CN208136188U - A kind of flue gas purification system of fire coal coupled biological matter gasification - Google Patents
A kind of flue gas purification system of fire coal coupled biological matter gasification Download PDFInfo
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- CN208136188U CN208136188U CN201820642033.XU CN201820642033U CN208136188U CN 208136188 U CN208136188 U CN 208136188U CN 201820642033 U CN201820642033 U CN 201820642033U CN 208136188 U CN208136188 U CN 208136188U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
- Y02P20/129—Energy recovery, e.g. by cogeneration, H2recovery or pressure recovery turbines
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/50—Improvements relating to the production of bulk chemicals
Abstract
The utility model provides a kind of flue gas purification system of coal-fired coupled biological matter gasification, including：Sequentially connected biomass gasifying furnace, hot precipitator, waste-heat recovery device, boiler, denitrification apparatus, preposition deduster, circulating fluidized bed dry desulfuration absorbing tower, postposition deduster, air-introduced machine, chimney；Gasify ash cellar, and the feed inlet of the gasification ash cellar is connect with the ash discharging hole of the hot precipitator；Pre-mixing apparatus, the first charging aperture of the pre-mixing apparatus and gasification ash cellar outlet connect, and second charging aperture is connect with quick lime storehouse；Digester, the ash inlet of the digester and the ash hole of pre-mixing apparatus connect；The ash inlet in absorbent storehouse, the absorbent storehouse is connect with the ash hole of the digester, and ash hole is connect with the ash inlet of circulating fluidized bed dry desulfuration absorbing tower.By using biogas ashing and quick lime mixture slaking, as circulating fluidized bed dry sulfur removal technology absorbent, there is higher adsorption efficiency to multiple pollutants such as tar, bioxin.
Description
Technical field
Gasify the utility model relates to coal-fired coupled biological matter technical field more particularly to a kind of coal-fired coupled biological matter
Flue gas purification system.
Background technique
2016, China signed together with other countries《Paris climate change agreement》, China's promise to the year two thousand twenty, I
Than 2005 decline 60%-65% of state's per GDP carbon dioxide, the non-fossil energy account for non-renewable energy consumption ratio and weigh to 20%
Left and right.China starts quickly to step into the low-carbon energy epoch.
Biomass has neutral carbon attribute, and China's carbon intensity can be greatly reduced using biomass as energy carrier.Mesh
Preceding biomass mainly uses the Land use systems of direct combustion, i.e., boiler combustion power generation will be sent into after biomass collection, but biomass direct-fired
Power plant is there are cost of investment height, the problems such as fuel cost is high, system complex, operation and maintenance cost is big, especially contains in biomass
It measures higher alkali metal and easily causes boiler heating surface deposition and etching problem, cause boiler thermal efficiency to reduce, maintenance cost is high.
Biomass carbonization degree is low, and volatile matter content is high, and the advanced promoting the circulation of qiization of biomass is formed synthesis gas, then by synthesis gas
With coal-fired multifuel combustion in feeding boiler, it can not only make full use of content in the effective component in biomass, but also avoidable biomass higher
Alkali metal cause boiler heating surface deposition and corrosion, improve boiler efficiency, system is simple, is with a wide range of applications.
Pollutant kind is complicated in the coal-fired flue gas generated with biomass synthesis gas burning, not only there is SO2、SO3, NOx, powder
Common pollutant in the coal-fired flue-gas such as dirt, Hg, HCl, HF, mercury, and generate containing gasification of biomass and combustion process residual
The noxious materials such as remaining tar light oil, bioxin need to carry out these multiple pollutants to cooperate with high-efficient purification processing.At present not yet
The flue gas multiple pollutant purification techniques for thering is large-scale promotion application to gasify in coal-fired coupled biological matter.
