A three-way pipe section-based deep dehumidification air handling system and method

Abstract

This invention belongs to the field of HVAC system technology and relates to a deep dehumidification air handling system based on a three-way pipe section. It includes a cold source unit and a return air handling unit. The return air handling unit includes an air-to-air sensible heat recovery unit and a solution regeneration device, a surface cooler, a solution dehumidification device, and a purification module connected in sequence. A three-way pipe is designed after the solution dehumidification device, using the three-way pipe section to divide the outlet air of the solution dehumidification device into two streams. The outlet air of the solution dehumidification device exhibits a differentiated distribution of moisture content, with lower levels at the top and higher levels at the bottom. The three-way pipe section can separate air with different moisture levels, which is beneficial for delivering the drier portion of air into the room in the form of supply air, effectively achieving the deep dehumidification requirement. Simultaneously, a small amount of outlet air located at the bottom of the solution dehumidification device is mixed with the return air, reducing the air moisture content at the inlet of the solution regeneration device and lowering the heat source temperature requirement for the solution regeneration process.

Description

Technical Field

[0001] This invention belongs to the field of HVAC system technology, specifically relating to a deep dehumidification air treatment system and method based on a three-way pipe section. Background Technology

[0002] Unlike residential buildings, industrial buildings involve numerous production and storage processes, placing much stricter demands on air temperature and humidity. Unlike ensuring human comfort, many industrial scenarios, such as battery production, chip manufacturing, and explosives storage, require significantly lower ambient air humidity levels than residential buildings, with many processes requiring humidity levels below 7 g / kg dry air. However, conventional air conditioning systems use a single cooling source to simultaneously regulate both temperature and humidity, leading to the following two disadvantages in deep dehumidification scenarios:

[0003] 1. After deep dehumidification, the air temperature is too low, and it can only be put into the room after reheating. However, the reheating process is accompanied by significant heat and cold cancellation, which leads to energy waste.

[0004] 2. A single cold source cannot adapt to the dynamic ratio changes of indoor heat load and humidity load, and cannot achieve efficient and accurate temperature and humidity parameter control, which will directly affect production efficiency and product quality.

[0005] To address the deep dehumidification needs of the aforementioned industrial scenarios, there is an urgent need for efficient deep dehumidification systems that can meet environmental temperature, humidity, and cleanliness requirements while improving system energy efficiency and reducing carbon emissions. With the widespread adoption of mechanization and automation, many industrial scenarios requiring deep dehumidification have achieved fully automated production, eliminating the need for mechanical ventilation systems in unattended production workshops. In these scenarios, adding mechanical ventilation, especially in tropical and subtropical climates, would introduce additional heat and humidity loads, hindering the system's energy-saving and low-carbon operation. For these industrial scenarios, an air treatment method that processes the return air before returning it to the room is more efficient, achieving energy-saving and low-carbon operation while meeting temperature, humidity, and cleanliness control requirements.

[0006] Dehumidification methods generally include refrigeration dehumidification, rotary dehumidification, and solution dehumidification. Compared with conventional refrigeration dehumidification, solution dehumidification offers advantages such as no need for reheating after dehumidification and the ability to utilize low-grade energy. In recent years, solution dehumidification air handling units have experienced rapid development, application, and promotion to meet the air humidity control needs of some industrial buildings. Using solution dehumidification, the moisture content of the supply air can be reduced to as low as 2-3 g / kg dry air under normal pressure, better addressing the deep dehumidification requirements of such industrial applications and creating an energy-saving and low-carbon thermal and humid environment.

[0007] When solution dehumidification is applied to the aforementioned low-humidity industrial scenarios, and air and dehumidification solution exchange heat and mass in a cross-flow manner, the air at the outlet section of the solution dehumidification device exhibits significant non-uniform parameter distribution characteristics. This non-uniformity becomes increasingly pronounced as the required moisture content of the supplied air decreases. Therefore, there is an urgent need to propose a highly efficient deep dehumidification method suitable for these scenarios to improve the aforementioned non-uniform distribution characteristics, reduce the corresponding mixing losses, and improve the energy efficiency of the dehumidification system. Summary of the Invention

[0008] The purpose of this invention is to provide a deep dehumidification air treatment system and method based on a three-way pipe section, which solves the problem that uneven distribution of air parameters after deep dehumidification with solution makes it difficult to further improve the system's energy efficiency.

