CN113483349A - Flue gas whitening and moisture recovery process and system based on combination of water cooling and air cooling - Google Patents
Flue gas whitening and moisture recovery process and system based on combination of water cooling and air cooling Download PDFInfo
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- 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
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- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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- 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
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- 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
- B01D53/1412—Controlling the absorption process
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- 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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- B01D53/26—Drying gases or vapours
- B01D53/265—Drying gases or vapours by refrigeration (condensation)
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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- B01D2258/00—Sources of waste gases
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Abstract
A flue gas de-whitening and moisture recovery process and system based on combination of water cooling and air cooling comprises the following steps: injecting hot flue gas from the side surface of the filler cooling tower, spraying cooling water from the top of the filler cooling tower and the top of the filler primary cooling tower respectively, and enabling the hot flue gas to be in cross-flow contact with the cooling water and the hydrophilic filler with the high specific surface area of the micro interface to obtain purified flue gas and heated cooling water; spraying circulating water from the top of the humidifying tower and the top of the dehumidifying tower respectively, and allowing the heated cooling water to enter the humidifying tower and contact with ambient air and the circulating water for cooling to obtain humid air; moisture-containing air enters from the top of the dehumidifying tower and contacts with ambient air and circulating water to cool and resolve moisture, so that the technical problem that the recovery efficiency is low due to the complex recovery process and high recovery energy consumption in the traditional flue gas whitening and moisture recovery method is solved, and the method belongs to the technical field of flue gas whitening and moisture recovery.
Description
Technical Field
The application relates to the technical field of flue gas whitening and moisture recovery, in particular to a flue gas whitening and moisture recovery process and system based on combination of water cooling and air cooling.
Background
Water is one of the most important natural resources on the earth and is an indispensable important resource in life and production of people. Water resources are important factors for promoting the sustainable development of the whole society and economy and promoting the progress of industrial civilization. However, the underground water and fresh water available for direct human use is not yet 0.36% of the total amount; the total amount of water resources in China is 2.8 billion cubic meters, ranks 6 th in the world, but the average water resource amount of people is only 25 percent of the average level in the world, and is listed as one of 13 countries which are the most water-poor in the world by united nations. According to internationally recognized standards, mild water shortage is achieved when the average water resource is less than 3000 cubic meters; the average water resource is moderate water shortage below 2000 cubic meters; the average water resource is less than 1000 cubic meters, and the water is severely deficient; the average water resource is less than 500 cubic meters, which is extremely water-deficient. At present, 16 provinces (districts and cities) in China have the per capita water resource amount (excluding the water passing through the border) lower than the serious water shortage line, and 6 provinces and districts (Ningxia, Hebei, Shandong, Henan, Shanxi and Jiangsu) have the per capita water resource amount lower than 500 cubic meters, and are regions with extreme water shortage. The urban water resource in China is extremely short and has wide related problems, the urban water shortage in China is 60 hundred million m3 every year, the economic loss caused by water shortage is about 2000-4000 million yuan every year, and the related and affected fields comprise: the serious water shortage problem in industry, agriculture, construction industry, resident life and the like causes the modernized construction process of cities and towns, the increase of GDP and the improvement of the living standard of residents in China to be limited.
On the other hand, the moisture discharged to the atmosphere in the industries of coal burning thermoelectricity, steel, coking, cement, building materials, nonferrous metals, petrochemical industry and the like in China each year exceeds 160 hundred million tons. Taking the coal-electricity and thermoelectric industry as an example, when 1 ton of standard coal is combusted, 1 ton of moisture is taken away by wet flue gas, and 5 tons of water is discharged by a circulating water cooling tower. 1.5 tons of moisture is diffused when 1 ton of steel is produced in the steel industry, and the moisture is discharged by about 15 hundred million tons in the whole industry every year. In the coal coking industry, 0.5 ton of moisture is discharged when each 1 ton of coke is quenched in a wet mode, moisture is discharged when the coke oven flue gas is desulfurized in a wet mode and desulfurized in a dry mode, and the total moisture discharged to the atmosphere in the coal coking industry is more than 2 hundred million tons each year. In the gas industry, 2 cubic meters and 1.55 kilograms of water vapor can be generated when 1 cubic meter of natural gas is combusted, and more than 3 hundred million tons of water are discharged every year in China. This white smoke emitted into the atmosphere not only causes visual pollution, but also wastes valuable water resources. Does not contribute to removing haze, saving water and saving energy.
