CN206652386U - A kind of minimum discharge purifier of burning city domestic garbage flue gas - Google Patents
A kind of minimum discharge purifier of burning city domestic garbage flue gas Download PDFInfo
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- CN206652386U CN206652386U CN201621485602.1U CN201621485602U CN206652386U CN 206652386 U CN206652386 U CN 206652386U CN 201621485602 U CN201621485602 U CN 201621485602U CN 206652386 U CN206652386 U CN 206652386U
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Abstract
The utility model discloses a kind of minimum discharge purifier of burning city domestic garbage flue gas, and the device includes smoke reflux device, SNCR denitration device, semidry method reaction tower, lime white and prepared and atomization jetting device, activated carbon and calcium hydroxide dry powder injection apparatus, sack cleaner, wet type extracting tower, 1# flue gases/flue gas heat-exchange unit, 2# flue gases/flue gas heat-exchange unit（2#GGH）, steam/flue gas heat-exchange unit（SGH）, SCR denitration device, air-introduced machine and chimney.Heated by 1#GGH, 2#GGH, SGH, enter back into SCR reactors and further remove the NO remained in flue gasxHe bioxin, pollutant concentration is finally better than the discharge standard of European Union 2000, realizes minimum discharge.
Description
Technical field
It the utility model is related to a kind of minimum discharge purifier of burning city domestic garbage flue gas.
Background technology
In recent years, burning city domestic garbage developed rapidly, domestic newly-built garbage incinerating power plant a lot.
Waste incineration and generating electricity is the effective means for handling domestic waste, both handles house refuse, reclaims the heat energy in rubbish again, but
Produced in Refuse Incineration Process, caused flue gas contains substantial amounts of pollutant along with flue gas.These polluters are main
Including heavy metal（Cd, Pb etc.）, sour gas（HF、HCl、SOx、NOxDeng）And bioxin etc., these substances on human can
Serious harm is brought, directly discharge can cause secondary pollution.Therefore, caused flue gas must during burning city domestic garbage
It must could be discharged after purifier processing reaches discharge standard.
Substantial amounts of NO can be produced in Refuse Incineration Processx, NOxGrowing amount mainly with ignition temperature in stove and rubbish chemistry
Composition is relevant.NO caused by burningxIt is divided into two kinds：One kind is thermal NOx；Another kind is fuel type NOx, wherein big portion
Divide NOxThe contained nitrogen that is formed as in rubbish formed.At present, garbage incinerating power plant removes Combustion System NOx, flue gas
Backflow is outer, the main group technology from SNCR and SCR or both.With regard to NOxRemoval effect for, SCR is to NOxGo
Except rate has reached more than 85%；And SNCR is to NOxClearance also can reach 60% or so；Smoke backflow is to NOxClearance
It can reach 20% or so.
Sour gas caused by consumer waste incineration is mainly SOx、HCl、HF.At present, deacidifying process mainly include dry method,
Wet method, semidry method etc..Single deacidifying process can not meet to require.The conventional deacidifying process combination in the country has " half-dried+dry
Method ", the combination can reach good deacidification efficiency, can meet present discharging standards.
Activated carbon often uses lignite activated carbon, and the active carbon powder can absorb the heavy metal such as Hg, Cd and Pb in flue gas, with
And the pollutant such as dioxin in flue gas, furans.
Sack cleaner, electrostatic precipitator and Venturi scrubber are the masters that the dust in incineration flue gas of household garbage removes
Want method.With the fast development of material subject, the service life of filtrate is greatly extended, sack cleaner is burnt in rubbish
Burn in fume treatment and occupy leading position.Flue gas entrainment dust enters sack cleaner, the acid in sack cleaner in flue gas
Property gas continue and calcium hydroxide reaction, activated carbon continue adsorb flue gas in heavy metal He bioxin.Various particles（Include flue gas
In flue dust, the activated carbon after the heavy metal of condensation, reaction product, reactant and absorption）It is attached to filter bag of dust collector table
Face, compressed air blowback are discharged into dust collector ash hopper, are sent into public drag conveyor by deduster drag conveyor, then pass through
Enter flying dust warehouse after bucket elevator and flying dust silo roof conveying worm.
