Agricultural and sideline product drying system and method based on wind energy direct drive and solar light heat complementation suitable for dry areas

Abstract

A kind of agricultural and sideline products drying system and method based on wind energy direct drive and solar light heat complementation suitable for dry area belong to new energy drying technical field.Solve the problem that wind energy and solar energy cannot be deeply cooperated in prior art.Technical points: when wind is sufficient, directly drive first fan, realize efficient drying;Solar energy collector absorbs solar energy, heats internal working medium, stores it in heat storage water tank;When ambient temperature is low and air humidity is large, start solar energy collector;When wind is weakened or there is no wind, clutch switches, power grid supplies power to motor, drives first fan and circulating water pump to continue to run;When normal temperature drying air flow flows through air duct, exchanges heat with internal working medium of heat exchanger;Natural wind simultaneously drives second wind turbine to rotate, drives exhaust fan and air induction fan to continue to work.The present application improves overall energy utilization efficiency of system from source, significantly reduces energy consumption per unit output;Improve technical economy and market promotion feasibility.

Description

Technical Field

[0001] This invention relates to the field of new energy drying technology, specifically to a drying system and method for agricultural and sideline products based on wind power direct drive and solar thermal complementarity, suitable for dry areas. Background Technology

[0002] Drying agricultural and sideline products is a crucial step in agricultural production and food processing, directly impacting their shelf life and economic value. Currently, most production areas in my country still widely employ traditional drying methods such as coal-fired or electric heating, resulting in high energy consumption and significant carbon emissions. In arid and semi-arid regions with abundant wind energy resources, ample solar radiation, and low air humidity, utilizing clean and renewable energy for drying has become a development direction with significant environmental and economic benefits. An ideal drying system should achieve continuous, stable, and controllable drying operations while simplifying the energy conversion path as much as possible.

[0003] In the field of wind or solar drying, several technical solutions have attempted to improve system continuity and energy efficiency through multi-energy coupling, but problems still exist: An existing patent for a wind-solar hybrid power-supplying forage drying system integrates photovoltaic power generation, wind power generation, two independent solar collectors (one for heating air and one for heating water), and a complex heat exchange and energy storage system. This solution has a large structure and complex energy flow. Its fundamental logic is still to first convert wind and solar resources into electricity for storage and distribution, and then drive various energy-consuming devices. Energy conversion and transmission losses accumulate significantly. Furthermore, the solar collectors, as independent heat sources, lack a direct synergistic and complementary mechanism with the wind power system. Another existing patent for a wind-solar hybrid column-type energy-saving drying system uses a vertical axis wind turbine generator to power the system, supplemented by a separate... The existing solar collector provides heat. Although this scheme utilizes both wind and solar energy, the wind energy portion still needs to go through a conversion chain of "wind energy - mechanical energy - electrical energy - mechanical energy (wind turbine)" to power the drying system. There are significant efficiency losses in the generator and motor during this process. The solar energy utilization part is an independent heat collection system and is not deeply integrated with the wind power system in terms of energy flow. An existing patent for a solar-wind complementary heat pump drying and heating system combines solar photovoltaic and wind power generation. The electrical energy is stored in a battery to drive the heat pump system to achieve drying and heating. Its energy path is "wind and solar resources - electrical energy - battery - heat pump (electrical energy - thermal energy)," which involves multiple energy form conversions, resulting in significant conversion losses. In addition, the system relies on the heat pump, has a complex structure, and has high initial investment and maintenance costs.

[0004] In summary, existing drying technologies using wind or solar energy still generally suffer from the following shortcomings: First, the system structure is complex, and multiple energy conversions lead to efficiency degradation. Most systems rely on indirect paths of converting both wind and solar energy into electricity for reuse, failing to fully utilize the natural advantages of wind energy being directly converted into mechanical work and solar energy being directly provided with heat. Second, wind energy utilization efficiency is low, mostly following multiple conversions of "wind energy - mechanical energy - electrical energy - mechanical energy / thermal energy," resulting in significant losses. Third, wind-solar hybrid systems require the energy to be converted into electrical energy for storage and distribution, resulting in complex supporting units, batteries, inverters, and electrical control equipment, leading to high initial investment and operation and maintenance costs.