[0009] This invention is achieved through the following technical solution:

[0010] This invention discloses a deep dehumidification air handling system based on a three-way pipe section, including a cold source unit and a return air handling unit;

[0011] The return air handling unit includes an air-to-air sensible heat recovery unit, and a solution regeneration device, a surface cooler, a solution dehumidification device, and a purification module connected in sequence; the surface cooler is connected to the cold source unit.

[0012] The air-to-air sensible heat recovery unit is divided into two parts. The first part is connected between the solution regeneration device and the surface cooler, and the other part is connected between the solution dehumidification device and the purification module.

[0013] A three-way pipe section is provided between the solution dehumidification device and the air-to-air sensible heat recovery unit;

[0014] The first port of the three-way pipe section is connected to the air outlet of the solution dehumidification device, and the second port is connected to the air inlet of the air-to-air sensible heat recovery unit. This is used to send the drier portion of the air from the upper air outlet of the solution dehumidification device into the air-to-air sensible heat recovery unit. The third port is connected to the air inlet of the solution regeneration device. This is used to separate the lower portion of the air with higher moisture content from the air outlet of the solution dehumidification device and send it to the front of the solution regeneration device to mix with the inlet return air of the return air treatment unit for the solution concentration and regeneration process.

[0015] The cross-sectional area ratio of the second and third ports of the tee section is 7.5:2.5 to 9.0:1.0.

[0016] Furthermore, the cold source unit includes a chiller and a chilled water pump. The surface cooler is equipped with a cooling water inlet and a cooling water outlet. The cooling water inlet is connected to the chilled water pump, and the cooling water outlet is connected to the chiller.

[0017] Furthermore, a circulation loop is provided between the solution regeneration device and the solution dehumidification device. The circulation loop includes a solution circulation pump, a condenser, an evaporator, and a compressor. The solution circulation pump includes a first circulation pump located at the bottom of the solution regeneration device and a second circulation pump located at the bottom of the solution dehumidification device.

[0018] The condenser, evaporator, and compressor are connected in sequence to form a connection circuit;

[0019] The condenser is connected to the first circulation pump and the solution regeneration device, and the evaporator is connected to the second circulation pump and the solution dehumidification device.

[0020] Furthermore, a throttling valve is also installed between the condenser and the evaporator.

[0021] Furthermore, a solution-solution heat recovery unit is also provided between the solution regeneration unit and the solution dehumidification unit. The solution-solution heat recovery unit is set on the circulation loop and is used to regulate the outlet temperature of the two liquids to achieve heat recovery.

[0022] Furthermore, the dehumidification device contains a dehumidification solution.

[0023] Furthermore, the purification module uses an air filter.

[0024] The present invention also discloses a deep dehumidification air treatment method based on a three-way pipe section of the system, comprising the following steps:

[0025] The return air is first mixed with a small amount of air from the bottom of the solution dehumidification device; the mixed air then passes through the solution regeneration device to absorb the moisture in the solution, while simultaneously concentrating and regenerating the dehumidification solution.

[0026] Subsequently, the regenerated outlet air passes through an air-to-air sensible heat recovery unit, where it indirectly exchanges heat with the solution dehumidification outlet air, thereby cooling the regenerated outlet air.

[0027] The cooled air passes through the surface cooler, where heat exchange takes place, achieving cooling and dehumidification of the air.

[0028] The cooled air is then dehumidified in the solution dehumidification device. The dehumidified air is then separated into two parts by a three-way pipe: a small portion of the air with higher moisture content in the lower section of the air outlet of the solution dehumidification device is separated and sent to the solution regeneration device, where it is mixed with the return air at the inlet of the return air treatment unit for the solution concentration and regeneration process.

