CN108626816B - Humidity step processing device in low-humidity environment - Google Patents

Humidity step processing device in low-humidity environment Download PDF

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CN108626816B
CN108626816B CN201810294378.5A CN201810294378A CN108626816B CN 108626816 B CN108626816 B CN 108626816B CN 201810294378 A CN201810294378 A CN 201810294378A CN 108626816 B CN108626816 B CN 108626816B
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air
cooler
branch
outlet
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CN108626816A (en
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张伦
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
    • F24F13/00Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
    • F24F13/30Arrangement or mounting of heat-exchangers

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  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Central Air Conditioning (AREA)
  • Drying Of Gases (AREA)

Abstract

The invention discloses a humidity gradient processing device in a low-humidity environment, which comprises a first fan, a primary filter, a medium-efficiency filter, a first surface cooler, a solution dehumidifying system, a first fresh air branch, a second fresh air branch, a first return air branch, a second return air branch and a vapor compression heat pump system, wherein the first fan, the primary filter and the medium-efficiency filter are sequentially arranged along the direction of outdoor fresh air, the first surface cooler is arranged behind the first surface cooler, and the vapor compression heat pump system is connected with the solution dehumidifying system, the first fresh air branch and the second return air branch. The humidity processing flow of air in the device includes condensation dehumidification process, solution dehumidification process and runner dehumidification process in proper order, can cool down and the degree of depth dehumidification to damp and hot air to satisfy the demand of industry low humidity environment commonly used.

Description

Humidity step processing device in low-humidity environment
Technical Field
The invention belongs to the technical field of design and manufacture of air conditioning systems, and relates to an air treatment device capable of providing a low-humidity environment for a building room.
Background
In the field of design and manufacture of current air conditioning equipment, the main focus is on the construction of indoor hot and humid environments of civil buildings such as public buildings and family houses, and related air conditioning products for industrial buildings are not abundant. However, the control requirements of industrial buildings for humid and hot environments are often more severe than those of civil buildings, so that the current common air treatment equipment is difficult to meet the special requirements.
In industrial buildings, many technological production and processing occasions have strict requirements on indoor temperature and humidity, cleanliness and the like, and indoor hot and humid environment regulation and control are important links for guaranteeing industrial technological production requirements. Due to the wide variety of industrial products, the required indoor production environments vary widely. For example, the indoor temperature and humidity of a wire and cable manufacturing plant are required to be 27 ℃, and the relative humidity and the moisture content are as low as 5-20% and 1.1-4.4 gkg; the environmental requirements of capsule storage in the pharmaceutical field are that the temperature is 24 ℃, the relative humidity and the moisture content are 35-40% and 6.5-7.4 gkg; the temperature requirement for storage and drying of cereals in food production is as low as 16 ℃, the relative humidity and moisture requirements are 40% and 4.5 g/kg; the temperature of the printing and binding process in the light industrial production can reach 32 ℃, but the relative humidity of air is controlled to be about 30% (moisture content is 8.9 g/kg). Therefore, generally speaking, the environment with low humidity is required by most industrial production occasions, the indoor moisture content is controlled to be below 1Og/kg, and the low-humidity environment with the moisture content below 5g/kg is also very common.
The demands of industrial low humidity environments and the control of indoor temperatures place stringent demands on air conditioning process equipment. At present, three common methods of humidity control in industrial buildings are condensation dehumidification, solution dehumidification and rotary dehumidification. When the air conditioning equipment using the condensation dehumidification mode provides a low-humidity environment for an industrial building, the temperature of a cold source used in the air conditioning equipment must be very low so as to reach the temperature below the dew point temperature of air in the low-moisture-content environment, and the aim of dehumidifying the air is fulfilled. Therefore, the energy consumption of the related equipment such as the water chilling unit and the like is very large, and high operation cost is brought. In addition, the temperature of the air after condensation and dehumidification is also very low, so an additional reheating unit is needed to increase the air supply temperature so as to meet the requirement of industrial production, and the energy consumption of the air conditioning system is further increased.
In view of the problem of excessive energy consumption of the condensation dehumidification mode, the solution dehumidification technology adopting the non-mechanical dehumidification mode is widely applied in recent years. In the solution dehumidification air conditioning unit, air is in direct contact with a dehumidification solution, moisture in the air is directly absorbed by the dehumidification solution, and the diluted dehumidification solution can be regenerated by utilizing low-level heat sources such as industrial waste heat and solar energy. The air conditioning system has the greatest advantages that the energy-saving effect is remarkable, the refrigeration temperature is not required to be very low, only the processing requirement of sensible heat load needs to be met, and in addition, the solution dehumidification process is accompanied with the release of heat, so that the temperature of the air after being dehumidified and cooled is not particularly low. Although solution desiccant air conditioning units offer advantages in energy conservation, problems are encountered when they are applied to the control of industrial low humidity environments. For example, when the air humidity load is too large and the requirement for the moisture content of the supplied air is too low, a single-stage solution dehumidification air-conditioning system is difficult to meet the requirement, and a multi-stage form is necessary, which results in the problems of too large occupied space of equipment and too high cost. A single solution dehumidification system is not well suited for deep dehumidification applications.