[0005] Therefore, there is an urgent need to propose a drying system and method for agricultural and sideline products based on direct wind power and solar thermal complementarity suitable for arid regions, in order to solve the problem that existing technologies cannot deeply coordinate wind power and solar energy. Summary of the Invention

[0006] In view of the above facts, in order to solve the problem that the prior art cannot deeply coordinate wind energy and solar energy, the present invention designs an agricultural and sideline product drying system and method based on direct wind power and solar thermal complementarity suitable for dry areas.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] Option 1: A drying system for agricultural and sideline products based on wind power direct drive and solar thermal complementarity suitable for arid areas, including a first wind turbine, a first gearbox, a first fan, a drying box, an exhaust fan, a second gearbox, a second wind turbine, a third gearbox, an induced draft fan, an air outlet, a heat exchanger, a circulating water pump, a solar collector, a fourth gearbox, an electric motor, a clutch, and a hot water storage tank.

[0009] The first output shaft of the first wind turbine is connected to the clutch, the electric motor is driven by the grid, the second output shaft of the motor is connected to the clutch, the third output shaft of the clutch is connected to both the first gearbox and the fourth gearbox, the fourth output shaft of the first gearbox is connected to the first fan, the air outlet of the first fan is connected to the air inlet of the drying box through the air duct, the dehumidification fan is set at the dehumidification port of the drying box, and the induced draft fan is set at the air outlet of the drying box. The fifth output shaft of the second wind turbine is connected to both the second gearbox and the third gearbox, the sixth output shaft of the second gearbox is connected to the dehumidification fan, and the seventh output shaft of the third gearbox is connected to the induced draft fan.

[0010] The eighth output shaft of the fourth gearbox is connected to the circulating water pump, the solar collector is connected to the hot water storage tank, the heat exchanger is installed on the air duct of the first fan, and the hot water storage tank is connected to the heat exchanger through the circulating water pump to form a closed fluid circulation loop.

[0011] Furthermore: the first wind turbine is a horizontal axis wind turbine, the second wind turbine is a vertical axis wind turbine, and the second wind turbine adopts a drag-type or lift-type blade structure.

[0012] Furthermore, the drying chamber is equipped with several exhaust fans, which are evenly distributed along the airflow direction on the top of the drying chamber.

[0013] Furthermore, the rotational speeds of the first fan, the exhaust fan, and the induced draft fan are independently adjusted via the first gearbox, the second gearbox, and the third gearbox, respectively.

[0014] Option 2: The method for drying agricultural and sideline products in arid regions based on wind-driven direct-drive and solar-thermal complementary systems, as described in Option 1, is implemented using the agricultural and sideline product drying system for arid regions based on wind-driven direct-drive and solar-thermal complementary systems, specifically as follows:

[0015] Step 1: When there is sufficient wind, the first fan is directly driven by the first wind turbine to achieve efficient drying;

[0016] Step 2: The solar collector absorbs solar energy to heat the internal working fluid, which is then stored in a hot water storage tank.

[0017] Step 3: When the ambient temperature is low and the air humidity is high, start the solar collector. The first wind turbine drives the circulating water pump to run, driving the internal working fluid to flow through the heat exchanger.

[0018] Step 4: When the wind weakens or there is no wind, the clutch switches, the power grid supplies power to the motor, the motor connects to the clutch, and provides power to the first gearbox and the fourth gearbox. After the power is adjusted, it drives the first fan and the circulating water pump to continue to operate.

[0019] Step 5: When the ambient temperature dry airflow sent in by the third fan flows through the air duct, it exchanges heat with the internal working fluid of the heat exchanger.

[0020] Step Six: The heated, room-temperature dry airflow enters the drying chamber to dry the material;

[0021] Step 7: Natural wind simultaneously drives the second fan to rotate. The power is adjusted by the second and third gearboxes respectively, and then drives the exhaust fan and the induced draft fan. The exhaust fan actively extracts the high humidity air generated by the evaporation of materials in the drying chamber, and the induced draft fan provides suction at the exhaust end. The two work together to form a unidirectional, forced airflow field inside the drying chamber, accelerating the removal of moisture.

[0022] The beneficial effects of this invention are as follows:

[0023] 1. This invention abandons the lengthy path of converting all wind energy into electrical energy for reuse. Instead, it uses a direct "wind energy-mechanical energy" transmission method to drive the fan to rotate, while using solar energy directly as "light energy-thermal energy" for auxiliary heating. This dual-path design completely avoids the multiple conversion losses caused by the "power generation-storage-consumption" links in traditional wind-solar hybrid systems, improving the overall energy utilization efficiency of the system from the source and significantly reducing energy consumption per unit output.

