CN110354670A - A kind of boiler with tailed flue gas takes off white system and method - Google Patents
A kind of boiler with tailed flue gas takes off white system and method Download PDFInfo
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- CN110354670A CN110354670A CN201910752296.5A CN201910752296A CN110354670A CN 110354670 A CN110354670 A CN 110354670A CN 201910752296 A CN201910752296 A CN 201910752296A CN 110354670 A CN110354670 A CN 110354670A
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- flue gas
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- cooling tower
- flue
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- 239000003546 flue gas Substances 0.000 title claims abstract description 171
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 165
- 238000000034 method Methods 0.000 title claims abstract description 19
- 239000007789 gas Substances 0.000 claims abstract description 77
- 238000001816 cooling Methods 0.000 claims abstract description 58
- 238000002347 injection Methods 0.000 claims abstract description 32
- 239000007924 injection Substances 0.000 claims abstract description 32
- 238000010438 heat treatment Methods 0.000 claims abstract description 30
- 230000003009 desulfurizing effect Effects 0.000 claims abstract description 20
- 239000012716 precipitator Substances 0.000 claims abstract description 16
- 238000009833 condensation Methods 0.000 claims abstract description 11
- 230000005494 condensation Effects 0.000 claims abstract description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 73
- 230000008676 import Effects 0.000 claims description 13
- 239000013618 particulate matter Substances 0.000 claims description 6
- 230000002087 whitening effect Effects 0.000 claims description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 4
- 235000019504 cigarettes Nutrition 0.000 claims description 4
- 229910052742 iron Inorganic materials 0.000 claims description 2
- 238000001556 precipitation Methods 0.000 claims description 2
- 239000006229 carbon black Substances 0.000 description 8
- 239000007921 spray Substances 0.000 description 7
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 3
- 239000000428 dust Substances 0.000 description 3
- 239000000779 smoke Substances 0.000 description 3
- 229910052815 sulfur oxide Inorganic materials 0.000 description 3
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 2
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 2
- 239000005864 Sulphur Substances 0.000 description 2
- 238000009835 boiling Methods 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 239000000356 contaminant Substances 0.000 description 2
- 238000006477 desulfuration reaction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 1
- 239000000443 aerosol Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000023556 desulfurization Effects 0.000 description 1
- TXKMVPPZCYKFAC-UHFFFAOYSA-N disulfur monoxide Inorganic materials O=S=S TXKMVPPZCYKFAC-UHFFFAOYSA-N 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000002737 fuel gas Substances 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000008235 industrial water Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 231100000614 poison Toxicity 0.000 description 1
- 230000007096 poisonous effect Effects 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 239000004071 soot Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- XTQHKBHJIVJGKJ-UHFFFAOYSA-N sulfur monoxide Chemical compound S=O XTQHKBHJIVJGKJ-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D50/00—Combinations of methods or devices for separating particles from gases or vapours
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/002—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by condensation
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/48—Sulfur compounds
- B01D53/50—Sulfur oxides
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/77—Liquid phase processes
- B01D53/78—Liquid phase processes with gas-liquid contact
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/58—Treatment of water, waste water, or sewage by removing specified dissolved compounds
- C02F1/62—Heavy metal compounds
- C02F1/64—Heavy metal compounds of iron or manganese
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J15/00—Arrangements of devices for treating smoke or fumes
- F23J15/06—Arrangements of devices for treating smoke or fumes of coolers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J15/00—Arrangements of devices for treating smoke or fumes
- F23J15/08—Arrangements of devices for treating smoke or fumes of heaters
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/80—Water
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/02—Other waste gases
- B01D2258/0283—Flue gases
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/18—Nature of the water, waste water, sewage or sludge to be treated from the purification of gaseous effluents
-
- 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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/30—Technologies for a more efficient combustion or heat usage
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Biomedical Technology (AREA)
- Health & Medical Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Organic Chemistry (AREA)
- Water Supply & Treatment (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chimneys And Flues (AREA)
- Treating Waste Gases (AREA)
Abstract
The present invention provides a kind of boiler with tailed flue gases to take off white system and method.The system includes air-introduced machine, gas cooler, desulfurizing tower, wet electric precipitator, direct-injection cooling tower, flue gas heating device, water-air heat exchanger, circulating cooling tower and chimney.The flue gas of boiler with tailed discharge tentatively cools down in gas cooler through heat exchange, and heat exchange cools down and makes vapor condensation again in direct-injection cooling tower, and it is white to achieve the purpose that flue gas takes off.The present invention makes the vapor condensation in boiler with tailed flue gas, it is white to achieve the purpose that flue gas takes off by way of cooling down step by step；By the way that heat exchange medium is rationally arranged, heat exchange is gone on smoothly, consumption newly-increased energy too much is not needed；During flue gas takes off white, purified treatment is carried out to flue gas, is conducive to protect environment.
