CN102661660A - Refrigerating system waste heat recovery and solar-assisted heating and drying device - Google Patents

Abstract

A refrigeration system waste heat recovery-solar-assisted heating and drying device, the first outdoor fresh air inlet is connected to drying through the first damper (22), the first fan (23), the dehumidification evaporator (4), and the exhaust heat recovery device (5) room (7); the second outdoor fresh air inlet (17) is connected to the drying room through the solar air heat collector (1), the second fan (2), and the second damper (3); the circulating air outlet of the drying room is through the valve (20 ) is connected to the dehumidification evaporator, and the air outlet of the drying room is connected to the third fan (9) and the third damper (8); among them, the gaseous refrigerant inlet of the exhaust heat recovery device passes through the second shut-off valve (18) and the cold storage The exhaust pipe (13) of the refrigeration system is connected, and the liquid refrigerant outlet is connected to the condensate discharge pipe (14) of the refrigeration system of the cold storage through the third stop valve (19); the refrigerant inlet of the dehumidification evaporator is connected to the The liquid supply pipe (15) of the refrigeration system of the cold storage is connected, and the refrigerant outlet is connected with the air return pipe (16) of the refrigeration system of the cold storage through the first stop valve (10). The invention can not only save conventional energy, but also obtain remarkable economic benefits, and is suitable for drying processing of food, especially agricultural by-products.

Description

Refrigeration System Waste Heat Recovery - Solar Auxiliary Heating and Drying Device

the

technical field

The invention belongs to a heating and drying device, specifically, a refrigeration system waste heat recovery-solar-assisted heating and drying device. The device can be adjusted and used in time according to the drying process and process, and the energy consumption of product drying can be reduced.

Background technique

As the main link of cold chain logistics, cold storage consumes a lot of energy. The cold storage refrigeration system is composed of a compressor, a condenser, a throttling device, an evaporator and auxiliary equipment. The low-temperature and low-pressure refrigerant vapor is sucked into the compressor through the suction pipe, and is compressed to generate high-temperature and high-pressure refrigerant vapor. The condenser condenses the refrigerant into a low-temperature and high-pressure liquid, and then throttles it through the throttle valve to become a low-temperature and low-pressure liquid refrigerant. The liquid refrigerant evaporates and absorbs heat in the evaporator to achieve the purpose of refrigeration. The cooling capacity of the refrigeration system in the cold storage is generally large, and the heat discharged by the corresponding condenser is also large. The condensers in the existing large and medium-sized cold storage generally discharge the condensation heat directly into the environment as waste heat, which not only causes environmental pollution. Heat pollution, but also a waste of energy. There are drying processes in many cold storages. Drying is a process of removing moisture from materials through heat and mass transfer. The energy required is mainly thermal energy, and drying is also a process with high energy consumption. Using the waste heat recovery in the refrigeration system for food freezing processing for energy consumption in food drying will help improve the energy consumption coefficient in food industrial production, reduce energy consumption per unit of product, and achieve the purpose of energy saving and emission reduction.

Solar energy is a clean and renewable energy source. The use of solar drying equipment can dry agricultural and sideline products. Because the temperature level required for the drying of general agricultural and sideline products and food is not very high, it is between 40 and 70 ° C, which is different from the use of solar heat. Therefore, while using the heat released by the condenser of the cold storage for drying, it is also possible to use solar energy for auxiliary heating in stages and according to the process according to the different requirements for temperature conditions in the food drying process, which can save Conventional energy can also obtain significant economic benefits.

Contents of the invention

The object of the present invention is to provide a refrigeration system waste heat recovery-solar-assisted heating and drying device with remarkable energy-saving effect.

In the refrigeration system waste heat recovery-solar-assisted heating and drying device provided by the present invention, the first outdoor fresh air inlet is connected to the drying room through the first damper, the first fan, the dehumidification evaporator, and the exhaust heat recovery device; the second outdoor fresh air inlet is connected to the drying chamber through the solar air The heat collector, the second fan, and the second air door are connected to the drying chamber; the circulating air outlet of the drying chamber is connected to the dehumidification evaporator through a valve, and the air outlet of the drying chamber is connected to the third fan and the third air door;

Among them, the gaseous refrigerant inlet of the exhaust heat recovery device is connected to the exhaust pipe of the refrigeration system of the cold storage through the second cut-off valve, and the outlet of the liquid refrigerant is connected to the condensate discharge pipe of the refrigeration system of the cold storage through the third cut-off valve; the refrigeration of the dehumidification evaporator The refrigerant inlet is connected to the liquid supply pipe of the refrigeration system of the cold storage through a throttle valve, and the refrigerant outlet is connected to the air return pipe of the refrigeration system of the cold storage through a first cut-off valve.

