CN108954575B - Multistage dew point evaporative cooling dehumidification system based on vacuum membrane distillation regeneration - Google Patents

Multistage dew point evaporative cooling dehumidification system based on vacuum membrane distillation regeneration Download PDF

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CN108954575B
CN108954575B CN201810469089.4A CN201810469089A CN108954575B CN 108954575 B CN108954575 B CN 108954575B CN 201810469089 A CN201810469089 A CN 201810469089A CN 108954575 B CN108954575 B CN 108954575B
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solution
air
evaporative cooling
dehumidification
channel
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CN108954575A (en
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周君明
张小松
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Southeast University
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Southeast University
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24FAIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F3/00Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems
    • F24F3/12Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the treatment of the air otherwise than by heating and cooling
    • F24F3/14Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the treatment of the air otherwise than by heating and cooling by humidification; by dehumidification
    • F24F3/1411Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the treatment of the air otherwise than by heating and cooling by humidification; by dehumidification by absorbing or adsorbing water, e.g. using an hygroscopic desiccant
    • F24F3/1417Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the treatment of the air otherwise than by heating and cooling by humidification; by dehumidification by absorbing or adsorbing water, e.g. using an hygroscopic desiccant with liquid hygroscopic desiccants
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24FAIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F3/00Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems
    • F24F3/12Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the treatment of the air otherwise than by heating and cooling
    • F24F3/14Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the treatment of the air otherwise than by heating and cooling by humidification; by dehumidification
    • F24F2003/1458Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the treatment of the air otherwise than by heating and cooling by humidification; by dehumidification using regenerators

Abstract

The invention discloses a multistage dew point evaporative cooling dehumidification system based on vacuum membrane distillation regeneration, which belongs to the technical field of solution dehumidification systems and comprises a solar photovoltaic/thermal module, a solution vacuum membrane distillation regeneration module, a multistage dew point evaporative cooling dehumidification module and a latent heat recovery module which are connected with one another. The invention also discloses a regeneration and dehumidification method thereof. The invention utilizes the solar photovoltaic/thermal component to convert solar radiation energy into heat energy and electric energy which are both used as driving energy for solution regeneration. When regeneration is needed, the heated dilute solution is sent into a reduced pressure membrane distillation regenerator, and the solution is regenerated by utilizing the selective permeability of a hydrophobic membrane; when the air is required to be dehumidified, the concentrated solution is sent into the multi-stage dew point evaporative cooling dehumidifier to dehumidify and cool the processed air, so that the temperature and humidity of the air are adjusted. The multistage dew point evaporative cooling technology and the dehumidification technology are organically combined, so that the dehumidification efficiency and the refrigeration efficiency of the system are effectively improved.

Description

Multistage dew point evaporative cooling dehumidification system based on vacuum membrane distillation regeneration
Technical Field
The invention belongs to the technical field of solution dehumidification systems, and particularly relates to a multistage dew point evaporative cooling dehumidification system and method based on vacuum membrane distillation regeneration.
Background
Solution dehumidification technology is becoming more and more interesting because of its efficient use of low grade heat and its high dehumidification efficiency. Compared with the conventional air conditioner, the solution dehumidification air conditioner has better air dehumidification, can effectively purify air, has no pollution to the environment and low power consumption, and the salt solution can also realize high-density energy storage, which is up to 1300 plus 1400MJ/m3The storage capacity of the ice storage device is 3-4 times higher than that of the traditional ice storage, and measures such as heat preservation are not needed.
Solar energy is taken as a renewable energy source which utilizes freedom, environmental protection and cleanness, the combination of solar energy and solution dehumidification is an important solution for relieving the energy consumption and the environmental problem of an air conditioner, and solution regeneration by utilizing solar energy becomes a research hotspot in recent years. However, the conventional solution regeneration method depends heavily on the conditions of the surrounding environment, and the regeneration effect cannot meet the dehumidification requirement under the high-temperature or high-humidity climate condition. Therefore, in order to ensure the stability of the operation of the solar solution regeneration system in high-temperature and high-humidity weather, a new regeneration process is needed to be found.
