CN102728181B - Fluidized bed jetting adsorbent smoke demercuration device and method thereof - Google Patents
Fluidized bed jetting adsorbent smoke demercuration device and method thereof Download PDFInfo
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- CN102728181B CN102728181B CN201210255876.1A CN201210255876A CN102728181B CN 102728181 B CN102728181 B CN 102728181B CN 201210255876 A CN201210255876 A CN 201210255876A CN 102728181 B CN102728181 B CN 102728181B
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Abstract
The invention discloses a fluidized bed jetting adsorbent smoke demercuration device and a method of the fluidized bed jetting adsorbent smoke demercuration device. The device comprises a smoke bypass, an adsorbent conveying part, a fluidized bed (6), a powder scatterer (12) and a dust collector (13), wherein the smoke bypass comprises a cyclone separator (3), a control valve (4), a fan (5) and corresponding pipelines; the adsorbent conveying part comprises a screw feeder (10) and a storage bin (11); the fluidized bed (6) comprises the main part of the fluidized and jetted adsorbent powder. The method comprises the following steps of extracting the smoke from the upper stream of a boiler flue (2) between an air preheater (1) and the dust collector (13) by the fan (5), removing the fly ash by the cyclone separator (3), and sending the smoke to an air chamber (8) of the fluidized bed (6). According to the fluidized bed jetting adsorbent smoke demercuration device provided by the invention, the problem that the powder absorbent is jetted non-uniformly during the smoke jetting demercuration is solved, and the reaction degree of the adsorbent and the mercuric in the smoke is simultaneously increased.
Description
Technical field
The present invention relates to a kind of fluidised-bed spray adsorbent flue gas mercury removal device, be applicable to the Powdered adsorbents such as coal fired power plant, garbage incineration power plant back-end ductwork injection active carbon and remove the pollutants such as mercury, belong to Coal-smoke Air Pollution thing control field.
Background technology
Mercury is a kind of can circulation in the world, in vivo with food chain in the noxious material of permanent accumulation, can cause the poisoning and Form pathology of people's nerve, methyl mercury also can damage chromosome, thereby gene are exerted an influence.
As the artificial mercury emissions pollution sources of current maximum, the mercury control of coal fired power plant is very urgent.It is an effective mercury pollution control technology that active carbon sprays demercuration technology, the U.S. has carried out the Commercial Demonstration of active carbon injection demercuration, but almost in open source literature, do not deliver as trade secret, and China is still in the starting stage, not yet carry out the Commercial Demonstration of coal fired power plant mercury pollution control.Domestic existing industrialization powdered active carbon sprays the technology that removes and also exists active carbon powder dispersion inhomogeneous, the active carbon time of staying is too short, the problem such as cause that thus charcoal absorption performance can not be given full play to, this will increase the consumption of active carbon undoubtedly, increase operating cost.
Summary of the invention
Technical problem: the present invention is directed to the active carbon powder existing in prior art and disperse the deficiency inhomogeneous, the active carbon time of staying is short, a kind of fluidised-bed spray adsorbent flue gas mercury removal device is provided, this device has used the entrainment characteristics of fluidization technology and fluid bed, utilize flue gas as fluidized wind fluidisation absorbent powder, increased dispersing uniformity and the time of staying of absorbent powder in flue gas.
Technical scheme: for solving the problems of the technologies described above, the invention provides a kind of fluidised-bed spray adsorbent flue gas mercury removal device, device comprises gas bypass, adsorbent transport portion, fluid bed and powder all loose device and deduster;
Wherein, gas bypass partly comprises cyclone separator, control valve, blower fan and corresponding pipeline; Adsorbent transport portion comprises screw(-type) feeder and feed bin; Fluid bed comprises the main part that absorbent powder fluidisation is sprayed;
Fluid bed right side is connected with blower fan, and blower fan is connected with cyclone separator by control valve; Cyclone separator communicates with boiler flue by fluidized wind fume gas extraction port; In the one end near the boiler flue of fluidized wind fume gas extraction port, be provided with air preheater, at the other end of boiler flue, be provided with deduster;
Fluid bed left side is connected with screw(-type) feeder, and feed bin is connected with screw(-type) feeder;
Fluid bed top and powder all loose device are connected, and powder is the direct insertion boiler flue of dispersion pipe part of loose device all;
Fluid bed bottom communicates with air compartment, between air compartment and fluid bed, air distribution plate is set.