The rotary dehumidification is a common technology suitable for a deep dehumidification process, and the use of rotary dehumidification equipment for providing a low-humidity environment for industrial production is a feasible technical means. However, the dehumidification of the rotating wheel is usually accompanied by the release of heat, the air is dehumidified and simultaneously brings about a large temperature rise, and the requirement of the environmental temperature in the building cannot be met due to the excessively high air supply temperature. The defect of inflexible air parameter adjustment is the most important factor limiting the independent operation of the rotary wheel dehumidification device.
In order to solve the problems, how to construct an air conditioning system suitable for the low-humidity environment and temperature requirements of most industrial buildings on the basis of the existing technical means and meet the requirements of environmental protection and energy conservation are a problem to be solved in the field of design and manufacture of air conditioning equipment at present.
Disclosure of Invention
The purpose of the invention is as follows: the invention aims to provide a humidity gradient processing device in a low-humidity environment, which provides conditions for controlling the indoor hot and wet environment of an industrial building. The device effectively combines three air humidity processing modes of condensation dehumidification, solution dehumidification and rotary wheel dehumidification through system optimization design, and is assisted with other air state adjusting equipment simultaneously to realize the control of air supply temperature and moisture content and reach the effect of system energy conservation and environmental protection.
The technical scheme is as follows: the invention relates to a humidity gradient processing device in a low-humidity environment, which comprises a first fan, a primary filter, a medium-efficiency filter, a first surface air cooler, a solution dehumidifying system, a first fresh air branch, a second fresh air branch, a first return air branch and a second return air branch, and a vapor compression heat pump system, wherein the first fan, the primary filter and the medium-efficiency filter are sequentially arranged along an outdoor fresh air direction, the solution dehumidifying system is arranged behind the first surface air cooler, and the vapor compression heat pump system is connected with the solution dehumidifying system, the first fresh air branch and the second return air branch. The solution dehumidifying system comprises a solution dehumidifier arranged at the rear of the first surface cooler, a dehumidifying solution pump with an inlet connected with a first solution outlet at the bottom of the solution dehumidifier, a solution cooler connected with an outlet of the dehumidifying solution pump, a solution regenerator connected with the solution dehumidifier, and a solution heater connected with the solution regenerator, wherein a solution outlet of the solution cooler is connected to a solution distributor at the top of the solution dehumidifier. First new trend branch road and second new trend branch road set up in solution dehumidifier fresh air treatment export rear: the second surface cooler, the rotary dehumidifier, the air cooler, the third surface cooler and the high-efficiency filter are sequentially arranged in the first fresh air branch along the fresh air direction, the air outlet of the high-efficiency filter is communicated with the interior of the building, and the first fresh air branch is connected with the first fresh air branch in parallel.
The second fresh air branch is internally provided with a heat regenerator, the starting end of the second return air branch is communicated with the interior of the building, the tail end of the second return air branch is connected with the regeneration zone of the rotary dehumidifier, the heat regenerator is connected with the mixed regeneration air outlet of the regeneration zone of the rotary dehumidifier, and the fresh air outlet of the heat regenerator is connected to a pipeline between the regeneration zones of the second return air branch and the rotary dehumidifier. The vapor compression type heat pump system comprises a compressor, a first condenser, a second condenser, an expansion valve, a first evaporator and a second evaporator which are sequentially connected along a refrigerant pipeline, wherein a refrigerant pipeline outlet of the second evaporator is connected with a refrigerant inlet of the compressor, the first condenser is connected with a solution heater, the second condenser is connected with a second return air branch, the first evaporator is connected with an air cooler, and the second evaporator is connected with the solution cooler.
Furthermore, in the device of the present invention, in the solution dehumidification system, the solution dehumidification system further includes a regenerated solution pump disposed between the solution regenerator and the solution heater, a second solution outlet at the bottom of the solution dehumidifier is connected to a solution inlet at the bottom of the solution regenerator through a first solution balance pipeline, a bottom solution outlet of the solution regenerator is connected to an inlet of the regenerated solution pump through a solution pipeline, an outlet of the regenerated solution pump is connected to a solution inlet of the solution heater, and a solution outlet of the solution heater is connected to a solution distributor at the top of the solution regenerator.