[0024] 2. This invention achieves efficient utilization and conversion of wind energy at the architectural level. While ensuring the continuous and stable operation of drying, it simplifies the system structure, further improves the overall energy efficiency and operational reliability of the system, significantly reduces the initial investment cost of equipment and the difficulty and cost of subsequent operation and maintenance, and enhances the technical economy and market promotion feasibility.

[0025] 3. This invention deeply integrates efficient but unstable wind power direct drive with stable but diurnal-dependent solar thermal utilization, constructing an inherently complementary and structurally simple energy supply mechanism. During windy days, the system operates in the most efficient direct drive mode. During periods of low ambient temperature and high humidity, solar energy is used for real-time heat collection to maintain or enhance the necessary temperature and airflow circulation within the drying chamber. This design effectively overcomes the limitations of a single wind-driven system affected by intermittent weather conditions, significantly enhancing the continuity and stability of drying operations under variable climatic conditions. Furthermore, since the auxiliary heat comes from solar energy, it avoids the use of electric heating or coal combustion, making the system highly environmentally friendly.

[0026] 4. This invention uses an independently driven dehumidifying fan and an induced draft fan to work together to form a stable negative pressure airflow organization in the drying chamber, effectively avoiding moisture retention and local dead zones, thereby improving the uniformity and overall efficiency of drying. The second gearbox speed regulation design allows the dehumidifying fan to adapt to changes in natural wind speed, ensuring a continuous and stable dehumidification process. Attached Figure Description

[0027] Figure 1 This is a general structural diagram of the present invention;

[0028] Figure 2 This is a top view of the dehumidifying fan of the present invention.

[0029] In the diagram: 1-First wind turbine, 2-First gearbox, 3-First fan, 4-Drying box, 5-Exhaust fan, 6-Second gearbox, 7-Second wind turbine, 8-Third gearbox, 9-Exhaust fan, 10-Air outlet, 11-First output shaft, 12-Fourth output shaft, 13-Sixth output shaft, 14-Seventh output shaft, 15-Fifth output shaft, 16-Heat exchanger, 17-Circulating water pump, 18-Solar collector, 19-Fourth gearbox, 20-Eighth output shaft, 21-Motor, 22-Clutch, 23-Second output shaft, 24-Third output shaft, 25-Hot water storage tank. Detailed Implementation

[0030] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0031] The terms "set up," "connect," and "fix" should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection, a direct connection, or an indirect connection through an intermediate medium, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0032] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0033] Preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0034] Example 1: This example describes an agricultural and sideline product drying system based on wind power direct drive and solar thermal complementarity suitable for dry areas. It includes a first wind turbine 1, a first gearbox 2, a first fan 3, a drying box 4, an exhaust fan 5, a second gearbox 6, a second wind turbine 7, a third gearbox 8, an exhaust fan 9, an air outlet 10, a heat exchanger 16, a circulating water pump 17, a solar collector 18, a fourth gearbox 19, an electric motor 21, a clutch 22, and a hot water storage tank 25.

[0035] The first output shaft 11 of the first wind turbine 1 is connected to the clutch 22, and the grid drives the motor 21. The second output shaft 23 of the motor 21 is connected to the clutch 22. The third output shaft 24 of the clutch 22 is connected to both the first gearbox 2 and the fourth gearbox 19. The fourth output shaft 12 of the first gearbox 2 is connected to the first fan 3, driving the first fan 3 to rotate. The air outlet of the first fan 3 is connected to the air inlet of the drying box 4 through the air duct. The dehumidification fan 5 is located at the dehumidification port of the drying box 4. The induced draft fan 9 is located at the air outlet 10 of the drying box 4. The fifth output shaft 15 of the second wind turbine 7 is connected to both the second gearbox 6 and the third gearbox 8. The sixth output shaft 13 of the second gearbox 6 is connected to the dehumidification fan 5. The seventh output shaft 14 of the third gearbox 8 is connected to the induced draft fan 9.

[0036] The eighth output shaft 20 of the fourth gearbox 19 is connected to the circulating water pump 17, driving the circulating water pump 17 to work. The solar collector 18 is connected to the hot water storage tank 25. The heat exchanger 16 is set on the air duct of the first fan 3. The hot water storage tank 25 is connected to the heat exchanger 16 through the circulating water pump 17, forming a closed fluid circulation loop.

