A liquid dehumidification fresh air treatment system based on a dehumidification-evaporative cooling closed cycle

Abstract

The present invention discloses a solution dehumidification fresh air treatment system based on a dehumidification-evaporation cooling closed cycle, including a LiCl solution circulation loop, a chilled water circulation loop, an air circulation loop, and primary and secondary cooling water circulation loops. The system is provided with a cooling tower, a regenerator, a dehumidifier, an evaporator, a surface cooler, a water-solution heat exchanger, a fan, and various circulation pumps and regulating valves. The present invention utilizes the relatively high temperature outdoor air through the relatively high temperature cooling water produced by the primary cooling tower to cool the first dehumidifier inlet solution, and then dehumidifies the outdoor fresh air; utilizes the relatively low temperature cooling water produced by the secondary cooling tower through the indoor exhaust air with relatively low temperature and humidity to cool the second dehumidifier inlet solution, and the low temperature and low humidity air obtained by the second dehumidifier enters the evaporator to produce chilled water, and then is sent to the surface cooler to cool the dehumidified fresh air, thereby realizing efficient fresh air treatment that can simultaneously meet the temperature and humidity requirements.

Description

Technical Field

[0001] The present invention belongs to the technical field of refrigeration and air-conditioning system design and manufacturing, and in particular is a liquid dehumidification fresh air treatment system based on a dehumidification-evaporative cooling closed cycle. Background Art

[0002] With the rapid development of science and technology and the increasing diversification of building functions, while meeting people's requirements for indoor environmental comfort, energy shortages can no longer be ignored, and energy conservation has received universal attention from the world. In my country, building energy consumption currently accounts for a large part of the total energy consumption of the national economy, and is showing an increasing trend. Building energy conservation mainly includes two aspects: on the one hand, improving the thermal insulation performance of the envelope structure and reducing the heat loss of the envelope structure; on the other hand, improving the efficiency of the building's heating and air-conditioning systems and reducing the energy consumption of equipment. The current traditional air-conditioning system with independent temperature and humidity control combines a complete refrigeration system and a dehumidifier to cool and dehumidify the fresh air respectively. Although this can have the advantages of simple structure, optimized air quality, and increased utilization of low-grade energy to a certain extent, in order to achieve this goal, the preparation of low-temperature cold sources in the surface cooler inevitably requires the consumption of high-grade energy, which will undoubtedly cause energy waste and reduce the utilization of low-grade energy. Summary of the invention

[0003] In view of the above-mentioned prior art, the technical problem to be solved by the present invention is to reduce the energy demand of the traditional temperature and humidity independent control system and reduce energy waste, while making it easy to obtain a low-temperature cold source.

[0004] To achieve the above purpose, the technical solution adopted by the present invention is:

[0005] A solution dehumidification fresh air treatment system based on a dehumidification-evaporative cooling closed cycle, comprising a LiCl solution circulation loop, a chilled water circulation loop, a dehumidified air circulation loop, a regeneration air circulation loop, an evaporator internal air circulation loop, a primary cooling water circulation loop and a secondary cooling water circulation loop, wherein the LiCl solution circulation loop comprises a regenerator, a first dehumidifier and a second dehumidifier, the regeneration air circulation loop is connected to the regenerator, the evaporator internal air circulation loop is connected to the second dehumidifier, the primary cooling water circulation loop and the secondary cooling water circulation loop are respectively connected through a first water-solution heat exchanger and a second water-solution heat exchanger. The two water-solution heat exchangers are connected to the LiCl solution circulation loop; the cooling water in the primary cooling water circulation loop and the secondary cooling water circulation loop cools down the solutions at the inlets of the first dehumidifier and the second dehumidifier respectively; the fresh air from the outdoors is dehumidified by the first dehumidifier and then introduced into the dehumidified air circulation loop; the return air from the indoors is dehumidified by the second dehumidifier and then introduced into the evaporator of the air circulation loop in the evaporator to produce chilled water; the chilled water is sent to the surface cooler through the chilled water circulation loop to cool down the fresh air dehumidified by the first dehumidifier, thereby realizing efficient treatment of the temperature and humidity of the fresh air.

