CN108434924B - System and method for eliminating white smoke from smoke - Google Patents
System and method for eliminating white smoke from smoke Download PDFInfo
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- CN108434924B CN108434924B CN201810580242.0A CN201810580242A CN108434924B CN 108434924 B CN108434924 B CN 108434924B CN 201810580242 A CN201810580242 A CN 201810580242A CN 108434924 B CN108434924 B CN 108434924B
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- 239000000779 smoke Substances 0.000 title claims abstract description 97
- 238000000034 method Methods 0.000 title claims abstract description 29
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 231
- 239000003546 flue gas Substances 0.000 claims abstract description 220
- 238000002156 mixing Methods 0.000 claims abstract description 39
- 230000003009 desulfurizing effect Effects 0.000 claims abstract description 37
- 238000007791 dehumidification Methods 0.000 claims description 7
- 239000012716 precipitator Substances 0.000 claims description 7
- 238000007599 discharging Methods 0.000 claims description 5
- 230000002087 whitening effect Effects 0.000 claims description 4
- 230000008030 elimination Effects 0.000 claims description 2
- 238000003379 elimination reaction Methods 0.000 claims description 2
- 230000007613 environmental effect Effects 0.000 abstract description 4
- 239000000126 substance Substances 0.000 abstract description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 25
- 238000006477 desulfuration reaction Methods 0.000 description 8
- 230000023556 desulfurization Effects 0.000 description 8
- 239000000428 dust Substances 0.000 description 8
- 230000008569 process Effects 0.000 description 8
- 238000009833 condensation Methods 0.000 description 7
- 230000005494 condensation Effects 0.000 description 7
- 238000001816 cooling Methods 0.000 description 7
- 239000003344 environmental pollutant Substances 0.000 description 5
- 239000007789 gas Substances 0.000 description 5
- 231100000719 pollutant Toxicity 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 239000007788 liquid Substances 0.000 description 4
- 239000002918 waste heat Substances 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 239000010881 fly ash Substances 0.000 description 3
- 238000003303 reheating Methods 0.000 description 3
- 239000000498 cooling water Substances 0.000 description 2
- 238000009792 diffusion process Methods 0.000 description 2
- 239000012717 electrostatic precipitator Substances 0.000 description 2
- 238000001704 evaporation Methods 0.000 description 2
- 230000008020 evaporation Effects 0.000 description 2
- -1 flue gas reheating Chemical compound 0.000 description 2
- MXWHMTNPTTVWDM-NXOFHUPFSA-N mitoguazone Chemical compound NC(N)=N\N=C(/C)\C=N\N=C(N)N MXWHMTNPTTVWDM-NXOFHUPFSA-N 0.000 description 2
- 238000005192 partition Methods 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 229920006395 saturated elastomer Polymers 0.000 description 2
- 230000000007 visual effect Effects 0.000 description 2
- 239000000443 aerosol Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 229910003460 diamond Inorganic materials 0.000 description 1
- 239000010432 diamond Substances 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
Classifications
-
- 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
- B01D5/00—Condensation of vapours; Recovering volatile solvents by condensation
- B01D5/0027—Condensation of vapours; Recovering volatile solvents by condensation by direct contact between vapours or gases and the cooling medium
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D5/00—Condensation of vapours; Recovering volatile solvents by condensation
- B01D5/0033—Other features
- B01D5/0036—Multiple-effect condensation; Fractional condensation
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28B—STEAM OR VAPOUR CONDENSERS
- F28B1/00—Condensers in which the steam or vapour is separate from the cooling medium by walls, e.g. surface condenser
- F28B1/06—Condensers in which the steam or vapour is separate from the cooling medium by walls, e.g. surface condenser using air or other gas as the cooling medium
Abstract
The invention relates to the technical fields of chemical industry and environmental protection, in particular to a system and a method for eliminating white smoke from smoke. Specifically, the flue gas white smoke eliminating system comprises a first flue gas condenser, a desulfurizing tower, a second flue gas condenser, a fan, a demister, a flue gas and wind mixing flue and a chimney which are sequentially arranged; the flue gas outlet of the first flue gas condenser is connected with the inlet of the desulfurizing tower, the outlet of the desulfurizing tower is connected with the flue gas inlet of the second flue gas condenser, the flue gas outlet of the second flue gas condenser is connected with the inlet of the demister, the outlet of the demister is connected with the flue gas inlet of the flue gas-air mixing flue, and the outlet of the flue gas-air mixing flue is connected with the chimney; the outlet of the fan is connected with the air inlet of the second flue gas condenser, the air outlet of the second flue gas condenser is connected with the air inlet of the first flue gas condenser, the air outlet of the first flue gas condenser is connected with the air inlet of the flue mixing flue, and the outlet of the flue mixing flue is connected with the chimney.