By taking biomass direct-fired power plant as an example, referring especially to coal-burning power plant, the minimum discharge of coal-burning power plant is more for gas cleaning
It is the flue gases purification route using wet limestone-gypsum FGD as core, for multi-pollutant using Wet technique route
Removing only simply by kinds of processes superposition realize, such as using SCR/SNCR removing NOx, using lime stone/stone
Cream wet desulphurization removes SO2, spray using electrostatic precipitator/electrostatic fabric filter/bag filter removing flue dust, using active carbon
Technology removes heavy metal Hg, removes SO using wet electrical dust precipitator3, using flue gas heat-exchange unit eliminate white cigarette, using zero-emission at
Reason system handles discharge of wastewater problem, technology path system flow length, complex process, investment and the operating cost of this superposing type
Height, and tar, bioxin not can be removed.
Utility model content
In view of this, the technical problem to be solved by the present invention is to provide a kind of cigarettes of coal-fired coupled biological matter gasification
Gas purification system can remove NOx, SO simultaneously2, flue dust, SO3, mercury, HCl, HF, the multiple pollutants such as tar, bioxin, can be used for
The gas cleaning of gasification of biomass and coal-fired coupling combustion technology.
The utility model provides a kind of flue gas purification system of coal-fired coupled biological matter gasification, including：
Sequentially connected biomass gasifying furnace, hot precipitator, waste-heat recovery device, boiler, denitrification apparatus, preposition dedusting
Device, circulating fluidized bed dry desulfuration absorbing tower, postposition deduster, air-introduced machine, chimney；
Gasify ash cellar, and the feed inlet of the gasification ash cellar is connect with the ash discharging hole of the hot precipitator, for collecting height
The biogas ashing of separation is trapped in warm deduster；
Pre-mixing apparatus, the first charging aperture of the pre-mixing apparatus and the gasification ash cellar outlet connect, second charging aperture and
The connection of quick lime storehouse, the mixing for biogas ashing and quick lime；
Digester, the ash inlet of the digester and the ash hole of pre-mixing apparatus connect, and form absorbent for digesting；
The ash inlet in absorbent storehouse, the absorbent storehouse is connect with the ash hole of the digester, ash hole and recycle stream
The ash inlet connection for changing bed dry desulfurization absorbing tower is absorbed for storing and absorbent being delivered to circulating fluidized bed dry desulfurization
Tower mixes with flue gas and carries out smoke absorption.
The utility model provides the dry technique route using circulating fluidized bed dry desulfurization as core, can remove simultaneously
NOx、SO2, flue dust, SO3, mercury, HCl, HF, the multiple pollutants such as tar, bioxin, can be used for gasification of biomass and coal-fired coupling
The gas cleaning of combination burning technology.
Preferably, atomizing lance is provided in the circulating fluidized bed dry desulfuration absorbing tower.
Preferably, the discharge port of the postposition deduster is connected with material-returning device, the cigarette for collecting postposition deduster
Dirt is recycled to circulating fluidized bed dry desulfuration absorbing tower.
Preferably, the absorbent is that digestion preparation is formed after gasification of biomass ash is mixed with quick lime, gasification of biomass
The mass ratio of ash and quick lime is 1：(1~5).
Preferably, the hot precipitator is cyclone dust collectors, in hot electrostatic precipitator, refractory ceramics filter collector
It is a kind of.
Preferably, the preposition deduster is cyclone dust collectors, electric precipitator, electric-bag complex dust collector, bag filter
One of or a variety of combinations.
Preferably, the postposition deduster is one of electric precipitator, electric-bag complex dust collector, bag filter or more
The combination of kind.
Compared with prior art, the utility model is using biogas ashing and quick lime mixture slaking, as recycle stream
The absorbent for changing bed dry desulfurizing process, makes full use of the alkali and alkaline earth metal ions of high-content in biogas ashing, high ratio
Surface area and high-carbon content digest after being sufficiently mixed biogas ashing with quick lime, and the ratio table of absorbent greatly improved
Area and adsorption activity obtain 90%~99% mercury removal rate and 99% tar light oil removal efficiency, realize mercury emissions
Less than 3 μ g/Nm3, dioxin emission < 0.1ng-TEQ/Nm3, the resource utilization on the spot of biogas ashing is not only realized,
And flue gas SO is realized under the premise of desulfurization Ca/S is greatly reduced2Minimum discharge, improve mercury He the absorption of bioxin
Efficiency reduces the absorbent consumption and cost of dry desulfurization, realizes the coal-fired multi-pollutant with gasification of biomass coupled system
Efficient synergistic purification has significant economic benefit and environmental benefit, further promotes fire coal with gasification of biomass and couples skill
The industrial applications of art.