Preferably, described adsorbent comprises wherein one or more such as active carbon, biomass char, flyash.
Preferably, the blend that the bed material of fluid bed is quartz sand and absorbent powder, quartz sand particle size is 0.5-1mm, absorbent powder particle diameter is less than 300 microns.
Preferably, powder all loose device comprise flow control valve, female pipe, header and the dispersion pipe of serial connection successively; Dispersion pipe is the steel pipe of surrounding perforate.
Preferably, deduster is sack cleaner.
The present invention also provides a kind of fluidised-bed spray adsorbent flue gas hydrargyrum-removing method, the method comprises the steps: that blower fan extracts flue gas from the boiler flue upstream between air preheater and deduster, after cyclone separator is removed flying dust, send into the air compartment of fluid bed, after air distribution plate current-sharing, the material in fluid bed is the blend of quartz sand and absorbent powder; Quartz sand is in fluid bed bottom emulsion zone fluidisation, and in this process, the active carbon powder of emulsion zone contacts with fluidized wind, preferential absorption gaseous mercury wherein; Active carbon powder continues fluidisation on fluid bed top, after sedimental separation height, gas-solid proportions constant, powder is uniformly dispersed in air-flow, after be fluidized wind and carry secretly and take fluid bed out of; The gas-solid mixture mixing flowing out from fluid bed top, via powder all loose device enter in boiler flue, fully mix the mercury in absorption flue gas with flue gas in boiler flue; The active carbon powder and the flue gas that enter in boiler flue form Dual-Phrase Distribution of Gas olid, finally by deduster, together with the flying dust in flue gas, are hunted down and remove down, complete the adsorption process of activated carbon powder foot couple mercury in flue gas.
Beneficial effect: this device uses the entrainment characteristics of fluidization technology and fluid bed, utilize flue gas to spray active carbon powder as fluidized wind fluidisation, at powder, all under the effect of loose device, by dispersion pipe, in flue, be uniformly distributed and fully mix with flue gas in flue, compared with prior art, the dispersing uniformity of active carbon powder and the time of staying in flue gas thereof have been increased, contact area and the time of contact of active carbon powder and flue gas have been improved, improved the serviceability of active carbon powder Adsorption of Mercury, thereby reduce the use amount of active carbon, improve economy.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention.
1 air preheater, 2 boiler flues, 3 cyclone separators, 4 control valves, 5 air-introduced machines, 6 fluid beds, 7 residue outlets, 8 air compartments, 9 air distribution plates, 10 screw(-type) feeders, 11 feed bins, 12 powder are loose device all, A fluidized wind fume gas extraction port, B air compartment entrance, C flue gas-active carbon powder in duct sorbent injection mouth;
Fig. 2 is all loose device structural representations of powder;
12-1 flow control valve in figure, the female pipe of 12-2,12-3 header, 12-4 dispersion pipe.
The specific embodiment
Below in conjunction with accompanying drawing, the present invention will be further described.
The invention discloses a kind of fluidised-bed spray adsorbent flue gas mercury removal device and method.This device has utilized the entrainment characteristics of fluidization technology and fluid bed, by gas bypass, adsorbent conveying, fluid bed and powder all loose device etc. partly form.Fluidized bed material is quartz sand particle and the small particle diameter absorbent powder of suitable granularity; From the coal-burning boiler flue upstream between air preheater and deduster, extract flue gas as fluid bed fluidized wind; Regulate air quantity and powder-feeding amount to match, realize the uniformity of outlet material distribution of particles; The fine grained being entrained with by gas through powder all loose device enter in flue, mix with gas in flue.This fluidised-bed spray adsorbent flue gas mercury removal device has solved the inhomogeneous problem of injection of Powdered adsorbent in flue gas injection demercuration process, has increased the time of staying of absorbent powder in flue gas simultaneously, has increased the extent of reaction of adsorbent and mercury in flue gas.
Utilize the entrainment characteristics of fluidization technology and fluid bed, at powder, all under the effect of loose device, realize the even injection of active carbon powder in flue gas.Concrete principle is as follows:
In fluid bed, it is rare that granule density is radially distributed as center, Bian Binong; Axial distribution is maximum near the granule density at bed face place, along with highly rising and diminish gradually, after reaching sedimental separation height, is steady state value; So, can, by the fluidised form in adjusting tolerance control fluid bed and the sedimental separation height of particle, the uniform particles in fluid bed exit is distributed, and concentration be setting value; The gas-solid mixture mixing flowing out from fluid bed top, via powder all loose device enter in flue, fully mix with flue gas in flue.