On the other hand, evaporative cooling has the advantages of environmental protection and energy saving as a refrigeration technology for acquiring cold energy from nature. The principle and operation of the traditional direct evaporative cooling technology are very simple, but the traditional direct evaporative cooling technology inevitably has the following defects: the humidity of the air after direct evaporative cooling is increased, so that the cooled air hardly meets the air supply condition; the indirect evaporative cooling can avoid the humidity rise of the supplied air, but the cooling effect is not large and is influenced by the temperature of the wet air bulb; and the evaporative cooling effect is poor in both direct evaporative cooling and indirect evaporative cooling in high-temperature and high-humidity areas. Therefore, an effective combination of dew point evaporative cooling with solution dehumidification would likely facilitate the use of evaporative cooling in hot and humid areas.
Disclosure of Invention
In order to solve the problems, the invention discloses a multistage dew point evaporative cooling dehumidification system based on vacuum membrane distillation regeneration, which is suitable for dehumidifying and cooling air in hot and humid areas; in order to realize the comprehensive utilization of solar energy, the development of a solution dehumidification air-conditioning system is expected to be further promoted by adopting a solar photovoltaic/thermal (PV/T) technology for driving. The invention also aims to provide a regeneration and dehumidification method thereof.
In order to achieve the purpose, the invention adopts the following technical scheme:
the multistage dew point evaporative cooling dehumidification system based on vacuum membrane distillation regeneration comprises a solar PV/T assembly, wherein the solar PV/T assembly introduces generated current into a storage battery for storage, and the storage battery is respectively connected with a circulating solution pump and a vacuum pump. The solution outlet of the solar PV/T assembly is connected with the inlet of the circulating solution pump, and the solution inlet of the solar PV/T assembly is connected with the tube side outlet of the condenser; the outlet of the circulating solution pump is connected with the tube pass inlet of the reduced pressure membrane distillation regenerator, the tube pass outlet of the reduced pressure membrane distillation regenerator is connected with the shell pass inlet of the heat exchanger, and the shell pass outlet of the reduced pressure membrane distillation regenerator is connected with the shell pass inlet of the condenser; the heat exchanger shell pass export link to each other with the entry of concentrated solution liquid storage pot, the exit linkage spray set above the multistage dew point evaporative cooling dehumidifier of concentrated solution liquid storage pot, the export of multistage dew point evaporative cooling dehumidifier be connected with the entry linkage of weak solution pump, the exit linkage of weak solution pump weak solution liquid storage pot's entry, the export of weak solution liquid storage pot links to each other with heat exchanger's tube side entry, heat exchanger's tube side exit linkage condenser's tube side entry.
The multistage dew-point evaporative cooling dehumidifier is formed by axisymmetric periodic arrangement of three-stage dew-point evaporative cooling dehumidifiers, wherein a heat recoverer, a dry channel and a wet channel in each stage of dew-point evaporative cooling dehumidifier are circularly connected, and are distributed by taking an air supply channel as an axisymmetric distribution.
And the shell side outlet of the condenser is connected with the inlet of a gas-liquid separator, and the outlet of the gas-liquid separator is respectively connected with a vacuum pump and a water receiver.
The method for dehumidifying by using the multistage dew point evaporative cooling dehumidification system based on vacuum membrane distillation regeneration comprises the following steps:
1) and starting a concentrated solution pump, starting the solution dehumidifying module, and enabling the concentrated solution to flow into a spraying device above an air supply channel in the multi-stage dew-point evaporative cooling dehumidifier from the concentrated solution storage tank. And starting a water pump, and sending tap water to a spraying device above a wet channel in the multistage dew-point evaporative cooling dehumidifier by the water pump.