Detailed description of the invention
Fig. 1 is the flue gas purification system structural schematic diagram of coal-fired coupled biological matter gasification provided by the utility model.
Specific embodiment
The utility model provides a kind of flue gas purification system of coal-fired coupled biological matter gasification, including：
Sequentially connected biomass gasifying furnace, hot precipitator, waste-heat recovery device, boiler, denitrification apparatus, preposition dedusting
Device, circulating fluidized bed dry desulfuration absorbing tower, postposition deduster, air-introduced machine, chimney；
Gasify ash cellar, and the feed inlet of the gasification ash cellar is connect with the ash discharging hole of the hot precipitator, for collecting height
The biogas ashing of separation is trapped in warm deduster；
Pre-mixing apparatus, the first charging aperture of the pre-mixing apparatus and the gasification ash cellar outlet connect, second charging aperture and
The connection of quick lime storehouse, the mixing for biogas ashing and quick lime；
The outlet of digester, the feed inlet and pre-mixing apparatus of the digester connects, and forms absorbent for digesting；
The feed inlet in absorbent storehouse, the absorbent storehouse is connect with the outlet of the digester, discharge port with it is ciculation fluidized
The feed inlet connection of bed dry desulfurization absorbing tower is absorbed for storing and absorbent being delivered to circulating fluidized bed dry desulfurization
Tower mixes with flue gas and carries out smoke absorption.
The utility model provides a kind of flue gas purification system suitable for the gasification of coal-fired coupled biological matter, using biomass
The flying dust (referred to as " biogas ashing ") and quick lime mixture slaking that gasification generates prepare absorbent, and biogas ashing contains
The alkali and alkaline earth metal ions of high-content also contain a large amount of unformed SiO such as potassium oxide, sodium oxide molybdena and calcium oxide2With carbon nanometer
Microstructure forms great specific surface area and micro pore shape abundant, and specific surface area is very big, and carbon content is higher, not only has
There is very strong desulphurizing ability, and there is very strong adsorption capacity.The utility model is mixed using biogas ashing and quick lime
It closes digestion and prepares absorbent, during mixture slaking, acutely anti-occurs for the alkali and alkaline earth metal ions of high-content in gasification ash
It answers, excites the surface pore structure and active sites of quick lime.The adsorbent of preparation has bigger specific surface than common calcium hydroxide
Circulating fluidized bed dry can be greatly decreased while keeping high desulfurization efficiency in product, preferably activity and stronger adsorption capacity
Quick lime consumption needed for desulfurization reduces operating cost, and helps to improve the adsorbing and removing efficiency to multi-pollutant.It solves
Absorbent consumption is higher caused by the existing poor quality height with price because of absorbent of circulating fluidized bed dry desulfurization at present asks
Topic, at the same improve to mercury in flue gas, tar Ji the pollutants such as bioxin adsorbing and removing ability, realize coal-fired and biomass
The flue gas multiple pollutant efficient synergistic purification of the electricity generation system of gasification coupling.
The flue gas purification system of fire coal coupled biological matter gasification provided by the utility model includes biomass gasifying furnace, biology
Pyrolytic gasification occurs in gasification furnace and generates synthesis gas for matter.
The biomass gasifying furnace can be biomass gasifying furnace well known to those skilled in the art, preferably fixed bed or
One kind of circle fluidized-bed gasification furnace；More preferably circle fluidized-bed gasification furnace.
The gasification of biomass heater outlet temperature is preferably 700~750 DEG C.
It further include the hot precipitator being connected with biomass gasifying furnace, for trapping the fly ash granule carried in synthesis gas.
Preferably, the hot precipitator is one kind of cyclone dust collectors, hot electrostatic precipitator, High Temperature Ceramic Filter.
The gasification of biomass ash content of the hot precipitator outlet is not more than 5g/Nm3。
Gas from hot precipitator come out after, into waste-heat recovery device, gas recovery waste heat.