[0037] More specifically: the first wind turbine 1 is a horizontal axis wind turbine, and the second wind turbine 7 is a vertical axis wind turbine. The second wind turbine 7 adopts a drag-type or lift-type blade structure, which does not require a wind-fighting device and can operate stably in environments with changing wind directions.

[0038] More specifically: the rotation speeds of the first fan 3, the exhaust fan 5, and the induced draft fan 9 are independently adjusted by the first gearbox 2, the second gearbox 6, and the third gearbox 8, respectively, to control the airflow speed and volume entering and exiting the drying chamber 4.

[0039] More specifically: By using the gear set inside the second gearbox 6 to achieve power splitting and speed regulation, the dehumidification fan 5 can maintain an appropriate speed at different wind speeds, ensuring stable dehumidification effect.

[0040] More specifically: The drying chamber 4 is equipped with several dehumidification fans 5, which are evenly distributed along the airflow direction on the top of the drying chamber 4 to form a forced dehumidification airflow and enhance the uniformity of humid air discharge.

[0041] More specifically: the dehumidification fan 5 works in conjunction with the induced draft fan 9 to form a unidirectional forced dehumidification airflow from the air inlet to the air outlet 10 inside the drying chamber 4.

[0042] More specifically: The workflow is as follows: When wind resources are sufficient, natural wind drives the first wind turbine 1 to rotate, and mechanical energy is adjusted by the first gearbox 2 to drive the first fan 3 to rotate. The first fan 3 draws in air from the outside to form a normal temperature dry airflow, which is sent into the drying chamber 4 to dry the material.

[0043] Natural wind drives the second fan 7 to rotate. The power is adjusted by the second gearbox 6 and the third gearbox 8 respectively, and then drives the exhaust fan 5 and the induced draft fan 9. The exhaust fan 5 actively extracts the moisture generated by the evaporation of the material in the drying box 4, and the induced draft fan 9 provides suction at the exhaust end. The two work together to establish a stable, unidirectional airflow from the air inlet to the air outlet 10 inside the drying box 4, effectively avoiding moisture short-circuiting and local dead zones.

[0044] Meanwhile, the solar collector 18 absorbs solar energy to heat the internal working fluid (water), which is then stored in the hot water storage tank 25. The system operates at maximum energy efficiency and performs room temperature air drying.

[0045] When the ambient temperature is low and the air humidity is high, it is necessary to appropriately increase the drying rate to meet production needs. Start the solar collector 18. At this time, the first wind turbine 1 drives the circulating water pump 17 to run, pushing the high-temperature working fluid in the hot water storage tank 25 through the heat exchanger 16. The room temperature drying airflow sent in by the first fan 3 exchanges heat with the high-temperature working fluid inside the heat exchanger 16 when it flows through the air duct. The drying airflow is gently heated and then enters the drying box 4.

[0046] When the wind weakens or there is no wind, the clutch 22 switches to electric drive mode, and the electric motor 21 is driven by the power grid. The electric motor 21 is connected to the clutch 22 to provide power to the first gearbox 2 and the fourth gearbox 19. After the power is adjusted, it drives the first fan 3 and the circulating water pump 17 to continue to operate.

[0047] Example 2: The method for drying agricultural and sideline products in arid areas based on wind power direct drive and solar thermal complementarity is implemented based on the agricultural and sideline product drying system for arid areas based on wind power direct drive and solar thermal complementarity described in Example 1. Specifically:

[0048] Step 1: When there is sufficient wind, the first fan 3 is directly driven by the first wind turbine 1 to achieve efficient drying;

[0049] Step 2: The solar collector 18 absorbs solar energy, heats the internal working fluid, and stores it in the hot water storage tank 25;

[0050] Step 3: When the ambient temperature is low and the air humidity is high, start the solar collector 18, and the first wind turbine 1 drives the circulating water pump 17 to run, driving the internal working fluid to flow through the air duct installed in the heat exchanger 16.

[0051] Step 4: When the wind weakens or there is no wind, the clutch 22 switches, and the power grid supplies power to the motor 21. The motor 21 is connected to the clutch 22 to provide power to the first gearbox 2 and the fourth gearbox 19. After the power is adjusted, it drives the first fan 3 and the circulating water pump 17 to continue to operate.