Furthermore, in the device, a solution outlet of the solution heater is divided into one path, and the other path is connected to a pipeline between the solution outlet of the solution cooler and a liquid distributor at the top of the solution dehumidifier through a second solution balance pipeline and is used for supplying the dehumidifying solution.
Furthermore, in the device, the starting end of the first air return branch is communicated with the interior of the building, the tail end of the first air return branch is connected with a first fresh air branch pipeline in front of the second surface air cooler, and a third fan for extracting return air from the interior of the building is arranged on the first air return branch. A fourth fan, an air heater and an electric heater are sequentially arranged in the second return air branch along the return air direction, a fresh air outlet of the heat regenerator is connected to a pipeline between the fourth fan and the air heater, and an air outlet of the heat regenerator is connected to the outside; the hot water outlet of the second condenser is connected with the hot water inlet of the air heater, and the hot water inlet of the second condenser is connected with the hot water outlet of the air heater.
Furthermore, in the device, a hot water outlet of the first condenser is connected with a hot water inlet of the solution heater, and a hot water inlet of the first condenser is connected with a hot water outlet of the solution heater; a cold water outlet of the first evaporator is connected with a cold water inlet of the air cooler, and the cold water inlet of the first evaporator is connected with a cold water outlet of the air cooler; the cold water outlet of the second evaporator is connected with the cold water inlet of the solution cooler, and the cold water inlet of the second evaporator is connected with the cold water outlet of the solution cooler.
Furthermore, in the device, a second fan used for providing regeneration air required by solution regeneration is arranged in front of the air inlet of the solution regenerator.
Furthermore, in the device, the cold quantity required by the solution cooler is supplied by the second evaporator, the cold quantity required by the air cooler is supplied by the first evaporator, the heat quantity required by the solution heater is supplied by the first condenser, and the heat quantity required by the air heater is supplied by the second condenser.
Furthermore, in the device, the cold source used in the first surface cooler is chilled water with the inlet temperature of 7 ℃.
Furthermore, in the device, the cold source used in the second surface air cooler is chilled water with the inlet temperature of 7 ℃.
Furthermore, in the device, the cold source used in the third surface cooler is chilled water with the inlet temperature of 7 ℃.
Specifically, in the humidity gradient processing device in the low-humidity environment, outdoor high-temperature and high-humidity processed air (fresh air) is firstly sent into a unit by a first fan, and then is purified and filtered by a primary filter and a middle-efficiency filter in sequence. The primarily purified air is then sent to a first surface cooler for a first stage of cooling and dehumidification. The cold source used in the first surface air cooler is chilled water with the inlet temperature of 7 ℃, and after the chilled water is treated by the first surface air cooler, the temperature and the moisture content of the treated fresh air are both greatly reduced. But because the cold source temperature that uses is limited, the humidity of the air after the condensation dehumidification still can't reach the air supply parameter requirement of low humidity environment, and the humidity of new trend still needs further reduction this moment, consequently sets up the solution dehumidifier behind first surface cooler for accomplish by the second grade dehumidification process of handling the air.
In the humidity gradient processing device in the low-humidity environment, the solution dehumidifying system mainly comprises a solution dehumidifier, a solution regenerator, a solution dehumidifying and regenerating pump and a solution cooling and heating device. The treated air enters the solution dehumidifier after being treated by the first surface air cooler, the air in the solution dehumidifier is in direct contact with the dehumidifying solution, and the moisture in the air enters the dehumidifying solution. Therefore, after passing through the solution dehumidifier, the humidity of the processed air is further reduced to be basically close to the requirement of the air supply humidity of the low-humidity environment, but the air temperature is higher than the air supply requirement, and the processed air needs to be further processed;
in the solution dehumidifying system, two outlets are arranged in a solution tank at the bottom of the solution dehumidifier, and one outlet is connected to a dehumidifying solution pump and used for circulating a dehumidifying solution; the other outlet is connected to the bottom inlet of the solution regenerator through a first solution balance pipeline and is used for conveying the diluted solution which absorbs the air moisture after dehumidification to the regenerator to complete the solution regeneration process. The circulating dehumidifying solution in the solution dehumidifier is cooled by a solution cooler to maintain the temperature requirement in the air treatment process, and a cold source used in the solution cooling is cold energy provided by an evaporator of a vapor compression heat pump system. In the solution regenerator, the second fan sends outdoor fresh air into the solution regenerator to be used as regeneration air, the dehumidifying solution transfers moisture to the regeneration air in the solution regenerator, and then the regeneration air is discharged outdoors. The solution in the solution regenerator is driven by a regenerated solution pump, the regenerated solution reaches the regeneration temperature requirement through a solution heater, and a heat source used in the solution heater is condensation heat provided by a condenser of a vapor compression heat pump system. And a solution supply pipeline is arranged between the solution regenerator and the circulating pipeline of the solution dehumidifier and is used for supplying the regenerated concentrated solution to the dehumidifier so as to maintain the concentration of the dehumidifying solution in the dehumidifier during air treatment.
