CN211886218U - Boiler SNCR denitration urea injection apparatus - Google Patents
Boiler SNCR denitration urea injection apparatus Download PDFInfo
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- CN211886218U CN211886218U CN202020359092.3U CN202020359092U CN211886218U CN 211886218 U CN211886218 U CN 211886218U CN 202020359092 U CN202020359092 U CN 202020359092U CN 211886218 U CN211886218 U CN 211886218U
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Abstract
The utility model discloses a boiler SNCR denitration urea injection apparatus, including loading attachment, storage conveyor, urea material loading pipe, urea distributor, urea jetting pipe and spray gun, loading attachment, storage conveyor, urea material loading pipe, urea distributor, urea jetting pipe are located the boiler outside, and the spray gun passes the boiler brickwork and fixes on the boiler, and the nozzle is located the boiler, and storage conveyor passes through urea material loading pipe and urea distributor connection, and urea distributor passes through urea jetting pipe and is connected with the spray gun. The spray gun of the SNCR denitration urea injection device of the boiler is positioned at the middle lower part of the boiler, urea and NOx flue gas are fully reflected, the denitration rate is high, the using amount of urea is reduced by 40%, and the operating cost is reduced.
Description
Technical Field
The utility model belongs to the technical field of the flue gas denitration, concretely relates to boiler SNCR denitration urea injection apparatus.
Background
In the field of flue gas denitration, two methods of Selective Catalytic Reduction (SCR) and non-selective catalytic reduction (SNCR) are widely applied. Both methods use NH3Reducing NOx to harmless N by using the same as a reducing agent2And H2And O. According to the SNCR method, reducing agent aqueous solutions such as ammonia or urea are sprayed into the flue gas at 850-1150 ℃, so that the reduction reaction of NOx is realized. The method does not occupy the space of combustion equipment basically, and has the advantages of small modification workload and short modification period, thereby being applied greatly. Because urea has good stability, no toxicity, no harm, high safety and convenient storage, the urea is the best choice for the reducing agent of the SNCR method.
The denitration non-selective catalytic reduction (SNCR) technology is used in the boiler, the system comprises a feeding machine, a stirrer, a blanking machine, a Roots blower, a conveying pipeline, a spray gun and other equipment, a denitration agent is conveyed to the pipeline from an outlet of the blanking machine through the Roots blower and is sprayed to a hearth through the spray gun to generate a chemical reaction, a urea solution is heated and decomposed to obtain ammonia, and NO is realized through an oxidation-reduction reactionXThereby achieving the purpose of reducing NOXThe purpose of content. Chinese patent CN 107051169A discloses an SNCR denitration apparatus, which comprises a boiler and a spray gun, wherein the spray gun is arranged on the wall of the boiler, and the spray nozzle is positioned in the boiler, and the patent specifies that the spray nozzle of the spray gun is positioned at the middle upper part of the boiler, but the denitration rate is low, and a large amount of urea loss is caused. In the prior art, the using amount of the denitration agent urea is always maintained at about 15 bags per shift, and the daily consumption of the denitration agent reaches 2.25t, so that NO can be ensuredXThe content is reduced to reach the emission standard, and pressure is brought to the environment-friendly emission standard of the boiler. Meanwhile, the use of a large amount of the denitration agent increases the operation cost and the production cost of the boiler.
Therefore, the SNCR denitration system for the boiler, which can reduce the using amount of the denitration agent for the boiler and reduce the operation cost, is very important.
Disclosure of Invention
To the flue gas denitration SNCR device that prior art used, denitration agent urea's consumption is big, boiler running cost and the high problem of manufacturing cost, the utility model provides a boiler SNCR denitration urea injection apparatus, the device have improved the denitration rate of urea, can make the use amount of urea reduce 40%, greatly reduced the operation cost.
Boiler SNCR denitration urea injection apparatus:
the SNCR denitration urea injection device for the boiler is characterized by comprising a feeding device, a storage and conveying device, a urea feeding pipe, a urea distributor, a urea injection pipe and a spray gun;
the urea feeding pipe, the urea distributor and the urea injection pipe are positioned outside the boiler, the spray gun penetrates through the boiler wall and is fixed on the boiler, and the nozzle is positioned in the boiler;
the storage and conveying device is connected with the urea distributor through a urea feeding pipe;
the urea distributor is connected with the spray gun through a urea injection pipe.
Preferably, the spray gun is arranged at the middle lower part of the boiler.
Preferably, the distance between the spray gun and the bottom of the boiler is 5.6 meters.
Preferably, the spray gun is arranged on the wall of the front wall of the boiler.
Preferably, the number of the spray guns is 8-12.
Preferably, the number of the spray guns is 10.
Advantageous effects
The utility model discloses a boiler SNCR denitration urea injection apparatus, the device's spray gun is located the well lower part of boiler, apart from boiler bottom 5.6 meters, and urea and NOx flue gas reflect fully, and the denitration rate is high, and the use amount of urea has reduced 40%, has reduced the operating cost.