[0052] Step 5: When the ambient temperature dry airflow sent in by the third fan 3 flows through the heat exchanger 16, it exchanges heat with the internal working fluid.

[0053] Step Six: The heated, room-temperature dry airflow enters the drying chamber 4 to dry the material;

[0054] Step 7: Natural wind simultaneously drives the second fan 7 to rotate. The power is adjusted by the second gearbox 6 and the third gearbox 8 respectively, and then drives the exhaust fan 5 and the induced draft fan 9. The exhaust fan 5 actively extracts the high humidity air generated by the evaporation of materials in the drying box 4, and the induced draft fan 9 provides suction at the exhaust end. The two work together to form a unidirectional forced airflow field inside the drying box 4, accelerating the removal of moisture.

[0055] Example 3: Taking the Dabancheng wind zone in Xinjiang as an example, the economic and environmental benefits of the present invention are clearly illustrated:

[0056] Using a processing center for agricultural and sideline products in the Dabancheng wind zone of Xinjiang as a model, this invention was compared with four traditional drying schemes. The region has an average annual wind speed of ≥7m / s, an annual equivalent full-load wind hours of 2800h, an annual sunshine duration of more than 3000h, and an annual total solar radiation of 5800MJ / m², with significant dry climate characteristics.

[0057] 1. System Scale and Basic Parameters

[0058] A single batch can process 20 tons of fresh fruit (initial moisture content 80%, target 20%), with a single batch drying time of t=120 hours, and 54 batches can be operated per year;

[0059] 1. Basic parameters

[0060] air density =1.2kg / m 3 ;

[0061] Effective ventilation cross-sectional area A = 7.2m 2 ;

[0062] 2. Efficiency parameters

[0063] If the aerodynamic efficiency of the wind turbine rotor is taken as 75% and the mechanical transmission efficiency as 98%, then the total efficiency of direct wind power drive is:

[0064] η 风直 =75% × 98% = 73.5%;

[0065] The average annual efficiency η of solar collectors 光热 =50%;

[0066] Overall efficiency of heat storage and heat exchange η 储 =85%;

[0067] 3. Price and Emissions

[0068] The price of electricity for large industrial users is 0.45 yuan / kWh, the price of coal is 800 yuan / ton, the calorific value of coal is 29270kJ / kg, the carbon trading price is 50 yuan / ton, and the CO2 emission factor of the power grid is 0.6kg / kWh.

[0069] II: Energy Input and Output of the System of the Invention

[0070] 1. Wind power direct-drive fan section

[0071] In this invention, the first fan 1 directly drives the first fan 3 to draw in fresh air from the outside (make-up air position) and send it into the drying box 4. The second fan 7 independently drives the exhaust fan 5 and the induced draft fan 9 to extract the high humidity air in the box (exhaust position), forming a unidirectional forced airflow.

[0072] The design wind speed is v1=3m / s, the total system head is H1=1400Pa, and the fresh air replenishment ratio is n1=3.

[0073] Air volume:

[0074] Q1 = Av1 = 7.2 × 3 = 21.6m 3 / s;

[0075] Wind turbine shaft power:

[0076] P1= ≈41.14kW;

[0077] Single batch mechanical work:

[0078] E 机 =P1t=41.14×120=4936.8kWh;

[0079] Annual wind power mechanical work:

[0080] E 年风 =4936.8×54=2.666×10 5 kWh (9.60×10 8 kJ);

[0081] 2. Solar thermal component

[0082] The solar collector 18 absorbs heat and heats the dry air delivered by the first fan 3 through the heat exchanger 16 (auxiliary heating to cope with low temperature and high humidity conditions).

[0083] Heat collection area A 集 =200m 2 Annual total solar radiation I = 5800 MJ / m 2 ;

[0084] Annual heat collection Q 集 =A 集 Iη 光热 =200×5800×50%=5.80×10 5 MJ;

[0085] Effective heat supply Q 效 =Q 集 η 储 =5.80×10 5 ×85%=4.93×10 5MJ (4.93×10) 8 kJ);

[0086] Equivalent replacement electricity 热 = ≈1.369×10 5 kWh;

[0087] 3. Power grid backup

[0088] Dabancheng experiences wind speeds of ≥3m / s for over 85% of the year, and during windless periods, the annual grid power replenishment is less than 5000kWh, making the cost negligible.

