A seawater dehumidification system using flue gas latent heat for humidification and dehumidification

Abstract

The invention discloses a seawater desalination system utilizing flue gas latent heat for humidification and dehumidification, and belongs to the technical fields of flue gas latent heat recovery, seawater desalination and water treatment. The invention utilizes the condensation latent heat of water vapor in boiler exhaust flue gas, and the humidification and dehumidification are integrated and arranged up and down, which speeds up the water output time of the system and improves the fresh water production efficiency of the system, thereby realizing the comprehensive utilization of flue gas latent heat recovery and seawater desalination, and the system can be widely used on a large scale and at low cost.

Description

Technical Field

[0001] The invention belongs to the technical field of flue gas latent heat recovery and water treatment, and in particular relates to a seawater desalination system utilizing flue gas latent heat for humidification and dehumidification. Background Art

[0002] Boilers are important energy conversion equipment, widely used in power, heating, petrochemical, chemical, steel, non-ferrous metals and other industries. Usually, the exhaust temperature of boilers exceeds 60°C. If the exhaust latent heat can be recycled and utilized, the exhaust temperature can be further reduced to below 30°C or even lower, and the energy-saving efficiency of the system can be greatly improved. Therefore, reducing the latent heat loss of boiler exhaust is of great significance to the energy conservation and emission reduction of the unit, especially the utilization of the latent heat of flue gas below 60°C, which is a technical problem that technicians in this field need to solve.

[0003] At the same time, producing fresh water from seawater or brackish water is an effective strategic approach to solve the shortage of fresh water resources. At present, there are two main types of relatively mature and large-scale technologies. One is the membrane desalination system using reverse osmosis membrane technology, and the other is the desalination system driven by thermal energy. The reverse osmosis membrane of the membrane system has a short life span and still consumes a large amount of conventional electricity. The use of thermal energy to drive is the mainstream of the current seawater desalination industry, but this type of system consumes a large amount of thermal energy, and a large amount of thermal energy cannot be effectively utilized. Therefore, using the latent heat of boiler flue gas for seawater desalination can not only improve the thermal efficiency of the boiler, but also wash the SO in the flue gas. x 、NO x It is the best solution for the green, low-carbon and high-quality development of boilers to eliminate pollutants such as smoke and dust. Summary of the invention

[0004] In order to solve the inherent defects of limited heat recovery and low recovery rate of traditional boiler feed water and flue gas through heat exchangers in the technical background, as well as the disadvantages of high cost and operating cost of exhaust heat recovery by absorption or compression heat pumps, the present invention provides a seawater desalination system that utilizes flue gas latent heat for humidification and dehumidification. In the flue gas dehumidification chamber, low-temperature and low-concentration seawater is sprayed and directly contacted with the boiler exhaust flue gas in countercurrent, so that the flue gas is saturated and cooled, and the pollutants are reduced and discharged from the system; at the same time, the air is humidified by the heated seawater in the humidification chamber and condensed into fresh water in the dehumidification chamber. The present invention can reuse the latent heat of flue gas, has the remarkable characteristics of low operating temperature (capable of utilizing the latent heat of flue gas below 60°C), rapid fresh water production and can be made of non-metal, etc., to achieve the production of pure water and NO x Displacement reduced.

[0005] In order to achieve the above object, the technical solution adopted by the present invention is as follows:

