CN102824841B - 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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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 relate to a kind of fire coal circulating fluid bed boiler SNCR denitration system being reducing agent with ammoniacal liquor or urea.
background technology:
Along with the enforcement of national standard " fossil-fuel power plant atmospheric pollutant emission standard " (GB13223-2011), the NOx of the coal-fired electric generation furnace that major part is built and newly-built cannot reach the requirement of new standard, and suitable equipment for denitrifying flue gas must be selected to carry out denitration process.SNCR denitration system due to equipment simple, compact conformation, cost are lower, receive everybody favor.But the urea liquid initial concentration of traditional SNCR denitration technique preparation is 50%, if temperature will crystallization lower than 18 DEG C of solution, so need to arrange circulating heater; Due to spray time still adopt concentration be about 10% urea liquid, therefore to 10% urea liquid, must dilution system be set from the urea liquid of 50%; Further, the pipeline from the urea liquid fluid reservoir of 50% to dilution system also must arrange tracing system; This just causes the drawbacks such as system architecture is complicated, energy consumption is high, investment is many.In addition, Flow-rate adjustment is coordinated by valve and pump, and this kind of regulative mode can meet the demands in large discharge fashion, but for CFB boiler, urea liquid needed for denitration, far fewer than pulverized-coal fired boiler, continues to adopt traditional flow regulative mode just to there is the inaccurate problem of metering.
summary of the invention:
Technical problem to be solved by this invention is: overcome the deficiencies in the prior art, provide a kind of reasonable in design, control convenient, denitration efficiency is high, the escaping of ammonia rate is low and the fire coal circulating fluid bed boiler SNCR denitration system that overall cost of ownership is lower.
Technical scheme of the present invention is: a kind of fire coal circulating fluid bed boiler SNCR denitration system, containing dissolving tank, fluid reservoir, flow control mechanism and spray gun, described dissolving tank is provided with agitator and heater, and, the upper end of described dissolving tank is provided with reducing agent and demineralized water entrance, the delivery outlet of described dissolving tank is communicated with the input port of control valve with described fluid reservoir by pipeline, and the delivery outlet of described fluid reservoir is communicated with spray gun by after flow control mechanism and part flow arrangement.
Described flow control mechanism is metering conveying pump.The corresponding boiler of metering conveying pump described in each or a cyclone separator; Part flow arrangement described in each is at least communicated with two described spray guns.
The urea of described spray gun sprays into the inlet inside being a little arranged on cyclone separator.Described dissolving tank is communicated with sewage well respectively with the lower end of fluid reservoir; Described heater is steam heater.
The invention has the beneficial effects as follows:
1, the present invention sprays into traditional coal-burning boiler SNCR denitration technique, measure control mechanism, reducing agent and a little etc. redesigns, system cost is greatly reduced, 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%, simplifies denitrating technique, decreases process equipment, and decrease dilution and heating link, initial cost and production cost significantly reduce and more can control denitration quality and efficiency.
3, reducing agent is sprayed into the inlet inside of point selection at cyclone separator by the present invention, and temperature is applicable to carrying out reducing agent and NOx reacts, and reducing agent and flue gas Homogeneous phase mixing are convenient in flow field.
4, the present invention adopts metering conveying pump to control flow, accurately adjustable, and, the corresponding boiler of each metering conveying pump or cyclone separator, urea liquid in fluid reservoir delivers to inlet zone by metering conveying pump, again by part flow arrangement equably each spray gun of dispensing spray, only need control metering conveying pump can reach different service condition under NOx remove requirement, use very convenient.
5, the present invention has that denitration efficiency is high, 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.
accompanying drawing illustrates:
Fig. 1 is the structural representation of fire coal circulating fluid bed boiler SNCR denitration system.
detailed description of the invention:
Embodiment: see in Fig. 1, figure, 1-agitator, 2-reducing agent entrance, 3-dissolving tank, 4-heater, 5-sewage well, 6-metering conveying pump, 7-part flow arrangement, 8-cyclone separator, 9-spray gun, 10-compressed air piping, 11-safety valve, 12-demineralized water pipeline, 13-fluid reservoir, 14-flowmeter.
