CN102824841A - Selective non-catalytic reduction (SNCR) denitration system of coal-fired circulating fluidized bed boiler - Google Patents
Selective non-catalytic reduction (SNCR) denitration system of coal-fired circulating fluidized bed boiler Download PDFInfo
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- CN102824841A CN102824841A CN2012102969701A CN201210296970A CN102824841A CN 102824841 A CN102824841 A CN 102824841A CN 2012102969701 A CN2012102969701 A CN 2012102969701A CN 201210296970 A CN201210296970 A CN 201210296970A CN 102824841 A CN102824841 A CN 102824841A
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Abstract
The invention discloses a selective non-catalytic reduction (SNCR) denitration system of a coal-fired circulating fluidized bed boiler. The SNCR denitration system comprises a dissolution tank, a liquid storage tank, a flow control mechanism and spray guns. The dissolution tank is provided with a stirrer and a heating device. An upper end of the dissolution tank is provided with a reducing agent inlet and a demineralized water pipe inlet. An outlet of the dissolution tank is communicated with an inlet of the liquid storage tank by a pipe and a control valve. An outlet of the liquid storage tank is communicated with the spray guns by the flow control mechanism and a flow divider. The flow control mechanism is a metering delivery pump. A urea injection point of the spray gun is arranged at an inner side of an inlet of a cyclone separator. The SNCR denitration system modifies the traditional coal-fired boiler SNCR denitration technology, a metering control mechanism and a reducing agent injection point so that they are suitable for a circulating fluidized bed boiler and thus a system cost is greatly reduced; control is convenient; an ammonia escape rate is low; and denitration efficiency is high.
Description
Technical field:
The present invention relates to a kind of flue gas denitrification system, particularly relating to a kind of is the fire coal circulating fluid bed boiler SNCR denitrating system of reducing agent with ammoniacal liquor or urea.
Background technology:
Along with national standard " thermal power plant's atmosphere pollutants emission standards " enforcement (GB13223-2011); Major part has been founded a capital and can't have been reached the requirement of new standard with the NOx of newly-built coal-fired electric generation furnace, must select suitable equipment for denitrifying flue gas to carry out the denitration processing.The SNCR denitrating system is because equipment is simple, and compact conformation, cost are lower, have received everybody favor.But the urea liquid initial concentration of traditional SNCR denitrating technique preparation is 50%, if temperature be lower than 18 ℃ of solution will crystallization, so circulating heater need be set; Because still adopting concentration when spraying is about 10% urea liquid, therefore to 10% urea liquid dilution system must be set from 50% urea liquid; And the urea liquid fluid reservoir from 50% also must be provided with tracing system to the pipeline of dilution system; This just causes drawbacks such as system architecture is complicated, energy consumption is high, investment is many.In addition; Flow-rate adjustment cooperates through valve and pump, and this kind regulative mode can meet the demands in big flow fashion, but for the CFB boiler; The required urea liquid of denitration continues to adopt traditional flow regulative mode just to have the inaccurate problem of metering far fewer than pulverized-coal fired boiler.
Summary of the invention:
Technical problem to be solved by this invention is: overcome the deficiency of prior art, a kind of reasonable in design, control is convenient, denitration efficiency is high, the escaping of ammonia rate is low and overall cost of ownership is lower fire coal circulating fluid bed boiler SNCR denitrating system is provided.
Technical scheme of the present invention is: a kind of fire coal circulating fluid bed boiler SNCR denitrating system; Contain dissolving tank, fluid reservoir, flow control mechanism and spray gun; Said dissolving tank is equipped with agitator and heater, and the upper end of said dissolving tank is provided with reducing agent and demineralized water entrance; The delivery outlet of said dissolving tank is communicated with the input port of said fluid reservoir through pipeline and control valve, and the delivery outlet of said fluid reservoir passes through to be communicated with spray gun behind flow control mechanism and the part flow arrangement.
Said flow control mechanism is a metering conveying pump.The corresponding boiler of each said metering conveying pump or a cyclone separator; Each said part flow arrangement is communicated with two said spray guns at least.
It is inboard that the urea of said spray gun sprays into the inlet that a little is arranged on cyclone separator.The lower end of said dissolving tank and fluid reservoir is communicated with sewage well respectively; Said heater is a steam heater.
The invention has the beneficial effects as follows:
1, the present invention sprays into a little etc. traditional coal-burning boiler SNCR denitrating technique, measure control mechanism, reducing agent and has carried out design again, make system cost greatly reduce, control convenient, the escaping of ammonia rate is low and denitration efficiency is high.
2, the direct configuration concentration of the present invention is the urea liquid of 10%-20%, has simplified denitrating technique, has reduced process equipment, has reduced dilution and heating link, and initial cost and production cost reduce significantly and more can control denitration quality and efficient.
3, that reducing agent is sprayed into point selection is inboard at the inlet of cyclone separator in the present invention, and temperature is fit to carry out reducing agent reacts with NOx, and the flow field is convenient to reducing agent and is evenly mixed with flue gas.