[0029] The drier portion of the air at the upper part of the air outlet of the solution dehumidification device is separated to the second port of the three-way pipe section, and indirectly exchanges heat with the outlet air of the solution regeneration device through the air-to-air sensible heat recovery unit to achieve reheating of the supply air and meet the requirements for supply air temperature.

[0030] Finally, the air after cascade dehumidification flows through an air filter to meet the filtration requirements for the supplied air.

[0031] Furthermore, the concentration and regeneration process of the dehumidification solution is as follows:

[0032] In the solution regeneration device, the circulating solution is heated by the condenser, which increases the water vapor partial pressure on its surface. The solution is sprayed down from the top of the regeneration device and comes into direct contact with the horizontally flowing return air during its downward flow. Mass transfer is achieved by utilizing the water vapor partial pressure difference between the gas and liquid, and the water in the solution evaporates into the return air, thus achieving concentration and regeneration of the solution. The concentrated and regenerated solution located at the bottom of the solution regeneration device is transported to the dehumidification side through the interstage flow pipeline.

[0033] In the solution dehumidification device, the circulating solution is cooled by the evaporator to reduce the partial pressure of water vapor on its surface. The solution is sprayed down from the top of the solution dehumidification device and comes into direct contact with the horizontally flowing airflow during its downward flow. Mass transfer is achieved by utilizing the water vapor partial pressure difference between the gas and liquid, thus dehumidifying the air. After absorbing moisture, the concentration of the solution decreases and its moisture absorption capacity weakens. A portion of the dilute solution located at the bottom of the solution dehumidification device is transported to the regeneration side through the interstage flow pipeline to achieve concentration and regeneration.

[0034] Compared with the prior art, the present invention has the following beneficial technical effects:

[0035] This invention discloses a deep dehumidification air handling system based on a three-way pipe section, including a cold source unit and a return air handling unit. The return air handling unit includes an air-to-air sensible heat recovery unit and a solution regeneration device, a surface cooler, a solution dehumidification device, and a purification module connected in sequence. A three-way pipe is designed after the solution dehumidification device to divide the outlet air of the cross-flow solution dehumidification device into two streams. Since the dehumidification solution in the solution dehumidification device flows from top to bottom, the flow is accompanied by a moisture absorption process, and the dehumidification capacity gradually weakens. Therefore, the moisture content of the outlet air of the solution dehumidification device exhibits a differentiated distribution characteristic of low at the top and high at the bottom. The setting of the three-way pipe section can separate air with different moisture content levels, which is conducive to sending the drier air portion into the room in the form of supply air, effectively achieving the deep dehumidification requirement. At the same time, a small amount of outlet air located at the bottom of the solution dehumidification device is mixed with the return air, thereby reducing the air moisture content at the inlet of the solution regeneration device, and thus reducing the heat source temperature required for the solution regeneration process, i.e., reducing the condensing temperature required for the heat pump cycle, thereby improving the energy efficiency level of the heat pump cycle and improving the overall energy efficiency of the air conditioning system.

[0036] By combining surface coolers and solution dehumidification, cascade dehumidification of return air is achieved to meet the low-humidity environment requirements of industrial scenarios. The combination of refrigeration dehumidification and moisture-absorbing solution dehumidification enables the handling and transfer of moisture loads in different humidity ranges, giving full play to the performance advantages of different dehumidification methods in different moisture load ranges and significantly improving system energy efficiency.

[0037] In the return air handling unit, a solution regeneration-dehumidification cycle is used as a means of transferring the moisture load, moving the moisture load from the low-humidity area to the high-humidity area, and then using a refrigeration dehumidification method to treat the transferred moisture load and finally discharge all the moisture load as condensate. The return air mixes with a small amount of air from the bottom of the solution dehumidification device and flows through the solution regeneration device to regenerate the moisture-absorbing solution. Then the air flows through the surface cooler, and the moisture in the air is discharged as condensate using refrigeration dehumidification, thus achieving dehumidification of the air. After that, the air flows through the solution dehumidification device to complete the moisture load treatment, forming a cascade dehumidification structure to achieve deep dehumidification of the air.