[0006] A seawater dehumidification system utilizing flue gas latent heat for humidification and dehumidification comprises a shell, the interior of the shell is divided into a condensation-dehumidification chamber and an evaporation-humidification chamber stacked on top and bottom, a fresh water collecting plate is arranged in the middle, the condensation-dehumidification chamber is provided with a flue gas dehumidification chamber, a low-temperature seawater sprayer is installed on the top of the flue gas dehumidification chamber, the flue gas dehumidification chamber is provided with a flue gas inlet, a smoke exhaust port, and a seawater collecting port, the condensation-dehumidification chamber is provided with a condensation heat exchange coil, the evaporation-humidification chamber is provided with an annular seawater sprayer on the top, and a porous filler stacking bed is provided on the bottom, an immersed heat exchange coil is arranged at the bottom of the shell, a circulating gas channel is arranged on the inner side of the shell, the air valve of the circulating gas channel is connected to the boiler, and the gas outlet of the circulating gas channel is arranged at the lower part of the evaporation-humidification chamber, so as to realize the communication between the condensation-dehumidification chamber and the evaporation-humidification chamber;

[0007] The low-temperature and low-concentration seawater is connected to the condensing heat exchange coil and the low-temperature seawater sprayer respectively through the filter device I, the exhaust end of the boiler is connected to the flue gas inlet, the return water / water supply port and the hot water supply port of the boiler are respectively connected to the hot side inlet and outlet of the plate heat exchanger, the plate heat exchanger is connected to the annular high-temperature seawater sprayer, the medium-temperature and low-concentration seawater flowing out of the flue gas dehumidification chamber is mixed with the seawater flowing out of the immersed heat exchange coil, and then connected to the cold side inlet of the plate heat exchanger through the filter device II.

[0008] Furthermore, the low-temperature and low-concentration seawater passes through the filtering device I and is then pumped into the condensing heat exchange coil and the low-temperature seawater sprayer through the circulating pump I.

[0009] Furthermore, a circulation pump II is installed between the filtering device II and the plate heat exchanger.

[0010] Furthermore, a one-way gas supply port is provided at the bottom of the circulating gas channel, and the circulating gas channel transports the gas to the gas outlet through a branch pipe to enter the evaporation-humidification chamber.

[0011] Furthermore, an overflow pipe I and an overflow pipe II are installed at the bottom of the shell and the flue gas dehumidification chamber, which are used to control the liquid level in the cylindrical shell and the flue gas dehumidification chamber respectively.

[0012] Furthermore, a fan is installed at the gas inlet of the circulating gas channel, and an electric regulating air valve is used on the air valve.

[0013] Furthermore, the height of the overflow pipe I is lower than the height of the gas outlet, and the height of the overflow pipe II is lower than the height of the high-temperature and high-humidity flue gas inlet.

[0014] Furthermore, a slot is opened on the fresh water collection plate, and a fresh water output nozzle is provided on the shell. Fresh water is collected at the fresh water output nozzle and collected into the fresh water storage tank through a pipeline.

[0015] The following beneficial effects can be obtained through the above technical solution:

[0016] The structure of the present invention is compact, and the desalination water device part can be made of non-metal to avoid metal acid corrosion. After the low-temperature saturated humid air reacts with the fuel, the dew point temperature of the flue gas is increased, and the quality of the low-temperature latent heat is improved, which is more conducive to latent heat recovery. At the same time, since the humid air reduces the oxygen concentration, the combustion of the humid air and the fuel can reduce the NO of the gas boiler. x The system utilizes the condensation latent heat of water vapor in the flue gas of the boiler, and the humidification and dehumidification are arranged in an integrated manner up and down, which speeds up the water output time of the system and improves the fresh water production efficiency of the system, thereby realizing the comprehensive utilization of flue gas latent heat recovery and seawater desalination. The system can be widely used on a large scale and at a low cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the system of the present invention.

