Drying system

Abstract

The utility model relates to a drying system, which adopts a solar air heater, heat storage of a heat-conducting oil system, absorption refrigeration and heat pump heat supply dehumidification technology, realizes efficient utilization of solar heat in an article drying and cold using unit, solves the problem of utilization of the existing solar energy in the drying system, is convenient to install, maintain and maintain, is safe and efficient, and has the advantages of energy conservation and environmental protection. And social, economic and ecological benefits are expected to be remarkable.

Description

TECHNICAL FIELD

[0001] The utility model relates to drying technical field especially relates to a drying system adopting solar energy hot air dryer, heat pump, heat conducting oil heat storage technology. BACKGROUND

[0002] Heat pump technology is widely used in drying of medicinal materials, food, agricultural products, electronic products and the like, and has the characteristics of energy saving, environmental protection, rapid drying, low-temperature drying and the like. However, the current heat pump drying equipment is mainly used for heating, and the heating temperature is not high. Changes in the relative humidity of the outside world will affect the moisture content of the inlet air of the drying system, and thus affect the drying effect, resulting in a decrease in the drying rate.

[0003] Solar heat utilization application forms include solar hot water supply, solar heating, solar refrigeration, solar industrial and agricultural applications, and photovoltaic-thermal integrated (PV / T) applications.

[0004] Solar water heating system: In 2009, there were more than 3,000 solar water heating system enterprises in China, with an annual production of about 40 million square meters of products, and a total of 145 million square meters of products, accounting for 78% and 54% of the world respectively. The main use of solar water heaters is to produce hot water below 100℃. If the temperature of the hot water is 150-200℃, the water in this temperature range will not boil and vaporize, and it will maintain a pressure of 0.5-1.6 MPa, which requires a high-pressure container and pipe valves, and may flash out steam during use, which is not convenient for actual use. The hot water produced by the solar water heating system cannot be used in time and completely, which may cause waste. In addition, the problem of scale formation and leakage of the solar water heating system is a persistent problem.

[0005] Photovoltaic system: The efficiency of photovoltaic power generation is relatively low, because the photovoltaic panel mainly absorbs visible light and infrared rays in solar radiation, and has weak absorption capacity for ultraviolet light and blue light. In actual application, the conversion efficiency of crystalline silicon photovoltaic cells is only 13%-26%; silicon crystal materials are needed in photovoltaic power generation technology, and the main raw material of crystalline silicon cells is pure silicon, which needs to be treated through multiple chemical and physical processes in the production and purification process, not only consuming a large amount of energy, but also causing certain pollution to the environment. Moreover, photovoltaic power is an unstable power source, which is limited in grid connection and needs to be equipped with energy storage devices.

[0006] China is a real largest producer and user of solar water heating systems, and a large user of photovoltaics. How to change from a large user of solar heat to a strong user of solar heat, store the heat obtained in the process of solar heat conversion in a low-cost, simple and convenient way, eliminate the problem of scale formation in the existing solar water heating system, and combine with absorption refrigerators and heat pump dehumidification technology for efficient operation of the drying system, is worth further studying. SUMMARY

[0007] The utility model discloses a drying system, which is characterized by the following technical scheme: a solar heat collector 1 is arranged on the roof of a drying room 2, a circulating fan 4 is arranged on the drying room 2, a return air pipeline 5 is arranged on the drying room 2, a drying device 6 is arranged in the drying room 2, a heat pump 8 is arranged on the drying room 2, a dehumidification and temperature increasing device 11 is arranged on the drying room 2, and a ventilation fan 13 is arranged on the drying room 2.

[0008] A drying system, comprising:

[0009] A solar heat collector 7 is arranged on the drying room 2, and the solar heat collector 7 is connected to the circulating fan 4 and the return air pipeline 5.

[0010] A drying device 6 is arranged in the drying room 2, and the drying device 6 is connected to the circulating fan 4 and the return air pipeline 5.

[0011] A dehumidification and temperature increasing device 11 is arranged on the drying room 2, and the dehumidification and temperature increasing device 11 is connected to the circulating fan 4 and the return air pipeline 5.

[0012] The dehumidification and temperature increasing device 11 comprises a gas compressor 111, a drying line condenser 112, a drying line evaporator 113, and connecting pipelines.

[0013] The gas compressor 111 is connected to the circulating fan 4 and the return air pipeline 5, the drying line condenser 112 is connected to the return air pipeline 5, and the drying line evaporator 113 is connected to the return air pipeline 5.

[0014] The gas compressor 111 is connected to the circulating fan 4 and the return air pipeline 5, the drying line condenser 112 is connected to the return air pipeline 5, and the drying line evaporator 113 is connected to the return air pipeline 5.

[0015] The pressure raised gaseous heat pump working medium from the gas compressor 111 releases heat to the gas from the dryer 6 which removes part of the moisture through the drying line evaporator 113 through the drying line condenser 112, enters the drying line evaporator 113 to release cold energy, so that part of the moisture in the gas from the dryer 6 condenses into liquid water and is discharged, and the gaseous working medium from the drying line evaporator 113 returns to the gas compressor 111 for pressure increase, thereby forming a temperature increasing and dehumidifying circulation loop of the gaseous heat pump working medium.

[0016] At night or on cloudy days:

[0017] The gas from the dryer 6 removes part of the moisture through the drying line evaporator 113, and then absorbs heat through the drying line condenser 112, and then returns to the dryer 6 through the circulating fan 4 and the return air pipeline 5 to dry the goods, or the gas from the dryer 6 removes part of the moisture through the drying line evaporator 113, and then absorbs heat through the drying line condenser 112, and then is transported to the dryer 6 through the ventilator 13 to dry the goods, thereby forming a heat absorption and heat release circulation loop of the gas,

[0018] The pressure raised gaseous heat pump working medium from the gas compressor 111 releases heat to the gas from the dryer 6 which removes part of the moisture through the drying line evaporator 113 through the drying line condenser 112, enters the drying line evaporator 113 to release cold energy, so that part of the moisture in the gas from the dryer 6 condenses into liquid water and is discharged, and the gaseous working medium from the drying line evaporator 113 returns to the gas compressor 111 for pressure increase, thereby forming a temperature increasing and dehumidifying circulation loop of the gaseous heat pump working medium.