The waste-heat recovery device outlet temperature is preferably 350~400 DEG C.
The middle cryogenic gas of waste-heat recovery device outlet is sent into boiler furnace under the action of booster fan, with fire coal in height
The lower co-fire of temperature.
The utility model is to the boiler and is not particularly limited, and can be the general boiler for fired coal combustion, preferably
One kind of coal-powder boiler or circulating fluidized bed boiler.More preferably circulating fluidized bed boiler.
The flue gas generated after boiler combustion initially enters denitrification apparatus and carries out denitration.
The denitrification apparatus is preferably one kind of SNCR or SCR.
When boiler is coal-powder boiler, the denitrification apparatus is preferably SCR.
When boiler is circulating fluidized bed boiler, the denitrification apparatus is preferably SNCR.
The denitration outlet NOx concentration is not more than 50mg/Nm3。
Gas after denitration then removes bulky grain flying dust through preposition deduster.
The preposition deduster be preferably cyclone dust collectors, electric precipitator, electric-bag complex dust collector, in bag filter
One or more combinations.
The preposition house outlet dust concentration is not more than 5g/Nm3。
The utility model is preferred, and the discharge port of the preposition deduster is connected with flyash library, preferably passes through flyash
Pneumatic conveyer connects preposition deduster and flyash library.
The flue dust that the preposition deduster is collected is delivered to the storage of flyash library by flyash Pneumatic conveyer.
Gas after the removing bulky grain flying dust come out by preposition deduster, absorbs into circulating fluidized bed dry desulfurization
Tower.
There are high density, the absorbent of violent turbulence and material particles bed in circulating fluidized bed dry desulfuration absorbing tower,
It after process water is sprayed into absorption tower by atomizing lance, is attached to absorbent and material particles surface and forms liquid film, in flue gas
SO2、SO3, the sour gas such as HCl, HF, NOx occur ionic reaction removing by liquid film trapping, with absorbent, it is mercury, bioxin, a small amount of
The substances such as tar light oil are absorbed the porous structure adsorbing and trapping of agent.
The circulating fluidized bed dry desulfuration absorbing tower entrance flue gas temperature is preferably 120~150 DEG C.
Exit gas temperature is preferably 10~15 DEG C of water dew point or more, in certain specific embodiments of the utility model,
Exit gas temperature is specially 70~95 DEG C.
Export SO2Concentration is preferably no greater than 35mg/Nm3。
Meanwhile the PM in flue gas2.5Coalescence occurs in absorption tower and forms bulky grain for submicron order fine grained, into postposition
After deduster, be captured removing.
The postposition deduster is preferably one of electric precipitator, electric-bag complex dust collector, bag filter or a variety of
Combination.
The postposition house outlet dust concentration is preferably no greater than 10mg/Nm3。
The utility model is preferred, and the discharge port of the postposition deduster is connected with material-returning device and Desulphurization library, preferably
Postposition deduster and Desulphurization library are connected by Desulphurization Pneumatic conveyer.
The flue dust that the postposition deduster is collected largely passes through material-returning device and sends circulating fluidized bed dry desulfurization absorption back to
Tower, remaining is delivered to Desulphurization library by Desulphurization Pneumatic conveyer and stores.
Pass through the collective effect of circulating fluidized bed dry desulfuration absorbing tower and postposition deduster, various pollutants in fume quilt
Efficient removal is cooperateed with, and reaches minimum discharge standard.Chimney is discharged under air-introduced machine effect in purified flue gas.
Absorbent in above-mentioned circulating fluidized bed dry desulfuration absorbing tower is gasification of biomass ash and quick lime mixture slaking
Substance afterwards.Its preparation facilities includes gasification ash cellar, quick lime storehouse, pre-mixing apparatus, digester and absorbent storehouse.
The feed inlet of the gasification ash cellar is connect with the ash discharging hole of the hot precipitator, for collecting in hot precipitator
Trap isolated biogas ashing.
The first charging aperture of the pre-mixing apparatus and gasification ash cellar outlet connect, and second charging aperture and quick lime storehouse connect
It connects, the mixing for biogas ashing and quick lime.
