CN107930309B - Wet smoke plume eliminating system - Google Patents
Wet smoke plume eliminating system Download PDFInfo
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- CN107930309B CN107930309B CN201711482429.9A CN201711482429A CN107930309B CN 107930309 B CN107930309 B CN 107930309B CN 201711482429 A CN201711482429 A CN 201711482429A CN 107930309 B CN107930309 B CN 107930309B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D47/00—Separating dispersed particles from gases, air or vapours by liquid as separating agent
- B01D47/06—Spray cleaning
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- 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
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- 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
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- 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
- B01D53/14—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 absorption
- B01D53/1456—Removing acid components
- B01D53/1481—Removing sulfur dioxide or sulfur trioxide
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- 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
- B01D53/14—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 absorption
- B01D53/18—Absorbing units; Liquid distributors therefor
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- 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
- B01D53/14—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 absorption
- B01D53/18—Absorbing units; Liquid distributors therefor
- B01D53/185—Liquid distributors
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- 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
- B01D53/26—Drying gases or vapours
- B01D53/265—Drying gases or vapours by refrigeration (condensation)
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- 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
Abstract
The invention relates to a wet smoke plume eliminating system which comprises a first cooling subsystem, a second cooling subsystem and a heater, wherein the first cooling subsystem, the second cooling subsystem and the heater are sequentially arranged between a flue gas outlet of a desulfurizing tower and a chimney; the first cooling subsystem comprises a first circulating water loop, a spraying device and a circulating water tank are arranged in the first circulating water loop, and the second cooling subsystem comprises a fluoroplastic heat exchanger communicated with the spraying device; the circulating water tank is communicated with the first cooling subsystem and the second cooling subsystem and is used for collecting condensed water and spray water and providing circulating water which circulates along the first circulating water loop and enters the spray device; the water storage tank is communicated with the overflow port of the circulating water tank. The wet smoke plume eliminating system can effectively extract water from smoke, completely eliminate the phenomenon of wet smoke plume, purify the environment and improve the water use efficiency of a power plant.
Description
Technical Field
The invention relates to the technical field of chimney treatment, water saving and energy saving, in particular to a wet smoke plume eliminating system.
Background
As saturated wet flue gas is discharged from the chimney outlet of the coal-fired power plant and is directly discharged into the atmosphere through the chimney, the phenomenon of wet flue gas plume 'large white smoke' can occur, the acceptance of surrounding residents on near-zero discharge of the power plant can be greatly reduced, and related requirements are provided by part of residents.
Therefore, the treatment of the wet smoke plume of the coal-fired power plant is not only the requirement of environment-friendly work of the coal-fired power plant but also the problem to be solved.
At present, three wet plume treatment methods are summarized based on the exploration and research of the wet plume formation mechanism: condensing method, condensing reheating method, heating method.
The technical scheme of the device for cooperatively removing pollutants in flue gas by deep waste heat recovery mainly comprises a primary waste heat recovery system, an electrostatic dust removal mercury removal system, a deep waste heat recovery cooperative multi-removal system, a high-efficiency desulfurization dust removal system, a flue gas reheating system and a chimney. The technical scheme is that the heating method is adopted, and mainly the deep waste heat recovery and the multi-desorption system arranged in front of the desulfurization system are used for absorbing heat from raw flue gas and releasing heat to clean flue gas in front of a chimney, so that the purpose of reheating the flue gas is achieved, and the temperature of the exhaust gas at the inlet of the chimney is increased to be above 80 ℃. Although the system can reduce or eliminate the phenomenon of 'large white smoke' of wet smoke plumes of a chimney, the system does not acquire water from the smoke, a large amount of water carried in the smoke is discharged to the atmosphere through the chimney, the water consumption of a power plant is not reduced, and the phenomenon of large white smoke of the chimney cannot be completely eliminated when the temperature in winter is low.