Description
Technical field
The present invention relates to the processing techniques of boiler smoke in carbon black process, and in particular to boiler with tailed flue gas is de-
White system and boiler with tailed flue gas take off whitening method.
Background technique
The tail gas generated in carbon black process contains certain fuel gas (such as CO, H2、CH4、CmHn), calorific value is inclined
It is low, about 650Kcal/Nm3.Carbon black tail gas moisture content is higher, according to the different and aqueous differences of production of carbon black kind, about 30%
~40% (volume ratio) left and right.Carbon black tail gas may be used as boiler oil, generates water after the combustion of hydrogen in carbon black tail gas, causes
The water content of boiler with tailed flue gas (abbreviation flue gas) is larger, about 35% or so (volume ratio)；Flue gas at this time is usually full
And wet flue gas, a large amount of vapor are contained in flue gas, contain more dissolubility salt, SO in vaporX(SOxIndicate the oxidation of sulphur
Object, such as SO2、SO3), gel dust, micronic dust etc. (being all the main component of haze).If flue gas is expelled directly out by chimney, into
Enter in the lower surrounding air of temperature, since the saturated humidity of surrounding air is relatively low, during flue-gas temperature reduces, flue gas
In vapor can condense to form wet plume.
With the increasing of national environmental protection management, the flue gas after boiler combustion is not only needed to carry out desulphurization and denitration, powder
Dirt processing, it is also necessary to carry out plume improvement, i.e., flue gas take off white or flue gas disappear it is white.Flue gas disappear it is white be not only able to remove smoke in nitrogen
Oxide, sulfide, various soot dust granule objects, aerosol, various grain of salt crystals substances, reduce these discharge of poisonous waste and arrive
In atmosphere, environment is polluted；The vapor in flue gas can also be collected, be reused after being handled；Water resource has been saved, has been reduced
The operating cost of enterprise.Flue gas disappears white technique using heat exchanger condensation flue gas is designed after desulfurizing tower at present, makes water in flue gas
Steam condensation, reduces the water content of flue gas.Less to water content in flue gas this technique of discharge flue gas is appropriate, for by carbon black
It for the very high flue gas of water content that tail gas generates, reduces that flue gas is aqueous reaches the white purpose that disappears using heat exchanger condensation, can increase
Operating cost and cost of investment, and the area for building place is larger, to 200000Nm3The boiler with tailed flue gas of/hour
Disappear white, condense flue gas process using heat exchanger, be computed: for the cooling water inflow of heat exchanger up to 4000 ton/hours, operation power consumption can
Up to 800Kwh/h, the area of heat exchanger about 12000m2, the construction area of cooling tower also has 1200m2, while the heat of flue gas condensing
It can also discharge in vain, cause huge waste.
Summary of the invention
The technical issues of for being mentioned in background technique, the present invention provide a kind of boiler with tailed flue gas take off white system and
Method.
A kind of boiler with tailed flue gas provided by the invention takes off white system, including air-introduced machine, gas cooler, desulfurization
Tower, wet electric precipitator, direct-injection cooling tower, flue gas heating device, water-air heat exchanger, circulating cooling tower and chimney, carbon black tail gas pot
The import of the exhanst gas outlet connection air-introduced machine of furnace, the gas inlet of the outlet connection gas cooler of air-introduced machine, gas cooler
Exhanst gas outlet connection desulfurizing tower gas inlet, the exhanst gas outlet of desulfurizing tower connects the gas inlet of wet electric precipitator, wet electricity
The gas inlet of the exhanst gas outlet connection direct-injection cooling tower of deduster, the exhanst gas outlet connection flue gas heating device of direct-injection cooling tower
Gas inlet, the import of the exhanst gas outlet connection chimney of flue gas heating device；The heat transferring medium outlet connection flue gas of gas cooler
The heat transferring medium import of heating device, the heat transferring medium import of the heat transferring medium outlet connection gas cooler of flue gas heating device；Directly
The water inlet of the water outlet connection water-air heat exchanger of cooling tower is sprayed, the water outlet of water-air heat exchanger connects circulating cooling tower
Water inlet, circulating cooling tower water outlet connection direct-injection cooling tower water inlet.
