A heater-free condensation adsorption integrated dehumidification dryer and drying method

Abstract

The present invention relates to the technical field of dryers, and more specifically to a heater-free condensation adsorption integrated dehumidification dryer and a drying method. The condensation adsorption integrated dehumidification dryer includes a heat exchange system and two drying towers, the two drying towers are connected in parallel via a connecting pipe, the heat exchange system includes two heat exchangers, the two heat exchangers are respectively arranged in the two drying towers, the two heat exchangers are connected in series via a heat exchange pipe, a compressor, a valve, and an expansion joint are provided on the heat exchange pipe, the compressor is used to compress the refrigerant in the heat exchange pipe from a low-temperature, low-pressure gas into a high-temperature, high-pressure gas, the expansion joint is used to convert a normal-temperature, high-pressure liquid into a low-temperature, low-pressure liquid, and the valve is used to control the flow direction of the refrigerant in the heat exchanger, so that the two heat exchangers can be switched between cooling and heating. The present invention can save a large amount of heating energy consumption and improve the adsorption efficiency of the desiccant by adding a heat exchange system to replace the existing heating cylinder.

Description

Technical Field

[0001] This invention relates to the field of dryer technology, specifically to a heater-free condensation adsorption integrated dehumidification dryer and drying method. Background Technology

[0002] like Figure 1 As shown, the existing ash removal air compressor dryer includes two drying towers 1, namely tower A and tower B. Both tower A and tower B are equipped with desiccant 101. The bottom of tower A and tower B are connected to exhaust water inlet pipe 9 and air inlet pipe 7. The exhaust water inlet pipe 9 is equipped with pneumatic valve 12 (3#) and pneumatic valve 13 (4#). The air inlet pipe 7 is equipped with pneumatic valve 10 (1#) and pneumatic valve 11 (2#). The top of tower A and tower B are connected to air outlet pipe. The air outlet pipe is equipped with check valve 14 (1#), check valve 15 (2#), check valve 16 (3#), check valve 17 (4#), manual valve 18, and heating cylinder 19.

[0003] The working principle of this ash removal air compressor dryer is as follows: If tower A adsorbs and tower B regenerates, the PLC controls the corresponding solenoid valves, causing pneumatic valves 1# (10) and 4# (13) to open, and pneumatic valves 2# (11) and 3# (12) to close. The compressed air to be dried enters through air inlet 6, flows through pneumatic valve 1# (10) to the lower part of tower A, and flows upward through desiccant 101. The moisture in the compressed air is adsorbed. After drying, the compressed air passes through check valve 1# (14), and 94% of the gas is discharged from air outlet 20. Approximately 6% of the dried compressed air enters the heating cylinder 19 through manual valve 18, is heated, and then flows through tower B, carrying away the moisture in the desiccant 101. Finally, it is discharged through pneumatic valve 4# (13) from exhaust outlet 8. This working state lasts for one hour, then switches to the "tower B adsorption, tower A regeneration" working state (the four pneumatic valves change to the opposite state, and the working process is similar), and this cycle repeats. However, the energy efficiency ratio of the heater in heating cylinder 19 is always 1 (energy efficiency ratio is equal to the ratio of heating power to input power), and 1 kWh of electricity can only generate 1 kWh of heat. The energy consumption required to heat 6% of dry compressed air is relatively high. Summary of the Invention

[0004] The purpose of this invention is to address the shortcomings of existing technologies by providing a heater-free condensation adsorption integrated dehumidification dryer and drying method. By adding a heat exchange system to replace the existing heating cylinder, a significant amount of heating energy can be saved, and the adsorption efficiency of the desiccant can be improved.

[0005] To address the aforementioned technical problems, in a first aspect, the present invention provides a heater-free condensation adsorption integrated dehumidification dryer, comprising a heat exchange system and two drying towers. The two drying towers are connected in parallel via connecting pipes. Each of the two drying towers is provided with an air inlet and an air outlet. A desiccant is provided in each of the two drying towers to adsorb moisture from the air entering the drying towers through the air inlets. The heat exchange system includes two heat exchangers, which are respectively arranged in the two drying towers and connected in series via heat exchange pipes. A compressor, valves, and expansion joints are provided on the heat exchange pipes. The compressor is used to compress the refrigerant in the heat exchange pipes from a low-temperature, low-pressure gas into a high-temperature, high-pressure gas. The expansion joint is used to change a room-temperature, high-pressure liquid into a low-temperature, low-pressure liquid. The valves are used to control the flow direction of the refrigerant in the heat exchangers, enabling the two heat exchangers to switch between cooling and heating modes.