Because harmful substances in flue gas complexity is various caused by waste incineration, so single technique can not meet that processing will
Ask, it is necessary to which Alternative combines.Group technology is not simple kinds of processes superposition, it is necessary to consider each process operating conditions, rationally
Arrangement can reduce the consumption of the energy and reach highest treatment effect.
Waste incinerated smoke purification system substantially uses two kinds or more of flue gas group technology at present, as semidry method+
Dry-process deacidification, activated carbon injection Xi Fu bioxin and sack cleaner dedusting etc..Because each technique simply combines, pollutant takes off
Except effect is limited, treated flue gas is extremely difficult to discharge standard（《Consumer waste incineration pollutant catabolic gene standard》
（GB18485-2014））With《European Union（2000/76/EC）》, especially《European Union（2000/76/EC）》It is required that smoke content is less than
10mg/m3, sulfur dioxide is less than 50 mg/m3, hydrogen chloride is less than 10mg/m3, hydrogen fluoride is less than 1mg/m3, dioxins
0.1ngTEQ/m3（More than every emission limit, to contain 11%O under standard state2Dry flue gas for reference value conversion it is average daily
Value）.
The content of the invention
The purpose of this utility model is under the conditions of minimum processing cost, realize minimum discharge.Cigarette in engineering
Gas cleaning system uses " SNCR（SNCR denitration）+ rotating spraying semidry method+dry-process deacidification+activated carbon spray
Penetrate absorption+sack cleaner+smoke reflux device+wet method depickling+1# flue gases/flue gas heat-exchange unit（1#GGH）+ 2# cigarette gas smokes
Gas heat exchanger（2#GGH）+ steam/flue gas heat-exchange unit（SGH）+SCR（It is selective-catalytic-reduction denitrified）" technology.Waste heat
After the system is handled, the pollutant concentration in flue gas is better than the flue gas of boiler export《European Union（2000/76/EC）》Flue gas row
Index limits are put, realize minimum discharge.
The technical principle of the utility model patent
In waste heat boiler flue by concentration for certain reducing agent spray under the hot conditions in burner hearth with NOxReaction,
By NOxNitrogen is changed into, completes first step denitration.Flue gas is after economizer exit（190~220℃）, enter semidry method from top
At the top of reaction tower, rotary atomizer is located at spray reactor top, and the lime white come from lime white compounding system enters rotation mist
Change device, due to the high-speed rotation of atomizer, lime white is atomized into fine droplet, the drop and the cigarette moved downward in the shape of a spiral
Gas forms adverse current, and is wrapped up in by huge flue gas stream with moving downward, in the process, lime white and the sour gas in flue gas
HCl、HF、SO2Etc. reacting, reaction product falls into reactor cone, and a part of reaction product is discharged by cone base,
Another part is contained in the flue gas for carrying under one's arms flying dust and various dust, enters next processing unit with flue gas.The cooling procedure
Also Shi bioxin, furans and heavy metal produce condensation.
Flue gas sprays active carbon powder and calcium hydroxide powder after semidry method reaction tower comes out directly into flue.Niter
Grey powder and sour gas HCl, SOxAnd the reaction such as HF, effectively can further it remove remaining in flue gas after semidry method is handled
Sour gas.Active carbon powder can absorb the organic contamination such as the heavy metal such as Hg and dioxin in flue gas, furans in flue gas
Thing.
Flue gas enters sack cleaner, the acid on the filter bag of sack cleaner in flue gas entrainment of flying dust and various dust
Property gas continue and calcium hydroxide reaction, activated carbon continue adsorb flue gas in heavy metal He bioxin.Various particles（Include flue gas
In flue dust, the activated carbon after the heavy metal of condensation, reaction product, reactant and absorption）It is attached to filter bag of dust collector table
Face, compressed air blowback are discharged into dust collector ash hopper, transported by dust conveying system to ash silo.
