A method and system for comprehensive recovery and utilization of waste heat and water from dehumidified airflow

Abstract

This invention relates to a method and system for the comprehensive recovery and utilization of waste heat and water from exhaust airflow, belonging to the field of hot air drying technology. The invention uses water as both the heat transfer medium and the moisture absorption medium, and incorporates an exhaust airflow heat and moisture recovery unit and a water-air separator. In the exhaust airflow heat and moisture recovery unit, the exhaust airflow is directly and uniformly cooled and dehumidified by the heat transfer medium, releasing heat and condensing into water. The condensate from the exhaust airflow and the water separated in the water-air separator are collected in a collection tank through a collection pipe for recovery; the heat transfer medium exchanges heat with the heat transfer medium through a partition wall heat exchanger for waste heat recovery. The exhaust airflow waste heat and water comprehensive recovery and utilization system using this method consists of an exhaust airflow heat and moisture recovery unit, a water-air separator and partition wall heat exchanger, a circulating pump, and an exhaust fan. This system can simultaneously and efficiently recover and utilize the waste heat and water from the exhaust airflow at low cost, offering advantages such as energy saving, water saving, and high heat and moisture recovery and utilization rate.

Description

Technical Field

[0001] This invention relates to a method and system for the comprehensive recovery and utilization of waste heat and water from dehumidified airflow, belonging to the field of hot air drying technology. Background Technology

[0002] Hot air drying of agricultural products and industrial materials is an energy-intensive operation. Energy consumption is even higher when the initial moisture content of the material is high, the hot air temperature is high, and the amount of water to be removed is large. During drying operations, the temperature of the exhaust airflow is mostly below 150℃. Directly recovering and utilizing the residual heat is costly due to the small temperature difference required and the large heat exchange area. Therefore, the exhaust airflow is often directly discharged outdoors. Because the high-temperature, high-humidity exhaust airflow carries a large amount of residual heat and water vapor, direct discharge outdoors results in significant loss of low-temperature residual heat and waste of water.

[0003] Currently, for the recovery and utilization of low-grade waste heat from exhaust airflow, heat exchangers are often used to heat the heat medium to the required temperature using the exhaust airflow, but the heat exchange temperature difference is usually small. Furthermore, due to the low thermal conductivity of the exhaust airflow, its heat exchange performance is poor. Therefore, using heat exchangers to heat the heat medium from the exhaust airflow not only results in low waste heat recovery efficiency but also high waste heat recovery costs. This, to some extent, limits the recovery and utilization of waste heat from exhaust airflow.

[0004] Furthermore, the exhaust airflow has a high relative humidity and high water content. Currently, none of the waste heat recovery devices for exhaust airflow recover and utilize the water carried in the exhaust airflow. Directly discharging the exhaust airflow outdoors or only recovering the waste heat from the exhaust airflow both result in water waste.

[0005] Therefore, under the dual carbon objectives, in order to improve the energy efficiency of hot air drying and reduce carbon emissions and water consumption, it is of great application value and broad application prospects to seek new, highly efficient, and low-cost methods and devices for the comprehensive recovery and utilization of waste heat and water from exhaust airflow. Summary of the Invention

[0006] The technical problem to be solved by the present invention is: the present invention provides a method and system for comprehensive recovery and utilization of waste heat and water in exhaust airflow, which can reduce heat transfer resistance, reduce mass transfer resistance, increase heat transfer coefficient and mass transfer coefficient, and effectively recover waste heat and water carried in exhaust airflow, and improve the recovery and utilization rate of waste heat and water in exhaust airflow.