It is known that the density of water vapor in the smoke is 0.804kg/m3, the water vapor is lighter than air, the water vapor is easy to rise after leaving a chimney, the water vapor is saturated and condensed into water drops after being mixed with ambient low-temperature air and cooled, the density of the water drops is 1000kg/m3, the water drops with extremely fine particles and much higher density than the air are suspended and accumulated in the atmosphere to form fog, and the fog drops refract and scatter light, so that smoke plumes are white or gray, which is commonly called as 'big white smoke', and influence flight and highway traffic. Can scrape away or condense through wind, rain, snow and descend, meet quiet and stable weather, dense fog is just like a big lid, and itself has the dissolubility particulate matter to separate out, still absorbs other pollution sources particulate matter, separation its diffusion, and accumulation in the fog layer has just formed the haze, and this is the cause and the process of the haze frequently appears in china.
Therefore, the method has important significance for China in removing the white of the smoke and recycling the unconventional water resources. The dehumidification-based smoke whitening is adopted, and if 70% of moisture in the smoke is recovered, more than 100 hundred million tons of water vapor and contained heat can be recovered every year nationwide, so that the energy-saving effect is quite remarkable. However, the existing flue gas de-whitening technology mainly comprises a combination of a spray cooling and lithium bromide absorption heat pump and a spray cooling and electromagnetic induction heating and de-whitening technology, so that the temperature of the flue gas is reduced from 50 ℃ to 25 ℃, and the humidity is reduced from 14% to 3%.
The technique of recovering moisture by humidification cooling-dehumidification is considered to be one of promising techniques. The hot flue gas and cooling water are contacted in the packed tower to reduce the temperature, and the cooling water is heated and then the moisture is recovered by a humidifying-dehumidifying packed tower process. According to Newton's cooling theorem, Q is KA (T-T0), (Q is heat transfer quantity, K is heat transfer coefficient, A is heat transfer area, and T-T0 is heat transfer temperature difference), in order to improve the efficiency of mass transfer and heat transfer, the larger the packing area in the packed tower is, the better the packing area is, and the better the hydrophilic property is; the design of the packed column is also very important, and the Re number and the K are improved as much as possible. Meanwhile, in order to improve the performance of the whole system, the recovery of heat energy and saturated steam by multi-stage multi-effect spray water is also a main means. In view of the above, the invention designs a new process for removing white smoke and recovering moisture by using the micro-interface high specific surface area hydrophilic regular packing based on the method for recovering air moisture of the micro-interface high specific surface area regular packing, the cross-flow bed packing spray tower and the counter-flow humidification-dehumidification packing tower developed in the earlier stage.
Disclosure of Invention
The application aims to provide a flue gas whitening and moisture recovery process and system based on combination of water cooling and air cooling, and aims to solve the technical problem that the recovery efficiency is low due to the fact that the recovery process is complex and the recovery energy consumption is high in the traditional flue gas whitening and moisture recovery method.
The first aspect of the embodiment of the application provides a flue gas whitening and moisture recovery process based on the combination of water cooling and air cooling, which is used for recovering hot flue gas and comprises the following steps:
s1, filling micro-interface high-specific-surface-area hydrophilic fillers into the filler cooling tower, the filler primary cooling tower, the humidifying tower and the dehumidifying tower, and injecting the hot flue gas from the side surface of the filler cooling tower;
s2, spraying cooling water to the inside of the filler cooling tower and the inside of the filler primary cooling tower from the top of the filler cooling tower and the top of the filler primary cooling tower respectively, and enabling the hot flue gas, the cooling water and the micro-interface high-specific-surface-area hydrophilic filler to be in cross-flow contact with each other in the filler cooling tower and the filler primary cooling tower to obtain purified flue gas and heated cooling water;
s3, spraying circulating water to the interior of the humidifying tower and the interior of the dehumidifying tower from the top of the humidifying tower and the top of the dehumidifying tower respectively, enabling the heated cooling water to enter the interior of the humidifying tower from the bottom of the humidifying tower, and contacting with ambient air and the circulating water to cool to obtain humid air;
and S4, enabling the moisture-containing air to enter the dehumidification tower from the top of the dehumidification tower, contacting with ambient air and the circulating water, cooling and resolving moisture.
