A heat recovery energy storage system for large-scale food freeze-drying warehouses

Abstract

This utility model discloses a heat recovery and energy storage system for a large-scale food freeze-drying warehouse, comprising a heat storage and insulation water tank, a refrigeration unit exhaust coil and a variable frequency high-temperature heat pump unit exhaust coil installed within the water tank, and a variable frequency high-temperature heat pump recovery unit. When the freezer begins to cool and freeze, the refrigeration compressor unit operates. If the water temperature inside the heat storage and insulation water tank is lower than the condensing temperature during normal refrigeration operation, the heat from the refrigeration unit's exhaust pipe is recovered through the exhaust coil to heat the water tank. When the temperature inside the water tank approaches the condensing temperature of the refrigeration system, the variable frequency high-temperature heat pump unit recovers heat from the refrigeration unit's exhaust pipe to heat the water tank to the set temperature, storing the energy to provide the heat source needed for heating the shelf heating plates. This energy recovery and storage of the exhaust heat during refrigeration unit operation significantly reduces the overall energy consumption of the freeze-drying system.

Description

Technical Field

[0001] This utility model relates to the field of food freeze-drying, specifically a heat recovery and energy storage system applied to large-scale food freeze-drying warehouses. Background Technology

[0002] In recent years, freeze-dried foods have gradually become popular in people's lives. In the field of food drying, freeze-dried foods are widely used by many food processing companies because they can better preserve the flavor of food and are suitable for drying a wider variety of foods.

[0003] However, the current freeze-drying process for food is quite costly, mainly due to the electricity consumed by the refrigeration unit and the traditional shelf electric heating system. Furthermore, during operation, the refrigeration unit releases heat into the atmosphere, leading to increased ambient temperature and energy waste. Utility Model Content

[0004] The purpose of this invention is to solve the above problems and provide a heat recovery energy storage system for large-scale food freeze-drying warehouses, which greatly reduces the overall energy consumption of the freeze-drying system, saving energy and reducing emissions.

[0005] The technical solution adopted by this utility model to solve its technical problem is:

[0006] A heat recovery energy storage system for a large-scale food freeze-drying warehouse includes a refrigeration compressor unit, an evaporative condenser, a quick-freezing chamber, a quick-freezing chamber air cooler, a freeze-drying chamber water trap, shelf heating plates, shelf heating circulating water pumps, and shelf heating heat exchange plates. It also includes a heat storage and insulation water tank, a refrigeration unit exhaust coil and a variable frequency high-temperature heat pump unit exhaust coil installed within the heat storage and insulation water tank, and a variable frequency high-temperature heat pump recovery unit. The heat storage and insulation water tank is connected to the shelf heating heat exchange plates via pipes. The refrigeration unit exhaust coil is connected to the exhaust pipe of the refrigeration compressor unit, and the variable frequency high-temperature heat pump recovery unit is connected to and connected to the refrigeration unit exhaust coil.

[0007] Furthermore, the pipe connecting the thermal storage and insulation water tank to the shelf heating heat exchange plate is equipped with an electric butterfly valve and a heat exchange plate hot water supply pump.

[0008] Furthermore, the heat dissipation coil of the refrigeration unit is equipped with an electric ball valve.

[0009] Furthermore, the refrigeration unit's heat dissipation coil is equipped with a pressure relief pipe, and the pressure relief pipe is equipped with a pressure relief valve.

[0010] Furthermore, the side of the thermal storage and insulation water tank is equipped with a water level switch and a water temperature sensor.

[0011] Furthermore, the heat storage and insulation water tank is also equipped with a defrosting water heat exchange coil.

[0012] Furthermore, a cold well defrosting water pump is installed at the inlet end of the defrosting water heat exchange coil, and a cold well decanter defrosting spray pipe is installed at the outlet end of the defrosting water heat exchange coil.

[0013] The beneficial effects of this utility model are:

[0014] 1. This utility model also includes a thermal storage and insulation water tank, a refrigeration unit heat dissipation coil and a variable frequency high-temperature heat pump unit heat dissipation coil installed inside the thermal storage and insulation water tank, and a variable frequency high-temperature heat pump recovery unit. When the quick-freezing chamber begins to cool down and freeze, the refrigeration compressor unit operates. If the water temperature inside the thermal storage and insulation water tank is lower than the condensing temperature during normal refrigeration operation, the electric ball valve can be opened to recover heat from the refrigeration unit's exhaust pipe through the heat dissipation coil to heat the thermal storage and insulation water tank. When the temperature inside the thermal storage and insulation water tank approaches the condensing temperature of the refrigeration system, the electric ball valve is closed, and the variable frequency high-temperature heat pump unit recovers heat from the refrigeration unit's exhaust pipe to heat the water tank to the set temperature, thus storing energy to provide the heat source required for heating the shelf heating plate. Recovering and storing the heat dissipated during the operation of the refrigeration unit significantly reduces the overall energy consumption of the freeze-drying system, saving energy, reducing emissions, and saving continuous production and processing time. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the present invention.