[0007] The technical solution of this invention is as follows: This invention provides a method for the comprehensive recovery and utilization of waste heat and water from exhaust airflow. The method includes: setting up a partition heat exchanger 1, an exhaust airflow heat and moisture recovery device 3, and a water-air separator 15; the exhaust airflow heat and moisture recovery device 3 uses water as a heat transfer medium (absorbing heat from the exhaust airflow and releasing heat to the heat transfer medium), and the heat transfer medium also serves as a moisture absorption medium (absorbing the condensate that precipitates from the exhaust airflow due to cooling). The exhaust airflow and the heat transfer medium directly contact each other for heat and moisture exchange, reducing heat transfer resistance, reducing mass transfer resistance, and increasing the heat transfer coefficient and mass transfer coefficient; the exhaust airflow is evenly dispersed by the perforated plate 302 set in the exhaust airflow heat and moisture recovery device 3 to increase the contact area between the exhaust airflow and the heat transfer medium, further increasing the heat transfer coefficient and mass transfer coefficient. The exhaust airflow is directly and uniformly cooled by the heat transfer medium in the exhaust airflow heat and moisture recovery unit 3. The heat transfer medium cools the exhaust airflow to below its saturation temperature, releasing heat and condensing to remove moisture, producing condensate which is released into the heat transfer medium. The condensate from the exhaust airflow and the water separated in the water-air separator 15 sequentially pass through the water collection pipe 13, sedimentation tank 17, overflow pipe 18, and filter 21 into the water collection tank 9 for recovery. A flow guide baffle is installed in the exhaust airflow heat and moisture recovery unit 3 to enhance the heat and moisture exchange between the exhaust airflow and the heat transfer medium, prolonging the heat and moisture exchange time and improving the recovery rate of waste heat and water in the exhaust airflow. The heat transfer medium flows through the partition heat exchanger 1 under the traction of the circulating pump 2, exchanging heat with the heat medium to heat it for direct use by the user or as a low-temperature heat source for other heat energy supply systems, thus realizing the recovery of waste heat from the exhaust airflow.

[0008] Drawn by the exhaust fan 5, the exhaust airflow enters the exhaust airflow heat and moisture recovery unit 3 from the bottom, directly contacting the heat transfer medium for heat and moisture exchange. The exhaust airflow, after being fully cooled and dehumidified (carrying a certain amount of tiny water droplets), flows out from the top of the exhaust airflow heat and moisture recovery unit 3 and enters the water-air separator 15 for water-air separation before being discharged into the atmosphere. The condensate from the hot and humid airflow in the exhaust airflow heat and moisture recovery unit 3 and the water separated in the water-air separator 15 are collected through the water collection pipe 13, and after sedimentation and filtration, enter the water collection tank 9 for user use, thus realizing the recovery of water from the exhaust airflow.

[0009] Furthermore, under the action of the circulating pump 2, the heat transfer medium enters the exhaust airflow heat and moisture recovery unit 3 from the circulating water inlet 304 at the bottom of the exhaust airflow heat and moisture recovery unit 3, absorbs the waste heat of the exhaust airflow, and its temperature gradually increases. Then, it flows out from the circulating water outlet 309 at the top of the exhaust airflow heat and moisture recovery unit 3. The heat transfer medium, whose temperature gradually increases, generates a vertically upward thermosiphon head, which is consistent with the head of the circulating pump 2, so as to increase the flow rate of the circulating pump 2 and reduce its power consumption. The condensate precipitated from the exhaust airflow enters the sedimentation tank 17 through the condensate outlet 306 at the bottom of the exhaust airflow heat and moisture recovery unit 3 and the water collection pipe 13, and then enters the water collection tank 9 through the overflow pipe 18 and the filter 21 to recover the water in the exhaust airflow.

[0010] Furthermore, the air distribution plate 302 is located at the lower part of the exhaust airflow heat and moisture recovery device 3, and a plurality of air distribution holes 3012 are evenly arranged on the air distribution plate 302; along the direction of the exhaust airflow, the diameter of the holes gradually increases, so that the exhaust airflow is evenly dispersed and fully contacts the heat transfer medium, thereby improving the heat and moisture recovery efficiency.

[0011] Furthermore, several guide baffles 301 are arranged alternately on the top of the air distribution perforated plate 302; the exhaust airflow enters the exhaust airflow heat and moisture recovery unit 3 from the exhaust airflow inlet 303 at the bottom of the exhaust airflow heat and moisture recovery unit 3, first flows through the air distribution perforated plate 302, then flows through the flow channels formed by the guide baffles 301, and then enters the water-air separator 15 through the exhaust airflow outlet 308 located at the top of the exhaust airflow heat and moisture recovery unit 3; while the exhaust airflow is flowing, it fully exchanges heat and moisture with the heat transfer medium; the flow direction of the exhaust airflow is the same as the flow direction of the heat transfer medium, so as to reduce the power consumption of the exhaust fan and avoid blockage of the exhaust airflow.