[0038] In the return air handling unit, an air-to-air sensible heat recovery unit is installed to exchange sensible heat between the air before the surface cooler and the air after the solution dehumidification device. On the one hand, it heats the low-temperature air after deep dehumidification so that the supply air temperature reaches the required temperature level. On the other hand, it pre-cools the air before the surface cooler, reducing the cooling capacity required for the air handling process of the surface cooler and achieving a highly efficient air handling process.

[0039] Furthermore, the cold source unit utilizes chilled water generated by a chiller unit as the cold source for the surface cooling module; the return air treatment unit uses a solution dehumidification and regeneration device to transfer the moisture load, moving it from the low-humidity area on the dehumidification side to the high-humidity area on the regeneration side, thus achieving the transfer of the moisture load; after the moisture load is transferred, the surface cooler completes the dehumidification task, discharging the transferred moisture load from the system in liquid phase, achieving deep dehumidification to meet humidity control requirements; the return air treatment unit uses an air-to-air sensible heat recovery unit to treat the sensible heat of the air to meet temperature control requirements; and a purification module is selected in the return air treatment unit according to cleanliness requirements to meet cleanliness control requirements. Together, these components construct a deep dehumidification air treatment method suitable for industrial scenarios such as electronics manufacturing, pharmaceutical and chemical preparation, and achieve independent control of air temperature, humidity, and cleanliness.

[0040] Furthermore, the cross-sectional area ratio of the second and third ports of the three-way pipe section is 7.5:2.5 to 9.0:1.0. Through the diversion of this three-way pipe section, the air outlet of the dehumidifier is divided into a main stream (upper part) and a secondary stream (lower part). Since the outlet air of the cross-flow dehumidifier has parameter differences in the vertical direction, with air temperature and humidity gradually increasing from top to bottom, using the main stream air diverted from the three-way pipe section for distribution can improve the air supply quality, i.e., deliver low-temperature, dry air. The secondary stream air, with higher temperature and humidity, is returned to the inlet of the regeneration unit and mixed with the return air to reduce the humidity of the air at the regeneration unit inlet, thereby reducing the regeneration temperature required by the regeneration unit and thus reducing the compressor energy consumption of the heat pump cycle. Too low a distribution ratio will lead to a significant reduction in effective air supply volume, which is not conducive to improving system energy efficiency. Therefore, the mainstream air flow rate should account for more than 75% to ensure the high energy efficiency of the system. Too low a distribution ratio will not be able to give full play to the effect of the three-way pipe section in improving air supply quality and reducing the humidity of the regeneration inlet air. Therefore, the auxiliary air flow rate should account for more than 10% to significantly give full play to the energy-saving advantages brought by the three-way pipe section in separating air.

[0041] Furthermore, an independent heat pump circulation system is set up in the return air treatment unit. Its evaporator cools the hygroscopic solution before it enters the solution dehumidification device, thereby providing the cooling capacity required for the solution dehumidification process; the condenser heats the hygroscopic solution before it enters the solution regeneration device, thereby providing the heat required for the solution regeneration process; a heat recovery unit is set up between the dehumidification / regeneration cycles to recover the cooling and heating capacity. Attached Figure Description

[0042] Figure 1 This is a schematic diagram of a deep dehumidification air treatment method based on a three-way pipe section.

[0043] Figure 2 This is a schematic diagram of the return air treatment unit;

[0044] Among them, A is the cold source unit; B is the return air treatment unit; R is the solution regeneration device; and D is the solution dehumidification device.