[0019] Provided with a heat storage heat exchanger 14:

[0020] The heat conducting oil from the heat conducting oil tank 1 is pressurized by the heat conducting oil pump 17, sent to the heat storage heat exchanger 14, and exchanged with the hot air sent from the solar hot air generator 7, so that the temperature of the heat conducting oil is increased, and the heat conducting oil returns to the heat conducting oil tank 1 through the heat storage heat conducting oil return pipeline 34, thereby forming a heat storage circulation loop of the heat conducting oil in the heat conducting oil tank 1,

[0021] The gas from the heat storage heat exchanger 14 returns to the solar hot air generator 7 through the circulating fan 4 and the return air pipeline 5, absorbs solar heat through the heat collecting pipe in the solar hot air generator 7, and then is transported to the heat storage heat exchanger 14, or the gas from the heat storage heat exchanger 14 returns to the solar hot air generator 7 through the return air pipeline 5, absorbs solar heat through the heat collecting pipe in the solar hot air generator 7, and then is 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.

[0022] At night or on cloudy days, the solar energy recovered by the solar heat blower 7 is not enough to supply the dryer 6, the heat conducting oil in the heat conducting oil tank 1 is pressurized by the heat conducting oil pump 17, and is sent to the heat storage heat exchanger 14 to exchange heat with the gas sent by the solar heat blower 7, and the heat conducting oil with reduced temperature returns to the heat conducting oil tank 1,

[0023] The gas sent by the solar heat blower 7 is heated by the heat storage heat exchanger 14 and then sent to the dryer 6 to dry the articles, and the gas from the dryer 6 returns to the solar heat blower 7 through the circulating fan 4 and the return air pipeline 5, is transported to the heat storage heat exchanger 14 through the heat collecting pipe in the solar heat blower 7, or the gas sent by the solar heat blower 7 is heated by the heat storage heat exchanger 14 and then sent to the dryer 6 to dry the articles, and the gas from the dryer 6 returns to the solar heat blower 7 through the return air pipeline 5, is transported to the heat storage heat exchanger 14 through the heat collecting pipe in the solar heat blower 7, and then is transported to the heat storage heat exchanger 14 through the circulating fan 13, thereby forming a heat release circulation loop of the heat storage heat conducting oil in the heat conducting oil tank 1 and a heat absorption and supply circulation loop of the gas.

[0024] An absorption refrigerator is arranged.

[0025] The absorption refrigerator is used to absorb the heat of the heat conducting oil and realize the refrigeration cycle process of the refrigerant, and comprises:

[0026] The generator 23, the condenser 24, the evaporator 25, the absorber 21 and the solution pump 22,

[0027] The heat conducting oil in the heat conducting oil tank 1 enters the heat conducting oil pump 17 to be pressurized, the pressurized heat conducting oil is transported to the generator 23 of the absorption refrigerator, the refrigerant pair concentrated solution in the generator 23 is heated, and then returns to the heat conducting oil tank 1 through the return flow heat conducting oil pipeline 33, thereby forming a heat supply circulation loop of the heat storage heat conducting oil in the heat conducting oil tank 1,

[0028] The high-temperature gaseous refrigerant 31 generated by heating the refrigerant pair concentrated solution in the generator 23 enters the evaporator 25 through the condenser 24 and the throttling valve F10, absorbs the heat of the cold carrier sent by the cold unit 27, and the low-temperature gaseous refrigerant 32 generated by evaporation in the evaporator 25 returns to the absorber 21, contacts with the refrigerant pair dilute solution formed in the generator 23 sent by the dilute solution adjusting valve F9, forms the refrigerant pair concentrated solution, and the refrigerant pair concentrated solution in the absorber 21 returns to the generator 23 through the solution pump 22, thereby forming a refrigerant circulation loop of the absorption refrigerator,

[0029] The cold carrier medium from the cold using unit 27 is pressurized by the cold carrier medium booster 28 and then sent to the evaporator 25 to absorb the cold released by the evaporation of the liquid refrigerant in the evaporator 25. The cold carrier medium absorbing the cold and decreasing in temperature is returned to the cold using unit 27 to provide cold, or the cold carrier medium from the cold using unit 27 is sent to the evaporator 25 to absorb the cold released by the evaporation of the liquid refrigerant in the evaporator 25. The cold carrier medium absorbing the cold and decreasing in temperature is pressurized by the cold carrier medium booster 28 and then returned to the cold using unit 27 to provide cold, thereby forming a cold carrier medium circulating loop for charging cold and providing cold to the cold using unit 27.

[0030] The cold using unit 27 can have various forms, such as a refrigeration air conditioning unit for an office in a drying system, a refrigeration pre-cooling unit in a drying system, and the like.

[0031] The cooling medium of the condenser 24 and the absorber 21 can be air, water, a water solution of sodium chloride, a water solution of ethylene glycol, or the like. For example, as shown in the accompanying drawings, the high-temperature gaseous refrigerant 31 in the condenser 24 is cooled by the cooling medium sent by the cooling medium booster 39, absorbs the heat of the high-temperature gaseous refrigerant 31, and forms high-temperature cooling medium which is discharged. Figure 1

[0032] The refrigerant in the absorber 21 absorbs the low-temperature gaseous refrigerant 32 from the dilute solution adjusting valve F9, forms a concentrated solution of the refrigerant, releases heat which is removed by the cooling medium sent by the cooling medium booster 39, and forms high-temperature cooling medium which is discharged.

[0033] When the cooling medium is air, the cooling medium booster 39 is a fan, and an open cycle is adopted. The air is sent into the condenser 24 and the absorber 21 by the cooling medium booster 39, absorbs the heat released when the high-temperature gaseous refrigerant 31 in the condenser 24 is condensed, absorbs the heat released when the refrigerant in the absorber 21 absorbs the low-temperature gaseous refrigerant 32 to form a concentrated solution of the refrigerant, and forms high-temperature absorber outlet cooling medium 41 and condenser outlet cooling medium 42 which are discharged.

[0034] When the cooling medium is a liquid, the cooling medium booster 39 is a liquid circulating pump. The cooling medium is sent into the condenser 24 and the absorber 21 by the cooling medium booster 39, absorbs the heat released when the high-temperature gaseous refrigerant 31 in the condenser 24 is condensed, absorbs the heat released when the refrigerant in the absorber 21 absorbs the low-temperature gaseous refrigerant 32 to form a concentrated solution of the refrigerant, forms high-temperature absorber outlet cooling medium 41 and condenser outlet cooling medium 42, and then enters a cooling tower 43 to be cooled and is returned to the cooling medium booster 39, thereby forming a cooling medium circulating loop. ​

[0035] The absorption cooler is selected with appropriate absorption cooler refrigerant pairs, including but not limited to ammonia-water, ammonia-sodium thiocyanate solution, refrigerant pairs provided by CN202210567342.6 (dimethyl ether-ionic liquid refrigerant), refrigerant pairs provided by CN202211615323.2 (R134a-DMETG solution), or refrigerant pairs provided by CN202310535508.0 (ammonia-ionic liquid refrigerant).

