CN107617319A - A kind of ultra-clean environment protection treating island of coal-fired boiler tail gas - Google Patents
A kind of ultra-clean environment protection treating island of coal-fired boiler tail gas Download PDFInfo
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- CN107617319A CN107617319A CN201711107810.7A CN201711107810A CN107617319A CN 107617319 A CN107617319 A CN 107617319A CN 201711107810 A CN201711107810 A CN 201711107810A CN 107617319 A CN107617319 A CN 107617319A
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- 239000000428 dust Substances 0.000 claims abstract description 58
- 239000003546 flue gas Substances 0.000 claims abstract description 53
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 49
- MXWHMTNPTTVWDM-NXOFHUPFSA-N mitoguazone Chemical compound NC(N)=N\N=C(/C)\C=N\N=C(N)N MXWHMTNPTTVWDM-NXOFHUPFSA-N 0.000 claims abstract description 39
- 239000007789 gas Substances 0.000 claims abstract description 33
- 239000012716 precipitator Substances 0.000 claims abstract description 28
- 238000001816 cooling Methods 0.000 claims abstract description 27
- 238000005345 coagulation Methods 0.000 claims abstract description 26
- 230000015271 coagulation Effects 0.000 claims abstract description 26
- 238000010438 heat treatment Methods 0.000 claims abstract description 22
- 238000010612 desalination reaction Methods 0.000 claims abstract description 18
- 238000010521 absorption reaction Methods 0.000 claims abstract description 14
- 239000000443 aerosol Substances 0.000 claims abstract description 13
- 238000004581 coalescence Methods 0.000 claims abstract description 11
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 claims description 24
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 claims description 15
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- 230000003197 catalytic effect Effects 0.000 claims description 3
- 238000006555 catalytic reaction Methods 0.000 claims description 3
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- 230000000694 effects Effects 0.000 abstract description 7
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- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
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- 241001061906 Caragana Species 0.000 description 1
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- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 1
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Abstract
The invention discloses a kind of ultra-clean environment protection treating island of coal-fired boiler tail gas, connection sets denitrification apparatus before boiler preheater, after be sequentially connected exhaust-heat absorption device, dry collector, desulfurizer, ultrasonic coagulation device, wet electrical dust precipitator, cooling MGGH and heating MGGH be set, form an efficient trapping subparticle PM2.5, aerosol and dehumidifying desalination and take off that white smoke gas treatment is integrated and the system that intercouples.The present invention is reasonable in design, using effect protrudes, particularly ultrasonic coagulation device and cooling MGGH and the MGGH that heats up specific setting, the reunite desalination of growing up and dehumidify of ultrasonic coalescence for realizing the subparticle PM2.5 in flue gas respectively is de- in vain, in the case where reducing environmentally friendly cost, the ultra-clean discharge of flue gas is realized.
Description
Technical field
The invention belongs to environmental protection equipment systems technology field, and in particular to a kind of ultra-clean environment protection treating island of coal-fired boiler tail gas
System.
Background technology
Mist is in the case of aqueous vapor abundance, gentle breeze and atmosphere stabilization, if subaerial air is cooled to certain degree
When, the aqueous vapor in air will condense into fine water drop suspension in aerial, make the On The Deterioration of Visibility Over of ground level, this weather
Phenomenon is referred to as mist.Haze is also referred to as gray haze, refers to the turbid phenomenon formed by particle suspensions such as a large amount of cigarettes, dirt, the core substance of haze
It is the dust granule to be suspended in air, including the particle such as dust, sulfuric acid, nitric acid, organic hydrocarbon compounds, air can be made muddy,
The visual field obscures and causes visibility deterioration.Trigger the various diseases such as skin disease, asthma, cancer, endangered to human body health care belt.Mist
Haze, in general, the difference of mist and haze essentially consist in the size of moisture：Moisture reaches more than 90% mist that cries, moisture
Content is haze less than 80%.It is the mixture of mist and haze, but main component is haze between 80%-90%.In addition, haze and mist are also
There is " different " that some are visible with the naked eye：The thickness of mist only has tens meters to 200 meters, and haze then has 1 km to 3 kms；Mist
Color is milky, Bluish white, and haze is then yellow, orange grey.