[0006] Furthermore, the valve includes a two-position four-way solenoid valve.

[0007] In some embodiments, the drying tower includes a tower body, a drying chamber and a flow channel are provided inside the tower body, one end of the drying chamber is connected to the air inlet of the drying tower, the other end of the drying chamber is connected to the flow channel, the desiccant is arranged in the drying chamber, the flow channel is connected to the air outlet of the drying tower, and the heat exchanger is arranged in the flow channel.

[0008] Furthermore, the flow channel is arranged on the outer side of the drying chamber wall.

[0009] Furthermore, a first cylinder is provided inside the tower body, the bottom of the first cylinder is connected to the bottom of the tower body, a first channel is provided between the top of the first cylinder and the top of the tower body, the drying chamber is formed inside the first cylinder, and the flow channel is formed between the first cylinder and the tower body, and the flow channel is connected to the drying chamber through the first channel.

[0010] Furthermore, a second cylinder is provided inside the tower body, the diameter of the second cylinder being larger than the diameter of the first cylinder. The top of the second cylinder is connected to the top of the tower body, and a second channel is provided between the bottom of the second cylinder and the bottom of the tower body. A first flow channel is formed between the second cylinder and the first cylinder, and a second flow channel is formed between the second cylinder and the tower body. The upper end of the first flow channel is connected to the drying chamber through the first channel, and the lower end of the first flow channel is connected to the lower end of the second flow channel through the second channel. The upper end of the second flow channel is connected to the air outlet of the tower body.

[0011] In some embodiments, the heat exchanger includes heat exchange tubes arranged in a spiral pattern on the outer side of the drying chamber wall.

[0012] Furthermore, fins are provided on the heat exchange tube.

[0013] In some embodiments, a gas-liquid separator is provided on the tower body, which is used to separate condensate from the flow channel.

[0014] Secondly, the present invention provides a drying method for a heater-free condensation adsorption integrated dehumidification dryer, comprising:

[0015] The two drying towers are tower A and tower B, respectively.

[0016] When tower A is working to absorb water and tower B is regenerating and draining water, the compressor is turned on and the two-position four-way solenoid valve is controlled to allow the refrigerant to flow from tower A through the compressor to tower B. This causes the heat exchanger in tower B to release heat and regenerate the desiccant in tower B. The heat exchanger in tower A absorbs heat and increases the humidity of the compressed air in tower A.

[0017] When tower B is working and absorbing water, and tower A is regenerating and draining water, the compressor is turned on and the two-position four-way solenoid valve is controlled to allow the refrigerant to flow from tower B through the compressor to tower A. This causes the heat exchanger in tower A to release heat and regenerate the desiccant in tower A. The heat exchanger in tower B absorbs heat, increasing the humidity of the compressed air in tower B.

[0018] The beneficial effects of this invention are as follows:

[0019] 1. This invention, by installing a heat exchanger inside the drying tower and using a compressor to compress the refrigerant, causes the heat exchanger corresponding to the drying tower that absorbs water to absorb heat, while the heat exchanger corresponding to the drying tower that regenerates and drains water to release heat. The temperature in the drying tower that absorbs water decreases, increasing the relative humidity of the compressed air to be dried, making it easier for moisture in the compressed air to precipitate and improving the water absorption efficiency of the desiccant. The temperature in the drying tower that regenerates and drains water increases, allowing the desiccant to regenerate and precipitate moisture under high-temperature conditions. The heater in the heating cylinder can then stop working. The working principle of the heat exchange system is similar to that of an air conditioner. Since the energy efficiency ratio of heating through an air conditioner mechanism is about 1:3, meaning that 1 kWh of electricity can generate more than 3 kWh of heat, a significant amount of heating energy can be saved compared to using a heating cylinder.