Furthermore, in the humidity gradient processing device in the low humidity environment, the processed air (fresh air) is divided into two parts after being processed by the solution dehumidifier, and the two parts respectively enter the first fresh air branch and the second fresh air branch. The processed air entering the first fresh air branch is mixed with the return air in the first return air branch to be used as supplied air; the processed air entering the second fresh air branch is mixed with the return air in the second return air branch and used as the regenerated air of the rotary dehumidifier. The return air of the first return air branch and the return air of the second return air branch are respectively extracted from the interior of the building by the third fan and the fourth fan, and the total amount of the extracted return air is slightly smaller than the total amount of the air supply of the whole device to the interior of the building.
Further, in the humidity step processing device in the low humidity environment, after the processed air in the first fresh air branch is mixed with the return air in the first return air branch, the moisture content of the mixed air is basically unchanged, but the temperature is slightly reduced, and the mixed air is finally used as the supply air to be further processed: the mixed air firstly enters a second surface air cooler for pre-cooling before rotary wheel dehumidification, and a cold source used in the second surface air cooler is 7 ℃ chilled water; and the pre-cooled mixed air is then sent into a dehumidification section of a rotary dehumidifier for deep dehumidification. The rotary wheel dehumidification process is accompanied with large heat release, so the mixed air has large temperature rise after being treated by the rotary wheel, and the temperature is required to be reduced when the temperature of the air supply state is reached. In this device, the mixed air carries out the two-stage cooling once more from the dehumidification interval of runner dehumidifier back by air cooler and third surface cooler, and the cold source that uses in the air cooler is the cold volume that vapor compression heat pump system evaporimeter provided, and the cold source that the third surface cooler used is 7 ℃ chilled water. After the humidity and the temperature of the mixed air are processed, the mixed air is finally purified by a high-efficiency filter, and then the mixed air meeting the temperature and humidity conditions is used as air supply to be sent into a building room to process the heat and humidity load in the building.
The specific regeneration method of the regeneration half-zone of the rotary dehumidifier in the humidity gradient treatment device in the low-humidity environment comprises the following steps: the mixed air of the fresh air in the second fresh air branch and the return air in the second return air branch is used as the regenerated air; the fresh air in the second fresh air branch exchanges heat with the exhaust air in the regeneration section of the rotary dehumidifier before the return air is mixed, so that the heat recovery of the exhaust air of the rotary dehumidifier is realized. The fresh air heated in the heat regenerator is mixed with the return air in the second return air branch, and the mixed regeneration air is heated twice by the air heater and the electric heater and then is sent to the regeneration section of the rotary dehumidifier. The heat source in the air heater is the condensation heat provided by the condenser of the vapor compression heat pump. The mixed regeneration air absorbing the moisture in the regeneration zone is discharged out of the room after heat recovery by the heat regenerator.
Furthermore, the vapor compression heat pump system of the humidity step processing device in the low humidity environment is composed of a compressor, two condensers connected in series, an expansion valve and two evaporators connected in series. The cold energy of the first evaporator is used for supplying to an air cooler, and the cold energy of the second evaporator is used for supplying to a solution cooler; the condensation heat of the first condenser is used for heating the solution of the solution heater, and the condensation heat of the second condenser is used for heating the air in the air heater.
Further, the dehumidifying solution used in the solution dehumidifying system of the humidity step processing device in the low humidity environment is one of a calcium chloride solution, a lithium bromide solution and a lithium chloride solution, or a mixed solution of the calcium chloride solution and the lithium bromide solution and the calcium chloride and the lithium chloride solution; the rotary dehumidifier is in the form of an adsorption rotary, and the rotary is synthesized by taking glass fiber and heat-resistant ceramic material as internal supporting carriers and adding high-efficiency moisture-absorbing medium materials.