The pre-mixing apparatus is preferably one of fluidized bed type, rotary, stirring-type or a variety of combinations.
The mass ratio of the biogas ashing and quick lime is preferably 1:(1~5).
Digester, the ash inlet of the digester and the ash hole of pre-mixing apparatus connect, and form absorbent for digesting.
The digester is preferably three-level Dry slaker.
The ash inlet in absorbent storehouse, the absorbent storehouse is connect with the ash hole of the digester, ash hole and recycle stream
The ash inlet connection for changing bed dry desulfurization absorbing tower is absorbed for storing and absorbent being delivered to circulating fluidized bed dry desulfurization
Tower mixes with flue gas and carries out smoke absorption.
The biogas ashing that hot precipitator traps by Pneumatic conveyer send to gasification ash cellar, quick lime by
Tank car is delivered to quick lime storehouse, after biogas ashing and quick lime are mixed in pre-mixing apparatus by orlop baiting control device
It is delivered to multi-stage dry digester, digestion generates highly active absorbent.The absorbent prepared utilizes pneumatic conveying to absorbent
Storehouse is conveyed into absorption tower finally by charging gear and realizes pollutant removing.The utility model can by adjust gasification ash and
The mixed proportion of discharge quantity control the gasification ash and quick lime of quick lime.Absorbent is controlled according to absorption tower entrance pollutant concentration
Feeding coal.
In certain specific embodiments of the utility model, the flue gas purification system knot of the fire coal coupled biological matter gasification
Structure schematic diagram is as shown in Figure 1.
In figure, 1 biomass gasifying furnace, 2 hot precipitators, 3 waste-heat recovery devices, 4 boilers, 5 denitrification apparatus, 6 preposition are removed
Dirt device, 7 circulating fluidized bed dry desulfuration absorbing towers, 8 postposition dedusters, 9 pre-mixing apparatus, 10 digesters, F1 booster fan, F2 draw
Blower, S1 biogas ashing Pneumatic conveyer, S2 flyash Pneumatic conveyer, S3 absorbent Pneumatic conveyer, S4
Desulphurization Pneumatic conveyer, B11 gasification ash cellar, B12 quick lime storehouse, B2 flyash library, B3 absorbent storehouse, B4 Desulphurization library.
The flue gas purification system of above-mentioned fire coal coupled biological matter gasification, is applied to gasification of biomass with coal-burning boiler and couples work
Skill has been sequentially arranged according to the generation of flue gas, purification and discharge process：Biomass gasifying furnace 1, hot precipitator 2, waste heat return
Receiving apparatus 3, booster fan F1, boiler 4, denitrification apparatus 5, preposition deduster 6, circulating fluidized bed dry desulfuration absorbing tower 7, postposition
Deduster 8, air-introduced machine F2 and chimney.The absorbent of circulating fluidized bed dry desulfuration absorbing tower 7 is trapped by hot precipitator 2 and is separated
Biogas ashing and quick lime be prepared jointly, capital equipment include gasification ash cellar B11, quick lime storehouse B12, load in mixture in advance
Set 9, digester 10, absorbent Pneumatic conveyer S3, absorbent storehouse B3 and some adjustings and charging gear.
The biomass gasifying furnace 1 exports the air inlet for being connected to hot precipitator 2, the gas outlet of hot precipitator 2
It is connected to the air inlet of waste-heat recovery device 3, the gas outlet of waste-heat recovery device is connected to the air inlet side of booster fan F1, boiler
4 gas inlet connects the biomass gasified synthesis gas from booster fan F1.After synthesis gas and fire coal burn in boiler
Flue gas from the exhanst gas outlet of boiler 4 be discharged, into denitrification apparatus 5, the exhanst gas outlet of denitrification apparatus 5 is connected to preposition deduster
The ash discharging hole of 6 air inlet, preposition deduster 6 is connected with the ash inlet of flyash Pneumatic conveyer S2, flyash strength
The ash hole of conveying device S2 is connected to flyash library B2.The gas outlet of preposition deduster 6 and circulating fluidized bed dry desulfurizing tower 7
Smoke inlet be connected, the exhanst gas outlet of circulating fluidized bed dry desulfurizing tower 7 is connected to the air inlet of postposition deduster 8.Afterwards
It sets the ash discharging hole of deduster 8 while connecting circulating ash import and the Desulphurization pneumatic conveying dress of circulating fluidized bed dry desulfurizing tower 7
Set the ash inlet of S4.The ash hole of Desulphurization Pneumatic conveyer S4 is connected to Desulphurization library B4.The gas outlet of postposition deduster 8
It is sequentially connected air-introduced machine F2 and chimney, chimney is discharged in flue gas after purification.