The electric energy in China 90% comes from thermal power generation, and thermal power generation and other Industrial Boilers need to use coal-burning boiler, these
Boiler needs the substantial amounts of coal that burns, flue gas caused by coal-fired boiler combustion, it has also become one of main source of haze.Coal-fired pot
Smoke gas treatment has the substantial amounts of process equipment such as out of stock, dedusting and desulfurization after stove, and the effect of these equipment is to realize that flue gas can reach
To environment protection emission requirement, these substantial amounts of environment-protective process processing equipments form the fire coal boiler fume environment protection treating system of complete set
System, under current particularly severe environmental requirement, this smoke gas treatment system is also referred to as ultra-clean environment protection treating island.
The purification of Patent No. 106940025A disclosure of the invention fire coal boiler fume and waste heat recovery processing system and side
Method, operation principle are mainly to pass through denitration reaction device, dust arrester, residual heat absorber, desulfuration absorbing tower, ultrapurification to cool down
Device, residual evaporator realize denitration, dedusting, desulfurization and UTILIZATION OF VESIDUAL HEAT IN, and residual heat absorber is placed on behind dust arrester, can not
The ratio resistance and temperature that enter dry collector are reduced by cooling, the performance of dry collector, dry collector can not be improved
Dust emission easily more than the dust requirement of subordinate's desulfuration absorbing tower so that the slurries of desulfuration absorbing tower receive dust pollution and
Poisoning, desulfurization work can not be normally carried out, simultaneously because desulfuration absorbing tower causes the cigarette of rear class without any dust suppression, one side
Chimney is unable to qualified discharge, on the other hand causes the ultrapurification cooler after desulfuration absorbing tower and after residual evaporator is easily desulfurized
The attachments such as desulfurization slurry aerosol and fine dust in flue gas bond, and reduce its cooling and heating effect.
A kind of smoke processing system of Patent No. 106334428A disclosure of the invention, operation principle is mainly passes through denitration
The realizations such as reaction unit, the first electrostatic precipitator, desulfurizer, the second electrostatic precipitator and reducing agent injection apparatus take off
Nitre, dedusting and desulfurization, because the second electrostatic precipitator set after desulfurizing tower is wet electrical dust precipitator, single wet type electricity removes
Dirt device can not efficiently trap fine dust PM2.5, also be not provided with water-borne flue gas-flue gas heat behind this wet electrical dust precipitator in addition
Exchange MGGH systems, it is impossible to the aerosol in efficiently removing smoke, ultra-clean environment protection emission can not be realized.
Accordingly, it is desirable to provide a kind of ultra-clean environment protection treating island of coal-fired boiler tail gas, realizes the efficient trapping to flue gas,
Focus on the processing to flue gas fine particle PM2.5 and aerosol, reach dehumidifying desalination and take off in vain, ultra-clean processing, realize ultra-clean
Environment protection emission.
The content of the invention
The present invention provides a kind of coal-fired boiler tail gas ultra-clean environment protection treating island regarding to the issue above, it is therefore intended that realizes one
Efficient trapping subparticle PM2.5, aerosol and dehumidifying desalination take off white smoke gas treatment system.
Technical scheme：
A kind of ultra-clean environment protection treating island of coal-fired boiler tail gas, it is characterised in that：Connection sets denitrification apparatus before boiler preheater, after
It is sequentially connected and exhaust-heat absorption device, dry collector, desulfurizer, ultrasonic coagulation device, wet electrical dust precipitator, cooling is set
MGGH and heating MGGH, in the case of giving full play to respective function, the again mutually integrated and coupling of various devices, form one completely
Efficiently trapping subparticle PM2.5, aerosol and dehumidifying desalination take off white smoke gas treatment system.
The denitrification apparatus is that non-selection catalytic denitration SNCR or selective catalysis denitration SCR, denitrification apparatus realize nitrogen oxidation
Thing DS NOx Est amount is less than or equal to 50mg/Nm3。
The exhaust-heat absorption device is low low-level (stack-gas) economizer.
The dry collector includes electric-bag complex dust collector, sack cleaner and electric cleaner, and dry collector is realized
The total discharge capacity of dust is less than or equal to 50mg/Nm3。
The desulfurizer is desulfurizing tower, removes the sulfur dioxide in flue gas, realizes that SO2 emissions are less than or equal to
35mg/Nm3。
The ultrasonic coagulation device includes supersonic generator and the ultrasonic transducer being attached thereto, ultrasonic coagulation
Device carries out ultrasonic coalescence and reunion to the subparticle PM2.5 in flue gas, realizes particle growth.