The invention applies the technologies of condensation dehumidification, solution dehumidification, rotary dehumidification and the like, can cool the damp and hot air and deeply dehumidify the damp and hot air so as to meet the requirements of the common industrial low-humidity environment. The humidity processing flow of air in the device sequentially comprises a condensation dehumidification process, a solution dehumidification process and a rotating wheel dehumidification process, and the device is mainly provided with a surface cooler, a solution dehumidification system, a rotating wheel dehumidification device and a vapor compression heat pump system. Wherein, the condensation dehumidification process of the air is completed by a surface cooler, which is a first-stage dehumidification process, and a cold source used by the surface cooler is chilled water with the temperature of 7 ℃; the solution dehumidification process is completed by a solution dehumidification system, and in the second-stage dehumidification process, the cold and heat required by the solution dehumidification system is provided by a vapor compression heat pump system; the rotary wheel dehumidification device completes the third-stage deep dehumidification process of air, the heat of the rotary wheel dehumidification device is provided by the vapor compression heat pump and the electric heater together, and fresh air used by regenerated air and mixed air of indoor return air are provided.
Has the advantages that: compared with the prior art, the invention has the following advantages:
(1) the system can realize the accurate control of the hot and humid environment of the industrial building, can realize deep dehumidification, particularly can meet the requirement of the industrial low-humidity environment, adopts a mode of humidity gradient treatment, realizes the reasonable matching of cold and heat sources applied to unit operation parameters, and has obvious energy-saving effect of the whole system;
(2) compared with the air conditioning equipment adopting a single condensation dehumidification mode, when the deep dehumidification treatment of the air is realized, the temperature of a cold source used by the unit is greatly improved, an additional air supply reheating device is not needed, and the energy consumption and the cost of the whole system are effectively reduced;
(3) compared with air conditioning equipment adopting a solution dehumidification mode, when deep dehumidification of air is realized, the occupied space and cost of the equipment are greatly reduced, the concentration of the dehumidification solution used in the system is effectively limited, the problems of unit corrosion and regeneration energy consumption increase caused by overhigh concentration of the dehumidification solution are solved, and the stability of the whole system is better;
(4) compared with other air conditioning equipment adopting rotary wheel dehumidification, the air supply parameter adjusting mode of the invention is more flexible, the effective utilization of the heat regenerator and the heat pump condensation heat greatly reduces the heat demand when the dehumidification rotary wheel is regenerated, and compared with a single-stage dehumidification processing mode of the rotary wheel dehumidifier, the mode adopting humidity step processing has better matching degree of the load of each section with a cold source or other control parameters and higher energy utilization efficiency.
Drawings
FIG. 1 is a schematic diagram of the overall structure and flow of the apparatus of the present invention;
the figure shows that: the system comprises a first fan 1, a primary filter 2, a medium-efficiency filter 3, a first surface cooler 4, a solution dehumidifier 5, a dehumidifying solution pump 6, a solution cooler 7, a solution regenerator 8, a regenerating solution pump 9, a solution heater 10, a second fan 11, a second surface cooler 12, a rotary dehumidifier 13, an air cooler 14, a third surface cooler 15, a high-efficiency filter 16, a third fan 17, a fourth fan 18, an air heater 19, an electric heater 20, a heat regenerator 21, a compressor 22, a first condenser 23, a second condenser 24, an expansion valve 25, a first evaporator 26, a second evaporator 27, a first fresh air branch 28, a second fresh air branch 29, a first return air branch 30, a second return air branch 31, a first solution balance pipeline 32, a second solution balance pipeline 33, a first liquid distributor 34 and a second liquid distributor 35.
Detailed Description
With reference to FIG. 1, the air conditioner is operated at 35 deg.C for treating outdoor air, 56% for relative humidity, 20g/kg for moisture content, and 3000m for air supply3The typical summer working condition of/h is taken as an example to further illustrate the specific implementation mode of the invention.
When the humidity gradient processing device in the low-humidity environment operates, the first fan 1 is started to convey outdoor fresh air into the unit, and the fresh air input by the first fan 1 is 1200m3H is used as the reference value. The rear of the first fan 1 is sequentially provided with a primary filter 2 and a middle filter 3 for purifying outdoor fresh air. The purified fresh air is then sent into the first surface air cooler 4 for primary cooling and dehumidification, and a cold source used in the first surface air cooler 4 is chilled water with the inlet temperature of 7 DEG CThe state of the fresh air treated by the first surface air cooler 4 is changed to 21 ℃ and 8 g/kg. The air humidity processing flow sequentially comprises a condensation dehumidification process, a solution dehumidification process and a rotary wheel dehumidification process, wherein the primary dehumidification process is completed by the first surface air cooler 4 in a condensation dehumidification mode; the secondary dehumidification process is completed by a solution dehumidifier 5 in a solution dehumidification mode; the deep dehumidification process is completed by the rotary dehumidifier 13, and a rotary dehumidification mode is adopted.