Description
Technical Field
The invention relates to the technical fields of chemical industry and environmental protection, in particular to a system and a method for eliminating white smoke from smoke.
Background
The wet flue gas desulfurization is the most widely applied desulfurization process in the current market, and has the advantages of high desulfurization efficiency, moderate investment, simple structure and the like. However, the flue gas after desulfurization is directly discharged through a chimney to cause white smoke plume, and the main reasons are as follows:
1) The wet saturated flue gas is rapidly cooled in the diffusion process after being discharged to the atmosphere through a chimney, and liquid drops are condensed and separated out to form white smoke plumes;
2) The flue gas at the outlet of the wet desulfurization system contains a small amount of pollutants such as liquid drops which are not fully collected by a demister, SO 3 aerosol, fly ash and the like, and the liquid drops contain substances such as soluble salt and the like, SO that the substances can be used as condensation nuclei to promote the rapid condensation of gas-phase water in the cooling process and the precipitation of the gas-phase water on the condensation nuclei;
3) In the process of flowing wet saturated flue gas in a flue and a chimney after desulfurization, due to the heat dissipation of the flue and the chimney, partial gas phase water is condensed and is carried by the flue gas to be discharged into the atmosphere, which is also an important cause of causing white smoke plume.
In conclusion, the wet desulfurization white smoke plume is eliminated, not only is the visual pollution solved, but also the deep emission reduction of pollutants can be realized, the diffusion capacity of the smoke is enhanced, and the environmental protection significance is great.
The most traditional method for eliminating the white smoke plume of the flue gas is to heat the desulfurized flue gas by utilizing the waste heat of the flue gas, namely, flue gas reheating, and the typical technology is GGH (Gas GasHeater). However, the technology is gradually abandoned in the Chinese market due to the problems of blockage, leakage and the like existing in early application. With the continuous improvement of environmental protection requirements, partial power plants in economically developed areas adopt a water-borne GGH technical scheme to heat wet saturated flue gas at the outlet of the desulfurizing tower, so that white smoke plume is eliminated to a certain extent, and more applications are obtained. The two technologies for eliminating white smoke plumes by heating wet saturated smoke adopt a method for reducing relative humidity to eliminate white smoke, the water content of the smoke is unchanged, only visual pollution is solved, and pollutants can not be removed cooperatively while eliminating white smoke. In view of this, a flue gas condensation reheating process is proposed, namely, the temperature of wet saturated flue gas is reduced first, partial water in the flue gas is condensed and separated out, and the cooperative removal of pollutants is realized in the process.
And a large amount of cold sources are needed for condensing and separating out part of gas phase water in the flue gas, and usually, the cold sources adopt circulating cooling water. However, some factories cannot provide circulating cooling water, and not only can system investment be increased by arranging a circulating water cooling device independently, but also the water consumption of the cooling device is higher than the collection amount of flue gas condensate water, and the reduction of the water vapor amount discharged into the environment cannot be realized.