[0020] 2. By setting up a first cylinder, the flow channel is arranged outside the drying chamber. For the drying tower that absorbs water during operation, the drying chamber is always subjected to the heat absorption effect of the refrigerant in the flow channel, maintaining a low temperature. This increases the relative humidity of the compressed air entering the drying chamber, making it easier for moisture in the compressed air to precipitate out, thus improving the water absorption efficiency of the desiccant. For the drying tower that drains wastewater during regeneration, the drying chamber is always subjected to the heat dissipation effect of the refrigerant in the flow channel, maintaining a high temperature. This makes it easier for moisture in the desiccant in the drying chamber to precipitate out. Moreover, the compressed air is heated first by passing through the flow channel and then through the desiccant, carrying away the moisture in the desiccant, thus improving the regeneration efficiency.

[0021] 3. By adding a second cylinder, the present invention increases the length of the flow channel, which is beneficial to improving the heating and cooling effect of compressed air, as well as the heating and cooling effect of the drying chamber.

[0022] 4. The heat exchange tube of the present invention is provided with fins, which further improves the heat exchange efficiency. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of a dust removal air compressor dryer in the prior art;

[0024] Figure 2 This is a schematic diagram of the two-position four-way solenoid valve of the drying tower of the present invention operating on the right side;

[0025] Figure 3 This is a schematic diagram of the two-position four-way solenoid valve of the drying tower of the present invention operating on the left side;

[0026] Figure 4 This is a schematic diagram of the internal structure of the drying tower of the present invention;

[0027] Figure 5 This is a diagram showing the flow direction of compressed air in the two drying towers according to the present invention.

[0028] Reference numerals: Drying tower 1; Desiccant 101; First cylinder 102; Second cylinder 103; First flow channel 104; Second flow channel 105; First channel 106; Second channel 107; Gas-liquid separator 108; Heat exchanger 2; Heat exchange tube 201; Fin 202; Compressor 3; Two-position four-way solenoid valve 4; Expansion joint 5; Air inlet 6; Air inlet pipe 7; Exhaust outlet 8; Exhaust outlet pipe 9; Pneumatic valve #1 10; Pneumatic valve #2 11; Pneumatic valve #3 12; Pneumatic valve #4 13; Check valve #1 14; Check valve #2 15; Check valve #3 16; Check valve #4 17; Manual valve 18; Heating cylinder 19; Air outlet 20; Heat exchange pipe 21. Detailed Implementation

[0029] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0030] like Figure 2As shown, the present invention provides a heater-free condensation adsorption integrated dehumidification dryer, including a heat exchange system and two drying towers 1. The two drying towers 1 are connected in parallel through connecting pipes. Each drying tower 1 is provided with an air inlet and an air outlet. The air inlet is located at the bottom of the drying tower 1, and the air outlet is located at the top of the drying tower 1. A desiccant 101 is provided in each of the two drying towers 1. The desiccant 101 is used to adsorb moisture in the air entering the drying tower 1 from the air inlet.

[0031] The two drying towers 1 are tower A and tower B, connected by an air inlet pipe 7 and an exhaust water outlet pipe 9. The air inlet pipe 7 and the exhaust water outlet pipe 9 are connected in parallel. The air inlet pipe 7 is equipped with an air inlet 6, a pneumatic valve 10, and a pneumatic valve 11, which are located on both sides of the air inlet 6. The exhaust water outlet pipe 9 is equipped with an exhaust water outlet 8, a pneumatic valve 12, and a pneumatic valve 13, which are located at the exhaust water outlet. On both sides of 8, the two ends of the air inlet pipe 7 are connected to the air inlets of the two drying towers 1 respectively. By opening pneumatic valve 10 (1#) or pneumatic valve 11 (2#), the compressed air to be dried enters tower A or tower B through the air inlet pipe 7. The two ends of the exhaust water outlet pipe 9 are connected to the air inlets of the two drying towers 1 respectively. By opening pneumatic valve 12 (3#) or pneumatic valve 13 (4#), the dried compressed air carries away the moisture from the desiccant 101 in tower A or tower B and is discharged through the exhaust water outlet 8 of the exhaust water outlet pipe 9. The dryer, also called a molecular sieve, is composed of aluminum oxide and calcium oxide.