Wherein, air-introduced machine is used to flue gas introducing gas cooler, in gas cooler, flue gas with temperature is lower changes
Thermal medium carries out heat exchange, so that the temperature of flue gas declines.The flue gas of cooling subsequently enters desulfurizing tower, and cigarette is sloughed in desulfurizing tower
SO in gasX.Flue gas subsequently enters wet electric precipitator, and the particulate matter in flue gas is removed in wet electric precipitator.Later, flue gas into
Enter direct-injection cooling tower, the low-temperature atomizing shower water sprayed with direct-injection cooling tower contacts, and flue-gas temperature continues decline so that in flue gas
Vapor condensation.Flue gas subsequently enters flue gas heating device, and flue gas heating device is used to be promoted the temperature of flue gas, and reduces
The temperature of heat transferring medium.Finally, flue gas enters chimney, it is discharged from chimney, the water vapour content in flue gas and particulate matter contain at this time
Amount is all few, not will form wet plume, that is, it is white to have achieved the purpose that flue gas takes off.In gas cooler, the lower heat exchange of temperature
The Absorption of Medium heat of flue gas and heat up；In flue gas heating device, the higher heat transferring medium of temperature releases heat and cools down, and
So that flue gas heats up.In direct-injection cooling tower, simultaneously water is precipitated in flue gas cool-down；The water and atomizing spray water of precipitation enter water-together
Air heat exchanger, water cool down and atmosphere temperature rising；Subsequent water enters circulating cooling tower and further cools down, and condenses and is precipitated in flue gas
Water can be discharged or as industrial water from circulating cooling tower.
It further, further include deironing filter, circulating cooling tower outlet is connect with the import of deironing filter, by recycling
The water of cooling tower water outlet discharge removes the ferrous contaminants in water removal by deironing filter, keeps water cleaner.
A kind of boiler with tailed flue gas provided by the invention takes off whitening method, comprising the following steps:
(1) flue gas is introduced into gas cooler, flue gas and the lower heat transferring medium of temperature is made to carry out heat exchange, flue gas temperature
Degree drops to 120~140 DEG C；
(2) flue gas is introduced into desulfurizing tower, removes the SO in flue gasx(SOxIndicate sulfur oxide, such as SO2、SO3)；
(3) flue gas is introduced into wet electric precipitator, removes particulate matter in flue gas；
(4) flue gas is introduced into direct-injection cooling tower, so that flue gas and atomizing spray water is carried out heat exchange, flue-gas temperature drops to
45~50 DEG C, the vapor condensation in flue gas；
(5) flue gas is introduced into flue gas heating device, flue gas and the higher heat transferring medium of temperature is made to carry out heat exchange, flue gas temperature
Degree rises to 75~80 DEG C；
(6) flue gas is introduced into chimney, flue gas is discharged from chimney.
Further, the heat transferring medium in step (1) and step (5) is water.Because water specific heat is larger, heat absorption emission capacity compared with
By force, so selecting water is heat transferring medium.The boiling point that 0.1MPa is lauched is about 100 DEG C, and the boiling point that 0.5MPa is lauched is about 150 DEG C.
Beneficial effects of the present invention: the present invention had met boiler with tailed flue gas both de- by way of cooling down step by step
The requirement of sulphur technique, and make the vapor major part condensation in flue gas, it is white to achieve the purpose that flue gas takes off；By rationally setting
Thermal medium is replaced, heat exchange is gone on smoothly, does not need consumption newly-increased energy too much；During flue gas takes off white, to flue gas into
Row purified treatment is conducive to protect environment.
Detailed description of the invention
Fig. 1 is the schematic diagram that a kind of boiler with tailed flue gas of the invention takes off white system.
Fig. 2 is the structural schematic diagram of direct-injection cooling tower.
Appended drawing reference is explained: 1. air-introduced machines, 2. gas coolers, 3. desulfurizing towers, 4. wet electric precipitators, and 5. direct-injections are cooling
Tower, 6. flue gas heating devices, 7. water-air heat exchangers, 8. circulating cooling towers, 9. chimneys, 10. deironing filters.
Specific embodiment
The present invention will be further described in the following with reference to the drawings and specific embodiments.
As illustrated in fig. 1 and 2, a kind of boiler with tailed flue gas of the invention takes off white system, for boiler with tailed
The flue gas of generation take off it is white, it include air-introduced machine 1, gas cooler 2, desulfurizing tower 3, wet electric precipitator 4, direct-injection cooling tower 5,
Flue gas heating device 6, water-air heat exchanger 7, circulating cooling tower 8, chimney 9 and deironing filter 10.