2) And starting a fan, sending outdoor fresh air into an inlet of the multistage dew-point evaporative cooling dehumidifier by the fan, and respectively entering the heat recoverer and the air supply channel. And sending the pre-cooled primary air in the heat recoverer into the dry channel, and cooling the primary air by the low-temperature wall surface in the dry channel. The cooled air enters the wet channel from the gap at the tail end of the dry channel to become secondary air. The secondary air is evaporated and cooled in the wet channel to take away the heat on the surface of the channel, and the evaporated and cooled secondary air enters a heat recoverer to pre-cool the primary air. The secondary air is sent into the return air channel and is discharged out of the dehumidifier. The wet channel is adjacent to the dry channel and the air supply channel at the same time, and after secondary air in the wet channel is evaporated and cooled, the two side wall surfaces of the channel can be cooled at the same time, so that primary air is cooled, heat dissipated in the solution dehumidification process is taken away, and the dehumidification efficiency is improved;
3) outdoor fresh air enters the air supply channel, and fresh air flows from bottom to top. In addition, the concentrated solution pump sends the concentrated solution to a spraying device above the dew point evaporative cooling dehumidifier, the concentrated solution flows into an air supply channel from top to bottom along the wall surface, the air and the solution carry out heat-mass exchange, heat generated in the dehumidification process is taken away by the wall surface of a wet channel, and the air flows into the next dew point evaporative cooling dehumidifier after being dehumidified and cooled. The concentrated solution is changed into a dilute solution after absorbing the moisture, and the dilute solution is pumped into a dilute solution storage tank for storage;
the primary air in the dry channel in the second-stage dew-point evaporative cooling dehumidifier is air which is dehumidified and cooled in the upper-stage air supply channel, and the primary air with lower temperature and humidity enables the second-stage dew-point evaporative cooling dehumidifier to have better dehumidification and cooling effects. The multistage dew point evaporative cooling dehumidifier provides powerful conditions for evaporative cooling treatment of fresh air, the evaporative cooling process is less affected by outdoor climatic conditions, the refrigeration efficiency of the system is improved in multiple stages, and the air humidity and temperature sent out by the air supply channel are lower.
The method for regenerating by using the multistage dew point evaporative cooling dehumidification system based on vacuum membrane distillation regeneration comprises the following steps:
1) the solar PV/T module is started, the solar PV/T assembly converts solar radiation energy into electric energy and heat energy respectively, and the generated electric energy is stored in the storage battery and used for driving the circulating solution pump and the vacuum pump. Starting a circulating solution pump, and enabling the dilute solution to flow into a solution channel of the solar PV/T assembly; starting a vacuum pump, starting a solution reduced pressure membrane distillation regeneration module, enabling a dilute solution with higher temperature after the solar PV/T assembly is heated to flow into a tube pass of a reduced pressure membrane distillation regenerator, creating a negative pressure environment in a shell pass of the reduced pressure membrane distillation regenerator by the vacuum pump, increasing the partial pressure difference of water vapor on two sides of a membrane assembly, vaporizing the moisture in the dilute solution on the inner side of the membrane, diffusing the generated water vapor to a vacuum side through a membrane hole, increasing the concentration of a concentrated solution after the solution passes through the reduced pressure membrane distillation regenerator, and enabling a high-concentration solution to flow into a concentrated solution storage tank for storage after the solution is cooled by a heat exchanger;
2) during circulating solution pump and vacuum pump, latent heat recovery module also opens, dilute solution flows out from dilute solution liquid storage pot, preheat through heat exchanger, dilute solution after preheating flows into in the tube side of condenser, the vacuum pump makes the vapor that produces among the vacuum membrane distillation regenerator flow into the shell side of condenser, vapor condenses in the condenser shell side, condensate water and air flow equalize and separate in the income vapour and liquid separator, the air is discharged by the vacuum pump, the condensate water flows into the water storage tank and collects, dilute solution is heated to the latent energy of condensation release, dilute solution after the temperature risees flows into further heating and rising in the solar energy PV/T subassembly, form the endless process of solution.
The invention principle is as follows: the device comprises a solar PV/T module, a solution film distillation regeneration module, a latent heat recovery module and a multi-stage dew point evaporation cooling dehumidification module which are connected with one another; the solar PV/T module comprises a solar PV/T assembly connected with the condenser, a storage battery and a solution circulating pump connected with the storage battery; the solution decompression membrane distillation regeneration module comprises a decompression membrane distillation regenerator connected with the solution circulating pump, a heat exchanger connected with the decompression membrane distillation regenerator, and a concentrated solution storage tank connected with the heat exchanger; the multi-stage dew-point evaporative cooling dehumidification module comprises a concentrated solution pump connected with the concentrated solution storage tank, a multi-stage dew-point evaporative cooling dehumidifier connected with the concentrated solution pump, a dilute solution pump connected with the multi-stage dew-point evaporative cooling dehumidifier, a dilute solution storage tank connected with the dilute solution pump, and a heat exchanger; the multistage dew-point evaporative cooling dehumidifier is formed by axisymmetric periodic arrangement of three-stage dew-point evaporative cooling dehumidifiers, wherein a heat recoverer, a dry channel and a wet channel in each stage of dew-point evaporative cooling dehumidifier are circularly connected, and are distributed by taking an air supply channel as an axisymmetric distribution. The latent heat recovery module comprises a condenser connected with the heat exchanger, a gas-liquid separator connected with the condenser, a vacuum pump connected with the gas-liquid separator, and a water storage tank. The invention adopts the PV/T component to comprehensively utilize solar energy photo-heat and photovoltaic, and respectively converts solar radiation energy into heat energy and electric energy to be used as driving energy for solution regeneration. The solar PV/T module introduces the generated current into a storage battery for storage, and the electric energy is used for driving a circulating solution pump and a vacuum pump. Utilize solution passageway to be arranged in the heating to treat regenerated dilute solution among the solar energy PV/T subassembly, adopt decompression membrane distillation regenerator to concentrate the regeneration to dilute solution, concentrate solution after the regeneration and dilute solution heat transfer cooling back flow in the concentrated solution liquid storage pot and store, realize the energy storage of solution, solar energy discontinuity is overcome to the high density energy storage performance of salt solution, when needing the air dehumidification, concentrate is sent into in the multistage dew point evaporative cooling dehumidifier, utilize dew point evaporative cooling technique and dehumidification technique to dehumidify the cooling to the air, realize the temperature humidity control of air.