[0032] The heat exchange system includes two heat exchangers 2, which are respectively arranged in two drying towers 1. The two heat exchangers 2 are connected in series by heat exchange pipes 21. A compressor 3, valves, and an expansion joint 5 are installed on the heat exchange pipes 21. The compressor 3 is used to compress the refrigerant in the heat exchange pipes 21 from low-pressure gas to high-pressure gas. The valves are used to control the flow direction of the refrigerant in the heat exchangers 2, allowing the two heat exchangers 2 to switch between cooling and heating modes. The heat exchange pipes 21 include a first heat exchange pipe 21 and a second heat exchange pipe 21. The compressor 3 and valves are installed on the first heat exchange pipe 21, and the expansion joint 5 is installed on the second heat exchange pipe 21. One end of the first heat exchange pipe 21 is connected to one end of the heat exchanger 2 in tower A, and the other end of the first heat exchange pipe 21 is connected to one end of the heat exchanger 2 in tower B. One end of the second heat exchange pipe 21 is connected to the other end of the heat exchanger 2 in tower A, and the other end of the second heat exchange pipe 21 is connected to the other end of the heat exchanger 2 in tower B.

[0033] Understandably, when the refrigerant flows from tower A through compressor 3 into tower B, it is compressed into a high-temperature, high-pressure gas by compressor 3. Upon entering tower B, it dissipates heat through heat exchanger 2, raising the temperature inside tower B and also increasing the temperature of the dried compressed air entering tower B. This regenerates the desiccant 101 in tower B. The high-temperature, high-pressure refrigerant then becomes a room-temperature, high-pressure liquid refrigerant. This liquid refrigerant passes through expansion joint 5, which has a perforated structure. This perforation creates a throttling effect, reducing the pressure and resulting in a low-temperature, low-pressure liquid refrigerant. This low-temperature, low-pressure liquid refrigerant then enters tower A, further lowering the temperature inside tower A and the temperature of the compressed air entering tower A. Lower air temperature and higher humidity improve the adsorption effect of the desiccant 101 in tower A. This achieves a cycle of adsorption and regeneration between the two drying towers 1.

[0034] Since this application can directly utilize the heat exchange system to achieve the cyclic operation and regeneration of the two drying towers 1, there is no need to use the heating cylinder 19 to heat the dried compressed air. Furthermore, the energy efficiency ratio of the heat exchange system is approximately 1:3, meaning that it can generate more than 3 kWh of heat for every 1 kWh of electricity consumed. Compared to using the heating cylinder 19, this can save a significant amount of heating energy. Moreover, the heating cylinder 19 can be eliminated.

[0035] Furthermore, the valve includes a two-position four-way solenoid valve 4.

[0036] like Figure 2 As shown, when tower B is working to draw water and tower A is regenerating and draining water, the 2-position 4-way solenoid valve 4 is operating on the right side, as follows: Figure 3 As shown, when tower A is working to draw water and tower B is regenerating and draining water, the two-position four-way solenoid valve 4 is operating on the left.

[0037] In some embodiments, such as Figure 4 As shown, the drying tower 1 includes a tower body, a drying chamber and a flow channel are provided inside the tower body. One end of the drying chamber is connected to the air inlet of the drying tower 1, and the other end of the drying chamber is connected to the flow channel. The desiccant 101 is arranged in the drying chamber. The flow channel is connected to the air outlet of the drying tower 1, and the heat exchanger 2 is arranged in the flow channel.

[0038] Furthermore, the flow channel is arranged on the outer side of the drying chamber wall.

[0039] Furthermore, such as Figure 4 As shown, a first cylinder 102 is provided inside the tower body. The bottom of the first cylinder 102 is connected to the bottom of the tower body. A first channel 106 is provided between the top of the first cylinder 102 and the top of the tower body. A drying chamber is formed inside the first cylinder 102. A flow channel is formed between the first cylinder 102 and the tower body. The flow channel is connected to the drying chamber through the first channel 106.

