CN201664578U - Selective catalytic reduction device for directly spraying urea solution - Google Patents
Selective catalytic reduction device for directly spraying urea solution Download PDFInfo
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- CN201664578U CN201664578U CN201020154218XU CN201020154218U CN201664578U CN 201664578 U CN201664578 U CN 201664578U CN 201020154218X U CN201020154218X U CN 201020154218XU CN 201020154218 U CN201020154218 U CN 201020154218U CN 201664578 U CN201664578 U CN 201664578U
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- catalytic reduction
- reduction device
- selective catalytic
- urea solution
- flue
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Abstract
The utility model provides a selective catalytic reduction device for directly spraying urea solution, relating to the technical field of environmental protection. The selective catalytic reduction device for directly spraying urea solution comprises a plurality of groups of spraying guns for spraying the urea solution, a mixer and a catalyst, wherein the spraying guns are arranged at an inlet flue in front of an SCR reactor; the mixer and the catalyst are distributed in sequence along the flowing direction of smoke; and all the spraying guns are connected with a solution tank containing urea by a metering distributor. Compared with the prior art, the selective catalytic reduction device directly sprays urea solution for pyrolysis and ammonia supply into a flue, reduces running cost and equipment investment, saves the space and has safe and reliable use.
Description
Technical field
The utility model relates to environmental technology field, particularly the selective catalytic reduction device of direct injection urea liquid.
Background technology
Contain a large amount of nitrogen oxide in the flue gas that combustion of fossil fuel produces, as sour gas, nitrogen oxide is one of atmosphere pollution that forms acid rain and acid mist, and ecological environment and health are had huge harm.Nitrogen oxide in the flue gas under certain conditions, can with nitrogenous reducing agent generation reduction reaction, generate the water and the nitrogen that environment are not caused secondary pollution.This reduction reaction can occur in the temperature of hanging down some relatively, but need the catalytic action of catalyst to react, this technology is called SCR technology SCR, has obtained extensive use in the SCR gas denitrifying technology flue gas in power station boiler denitration at home and abroad at present.
In the prior art, the nitrogenous reducing agent that uses in the SCR system mainly is divided into three kinds in urea, ammoniacal liquor and liquefied ammonia, and wherein urea is because its use, convenient transportation, better practicability and security performance are widely used.The method of urea system ammonia mainly contains two kinds of hydrolysis and pyrolysis, and technology for hydrolyzing is not welcome by the client because of needs highly pressured hydrolysis device.And the shortcoming of urea pyrolytic technique is: need pyrolysis oven, high-temperature gas in the pyrolysis oven need be by oil, gas firing or electrical heating supply, because the high investment of pyrolysis oven and need combustion gas, fuel oil or electrically heated high operating cost to cause huge economic pressures to the user, and taken bigger space, totally unfavorable for utilizing of transformation project space.In order to guarantee safety, the concentration that pyrolysis need be produced ammonia utilizes hot-air to be diluted to below 5%, has increased the investment of successor devices in addition.
Summary of the invention
In order to overcome the shortcoming that above-mentioned prior art exists, the purpose of this utility model provides a kind of selective catalytic reduction device of direct injection urea liquid.It directly sprays the urea liquid pyrolysis for ammonia in flue, reduced operating cost and equipment investment, and saved the space, and is safe and reliable.
In order to realize the foregoing invention purpose, the technical solution of the utility model realizes as follows:
A kind of selective catalytic reduction device of direct injection urea liquid, its design feature be, it comprises that many groups of being arranged on gas approach place before the SCR reactor spray the spray gun of urea liquids and the blender of arranging successively along the flow of flue gas direction, catalyst.Described each spray gun links to each other with the NaOH solution tank NaOH that urea is housed through metered dose dispensers.
In above-mentioned equipment for denitrifying flue gas, described each spray gun be arranged on the walling of flue or the flue chamber in.
In above-mentioned equipment for denitrifying flue gas, the quantity of described blender adopts one-level or more than the one-level, will keep certain distance between the blender more than two-stage and the two-stage.
Compare with prior art, advantage of the present utility model is: the utility model has saved most of capital equipment of hydrolysis of urea and pyrolysis, as hydrolytic tank, pyrolysis oven, dilution blower fan etc.The utility model does not need hydrolysis and the necessary special thermal source of pyrolysis, has cancelled ammonia-spraying grid, has reduced investment and operating cost, has saved the device space.The utility model directly removes pyrolysis in a large amount of flue gases of nitrogen oxide at needs, has guaranteed the abundant pyrolysis of urea, and the ammonia concentration of generation is beyond explosion limit, and is safe and reliable.