Has the advantages that: compared with the prior art, the invention adopts the PV/T component to comprehensively utilize solar energy photo-heat and photovoltaic, and respectively converts solar radiation energy into heat energy and electric energy to be used as driving energy for solution regeneration. The solar PV/T assembly heats the dilute solution to be regenerated, improves the water vapor partial pressure of the solution, effectively utilizes renewable energy as the driving force of the system, and makes a contribution to relieving the energy consumption problem and the environmental problem of the air-conditioning system; the introduction of the membrane regeneration technology effectively avoids the risk of carrying liquid in the solution regeneration process and reduces the pollution of the salt solution to the surrounding environment; a vacuum pump is utilized to create a negative pressure environment, so that the partial pressure difference of water vapor on two sides of the membrane component is increased, the membrane flux of the water vapor is increased, and the regeneration effect of the membrane component is enhanced; the pressure reduction membrane distillation regeneration technology is not influenced by the ambient air environment any more, the problem of poor effect on the regeneration process in a high-temperature and high-humidity climate state is effectively solved, and the solution regeneration effect is obvious in a hot and humid climate; and the multistage dew point evaporative cooling technology and the dehumidification technology are organically combined, so that the influence of outdoor climate conditions on the evaporative cooling process is small, the refrigeration efficiency and the dehumidification efficiency of the system are improved in multiple stages, and the humidity and the temperature of air sent out by the air supply channel are lower. In the regeneration method, the PV/T assembly converts solar radiation energy into heat energy and electric energy respectively to be used as driving energy for solution regeneration. The latent heat recovery technology is reasonably utilized, and the latent heat of the water vapor distilled by the decompression membrane is recovered and used for preheating the dilute solution, so that the regeneration effect of the dilute solution is enhanced, and the energy utilization efficiency is improved; the regenerated concentrated solution is stored in the concentrated solution storage tank, and the huge energy storage characteristic of the salt solution can make up the problems of low solar energy density, intermittence, instability and the like. The dehumidification method organically combines the dew point evaporative cooling technology and the dehumidification technology, and the pre-cooled primary air in the heat recoverer is sent into the dry channel and is cooled by the low-temperature wall surface in the dry channel. The secondary air is subjected to evaporative cooling in the wet channels to remove heat from the surfaces of the channels. After the secondary air in the wet channel is evaporated and cooled, the two side wall surfaces of the channel can be cooled simultaneously, so that the primary air is cooled, the heat emitted in the solution dehumidification process is taken away, and the dehumidification efficiency is improved; and the multistage processing mode ensures that the dew point evaporative cooling process is less influenced by outdoor environment parameters, and improves the refrigeration efficiency of the system.
Drawings
FIG. 1 is a schematic diagram of a multistage dew point evaporative cooling dehumidification system based on vacuum membrane distillation regeneration.
FIG. 2 is a detailed view of a multi-stage dew point evaporative cooling dehumidifier.