The flue gas that about 150 DEG C of sack cleaner outlet temperature, part of smoke enter waste heat boiler and carry out flue gas recirculation, separately
Part of smoke enters 1# flue gases/flue gas heat-exchange unit by lower entrances, and former flue gas is after tube side heat exchange cooling, under heat exchanger
Portion, which exports out, enters scrubbing tower lower half smoke inlet, and is run up in tower.Scrubbing tower by bottom cooling end and
Top dehumidification by absorption portion composition, the nozzle that coolant recirculation pump delivers to bottom of towe coolant above cooling end, downwards spray into
The flue gas of adverse current is fully contacted, and soda bath is delivered in coolant circulating line by caustic soda delivery pump after cooling, will be cooled down
The pH value of liquid maintains solutions of weak acidity.Meanwhile in the process in soda bath and flue gas part sour gas HCl, SO2
Etc. being reacted, the sour gas in absorbent solution.In addition, salinity indicating alarm is set on coolant circulating line,
The coolant discharge rate from the discharge of wet scrubbing tower bottom is adjusted, ensures that salinity remains stable.
The neat stress washed by wet type extracting tower passes sequentially through 1# flue gases-flue gas heat-exchange unit, 2# flue gases-flue gas heat exchange
Device and steam/flue gas heat-exchange unit heating, enter SCR reaction towers after being heated to the suitable temperature of catalyst.In SCR reaction towers
It is interior, the NO in flue gasXReacted in the presence of low temperature catalyst with reducing agent, further the remaining NO of removingx, after denitration purification
Flue gas enter air-introduced machine after 2# flue gases/flue gas heat-exchange unit, then be discharged into air to chimney.
The technical solution of the utility model
A kind of minimum discharge purifier of burning city domestic garbage flue gas includes smoke reflux device, SNCR denitration fills
Put, semidry method reaction tower, lime white are prepared and atomization jetting device, activated carbon and calcium hydroxide dry powder injection apparatus, bag-type dusting
Device, wet type extracting tower, 1# flue gases/flue gas heat-exchange unit（1#GGH）, 2# flue gases/flue gas heat-exchange unit（2#GGH）, steam/flue gas heat exchange
Device（SGH）, SCR denitration device, air-introduced machine and chimney, wherein smoke reflux device, SNCR denitration device, semidry method reaction tower,
Activated carbon can effectively slough pollutant in flue gas with lime dry powder injection apparatus and sack cleaner, and flue gas is through apparatus above
Pollutant concentration can substantially meet the pollutant emission standard of European Union 2000 after processing, be filled by increasing wet type extracting tower and SCR
Sour gas, NOx, dust and bioxin further reduced in flue gas etc. is put, realizes minimum discharge.
A kind of minimum discharge purifier of above-mentioned burning city domestic garbage flue gas, semidry method reaction tower top are provided with
Gas approach, side wall are provided with exhanst gas outlet, and bottom is provided with the outlet of flying dust；
Calcium hydroxide is provided with flue between semidry method reaction tower exhanst gas outlet and sack cleaner smoke inlet to spray
Device and activated carbon injection injection apparatus；
Sack cleaner smoke inlet is located at deduster bottom, and exhanst gas outlet is located at deduster top, with 1#GGH original cigarettes
Flue before gas entrance is provided with smoke reflux device, and sack cleaner bottom is provided with ash exhauster；
The former exhanst gas outlet that 1#GGH side walls the are provided with smoke inlet that wet type depickling tower side wall is provided with all the way is connected, separately
An if bypass connecting fan.Exhanst gas outlet, the exhanst gas outlet and the neat stress entrance at the top of 1#GGH are provided with the top of wet type extracting tower
It is connected；
It is connected after the outlet a-road-through piping valve I of 1#GGH neat stress with 2#GGH bottoms original smoke inlet, another way
1#GGH outlet is connected by pipeline through pipeline valve III with the entrance of air-introduced machine；
2#GGH bottoms original exhanst gas outlet is connected with SGH lower entrances, and SGH tops are provided with exhanst gas outlet, exhanst gas outlet with
SCR reaction tower top entries are connected；
SCR reaction tower bottoms are provided with exhanst gas outlet, are connected to 2#GGH neat stress entrances, pass through valve by 2#GGH outlet at bottoms
Door II connects air-introduced machine, and the outlet of air-introduced machine is connected with flue gas.