[0036] Heat exchanger 18 is provided:

[0037] The heat transfer oil in the heat transfer oil tank 1 is pressurized by the heat transfer oil pump 17. The pressurized heat transfer oil is then transported to the heat exchanger 18, where the working fluid 19 is heated to become the heating medium 20. The heat transfer oil exiting the heat exchanger 18 returns to the heat transfer oil tank 1, thus forming a heating circulation loop for the heat transfer oil stored in the heat transfer oil tank 1. For example, if the heat exchanger 18 serves as the organic working fluid evaporator of an organic Rankine cycle unit, the heat transfer oil passing through the heat exchanger 18 is the heat source for the organic working fluid evaporator. It is used to heat and vaporize the liquid organic working fluid delivered by the organic working fluid circulation pump to produce a high-temperature gaseous organic working fluid, which enters the organic working fluid turbine to drive the organic working fluid generator to generate electricity. The low-temperature, low-pressure organic working fluid vapor exiting the organic working fluid turbine enters the organic working fluid condenser to liquefy, and then returns to the organic working fluid circulation pump, thus forming an organic working fluid Rankine cycle loop.

[0038] The solar hot air heater 7 includes, but is not limited to, a through-type heat collector tube 10, a heat pipe, or a single-pass heat collector tube.

[0039] When the solar hot air heater 7 uses a through-type heat collector tube 10, the through-type heat collector tube 10 can be connected in series, parallel, or series-parallel configurations:

[0040] For example, attached Figure 1 As shown, multiple through-type heat collection pipes 10 are used in parallel, and two sets of solar hot air heaters 7 (double-box hot air heaters) are used in series. The solar hot air heater 7 includes a left box 8, a right box 9, and through-type heat collection pipes 10. Several through-type heat collection pipes 10 are arranged in parallel between the left box 8 and the right box 9. The through-type heat collection pipes 10 absorb the heat of solar energy and heat the gas entering the right box 9. The high-temperature gas generated is drawn out from the left box 8 and transported to the dryer 6 to dry Panax notoginseng, and then returns to the right box 9, thus forming a closed-loop gas circulation loop of the through-type heat collection pipe solar hot air heater 7. The hot air from the outlet of one set of solar hot air heaters 7 is used in series as the inlet gas of the other set of solar hot air heaters.

[0041] For example, attached Figure 1As shown, a plurality of through heat collecting pipes 10 are used in series, and two groups of solar hot air generators 7 (trough type hot air generators) are used in series. The solar hot air generator 7 includes a trough type heat collector 37, a light condensing plate 38 and the through heat collecting pipe 10. The gas enters the plurality of through heat collecting pipes 10 in series, the through heat collecting pipe 10 absorbs the heat of the sun to heat the entering gas, and the generated high-temperature gas is led out and used as the entering gas of another group of solar hot air generators.

[0042] Preferably, the through heat collecting pipe 10 adopts a vacuum heat collector, the inner layer of the heat collecting pipe is a stainless steel pipe, the outer layer is a glass pipe plus metal corrugated pipes at both ends, and the outer surface of the inner pipe is coated with a selective absorption coating to achieve maximum absorption of direct solar radiation and minimum infrared wave re-radiation.

[0043] A heat supplement device 46 is provided between the solar hot air generator 7 and the heat storage and heat exchange device 14. The heat supplement device 46 supplements the heat required by the dryer 6 and the heat conducting oil tank 1 by using electric heating, compressed air heat, fuel combustion heat, etc. For example, the heat supplement medium 47 adopts hot air 47 formed by natural gas combustion, enters the heat supplement device 46 to heat the air sent by the solar hot air generator 7, and the low-temperature flue gas formed is discharged as the exhaust heat supplement medium 48.

[0044] The circulating fan 4 is provided with an adjusting damper 3 for adjusting the air supply amount of the circulating fan 4.

[0045] The ventilator 13 is provided with a hot air adjusting damper 12 for adjusting the air supply amount of the ventilator 13.

[0046] The circulating fan 4 and the ventilator 13 are substantially the same, and the names are only used for distinction.

[0047] The circulating fan 4 or the ventilator 13 adopts a centrifugal type, axial type, screw type or vortex type fan.

[0048] The solar hot air generator 7 is provided with necessary support rods or support frames to safely, stably and effectively fix the solar hot air generator, so as to avoid overturning accidents caused by strong wind, etc.

[0049] The inlet pipeline of the heat conducting oil pump 17 is provided with a filter for filtering solid impurity particles in the inlet pipeline of the heat conducting oil.

[0050] The heat conducting oil tank 1 in the heat conducting oil system plays the roles of oil and gas separation, buffering, heat storage and storage, and needs to take heat preservation measures.

[0051] The heat conducting oil system is provided with necessary exhaust valves and safety valves.

[0052] The heat conducting oil tank 1 adopts a horizontal or vertical structure, and preferably a vertical structure to facilitate compact arrangement of the system.

[0053] The valve names in the application are only used for distinguishing, and some actual functions are the same.

[0054] The circulating fan 4 or the ventilator 13 adopts a variable frequency speed regulation operation mode, and when the sunshine and heat supply conditions change, the air supply amount and air supply pressure can be flexibly adjusted.

[0055] The absorption refrigerators of the system can adopt heat recovery, cold recovery, quality recovery and rectification measures.

[0056] The dust removal equipment can be set according to the needs, and is used for dust removal of circulating gas, for example, a bag type, a cyclone dust removal device with a bypass or an electric dust removal device.

[0057] The pipes, instruments, valves, regulating bypasses and the like not mentioned in the application are matched with the mature technologies in the known organic heat carrier boilers, solar water heating engineering and drying systems.

[0058] The parts not mentioned in the application, such as safety accessories, interlocking protection devices and automatic control, are matched with the existing known technologies.