Disclosure of Invention
The invention aims at overcoming the defects of the prior art and provides a smoke white smoke eliminating system and method.
Specifically, in one aspect, the invention provides a smoke white smoke eliminating system, which comprises a first smoke condenser, a desulfurizing tower, a second smoke condenser, a fan, a demister, a smoke-wind mixing flue and a chimney which are sequentially arranged;
the flue gas outlet of the first flue gas condenser is connected with the inlet of the desulfurizing tower, the outlet of the desulfurizing tower is connected with the flue gas inlet of the second flue gas condenser, the flue gas outlet of the second flue gas condenser is connected with the inlet of the demister, the outlet of the demister is connected with the flue gas inlet of the flue gas-air mixing flue, and the outlet of the flue gas-air mixing flue is connected with the chimney;
the outlet of the fan is connected with the air inlet of the second flue gas condenser, the air outlet of the second flue gas condenser is connected with the air inlet of the first flue gas condenser, the air outlet of the first flue gas condenser is connected with the air inlet of the flue mixing flue, and the outlet of the flue mixing flue is connected with the chimney.
The flue gas white smoke eliminating system further comprises an electric dust collector, wherein an outlet of the electric dust collector is connected with a flue gas inlet of the first flue gas condenser.
The flue gas white smoke eliminating system further comprises an induced draft fan, wherein an outlet of the electric dust collector is connected with an inlet of the induced draft fan, and an outlet of the induced draft fan is connected with a flue gas inlet of the first flue gas condenser.
The flue gas white smoke eliminating system further comprises an induced draft fan, wherein the flue gas outlet of the first flue gas condenser is connected with the inlet of the induced draft fan, and the outlet of the induced draft fan is connected with the inlet of the desulfurizing tower.
In the flue gas white smoke eliminating system, the first flue gas condenser and the second flue gas condenser are partition wall type heat exchangers.
In another aspect, the invention provides a method for eliminating white smoke from smoke, comprising the following steps:
the flue gas is subjected to primary heat exchange with cold air in a first flue gas condenser, cooled flue gas enters a desulfurizing tower, the flue gas is desulfurized by the desulfurizing tower and then is conveyed to a second flue gas condenser, the flue gas is subjected to secondary heat exchange with the cold air in the second flue gas condenser, and the further cooled flue gas is conveyed to a demister for dehumidification; mixing the dehumidified flue gas with hot air from a second flue gas condenser in a flue gas-air mixing flue, and finally discharging the mixed flue gas through a chimney;
The cold air is conveyed to the second flue gas condenser through the fan to carry out second heat exchange with the flue gas, the warmed cold air enters the first flue gas condenser to absorb heat in the flue gas again to become hot air, the hot air is conveyed to the flue gas mixing flue and is mixed with the flue gas from the demister, and finally the mixed flue gas is discharged through the chimney.
In the method for eliminating white smoke of the smoke, before the first heat exchange is carried out, the smoke is firstly dedusted by an electric dust remover.
According to the smoke white smoke eliminating method, the smoke is conveyed to the first smoke condenser through the induced draft fan.
According to the method for eliminating white smoke in the smoke, before the first heat exchange, the temperature of cold air is 30-70 ℃, and the temperature of the smoke is 100-160 ℃; after the first heat exchange, the temperature of the hot air is 70-130 ℃ and the temperature of the flue gas is 90-120 ℃.
According to the smoke white smoke eliminating method, before the second heat exchange, the temperature of cold air is-10-30 ℃, and the temperature of smoke is 40-70 ℃; after the second heat exchange, the temperature of the cold air is 30-70 ℃ and the temperature of the flue gas is 30-60 ℃.
The technical scheme of the invention has the following beneficial effects:
The system and the method for eliminating white smoke of the flue gas abandon the traditional MGGH which uses water as a heat transfer medium, adopts cold air as a cold source, and converts the heat absorbed by the cold source and the flue gas into a heat source after heat exchange; the heat source is used as a mixing medium to be mixed with the condensed wet saturated flue gas, so as to achieve the purpose of reducing the moisture content of the mixed flue gas. The invention has the advantages of low investment cost, low running cost and good white smoke plume eliminating effect.