[0018] In the figure:

[0019] In the figure: 1, shell; 2, flue gas dehumidification chamber; 3, evaporation-humidification chamber; 4, condensation-dehumidification chamber; 5, fresh water collection plate; 6, circulating gas channel; 7, annular seawater sprayer, 8, porous filler stacking bed, 9, immersed heat exchange coil, 10, condensation heat exchange coil, 11, low-temperature seawater sprayer, 12, boiler, 13, plate heat exchanger, 14, filter device I, 15, filter device II, 16, fan, 17, circulation pump I, 18, circulation pump II, 19, circulation pump III, 20, air valve, 21, flue gas inlet, 22, smoke exhaust port, 23, seawater collection port, 24, overflow pipe I, 25, overflow pipe II, 26, gas inlet, 27, gas outlet, 28, one-way air supply port, 29, fresh water output pipe port, 30, return water / water supply port, 31, hot water supply port. DETAILED DESCRIPTION

[0020] The present invention will be further described below in conjunction with the accompanying drawings:

[0021] like Figure 1As shown, a seawater dehumidification system utilizing flue gas latent heat humidification and dehumidification comprises a shell 1, wherein the interior of the shell 1 is divided into a condensation-dehumidification chamber 4 and an evaporation-humidification chamber 3 stacked on top and bottom, a fresh water collecting tray 5 is arranged in the middle, the condensation-dehumidification chamber 4 is provided with a coaxial flue gas dehumidification chamber 2, a low-temperature seawater sprayer 11 is installed on the top of the flue gas dehumidification chamber 2, the flue gas dehumidification chamber 2 is provided with a flue gas inlet 21, a smoke outlet 22, and a seawater collecting port 23, a condensation heat exchange coil 10 is arranged in the condensation-dehumidification chamber 4, an annular seawater sprayer 7 is arranged on the top of the evaporation-humidification chamber 3, and a porous filler stacking bed 8 is arranged on the bottom), an immersed heat exchange coil 9 is arranged at the bottom of the shell 1, a circulating gas channel 6 is arranged on the inner side of the shell 1, a wind valve of the circulating gas channel 6 is connected to the boiler, and a gas outlet 27 of the circulating gas channel 6 is arranged at the lower part of the evaporation-humidification chamber 3, so as to realize the communication between the condensation-dehumidification chamber 4 and the evaporation-humidification chamber 3;

[0022] The low-temperature and low-concentration seawater is connected to the condensing heat exchange coil 10 and the low-temperature seawater sprayer 11 respectively through the filtering device I14, the smoke exhaust end of the boiler 12 is connected to the smoke inlet 21, the return water / water supply port 30 and the hot water supply port 31 of the boiler 12 are respectively connected to the hot side inlet and outlet of the plate heat exchanger 13, the plate heat exchanger 13 is connected to the annular high-temperature seawater sprayer 7, the medium-temperature and low-concentration seawater flowing out of the smoke dehumidification chamber 2 is mixed with the seawater flowing out of the immersed heat exchange coil 9, and then connected to the cold side inlet of the plate heat exchanger 13 through the filtering device II15.

[0023] The low-temperature and low-concentration seawater is passed through the filtering device 114 and then pumped into the condensing heat exchange coil 10 and the low-temperature seawater sprayer 11 through the circulating pump 117.

[0024] A circulation pump II18 is installed between the filtering device II15 and the plate heat exchanger 13 .

[0025] A one-way gas supply port 28 is provided at the bottom of the circulating gas channel 6 , and the circulating gas channel 6 transports the gas to the gas outlet 27 through a branch pipe to enter the evaporation-humidification chamber 3 .

[0026] An overflow pipe I24 and an overflow pipe II25 are installed at the bottom of the shell 1 and the flue gas dehumidification chamber 2, which are used to control the liquid levels in the cylindrical shell 1 and the flue gas dehumidification chamber 2 respectively.

[0027] A fan 16 is installed at the gas inlet 26 of the circulating gas channel 6, and an electric regulating air valve is used at the air valve 20.

[0028] The height of the overflow pipe I24 is lower than the height of the gas outlet 27, and the height of the overflow pipe II25 is lower than the height of the high-temperature and high-humidity flue gas inlet 21.

