CN102626586B - 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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- CN102626586B CN102626586B CN201210095356.9A CN201210095356A CN102626586B CN 102626586 B CN102626586 B CN 102626586B CN 201210095356 A CN201210095356 A CN 201210095356A CN 102626586 B CN102626586 B CN 102626586B
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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 flue gas nitrogen oxide and reduce discharging the treating apparatus of controlling.
Background technology
In the flue gas producing when coal-burning power plant or the operation of consumer waste incineration boiler of power plant, contain a large amount of nitrogen oxide 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 controlling and administering nitrogen oxide is the study hotspot in International Environmental Protection field always, mainly adopts in the world selective catalytic reduction reaction method (SCR) and SNCR method (SNCR).
The principle of selective catalytic reduction (SCR) is under catalyst action, and the amino in reducing agent becomes nitrogen by reduction of nitrogen oxide at relatively low temperature.This technique denitration efficiency is high, now worldwide becomes the main flow technique of large scale industry denitration of boiler smoke.But this process system complexity, takes up an area greatly, invests highly, and because expensive catalyst needs periodic replacement, running cost also strengthens.SNCR method (SNCR) is taken up an area little, invest low, efficiency is moderate, be easy to transformation, can meet preferably the current environment protection emission requirement of China, be to have one of technology of development prospect during nitrogen oxide is administered, domesticly carried out relevant theoretical research, correlation engineering is used and was started in recent years to occur successively.
For high-level discharged nitrous oxides requirement, SNCR method (SNCR) technology can also be combined utilization with selective catalytic reduction reaction method (SCR).SNCR denitration method is to be mainly decomposed into ammonia after nitrogenous medicament (ammonia spirit, aqueous solution of urea or other nitrogenous reducing agent) is sprayed into 850 DEG C ~ 1150 DEG C temperature province atomizations, the nitrogen oxide generation reduction reaction of ammonia preferentially and in flue gas, generate the harmless objects such as nitrogen G&W, thereby reduce the discharge capacity of pollutant nitrogen oxide.
When existing SNCR method (SNCR) denitration engineering practice, the adaptability of reply working conditions change is not strong, medicament service efficiency is not high, and cause the excessive ammonia that is decomposed into of medicament to escape, damage flue follow-up equipment, and its injection apparatus is fixedly mounted in the eject position of burner hearth flue, no matter be that system is normally moved or breaks down, the nozzle of spray gun is exposed in the flue gas environment of high temperature, high dust concentration all the time, the nozzle damage of often being burnt, or fouling obstruction, the service life of nozzle is shorter, maintain and replace inconvenience.
Summary of the invention
For the problems referred to above, the invention provides flue gas nitrogen oxide and reduce discharging the treating apparatus of controlling, it can effectively utilize medicament, reduce the discharge capacity of flue gas nitrogen oxide, prevent the excessive leakage of ammonia simultaneously, and extend to greatest extent the service life of spray gun, reduce operation maintenance cost.
Flue gas nitrogen oxide reduces discharging the treating apparatus of controlling, 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: described drug delivery unit comprises medicament storage tank gate out switch valve, medicament ejector pump, electromagnetic flowmeter, the outlet of described medicament storage tank connects described medicament storage tank gate out switch valve in turn by pipeline, medicament ejector pump, after electromagnetic flowmeter, be communicated with an import of described pipe-line mixer, described medicament ejector pump connects frequency converter, described frequency converter connects PLC module, in chimney, discharged nitrous oxides concentration signal connects the input of described PLC module, described dilution water supply unit comprises water pump, control valve, electromagnetic flowmeter, the outlet of described dilution water pot connects another import that is communicated with described pipe-line mixer after described water pump, control valve, electromagnetic flowmeter in turn by pipeline, the outlet of described pipe-line mixer is external to a few described medicament ejector unit by medicament passage pipeline, the front end of the spray gun of described medicament ejector unit is towards the inner side of described hot wall, the afterbody of described spray gun is connected with drive unit, the plane of the vertical described hot wall of driving direction of described drive unit.