[0012] The present invention also provides a comprehensive system for the recovery and utilization of waste heat and water from dehumidified airflow. The system includes a dehumidified airflow heat and moisture recovery unit 3, a partition wall heat exchanger 1, a water-air separator 15, a dehumidified fan 5, a circulating pump 2, a circulating water pipe 6, and a dehumidified air duct 4. The dehumidified airflow from the drying chamber, under the action of the dehumidified fan 5, enters the dehumidified airflow heat and moisture recovery unit 3 from the dehumidified airflow inlet 303 through the dehumidified airflow duct 4. After sufficient heat and moisture exchange with the heat transfer medium, it enters the water-air separator 15 from the dehumidified airflow outlet 308 of the dehumidified airflow heat and moisture recovery unit 3 through the air outlet pipe 14, and then is discharged into the atmosphere through the exhaust pipe 16. One end of the water collection pipe 13 is connected to the water-air separator 15, and the other end is connected to the sedimentation tank 17; one end of the condensate outlet pipe 10 is connected to the condensate outlet 306 of the dehumidification airflow heat and humidity recovery unit 3, and the other end is connected to the middle of the water collection pipe 13, which is then connected to the water-air separator 15; the suction end of the circulating pump 2 is connected to the circulating water outlet 309 of the dehumidification airflow heat and humidity recovery unit 3 through the circulating water pipe 6, and the discharge end of the circulating pump 2 is connected to the water-side inlet of the partition wall heat exchanger 1 through the circulating water pipe 6; the water-side outlet of the partition wall heat exchanger 1 is connected to the circulating water inlet 304 of the dehumidification airflow heat and humidity recovery unit 3 through the circulating water pipe 6.

[0013] Furthermore, it also includes a sedimentation tank 17, an overflow pipe 18, a filter 21, a water collection tank 9, a drain pipe 7 for the dehumidification airflow heat and humidity recovery unit, a drain valve 8 for the dehumidification airflow heat and humidity recovery unit, a drain valve 19 for the sedimentation tank, and a drain pipe 20 for the sedimentation tank; the water collection pipe 13, which is connected to the condensate outlet pipe 10, is also connected in sequence to the sedimentation tank 17, the overflow pipe 18, the filter 21, and the water collection tank 9. The condensate from the dehumidification airflow and the water separated in the water-air separator 15 enter the water collection tank 9 in sequence through the water collection pipe 13, the sedimentation tank 17, the overflow pipe 18, and the filter 21; the lower part of the sedimentation tank 17 is connected to the sedimentation tank drain pipe 20 through the sedimentation tank drain valve 19, and the water-air separator 15 is equipped with an exhaust pipe 16.

[0014] Furthermore, the dehumidification airflow heat and humidity recovery device 3 includes a flow guide baffle 301, an air distribution perforated plate 302, a dehumidification airflow inlet 303, a circulating water inlet 304, a drain outlet 305, a condensate outlet 306, a water filling port 307, a dehumidification airflow outlet 308, a circulating water outlet 309, a metal shell 3010, a heat insulation layer 3011, and air distribution holes 3012;

[0015] The dehumidification airflow heat and moisture recovery unit 3 has a circulating water inlet 304 and a drain outlet 305 at its bottom. A water filling port 307 is located on the upper left side of the unit, and a circulating water outlet 309 is located on the right side. The circulating water outlet 309 is connected to the partition heat exchanger 1 via a circulating pump 2. A water filling pipe 11 is connected to the water filling port 307, and a water filling valve 12 is installed on the water filling pipe 11. A dehumidification airflow outlet 308 is located at the top of the unit. The dehumidification airflow inlet 303, condensate outlet 306, and dehumidification airflow outlet 308 are respectively connected to the dehumidification duct 4, condensate outlet pipe 10, and air outlet pipe 14. Then, the air outlet duct 14 is connected to the water-air separator 15; the air distribution plate 302 is located at the lower part of the exhaust airflow heat and moisture recovery unit 3, and air distribution holes 3012 are evenly arranged on the air distribution plate 302. The diameter of the holes gradually increases along the direction of the exhaust airflow, so that the exhaust airflow is evenly dispersed and fully contacts the heat transfer medium to improve the heat and moisture recovery efficiency; on the top of the air distribution plate 302, several flow guide baffles 301 are arranged alternately. The metal shell 3010 of the air distribution plate 302 is made of stainless steel, and the outside of the metal shell 3010 is provided with a heat insulation layer 3011, which is made of polyurethane. The exhaust airflow enters the exhaust airflow heat and moisture recovery unit 3 from the lower exhaust airflow inlet 303, first flows through the air distribution perforated plate 302, then flows through the flow channel formed by the guide baffle 301, and then enters the water-air separator 15 through the exhaust airflow outlet 308 located at the upper part of the exhaust airflow heat and moisture recovery unit 3. While the exhaust airflow is flowing, it fully exchanges heat and moisture with the heat transfer medium. The flow direction of the exhaust airflow is the same as the flow direction of the heat transfer medium to reduce the power consumption of the exhaust fan and avoid blockage of the exhaust airflow. Under the action of the circulating pump 2, the heat transfer medium enters the exhaust airflow heat and moisture recovery unit 3 from the lower circulating water inlet, absorbs the waste heat of the exhaust airflow, and its temperature gradually increases. Then it flows out from the upper circulating water outlet 309. The heat transfer medium, whose temperature gradually increases, generates a vertically upward thermosiphon head, which is consistent with the head of the circulating pump 2, so as to increase the flow rate of the circulating pump 2 and reduce its power consumption. The condensate precipitated from the exhaust airflow enters the sedimentation tank 17 through the condensate outlet 306, condensate outlet pipe 10, and water collection pipe 13 at the bottom of the exhaust airflow heat and moisture recovery unit 3, and then enters the water collection tank 9 through the overflow pipe 18 and filter 21 to recover the water in the exhaust airflow.