[0017] In the diagram: 1. Refrigeration compressor unit, 2. Evaporative condenser, 3. Quick-freezing storage, 4. Quick-freezing storage air cooler, 5. Freeze-drying chamber water trap, 6. Shelf heating plate, 7. Shelf heating circulating water pump, 8. Shelf heating heat exchange plate, 9. Electric butterfly valve, 10. Heat exchange plate hot water pump, 11. Variable frequency high-temperature heat pump recovery unit, 12. Electric ball valve, 13. Thermal storage and insulation water tank, 14. Refrigeration unit heat exhaust coil, 15. Variable frequency high-temperature heat pump unit heat exhaust coil, 16. Water tank level switch, 17. Water tank temperature sensor, 18. Cold well defrosting water pump, 19. Cold well pipeline defrosting spray pipe, 20. Defrosting water heat exchange coil, 21. Pressure relief valve. Detailed Implementation

[0018] To enable those skilled in the art to better understand the technical solutions of this utility model, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of this utility model.

[0019] like Figure 1 As shown, a heat recovery energy storage system for a large-scale food freeze-drying warehouse includes a refrigeration compressor unit 1, an evaporative condenser 2, a quick-freezing chamber 3, a quick-freezing chamber air cooler 4, a freeze-drying chamber water trap 5, a shelf heating plate 6, a shelf heating circulating water pump 7, and a shelf heating heat exchange plate 8. It also includes a heat storage and insulation water tank 13, a refrigeration unit exhaust coil 14 and a variable frequency high-temperature heat pump unit exhaust coil 15, and a variable frequency high-temperature heat pump recovery unit 11, all housed within the heat storage and insulation water tank 13. The heat storage and insulation water tank 13 is connected to the shelf heating heat exchange plate 8 via pipes. The refrigeration unit exhaust coil 14 is connected to the exhaust pipe of the refrigeration compressor unit 1. The variable frequency high-temperature heat pump recovery unit 11 is connected to the variable frequency high-temperature heat pump unit exhaust coil 15 and also connected to the refrigeration unit exhaust coil 14.

[0020] The large-scale food freeze-drying process is divided into two main parts: quick-freezing of food and freeze-drying in a freeze-drying chamber. First, the refrigeration units of the two refrigeration systems are integrated and share a single evaporative condenser for heat dissipation. This ensures that there is a heat source for heat recovery whether it is the first shipment or continuous production.

[0021] When the quick-freezing chamber 3 begins cooling and quick-freezing, the refrigeration compressor unit 1 operates. If the internal water temperature of the heat storage and insulation water tank 13 is lower than the condensing temperature during normal refrigeration operation, we can open the electric ball valve 12 to recover heat from the exhaust pipe of the refrigeration unit 1 through the heat dissipation coil 14 to heat the heat storage and insulation water tank 13. When the internal temperature of the heat storage and insulation water tank 13 approaches the condensing temperature of the refrigeration system, the electric ball valve 12 is closed, and the variable frequency high-temperature heat pump unit 11 recovers heat from the exhaust pipe of the refrigeration unit 1 to heat the heat storage and insulation water tank 13 to the set temperature (e.g., 80 degrees Celsius) to provide the heat source required for heating the shelf heating plate 6. The opening degree of the electric butterfly valve 9 is used to adjust the temperature required for heating the shelf heating plate 6. After the freeze-drying chamber is operating normally, we can also use the variable frequency operation of the variable frequency high-temperature heat pump unit 11 to ensure that the heat recovered from the exhaust pipe of the refrigeration unit 1 matches the heating heat required by the freeze-drying system. By recovering and storing the heat generated during the operation of the refrigeration unit, the overall energy consumption of the freeze-drying system is greatly reduced, resulting in energy saving, emission reduction, and saving continuous production and processing time.

