Vacuum drying system

Abstract

The invention relates to the technical field of drying equipment, in particular to a vacuum drying system. The vacuum drying system provided by the invention comprises a dryer internally provided with a heat conduction part; the hot water tank is provided with a heater; the steam compressor is communicated with the dryer; the first heat exchanger communicates with an exhaust port of the steam compressor and is connected with the second pipeline; the condensate water tank is connected with the first heat exchanger; the condensate pump is communicated with the steam compressor and the condensate water tank; the cold water tank is communicated with the steam compressor and is suitable for collecting condensate water discharged by the steam compressor; the heat pump system comprises an evaporator and a condenser, the evaporator is connected with the cold water tank through a circulating pipeline, the evaporator is suitable for exchanging heat with water in the cold water tank, the condenser is connected with the second pipeline, and the condenser is suitable for exchanging heat with water in the second pipeline so as to heat the water in the second pipeline. According to the vacuum drying system provided by the invention, the energy consumption and carbon emission of the system can be reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of drying equipment, and particularly relates to a vacuum drying system. Background Art

[0002] Fruits and vegetables, grains, Chinese herbal medicines, etc. have a relatively high moisture content, and problems such as mildew and rot will occur during storage and transportation. Vacuum drying can reduce the moisture content of fruits and vegetables, grains, Chinese herbal medicines, etc., inhibit the growth of microorganisms, thereby extending the shelf life. It can also prevent chemical reactions such as oxidation of materials during the drying process and can also play a role in disinfection and sterilization.

[0003] Currently, the equipment of the vacuum drying system is complex and energy-consuming. The waste heat of the water vapor generated during operation and the waste heat generated during the operation of the vacuum unit are directly discharged, which will lead to problems such as energy waste and high carbon emissions. Summary of the Invention

[0004] The present invention provides a vacuum drying system, which can reduce the energy consumption and carbon emissions of the system.

[0005] A vacuum drying system provided by the present invention includes:

[0006] A dryer, internally provided with a heat conduction component, and the heat conduction component is provided with a flow channel for hot water to flow through;

[0007] A hot water tank, provided with a heater, the heater is adapted to heat the water in the hot water tank, the water outlet of the hot water tank is connected to the heat conduction component through a first pipeline, and the water return port of the hot water tank is connected to the heat conduction component through a second pipeline to form a circulating water path;

[0008] A steam compressor, connected to the dryer, and the steam compressor is adapted to compress the gas discharged from the dryer to form a high-temperature and high-pressure gas;

[0009] A first heat exchanger, connected to the exhaust port of the steam compressor and connected to the second pipeline, and the first heat exchanger is adapted to exchange heat between the high-temperature and high-pressure gas and the second pipeline;

[0010] A condensate tank, connected to the first heat exchanger, and adapted to collect the condensate formed by heat exchange and condensation of the high-temperature and high-pressure gas;

[0011] A condensate pump, connected to the steam compressor and the condensate tank, and adapted to pump the condensate into the steam compressor so that the condensate cools the steam compressor;

[0012] A cold water tank, connected to the steam compressor, and adapted to collect the condensate discharged from the steam compressor;

[0013] A heat pump system, including an evaporator and a condenser, wherein the evaporator is connected to the cold water tank through a circulation pipeline, the evaporator is adapted to exchange heat with the water in the cold water tank, the condenser is connected to the second pipeline, and the condenser is adapted to exchange heat with the water in the second pipeline to heat the water in the second pipeline.

[0014] The vacuum drying system provided by the present invention further includes:

[0015] A vacuum pump, which is respectively connected to the condensate water tank and the cold water tank.

[0016] The vacuum drying system provided by the present invention further includes:

[0017] An air release valve, which is arranged on the condensate water tank.

[0018] In the vacuum drying system provided by the present invention, the water inlet and the water outlet of the vacuum pump are respectively connected to the cold water tank to form a closed circulation pipeline.

[0019] In the vacuum drying system provided by the present invention, a hot water pump is arranged on the first pipeline, and the hot water pump is adapted to pump the water in the hot water tank into the flow channel of the heat conduction component.

[0020] In the vacuum drying system provided by the present invention, a cold water pump is arranged on the circulation pipeline connecting the evaporator and the cold water tank.

[0021] In the vacuum drying system provided by the present invention, the first heat exchanger is set as a plate heat exchanger.