The patent number is 201610583258.8, the patent name is a flue gas condensation water lifting system, and its technical scheme mainly includes flue gas condensation end system, flue gas cold source end system, and flue gas condensation end system includes desulfurization absorption tower, flue gas purification condensing tower and condensation water storage box, and cold source end system mainly comprises the heat exchange tower. The technical scheme is that the condensing method is adopted, and wet flue gas is mainly cooled by spraying spray water, so that the wet flue gas is dehydrated, the spray water enters a spray tower again for spraying and cooling circulation after being cooled by a heat exchange tower, and the purpose of condensing and extracting the flue gas is achieved. The system can reduce the wet smoke plume phenomenon of the chimney, but can not completely eliminate the wet smoke plume phenomenon of the chimney.
The technical scheme of the deep purification smoke plume removal system for the coal-fired flue gas is that the deep purification smoke plume removal system for the coal-fired flue gas mainly comprises a cooling phase-change condenser, a flue demister and a warmer in a flue, and flue gas at an outlet of a desulfurizing tower is discharged through a chimney after being treated by the cooling phase-change condenser, the flue demister and the warmer in sequence. The system adopts the principle of a condensation reheating method, and adopts a method of small temperature reduction and small temperature rise after dehydration, thereby achieving the purpose of reducing or completely eliminating the wet smoke plume in part of time. The partition wall type cooling phase-change condenser is adopted, so that the heat transfer coefficient and the heat transfer temperature and pressure are small, the temperature drop is low, the condensed water of the system is less, and in winter, the wet flue gas is required to be condensed to a lower temperature and then reheated, so that the wet flue gas plume can be completely eliminated.
Therefore, how to effectively extract water from the flue gas and completely eliminate the phenomenon of wet smoke plume is a technical problem to be solved by the person skilled in the art.
Disclosure of Invention
The invention aims to provide a wet smoke plume eliminating system which can effectively extract water from smoke, completely eliminate the phenomenon of wet smoke plume, purify the environment and improve the heat efficiency and water efficiency of a power plant.
In order to solve the technical problems, the invention provides a wet smoke plume eliminating system, which comprises a first cooling subsystem, a second cooling subsystem and a heater, wherein the first cooling subsystem, the second cooling subsystem and the heater are sequentially arranged between a flue gas outlet of a desulfurizing tower and a chimney; the first cooling subsystem comprises a first circulating water loop, a spraying device and a circulating water tank are arranged in the first circulating water loop, and the second cooling subsystem comprises a fluoroplastic heat exchanger communicated with the spraying device; the circulating water tank is communicated with the first cooling subsystem and the second cooling subsystem and is used for collecting condensed water and spray water and providing circulating water which circulates along the first circulating water loop and enters the spray device; the water storage tank is communicated with the overflow port of the circulating water tank.
The wet smoke plume eliminating system provided by the invention is arranged between the flue gas outlet of the desulfurizing tower and the chimney, the flue gas is cooled by the first cooling subsystem and the second cooling subsystem, and fine particles, bivalent mercury and SO in the flue gas can be removed 3 And the aerosol, soluble salt and other pollutants, and a sufficient amount of water condensed from the flue gas is stored in a water storage tank to be supplied to a wet desulfurization system for water supplementing and the like. After the first cooling subsystem and the second cooling subsystem are cooled for two times, the temperature and the moisture content of the flue gas are reduced, and the flue gas is heated by a heater to raise the temperature, so thatThe smoke humidity reaches a certain degree of unsaturated state, and the phenomenon of eliminating the dehumidification smoke plume can be realized.
The first cooling subsystem cools the flue gas by the heat exchange mode of direct contact of the spray water and the flue gas, and the heat exchange mode of direct contact can avoid the problems of low heat exchange coefficient, low temperature rise of refrigerant medium, corrosion and abrasion of the heat exchange equipment (corrosive substances and particles are contained in the flue gas), and the heat exchange coefficient of direct contact can reach as high as 10 4 ～10 5 W/(m 3 * DEG C), and the temperature of the refrigerant medium can be increased to be close to the inlet temperature of the flue gas, namely, the heat exchange efficiency is effectively improved, the temperature of the flue gas is greatly reduced, and the condensation effect is good.