The pipeline that 1#GGH neat stress is exported between valve I is provided with a branch road and through valve III, and valve III is below and 2#
The pipeline that GGH bottom valves II export connects and together enters air-introduced machine.Its main function is when 2#GGH, SGH and SCR react
Device breaks down, it is necessary to when stopping transport, and flue gas directly can export connection air-introduced machine from 1#GGH, then be discharged by chimney.
Described half-dried reaction tower, top passageway are provided with deflector, flue gas can be made to move downward in the shape of a spiral.Rotary-atomizing
Device is located at spray reactor top, and the lime white come from lime white compounding system enters rotary atomizer, due to the height of atomizer
Speed rotation, lime white are atomized into fine droplet, and the drop and the flue gas moved downward in the shape of a spiral form adverse current, and huge
Flue gas stream wrap up in moving downward, in the process, lime white reacts with the sour gas in flue gas.In course of reaction
First stage, neutralization reaction occurs for solution-air contact, and the moisture in lime white drop is evaporated, at the same flue gas obtain it is cold
But；Second stage, gas-solid contact further neutralize and obtain dry solid-state reactants, and reaction product falls into reactor cone
Body, discharged by cone base.The cooling procedure also Shi dioxins and heavy metal produce condensation.
Described activated carbon injection apparatus is transported outward with calcium hydroxide dry powder injection apparatus, activated carbon and calcium hydroxide by tank car from factory
Come, carry compressor with tank car is sent into bunker by bunker feed pipe.Deduster is provided with the top of activated carbon and calcium hydroxide bunker,
Collect calcium hydroxide dust and discharge the conveying air for entering bunker.Storage bunker bottom is provided with broken arch, Air Fluidized device, to prevent
Material bridging and the mobility for keeping white lime, bottom are provided with metering device, and being delivered to injection apparatus by roots blower sprays into
Flue, the activated carbon and calcium hydroxide of penetrating start the pollutants such as absorbing acid gases, bioxin and heavy metal in flue,
Charcoal absorption does not have saturation, calcium hydroxide and sour gas yet not fully reaction in flue, then enters together with flue gas
Enter absorption in sack cleaner on filter bag surface, fully to contact with the flue gas by filter bag surface, be finally reached removal flue gas
The purpose of middle sour gas, bioxin and heavy metal.
Described sack cleaner can not only remove particulate matter, and can improve desulfuration efficiency, improve heavy metal and
The clearance of bioxin.Sack cleaner uses long-bag low-pressure pulse structure, the pure PTFE+PTFE overlay films filter of filtrate material selection
Bag, to prevent ash bucket from condensing and gluing ash, ash bucket uses electric tracer heating system.
Described wet type depickling Tower System is mainly taken off by wet type extracting tower, dehumidification water tank, dehumidification liquid heat exchanger, wet type
Acid tower subsidiary water tank, caustic soda storage tank, sodium hydroxide thinning tank, pump and control instrument etc. form.Scrubbing tower by bottom cooling end
Form, the nozzle that coolant recirculation pump delivers to bottom of towe coolant above cooling end, spray into downwards with the dehumidification by absorption portion on top
Fully contacted with the flue gas of adverse current, flue-gas temperature is gradually reduced.20% soda bath is delivered to cooling by caustic soda delivery pump
In liquid circulating line, the pH value of coolant is maintained into weak acid.Meanwhile in the process in soda bath and flue gas part acid
Property gas HCl, SO2Etc. being reacted, in order to keep the concentration of salt in coolant, salinity is set on coolant circulating line
Indicating alarm, adjust the coolant discharge rate from the discharge of wet type depickling tower bottom.
Described 1#GGH, 2#GGH, SGH is pipe heat exchanger.
Certain density reducing agent is sprayed into mixed flue gas and entered in SCR reactors by described SCR reactors, in catalyst
In the presence of reacted with the nitrogen oxides in flue gas, entered after generating harmless nitrogen and water vapour by SCR reactor afterbodys
Enter air-introduced machine entrance.