[0022] In the vacuum drying system provided by the present invention, the heat pump system further includes a compressor and a throttle valve. The compressor is respectively connected to the evaporator and the condenser through a first refrigerant pipe, and the throttle valve is respectively connected to the evaporator and the condenser through a second refrigerant pipe.

[0023] In the vacuum drying system provided by the present invention, the heater is set as an electric heater.

[0024] In the vacuum drying system provided by the present invention, the dryer includes a housing, the housing has airtightness, the internal cavity of the housing is used to place materials, and the heat conduction component is arranged inside the housing.

[0025] The working process of the vacuum drying system provided by the present invention is as follows:

[0026] Turn on the heater in the hot water tank, heat the water in the hot water tank through the heater, and after the water temperature reaches the preset temperature, input it into the heat conduction component in the dryer through the first pipeline. Among them, materials are stored in the dryer, and the heat conduction component heats the materials in a heat conduction manner. The water discharged from the heat conduction component flows back to the hot water tank through the second pipeline.

[0027] After the heat conduction component heats the materials, the air humidity inside the dryer increases. At this time, turn on the steam compressor. The steam compressor inhales the humid air inside the dryer, creates a vacuum environment inside the dryer, and compresses and increases the enthalpy of the humid air into a high-temperature and high-pressure gas through the steam compressor. The high-temperature and high-pressure gas enters the first heat exchanger. The first heat exchanger can exchange heat between the high-temperature and high-pressure gas and the water in the second pipeline. In this way, the high-temperature and high-pressure gas can heat the water in the second pipeline. When the water in the second pipeline returns to the hot water tank, it has a higher temperature, which can reduce the energy consumption of the heater.

[0028] When the high-temperature and high-pressure gas exchanges heat in the first heat exchanger, it can condense to form condensed water, and the condensed water is collected in the condensed water tank. A condensate pump is arranged between the condensed water tank and the steam compressor, and the condensed water in the condensed water tank is pumped into the steam compressor through the condensate pump. Since heat is generated during the operation of the steam compressor, when the condensed water in the condensed water tank enters the steam compressor, on the one hand, it can cool the steam compressor, and on the other hand, it can use the heat energy generated by the operation of the steam compressor to increase the temperature of the condensed water. After the condensed water exchanges heat through the steam compressor, it enters the cold water tank.

[0029] The evaporator of the heat pump system is connected to the cold water tank through a circulation pipeline. The water in the cold water tank can exchange heat with the evaporator, and thus the evaporator can make full use of the heat energy contained in the water in the cold water tank. At the same time, the condenser of the heat pump system is connected to the second pipeline, and exchanges heat with the water in the second pipeline, thereby heating the water in the second pipeline. After the water in the second pipeline is heated, it returns to the hot water tank.

[0030] With such a setting, the technical solution provided by the present invention can make full use of the heat energy contained in the water vapor generated in the dryer and the heat energy generated during the operation of the steam compressor, thereby reducing the energy consumption of the heater and realizing the low-energy consumption and low-carbon operation of the system.

[0031] In a further technical solution, the water inlet and outlet of the vacuum pump are respectively connected to the cold water tank to form a closed-circuit pipeline. With such a setting, the heat energy generated during the operation of the vacuum pump can also be collected into the cold water tank through the closed-circuit pipeline and be exchanged and utilized by the evaporator of the heat pump system, thereby effectively utilizing the heat energy generated during the operation of the vacuum pump and further reducing the system energy consumption. Description of the Drawings

[0032] To more clearly illustrate the technical solutions in the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0033] Figure 1 It is a schematic structural diagram of the vacuum drying system in the embodiment of the present invention.

[0034] Reference numerals:

[0035] 1. Steam compressor; 2. First heat exchanger; 3. Evaporator; 4. Compressor; 5. Throttle valve; 6. Condenser; 7. Dryer; 8. Hot water tank; 9. Heater; 10. Hot water pump; 11. Heat conduction component; 12. Vacuum pump; 13. Condensate water tank; 14. Vent valve; 15. Condensate water pump; 16. Cold water tank; 17. Cold water pump. Detailed implementation manners

[0036] To make the objectives, technical solutions and advantages of the present invention clearer, the following will clearly and completely describe the technical solutions in the present invention with reference to the drawings in the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art without creative efforts based on the embodiments in the present invention belong to the scope of protection of the present invention.