Meanwhile, when the flue gas passes through the first cooling subsystem, spray water is atomized by the nozzles of the spraying device, so that the concentration of fine liquid drops in a space area is increased, namely, the contact probability of the fine liquid drops and fine particles is increased, and most of fine particles such as dust, fog drops and the like in the flue gas are enabled to be larger in condensation and spray water flushing along with condensation of water vapor in the flue gas, and are captured and removed by the spray water. And under the action of a large amount of spray water and flue gas condensed water, part of bivalent mercury is dissolved in water and removed. SO (SO) 3 Contaminants such as aerosols and soluble salts are removed by a large amount of spray water.
The fluoroplastic heat exchanger consists of a plurality of flexible pipes, the pipe diameters are smaller and densely distributed, fog drops are mixed in the flue gas sprayed by the spraying device, and when the flue gas passes through the fluoroplastic heat exchanger, the densely distributed flexible pipes slightly shake, so that the fog drops and the rest small particles in the flue gas are adhered and removed by the pipe wall surface under the actions of interception, thermophoresis and the like of the flexible pipes. More than 90% of the particles can be removed by the two-stage cooling system. Meanwhile, most large-particle dust is removed when passing through the spraying device, so that the abrasion of smoke dust to the fluoroplastic heat exchanger can be reduced, and the safe and stable operation of the system is ensured. And the fluoroplastic heat exchanger has good corrosion resistance and long service life. Namely, in the wet smoke plume eliminating system provided by the invention, the fluoroplastic heat exchanger can simultaneously play roles of demisting, cooling and dedustingI.e. further reducing the temperature of the flue gas, and removing fog drops and bivalent mercury and SO remained in the flue gas 3 Aerosol, soluble salts, and the like.
In addition, it is known from the mechanism of formation of wet plumes that the wet plumes are more likely to be formed when the ambient temperature is lower than when the ambient temperature is higher. Therefore, when the ambient temperature is lower, the heat exchange function of the fluoroplastic heat exchanger is started, and the temperature of the flue gas is further reduced while the demisting and dedusting effects are achieved, and the water in the flue gas is condensed and separated out, so that the phenomenon of wet smoke plume can be effectively eliminated after the flue gas is heated by the heater; when the ambient temperature is higher, the flue gas condensation width reduction required by completely eliminating the wet flue gas plume is smaller, and the heating temperature rise is smaller, at the moment, the heat exchange function of the fluoroplastic heat exchanger can be not required to be started, namely, the fluoroplastic heat exchanger only plays roles of demisting and dedusting. That is, the fluoroplastic heat exchanger can defog and remove dust to the flue gas passing through the spraying device, and simultaneously can selectively start and stop the heat exchange function according to the ambient temperature, so that the applicability is good.
In summary, the spraying device of the first cooling subsystem can greatly reduce the temperature of the flue gas, SO that the moisture in the flue gas is condensed and flows into the circulating water tank along with the spray water, when the water quantity in the circulating water tank exceeds the water quantity required by the first circulating water loop, the redundant water enters the water storage tank from the overflow port of the circulating water tank, wherein the redundant water mainly comes from the water condensed by the flue gas, namely, the moisture in the flue gas is effectively extracted, the temperature and the moisture of the flue gas passing through the first cooling subsystem and the second cooling subsystem are reduced, the moisture plume phenomenon can be completely eliminated after the flue gas is heated by the heater, and meanwhile, most of dust, bivalent mercury and SO (sulfur dioxide) 3 The pollutants such as aerosol, soluble salt and the like are collected and captured by condensed water and spray water after passing through the first cooling subsystem and the second cooling subsystem so as to be removed from the flue gas, thereby achieving the purpose of purifying the flue gas.
Optionally, the second cooling subsystem further comprises a heater for heating the air supplied by the boiler, and the cold source water of the fluoroplastic heat exchanger and the heat source water of the heater form a second circulating water loop capable of being opened and closed.
Optionally, the boiler air supply device further comprises a bypass flue, wherein the bypass flue and the heater are connected in parallel in the boiler air supply flue, and the bypass flue is provided with a shutter plate capable of being opened and closed.
Optionally, variable-frequency water pumps and electric flow regulating valves are arranged in the first circulating water loop and the second circulating water loop.
Optionally, the flue gas desulfurization device further comprises a cooler shell arranged between the flue gas outlet of the desulfurization tower and the heater, the fluoroplastic heat exchanger is arranged above the spraying device and is positioned in the cooler shell, and the circulating water tank is communicated with a water outlet of the cooler shell.