A kind of minimum discharge purifier of above-mentioned burning city domestic garbage flue gas, its operating path are as follows：
SNCR systems are sprayed reductant into waste heat boiler flue, complete first step denitration, flue gas is after economizer from upper
Portion enters semidry method reaction tower, is reacted with the lime white of atomization, completes first step depickling；Flue gas comes out from semidry method reaction tower
Afterwards, active carbon powder and calcium hydroxide powder are sprayed directly into flue, it is preliminary to adsorb and absorb sour gas, two Evil in flue gas
English and heavy metal ion, then flue gas entrainment dust enter sack cleaner, further depickling is completed in sack cleaner, and
The pollutants such as removing heavy metals and bioxin are removed, the flue gas fraction come out from sack cleaner enters flue gas recirculation, reduces NOx
Growing amount；Another part cools into 1#GGH heat exchangers, and flue gas further removes remnants' into wet type extracting tower after cooling
Sour gas, the flue gas after depickling sequentially enter 1#GGH, 2#GGH, SGH heating, and the flue gas after heating enters SCR reactors
The remaining NO of progressive removingx, the flue gas after purification enters 2#GGH, and flue gas is discharged into air after heating through air-introduced machine, chimney.
The beneficial effects of the utility model
A kind of minimum discharge purifier of burning city domestic garbage flue gas of the present utility model, is filled using smoke backflow
Put, SNCR denitration device, semidry method reaction tower, lime white are prepared and sprayed with atomization jetting device, activated carbon and calcium hydroxide dry powder
Device, sack cleaner, wet type extracting tower, 1# flue gases/flue gas heater, 2# flue gases/flue gas heater steam heater, SCR
Denitrification apparatus, various pollutants processing has multi-stage treatment units, therefore has more in pollutants such as desulphurization denitration, Chu bioxin
Big superiority.First, NO is reduced in smoke reflux devicexGrowing amount, further using SNCR devices remove flue gas in
NOx, flue gas enters semidry method reaction tower after economizer from top, in tower top using rotary atomizer penetrating lime white, cigarette
Sour gas in gas completes first step depickling with lime white；The flue gas after first step depickling is completed to come out from semidry method reaction tower
Afterwards, by spraying active carbon powder and calcium hydroxide powder, absorption and absorb sour gas, bioxin and heavy metal in flue gas from
Son, completes to absorb and the calcium hydroxide of absorption and active carbon powder fully react in sack cleaner, and by deduster by powder
Dirt separates, and further eliminates sour gas, bioxin and heavy metal ion, and the sour gas remained in flue gas, dust enter
Wet type extracting tower absorbing and removing again, after wet scrubber tower, temperature reduces flue gas, to ensure the treatment effeciency of SCR reactors,
Heated by 1#GGH, 2#GGH, SGH, enter back into SCR reactors and further remove the NO remained in flue gasxHe bioxin.
A kind of minimum discharge purifier of burning city domestic garbage flue gas of the present utility model is used for urban life rubbish
After the purified treatment of rubbish incineration flue gas, flue dust 5mg/Nm in the flue gas of discharge3, HCl 10mg/Nm3, HF1mg/Nm3, SO210mg/
Nm3, NOx50mg/Nm3, CO10mg/Nm3, Hg0.02mg/Nm3The ng-TEQ/Nm of , bioxin 0.023（Every discharge value above,
To contain 11%O under standard state2Dry flue gas be reference value conversion annual average）, meet European Union 2000/76/EC discharge mark
Standard, wherein flue dust, SO2, NOx, CO, the discharge value such as Hg, bioxin be superior to European Union 2000/76/EC emission limit, realize super
Low emission.
Brief description of the drawings
Fig. 1 is the structural representation of flue gas integrated purifying processing unit of the present utility model.
Embodiment
The utility model patent is expanded on further below by specific implementation example with reference, but is not intended to limit this
Utility model.
