CN103566751A - Fluidized bed boiler desulfurization method and device - Google Patents
Fluidized bed boiler desulfurization method and device Download PDFInfo
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- CN103566751A CN103566751A CN201310531657.6A CN201310531657A CN103566751A CN 103566751 A CN103566751 A CN 103566751A CN 201310531657 A CN201310531657 A CN 201310531657A CN 103566751 A CN103566751 A CN 103566751A
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Abstract
The invention relates to a fluidized bed boiler desulfurization method, comprising the following steps that powdery limestone in a lime storage tank is conveyed into an ejector through a pipeline by utilizing a Roots blower, compressed air is filled in the ejector, the compressed air is mixed with the limestone in the ejector, the mixture is sprayed into a secondary air pipe of a boiler in a mist form, and the mixture uniformly enters a dense phase region of a hearth from two sides of the boiler under the action of secondary air to fully react with sulfur dioxide under a high temperature state. According to the fluidized bed boiler desulfurization method provided by the invention, a lime-gas mixture with certain pressure is ejected into the hearth at a high speed through the ejector, the atomized lime can fully react with the sulfur dioxide in the boiler flue gas under the disturbance of the air speed of the boiler flue gas, and as shown in trial operation, the control is stable, the desulfurization efficiency is high and the economic benefit is significant.
Description
technical field:
The present invention relates to a kind of effective fluidized bed boiler desulfurization technical field.
technical background:
In recent years, along with improving constantly of national requirements for environmental protection, waste gas qualified discharge is a have to environmental protection index of strict implement of enterprise.So far, various desulfur technologies arise.Dry type desulfurizing, wet type desulfurizing, half dry type desulfurization etc.For CFBB, it is high that desulfuration in furnace raw material limestone consumes, and desulfuration efficiency is low, because lime stone amount is uncontrollable, affect the normal working of a furnace operation of boiler in sweetening process, sulfur dioxide (SO2) emissions fluctuation is large.
summary of the invention:
Object of the present invention is exactly the deficiency existing for existing desulphurization in circulating fluidized bed boiler technology, a kind of effective fluidized bed boiler desulfurization method and the device thereof that provide.
The technical solution used in the present invention is as follows:
A kind of fluidized-bed combustion boiler sulfur method, it is characterized in that comprising the following steps: spiral shell thatch blower and pipeline is delivered to the powdered lime stone in lime storage tank in injector, injector access compressed air, in injector, compressed air is the vaporific boiler secondary airduct that sprays into after mixing with lime stone, evenly enters burner hearth Mi Xiang district fully react with sulfur dioxide high temperature state under secondary wind action from boiler both sides.
The present invention also provides a kind of fluidized-bed combustion boiler desulfurizer, it is characterized in that comprising:
Lime storage tank, lime storage tank below is provided with manual flashboard and screw(-type) feeder, screw(-type) feeder below is connected to injector by pipeline, in the pipeline of screw(-type) feeder below, is also connected with spiral shell thatch blower fan and restricting orifice, and injector is connected with compressed air source by pipeline.
In the present invention application, the lime stone of certain standard granularity is stored in lime storage tank, by frequency conversion charger continuous charging to pipeline storehouse.Power conduit roots blower provides power gas source that lime stone in pipeline storehouse is delivered to boiler coal feeding mouth top ash silo, atomising device access certain pressure compressed air, enter mixing chamber together with ash material in the ash silo of boiler coal feeding mouth top, mixed lime stone and compressed air are vaporific form and spray into boiler secondary airduct, under secondary wind action, from boiler both sides, evenly enter the fully reaction in sulfur dioxide high temperature state of burner hearth Mi Xiang district, to reduce content of sulfur dioxide in boiler smoke, accomplish row up to standard.After lime stone after improving enters burner hearth in emulsion zone, under the condition of high temperature, reaction is more abundant, along with moving after flue gas, in temperature decline boiler back segment flue gas, residual lime stone will continue reaction, because the reaction time is long, simultaneously due to vaporific, guaranteed in returning charge ash that limestone content reaches and minimize, desulfuration efficiency is high and stable.
For making pipeline air quantity Uniform Flow, do not cause and breathe heavily flow phenomenon, at fan outlet, install one of restricting orifice additional, make power wind flow stable, lime stone is steady flow in pipeline, guarantees that dosage is even.