Optionally, the spray nozzle of the spraying device is a glass fiber reinforced plastic spray nozzle, and the inner wall of the cooler shell and the inner wall of the first circulating water loop are coated with an anti-corrosion coating.
Optionally, a turbulence device is further arranged in the cooler housing, and the turbulence device is located below the spraying device.
Optionally, the first cooling subsystem further comprises an air cooling tower, a fin heat exchange tube and a fan are arranged in the air cooling tower, and the spraying device, the fin heat exchange tube and the circulating water tank form the first circulating water loop.
Optionally, a dosing device for adjusting the pH value of the circulating water is arranged in the circulating water tank.
Optionally, the heater is a hot overgrate air heater, a flue gas heat exchanger or a steam heater.
Drawings
FIG. 1 is a schematic diagram of a wet plume abatement system according to an embodiment of the present invention;
fig. 2 is a schematic diagram of wet plume abatement.
In fig. 1-2, the reference numerals are as follows:
1-a smoke inlet; 2-a smoke outlet 2; 31-spraying devices, 32-circulating water tanks, 321-water inlets, 322-water outlets, 323-overflow ports, 33-first circulating water loops, 34-dosing devices, 35-air cooling towers, 351-fin heat exchange tubes and 352-fans; 41-fluoroplastic heat exchanger, 42-air heater, 43-second circulating water loop, 431-water supplementing inlet, 44-variable-frequency water pump, 45-electric flow regulating valve and 46-flowmeter; 5-a heater; 6-a water storage tank; 7-a cooler housing; 8-turbulence means; 9-by-pass flue; 91-a shutter plate.
Detailed Description
In order to make the technical solution of the present invention better understood by those skilled in the art, the present invention will be further described in detail with reference to the accompanying drawings and specific embodiments.
Referring to fig. 1 and 2, fig. 1 is a schematic structural diagram of a wet smoke plume abatement system according to an embodiment of the present invention; fig. 2 is a schematic diagram of wet plume abatement.
As shown in fig. 1, an embodiment of the present invention provides a wet plume abatement system, which includes a first cooling subsystem, a second cooling subsystem, and a heater 5 sequentially disposed between a flue gas outlet of a desulfurizing tower and a chimney. The first cooling subsystem comprises a first circulating water loop 33, a spraying device 31 and a circulating water tank 32 are arranged in the first circulating water loop 33, and the second cooling subsystem comprises a fluoroplastic heat exchanger 41 communicated with the spraying device 31. The circulating water tank 32 communicates with the first cooling subsystem and the second cooling subsystem for collecting condensed water and shower water and providing circulating water that circulates along the first circulating water circuit 33 into the shower device 31; also included is a water storage tank 6, the water storage tank 6 being in communication with an overflow 323 of the circulation tank 32.
As shown in figure 1, the flue gas discharged from the flue gas outlet of the desulfurizing tower enters the wet flue gas plume eliminating system through the flue gas inlet 1, and the dust, bivalent mercury and SO in the flue gas can be removed by cooling through the first cooling subsystem and the second cooling subsystem 3 Aerosol and soluble salts, and a sufficient amount of water condensed from the flue gas is stored in the water storage tank 6 for use in wet desulfurization system make-up, etc. The flue gas after twice cooling and condensing is heated by the heater 5, then passes through the smoke outlet 2 to the chimney and finally is discharged into the atmosphere, so that the phenomenon of wet smoke plume can be effectively eliminated.
As shown in FIG. 2, the curve represents a wet saturation curve, the point A is the temperature of the flue gas at the wet desulfurization outlet, the point B is the temperature reached by the flue gas through a direct heating method, the point D is the temperature of the flue gas after being cooled by the first cooling subsystem and the second cooling subsystem, the point E is the temperature of the flue gas after being heated by the point D, and the point C is the local environment temperature.
