Crop drying system combining photo-thermal and air source heat pump

Abstract

The utility model relates to a crop drying system combining photo-thermal and an air source heat pump. The crop drying system comprises a drying oven, the air source heat pump, a solar heat collector, a circulating fan and a hot air circulating pipeline. The drying oven is provided with a containing cavity for containing crops. The air source heat pump is connected with the drying oven and provides heat energy into the drying oven; the circulating fan is arranged at the top of the drying oven, and the circulating fan is communicated with the accommodating cavity of the drying oven; one end of the hot air circulating pipeline is connected with the circulating fan, and the other end of the hot air circulating pipeline is connected with the drying oven after passing through the solar heat collector. According to the crop drying system, the solar heat collector and the air source heat pump cooperate to provide heat for the drying oven, energy consumption is reduced, and meanwhile the operation cost of the crop drying system is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of crop drying systems, and in particular to a crop drying system combining photothermal and air source heat pumps. Background Art

[0002] After the crops are harvested, some of them need to be dried to obtain new products or to preserve them for a longer time. In the prior art, people spread the crops on the racks in the oven and use fossil fuels, electricity and other energy sources to heat the air in the oven, thereby accelerating the evaporation of water in the crops to complete the drying of the crops.

[0003] However, a lot of energy is consumed in the process of crop drying. With the development of economic construction and people's emphasis on energy conservation, how to save energy consumption in the process of crop drying has become an important issue in the crop drying system that combines solar thermal energy with air source heat pumps. Utility Model Content

[0004] In order to save energy consumption during crop drying, the present application provides a crop drying system that combines photothermal and air source heat pumps.

[0005] The present application provides a crop drying system combining photothermal and air source heat pump, which adopts the following technical solutions:

[0006] A crop drying system combining photothermal energy and an air source heat pump, comprising an oven, an air source heat pump, a solar thermal collector, a circulating fan and a hot air circulation duct; the oven is provided with a accommodating chamber for accommodating crops; the air source heat pump is connected to the oven, and the air source heat pump provides heat energy to the oven; the circulating fan is arranged on the top of the oven, and the circulating fan is communicated with the accommodating chamber of the oven; one end of the hot air circulation duct is connected to the circulating fan, and the other end of the hot air circulation duct is connected to the oven after passing through the solar thermal collector.

[0007] By adopting the above technical solution, in areas with peak and valley electricity prices, during the day, the solar collector provides heat to the oven mainly, and the air source heat pump provides heat to the oven as a supplement, thereby heating the air in the oven; at night, the air source heat pump provides heat to the oven to continue to heat the air inside the oven. That is, through the synergy of solar collectors and air source heat pumps, not only energy consumption is reduced, but also the operating cost of the crop drying system is reduced.

[0008] At the same time, through the hot air circulation device composed of a circulation fan and a hot air circulation duct, the heat energy in the air can be reused, reducing the heat waste caused by direct discharge of dry air.

[0009] Optionally, it also includes a water vapor separator, which is connected to the hot air circulation duct and is used to separate the water vapor in the hot air circulation duct; the water vapor separator is provided with an automatic drain component for discharging condensed water vapor.

[0010] By adopting the above technical solution, the water vapor in the air is separated by using a water vapor separator, thereby reducing the moisture content of the hot air circulation duct and the air in the drying oven, thereby improving the drying efficiency of crops.

[0011] Optionally, a heat absorption branch is provided at the heat absorption end of the air source heat pump, and the heat absorption branch is laid in the water vapor separator, and the heat absorption branch is used to absorb the heat of the water vapor separator.

[0012] By adopting the above technical solution, the heat absorption branch can absorb the heat in the water vapor separator, thereby improving the heat absorption efficiency of the air source heat pump and reducing the power consumption of the air source heat pump.

[0013] Optionally, a heat dissipation straight path is provided at the heat release end of the air source heat pump, and the heat dissipation straight path is laid in the oven; the heat dissipation straight path is used to release heat into the oven.

[0014] By adopting the above technical solution, the heat dissipation path of the heat absorption end of the air source heat pump is directly laid in the oven, which reduces the heat exchange link compared with the traditional air source heat pump, increases the working efficiency of the air source heat pump, and improves the temperature of the air in the oven.