[0059] Compared with the prior art, the utility model has the following advantages:

[0060] 1. Compared with the prior art, the application eliminates the problem of low heat utilization efficiency of the existing solar water heating system and photovoltaic utilization system, safely and efficiently recovers solar heat by using a solar hot air generator, stores heat in heat conducting oil, and near-constant pressure and high temperature heat conducting oil can be conveniently, flexibly and efficiently utilized by users during drying of the goods, continuous drying and long-period solar heat utilization are realized, and the heat water recovery system cannot be compared with the advantages; during a continuous rainy period, heat can be conveniently supplemented by a heat supplementing device to ensure smooth drying of the goods;

[0061] 2. Compared with the prior art, the application safely and efficiently recovers solar heat by using a solar hot air generator and stores heat in heat conducting oil, and the heat conducting oil is used to drive an absorption refrigerator to refrigerate and supply cold, which is used for low-temperature storage of goods, heat dissipation of an office data center, air conditioning of an office room and the like, and the user can conveniently, flexibly and efficiently utilize cold, and long-period continuous cold supply is realized.

[0062] 3. Compared with the prior art of the solar water heater directly heating water by using a heat collecting pipe, since gas passes through the heat collecting pipe, it is not easy to accumulate dust, the heat collecting pipe has high heat transfer efficiency, unlike the heat collecting pipe directly heating water, which is affected by scale, heat transfer effect and the like, and the heat collecting pipe is blocked, the maintenance cost is extremely low, and the operation period is greatly prolonged; in winter, unlike the heat collecting pipe directly heating water, which is blocked by ice in the water supply pipeline due to low temperature, cracks and water leakage at the connection between the heat collecting water tank and the heat collecting pipe and the like.

[0063] 4. Compared with the prior art, the heat exchanger heated by the heat conducting oil can conveniently supply heat to the outside or be used for solar organic Rankine cycle power generation, and the power supply capacity of the drying system in response to emergencies is improved;

[0064] 5. Compared with the prior art, the dehumidification and temperature increasing device in the application efficiently utilizes the heat pump technology to supply heat, and at the same time, the drying line evaporator in the heat pump working medium cycle is used to partially dehumidify the moisture in the gas at the outlet of the dryer, and then the drying line condenser is used to increase the temperature, effectively reducing the humidity of the gas entering the dryer and enhancing the drying capacity, and at the same time of dehumidification, the heat at the outlet of the dryer is directly recovered for heat pump heating, greatly improving the energy utilization rate;

[0065] 6. Compared with the prior art, the technical scheme of the application has flexible, diverse and efficient operation modes, for example, when the sunlight is abundant, the solar heat air dryer is directly used for heating and drying, and the heat accumulating heat conducting oil provides continuous drying energy, when the humidity of the gas at the outlet of the dryer is relatively large and affects the drying efficiency, the dehumidification and temperature increasing device is started to conveniently adjust the humidity of the circulating gas of the dryer to a suitable range; for example, high-quality organic vegetables are frozen and dried, the low-temperature freezing is first carried out in the cold absorption unit of the absorption refrigerator, the free water in the high-quality vegetables is frozen, expanded and solidified to form a skeleton, and then the dryer is used for low-temperature drying to remove the moisture (for example, 40 to 60 DEG C), the quality of the dehydrated vegetables is high, the preservation period is long, and the nutrients are easy to be absorbed and utilized;

[0066] 7. Compared with the prior art, the technical scheme of the application has strong versatility and is suitable for drying operations of various objects;

[0067] 8. Compared with the prior art, the technical scheme of the application has strong versatility and is suitable for drying operations of various objects, for example, inert gas such as nitrogen is used for drying operation, oxidation and deterioration of the dried objects are effectively avoided, low-temperature drying and high-temperature drying can be carried out, the drying temperature range is large, and the characteristics of the heat conducting oil of the application, such as low pressure and high temperature and strong heat accumulation capacity, can be fully utilized. BRIEF DESCRIPTION OF DRAWINGS

[0068] Figure 1 It is a drying system structure schematic view of the application.

[0069] Figure 1Medium: 1 - heat conducting oil tank, 2 - heat conducting oil tank gas space, 3 - adjusting damper, 4 - circulating fan, 5 - return air duct, 6 - dryer, 7 - solar heat air heater, 8 - left header, 9 - right header, 10 - through heat collecting tube, 11 - dehumidification and temperature increasing device, 111 - gas compressor, 112 - drying line condenser, 113 - drying line evaporator, 114 - water trap, 12 - hot air measuring and adjusting damper, 13 - ventilator, 14 - heat storage heat exchanger, 15 - hot air pipeline, 16 - pressure gauge, 17 - heat conducting oil pump, 18 - heat exchanger, 19 - heated medium, 20 - heat supply medium, 21 - absorber, 22 - solution pump, 23 - generator, 24 - condenser, 25 - evaporator, 26 - cold carrier medium pipeline, 27 - cold unit, 28 - cold carrier medium booster (when the cold carrier medium is liquid, it is a cold carrier medium circulating pump; when the cold carrier medium is gas, it is a cold carrier medium circulating fan), 29 - concentrated solution pipeline, 30 - dilute solution pipeline, 31 - high-temperature gaseous refrigerant, 32 - low-temperature gaseous refrigerant, 33 - return heat conducting oil pipeline, 34 - heat storage heat conducting oil return pipeline, 35 - heat storage hot air return pipeline, 36 - dryer outlet gas pipeline, 37 - trough type heat collector, 38 - light condensing plate, 39 - cooling medium booster (when the cooling medium is liquid, it is a cooling medium circulating pump; when the cooling medium is air, it is a blower), 40 - cooling medium, 41 - absorber outlet cooling medium, 42 - condenser outlet cooling medium, 43 - cooling tower, 44 - enhanced heat and moisture exchange element, 45 - cooling tower fan, 46 - heat supplement device, 47 - heat supplement medium, 48 - discharge heat supplement medium; F1 to F5, F7 to F20 are valves, wherein: F2 - discharge valve, F3 - safety valve, F4 - pressure gauge valve, F9 - dilute solution adjusting valve, F10 - throttling valve, F18 - exhaust valve, F19 - drying line throttling valve, F20 - water discharge valve, and the remaining valves are adjusting valves or stop valves. DETAILED DESCRIPTION

[0070] The present application will be further described in detail below in combination with the drawings and specific examples. Example 1

[0071] As shown in the accompanying drawings, Figure 1 A drying system comprises:

[0072] The solar heat air heater 7 recovers heat from solar energy,

[0073] The dryer 6 dries the articles in the dryer 6 by using hot gas,

[0074] The dehumidification and temperature increasing device 11 removes part of the water in the gas from the dryer 6 and then returns to the dryer 6,