[0029] The fresh water collecting plate 5 is provided with slots, and the housing 1 is provided with a fresh water outlet pipe 29 . Fresh water is collected at the fresh water outlet pipe 29 and collected into the fresh water storage tank through a pipeline. Example

[0030] A cylindrical shell is provided in the system, and a flue gas dehumidification chamber 2 is provided in the cylindrical shell. The cylindrical shell 1 and the flue gas dehumidification chamber 2 are coaxially arranged. A low-temperature seawater sprayer 11 is provided at the top of the flue gas dehumidification chamber 2. The distribution of the nozzles ensures that the liquid can be sprayed 360 degrees. A high-temperature and high-humidity flue gas inlet 21 is provided at the bottom of the flue gas dehumidification chamber 2, a low-temperature and saturated flue gas exhaust port 22 is provided at the top, and a medium-temperature and low-concentration seawater collection port 23 is provided at the bottom; the interior of the cylindrical shell is divided into upper and lower chambers by a fresh water collection tray 5, the lower layer is an evaporation-humidification chamber 3, and the upper layer is a condensation-dehumidification chamber 4; a condensation coil heat exchanger 10 is provided in the condensation-dehumidification chamber 4. An annular seawater sprayer 7 is provided at the top of the evaporation-humidification chamber 3, and a porous filler stacking bed 8 is provided at the bottom. There is a circulating gas channel 6 on the outside of the side of the cylindrical shell, and the gas inlet 26 of the circulating gas channel 6 is arranged at the upper part of the condensation-dehumidification chamber 4, and the gas outlet 27 is arranged at the lower part of the evaporation-humidification chamber 3. An immersed heat exchange coil 9 is arranged at the bottom of the cylindrical shell, and the liquid level here is higher than the immersed heat exchange coil 9 and lower than the gas outlet 27 of the circulating gas channel 6. An overflow pipe I24 and an overflow pipe II25 are respectively arranged at the bottom of the cylindrical shell and the flue gas dehumidification chamber 2. The height of the overflow pipe I24 is slightly lower than the height of the gas outlet 27, and the height of the overflow pipe II25 is slightly lower than the height of the high-temperature and high-humidity flue gas inlet 21.

[0031] The low-temperature, low-concentration seawater passes through the filter device I14 and the circulation pump I17 from the upper part of the cylindrical shell to the condensing coil heat exchanger 10 and the low-temperature seawater sprayer 11. The high-temperature, high-humidity boiler exhaust gas enters the flue gas dehumidification chamber 2 from the flue gas inlet 21. Inside the flue gas dehumidification chamber 2, the sprayed low-temperature, low-concentration seawater directly contacts the high-temperature boiler exhaust gas in countercurrent, and the exhaust gas temperature is reduced to become low-temperature saturated flue gas, and finally discharged from the exhaust port 22. The water vapor in the flue gas condenses and falls, and the low-temperature, low-concentration seawater absorbs the latent heat of condensation of water vapor to become medium-temperature, low-concentration seawater, and enters the filter device II15 through the seawater collection port 23 through the pipeline. In addition, in the condensation-dehumidification chamber 4, the high-temperature, high-humidity saturated air is condensed by the condensing coil heat exchanger 10, and the water vapor condenses into desalinated water, which is collected by the fresh water collection plate 5 and collected in the fresh water storage tank through the fresh water output pipe 29 for users to take. The seawater flowing out of the condensing coil heat exchanger 10 enters the immersed heat exchange coil 9 again to absorb heat, enters the filter device II15 through the pipeline, mixes with the medium-temperature low-concentration seawater, and enters the cold side inlet of the plate heat exchanger 13 through the circulating pump II18. The medium-temperature low-concentration seawater becomes high-temperature low-concentration seawater after heat exchange with the hot water supplied by the boiler 12 in the plate heat exchanger 13, and enters the annular high-temperature seawater sprayer 7. At the same time, the high-temperature and high-humidity saturated air becomes low-temperature and low-humidity saturated air, which is transported to the gas outlet 27 through the gas inlet 26 of the circulating gas channel 6 through the fan 16 and enters the evaporation-humidification chamber 3. In the evaporation-humidification chamber 3, the high-temperature and low-concentration seawater is sprayed on the porous filler accumulation bed 8 by the annular seawater sprayer 7, and the low-temperature and low-humidity saturated air is fully in contact with the high-temperature and low-concentration seawater on the porous filler, and the temperature and moisture content are increased, becoming high-temperature and high-humidity saturated air and entering the condensation-dehumidification chamber 4. In this cycle, fresh water can be obtained continuously.