The first cooling subsystem comprises a spraying device 31, namely the first cooling subsystem cools and cools the flue gas by a heat exchange mode of directly contacting the spray water with the flue gas, the heat exchange mode of the direct contact can avoid the problems of low heat exchange coefficient of heat exchange equipment, small temperature rise of coolant medium water, corrosion and abrasion of the heat exchange equipment (corrosive substances and particles are contained in the flue gas), and the heat exchange coefficient of the direct contact can reach up to 10 4 ～10 5 W/(m 3 * DEG C), and the temperature of the refrigerant medium can be increased to be close to the inlet temperature of the flue gas, namely, the heat exchange efficiency is effectively improved, the temperature of the flue gas is greatly reduced, the flow rate of the refrigerant medium is small, and the condensation effect is good. Meanwhile, when the flue gas passes through the first cooling subsystem, the spray water is atomized by the nozzles of the spray device 31, so that the concentration of fine liquid drops in the space area is increased, namely, the contact probability of the fine liquid drops and dust is increased, and most of fine particles such as fine particles, fog drops and the like in the flue gas are enabled to be larger in condensation and spray water flushing along with condensation of water vapor in the flue gas, and are captured and removed by the spray water. And under the action of a large amount of spray water and flue gas condensed water, part of bivalent mercury is dissolved in water and removed. SO (SO) 3 Contaminants such as aerosols and soluble salts are removed by a large amount of spray water.
The second cooling subsystem comprises a fluoroplastic heat exchanger 41 arranged in communication with the spraying device 31, the fluoroplastic heat exchanger 41 being composed of a plurality of flexible tubesThe composition is small in pipe diameter and densely distributed, and when the flue gas passes through the fluoroplastic heat exchanger 41, the densely distributed flexible pipes slightly shake, so that residual small particles in the flue gas are adhered and removed by the water film on the pipe wall surface under the actions of interception, thermophoresis and the like of the flexible pipes. More than 90% of the particles can be removed by the two-stage cooling system. Meanwhile, most of large-particle dust is removed when passing through the spraying device 31, so that abrasion of the flue gas to the fluoroplastic heat exchanger 41 can be reduced, and safe and stable operation of the system is ensured. And the fluoroplastic heat exchanger 41 has good corrosion resistance and long service life. In the wet smoke plume eliminating system provided by the invention, the fluoroplastic heat exchanger 41 can simultaneously perform the functions of demisting, cooling and dedusting, namely, the temperature of the smoke is further reduced, and fog drops, bivalent mercury and SO remained in the smoke are removed 3 Aerosol, soluble salts, and the like.
As shown in fig. 2, it is known from the mechanism of formation of wet plumes that the wet plumes are more likely to be formed when the ambient temperature is lower than when the ambient temperature is higher. Therefore, when the ambient temperature is reduced, the heat exchange function of the fluoroplastic heat exchanger 41 is started, and the temperature of the flue gas is further reduced while the demisting and dedusting effects are achieved, and the water in the flue gas is condensed and separated out, so that the phenomenon of wet smoke plume can be effectively eliminated after the flue gas is heated by the heater; and when the ambient temperature is higher, the flue gas condensation width reduction required for completely eliminating the wet flue gas plume is smaller, and the heating temperature rise is smaller, at this time, the heat exchange function of the fluoroplastic heat exchanger 41 can be not required to be started, namely, the fluoroplastic heat exchanger 41 only plays roles of demisting and dedusting. That is, the fluoroplastic heat exchanger 41 can defog and remove dust from the flue gas passing through the spraying device 31, and can selectively start and stop its heat exchange function according to the ambient temperature, so that the applicability is good.
In summary, the spraying device 31 of the first cooling subsystem can greatly reduce the temperature of the flue gas, so that the water in the flue gas is condensed and flows into the circulating water tank 32 together with the spray water, when the water quantity in the circulating water tank 32 exceeds the water quantity required by the first circulating water loop, the excessive water enters the water storage tank 6 from the overflow port of the circulating water tank 32, wherein the excessive water mainly comes from the water condensed by the flue gas, namely, the flue gas is effectively extractedThe temperature and the moisture of the flue gas passing through the first cooling subsystem and the second cooling subsystem are reduced, the phenomenon of moisture plume can be completely eliminated after the flue gas is heated by the heater 5, and meanwhile, most of dust, bivalent mercury and SO are removed 3 The pollutants such as aerosol, soluble salt and the like are collected and captured by condensed water and spray water after passing through the first cooling subsystem and the second cooling subsystem so as to be removed from the flue gas, thereby achieving the purpose of purifying the flue gas.