Embodiment 1
A kind of minimum discharge purifier of burning city domestic garbage flue gas, its structural representation as shown in figure 1, including
Smoke reflux device 7, SNCR denitration device（Do not provided in schematic diagram, belong to denitration in the stove）, semidry method reaction tower 1（Lime white
Preparation and atomization jetting device）, activated carbon injection apparatus 3, calcium hydroxide dry powder injection apparatus 4, sack cleaner 5,1# cigarette gas smokes
Gas heat exchanger 8（GGH）, wet type extracting tower 9,2# flue gases/flue gas heat-exchange unit 11（GGH）, steam/flue gas heat-exchange unit 12（SGH）、
SCR denitration device 13, reductant storage device 14, air-introduced machine 15 and chimney 16.
The top of semidry method reaction tower 1 is provided with gas approach, and side wall is provided with exhanst gas outlet, and bottom is provided with the outlet 2 of flying dust；
Calcium hydroxide is provided with flue between the half-dried exhanst gas outlet of reaction tower 1 and the smoke inlet of sack cleaner 5 to spray
Device 3 and activated carbon injection apparatus 4；
The smoke inlet of sack cleaner 5 is located at deduster bottom, and exhanst gas outlet is located at deduster top, with 1# flue gases/
Flue before 8 former smoke inlet of flue gas heat-exchange unit is provided with smoke reflux device 7, and the bottom of sack cleaner 5 fills provided with ash discharge
Put 6；
The smoke inlet phase that the former exhanst gas outlet that 1#GGH8 side walls are provided with is provided with the side wall of wet type extracting tower 9 all the way
Even, a bypass connecting fan 15 is separately set.The top of wet type extracting tower 9 is provided with exhanst gas outlet, at the top of the exhanst gas outlet and 1#GGH8
Neat stress entrance is connected；
The outlet a-road-through piping valve I of 1#GGH8 neat stress（17）It is connected afterwards with 2#GGH11 bottoms original smoke inlet,
Another way 1#GGH8 neat stress outlet is by pipeline through pipeline valve III（18）It is connected with the entrance of air-introduced machine；2#GGH11 is pushed up
Portion's original exhanst gas outlet is connected with SGH12 lower entrances, and SGH12 tops are provided with exhanst gas outlet, and exhanst gas outlet pushes up with SCR reaction towers 13
Portion's entrance is connected；The bottom of SCR reaction towers 13 is provided with exhanst gas outlet, neat stress entrance at the top of 2#GGH11 is connected to, by 2#GGH11
Bottom neat stress outlet passes through valve II（19）Valve connects air-introduced machine 15, and the outlet of air-introduced machine is connected with chimney 16；
1#GGH8 neat stress exports and valve I（17）Between pipeline be provided with a branch road and through valve III（18）, valve
Ⅲ（18）Below with 2#GGH11 bottom valves II（19）The pipeline of neat stress outlet connects and together enters air-introduced machine.Its is main
Effect is that flue gas can be directly from the net cigarettes of 1#GGH8 when 2#GGH11, SGH12 and SCR reactor break down, it is necessary to when stopping transport
Gas outlet connection air-introduced machine 15, then discharged by chimney 16.
A kind of minimum discharge purifier of above-mentioned burning city domestic garbage flue gas, its operating path are as follows：
SNCR systems are sprayed reductant into waste heat boiler flue, complete first step denitration, flue gas is after economizer from upper
Portion enters semidry method reaction tower 1, is reacted with the lime white of atomization, completes first step depickling；Flue gas comes out from semidry method reaction tower 1
Before laggard sack cleaner 5, activated carbon is directly sprayed into flue gas by activated carbon injection apparatus 3 and calcium hydroxide injection apparatus 4
Powder and calcium hydroxide powder, preliminary to adsorb and absorb sour gas, bioxin and the heavy metal ion in flue gas, then flue gas presss from both sides
Band dust enters sack cleaner 5, the further removing sour gas, and remove removing heavy metals and bioxin in sack cleaner 5
Deng pollutant, grey Photon crosses scrapper conveyor and is delivered to ash silo；Filled from the flue gas fraction that sack cleaner 5 comes out into smoke backflow
7 are put, reduces NOx growing amount, another part cools into 1#GGH8, and flue gas takes off again into wet type extracting tower 9 after cooling
Except remnants sour gas, the flue gas after depickling heats up into 2#GGH11, SGH12, and the flue gas after heating reacts into SCR
Device 13, entered 3 layers of catalyst reaction, and further completed denitration and remove bioxin, the flue gas after purification enters 2#
GGH11, flue gas are discharged into air through air-introduced machine 15 after heating by chimney 16.