In the humidity gradient processing device in the low-humidity environment, the second-stage dehumidification process of fresh air is completed by the solution dehumidification system. Wherein the solution dehumidifier 5 is arranged right behind the first surface cooler 4, the operating temperature of the dehumidifying solution in the dehumidifier 5 is about 20 ℃, and the state of the fresh air processed by the dehumidifier 5 is changed into 23 ℃ and 4 g/kg. Furthermore, two outlets are arranged in the solution tank at the bottom of the solution dehumidifier 5, a first solution outlet is connected to an inlet of the dehumidifying solution pump 6 through a solution pipeline, an outlet of the solution dehumidifying solution pump 6 is connected to a solution inlet of the solution cooler 7, and a solution outlet of the solution cooler 7 is connected to a solution distributor at the top of the solution dehumidifier 5; the second solution outlet of the solution tank at the bottom of the solution dehumidifier 5 is connected with the solution inlet at the bottom of the solution regenerator 8 through a first solution balance pipeline 32, and is used for conveying the diluted solution which absorbs the moisture in the air after dehumidification to the regenerator to complete the solution regeneration process. Further, a solution outlet at the bottom of the solution regenerator 8 is connected to an inlet of a regenerated solution pump 9 through a solution pipeline, an outlet of the regenerated solution pump 9 is connected to a solution inlet of a solution heater 10, a solution outlet pipeline of the solution heater 10 is divided into two paths, one path is connected to a liquid distributor at the top of the solution regenerator 8, and the other path is connected to a pipeline between the solution cooler 7 and the liquid distributor at the top of the solution dehumidifier 5 and used for supplying concentrated solution to the solution dehumidifier 5. The regenerated air in the solution regenerator 8 uses outdoor fresh air which is sent by the second fan 11, the dehumidifying solution transfers moisture to the regenerated air in the regenerator, and then the regenerated air is discharged outdoors. In addition, the cold source used in the solution cooler 7 is cold energy provided by the second evaporator 27 in the vapor compression heat pump system; the heat source used in the solution heater 10 is the heat of condensation provided by the first condenser 23 in a vapour compression heat pump system.
In the humidity gradient processing device in the low-humidity environment, fresh air is processed by the solution dehumidifier 5 and then divided into a first fresh air branch and a second fresh air branch. Wherein the fresh air quantity distributed in the first fresh air branch is 500m3The fresh air is mixed with the return air in the first return air branch and finally used as supplied air; the fresh air quantity distributed in the second fresh air branch is 700m3And h, after the heat in the exhaust air of the rotary dehumidifier 13 is recovered, the fresh air is mixed with the return air in the second return air branch and is used as the regeneration air of the rotary dehumidifier 13.
In the preferred embodiment of the invention, the return air of the first return air branch is extracted from the building room by the third fan 17, the state parameter of the return air is 26 ℃, 4g/kg, and the return air quantity is 2500m3H is used as the reference value. After the fresh air in the first fresh air branch and the return air in the first return air branch are mixed, the state of the mixed air is 25.5 ℃, 4g/kg, and the air volume is 3000m3H is used as the reference value. The mixed air (supply air) is then sent into a second surface air cooler 12 for pre-cooling before rotary dehumidification, a cold source used in the second surface air cooler 12 is chilled water with the inlet temperature of 7 ℃, and the temperature of the mixed air after pre-cooling is changed to 16 ℃. And the pre-cooled mixed air is then sent into a dehumidification section of a rotary dehumidifier for deep dehumidification. The rotary dehumidifier 13 is installed at the rear of the second surface cooler 12, and since a large amount of heat is released during rotary dehumidification, the state of the treated mixed air is at 28 ℃ and 2 g/kg.
In the preferred embodiment of the invention, the fresh air in the second fresh air branch enters the heat regenerator 21 to exchange heat with the exhaust air in the regeneration zone of the rotary dehumidifier 13, and the state parameters of the fresh air after heat recovery are 33 ℃ and 4 g/kg. The return air in the second return air branch is extracted from the building inner chamber by a fourth fan 18, and the return air quantity is 300m3And h, the return air parameters are consistent with those in the first return air branch. After the second fresh air branch and the second return air branch are mixed, the mixed air is used as the regenerated air of the rotary dehumidifier 13, and the total quantity of the regenerated air is 1000m3The parameters are 31 ℃ and 4 g/kg. Mixing ofThe combined regenerated air is then sent into an air heater 19 for heating, the heat source in the air heater 19 is the condensation heat provided by a second condenser 24 of the vapor compression heat pump, and the temperature of the heated air is raised to about 38 ℃. The electric heater 20 is arranged behind the air heater 19 and used for secondarily heating the mixed regeneration air so as to meet the requirement of regeneration temperature, and the temperature of the electrically heated mixed air is increased to about 90 ℃. The regeneration air finally enters the regeneration zone of the rotary dehumidifier 13, and the mixed regeneration air absorbing the moisture in the regeneration zone is discharged to the outside after heat recovery by the heat regenerator 21.
