of nitrogen oxide emissions cannot exceed 30mg/m3。
The existing control measures for NOx emission of thermal power plants are generally divided into two categories: one is to control the generation of NOx during the combustion process in the furnace, such as low nitrogen burner technology, air staging technology, reburning technology, etc.; the other is a boiler tail flue gas treatment method, including SNCR technology, SCR technology and the like. As NOx emission targets become more stringent, new denitration measures are needed to provide technical support.
The high-temperature ammonia spraying technology in the fuel-rich area is an advanced technology for removing NOx in a furnace. Wendt et al first proposed a concept of injecting ammonia into a fuel-rich zone in the 70 s of the 20 th century, and the denitration principle thereof was to create a high-temperature oxygen-deficient environment in a main combustion zone in a furnace, and to inject an amino reducing agent such as urea or ammonia water to react with NOx to generate N2Thereby realizing the reduction removal of NOx. The fuel rich zone is high compared to SCR technologyThe warm ammonia spraying technology does not need to use a catalyst, so that the investment and maintenance cost is greatly reduced; compared with SNCR technology, NH does not exist because the amino reducing agent is sprayed in the fuel-rich and oxygen-deficient environment3The oxidized condition and the utilization rate of the reducing agent are high.
The high-temperature ammonia injection technology in the fuel-rich area obtains higher denitration efficiency in a laboratory, but is not popularized and applied in the actual production process. The reason is as follows: the technology has high requirement on the injection condition of the amino reducing agent, needs a high-temperature oxygen-free environment, and is difficult for the existing equipment to meet the use requirement, particularly the existing spray gun cannot accurately inject the amino reducing agent to the area meeting the high-temperature ammonia injection denitration reaction condition in the high-temperature environment.
SUMMERY OF THE UTILITY MODEL
To the problem that exists among the prior art, the utility model provides a coal fired boiler high temperature spouts ammonia denitration spray gun, simple structure, reasonable in design, convenient to use can use under the high temperature condition in rich fuel district.
The utility model discloses a realize through following technical scheme:
a high-temperature ammonia-spraying denitration spray gun for a coal-fired boiler comprises a spray gun rod, a spray head arranged at one end of the spray gun rod and a fixing component coaxially sleeved at the other end of the spray gun rod;
the spray head is used for atomizing the reducing agent solution and then spraying the reducing agent solution into the flue gas;
the fixing assembly comprises a pipe seat, a cooling wind box and a sleeve; the inner side of the sleeve is coaxially sleeved on the spray gun rod; one end of the cooling air box is fixedly connected with the pipe seat, and a cavity is enclosed by the inner side of the cooling air box and the outer side of the sleeve to serve as a cooling air chamber; an annular slit which is adjacent to and coaxial with the spray gun rod is arranged at the joint of one end of the pipe seat between the sleeve and the cooling air box; and a compressed air interface communicated with the cooling air chamber is arranged on the side wall of the cooling air box.
Preferably, the cooling wind box is arranged in a concave shape, and the sleeve is inserted into and fixedly matched with the concave opening; the outer side of the insertion end of the sleeve is arranged in a groove, and the groove and the bottom of the cooling wind box form an annular slit with a gradually reduced outlet.
Preferably, the cooling wind box is in threaded connection with the outer side of the sleeve at the concave opening, and the outer side of the bottom of the cooling wind box is in threaded connection with the pipe seat.
Preferably, the spray head comprises a nozzle body, an atomization plate and a nozzle cap;
the nozzle body is fixed on the spray gun rod and is provided with a pore passage communicated with the reducing agent passage of the spray gun rod;
one end of the nozzle cap is opened, the other end of the nozzle cap is connected to the nozzle body through threads, and the atomizing plate is clamped and fixed on the nozzle body by the nozzle cap; the center of the atomization plate is provided with an atomization through hole, one end of the atomization plate connected with the nozzle body is provided with a shallow groove respectively communicated with the pore channel and the atomization through hole, and the other end of the atomization plate is communicated with the opening of the nozzle cap through the atomization through hole.
Preferably, one end of the nozzle body is sleeved and connected on the spray gun rod through threads, and the other end of the nozzle body is inserted into the nozzle cap through threads.
Preferably, the outer side of the shallow groove is communicated with the pore passage, and the middle of the shallow groove is communicated with the atomization through hole.
Compared with the prior art, the utility model discloses following profitable technological effect has:
the utility model discloses a fixed subassembly that sets up, when can fixing the spray gun at the boiler lateral wall, on the one hand establish sliding connection's sleeve through coaxial cover and guarantee its slip flexible in fixed subassembly, on the other hand carries out high-pressure air seal's time through the cyclic annular slit that sets up on the cooling plenum, can form the cooling air membrane with the outer wall flow of cooling air along the spray gun barral of a gun, play the cooling effect of extension, cooperate the cooling of inside liquid amino reducing agent, thereby can accurately spray the region that satisfies high temperature ammonia-spraying denitration reaction condition with amino reducing agent.
Drawings
Fig. 1 is a schematic view of a spray gun according to an embodiment of the present invention.
Fig. 2 is a schematic structural view of a fixed end of a spray gun according to an embodiment of the present invention.
Fig. 3 is a schematic structural view of a nozzle end of a spray gun according to an embodiment of the present invention.
In the figure: the device comprises a pipe seat 1, a cooling wind box 2, a sleeve 3, a compressed air interface 4, a nozzle body 5, an atomization plate 6, a shallow groove 61, a nozzle cap 7, a pore passage 8, a spray gun rod 9, a reducing agent interface 10, a spray head 11 and a boiler wall 12.
Detailed Description
The present invention will now be described in further detail with reference to specific examples, which are intended to be illustrative, but not limiting, of the invention.