In one embodiment, the cooling water coming out of the top of the humidifying tower contacts with the circulating water in the dehumidifying tower through a cooling coil to be cooled with ambient air, so that mixed air is obtained, and the mixed air is discharged into a flue gas inlet.
In one embodiment, the micro-interface high specific surface area hydrophilic filler has a specific surface area of 3000m2/m3Bulk density of 320-650 kg/m3The void ratio is 70-90%, the F factor is 1.5-3.5, the wave pitch is 10-55 mm, and the tooth form angle is 30-80.
In one embodiment, the surface of the micro-interfacial high specific surface area hydrophilic filler is coated with Al2O3-MnO2And (c) a complex.
In one embodiment, inclined plates are respectively arranged at the flue gas inlet and outlet of the filler cooling tower and the filler primary cooling tower, and water vapor in the hot flue gas forms water drops to fall after entering the filler cooling tower and the filler primary cooling tower for cooling.
In one embodiment, the bottom of the humidifying tower and the bottom of the dehumidifying tower are provided with air inlet grids, and the ambient air enters the humidifying tower and the dehumidifying tower from the air inlet grids.
The second aspect of the embodiment of the application provides a flue gas whitening and moisture recovery system based on combination of water cooling and air cooling, which comprises a filler cooling tower, a filler primary cooling tower, a humidifying tower and a dehumidifying tower, wherein the filler cooling tower, the filler primary cooling tower, the humidifying tower and the dehumidifying tower are internally provided with micro-interface high-specific-surface-area hydrophilic fillers, hot flue gas, cooling water and the micro-interface high-specific-surface-area hydrophilic fillers are in cross flow contact with the inside of the filler cooling tower and the inside of the filler primary cooling tower to obtain purified flue gas and cooling water after temperature rise, the cooling water after temperature rise enters the inside of the humidifying tower from the bottom of the humidifying tower and is in contact with ambient air and circulating water for temperature reduction to obtain humid air, the humid air enters the inside of the dehumidifying tower from the top of the dehumidifying tower and is in contact with the ambient air and the circulating water, the temperature was decreased and the water content was analyzed.
In one embodiment, the system further comprises a cooling water storage tank, wherein the circulating water is arranged in the cooling water storage tank, and the circulating water is pumped into the humidifying tower and the dehumidifying tower through a circulating water pump.
In one embodiment, the humidifying tower and the dehumidifying tower are respectively provided with a cooling coil inside, and the two cooling coils are communicated.
In one embodiment, the humidifying tower and the dehumidifying tower are made of acrylic, polypropylene (PPR) or plastic materials.
Compared with the traditional flue gas whitening and moisture recovery method, the flue gas whitening and moisture recovery process and system based on the combination of water cooling and air cooling, provided by the invention, have the advantages that micro-interface hydrophilic regular packing is filled in all the towers, and the specific surface area is up to 2500m2/m3And the mass transfer and heat transfer efficiency of the filler cooling tower and the filler primary cooling tower is improved. The hot flue gas and the cooling water are in cross-flow contact, the circulating cooling water after heat absorption is cooled by two closed series cooling towers combining water cooling and air cooling, the tops of the two closed cooling towers are provided with cooling coils made of metal conductors, the cooling coils of the two towers are communicated, the hot water is in a tube pass, and the cold air and the spray water are in a shell pass. The side surfaces of the bottoms of the two towers are provided with air inlet grids, water inlet and outlet pipelines are arranged at the inlets of the air grids, air coming out of the water cooling and air cooling dehumidification tower can enter the inlet of the hot flue gas filler cooling tower or the filler primary cooling tower through the draught fan to be cooled, so that the cooling water quantity is saved, and the air can also be directly introduced into a chimney. The process not only achieves the purposes of removing white from the flue gas and efficiently recovering the moisture in the flue gas, but also skillfully reduces the temperature and further recovers the moisture by utilizing an air-cooled humidifying-dehumidifying packed tower. Overcomes the defects of ' spray cooling and electromagnetic whitening ' and ' sprayThe cooling and absorption type smoke whitening technology has the defects of complexity and high operation cost, and can also be used for whitening ship smoke or other waste heat air.
