Waste heat recovery refrigeration house defrosting device assisted by solar energy

Abstract

The utility model discloses a waste heat recovery refrigeration house defrosting device assisted by solar energy, which comprises a condenser, an evaporator, a compressor and a heat storage agent storage device, and is characterized in that the condenser is fixedly communicated with the liquid inlet end of a throttle valve through a pipeline, the liquid outlet end of the throttle valve is fixedly communicated with the evaporator through a pipeline, and the compressor is communicated with the heat storage agent storage device through a pipeline. The evaporator is fixedly communicated with the compressor through a pipeline, the compressor is fixedly communicated with the condenser through a first heat exchange pipeline, the first heat exchange pipeline penetrates through the waste heat recovery heat exchanger, and the liquid outlet end of the waste heat pump is fixedly communicated with a liquid inlet in one end of the heat storage agent storage device through a second heat exchange pipeline. The second heat exchange pipeline penetrates through the waste heat recovery heat exchanger. According to the utility model, an energy solution of'waste heat + solar energy 'defrosting is adopted, additional energy consumption is not needed, the energy consumption required by defrosting is greatly reduced, and non-stop defrosting in the defrosting process is realized.

Description

Technical Field

[0001] The utility model relates to the technical field of defrosting, in particular to a cold storage defrosting device assisted by solar energy for waste heat recovery. Background Art

[0002] This year, my country's refrigeration industry has developed rapidly, and the number of cold storages has increased year by year. By the end of 2023, the number of cold storages has reached 103.23 million tons, which is a huge volume. Such a huge volume of cold storage consumes a lot of energy during operation, and defrosting accounts for a relatively high proportion of energy consumption in the operation of cold storage.

[0003] At present, the power consumption index of cold storage in my country is generally high during actual operation, with a total annual power consumption of about 15 billion kWh and a unit volume energy consumption of 30 to 50 kWh. With the increase in the capacity of cold storage in my country in the next few years, the total energy consumption of cold storage will continue to rise. On the other hand, these data also mean that my country's cold storage has considerable energy-saving potential. The defrosting process is indispensable in the operation of cold storage and is also a production process with high energy consumption. The energy consumption of the defrosting process accounts for 15% to 30% of the energy consumption in the system, which accounts for a high proportion of energy consumption and has a large energy-saving space.

[0004] The existing defrosting methods have the following defects:

[0005] 1. Electric defrost: Electric defrost is commonly used in small and medium-sized cold storages. It requires additional electricity to achieve the defrosting effect, with high energy consumption and high operating costs. 2. Hot fluorine defrost: Hot fluorine defrost is commonly used in small and medium-sized cold storages. It requires special valves and equipment, is more complex, has inaccurate defrosting process control, and has large fluctuations in storage temperature. 3. Hot water defrosting: Hot water defrosting is suitable for small and medium-sized cold storages. It requires a large amount of water and takes a long time to clear. It is easy to cause fluctuations in the temperature of the storage, affecting the quality of the frozen products in the cold storage.

[0006] The above defrosting methods all require extra energy consumption and lack effective energy-saving methods, resulting in problems such as high defrosting energy consumption, incomplete defrosting, and large fluctuations in storage temperature.

[0007] Therefore, it is necessary to provide a waste heat recovery cold storage defrosting device assisted by solar energy to solve the above technical problems. Utility Model Content

[0008] The utility model aims to solve the shortcomings in the prior art and proposes a cold storage defrosting device which is supplemented by solar energy and recovers waste heat.

[0009] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0010] A defrosting device for a cold storage assisted by solar energy waste heat recovery comprises a condenser, an evaporator, a compressor and a heat storage agent storage, characterized in that the condenser is fixedly connected to a liquid inlet end of a throttle valve through a pipeline, the liquid outlet end of the throttle valve is fixedly connected to the evaporator through a pipeline, the evaporator is fixedly connected to the compressor through a pipeline, the compressor is fixedly connected to the condenser through a heat exchange pipeline 1, and the heat exchange pipeline 1 passes through a waste heat recovery heat exchanger;

[0011] The liquid outlet of the waste heat pump is fixedly connected to the liquid inlet at one end of the heat storage agent storage via heat exchange pipe 2, the heat exchange pipe 2 passes through the waste heat recovery heat exchanger, and the liquid outlet at one end of the heat storage agent storage is fixedly connected to the liquid inlet of the waste heat pump via a pipe.