[0006] In the LiCl solution circulation loop: the solution outlet of the regenerator is connected to the solution inlets of the first water-solution heat exchanger and the second solution heat recovery device respectively through the first solution valve, the first solution pump, the first solution heat recovery device, the second solution valve, the first water-solution heat exchanger outlet is connected to the first dehumidifier inlet, the solution outlet of the second solution heat recovery device is connected to the second dehumidifier inlet through the second water-solution heat exchanger and the fifth solution valve, the solution outlet of the first dehumidifier is connected to the solution inlet of the third solution valve, the solution outlet of the second dehumidifier is connected to the solution inlet of the second solution heat recovery device through the fourth solution valve and the third solution pump, and the solution outlets of the third solution valve and the second solution heat recovery device are connected to the solution inlet of the solution regenerator through the second solution pump, the first solution heat recovery device, and the first hot water heater in order to complete the dehumidification cycle of the LiCl solution;

[0007] In the chilled water circulation loop: the chilled water outlet of the evaporator is connected to the chilled water inlet of the surface cooler through the seventh solution valve and the eighth solution valve in sequence. The chilled water outlet of the surface cooler is connected to the ninth solution valve, the sixth solution valve, and the chilled water inlet of the evaporator.

[0008] In the dehumidified air circulation loop: the air inlet of the first dehumidifier is connected to the fresh air, and the air outlet of the first dehumidifier is connected to the air inlet of the surface cooler so that the air completes the dehumidification cycle; the chilled water at the inlet of the surface cooler cools down the dehumidified fresh air to reach the required temperature and humidity in the room;

[0009] In the air circulation loop in the evaporator: the circulating air passes through the air duct and the evaporator from the outlet of the second dehumidifier, and then enters the air inlet of the second dehumidifier, completing a complete loop of the circulating air in the evaporator.

[0010] In the regeneration air circulation loop: outdoor air passes through the air duct, the first air heat recovery device, and the second fan in sequence, and then enters the regenerator. The air outlet of the regenerator is connected to the air duct through the first air heat recovery device, and waste heat air is discharged from the air duct to complete the primary circulation of the air;

[0011] In the primary cooling water circulation loop: the cooling water outlet of the primary cooling tower is connected to the cooling water inlet of the primary cooling tower through the first water valve, the first water pump, and the first water-solution heat exchanger in sequence, and the air inlet of the primary cooling tower is connected to the outdoor air through the fan;

[0012] In the secondary cooling water circulation loop: the cooling water outlet of the secondary cooling tower is connected to the cooling water inlet of the secondary cooling tower through the second water valve, the second water pump, and the second water-liquid heat exchanger in sequence, and the air inlet of the secondary cooling tower is connected to the fan and the indoor exhaust outlet in sequence.

[0013] Beneficial effects of the present invention:

[0014] 1. The present invention can firstly use a LiCl solution with a relatively high temperature and concentration to dehumidify the fresh air, remove the wet load of the high-temperature and high-humidity fresh air, and then use a dehumidification-evaporation cold source to cool the dehumidified fresh air, so as to achieve the purpose of simultaneously satisfying the temperature and humidity and providing low-temperature and low-humidity fresh air.

[0015] 2. The present invention can utilize indoor exhaust air with a lower temperature to produce low-temperature cooling water, so that a LiCl solution with a lower temperature can be obtained, thereby improving the dehumidification effect of the LiCl solution at the inlet of the dehumidifier 2, further obtaining chilled water with a lower temperature, and realizing temperature control of the fresh air after dehumidification in the surface cooler.

[0016] 3. The present invention provides a dehumidification-evaporative cooling closed-cycle solution dehumidification fresh air treatment system, which can greatly reduce the demand for high-grade energy and reduce energy waste compared with the traditional evaporative cooling refrigeration and air-conditioning system. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic structural diagram of a liquid dehumidification fresh air treatment system based on a dehumidification-evaporative cooling closed cycle proposed by the present invention.

[0018] Illustration: regenerator 1, first solution valve v-1, first solution pump p-1, first solution heat recovery device ss-1, second solution valve v-2, first dehumidifier 3, second dehumidifier 2, third solution valve v-3, second solution pump p-2, first hot water heater H1, second fan 8, air duct D, air duct E, first air heat recovery device aa-1, fourth solution valve v-4, fifth solution valve v-5, third solution pump p-3, second solution heat exchanger ss- 2, air duct A, evaporator 5, sixth solution valve z-1, seventh solution valve z-2, fourth solution pump p-4, air duct B, surface cooler 4, eighth solution valve B-1, ninth solution valve B-2, primary cooling tower 6, first water valve w-1, first water pump w-2, first water-solution heat exchanger sw-1, second fan 10, secondary cooling tower 7, second water valve w-3, second water pump w-4, second water-solution heat exchanger sw-2, third fan 9, air duct C. DETAILED DESCRIPTION

[0019] In order to better explain the present invention, the present invention is described in detail below with reference to the accompanying drawings and embodiments.

[0020] Example: See Figure 1 .