[0037] In the description of the present invention, it should be understood that the orientation or positional relationships indicated by the terms "upper", "lower", "horizontal", "inner", "outer", etc. are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0038] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, "a plurality" means two or more unless otherwise specifically defined.

[0039] The vacuum drying system provided by the embodiment of the present invention includes a dryer 7, a hot water tank 8, a steam compressor 1, a first heat exchanger 2, a condensate water tank 13, a condensate water pump 15, a cold water tank 16 and a heat pump system.

[0040] Among them, in some embodiments, the dryer 7 includes a housing, which has good airtightness and heat insulation. Specifically, it can be surrounded by heat-insulating boards. The interior of the housing is used to place materials, such as fruits, vegetables and other materials. A heat-conducting component 11 is arranged inside the housing of the dryer 7. The heat-conducting component 11 is made of a heat-conducting material and has a flow channel for water to flow through. So that when hot water enters the heat-conducting component 11, the heat-conducting component 11 can exchange heat with the external environment to achieve the purpose of raising the temperature inside the dryer 7.

[0041] The hot water tank 8 is provided with a heater 9. The heater 9 is suitable for heating the water in the hot water tank 8. The water outlet of the hot water tank 8 is communicated with the heat-conducting component 11 through a first pipeline, and the water return port of the hot water tank 8 is communicated with the heat-conducting component 11 through a second pipeline to form a circulating water path. That is, the hot water in the hot water tank 8 flows into the heat-conducting component 11 through the first pipeline. After the heat-conducting component 11 exchanges heat with the inside of the dryer 7, it flows back to the hot water tank 8 through the second pipeline and circulates like this. In some embodiments, the heater 9 is set as an electric heater.

[0042] The steam compressor 1 is connected to the dryer 7. The steam compressor 1 is suitable for compressing the gas discharged from the dryer 7 to form a high-temperature and high-pressure gas. The gas discharged from the dryer 7 contains a large amount of water vapor. The steam compressor 1 compresses the gas discharged from the dryer 7 to increase the pressure and enthalpy of the gas to a high-temperature and high-pressure gas.

[0043] The first heat exchanger 2 is connected to the exhaust port of the steam compressor 1 and is also connected to the second pipeline. The first heat exchanger 2 is suitable for the high-temperature and high-pressure gas to exchange heat with the water in the second pipeline. The high-temperature and high-pressure gas enters the first heat exchanger 2. At the same time, the water in the second pipeline enters the first heat exchanger 2. The high-temperature and high-pressure gas exchanges heat with the water, and the water temperature rises and then is diverted to the hot water tank 8 through the second pipeline. And the high-temperature and high-pressure gas in the first heat exchanger 2 will condense to form condensed water after cooling.

[0044] The condensate tank 13 is connected to the first heat exchanger 2 and is suitable for collecting the condensed water formed by the heat exchange condensation of the high-temperature and high-pressure gas.

[0045] The condensate pump 15 is connected to the steam compressor 1 and the condensate tank 13 and is suitable for pumping the condensate into the steam compressor 1 to cool the steam compressor 1 with the condensate. It should be noted that pumping the condensate into the steam compressor 1 does not mean pumping it into the compression chamber of the steam compressor 1, but into the cooling water channel of the steam compressor 1. Since a large amount of heat energy will be generated when the steam compressor 1 compresses air, in this embodiment, the steam compressor 1 is provided with a cooling water channel. The condensate enters the cooling water channel of the steam compressor 1 and can quickly cool the steam compressor 1. At the same time, the condensate absorbs the heat energy of the steam compressor 1 and heats up.

[0046] The cold water tank 16 is connected to the steam compressor 1 and is adapted to collect the condensed water discharged by the steam compressor 1. That is, after the condensed water absorbs heat and increases in temperature in the cooling water channel of the steam compressor 1, it is discharged into the cold water tank 16.

[0047] The heat pump system includes an evaporator 3 and a condenser 6. Among them, the evaporator 3 is connected to the cold water tank 16 through a circulation pipeline. The evaporator 3 is adapted to exchange heat with the water in the cold water tank 16. The evaporator 3 can absorb and utilize the water heat energy in the cold water tank 16, enabling the evaporator 3 to absorb heat quickly. Moreover, the condenser 6 of the heat pump system is connected to a second pipeline, and the condenser 6 is adapted to exchange heat with the water in the second pipeline to heat the water in the second pipeline.

