CN212252592U - Sectional SNCR (selective non-catalytic reduction) system of circulating fluidized bed boiler - Google Patents
Sectional SNCR (selective non-catalytic reduction) system of circulating fluidized bed boiler Download PDFInfo
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- CN212252592U CN212252592U CN202020555305.XU CN202020555305U CN212252592U CN 212252592 U CN212252592 U CN 212252592U CN 202020555305 U CN202020555305 U CN 202020555305U CN 212252592 U CN212252592 U CN 212252592U
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- fluidized bed
- cyclone separator
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Abstract
A sectional SNCR system of a circulating fluidized bed boiler belongs to the technical field of fluidized bed boilers. The method is characterized in that: the boiler comprises a boiler body (1), a cyclone separator (2) and a material returning device (8), wherein an inlet flue (3) is arranged between an outlet at the upper part of the boiler body (1) and an inlet at the upper part of the cyclone separator (2), a first-level spray gun (6) is arranged at an outlet at the upper part of the boiler body (1), and a second-level spray gun (10) is arranged on an outlet flue (7) at the upper part of the cyclone separator (2). The utility model discloses change the flue gas treatment structure of traditional circulating fluidized bed boiler SNCR system, all set up the aqueous ammonia spray gun in cyclone's entry and exit, carry out the sectional type to getting into and exhaust flue gas and handle, spout ammonia through segmentation, two-stage, the nitrogen oxide that can produce in the effectual desorption cyclone reduces the nitrogen oxide emission value, has also obviously improved SNCR efficiency.
Description
Technical Field
A sectional SNCR system of a circulating fluidized bed boiler belongs to the technical field of fluidized bed boilers.
Background
At present, in the SNCR system of the circulating fluidized bed boiler, the ammonia water is added to be single in arrangement structure, only aiming at the smoke inlet of the cyclone separator, the ammonia water enters the separator through the ammonia gun to be mixed with the smoke, and the ammonia gun is arranged at the inlet and can not effectively remove the nitrogen oxides generated in the cyclone separator of the circulating fluidized bed boiler. When the emission value of nitrogen oxides is increased, the sprayed amount of ammonia water can be increased greatly, and the SNCR efficiency is obviously reduced.
Disclosure of Invention
The utility model discloses the technical problem that will solve is: the defects of the prior art are overcome, and the sectional SNCR system of the circulating fluidized bed boiler, which can effectively remove the nitrogen oxides generated in the cyclone separator and improve the SNCR efficiency, is provided.
The utility model provides a technical scheme that its technical problem adopted is: the sectional SNCR system of the circulating fluidized bed boiler is characterized in that: the boiler comprises a boiler body, a cyclone separator and a material returning device, wherein an inlet flue is arranged between an outlet at the upper part of the boiler body and an inlet at the upper part of the cyclone separator, a first-stage spray gun is arranged at the outlet at the upper part of the boiler body, and a second-stage spray gun is arranged on the outlet flue at the upper part of the cyclone separator.
The utility model changes the smoke treatment structure of the SNCR system of the traditional circulating fluidized bed boiler, the ammonia water spray guns are arranged at the inlet and the outlet of the cyclone separator, the entering and the discharging smoke is treated in a sectional way, the nitrogen oxide generated by combustion in the hearth reacts with the ammonia water sprayed by the primary spray gun of the inlet flue of the cyclone separator, and primary removal is carried out; and the nitrogen oxide generated in the cyclone separator reacts with ammonia water sprayed by a secondary spray gun arranged in an outlet flue of the cyclone separator to carry out secondary removal. Through subsection and two-stage ammonia spraying, nitrogen oxides generated in the cyclone separator can be effectively removed, the emission value of the nitrogen oxides is reduced, and the SNCR efficiency is also obviously improved.
The inlet flue is provided with an expansion joint, and the first-stage spray gun is arranged between the outlet at the upper part of the boiler body and the expansion joint.
The second-stage spray guns are provided with a plurality of groups, and the plurality of groups of second-stage spray guns are annularly and uniformly distributed on the side wall of the outlet flue.
The second-stage spray guns are vertically and uniformly distributed on the side wall of the inlet flue.
And a material returning device is connected between the bottom of the cyclone separator and the lower part of the boiler body.
The lower part of the boiler body is provided with a secondary air duct, and the secondary air duct comprises an elbow air pipe.
Compared with the prior art, the utility model discloses the beneficial effect who has is:
the utility model changes the smoke treatment structure of the SNCR system of the traditional circulating fluidized bed boiler, the ammonia water spray guns are arranged at the inlet and the outlet of the cyclone separator, the entering and the discharging smoke is treated in a sectional way, the nitrogen oxide generated by combustion in the hearth reacts with the ammonia water sprayed by the primary spray gun of the inlet flue of the cyclone separator, and primary removal is carried out; and the nitrogen oxide generated in the cyclone separator reacts with ammonia water sprayed by a secondary spray gun arranged in an outlet flue of the cyclone separator to carry out secondary removal. Through subsection and two-stage ammonia spraying, nitrogen oxides generated in the cyclone separator can be effectively removed, the emission value of the nitrogen oxides is reduced, and the SNCR efficiency is also obviously improved. And simple structure, reasonable in design can improve SNCR system efficiency greatly, can effectively desorption circulating fluidized bed boiler cyclone the inside nitrogen oxide that produces.
Drawings
Fig. 1 is a structural schematic diagram of a sectional type SNCR system of a circulating fluidized bed boiler.
