CN102626586A - Treatment device for emission reduction control over nitrogen oxide in flue gas - Google Patents
Treatment device for emission reduction control over nitrogen oxide in flue gas Download PDFInfo
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- CN102626586A CN102626586A CN2012100953569A CN201210095356A CN102626586A CN 102626586 A CN102626586 A CN 102626586A CN 2012100953569 A CN2012100953569 A CN 2012100953569A CN 201210095356 A CN201210095356 A CN 201210095356A CN 102626586 A CN102626586 A CN 102626586A
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Abstract
The invention provides a treatment device for emission reduction control over nitrogen oxide in flue gas, which has the advantages of effectively utilizing an agent, reducing the emission of the nitrogen oxide in the flue gas, simultaneously preventing over-leakage of ammonia gas, prolonging the service life of a spray gun to the greatest extent and reducing the operation and maintenance cost. The treatment device comprises an agent storage tank, a diluting water tank, an agent conveying unit, a diluting water conveying unit, a pipeline mixer, an agent spray unit and a flue wall, and is characterized in that: the agent conveying unit comprises an agent storage tank outlet switch valve, an agent spray pump and an electromagnetic flow meter; an outlet of the agent storage tank is connected with the agent storage tank outlet switch valve, the agent spray pump and the electromagnetic flow meter through a pipeline in sequence and then communicated with an inlet of the pipeline mixer; the agent spray pump is connected with a frequency converter; the frequency converter is connected with a PLC (Programmable Logic Controller) module; and an effluent concentration signal of the nitrogen oxide in a chimney is connected to an input end of the PLC module.
Description
Technical field
The present invention relates to the technical field of smoke pollution prevention and cure project, be specially the treating apparatus that flue gas nitrogen oxide reduces discharging control.
Background technology
Contain a large amount of nitrogen oxide in the flue gas that produces when coal-burning power plant or the operation of consumer waste incineration boiler of power plant and (comprise NO, NO
2, N
2O etc.; Be referred to as NOx); This pollutant is considered to one of main source of atmosphere pollution and acid rain; Therefore, the pollution of control and improvement nitrogen oxide is international environmental protection hot research fields always, mainly adopts selective catalytic reduction reaction method (SCR) and SNCR method (SNCR) in the world.
The principle of selective catalytic reduction (SCR) is under catalyst action, and the amino in the reducing agent is reduced into nitrogen with nitrogen oxide under relatively low temperature.This technology denitration efficiency is high, worldwide becomes the main flow technology of large scale industry denitration of boiler smoke at present.But this process system is complicated, takes up an area of greatly, and investment is high, and because expensive catalysts needs periodic replacement, running cost also strengthens.SNCR method (SNCR) is taken up an area of little; Invest lowly, efficient is moderate, is easy to transform; Can satisfy the current environment protection emission requirement of China preferably; Be to have one of technology of development prospect during nitrogen oxide is administered, domesticly carried out relevant theoretical research, the correlation engineering utilization began to occur successively in recent years.
For high-level discharged nitrous oxides requirement, SNCR method (SNCR) technology can also be united utilization with selective catalytic reduction reaction method (SCR).SNCR denitration method mainly is to be decomposed into ammonia after nitrogenous medicament (ammonia spirit, aqueous solution of urea or other nitrogenous reducing agent) is sprayed into 850 ℃ ~ 1150 ℃ temperature province atomizings; Nitrogen oxide generation reduction reaction in the preferential and flue gas of ammonia; Generate harmless objects such as nitrogen G&W, thereby reduce the discharge capacity of pollutant nitrogen oxide.
During existing SNCR method (SNCR) denitration engineering practice, the adaptability of reply working conditions change is not strong, and the medicament service efficiency is not high; And cause the excessive ammonia that is decomposed into of medicament to escape, damage the flue follow-up equipment, and its injection apparatus is fixedly mounted in the eject position of burner hearth flue; No matter be the normal operation of system or break down; The nozzle of spray gun exposes all the time in the flue gas environment of high temperature, high dust concentration, the nozzle damage of often being burnt, or fouling is stopped up; The service life of nozzle is shorter, and maintain and replace is inconvenient.
Summary of the invention
To the problems referred to above, the invention provides the treating apparatus that flue gas nitrogen oxide reduces discharging control, it can effectively utilize medicament; Reduce the discharge capacity of flue gas nitrogen oxide; Prevent the excessive leakage of ammonia simultaneously, and prolong the service life of spray gun to greatest extent, reduce operation maintenance cost.