4, the present invention adopts metering conveying pump to control flow; Accurate and adjustable, and, corresponding boiler of each metering conveying pump or cyclone separator; Urea liquid in the fluid reservoir is delivered to inlet zone through metering conveying pump; Again through part flow arrangement equably each spray gun of dispensing spray, only need a control metering conveying pump can reach that NOx removes requirement under the different service conditions, use very convenient.
5, the present invention has the denitration efficiency height, the escaping of ammonia rate is low and lower-cost advantage, and it is applied widely, is easy to promotion and implementation, has good economic benefit.
Description of drawings:
Fig. 1 is the structural representation of fire coal circulating fluid bed boiler SNCR denitrating system.
The specific embodiment:
Embodiment: referring to Fig. 1, among the figure, 1-agitator, 2-reducing agent inlet, 3-dissolving tank, 4-heater; The 5-sewage well, 6-metering conveying pump, 7-part flow arrangement, 8-cyclone separator, 9-spray gun; The 10-compressed air piping, 11-safety valve, 12-demineralized water pipeline, 13-fluid reservoir, 14-flowmeter.
Fire coal circulating fluid bed boiler SNCR denitrating system contains dissolving tank 3, fluid reservoir 13, flow control mechanism and spray gun 9; Wherein: dissolving tank 3 is equipped with agitator 1 and heater 4; And; The upper end of dissolving tank 3 is provided with urea granules inlet 2 and demineralized water entrance, and this inlet is connected with demineralized water pipeline 12, and flowmeter 14 and control valve are installed on the demineralized water pipeline 12; The delivery outlet of dissolving tank 3 is communicated with the input port of fluid reservoir 13 through pipeline and control valve, and the delivery outlet of fluid reservoir 13 is communicated with spray gun 9 through flow control mechanism and part flow arrangement 7 backs.
As required, flow control mechanism is a metering conveying pump 6, and flow-control is accurate.The lower end of dissolving tank 3 and fluid reservoir 13 is communicated with sewage well 5 respectively, is convenient to effluent discharge.Heater 4 adopts steam heater.
Operation principle:
1. urea granules is poured into by the reducing agent inlet 2 of dissolving tank 3 upper ends, adds power plant's demineralized water, heats through heater 4, and heater 4 can adopt steam heater, thereby is made into the urea liquid that concentration is 10%-20%.
2. it is subsequent use that the urea liquid for preparing is transported to 13 li of fluid reservoirs through pump, when temperature is lower than the temperature of requirement, can heat through the steam heater of fluid reservoir 13.
3. every metering conveying pump 6 a corresponding boiler or cyclone separators 8; Urea liquid in the fluid reservoir 13 is delivered to inlet zone through metering conveying pump 6; Through part flow arrangement 7 equably each spray gun 9 of dispensing spray that (spray gun is two among the figure; Can choose three, four or the like as required, not detail one by one), only need a control metering conveying pump 6 can reach that NOx removes requirement under the different service conditions.
4. it is inboard at cyclone separator 8 inlet that the urea of spray gun 9 sprays into point selection, and temperature is fit to carry out reducing agent reacts with NOx, and the flow field is convenient to reducing agent and is evenly mixed with flue gas.
The present invention sprays into a little etc. traditional SNCR denitrating technique, measure control mechanism, reducing agent and has carried out design again, make system cost greatly reduce, control convenient, the escaping of ammonia rate is low and denitration efficiency is high.
The above only is preferred embodiment of the present invention, is not the present invention is done any pro forma restriction, and any simple modification that every foundation technical spirit of the present invention is done all still belongs in the scope of technical scheme of the present invention.
Claims (5)
1. fire coal circulating fluid bed boiler SNCR denitrating system; Contain dissolving tank, fluid reservoir, flow control mechanism and spray gun; It is characterized in that: said dissolving tank is equipped with agitator and heater, and the upper end of said dissolving tank is provided with reducing agent inlet and demineralized water entrance; The delivery outlet of said dissolving tank is communicated with the input port of said fluid reservoir through pipeline and control valve, and the delivery outlet of said fluid reservoir passes through to be communicated with spray gun behind flow control mechanism and the part flow arrangement.
2. fire coal circulating fluid bed boiler SNCR denitrating system according to claim 1, it is characterized in that: said flow control mechanism is a metering conveying pump.
3. fire coal circulating fluid bed boiler SNCR denitrating system according to claim 2 is characterized in that: the corresponding boiler of each said metering conveying pump or a cyclone separator; Each said part flow arrangement is communicated with two said spray guns at least.
4. fire coal circulating fluid bed boiler SNCR denitrating system according to claim 1 is characterized in that: it is inboard that the urea of said spray gun sprays into the inlet that a little is arranged on cyclone separator.