Drawings
Fig. 1 is a schematic flow chart of a flue gas whitening and moisture recovery process based on a combination of water cooling and air cooling according to an embodiment of the present disclosure;
fig. 2 is a schematic structural diagram of a flue gas whitening and moisture recovery system based on a combination of water cooling and air cooling according to an embodiment of the present application.
The symbols in the drawings illustrate that:
1. a packed cooling tower; 2. a packed primary cooling tower; 3. a humidifying tower; 4. a dehumidification tower; 5. micro-interface high specific surface area hydrophilic filler; 6. hot flue gases; 7. a chimney; 8. a first circulating water pump; 9. a second circulating water pump; 10. cooling the water storage tank; 11. an air inlet grille; 12. an induced draft fan; 13. and cooling the coil.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present application clearer, the present application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
The traditional humidifying-dehumidifying type salt-containing wastewater recovery process usually adopts random packing and metal or ceramic regular packing; generally, these structured packings have a maximum specific surface area of not more than 700m2/m3Surface hydrophilic modification is not intentionally made; according to the mass transfer theory, Q ═ kda(C0-Ct) I.e. in the concentration difference (C)0-Ct) Under certain conditions, the mass transfer rate and the mass transfer coefficient kdProportional to the specific surface area a per unit volume of the filler, that is, the higher the specific surface area of the filler, the faster the mass transfer rate; on the other hand, the mass transfer coefficient kdThe Re number of the fluid is related to the thickness of a Plant boundary layer, the Re number is closely related to the hydrophilicity (liquid holdup) of the surface of the filler, when the filler has strong hydrophilicity, the surface liquid holdup is large, the mass transfer is fast,the high Re number can not cause flooding, so that the operation is deteriorated; meanwhile, the traditional filler has no hydrophilic function, so that the gas-liquid mass transfer rate of hot flue gas and spray wastewater on the surface of the filler only depends on the mass transfer rate and the gas-liquid equilibrium theorem.
Referring to fig. 1, a schematic flow chart of a flue gas whitening and moisture recovery process based on water cooling and air cooling combination according to an embodiment of the present application is shown, and for convenience of description, only the relevant portions of the present application are shown, and the following details are described below:
in one embodiment, a first aspect of the present application provides a flue gas whitening and moisture recovery process based on water cooling and air cooling combination, which is used for performing recovery processing on hot flue gas, and includes the following steps:
s1, micro-interface high specific surface area hydrophilic packing is filled in the packing cooling tower, the packing primary cooling tower, the humidifying tower and the dehumidifying tower, and hot flue gas is injected from the side surface of the packing cooling tower.
Specifically, filler cooling tower, filler primary cooling tower all adopt transparent ya keli board to make, and all adopt the rectangle structure, and the size is: the length x width x height is 1000x1200x1000, micro-interface high specific surface area hydrophilic filler is filled in the filler cooling tower, the filler primary cooling tower, the humidifying tower and the dehumidifying tower, and the surface of the micro-interface high specific surface area hydrophilic filler is coated with Al2O3-MnO2The specific surface area of the micro-interface high specific surface area hydrophilic filler is 3000m2/m3Bulk density of 320-650 kg/m3The void ratio is 70-90%, the F factor is 1.5-3.5, the wave distance is 10-55 mm, the tooth form angle is 30-80, the high-efficiency mass transfer and heat transfer can be realized, hot flue gas at 60-90 ℃ is injected from the side surface of a filler cooling tower, the filler cooling tower is communicated with the interior of a filler primary cooling tower, and the hot flue gas is circulated to the filler primary cooling tower through the filler cooling tower.
And S2, spraying cooling water to the inside of the filler cooling tower and the inside of the filler primary cooling tower from the top of the filler cooling tower and the top of the filler primary cooling tower respectively, and enabling the hot flue gas, the cooling water and the micro-interface high-specific-surface-area hydrophilic filler to be in cross-flow contact with each other in the filler cooling tower and the filler primary cooling tower to obtain purified flue gas and heated cooling water.