2 ash discharging hole of hot precipitator is connected with the ash inlet of biogas ashing Pneumatic conveyer S1, biogas
The ash hole of ashing Pneumatic conveyer S1 is connected to gasification ash cellar B11.The ash inlet of quick lime storehouse B12 is connected in factory and prepares
Or the quick lime of outsourcing.The ash discharging hole of gasification ash cellar B11 and quick lime storehouse B12 is first connect with orlop baiting control device respectively,
It is connect again with the ash inlet of pre-mixing apparatus 9.The ash hole of pre-mixing apparatus 9 is connected with the ash inlet of digester 10.Absorbent gas
The ash inlet of power conveying device S3 connects the absorbent from digester 10, the ash hole of absorbent Pneumatic conveyer S3 and suction
Agent storehouse B3 is received to be connected.Finally, absorbent feeds circulating fluidized bed dry desulfuration absorbing tower 7 by the ash discharging hole of absorbent storehouse B3.
Its working principle is that：
Biomass gasifies under the action of gasifying agent in biomass gasifying furnace 1, and gasification temperature is 700-750 DEG C.
The synthesis gas generated gasify first after 2 dedusting of hot precipitator, into waste-heat recovery device 3.Temperature is synthesized after waste heat recycling
Degree is down to 350-400 DEG C, and at this temperature, the tar in synthesis gas will not condense.Then, synthesis gas is in booster fan
F1 is acted in lower feeding boiler 4 and coal-fired co-fire.The flue gas generated burn first after denitrification apparatus 5 removes NOx, enters
Preposition deduster 6 removes most flue dust.Flue gas after dedusting passes sequentially through circulating fluidized bed dry desulfuration absorbing tower 7 with after
Deduster 8 is set, flue-gas temperature is reduced to 70-95 DEG C from 120-150 DEG C, SO in flue gas2, NOx, flue dust, SO3, HF, HCl, mercury, two
The multiple pollutants such as Evil English, tar light oil are by efficient cooperation-removal.Chimney is discharged under air-introduced machine F2 effect in purified flue gas.
The biogas ashing separated in hot precipitator 2 is acted in biogas ashing Pneumatic conveyer S1
Under be delivered to gasification ash cellar B11, quick lime send to quick lime storehouse B12.Under orlop by adjusting gasification ash cellar and quick lime storehouse
Expect control device, the discharge quantity of control gasification ash and quick lime, and then controls the feed ratio of gasification ash and quick lime.Certain ratio
The gasification ash and quick lime of example uniformly mix in pre-mixing apparatus 9, are and then discharged into digester 10.By three-level dry slaking
Afterwards, the alkali and alkaline earth metal ions oxide in gasification ash and quick lime, mainly CaO, Na2O、K2O, reaction generate Ca
(OH)2,NaOH,KOH.The grey activation process that gasifies excites the active sites and microcellular structure on quick lime surface simultaneously, finally digests shape
At high activity, high-specific surface area, high absorption capacity absorbent.The absorbent prepared is made in absorbent Pneumatic conveyer S3
It is delivered to B3 storage in absorbent storehouse under, and according to the import pollutant concentration of circulating fluidized bed dry desulfuration absorbing tower 7, adjusts
Absorbent delivery rate accurately controls the feeding coal of absorbent, realizes the efficient cooperation-removal to pollutant.