The second cooling subsystem in the above embodiment further includes a heater 42, where the heater 42 is used to heat the boiler air supply, and the cold source water of the fluoroplastic heat exchanger 41 and the heat source water of the heater 42 form a second circulating water loop 43. The fluoroplastic heat exchanger 41 cools the wet flue gas by using cold source water, and the heater 42 heats the hot flue gas by using heat source water as the supply air of the boiler, the cold source water and the heat source water form a second circulating water loop 43, the second circulating water loop 43 is a closed circulating system, and the internal circulating water is clean and free of impurities, so that risks of corrosion, scaling and the like caused by pipelines can be avoided, and the structure and the material of the heater 42 are not limited, for example, a partition wall type heat exchanger made of ordinary carbon steel can be adopted.
When the ambient temperature decreases, the heat exchange function of the fluoroplastic heat exchanger 41 is started, the second circulating water loop 43 circulates normally, the flue gas is subjected to secondary cooling through the fluoroplastic heat exchanger 41 to be reduced to a lower temperature, the boiler air supply is heated through the air heater 42 to improve the boiler efficiency, at this time, the fluoroplastic heat exchanger 41 plays the roles of demisting and dedusting, and simultaneously, the air heater 42 is combined to play the role of recycling the flue gas waste heat to improve the boiler efficiency, after the flue gas is cooled down twice through the first cooling subsystem and the second cooling subsystem, the temperature and the moisture content of the flue gas are reduced, and after the flue gas is heated up through the heater 5, the flue gas is in an unsaturated state to a certain extent, and the phenomenon of dehumidification smoke plume can be realized. When the ambient temperature is higher, the heat exchange function of the fluoroplastic heat exchanger 41 is not required to be started, the boiler air supply is not required to be heated, the second circulating water loop 43 is closed, and at the moment, the fluoroplastic heat exchanger 41 plays roles in demisting and dedusting, namely, bivalent mercury and SO remained in the flue gas are further removed 3 Aerosol(s),Soluble salts, and the like. That is, the present system can selectively open and close the second circulation water circuit 43 according to conditions such as ambient temperature, while ensuring the phenomenon of eliminating the plume of dehumidification, and at the same time, ensuring the maximum economical efficiency.
In the above embodiment, the wet smoke plume abatement system further includes the bypass flue 9, the bypass flue 9 and the heater 42 are connected in parallel in the boiler air supply flue, when the external environment temperature is low, the door plate 91 is closed, i.e. the bypass flue 9 is closed, the boiler air supply is heated by the heater 42, when the external environment temperature is high, the heater 42 does not need to exchange heat, the door plate 91 is opened, i.e. the bypass flue 9 is opened, at this time, the boiler air supply passes through the bypass flue 9, and the boiler air supply resistance can be reduced. The door stop plate 91 may be an electric door stop plate 91, so that remote operation can be realized.
In the above embodiment, the variable frequency water pump 44 and the electric flow rate regulating valve 45 are provided in each of the first and second circulating water circuits 33 and 43 so as to perform an operation of opening and closing or flow rate control of the first and second circulating water circuits 33 and 43 according to a specific use condition or environmental factors. Meanwhile, the variable frequency water pump 44 and the electric flow rate regulating valve 45 facilitate remote control. At the same time, a flowmeter 46 may be provided in the first and second circulating water circuits 33 and 43 to monitor the water flow rate. When the water flow rate in the second circulation water circuit 43 is monitored to be small, purified water can be fed from the water feed inlet 431.
In the above embodiment, the test and elimination system further includes a cooler housing 7, which is connected between the flue gas outlet of the desulfurizing tower and the heater 5, the fluoroplastic heat exchanger is disposed above the spraying device 31, and both are located in the cooler housing 7, that is, the flue gas inlet 1 is the only flue gas inlet of the cooler housing 7, the flue gas discharged from the flue gas outlet of the desulfurizing tower enters the cooler housing 7 from the flue gas inlet 1, is cooled twice by the spraying device 31 and the fluoroplastic heat exchanger 41, is heated by the heater 5, and is finally discharged from the chimney to the external environment. At this time, the circulation water tank 32 is connected to the drain port of the cooler housing 7, and condensed water of the first cooling subsystem and the second cooling subsystem and shower water of the shower device 31 can be collected at the same time.
