CN103657410A - Method and device for removing nitrogen oxides in pulverized coal furnace flue gas - Google Patents
Method and device for removing nitrogen oxides in pulverized coal furnace flue gas Download PDFInfo
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- CN103657410A CN103657410A CN201310660535.7A CN201310660535A CN103657410A CN 103657410 A CN103657410 A CN 103657410A CN 201310660535 A CN201310660535 A CN 201310660535A CN 103657410 A CN103657410 A CN 103657410A
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Abstract
The invention provides a method and device for removing nitrogen oxides in pulverized coat furnace flue gas. The device comprises an ammonia gas producing device, an ammonia gas transportation pipeline, a mixer, a diluting pipeline, a flue gas diluting fan, a flue gas outlet pipeline, a flow guiding plate, a flow adjusting device, a catalyst layer, an ammonia spraying grid, and a static mixer. The method for removing nitrogen oxides in flue gas comprises the following steps: guiding the flue gas out of a flue through the flue gas outlet pipeline, feeding the flue gas into the mixer by the flue gas diluting fan, diluting the ammonia gas generated by the ammonia gas producing device with the flue gas in the mixer, simultaneously pre-heating the ammonia gas to a certain temperature, spraying the pre-heated ammonia gas into the flue through the diluting pipeline, wherein the ammonia gas mixes with the high-temperature flue gas in the ammonia spraying grid, then the mixed gas goes through the static mixer, the flow guiding plate, and the flow adjusting device, and finally arrives at the catalyst layer, the mixed gas is denitrified in the action of a catalyst, and thus the nitrogen oxide concentration is reduced. The method effectively utilizes the thermal energy of the flue gas in the flue so as to fully mix the ammonia gas and the hot flue gas, greatly shortens the denitration reaction time, and guarantees the boiler denitration efficiency.
Description
Technical field
The present invention relates to SCR denitration technology, be specifically related to a kind of coal-powder boiler flue gas nitrogen oxide removal methods and device.
Background technology
In recent years, nitrogen oxide (NOx) has replaced SO
2become the primary pollution source of China's atmosphere acid rain, the situation is tense in urban environment improvement.SCR denitration technology is as the best technology of current denitration effect, denitration efficiency reaches as high as more than 90%, its cardinal principle is that tail flue gas is in lower temperature range (280-450 ℃), under the effect of catalyst (alkali metal compound such as iron, vanadium, cobalt), there is reduction reaction, generate nontoxic N
2and H
2o.
At present domestic SCR technology is mostly to continue to use state's external mature technology, utilizes dilution air that air is delivered to ammonia air mix facilities, sends into burner hearth with together with ammonia after dilution.This method is because environment temperature is lower, and dilution ammonia need to absorb a large amount of heats just reaching the required temperature conditions of denitrating flue gas, causes the increase of air leakage into flue duct coefficient, causes boiler efficiency to decline.Also the producer having increases air preheater preheated air, utilizes the heat of preheated air to realize denitration, although shortened the denitration reaction time, because the temperature of preheated air is not also very high, so denitrating flue gas efficiency is not significantly improved.
Summary of the invention
Technical problem to be solved of the present invention is to overcome the deficiencies in the prior art, a kind of coal-powder boiler flue gas nitrogen oxide removal methods and device are provided, effectively utilize the heat of flue gas in flue, ammonia is fully mixed with hot flue gas, greatly shorten the denitration reaction time, guarantee Denitration in Boiler efficiency.
The technical solution adopted for the present invention to solve the technical problems comprises: ammonia preparation facilities, ammonia transfer pipeline, blender, dilution pipeline, flue gas dilution blower fan, flue gas introduction pipe, deflector, fairing, catalyst layer, ammonia-spraying grid, static mixer.
Described ammonia preparation facilities is connected to blender by ammonia carrier pipe.
Draw from flue described flue gas introduction pipe one end, and the other end is connected to blender by flue gas dilution blower fan.
Described ammonia-spraying grid, static mixer, deflector, fairing and catalyst layer are all installed in flue, and static mixer is installed on ammonia-spraying grid downstream, and deflector is installed on flue corner, and fairing is installed on catalyst top.
Described blender is connected to ammonia-spraying grid by dilution pipeline.
Its flue gas nitrogen oxide removal methods is: flue gas is drawn from flue by flue gas introduction pipe, through flue gas dilution blower fan, send into blender, in blender, the ammonia from ammonia preparation facilities is diluted, ammonia is preheating to uniform temperature simultaneously, by dilution pipeline, spray into flue again, by ammonia-spraying grid, directly mix with high-temperature flue gas, after static mixer, deflector, fairing, arrive catalyst layer, under the effect of catalyst, complete removing of nitrogen oxide, reduce nitrogen oxides in effluent concentration.
Beneficial effect of the present invention is:
(1) flue gas in flue is introduced to blender, flue-gas temperature is high, directly utilizes the heat of flue gas to come preheating ammonia, good mixing effect;
(2) reduce ammonia and be heated to the required time of reaction temperature, greatly shortened the length of flue, saved cost of investment;
(3) reduce the inleakage of system, guaranteed boiler efficiency, also effectively reduced the treating capacity of follow-up equipment to flue gas simultaneously,
Energy-conserving and environment-protective more.
Accompanying drawing explanation
Fig. 1 is device schematic diagram of the present invention.
In figure: 1 is ammonia preparation facilities; 2 is ammonia transfer pipeline; 3 is blender; 4 is dilution pipeline; 5 is flue gas dilution blower fan; 6 is flue gas introduction pipe; 7 is deflector; 8 is fairing; 9 is catalyst layer; 10 is flue; 11 is ammonia-spraying grid; 12 is static mixer.