In the humidity gradient processing device in the low-humidity environment, after the mixed air (air supply) is subjected to deep dehumidification by the rotary dehumidifier 13, the moisture content of the air supply reaches the requirement, but the air supply temperature still needs to be reduced continuously. Therefore, the mixed air (blast air) is sequentially cooled by the air cooler 14 and the third surface cooler 15 which are arranged behind the rotary dehumidifier 13 until the blast air temperature meets the requirement of 18 ℃. The cold source used in the air cooler 14 is cold energy provided by the first evaporator 26 of the vapor compression heat pump, and the cold source used in the third surface cooler 15 is chilled water with an inlet temperature of 7 ℃. After the air supply state reaches 18 ℃ and 2g/kg, the air supply is finally sent into the building room after being deeply purified by the high-efficiency filter 16 so as to maintain the environment state in the industrial building.
The vapor compression heat pump system can simultaneously provide cooling of the solution and air in the device and the cold and heat required by heating of the solution and air, wherein the cold required by the solution cooler 7 is supplied by the second evaporator 27, and the cold required by the air cooler 14 is supplied by the first evaporator 26; the heat required by the solution heater 10 is supplied by a first condenser 23 and the heat required by the air heater 19 is supplied by a second condenser 24.
In the humidity gradient processing device in the low-humidity environment, the required part of cold and heat is provided by a vapor compression heat pump system. The vapor compression heat pump system is composed of a compressor 22, a first condenser 23, a second condenser 24, an expansion valve 25, a first evaporator 26 and a second evaporator 27 which are connected in sequence through refrigerant pipelines. Wherein, the first condenser 23 is connected with the second condenser 24 in series, the hot water outlet of the first condenser 23 is connected with the hot water inlet of the solution heater 10, and the hot water outlet of the solution heater 10 is connected with the hot water inlet of the first condenser 23; the hot water outlet of the second condenser 24 is connected to the hot water inlet of the air heater 19, and the hot water inlet of the second condenser 24 is connected to the hot water outlet of the air heater 19. The first evaporator 26 is connected in series with the second evaporator 27, the cold water outlet of the first evaporator 26 is connected with the cold water inlet of the air cooler 14, and the cold water inlet of the first evaporator 26 is connected with the cold water outlet of the air cooler 14; the cold water outlet of the second evaporator 27 is connected to the cold water inlet of the solution cooler 7, and the cold water inlet of the second evaporator 27 is connected to the cold water outlet of the solution cooler 7.
It should be noted that, in the above embodiment, the air state parameters given by each operating point under typical conditions are estimated values under ideal conditions, and the unit parameters may fluctuate and have a certain deviation during actual operation, so that the air supply parameters can always meet the requirements of a specific industrial building in a low-humidity environment.

Claims (10)

1. The humidity gradient processing device in the low-humidity environment is characterized by comprising a first fan (1), a primary filter (2), a medium-efficiency filter (3), a first surface cooler (4), a solution dehumidifying system, a first fresh air branch, a second fresh air branch, a first return air branch, a second return air branch and a vapor compression heat pump system, wherein the first fan (1), the primary filter (2), the medium-efficiency filter (3) and the first surface cooler (4) are sequentially arranged along the direction of outdoor fresh air;
the solution dehumidifying system comprises a solution dehumidifier (5) arranged behind a first surface cooler (4), a dehumidifying solution pump (6) with an inlet connected with a first solution outlet at the bottom of the solution dehumidifier (5), a solution cooler (7) connected with an outlet of the dehumidifying solution pump (6), a solution regenerator (8) connected with the solution dehumidifier (5), and a solution heater (10) connected with the solution regenerator (8), wherein a solution outlet of the solution cooler (7) is connected to a solution distributor at the top of the solution dehumidifier (5);
first new trend branch road and second new trend branch road set up in solution dehumidifier (5) new trend processing export rear: a second surface air cooler (12), a rotary dehumidifier (13), an air cooler (14), a third surface air cooler (15) and a high-efficiency filter (16) are sequentially arranged in the first fresh air branch along the fresh air direction, an air outlet of the high-efficiency filter (16) is communicated with the interior of a building, and the first fresh air branch is connected with the first fresh air branch in parallel;
a heat regenerator (21) is arranged in the second fresh air branch, the starting end of the second return air branch is communicated with the interior of the building, the tail end of the second return air branch is connected with the regeneration zone of the rotary dehumidifier (13), the heat regenerator (21) is connected with a mixed regeneration air outlet in the regeneration zone of the rotary dehumidifier (13), and a fresh air outlet of the heat regenerator (21) is connected to a pipeline between the second return air branch and the regeneration zone of the rotary dehumidifier (13);
the vapor compression heat pump system comprises a compressor (22), a first condenser (23), a second condenser (24), an expansion valve (25), a first evaporator (26) and a second evaporator (27) which are sequentially connected along a refrigerant pipeline, wherein a refrigerant pipeline outlet of the second evaporator (27) is connected with a refrigerant inlet of the compressor (22), the first condenser (23) is connected with a solution heater (10), the second condenser (24) is connected with a second return air branch, and the first evaporator (26) is connected with an air cooler (14); the second evaporator (27) is connected to the solution cooler.