The import of air-introduced machine 1 and the exhanst gas outlet of boiler with tailed are connected by pipeline, the outlet of air-introduced machine 1 and flue gas
The gas inlet of cooler 2 is connected by pipeline.Air-introduced machine 1 is used for drawing smoke, pressurizes and conveys flue gas to gas cooler 2
In.
Gas cooler 2 and flue gas heating device 6 are heat exchanger, include exhaust gases passes and heat exchanging medium passage.Cigarette
The gas inlet of Gas Cooler 2 is connect with the outlet of air-introduced machine 1 by pipeline, the exhanst gas outlet and desulfurizing tower 3 of gas cooler 2
Gas inlet pass through pipeline connect.The heat transferring medium outlet of gas cooler 2 and the heat transferring medium import of flue gas heating device 6 are logical
Piping connection, the heat transferring medium import of gas cooler 2 is exported with the heat transferring medium of flue gas heating device 6 to be connect by pipeline.
Gas cooler 2 is used for cooled flue gas, and flue gas and the lower heat transferring medium of temperature carry out heat exchange, makes flue gas cool-down and Jie that exchanges heat
Matter heating.
The gas inlet of desulfurizing tower 3 is connect with the exhanst gas outlet of gas cooler 2 by pipeline, and the flue gas of desulfurizing tower 3 goes out
Mouth is connect with the gas inlet of wet electric precipitator 4.Desulfurizing tower 3 is wet desulfuration tower, for sloughing the SO in flue gasx, make flue gas
In SOxContent reaches discharge standard.
Wet electric precipitator 4 is mounted on 3 top of desulfurizing tower, and gas inlet is connect with the exhanst gas outlet of desulfurizing tower 3, flue gas
Outlet is connect with the gas inlet of direct-injection cooling tower 5 by pipeline.Wet electric precipitator 4 is used to remove the particulate matter in flue gas, makes
Particle content reaches 5mg/Nm in flue gas3Discharge standard below.
Direct-injection cooling tower 5 be also known as water cooling tower, inside comprising set on top water collection device and with direct-injection cooling tower 5
The nozzle of water inlet connection.The gas inlet of direct-injection cooling tower 5 is connect with the exhanst gas outlet of wet electric precipitator 4 by pipeline, directly
The exhanst gas outlet of spray cooling tower 5 is connect with the gas inlet of flue gas heating device 6 by pipeline.The atomizing spray of direct-injection cooling tower 5
Water inlet is connect with the water outlet of circulating cooling tower 8 by pipeline, the water outlet of direct-injection cooling tower 5 (including atomizing spray water and
Condensed water) it is connect with the water inlet of water-air heat exchanger 7 by pipeline.In direct-injection cooling tower 5, water from nozzle spray, with from
The flue gas that gas inlet enters carries out heat exchange, so that flue-gas temperature drops to dew point hereinafter, so that relatively large in flue gas
Water vapor condensation is precipitated.The flue gas of moisture is precipitated after water collection device, the water vapour content in flue gas substantially reduces, when discharge not
It will form wet plume.
The gas inlet of flue gas heating device 6 is connect with the exhanst gas outlet of direct-injection cooling tower 5 by pipeline, flue gas heating device 6
Exhanst gas outlet connect with chimney 9 by pipeline.In flue gas heating device 6, flue gas and the higher heat transferring medium of temperature carry out heat
Exchange, makes flue gas heat up and heat transferring medium cools down.Heat transferring medium used in gas cooler 2 and flue gas heating device 6 is followed
Ring constantly carries out heat exchange with flue gas, to save energy.Flue gas after heating enters chimney 9, is discharged at the top of chimney 9.
The water inlet of water-air heat exchanger 7 is connect with the water outlet of direct-injection cooling tower 5 by pipeline, water-air heat exchanger
7 water outlet is connect with the water inlet of circulating cooling tower 8 by pipeline.In direct-injection cooling tower 5 with the water of flue gas heat exchange with
And the water being precipitated from flue gas enters water-air heat exchanger 7, carries out heat exchange with air, reduces the temperature of water and Air Temperature
Degree increases.Water heat release, temperature drop 5-10 DEG C；Air heat absorption, heats up 5-10 DEG C or so, the air of heating can be used for other equipment
Preheating.For example, the air that can be will heat up is used as the preheated air of boiler with tailed, the partial heat energy is recycled,
Improve the efficiency (being computed, boiler efficiency can be improved about in 0.5%-1% or so) of boiler.
