CN202844862U - Smoke denitration device - Google Patents
Smoke denitration device Download PDFInfo
- Publication number
- CN202844862U CN202844862U CN 201220487290 CN201220487290U CN202844862U CN 202844862 U CN202844862 U CN 202844862U CN 201220487290 CN201220487290 CN 201220487290 CN 201220487290 U CN201220487290 U CN 201220487290U CN 202844862 U CN202844862 U CN 202844862U
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- spray nozzle
- communicated
- aqueous ammonia
- compressed air
- inlet pipe
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Abstract
The utility model relates to a smoke denitration device. The device comprises an aqueous ammonia storage tank, a diluting water tank, a mixing metering module, an atomized steam inlet pipe, a dry compressed air inlet pipe and an aqueous ammonia spray nozzle which are communicated with one another, wherein the aqueous ammonia spray nozzle comprises an inner pipe and an outer pipe of the spray nozzle; outlets of an aqueous ammonia conveying pump and a diluting water conveying pump are communicated with an inlet of the mixing metering module; an outlet of the mixing metering module is communicated with the inner pipe of the spray nozzle; the inner pipe of the spray nozzle is further communicated with the atomized steam inlet pipe; and a hollow cavity between the inner pipe and the outer pipe of the spray nozzle is communicated with the dry compressed air inlet pipe through a compressed air adjusting valve. Atomized steam is mixed with an aqueous ammonia diluted solution so as to realize aqueous ammonia atomization, improve the mixing effect of the aqueous ammonia diluted solution and smoke and further improve the smoke denitration efficiency to be more than 50%; the spray nozzle has the advantages of simple structure, good penetration performance and far range; a reducing agent and the smoke are mixed uniformly; and dry compressed air is introduced between the inner pipe and the outer pipe of the spray nozzle so as to prevent the spray nozzle from being blocked.
Description
Technical field
The utility model relates to a kind of equipment for denitrifying flue gas, is applicable to the coal-burning power plant, belongs to environmental technology field.
Background technology
In the atmosphere pollution of fired power generating unit discharging, nitrogen oxide causes acid rain and the environmental problems such as photochemical fog, greenhouse effects easily.Denitrating flue gas has become the emphasis problem that country " 12 " needs to be resolved hurrily.
At present, the gas denitrifying technology of application comparative maturity mainly contains two kinds: SCR (SCR) technology and SNCR (SNCR) technology.These two kinds of methods are all with NH
3Deng being reducing agent, NOx is reduced to harmless N
2And H
2O.The SNCR method is in the situation that does not have catalyst to participate in, and the reducing agent aqueous solution such as ammonia or urea is sprayed in the middle of 850～1150 ℃ the flue gas, realizes the reduction reaction of NOx.The initial application of SNCR technology is some fuel oils, the plant gas in 20 century 70 Japan in mid-term.The now application of SNCR is day by day extensive, at present in the world more than the SNCR of the coal-burning power plant technology total installation of generating capacity 5GW.The topmost characteristics of SNCR denitrification apparatus are to build to be one-time investment, and operating cost is low, and occupation area of equipment is little, and when the denitration technology transformation efficient of existing boiler was hanged down, SNCR denitration technology economy was high, is widely used in China coal-burning power plant.
Chemism studies show that: in the situation of good mixing, the reaction of reducing agent and NOx reached balanced reaction denitration rate substantially greater than 90% in 0.3 second.Therefore, for practical application, reducing agent is the core of SNCR technology with mixing of flue gas.It is good that reducing agent mixes with flue gas, and chemical reaction is just abundant, and system's denitration rate is just high, and it is just few that unreacted reducing agent leaks into the secondary pollution that causes in the atmosphere; Otherwise it is poor that reducing agent mixes with flue gas, and chemical reaction is just insufficient, and the denitration rate of system is just low, and it is just large that unreacted reducing agent leaks into the secondary pollution that causes in the atmosphere.
In realizing process of the present invention, the inventor finds to exist at least in the prior art following problem, adopt at present the system of SNCR (SNCR) technology, its denitration rate is still lower, and unreacted reducing agent leaks into and causes secondary pollution in the atmosphere.Simultaneously, reductant nozzle also exists easy obstruction, the strong and inhomogeneous problem of mixing of spraying penetration power.
The utility model content
The technical problems to be solved in the utility model is for above-mentioned deficiency, a kind of equipment for denitrifying flue gas is provided, it is lower to have overcome prior art denitration rate, it is strong and mix inhomogeneous defective to pollute high, the reductant nozzle penetration power of easily stopping up, spray, after adopting equipment for denitrifying flue gas of the present utility model, denitrating flue gas efficient height, reducing agent and flue gas mix, and nozzle is difficult for stopping up.