Drawings
FIG. 1 shows the SNCR denitration urea injection device of the boiler
Wherein: 1. feeding device 2, storage and conveying device 3, urea feeding pipe 4, urea distributor 5, urea injection pipe 6, spray gun 7 and boiler front wall
Detailed Description
For better explanation of the present invention, the present invention will be described in detail with reference to the accompanying drawings and specific embodiments, which are only illustrative and not intended to limit the scope of the present invention.
FIG. 1 shows an SNCR denitration urea injection device of a boiler of the utility model;
the SNCR denitration urea injection device for the boiler comprises a feeding device 1, a storage conveying device 2, a urea feeding pipeline 3, a urea distributor 4, a urea injection pipe 5 and a spray gun 6, wherein the feeding device 1, the storage conveying device 2, the urea feeding pipe 3, the urea distributor 4 and the urea injection pipe 5 are positioned outside the boiler, the spray gun 6 penetrates through the front furnace wall of the boiler and is fixed on the boiler, and the spray nozzle is positioned in the boiler; the storage conveying device 2 is connected with a urea distributor 4 through a urea feeding pipe 3; the urea distributor 4 is connected with the spray guns 6 through the urea injection pipe 5, the nozzles in the spray guns 6 are positioned at the middle lower part of the boiler, the distance from the bottom of the boiler is 5.6 meters, and the number of the spray guns 6 is 10.
Example 1
The SNCR denitration urea injection device of the boiler provided by the figure 1 is used for carrying out denitration treatment on the flue gas in the boiler,
arrange urea in loading attachment 1 at first, transport urea to storage conveyor 2 through spiral material loading machine, then the roots's fan transports urea to urea distributor 4 through urea material loading pipeline 3, and rethread urea jetting pipe 5 transports to spray gun 6, sprays urea to boiler furnace inside through spray gun 6 at last, fully reacts with the inside NOx flue gas of furnace, NO in the flue gasXThe content is reduced to reach the emission standard.
By adopting the improved SNCR denitration urea injection device for the boiler, 9 bags of urea are consumed per shift, three shifts are performed per day, the discharged NOx can reach the national emission standard, compared with 15 bags of urea consumed per shift in the original SNCR denitration device, 18 bags of urea can be saved per day, the denitration rate is improved by 40%, the cost is saved by 1800 yuan per day, and the cost can be saved by 540000 yuan per year according to 300 working days per year.
Therefore, utilize the utility model provides a boiler SNCR denitration urea injection apparatus, urea and NOx flue gas reaction are abundant, and the denitration rate is high, and the use amount of urea reduces, and then has reduced the operating cost.
Claims (5)
1. The SNCR denitration urea injection device for the boiler is characterized by comprising a feeding device (1), a storage conveying device (2), a urea feeding pipe (3), a urea distributor (4), a urea injection pipe (5) and a spray gun (6);
the feeding device (1), the storage conveying device (2), the urea feeding pipe (3), the urea distributor (4) and the urea injection pipe (5) are positioned outside the boiler, the spray gun (6) penetrates through the boiler wall and is fixed on the boiler, and the nozzle is positioned in the boiler;
the storage and conveying device (2) is connected with the urea distributor (4) through the urea feeding pipe (3);
the urea distributor (4) is connected with the spray gun (6) through a urea injection pipe (5);
the spray gun (6) is arranged at the middle lower part of the boiler.
2. The SNCR denitration urea injection apparatus for a boiler according to claim 1, wherein the distance from the nozzle of the spray gun (6) to the bottom of the boiler is 5.6 m.
3. The SNCR denitration urea injection apparatus for a boiler according to claim 1, wherein the spray gun is installed on a front wall (7) of the boiler.
4. The SNCR denitration urea injection device for the boiler according to claim 1, wherein the number of the spray guns (6) is 8-12.
5. The SNCR denitration urea injection apparatus for a boiler according to claim 4, wherein the number of the spray guns (6) is 10.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020359092.3U CN211886218U (en) | 2020-03-20 | 2020-03-20 | Boiler SNCR denitration urea injection apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020359092.3U CN211886218U (en) | 2020-03-20 | 2020-03-20 | Boiler SNCR denitration urea injection apparatus |
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| CN211886218U true CN211886218U (en) | 2020-11-10 |
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| CN202020359092.3U Active CN211886218U (en) | 2020-03-20 | 2020-03-20 | Boiler SNCR denitration urea injection apparatus |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114504938A (en) * | 2022-01-28 | 2022-05-17 | 大冶有色金属有限责任公司 | Spray gun protection method for continuous refining furnace |
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2020
- 2020-03-20 CN CN202020359092.3U patent/CN211886218U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114504938A (en) * | 2022-01-28 | 2022-05-17 | 大冶有色金属有限责任公司 | Spray gun protection method for continuous refining furnace |
| CN114504938B (en) * | 2022-01-28 | 2023-12-12 | 大冶有色金属有限责任公司 | Spray gun protection method for continuous refining furnace |
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Effective date of registration: 20210420 Granted publication date: 20201110 |
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