Below in conjunction with the drawings and specific embodiments the utility model is described further.
Description of drawings
Fig. 1 is the utility model structural representation;
Fig. 2 is the utility model method of denitration flow chart.
The specific embodiment
With reference to figure 1, the utility model comprises that many groups of being arranged on gas approach place before the SCR reactor spray the spray gun 2 of urea liquids and the blender of arranging successively along the flow of flue gas direction 4, catalyst 5.Each spray gun 2 be arranged on the walling of flue or the flue chamber in, each spray gun 2 links to each other with the NaOH solution tank NaOH 3 that urea is housed through metered dose dispensers.The quantity of blender 4 adopts one-level or more than the one-level, will keep certain distance between the blender 4 more than two-stage and the two-stage.
Referring to Fig. 2, the method step the during denitration of the utility model device is:
1) spray gun 2 of some is arranged on the walling of flue before the SCR reactor or in the flue chamber, flue gas 1 temperature herein is more than 250 ℃.According to nitrogen oxide in urea liquid and the flue gas is 1: 10～10: 1 mol ratio, and the urea liquid of 5%-70% concentration in the NaOH solution tank NaOH 3 is transported to each spray gun 2 place through metered dose dispensers, and urea liquid evenly sprays in the flue with the drop size less than 500 microns.
2) urea liquid stopped in flue gas 1 to 15 second, and with flue gas mass transfer, heat transfer, urea liquid is an ammonia by evaporation, fusion, pyrolysis.
3) ammonia that produces of pyrolysis and flue gas reach catalyst 5 surfaces by the above blender 4 of one-level after fully mixing, under the catalytic action of catalyst with flue gas in nitrogen oxide generation catalytic reduction reaction, generation nitrogen and water.
Claims (3)
1. the selective catalytic reduction device of a direct injection urea liquid, it is characterized in that, it comprises the spray gun (2) of many groups of injection urea liquids that are arranged on the preceding gas approach place of SCR reactor and blender (4), the catalyst (5) that the flow of flue gas direction is arranged successively in burner hearth, and described each spray gun (2) links to each other with the NaOH solution tank NaOH that urea is housed (3) through metered dose dispensers.
2. the selective catalytic reduction device of direct injection urea liquid according to claim 1 is characterized in that, described each spray gun (2) be arranged on the walling of flue or the flue chamber in.
3. the selective catalytic reduction device of direct injection urea liquid according to claim 1 is characterized in that, the quantity of described blender (4) adopts one-level or more than the one-level, will keep certain distance between the blender (4) more than two-stage and the two-stage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201020154218XU CN201664578U (en) | 2010-04-09 | 2010-04-09 | Selective catalytic reduction device for directly spraying urea solution |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201020154218XU CN201664578U (en) | 2010-04-09 | 2010-04-09 | Selective catalytic reduction device for directly spraying urea solution |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201664578U true CN201664578U (en) | 2010-12-08 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201020154218XU Expired - Lifetime CN201664578U (en) | 2010-04-09 | 2010-04-09 | Selective catalytic reduction device for directly spraying urea solution |
Country Status (1)
| Country | Link |
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| CN (1) | CN201664578U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102068904A (en) * | 2010-12-10 | 2011-05-25 | 中电投远达环保工程有限公司 | SCR flue gas denitration technology and device by urea directly-spraying method |
| CN102210974A (en) * | 2010-04-09 | 2011-10-12 | 同方环境股份有限公司 | Selective catalytic reduction device by directly spraying urea solution and method thereof |
-
2010
- 2010-04-09 CN CN201020154218XU patent/CN201664578U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102210974A (en) * | 2010-04-09 | 2011-10-12 | 同方环境股份有限公司 | Selective catalytic reduction device by directly spraying urea solution and method thereof |
| CN102068904A (en) * | 2010-12-10 | 2011-05-25 | 中电投远达环保工程有限公司 | SCR flue gas denitration technology and device by urea directly-spraying method |
| CN102068904B (en) * | 2010-12-10 | 2013-10-02 | 中电投远达环保工程有限公司 | SCR flue gas denitration technology and device by urea directly-spraying method |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20101208 |
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| CX01 | Expiry of patent term |