When 2#GGH11, SGH12 and SCR reactor 13 breaks down, it is necessary to when stopping transport, valve I is closed（17）With valve II
（19）, open valve III（18）, flue gas directly can export connection air-introduced machine 15 from 1#GGH8, then be discharged by chimney 16.
Application Example 1
Using a kind of minimum discharge purifier of burning city domestic garbage flue gas described in embodiment 1 to urban life
Flue gas of refuse burning is handled, and its operating path is as follows：
SNCR systems are sprayed reductant into waste heat boiler flue, complete first step denitration, flue gas is after economizer from upper
Portion enters semidry method reaction tower 1, and neutralization reaction occurs for the sour gas in flue gas and the lime white of atomization, eliminates most
Sour gas；
Before flue gas comes out laggard sack cleaner 5 from the side of semidry method reaction tower 2, by activated carbon injection apparatus 3 and disappear
Lime injection apparatus 4 sprays active carbon powder and calcium hydroxide powder directly into flue gas, the acid in preliminary absorption and absorption flue gas
Property gas, bioxin and heavy metal ion, then flue gas entrainment dust enter sack cleaner 5, in the filter bag of sack cleaner 5
Surface forms filtering layer, and calcium hydroxide further reacts with sour gas, further removes sour gas, and heavy metal and bioxin etc.
Pollutant is separated with activated carbon, and grey Photon crosses scrapper conveyor and is delivered to ash silo；
The flue gas fraction come out from sack cleaner 5 enters smoke reflux device 7, reduces NOx growing amount, another portion
Divide and enter 1#GGH8 coolings, flue gas enters wet type extracting tower 9 after cooling, and alkali lye sprays from top to bottom, and flue gas fully connects with alkali lye
Touch and absorb, further remove the sour gas remained in flue gas, while remove a part of remnants particulate matter；
Flue gas after depickling heats up into 1#GGH8,2#GGH11, SGH12, and the flue gas after heating enters SCR reactors
13, entered 3 layers of catalyst reaction, and further completed denitration and remove bioxin, the flue gas after purification enters 2#GGH11,
Flue gas is discharged into air through air-introduced machine 15 after heating by chimney 16, so as to realize the minimum discharge purified treatment of flue gas.
Minimum discharge purifier by a kind of above-mentioned burning city domestic garbage flue gas is used for domestic waste
After the purified treatment of incineration flue gas, flue dust 5mg/Nm in the flue gas of discharge3, HCl 10mg/Nm3, HF1mg/Nm3, SO210mg/
Nm3, NOx50mg/Nm3, CO10mg/Nm3, Hg0.02mg/Nm3The ng-TEQ/Nm of , bioxin 0.023（Every discharge value above,
To contain 11%O under standard state2Dry flue gas be reference value conversion annual average）, meet European Union 2000/76/EC discharge mark
Standard, wherein flue dust, SO2, NOx, CO, the discharge value such as Hg, bioxin be superior to European Union 2000/76/EC emission limit, realize super
Low emission.
Comparative examples 1
Use " the SNCR+ semidry methods depickling+charcoal absorption bioxin+dry-process deacidification+bag-type dusting of prior art
The flue gas combined treatment process of device ", Pollutant emission concentration meet emission request, flue dust 10mg/Nm in flue gas3, HCl10mg/
Nm3, HF1mg/Nm3, SO250mg/Nm3, NOx150mg/Nm3, Hg0.05mg/Nm3The ng-TEQ/Nm of, bioxin 0.13（More than
Every discharge value, to contain 11%O under standard state2Dry flue gas be reference value conversion annual average）, substantially meet European Union
2000/76/EC discharge standard.