List of reference numerals:
the solar PV/T module I, the solution decompression membrane distillation regeneration module II, the multi-stage dew point evaporative cooling dehumidification module III, the latent heat recovery module IV, the solar PV/T component 1, the storage battery 2, the circulating solution pump 3, the decompression membrane distillation regenerator 4, the heat exchanger 5, the concentrated solution storage tank 6, the concentrated solution pump 7, the dehumidifier 8, the dilute solution pump 9, the dilute solution storage tank 10, the condenser 11, the gas-liquid separator 12, the water storage tank 13, the vacuum pump 14, the water pump 15, the fan 16, the heat recoverer 17, the dry channel 18, the wet channel 19, the air supply channel 20 and the air return channel 21.
Detailed Description
The present invention will be further illustrated with reference to the accompanying drawings and specific embodiments, which are to be understood as merely illustrative of the invention and not as limiting the scope of the invention. It should be noted that the terms "front," "back," "left," "right," "upper" and "lower" used in the following description refer to directions in the drawings, and the terms "inner" and "outer" refer to directions toward and away from, respectively, the geometric center of a particular component.
The multistage dew point evaporative cooling dehumidification system based on vacuum membrane distillation regeneration comprises a solar PV/T module I, a solution vacuum membrane distillation regeneration module II, a multistage dew point evaporative cooling dehumidification module III and a latent heat recovery module IV which are connected with one another; the specific connection mode is as follows: the solar PV/T module I comprises a solar PV/T assembly 1 and a circulating solution pump 3 connected with the solar PV/T assembly 1, wherein an outlet of the solar PV/T assembly 1 is connected with an inlet of the circulating solution pump 3, an inlet of the solar PV/T assembly 1 is connected with a tube side outlet (solution outlet) of a condenser 11, and an outlet of the circulating solution pump 3 is connected with a tube side inlet (solution inlet) of a reduced pressure membrane distillation regenerator 4.
The solution reduced-pressure membrane distillation regeneration module II comprises a reduced-pressure membrane distillation regenerator 4 connected with the circulating solution pump 3, a heat exchanger 5 connected with the reduced-pressure membrane distillation regenerator 4, and a concentrated solution storage tank 6 connected with the heat exchanger 5. The tube side outlet (solution outlet) of the pressure reduction membrane distillation regenerator 4 is connected with the shell side inlet of the heat exchanger 5, the shell side outlet (air outlet) of the pressure reduction membrane distillation regenerator 4 is connected with the shell side inlet (air inlet) of the condenser 11, and the shell side outlet of the heat exchanger 5 is connected with the inlet of the concentrated solution storage tank 6.
The multistage dew point evaporative cooling dehumidification module III comprises a concentrated solution pump 7 connected with a concentrated solution storage tank 6, a multistage dew point evaporative cooling dehumidifier 8 connected with the concentrated solution pump 7, and a dilute solution pump 9 connected with the multistage dew point evaporative cooling dehumidifier 8. The outlet of the concentrated solution storage tank 6 is connected with a spraying device above the multi-stage dew point evaporative cooling dehumidifier 8, the outlet of the multi-stage dew point evaporative cooling dehumidifier 8 is connected with the inlet of the dilute solution pump 9, the outlet of the dilute solution pump 9 is connected with the inlet of the dilute storage tank 10, and the outlet of the dilute storage tank 10 is connected with the tube side inlet of the heat exchanger 5. The multistage dew-point evaporative cooling dehumidifier 8 is composed of three stages of dew-point evaporative cooling dehumidifiers which are arranged in an axisymmetric periodic manner, wherein a heat recoverer 17, a dry channel 18 and a wet channel 19 in each stage of dew-point evaporative cooling dehumidifier are circularly connected and are distributed in an axisymmetric manner by taking an air supply channel 20 as an axis.
The latent heat recovery module iv includes a condenser 11 connected to the heat exchanger 5, a gas-liquid separator 12 connected to the condenser 11, and a vacuum pump 14 and a water storage tank 13 connected to the gas-liquid separator 12. The tube side outlet of the heat exchanger 5 is connected with the tube side inlet (solution inlet) of the condenser 11, the tube side outlet (solution outlet) of the condenser 11 is connected with the inlet of the solar PV/T assembly 1, the shell side outlet of the condenser 11 is connected with the inlet of the gas-liquid separator 12, and the outlet of the gas-liquid separator 12 is respectively connected with the vacuum pump 14 and the water storage device 13.