The utility model additionally provides a kind of flue gas purifying method of coal-fired coupled biological matter gasification, includes the following steps：
A) biomass gasifies in biomass gasifying furnace, generates synthesis gas；
B) synthesis gas enters hot precipitator removal fly ash granule, enters back into waste-heat recovery device, recovery waste heat, then into
Enter boiler and fired coal combustion, generates flue gas；
C) flue gas enters denitrification apparatus progress denitration, subsequently into preposition dust-extraction unit, removing bulky grain flying dust；
D) step C) in flue gas after removing bulky grain flying dust enter circulating fluidized bed dry desulfuration absorbing tower, in flue gas
Pollutant is removed by the absorbent in circulating fluidized bed dry desulfuration absorbing tower；The pollutant include at least sour gas, mercury,
One of tar He bioxin are a variety of；
E) flue gas that circulating fluidized bed dry desulfuration absorbing tower comes out enters postposition deduster, and removing is dry in recirculating fluidized bed
The particulate matter formed in method desulfuration absorbing tower, the flue gas after being purified；
F) step B) in the fly ash granule that removes mixed in pre-mixing apparatus with quick lime, subsequently into being digested in digester
Absorbent is formed, is stored in absorbent storehouse, is entered back into circulating fluidized bed dry desulfuration absorbing tower as absorbent.
The step B) in, the partial size of fly ash granule is 100 μm~1mm.
The step C) in, the partial size of bulky grain flying dust is 30 μm~100 μm.
Ca/S in the circulating fluidized bed dry desulfuration absorbing tower is 1.3~1.4.
In certain specific embodiments of the utility model, the sour gas includes SO2、SO3, in HCl, HF and NOx
Any one or more.
The purified flue gas that the utility model obtains can be expelled directly out chimney under air-introduced machine effect.
The utility model is using biogas ashing and quick lime mixture slaking, as circulating fluidized bed dry sulfur removal technology
Absorbent, make full use of the alkali and alkaline earth metal ions of high-content, high-specific surface area and high-carbon content in biogas ashing,
It is digested after biogas ashing is sufficiently mixed with quick lime, the specific surface area and adsorption activity of absorbent greatly improved, obtain
90%~99% mercury removal rate and 99% tar light oil removal efficiency were obtained, realizes mercury emissions less than 3 μ g/Nm3, bioxin
Discharge < 0.1ng-TEQ/Nm3, the resource utilization on the spot of biogas ashing is not only realized, but also desulfurization is being greatly reduced
Flue gas SO is realized under the premise of Ca/S2Minimum discharge, improve mercury He the adsorption efficiency of bioxin, reduces dry desulfurization
Absorbent consumption and cost realize the coal-fired multi-pollutant efficient synergistic purification with gasification of biomass coupled system, have aobvious
The economic benefit and environmental benefit of work further promote the coal-fired industrial applications with gasification of biomass coupling technique.
In order to further illustrate the utility model, below with reference to embodiment to coal-fired coupled biological provided by the utility model
The flue gas purification system of matter gasification is described in detail.
Embodiment 1
The coal-fired coupled biological matter gasifying electricity generation factory of 2 220t/h scales, biomass type are rice husk, and every boiler generates
220000Nm3/ h exhaust gas volumn (dry mark), the original SO of boiler2Concentration is 1500mg/Nm3.Around existing plant area supply purity be 80%,
Specific surface area is 10m2The quick lime of/g, unit price are 400 yuan/ton.
Using the flue gas purification system of coal-fired coupled biological matter gasification described in the utility model, gasification ash is mixed with quick lime
Composition and division in a proportion example is 1:1.5, Ca/S 1.4, the demercuration efficiency of circulating fluidized bed dry sulfur removal technology is not less than 90%, can reach
99%, tar light oil removal efficiency 99%, 3 μ g/Nm of mercury emissions <3, dioxin emission < 0.1ng-TEQ/Nm3。
It is computed, every unit consumes 0.38 ton of quick lime 0.25 ton of gentle ashing per hour, runs 7000 hours per year
It calculates, the annual absorbent cost in the power plant is 212.8 ten thousand yuan.