5. according to each described fire coal circulating fluid bed boiler SNCR denitrating system of claim 1-4, it is characterized in that: the lower end of said dissolving tank and fluid reservoir is communicated with sewage well respectively; Said heater is a steam heater.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210296970.1A CN102824841B (en) | 2012-08-21 | 2012-08-21 | Selective non-catalytic reduction (SNCR) denitration system of coal-fired circulating fluidized bed boiler |
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| CN201210296970.1A CN102824841B (en) | 2012-08-21 | 2012-08-21 | Selective non-catalytic reduction (SNCR) denitration system of coal-fired circulating fluidized bed boiler |
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| CN102824841B CN102824841B (en) | 2015-04-29 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105597514A (en) * | 2016-02-03 | 2016-05-25 | 广东宝丽华电力有限公司 | Device and method for increasing denitration efficiency of circulating fluidized bed boiler |
| CN106310910A (en) * | 2016-11-09 | 2017-01-11 | 山西华仁通电力科技有限公司 | Mixing distribution device for power station boiler SNCR denitration system |
| CN106731618A (en) * | 2017-02-14 | 2017-05-31 | 哈尔滨蔚蓝环保设备制造有限公司 | Boiler SNCR urea method denitrating systems |
| CN107051157A (en) * | 2017-04-24 | 2017-08-18 | 中国联合工程公司 | A kind of SNCR denitration reducing agent prepares Storing and conveying system and method |
| CN109351161A (en) * | 2018-12-03 | 2019-02-19 | 北京晟龙伟嘉科技有限公司 | A kind of denitrification apparatus and its method of denitration |
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| JPH08126820A (en) * | 1994-10-31 | 1996-05-21 | Mitsubishi Heavy Ind Ltd | Waste gas denitration device and method for injecting denitrating reducing agent |
| JP2003265923A (en) * | 2002-03-14 | 2003-09-24 | Mitsui & Co Ltd | General purpose feeder of reductant composition for flue gas denitration |
| CN102274687A (en) * | 2011-08-15 | 2011-12-14 | 浙江大学 | SNCR (Selective Non-Catalytic Reduction) flue gas denitration device taking urea as reducting agent |
| CN202237748U (en) * | 2011-08-15 | 2012-05-30 | 浙江大学 | SNCR (selective non catalytic reduction) flue gas denitration device taking carbamide as reducing agent |
| CN102580503A (en) * | 2012-03-06 | 2012-07-18 | 东方电气集团东方锅炉股份有限公司 | Ejection device for realizing SNCR (selective non-catalytic reduction) with CFB (circulating fluidized bed) furnace and using method |
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- 2012-08-21 CN CN201210296970.1A patent/CN102824841B/en active Active
Patent Citations (5)
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| JPH08126820A (en) * | 1994-10-31 | 1996-05-21 | Mitsubishi Heavy Ind Ltd | Waste gas denitration device and method for injecting denitrating reducing agent |
| JP2003265923A (en) * | 2002-03-14 | 2003-09-24 | Mitsui & Co Ltd | General purpose feeder of reductant composition for flue gas denitration |
| CN102274687A (en) * | 2011-08-15 | 2011-12-14 | 浙江大学 | SNCR (Selective Non-Catalytic Reduction) flue gas denitration device taking urea as reducting agent |
| CN202237748U (en) * | 2011-08-15 | 2012-05-30 | 浙江大学 | SNCR (selective non catalytic reduction) flue gas denitration device taking carbamide as reducing agent |
| CN102580503A (en) * | 2012-03-06 | 2012-07-18 | 东方电气集团东方锅炉股份有限公司 | Ejection device for realizing SNCR (selective non-catalytic reduction) with CFB (circulating fluidized bed) furnace and using method |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105597514A (en) * | 2016-02-03 | 2016-05-25 | 广东宝丽华电力有限公司 | Device and method for increasing denitration efficiency of circulating fluidized bed boiler |
| CN106310910A (en) * | 2016-11-09 | 2017-01-11 | 山西华仁通电力科技有限公司 | Mixing distribution device for power station boiler SNCR denitration system |
| CN106731618A (en) * | 2017-02-14 | 2017-05-31 | 哈尔滨蔚蓝环保设备制造有限公司 | Boiler SNCR urea method denitrating systems |
| CN107051157A (en) * | 2017-04-24 | 2017-08-18 | 中国联合工程公司 | A kind of SNCR denitration reducing agent prepares Storing and conveying system and method |
| CN107051157B (en) * | 2017-04-24 | 2022-11-11 | 中国联合工程有限公司 | SNCR denitration reducing agent preparation, storage and conveying system and method |
| CN109351161A (en) * | 2018-12-03 | 2019-02-19 | 北京晟龙伟嘉科技有限公司 | A kind of denitrification apparatus and its method of denitration |
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| CN102824841B (en) | 2015-04-29 |
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Effective date of registration: 20150320 Address after: 450000 Henan city of Zhengzhou province Zheng open road and road intersection of North West 2 kilometers Yanming Applicant after: Zhengzhou Electric Power College Address before: 450004 No. 2 Shangcheng Road, Henan, Zhengzhou Applicant before: Yang Jianhua |
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