[0040] This invention, by setting the first cylinder 102, arranges the flow channel outside the drying chamber, such as... Figure 5 As shown, the left side is the drying tower 1 for regeneration drainage, and the right side is the drying tower 1 for working water absorption. The arrows and dashed lines indicate the flow direction of compressed air in the drying tower 1. For the drying tower 1 for working water absorption, the drying chamber is always subjected to the heat absorption effect of the refrigerant in the flow channel, maintaining a low temperature state. This increases the relative humidity of the compressed air entering the drying chamber, making it easier for the moisture in the compressed air to precipitate out, thus improving the water absorption efficiency of the desiccant 101. For the drying tower 1 for regeneration drainage, the drying chamber is always subjected to the heat dissipation effect of the refrigerant in the flow channel, maintaining a high temperature state. This makes it easier for the moisture in the desiccant 101 in the drying chamber to precipitate out. Moreover, the compressed air is first heated by passing through the flow channel and then passes through the desiccant 101, carrying away the moisture in the desiccant 101, thus improving the regeneration efficiency.

[0041] Furthermore, such as Figure 4 As shown, a second cylinder 103 is provided inside the tower body. The diameter of the second cylinder 103 is larger than that of the first cylinder 102. The top of the second cylinder 103 is connected to the top of the tower body. A second channel 107 is provided between the bottom of the second cylinder 103 and the bottom of the tower body. A first flow channel 104 is formed between the second cylinder 103 and the first cylinder 102. A second flow channel 105 is formed between the second cylinder 103 and the tower body. The upper end of the first flow channel 104 is connected to the drying chamber through the first channel 106. The lower end of the first flow channel 104 is connected to the lower end of the second flow channel 105 through the second channel 107. The upper end of the second flow channel 105 is connected to the air outlet of the tower body.

[0042] By adding a second cylinder 103, the present invention increases the length of the flow channel, which is beneficial to improving the heating and cooling effect of compressed air, as well as the heating and cooling effect of the drying chamber.

[0043] In some embodiments, the heat exchanger 2 includes a heat exchange tube 201, which may be made of copper and is arranged in a spiral shape on the outer side of the drying chamber wall.

[0044] Furthermore, fins 202 are provided on the heat exchange tube 201. The fins 202 can further improve the heat exchange efficiency.

[0045] In some embodiments, a gas-liquid separator 108 is provided on the tower body, which is used to separate condensate from the flow channel.

[0046] Secondly, the present invention provides a drying method for a heater-free condensation adsorption integrated dehumidification dryer, comprising:

[0047] When tower A is working to absorb water and tower B is regenerating and draining water, the PLC controls the corresponding solenoid valves, causing pneumatic valves 1# and 4# to open and pneumatic valves 13# to close and pneumatic valves 2# and 3# to close. The compressor 3 is turned on, and the two-position four-way solenoid valve 4 is controlled to work on the left side, so that the refrigerant flows from tower A to tower B through the compressor 3. This causes the heat exchanger 2 in tower B to release heat and the heat exchanger 2 in tower A to absorb heat. The compressed air to be dried enters through the air inlet 6, flows through pneumatic valve 1# and enters tower A through the air inlet of tower A. The compressed air to be dried flows from bottom to top through the desiccant 101 in tower A, and the moisture in the compressed air is absorbed. After the dried compressed air passes through check valve 1#, 94% of the compressed gas is discharged from the air outlet 20, and about 6% of the dried compressed air enters tower B through manual valve 18, taking away the moisture in the desiccant 101 in tower B. Finally, it is discharged through pneumatic valve 4# through the exhaust water outlet 8.

[0048] When tower B is absorbing water and tower A is regenerating and draining water, the PLC controls the corresponding solenoid valves, causing pneumatic valves 2# and 3# to open and pneumatic valves 10# and 4# to close. Compressor 3 is turned on, and the two-position four-way solenoid valve 4 is controlled to operate on the right side, allowing refrigerant to flow from tower B through compressor 3 to tower A. This causes heat exchanger 2 in tower A to release heat and heat exchanger 2 in tower B to absorb heat. The compressed air to be dried enters through air inlet 6, flows through pneumatic valve 2# and enters tower B through the air inlet. Inside tower B, the compressed air flows upwards through desiccant 101, adsorbing moisture. After passing through check valve 2#, 94% of the compressed air is discharged from air outlet 20, and approximately 6% of the dried compressed air enters tower A through manual valve 18, carrying away moisture from desiccant 101. Finally, it is discharged through pneumatic valve 3# and drained from exhaust port 8.

[0049] The above-described embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be included within the protection scope of this application.