[0016] Furthermore, the bottom of the dehumidification airflow heat and moisture recovery unit 3 is also provided with a dehumidification airflow heat and moisture recovery unit drain pipe 7 and a dehumidification airflow heat and moisture recovery unit drain valve 8. The dehumidification airflow heat and moisture recovery unit drain pipe 7 is connected to the drain port 305 at the bottom of the dehumidification airflow heat and moisture recovery unit 3, and the dehumidification airflow heat and moisture recovery unit drain valve 8 is provided on the dehumidification airflow heat and moisture recovery unit drain pipe 7.

[0017] The exhaust duct 16 is inserted from the upper part of the water-air separator 15 to the lower part of the water-air separator 15, and the outlet duct 14 extends from the lower part of the water-air separator 15 to the upper part of the water-air separator 15. After being sufficiently cooled and dehumidified, the exhaust airflow carrying a certain amount of tiny water droplets enters the water-air separator 15 from bottom to top through the outlet duct 14, and then enters the exhaust duct 16 from top to bottom. In the water-air separator 15, water-air separation is achieved by utilizing the change in the exhaust airflow velocity and the density difference between air and water droplets. The separated water droplets enter the sedimentation tank 17 from the lower part of the water-air separator 15 through the water collection pipe 13.

[0018] The beneficial effects of this invention are as follows: This invention incorporates a dehumidifying airflow heat and moisture recovery device, using water as the heat transfer medium. The dehumidifying airflow directly contacts the water for heat and moisture exchange, effectively reducing heat transfer resistance and mass transfer resistance, increasing the heat transfer coefficient and mass transfer coefficient, and simultaneously recovering the waste heat and water from the dehumidifying airflow at low cost. A variable-aperture perforated plate is incorporated into the dehumidifying airflow heat and moisture recovery device to evenly disperse the dehumidifying airflow, increasing the contact area between the dehumidifying airflow and the heat transfer medium, further reducing heat transfer resistance and mass transfer resistance, and increasing the heat transfer coefficient and mass transfer coefficient. A flow guide baffle is also incorporated into the dehumidifying airflow heat and moisture recovery device to further enhance the heat and moisture exchange between the dehumidifying airflow and the heat transfer medium, and extend the heat and moisture exchange time, thereby improving the recovery and utilization rate of waste heat and water in the dehumidifying airflow. The comprehensive dehumidifying air waste heat and water recovery and utilization system of this invention has the advantages of energy saving, water saving, and high heat and moisture recovery and utilization rate. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the composition of the exhaust airflow waste heat and water comprehensive recovery and utilization system of the present invention;

[0020] Figure 2 This is a schematic diagram of the structure of the dehumidification airflow heat and moisture recovery unit;

[0021] Figure 3 This is a cross-sectional view of the dehumidification airflow heat and moisture recovery unit.

[0022] Figure 1 The numbers in the diagram represent the following components in sequence: 1-Insulated heat exchanger, 2-Circulating pump, 3-Dehumidifying airflow heat and moisture recovery unit, 4-Dehumidifying air duct, 5-Dehumidifying fan, 6-Circulating water pipe, 7-Dehumidifying airflow heat and moisture recovery unit drain pipe, 8-Dehumidifying airflow heat and moisture recovery unit drain valve, 9-Water collection tank, 10-Condensate outlet pipe, 11-Water filling pipe, 12-Water filling valve, 13-Water collection pipe, 14-Air outlet pipe, 15-Water-air separator, 16-Exhaust pipe, 17-Sedimentation tank, 18-Overflow pipe, 19-Sedimentation tank drain valve, 20-Sedimentation tank drain pipe, 21-Filter.

