Solar high-temperature heat utilization device for grain depot

Abstract

The invention relates to a solar high-temperature heat utilization device for a grain depot, which adopts a solar air heater, heat storage of a heat conducting oil system, adsorption type refrigeration and an improved transverse ventilation technology to realize efficient utilization of solar heat in drying and low-temperature storage of grains in the grain depot. The solar energy grain depot is convenient to install, maintain and maintain, is safe and efficient, and is expected to have remarkable social, economic and ecological benefits.

Description

Technical Field

[0001] The invention relates to the technical field of solar energy thermal utilization, and in particular to a grain depot solar energy high temperature thermal utilization device adopting solar energy hot air device and thermal oil high temperature heat storage technology. Background Art

[0002] Food security is related to national destiny, and grain storage is one of the important links. The drying, ventilation, and low-temperature storage of grain in the grain storage process consume a lot of electricity and heat energy, and energy conservation deserves attention. The storage conditions of the storage unit should support the government's reserve temperature-controlled storage, and have the ability to achieve low-temperature or quasi-low-temperature storage effects, and technically be able to achieve safe storage for another year on the basis of the normal storage period.

[0003] At present, the dominant type of warehouse for grain storage in China is the flat warehouse, which accounts for about 80% of the total storage capacity of grain depots in China. The span of the flat warehouse is generally 18 meters, 21 meters, 24 meters, 27 meters, 30 meters, 33 meters, and 36 meters, and the length is generally 40 meters to 100 meters. The height of the flat warehouse is generally 7 to 8 meters, and the storage capacity of a single flat warehouse is preferably 1,000 tons to 8,000 tons. The roof area of ​​the flat warehouse is considerable, which is suitable for the layout of solar thermal utilization or photovoltaic power generation devices.

[0004] As a grain storage warehouse, the large flat warehouse has a large single warehouse capacity, high grain piles, and a long grain storage period. The transfer of temperature, humidity, and moisture and condensation on the grain piles are the biggest hidden dangers to safe grain storage. In this context, the "four-in-one" grain storage technology based on shared air ducts came into being. While using a complete set of horizontal ventilation systems to achieve temperature and humidity monitoring, ventilation and cooling, fumigation and pest control, cooling and temperature control, etc., it also adds multi-parameter detection of grain pile humidity, gas, and nitrogen filling and gas conditioning, inert powder aerosol physical pest control and other process functions. It has been successfully transformed and implemented and achieved good economic, social and ecological benefits. However, the existing horizontal ventilation system technology still has great room for optimization.

[0005] Solar thermal applications include solar water heating, solar heating, solar cooling, solar industrial and agricultural applications, and photovoltaic / thermal integration (PV / T) applications.

[0006] Solar water heating system: In 2009, there were more than 3,000 solar water heating system enterprises in China, with an annual output of about 40 million square meters and a total stock of 145 million square meters, accounting for 78% and 54% of the world respectively. Hot water is mainly produced by solar collectors, and the hot water produced is basically below 100°C. If the hot water temperature is 150-200°C, the water in this temperature range must maintain a pressure of 0.5-1.6MPa if it does not boil and vaporize, and it needs to be equipped with containers and pipeline valves with higher pressure. Steam may also flash out during use, which is not convenient for actual use. The hot water produced by the solar water heating system cannot be used in a timely and complete manner, which is easy to cause waste. In addition, the scaling and leakage problems of the solar water heating system are its inherent problems.

[0007] Photovoltaic system: The efficiency of photovoltaic power generation is relatively low, because photovoltaic panels mainly absorb visible light and infrared rays in solar radiation, and have a relatively weak absorption capacity for ultraviolet and blue light. In actual applications, the conversion efficiency of crystalline silicon photovoltaic cells is only 13% to 26%. Photovoltaic power generation technology requires silicon crystal materials, and the main raw material of crystalline silicon cells is pure silicon. Its production and purification process requires multiple chemical and physical processes, which not only consumes a lot of energy, but also causes certain pollution to the environment. Moreover, photovoltaic power is an unstable power source with limited access to the Internet, and must be equipped with energy storage devices.

[0008] my country is the largest producer and user of solar water heating systems and a major photovoltaic application country. How to transform from a major solar thermal utilization country to a strong solar thermal utilization country, store the heat obtained in the light-heat conversion process in a cheap, simple and convenient way, eliminate the scaling problem of the existing solar water heating system, combine the adsorption chiller refrigeration technology, use it for grain drying, ventilation and low-temperature storage, and improve the existing horizontal ventilation system on this basis, is worthy of in-depth study. Summary of the invention

[0009] The purpose of the present invention is to solve the problems existing in the application of existing solar water heating systems and photovoltaic systems in grain depots, and to use solar heat heaters and thermal oil heat storage technology to collect, store and supply heat from solar energy, give full play to the characteristics of thermal oil as a "low pressure and high temperature" and high-quality heat storage and heat supply medium, realize the continuous application of solar heat in the grain drying process, use the heat-storing thermal oil to drive the adsorption refrigeration mechanism for cooling, ventilate and store grain at low temperature, and finally realize the long-term and efficient thermal utilization of solar energy in grain drying, ventilation and low-temperature storage in grain depots.

[0010] A grain depot solar high temperature heat utilization device, comprising: Solar thermal air generator 7, recovers heat from solar energy, Drying chamber 6 uses hot gas to dry the grain in the drying chamber 6. The thermal oil tank 1 is used as a heat storage device for heat storage. The thermal oil pump 17 is used to pressurize and transport the thermal oil. The gas coming out of the drying chamber 6 returns to the solar heat generator 7 through the circulation fan 4 and the return air pipeline 5, absorbs solar heat through the heat collecting pipe in the solar heat generator 7, and is then transported to the drying chamber 6; or the gas coming out of the drying chamber 6 returns to the solar heat generator 7 through the return air pipeline 5, absorbs solar heat through the heat collecting pipe in the solar heat generator 7, and is then transported to the drying chamber 6 through the ventilator 13, thereby forming a solar heat recovery and heat release circulation loop for the gas. The heat transfer oil in the heat transfer oil tank 1 is pressurized by the heat transfer oil pump 17 and sent to the heat storage heat exchanger 14 to exchange heat with the hot air sent by the solar hot air device 7. The temperature of the heat transfer oil is increased and returned to the heat transfer oil tank 1 through the heat transfer oil return pipeline, thereby forming a heat storage circulation loop of the heat transfer oil in the heat transfer oil tank 1. The gas coming out of the heat storage heat exchanger 14 returns to the solar heat heater 7 through the circulation fan 4 and the return air pipeline 5, absorbs solar heat through the heat collecting pipes in the solar heat heater 7, and is then transported to the heat storage heat exchanger 14; or the gas coming out of the heat storage heat exchanger 14 returns to the solar heat heater 7 through the return air pipeline 5, absorbs solar heat through the heat collecting pipes in the solar heat heater 7, and is then transported to the heat storage heat exchanger 14 through the ventilator 13, thereby forming another solar heat recovery and heat release circulation loop of the gas.

[0011] At night or on cloudy days, the solar energy recovered by the solar hot air device 7 is not enough to supply the drying chamber 6. The heat transfer oil in the heat transfer oil tank 1 is pressurized by the heat transfer oil pump 17 and sent to the heat storage heat exchanger 14 to exchange heat with the gas sent by the solar hot air device 7. The heat transfer oil with reduced temperature returns to the heat transfer oil tank 1. The gas sent into the solar hot air heater 7 is heated by the heat storage heat exchanger 14 and then sent to the drying chamber 6 to dry the grain. The gas coming out of the drying chamber 6 returns to the solar hot air heater 7 through the circulating fan 4 and the return air pipeline 5, passes through the heat collecting pipe in the solar hot air heater 7, and is then transported to the heat storage heat exchanger 14. Alternatively, the gas sent into the solar hot air heater 7 is heated by the heat storage heat exchanger 14 and then sent to the drying chamber 6 to dry the grain. The gas coming out of the drying chamber 6 returns to the solar hot air heater 7 through the return air pipeline 5, passes through the heat collecting pipe in the solar hot air heater 7, and is then transported to the heat storage heat exchanger 14 through the ventilator 13, thereby forming a heat release circulation loop of the heat storage oil in the heat transfer oil tank 1 and a heat absorption and heat supply circulation loop of the gas.

[0012] The drying chamber 6 can be of various types, and can be a separately arranged drying tower, or the grain can be pre-dehumidified in the drying tower and then transferred to the flat warehouse, and then the wet grain in the flat warehouse can be dried by hot air.

[0013] Dehumidifier 11 is provided: The humid gas coming out of the drying chamber 6 is sent to the solar hot air generator 7 after removing part of the moisture from the grain by the dehumidifier 11, so as to facilitate the removal of moisture from the grain. The dehumidifier 11 uses liquid dehumidification, rotary dehumidification, membrane dehumidification or coupled dehumidification, refrigeration dehumidification and other technologies to adjust the humidity of the dry gas in the drying chamber 6 to a suitable range.