[0021] like Figure 1 The figure shows a schematic diagram of the structure of a solution dehumidification fresh air treatment system based on a dehumidification-evaporative cooling closed cycle of the present invention, including a LiCl solution circulation loop, a chilled water circulation loop, a dehumidified air circulation loop, a regeneration air circulation loop, an evaporator internal air circulation loop, a primary cooling water circulation loop and a secondary cooling water circulation loop, characterized in that: the LiCl solution circulation loop includes a regenerator 1, a first dehumidifier 3 and a second dehumidifier 2, the regeneration air circulation loop is connected to the regenerator 1, the evaporator internal air circulation loop is connected to the second dehumidifier 2, the primary cooling water circulation loop and the secondary cooling water circulation loop are respectively connected through the first water-solution heat exchange The heat exchanger sw-1 and the second water-solution heat exchanger sw-2 are connected to the LiCl solution circulation loop; the cooling water in the primary cooling water circulation loop and the secondary cooling water circulation loop cools down the solutions at the inlets of the first dehumidifier 3 and the second dehumidifier 2 respectively; the fresh air from the outdoors is dehumidified by the first dehumidifier 3 and then introduced into the dehumidified air circulation loop; the return air from the indoors is dehumidified by the second dehumidifier 2 and then introduced into the evaporator 5 of the air circulation loop in the evaporator to produce chilled water; the chilled water is sent into the surface cooler through the chilled water circulation loop to cool down the fresh air dehumidified by the first dehumidifier 3, thereby realizing efficient treatment of the temperature and humidity of the fresh air.

[0022] In the LiCl solution circulation loop: the solution outlet of the regenerator 1 is connected to the solution inlet of the first water-solution heat exchanger sw-1 and the second solution heat recovery device ss-2 respectively through the first solution valve v-1, the first solution pump p-1, the first solution heat recovery device ss-1, the second solution valve v-2, the outlet of the first water-solution heat exchanger sw-1 is connected to the inlet of the first dehumidifier 3, the solution outlet of the second solution heat recovery device ss-2 is connected to the second water-solution heat exchanger sw-2, the fifth solution valve v-5, the second dehumidifier The inlet of the dehumidifier 2 is connected, the solution outlet of the first dehumidifier 3 is connected to the solution inlet of the third solution valve v-3, the solution outlet of the second dehumidifier 2 is connected to the solution inlet of the second solution heat recovery device ss-2 through the fourth solution valve v-4 and the third solution pump p-3, and the solution outlets of the third solution valve v-3 and the second solution heat recovery device ss-2 are connected to the solution inlet of the regenerator 1 through the second solution pump p-2, the first solution heat recovery device ss-1, and the first hot water heater H1 in sequence to complete the dehumidification cycle of the LiCl solution;

[0023] In the chilled water circulation loop: the chilled water outlet of the evaporator 5 is connected to the chilled water inlet of the surface cooler 4 through the seventh solution valve z-2, the eighth solution valve B-1 in sequence. The chilled water outlet of the surface cooler 4 is connected to the ninth solution valve B-2, the sixth solution valve z-1, and the chilled water inlet of the evaporator 5, completing the cycle of cooling the fresh air after dehumidification;

[0024] In the dehumidified air circulation loop: the air inlet of the first dehumidifier 3 is connected to the fresh air, and the air outlet of the first dehumidifier 3 is connected to the air inlet of the surface cooler 4 so that the air completes the dehumidification cycle; the chilled water at the inlet of the surface cooler 4 cools the dehumidified fresh air to reach the required temperature and humidity in the room, and then delivers it into the room;

[0025] In the evaporative cooling air circulation loop: the circulating air passes from the dehumidifier outlet through the air duct A, the evaporator, and then enters the dehumidifier air inlet, completing a complete loop of circulating air in the evaporator;

[0026] In the regeneration air circulation loop: outdoor air passes through the air duct E, the first air heat recovery device aa-1, and the second fan 8 in sequence, and then enters the regenerator 1. The air outlet of the regenerator 1 is connected to the air duct D through the first air heat recovery device aa-1, and the waste heat air is discharged from the air duct D to complete the air circulation;

[0027] In the primary cooling water circulation loop: the cooling water outlet of the primary cooling tower 1 is connected to the cooling water inlet of the primary cooling tower 1 through the first water valve w-1, the first water pump w-2, and the first water-solution heat exchanger sw-1 in sequence, and the air inlet of the primary cooling tower 1 is connected to the outdoor air through the fan;

[0028] In the secondary cooling water circulation loop: the cooling water outlet of the secondary cooling tower 7 is connected to the cooling water inlet of the secondary cooling tower 9 through the second water valve w-3, the second water pump w-4, and the second water-liquid heat exchanger sw-2 in sequence, and the air inlet of the secondary cooling tower 7 is connected to the fan and the indoor exhaust outlet in sequence.