Specifically, the temperature of cooling water sprayed from the top is usually 20-23 ℃, the cooling water, hot flue gas and hydrophilic filler with high specific surface area of a micro interface are heated after being contacted with the inside of a filler cooling tower and the inside of a filler primary cooling tower in a cross flow manner, the temperature of the cooling water after heating can reach 35-50 ℃, the temperature of the hot flue gas and the cooling water is reduced to about 40 ℃ after heat exchange in the process, then the purified flue gas and the cooling air for air cooling after moisture recovery are discharged into a chimney together, a large amount of moisture contained in the flue gas is removed and the temperature is reduced in the filler cooling tower and the filler primary cooling tower, the flue gas is not whitish after being discharged from the chimney, and the flue gas is further purified by dust removal and the like; in order to prevent the thermal shock of materials caused by severe temperature reduction caused by high-efficiency mass transfer and heat transfer of the micro-interface filler, the invention adopts 2-tower or 3-tower cross-flow bed spray temperature reduction, and cooling water in the filler primary cooling tower is discharged and then sprayed to the interior of the filler temperature reduction tower.
In one embodiment, inclined plates with 30-degree inclined surfaces are respectively arranged at the smoke inlet and the smoke outlet of the filler cooling tower and the filler primary cooling tower, the design only allows water drops formed by cooling water vapor in hot smoke entering the filler spray tower to only enter the filler cooling tower and the filler primary cooling tower to fall but not to diffuse into the smoke, and after partial phase change water and condensed water are cooled and recovered, the smoke enters a chimney to be discharged, so that white smoke is eliminated.
And S3, spraying circulating water into the humidifying tower and the dehumidifying tower from the top of the humidifying tower and the top of the dehumidifying tower respectively, and enabling the heated cooling water to enter the humidifying tower from the bottom of the humidifying tower and contact with ambient air and the circulating water for cooling to obtain humid air.
Specifically, humidifying tower and dehumidification tower all design into phi 900x 2000's cylinder type countercurrent contact spray tower, the bottom that gets into humidifying tower behind the moisture in the cooling water intensification and the recovery flue gas, humidifying tower's bottom and dehumidification tower's bottom are equipped with the air intlet grid, and ambient air enters into humidifying tower and dehumidification tower's inside from the air intlet grid, and the ambient air cooling that the cooling water utilization got into from the bottom grid and through the circulating water that sprays continue to cool down, sets up the circulating water in the cooling water storage pond, the circulating water pump go into humidifying tower with dehumidification tower's inside, humidifying tower bottom's circulating water can be regularly followed the cooling water storage pond and supplemented.
And S4, enabling the moisture-containing air to enter the dehumidification tower from the top of the dehumidification tower, contacting with ambient air and circulating water, cooling and resolving moisture.
Specifically, the humid air (about 35-40 ℃) from the top of the humidifying tower enters the bottom of the closed dehumidifying tower, is mixed with the ambient air entering from the bottom grid of the dehumidifying tower, and is cooled and analyzed for moisture; meanwhile, cooling coils made of metal conductors are arranged at the tops of the humidifying tower and the dehumidifying tower, cooling water from the top of the humidifying tower contacts with circulating water through the cooling coils and ambient air in the dehumidifying tower to be cooled (to about 20-23 ℃), the cooling coils of the two towers are communicated, hot water is in a tube pass, and cold air and spray water are in a shell pass; the mixed air (about 30 ℃) cooled and dehumidified in the dehumidification tower is discharged into a flue gas inlet of a chimney through a draught fan; and circulating water of the humidifying tower and the dehumidifying tower after being cooled by ambient air, the cooling coil and the filler is discharged into the cooling water storage tank for continuous recycling.