[0014] An adsorption refrigerator is provided, including a first adsorption bed 26, a second adsorption bed 30 and six three-way switching valves S1 to S6. The adsorption refrigerator is used to absorb the heat of the heat transfer oil and realize the refrigeration cycle process of the refrigerant, wherein: Six three-way switching valves S1 to S6, through the opening and closing of the three valve ends corresponding to the six three-way switching valves S1 to S6, the alternating operation of the heating-desorption-condensation and cooling-adsorption-evaporation processes of the first adsorption bed 26 and the second adsorption bed 30 is realized and a continuous refrigeration cycle is realized. S1 corresponds to the three valve ends a, b, c, S2 corresponds to the valve ends d, e, f, S3 corresponds to the valve ends g, h, i, S4 corresponds to the valve ends j, k, l, S5 corresponds to the valve ends m, n, o, S6 corresponds to the valve ends p, q, r (see attached Figure 1 ); as shown in the following table: The first adsorption bed 26 is a heating-desorption-condensation process, and the second adsorption bed 30 is a cooling-adsorption-evaporation process. The four medium circulation processes are as follows: High-temperature heat transfer oil: The high-temperature heat transfer oil coming out of the heat transfer oil tank 1 passes through the heat transfer oil pump 17, pipeline R1, a and b (c is closed) of the No. 1 three-way switching valve S1, and pipeline R2 to enter the No. 1 heating / cooling channel 28 of the No. 1 adsorption bed 26 to heat the adsorbed working medium pair (No. 1 adsorbent 27 and No. 1 refrigerant 29) in the No. 1 adsorption bed 26, and the No. 1 refrigerant 29 is desorbed. The heat transfer oil coming out of the No. 1 heating / cooling channel 28 passes through pipeline R3, k and j (l is closed) of the No. 4 three-way switching valve S4, and pipeline R4 to return to the heat transfer oil tank 1, thereby forming a heating cycle process of the high-temperature heat transfer oil; Refrigerant: The refrigerant No. 1 29 desorbed from the adsorbent No. 1 27 in the adsorbent bed No. 1 26 enters the condenser 34 through the pipeline R15, the i and g (h closed) of the three-way switching valve S3, and the pipeline R19, and exchanges heat with the low-temperature heat transfer oil sent from the valve F11. The refrigerant No. 1 29 is condensed into liquid and enters the liquid storage tank 35 (which may not be set), and then enters the evaporator 36 through the throttle valve F12, and exchanges heat with the cooling medium sent from the cold unit 38, absorbing heat and transferring cold. The evaporated gaseous refrigerant No. 1 29 enters the adsorbent bed No. 2 30 through the pipeline R21, the p and q (r closed) of the six-way switching valve S6, and the pipeline R22, and is adsorbed by the adsorbent No. 2 32 in the adsorbent bed No. 2 30, thereby completing the process of heating-desorption-condensation, evaporative cooling, and adsorption of the refrigerant No. 1 29 in the adsorbent bed No. 1 26, and then in the adsorbent bed No. 2 31. Low-temperature heat transfer oil: The low-temperature heat transfer oil from the low-temperature heat transfer oil pump 44 is sent to the condenser 34 through the pipeline R11, the valve F11, and the pipeline R18 to cool the No. 1 refrigerant 29 sent from the pipeline R19 to condense it into a refrigerant liquid. The heat transfer oil from the condenser 34 enters the cooler 40 through the pipeline R17 for cooling. The cooled low-temperature heat transfer oil enters the oil storage tank 43 and then returns to the low-temperature heat transfer oil pump 44, thus forming a circulation process of the low-temperature heat transfer oil. The low-temperature heat transfer oil from the low-temperature heat transfer oil pump 44 is sent to the condenser 34 through the pipeline R11, the valve F11, and the No. 5 three-way switching valve S5. n (0 closed), pipe R12 is sent into the No. 2 heating / cooling channel 33 in the No. 2 adsorption bed 30, the adsorption working medium pair in the No. 2 adsorption bed 30 is cooled, and the heat generated when the No. 2 adsorbent 31 adsorbs the No. 1 refrigerant 29 is removed. The heat transfer oil coming out of the No. 2 heating / cooling channel 33 in the No. 2 adsorption bed 30 passes through the pipe R5, the e and d (f closed) of the No. 2 three-way switching valve S2, and the pipe R14 to enter the cooler 40 for cooling. The cooled low-temperature heat transfer oil enters the oil storage tank 43 and then returns to the low-temperature heat transfer oil pump 44, thereby forming another circulation process of low-temperature heat transfer oil; Cooling medium: The cooling medium from the cooling unit 38 is sent to the evaporator 36 through the booster 39, absorbs the cooling energy generated by the evaporation of the liquid in the evaporator 36, and is sent to the cooling unit 38 through the cooling medium pipeline 37, thereby forming a circulation loop of the cooling medium; when the cooling medium is air, the booster 39 is a blower; when the cooling medium is liquid, the booster P3 is a liquid circulation pump; When the first adsorption bed 26 is in the cooling-adsorption-evaporation process and the second adsorption bed 30 is in the heating-desorption-condensation process, the four medium circulation processes are as follows: High-temperature heat transfer oil: The high-temperature heat transfer oil coming out of the heat transfer oil tank 1 passes through the heat transfer oil pump 17, the pipeline R1, a and c (b is closed) of the No. 1 three-way switching valve S1, and the pipeline R5 to enter the No. 2 heating / cooling channel 33 of the No. 2 adsorption bed 30 to heat the adsorbed working medium pair (No. 2 adsorbent 31 and No. 2 refrigerant 32) in the No. 2 adsorption bed 30, and the No. 2 refrigerant 32 is desorbed. The heat transfer oil coming out of the No. 2 heating / cooling channel 33 passes through the pipeline R6, l and j (k is closed) of the No. 4 three-way switching valve S4, and the pipeline R4 to return to the heat transfer oil tank 1, thereby forming a heating cycle process of the high-temperature heat transfer oil; Refrigerant: The No. 2 refrigerant 32 desorbed from the No. 2 adsorbent 31 in the No. 2 adsorbent bed 30 enters the condenser 34 through the pipeline R16, the h and g (i is closed) of the No. 3 three-way switching valve S3, and the pipeline R19, and exchanges heat with the low-temperature heat transfer oil sent from the valve F11. The No. 2 refrigerant 32 is condensed into liquid and enters the liquid storage tank 35 (which may not be set), and then enters the evaporator 36 through the throttle valve F12, and exchanges heat with the cold medium sent from the cold unit 38, absorbing heat and transferring cold. The evaporated gaseous No. 2 refrigerant 32 enters the No. 1 adsorbent bed 26 through the pipeline R21, the p and r (o is closed) of the No. 6 three-way switching valve S6, and the pipeline R23, and is adsorbed by the No. 1 adsorbent 27 in the No. 1 adsorbent bed 26, thereby completing the process of heating-desorption-condensation, evaporative cooling, and adsorption of the No. 1 adsorbent 27 in the No. 1 adsorbent bed 26 by the No. 1 adsorbent 27; Low-temperature heat transfer oil: The low-temperature heat transfer oil from the low-temperature heat transfer oil pump 44 is sent to the condenser 34 through the pipeline R11, the valve F11, and the pipeline R18 to cool the No. 2 refrigerant 32 sent from the pipeline R19, so that it is condensed into a refrigerant liquid. The heat transfer oil from the condenser 34 enters the cooler 40 through the pipeline R17 for cooling. The cooled low-temperature heat transfer oil enters the oil storage tank 43 and then returns to the low-temperature heat transfer oil pump 44, thus forming a circulation process of the low-temperature heat transfer oil; the low-temperature heat transfer oil from the low-temperature heat transfer oil pump 44 is sent to the condenser 34 through the pipeline R11, the m and o (n is closed), pipe R13 is sent into the No. 1 heating / cooling channel 28 in the No. 1 adsorption bed 26, the adsorption working medium pair in the No. 1 adsorption bed 26 is cooled, and the heat generated when the No. 1 adsorbent 27 adsorbs the No. 2 refrigerant 32 is removed. The heat transfer oil coming out of the No. 1 heating / cooling channel 28 in the No. 1 adsorption bed 26 passes through the pipe R2, f and d (e is closed) of the No. 2 three-way switching valve S2, and the pipe R14 to enter the cooler 40 for cooling. The cooled low-temperature heat transfer oil enters the oil storage tank 43 and then returns to the low-temperature heat transfer oil pump 44, thereby forming another circulation process of the low-temperature heat transfer oil; Cooling medium: The cooling medium from the cooling unit 38 is sent to the evaporator 36 through the booster 39, absorbs the cooling energy generated by the evaporation of the liquid in the evaporator 36, and is sent to the cooling unit 38 through the cooling medium pipeline 37, thereby forming a circulation loop of the cooling medium; when the cooling medium is air, the booster 39 is a blower; when the cooling medium is liquid, the booster P3 is a liquid circulation pump; The above processes are performed alternately, thereby realizing a continuous cooling process for the cooling unit 38 by the adsorption refrigerator with dual adsorption beds operating in parallel.

[0015] The first adsorption bed 26, the second adsorption bed 30, and the corresponding adsorbents, refrigerants, and heating / cooling channels are essentially the same and are distinguished by their names for the convenience of description.

[0016] The cooler 40 is cooled by water or air, for example, the cooling water is river water, river water or sea water, etc. The cooling water 41 enters the cooler 40, and the generated high-temperature cooling water 42 is discharged; When the cooler 40 adopts a closed cooling tower, a conventional closed cooling tower cooling cycle process is adopted.

[0017] The adsorbent pairs in the first adsorption bed 26 and the second adsorption bed 30 include, but are not limited to, activated carbon-methanol, zeolite-water, silica gel-water, calcium chloride-ammonia, strontium chloride-ammonia, activated carbon-ethanol, etc., wherein the adsorbents are mostly composite adsorbent porous solid particles formed by compounding with a binder in practical applications. In practical applications, it is necessary to select a suitable adsorption pair according to the temperature of the heat transfer oil, and select a suitable refrigeration cycle mode according to actual requirements.