Flue gas nitrogen oxide reduces discharging the treating apparatus of control; Its technical scheme is such: it comprises medicament storage tank, dilution water pot, drug delivery unit, dilution water supply unit, pipe-line mixer, medicament ejector unit, hot wall; It is characterized in that: said drug delivery unit comprises medicament storage tank gate out switch valve, medicament ejector pump, electromagnetic flowmeter; The outlet of said medicament storage tank connects an import that is communicated with said pipe-line mixer behind said medicament storage tank gate out switch valve, medicament ejector pump, the electromagnetic flowmeter in order through pipeline; Said medicament ejector pump connects frequency converter; Said frequency converter connects the PLC module, and the discharged nitrous oxides concentration signal connects the input of said PLC module in the chimney; Said dilution water supply unit comprises water pump, control valve, electromagnetic flowmeter; The outlet of said dilution water pot connects another import that is communicated with said pipe-line mixer behind said water pump, control valve, the electromagnetic flowmeter in order through pipeline; The outlet of said pipe-line mixer is external to few said medicament ejector unit through medicament passage pipeline; The front end of the spray gun of said medicament ejector unit is towards the inboard of said hot wall; The afterbody of said spray gun is connected with drive unit, the plane of the vertical said hot wall of driving direction of said drive unit.
It is further characterized in that:
Said medicament ejector unit also comprises protective casing; The front end of said protective casing is fastening to be installed on said hot wall, and the part that said protective casing exposes to the outside of hot wall is provided with the gas atmosphere inlet, and the end of said protective casing is set with the sleeve pipe mounting flange; The front end of said spray gun passes and gos deep into said protective casing behind the said sleeve pipe mounting flange and towards said flue; The rear portion that exposes to the said spray gun of said protective casing is provided with gas feed, medicament inlet, the external atomization gas of said gas feed, the external dilution medicament of said medicament inlet; Atomization gas connects said medicament inlet through the purge gas switch valve; The afterbody of said spray gun is connected with drive unit, and it is free to go forward or back out from flue that said drive unit drives said spray gun, and said drive unit is fixed through mounting bracket.
Atomization gas passage pipeline connects said gas feed through the atomization gas delivery hose after connecting atomization gas spinner flowmeter, atomization gas switch valve in order;
Connect said medicament inlet through the drug delivery flexible pipe after said medicament passage pipeline connects medicament spinner flowmeter, medicament switch valve in order, medicament passage pipeline liquid feeding end connects the pipeline mixer outlet;
Said atomization gas is communicated with said drug delivery flexible pipe after connecting said purge gas switch valve;
Be provided with bye-pass connection pressure-reducing valve between said exit of pump and the control valve and be back to the dilution water pot.
After adopting structure of the present invention; When spray gun stretched into flue through the drive unit driving, the medicament ejector pump was according to the feed flow of discharged nitrous oxides concentration signal VFC high concentration medicament in the chimney, after the quantitative dilution water that quilt is constantly regulated in the high concentration medicament entering pipe-line mixer dilutes; The concentration of deciding with lower sprays into flue through the injection unit atomizing; This measure can prevent that the medicament that sprays into is excessive, has greatly improved the service efficiency of medicament, has reduced operation cost; Avoid the excessive escape of ammonia to generate ammonium salt simultaneously, cause follow-up serial equipment of flue and pipeline to produce corrosivity and damage; In addition, when spray gun can not move for some reason or need not to move, flue was withdrawed from the front portion of spray gun under drive unit drives, and the more not fragile spray gun of high temperature with high dust flue gas has like this prolonged service life of spray gun; To sum up, it can effectively utilize medicament, reduces the discharge capacity of flue gas nitrogen oxide, prevents the excessive leakage of ammonia simultaneously, and prolongs the service life of spray gun to greatest extent, reduces operation maintenance cost.
Description of drawings
Fig. 1 is a structural representation of the present invention.
The specific embodiment
See Fig. 1; It comprises medicament storage tank 1, dilution water pot 9, drug delivery unit, dilution water supply unit, pipe-line mixer 5, medicament ejector unit 11, hot wall 21; The drug delivery unit comprises medicament storage tank gate out switch valve 2, medicament ejector pump 3, electromagnetic flowmeter 4; The outlet of medicament storage tank 1 connects an import of medicament storage tank gate out switch valve 2, medicament ejector pump 3, electromagnetic flowmeter 4 back connecting pipe blenders 5 in order through pipeline; Medicament ejector pump 3 connects frequency converter 29, and frequency converter 29 connects PLC module 30, and the discharged nitrous oxides concentration signal connects the input of PLC module 30 in the chimney; The dilution water supply unit comprises water pump 8, control valve 7, electromagnetic flowmeter 6; The outlet of dilution water pot 9 connects another import of water pump 8, control valve 7, electromagnetic flowmeter 6 back connecting pipe blenders 5 in order through pipeline; The outlet of pipe-line mixer 5 is through medicament passage pipeline 26 external at least one medicament ejector unit 11; The front end of the spray gun 14 of medicament ejector unit 11 is towards the inboard of hot wall 21; The afterbody of spray gun 14 is connected with drive unit 19, the plane of the driving direction vertical gas pass wall 21 of drive unit 19.