[0032] In addition, an electric regulating air valve 20 is also provided on the upper part of the circulating gas channel 6 to control the opening of the electric regulating air valve 20. The low-temperature and low-humidity saturated air in the condensation-dehumidification chamber 4 can be transported to the air inlet of the boiler 12 through the fan 16 to be mixed with the fuel for combustion. The return water / water supply port 30 and the hot water supply port 31 of the boiler 12 are respectively connected to the hot side inlet and outlet of the plate heat exchanger 13. The medium water is heated by circulating through the circulating pump III19, and the heat is transferred to the medium-temperature and low-concentration seawater through the plate heat exchanger 13.

[0033] In the above embodiment: the boiler 12 is connected to the plate heat exchanger 13 to circulate and heat the medium water. After the saturated humid air and the hydrocarbon fuel are burned, the flue gas dew point temperature is increased, which is more conducive to heat recovery. At the same time, the humid air reduces the oxygen concentration, NO xThe flue gas duct of the boiler 12 is connected to the flue gas inlet 21 of the flue gas dehumidification chamber 2, and the flue gas inlet is at the bottom of the flue gas dehumidification chamber 2. The high-temperature and high-humidity flue gas generated by the combustion of the boiler 12 enters the flue gas dehumidification chamber 2 from the flue gas inlet, and directly exchanges heat with the low-temperature and low-concentration seawater sprayed by the low-temperature seawater sprayer 11 in the flue gas dehumidification chamber 2 in countercurrent contact. The low-temperature saturated flue gas after heat exchange and cooling is discharged from the exhaust port 22. After being heated, the low-temperature and low-concentration seawater is gathered at the bottom of the flue gas dehumidification chamber 2 to the medium-temperature and low-concentration seawater collection port 23.

[0034] In the above embodiment: the heat supplied by the boiler 12 in the plate heat exchanger 13 is transferred to the medium-temperature, low-concentration seawater through the medium water, and the medium-temperature, low-concentration seawater is heated to become high-temperature, low-concentration seawater. The high-temperature, low-concentration seawater enters the annular seawater sprayer 7 and is sprayed from top to bottom on the filler of the porous filler stacking bed 8 in the evaporation-humidification chamber 3. The humidification filler is easy to replace, hydrophilic and non-toxic, highly durable, and low in price. The porosity can increase the wetted surface area and thus improve the mass transfer coefficient of the stacking bed. After the low-temperature, low-humidity saturated air is fully in contact with the high-temperature, low-concentration seawater on the porous filler, the temperature rises, thereby increasing the ability to carry water vapor, and the air moisture content increases, becoming high-temperature, high-humidity saturated air and entering the condensation-dehumidification chamber 4 through the fresh water collection tray 5. The fresh water collection tray 5 is grooved to facilitate the passage of high-temperature, high-humidity saturated air, and can prevent the condensed fresh water in the condensation-dehumidification chamber 4 from falling into the evaporation-humidification chamber 3. The condensing coil heat exchanger 10 in the condensation-dehumidification chamber 4 is filled with low-temperature, low-concentration seawater, and the high-temperature, high-humidity saturated air is condensed, and the water vapor is condensed into fresh water, which is collected by the fresh water collection tray 5 and collected into the fresh water storage tank through the fresh water output pipe port 29 for users to take.