[0018] A heat exchanger 18 is provided: The heat transfer oil in the heat transfer oil tank 1 enters the heat transfer oil pump 17 to increase the pressure, and the pressurized heat transfer oil is transported to the heat exchanger 18 to heat the heated working medium 19 into the heat supply medium 20, and the heat transfer oil coming out of the heat exchanger 18 returns to the heat transfer oil tank 1, thereby forming a heat supply circulation loop of the heat transfer oil in the heat transfer oil tank 1. For example, the heat exchanger 18 is used as an organic working medium evaporator of the organic Rankine cycle unit. At this time, the heat transfer oil passing through the heat exchanger 18 is the heat source of the organic working medium evaporator, which is used to heat and vaporize the liquid organic working medium transported by the organic working medium circulation pump to generate high-temperature gaseous organic working medium, enter the organic working medium gas turbine to drive the organic working medium generator to generate electricity, and the low-temperature and low-pressure organic working medium vapor coming out of the organic working medium gas turbine enters the organic working medium condenser to be liquefied, and then returns to the organic working medium circulation pump, thereby forming an organic working medium Rankine cycle loop.

[0019] The heat collecting pipe of the solar thermal air heater 7 includes but is not limited to a through heat collecting pipe 10, a heat pipe 72 or a single-pass heat collecting pipe.

[0020] When the solar thermal air heater 7 uses a through heat collecting pipe 10, the through heat collecting pipe 10 can be connected in series, in parallel or in series and in parallel: For example, Figure 1 As shown, a plurality of through heat collecting tubes 10 are used in parallel, and two groups of solar hot air heaters 7 (double header hot air heaters) are used in series. The solar hot air heater 7 comprises a left header 8, a right header 9, and a through heat collecting tube 10. A plurality of through heat collecting tubes 10 connected in parallel are arranged between the left header 8 and the right header 9. The through heat collecting tubes 10 absorb the heat of solar energy and heat the gas entering the right header 9. The generated high-temperature gas is drawn out from the left header 8, transported to the drying chamber 11 for drying the Panax notoginseng, and then returned to the right header 9, thereby forming a closed-loop gas circulation loop of the through heat collecting tube type solar hot air heater 7; the outlet hot air of one group of solar hot air heaters 7 is used in series as the inlet gas of another group of solar hot air heaters; For example, Figure 1 As shown, multiple through-collecting tubes 10 are used in series and two groups of solar hot air heaters 7 (trough-type hot air heaters) are used in series. The solar hot air heater 7 includes a trough-type collector 45, a concentrating plate 46 and a through-collecting tube 10. Gas enters the multiple through-collecting tubes 10 connected in series. The through-collecting tubes 10 absorb the heat of the solar energy and heat the incoming gas. The generated high-temperature gas is drawn out and used in series as the incoming gas of another group of solar hot air heaters.

[0021] Preferably, the through-tube heat collecting tube 10 adopts a vacuum collector, the inner layer of the heat collecting tube is a stainless steel tube, the outer layer is a glass tube plus metal bellows at both ends, and the outer surface of the inner tube is coated with a selective absorption coating to achieve maximum absorption rate of direct solar radiation and minimum infrared wave re-radiation.

[0022] When the solar heat air device 7 adopts a heat pipe type heat collecting tube, as shown in the attached Figure 2 As shown, the outer surface of the heat pipe 72 in the vacuum glass tube 71 is coated with a selective absorption coating, which is the evaporation part of the heat pipe 72. The part of the heat pipe 72 extending into the manifold 74 is the condensation part of the heat pipe 72, which absorbs the heat of the solar energy and is used to heat the gas 75 entering the manifold.

[0023] When the solar heat air device 7 adopts a single-pass heat collecting tube, as shown in the attached Figure 3 As shown, the single-pass heat collecting tube adopts a vacuum glass tube type, the inner tube 81 of the single-pass heat collecting tube, the air intake main pipe 80 and the air intake branch pipe 81 are preferably made of stainless steel, and the outer surface of the inner tube 78 of the single-pass heat collecting tube is coated with a selective absorption coating. The air intake 75 of the solar heat heater 7 enters the air intake main pipe 80, enters the bottom of the inner tube 81 of the single-pass heat collecting tube through the air intake branch pipe 81, and flows into the inner tube 81 of the single-pass heat collecting tube to absorb the heat of the solar energy. The generated hot gas enters the header 74 to form the hot air outlet 76 of the solar heat heater 7.

[0024] A supplementary heat device 21 is provided: the supplementary heat device 21 is arranged between the solar hot air device 7 and the heat storage heat exchanger 14, and adopts electric heating, compressed air heat, fuel combustion heat, etc. to supplement the heat required by the drying chamber 6 and the heat transfer oil tank 1. For example, the supplementary heat medium 22 adopts hot air formed by the combustion of natural gas, enters the supplementary heat device 21 to heat the air sent by the solar hot air device 7, and the low-temperature flue gas formed is discharged by discharging the supplementary heat medium 23.

[0025] The circulating fan 4 is provided with an adjusting damper 3 for adjusting the air supply volume of the circulating fan 4 .

[0026] The ventilator 13 is provided with a hot air regulating damper 12 for adjusting the air supply volume of the ventilator 13 .

[0027] The circulating fan 4 and the ventilator 13 are substantially the same, and the names are only used to distinguish them.

[0028] The circulating fan 4 or the ventilator 13 is a centrifugal, axial flow, screw or vortex fan.

[0029] The solar heat generator 7 is provided with necessary support rods or support frames to securely, stably and effectively fix the solar heat generator to avoid tipping accidents caused by strong winds.

[0030] The inlet pipeline of the thermal oil pump 17 is provided with a filter for filtering solid impurity particles in the thermal oil in the inlet pipeline.

[0031] The heat transfer oil tank 1 in the heat transfer oil system plays the role of oil and gas separation, buffering, heat storage and storage, and insulation measures need to be taken.

[0032] The heat transfer oil system is provided with necessary exhaust valves and safety valves.

[0033] The thermal oil tank 1 adopts a horizontal or vertical structure, preferably a vertical structure, which facilitates the compact arrangement of the system.

[0034] The valve names in this application are only used for distinction, and some of the actual functions are the same.

[0035] The circulating fan 4 or the ventilator 13 adopts a variable frequency speed regulation operation mode, and flexibly adjusts the air supply volume and air supply pressure when the sunshine and heating conditions change.

[0036] The absorption refrigerator of this system can adopt measures such as cooling back, quality return and distillation.

[0037] Based on "CN200910085093.1- Grain Silo Transverse Ventilation Method and System", this application proposes an improved solution for the transverse ventilation system in combination with the above technical solution, as shown in the attached Figure 4 , Attachment Figure 5 shown.

[0038] As attached Figure 4 , using the method of air intake through the gables on both sides and air outlet in the middle of the grain pile: The bulk grain pile 90 is covered with a closed film 87, an air outlet pipe 88 is arranged in the middle of the granary 90, and an air inlet main pipe 85 and an air inlet branch pipe 86 are arranged on the gables 84 on both sides of the granary 90. The air outlet pipe wall 93 of the air outlet pipe 88 is opened for introducing circulating gas. The air outlet pipe 88 adopts a structure that is easy to disassemble and move, which is convenient for the grain machinery in the granary 90 to enter and exit. When the cold medium of the cold unit 27 is liquid, the cold amount of the cold medium in the cold unit 27 is transferred to the circulating gas 94, and the circulating gas is sent to the bulk grain pile 89 through the air inlet main pipe 85 and the air inlet branch pipe 86, and then returns to the cold unit 27 through the air outlet pipe 88 and the circulating gas pipeline 94. The No. 1 circulating fan 91 and the No. 2 circulating fan 92 provide gas circulation power, thereby realizing low-temperature ventilation grain storage. When the cold medium of the cold unit 27 is gas, it is the circulating gas of low-temperature ventilation grain storage. The hot air delivered by the solar heat heater 7 is sent into the bulk grain pile 89 through the air intake main pipe 85 and the air intake branch pipe 86, and then returns to the solar heat heater 7 through the air outlet pipe 88 and the circulating gas pipeline 94. The No. 1 circulating fan 91 and the No. 2 circulating fan 92 provide gas circulation power, thereby realizing the hot air drying process of the bulk grain pile 89 in the granary 90.

[0039] As attached Figure 5 , using the method of air outlet on both sides of the gable and air intake in the middle of the grain pile: The bulk grain pile 90 is covered with a closed film 87, an air inlet pipe 881 is arranged in the middle of the granary 90, and an air outlet main pipe 851 and an air outlet branch pipe 861 are arranged on the gables 84 on both sides of the granary 90. The pipe wall 931 of the air inlet pipe 881 is opened to lead out the circulating gas. The air inlet pipe 881 adopts a structure that is easy to disassemble and move, which is convenient for the grain machinery in the granary 90 to enter and exit. When the cold medium of the cold unit 27 is liquid, the cold amount of the cold medium in the cold unit 27 is transferred to the circulating gas, which is transported into the air inlet pipe 881 through the circulating gas pipeline 94, and then returns to the cold unit 27 through the bulk grain pile 89, the air outlet branch pipe 861, and the air outlet main pipe 851. The No. 1 circulating fan 91 and the No. 2 circulating fan 92 provide gas circulation power, thereby realizing low-temperature ventilation grain storage. When the cold medium of the cold unit 27 is gas, it is the circulating gas of low-temperature ventilation grain storage. The hot air delivered by the solar heat generator 7 is sent into the bulk grain pile 89 through the air inlet pipe 881, and then returns to the solar heat generator 7 through the air outlet branch pipe 861 and the air outlet main pipe 851. The No. 1 circulation fan 91 and the No. 2 circulation fan 92 provide gas circulation power, thereby realizing the hot air drying process of the bulk grain pile 89 in the granary 90.

[0040] The transverse ventilation system of the present application is essentially to improve the "one in and one out" gas circulation mode of the gables on both sides of "CN200910085093.1- Grain silo transverse ventilation method and system" into two parallel, opposite air intake or opposite air outlet transverse ventilation systems. Under the same air supply pressure, the resistance of gas passing through the grain pile is reduced by about half, and the power consumption is reduced by at least one third. It is also extremely beneficial for the drying, fumigation and pest control and low-temperature ventilation of grain in the grain pile, and the drying and low-temperature ventilation processing time is effectively shortened.