[0023] Figure 2The numbers in the diagram represent the following in order: 301-flow guide plate, 302-air distribution plate, 303-damp airflow inlet, 304-circulating water inlet, 305-sewage outlet, 306-condensate outlet, 307-water filling port, 308-damp airflow outlet, and 309-circulating water outlet.

[0024] Figure 3 The numbers in the diagram represent, in order: 3010 - metal casing, 3011 - insulation layer, 3012 - air distribution holes. Detailed Implementation

[0025] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0026] Example 1: As Figures 1-3 As shown, this invention provides a method for the comprehensive recovery and utilization of waste heat and water from exhaust airflow. The method includes: setting up a partitioned heat exchanger 1, an exhaust airflow heat and moisture recovery device 3, and a water-air separator 15; the exhaust airflow heat and moisture recovery device 3 uses water as both the heat transfer medium and the moisture absorption medium, and the exhaust airflow directly contacts the heat transfer medium for heat and moisture exchange. The exhaust airflow is evenly dispersed by the perforated plate 302 in the exhaust airflow heat and moisture recovery device 3; the exhaust airflow is directly and evenly cooled by the heat transfer medium in the exhaust airflow heat and moisture recovery device 3, condensing and dehumidifying, releasing heat, and simultaneously precipitating condensate; the condensate precipitated from the exhaust airflow and the water separated in the water-air separator 15 sequentially enter the water collection tank 9 for recovery through the water collection pipe 13, sedimentation tank 17, overflow pipe 18, and filter 21; the heat transfer medium exchanges heat with the heat medium in the partitioned heat exchanger 1 to recover waste heat.

[0027] Furthermore, under the action of the circulating pump 2, the heat transfer medium enters the exhaust airflow heat and moisture recovery unit 3 from the circulating water inlet 304 at the bottom of the exhaust airflow heat and moisture recovery unit 3, absorbs the waste heat of the exhaust airflow, and its temperature gradually increases. Then, it flows out from the circulating water outlet 309 at the top of the exhaust airflow heat and moisture recovery unit 3. The heat transfer medium, whose temperature gradually increases, generates a vertically upward thermosiphon head, which is consistent with the head of the circulating pump 2, so as to increase the flow rate of the circulating pump 2 and reduce its power consumption. The condensate precipitated from the exhaust airflow enters the sedimentation tank 17 through the condensate outlet 306 at the bottom of the exhaust airflow heat and moisture recovery unit 3 and the water collection pipe 13, and then enters the water collection tank 9 through the overflow pipe 18 and the filter 21 to recover the water in the exhaust airflow.

[0028] Furthermore, the air distribution plate 302 is located at the lower part of the exhaust airflow heat and moisture recovery device 3, and a plurality of air distribution holes 3012 are evenly arranged on the air distribution plate 302; along the direction of the exhaust airflow, the diameter of the holes gradually increases, so that the exhaust airflow is evenly dispersed and fully contacts the heat transfer medium, thereby improving the heat and moisture recovery efficiency.

[0029] Furthermore, several guide baffles 301 are arranged alternately on the top of the air distribution perforated plate 302; the exhaust airflow enters the exhaust airflow heat and moisture recovery unit 3 from the exhaust airflow inlet 303 at the bottom of the exhaust airflow heat and moisture recovery unit 3, first flows through the air distribution perforated plate 302, then flows through the flow channels formed by the guide baffles 301, and then enters the water-air separator 15 through the exhaust airflow outlet 308 located at the top of the exhaust airflow heat and moisture recovery unit 3; while the exhaust airflow is flowing, it fully exchanges heat and moisture with the heat transfer medium; the flow direction of the exhaust airflow is the same as the flow direction of the heat transfer medium, so as to reduce the power consumption of the exhaust fan and avoid blockage of the exhaust airflow.