[0075] The dehumidification and temperature increasing device 11 comprises a gas compressor 111, a drying line condenser 112, a drying line evaporator 113 and connecting pipes thereof,

[0076] The gas from the dryer 6 removes part of the water in the drying line evaporator 113, and then absorbs heat through the drying line condenser 112, and returns to the solar hot air generator 7 through the circulating fan 4 and the return air pipeline 5, absorbs solar heat through the heat collecting pipe in the solar hot air generator 7, and then is transported to the dryer 6 to dry the articles. The liquid water condensed from the drying line evaporator 113 is discharged into the water collector 114 through the drain valve F20, or the gas from the dryer 6 removes part of the water in the drying line evaporator 113, and then absorbs heat through the drying line condenser 112, and returns to the solar hot air generator 7 through the return air pipeline 5, absorbs solar heat through the heat collecting pipe in the solar hot air generator 7, and then is transported to the dryer 6 through the ventilator 13 to dry the articles. The liquid water condensed from the drying line evaporator 113 is discharged into the water collector 114 through the drain valve F20, thereby forming a solar heat recovery and heat release circulation loop of the gas,

[0077] The gaseous heat pump working medium from the gas compressor 111 releases heat to the gas from the dryer 6 which removes part of the water in the drying line evaporator 113 through the drying line condenser 112, and then enters the drying line evaporator 113 through the drying line throttling valve F19 to release cold energy, so that part of the water in the gas from the dryer 6 is condensed into liquid water. The gaseous heat pump working medium from the drying line evaporator 113 returns to the gas compressor 111 to increase the pressure and temperature, thereby forming a temperature increasing and dehumidification circulation loop of the gaseous working medium.

[0078] At night or on cloudy days:

[0079] The gas from the dryer 6 removes part of the water in the drying line evaporator 113, and then absorbs heat through the drying line condenser 112, and returns to the solar hot air generator 7 through the circulating fan 4 and the return air pipeline 5, absorbs solar heat through the heat collecting pipe in the solar hot air generator 7, and then is transported to the dryer 6 to dry the articles. The liquid water condensed from the drying line evaporator 113 is discharged into the water collector 114 through the drain valve F20, or the gas from the dryer 6 removes part of the water in the drying line evaporator 113, and then absorbs heat through the drying line condenser 112, and returns to the solar hot air generator 7 through the return air pipeline 5, absorbs solar heat through the heat collecting pipe in the solar hot air generator 7, and then is transported to the dryer 6 through the ventilator 13 to dry the articles. The liquid water condensed from the drying line evaporator 113 is discharged into the water collector 114 through the drain valve F20, thereby forming a solar heat recovery and heat release circulation loop of the gas,

[0080] The gas heat pump working medium with increased pressure from the gas compressor 111 releases heat to the gas from the dryer 6 which removes part of the moisture through the drying line evaporator 113 through the drying line condenser 112, enters the drying line evaporator 113 through the drying line condenser 112 to release cold energy, so that part of the moisture in the gas from the dryer 6 is condensed into liquid water and discharged, and the gaseous heat pump working medium from the drying line evaporator 113 returns to the gas compressor 111 to increase the pressure, thereby forming a temperature-increasing and dehumidifying circulation loop of the gaseous working medium.

[0081] The heat storage heat exchanger 14 is provided:

[0082] The heat conducting oil from the heat conducting oil tank 1 is pressurized by the heat conducting 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 generator 7, the temperature of the heat conducting oil is increased, and the heat conducting oil returns to the heat conducting oil tank 1 through the heat storage heat conducting oil return pipeline 34, thereby forming a heat storage circulation loop of the heat conducting oil in the heat conducting oil tank 1,

[0083] The gas from the heat storage heat exchanger 14 returns to the solar hot air generator 7 through the circulating fan 4 and the return air pipeline 5, absorbs solar heat through the heat collecting pipe in the solar hot air generator 7, and then is transported to the heat storage heat exchanger 14, or the gas from the heat storage heat exchanger 14 returns to the solar hot air generator 7 through the return air pipeline 5, absorbs solar heat through the heat collecting pipe in the solar hot air generator 7, and then is 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.

[0084] At night or on cloudy days: the solar energy recovered by the solar hot air generator 7 is not enough to supply the dryer 6, the heat conducting oil in the heat conducting oil tank 1 is pressurized by the heat conducting oil pump 17 and sent to the heat storage heat exchanger 14 to exchange heat with the gas sent by the solar hot air generator 7, the temperature of the heat conducting oil is reduced, and the heat conducting oil returns to the heat conducting oil tank 1,

[0085] The gas sent by the solar hot air generator 7 is heated by the heat storage heat exchanger 14 and then sent to the dryer 6 through the valve F17 to dry the goods, the gas from the dryer 6 returns to the solar hot air generator 7 through the drying line evaporator 113, the drying line condenser 112, the circulating fan 4 and the return air pipeline 5, and then is transported to the heat storage heat exchanger 14 through the heat collecting pipe in the solar hot air generator 7, or the gas sent by the solar hot air generator 7 is heated by the heat storage heat exchanger 14 and then sent to the dryer 6 to dry the goods, the gas from the dryer 6 returns to the solar hot air generator 7 through the drying line evaporator 113, the drying line condenser 112 and the return air pipeline 5, and then is transported to the heat storage heat exchanger 14 through the heat collecting pipe in the solar hot air generator 7 and the ventilator 13, thereby forming a heat release circulation loop of the heat storage heat conducting oil in the heat conducting oil tank 1 and a heat absorption and supply circulation loop of the gas.