[0041] The air inlet pipe 881 or the air outlet pipe 88 arranged in the middle adopts a building block structure which is easy to assemble and disassemble and move, so as to facilitate the entry and exit operation of the grain machinery.

[0042] The design and operation of the transverse ventilation system of the present application are carried out with reference to the existing well-known mature technology of transverse ventilation for grain storage, which is described in more detail in the book "Transverse Ventilation Technology for Grain Storage" (written by Li Fujun et al., published by Science Press, Beijing, first edition, first printing in 2016, ISBN 978-7-03-049593-8).

[0043] The present invention can be provided with corresponding dust removal equipment for dust removal of circulating gas, such as bag-type, cyclone dust removal with bypass or electric dust removal equipment.

[0044] Pipelines, instruments, valves, regulating bypasses, etc. not described in this application are matched with mature technologies in known organic heat carrier boilers, solar water heating projects, grain depot drying and grain storage systems.

[0045] Parts not mentioned in this application, such as safety accessories, interlocking protection devices and automatic control, are equipped with existing known technologies.

[0046] Compared with the prior art, the present invention has the following advantages: 1. Compared with the existing technology, the present invention eliminates the problem of low heat utilization efficiency of the existing solar water heating system and photovoltaic utilization system, and uses the solar hot air device to safely and efficiently recover solar heat and store heat in the heat transfer oil. The heat transfer oil at nearly normal pressure and high temperature can facilitate users to make timely, flexible and efficient heat utilization during grain drying, realize continuous drying and long-term solar heat utilization, and has unparalleled advantages over the hot water recovery system; during continuous rainy periods, the heat supplement device can be used to supplement heat conveniently to ensure the smooth drying of grain and avoid mildew caused by excessive moisture in grain; 2. Compared with the existing technology, the present invention uses solar hot air generators to safely and efficiently recover solar heat and store heat in heat transfer oil, and then uses the stored heat transfer oil to drive the adsorption refrigerator for cooling and cold supply, which is used for low-temperature storage of grain in grain depots, heat dissipation of office data centers, air conditioning of office rooms, etc., which is convenient for users to make timely, flexible and efficient cold utilization and realize long-term continuous cooling; 3. Compared with the existing solar water heater technology that directly heats water with heat collecting tubes, since the heat collecting tubes pass through gas, dust is not easy to accumulate, and the heat collecting tubes have high heat transfer efficiency. Unlike the heat collecting tubes that directly heat water, scale is not generated, which affects the heat exchange effect and then blocks the heat collecting tubes. The maintenance cost is extremely low and the operation cycle is greatly extended. In winter, unlike the heat collecting tubes that directly heat water, there will be no ice blockage of the water supply pipeline due to low temperature, and cracking and leakage at the connection between the heat collecting tank and the heat collecting tube; 4. Compared with the existing technology, the heat exchanger heated by thermal oil can be conveniently used for external heating or organic Rankine cycle power generation of solar energy, thereby improving the power supply capacity of the grain depot power system to cope with emergencies; 5. Compared with the prior art, the transverse ventilation system of the present invention is essentially to improve the "one in and one out" gas circulation mode of the two gables of "CN200910085093.1-Granary transverse ventilation method and system" into two parallel, opposite air intake or opposite air outlet transverse ventilation systems. Under the same air supply pressure, the resistance of gas passing through the grain pile is reduced by about half, and the power consumption is reduced by at least one third. It is also very beneficial to the drying, fumigation and pest control of grain piles and low-temperature ventilation, and the drying and low-temperature ventilation processing time is effectively shortened; 6. Compared with the prior art, the technical solution applied for in the present invention can conveniently use inert gases such as nitrogen for nitrogen grain storage, and has strong adaptability, versatility and practicality for drying materials. It can be dried at low temperature or high temperature, and has a large drying temperature range, which can give full play to the characteristics of the heat transfer oil of the present invention, namely, low pressure, high temperature and strong heat storage capacity. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] Figure 1 The present invention is a process flow diagram of a grain depot solar high temperature heat utilization device.

[0048] Figure 1Middle: 1-thermal oil tank, 2-gas space of thermal oil tank, 3-adjusting damper, 4-circulating fan, 5-return air duct, 6-drying chamber, 7-solar heat heater, 8-left header, 9-right header, 10-through heat collecting pipe, 11-dehumidifier, 12-hot air measuring damper, 13-ventilator, 14-heat storage heat exchanger, 15-hot air pipeline, 16-pressure gauge, 17-thermal oil pump, 18-heat exchanger, 19-heated medium, 20-heat supply medium, 21-supplementary heat device, 22-supplementary heat medium, 23-discharge supplementary heat medium, 24-dryer outlet gas pipeline, 25-heat storage Hot air return pipeline, 26-No. 1 adsorber, 27-No. 1 adsorbent, 28-No. 1 heating / cooling channel, 29-No. 1 refrigerant, 30-No. 2 adsorber, 31-No. 2 adsorbent, 32-No. 2 refrigerant, 33-No. 2 heating / cooling channel, 34-condenser, 35-liquid storage tank, 36-evaporator, 37-cooling medium pipeline, 38-cold unit, 39-booster (when the cooling medium is liquid, it is the cooling medium circulation pump; when the cooling medium is air, it is the blower), 40-cooler, 41-cooling air or cooling water, 42-discharging cooling air or cooling water, 43-storage Oil tank, 44-low temperature thermal oil pump, 45-trough collector, 46-condenser; F1 to F20 are valves, including: F2-discharge valve, F3-safety valve, F4-pressure gauge valve, F12-throttle valve, F5-exhaust valve, and the remaining valves are regulating valves or stop valves; R1 to R6, R11 to R19, R21 to R23 are thermal oil pipelines; S1 to S6 are three-way switching valves No. 1 to No. 6 respectively, S1 corresponds to three valve ends a, b, c, end a corresponds to the high temperature thermal oil inlet, end b corresponds to the first adsorption bed, end c corresponds to the second adsorption bed, S2 corresponds to valve ends d, e, f, end e corresponds to Adsorption bed No. 2, end f corresponds to adsorption bed No. 1, end d is the outlet of cooling heat transfer oil, S3 corresponds to valve ends g, h, i, end h corresponds to adsorption bed No. 2, end i corresponds to adsorption bed No. 1, end g is the outlet of gaseous refrigerant, S4 corresponds to valve ends k, j, l, end k corresponds to adsorption bed No. 1, end l corresponds to adsorption bed No. 2, end j is the outlet of high-temperature heat transfer oil, S5 corresponds to valve ends m, n, o, m corresponds to the inlet of cooling heat transfer oil, end o corresponds to adsorption bed No. 1, end n corresponds to adsorption bed No. 2, S6 corresponds to valve ends p, q, r, end p corresponds to the inlet of gaseous refrigerant, r corresponds to adsorption bed No. 1, and q corresponds to adsorption bed No. 2.

[0049] Figure 2 It is a schematic diagram of the structure of the heat pipe type solar heat air device in the present invention.

[0050] Figure 2 In the figure: 7-solar heat heater, 71-vacuum glass tube, 72-heat pipe, 73-sealing plug, 74-header, 75-air inlet of solar heat heater 7, 76-air outlet of solar heat heater 7.

[0051] Figure 3 It is a schematic diagram of the structure of a single-pass heat collecting tube type solar thermal air heater in the present invention.

[0052] Figure 3 In the figure: 7-solar heat heater, 71-vacuum glass tube, 74-header, 75-air inlet of solar heat heater 7, 76-air outlet of solar heat heater 7, 78-inner tube of single-pass heat collecting tube, 79-sealing plug, 80-air inlet main pipe, 81-air inlet branch pipe.

[0053] Figure 4 The present invention is a schematic diagram of a process flow of horizontal ventilation of a flat warehouse.

[0054] Figure 4 In the figure: 7-solar heat generator, 27-cold unit, 84-gable, 85-air inlet main pipe, 86-air inlet branch pipe, 87-sealed film, 88-air outlet pipe, 89-bulk grain pile, 90-grain silo, 91-No. 1 circulation fan, 92-No. 2 circulation fan, 93-air outlet pipe wall, 94-gas circulation pipeline.

[0055] Figure 5 It is another schematic diagram of the process flow of horizontal ventilation of a flat warehouse in the present invention.

[0056] Figure 5 In: 7-solar heat generator, 27-cold unit, 84-gable, 851-air outlet main pipe, 861-air outlet branch pipe, 87-enclosed film, 881-inlet pipe, 89-bulk grain pile, 90-grain silo, 91-No. 1 circulation fan, 92-No. 2 circulation fan, 931-inlet pipe wall, 94-gas circulation pipeline. DETAILED DESCRIPTION

[0057] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0058] Embodiment 1: As attached Figure 1 As shown, a grain depot solar high temperature heat utilization device comprises: Solar thermal air generator 7, recovers heat from solar energy, Drying chamber 6 uses hot gas to dry the grain in the drying chamber 6. The thermal oil tank 1 is used as a heat storage device for heat storage. The thermal oil pump 17 is used to pressurize and transport the thermal oil. The gas coming out of the drying chamber 6 returns to the solar heat generator 7 through the circulation fan 4 and the return air pipeline 5, absorbs solar heat through the heat collecting pipe in the solar heat generator 7, and is then transported to the drying chamber 6; or the gas coming out of the drying chamber 6 returns to the solar heat generator 7 through the return air pipeline 5, absorbs solar heat through the heat collecting pipe in the solar heat generator 7, and is then transported to the drying chamber 6 through the ventilator 13, thereby forming a solar heat recovery and heat release circulation loop for the gas. The heat transfer oil in the heat transfer oil tank 1 is pressurized by the heat transfer oil pump 17 and sent to the heat storage heat exchanger 14 to exchange heat with the hot air sent by the solar hot air device 7. The temperature of the heat transfer oil is increased and returned to the heat transfer oil tank 1 through the heat transfer oil return pipeline, thereby forming a heat storage circulation loop of the heat transfer oil in the heat transfer oil tank 1. The gas coming out of the heat storage heat exchanger 14 returns to the solar heat heater 7 through the circulation fan 4 and the return air pipeline 5, absorbs solar heat through the heat collecting pipes in the solar heat heater 7, and is then transported to the heat storage heat exchanger 14; or the gas coming out of the heat storage heat exchanger 14 returns to the solar heat heater 7 through the return air pipeline 5, absorbs solar heat through the heat collecting pipes in the solar heat heater 7, and is then transported to the heat storage heat exchanger 14 through the ventilator 13, thereby forming another solar heat recovery and heat release circulation loop of the gas.