In the above, the exhaust heat recovery device and the second air door are connected to the drying chamber through the gas collection chamber; the bottom of the dehumidification evaporator is connected to a drain valve.

The invention combines a large-scale refrigeration system with a solar air heat collector, uses the heat exhausted by the condenser of the refrigeration system and the heat of the sun to provide the energy required in the drying process, drives the drying process, and cooperates with the process through the dehumidification evaporator Low-temperature dehumidification is carried out for the transformation of the process stage, and an open and closed drying device suitable for process transformation is formed. the

According to different climate conditions, the present invention can use cold storage refrigeration system condensation heat recovery, solar air heat collector heating, cold storage refrigeration system low temperature dehumidification and other ways to dry alone or in combination. According to the different parameters of the dehumidification process, the device can adopt open, closed or semi-open circulation. Open circulation means that all the dry air is taken from the outside and is used for drying after being treated by the device, and all the dried air is discharged to the outdoor environment; closed circulation means that the dry air uses indoor recirculated air without outdoor fresh air The introduction, the dried air is re-circulated after being treated by the device; the semi-open cycle means that part of the dry air is taken from the outdoor fresh air, and part of it is from the indoor circulating air, and the mixed air of the fresh air and the circulating air is used for drying after being treated by the device. , part of the dried air is recycled, and the other part is discharged outside.

The invention can not only save conventional energy, but also obtain remarkable economic benefits, and is suitable for drying processing of food, especially agricultural by-products.

Description of drawings

Fig. 1 is a schematic flow diagram of the device of the present invention.

Detailed ways

Referring to Fig. 1, the waste heat recovery of the refrigeration system provided by the present invention-solar assisted heating and drying device, the first outdoor fresh air inlet passes through the first damper 22, the first fan 23, the dehumidification evaporator 4, and the exhaust heat recovery device 5 through the gas collection chamber 6 is then connected to the drying chamber 7, the dehumidification evaporator 4 and the exhaust heat recovery device 5 are installed in a box 21; the second outdoor fresh air inlet 17 passes through the solar air heat collector 1, the second fan 2, and the second damper 3 The air collecting chamber 6 is then connected to the drying chamber 7; the circulating air outlet of the drying chamber 7 is connected to the dehumidification evaporator 4 through the valve 20, and the air outlet of the drying chamber 7 is connected to the third fan 9 and the third damper 8.

In the above, the gaseous refrigerant inlet of the exhaust heat recovery device 5 is connected to the exhaust pipe 13 of the refrigeration system of the cold storage through the second cut-off valve 18, and the outlet of the liquid refrigerant is connected to the condensate discharge pipe 14 of the refrigeration system of the cold storage through the third cut-off valve 19 The refrigerant inlet of the dehumidification evaporator 4 is connected to the liquid supply pipe 15 of the refrigeration system of the cold storage through the throttle valve 11, and the outlet of the refrigerant is connected to the air return pipe 16 of the refrigeration system of the cold storage through the first stop valve 10; the bottom of the dehumidification evaporator 4 is connected with Drain valve 12.

In the present invention, all of the above can be installed on a drying box assembled by insulation boards. The partition board divides the drying box into upper and lower layers. The lower layer is the drying room, and the solar air heat collector is installed on the top of the drying box.

When the present invention is applied, the two paths of fresh air introduced from the first outdoor fresh air inlet and the second outdoor fresh air inlet can be introduced into one of them at the same time or only separately to perform the above-mentioned open and semi-open operations, or no fresh air can be introduced. And use the air in the device for closed operation. specifically is:

Open type: the outdoor fresh air of one road is introduced into the solar air heat collector 1 through the second outdoor fresh air inlet 17 to be heated, and then enters the gas collection chamber 6 through the second fan 2 and the second damper 3. At the same time, the outdoor air of the other road passes through the second An outdoor fresh air inlet, the first damper 22, the first fan 23, the dehumidification evaporator 4, and the exhaust heat recovery device 5 also enter the air collection chamber 6 after being processed into high-temperature and low-humidity air, and enter the drying chamber 7 after the two-way air is mixed. Close the valve 20 at the same time, start the third fan 9 and the third damper 8 of the air outlet of the drying chamber 7, and after exchanging heat and mass with the items to be dried in the drying chamber 7, the air passes through the third damper 8 of the drying chamber 7 And the third fan 9 is discharged.

Also can close the first damper 22 or the second damper 3, just introduce wherein all the way new wind.