[0015] Optionally, it also includes an exhaust duct and an exhaust valve, the exhaust duct is connected to the oven, the exhaust valve is arranged on the exhaust duct, and the exhaust valve is used to control the opening and closing of the exhaust duct; the hot air circulation duct is provided with a fresh air intake valve, the fresh air intake valve is externally connected to air supply equipment, and the fresh air intake valve is arranged between the water vapor separator and the solar collector.

[0016] By adopting the above technical solution, the air containing more moisture in the drying oven is discharged from the exhaust duct, thereby reducing the water vapor in the crop drying system and improving the drying effect of the crop drying system.

[0017] Optionally, the solar collector includes a bracket, and a first hollow connecting tube, a second connecting tube and a plurality of heat absorbing parts arranged on the bracket, the heat absorbing part is arranged between the first connecting tube and the second connecting tube, and the heat absorbing part is used to absorb solar energy; the first connecting tube and the second connecting tube are both connected to the hot air circulation pipe, and the gas flows along the hot air circulation pipe, the first connecting tube, the heat absorbing part, the second connecting tube and the hot air circulation pipe in sequence.

[0018] By adopting the above technical solution, a plurality of heat absorbing components are arranged between the first connecting pipe and the second connecting pipe, thereby improving the heat absorption efficiency of the solar thermal collector.

[0019] Optionally, the heat absorbing element is an all-glass vacuum solar collector tube.

[0020] By adopting the above technical solution, the all-glass vacuum solar collector tube has the characteristics of good thermal insulation effect and high working temperature, thereby improving the working efficiency of the solar collector.

[0021] Optionally, the hot air circulation duct includes a main pipe, a first branch pipe, a second branch pipe and a flow control valve; one end of the main pipe is connected to the circulation fan, and the other end of the main pipe is connected to the oven; one end of the first branch pipe is connected to the main pipe, the other end of the first branch is connected to the first connecting pipe, one end of the second branch pipe is connected to the main pipe, and the second branch pipe is connected to the second connecting pipe; the flow control valve is arranged on the main pipe, and the flow control valve is arranged between the first branch pipe and the second branch pipe.

[0022] By adopting the above technical solution, during the day, the flow control valves on the first branch pipeline and the second branch pipeline are closed, so that the air in the crop drying system flows through the main pipe, the solar collector and the main pipe in sequence, and the solar collector can heat the air in the system, thereby reducing the energy consumption in the crop drying system. At night, the flow control valves on the first branch pipeline and the second branch pipeline are opened, so that the air in the system flows along the main pipe and the oven, reducing the heat dissipation effect of the solar collector on the air in the system, and further reducing energy consumption.

[0023] In summary, the present application includes at least one of the following beneficial technical effects:

[0024] 1. The synergy between solar collectors and air source heat pumps not only reduces energy consumption, but also reduces the operating cost of the crop drying system;

[0025] 2. Use a water vapor separator to separate the water vapor in the air and discharge the condensed water in time; thereby reducing the moisture in the hot air circulation pipeline and the air in the oven, and improving the drying efficiency of crops;

[0026] 3. The heat dissipation path of the heat absorption end of the air source heat pump is directly laid in the oven, which reduces the heat exchange link compared with the traditional air source heat pump, increases the working efficiency of the air source heat pump, and improves the temperature of the air in the oven. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the structure of the crop drying system in Example 1.

[0028] Figure 2 It is a schematic diagram of the structure of the crop drying system in Example 2.

[0029] Explanation of the reference numerals: 1. oven; 11. first humidity sensor; 12. first temperature sensor; 2. air source heat pump; 21. heat absorption branch; 22. heat dissipation straight circuit; 3. solar collector; 31. heat absorption element; 32. bracket; 33. first connecting pipe; 34. second connecting pipe; 35. second temperature sensor; 4. water vapor separator; 41. automatic drainage element; 5. hot air circulation duct; 51. main pipe; 52. first branch duct; 53. second branch duct; 54. fresh air intake valve; 55. second humidity sensor; 6. circulation fan; 7. exhaust duct; 8. exhaust valve; 9. flow control valve. DETAILED DESCRIPTION

[0030] The following is combined with Figure 1-2 This application is described in further detail.