The method for dehumidifying by using the multistage dew point evaporative cooling dehumidification system based on vacuum membrane distillation regeneration comprises the following steps:
1) and starting a fan 16, sending outdoor fresh air into an inlet of the multi-stage dew-point evaporative cooling dehumidifier 8 by the fan 16, and respectively entering the heat recoverer 17 and the air supply channel 20. The primary air precooled in the heat recovery unit 17 is sent into the dry channel 18, and the primary air is cooled by the low-temperature wall surface in the dry channel 18. The cooled air enters the wet channel 19 from the gap at the end of the dry channel 18 to become secondary air. The secondary air is evaporated and cooled in the wet channel 19 to take away the heat on the surface of the channel, and the evaporated and cooled secondary air enters the heat recoverer 17 to pre-cool the primary air. The secondary air is sent into the return air passage 21 and discharged out of the dehumidifier. The wet channel 19 is adjacent to the dry channel 18 and the air supply channel 20 at the same time, and after the secondary air in the wet channel 19 is evaporated and cooled, the two side wall surfaces of the channel can be cooled at the same time, so that the primary air is cooled, the heat emitted in the solution dehumidification process is taken away, and the dehumidification efficiency is improved;
2) outdoor fresh air enters the air supply channel 20, and fresh air flows from bottom to top. In addition, the concentrated solution pump 7 sends the concentrated solution to a spraying device above the dew point evaporative cooling dehumidifier 8, the concentrated solution flows into an air supply channel 20 from top to bottom along the wall surface, the air and the solution carry out heat and mass exchange, heat generated in the dehumidification process is taken away by the wall surface of a wet channel 19, and the air flows into the next dew point evaporative cooling dehumidification stage after being dehumidified and cooled. The concentrated solution is changed into dilute solution after absorbing moisture and is sent into a dilute solution storage tank 10 by a dilute solution pump 9 for storage;
the primary air in the dry channel 18 of the second-stage dew-point evaporative cooling dehumidifier is air dehumidified and cooled in the upper-stage air supply channel 20, and the primary air with lower temperature and humidity enables the second-stage dew-point evaporative cooling dehumidifier to have better dehumidification and cooling effects. The multistage dew point evaporative cooling dehumidifier 8 provides powerful conditions for evaporative cooling processing fresh air, the evaporative cooling process is less influenced by outdoor climatic conditions, the refrigeration efficiency of the system is improved in multiple stages, and the air humidity and temperature sent by the air supply channel 20 are lower.
The method for regenerating by using the multistage dew point evaporative cooling dehumidification system based on the vacuum membrane distillation regeneration comprises the following steps:
1) the solar PV/T module is started, the solar PV/T module (1) converts solar radiation energy into electric energy and heat energy respectively, and the generated electric energy is stored in the storage battery (2) and used for driving the circulating solution pump (3) and the vacuum pump (14). Starting a circulating solution pump 3, and enabling the dilute solution to flow into the solar PV/T assembly 1; starting the vacuum pump 14, the second opening of the solution pressure reduction membrane distillation regeneration module, the higher dilute solution of temperature after the heating of the solar PV/T component 1 flows into the 4 tube passes of the pressure reduction membrane distillation regenerator, the vacuum pump 14 creates a negative pressure environment in the 4 shell passes of the pressure reduction membrane distillation regenerator, the partial pressure difference of water vapor on two sides of the membrane component is increased, the moisture in the dilute solution is vaporized on the inner side of the membrane, the generated water vapor diffuses to the vacuum side through the membrane holes, the concentration of the concentrated solution rises after the solution passes through the pressure reduction membrane distillation regenerator 4, and the high-concentration solution flows into the concentrated solution storage tank 6 for storage after being cooled by the heat exchanger 5.
2) The concentrated solution pump 7 is started, the solution dehumidification module III is started, concentrated solution flows into the multi-stage dew-point evaporative cooling dehumidifier 8 from the concentrated solution storage tank 6, heat and mass exchange is carried out on the concentrated solution and the processed air in the multi-stage dew-point evaporative cooling dehumidifier 8, the aim of air dehumidification is achieved, and the concentrated solution is changed into dilute solution after absorbing moisture and is sent into the dilute solution storage tank 10 to be stored by the dilute solution pump 9.