Automatic frequency-conversion charger: bucket type receives master signal, controls frequency conversion size according to the variation of actual sulfur dioxide and changes lime stone dosage to reach, thereby realize auto feed.
Injector atomising device: this contrive equipment is mainly quoted injector principle, usings compressed air as working media, aspirates and force feed gas, to obtain the injector of vacuum.Compressed air enters injector, ejects supersonic flow from nozzle, and due to the viscosity of gas, high velocity air entrainments the gas in suction chamber, thereby in suction chamber, forms vacuum.This atomising device chief component is nozzle, mixed chamber, diffuser and suction chamber.These two parts of nozzle and diffuser have formed the special airflow line of a section variation.Compressed air is transformed into kinetic energy by nozzle by pressure energy bleeds, thereby and mixed airflow is transformed into pressure energy by diffuser by kinetic energy carries out exhaust.Pressure differential between import and export, makes air be able to flow in pipeline.Because injection air-flow is larger, make the gas ejecting, grey mixture be vaporific, reach atomizing effect.Lime stone enters in the ash can of coal feeding hole top, enters mixing chamber under the suction of injector together with compressed air, sprays into secondary air channel after high-speed mixing, at boiler emulsion zone, forms atomization shape.
Its feature of the present invention for above problem, traditional strength is carried and high velocity jet atomizing principles is applied to desulfuration in furnace field.By changing air velocity, air and ash material are mixed, the ash of certain pressure, gas mixture enter at a high speed burner hearth by injector, owing to having certain pressure and flow velocity, make it be atomization shape.Ash material after atomization can fully be reacted with sulfur dioxide in boiler smoke under the disturbance of boiler smoke wind speed, through trial run, controls and stablizes, and desulfuration efficiency is high, remarkable in economical benefits.
accompanying drawing explanation:
Fig. 1 is system architecture schematic diagram of the present invention.
the specific embodiment:
Below by the specific embodiment, present technique is set forth:
One, as shown in Figure 1, a kind of fluidized-bed combustion boiler desulfurizer provided by the invention, comprise: lime storage tank, lime storage tank below is provided with manual flashboard and screw(-type) feeder, screw(-type) feeder below is connected to injector by pipeline, in the pipeline of screw(-type) feeder below, be also connected with spiral shell thatch blower fan and restricting orifice, injector is connected with compressed air source by pipeline.
Spiral shell thatch blower fan is the first conveying wind, and Main Function exports ash material by charger and is delivered to grey chamber, atomising device below, for guaranteeing that ash material Uniform Flow installs one of restricting orifice additional at 2 meters of straight tube places after charger ash hole.
Injector atomising device is the second conveying wind, mainly desulfurizing agent high speed atomization shape is sent into boiler secondary bellows, enters burner hearth Mi Xiang district react with SO 2 from fume with Secondary Air after mixing.Position, boiler secondary air port is 2 meters of of boiler feed opening.
Lime stone is by closed cell tank car pump to storage tank, and tank deck dust arrester installation prevents the collection of dust in canned operation.The loosening wind of high pressure prevents lime stone caking in storage tank, and lime stone in the loosening storage tank of self-timing, guarantees that blanking is normal.Lime stone is delivered to boiler secondary bellows place atomising device ash silo to screw(-type) feeder by pipeline by manual lower composite plate, and atomising device reacts to entering burner hearth after secondary air duct the ash after mixed, pneumatic transmission with sulfur dioxide.
Control system adopts DCS to control, and monitoring sulfur dioxide actual parameter, sets sulfur dioxide and control parameter, and the frequency conversion of Long-distance Control charger, realizes remote auto adjustment, stable.
Two, a kind of fluidized-bed combustion boiler sulfur method, comprise the following steps: spiral shell thatch blower and pipeline is delivered to the powdered lime stone in lime storage tank in injector, the compressed air of injector access 0.45MPa, in injector, compressed air is the vaporific boiler secondary airduct that sprays into after mixing with lime stone, evenly enters burner hearth Mi Xiang district fully react with sulfur dioxide high temperature state under secondary wind action from boiler both sides.