Closed type: close the first damper 22 and the second damper 3, open the valve 20, start the dehumidification evaporator 4, and the exhaust heat recovery device 5 to use the air in the system, and the dried air is recycled after being processed by the device.

Semi-open type: the outdoor air of one road is introduced into the solar air heat collector 1 through the second outdoor fresh air inlet 17 to be heated, then enters the gas collection chamber 6 through the second fan 2 and the second damper 3, and at the same time, the outdoor air of the other road passes through The first outdoor fresh air inlet, the first damper 22, the first fan 23, the dehumidification evaporator 4, and the exhaust heat recovery device 5 also enter the air collection chamber 6 after being processed into high-temperature and low-humidity air, and enter the drying chamber 7 after the two-way air is mixed. After exchanging heat and mass with the items to be dried in the drying chamber 7, part of the air is circulated through the circulating air outlet of the drying chamber 7, and part of the air is discharged by the third damper 8 and the third fan 9 of the drying chamber 7. The amount is equal to the sum of the fresh air volume introduced by the solar air heat collector 1 and the fresh air volume introduced by the first fan 23, so as to ensure the air balance in the heating and drying box.

In the above, the dehumidification evaporator chooses to run or not according to the requirements and parameters of the dehumidification process. When the dehumidification evaporator is running, the throttle valve is opened, and the liquid refrigerant in the liquid supply pipe of the refrigeration system of the cold storage is throttled and depressurized and then enters the dehumidification process. Evaporator, because the surface temperature of the dehumidification evaporator is lower than the dew point temperature of the treated air, the air temperature decreases and condensed water is produced, the low-temperature and low-humidity air after cooling and dehumidification continues to flow through the exhaust heat recovery device, absorbing the heat released by the condenser, and becomes Air with high temperature and low humidity enters the plenum. In cloudy and rainy weather with weak solar radiation and other conditions, the solar air collector is not put into operation, and the exhaust heat recovery device is operated alone or the dehumidification evaporator and exhaust heat recovery device are operated jointly. At this time, the air system can adopt an open system , a closed system or a semi-open system; and under the condition of sunny weather and high temperature, the solar air collector works, and after the air is heated by the solar air collector, it is combined with the hot air from the exhaust heat recovery device, or The hot air from the dehumidification evaporator and the exhaust heat recovery device are mixed together to dry the product. At this time, the air system can adopt an open system and a semi-open system.

The invention can work together according to the requirements of refrigeration and drying, recycles the refrigeration system and utilizes solar energy to adjust external conditions and process conditions, and realizes the conversion and utilization of waste heat of the refrigeration system.

The arrangement of the piping connecting the device with the refrigerant of the refrigeration system must meet the requirements of the refrigeration process.

The above is a preferred embodiment of the present invention, but the embodiment of the present invention is not limited by the above implementation, and any other changes, modifications, substitutions, combinations, and simplifications that do not deviate from the spirit and principles of the present invention should be All equivalent replacement methods are included in the protection scope of the present invention.

Claims (3)

1. A refrigeration system waste heat recovery-solar assisted heating and drying device, characterized in that the first outdoor fresh air inlet passes through the first damper (22), the first fan (23), the dehumidification evaporator (4), and the exhaust heat recovery The device (5) is connected to the drying room (7); the second outdoor fresh air inlet (17) is connected to the drying room (7) through the solar air collector (1), the second fan (2), and the second damper (3); The circulating air outlet of the chamber (7) is connected to the dehumidification evaporator (4) through the valve (20), and the air outlet of the drying chamber (7) is connected to the third fan (9) and the third damper (8); Among them, the gaseous refrigerant inlet of the exhaust heat recovery device (5) is connected to the cold storage refrigeration system exhaust pipe (13) through the second cut-off valve (18), and the liquid refrigerant outlet is connected to the cold storage refrigeration system through the third cut-off valve (19). The system condensate discharge pipe (14) is connected; the refrigerant inlet of the dehumidification evaporator (4) is connected with the liquid supply pipe (15) of the refrigeration system of the cold storage through the throttle valve (11), and the refrigerant outlet is passed through the first stop valve (10) It is connected with the air return pipe (16) of the refrigeration system of the cold storage. 2. The refrigeration system waste heat recovery-solar assisted heating and drying device according to claim 1, characterized in that the exhaust heat recovery device (5) and the second damper (3) are connected to the drying chamber (6) through the air collection chamber (6). Room (7). 3. The refrigeration system waste heat recovery-solar assisted heating and drying device according to claim 1, characterized in that a drain valve (12) is connected to the bottom of the dehumidification evaporator (4).

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