The wet electrical dust precipitator is carried out to the fine dust PM2.5 of prime ultrasonic wave reunion Caragana seed pests and aerosol etc.
Efficiently trapping, it is respectively to be less than or equal to 50mg/Nm to make its nitrogen oxides NOX, sulfur dioxide SO2 and dust discharge amount3, less than etc.
In 35mg/Nm3, less than or equal to 5mg/Nm3Ultra-clean discharge.
The cooling MGGH and heating MGGH composition heat-exchange devices, are snakelike tube bank.
The cooling MGGH makes cigarette temperature produce LOW TEMPERATURES into water or salt solution etc., is arranged by the discharge outlet for being arranged on its bottom
Go out.
The heating MGGH makes cigarette temperature rise realization be discharged into chimney discharge after taking off in vain.
Beneficial effects of the present invention：
The present invention is reasonable in design, and using effect protrudes, and for smoke pollution processing, connection setting is de- before boiler preheater
Nitre device, after be sequentially connected and set exhaust-heat absorption device, dry collector, desulfurizer, ultrasonic coagulation device, wet type electricity to remove
Dirt device, cooling MGGH and heating MGGH, various devices integrate and intercoupled to form an efficient trapping subparticle
PM2.5, aerosol and dehumidifying desalination take off white smoke gas treatment system, particularly ultrasonic coagulation device and cooling MGGH and heating
MGGH specific setting, the ultrasonic coalescence for realizing the subparticle PM2.5 in flue gas respectively are reunited and grown up and the desalination that dehumidifies takes off
In vain, in the case where reducing environmentally friendly cost, the ultra-clean discharge of flue gas is realized.
Brief description of the drawings
Fig. 1 is schematic structural view of the invention.
Fig. 2 is ultrasonic coagulation apparatus structure schematic diagram.
Fig. 3 is cooling MGGH and heating MGGH structural representations.
Wherein：1 denitrification apparatus, 2 exhaust-heat absorption devices, 3 dry collectors, 4 desulfurizers, 5 ultrasonic coagulations dress
Put, 6 wet electrical dust precipitators, 7 cooling MGGH, 8 heating MGGH, 9 chimneys, 10 ultrasonic coagulation devices, 11 ultrasonic waves occur
Device.
Embodiment
The ultra-clean environment protection treating island of a kind of coal-burning boiler provided by the invention, before boiler preheater connection denitrification apparatus 1 is set,
After be sequentially connected exhaust-heat absorption device 2, dry collector 3, desulfurizer 4, ultrasonic coagulation device 5, wet-esp be set
Device 6, cooling MGGH7 and heating MGGH8, various devices integrate and intercoupled to form an efficient trapping subparticle
PM2.5 and dehumidifying desalination take off white smoke gas treatment system, and denitrification apparatus 1 is non-selection catalytic denitration SNCR or selective catalysis denitration
SCR, denitrification apparatus realize that nitrogen oxides DS NOx Est amount is less than or equal to 50mg/Nm3, then flue gas by exhaust-heat absorption device 2 again
Into dry collector 3, exhaust-heat absorption device 2 is low low-level (stack-gas) economizer, reduces the flue-gas temperature into dry collector 3,
Dry collector 3 includes electric-bag complex dust collector, sack cleaner and electric cleaner, can collect most powder in flue gas
Dirt, including subparticle PM2.5, dry collector realizes that the total discharge capacity of dust is less than or equal to 50mg/Nm3, to meet
The requirement of next technique desulphurization system, the sulfur dioxide that then flue gas passes through in the removing flue gas of desulfurizer 4, desulfurizer 4 are
Desulfurizing tower, realize that SO2 emissions are less than or equal to 35mg/Nm3, flue gas enters back into ultrasonic coagulation device 5, and ultrasonic wave coagulates
Poly- device 5 includes ultrasonic coagulation device 10 and the supersonic generator 11 being attached thereto, using ultrasonic wave to fine particle