[0012] Preferably, the liquid outlet at one end of the heat storage agent reservoir is fixedly connected to the liquid inlet of a defrost pump through a pipe, the liquid outlet of the defrost pump is fixedly connected to the liquid inlet of the heat storage agent reservoir through a defrost pipe, and the defrost pipe passes through the interior of the evaporator.

[0013] Preferably, a liquid outlet at one end of the heat storage agent reservoir is fixedly connected to a liquid inlet of a solar thermal collector via a pipeline, and a liquid outlet of the solar thermal collector is fixedly connected to a liquid inlet of the heat storage agent reservoir via a pipeline.

[0014] Preferably, the heat exchange pipe 1 and the heat exchange pipe 2 in the waste heat recovery heat exchanger are arranged in an S shape and fit together, which is conducive to heat transfer.

[0015] Compared with the related art, the beneficial effects of the utility model are:

[0016] This device adopts the energy solution of "waste heat + solar energy" for defrosting. It mainly uses heat storage agent to absorb the waste heat of compressor exhaust and combines with the auxiliary heat of solar collector to defrost (compressor exhaust waste heat refers to the heat of superheated gas discharged by the compressor). The recovery efficiency is high. The two heat energies are sufficient to maintain the energy consumption of defrosting. No additional energy consumption is required, which greatly reduces the energy consumption required for defrosting and realizes non-stop defrosting during the defrosting process.

[0017] This device adopts the method of defrosting using liquid heat storage agent, which has large heat load, fast defrosting speed, thorough defrosting, and small storage temperature fluctuation. This defrosting method actively responds to the national strategic background of carbon peak and carbon neutrality, and can radiate and drive the development of the entire refrigeration industry. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the principle of the utility model.

[0019] In the figure:

[0020] 1. Condenser, 2. Evaporator, 3. Compressor, 4. Heat storage device, 5. Solar collector, 6. Throttle valve, 7. Waste heat recovery heat exchanger, 8. Waste heat pump, 9. Defrost pump, 10. Heat exchange pipe 1, 11. Heat exchange pipe 2, 12. Defrost pipe. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0022] A defrosting device for a cold storage assisted by solar energy for waste heat recovery comprises a condenser 1, an evaporator 2, a compressor 3 and a heat storage agent storage 4, wherein the condenser 1 is fixedly connected to a liquid inlet end of a throttle valve 6 through a pipeline, and a liquid outlet end of the throttle valve 6 is fixedly connected to the evaporator 2 through a pipeline, and the evaporator 2 is fixedly connected to the compressor 3 through a pipeline, and the compressor 3 is fixedly connected to the condenser 1 through a heat exchange pipeline 10, and the heat exchange pipeline 10 passes through a waste heat recovery heat exchanger 7;

[0023] The liquid outlet of the waste heat pump 8 is fixedly connected to the liquid inlet at one end of the heat storage agent reservoir 4 through a heat exchange pipe 11. The heat exchange pipe 11 passes through the waste heat recovery heat exchanger 7. The liquid outlet at one end of the heat storage agent reservoir 4 is fixedly connected to the liquid inlet of the waste heat pump 8 through a pipe.

[0024] The liquid outlet at one end of the heat storage agent reservoir 4 is fixedly connected to the liquid inlet of the defrost pump 9 through a pipeline, and the liquid outlet of the defrost pump 9 is fixedly connected to the liquid inlet of the heat storage agent reservoir 4 through a defrost pipeline 12, and the defrost pipeline 12 passes through the interior of the evaporator 2.

[0025] The liquid outlet at one end of the heat storage agent storage 4 is fixedly connected to the liquid inlet of the solar thermal collector 5 through a pipeline, and the liquid outlet of the solar thermal collector 5 is fixedly connected to the liquid inlet of the heat storage agent storage 4 through a pipeline.

[0026] The heat exchange pipe 1 10 and the heat exchange pipe 2 11 in the waste heat recovery heat exchanger 7 are arranged in an S shape and fit together, which is conducive to heat transfer.