Drawings
Figure 1 is a process flow diagram of some embodiments of the invention,
The flue gas condensate water treatment device comprises an electric dust collector 1, an induced draft fan 2, a first flue gas condenser 3, a desulfurizing tower 4, a fan 5, a second flue gas condenser 6, a demister 7, a flue gas and wind mixing flue 8, a chimney 9 and a flue gas condensate water outlet 10.
Detailed Description
The present invention will be described in detail with reference to the following embodiments for a full understanding of the objects, features, and effects of the present invention. The process of the present invention is carried out by methods or apparatus conventional in the art, except as described below. The following terms have the meanings commonly understood by those skilled in the art unless otherwise indicated.
The system and the method for eliminating white smoke of the flue gas abandon the traditional MGGH which uses water as a heat transfer medium, adopts cold air as a cold source, and uses the cold source and wet saturated flue gas at the outlet of the desulfurizing tower to exchange heat and absorb heat, and then uses the cold source and the wet saturated flue gas as a heat transfer medium to enter a waste heat recovery heat exchanger to further recover the waste heat of the flue gas, so that the flue gas is converted into a heat source; the heat source is used as a mixing medium to be mixed with the condensed wet saturated flue gas, so as to achieve the purpose of reducing the moisture content of the mixed flue gas.
Specifically, according to one aspect of the invention, the invention provides a smoke white smoke eliminating system, which comprises a first smoke condenser, a desulfurizing tower, a second smoke condenser, a fan, a demister, a smoke-wind mixing flue and a chimney which are sequentially arranged;
the flue gas outlet of the first flue gas condenser is connected with the inlet of the desulfurizing tower, the outlet of the desulfurizing tower is connected with the flue gas inlet of the second flue gas condenser, the flue gas outlet of the second flue gas condenser is connected with the inlet of the demister, the outlet of the demister is connected with the flue gas inlet of the flue gas-air mixing flue, and the outlet of the flue gas-air mixing flue is connected with the chimney;
the outlet of the fan is connected with the air inlet of the second flue gas condenser, the air outlet of the second flue gas condenser is connected with the air inlet of the first flue gas condenser, the air outlet of the first flue gas condenser is connected with the air inlet of the flue mixing flue, and the outlet of the flue mixing flue is connected with the chimney.
The first flue gas condenser and the second flue gas condenser are partition wall type heat exchangers. The dividing wall type heat exchanger can be a plate type heat exchanger, a sleeve type heat exchanger and a shell-and-tube heat exchanger.
The demister is used for separating liquid drops carried in flue gas output from a flue gas condenser, and can be arranged in a horizontal mode, a herringbone mode, a V-shaped mode and a combined mode (such as diamond and X-shaped). And the generated flue gas condensate water is discharged from a flue gas condensate water outlet.
The desulfurizing tower is of a hollow tower spray type, a tray type and the like. The desulfurizing tower is used for removing SO 2 in the flue gas.
The smoke-wind mixing flue comprises a smoke inlet, an air inlet and a smoke outlet.
Preferably, in some embodiments, the flue gas white smoke abatement system further comprises an electric precipitator, wherein an outlet of the electric precipitator is connected with a flue gas inlet of the first flue gas condenser. The electric dust remover can remove pollutants such as fly ash in the flue gas before the flue gas enters the first flue gas condenser, so that on one hand, the fly ash in the flue gas can be prevented from blocking the condenser, and on the other hand, condensation nuclei can be reduced, and gas phase water can be prevented from being rapidly condensed in the cooling process and separated out on the condensation nuclei.