Referring to Fig. 1, Fig. 2, fluidised-bed spray adsorbent flue gas mercury removal device provided by the invention, this device comprises gas bypass, adsorbent transport portion, fluid bed 6 and powder all loose device 12 and deduster 13.
Wherein, gas bypass partly comprises cyclone separator 3, control valve 4, blower fan 5 and corresponding pipeline; Adsorbent transport portion comprises screw(-type) feeder 10 and feed bin 11; Fluid bed 6 comprises the main part that absorbent powder fluidisation is sprayed.
Described adsorbent comprises wherein one or more such as active carbon, biomass char, flyash.
The blend that the bed material of fluid bed 6 is quartz sand and absorbent powder, quartz sand particle size is 0.5-1mm, absorbent powder particle diameter is less than 300 microns.
Powder all loose device 12 comprises flow control valve 12-1, female pipe 12-2, header 12-3 and the dispersion pipe 12-4 of serial connection successively; Dispersion pipe 12-4 is the steel pipe of surrounding perforate.
The present invention also provides a kind of fluidised-bed spray adsorbent flue gas hydrargyrum-removing method, the method comprises the steps: that blower fan 5 extracts flue gas from boiler flue 2 upstreams between air preheater 1 and deduster 13, through cyclone separator 3, remove after flying dust, send into the air compartment 8 of fluid bed 6, after air distribution plate 9 current-sharings, the material in fluid bed 6 is the blend of quartz sand and absorbent powder; Quartz sand is in fluid bed 6 bottom emulsion zone fluidisations, and in this process, the active carbon powder of emulsion zone contacts with fluidized wind, preferential absorption gaseous mercury wherein; Active carbon powder continues fluidisations on fluid bed 6 tops, after sedimental separation height, gas-solid proportions constant, powder is uniformly dispersed in air-flow, after be fluidized wind and carry secretly and take fluid bed 6 out of; The gas-solid mixture mixing flowing out from fluid bed 6 tops, via powder all loose device 12 enter in boiler flue 2, fully mix the mercury in absorption flue gas with the interior flue gas of boiler flue 2; The active carbon powder and the flue gas that enter in boiler flue 2 gas form Dual-Phrase Distribution of Gas olid, finally by deduster 13, together with the flying dust in flue gas, are hunted down and remove down, complete the adsorption process of activated carbon powder foot couple mercury in flue gas.
Apparatus of the present invention have been used the entrainment characteristics of fluidization technology and fluid bed, utilize flue gas as the fluidized wind of fluid bed.With reference to accompanying drawing 1, accompanying drawing 2, apparatus of the present invention workflow is as follows:
Air-introduced machine 5 extracts flue gas from boiler flue 2 upstreams between air preheater 1 and deduster 13, through cyclone separator 3, removes after flying dust, sends into the air compartment 8 of fluid bed 6, after air distribution plate 9 current-sharings, and the material in fluid bed 11; Material in fluid bed 6 is the blend of quartz sand and absorbent powder, and quartz sand particle size is 0.5-1mm, and absorbent powder particle diameter is less than 300 microns, and people, for causing granularity and density contrast, is not carried secretly quartz sand; Quartz sand is in fluid bed 6 bottom emulsion zone fluidisations, and in this process, the active carbon powder of emulsion zone contacts with fluidized wind, preferential absorption gaseous mercury wherein; Active carbon powder continues fluidisations on fluid bed 6 tops, after sedimental separation height, gas-solid proportions constant, powder is uniformly dispersed in air-flow, after be fluidized wind and carry secretly and take fluid bed 6 out of; The gas-solid mixture mixing flowing out from fluid bed 6 tops, via powder all loose device 12 enter in flue, fully mix the mercury in absorption flue gas with flue gas in flue; The active carbon powder and the flue gas that enter in flue gas form Dual-Phrase Distribution of Gas olid, finally by deduster 13, together with the flying dust in flue gas, are hunted down and remove down, complete the adsorption process of activated carbon powder foot couple mercury in flue gas; In addition, if use deduster 13, be sack cleaner, the filter cake that active carbon powder forms on sack cleaner can continue to contact with flue gas, further removes the gaseous mercury in flue gas.
Give air quantity and flow control valve 12-1 by adjusting blower fan 5 realize the control that enters adsorbent flow in flue to spraying; By regulating mating of blower fan 5 air quantity and screw(-type) feeder 10 powder-feeding amounts, control the fluidised form of fluid bed inside, regulate the sedimental separation height of material, make active carbon powder granule density before exporting reach steady state value, realize the uniformity of distribution of particles.