The utility model provides an utilize ambient air to carry on behind the humidification-dehumidification packed column to continue to retrieve moisture and cooling, the air after the cooling gets back to hot flue gas entry again, make hot flue gas cooling volume diminish, the vapor that contains condenses into the water droplet fast and separates out, because the specific heat of water is about 3 times of flue gas, consequently, the flow proportion of air and hot flue gas must be adjustable, just can reach best flue gas whitening and moisture recovery effect, 1/4-1/6 of flue gas flow is got to general cooling water yield, 1.0-3.0 times of cooling water yield is got to the flow of cooling air.
In the embodiment, the flue gas flow is 3500Nm3/h, and the tower inlet linear velocity is about 1.0 m/s. The cooling water temperature is 20-22 ℃, and the cooling water flow is 550m 3/h. The flow rate of the circulating water of the humidification-dehumidification tower is that normal temperature water can be injected into the cooling water storage tank when the system is started, the flow rate of a cooling air induced draft fan is 2000m3/h, then the temperature of cooling recycled water entering the cooling water storage tank is kept to be not more than 22 ℃ all the time in operation so as to meet the design requirement, and after the system is operated for 1 week, the operation cost (power consumption) and the wastewater recovery rate are tested, and the results are shown in table 1.
TABLE 1 Hot flue gas and high specific surface area hydrophilic structured packing humidifying-dehumidifying tower waste water recovery process parameters
It can be seen that the process not only achieves the purposes of removing the white color of the flue gas and efficiently recovering the moisture in the flue gas, but also skillfully cools and further recovers the moisture by utilizing an air-cooled humidifying-dehumidifying packed tower, so that the process has extremely high popularization. Meanwhile, all the packing towers are filled with hydrophilic packing with micro-interfaces and high specific surface area, so that the mass transfer efficiency and the heat transfer efficiency are high, the towers operate at normal pressure, are manufactured by plastics, have low investment cost and overcome the defects of the flue gas 'spray cooling and electromagnetic whitening' and 'spray cooling and absorption type flue gas whitening' technology.
Referring to fig. 2, a schematic structural diagram of a flue gas whitening and moisture recovery system based on water cooling and air cooling combination according to an embodiment of the present application is shown, and for convenience of description, only the relevant portions of the present application are shown, and the following details are described below:
the second aspect of the embodiment of the application provides a flue gas whitening and moisture recovery system based on combination of water cooling and air cooling, which comprises a filler cooling tower 1, a filler primary cooling tower 2, a humidifying tower 3 and a dehumidifying tower 4, wherein micro-interface high specific surface area hydrophilic fillers 5 are arranged inside the filler cooling tower 1, the filler primary cooling tower 2, the humidifying tower 3 and the dehumidifying tower 4, hot flue gas 6 is in cross-flow contact with cooling water and the micro-interface high specific surface area hydrophilic fillers 5 inside the filler cooling tower 1 and inside the filler primary cooling tower 2 to obtain purified flue gas and heated cooling water, and the heated cooling water enters the humidifying tower 3 from the bottom of the humidifying tower 3, and the moisture-containing air enters the inside of the dehumidifying tower 4 from the top of the dehumidifying tower 4 and contacts with the ambient air and the circulating water to cool and resolve moisture.
Specifically, the humidifying tower 3 and the dehumidifying tower 4 are made of acrylic, polypropylene (PPR) or plastic materials, and are designed to be phi 900x2000 cylindrical countercurrent contact spray towers, the temperature of hot flue gas 6 at 60-90 ℃ is reduced to about 40 ℃ after heat exchange in the filler cooling tower 1 and the filler primary cooling tower 2, then the flue gas and cooled air for air cooling after moisture recovery are discharged into a chimney 7, and meanwhile, the temperature of cooling water at 20-23 ℃ and the temperature of the hot flue gas 6 in cross flow from the side can reach 35-50 ℃ after being sprayed and heated by the filler cooling tower 1 and the filler primary cooling tower 2. Cooling water is heated and water in flue gas is recycled and then enters the bottom of the humidifying tower 3, air inlet grids 11 are arranged at the bottom of the humidifying tower 3 and the bottom of the dehumidifying tower 4, circulating water is arranged in the cooling water storage tank 10 and is pumped into the humidifying tower 3 and the dehumidifying tower 4 through a first circulating water pump 8 and a second circulating water pump 9, the cooling water is cooled by utilizing ambient air entering from the air inlet grids 11 and is continuously cooled after being sprayed by a circulating pump, humid air (about 35-40 ℃) coming out of the top of the humidifying tower 3 enters the bottom of the dehumidifying tower 4 and is mixed with the ambient air entering from the air inlet grids 11, and the cooling and the moisture are resolved. Cooling coils 13 are arranged inside the humidifying tower 3 and the dehumidifying tower 4, and the two cooling coils are communicated; cooling water from the top of the humidifying tower 3 contacts with spray water pumped by a second circulating water pump 9 in the dehumidifying tower 4 through a cooling coil 13 and air to reduce the temperature to about 20-23 ℃, mixed air (about 30 ℃) cooled and dehumidified in the dehumidifying tower 4 is discharged into a flue gas inlet of a chimney 7 through a draught fan 12, and circulating water obtained after the humidifying tower 3 and the dehumidifying tower 4 are cooled through ambient air, the cooling coil 13 and the hydrophilic packing 5 with the high specific surface area of the micro interface is discharged into a cooling water storage tank 10 for continuous recycling.