[0086] An absorption refrigerator is provided:

[0087] The absorption refrigerator is used to absorb the heat of the heat conducting oil, realize the refrigeration cycle process of the refrigerant, comprising:

[0088] The generator 23, the condenser 24, the evaporator 25, the absorber 21 and the solution pump 22,

[0089] The heat conducting oil tank 1 enters the heat conducting oil pump 17 to increase the pressure, and the pressurized heat conducting oil is delivered to the generator 23 of the absorption refrigerator to heat the refrigerant pair concentrated solution in the generator 23, and then returns to the heat conducting oil tank 1 through the backflow heat conducting oil pipeline 33, thereby forming a heat supply circulation loop of the heat storage heat conducting oil in the heat conducting oil tank 1,

[0090] The high-temperature gaseous refrigerant 31 generated by heating the refrigerant pair concentrated solution in the generator 23 by the heat conducting oil enters the evaporator 25 through the condenser 24 and the throttling valve F10, absorbs the heat of the cold carrier delivered by the cold unit 27, and the evaporator 25 evaporates to generate low-temperature gaseous refrigerant 32 back to the absorber 21, which contacts the refrigerant pair dilute solution formed in the generator 23 delivered from the dilute solution adjusting valve F9, forms the refrigerant pair concentrated solution, and the refrigerant pair concentrated solution in the absorber 21 returns to the generator 23 through the solution pump 22, thereby forming a refrigerant circulation loop of the absorption refrigerator,

[0091] The cold carrier medium from the cold unit 27 is pressurized by the cold carrier medium booster 28 and delivered to the evaporator 25 to absorb the cold energy released by the evaporation of the liquid refrigerant in the evaporator 25, and the cold carrier medium which absorbs the cold energy and reduces the temperature returns to the cold unit 27 for cooling supply, or the cold carrier medium from the cold unit 27 enters the evaporator 25 to absorb the cold energy released by the evaporation of the liquid refrigerant in the evaporator 25, and the cold carrier medium which absorbs the cold energy and reduces the temperature is pressurized by the cold carrier booster 28 and returns to the cold unit 27 for cooling supply, thereby forming a cold carrier medium circulation loop of the cold carrier medium which is cooled and re-cooled to the cold unit 27.

[0092] The cold unit 27 has various types of use, which refers to the cooling place in the drying system, such as the refrigeration air conditioning unit required by the office place, the refrigeration pre-cooling unit in the drying system, etc.

[0093] The cooling medium of the condenser 24 and the absorber 21 uses air, water, sodium chloride aqueous solution or ethylene glycol aqueous solution, etc., as shown in the accompanying drawings, Figure 1 The cooling medium delivered by the cooling medium booster 39 in the condenser 24 cools the high-temperature gaseous refrigerant 31, absorbs the heat of the high-temperature gaseous refrigerant 31, and the high-temperature cooling medium formed is discharged, and the high-temperature gaseous refrigerant 31 is condensed to form liquid refrigerant delivered to the evaporator 25,

[0094] The refrigerant pair dilute solution from the dilute solution regulating valve F9 absorbs the low-temperature gaseous refrigerant 32 in the absorber 21 to form a refrigerant pair concentrated solution, and the released heat is removed by the cooling medium sent by the cooling medium booster 39 to form a high-temperature cooling medium outlet 41, 42.

[0095] When the cooling medium is air, the cooling medium booster 39 is a fan, and an open cycle mode is adopted. The air is sent into the condenser 24 and the absorber 21 by the cooling medium booster 39 to absorb the heat released when the high-temperature gaseous refrigerant 31 in the condenser 24 is condensed and the heat released when the refrigerant pair dilute solution in the absorber 21 absorbs the low-temperature gaseous refrigerant 32 to form a refrigerant pair concentrated solution, and the formed high-temperature absorber outlet cooling medium 41 and condenser outlet cooling medium 42 are discharged.

[0096] When the cooling medium is liquid, the cooling medium booster 39 is a liquid circulating pump. The cooling medium is sent into the condenser 24 and the absorber 21 by the cooling medium booster 39 to absorb the heat released when the high-temperature gaseous refrigerant 31 in the condenser 24 is condensed and the heat released when the refrigerant pair dilute solution in the absorber 21 absorbs the low-temperature gaseous refrigerant 32 to form a refrigerant pair concentrated solution, and the formed high-temperature absorber outlet cooling medium 41 and condenser outlet cooling medium 42 enter the cooling tower 43 for cooling and then return to the cooling medium booster 39, thereby forming a cooling medium circulating loop.

[0097] The absorption refrigeration device selects an ammonia-water refrigerant pair.

[0098] The heat exchanger 18 is provided.

[0099] The heat transfer oil in the heat transfer oil tank 1 enters the heat transfer oil pump 17 to be pressurized, and the pressurized heat transfer oil is delivered into the heat exchanger 18 to heat the heat medium 19 into a heating medium 20. The heat transfer oil returning from the heat exchanger 18 returns to the heat transfer oil tank 1, thereby forming a heating circulating loop of the heat storage heat transfer oil in the heat transfer oil tank 1. For example, the heat exchanger 18 is used as an organic Rankine cycle unit evaporator. At this time, the heat transfer oil passing through the heat exchanger 18 is the heat source of the organic Rankine cycle unit evaporator, which is used to heat and vaporize the liquid organic working medium delivered by the organic working medium circulating pump to generate high-temperature gaseous organic working medium, which enters the organic working medium turbine to drive the organic working medium generator to generate electricity. The low-temperature and low-pressure organic working medium vapor from the organic working medium turbine enters the organic working medium condenser to be liquefied, and then returns to the organic working medium circulating pump, thereby forming an organic Rankine cycle loop.

[0100] The heat collecting pipe of the solar hot air generator 7 adopts a through heat collecting pipe 10.

[0101] For example, the heat collecting pipe 10 is a double-walled heat collecting pipe. Figure 1As shown, a plurality of through heat collecting pipes 10 are used in parallel, and two groups of solar hot air generators 7 (double-union-box hot air generators) are used in series. The solar hot air generator 7 comprises a left union box 8, a right union box 9, and a through heat collecting pipe 10. A plurality of through heat collecting pipes 10 are arranged in parallel between the left union box 8 and the right union box 9. The through heat collecting pipe 10 absorbs heat of the sun, heats the gas entering the right union box 9, and generates high-temperature gas which is led out of the left union box 8 and transported to the dryer 6 to dry the ginseng, and then returns to the right union box 9, thereby forming a gas closed-loop circulation loop of the through heat collecting pipe type solar hot air generator 7. The outlet hot air of one group of solar hot air generators 7 is used as the inlet gas of another group of solar hot air generators.

[0102] For example, the through heat collecting pipe 10 is a vacuum heat collector, the inner layer of the heat collecting pipe is a stainless steel pipe, the outer layer is a glass pipe plus metal corrugated pipes at both ends, and the outer surface of the inner pipe is coated with a selective absorption coating to achieve maximum absorption of direct solar radiation and minimum infrared wave re-radiation. Figure 1 As shown, a plurality of through heat collecting pipes 10 are used in parallel, and two groups of solar hot air generators 7 (double-union-box hot air generators) are used in series. The solar hot air generator 7 comprises a left union box 8, a right union box 9, and a through heat collecting pipe 10. A plurality of through heat collecting pipes 10 are arranged in parallel between the left union box 8 and the right union box 9. The through heat collecting pipe 10 absorbs heat of the sun, heats the gas entering the right union box 9, and generates high-temperature gas which is led out of the left union box 8 and transported to the dryer 6 to dry the ginseng, and then returns to the right union box 9, thereby forming a gas closed-loop circulation loop of the through heat collecting pipe type solar hot air generator 7. The outlet hot air of one group of solar hot air generators 7 is used as the inlet gas of another group of solar hot air generators.