Modulating action, fine particle is set to be carried secretly in high intensity sound field by medium and produce vibration, the particulate matter of different-grain diameter is because shaking
Width is different with speed, produces relative motion between each other and causes to collide, particularly subparticle PM2.5 is carried out in wet flue gas
Ultrasonic coalescence and reunion, realize particle growth, are easy to subsequently eliminate, and hereafter flue gas enters back into wet electrical dust precipitator 6, and wet type electricity removes
Dirt device 6 removes dust and aerosol in flue gas etc. by electric field action, realizes nitrogen oxides NOX, sulfur dioxide SO2 and dust
Discharge capacity is respectively to be less than or equal to 50mg/Nm3, less than or equal to 30mg/Nm3, less than or equal to 5mg/Nm3Ultra-clean discharge.It is remaining
Flue gas is again introduced into heat-exchange device, and heat-exchange device is snakelike tube bank, including cooling MGGH and heating MGGH, cools before this
MGGH7 makes cigarette temperature produce LOW TEMPERATURES into water or salt solution etc., is discharged by the discharge outlet for being arranged on its bottom, realizes that desalination removes
It is wet, then be heating MGGH8 make cigarette temperature produce high temperature realize it is de- in vain after be discharged into chimney 9 and discharge, while whole system ultra-clean discharge,
Fine dust can be substantially reduced, desalination dehumidifying is improved and takes off in vain, reduce air " haze ", realize ultra-clean environment protection emission.
The present invention arranges exhaust-heat absorption device 2 before dry collector 3, is lowered into the flue-gas temperature of dry collector,
On the one hand the ratio resistance of flue gas can be reduced, on the other hand can reduce the volume of flue gas, improves gathering dust for dry electric precipitation device
Performance, volume, construction cost and the operation and maintenance cost of dry electric precipitation device are reduced, using electric bag or cloth bag dry collector,
Cigarette temperature drop is low can also to extend life of bag filter, reduce the resistance and energy consumption of Blower for sucking or supplying.
The present invention arranges ultrasonic coagulation device 5 and wet electrical dust precipitator 6 after desulfurizer 4, in wet electrical dust precipitator 6
Heat-exchange system cooling MGGH7 and heating MGGH8 are set afterwards, intercoupled, can be fine dust coalescence group using ultrasonic wave
It is poly- to grow up, facilitate the trapping of wet electrical dust precipitator 6, cooling MGGH7 makes cigarette temperature produce LOW TEMPERATURES into water or salt solution etc., by setting
Put the discharge outlet in its bottom to discharge, realize desalination dehumidifying, heating MGGH8 makes the generation high temperature realization of cigarette temperature be discharged into chimney after taking off in vain
9 discharges, can substantially reduce fine dust, improve desalination dehumidifying and take off in vain, reach the ultra-clean discharges of PM2.5, reduce air " haze ".
The heat-exchange device of the present invention, after flue gas initially enters cooling flue, flue gas fans heat by internal snakelike tube bank,
Flue-gas temperature is down to 20-30 DEG C from 60 DEG C.Flue gas enters back into heating horizontal flue, and flue-gas temperature raises 20-30 from 20-30 DEG C
DEG C, warm water cools through subcooler, comes back to the cooling snakelike tube bank of horizontal flue, and forming an enclosed between two flues follows
Loop system, heat transfer agent is used as by water, leading portion makes flue gas cool-down, is warmly delivered to rear end by water-medium, flue gas is heated up,
Flue gas desalination is carried out by this process to take off in vain, is saved technique water consumption, is reduced the discharge of chimney steam, reduce the corruption to chimney
Erosion, eliminate " plume " visual pollution.