[0089] Part 3: Comparison of Four Traditional Drying Methods (Single Batch)

[0090] Traditional solutions use 60℃ hot air drying, with the main fan, exhaust fan, and induced draft fan all driven by the power grid, and electric heating providing the heat.

[0091] The design wind speed is v2=0.5m / s, the total system head is H2=800Pa, and the fresh air replenishment ratio is n2=2.

[0092] Air volume:

[0093] Q² = Av² = 7.2 × 0.5 = 3.6m 3 / s;

[0094] Wind turbine shaft power:

[0095] P2= Take the wind turbine efficiency η 风 =70%, then P2 ≈4.11kW;

[0096] Power consumption of a single batch of wind turbines (motor efficiency 92%):

[0097] E 风力机电 = ≈536kWh;

[0098] The batch dehydration capacity is 12 tons, and the heating energy consumption is 2.0 kWh / kg for every 1 kg of water dehydrated.

[0099] Heating power consumption E 加热 =12000×2.0=24000kWh;

[0100] Total power consumption per batch:

[0101] E 总 =536+24000=24536kWh, take 24500kWh;

[0102] The electricity cost for a single batch is 24500 × 0.45 = 11025 yuan;

[0103] The carbon emissions per batch are 24,500 × 0.6 = 14.7 tons. ;

[0104] Data for the other three traditional solutions (coal-fired, pure photovoltaic, and traditional wind power) are shown in Table 1:

[0105] Table 1

[0106]

[0107] IV: Economic Evaluation of the Invention System

[0108] 1. Investment Estimate:

[0109] 150kW horizontal axis wind turbine, 200m 2 The total investment for solar collectors and hot water storage tanks, drying chambers, dehumidification units, transmission control and installation, etc., is 2.3 million yuan.

[0110] 2. Operation and Maintenance:

[0111] The annual maintenance fee rate is 5%, the annual maintenance fee is 115,000 yuan, and the cost per batch is about 2,130 yuan.

[0112] 3. Revenue Structure:

[0113] Electricity savings: Compared to electric heating solutions, a single batch can save 11,025 yuan;

[0114] Quality premium: Drying at room temperature avoids high temperatures damaging nutrients, increasing the selling price by 30%;

[0115] The premium for a single batch is 4 × 1000 × 20 × 30% = 24,000 yuan;

[0116] Carbon emission reduction benefits: Compared with the coal-fired scheme, the emission reduction per batch is 7.42 tons;

[0117] Profit: 7.42 × 50 = 371 yuan;

[0118] Net profit per batch: 11025 + 24000 + 371 - 2130 = 33266 yuan;

[0119] Annual net income: 33266 × 54 = 1.796 million yuan;

[0120] Static payback period: T = ≈1.28 years (approximately 15.4 months);

[0121] If we can secure a 25% government subsidy for clean energy;

[0122] Actual Investment I 0' =230×0.75=1.725 million yuan;

[0123] Recovery period T' = ≈0.96 years (approximately 11.5 months);

[0124] V. Overall Conclusions and Scale-up Benefit Analysis

[0125] Based on the above calculations using real resource data from the Dabancheng wind zone in Xinjiang, it can be seen that the "wind power direct drive + solar thermal assisted" drying method of this invention can save 595,000 yuan in electricity costs per year compared with traditional electrothermal drying (11,025 yuan per batch, with 54 batches operated per year). The static investment payback period is about 1.28 years (about 15 months). If a 25% government clean energy subsidy is obtained, the actual payback period can be shortened to 0.96 years (about 11.5 months).

[0126] At the same time, it can save about 154 tons of standard coal and reduce CO2 emissions by about 401 tons per year (compared to coal-fired projects), with extremely significant economic and environmental benefits. It is particularly suitable for continuous, high-quality, and low-cost drying and processing of characteristic agricultural and sideline products such as Xinjiang red dates, raisins, goji berries, chili peppers, and forage grass, and has good industrialization prospects and promotion and application value.

[0127] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein; as long as there is no structural conflict, the various features in the specific embodiments disclosed in this application can be combined with each other in any way, and will not cause the substance of the corresponding technical solutions to deviate from the scope of the technical solutions of the present invention.

