CN212680586U - Ammonia spraying denitration device in furnace - Google Patents
Ammonia spraying denitration device in furnace Download PDFInfo
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- CN212680586U CN212680586U CN202021051080.0U CN202021051080U CN212680586U CN 212680586 U CN212680586 U CN 212680586U CN 202021051080 U CN202021051080 U CN 202021051080U CN 212680586 U CN212680586 U CN 212680586U
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Abstract
The utility model discloses a denitration device for spraying ammonia in a furnace, which comprises an ammonia spraying part and a denitration reactor, wherein the ammonia spraying part comprises an ammonia storage tank, an ammonia spraying pump and an ammonia spraying device arranged in a hearth of the boiler, and the ammonia spraying device comprises an ammonia distribution pipe arranged at the top of the hearth and a first nozzle arranged at the inner side of the ammonia distribution pipe; the inlet and the outlet of the ammonia spraying pump are respectively connected with the ammonia storage tank and the ammonia distributing pipe; an air preheater and an economizer are arranged in a smoke exhaust channel of the boiler, a partition plate divides the space between the air preheater and the economizer into a smoke exhaust cavity and a smoke inlet cavity, and the smoke exhaust cavity is positioned on the upper side of the smoke inlet cavity; the inlet of the denitration reactor is connected to the smoke exhaust cavity through a connecting air duct, and the outlet of the denitration reactor is connected to the smoke inlet cavity through a return air duct. In this application, set up the cloth ammonia pipe at the furnace top, when the flue gas in the furnace upwards discharged furnace, through the space that the cloth ammonia pipe encloses, make the ammonia can enter into the flue gas rapidly in, improve denitration efficiency.
Description
Technical Field
The utility model relates to a spout ammonia denitrification facility in stove.
Background
The ammonia has good denitration performance and is widely used for denitration of boiler flue gas, ammonia gas or ammonia water serving as a denitration agent is injected into an inlet of an SCR denitration reactor and enters the reactor together with the flue gas to react, and nitrogen oxides in the flue gas are reduced into nitrogen gas, but due to the problems of flue gas flow velocity, catalyst efficiency, content of nitrogen oxides in the flue gas and the like, a certain amount of ammonia cannot react, the ammonia enters subsequent equipment of the denitration reactor along with the flue gas to cause ammonia escape, in order to reduce the ammonia escape, the ammonia water or ammonia gas is injected into a hearth to form an SNCR and SCR combined denitration process, but because the flue gas flow velocity in the hearth is large, the ammonia water or ammonia gas cannot be fully mixed with the flue gas, and further improvement of denitration efficiency of the combined denitration process is restricted.
SUMMERY OF THE UTILITY MODEL
In order to solve the problems, the utility model provides an ammonia spraying and denitration device in a furnace, which comprises an ammonia spraying part and a denitration reactor, wherein the ammonia spraying part comprises an ammonia storage tank, an ammonia spraying pump and an ammonia spraying device arranged in a hearth of the boiler, the ammonia spraying device comprises an ammonia distribution pipe and a first nozzle which are arranged at the top of the hearth, the ammonia distribution pipe extends along the inner wall of the hearth in the horizontal direction and is annular, the first nozzle is arranged at the inner side of the ammonia distribution pipe, and a jet orifice of the first nozzle faces to the annular center of the ammonia distribution pipe; the inlet of the ammonia spraying pump is connected to the ammonia storage tank, and the outlet of the ammonia spraying pump is communicated with the ammonia distribution pipe;
the smoke exhaust port of the boiler is connected with a downward extending smoke exhaust channel, an air preheater and an economizer are arranged in the smoke exhaust channel, the air preheater and the economizer are arranged at intervals in the vertical direction, the economizer is positioned on the upper side of the air preheater, a partition plate is arranged between the air preheater and the economizer and divides the space between the air preheater and the economizer into a smoke exhaust cavity and a smoke inlet cavity, and the smoke exhaust cavity is positioned on the upper side of the smoke inlet cavity;
the inlet of the denitration reactor is connected to the smoke exhaust cavity through a connecting air duct, and the outlet of the denitration reactor is connected to the smoke inlet cavity through a return air duct.