[0031] The embodiment of the present application discloses a crop drying system combining photothermal energy with an air source heat pump.

[0032] Reference Figure 1 The crop drying system combining photothermal energy with an air source heat pump 2 comprises a drying oven 1, an air source heat pump 2, a solar collector 3, a circulating fan 6, a water vapor separator 4 and a hot air circulation pipeline 5.

[0033] The oven 1 is provided with a holding chamber for holding crops, and a first humidity sensor 11 and a first temperature sensor 12 are provided on the top of the oven 1, and both the first humidity sensor 11 and the first temperature sensor 12 are connected to a back-end terminal computer. The first humidity sensor 11 is used to monitor the humidity in the oven 1, and the first temperature sensor 12 is used to monitor the temperature in the oven 1.

[0034] The air source heat pump 2 is connected to the oven 1, and the air source heat pump 2 provides heat energy to the oven 1. The circulating fan 6 is arranged on the top of the oven 1, and the circulating fan 6 is connected to the accommodating cavity of the oven 1; one end of the hot air circulation pipeline 5 is connected to the circulating fan 6, and the other end of the hot air circulation pipeline 5 is connected to the oven 1 after passing through the solar collector 3, and the solar collector 3 is also used to transport heat to the oven 1. The crop drying system increases the temperature of the air in the oven 1, so as to use the high temperature air in the oven 1 to dry the farmer's crops.

[0035] In areas where peak and valley electricity prices are implemented; during the day, the solar collector 3 mainly provides heat to the oven 1, and the air source heat pump 2 provides heat to the oven 1 as a supplement, thereby heating the air in the oven 1; at night, the air source heat pump 2 provides heat to the oven 1 to continue to heat the air inside the oven 1. That is, through the coordinated cooperation of the solar collector 3 and the air source heat pump 2, not only the energy consumption is reduced, but also the operating cost of the crop drying system is reduced.

[0036] At the same time, through the hot air circulation device composed of the circulation fan 6 and the hot air circulation duct 5, the heat energy in the air can be reused, reducing the heat waste caused by the direct discharge of dry air.

[0037] The solar collector 3 includes a bracket 32, and a hollow first connecting pipe 33, a second connecting pipe 34 and a plurality of heat absorbing members 31 arranged on the bracket 32. The heat absorbing member 31 is arranged between the first connecting pipe 33 and the second connecting pipe 34, and is used to absorb solar energy; the first connecting pipe 33 and the second connecting pipe 34 are both connected to the hot air circulation pipe 5, and the gas flows along the hot air circulation pipe 5, the first connecting pipe 33, the heat absorbing member 31, the second connecting pipe 34 and the hot air circulation pipe 5 in sequence. In this embodiment, the heat absorbing member 31 is an all-glass vacuum solar heat collecting tube. Compared with ordinary flat-plate modules, the all-glass vacuum solar heat collecting tube has the characteristics of good heat preservation effect and high working temperature, thereby improving the working efficiency of the solar collector 3. A second temperature sensor 35 is arranged on the solar collector 3, and the second temperature sensor 35 is connected to the back-end terminal computer, and the second temperature sensor 35 is used to monitor the temperature in the solar collector 3.

[0038] The hot air circulation duct 5 includes a main pipe 51, a first branch pipe 52, a second branch pipe 53 and a flow control valve 9. One end of the main pipe 51 is connected to the circulation fan 6, and the other end of the main pipe 51 is connected to the oven 1; one end of the first branch pipe 52 is connected to the main pipe 51, and the other end of the first branch is connected to the first connecting pipe 33; one end of the second branch pipe 53 is connected to the main pipe 51, one end of the second branch pipe 53 is connected to the main pipe 51, and the second branch pipe 53 is connected to the second connecting pipe 34. The flow control valve 9 is arranged on the main pipe 51, and the flow control valve 9 is arranged between the first branch pipe 52 and the second branch pipe 53. In this embodiment, the hot air circulation duct 5 is made of 304 high temperature resistant stainless steel pipe. A second humidity sensor 55 is provided on the main pipe 51 . The second humidity sensor 55 is arranged between the circulating fan 6 and the water vapor separator 4 . The second humidity sensor 55 is connected to the back-end terminal computer. The second humidity sensor 55 is used to monitor the humidity in the main pipe 51 .