[0059] At night or on cloudy days, the solar energy recovered by the solar hot air device 7 is not enough to supply the drying chamber 6. The heat transfer oil in the heat transfer oil tank 1 is pressurized by the heat transfer oil pump 17 and sent to the heat storage heat exchanger 14 to exchange heat with the gas sent by the solar hot air device 7. The heat transfer oil with reduced temperature returns to the heat transfer oil tank 1. The gas sent into the solar hot air heater 7 is heated by the heat storage heat exchanger 14 and then sent to the drying chamber 6 to dry the grain. The gas coming out of the drying chamber 6 returns to the solar hot air heater 7 through the circulating fan 4 and the return air pipeline 5, passes through the heat collecting pipe in the solar hot air heater 7, and is then transported to the heat storage heat exchanger 14. Alternatively, the gas sent into the solar hot air heater 7 is heated by the heat storage heat exchanger 14 and then sent to the drying chamber 6 to dry the grain. The gas coming out of the drying chamber 6 returns to the solar hot air heater 7 through the return air pipeline 5, passes through the heat collecting pipe in the solar hot air heater 7, and is then transported to the heat storage heat exchanger 14 through the ventilator 13, thereby forming a heat release circulation loop of the heat storage oil in the heat transfer oil tank 1 and a heat absorption and heat supply circulation loop of the gas.

[0060] The drying chamber 6 can be of various types, and can be a separately arranged drying tower, or the grain can be pre-dehumidified in the drying tower and then transferred to the flat warehouse, and then the wet grain in the flat warehouse can be dried by hot air.

[0061] Dehumidifier 11 is provided: The humid gas coming out of the drying chamber 6 is sent to the solar hot air generator 7 after removing part of the moisture from the grain by the dehumidifier 11, so as to facilitate the removal of moisture from the grain. The dehumidifier 11 uses liquid dehumidification, rotary dehumidification, membrane dehumidification or coupled dehumidification, refrigeration dehumidification and other technologies to adjust the humidity of the dry gas in the drying chamber 6 to a suitable range.

[0062] An adsorption refrigerator is provided, including a first adsorption bed 26, a second adsorption bed 30 and six three-way switching valves S1 to S6. The adsorption refrigerator is used to absorb the heat of the heat transfer oil and realize the refrigeration cycle process of the refrigerant, wherein: Six three-way switching valves S1 to S6, through the opening and closing of the three valve ends corresponding to the six three-way switching valves S1 to S6, the alternating operation of the heating-desorption-condensation and cooling-adsorption-evaporation processes of the first adsorption bed 26 and the second adsorption bed 30 is realized and a continuous refrigeration cycle is realized. S1 corresponds to the three valve ends a, b, c, S2 corresponds to the valve ends d, e, f, S3 corresponds to the valve ends g, h, i, S4 corresponds to the valve ends j, k, l, S5 corresponds to the valve ends m, n, o, S6 corresponds to the valve ends p, q, r (see attached Figure 1 ); as shown in the following table: The first adsorption bed 26 is a heating-desorption-condensation process, and the second adsorption bed 30 is a cooling-adsorption-evaporation process. The four medium circulation processes are as follows: High-temperature heat transfer oil: The high-temperature heat transfer oil coming out of the heat transfer oil tank 1 passes through the heat transfer oil pump 17, pipeline R1, a and b (c is closed) of the No. 1 three-way switching valve S1, and pipeline R2 to enter the No. 1 heating / cooling channel 28 of the No. 1 adsorption bed 26 to heat the adsorbed working medium pair (No. 1 adsorbent 27 and No. 1 refrigerant 29) in the No. 1 adsorption bed 26, and the No. 1 refrigerant 29 is desorbed. The heat transfer oil coming out of the No. 1 heating / cooling channel 28 passes through pipeline R3, k and j (l is closed) of the No. 4 three-way switching valve S4, and pipeline R4 to return to the heat transfer oil tank 1, thereby forming a heating cycle process of the high-temperature heat transfer oil; Refrigerant: The refrigerant No. 1 29 desorbed from the adsorbent No. 1 27 in the adsorbent bed No. 1 26 enters the condenser 34 through the pipeline R15, the i and g (h closed) of the three-way switching valve S3, and the pipeline R19, and exchanges heat with the low-temperature heat transfer oil sent from the valve F11. The refrigerant No. 1 29 is condensed into liquid and enters the liquid storage tank 35, and then enters the evaporator 36 through the throttle valve F12, and exchanges heat with the cooling medium sent from the cold unit 38, absorbing heat and transferring cold. The evaporated gaseous refrigerant No. 1 29 enters the adsorbent bed No. 2 30 through the pipeline R21, the p and q (r closed) of the six-way switching valve S6, and the pipeline R22, and is adsorbed by the adsorbent No. 2 32 in the adsorbent bed No. 2 30, thereby completing the process of heating-desorption-condensation, evaporative cooling, and adsorption of the refrigerant No. 1 29 in the adsorbent bed No. 1 26, and then in the adsorbent bed No. 2 31. Low-temperature heat transfer oil: The low-temperature heat transfer oil from the low-temperature heat transfer oil pump 44 is sent to the condenser 34 through the pipeline R11, the valve F11, and the pipeline R18 to cool the No. 1 refrigerant 29 sent from the pipeline R19 to condense it into a refrigerant liquid. The heat transfer oil from the condenser 34 enters the cooler 40 through the pipeline R17 for cooling. The cooled low-temperature heat transfer oil enters the oil storage tank 43 and then returns to the low-temperature heat transfer oil pump 44, thus forming a circulation process of the low-temperature heat transfer oil. The low-temperature heat transfer oil from the low-temperature heat transfer oil pump 44 is sent to the condenser 34 through the pipeline R11, the valve F11, and the No. 5 three-way switching valve S5. n (0 closed), pipe R12 is sent into the No. 2 heating / cooling channel 33 in the No. 2 adsorption bed 30, the adsorption working medium pair in the No. 2 adsorption bed 30 is cooled, and the heat generated when the No. 2 adsorbent 31 adsorbs the No. 1 refrigerant 29 is removed. The heat transfer oil coming out of the No. 2 heating / cooling channel 33 in the No. 2 adsorption bed 30 passes through the pipe R5, the e and d (f closed) of the No. 2 three-way switching valve S2, and the pipe R14 to enter the cooler 40 for cooling. The cooled low-temperature heat transfer oil enters the oil storage tank 43 and then returns to the low-temperature heat transfer oil pump 44, thereby forming another circulation process of low-temperature heat transfer oil; Cooling medium: The cooling medium from the cooling unit 38 is sent to the evaporator 36 through the booster 39, absorbs the cooling energy generated by the evaporation of the liquid in the evaporator 36, and is sent to the cooling unit 38 through the cooling medium pipeline 37, thereby forming a circulation loop of the cooling medium; when the cooling medium is air, the booster 39 is a blower; when the cooling medium is liquid, the booster P3 is a liquid circulation pump; When the first adsorption bed 26 is in the cooling-adsorption-evaporation process and the second adsorption bed 30 is in the heating-desorption-condensation process, the four medium circulation processes are as follows: High-temperature heat transfer oil: The high-temperature heat transfer oil coming out of the heat transfer oil tank 1 passes through the heat transfer oil pump 17, the pipeline R1, a and c (b is closed) of the No. 1 three-way switching valve S1, and the pipeline R5 to enter the No. 2 heating / cooling channel 33 of the No. 2 adsorption bed 30 to heat the adsorbed working medium pair (No. 2 adsorbent 31 and No. 2 refrigerant 32) in the No. 2 adsorption bed 30, and the No. 2 refrigerant 32 is desorbed. The heat transfer oil coming out of the No. 2 heating / cooling channel 33 passes through the pipeline R6, l and j (k is closed) of the No. 4 three-way switching valve S4, and the pipeline R4 to return to the heat transfer oil tank 1, thereby forming a heating cycle process of the high-temperature heat transfer oil; Refrigerant: The No. 2 refrigerant 32 desorbed from the No. 2 adsorbent 31 in the No. 2 adsorbent bed 30 enters the condenser 34 through the pipeline R16, the h and g (i is closed) of the No. 3 three-way switching valve S3, and the pipeline R19, and exchanges heat with the low-temperature heat transfer oil sent from the valve F11. The No. 2 refrigerant 32 is condensed into liquid and enters the liquid storage tank 35 (which may not be set), and then enters the evaporator 36 through the throttle valve F12, and exchanges heat with the cold medium sent from the cold unit 38, absorbing heat and transferring cold. The evaporated gaseous No. 2 refrigerant 32 enters the No. 1 adsorbent bed 26 through the pipeline R21, the p and r (o is closed) of the No. 6 three-way switching valve S6, and the pipeline R23, and is adsorbed by the No. 1 adsorbent 27 in the No. 1 adsorbent bed 26, thereby completing the process of heating-desorption-condensation, evaporative cooling, and adsorption of the No. 1 adsorbent 27 in the No. 1 adsorbent bed 26 by the No. 1 adsorbent 27; Low-temperature heat transfer oil: The low-temperature heat transfer oil from the low-temperature heat transfer oil pump 44 is sent to the condenser 34 through the pipeline R11, the valve F11, and the pipeline R18 to cool the No. 2 refrigerant 32 sent from the pipeline R19, so that it is condensed into a refrigerant liquid. The heat transfer oil from the condenser 34 enters the cooler 40 through the pipeline R17 for cooling. The cooled low-temperature heat transfer oil enters the oil storage tank 43 and then returns to the low-temperature heat transfer oil pump 44, thus forming a circulation process of the low-temperature heat transfer oil; the low-temperature heat transfer oil from the low-temperature heat transfer oil pump 44 is sent to the condenser 34 through the pipeline R11, the m and o (n is closed), pipe R13 is sent into the No. 1 heating / cooling channel 28 in the No. 1 adsorption bed 26, the adsorption working medium pair in the No. 1 adsorption bed 26 is cooled, and the heat generated when the No. 1 adsorbent 27 adsorbs the No. 2 refrigerant 32 is removed. The heat transfer oil coming out of the No. 1 heating / cooling channel 28 in the No. 1 adsorption bed 26 passes through the pipe R2, f and d (e is closed) of the No. 2 three-way switching valve S2, and the pipe R14 to enter the cooler 40 for cooling. The cooled low-temperature heat transfer oil enters the oil storage tank 43 and then returns to the low-temperature heat transfer oil pump 44, thereby forming another circulation process of the low-temperature heat transfer oil; Cooling medium: The cooling medium from the cooling unit 38 is sent to the evaporator 36 through the booster 39, absorbs the cooling energy generated by the evaporation of the liquid in the evaporator 36, and is sent to the cooling unit 38 through the cooling medium pipeline 37, thereby forming a circulation loop of the cooling medium; when the cooling medium is air, the booster 39 is a blower; when the cooling medium is liquid, the booster P3 is a liquid circulation pump; The above process is performed alternately, thereby realizing the continuous cooling process of the adsorption refrigerators operating in parallel with two beds to the cooling unit 38.