3) When the circulating solution pump 3 and the vacuum pump 14 are started, the latent heat recovery module IV is also started, dilute solution flows out from the dilute solution storage tank 10, the dilute solution is preheated by the heat exchanger 5, the preheated dilute solution flows into the tube side of the condenser 12, the vacuum pump 14 enables water vapor generated in the reduced pressure membrane distillation regenerator 4 to flow into the shell side of the condenser 11, the water vapor is condensed in the shell side of the condenser 11, condensed water and air flow into the gas-liquid separator 12 for separation at the same time, the air is discharged by the vacuum pump 14, the condensed water flows into the water storage tank 13 for collection, latent energy released by condensation heats the dilute solution, the dilute solution with the increased temperature flows into the solar PV/T component 1 for further heating and temperature rise, and a solution circulating process is formed.
The technical means disclosed in the invention scheme are not limited to the technical means disclosed in the above embodiments, but also include the technical scheme formed by any combination of the above technical features.

Claims (5)

1. Multistage dew point evaporative cooling dehumidification system based on vacuum membrane distillation regeneration, its characterized in that: the solar energy PV/T module (1) is used for introducing generated current into a storage battery (2) for storage, and the storage battery (2) is respectively connected with a circulating solution pump (3) and a vacuum pump (14); the solution outlet of the solar PV/T assembly (1) is connected with the inlet of the circulating solution pump (3), and the solution inlet of the solar PV/T assembly (1) is connected with the tube side outlet of the condenser (11); the outlet of the circulating solution pump (3) is connected with the tube-side inlet of the reduced pressure membrane distillation regenerator (4), the tube-side outlet of the reduced pressure membrane distillation regenerator (4) is connected with the shell-side inlet of the heat exchanger (5), and the shell-side outlet of the reduced pressure membrane distillation regenerator (4) is connected with the shell-side inlet of the condenser (11); the shell pass outlet of the heat exchanger (5) is connected with the inlet of the concentrated solution storage tank (6), and the outlet of the concentrated solution storage tank (6) is connected with a spraying device above the multi-stage dew-point evaporative cooling dehumidifier (8); an air inlet of the multi-stage dew-point evaporative cooling dehumidifier (8) is connected with a fan (16), and a water pump (15) is connected with a water spraying device in the multi-stage dew-point evaporative cooling dehumidifier (8); the outlet of the tray below the multistage dew point evaporative cooling dehumidifier (8) is connected with the inlet of a dilute solution pump (9), the outlet of the dilute solution pump (9) is connected with the inlet of a dilute liquid storage tank (10), the outlet of the dilute liquid storage tank (10) is connected with the tube pass inlet of a heat exchanger (5), the tube pass outlet of the heat exchanger (5) is connected with the tube pass inlet of a condenser (11), the shell pass outlet of the condenser (11) is connected with the inlet of a gas-liquid separator (12), and the outlet of the gas-liquid separator (12) is respectively connected with a vacuum pump (14) and a water receiver (13).
2. The multi-stage dew point evaporative cooling dehumidification system based on vacuum membrane distillation regeneration of claim 1, wherein: the multi-stage dew-point evaporative cooling dehumidifier (8) consists of three-stage dew-point evaporative cooling dehumidifiers, each stage of dew-point evaporative cooling dehumidifier consists of 2 heat recoverers (17), 2 dry channels (18), 2 wet channels (19), an air supply channel (20) and 2 air return channels (21), and the air supply channels (20) are axially and symmetrically distributed.
3. The multi-stage dew point evaporative cooling dehumidification system based on vacuum membrane distillation regeneration of claim 2, wherein: the working mode of the multi-stage dew point evaporative cooling dehumidifier (8) is as follows: fresh air respectively enters a heat recoverer (17) and an air supply channel (20), precooled primary air in the heat recoverer (17) is sent into a dry channel (18) and is cooled by a low-temperature wall surface, cooled air enters a wet channel (19) from a gap at the tail end of the dry channel (18), secondary air is evaporated and cooled in the wet channel (19) to take away heat on the surface of the channel, the cooled secondary air enters the heat recoverer (17) to precool the primary air, the secondary air is discharged into a return air channel (21) and takes away the temperature of the wall surface of the dry channel at the previous stage, solution flows into the air supply channel (20) from top to bottom along the wall surface in the air supply channel (20), the fresh air flows from bottom to top, the air and the wall surface solution carry out heat-mass exchange, and the air flows into the next stage of dew point for evaporative cooling and dehumidification after being dehumidified and.