Medicament ejector unit 11 also comprises protective casing 20; The fastening hot wall 21 that is installed on of the front end of protective casing 20, the part that protective casing 20 exposes to the outside of hot wall 21 is provided with gas atmosphere inlet 15, and the end of protective casing 20 is set with sleeve pipe mounting flange 27; The front end of spray gun 14 passes and gos deep into protective casing 20 behind the sleeve pipe mounting flange 27 and towards flue; The rear portion that exposes to the spray gun 14 of protective casing 20 is provided with gas feed 23, medicament inlet 25, gas feed 23 external atomization gas, medicament inlet 25 external dilution medicaments; Atomization gas connects medicament inlet 25 through purge gas switch valve 16, and the afterbody of spray gun 14 is connected with drive unit 19.
Atomization gas passage pipeline connects atomization gas spinner flowmeter 17 in order, atomization gas switch valve 18 backs connect gas feed 23 through atomization gas delivery hose 22;
Medicament passage pipeline connects medicament spinner flowmeter 12 in order, medicament switch valve 13 backs connect medicament inlet 25 through drug delivery flexible pipe 24, and medicament passage pipeline 26 liquid feeding ends connect pipe-line mixer 5 outlets.
Atomization gas connects purge gas switch valve 16 backs and is communicated with drug delivery flexible pipe 24.
Be provided with bye-pass 28 connection pressure-reducing valves 10 between the outlet of water pump 8 and the control valve 7 and be back to dilution water pot 9.
Its operation principle is following: medicament and dilution water are supplied with by the outside and are stored in the corresponding storage tank; After the drive unit 19 promotion spray guns 14 of arbitrary injection unit stretch into flue; Starting operation dilution water pump 8 carries dilution water to pipe-line mixer 5; Restarting operation medicament ejector pump 3 carries the high concentration medicament to pipe-line mixer 5; Dilution water dilutes the high concentration medicament in pipe-line mixer 5, sprays into flue after the atomization gas atomizing that low concentration medicament entering spray gun 14 backs after the dilution are got into, the nitrogen oxide in the flue and the low concentration medicament that sprays into rapid chemical reduction reaction under the situation of proper temperature and oxygen existence; Generate the nitrogen G&W, nitrogen oxide is removed.The discharged nitrous oxides concentration signal passes through the rotating speed of frequency converter 29 output signal controlling medicament ejector pumps 3 in the chimney after the logical operation of PLC module; Medicament ejector pump 3 is regulated and is carried high concentration medicament flow through VFC, and the control valve 7 of dilution water supply unit is regulated the dilution water flow automatically according to the variation of high concentration medicament flow, guarantees that the low concentration drug concentration of pipe-line mixer 5 outflows is constant.Pressure-reducing valve 10 is in order to pass back into excessive dilution water dilution water pot 9.
In addition, when flowmeter 12 shows that the medicament flows are low excessively, perhaps flowmeter 17 shows that the atomization gas flows are low excessively; Perhaps flue-gas temperature is not suitable for the medicament input; In the time of perhaps artificially need not dropping into gun spraying, medicament switch valve 13 cuts out with atomization gas switch valve 18 in succession, and purge gas switch valve 16 is opened; Purge gas gets into spray gun 14 medicament in the spray gun is blown to the greatest extent, and driving mechanism 19 drives spray gun 14 and is withdrawn in the protective casing 20 then.When all injection unit spray guns arranged side by side all are withdrawn into protective casing 20; Medicament ejector pump 3 is out of service; Water pump 8 is also out of service subsequently, and no matter spray gun 14 stretches into flue is still withdrawed from flue, and protective gas all gets into protective casing 20 without interruption from protective casing import 15 and is blown into flue; Protective gas gets into protective casing 20 continuously and makes operating spray gun 14 avoid high temperature to burn; Dust in flue gas also is difficult for fouling on the nozzle of spray gun 14, and purge gas was purged into flue with medicament residual in the spray gun 14 earlier before spray gun 14 withdrawed from, and prevented that medicament is trapped in spray gun internal corrosion spray gun for a long time or the obstruction spray gun that condenses.