[0035] In the above embodiment: after the high-temperature and high-humidity saturated air is condensed, it becomes low-temperature and low-humidity saturated air, which is transported to the gas outlet 27 through the gas inlet 26 of the circulating gas channel 6 through the fan 16 and enters the evaporation-humidification chamber 3. The gas circulates back and forth, and is dehumidified after humidification, so that fresh water is obtained continuously. At the same time, an electric regulating air valve 20 is also provided on the upper part of the circulating gas channel 6 to control the opening of the electric regulating air valve 20. The low-temperature and low-humidity saturated air in the condensation-dehumidification chamber 4 can be transported to the air inlet of the boiler 12 through the fan 16 to be mixed and burned with hydrocarbon fuel. In order to make up for the wet air consumed by the mixed combustion, a one-way air supply port 28 is provided at the bottom of the circulating gas channel 6. The air outside the system can enter the condensation-dehumidification chamber 4 through this one-way air supply port 28, and the wet air in the condensation-dehumidification chamber 4 cannot be discharged from the system through this one-way air supply port 28.

[0036] In order to further utilize the temperature gradient of the combustion heat, a space is reserved at the bottom of the evaporation-humidification chamber 3, in which an immersed heat exchange coil 9 is arranged. Some seawater with a higher temperature is stored in this space, and the height of the seawater liquid level is lower than the gas outlet 27 of the circulating gas channel 6, and higher than the immersed heat exchange coil 9. On the one hand, the circulation of the humid air is ensured to be smooth, and on the other hand, the seawater flowing out of the condensing coil heat exchanger 10 further exchanges heat with the seawater with a higher temperature in the immersed heat exchange coil 9, thereby making full use of the temperature gradient. The seawater flowing out of the immersed heat exchange coil 9 is mixed with the medium-temperature low-concentration seawater discharged from the seawater collection port 23 at the bottom of the flue gas dehumidification chamber 2 after being filtered by the filter device II15, and is pumped into the plate heat exchanger 13 by the circulation pump II18 for heat exchange.

[0037] Due to the condensation of water vapor in the flue gas and the low-temperature, low-concentration seawater entering from the filter device I14, the flow rate of the circulating seawater may increase, that is, the amount of seawater generated in the flue gas dehumidification chamber 2 plus the amount of seawater input is greater than the amount of seawater remaining after evaporation and condensation to produce fresh water. Therefore, a part of the circulating seawater needs to be discharged to maintain a steady state, which is conducive to the continuous recovery and utilization of flue gas latent heat. Therefore, an overflow pipe I24 and an overflow pipe II25 are respectively provided at the bottom of the cylindrical shell 1 and the flue gas dehumidification chamber 2. On the one hand, the excess seawater is collected through the overflow pipe and discharged outside the system. On the other hand, the mouth of the overflow pipe I24 is slightly lower than the gas outlet 27, thereby ensuring smooth circulation of the circulating humid air, and the mouth of the overflow pipe II25 is slightly lower than the high-temperature and high-humidity flue gas inlet 21, thereby ensuring smooth circulation of the boiler exhaust flue gas.

[0038] Based on the above embodiments, the cylindrical shell and the flue gas dehumidification chamber may not be coaxial; or the flue gas dehumidification chamber serves as the cylindrical shell, and the evaporation-humidification chamber and the condensation-dehumidification chamber are inside it. As long as they can perform the same function, the specific structural relationship can be changed according to actual needs.

[0039] In summary, the comprehensive utilization system that uses the latent heat of boiler exhaust gas to produce fresh water from seawater or brackish water can reduce the emission of boiler pollutants while obtaining fresh water.

[0040] The above are all preferred embodiments of the present invention. For ordinary technicians in this technical field, without departing from the principle of the present invention, various equivalent modifications to the present invention belong to the protection scope of the claims attached to this application.