[0030] This invention also provides a comprehensive system for the recovery and utilization of waste heat and water from exhaust airflow. The system includes an exhaust airflow heat and moisture recovery unit 3, a partition wall heat exchanger 1, a water-air separator 15, an exhaust fan 5, a circulating pump 2, a circulating water pipe 6, and an exhaust air duct 4. Exhaust airflow from the drying chamber, under the action of the exhaust fan 5, enters the exhaust airflow heat and moisture recovery unit 3 through the exhaust air duct 4 from the exhaust airflow inlet 303. One end of the condensate outlet pipe 10 is connected to the exhaust airflow heat and moisture recovery unit. The condensate outlet 306 of the wet recovery unit 3 is connected to the other end, which is connected to the middle of the water collection pipe 13. The water collection pipe 13 is then connected to the water-air separator 15. The suction end of the circulating pump 2 is connected to the circulating water outlet 309 of the exhaust airflow heat and moisture recovery unit 3 through the circulating water pipe 6. The discharge end of the circulating pump 2 is connected to the water-side inlet of the partition wall heat exchanger 1 through the circulating water pipe 6. The water-side outlet of the partition wall heat exchanger 1 is connected to the circulating water inlet 304 of the exhaust airflow heat and moisture recovery unit 3 through the circulating water pipe 6.

[0031] Furthermore, it also includes a sedimentation tank 17, an overflow pipe 18, a filter 21, a water collection tank 9, a drain pipe 7 for the dehumidification airflow heat and humidity recovery unit, a drain valve 8 for the dehumidification airflow heat and humidity recovery unit, a drain valve 19 for the sedimentation tank, and a drain pipe 20 for the sedimentation tank; the water collection pipe 13, which is connected to the condensate outlet pipe 10, is also connected in sequence to the sedimentation tank 17, the overflow pipe 18, the filter 21, and the water collection tank 9. The condensate from the dehumidification airflow and the water separated in the water-air separator 15 enter the water collection tank 9 in sequence through the water collection pipe 13, the sedimentation tank 17, the overflow pipe 18, and the filter 21; the lower part of the sedimentation tank 17 is connected to the sedimentation tank drain pipe 20 through the sedimentation tank drain valve 19, and the water-air separator 15 is equipped with an exhaust pipe 16.

[0032] Furthermore, the dehumidification airflow heat and humidity recovery device 3 includes a flow guide baffle 301, an air distribution perforated plate 302, a dehumidification airflow inlet 303, a circulating water inlet 304, a drain outlet 305, a condensate outlet 306, a water filling port 307, a dehumidification airflow outlet 308, a circulating water outlet 309, a metal shell 3010, a heat insulation layer 3011, and air distribution holes 3012;

[0033] The dehumidification airflow heat and moisture recovery unit 3 has a circulating water inlet 304 and a drain outlet 305 at its bottom. A water filling port 307 is located on the upper left side of the unit, and a circulating water outlet 309 is located on the right side. The circulating water outlet 309 is connected to the partition heat exchanger 1 via a circulating pump 2. A water filling pipe 11 is connected to the water filling port 307, and a water filling valve 12 is installed on the water filling pipe 11. A dehumidification airflow outlet 308 is located at the top of the unit. The dehumidification airflow inlet 303, condensate outlet 306, and dehumidification airflow outlet 308 are respectively connected to the dehumidification duct 4, condensate outlet pipe 10, and air outlet pipe 14. Then, the air outlet duct 14 is connected to the water-air separator 15; the air distribution plate 302 is located at the lower part of the exhaust airflow heat and moisture recovery unit 3, and air distribution holes 3012 are evenly arranged on the air distribution plate 302. The diameter of the holes gradually increases along the direction of the exhaust airflow, so that the exhaust airflow is evenly dispersed and fully contacts the heat transfer medium to improve the heat and moisture recovery efficiency; on the top of the air distribution plate 302, several flow guide baffles 301 are arranged alternately. The metal shell 3010 of the air distribution plate 302 is made of stainless steel, and the outside of the metal shell 3010 is provided with a heat insulation layer 3011, which is made of polyurethane.

[0034] Furthermore, the bottom of the dehumidification airflow heat and moisture recovery unit 3 is also provided with a dehumidification airflow heat and moisture recovery unit drain pipe 7 and a dehumidification airflow heat and moisture recovery unit drain valve 8. The dehumidification airflow heat and moisture recovery unit drain pipe 7 is connected to the drain port 305 at the bottom of the dehumidification airflow heat and moisture recovery unit 3, and the dehumidification airflow heat and moisture recovery unit drain valve 8 is provided on the dehumidification airflow heat and moisture recovery unit drain pipe 7.