[0063] The cooler 40 is cooled by water or air, for example, the cooling water is river water, river water or sea water, etc. The cooling water 41 enters the cooler 40, and the generated high-temperature cooling water 42 is discharged; When the cooler 40 adopts a closed cooling tower, a conventional closed cooling tower cooling cycle process is adopted.

[0064] The adsorption working medium pair in the first adsorption bed 26 and the second adsorption bed 30 is activated carbon-methanol.

[0065] A heat exchanger 18 is provided: The heat transfer oil in the heat transfer oil tank 1 enters the heat transfer oil pump 17 to increase the pressure, and the pressurized heat transfer oil is transported to the heat exchanger 18 to heat the heated working medium 19 into the heat supply medium 20, and the heat transfer oil coming out of the heat exchanger 18 returns to the heat transfer oil tank 1, thereby forming a heat supply circulation loop of the heat transfer oil in the heat transfer oil tank 1. For example, the heat exchanger 18 is used as an organic working medium evaporator of the organic Rankine cycle unit. At this time, the heat transfer oil passing through the heat exchanger 18 is the heat source of the organic working medium evaporator, which is used to heat and vaporize the liquid organic working medium transported by the organic working medium circulation pump to generate high-temperature gaseous organic working medium, enter the organic working medium gas turbine to drive the organic working medium generator to generate electricity, and the low-temperature and low-pressure organic working medium vapor coming out of the organic working medium gas turbine enters the organic working medium condenser to be liquefied, and then returns to the organic working medium circulation pump, thereby forming an organic working medium Rankine cycle loop.

[0066] The heat collecting tube of the solar hot air device 7 is a through heat collecting tube 10 .

[0067] For example, Figure 1As shown, a plurality of through heat collecting tubes 10 are used in parallel, and two groups of solar hot air heaters 7 (double header hot air heaters) are used in series. The solar hot air heater 7 comprises a left header 8, a right header 9, and a through heat collecting tube 10. A plurality of through heat collecting tubes 10 connected in parallel are arranged between the left header 8 and the right header 9. The through heat collecting tubes 10 absorb the heat of solar energy and heat the gas entering the right header 9. The generated high-temperature gas is drawn out from the left header 8, transported to the drying chamber 11 for drying the Panax notoginseng, and then returned to the right header 9, thereby forming a closed-loop gas circulation loop of the through heat collecting tube type solar hot air heater 7; the outlet hot air of one group of solar hot air heaters 7 is used in series as the inlet gas of another group of solar hot air heaters; For example, Figure 1 As shown, multiple through-collecting tubes 10 are used in series and two groups of solar hot air heaters 7 (trough-type hot air heaters) are used in series. The solar hot air heater 7 includes a trough-type collector 45, a concentrating plate 46 and a through-collecting tube 10. Gas enters the multiple through-collecting tubes 10 connected in series. The through-collecting tubes 10 absorb the heat of the solar energy and heat the incoming gas. The generated high-temperature gas is drawn out and used in series as the incoming gas of another group of solar hot air heaters.

[0068] Preferably, the through-tube heat collecting tube 10 adopts a vacuum collector, the inner layer of the heat collecting tube is a stainless steel tube, the outer layer is a glass tube plus metal bellows at both ends, and the outer surface of the inner tube is coated with a selective absorption coating to achieve maximum absorption rate of direct solar radiation and minimum infrared wave re-radiation.

[0069] A supplementary heat device 21 is provided: the supplementary heat device 21 is arranged between the solar hot air device 7 and the heat storage heat exchanger 14, and adopts electric heating, compressed air heat, fuel combustion heat, etc. to supplement the heat required by the drying chamber 6 and the heat transfer oil tank 1. For example, the supplementary heat medium 22 adopts hot air formed by the combustion of natural gas, enters the supplementary heat device 21 to heat the air sent by the solar hot air device 7, and the low-temperature flue gas formed is discharged by discharging the supplementary heat medium 23.

[0070] The circulating fan 4 is provided with an adjusting damper 3 for adjusting the air supply volume of the circulating fan 4 .

[0071] The ventilator 13 is provided with a hot air regulating damper 12 for adjusting the air supply volume of the ventilator 13 .

[0072] The circulating fan 4 and the ventilator 13 are substantially the same, and the names are only used to distinguish them.

[0073] The circulating fan 4 or the ventilator 13 is a centrifugal, axial flow, screw or vortex fan.

[0074] The solar heat generator 7 is provided with necessary support rods or support frames to securely, stably and effectively fix the solar heat generator to avoid tipping accidents caused by strong winds.

[0075] The inlet pipeline of the thermal oil pump 17 is provided with a filter for filtering solid impurity particles in the thermal oil in the inlet pipeline.

[0076] The heat transfer oil tank 1 in the heat transfer oil system plays the role of oil and gas separation, buffering, heat storage and storage, and insulation measures need to be taken.

[0077] The heat transfer oil system is provided with necessary exhaust valves and safety valves.

[0078] The thermal oil tank 1 adopts a vertical structure, which facilitates the compact arrangement of the system.

[0079] The circulating fan 4 or the ventilator 13 adopts a variable frequency speed regulation operation mode, and flexibly adjusts the air supply volume and air supply pressure when the sunshine and heating conditions change.

[0080] The absorption refrigerator of this system can adopt measures such as cooling back, quality return and distillation.

[0081] Based on "CN200910085093.1- Grain Silo Transverse Ventilation Method and System", this application proposes an improved solution for the transverse ventilation system in combination with the above technical solution, as shown in the attached Figure 4 , Attachment Figure 5 shown.

[0082] As attached Figure 4 , using the method of air intake through the gables on both sides and air outlet in the middle of the grain pile: The bulk grain pile 90 is covered with a closed film 87, an air outlet pipe 88 is arranged in the middle of the granary 90, and an air inlet main pipe 85 and an air inlet branch pipe 86 are arranged on the gables 84 on both sides of the granary 90. The air outlet pipe wall 93 of the air outlet pipe 88 is opened for introducing circulating gas. The air outlet pipe 88 adopts a structure that is easy to disassemble and move, which is convenient for the grain machinery in the granary 90 to enter and exit. When the cold medium of the cold unit 27 is liquid, the cold amount of the cold medium in the cold unit 27 is transferred to the circulating gas 94, and the circulating gas is sent to the bulk grain pile 89 through the air inlet main pipe 85 and the air inlet branch pipe 86, and then returns to the cold unit 27 through the air outlet pipe 88 and the circulating gas pipeline 94. The No. 1 circulating fan 91 and the No. 2 circulating fan 92 provide gas circulation power, thereby realizing low-temperature ventilation grain storage. When the cold medium of the cold unit 27 is gas, it is the circulating gas of low-temperature ventilation grain storage. The hot air delivered by the solar heat heater 7 is sent into the bulk grain pile 89 through the air intake main pipe 85 and the air intake branch pipe 86, and then returns to the solar heat heater 7 through the air outlet pipe 88 and the circulating gas pipeline 94. The No. 1 circulating fan 91 and the No. 2 circulating fan 92 provide gas circulation power, thereby realizing the hot air drying process of the bulk grain pile 89 in the granary 90.