Claims

1. A seawater dehumidification system utilizing flue gas latent heat for humidification and dehumidification, comprising a housing (1), characterized in that: The shell (1) is internally divided into a condensation-dehumidification chamber (4) and an evaporation-humidification chamber (3) which are stacked on top of each other, with a fresh water collection tray (5) arranged in the middle. The condensation-dehumidification chamber (4) is provided with a flue gas dehumidification chamber (2). A low-temperature seawater sprayer (11) is installed at the top of the flue gas dehumidification chamber (2). The flue gas dehumidification chamber (2) is provided with a flue gas inlet (21), a smoke outlet (22), and a seawater collection port (23). The condensation-dehumidification chamber (4) is provided with a condensation heat exchange coil (10). The evaporation-humidification chamber (3) is provided with an annular seawater sprayer (7) at the top and a porous filler stacking bed (8) at the bottom. An immersed heat exchange coil (9) is arranged at the bottom of the shell (1). A circulating gas channel (6) is provided on the inner side of the shell (1). The air valve of the circulating gas channel (6) is connected to the boiler. The gas outlet (27) of the circulating gas channel (6) is arranged at the bottom of the evaporation-humidification chamber (3), so as to realize the communication between the condensation-dehumidification chamber (4) and the evaporation-humidification chamber (3). The low-temperature, low-concentration seawater is connected to the condensing heat exchange coil (10) and the low-temperature seawater sprayer (11) respectively through the filter device I (14); the smoke exhaust end of the boiler (12) is connected to the smoke inlet (21); the return water / water supply port (30) and the hot water supply port (31) of the boiler (12) are connected to the hot side inlet and outlet of the plate heat exchanger (13) respectively; the plate heat exchanger (13) is connected to the annular high-temperature seawater sprayer (7); the medium-temperature, low-concentration seawater flowing out of the smoke dehumidification chamber (2) is mixed with the seawater flowing out of the immersed heat exchange coil (9) and then connected to the cold side inlet of the plate heat exchanger (13) through the filter device II (15); A one-way gas supply port (28) is provided at the bottom of the circulating gas channel (6), and the circulating gas channel (6) transports gas to the gas outlet (27) through a branch pipe to enter the evaporation-humidification chamber (3).

2. A seawater dehumidification system utilizing flue gas latent heat humidification and dehumidification according to claim 1, characterized in that: The low-temperature, low-concentration seawater passes through a filtering device I (14) and is then pumped into a condensing heat exchange coil (10) and a low-temperature seawater sprayer (11) via a circulating pump I (17).

3. The seawater desalination system utilizing flue gas latent heat for humidification and dehumidification according to claim 1, characterized in that: A circulation pump II (18) is installed between the filtering device II (15) and the plate heat exchanger (13).

4. The seawater desalination system utilizing flue gas latent heat for humidification and dehumidification according to claim 1, characterized in that: An overflow pipe I (24) and an overflow pipe II (25) are installed at the bottom of the shell (1) and the flue gas dehumidification chamber (2), and are used to control the liquid levels in the cylindrical shell (1) and the flue gas dehumidification chamber (2), respectively.

5. A seawater dehumidification system utilizing flue gas latent heat for humidification and dehumidification according to claim 4, characterized in that: A fan (16) is installed at the gas inlet (26) of the circulating gas channel (6), and an electric regulating air valve is used on the air valve (20).

6. The seawater desalination system utilizing flue gas latent heat for humidification and dehumidification according to claim 1, characterized in that: The height of the overflow pipe I (24) is lower than the height of the gas outlet (27), and the height of the overflow pipe II (25) is lower than the height of the high-temperature and high-humidity flue gas inlet (21).

7. The seawater desalination system utilizing flue gas latent heat for humidification and dehumidification according to claim 1, characterized in that: The fresh water collecting plate (5) is provided with slotted holes, and the shell (1) is provided with a fresh water output pipe opening (29). Fresh water is collected at the fresh water output pipe opening (29) and collected into a fresh water storage tank through a pipeline.

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