The utility model relates to a coal fired boiler high temperature ammonia injection denitration spray gun, as shown in figure 1, one end of the spray gun is a fixed end, is positioned outside the boiler, and is fixed on the boiler wall 12 through a tube seat 1; the other end is a nozzle end which is provided with a nozzle 11 and is positioned in the flue gas at the inner side of the boiler to atomize the reducing agent solution and then spray the reducing agent solution into the flue gas.
The fixed end structure is shown in fig. 2 and comprises a pipe seat 1, a cooling wind box 2 and a sleeve 3. The pipe seat 1 is welded on the boiler wall 12 and connected with the cooling wind box 2 through threads, and the cooling wind box 2 is fixed. The cooling wind box 2 is provided with a compressed air interface 4, and the cooling wind box 2 is in threaded connection with the sleeve 3. The interior of the sleeve 3 is a passage for the lance rod 9 to enter and exit the boiler. A cavity is enclosed by the sleeve 3 and the cooling air box 2 to serve as an air chamber of cooling air, the cooling air is taken from compressed air, enters the cooling air chamber through a compressed air interface, is sprayed into the furnace through an annular slit reserved between the sleeve 3 and the cooling air box 2, flows along the outer wall of the spray gun rod 9, plays a certain role in cooling, and has a certain sealing effect.
The nozzle end structure is shown in fig. 3 below and includes a nozzle body 5, an atomization plate 6, and a nozzle cap 7. The nozzle body 5 is connected to the lance shank 9 by means of a thread. The nozzle cap 7 is connected to the nozzle body 5 by a screw thread. The atomization plate 6 is located between the nozzle cap 7 and the nozzle body 5 and is clamped and fixed by the nozzle cap 7 and the nozzle body 5. The reducing agent solution reaches the spray head 11 through the spray gun rod 9, enters the shallow groove 61 of the atomization plate 6 through the pore canal 8 on the spray head body, and is sprayed out from the opening at the center of the atomization plate 6 to be atomized.
Claims (6)
1. A high-temperature ammonia-spraying denitration spray gun of a coal-fired boiler is characterized by comprising a spray gun rod (9), a spray head (11) arranged at one end of the spray gun rod (9) and a fixing component coaxially sleeved at the other end;
the spray head (11) is used for atomizing the reducing agent solution and then spraying the reducing agent solution into the flue gas;
the fixed assembly comprises a pipe seat (1), a cooling wind box (2) and a sleeve (3); the inner side of the sleeve (3) is coaxially sleeved on the spray gun rod (9); one end of the cooling air box (2) is fixedly connected with the pipe seat (1), and a cavity is enclosed by the inner side of the cooling air box (2) and the outer side of the sleeve (3) to be used as a cooling air chamber; an annular slit which is adjacent to and coaxial with the spray gun rod (9) is arranged at the joint of one end of the pipe seat (1) between the sleeve (3) and the cooling air box (2); the side wall of the cooling wind box (2) is provided with a compressed air interface (4) communicated with the cooling wind chamber.
2. The high-temperature ammonia injection and denitration spray gun of the coal-fired boiler according to claim 1, characterized in that the cooling air box (2) is arranged in a concave shape, and the sleeve (3) is inserted and fixedly matched with the concave opening; the outer side of the insertion end of the sleeve (3) is provided with a groove, and the groove and the bottom of the cooling wind box (2) form an annular slit with a gradually reduced outlet.
3. The high-temperature ammonia injection and denitration lance for the coal-fired boiler according to claim 1, wherein the cooling air box (2) is in threaded connection with the outer side of the sleeve (3) at the concave opening, and the outer side of the bottom of the cooling air box (2) is in threaded connection with the pipe seat (1).
4. The high-temperature ammonia injection denitration lance for the coal-fired boiler according to claim 1, wherein the nozzle head (11) comprises a nozzle body (5), an atomization plate (6) and a nozzle cap (7);
the nozzle body (5) is fixed on the spray gun rod (9), and a pore passage (8) communicated with a reducing agent passage of the spray gun rod (9) is arranged on the nozzle body (5);
one end of the nozzle cap (7) is opened, the other end of the nozzle cap is connected to the nozzle body (5) through threads, and the atomizing plate (6) is clamped and fixed on the nozzle body (5) through the nozzle cap (7); an atomization through hole is formed in the center of the atomization plate (6), one end of the connection nozzle body (5) is provided with a shallow groove (61) which is respectively communicated with the pore channel (8) and the atomization through hole, and the other end of the connection nozzle body is communicated with an opening of the nozzle cap (7) through the atomization through hole.
5. The high-temperature ammonia-spraying denitration lance for the coal-fired boiler according to claim 1, wherein one end of the nozzle body (5) is connected to the lance rod (9) through a threaded sleeve, and the other end is inserted into the connecting nozzle cap (7) through a thread.
6. The high-temperature ammonia-spraying denitration lance for the coal-fired boiler according to claim 4, characterized in that the outer side of the shallow groove (61) is communicated with the duct (8), and the middle of the shallow groove is communicated with the atomization through hole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020763541.0U CN212492408U (en) | 2020-05-09 | 2020-05-09 | High-temperature ammonia-spraying denitration spray gun for coal-fired boiler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020763541.0U CN212492408U (en) | 2020-05-09 | 2020-05-09 | High-temperature ammonia-spraying denitration spray gun for coal-fired boiler |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212492408U true CN212492408U (en) | 2021-02-09 |
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ID=74445895
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020763541.0U Active CN212492408U (en) | 2020-05-09 | 2020-05-09 | High-temperature ammonia-spraying denitration spray gun for coal-fired boiler |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212492408U (en) |
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2020
- 2020-05-09 CN CN202020763541.0U patent/CN212492408U/en active Active
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| GR01 | Patent grant |