Most preferably, in some embodiments, the flue gas white smoke eliminating system further comprises a draught fan, wherein an outlet of the electric dust collector is connected with an inlet of the draught fan, and an outlet of the draught fan is connected with a flue gas inlet of the first flue gas condenser. Specifically, as shown in fig. 1, the smoke white smoke eliminating system includes: the flue gas condensate water system comprises an electric dust collector 1, an induced draft fan 2, a first flue gas condenser 3, a desulfurizing tower 4, a fan 5, a second flue gas condenser 6, a demister 7, a flue gas and wind mixing flue 8, a chimney 9 and a flue gas condensate water outlet 10. Wherein electrostatic precipitator 1, draught fan 2, first flue gas condenser 3, desulfurizing tower 4, second flue gas condenser 6, defroster 7, flue 8 and chimney 9 are mixed to the flue gas and are set gradually along the flow direction of flue gas, wherein, electrostatic precipitator 1 is connected with draught fan 2, draught fan 2 is connected with first flue gas condenser 3, first flue gas condenser 3 is connected with desulfurizing tower 4, desulfurizing tower 4 is connected with second flue gas condenser 6, second flue gas condenser 6 is connected with defroster 7, defroster 7 is connected with flue 8 is mixed to the flue gas, flue 8 is mixed to the flue gas and chimney 9 is connected. The fan 5, the second flue gas condenser 6, the first flue gas condenser 3, the flue gas-wind mixing flue 8 and the chimney 9 are sequentially connected along the air circulation direction.
According to the invention, the induced draft fan is arranged to effectively control the conveying speed of the flue gas and ensure the heat exchange effect of the flue gas and cold air, so that the effective operation of the flue gas white smoke eliminating system is further ensured.
Optionally, in some specific embodiments, a flue gas outlet of the first flue gas condenser is connected to an inlet of an induced draft fan, and an outlet of the induced draft fan is connected to an inlet of the desulfurizing tower.
According to another aspect of the present invention, there is provided a method for whitening smoke, comprising the steps of:
The flue gas is subjected to primary heat exchange with cold air in a first flue gas condenser, cooled flue gas enters a desulfurizing tower, the flue gas is desulfurized by the desulfurizing tower and then is conveyed to a second flue gas condenser, the flue gas is subjected to secondary heat exchange with the cold air in the second flue gas condenser, and the cooled flue gas is further conveyed to a demister for dehumidification; mixing the dehumidified flue gas with hot air from a second flue gas condenser in a flue gas-air mixing flue, and finally discharging the mixed flue gas through a chimney;
The cold air is conveyed to the second flue gas condenser through the fan to carry out second heat exchange with the flue gas, the warmed cold air enters the first flue gas condenser to absorb heat in the flue gas again to become hot air, the hot air is conveyed to the flue gas mixing flue and is mixed with the flue gas from the demister, and finally the mixed flue gas is discharged through the chimney.
In the invention, air which can exchange heat with smoke in the first smoke condenser and the second smoke condenser is defined as cold air, and air which is output from the first smoke condenser and is mixed with smoke in a smoke mixing flue is defined as hot air.
According to the invention, three-stage dehumidification is carried out on the flue gas by utilizing air to finally thoroughly eliminate white smoke plume, wherein the first-stage dehumidification is the first flue gas condenser at the inlet of the desulfurizing tower, the cooled flue gas enters the desulfurizing tower, the evaporation water quantity of the desulfurizing tower is greatly reduced, and the gas phase water content of wet saturated flue gas is reduced from the source. The second-stage dehumidification is a second-stage flue gas condenser at the outlet of the desulfurizing tower, and the gas-phase water content of the saturated flue gas is further reduced by cooling and condensing the wet saturated flue gas at the outlet of the desulfurizing tower to obtain water. The third stage of dehumidification is the mixing of hot air in a smoke wind mixing flue and wet saturated smoke after cooling and condensing, and the relative humidity of the mixed smoke is reduced while the temperature of the smoke is increased, so that the white smoke plume is thoroughly eliminated finally. The invention has the advantages of low investment cost, low running cost and good white smoke plume eliminating effect.