It is further characterized in that:
Described medicament ejector unit also comprises protective casing, the front end of described protective casing is fastening is installed on described hot wall, the part that described protective casing exposes to the outside of hot wall is provided with gas atmosphere inlet, the end of described protective casing is set with sleeve pipe mounting flange, the front end of described spray gun is through going deep into described protective casing after described sleeve pipe mounting flange and towards described flue, the rear portion that exposes to the described spray gun of described protective casing is provided with gas feed, medicament inlet, the external atomization gas of described gas feed, the external dilution medicament of described medicament inlet, atomization gas connects described medicament inlet by purge gas switch valve, the afterbody of described spray gun is connected with drive unit, described drive unit drives described spray gun free to go forward or back out from flue, described drive unit is fixed by mounting bracket.
Atomization gas passage pipeline connects described gas feed by atomization gas delivery hose after connecting in turn atomization gas spinner flowmeter, atomization gas switch valve;
After connecting medicament spinner flowmeter, medicament switch valve in turn, described medicament passage pipeline connects described medicament inlet by drug delivery flexible pipe, medicament passage pipeline liquid feeding end connecting pipe mixer outlet;
Described atomization gas is communicated with described drug delivery flexible pipe after connecting described purge gas switch valve;
Between described exit of pump and control valve, be provided with bye-pass connection pressure-reducing valve and be back to dilution water pot.
Adopt after structure of the present invention, when spray gun drives while stretching into flue by drive unit, medicament ejector pump is according to the feed flow of discharged nitrous oxides concentration signal VFC high concentration medicament in chimney, high concentration medicament enters after the quantitative dilution water dilution constantly being regulated in pipe-line mixer, spray into flue with the lower concentration of determining by injection unit atomization, this measure can prevent that the medicament spraying into is excessive, greatly improve the service efficiency of medicament, reduce operation cost, avoid the excessive escape of ammonia to generate ammonium salt simultaneously, causing the follow-up serial equipment of flue and pipeline to produce corrosivity damages, in addition,, when spray gun can not move or without when operation, flue is exited in the front portion of spray gun under drive unit drives for some reason, the more not fragile spray gun of high temperature with high dust flue gas like this, has extended 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 extends to greatest extent the service life of spray gun, reduces operation maintenance cost.
Brief description of the drawings
Fig. 1 is structural representation of the present invention.
Detailed description of the invention
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, 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 medicament storage tank gate out switch valve 2 in turn by pipeline, medicament ejector pump 3, an import of the rear connecting pipe blender 5 of electromagnetic flowmeter 4, medicament ejector pump 3 connects frequency converter 29, frequency converter 29 connects PLC module 30, in chimney, discharged nitrous oxides concentration signal connects the input of PLC module 30, , 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, the rear connecting pipe blender 5 of electromagnetic flowmeter 6 in turn by pipeline, the outlet of pipe-line mixer 5 is by external at least one the medicament ejector unit 11 of medicament passage pipeline 26, the front end of the spray gun 14 of medicament ejector unit 11 is towards the inner side 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.
Atomization gas passage pipeline connects gas feed 23 by atomization gas delivery hose 22 after connecting in turn atomization gas spinner flowmeter 17, atomization gas switch valve 18;
Medicament passage pipeline connects medicament inlet 25 by drug delivery flexible pipe 24 after connecting in turn medicament spinner flowmeter 12, medicament switch valve 13, and medicament passage pipeline 26 liquid feeding end connecting pipe blenders 5 export.
Atomization gas connects purge gas switch valve 16 rear connection drug delivery flexible pipes 24.
Between the outlet of water pump 8 and control valve 7, be provided with bye-pass 28 connect pressure-reducing valve 10 be back to dilution water pot 9.