[0045] 1. Chiller unit; 2. Chilled water pump; 3. Solution-solution heat recovery unit; 4. Compressor; 5. Condenser; 6. Throttling valve; 7. Evaporator; 8. Solution circulation pump; 9. Air-air sensible heat recovery unit; 10. Surface cooler; 11. T-junction pipe section; 12. Air filter. Detailed Implementation

[0046] To make the objectives, technical solutions, and advantages of the present invention 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 of the invention and are not intended to limit the invention; that is, the described embodiments are only a part of the embodiments of the present invention, and not all of them.

[0047] The components described and illustrated in the accompanying drawings and embodiments of this invention can be arranged and designed in various different configurations. Therefore, the detailed description of the embodiments of the invention provided in the following drawings is not intended to limit the scope of the claimed invention, but merely to illustrate one selected embodiment of the invention. All other embodiments obtained by those skilled in the art based on the accompanying drawings and embodiments of this invention without inventive effort are within the scope of protection of this invention.

[0048] It should be noted that the terms “comprising,” “including,” or any other variations are intended to cover non-exclusive inclusion, such that a process, element, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to the process, element, method, article, or apparatus.

[0049] The features and performance of the present invention will be further described in detail below with reference to embodiments.

[0050] like Figure 1 The diagram illustrates the principle of a deep dehumidification air treatment method that combines solution dehumidification and refrigeration dehumidification, allowing for independent control of temperature, humidity, and cleanliness. The cold source unit A comprises a chiller unit 1, a chilled water pump 2, etc. Figure 2 As shown, the return air treatment unit B consists of a solution regeneration device R, a solution dehumidification device D, a solution-solution heat recovery unit 3, a compressor 4, a condenser 5, a throttle valve 6, an evaporator 7, a solution circulation pump 8, an air-air sensible heat recovery unit 9, a surface cooler 10, and a three-way pipe section 11.

[0051] Chilled water at 7°C is produced by chiller unit 1 and then pumped out by chilled water pump 2 before entering return air treatment unit B. Return air treatment unit B processes the indoor return air, meeting the requirements for temperature control and deep dehumidification. The system utilizes the 7°C chilled water provided by chiller unit 1 to handle the air conditioning load, thereby meeting the heat and humidity control needs and effectively constructing a highly efficient deep dehumidification air conditioning air handling process.

[0052] The return air is first mixed with a small amount of air from the lower part of the solution dehumidification device D; the mixed air then passes through the solution regeneration device R to absorb moisture from the solution, thereby achieving the concentration and regeneration of the dehumidifying solution.

[0053] The regenerated outlet air passes through the air-to-air sensible heat recovery unit 9 and undergoes indirect heat exchange with the solution dehumidification outlet air to achieve cooling of the regenerated outlet air.

[0054] After cooling, the air passes through the surface cooler 10 and exchanges heat with the chilled water at the surface cooler 10, thereby achieving cooling and dehumidification of the air.

[0055] The air is then further processed by the solution dehumidification device D to achieve further dehumidification and meet humidity requirements. Addressing the uneven moisture distribution in the vertical direction of the air after cross-flow solution dehumidification, the air is divided into two parts by a three-way pipe section 11: a small portion of the higher-moisture air in the lower section of the gas three-way pipe 11 is separated and sent to the solution regeneration device R, where it mixes with the return air at the inlet of the return air treatment unit B for solution concentration and regeneration. The three-way pipe section 11 separates the drier upper portion of the air outlet from the solution dehumidification device D to the air-to-air sensible heat recovery unit 9, thereby reducing the moisture content of the supplied air and lowering air handling costs. The separated air then passes through the air-to-air sensible heat recovery unit 9, exchanging heat with the air after the solution regeneration device R to achieve reheating, preventing the air temperature from becoming too low after deep dehumidification and meeting the air temperature requirements. The air after cascade dehumidification further flows through the air filter 12 to meet the filtration requirements for the return air.