[0048] With such a setting, the working process of the vacuum drying system provided in this embodiment is as described below:

[0049] Turn on the heater 9 in the hot water tank 8, heat the water in the hot water tank 8 through the heater 9, and after the water temperature reaches the preset temperature, input it into the heat conduction component 11 in the dryer 7 through the first pipeline. Among them, materials are stored in the dryer 7, and the heat conduction component 11 heats the materials in a heat conduction manner. The water discharged from the heat conduction component 11 flows back to the hot water tank 8 through the second pipeline.

[0050] After the heat conduction component 11 heats the materials, the humidity of the air inside the dryer 7 increases. At this time, turn on the steam compressor 1. The steam compressor 1 inhales the humid air inside the dryer 7, creates a vacuum environment inside the dryer 7, and compresses and increases the enthalpy of the humid air into a high-temperature and high-pressure gas through the steam compressor 1. The high-temperature and high-pressure gas enters the first heat exchanger 2. The first heat exchanger 2 can enable the high-temperature and high-pressure gas to exchange heat with the water in the second pipeline. In this way, the high-temperature and high-pressure gas can heat the water in the second pipeline. When the water in the second pipeline returns to the hot water tank 8, it has a higher temperature, which can reduce the energy consumption of the heater 9.

[0051] When the high-temperature and high-pressure gas exchanges heat in the first heat exchanger 2, it can condense to form condensed water, and the condensed water is collected in the condensed water tank 13. A condensate pump 15 is provided between the condensed water tank 13 and the steam compressor 1, and the condensed water in the condensed water tank 13 is pumped into the steam compressor 1 through the condensate pump 15. Since heat is generated during the operation of the steam compressor 1, when the condensed water in the condensed water tank 13 enters the steam compressor 1, on the one hand, it can cool the steam compressor 1, and on the other hand, it can utilize the heat energy generated by the operation of the steam compressor 1 to increase the temperature of the condensed water. After the condensed water exchanges heat through the steam compressor 1, it enters the cold water tank 16.

[0052] The evaporator 3 of the heat pump system is connected to the cold water tank 16 through a circulation pipeline. The water in the cold water tank 16 can exchange heat with the evaporator 3, so that the evaporator 3 can make full use of the heat energy contained in the water in the cold water tank 16. At the same time, the condenser 6 of the heat pump system is connected to the second pipeline, and the condenser 6 exchanges heat with the water in the second pipeline, thereby heating the water in the second pipeline. After the water in the second pipeline is heated, it returns to the hot water tank 8.

[0053] Therefore, the drying system provided by the embodiment of the present invention can make full use of the heat energy contained in the water vapor generated in the dryer 7 and the heat energy generated by the operation of the steam compressor 1, thereby reducing the energy consumption of the heater 9 and realizing the low-energy consumption and low-carbon operation of the system.

[0054] In a further embodiment, the vacuum drying system further includes a vacuum pump 12, which is respectively connected to the condensate water tank 13 and the cold water tank 16. The vacuum pump 12 is adapted to pump the water in the condensate water tank 13 into the cold water tank 16. It should be noted that since the first heat exchanger 2 is connected to the condensate water tank 13 and the vacuum pump 12 is connected to the condensate water tank 13, under the pressure of the vacuum pump 12, the water flow rate of the first heat exchanger 2 entering the condensate water tank 13 can be controlled.

[0055] In a further embodiment, the vacuum drying system further includes a vent valve 14, and the vent valve 14 is arranged on the condensate water tank 13. With this arrangement, by controlling the vent valve 14 and the vacuum pump 12, the outlet pressure of the first heat exchanger 2 can be controlled, so as to ensure that the high-temperature and high-pressure gas can be fully condensed after passing through the first heat exchanger 2.

[0056] In a further embodiment, the water inlet and outlet of the vacuum pump 12 are respectively connected to the cold water tank 16 to form a closed-circuit pipeline. With this arrangement, the heat energy generated by the operation of the vacuum pump 12 can also be collected into the cold water tank 16 through the closed-circuit pipeline and be exchanged and utilized by the evaporator 3 of the heat pump system, thereby effectively utilizing the heat energy generated when the vacuum pump 12 works and further reducing the system energy consumption.

[0057] In some embodiments, a hot water pump 10 is arranged on the first pipeline, and the hot water pump 10 is adapted to pump the water in the hot water tank 8 into the flow channel of the heat conducting component 11. A cold water pump 17 is arranged on the circulation pipeline connecting the evaporator 3 and the cold water tank 16.