The foregoing is only better embodiment of the present invention; protection scope of the present invention is not limited with above-mentioned embodiment; in every case the equivalence that those of ordinary skills do according to disclosed content is modified or is changed, and all should include in the protection domain of recording in claims.
Claims (5)
1. a fluidised-bed spray adsorbent flue gas mercury removal device, is characterized in that: this device comprises gas bypass, adsorbent transport portion, fluid bed (6) and powder all loose device (12) and deduster (13);
Wherein, gas bypass partly comprises cyclone separator (3), control valve (4), blower fan (5) and corresponding pipeline; Adsorbent transport portion comprises screw(-type) feeder (10) and feed bin (11); Fluid bed (6) comprises the main part that absorbent powder fluidisation is sprayed;
Fluid bed (6) right side is connected with blower fan (5), and blower fan (5) is connected with cyclone separator (3) by control valve (4); Cyclone separator (3) communicates with boiler flue (2) by fluidized wind fume gas extraction port (A); In the one end near the boiler flue (2) of fluidized wind fume gas extraction port (A), be provided with air preheater (1), at the other end of boiler flue (2), be provided with deduster (13);
Fluid bed (6) left side is connected with screw(-type) feeder (10), and feed bin is connected with screw(-type) feeder (10);
Fluid bed (6) top and powder all loose device (12) are connected, and powder is the direct insertion boiler flue (2) of dispersion pipe (12-4) part of loose device (12) all;
Fluid bed (6) bottom communicates with air compartment (8), between air compartment (8) and fluid bed (6), air distribution plate (9) is set;
Powder all loose device (12) comprises flow control valve (12-1), female pipe (12-2), header (12-3) and the dispersion pipe (12-4) of serial connection successively; Dispersion pipe (12-4) is the steel pipe of surrounding perforate.
2. fluidised-bed spray adsorbent flue gas mercury removal device according to claim 1, is characterized in that: described adsorbent comprises active carbon, biomass char, wherein one or more of flyash.
3. fluidised-bed spray adsorbent flue gas mercury removal device according to claim 1, is characterized in that: the bed material of fluid bed (6) is the blend of quartz sand and absorbent powder, and quartz sand particle size is 0.5-1mm, and absorbent powder particle diameter is less than 300 microns.
4. fluidised-bed spray adsorbent flue gas mercury removal device according to claim 1, is characterized in that: deduster (13) is sack cleaner.
5. the demercuration method of a fluidised-bed spray adsorbent flue gas mercury removal device as claimed in claim 1, it is characterized in that: the method comprises the steps: that blower fan (5) extracts flue gas from boiler flue (2) upstream between air preheater (1) and deduster (13), through cyclone separator (3), remove after flying dust, send into the air compartment (8) of fluid bed (6), after air distribution plate (9) current-sharing, the material in fluid bed (6) is the blend of quartz sand and absorbent powder; Quartz sand is in fluid bed (6) bottom emulsion zone fluidisation, and in this process, the active carbon powder of emulsion zone contacts with fluidized wind, preferential absorption gaseous mercury wherein; Active carbon powder continues fluidisation on fluid bed (6) top, after sedimental separation height, gas-solid proportions constant, powder is uniformly dispersed in air-flow, after be fluidized wind and carry secretly and take fluid bed (6) out of; The gas-solid mixture mixing flowing out from fluid bed (6) top, via powder all loose device (12) enter in boiler flue (2), fully mix with interior the flue gas of boiler flue (2), adsorb the mercury in flue gas; The active carbon powder and the flue gas that enter in boiler flue (2) gas form Dual-Phrase Distribution of Gas olid, finally by deduster (13), together with the flying dust in flue gas, are hunted down and remove down, complete the adsorption process of activated carbon powder foot couple mercury in flue gas.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210255876.1A CN102728181B (en) | 2012-07-23 | 2012-07-23 | Fluidized bed jetting adsorbent smoke demercuration device and method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210255876.1A CN102728181B (en) | 2012-07-23 | 2012-07-23 | Fluidized bed jetting adsorbent smoke demercuration device and method thereof |
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| Publication Number | Publication Date |
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| CN102728181A CN102728181A (en) | 2012-10-17 |
| CN102728181B true CN102728181B (en) | 2014-05-07 |
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