[0027] Working principle: The condensed refrigerant liquid enters the throttle valve 6 through the outlet of the condenser 1, and the throttled refrigerant wet steam enters the evaporator 2 to exchange heat with the cooling medium. After the heat exchange is completed, it evaporates into gas and enters the compressor 3 for compression. The compressed high-temperature and high-pressure refrigerant gas enters the waste heat recovery heat exchanger 7 through the heat exchange pipe 10, exchanges heat with the heat storage agent in the heat exchange pipe 2 11 on the other side of the waste heat recovery heat exchanger 7, and then enters the condenser 1 to be condensed into liquid.

[0028] The heat storage agent whose temperature is lowered after defrosting and stored in the heat storage agent storage device 4 is transported to the waste heat recovery heat exchanger 7 through the waste heat pump 8 and the heat exchange pipe 11 to exchange heat with the high-temperature and high-pressure refrigerant gas in the heat exchange pipe 10 on the other side, and then returns to the heat storage agent storage device 4. After continuous circulation of heat exchange, the temperature of the heat storage agent rises, and it is stored in the heat storage agent storage device 4 waiting for defrosting.

[0029] When the frost on the evaporator 2 reaches a certain thickness, the high-temperature heat storage agent in the heat storage agent reservoir 4 is pumped into the evaporator 2 through the defrost pump 9 and the defrost pipe 12 for defrosting, and the heat storage agent with a reduced temperature after defrosting returns to the heat storage agent reservoir 4.

[0030] When the temperature of the stored heat storage agent in the heat storage agent storage device 4 is not sufficient to meet the defrosting requirements of the evaporator 2, the present solution uses solar energy to supplement heat. The heat storage agent storage device 4 is heated by the solar thermal collector 5. After being heated, the heat storage agent flows back from the upper part of the solar thermal collector 5 to the heat storage agent storage device 4.

[0031] Beneficial effect: This device adopts the energy solution of "waste heat + solar energy" for defrosting, which mainly uses the heat storage agent to absorb the exhaust waste heat of the compressor 3 and the auxiliary heat of the solar collector 5 to defrost (the compressor exhaust waste heat refers to the heat of the superheated gas discharged by the compressor), with high recovery efficiency and good defrosting effect.

[0032] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A cold storage defrosting device assisted by solar energy waste heat recovery, comprising a condenser (1), an evaporator (2), a compressor (3) and a heat storage agent storage device (4), characterized in that: The condenser (1) is fixedly connected to the liquid inlet of the throttle valve (6) through a pipeline, the liquid outlet of the throttle valve (6) is fixedly connected to the evaporator (2) through a pipeline, the evaporator (2) is fixedly connected to the compressor (3) through a pipeline, the compressor (3) is fixedly connected to the condenser (1) through a heat exchange pipeline (10), and the heat exchange pipeline (10) passes through the waste heat recovery heat exchanger (7); The liquid outlet of the waste heat pump (8) is fixedly connected to the liquid inlet at one end of the heat storage agent storage device (4) via a second heat exchange pipe (11); the second heat exchange pipe (11) passes through the waste heat recovery heat exchanger (7); and the liquid outlet at one end of the heat storage agent storage device (4) is fixedly connected to the liquid inlet of the waste heat pump (8) via a pipe.

2. The cold storage defrosting device assisted by solar energy waste heat recovery according to claim 1 is characterized in that: The liquid outlet at one end of the heat storage agent reservoir (4) is fixedly connected to the liquid inlet of the defrost pump (9) via a pipeline, and the liquid outlet of the defrost pump (9) is fixedly connected to the liquid inlet of the heat storage agent reservoir (4) via a defrost pipeline (12), and the defrost pipeline (12) passes through the interior of the evaporator (2).

3. The cold storage defrosting device assisted by solar energy waste heat recovery according to claim 1 is characterized in that: The liquid outlet at one end of the heat storage agent storage device (4) is fixedly connected to the liquid inlet of the solar thermal collector (5) through a pipeline, and the liquid outlet of the solar thermal collector (5) is fixedly connected to the liquid inlet of the heat storage agent storage device (4) through a pipeline.

4. The cold storage defrosting device assisted by solar energy waste heat recovery according to claim 1 is characterized in that: The heat exchange pipe 1 (10) and the heat exchange pipe 2 (11) in the waste heat recovery heat exchanger (7) are arranged in an S shape and fit each other, which is conducive to heat transfer.

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