The specific embodiment
Below in conjunction with drawings and the specific embodiments, the invention will be further described.
The invention provides a kind of coal-powder boiler flue gas nitrogen oxide and remove device and method, it removes device and comprises ammonia preparation facilities 1, ammonia transfer pipeline 2, blender 3, dilution pipeline 4, flue gas dilution blower fan 5, flue gas introduction pipe 6, deflector 7, fairing 8, catalyst layer 9, ammonia-spraying grid 11, static mixer 12.
Described ammonia preparation facilities 1 is connected to blender by ammonia transfer pipeline 2.
Draw from flue 10 described flue gas introduction pipe 6 one end, and the other end is connected to blender 3 by flue gas dilution blower fan 5.
Described ammonia-spraying grid 11, static mixer 12, deflector 7, fairing 8 and catalyst layer 9 are all installed in flue 10, static mixer 12 is installed on ammonia-spraying grid 11 downstreams, deflector 7 is installed on flue 10 corners, and fairing 8 is installed on catalyst layer 9 tops.
Described blender 3 is connected to ammonia-spraying grid 11 by dilution pipeline 4.
Its flue gas nitrogen oxide removal methods is: flue gas is drawn from flue 10 by flue gas introduction pipe 6, through flue gas dilution blower fan 5, send into blender 3, in blender 3, the ammonia from ammonia preparation facilities 1 is diluted, ammonia is preheating to uniform temperature simultaneously, by dilution pipeline 4, spray into flue 10 again, by ammonia-spraying grid 11, directly mix with high-temperature flue gas, after static mixer 12, deflector 7, fairing 8, arrive catalyst layer 9, under the effect of catalyst, complete removing of nitrogen oxide, reduce nitrogen oxides in effluent concentration.
Claims (2)
1. coal-powder boiler flue gas nitrogen oxide removal methods and a device, comprise ammonia preparation facilities, ammonia transfer pipeline, blender, dilution pipeline, deflector, fairing, catalyst layer, ammonia-spraying grid, static mixer; Ammonia preparation facilities is connected to blender by ammonia carrier pipe; Ammonia-spraying grid, static mixer, deflector, fairing and catalyst layer are all installed in flue, and static mixer is installed on ammonia-spraying grid downstream, and deflector is installed on flue corner, and fairing is installed on catalyst top; Blender is connected to ammonia-spraying grid by dilution pipeline, it is characterized in that: also comprise flue gas dilution blower fan, flue gas introduction pipe, draw from flue flue gas introduction pipe one end, and the other end is connected to blender by flue gas dilution blower fan.
2. a kind of coal-powder boiler flue gas nitrogen oxide removal methods and device according to claim 1, it is characterized in that: flue gas is drawn from flue by flue gas introduction pipe, through flue gas dilution blower fan, send into blender, in blender, the ammonia from ammonia preparation facilities is diluted, ammonia is preheating to uniform temperature simultaneously, by dilution pipeline, spray into flue again, by ammonia-spraying grid, directly mix with high-temperature flue gas, through static mixer, deflector, after fairing, arrive catalyst layer, under the effect of catalyst, complete removing of nitrogen oxide, reduce nitrogen oxides in effluent concentration.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310660535.7A CN103657410A (en) | 2013-12-10 | 2013-12-10 | Method and device for removing nitrogen oxides in pulverized coal furnace flue gas |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310660535.7A CN103657410A (en) | 2013-12-10 | 2013-12-10 | Method and device for removing nitrogen oxides in pulverized coal furnace flue gas |
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|---|---|
| CN103657410A true CN103657410A (en) | 2014-03-26 |
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| CN201310660535.7A Pending CN103657410A (en) | 2013-12-10 | 2013-12-10 | Method and device for removing nitrogen oxides in pulverized coal furnace flue gas |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105561784A (en) * | 2016-02-26 | 2016-05-11 | 北京峰业电力环保工程有限公司 | Rectifying grille device for denitration technology |
| CN107081055A (en) * | 2017-04-17 | 2017-08-22 | 山东大学 | A kind of eddy flow combined type SCR static mixers |
| CN108283888A (en) * | 2018-03-27 | 2018-07-17 | 易能环境技术有限公司 | A kind of equipment for denitrifying flue gas and its method of denitration |
| CN113426288A (en) * | 2021-06-25 | 2021-09-24 | 华能(大连)热电有限责任公司 | Method for improving denitration efficiency and ammonia escape rate detection and calculation accuracy of coal-fired power plant |
-
2013
- 2013-12-10 CN CN201310660535.7A patent/CN103657410A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105561784A (en) * | 2016-02-26 | 2016-05-11 | 北京峰业电力环保工程有限公司 | Rectifying grille device for denitration technology |
| CN107081055A (en) * | 2017-04-17 | 2017-08-22 | 山东大学 | A kind of eddy flow combined type SCR static mixers |
| CN107081055B (en) * | 2017-04-17 | 2019-08-23 | 山东大学 | A kind of eddy flow combined type SCR static mixer |
| CN108283888A (en) * | 2018-03-27 | 2018-07-17 | 易能环境技术有限公司 | A kind of equipment for denitrifying flue gas and its method of denitration |
| CN113426288A (en) * | 2021-06-25 | 2021-09-24 | 华能(大连)热电有限责任公司 | Method for improving denitration efficiency and ammonia escape rate detection and calculation accuracy of coal-fired power plant |
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Application publication date: 20140326 |