In this application, set up the cloth ammonia pipe at the furnace top, the cloth ammonia pipe extends along furnace's inner wall, and first nozzle setting is in the inboard of cloth ammonia pipe to towards the annular center of cloth ammonia pipe, when the flue gas in the furnace upwards discharged furnace, through the space that cloth ammonia pipe encloses, make from first nozzle spun ammonia can enter into the flue gas rapidly in, utilize the high temperature of flue gas to react, nitrogen oxide in the desorption flue gas. Because the ammonia gas layer is formed at the top of the hearth by the ammonia gas discharged from the first nozzle, the ammonia gas can be absorbed by the flue gas when the flue gas is discharged out of the hearth, and the problem that the ammonia gas cannot uniformly enter the flue gas due to overlarge flow speed of the flue gas is avoided.
Further, in order to improve the denitration rate of the flue gas, the connection air channel extends along the horizontal direction, a second nozzle is installed in the connection air channel, and the second nozzle is communicated with an outlet of the ammonia spraying pump. Further, the second nozzle is directed in a direction opposite to the flow direction of the flue gas.
After the second nozzle is installed in the connection air channel, partial ammonia gas can be supplemented into the flue gas according to the specific denitration condition, so that the shortage of the total amount of the denitration agent in the flue gas is made up, and the denitration efficiency is ensured.
Further, in order to improve the ammonia gas that enters into in the contact air duct through the second nozzle and can distribute the flue gas more evenly, install static mixer in this contact air duct, after installing static mixer, can also improve the homogeneity of flue gas temperature, in the contact air duct, the temperature of the partial flue gas that is close to contact air duct inner wall can be lower than the central zone's flue gas temperature, after setting up static mixer, be favorable to the flue gas misce bene, make the flue gas temperature more even, be favorable to the homogeneity of denitration reaction, in order to improve the denitration rate.
Further, this denitration reactor sets up along vertical direction, and denitration reactor's export is towards the below, installs a riser in denitration reactor's export, and on the lateral wall of this return air hose was connected to the riser, the other end of return air hose was connected to into the smoke chamber, and the lower extreme of this riser is provided with the ash discharge mouth, installs the slide valve that is used for discharging the dust at the ash discharge mouth. The settled smoke dust in the vertical pipe can be discharged from the ash discharge port, the content of the smoke dust in the smoke gas is reduced, the abrasion to the air preheater can be reduced, and the burden of a subsequent dust remover can also be reduced.
Drawings
Fig. 1 is a schematic structural diagram of an embodiment of the present invention.
Detailed Description
Referring to fig. 1, an ammonia injection and denitration apparatus in a furnace comprises an ammonia injection part and a denitration reactor 30, wherein the ammonia injection part comprises an ammonia storage tank 11, an ammonia injection pump 12 and an ammonia injector 22 installed in a hearth 21 of a boiler 20, the ammonia injector 22 comprises an ammonia distribution pipe 223 and a first nozzle 221, the ammonia distribution pipe 223 is arranged at the top of the hearth, the ammonia distribution pipe 223 extends along the inner wall of the hearth in the horizontal direction and is annular, the first nozzle 221 is installed at the inner side of the ammonia distribution pipe 223,
the injection port of the first nozzle 221 is directed toward the center of the ring of the ammonia distribution pipe, and an ammonia inlet pipe 222 is connected to the ammonia distribution pipe in the horizontal direction and is fixedly installed on the furnace wall 23 of the boiler 20.
The inlet of the ammonia injection pump 12 is connected to the ammonia storage tank 11, the outlet of the ammonia injection pump 12 is connected with two branch pipes, one branch pipe is a furnace branch pipe 14, the other branch pipe is an air duct branch pipe 13, and the furnace branch pipe is connected to the ammonia inlet pipe 222.
The exhaust port of the boiler 20 is connected with a downwardly extending exhaust flue 29, an air preheater 26 and an economizer 24 are disposed in the exhaust flue 29, the air preheater 26 and the economizer 24 are vertically spaced apart from each other, and the economizer 24 is disposed on the upper side of the air preheater 26.
A partition 25 is provided between the air preheater 26 and the economizer 24, the partition 25 dividing the space between the air preheater and the economizer into a smoke discharge chamber 27 and a smoke inlet chamber 28. The smoke exhaust chamber 27 is located at an upper side of the smoke inlet chamber 28.