[0039] The principle of cooperation between the hot air circulation pipe 5 and the flow control valve 9 is:

[0040] During the day, the temperature in the solar collector 3 is higher than the temperature in the oven 1, and the heat in the oven 1 is mainly increased by the solar collector 3. The flow control valves 9 on the first branch pipe 52 and the second branch pipe 53 are closed, so that the air in the crop drying system flows through the main pipe 51, the solar collector 3 and the main pipe 51 in sequence. The solar collector 3 can heat the air in the system, thereby reducing the energy consumption in the crop drying system. At night, the flow control valves 9 on the first branch pipe 52 and the second branch pipe 53 are opened, so that the air in the system flows along the main pipe 51 and the oven 1, reducing the heat dissipation effect of the solar collector 3 on the air in the system, and further reducing energy consumption.

[0041] The water vapor separator 4 is connected to the main pipe 51, and the water vapor separator 4 is arranged between the circulating fan 6 and the solar collector 3. The water vapor separator 4 is used to separate the water vapor in the main pipe 51. The water vapor separator 4 is provided with an automatic drainage component 41 for discharging the condensed water vapor. The water vapor separator 4 is used to separate the water vapor in the air, and the condensed water is discharged in time; thereby reducing the moisture in the hot air circulation duct 5 and the air in the oven 1, and improving the drying efficiency of crops. The output power of the water vapor separator 4 can be adjusted by the humidity in the main pipe 51 and the humidity in the oven 1. The water vapor separator 4 is a prior art, and the specific structure of the water vapor separator 4 is not described in detail in this embodiment.

[0042] The air source heat pump 2 is a prior art, so it will not be repeated in this embodiment.

[0043] The heat absorbing end of the air source heat pump 2 is provided with a heat absorbing branch 21, that is, the evaporator of the air source heat pump 2 is connected to the heat absorbing branch 21. The heat absorbing branch 21 is laid in the water vapor separator 4, and the heat absorbing branch 21 is used to absorb the heat of the water vapor separator 4. The heat releasing end of the air source heat pump 2 is provided with a heat dissipation straight path 22, that is, the condenser of the air source heat pump 2 is connected to the heat dissipation bracket 32, and the heat dissipation straight path 22 is laid in the oven 1. The heat dissipation straight path 22 is a refrigerant circulation, and the heat dissipation straight path 22 is used to release heat to the oven 1.

[0044] The water vapor separator 4 has a large amount of heat, and the heat absorption branch 21 can absorb the heat in the water vapor separator 4, thereby improving the heat absorption efficiency of the air source heat pump 2 and reducing the power consumption of the air source heat pump 2. At the same time, the heat absorption branch 21 can cool the water vapor separator 4, so that the water vapor separator 4 no longer needs to use cooling equipment, further saving energy. The heat dissipation straight path 22 of the heat absorption end of the air source heat pump 2 is directly laid in the oven 1, which reduces the heat exchange link compared with the traditional air source heat pump 2, increases the working efficiency of the air source heat pump 2, and improves the temperature of the air in the oven 1.

[0045] Example 2

[0046] The difference between this embodiment 2 and embodiment 1 is that:

[0047] Reference Figure 2 The crop drying system further includes an exhaust pipe 7 and an exhaust valve 8. The exhaust pipe 7 is connected to the oven 1. The exhaust valve 8 is arranged on the exhaust pipe 7. The exhaust valve 8 is used to control the on and off of the exhaust pipe 7. The hot air circulation pipe 5 is provided with a fresh air intake valve 54. The fresh air intake valve 54 is externally connected to an air supply device. The fresh air intake valve 54 is arranged between the water vapor separator 4 and the solar collector 3. When the crops contain more moisture, the fresh air intake valve 54 on the hot air circulation pipe 5 is externally connected to an air supply device, thereby adding new air to the oven 1; at the same time, the air containing more moisture in the oven 1 is discharged from the exhaust pipe 7, thereby reducing the moisture in the crop drying system and improving the drying effect of the crop drying system.