Comparative example 1
The coal-fired coupled biological matter gasifying electricity generation factory of 2 220t/h scales, biomass type are rice husk, and every boiler generates
220000Nm3/ h exhaust gas volumn (dry mark), the original SO of boiler2Concentration is 1500mg/Nm3.Using the quick lime, meet SO2Ultralow row
It puts and multi-pollutant cooperation-removal requirement, Ca/S has reached 1.8, absorbent consumption is 0.65 ton to every unit per hour, per year
It runs 7000 hours and calculates, the annual absorbent cost in the power plant is up to 3,640,000 yuan.
Final demercuration efficiency is 68%, tar light oil removal efficiency 90%, mercury emissions<10μg/Nm3, dioxin emission<
0.5ng-TEQ/Nm3。
By above-described embodiment and comparative example it is found that after using purification system provided by the utility model, which every year may be used
Absorbent cost is saved up to 151.2 ten thousand yuan, and for removal efficiencies with higher such as tar, bioxin.
The method and its core concept of the above embodiments are only used to help understand the utility model.It should refer to
It out, for those skilled in the art, without departing from the principle of this utility model, can also be to this
Some improvement and modification can also be carried out for utility model, these improvement and modification also fall into the protection scope of the utility model claims
It is interior.
Claims (7)
1. a kind of flue gas purification system of fire coal coupled biological matter gasification, including：
Sequentially connected biomass gasifying furnace, hot precipitator, waste-heat recovery device, boiler, denitrification apparatus, preposition deduster,
Circulating fluidized bed dry desulfuration absorbing tower, postposition deduster, air-introduced machine, chimney；
Gasify ash cellar, and the feed inlet of the gasification ash cellar is connect with the ash discharging hole of the hot precipitator, removes for collecting high temperature
The biogas ashing of separation is trapped in dirt device；
Pre-mixing apparatus, the first charging aperture of the pre-mixing apparatus and gasification ash cellar outlet connect, second charging aperture and raw stone
Ash cellar connection, the mixing for biogas ashing and quick lime；
Digester, the ash inlet of the digester and the ash hole of pre-mixing apparatus connect, and form absorbent for digesting；
The ash inlet in absorbent storehouse, the absorbent storehouse is connect with the ash hole of the digester, ash hole and recirculating fluidized bed
The ash inlet of dry desulfurization absorbing tower connects, for storing and absorbent being delivered to circulating fluidized bed dry desulfuration absorbing tower,
It is mixed with flue gas and carries out smoke absorption.
2. flue gas purification system according to claim 1, which is characterized in that the circulating fluidized bed dry desulfuration absorbing tower
In be provided with atomizing lance.
3. flue gas purification system according to claim 1, which is characterized in that the discharge port of the postposition deduster is connected with
Material-returning device, fume recovery for collecting postposition deduster to circulating fluidized bed dry desulfuration absorbing tower.
4. flue gas purification system according to claim 1, which is characterized in that the absorbent is gasification of biomass ash and life
Digestion preparation is formed after lime mixing, and the mass ratio of biogas ashing and quick lime is 1：(1~5).
5. flue gas purification system according to claim 1, which is characterized in that the hot precipitator be cyclone dust collectors,
One of hot electrostatic precipitator, refractory ceramics filter collector.
6. flue gas purification system according to claim 1, which is characterized in that the preposition deduster be cyclone dust collectors,
One of electric precipitator, electric-bag complex dust collector, bag filter or a variety of combinations.
7. flue gas purification system according to claim 1, which is characterized in that the postposition deduster is electric precipitator, electricity
One of bag complex dust collector, bag filter or a variety of combinations.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108373936A (en) * | 2018-05-02 | 2018-08-07 | 福建龙净脱硫脱硝工程有限公司 | A kind of flue gas purification system and method for the gasification of fire coal coupled biological matter |
| CN115232646A (en) * | 2022-06-08 | 2022-10-25 | 童铨 | Biomass gasification hydrogen production recycling device |
-
2018
- 2018-05-02 CN CN201820642033.XU patent/CN208136188U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108373936A (en) * | 2018-05-02 | 2018-08-07 | 福建龙净脱硫脱硝工程有限公司 | A kind of flue gas purification system and method for the gasification of fire coal coupled biological matter |
| CN115232646A (en) * | 2022-06-08 | 2022-10-25 | 童铨 | Biomass gasification hydrogen production recycling device |
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