[0103] Preferably, the through heat collecting pipe 10 is a vacuum heat collector, the inner layer of the heat collecting pipe is a stainless steel pipe, the outer layer is a glass pipe plus metal corrugated pipes at both ends, and the outer surface of the inner pipe is coated with a selective absorption coating to achieve maximum absorption of direct solar radiation and minimum infrared wave re-radiation.

[0104] A heat supplement device 46 is provided between the solar hot air generator 7 and the heat storage and heat exchanger 14. The heat supplement device 46 supplements the heat required by the dryer 6 and the heat conducting oil tank 1 by using electric heating, compressed air heat, fuel combustion heat, etc. For example, the heat supplement medium 47 is hot air formed by natural gas combustion, which enters the heat supplement device 46 to heat the air sent by the solar hot air generator 7, and the low-temperature flue gas formed is discharged as the exhaust heat supplement medium 48.

[0105] The circulating fan 4 is provided with an adjusting damper 3 for adjusting the air supply amount of the circulating fan 4.

[0106] The ventilator 13 is provided with a hot air adjusting damper 12 for adjusting the air supply amount of the ventilator 13.

[0107] The circulating fan 4 and the ventilator 13 are substantially the same, and the names are only used for distinction.

[0108] The circulating fan 4 or the ventilator 13 is a centrifugal fan, an axial fan, a screw fan, or a vortex fan.

[0109] The solar hot air generator 7 is provided with necessary support rods or support frames to safely, stably, and effectively fix the solar hot air generator, so as to avoid tipping accidents caused by strong winds, etc.

[0110] The inlet pipeline of the heat conducting oil pump 17 is provided with a filter for filtering solid impurity particles in the heat conducting oil in the inlet pipeline.

[0111] The heat conducting oil tank 1 in the heat conducting oil system plays the roles of oil gas separation, buffering, heat storage and storage, and needs to take insulation measures.

[0112] The heat conducting oil system is provided with necessary exhaust valves and safety valves.

[0113] The heat conducting oil tank 1 adopts a horizontal or vertical structure, preferably a vertical structure, which facilitates compact arrangement of the system.

[0114] The valve names in the application are only used for differentiation, and some actual functions are the same.

[0115] The circulating fan 4 or the ventilator 13 adopts a variable frequency speed regulation operation mode, and when the sunlight and heat supply conditions change, the air supply amount and air supply pressure can be flexibly adjusted.

[0116] The absorption type refrigerators of the system can adopt heat recovery, cold recovery, quality recovery, rectification and other measures.

[0117] The utility model can set corresponding dust removal equipment according to needs, which is used for dust removal of circulating gas, for example, adopts cloth bag type, cyclone dust removal or electric dust removal equipment with bypass.

[0118] The pipelines, instruments, valves, regulating bypasses and the like not mentioned in the application are matched with the mature technologies in the known organic heat carrier boilers, solar water heating engineering and drying systems.

[0119] The parts not mentioned in the application, such as safety accessories, interlocking protection devices and automatic control, are matched with the existing known technologies.

[0120] Although the utility model has disclosed as above with preferred embodiments, they are not used to limit the utility model, and any person skilled in the art can make various changes or decorations without departing from the spirit and scope of the utility model, which also belongs to the protection scope of the utility model. Therefore, the protection scope of the utility model should be defined by the claims of the application.

Claims

1. A drying system, characterized by, It comprises: a solar heat exchanger (7) for heat recovery of solar energy, a dryer (6) for drying articles in the dryer (6) by hot gas, a dehumidification and temperature increasing device (11) for removing part of the water in the gas from the dryer (6) and increasing the temperature of the gas, the dehumidification and temperature increasing device (11) comprises a gas compressor (111), a drying line condenser (112), a drying line evaporator (113) and connecting pipes, the gas from the dryer (6) is returned to the solar heat exchanger (7) through a circulating fan (4) and a return air pipe (5), and then is sent to the dryer (6) to dry the articles after absorbing solar heat in the heat collecting pipe of the solar heat exchanger (7), or the gas from the dryer (6) is returned to the solar heat exchanger (7) through the return air pipe (5), and then is sent to the dryer (6) to dry the articles after absorbing solar heat in the heat collecting pipe of the solar heat exchanger (7) and then being transported to the dryer (6) by a ventilator (13), thereby forming a solar heat recovery and heat release circulation loop of the gas, or the gas from the dryer (6) removes part of the water through the drying line evaporator (113), and then is returned to the solar heat exchanger (7) through the circulating fan (4) and the return air pipe (5) after absorbing heat through the drying line condenser (112), and then is sent to the dryer (6) to dry the articles after absorbing solar heat in the heat collecting pipe of the solar heat exchanger (7), or the gas from the dryer (6) removes part of the water through the drying line evaporator (113), and then is returned to the solar heat exchanger (7) through the return air pipe (5) after absorbing heat through the drying line condenser (112), and then is sent to the dryer (6) to dry the articles after absorbing solar heat in the heat collecting pipe of the solar heat exchanger (7) and then being transported to the dryer (6) by the ventilator (13), thereby forming a solar heat recovery and heat release circulation loop of the gas, the gaseous heat pump working medium from the gas compressor (111) releases heat to the gas from the dryer (6) that removes part of the water through the drying line evaporator (113) through the drying line condenser (112), and then enters the drying line evaporator (113) to release cold energy, so that part of the water in the gas from the dryer (6) condenses into liquid water, and the gaseous heat pump working medium from the drying line evaporator (113) returns to the gas compressor (111) to increase the pressure, thereby forming a temperature increasing and dehumidification circulation loop of the gaseous working medium.