[0048] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A crop drying system combining photothermal and air source heat pump, characterized by: The invention comprises an oven (1), an air source heat pump (2), a solar thermal collector (3), a circulating fan (6) and a hot air circulation duct (5); the oven (1) is provided with a accommodating chamber for accommodating crops; the air source heat pump (2) is connected to the oven (1), and the air source heat pump (2) provides heat energy to the oven (1); the circulating fan (6) is arranged on the top of the oven (1), and the circulating fan (6) is communicated with the accommodating chamber of the oven (1); one end of the hot air circulation duct (5) is connected to the circulating fan (6), and the other end of the hot air circulation duct (5) is connected to the oven (1) after passing through the solar thermal collector (3).

2. The crop drying system combining light heat and air source heat pump according to claim 1 is characterized in that: It also comprises a water vapor separator (4), the water vapor separator (4) being connected to the hot air circulation pipe (5), the water vapor separator (4) being used to separate water vapor in the hot air circulation pipe (5); the water vapor separator (4) is provided with an automatic drainage component (41) for discharging condensed water vapor.

3. The crop drying system combining light heat and air source heat pump according to claim 2 is characterized in that: A heat absorbing branch (21) is provided at the heat absorbing end of the air source heat pump (2); the heat absorbing branch (21) is laid in the water vapor separator (4); and the heat absorbing branch (21) is used to absorb heat from the water vapor separator (4).

4. The crop drying system combining light heat and air source heat pump according to claim 1 is characterized in that: A heat dissipation straight path (22) is provided at the heat release end of the air source heat pump (2), and the heat dissipation straight path (22) is laid in the oven (1); the heat dissipation straight path (22) is used to release heat into the oven (1).

5. The crop drying system combining light heat and air source heat pump according to claim 2 is characterized in that: The invention also comprises an exhaust duct (7) and an exhaust valve (8), wherein the exhaust duct (7) is connected to the oven (1), and the exhaust valve (8) is arranged on the exhaust duct (7), and the exhaust valve (8) is used to control the on-off of the exhaust duct (7); the hot air circulation duct (5) is provided with a fresh air intake valve (54), the fresh air intake valve (54) is externally connected to air supply equipment, and the fresh air intake valve (54) is arranged between the water vapor separator (4) and the solar collector (3).

6. The crop drying system combining light heat and air source heat pump according to claim 1 is characterized in that: The solar thermal collector (3) comprises a bracket (32), and a first hollow connecting pipe (33), a second hollow connecting pipe (34) and a plurality of heat absorbing components (31) arranged on the bracket (32); the heat absorbing component (31) is arranged between the first connecting pipe (33) and the second connecting pipe (34); the heat absorbing component (31) is used to absorb solar energy; the first connecting pipe (33) and the second connecting pipe (34) are both connected to the hot air circulation pipe (5); and gas flows in sequence along the hot air circulation pipe (5), the first connecting pipe (33), the heat absorbing component (31), the second connecting pipe (34) and the hot air circulation pipe (5).

7. The crop drying system combining light heat and air source heat pump according to claim 6 is characterized in that: The heat absorbing element (31) is an all-glass vacuum solar heat collecting tube.

8. The crop drying system combining light heat and air source heat pump according to claim 6 is characterized in that: The hot air circulation duct (5) comprises a main duct (51), a first branch duct (52), a second branch duct (53) and a flow control valve (9); one end of the main duct (51) is connected to the circulation fan (6), and the other end of the main duct (51) is connected to the oven (1); one end of the first branch duct (52) is connected to the main duct (51), the other end of the first branch duct is connected to the first connecting duct (33), one end of the second branch duct (53) is connected to the main duct (51), and the second branch duct (53) is connected to the second connecting duct (34); the flow control valve (9) is arranged on the main duct (51), and the flow control valve (9) is arranged between the first branch duct (52) and the second branch duct (53).

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