[0058] In some embodiments, the first heat exchanger 2 is arranged as a plate heat exchanger. Of course, in other embodiments, the first heat exchanger 2 can also be arranged as other types of heat exchangers, such as finned heat exchangers, etc.

[0059] In some embodiments, the heat pump system further includes a compressor 4 and a throttle valve 5. The compressor 4 is connected to the evaporator 3 and the condenser 6 respectively through a first refrigerant pipe, and the throttle valve 5 is connected to the evaporator 3 and the condenser 6 respectively through a second refrigerant pipe. The working process of the heat pump system can refer to the heat pump system in the prior art, which will not be elaborated here. It should be noted that the evaporator 3 and the condenser 6 of the heat pump system participate in the above heat exchange, thereby effectively reducing the energy consumption of the heat pump system. Moreover, the heat energy generated by the heat pump system is exchanged to the hot water tank 8 through the condenser 6, which can effectively reduce the energy consumption of the heater 9 in the hot water tank 8.

[0060] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. However, such modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A vacuum drying system, characterized in that, it includes: A dryer (7) with a heat conduction component (11) arranged inside, and the heat conduction component (11) is provided with a flow channel for hot water to flow through; A hot water tank (8) provided with a heater (9), the heater (9) is adapted to heat the water in the hot water tank (8), the water outlet of the hot water tank (8) is communicated with the heat conduction component (11) through a first pipeline, and the water return port of the hot water tank (8) is communicated with the heat conduction component (11) through a second pipeline to form a circulating water path; A steam compressor (1) connected to the dryer (7), the steam compressor (1) is adapted to compress the gas discharged from the dryer (7) to form a high-temperature and high-pressure gas; A first heat exchanger (2) communicated with the exhaust port of the steam compressor (1) and connected to the second pipeline, the first heat exchanger (2) is adapted to exchange heat between the high-temperature and high-pressure gas and the water in the second pipeline; A condensate water tank (13) connected to the first heat exchanger (2), adapted to collect the condensate water formed by the heat exchange condensation of the high-temperature and high-pressure gas; A condensate water pump (15) connected to the steam compressor (1) and the condensate water tank (13), adapted to pump the condensate water into the steam compressor (1) to cool the steam compressor (1) with the condensate water; A cold water tank (16) connected to the steam compressor (1), adapted to collect the condensate water discharged from the steam compressor (1); A heat pump system including an evaporator (3) and a condenser (6), wherein the evaporator (3) is connected to the cold water tank (16) through a circulating pipeline, the evaporator (3) is adapted to exchange heat with the water in the cold water tank (16), the condenser (6) is connected to the second pipeline, and the condenser (6) is adapted to exchange heat with the water in the second pipeline to heat the water in the second pipeline.

2. The vacuum drying system according to claim 1, characterized in that, it further includes: A vacuum pump (12) respectively connected to the condensate water tank (13) and the cold water tank (16).

3. The vacuum drying system according to claim 2, characterized in that, it further includes: A vent valve (14) arranged on the condensate water tank (13).

4. The vacuum drying system according to claim 3, characterized in that, The water inlet and water outlet of the vacuum pump (12) are respectively connected to the cold water tank (16) to form a closed circulating pipeline.

5. The vacuum drying system according to claim 1, characterized in that, A hot water pump (10) is arranged on the first pipeline, and the hot water pump (10) is adapted to pump the water in the hot water tank (8) into the flow channel of the heat conduction component (11).

6. The vacuum drying system according to claim 1, characterized in that, A cold water pump (17) is arranged on the circulating pipeline connecting the evaporator (3) and the cold water tank (16).

7. The vacuum drying system according to claim 1, characterized in that, The first heat exchanger (2) is arranged as a plate heat exchanger.

8. The vacuum drying system according to claim 1, characterized in that, the heat pump system further includes a compressor (4) and a throttle valve (5), the compressor (4) is respectively connected to the evaporator (3) and the condenser (6) through a first refrigerant pipe, and the throttle valve (5) is respectively connected to the evaporator (3) and the condenser (6) through a second refrigerant pipe.

9. The vacuum drying system according to claim 1, characterized in that, the heater (9) is provided as an electric heater.

10. The vacuum drying system according to claim 1, characterized in that, the dryer (7) includes a housing, the housing has airtightness, the internal cavity of the housing is used for placing materials, and the heat conducting component (11) is arranged inside the housing.

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