Contrasted by above-mentioned Application Example 1 with comparative examples 1, it can be seen that pass through a kind of above-mentioned city
After the minimum discharge purifier of city's incineration flue gas of household garbage is used for the purified treatment of burning city domestic garbage flue gas, in cigarette
The indexs such as dust content, content of sulfur dioxide, nitrogen oxides, tribute content , content of dioxin have concentration of emission bright than prior art
Aobvious to reduce, smoke content and content of sulfur dioxide are reduced to the 1/2 and 1/5 of prior art, and mercury content is the 2/ of prior art
5 , dioxin contents are only the 1/5 of prior art, have been indicated above flue-gas purification equipment of the present utility model in flue gas
There is obvious advantage in terms of pollutant removing, minimum discharge can be realized.
The above is only the basic explanation under the utility model design, and is made according to the technical solution of the utility model
Any equivalent transformation, belong to the scope of protection of the utility model.
Claims (1)
- A kind of 1. minimum discharge purifier of burning city domestic garbage flue gas, it is characterised in that including smoke reflux device, Prepared by SNCR denitration device, semidry method reaction tower, lime white fills with atomization jetting device, activated carbon and the injection of calcium hydroxide dry powder Put, sack cleaner, wet type extracting tower, flue gas/flue gas heat-exchange unit (1), flue gas/flue gas heat-exchange unit (2), steam/flue gas heat exchange Device SGH, SCR denitration device, air-introduced machine and chimney, it is characterised in that minimum discharge is realized after Alternative combines, is adopted in addition Heat energy is reclaimed with two-stage GGH, reduces energy consumption；Semidry method reaction tower top is provided with gas approach, and side wall is provided with exhanst gas outlet, and bottom is provided with the outlet of flying dust；Half-dried Flue between method reaction tower exhanst gas outlet and sack cleaner smoke inlet is provided with calcium hydroxide injection apparatus and activated carbon sprays Penetrate injection apparatus；Sack cleaner smoke inlet is located at deduster bottom, and exhanst gas outlet is located at deduster top, and sack cleaner bottom is set There is ash exhauster；With flue gas/flue gas heat-exchange unit (1) former smoke inlet before flue on be provided with smoke reflux device, be additionally provided with bypass connect It is connected to air-introduced machine；The former exhanst gas outlet of flue gas/flue gas heat-exchange unit (1) side wall is connected with the smoke inlet on wet type depickling tower side wall, and wet type takes off Exhanst gas outlet is connected with the neat stress entrance at the top of flue gas/flue gas heat-exchange unit (1) at the top of acid tower；It is former with flue gas/flue gas heat-exchange unit (2) bottom after flue gas/flue gas heat-exchange unit (1) neat stress outlet a-road-through piping valve I Smoke inlet is connected, and another bypass is connected through pipeline valve III with the entrance of air-introduced machine；Flue gas/flue gas heat-exchange unit (2) bottom original exhanst gas outlet is connected with SGH lower entrances, and SGH tops are provided with exhanst gas outlet, cigarette Gas outlet is connected with SCR reaction tower top entries；SCR reaction tower bottoms are provided with exhanst gas outlet, flue gas/flue gas heat-exchange unit (2) neat stress entrance are connected to, by flue gas/flue gas Heat exchanger (2) outlet at bottom connects air-introduced machine by valve II, and the outlet of air-introduced machine is connected with flue gas；Flue gas/flue gas heat-exchange unit (1) neat stress outlet valve I between pipeline be provided with bypass, the bypass through valve III below with flue gas/flue gas heat-exchange unit (2) pipeline that bottom valve II exports connects and together enters air-introduced machine.
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| CN201621485602.1U CN206652386U (en) | 2016-12-31 | 2016-12-31 | A kind of minimum discharge purifier of burning city domestic garbage flue gas |
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| CN201621485602.1U CN206652386U (en) | 2016-12-31 | 2016-12-31 | A kind of minimum discharge purifier of burning city domestic garbage flue gas |
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