In summary, compared with the traditional flue gas whitening and moisture recovery method, the flue gas whitening and moisture recovery process and system based on the combination of water cooling and air cooling provided by the invention have the advantages that all towers are filled with micro-interface hydrophilic structured packing, and the specific surface area is as high as 2500m2/m3Improving the mass transfer and heat transfer efficiency of the filler cooling tower and the filler primary cooling towerAnd (4) rate. The hot flue gas and the cooling water are in cross-flow contact, the circulating cooling water after heat absorption is cooled by two closed series cooling towers combining water cooling and air cooling, the tops of the two closed cooling towers are provided with cooling coils made of metal conductors, the cooling coils of the two towers are communicated, the hot water is in a tube pass, and the cold air and the spray water are in a shell pass. The side surfaces of the bottoms of the two towers are provided with air inlet grids, water inlet and outlet pipelines are arranged at the inlets of the air grids, air coming out of the water cooling and air cooling dehumidification tower can enter the inlet of the hot flue gas filler cooling tower or the filler primary cooling tower through the draught fan to be cooled, so that the cooling water quantity is saved, and the air can also be directly introduced into a chimney. The process not only achieves the purposes of removing white from the flue gas and efficiently recovering the moisture in the flue gas, but also skillfully reduces the temperature and further recovers the moisture by utilizing an air-cooled humidifying-dehumidifying packed tower. The defects of complex technology and high operation cost of flue gas spray cooling and electromagnetic whitening and spray cooling and absorption type flue gas whitening are overcome, and the technology can also be used for whitening of ship flue gas or whitening of other waste heat air.
Various embodiments are described herein for various devices, circuits, apparatuses, systems, and/or methods. Numerous specific details are set forth in order to provide a thorough understanding of the overall structure, function, manufacture, and use of the embodiments as described in the specification and illustrated in the accompanying drawings. However, it will be understood by those skilled in the art that the embodiments may be practiced without such specific details. In other instances, well-known operations, components and elements have been described in detail so as not to obscure the embodiments in the description. It will be appreciated by those of ordinary skill in the art that the embodiments herein and shown are non-limiting examples, and thus, it can be appreciated that the specific structural and functional details disclosed herein may be representative and do not necessarily limit the scope of the embodiments.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present application and are intended to be included within the scope of the present application.
Claims (10)
1. A flue gas whitening and moisture recovery process based on combination of water cooling and air cooling is used for recovering hot flue gas, and is characterized by comprising the following steps:
s1, filling micro-interface high-specific-surface-area hydrophilic fillers into the filler cooling tower, the filler primary cooling tower, the humidifying tower and the dehumidifying tower, and injecting the hot flue gas from the side surface of the filler cooling tower;
s2, spraying cooling water to the inside of the filler cooling tower and the inside of the filler primary cooling tower from the top of the filler cooling tower and the top of the filler primary cooling tower respectively, and enabling the hot flue gas, the cooling water and the micro-interface high-specific-surface-area hydrophilic filler to be in cross-flow contact with each other in the filler cooling tower and the filler primary cooling tower to obtain purified flue gas and heated cooling water;
s3, spraying circulating water to the interior of the humidifying tower and the interior of the dehumidifying tower from the top of the humidifying tower and the top of the dehumidifying tower respectively, enabling the heated cooling water to enter the interior of the humidifying tower from the bottom of the humidifying tower, and contacting with ambient air and the circulating water to cool to obtain humid air;
and S4, enabling the moisture-containing air to enter the dehumidification tower from the top of the dehumidification tower, contacting with ambient air and the circulating water, cooling and resolving moisture.