[0083] As attached Figure 5 , using the method of air outlet on both sides of the gable and air intake in the middle of the grain pile: The bulk grain pile 90 is covered with a closed film 87, an air inlet pipe 881 is arranged in the middle of the granary 90, and an air outlet main pipe 851 and an air outlet branch pipe 861 are arranged on the gables 84 on both sides of the granary 90. The pipe wall 931 of the air inlet pipe 881 is opened to lead out the circulating gas. The air inlet pipe 881 adopts a structure that is easy to disassemble and move, which is convenient for the grain machinery in the granary 90 to enter and exit. When the cold medium of the cold unit 27 is liquid, the cold amount of the cold medium in the cold unit 27 is transferred to the circulating gas, which is transported into the air inlet pipe 881 through the circulating gas pipeline 94, and then returns to the cold unit 27 through the bulk grain pile 89, the air outlet branch pipe 861, and the air outlet main pipe 851. The No. 1 circulating fan 91 and the No. 2 circulating fan 92 provide gas circulation power, thereby realizing low-temperature ventilation grain storage. When the cold medium of the cold unit 27 is gas, it is the circulating gas of low-temperature ventilation grain storage. The hot air delivered by the solar heat generator 7 is sent into the bulk grain pile 89 through the air inlet pipe 881, and then returns to the solar heat generator 7 through the air outlet branch pipe 861 and the air outlet main pipe 851. The No. 1 circulation fan 91 and the No. 2 circulation fan 92 provide gas circulation power, thereby realizing the hot air drying process of the bulk grain pile 89 in the granary 90.

[0084] The transverse ventilation system of the present application is essentially to improve the "one in and one out" gas circulation mode of the gables on both sides of "CN200910085093.1- Grain silo transverse ventilation method and system" into two parallel, opposite air intake or opposite air outlet transverse ventilation systems. Under the same air supply pressure, the resistance of gas passing through the grain pile is reduced by about half, and the power consumption is reduced by at least one third. It is also extremely beneficial for the drying, fumigation and pest control and low-temperature ventilation of grain in the grain pile, and the drying and low-temperature ventilation processing time is effectively shortened.

[0085] The air inlet pipe 881 or the air outlet pipe 88 disposed in the middle adopts a building block structure that is easy to assemble and disassemble and move, and is convenient for the entry and exit operations of the grain machinery.

[0086] The design and operation of the transverse ventilation system of the present application are carried out with reference to the existing well-known mature technology of transverse ventilation for grain storage, which is described in more detail in the book "Transverse Ventilation Technology for Grain Storage" (written by Li Fujun et al., published by Science Press, Beijing, first edition, first printing in 2016, ISBN 978-7-03-049593-8).

[0087] The present invention can be provided with corresponding dust removal equipment for dust removal of circulating gas, such as bag-type, cyclone dust removal with bypass or electric dust removal equipment.

[0088] Pipelines, instruments, valves, regulating bypasses, etc. not described in this application are matched with mature technologies in known organic heat carrier boilers, solar water heating projects, grain depot drying and grain storage systems.

[0089] Parts not mentioned in this application, such as safety accessories, interlocking protection devices and automatic control, are equipped with existing known technologies.

[0090] Although the present invention has been disclosed as above with preferred embodiments, they are not intended to limit the present invention. Anyone familiar with the art can make various changes or modifications without departing from the spirit and scope of the present invention, which also belong to the protection scope of the present invention. Therefore, the protection scope of the present invention shall be based on the definition of the claims of this application.

Claims

1. A grain depot solar high temperature heat utilization device, characterized in that: include: The solar thermal air generator (7) recovers heat from solar energy. The drying chamber (6) dries the grain in the drying chamber (6) using hot gas. The thermal oil tank (1) serves as a heat storage device for storing heat. The heat transfer oil pump (17) is used to pressurize and transport the heat transfer oil. The gas coming out of the drying chamber (6) returns to the solar hot air heater (7) through the circulation fan (4) and the return air pipeline (5), absorbs solar heat through the heat collecting pipe in the solar hot air heater (7), and is then transported to the drying chamber (6); or the gas coming out of the drying chamber (6) returns to the solar hot air heater (7) through the return air pipeline (5), absorbs solar heat through the heat collecting pipe in the solar hot air heater (7), and is then transported to the drying chamber (6) through the ventilator (13), thereby forming a solar heat recovery and heat release circulation loop for the gas. The heat transfer oil in the heat transfer oil tank (1) is pressurized by a heat transfer oil pump (17) and sent to a heat storage heat exchanger (14) to exchange heat with hot air sent by a solar hot air generator (7). The heat transfer oil with increased temperature returns to the heat transfer oil tank (1) through a heat storage heat transfer oil return pipeline (34), thereby forming a heat storage circulation loop of the heat transfer oil in the heat transfer oil tank (1). The gas coming out of the heat storage heat exchanger (14) returns to the solar heat generator (7) via the circulation fan (4) and the return air pipeline (5), absorbs solar heat through the heat collecting pipe in the solar heat generator (7), and is then transported to the heat storage heat exchanger (14); or the gas coming out of the heat storage heat exchanger (14) returns to the solar heat generator (7) via the return air pipeline (5), absorbs solar heat through the heat collecting pipe in the solar heat generator (7), and is then transported to the heat storage heat exchanger (14) via the ventilator (13), thereby forming another solar heat recovery and heat release circulation loop of the gas.

2. The grain depot solar high temperature heat utilization device according to claim 1 is characterized in that: At night or on cloudy days, the solar energy recovered by the solar hot air device (7) is insufficient for use in the drying chamber (6). The heat transfer oil in the heat transfer oil tank (1) is pressurized by the heat transfer oil pump (17) and sent to the heat storage heat exchanger (14) to exchange heat with the gas sent from the solar hot air device (7). The heat transfer oil with a lowered temperature returns to the heat transfer oil tank (1). The gas sent into the solar hot air device (7) is heated by the heat storage heat exchanger (14) and then sent into the drying chamber (6) to dry the grain. The gas coming out of the drying chamber (6) returns to the solar hot air device (7) through the circulating fan (4) and the return air pipeline (5), passes through the heat collecting pipe in the solar hot air device (7), and is then sent to the heat storage heat exchanger (14). Alternatively, the gas sent into the solar hot air device (7) is heated by the heat storage heat exchanger (14) and then sent into the drying chamber (6) to dry the grain. The gas coming out of the drying chamber (6) returns to the solar hot air device (7) through the return air pipeline (5), passes through the heat collecting pipe in the solar hot air device (7), and is then sent to the heat storage heat exchanger (14) through the ventilator (13), thereby forming a heat release circulation loop of the heat storage oil in the heat transfer oil tank (1) and a heat absorption and heat supply circulation loop of the gas.