2. The drying system according to claim 1, wherein at night or on cloudy days: the gas from the dryer (6) removes part of the water through the drying line evaporator (113), and then is returned to the dryer (6) to dry the articles after absorbing heat through the drying line condenser (112) through the circulating fan (4) and the return air pipe (5), or the gas from the dryer (6) removes part of the water through the drying line evaporator (113), and then is transported to the dryer (6) to dry the articles after absorbing heat through the drying line condenser (112) through the ventilator (13), thereby forming a heat absorption and heat release circulation loop of the gas, The pressure raised gaseous heat pump working medium from the gas compressor (111) releases heat to the gas from the dryer (6) which removes part of the moisture through the drying line evaporator (113) through the drying line condenser (112), enters the drying line evaporator (113) through the drying line condenser (112) to release cold, so that part of the moisture in the gas from the dryer (6) condenses into liquid water and is discharged, and the gaseous heat pump working medium from the drying line evaporator (113) returns to the gas compressor (111) for pressure increase, thereby forming a temperature increasing and dehumidifying circulation loop of the gaseous working medium.

3. The drying system according to claim 1, wherein a heat storage heat exchanger (14) is provided. The heat conducting oil from the heat conducting oil tank (1) is pressurized by the heat conducting 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 generator (7), so that the temperature of the heat conducting oil is raised, and the heat conducting oil returns to the heat conducting oil tank (1) through the heat storage heat conducting oil return pipeline (34), thereby forming a heat storage circulation loop of the heat conducting oil in the heat conducting oil tank (1), The gas from the heat storage heat exchanger (14) returns to the solar hot air generator (7) through the circulating fan (4) and the return air pipeline (5), is heated by the heat collecting pipe in the solar hot air generator (7), and is then sent to the heat storage heat exchanger (14), or the gas from the heat storage heat exchanger (14) returns to the solar hot air generator (7) through the return air pipeline (5), is heated by the heat collecting pipe in the solar hot air generator (7), and is then sent 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.

4. The drying system according to claim 3, wherein at night or on cloudy days, the solar energy recovered by the solar hot air generator (7) is not enough to supply the dryer (6), the heat conducting oil in the heat conducting oil tank (1) is pressurized by the heat conducting oil pump (17) and sent to the heat storage heat exchanger (14) to exchange heat with the gas sent by the solar hot air generator (7), and the heat conducting oil with reduced temperature returns to the heat conducting oil tank (1), The gas sent by the solar hot air generator (7) is heated by the heat storage heat exchanger (14) and then sent to the dryer (6) to dry the articles, and the gas from the dryer (6) returns to the solar hot air generator (7) through the circulating fan (4) and the return air pipeline (5), is heated by the heat collecting pipe in the solar hot air generator (7), and is then sent to the heat storage heat exchanger (14), or the gas sent by the solar hot air generator (7) is heated by the heat storage heat exchanger (14) and then sent to the dryer (6) to dry the articles, and the gas from the dryer (6) returns to the solar hot air generator (7) through the return air pipeline (5), is heated by the heat collecting pipe in the solar hot air generator (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 heat conducting oil in the heat conducting oil tank (1) and a heat absorption and supply circulation loop of the gas.

5. The drying system according to claim 3, wherein ​ ​ Absorption refrigerators are provided for absorbing heat of heat conducting oil, realizing refrigeration cycle of refrigeration working medium, comprising: Generator (23), condenser (24), evaporator (25), absorber (21) and solution pump (22), The heat conducting oil tank (1) of the heat conducting oil into the heat conducting oil pump (17) pressure rise, the pressure rise of the heat conducting oil is transported to the generator (23), the refrigeration working medium in the generator (23) is heated to the concentrated solution, then returns to the heat conducting oil tank (1) through the backflow heat conducting oil pipeline (33), thereby forming the heat supply circulation loop of the heat storage heat conducting oil in the heat conducting oil tank (1), The high-temperature gaseous refrigerant (31) generated by heating the refrigeration working medium pair concentrated solution in the generator (23) through the heat conducting oil enters the evaporator (25) through the condenser (24) and the throttling valve F10, absorbs the heat of the cold carrier medium sent by the cold unit (27), the low-temperature gaseous refrigerant (32) generated by the evaporator (25) returns to the absorber (21), contacts with the refrigeration working medium pair dilute solution formed in the generator (23) sent by the dilute solution adjusting valve F9, forms the refrigeration working medium pair concentrated solution, and the refrigeration working medium pair concentrated solution in the absorber (21) returns to the generator (23) through the solution pump (22), thereby forming the refrigeration working medium cycle loop of the absorption refrigerators, The cold carrier medium from the cold unit (27) is pressurized by the cold carrier medium booster (28) and then sent to the evaporator (25) to absorb the cold energy released by the liquid refrigeration working medium in the evaporator (25), and the cold carrier medium absorbing the cold energy and reducing the temperature returns to the cold unit (27) for cooling supply, or the cold carrier medium from the cold unit (27) enters the evaporator (25) to absorb the cold energy released by the liquid refrigeration working medium in the evaporator (25), and the cold carrier medium absorbing the cold energy and reducing the temperature is pressurized by the cold carrier medium booster (28) and then returns to the cold unit (27) for cooling supply, thereby forming the cold carrier medium cycle loop of the cold carrier medium for cooling and re-cooling supply to the cold unit (27).

6. The drying system according to claim 3, wherein a heat exchanger (18) is provided, The heat conducting oil tank (1) of the heat conducting oil into the heat conducting oil pump (17) pressure rise, the pressure rise of the heat conducting oil is transported to the generator (23), the refrigeration working medium in the generator (23) is heated to the concentrated solution, then returns to the heat conducting oil tank (1) through the backflow heat conducting oil pipeline (33), thereby forming the heat supply circulation loop of the heat storage heat conducting oil in the heat conducting oil tank (1), 7. The drying system according to claim 3, wherein a heat supplement device (46) is provided between the solar heat air dryer (7) and the heat storage heat exchanger (14), which uses electric heating, compressed air heating, fuel combustion heating to supplement the heat required by the dryer (6) and / or the heat conducting oil tank (1).

8. The drying system according to claim 1, wherein the heat collecting pipe of the solar heat air dryer (7) comprises a through heat collecting pipe (10), a heat pipe or a single-through heat collecting pipe.

9. The drying system according to claim 5, wherein ​ ​ ​ The selected refrigeration working pairs of the absorption refrigerator include ammonia-water, ammonia-sodium thiocyanate solution, dimethyl ether-ion liquid working pair, R134a-DMETG solution or ammonia-ion liquid working pair.

10. The drying system of claim 8, wherein, The heat collecting tube adopts a vacuum heat collector, the inner layer of the heat collecting tube is a stainless steel tube, the outer layer is a glass tube, and the outer surface of the inner tube is coated with a selective absorption coating.

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