Fire coal circulating fluid bed boiler SNCR denitration system contains dissolving tank 3, fluid reservoir 13, flow control mechanism and spray gun 9, wherein: dissolving tank 3 is provided with agitator 1 and heater 4, and, the upper end of dissolving tank 3 is provided with urea granules entrance 2 and demineralized water entrance, this entrance is connected with demineralized water pipeline 12, demineralized water pipeline 12 is provided with flowmeter 14 and control valve, the delivery outlet of dissolving tank 3 is communicated with the input port of control valve with fluid reservoir 13 by pipeline, and the delivery outlet of fluid reservoir 13 is communicated with spray gun 9 by flow control mechanism and part flow arrangement 7 are rear.
As required, flow control mechanism is metering conveying pump 6, and flow-control is accurate.Dissolving tank 3 is communicated with sewage well 5 respectively with the lower end of fluid reservoir 13, is convenient to effluent discharge.Heater 4 adopts steam heater.
Operation principle:
1. urea granules is poured into by the reducing agent entrance 2 of dissolving tank 3 upper end, adds power plant's demineralized water, is heated by heater 4, and heater 4 can adopt steam heater, thus is made into the urea liquid that concentration is 10%-20%.
2. the urea liquid prepared is for subsequent use to fluid reservoir 13 li by transport pump, and when temperature is lower than the temperature required, the steam heater by fluid reservoir 13 heats.
3. the corresponding boiler of every platform metering conveying pump 6 or cyclone separator 8, urea liquid in fluid reservoir 13 delivers to inlet zone by metering conveying pump 6, by part flow arrangement 7 equably each spray gun 9 of dispensing carry out spraying that (in figure, spray gun is two, three, four etc. can be chosen as required, do not describe in detail one by one), only need control metering conveying pump 6 can reach different service condition under NOx remove requirement.
4. the urea of spray gun 9 sprays into point selection at cyclone separator 8 inlet inside, and temperature is applicable to carrying out reducing agent and NOx reacts, and reducing agent and flue gas Homogeneous phase mixing are convenient in flow field.
The present invention sprays into traditional SNCR denitration technique, measure control mechanism, reducing agent and a little etc. redesigns, system cost is greatly reduced, control convenient, the escaping of ammonia rate is low and denitration efficiency is high.
The above is only preferred embodiment of the present invention, and not do any pro forma restriction to the present invention, every any simple modification done according to technical spirit of the present invention, all still belongs in the scope of technical solution of the present invention.
Claims (1)
1. a fire coal circulating fluid bed boiler SNCR denitration system, containing dissolving tank, fluid reservoir, flow control mechanism and spray gun, it is characterized in that: described dissolving tank is provided with agitator and heater, and, the upper end of described dissolving tank is provided with reducing agent entrance and demineralized water entrance, the delivery outlet of described dissolving tank is communicated with the input port of control valve with described fluid reservoir by pipeline, and the delivery outlet of described fluid reservoir is communicated with spray gun by after flow control mechanism and part flow arrangement; The urea of described spray gun sprays into the inlet inside being a little arranged on cyclone separator; The urea liquid of described urea to be concentration be 10%-20%.
2
.fire coal circulating fluid bed boiler SNCR denitration system according to claim 1, is characterized in that: described flow control mechanism is metering conveying pump.
3
.fire coal circulating fluid bed boiler SNCR denitration system according to claim 2, is characterized in that: the corresponding boiler of metering conveying pump described in each or a cyclone separator; Part flow arrangement described in each is at least communicated with two described spray guns.
4
.fire coal circulating fluid bed boiler SNCR denitration system according to any one of claim 1-3, is characterized in that: described dissolving tank is communicated with sewage well respectively with the lower end of fluid reservoir; Described heater is steam heater.
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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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| CN102824841A CN102824841A (en) | 2012-12-19 |
| CN102824841B true CN102824841B (en) | 2015-04-29 |
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Families Citing this family (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 |
| 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 |
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 |
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2012
- 2012-08-21 CN CN201210296970.1A patent/CN102824841B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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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