The device comprises a boiler body 1, a boiler body 2, a cyclone separator 3, an inlet flue 4, an expansion joint 5, a secondary air duct 6, a primary spray gun 7, an outlet flue 8, a material returning device 9, an elbow air pipe 10 and a secondary spray gun.
Detailed Description
Fig. 1 is a preferred embodiment of the present invention, and the present invention will be further explained with reference to fig. 1.
Referring to figure 1: the utility model provides a circulating fluidized bed boiler sectional type SNCR system, includes boiler body 1, cyclone 2 and returning charge device 8, is equipped with entry flue 3 between 1 upper portion export of boiler body and the 2 upper portion entry of cyclone, and 1 upper portion exit of boiler body is equipped with one-level spray gun 6, is equipped with second grade spray gun 10 on the 7 upper portion export flues of cyclone 2.
An expansion joint 4 is arranged on the inlet flue 3, and the first-stage spray gun 6 is arranged between the outlet at the upper part of the boiler body 1 and the expansion joint 4. The second-stage spray guns 10 are provided with a plurality of groups, and the plurality of groups of second-stage spray guns 10 are annularly and uniformly distributed on the side wall of the outlet flue 7. The first-stage spray guns 6 are vertically and evenly distributed on the side wall of the inlet flue 3. A material returning device 8 is connected between the bottom of the cyclone separator 2 and the lower part of the boiler body 1. The lower part of the boiler body 1 is provided with a secondary air duct 5, and the secondary air duct 5 comprises an elbow air duct 9.
The ammonia guns are arranged in sections to form two-stage treatment. Ammonia guns are respectively arranged on an inlet flue 3 and an outlet flue 7 of the cyclone separator 2; nitrogen oxides generated by combustion in the hearth of the boiler body 1 react with ammonia water sprayed by a primary spray gun 6 arranged on one side of an inlet flue 3 of the cyclone separator 2 to carry out primary removal; after passing through the cyclone separator 2, the nitrogen oxides generated inside and the nitrogen oxides left after the first-stage removal react with ammonia water sprayed by a second-stage spray gun 10 arranged in an outlet flue 7 of the cyclone separator 2 to carry out second-stage removal. Particularly, the two-stage spray guns 10 arranged in the outlet flue 7 of the cyclone separator 2 are equally arranged, and an ammonia gun is arranged on the outlet flue 7 of the cyclone separator 2 at intervals of 60 degrees, so that the coverage of ammonia water on flue gas is ensured. And inlet manual ball valves are arranged on the secondary spray guns 10 of the outlet flues 7 of the cyclone separators 2, and the boiler can be put into operation and stopped and flow adjusted one by one according to the needs during the operation of the boiler.
While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention. However, any simple modification, equivalent change and modification made to the above embodiments according to the technical substance of the present invention still belong to the protection scope of the technical solution of the present invention.
Claims (5)
1. A sectional SNCR system for a circulating fluidized bed boiler, comprising: the boiler comprises a boiler body (1), a cyclone separator (2) and a material returning device (8), wherein an inlet flue (3) is arranged between an upper outlet of the boiler body (1) and an upper inlet of the cyclone separator (2), a first-stage spray gun (6) is arranged at the upper outlet of the boiler body (1), and a second-stage spray gun (10) is arranged on an upper outlet flue (7) of the cyclone separator (2); and a material returning device (8) is connected between the bottom of the cyclone separator (2) and the lower part of the boiler body (1).
2. The segmented SNCR system of a circulating fluidized bed boiler of claim 1, wherein: the expansion joint (4) is arranged on the inlet flue (3), and the first-stage spray gun (6) is arranged between the outlet at the upper part of the boiler body (1) and the expansion joint (4).
3. The segmented SNCR system of a circulating fluidized bed boiler of claim 1, wherein: the second-stage spray guns (10) are provided with a plurality of groups, and the plurality of groups of second-stage spray guns (10) are annularly and uniformly distributed on the side wall of the outlet flue (7).
4. The segmented SNCR system of a circulating fluidized bed boiler of claim 1, wherein: the secondary spray guns (10) are vertically and uniformly distributed on the side wall of the inlet flue (3).
5. The segmented SNCR system of a circulating fluidized bed boiler of claim 1, wherein: the boiler is characterized in that a secondary air duct (5) is arranged on the lower portion of the boiler body (1), and the secondary air duct (5) comprises an elbow air pipe (9).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020555305.XU CN212252592U (en) | 2020-04-15 | 2020-04-15 | Sectional SNCR (selective non-catalytic reduction) system of circulating fluidized bed boiler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020555305.XU CN212252592U (en) | 2020-04-15 | 2020-04-15 | Sectional SNCR (selective non-catalytic reduction) system of circulating fluidized bed boiler |
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| Publication Number | Publication Date |
|---|---|
| CN212252592U true CN212252592U (en) | 2020-12-29 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202020555305.XU Expired - Fee Related CN212252592U (en) | 2020-04-15 | 2020-04-15 | Sectional SNCR (selective non-catalytic reduction) system of circulating fluidized bed boiler |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116159421A (en) * | 2022-12-05 | 2023-05-26 | 山东大学 | Novel fluidized bed boiler SNCR spray gun arrangement structure, system and use method thereof |
-
2020
- 2020-04-15 CN CN202020555305.XU patent/CN212252592U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116159421A (en) * | 2022-12-05 | 2023-05-26 | 山东大学 | Novel fluidized bed boiler SNCR spray gun arrangement structure, system and use method thereof |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20201229 |
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| CF01 | Termination of patent right due to non-payment of annual fee |