Preferably, in some specific embodiments, the flue gas is dedusted by an electric precipitator and then conveyed to the first flue gas condenser for the first heat exchange.
Preferably, in some embodiments, the flue gas is conveyed to the first flue gas condenser by an induced draft fan.
Preferably, in some embodiments, the temperature of the cold air is 30-70 ℃ and the temperature of the flue gas is 100-160 ℃ before the first heat exchange; after the first heat exchange, the temperature of the hot air is 70-130 ℃ and the temperature of the flue gas is 90-120 ℃. Before the second heat exchange, the temperature of the cold air is-10-30 ℃ and the temperature of the flue gas is 40-70 ℃; after the second heat exchange, the temperature of the cold air is 30-70 ℃ and the temperature of the flue gas is 30-60 ℃.
In some specific embodiments, the temperature of the flue gas after heat exchange with the air is controlled by adjusting the wind speeds of the fan and the induced draft fan.
Examples
The invention is further illustrated by means of the following examples, which are not intended to limit the scope of the invention.
Example 1
With the flue gas white smoke elimination system shown in fig. 1, in the first flue gas condenser 3, air and flue gas exchange, wherein the temperature of the flue gas is reduced to 111 ℃ from 140 ℃ at the inlet, the temperature of the air is increased to 92 ℃ at the outlet from 30 ℃ at the inlet, the waste heat is recovered to 4925kW, the moisture content of the flue gas is reduced to 12.58% from 14.06%, and the evaporation water quantity of the desulfurizing tower 4 can be reduced by about 6.4t/h. After the flue gas is treated by the desulfurization tower 4, the temperature of the flue gas is reduced to 50.75 ℃ from 53 ℃, and the flue gas amount is reduced to 463139Nm 3/h from 471091Nm 3/h.
In the second flue gas condenser 6, cold air is used as a cold source, flue gas at the outlet of the desulfurizing tower 4 is cooled from 50.75 ℃ to 49.25 ℃, the temperature is reduced by 1.5 ℃, the condensing water amount of the flue gas is 3.86t/h, the condensing heat release amount of the flue gas is 2904kW, and the amount of flue gas after condensation is 458342Nm 3/h. Wherein the inlet temperature of the cold air is-5 ℃, the outlet temperature is 30 ℃, and the cooling air quantity is 230000Nm 3/h.
For flue gas reheating, the hot air output by the first flue gas condenser 3 is directly mixed with flue gas in the flue gas-air mixing flue 8, the temperature of the mixed flue gas reaches 64.5 ℃, the moisture content of the flue gas is reduced to 7.60%, and no smoke discharging phenomenon exists at a smoke discharging position.
The foregoing describes in detail preferred embodiments of the present invention. It should be understood that numerous modifications and variations can be made in accordance with the concepts of the invention by one of ordinary skill in the art without undue burden. Therefore, all technical solutions which can be obtained by logic analysis, reasoning or limited experiments based on the prior art by the person skilled in the art according to the inventive concept shall be within the scope of protection defined by the claims.
Claims (10)
1. The smoke white smoke eliminating system is characterized by comprising a first smoke condenser, a desulfurizing tower, a second smoke condenser, a fan, a demister, a smoke-wind mixing flue and a chimney which are sequentially arranged;
the flue gas outlet of the first flue gas condenser is connected with the inlet of the desulfurizing tower, the outlet of the desulfurizing tower is connected with the flue gas inlet of the second flue gas condenser, the flue gas outlet of the second flue gas condenser is connected with the inlet of the demister, the outlet of the demister is connected with the flue gas inlet of the flue gas-air mixing flue, and the outlet of the flue gas-air mixing flue is connected with the chimney;
the outlet of the fan is connected with the air inlet of the second flue gas condenser, the air outlet of the second flue gas condenser is connected with the air inlet of the first flue gas condenser, the air outlet of the first flue gas condenser is connected with the air inlet of the flue mixing flue, and the outlet of the flue mixing flue is connected with the chimney.