Claims (6)
1. flue gas nitrogen oxide reduces discharging the treating apparatus of control; It comprises medicament storage tank, dilution water pot, drug delivery unit, dilution water supply unit, pipe-line mixer, medicament ejector unit, hot wall; It is characterized in that: said drug delivery unit comprises medicament storage tank gate out switch valve, medicament ejector pump, electromagnetic flowmeter; The outlet of said medicament storage tank connects an import that is communicated with said pipe-line mixer behind said medicament storage tank gate out switch valve, medicament ejector pump, the electromagnetic flowmeter in order through pipeline; Said medicament ejector pump connects frequency converter; Said frequency converter connects the PLC module, and the discharged nitrous oxides concentration signal connects the input of said PLC module in the chimney; Said dilution water supply unit comprises water pump, control valve, electromagnetic flowmeter; The outlet of said dilution water pot connects another import that is communicated with said pipe-line mixer behind said water pump, control valve, the electromagnetic flowmeter in order through pipeline; The outlet of said pipe-line mixer is external to few said medicament ejector unit through medicament passage pipeline; The front end of the spray gun of said medicament ejector unit is towards the inboard of said hot wall; The afterbody of said spray gun is connected with drive unit, the plane of the vertical said hot wall of driving direction of said drive unit.
2. flue gas nitrogen oxide according to claim 1 reduces discharging the treating apparatus of control; It is characterized in that: said medicament ejector unit also comprises protective casing; The front end of said protective casing is fastening to be installed on said hot wall, and the part that said protective casing exposes to the outside of hot wall is provided with the gas atmosphere inlet, and the end of said protective casing is set with the sleeve pipe mounting flange; The front end of said spray gun passes and gos deep into said protective casing behind the said sleeve pipe mounting flange and towards said flue; The rear portion that exposes to the said spray gun of said protective casing is provided with gas feed, medicament inlet, the external atomization gas of said gas feed, the external dilution medicament of said medicament inlet; Atomization gas connects said medicament inlet through the purge gas switch valve; The afterbody of said spray gun is connected with drive unit, and it is free to go forward or back out from flue that said drive unit drives said spray gun, and said drive unit is fixed through mounting bracket.
3. flue gas nitrogen oxide according to claim 2 reduces discharging the treating apparatus of control, it is characterized in that: connect said gas feed through the atomization gas delivery hose after said atomization gas passage pipeline connects atomization gas spinner flowmeter, atomization gas switch valve in order.
4. flue gas nitrogen oxide according to claim 3 reduces discharging the treating apparatus of control; It is characterized in that: connect said medicament inlet through the drug delivery flexible pipe after said medicament passage pipeline connects medicament spinner flowmeter, medicament switch valve in order, medicament passage pipeline liquid feeding end connects the pipeline mixer outlet.
5. flue gas nitrogen oxide according to claim 4 reduces discharging the treating apparatus of control, it is characterized in that: said atomization gas is communicated with said drug delivery flexible pipe after connecting said purge gas switch valve.
6. flue gas nitrogen oxide according to claim 5 reduces discharging the treating apparatus of control, it is characterized in that: be provided with bye-pass connection pressure-reducing valve between said exit of pump and the control valve and be back to the dilution water pot.
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| CN201210095356.9A CN102626586B (en) | 2012-04-01 | 2012-04-01 | Treatment device for emission reduction control over nitrogen oxide in flue gas |
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| CN201210095356.9A CN102626586B (en) | 2012-04-01 | 2012-04-01 | Treatment device for emission reduction control over nitrogen oxide in flue gas |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103438355A (en) * | 2013-08-19 | 2013-12-11 | 江苏新中环保股份有限公司 | Ammonia solution conveying device |
| CN103432955A (en) * | 2013-08-19 | 2013-12-11 | 江苏新中环保股份有限公司 | Device for diluting ammonia-water solution |
| CN103611411A (en) * | 2013-12-04 | 2014-03-05 | 无锡雪浪环境科技股份有限公司 | Dry denitration processing device in furnace |
| CN107029543A (en) * | 2015-08-05 | 2017-08-11 | 深圳市能源环保有限公司 | A kind of waste incinerator non-catalytic reduction flue gas denitrification system for being used to reclaim useless ammonia |
| CN109999630A (en) * | 2019-05-08 | 2019-07-12 | 武汉立为工程技术有限公司 | A kind of SNCR denitration system |
| CN113351391A (en) * | 2020-12-29 | 2021-09-07 | 武汉天空蓝环保科技有限公司 | Double-fluid atomization spray gun subsystem and desulfurization wastewater zero discharge system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113351391A (en) * | 2020-12-29 | 2021-09-07 | 武汉天空蓝环保科技有限公司 | Double-fluid atomization spray gun subsystem and desulfurization wastewater zero discharge system |
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| CN102626586B (en) | 2014-06-04 |
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Address after: 214000 no.2020 Lihu Avenue, Binhu District, Wuxi City, Jiangsu Province Patentee after: WUXI XUELANG ENVIRONMENTAL TECHNOLOGY Co.,Ltd. Address before: 214128 Shuangxin economic Park, Taihu street, Binhu District, Wuxi City, Jiangsu Province Patentee before: WUXI XUELANG ENVIRONMENTAL TECHNOLOGY Co.,Ltd. |