4. The method for dehumidification by using the multi-stage dew point evaporative cooling dehumidification system based on vacuum membrane distillation regeneration as claimed in claim 1, is characterized in that:
1) starting a concentrated solution pump, starting a solution dehumidifying module, enabling the concentrated solution to flow into a spraying device above an air supply channel in the multi-stage dew-point evaporative cooling dehumidifier from a concentrated solution storage tank, starting a water pump, and sending tap water into the spraying device above a wet channel in the multi-stage dew-point evaporative cooling dehumidifier by the water pump;
2) starting a fan (16), sending outdoor fresh air into an inlet of a multi-stage dew point evaporative cooling dehumidifier (8) by the fan (16), respectively sending the outdoor fresh air into a heat recoverer (17) and an air supply channel (20), sending pre-cooled primary air in the heat recoverer (17) into a dry channel (18), cooling the primary air in the dry channel (18) by a low-temperature wall surface, sending the cooled air into a wet channel (19) from a gap at the tail end of the dry channel (18) to become secondary air, carrying out evaporative cooling on the secondary air in the wet channel (19) to take away heat on the surface of the channel, sending the evaporated and cooled secondary air into the heat recoverer (17) to pre-cool the primary air, sending the secondary air into a return air channel (21), and discharging the secondary air;
3) outdoor fresh air enters the air supply channel (20), and fresh air flows from bottom to top; in addition, concentrated solution is sent to spray set above dew point evaporative cooling dehumidifier (8) by concentrated solution pump (7), concentrated solution flows into air supply channel (20) from top to bottom along the wall, the air and solution carry out heat and mass exchange, the heat that the dehumidification process produced is taken away by wet passageway (19) wall, the air flows into next level dew point evaporative cooling dehumidification after being dehumidified and cooled down, concentrated solution absorbs becoming dilute solution after moisture and is sent into dilute solution liquid storage pot (10) by dilute solution pump (9) and stores.
5. The method for regenerating by using the multistage dew point evaporative cooling dehumidification system based on vacuum membrane distillation regeneration as claimed in claim 1, wherein: the method comprises the following steps:
1) the solar PV/T module is started, the solar PV/T module (1) converts solar radiation energy into electric energy and heat energy respectively, the generated electric energy is stored in the storage battery (2) and used for driving the circulating solution pump (3) and the vacuum pump (14), the circulating solution pump (3) is started, the solution channel of the solar PV/T module (1) is started, and dilute solution flows into the solar PV/T module (1); starting a vacuum pump (14), starting a solution pressure reduction membrane distillation regeneration module, enabling a dilute solution heated by a solar PV/T component (1) to flow into a tube pass of a pressure reduction membrane distillation regenerator (4), building a negative pressure environment in a shell pass of the pressure reduction membrane distillation regenerator (4) by the vacuum pump (14), increasing the partial pressure difference of water vapor at two sides of the membrane component, vaporizing the moisture in the dilute solution at the inner side of the membrane, diffusing the generated water vapor to the vacuum side through a membrane hole, increasing the concentration of a concentrated solution after the solution passes through the pressure reduction membrane distillation regenerator (4), and enabling a high-concentration solution to flow into a concentrated solution storage tank (6) for storage after being cooled by a heat exchanger (5);
2) starting a concentrated solution pump (7), starting an evaporative cooling dehumidification module, enabling a concentrated solution to flow into a multi-stage dew point evaporative cooling dehumidifier (8) from a concentrated solution storage tank (6), carrying out heat and mass exchange on the concentrated solution and the processed air in the multi-stage dew point evaporative cooling dehumidifier (8) to achieve the purpose of air dehumidification and cooling, and enabling the concentrated solution to be changed into a dilute solution after absorbing moisture and to be sent into a dilute solution storage tank (10) by a dilute solution pump (9) for storage;
3) when a circulating solution pump (3) and a vacuum pump (14) are started, a latent heat recovery module is also started, dilute solution flows out from a dilute solution storage tank (10), is preheated through a heat exchanger (5), the preheated dilute solution flows into a tube pass of a condenser (12), the vacuum pump (14) enables water vapor generated in a reduced pressure membrane distillation regenerator (4) to flow into a shell pass of the condenser (11), the water vapor is condensed in the shell pass of the condenser (11), both condensed water and air flow into a gas-liquid separator (12) for separation, the air is discharged by the vacuum pump (14), the condensed water flows into a water storage tank (13) for collection, latent energy released by condensation heats the dilute solution, and the dilute solution with increased temperature flows into a solar PV/T component (1) for further heating and heating to form a solution circulation process.
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