2. The smoke abatement system of claim 1, further comprising an electrical precipitator, wherein an outlet of the electrical precipitator is connected to a smoke inlet of the first smoke condenser.
3. The flue gas whitening system according to claim 2, further comprising an induced draft fan, wherein the outlet of the electric precipitator is connected to the inlet of the induced draft fan, and the outlet of the induced draft fan is connected to the flue gas inlet of the first flue gas condenser.
4. The flue gas whitening system according to claim 2, further comprising an induced draft fan, wherein the flue gas outlet of the first flue gas condenser is connected to the inlet of the induced draft fan and the outlet of the induced draft fan is connected to the inlet of the desulfurizing tower.
5. The smoke white smoke elimination system of any one of claims 1-4 wherein said first smoke condenser and second smoke condenser are a dividing wall heat exchanger.
6. A method for whitening smoke, which is characterized by comprising the following steps:
the flue gas is subjected to primary heat exchange with cold air in a first flue gas condenser, cooled flue gas enters a desulfurizing tower, the flue gas is desulfurized by the desulfurizing tower and then is conveyed to a second flue gas condenser, the flue gas is subjected to secondary heat exchange with the cold air in the second flue gas condenser, and the further cooled flue gas is conveyed to a demister for dehumidification; mixing the dehumidified flue gas with hot air from a second flue gas condenser in a flue gas-air mixing flue, and finally discharging the mixed flue gas through a chimney;
The cold air is conveyed to the second flue gas condenser through the fan to carry out second heat exchange with the flue gas, the warmed cold air enters the first flue gas condenser to absorb heat in the flue gas again to become hot air, the hot air is conveyed to the flue gas mixing flue and is mixed with the flue gas from the demister, and finally the mixed flue gas is discharged through the chimney.
7. The method for eliminating white smoke from flue gas according to claim 6, wherein the flue gas is dedusted by an electric precipitator before the first heat exchange is performed.
8. The smoke abatement method of claim 6 or 7, wherein the smoke is transported to the first smoke condenser by an induced draft fan.
9. The smoke abatement method according to any one of claims 6-8, wherein the temperature of the cold air is 30-70 ℃ and the temperature of the smoke is 100-160 ℃ before the first heat exchange; after the first heat exchange, the temperature of the hot air is 70-130 ℃ and the temperature of the flue gas is 90-120 ℃.
10. The smoke abatement method according to any one of claims 6-9, wherein the temperature of the cold air is-10-30 ℃ and the temperature of the smoke is 40-70 ℃ before the second heat exchange; after the second heat exchange, the temperature of the cold air is 30-70 ℃ and the temperature of the flue gas is 30-60 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810580242.0A CN108434924B (en) | 2018-06-07 | 2018-06-07 | System and method for eliminating white smoke from smoke |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810580242.0A CN108434924B (en) | 2018-06-07 | 2018-06-07 | System and method for eliminating white smoke from smoke |
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| Publication Number | Publication Date |
|---|---|
| CN108434924A CN108434924A (en) | 2018-08-24 |
| CN108434924B true CN108434924B (en) | 2024-04-19 |
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| CN201810580242.0A Active CN108434924B (en) | 2018-06-07 | 2018-06-07 | System and method for eliminating white smoke from smoke |
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| CN109045953B (en) * | 2018-10-16 | 2023-10-24 | 西安交通大学 | Flue gas cooling, condensing, dehumidifying, decontaminating, reheating and whitening system and method |
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| CN110631040A (en) * | 2019-10-18 | 2019-12-31 | 河北冀研能源科学技术研究院有限公司 | High-efficiency energy-saving smoke condensing and reheating white smoke eliminating system |
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