2. The humidity cascade treatment device in a low humidity environment as claimed in claim 1, further comprising a regeneration solution pump (9) disposed between the solution regenerator (8) and the solution heater (10), wherein the second solution outlet at the bottom of the solution dehumidifier (5) is connected to the solution inlet at the bottom of the solution regenerator (8) by a first solution balance pipe (32), the solution outlet at the bottom of the solution regenerator (8) is connected to the inlet of the regeneration solution pump (9) by a solution pipe, the outlet of the regeneration solution pump (9) is connected to the solution inlet of the solution heater (10), and the solution outlet of the solution heater (10) is connected to the solution distributor at the top of the solution regenerator (8).
3. The humidity step processing device in low humidity environment as claimed in claim 2, wherein the solution outlet of the solution heater (10) is branched off and connected to the pipeline between the solution outlet of the solution cooler (7) and the liquid distributor on the top of the solution dehumidifier (5) through a second solution balance pipeline (33) for supplying the dehumidifying solution.
4. The humidity step processing device for the low humidity environment as claimed in claim 1, 2 or 3, wherein the starting end of the first air return branch is communicated with the interior of the building, the tail end of the first air return branch is connected with the first air return branch in front of the second surface air cooler (12) through a pipeline, and the first air return branch is provided with a third fan (17) for drawing return air from the interior of the building;
a fourth fan (18), an air heater (19) and an electric heater (20) are sequentially arranged in the second air return branch along the air return direction, a fresh air outlet of a heat regenerator (21) is connected to a pipeline between the fourth fan (18) and the air heater (19), and an air outlet of the heat regenerator (21) is connected to the outside; the hot water outlet of the second condenser (24) is connected with the hot water inlet of the air heater (19), and the hot water inlet of the second condenser (24) is connected with the hot water outlet of the air heater (19).
5. A humidity step treatment device in a low humidity environment as claimed in claim 1, 2 or 3, wherein the hot water outlet of the first condenser (23) is connected to the hot water inlet of the solution heater (10), and the hot water inlet of the first condenser (23) is connected to the hot water outlet of the solution heater (10); the cold water outlet of the first evaporator (26) is connected with the cold water inlet of the air cooler (14), and the cold water inlet of the first evaporator (26) is connected with the cold water outlet of the air cooler (14); the cold water outlet of the second evaporator (27) is connected with the cold water inlet of the solution cooler (7), and the cold water inlet of the second evaporator (27) is connected with the cold water outlet of the solution cooler (7).
6. A humidity step treatment device in low humidity environment as claimed in claim 1, 2 or 3, characterized in that the air inlet of the solution regenerator (8) is preceded by a second fan (11) for providing the regeneration air required for solution regeneration.
7. A humidity step treatment device in a low humidity environment according to claim 1, 2 or 3, characterized in that the cooling capacity required by the solution cooler (7) is supplied by the second evaporator (27), the cooling capacity required by the air cooler (14) is supplied by the first evaporator (26), the heat capacity required by the solution heater (10) is supplied by the first condenser (23), and the heat capacity required by the air heater (19) is supplied by the second condenser (24).
8. A humidity step processing device in low humidity environment as claimed in claim 1, 2 or 3, wherein the cold source used in the first surface air cooler (4) is chilled water with inlet temperature of 7 ℃.
9. A humidity step processing device in low humidity environment as claimed in claim 1, 2 or 3, wherein the cold source used in the second surface air cooler (12) is chilled water with inlet temperature of 7 ℃.
10. A humidity step processing device in low humidity environment as claimed in claim 1, 2 or 3, wherein the cold source used in the third surface cooler (15) is chilled water with inlet temperature of 7 ℃.
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