[0029] The working principle of the present invention is as follows:

[0030] In the LiCl solution circulation loop, the concentrated LiCl solution from the bottom of the regenerator 1 can first pass through the first solution heat recovery device ss-1 to exchange heat with the dilute LiCl solution from the bottom of the first dehumidifier 3 and the second dehumidifier 2, so that the temperature of the LiCl solution is reduced. A part of the LiCl solution then passes through the first water-solution heat exchanger sw-1 to exchange heat with the cooling water from the primary cooling tower 6, so that the temperature of the LiCl solution is further reduced, and then enters the first dehumidifier 3. After two coolings, the LiCl solution in the first dehumidifier 3 can have a better dehumidification effect on the fresh air; another part of the LiCl solution passes through the first solution heat recovery device ss-2 to exchange heat with the dilute LiCl solution from the bottom of the second dehumidifier 2, so that the temperature of the LiCl solution is further reduced, and then passes through the second water-solution heat exchanger sw-2 to exchange heat with the cooling water from the secondary cooling tower 7, so that the temperature of the LiCl solution is further reduced, and finally enters the second dehumidifier 2. After three coolings, the LiCl solution in the second dehumidifier 2 can have a better dehumidification effect on the circulating air in the evaporator, indirectly obtain lower temperature chilled water, and better control the temperature of the fresh air after dehumidification. The dilute LiCl solution after dehumidification by the second dehumidifier 2 first passes through the second heat recovery device ss-2 for heat exchange and then mixes with the dilute LiCl solution at the outlet of the first dehumidifier 3. The two are initially heated in the heat recovery device ss-1 and then enter the first hot water heater H1 for heat exchange. After multiple heating, the regeneration capacity of the LiCl solution can be improved; the heated LiCl solution finally enters the regenerator 1 to exchange heat and mass with the regenerated air in the air circulation loop to become a concentrated LiCl solution, completing the LiCl solution cycle. In this process, since the cooling water from the first-level cooling tower 6 exchanges heat with the outdoor air with a higher temperature, and the cooling water from the second-level cooling tower 7 exchanges heat with the indoor exhaust air with a lower temperature, the temperature of the cooling water from the second-level cooling tower 7 is lower than that of the cooling water from the first-level cooling tower 6, so that the solution temperature of the second dehumidifier 2 can be lower than that of the first dehumidifier 3, so that the second dehumidifier 2 has better dehumidification capacity than the first dehumidifier 3, so that low-grade energy can be used to produce a low-temperature cold source to cool the fresh air after dehumidification under the premise of meeting the dehumidification demand.

[0031] In the air circulation loop on the regenerator side, the outdoor air in the air circulation loop can enter the regenerator 1 for heat exchange and mass transfer with the dilute LiCl solution in the regenerator 1 after heat exchange and temperature increase through the first air heat recovery device aa-1, and then the waste hot air is discharged from the regenerator 1 to realize the circulation of the regenerated air.

[0032] In the air circulation loop on the dehumidifier side, the fresh air can enter the first dehumidifier 3 to exchange heat and mass with the LiCl concentrated solution in the first dehumidifier 3 to remove the humidity of the fresh air, and then enter the surface cooler 4 to exchange heat with the low-temperature chilled water from the evaporator 5 to reduce the temperature of the fresh air after dehumidification, and finally send the low-temperature and low-humidity fresh air into the room.