3. The grain depot solar high temperature heat utilization device according to claim 1 is characterized in that: An adsorption refrigerator is provided, comprising a first adsorption bed (26), a second adsorption bed (30) and six three-way switching valves S1 to S6, wherein: Six three-way switching valves S1 to S6, through the opening and closing of the three valve ends corresponding to the six three-way switching valves S1 to S6, the alternating operation of the heating-desorption-condensation and cooling-adsorption-evaporation processes of the first adsorption bed (26) and the second adsorption bed (30) is realized and a continuous refrigeration cycle is realized. S1 corresponds to the three valve ends a, b, c, S2 corresponds to the valve ends d, e, f, S3 corresponds to the valve ends g, h, i, S4 corresponds to the valve ends j, k, l, S5 corresponds to the valve ends m, n, o, and S6 corresponds to the valve ends p, q, r, as shown in the following table: ， The first adsorption bed (26) is a heating-desorption-condensation process, and the second adsorption bed (30) is a cooling-adsorption-evaporation process. The four medium circulation processes are as follows: High-temperature heat transfer oil: the high-temperature heat transfer oil coming out of the heat transfer oil tank (1) passes through the heat transfer oil pump (17), the pipeline R1, the a and b (c is closed) of the No. 1 three-way switching valve S1, and the pipeline R2 to enter the No. 1 heating / cooling channel (28) of the No. 1 adsorption bed (26) to heat the adsorbed working medium pair in the No. 1 adsorption bed (26), and the No. 1 refrigerant (29) is desorbed. The heat transfer oil coming out of the No. 1 heating / cooling channel (28) passes through the pipeline R3, the k and j (l is closed) of the No. 4 three-way switching valve S4, and the pipeline R4 to return to the heat transfer oil tank (1), thereby forming a heat supply cycle process of the high-temperature heat transfer oil; Refrigerant: The refrigerant No. 1 (29) desorbed from the adsorbent No. 1 (27) in the adsorbent No. 1 bed (26) enters the condenser (34) through the pipeline R15, the i and g (h closed) of the three-way switching valve S3, and the pipeline R19, and performs heat exchange with the low-temperature heat transfer oil sent from the valve F11. The refrigerant No. 1 (29) is condensed into liquid, and enters the evaporator (36) through the throttle valve F12, and performs heat exchange with the cooling medium sent from the cooling unit (38). The evaporated gaseous refrigerant No. 1 (29) enters the adsorbent No. 2 bed (30) through the pipeline R21, the p and q (r closed) of the six-way switching valve S6, and the pipeline R22, and is adsorbed by the adsorbent No. 2 (32) in the adsorbent No. 2 bed (30), thereby completing the process of heating-desorption-condensation, evaporative cooling, and adsorption of the refrigerant No. 1 (29) in the adsorbent No. 1 bed (26) by the adsorbent No. 2 (31) in the adsorbent No. 2 bed (30); Low-temperature heat transfer oil: The low-temperature heat transfer oil from the low-temperature heat transfer oil pump (44) is sent to the condenser (34) through the pipeline R11, the valve F11, and the pipeline R18 to cool the No. 1 refrigerant (29) sent from the pipeline R19, so that it is condensed into a refrigerant liquid. The heat transfer oil from the condenser (34) enters the cooler (40) through the pipeline R17 for cooling. The cooled low-temperature heat transfer oil enters the oil storage tank (43) and then returns to the low-temperature heat transfer oil pump (44), thereby forming a circulation process of the low-temperature heat transfer oil. The low-temperature heat transfer oil from the low-temperature heat transfer oil pump (44) is sent to the condenser (34) through the pipeline R11, the m and n of the No. 5 three-way switching valve S5 ( 0 closed), pipe R12 is sent into the second heating / cooling channel (33) in the second adsorption bed (30), the adsorption working medium pair in the second adsorption bed (30) is cooled, and the heat generated when the second adsorbent (31) adsorbs the first refrigerant (29) is removed. The heat transfer oil coming out of the second heating / cooling channel (33) in the second adsorption bed (30) passes through pipe R5, e and d (f closed) of the second three-way switching valve S2, and pipe R14 to enter the cooler (40) for cooling. The cooled low-temperature heat transfer oil enters the oil storage tank (43) and then returns to the low-temperature heat transfer oil pump (44), thereby forming another low-temperature heat transfer oil circulation process; Cooling medium: The cooling medium from the cooling unit (38) is sent to the evaporator (36) through the booster (39), absorbs the cooling energy generated by the evaporation of the liquid in the evaporator (36), and is sent to the cooling unit (38) through the cooling medium pipeline (37), thereby forming a circulation loop of the cooling medium; When the first adsorption bed (26) is in the cooling-adsorption-evaporation process and the second adsorption bed (30) is in the heating-desorption-condensation process, the four medium circulation processes are as follows: High-temperature heat transfer oil: the high-temperature heat transfer oil coming out of the heat transfer oil tank (1) passes through the heat transfer oil pump (17), the pipeline R1, the a and c (b closed) of the No. 1 three-way switching valve S1, and the pipeline R5 to enter the No. 2 heating / cooling channel (33) of the No. 2 adsorption bed (30) to heat the adsorbed working medium pair in the No. 2 adsorption bed (30), and the No. 2 refrigerant (32) is desorbed. The heat transfer oil coming out of the No. 2 heating / cooling channel (33) passes through the pipeline R6, the l and j (k closed) of the No. 4 three-way switching valve S4, and the pipeline R4 to return to the heat transfer oil tank (1), thereby forming a heat supply cycle process of the high-temperature heat transfer oil; Refrigerant: The No. 2 refrigerant (32) desorbed from the No. 2 adsorbent (31) in the No. 2 adsorbent bed (30) enters the condenser (34) through the pipeline R16, the h and g (i closed) of the No. 3 three-way switching valve S3, and the pipeline R19, and performs heat exchange with the low-temperature heat transfer oil sent from the valve F11. The No. 2 refrigerant (32) is condensed into liquid, enters the evaporator (36) through the throttle valve F12, and performs heat exchange with the cooling medium sent from the cold unit (38). The evaporated gaseous No. 2 refrigerant (32) enters the No. 1 adsorbent bed (26) through the pipeline R21, the p and r (o closed) of the No. 6 three-way switching valve S6, and the pipeline R23, and is adsorbed by the No. 1 adsorbent (27) in the No. 1 adsorbent bed (26), thereby completing the process of heating-desorption-condensation, evaporative cooling, and adsorption of the No. 1 adsorbent (27) in the No. 1 adsorbent bed (26) by the No. 1 adsorbent (32). Low-temperature heat transfer oil: The low-temperature heat transfer oil from the low-temperature heat transfer oil pump (44) is sent to the condenser (34) through the pipeline R11, the valve F11, and the pipeline R18 to cool the No. 2 refrigerant (32) sent from the pipeline R19, so that it condenses into a refrigerant liquid. The heat transfer oil from the condenser (34) enters the cooler (40) through the pipeline R17 for cooling. The cooled low-temperature heat transfer oil enters the oil storage tank (43) and then returns to the low-temperature heat transfer oil pump (44), thereby forming a circulation process of the low-temperature heat transfer oil. The low-temperature heat transfer oil from the low-temperature heat transfer oil pump (44) is sent to the condenser (34) through the pipeline R11, the m and o of the No. 5 three-way switching valve S5 ( n closed), pipe R13 is sent into the first heating / cooling channel (28) in the first adsorption bed (26), the adsorption working medium pair in the first adsorption bed (26) is cooled, and the heat generated when the first adsorbent (27) adsorbs the second refrigerant (32) is removed. The heat transfer oil coming out of the first heating / cooling channel (28) in the first adsorption bed (26) passes through the pipe R2, f and d (e closed) of the second three-way switching valve S2, and the pipe R14 to enter the cooler (40) for cooling. The cooled low-temperature heat transfer oil enters the oil storage tank (43) and then returns to the low-temperature heat transfer oil pump (44), thereby forming another low-temperature heat transfer oil circulation process; Cooling medium: The cooling medium from the cooling unit (38) is sent to the evaporator (36) through the booster (39), absorbs the cooling energy generated by the evaporation of the liquid in the evaporator (36), and is sent to the cooling unit (38) through the cooling medium pipeline (37), thereby forming a circulation loop of the cooling medium; The above process is performed alternately, thereby realizing a continuous cooling process for the cooling unit (38) by the adsorption refrigerator with two adsorption beds operating in parallel.

4. The grain depot solar high temperature heat utilization device according to claim 1, characterized in that: A heat exchanger (18) is provided: The heat transfer oil in the heat transfer oil tank (1) enters the heat transfer oil pump (17) for pressure increase. The pressure-increased heat transfer oil is transported to the heat exchanger (18) to heat the heated working medium (19) into a heat supply medium (20). The heat transfer oil from the heat exchanger (18) returns to the heat transfer oil tank (1), thereby forming a heat supply circulation loop for the heat transfer oil storing heat in the heat transfer oil tank (1).

5. The grain depot solar high temperature heat utilization device according to claim 1, characterized in that: A supplementary heat device (21) is provided: the supplementary heat device (21) is arranged between the solar hot air device (7) and the heat storage heat exchanger (14), and uses electric heating, compressed air heat, and fuel combustion heat to heat the gas to supplement the heat required by the drying chamber (6) and / or the heat transfer oil tank (1).

6. The grain depot solar high temperature heat utilization device according to claim 1, characterized in that: The heat collecting tube of the solar thermal air heater (7) comprises a through heat collecting tube (10), a heat pipe (72) or a single-pass heat collecting tube.

7. The grain depot solar high temperature heat utilization device according to claim 3 is characterized in that: A horizontal ventilation system is provided, with air entering from the gables on both sides and air exiting from the middle of the grain pile: A closed film (87) is covered on the bulk grain pile (90), an air outlet pipe (88) is arranged in the middle of the grain bin (90), and an air inlet main pipe (85) and an air inlet branch pipe (86) are arranged on the gables (84) on both sides of the grain bin (90). A hole is opened in the air outlet pipe wall (93) of the air outlet pipe (88) for introducing circulating gas. The air outlet pipe (88) adopts a structure that is easy to disassemble and move, so as to facilitate the entry and exit operation of grain machinery in the grain bin (90). When the cooling medium of the cooling unit (27) is liquid, The coldness of the cold medium in the cold unit (27) is transferred to the circulating gas, and the circulating gas is sent to the bulk grain pile (89) through the air intake main pipe (85) and the air intake branch pipe (86), and then returns to the cold unit (27) through the air outlet pipe (88) and the circulating gas pipeline (94). The first circulating fan (91) and the second circulating fan (92) provide gas circulation power, thereby realizing low-temperature ventilation grain storage. When the cold medium in the cold unit (27) is gas, it is the circulating gas of the low-temperature ventilation grain storage; The hot air delivered by the solar hot air device (7) is delivered to the bulk grain pile (89) through the air intake main pipe (85) and the air intake branch pipe (86), and then returns to the solar hot air device (7) through the air outlet pipe (88) and the circulating gas pipeline (94). The No. 1 circulating fan (91) and the No. 2 circulating fan (92) provide gas circulation power, thereby realizing the hot air drying process of the bulk grain pile (89) in the granary (90).

8. The grain depot solar high temperature heat utilization device according to claim 3, characterized in that: A horizontal ventilation system is provided, with air outlet from the gables on both sides and air intake from the middle of the grain pile: A closed film (87) is covered on the bulk grain pile (90), an air inlet pipe (881) is arranged in the middle of the grain bin (90), and an air outlet main pipe (851) and an air outlet branch pipe (861) are arranged on the gables (84) on both sides of the grain bin (90). A hole is opened in the pipe wall (931) of the air inlet pipe (881) for leading out the circulating gas. The air inlet pipe (881) adopts a structure that is easy to disassemble and move, so as to facilitate the entry and exit operation of the grain machinery in the grain bin (90). The cooling medium of the cooling unit (27) is liquid. When the cooling medium in the cold unit (27) is transferred to the circulating gas, the cold is transported into the air inlet pipe (881) through the circulating gas pipeline (94), and then returns to the cold unit (27) through the bulk grain pile (89), the outlet branch pipe (861), and the outlet main pipe (851). The No. 1 circulating fan (91) and the No. 2 circulating fan (92) provide gas circulation power, thereby realizing low-temperature ventilation grain storage. When the cooling medium in the cold unit (27) is gas, it is the circulating gas of the low-temperature ventilation grain storage. The hot air delivered by the solar hot air device (7) is delivered to the bulk grain pile (89) through the air inlet pipe (881), and then returns to the solar hot air device (7) through the air outlet branch pipe (861) and the air outlet main pipe (851). The No. 1 circulation fan (91) and the No. 2 circulation fan (92) provide gas circulation power, thereby realizing the hot air drying process of the bulk grain pile (89) in the granary (90).

9. The grain depot solar high temperature heat utilization device according to claim 1, characterized in that: Equipped with a dehumidifier (11): The humid gas coming out of the drying chamber (6) is sent to the solar hot air heater (7) after some moisture is removed by the dehumidifier (11).

10. The grain depot solar high temperature heat utilization device according to claim 3, characterized in that: The adsorption working medium pairs in the first adsorption bed (26) and the second adsorption bed (30) include activated carbon-methanol, zeolite-water, silica gel-water, calcium chloride-ammonia, strontium chloride-ammonia, and activated carbon-ethanol.

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