In the above embodiment, the nozzle of the spraying device 31 is a glass fiber reinforced plastic nozzle, and the inner wall of the cooler housing 7 and the inner wall of the first circulating water loop 33 are coated with an anti-corrosion coating, and the spray water is mixed with SO after cooling and cleaning the flue gas 3 The aerosol and the soluble salt and other pollutants can cause the problems of pipeline structure or blockage, the corrosion resistance of the glass fiber reinforced plastic nozzle is better, and meanwhile, the anti-corrosion coating can protect equipment and prolong the service life.
In the above embodiment, the cooler housing 7 is further provided with the turbulence device 8, and the turbulence device 8 is located below the spraying device 31, that is, on one side of the spraying device 31 facing the upstream of the airflow, after the flue gas flows through the turbulence device 8, the airflow is uniform and stable, so that the shower water and the flue gas contact uniformly, and the cooling and dust removing effects are improved.
In the above embodiment, the first cooling subsystem further includes a heat exchange tower, the spray device 31, the heat exchange tower and the circulation water tank 32 form a first circulation water loop 33, the circulation water tank 32 is provided with a water inlet 321, a water outlet 322 and an overflow port 323, wherein the water inlet 321 is communicated with the water outlet of the cooler housing 7, the water outlet 322 is communicated in the first circulation water loop 33, the overflow port 323 is communicated with the water storage tank 6, and the water outlet 322 is lower than the overflow port 323. The spray water of the spray device 31 will rise in temperature after cooling the flue gas, and the spray water with a higher temperature enters the circulating water tank 32 and is reused as spray water to spray the flue gas after being cooled by the heat exchange tower. After a period of operation, the water quantity of the spray water is fixed, the water level in the circulating water tank 32 rises along with the increase of condensed water in the flue gas, and when the water level rises to the overflow port 323, the water can flow out and enter the water storage tank 6 for storage. The water in the water storage tank 6 can be used for supplementing water for the wet desulfurization system, and when the water yield is larger than the water consumption of the water supplementing of the wet desulfurization system, the water in the water storage tank 6 can be correspondingly treated to supply the rest water consumption of the power plant so as to save the water of the power plant. Under the hot high-temperature environment in summer, when the water storage tank 6 cannot meet the requirement of stably supplying the water quantity for wet desulfurization, water can be supplied to the water storage tank 6 in a supplementing mode, so that the water storage tank 6 can achieve the effect of stably supplying water for the wet desulfurization system.
In the above embodiment, the heat exchange tower is an air cooling tower 35, that is, the internal circulating water exchanges heat with the air in the external environment to realize cooling, and the fin heat exchange tubes 351 and the fans 352 are arranged in the air cooling tower 35, where the fin heat exchange tubes 351 are communicated with the first circulating water loop 33, and the fans 352 are used for accelerating cooling of the circulating water in the fin heat exchange tubes 351, so that the heat exchange implementation mode is simpler. Of course, the heat of the circulating water can be recycled, for example, the heat exchange tower is set to provide heat for other systems so as to realize the effect of cooling the circulating water.
A dosing device 34 for adjusting the ph of the circulating water is also provided in the circulating water tank 32 in the above embodiment. The circulating water tank 32 mainly plays a role in adjusting water quality and balancing water level, the water quality state in the circulating water tank 32 is detected through the dosing device 34, and the dosing amount of the dosing device 34 is adjusted to maintain the water quality of the whole system so as to meet the use requirement.
In the above embodiment, the heater 5 is a hot overgrate air heater, a flue gas heat exchanger, a steam heater, or the like, and is not particularly limited, and may be set according to the actual situation of the power plant.
The system not only can eliminate the wet smoke plume phenomenon of the chimney, but also can remove water from the flue gas, as the supplementary water of the wet desulfurization system, achieves the aim of zero water consumption of the desulfurization system, solves the wet water consumption problem of the power plant in the northwest area of water shortage, and can cooperatively remove fine particles, bivalent mercury and SO in the wet flue gas 3 Aerosol, soluble salt and other pollutants, and effectively purifies the environment.