Claims (2)
1. a fluidized-bed combustion boiler sulfur method, it is characterized in that comprising the following steps: spiral shell thatch blower and pipeline is delivered to the powdered lime stone in lime storage tank in injector, injector access compressed air, in injector, compressed air is the vaporific boiler secondary airduct that sprays into after mixing with lime stone, evenly enters burner hearth Mi Xiang district fully react with sulfur dioxide high temperature state under secondary wind action from boiler both sides.
2. a fluidized-bed combustion boiler desulfurizer, is characterized in that comprising:
Lime storage tank, lime storage tank below is provided with manual flashboard and screw(-type) feeder, screw(-type) feeder below is connected to injector by pipeline, in the pipeline of screw(-type) feeder below, is also connected with spiral shell thatch blower fan and restricting orifice, and injector is connected with compressed air source by pipeline.
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| CN201310531657.6A CN103566751B (en) | 2013-11-01 | 2013-11-01 | A kind of fluidized-bed combustion boiler sulfur method and device thereof |
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| CN201310531657.6A CN103566751B (en) | 2013-11-01 | 2013-11-01 | A kind of fluidized-bed combustion boiler sulfur method and device thereof |
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| CN103566751A true CN103566751A (en) | 2014-02-12 |
| CN103566751B CN103566751B (en) | 2016-04-13 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104474880A (en) * | 2014-12-02 | 2015-04-01 | 成都华西堂投资有限公司 | Pre-treatment method of absorbent for realizing rough purification of smoke |
| CN104888599A (en) * | 2015-05-28 | 2015-09-09 | 上海三融环保工程有限公司 | Spray drying desulfurizer used for cement plant and process method |
| CN106247364A (en) * | 2016-08-29 | 2016-12-21 | 大唐清苑热电有限公司 | A kind of online limestone is to powder system |
| CN108826278A (en) * | 2018-07-04 | 2018-11-16 | 山西建邦集团铸造有限公司 | A kind of fluidized-bed combustion boiler gas conveying desulfurizer and method |
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| JP2007191670A (en) * | 2006-01-20 | 2007-08-02 | Institute Of Strategy For Sustainable Solutions Co Ltd | System for producing alkaline soil-improving material, combined with flue-gas desulfurization |
| CN102210971A (en) * | 2010-04-07 | 2011-10-12 | 华盛江泉集团有限公司 | Circulating fluidized bed boiler desulfurizer |
| CN202263524U (en) * | 2011-10-14 | 2012-06-06 | 浙江宏宇环保工程设备有限公司 | In-furnace desulfurization device for high-efficiency desulfurization |
| CN102974211A (en) * | 2012-11-06 | 2013-03-20 | 镇江市电站辅机厂有限公司 | Circulating fluidized bed boiler in-furnace desulfurization device |
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2013
- 2013-11-01 CN CN201310531657.6A patent/CN103566751B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007191670A (en) * | 2006-01-20 | 2007-08-02 | Institute Of Strategy For Sustainable Solutions Co Ltd | System for producing alkaline soil-improving material, combined with flue-gas desulfurization |
| CN102210971A (en) * | 2010-04-07 | 2011-10-12 | 华盛江泉集团有限公司 | Circulating fluidized bed boiler desulfurizer |
| CN202263524U (en) * | 2011-10-14 | 2012-06-06 | 浙江宏宇环保工程设备有限公司 | In-furnace desulfurization device for high-efficiency desulfurization |
| CN102974211A (en) * | 2012-11-06 | 2013-03-20 | 镇江市电站辅机厂有限公司 | Circulating fluidized bed boiler in-furnace desulfurization device |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104474880A (en) * | 2014-12-02 | 2015-04-01 | 成都华西堂投资有限公司 | Pre-treatment method of absorbent for realizing rough purification of smoke |
| CN104888599A (en) * | 2015-05-28 | 2015-09-09 | 上海三融环保工程有限公司 | Spray drying desulfurizer used for cement plant and process method |
| CN106247364A (en) * | 2016-08-29 | 2016-12-21 | 大唐清苑热电有限公司 | A kind of online limestone is to powder system |
| CN108826278A (en) * | 2018-07-04 | 2018-11-16 | 山西建邦集团铸造有限公司 | A kind of fluidized-bed combustion boiler gas conveying desulfurizer and method |
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| CN103566751B (en) | 2016-04-13 |
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