[0056] The solution dehumidification-regeneration cycle in return air handling unit B is equipped with an independent heat pump cycle, consisting of compressor 4, condenser 5, expansion valve 6, and evaporator 7. Evaporator 7 cools the solution to meet the cooling requirements of the solution dehumidification process, while condenser 5 heats the solution to meet the heat requirements of the solution regeneration process. A solution-solution heat recovery unit 3 recovers the sensible heat of the solution flow circulating between the solution regeneration unit R and the dehumidification unit D. Both the solution regeneration unit R and the solution dehumidification unit D are equipped with circulation pumps 8 to achieve solution circulation. The air treated by return air handling unit B is then supplied to the indoor terminal, thereby achieving efficient cascade deep dehumidification of the return air and meeting the requirements for independent control of air temperature, humidity, and cleanliness.

[0057] The specific process of concentrating and regenerating the dehumidifying solution is as follows:

[0058] The circulating solution in the solution regeneration device R is heated by the condenser 5, which increases the water vapor partial pressure on its surface. The solution is sprayed down from the top of the regeneration device R and comes into direct contact with the transversely flowing return air during the downward flow. Mass transfer is achieved by utilizing the water vapor partial pressure difference between the gas and liquid, and the water in the solution evaporates into the return air, thus achieving concentration and regeneration of the solution. The part of the solution that has been concentrated and regenerated at the bottom of the solution regeneration device R is transported to the dehumidification side through the interstage flow pipeline.

[0059] The circulating solution in the solution dehumidification device D is cooled by the evaporator 7 to reduce the partial pressure of water vapor on its surface. The solution is sprayed down from the top of the solution dehumidification device D and comes into direct contact with the transversely flowing airflow during the downward flow. Mass transfer is achieved by utilizing the water vapor partial pressure difference between the gas and liquid, thus dehumidifying the air. After absorbing moisture, the concentration of the solution decreases and the moisture absorption capacity weakens. A portion of the dilute solution located at the bottom of the solution dehumidification device D is transported to the regeneration side through the interstage flow pipeline to achieve concentration and regeneration.

[0060] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the specific implementation of the present invention. Any modifications or equivalent substitutions that do not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A deep dehumidification air handling system based on a three-way pipe section, characterized in that, Includes cold source unit A and return air handling unit B; The return air handling unit B includes an air-to-air sensible heat recovery unit (9), and a solution regeneration device R, a surface cooler (10), a solution dehumidification device D, and a purification module connected in sequence; the surface cooler (10) is connected to the cold source unit A; The air-to-air sensible heat recovery unit (9) is divided into two parts. The first part is connected between the solution regeneration device R and the surface cooler (10), and the other part is connected between the solution dehumidification device D and the purification module. A three-way pipe section (11) is provided between the solution dehumidification device D and the air-to-air sensible heat recovery unit (9); The first port of the three-way pipe section (11) is connected to the air outlet of the solution dehumidification device D, and the second port is connected to the air inlet of the air-to-air sensible heat recovery unit (9), which is used to send the drier air portion of the air outlet of the solution dehumidification device D into the air-to-air sensible heat recovery unit (9); the third port is connected to the air inlet of the solution regeneration device R, which is used to separate the air with higher moisture content at the lower part of the air outlet of the solution dehumidification device D and send it to the front of the solution regeneration device R, where it is mixed with the inlet return air of the return air treatment unit B for the solution concentration and regeneration process. The cross-sectional area ratio of the second port to the third port of the tee section (11) is 7.5:2.5~9.0:1.

0.

2. The deep dehumidification air handling system based on a three-way pipe section according to claim 1, characterized in that, The cold source unit A includes a chiller (1) and a chilled water pump (2). The surface cooler (10) is provided with a cooling water inlet and a cooling water outlet. The cooling water inlet is connected to the chilled water pump (2), and the cooling water outlet is connected to the chiller (1).