The ultra-clean environment protection treating island of a kind of coal-burning boiler provided by the invention and Patent No. 106940025A patent are " coal-fired
There is difference in boiler flue gas purification and waste heat recovery processing system and method ", as follows：
The present invention arranges exhaust-heat absorption device 2 before dry collector 3, and ultrasonic coagulation is arranged after the desulfurizing tower of desulfurizer 4
Device 5 and wet electrical dust precipitator 6, spray system is not provided with after heat exchanger cooling MGGH7 and heating MGGH8, the present invention is logical
Cross exhaust-heat absorption device 2 reduces the flue-gas temperature into dry collector 3 for low low-level (stack-gas) economizer, on the one hand can reduce cigarette
The ratio resistance of gas, the volume of flue gas on the other hand can be reduced, its dust collection performance can be improved to dry collector 3 and reduces electricity
The volume of deduster, construction cost and operation and maintenance cost, if using electric bag or cloth bag dry collector, flue-gas temperature reduces
The service life of filter bag can also be extended, reduce the resistance and energy consumption for introducing blower fan；Ultrasonic wave after the desulfurizing tower of desulfurizer 4 coagulates
Poly- device 5 and wet electrical dust precipitator 6 intercouple, and ultrasonic coagulation device 5 can be fine dust coalescence using ultrasonic wave
Reunion is grown up because it is single setting wet electrical dust precipitator 6 to fine particle PM2.5 trap effect it is limited, many fine particles without
Method traps, so the trapping of wet electrical dust precipitator 6 for convenience, by the mutual of ultrasonic coagulation device 5 and wet electrical dust precipitator 6
Coupling is set, but carries out heat exchanger cooling MGGH7 and heating MGGH8 processing to the flue gas by rear class, is made in flue gas
Water smoke, various salt steam and aerosol are cooled to the aqueous solution, flow to desulfurization water process by the bottom of heat exchange, realize that desalination removes
It is wet.
The ultra-clean environment protection treating island of a kind of coal-burning boiler provided by the invention and Patent No. 106334428A patent are " a kind of
There is difference in smoke processing system ", as follows：
A kind of Patent No. 106334428A patent " smoke processing system " is due to the second electrostatic precipitation set after desulfurizing tower
Device is wet electrical dust precipitator, and single wet electrical dust precipitator can not efficiently trap fine dust PM2.5, and the present invention is in desulfurization
Arrange ultrasonic coagulation device 5 and wet electrical dust precipitator 6 after the desulfurizing tower of device 4, the ultrasonic coagulation after the desulfurizing tower of desulfurizer 4
Device 5 and wet electrical dust precipitator 6 intercouple, and ultrasonic coagulation device 5 can be fine dust coalescence group using ultrasonic wave
Poly- to grow up, because single setting wet electrical dust precipitator 6 traps to fine particle PM2.5, effect is limited, and many fine particles can not
Trapping, so effective fully trapping to fine particle PM2.5 of wet electrical dust precipitator 6 for convenience, ultrasonic coagulation is filled
Put the setting that intercouples of 5 and wet electrical dust precipitator 6；A kind of other Patent No. 106334428A patent " fume treatment system
System " is not provided with water-borne flue gas-flue gas heat exchange MGGH systems behind wet electrical dust precipitator, and energy waste is serious, and this hair
The bright flue gas to by rear class carries out heat exchanger cooling MGGH7 and heating MGGH8 processing, makes the water smoke in flue gas, various salt
Steam and aerosol are cooled to the aqueous solution, and desulfurization water process is flowed to by the bottom of heat exchange, realize that desalination dehumidifies, extremely save
The energy.
The present invention has the following advantages：
（1）With reference to denitration, dry dust removal, desulfurization, ultrasonic wave, wet-esp, cooling MGGH and the heating how individual device shapes of MGGH
Into One function, complete and close association integrated and coupled system, realizes microparticle PM2.5, the salt gas for influenceing atmospheric haze
The efficient trapping of body, steam and aerosol；
（2）Pass through ultrasonic wave coalescence device so that into wet electrical dust precipitator PM2.5 particles coalescence and agglomerate into larger
Grain, wet electrical dust precipitator arresting efficiency is improved, reduces the discharge of subparticle；
（3）The MGGH heat-exchange devices of cooling are set after wet electrical dust precipitator so that the steam in flue gas is cooled to liquid
Water, the moisture into air is reduced, reduce white cigarette " plume "；
（4）The MGGH heat-exchange devices of cooling are set after wet electrical dust precipitator, the salt constituents in flue gas is cooled to liquid
Salt solution, the salt gas into rear class air is reduced, it is reduced and is reacted with air and sunlight, reduced " plume "；
（5）Corrosion composition after the MGGH that cools in flue gas substantially reduces, and reduces the corrosion of rear class chimney；
（6）Heating MGGH heat-exchange devices are set after the MGGH that cools, flue gas is heated, raises the temperature of gas, equally
Also reduce due to the corrosion of low temperature these flue gases to chimney；
（7）The salinity and moisture in flue gas are reduced, reduces the density of flue gas, improves the draft of chimney, improves flue gas in chimney
Flow velocity, reduce chimney height and save chimney cost, while reduce the resistance of blower fan, save energy consumption.