[0022] The pipe connecting the thermal storage and insulation water tank 13 to the shelf heating heat exchange plate 8 is equipped with an electric butterfly valve 9 and a heat exchange plate hot water pump 10. Heat is recovered from the refrigeration unit's exhaust heat to provide heat to the heating shelves in the freeze-drying chamber. Depending on the freeze-drying process of different materials, the required maximum temperature of the heating shelves varies. Therefore, we can determine the final heating stop temperature of the insulation water tank based on the maximum heating temperature of the material. For example, if the heating shelf requires a plate temperature of 60 degrees Celsius, and the temperature difference of the heat exchange plate is calculated at 5 degrees Celsius, the temperature inside the insulation water tank should not be lower than 65 degrees Celsius. To ensure a sufficient heat source, we can set the internal temperature of the insulation water tank to 80 degrees Celsius. The opening degree of the electric butterfly valve before the shelf heating heat exchange plate is used to ensure that the temperature of the heating shelf is always maintained at the required temperature.

[0023] An electric ball valve 12 is installed on the heat dissipation coil 14 of the refrigeration unit.

[0024] The refrigeration unit's heat dissipation coil 14 is equipped with a pressure relief pipe, and the pressure relief pipe is equipped with a pressure relief valve 21.

[0025] The side of the thermal storage and insulation water tank 13 is equipped with a water tank level switch 16 and a water tank temperature sensor 17.

[0026] The heat storage and insulation water tank 13 is also equipped with a defrosting water heat exchange coil 20.

[0027] The inlet end of the defrosting water heat exchange coil 20 is equipped with a cold well defrosting water pump 18, and the outlet end of the defrosting water heat exchange coil 20 is equipped with a cold well pipe defrosting spray pipe 19.

[0028] After the freeze-drying chamber ships normally, we need to melt the ice layer on the freeze-drying chamber water trap 5. In order to shorten the corresponding defrosting speed, speed up the entry time of the next chamber, and save the defrosting waiting time in the continuous production process, the defrosting water heat exchange coil 20 uses the internal heat of the energy storage and heat preservation water tank 13 to deliver the water to the cold well defrosting pipe spray pipe 19 through the cold well defrosting water pump 18 to quickly melt the ice layer on the freeze-drying chamber water trap 5, shortening the time of the next entry into the chamber, saving time, energy and efficiency.

[0029] In the description of this utility model, it should be noted that the terms "left", "right", "up", "down", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0030] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

Claims

1. A heat recovery energy storage system applied to a large food freeze-drying warehouse, comprising a refrigeration compressor unit (1), an evaporative condenser (2), a quick-freezing warehouse (3), a quick-freezing warehouse cold air fan (4), a freeze-drying warehouse water catcher (5), a shelf heating plate (6), a shelf heating circulating water pump (7), and a shelf heating heat exchange plate (8), characterized in that, It also includes a thermal storage and insulation water tank (13), a refrigeration unit heat dissipation coil (14) and a variable frequency high temperature heat pump unit heat dissipation coil (15) installed in the thermal storage and insulation water tank (13), and a variable frequency high temperature heat pump recovery unit (11). The thermal storage and insulation water tank (13) is connected to the shelf heating heat exchange plate (8) through a pipe. The refrigeration unit heat dissipation coil (14) is connected to the exhaust pipe of the refrigeration compressor unit (1). The variable frequency high temperature heat pump recovery unit (11) is connected to the variable frequency high temperature heat pump unit heat dissipation coil (15) and connected to the refrigeration unit heat dissipation coil (14).

2. A heat recovery energy storage system for use in a large scale food freeze-drying chamber as claimed in claim 1, characterized in that, The pipe connecting the thermal storage and insulation water tank (13) and the shelf heating heat exchange plate (8) is equipped with an electric butterfly valve (9) and a heat exchange plate hot water pump (10).

3. A heat recovery and energy storage system for use in a large scale food freeze-drying chamber as claimed in claim 1, characterized in that, An electric ball valve (12) is provided on the heat dissipation coil (14) of the refrigeration unit.

4. A heat recovery and energy storage system for use in a large scale food freeze-drying chamber as claimed in claim 1, wherein, The refrigeration unit's heat dissipation coil (14) is equipped with a pressure relief pipe, and the pressure relief pipe is equipped with a pressure relief valve (21).

5. A heat recovery energy storage system for use in a large scale food freeze drying chamber as claimed in claim 1, wherein, The thermal storage and insulation water tank (13) is equipped with a water tank level switch (16) and a water tank temperature sensor (17) on its side.

6. A heat recovery energy storage system for use in a large scale food freeze drying chamber as claimed in claim 1, wherein, The heat storage and insulation water tank (13) is also equipped with a defrosting water heat exchange coil (20).

7. A heat recovery energy storage system for use in a large scale food freeze drying chamber as claimed in claim 1, wherein, The inlet end of the defrosting water heat exchange coil (20) is equipped with a cold well defrosting water pump (18), and the outlet end of the defrosting water heat exchange coil (20) is equipped with a cold well pipe defrosting spray pipe (19).

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