3. The deep dehumidification air handling system based on a three-way pipe section according to claim 1, characterized in that, A circulation loop is provided between the solution regeneration device R and the solution dehumidification device D. The circulation loop includes a solution circulation pump (8), a condenser (5), an evaporator (7), and a compressor (4). The solution circulation pump (8) includes a first circulation pump located at the bottom of the solution regeneration device R and a second circulation pump located at the bottom of the solution dehumidification device D. The condenser (5), evaporator (7) and compressor (4) are connected in sequence to form a connection circuit; The condenser (5) is connected to the first circulation pump and the solution regeneration device R, and the evaporator (7) is connected to the second circulation pump and the solution dehumidification device D.

4. The deep dehumidification air handling system based on a three-way pipe section according to claim 3, characterized in that, A throttling valve (6) is also provided between the condenser (5) and the evaporator (7).

5. The deep dehumidification air handling system based on a three-way pipe section according to claim 3, characterized in that, A solution-solution heat recovery unit (3) is also provided between the solution regeneration device R and the solution dehumidification device D. The solution-solution heat recovery unit (3) is set on the circulation loop to adjust the outlet temperature of the two liquids and realize the recovery of cold and heat.

6. The deep dehumidification air handling system based on a three-way pipe section according to claim 1, characterized in that, The dehumidification device D contains a dehumidification solution.

7. The deep dehumidification air handling system based on a three-way pipe section according to claim 1, characterized in that, The purification module uses an air filter (12).

8. A deep dehumidification air treatment method based on a three-way pipe section according to any one of claims 1-7, characterized in that, Includes the following processes: The return air is first mixed with a small amount of air from the lower part of the solution dehumidification device D; the mixed air then passes through the solution regeneration device R to absorb the moisture in the solution, while simultaneously achieving the concentration and regeneration of the dehumidification solution. Subsequently, the regenerated outlet air passes through an air-to-air sensible heat recovery unit (9) and undergoes indirect heat exchange with the solution dehumidification outlet air to achieve cooling of the regenerated outlet air. The cooled air passes through the surface cooler (10) and undergoes heat exchange to achieve cooling and dehumidification of the air; The cooled air is then dehumidified in the solution dehumidification device D. The dehumidified air is then separated into two parts by a three-way pipe: a small portion of the air with higher moisture content in the lower section of the air outlet of the solution dehumidification device D is separated and sent to the solution regeneration device R, where it is mixed with the return air at the inlet of the return air treatment unit B for the solution concentration and regeneration process. The drier air portion at the upper part of the air outlet of the solution dehumidification device D is separated to the second port of the three-way pipe section (11), and indirectly exchanges heat with the air outlet of the solution regeneration device R through the air-to-air sensible heat recovery unit (9) to achieve reheating of the supply air and meet the processing requirements for the supply air temperature. Finally, the air after cascade dehumidification flows through the air filter (12) to meet the filtration requirements for the supplied air.

9. The deep dehumidification air treatment method based on a three-way pipe section according to claim 8, characterized in that, The specific process of concentrating and regenerating the dehumidifying solution is as follows: The circulating solution in the solution regeneration device R is heated by the condenser (5), which increases the partial pressure of water vapor on its surface. The solution is sprayed down from the top of the regeneration device R. During the downward flow, it comes into direct contact with the horizontally flowing return air. Mass transfer is achieved by utilizing the water vapor partial pressure difference between the gas and liquid. The water in the solution evaporates into the return air, thus achieving the concentration and regeneration of the solution. A portion of the concentrated and regenerated solution located at the bottom of the solution regeneration unit R is transported to the dehumidification side via an interstage flow pipeline. The circulating solution in the solution dehumidification device D is cooled by the evaporator (7) to reduce the partial pressure of water vapor on its surface. The solution is sprayed down from the top of the solution dehumidification device D. During the downward flow, it comes into direct contact with the horizontally flowing airflow. Mass transfer is achieved by utilizing the water vapor partial pressure difference between the gas and liquid, thus dehumidifying the air. After absorbing moisture, the concentration of the solution decreases and the moisture absorption capacity weakens. The dilute solution located at the bottom of the solution dehumidification device D is transported to the regeneration side through the interstage flow pipeline to achieve concentration and regeneration.

Images