[0033] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structure or equivalent transformation made by using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A solution dehumidification fresh air treatment system based on a dehumidification-evaporative cooling closed cycle, comprising a LiCl solution circulation loop, a chilled water circulation loop, a dehumidified air circulation loop, a regeneration air circulation loop, an evaporator air circulation loop, a primary cooling water circulation loop and a secondary cooling water circulation loop, characterized in that: The LiCl solution circulation loop comprises a regenerator (1), a first dehumidifier (3) and a second dehumidifier (2); the regeneration air circulation loop is connected to the regenerator (1); the evaporator internal air circulation loop is connected to the second dehumidifier (2); the primary cooling water circulation loop and the secondary cooling water circulation loop are connected to the LiCl solution circulation loop via a first water-solution heat exchanger (sw-1) and a second water-solution heat exchanger (sw-2), respectively; the primary cooling water circulation loop and the secondary cooling water circulation loop are connected to the LiCl solution circulation loop via a first water-solution heat exchanger (sw-1) and a second water-solution heat exchanger (sw-2), respectively; The cooling water in the air cools down the solution at the inlet of the first dehumidifier (3) and the second dehumidifier (2) respectively; the fresh air from the outside is dehumidified by the first dehumidifier (3) and then introduced into the dehumidified air circulation loop; the return air from the room is dehumidified by the second dehumidifier (2) and then introduced into the evaporator (5) of the air circulation loop in the evaporator to produce chilled water; the chilled water is sent to the surface cooler through the chilled water circulation loop to cool down the fresh air dehumidified by the first dehumidifier (3), thereby realizing efficient treatment of the temperature and humidity of the fresh air; In the LiCl solution circulation loop: the solution outlet of the regenerator (1) is connected to the solution inlets of the first water-solution heat exchanger (sw-1) and the second solution heat recovery device (ss-2) respectively through the first solution valve (v-1), the first solution pump (p-1), the first solution heat recovery device (ss-1), the second solution valve (v-2), the outlet of the first water-solution heat exchanger (sw-1) is connected to the inlet of the first dehumidifier (3), the solution outlet of the second solution heat recovery device (ss-2) is connected to the inlet of the second dehumidifier (3) through the second water-solution heat exchanger (sw-2), the fifth solution valve (v-5), the outlet of the first water-solution heat exchanger (sw-1) is connected to the inlet of the first dehumidifier (3), and the outlet of the second solution heat recovery device (ss-2) is connected to the inlet of the second dehumidifier (3). The solution outlet of the first dehumidifier (3) is connected to the solution inlet of the third solution valve (v-3), the solution outlet of the second dehumidifier (2) is connected to the solution inlet of the second solution heat recovery device (ss-2) through the fourth solution valve (v-4) and the third solution pump (p-3), and the solution outlets of the third solution valve (v-3) and the second solution heat recovery device (ss-2) are connected to the solution inlet of the regenerator (1) through the second solution pump (p-2), the first solution heat recovery device (ss-1), and the first hot water heater (H1) in sequence so that the LiCl solution completes the dehumidification cycle; In the chilled water circulation loop: the chilled water outlet of the evaporator (5) is connected to the chilled water inlet of the surface cooler (4) through the seventh solution valve (z-2), the eighth solution valve (B-1) in sequence; the chilled water outlet of the surface cooler (4) is connected to the ninth solution valve (B-2), the sixth solution valve (z-1), and the chilled water inlet of the evaporator (5); In the dehumidified air circulation loop: the air inlet of the first dehumidifier (3) is connected to the fresh air, and the air outlet of the first dehumidifier (3) is connected to the air inlet of the surface cooler (4) so ​​that the air completes the dehumidification cycle; the chilled water at the inlet of the surface cooler (4) cools the dehumidified fresh air to achieve the required temperature and humidity in the room.

2. A liquid dehumidification fresh air treatment system based on a dehumidification-evaporative cooling closed cycle according to claim 1, characterized in that: The air circulation loop in the evaporator: the circulating air passes through the air duct A and the evaporator (5) from the outlet of the second dehumidifier (2) and then enters the air inlet of the second dehumidifier (2), thus completing the entire air circulation loop in the evaporator.

3. A liquid dehumidification fresh air treatment system based on a dehumidification-evaporative cooling closed cycle according to claim 1, characterized in that: In the regeneration air circulation loop, outdoor air passes through the air duct E, the first air heat recovery device (aa-1), and the second fan (8) in sequence before entering the regenerator (1). The air outlet of the regenerator (1) is connected to the air duct D through the first air heat recovery device (aa-1) and waste heat air is discharged from the air duct D to complete the air circulation.

4. A liquid dehumidification fresh air treatment system based on a dehumidification-evaporative cooling closed cycle according to claim 1, characterized in that: In the primary cooling water circulation loop: the cooling water outlet of the primary cooling tower (6) is connected to the cooling water inlet of the primary cooling tower (6) through a first water valve (w-1), a first water pump (w-2), and a first water-liquid heat exchanger (sw-1) in sequence, and the air inlet of the primary cooling tower (6) is connected to outdoor air through a fan.

5. A liquid dehumidification fresh air treatment system based on a dehumidification-evaporative cooling closed cycle according to claim 1, characterized in that: In the secondary cooling water circulation loop: the cooling water outlet of the secondary cooling tower (7) is connected to the cooling water inlet of the secondary cooling tower (7) through the second water valve (w-3), the second water pump (w-4), and the second water-liquid heat exchanger (sw-2) in sequence, and the air inlet of the secondary cooling tower (7) is connected to the fan and the indoor exhaust outlet in sequence.

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