The water inlet of circulating cooling tower 8 is connect with the water outlet of water-air heat exchanger 7 by pipeline, circulating cooling tower 8
Water outlet is connect with the water inlet of the water inlet of direct-injection cooling tower 5, deironing filter 10 by pipeline respectively.In circulating cooling tower
In 8, water is further cooled, water source of the water a part after cooling as direct-injection cooling tower 5, and another part is flowed into except iron filters
Device 10.In deironing filter 10, the ferrous contaminants in water are filtered, and guarantee that water quality reaches the requirement using water, to send
It is reused to each with water spot.
White system is taken off according to above-mentioned boiler with tailed flue gas, proposes that a kind of boiler with tailed flue gas takes off whitening method,
Method includes the following steps:
(1) flue-gas temperature that boiler with tailed generates is cold by the introducing flue gas of air-introduced machine 1 by flue gas at 180 DEG C or so
But in device 2, the heat transferring medium of flue gas and 80 DEG C or so is made to carry out heat exchange, flue-gas temperature drops to 120 DEG C or so, heat transferring medium
Temperature rises to 120 DEG C or so；
(2) flue gas is introduced into desulfurizing tower 3, removes the SO in flue gasx, make the SO in flue gasxContent reaches discharge standard；
(3) flue gas is introduced into wet electric precipitator 4, removes particulate matter in flue gas, reaches particle content in flue gas
5mg/Nm3Discharge standard below；
(4) flue gas is introduced into direct-injection cooling tower 5, the spray water of flue gas and 30 DEG C or so is made to carry out heat exchange, flue gas temperature
Degree drops to 50 DEG C or so, and most of vapor condensation in flue gas, the temperature of water rises to 50 DEG C or so；
(5) flue gas is introduced into flue gas heating device 6, the heat exchange medium of flue gas and 120 DEG C or so is made to carry out heat exchange, flue gas
Temperature rises to 80 DEG C or so, and heat exchange medium temperature drops to 80 DEG C or so；
(6) flue gas is introduced into chimney 9, flue gas is discharged from chimney 9.
Claims (4)
1. a kind of boiler with tailed flue gas takes off white system, it is characterised in that: including air-introduced machine, gas cooler, desulfurizing tower, wet
Electric precipitator, direct-injection cooling tower, flue gas heating device, water-air heat exchanger, circulating cooling tower and chimney, boiler with tailed
Exhanst gas outlet connects the import of air-introduced machine, the gas inlet of the outlet connection gas cooler of air-introduced machine, the cigarette of gas cooler
The gas inlet of gas outlet connection desulfurizing tower, the exhanst gas outlet of desulfurizing tower connect the gas inlet of wet electric precipitator, wet electric precipitation
The gas inlet of the exhanst gas outlet connection direct-injection cooling tower of device, the flue gas of the exhanst gas outlet connection flue gas heating device of direct-injection cooling tower
Import, the import of the exhanst gas outlet connection chimney of flue gas heating device；The heat transferring medium outlet connection flue gas heating of gas cooler
The heat transferring medium import of device, the heat transferring medium import of the heat transferring medium outlet connection gas cooler of flue gas heating device；Direct-injection is cold
But tower water outlet connection water-air heat exchanger water inlet, water-air heat exchanger water outlet connection circulating cooling tower into
The mouth of a river, the water inlet of the water outlet connection direct-injection cooling tower of circulating cooling tower.
2. boiler with tailed flue gas according to claim 1 takes off white system, it is characterised in that: further include except iron filters
Device, the water outlet of the water inlet connection circulating cooling tower of deironing filter.
3. a kind of boiler with tailed flue gas takes off whitening method, comprising the following steps:
(1) flue gas is introduced into gas cooler, flue gas and the lower heat transferring medium of temperature is made to carry out heat exchange, under flue-gas temperature
It is down to 120~140 DEG C；
(2) flue gas is introduced into desulfurizing tower, removes the SO in flue gasx；
(3) flue gas is introduced into wet electric precipitator, removes particulate matter in flue gas；
(4) flue gas is introduced into direct-injection cooling tower, so that flue gas and water is carried out heat exchange, flue-gas temperature drops to 45~50 DEG C, cigarette
Vapor condensation in gas；
(5) flue gas is introduced into flue gas heating device, flue gas and the higher heat transferring medium of temperature is made to carry out heat exchange, in flue-gas temperature
Rise to 75~85 DEG C；
(6) treated flue gas is introduced into chimney, flue gas is discharged from chimney.
4. boiler with tailed flue gas according to claim 3 takes off whitening method, it is characterised in that: step (1) and step (5)
In heat transferring medium be water.
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