The present invention is reasonable in design, and using effect protrudes, and connects and sets before boiler preheater for smoke pollution processing
Put denitrification apparatus, after be sequentially connected exhaust-heat absorption device, dry collector, desulfurizer, ultrasonic coagulation device, wet type be set
Electric cleaner, cooling MGGH and the MGGH that heats up, form an efficient trapping subparticle PM2.5 and the desalination that dehumidifies takes off white
Smoke gas treatment system, particularly ultrasonic coagulation device and cooling MGGH and the MGGH that heats up specific setting, realize cigarette respectively
Reunite desalination of growing up and dehumidify of the ultrasonic coalescence of subparticle PM2.5 in gas is de- white, super in the case where reducing environmentally friendly cost
Net processing, saves the energy, increases the service life.
To sum up, the present invention reaches expected purpose.
Claims (10)
- A kind of 1. ultra-clean environment protection treating island of coal-fired boiler tail gas, it is characterised in that：Connection sets denitrification apparatus before boiler preheater, After be sequentially connected exhaust-heat absorption device, dry collector, desulfurizer, ultrasonic coagulation device, wet electrical dust precipitator, drop be set Warm MGGH and heating MGGH, form an efficient trapping subparticle PM2.5, aerosol and dehumidifying desalination and take off white flue gas Administer the integrated and system that intercouples.
- A kind of 2. ultra-clean environment protection treating island of coal-fired boiler tail gas as claimed in claim 1, it is characterised in that：The denitrification apparatus is Non-selection catalytic denitration SNCR or selective catalysis denitration SCR, denitrification apparatus realize that nitrogen oxides DS NOx Est amount is less than or equal to 50mg/Nm3。
- A kind of 3. ultra-clean environment protection treating island of coal-fired boiler tail gas as claimed in claim 1, it is characterised in that：The exhaust-heat absorption dress It is set to low low-level (stack-gas) economizer.
- A kind of 4. ultra-clean environment protection treating island of coal-fired boiler tail gas as claimed in claim 1, it is characterised in that：The dry collector Including electric-bag complex dust collector, sack cleaner and electric cleaner, dry collector realizes that the total discharge capacity of dust is less than or equal to 50mg/Nm3。
- A kind of 5. ultra-clean environment protection treating island of coal-fired boiler tail gas as claimed in claim 1, it is characterised in that：The desulfurizer is Desulfurizing tower, the sulfur dioxide in flue gas is removed, realizes that SO2 emissions are less than or equal to 35mg/Nm3。
- A kind of 6. ultra-clean environment protection treating island of coal-fired boiler tail gas as claimed in claim 1, it is characterised in that：The ultrasonic coagulation Device includes supersonic generator and the ultrasonic transducer being attached thereto, and ultrasonic coagulation device is to the subparticle in flue gas PM2.5 carries out ultrasonic coalescence and reunion, realizes particle growth.
- A kind of 7. ultra-clean environment protection treating island of coal-fired boiler tail gas as claimed in claim 1, it is characterised in that：The wet-esp Device is respectively to be less than or equal to 50mg/Nm to nitrogen oxides NOX, sulfur dioxide SO2 and dust discharge amount3, less than or equal to 35mg/ Nm3, less than or equal to 5mg/Nm3Ultra-clean discharge.
- A kind of 8. ultra-clean environment protection treating island of coal-fired boiler tail gas as claimed in claim 1, it is characterised in that：The cooling MGGH and Heat up MGGH composition heat-exchange devices, is snakelike tube bank, is arranged to closed circulation system using twin flue counterflow configuration.
- A kind of 9. ultra-clean environment protection treating island of coal-fired boiler tail gas as described in claim 1 or 8, it is characterised in that：The cooling MGGH makes cigarette temperature produce LOW TEMPERATURES into water or salt solution etc., is discharged by the discharge outlet for being arranged on its bottom.
- A kind of 10. ultra-clean environment protection treating island of coal-fired boiler tail gas as described in claim 1 or 8, it is characterised in that：The heating MGGH makes the generation high temperature realization of cigarette temperature be discharged into chimney discharge after taking off in vain.
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