The foregoing is merely a preferred embodiment of the present invention and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the principles of the present invention, which are intended to be comprehended within the scope of the present invention.
Claims (10)
1. The wet smoke plume eliminating system is characterized by comprising a first cooling subsystem, a second cooling subsystem and a heater (5), wherein the first cooling subsystem, the second cooling subsystem and the heater are sequentially arranged between a flue gas outlet of a desulfurizing tower and a chimney;
the first cooling subsystem comprises a first circulating water loop (33), a spraying device (31) and a circulating water tank (32) are arranged in the first circulating water loop (33), and the second cooling subsystem comprises a fluoroplastic heat exchanger (41) which is communicated with the spraying device (31);
the circulating water tank (32) is communicated with the first cooling subsystem and the second cooling subsystem and is used for collecting condensed water and spray water and providing circulating water which circulates along the first circulating water loop (33) and enters the spray device (31);
the water tank (6) is communicated with an overflow port (323) of the circulating water tank (32).
2. Wet smoke plume abatement system according to claim 1, characterized in that the second cooling subsystem further comprises a heater (42) for heating the boiler air supply, the cold source water of the fluoroplastic heat exchanger (41) and the heat source water of the heater (42) forming an openable and closable second circulation water loop (43).
3. Wet smoke plume abatement system according to claim 2, further comprising a bypass flue (9), the bypass flue (9) being connected in parallel with the heater (42) in the boiler air supply flue, the bypass flue (9) being provided with an openable and closable shutter plate (91).
4. The wet smoke plume abatement system according to claim 2, wherein a variable frequency water pump (44) and an electric flow rate regulating valve (45) are provided in both the first and second circulating water circuits (33, 43).
5. Wet plume abatement system according to any one of claims 1-4, further comprising a cooler housing (7) provided between the desulfurizing tower flue gas outlet and the heater (5), the fluoroplastic heat exchanger (41) being provided above the spray device (31) both being located within the cooler housing (7), the circulation water tank (32) being in communication with a water outlet of the cooler housing (7).
6. The wet plume abatement system according to claim 5, wherein the nozzles of the spray device (31) are glass fibre reinforced plastic nozzles and the inner wall of the cooler housing (7) and the inner wall of the first circulating water circuit (33) are coated with an anti-corrosive coating.
7. Wet plume abatement system according to claim 5, characterized in that a turbulence device (8) is also provided in the cooler housing (7), the turbulence device (8) being located below the spray device (31).
8. The wet plume abatement system according to any one of claims 1-4, wherein the first cooling subsystem further comprises an air cooling tower (35), a fin heat exchange tube (351) and a fan (352) are arranged in the air cooling tower (35), and the spray device (31), the fin heat exchange tube (351) and the circulating water tank (32) form the first circulating water loop (33).
9. Wet smoke abatement system according to any one of claims 1-4, characterized in that a dosing device (34) for adjusting the ph of the circulating water is arranged in the circulating water tank (32).
10. Wet smoke plume abatement system according to any one of claims 1-4, characterized in that the heater (5) is a hot overgrate air heater, a flue gas heat exchanger or a steam heater.
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| CN109289430B (en) * | 2018-11-07 | 2023-06-30 | 国能龙源环保南京有限公司 | Dry-wet coupling integrated smoke whitening and dust removing device |
| CN109529559A (en) * | 2018-12-04 | 2019-03-29 | 昊姆（上海）节能科技有限公司 | Flue gas takes off white plumage system and its takes off white plumage method |
| CN109482035B (en) * | 2019-01-03 | 2024-02-09 | 国电环境保护研究院有限公司 | Multistage condensing system of desulfurization flue gas |
| CN109876589A (en) * | 2019-03-15 | 2019-06-14 | 海宁马桥大都市热电有限公司 | The system and method for white purified treatment are taken off for Hazards in Power Plant flue gas |
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| CN111928683B (en) * | 2020-06-23 | 2021-08-27 | 中琉科技有限公司 | White smoke treatment device for mechanical cooling tower |
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