In this embodiment, the denitration reactor 30 is arranged along the vertical direction, the denitration reactor 30 includes a housing 311 extending along the vertical direction, three catalyst bed layers 31 are arranged along the vertical direction in the housing 311, the upper end of the housing 311 is formed as the outlet of the denitration reactor, the lower end of the housing is the outlet of the denitration reactor, and the outlet of the denitration reactor faces downward.
The inlet of the denitration reactor is connected to the smoke discharge chamber 27 through a communicating air duct 32 which extends in the horizontal direction and in which a static mixer 36 is installed inside the communicating air duct 32. The second nozzle 322 is installed in the connecting air duct 32, and the air duct branch pipe 13 is connected to the second nozzle 322, that is, the second nozzle is communicated with the outlet of the ammonia injection pump. In this embodiment, the second nozzle 322 sprays in a direction opposite to the flow direction of the flue gas.
A vertical pipe 33 is installed on the outlet of the denitration reactor, one end of the return air pipe 34 is connected to the side wall of the vertical pipe 33, the other end of the return air pipe 34 is connected to the smoke inlet cavity 28, the lower end of the vertical pipe 33 is provided with an ash discharge port 38, and a gate valve 39 for discharging dust is installed on the ash discharge port 38.
Claims (5)
1. The in-furnace ammonia injection denitration device is characterized by comprising an ammonia injection part and a denitration reactor, wherein the ammonia injection part comprises an ammonia storage tank, an ammonia injection pump and an ammonia injector arranged in a hearth of a boiler, the ammonia injector comprises an ammonia distribution pipe arranged at the top of the hearth and a first nozzle, the ammonia distribution pipe extends along the inner wall of the hearth in the horizontal direction and is annular, the first nozzle is arranged on the inner side of the ammonia distribution pipe, and a jet orifice of the first nozzle faces to the annular center of the ammonia distribution pipe; the inlet of the ammonia spraying pump is connected to the ammonia storage tank, and the outlet of the ammonia spraying pump is communicated with the ammonia distribution pipe;
the smoke exhaust port of the boiler is connected with a downward extending smoke exhaust channel, an air preheater and an economizer are arranged in the smoke exhaust channel, the air preheater and the economizer are arranged at intervals in the vertical direction, the economizer is positioned on the upper side of the air preheater, a partition plate is arranged between the air preheater and the economizer and divides the space between the air preheater and the economizer into a smoke exhaust cavity and a smoke inlet cavity, and the smoke exhaust cavity is positioned on the upper side of the smoke inlet cavity;
the inlet of the denitration reactor is connected to the smoke exhaust cavity through a connecting air duct, and the outlet of the denitration reactor is connected to the smoke inlet cavity through a return air duct.
2. The ammonia injection denitration apparatus in a furnace according to claim 1,
the connection air channel extends along the horizontal direction, a second nozzle is arranged in the connection air channel, and the second nozzle is communicated with an outlet of the ammonia spraying pump.
3. The ammonia injection denitration apparatus in a furnace according to claim 2,
the second nozzle has a spray direction opposite to the flow direction of the flue gas.
4. The ammonia injection denitration apparatus in a furnace according to claim 2,
a static mixer is arranged in the connecting air duct.
5. The ammonia injection denitration apparatus in a furnace according to claim 1,
this denitration reactor sets up along vertical direction, and denitration reactor's export is towards the below, installs a riser in denitration reactor's export, and on the one end of this return air hose was connected to the lateral wall of riser, the other end of return air hose was connected to into the smoke chamber, and the lower extreme of this riser is provided with the ash discharge mouth, installs the slide valve that is used for discharging the dust at the ash discharge mouth.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021051080.0U CN212680586U (en) | 2020-06-10 | 2020-06-10 | Ammonia spraying denitration device in furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021051080.0U CN212680586U (en) | 2020-06-10 | 2020-06-10 | Ammonia spraying denitration device in furnace |
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| Publication Number | Publication Date |
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| CN212680586U true CN212680586U (en) | 2021-03-12 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
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| CN202021051080.0U Active CN212680586U (en) | 2020-06-10 | 2020-06-10 | Ammonia spraying denitration device in furnace |
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| Country | Link |
|---|---|
| CN (1) | CN212680586U (en) |
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2020
- 2020-06-10 CN CN202021051080.0U patent/CN212680586U/en active Active
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