Claims

1. A heater-free condensation adsorption integrated dehumidification dryer, characterized in that: The system includes a heat exchange system and two drying towers (1). The two drying towers (1) are connected in parallel by connecting pipes. Each of the two drying towers (1) is provided with an air inlet and an air outlet. Each of the two drying towers (1) is provided with a desiccant (101). The desiccant (101) is used to adsorb moisture in the air entering the drying tower (1) from the air inlet. The heat exchange system includes two heat exchangers (2). The two heat exchangers (2) are respectively arranged in the two drying towers (1). The two heat exchangers (2) are connected in series by a heat exchange pipe (21). The heat exchange pipe (21) is provided with a compressor (3), a valve, and an expansion joint (5). The compressor (3) is used to compress the refrigerant in the heat exchange pipe (21) from low temperature and low pressure gas to high temperature and high pressure gas. The expansion joint (5) is used to change the room temperature and high pressure liquid into low temperature and low pressure liquid. The valve is used to control the flow direction of the refrigerant in the heat exchanger (2), so that the two heat exchangers (2) can switch between cooling and heating. The drying tower (1) includes a tower body, a drying chamber and a flow channel are provided in the tower body, one end of the drying chamber is connected to the air inlet of the drying tower (1), the other end of the drying chamber is connected to the flow channel, the desiccant (101) is arranged in the drying chamber, the flow channel is connected to the air outlet of the drying tower (1), and the heat exchanger (2) is arranged in the flow channel. The flow channel is arranged on the outer side of the drying chamber wall; The tower body is provided with a first cylinder (102), the bottom of the first cylinder (102) is connected to the bottom of the tower body, a first channel (106) is provided between the top of the first cylinder (102) and the top of the tower body, the drying chamber is formed inside the first cylinder (102), the flow channel is formed between the first cylinder (102) and the tower body, and the flow channel is connected to the drying chamber through the first channel (106); The tower body is provided with a second cylinder (103), the diameter of which is larger than that of the first cylinder (102). The top of the second cylinder (103) is connected to the top of the tower body. A second channel (107) is provided between the bottom of the second cylinder (103) and the bottom of the tower body. A first flow channel (104) is formed between the second cylinder (103) and the first cylinder (102). A second flow channel (105) is formed between the second cylinder (103) and the tower body. The upper end of the first flow channel (104) is connected to the drying chamber through the first channel (106). The lower end of the first flow channel (104) is connected to the lower end of the second flow channel (105) through the second channel (107). The upper end of the second flow channel (105) is connected to the air outlet of the tower body.

2. The heater-free condensation adsorption integrated dehumidification dryer according to claim 1, characterized in that: The valve includes a two-position four-way solenoid valve (4).

3. The heater-free condensation adsorption integrated dehumidification dryer according to claim 1, characterized in that: The heat exchanger (2) includes a heat exchange tube (201) which is arranged in a spiral shape on the outer side of the drying chamber wall.

4. The heater-free condensation adsorption integrated dehumidification dryer according to claim 3, characterized in that: The heat exchange tube (201) is provided with fins (202).

5. The heaterless condensation adsorption integrated dehumidification dryer according to claim 1, characterized in that: A gas-liquid separator (108) is installed on the tower body, which is used to separate the condensate in the flow channel.

6. A drying method for a heaterless condensation adsorption integrated dehumidification dryer according to any one of claims 1 to 5, characterized in that: include: The two drying towers (1) are tower A and tower B, respectively; When tower A is working to absorb water and tower B is regenerating and draining water, the compressor (3) is turned on and the two-position four-way solenoid valve (4) is controlled to make the refrigerant flow from tower A through the compressor (3) to tower B, so that the heat exchanger (2) in tower B releases heat and regenerates the desiccant (101) in tower B. The heat exchanger (2) in tower A absorbs heat and increases the humidity of the compressed air in tower A. When tower B is working to absorb water and tower A is regenerating and draining water, the compressor (3) is turned on and the two-position four-way solenoid valve (4) is controlled to make the refrigerant flow from tower B through the compressor (3) to tower A, so that the heat exchanger (2) in tower A releases heat and regenerates the desiccant (101) in tower A. The heat exchanger (2) in tower B absorbs heat and increases the humidity of the compressed air in tower B.

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