[0035] When this invention is used for the first time, the water filling valve 12 is opened, and a certain amount of softened water is filled into the exhaust airflow heat and moisture recovery unit 3 through the water filling pipe 11 and the water filling port 307, which is used as the heat transfer medium. The heat transfer medium of the indirect heat exchanger is tap water. The heat transfer medium is drawn by the circulating pump 2 through the indirect heat exchanger 1 and exchanges heat with the tap water to heat the tap water and provide domestic hot water to users; or it can be used as a low-temperature heat source for the water source heat pump to improve the heating performance of the water source heat pump, thereby realizing the waste heat recovery of the exhaust airflow.

[0036] Drawn by the dehumidifying fan 5, the dehumidifying airflow enters the dehumidifying airflow heat and moisture recovery unit 3 through the dehumidifying airflow inlet 303, and flows sequentially through the flow channel formed by the air distribution perforated plate 302 and the guide baffle 301. After being fully cooled and dehumidified, the dehumidifying airflow (carrying a certain amount of tiny water droplets) flowing out from the dehumidifying airflow outlet 308 enters the water-air separator 15 for water-air separation, and is then discharged into the atmosphere. The liquid water separated in the water-air separator 15 enters the water collection pipe 9. The condensate precipitated from the dehumidifying airflow in the dehumidifying airflow heat and moisture recovery unit 3 enters the water collection pipe 9 through the condensate outlet 306 and the condensate outlet pipe 10 of the dehumidifying airflow heat and moisture recovery unit 3. Then, together with the water separated in the water-air separator 15, it enters the sedimentation tank 17. The water that has settled in the sedimentation tank 17 enters the filter 21 through the overflow pipe 18, and then enters the water collection tank 9 for user use, realizing the recovery of water in the dehumidifying airflow.

[0037] The specific embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

Claims

1. A method for comprehensive recovery and utilization of waste heat and water from dehumidified airflow, characterized in that, The method includes: setting up a partition heat exchanger (1), a dehumidified airflow heat and moisture recovery device (3), and a water-gas separator (15); the dehumidified airflow heat and moisture recovery device (3) uses water as the heat transfer medium and the moisture absorption medium, and the dehumidified airflow directly contacts the heat transfer medium for heat and moisture exchange. The dehumidified airflow is evenly dispersed by the air distribution perforated plate (302) in the dehumidified airflow heat and moisture recovery device (3); the dehumidified airflow is directly and evenly cooled by the heat transfer medium in the dehumidified airflow heat and moisture recovery device (3), condenses and dehumidifies, releases heat, and precipitates condensate at the same time; the condensate precipitated by the dehumidified airflow and the water separated in the water-gas separator (15) pass through the water collection pipe (13), sedimentation tank (17), overflow pipe (18), and filter (21) in sequence into the water collection tank (9) for recovery; the heat transfer medium exchanges heat with the heat medium through the partition heat exchanger (1) to recover waste heat; The perforated plate (302) is located at the lower part of the exhaust airflow heat and moisture recovery device (3). A number of perforated holes (3012) are evenly arranged on the perforated plate (302). The diameter of the perforated holes gradually increases along the direction of the exhaust airflow, so that the exhaust airflow is evenly dispersed and fully contacts the heat transfer medium, thereby improving the heat and moisture recovery efficiency. Above the air distribution perforated plate (302), several flow guide baffles (301) are arranged alternately. The exhaust airflow enters the exhaust airflow heat and moisture recovery unit (3) from the exhaust airflow inlet (303) at the bottom of the exhaust airflow heat and moisture recovery unit (3), first flows through the air distribution perforated plate (302), then flows through the flow channel formed by the flow guide baffles (301), and then enters the water-air separator (15) through the exhaust airflow outlet (308) located at the top of the exhaust airflow heat and moisture recovery unit (3). While the exhaust airflow is flowing, it fully exchanges heat and moisture with the heat transfer medium. The flow direction of the exhaust airflow is the same as the flow direction of the heat transfer medium to reduce the power consumption of the exhaust fan and avoid blockage of the exhaust airflow.

2. The method for comprehensive recovery and utilization of waste heat and water from dehumidified airflow according to claim 1, characterized in that: Under the action of the circulating pump (2), the heat transfer medium enters the exhaust airflow heat and moisture recovery unit (3) from the circulating water inlet (304) at the bottom of the exhaust airflow heat and moisture recovery unit (3), absorbs the waste heat of the exhaust airflow, and the temperature gradually increases. Then it flows out from the circulating water outlet (309) at the top of the exhaust airflow heat and moisture recovery unit (3). The heat transfer medium with gradually increasing temperature generates a vertically upward thermosiphon head, which is consistent with the head of the circulating pump (2) to increase the head of the circulating pump (2) and reduce its power consumption. The condensate from the exhaust airflow enters the sedimentation tank (17) through the condensate outlet (306) and the water collection pipe (13) at the bottom of the exhaust airflow heat and moisture recovery unit (3), and then enters the water collection tank (9) through the overflow pipe (18) and the filter (21) to recover the water in the exhaust airflow.