For overcoming the above problems, the utility model is by the following technical solutions: a kind of equipment for denitrifying flue gas is characterized in that: described equipment for denitrifying flue gas comprises tank used for storing ammonia, dilution water tank, mixing weighing module, atomizing steam air inlet pipe, dried compressed air inlet pipe and the ammonia spray nozzle of connection;
Ammonia spray nozzle comprises nozzle inner tube and nozzle outer tube;
Ammoniacal liquor delivery pump, dilution water carry delivery side of pump to be communicated with the import of mixing weighing module, and the outlet of mixing weighing module is communicated with the nozzle inner tube;
The nozzle inner tube also is communicated with the atomizing steam air inlet pipe;
The nozzle outer tube is communicated with the dried compressed air inlet pipe with the compressed air control valve of cavity between the nozzle inner tube.
A kind of prioritization scheme, described ammoniacal liquor delivery pump is arranged on the bottom of tank used for storing ammonia.
Another kind of prioritization scheme, described dilution water delivery pump is arranged on the bottom of dilution water tank.
Another prioritization scheme, described ammonia spray nozzle is deep into the top of burner hearth, is provided with burner in the burner hearth.
The utility model adopts above technical scheme, compared with prior art, has the following advantages: mix with the ammoniacal liquor weak solution by atomizing steam, accomplish ammonia atomization, improve the mixed effect of ammoniacal liquor weak solution and flue gas, improve denitrating flue gas efficient, denitration efficiency can reach more than 50%; Nozzle arrangements is reasonable, and penetration performance is good, far firing range, and reducing agent and flue gas mix, and adopt Hastelloy, have improved corrosion resistance, pass into dry compressed air between nozzle inner tube, nozzle outer tube, can prevent spray nozzle clogging.
Below in conjunction with drawings and Examples the utility model is described further.
Description of drawings
The structural representation of the flue-gas denitration process that accompanying drawing 1 provides for the utility model;
Among the figure,
1-tank used for storing ammonia, 2-ammoniacal liquor delivery pump, 3-dilution water tank, 4-dilution water delivery pump, 5-mixing weighing module, 6-atomizing steam air inlet pipe, 7-atomizing steam control valve, 8-dried compressed air inlet pipe, 9-dried compressed air control valve, 10-ammonia spray nozzle, 11-burner hearth, 12-burner.
Specific embodiment
Embodiment, as shown in Figure 1, a kind of equipment for denitrifying flue gas, comprise tank used for storing ammonia 1, dilution water tank 3, mixing weighing module 5 and ammonia spray nozzle 10, ammonia spray nozzle 10 comprises nozzle inner tube and nozzle outer tube, the employing Hastelloy is made, the bottom of tank used for storing ammonia 1 connects ammoniacal liquor delivery pump 2, the bottom of dilution water tank 3 connects dilution water delivery pump 4, ammoniacal liquor delivery pump 2, the outlet of dilution water delivery pump 4 is communicated with the import of mixing weighing module 5, the outlet of mixing weighing module 5 is communicated with the nozzle inner tube, the nozzle inner tube also is communicated with atomizing steam air inlet pipe 6 through atomizing steam control valve 7, the nozzle outer tube is communicated with dried compressed air inlet pipe 8 with the compressed air control valve 9 of the cavity between the nozzle inner tube, and ammonia spray nozzle 10 is deep into the top of burner hearth 11, and burner 12 is positioned at burner hearth 11.
Dilution water in the dilution water tank 3 is delivered to mixing weighing module 5 by dilution water delivery pump 4 to be mixed with the ammoniacal liquor that ammoniacal liquor delivery pump 2 is carried, ammoniacal liquor after the dilution is delivered to ammonia spray nozzle 10 places, mix with the atomizing steam of atomizing steam air inlet pipe 6, mixed ammonia atomization liquid sprays into burner hearth 11 tops through the nozzle inner tube, mix with the flue gas of burner 12 dischargings, realize denitrating flue gas.When ammonia spray nozzle 10 did not have ammoniacal liquor to spray into, the cavity between nozzle outer tube and the nozzle inner tube passed into dried compressed air, prevents spray nozzle clogging.
By pre-atomizing outside the denitration reaction district, utilize inject atomizing contain ammonia gas and NOx does selective reaction, denitration efficiency can reach more than 50%, has improved denitration effect.