Its operation principle is as follows: medicament and dilution water are supplied with and are stored in corresponding storage tank by outside, when promoting spray gun 14, the drive unit 19 of arbitrary injection unit stretches into after flue, starting operation dilution water pump 8 carries dilution water to pipe-line mixer 5, restarting operation medicament ejector pump 3 carries high concentration medicament to pipe-line mixer 5, dilution water dilutes high concentration medicament in pipe-line mixer 5, low concentration medicament after dilution sprays into flue after entering the rear atomization gas atomization being entered of spray gun 14, nitrogen oxide in flue and the low concentration medicament rapid chemical reduction reaction in the situation that of proper temperature and oxygen existence spraying into, generate nitrogen G&W, nitrogen oxide is removed.In chimney, discharged nitrous oxides concentration signal passes through the rotating speed of frequency converter 29 output signal control medicament ejector pumps 3 after the logical operation of PLC module; Medicament ejector pump 3, by VFC, regulates and carries high concentration medicament flow, and the control valve 7 of dilution water supply unit regulates dilution water flow automatically according to the variation of high concentration medicament flow, and the low concentration drug concentration that guarantee pipe-line mixer 5 flows out 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 medicament flow is too low; or flowmeter 17 shows that atomization gas flow is too low; or flue-gas temperature is not suitable for medicament and drops into; or while artificially not needing to drop into gun spraying, medicament switch valve 13 and atomization gas switch valve 18 are closed in succession, and purge gas switch valve 16 is opened; purge gas enters spray gun 14 medicament in spray gun is blown, and then driving mechanism 19 drives spray gun 14 to be withdrawn in protective casing 20.In the time that all injection unit spray guns arranged side by side are all withdrawn into protective casing 20, medicament ejector pump 3 is out of service, water pump 8 is also out of service subsequently, no matter spray gun 14 stretches into flue is still exited flue, protective gas all enters without interruption protective casing 20 from protective casing import 15 and is blown into flue, protective gas enters continuously protective casing 20 and makes operating spray gun 14 avoid high temperature to burn, dust in flue gas is also difficult for fouling on the nozzle of spray gun 14, spray gun 14 exits front purge gas and first interior spray gun 14 residual medicament is purged into flue, prevent that medicament prolonged stay is at spray gun internal corrosion spray gun or the obstruction spray gun that condenses.
Claims (2)
1. flue gas nitrogen oxide reduces discharging the treating apparatus of controlling, 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: described drug delivery unit comprises medicament storage tank gate out switch valve, medicament ejector pump, electromagnetic flowmeter, the outlet of described medicament storage tank connects described medicament storage tank gate out switch valve in turn by pipeline, medicament ejector pump, after electromagnetic flowmeter, be communicated with an import of described pipe-line mixer, described medicament ejector pump connects frequency converter, described frequency converter connects PLC module, in chimney, discharged nitrous oxides concentration signal connects the input of described PLC module, described dilution water supply unit comprises water pump, control valve, electromagnetic flowmeter, the outlet of described dilution water pot connects another import that is communicated with described pipe-line mixer after described water pump, control valve, electromagnetic flowmeter in turn by pipeline, the outlet of described pipe-line mixer is external to a few described medicament ejector unit by medicament passage pipeline, the front end of the spray gun of described medicament ejector unit is towards the inner side of described hot wall, the afterbody of described spray gun is connected with drive unit, the plane of the vertical described hot wall of driving direction of described drive unit, described medicament ejector unit also comprises protective casing, the front end of described protective casing is fastening is installed on described hot wall, the part that described protective casing exposes to the outside of hot wall is provided with gas atmosphere inlet, the end of described protective casing is set with sleeve pipe mounting flange, the front end of described spray gun is through going deep into described protective casing after described sleeve pipe mounting flange and towards described flue, the rear portion that exposes to the described spray gun of described protective casing is provided with gas feed, medicament inlet, the external atomization gas of described gas feed, the external dilution medicament of described medicament inlet, atomization gas connects described medicament inlet by purge gas switch valve, the afterbody of described spray gun is connected with drive unit, described drive unit drives described spray gun free to go forward or back out from flue, described drive unit is fixed by mounting bracket, after connecting atomization gas spinner flowmeter, atomization gas switch valve in turn, described atomization gas passage pipeline connects described gas feed by atomization gas delivery hose, after connecting medicament spinner flowmeter, medicament switch valve in turn, described medicament passage pipeline connects described medicament inlet by drug delivery flexible pipe, medicament passage pipeline liquid feeding end connecting pipe mixer outlet, between described exit of pump and control valve, be provided with bye-pass connection pressure-reducing valve and be back to dilution water pot.
2. flue gas nitrogen oxide according to claim 1 reduces discharging the treating apparatus of controlling, and it is characterized in that: described atomization gas is communicated with described drug delivery flexible pipe after connecting described purge gas switch valve.
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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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| CN102626586B true CN102626586B (en) | 2014-06-04 |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| 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 |
| 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 |
| CN113351391B (en) * | 2020-12-29 | 2022-05-20 | 武汉天空蓝环保科技有限公司 | Double-fluid atomization spray gun subsystem and desulfurization waste water zero discharge system |
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