[0128] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A system for drying agricultural and sideline products based on wind power direct drive and solar light heat complementation suitable for dry areas, characterized in that, Includes a first wind turbine (1), a first gearbox (2), a first fan (3), a drying box (4), an exhaust fan (5), a second gearbox (6), a second wind turbine (7), a third gearbox (8), an induced draft fan (9), an air outlet (10), a heat exchanger (16), a circulating water pump (17), a solar collector (18), a fourth gearbox (19), an electric motor (21), a clutch (22), and a hot water storage tank (25); The first output shaft (11) of the first wind turbine (1) is connected to the clutch (22), the grid drives the motor (21), the second output shaft (23) of the motor (21) is connected to the clutch (22), the third output shaft (24) of the clutch (22) is connected to both the first gearbox (2) and the fourth gearbox (19), the fourth output shaft (12) of the first gearbox (2) is connected to the first fan (3), the air outlet of the first fan (3) is connected to the air inlet of the drying box (4) through the air duct, the dehumidification fan (5) is set at the dehumidification port of the drying box (4), the induced draft fan (9) is set at the air outlet (10) of the drying box (4), the fifth output shaft (15) of the second wind turbine (7) is connected to both the second gearbox (6) and the third gearbox (8), the sixth output shaft (13) of the second gearbox (6) is connected to the dehumidification fan (5), and the seventh output shaft (14) of the third gearbox (8) is connected to the induced draft fan (9); The eighth output shaft (20) of the fourth gearbox (19) is connected to the circulating water pump (17), the solar collector (18) is connected to the hot water storage tank (25), the heat exchanger (16) is set on the air duct of the first fan (3), and the hot water storage tank (25) is connected to the heat exchanger (16) through the circulating water pump (17) to form a closed fluid circulation loop.

2. The agricultural and sideline products drying system based on wind energy direct drive and solar light heat complementary suitable for dry areas according to claim 1, characterized in that, The first wind turbine (1) is a horizontal axis wind turbine, and the second wind turbine (7) is a vertical axis wind turbine. The second wind turbine (7) adopts a drag-type or lift-type blade structure.

3. The agricultural and sideline products drying system based on wind energy direct drive and solar light heat complementary suitable for dry areas according to claim 1, characterized in that, The drying chamber (4) is equipped with several exhaust fans (5), which are evenly distributed on the top of the drying chamber (4) along the airflow direction.

4. The agricultural and sideline products drying system based on wind energy direct drive and solar light heat complementary suitable for dry areas according to claim 1, characterized in that, The rotational speeds of the first fan (3), the dehumidifying fan (5), and the induced draft fan (9) are independently adjusted by the first gearbox (2), the second gearbox (6), and the third gearbox (8), respectively.

5. A method for drying agricultural and sideline products in arid regions based on wind-driven direct-drive and solar-thermal complementary systems, implemented using the agricultural and sideline product drying system for arid regions as described in claim 1, characterized in that... Specifically: Step 1: When there is sufficient wind, the first wind turbine (1) directly drives the first fan (3) to achieve efficient drying; Step 2: The solar collector (18) absorbs solar energy, heats the internal working fluid, and stores it in the hot water storage tank (25); Step 3: When the ambient temperature is low and the air humidity is high, start the solar collector (18), and the first wind turbine (1) drives the circulating water pump (17) to run, driving the internal working fluid to flow through the heat exchanger (16). Step 4: When the wind weakens or there is no wind, the clutch (22) switches, and the power grid supplies power to the motor (21). The motor (21) is connected to the clutch (22) to provide power to the first gearbox (2) and the fourth gearbox (19). After the power is adjusted, it drives the first fan (3) and the circulating water pump (17) to continue to operate. Step 5: When the ambient temperature dry airflow sent in by the third fan (3) flows through the air duct, it exchanges heat with the internal working fluid of the heat exchanger (16); Step 6: The heated room temperature dry airflow enters the drying chamber (4) to dry the material; Step 7: Natural wind simultaneously drives the second fan (7) to rotate. The power is adjusted by the second gearbox (6) and the third gearbox (8) respectively, and then drives the exhaust fan (5) and the induced draft fan (9). The exhaust fan (5) actively extracts the high humidity air generated by the evaporation of materials in the drying box (4), and the induced draft fan (9) provides suction at the exhaust end. The two work together to form a unidirectional, forced airflow field inside the drying box (4) to accelerate the discharge of moisture.

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