3. A system for the comprehensive recovery and utilization of waste heat and water from dehumidified airflow, characterized in that: The system includes a dehumidification airflow heat and moisture recovery unit (3), a partition wall heat exchanger (1), a water-air separator (15), a dehumidification fan (5), a circulating pump (2), a circulating water pipe (6), and a dehumidification air duct (4). The dehumidification airflow from the drying chamber, under the action of the dehumidification fan (5), enters the dehumidification airflow heat and moisture recovery unit (3) through the dehumidification air duct (4) from the dehumidification airflow inlet (303) of the dehumidification airflow heat and moisture recovery unit (3). One end of the condensate outlet pipe (10) is connected to the condensate outlet (303) of the dehumidification airflow heat and moisture recovery unit (3). 06) Connect the other end to the middle of the water collection pipe (13), and the water collection pipe (13) is then connected to the water-air separator (15); the suction end of the circulating pump (2) is connected to the circulating water outlet (309) of the exhaust airflow heat and moisture recovery unit (3) through the circulating water pipe (6), and the discharge end of the circulating pump (2) is connected to the water side inlet of the partition wall heat exchanger (1) through the circulating water pipe (6); the water side outlet of the partition wall heat exchanger (1) is connected to the circulating water inlet (304) of the exhaust airflow heat and moisture recovery unit (3) through the circulating water pipe (6); The dehumidification airflow heat and humidity recovery unit (3) includes a flow guide baffle (301), an air distribution plate (302), a dehumidification airflow inlet (303), a circulating water inlet (304), a drain outlet (305), a condensate outlet (306), a water filling port (307), a dehumidification airflow outlet (308), a circulating water outlet (309), a metal shell (3010), a heat insulation layer (3011), and air distribution holes (3012). The dehumidification airflow heat and humidity recovery unit (3) is provided with a circulating water inlet (304) and a drain outlet (305) at the bottom. The upper left side of the dehumidification airflow heat and humidity recovery unit (3) is provided with a water filling port (307) and the right side is provided with a circulating water outlet (309). The circulating water outlet (309) is connected to the partition heat exchanger (1) through the circulating pump (2). The water filling pipe (11) is connected to the water filling port (307). The water filling pipe (11) is provided with a water filling valve (12). The upper part of the dehumidification airflow heat and humidity recovery unit (3) is provided with a dehumidification airflow outlet (308). The dehumidification airflow inlet (303), the condensate outlet (306), and the dehumidification airflow outlet (308) are respectively connected to the dehumidification air duct (4), the condensate outlet pipe (10), and the outlet pipe (308). The air duct (14) is connected, and the air outlet duct (14) is then connected to the water-air separator (15); the air distribution plate (302) is located at the lower part of the exhaust airflow heat and moisture recovery device (3). Air distribution holes (3012) are evenly arranged on the air distribution plate (302). The diameter of the air distribution holes gradually increases along the direction of the exhaust airflow, so that the exhaust airflow is evenly dispersed and fully contacts the heat transfer medium to improve the heat and moisture recovery efficiency; several flow guide baffles (301) are arranged alternately on the top of the air distribution plate (302). The metal shell (3010) of the air distribution plate (302) is made of stainless steel, and the outside of the metal shell (3010) is provided with a heat insulation layer (3011). The heat insulation layer (3011) is made of polyurethane.

4. The dehumidification airflow waste heat and water comprehensive recovery and utilization system according to claim 3, characterized in that: It also includes a sedimentation tank (17), an overflow pipe (18), a filter (21), a water collection tank (9), a drain pipe (7) for the dehumidification airflow heat and humidity recovery unit, a drain valve (8) for the dehumidification airflow heat and humidity recovery unit, a drain valve (19) for the sedimentation tank, and a drain pipe (20) for the sedimentation tank. The water collection pipe (13) connected to the condensate outlet pipe (10) is also connected to the sedimentation tank (17), the overflow pipe (18), the filter (21), and the water collection tank (9) in sequence. The lower part of the sedimentation tank (17) is connected to the drain pipe (20) for the sedimentation tank through the drain valve (19) for the sedimentation tank. The water-air separator (15) is equipped with an exhaust pipe (16).

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