Those skilled in the art will recognize that; the above-mentioned specific embodiment is exemplary; in order to make those skilled in the art can better understand the utility model content; should not be understood as the restriction to the utility model protection domain; can arrange a plurality of such as ammoniacal liquor delivery pump and dilution water delivery pump; realizing the denitration of a plurality of boilers, so long as the improvement of doing according to technical solutions of the utility model all falls into protection domain of the present utility model.
Claims (4)
1. equipment for denitrifying flue gas is characterized in that: described equipment for denitrifying flue gas comprises tank used for storing ammonia (1), dilution water tank (3), mixing weighing module (5), atomizing steam air inlet pipe (6), dried compressed air inlet pipe (8) and the ammonia spray nozzle (10) of connection;
Ammonia spray nozzle (10) comprises nozzle inner tube and nozzle outer tube;
The outlet of ammoniacal liquor delivery pump (2), dilution water delivery pump (4) is communicated with the import of mixing weighing module (5), and the outlet of mixing weighing module (5) is communicated with the nozzle inner tube;
The nozzle inner tube also is communicated with atomizing steam air inlet pipe (6);
The nozzle outer tube is communicated with dried compressed air inlet pipe (8) with the compressed air control valve of cavity (9) between the nozzle inner tube.
2. a kind of equipment for denitrifying flue gas as claimed in claim 1, it is characterized in that: described ammoniacal liquor delivery pump (2) is arranged on the bottom of tank used for storing ammonia (1).
3. a kind of equipment for denitrifying flue gas as claimed in claim 1 is characterized in that: described dilution water delivery pump (4) is arranged on the bottom of dilution water tank (3).
4. a kind of equipment for denitrifying flue gas as claimed in claim 1, it is characterized in that: described ammonia spray nozzle (10) is deep into the top of burner hearth (11), is provided with burner (12) in the burner hearth (11).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220487290 CN202844862U (en) | 2012-09-24 | 2012-09-24 | Smoke denitration device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220487290 CN202844862U (en) | 2012-09-24 | 2012-09-24 | Smoke denitration device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202844862U true CN202844862U (en) | 2013-04-03 |
Family
ID=47976101
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220487290 Expired - Fee Related CN202844862U (en) | 2012-09-24 | 2012-09-24 | Smoke denitration device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202844862U (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103285729A (en) * | 2013-07-02 | 2013-09-11 | 杭州北高峰电力工程设计有限公司 | SNCR (selective non-catalytic reduction) denitration device for smoke gas of cement kiln |
| CN103433165A (en) * | 2013-08-19 | 2013-12-11 | 江苏新中环保股份有限公司 | Compressed air and ammonia-water solution directional metering and dispensing device |
| CN103438355A (en) * | 2013-08-19 | 2013-12-11 | 江苏新中环保股份有限公司 | Ammonia solution conveying device |
| CN107051169A (en) * | 2017-04-07 | 2017-08-18 | 大唐环境产业集团股份有限公司 | A kind of SNCR denitration device |
| CN109364712A (en) * | 2018-12-11 | 2019-02-22 | 中国华能集团清洁能源技术研究院有限公司 | A kind of flue gas cooled steam atomization spray gun suitable for SNCR method denitration |
-
2012
- 2012-09-24 CN CN 201220487290 patent/CN202844862U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103285729A (en) * | 2013-07-02 | 2013-09-11 | 杭州北高峰电力工程设计有限公司 | SNCR (selective non-catalytic reduction) denitration device for smoke gas of cement kiln |
| CN103433165A (en) * | 2013-08-19 | 2013-12-11 | 江苏新中环保股份有限公司 | Compressed air and ammonia-water solution directional metering and dispensing device |
| CN103438355A (en) * | 2013-08-19 | 2013-12-11 | 江苏新中环保股份有限公司 | Ammonia solution conveying device |
| CN103438355B (en) * | 2013-08-19 | 2015-12-16 | 江苏新中环保股份有限公司 | A kind of ammonia spirit feedway |
| CN107051169A (en) * | 2017-04-07 | 2017-08-18 | 大唐环境产业集团股份有限公司 | A kind of SNCR denitration device |
| CN109364712A (en) * | 2018-12-11 | 2019-02-22 | 中国华能集团清洁能源技术研究院有限公司 | A kind of flue gas cooled steam atomization spray gun suitable for SNCR method denitration |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130403 Termination date: 20150924 |
|
| EXPY | Termination of patent right or utility model |