2. The flue gas de-whitening and moisture recovery process based on the combination of water cooling and air cooling as claimed in claim 1, wherein the cooling water coming out of the top of the humidifying tower contacts with the circulating water through a cooling coil and cools with the ambient air inside the dehumidifying tower to obtain the mixed air, and the mixed air is discharged into the flue gas inlet.
3. The flue gas whitening and moisture recovery process based on the combination of water cooling and air cooling as claimed in claim 1, wherein the specific surface area of the micro-interface high specific surface area hydrophilic filler is 3000m2/m3Bulk density of 320-650 kg/m3The void ratio is 70-90%, the F factor is 1.5-3.5, the wave pitch is 10-55 mm, and the tooth form angle is 30-80.
4. The flue gas whitening and moisture recovery process based on the combination of water cooling and air cooling as claimed in claim 1, wherein the surface of the micro-interface high specific surface area hydrophilic filler is coated with Al2O3-MnO2And (c) a complex.
5. The flue gas de-whitening and moisture recovery process based on the combination of water cooling and air cooling as claimed in claim 1, wherein inclined plates are respectively arranged at the flue gas inlet and outlet of the filler cooling tower and the filler primary cooling tower, and water vapor in the hot flue gas forms water drops to fall after entering the filler cooling tower and the filler primary cooling tower for cooling.
6. The flue gas de-whitening and moisture recovery process based on the combination of water cooling and air cooling as claimed in claim 1, wherein the bottom of the humidifying tower and the bottom of the dehumidifying tower are provided with air inlet grids, and the ambient air enters the humidifying tower and the dehumidifying tower from the air inlet grids.
7. A flue gas whitening and moisture recovery system based on combination of water cooling and air cooling is characterized by comprising a filler cooling tower, a filler primary cooling tower, a humidifying tower and a dehumidifying tower, wherein micro-interface high-specific-surface-area hydrophilic fillers are arranged inside the filler cooling tower, the filler primary cooling tower, the humidifying tower and the dehumidifying tower, hot flue gas, cooling water and the micro-interface high-specific-surface-area hydrophilic fillers are in cross flow contact with the inside of the filler cooling tower and the inside of the filler primary cooling tower to obtain purified flue gas and heated cooling water, the heated cooling water enters the humidifying tower from the bottom of the humidifying tower and is in contact with ambient air and circulating water to be cooled to obtain humid air, the humid air enters the dehumidifying tower from the top of the dehumidifying tower and is in contact with the ambient air and the circulating water, the temperature was decreased and the water content was analyzed.
8. The system for de-whitening flue gas and recovering moisture based on the combination of water cooling and air cooling as claimed in claim 7, further comprising a cooling water storage tank, wherein the cooling water storage tank is provided with the circulating water, and the circulating water is pumped into the humidifying tower and the dehumidifying tower through a circulating water pump.
9. The system for de-whitening and moisture recovery of flue gas based on the combination of water cooling and air cooling as claimed in claim 7, wherein the humidifying tower and the dehumidifying tower are both provided with cooling coils inside, and the two cooling coils are communicated with each other.
10. The system for de-whitening and moisture recovery from flue gas based on the combination of water cooling and air cooling as claimed in claim 7, wherein the humidifying tower and the dehumidifying tower are made of acrylic, polypropylene (PPR) or plastic materials.
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| CN202110685082.8A CN113483349A (en) | 2021-06-21 | 2021-06-21 | Flue gas whitening and moisture recovery process and system based on combination of water cooling and air cooling |
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| CN202110685082.8A CN113483349A (en) | 2021-06-21 | 2021-06-21 | Flue gas whitening and moisture recovery process and system based on combination of water cooling and air cooling |
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