A photovoltaic and fuel based drying steam generation system

Abstract

This invention discloses a photovoltaic and fuel-based drying steam generation system, relating to the field of drying equipment. The system includes a photovoltaic water heater, an insulated water tank, a steam generator, and a heat exchanger. The outlet of the photovoltaic water heater is connected to the inlet of the insulated water tank via a first pipe. The outlet of the insulated water tank is connected to the inlet of the steam generator via a second pipe. The steam inlet of the steam generator is connected to the heat exchanger via a third pipe. The drain outlet of the heat exchanger is connected to the inlet of the insulated water tank via a fourth pipe. The photovoltaic water heater converts solar energy into heat energy to heat water. The heated water is stored in the insulated water tank and supplied to the steam generator. The steam generator heats the water to its boiling point to generate steam. The steam heats air through the heat exchanger, and the hot air is delivered to the drying equipment to dry agricultural products. Because the hot water is directly heated, steam is generated quickly, reducing energy consumption and lowering costs.

Description

Technical Field

[0001] This invention relates to the field of drying equipment, specifically a drying steam generation system based on photovoltaics and fuel. Background Technology

[0002] Northwest and Southwest my country possess unique resource endowments and industrial demands: the region generally receives 2,500-3,600 hours of sunshine annually, ranking among the top in the country in terms of solar energy resource abundance, giving it a natural advantage for large-scale development and utilization; at the same time, as the core production area for specialty agricultural products such as goji berries, raisins, codonopsis, and tea, drying agricultural products is a key step in ensuring quality and extending shelf life. These agricultural products have high moisture content, and if not dried in time, they are prone to mold and saccharification, directly affecting product grade and economic benefits. Therefore, there is a rigid demand for a continuous and stable supply of steam.

[0003] Currently, the mainstream steam generation schemes for drying in this region are mainly driven by natural gas, supplemented by coal-fired boilers in some remote areas. However, all of these schemes have significant technical shortcomings and are difficult to adapt to the region's development needs: First, there is a prominent contradiction between energy costs and supply stability. As a fossil fuel, natural gas prices have fluctuated frequently in recent years, and most production areas in this region are located in remote areas with long fuel transportation radii and high logistics costs, resulting in high unit energy consumption costs for steam generation. Second, energy utilization is low, and resource waste is serious. Existing systems lack efficient insulation and waste heat recovery designs: heat loss rates during hot water transportation and storage reach 20%-30%. After steam condenses in the heat exchanger, the high-temperature condensate is directly discharged without recycling, wasting water resources (some areas in this region suffer from water shortages) and losing a large amount of latent heat. At the same time, during long-term operation of the steam generator, calcium and magnesium ions in the water easily precipitate to form scale, which adheres to the cavity walls, causing the heat exchange efficiency to decrease by more than 30% annually, further exacerbating energy waste. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a drying steam generation system based on photovoltaics and fuel to solve the deficiencies of the prior art.

[0005] The objective of this invention is achieved through the following technical solution: a photovoltaic and fuel-based drying steam generation system, comprising a photovoltaic water heater, an insulated water tank, a steam generator, and a heat exchanger. The outlet port of the photovoltaic water heater is connected to the inlet port of the insulated water tank via a first pipe. The outlet port of the insulated water tank is connected to the inlet port of the steam generator via a second pipe. The steam port of the steam generator is connected to the heat exchanger via a third pipe. The drain port of the heat exchanger is connected to the inlet port of the insulated water tank via a fourth pipe. The heat exchanger uses the steam input from the steam generator to heat air and delivers the heated air to the drying equipment.

[0006] Furthermore, the circulation port of the insulated water tank is connected to the inlet port of the photovoltaic water heater through a fifth pipe, a first electric pump is installed on the fifth pipe, and a second electric pump is installed on the second pipe.

[0007] Furthermore, the insulated water tank is provided with a water storage chamber and a spare chamber, which are independent of each other. The second pipe is connected to the water storage chamber. The end of the first pipe near the insulated water tank is divided into two branch pipes, which are respectively connected to the water storage chamber and the spare chamber. The end of the fifth pipe near the insulated water tank is divided into two circulation branch pipes, which are respectively connected to the water storage chamber and the spare chamber. Solenoid valves are installed on both the branch pipes and the circulation branch pipes.

[0008] Furthermore, the steam generator includes a steam boiler, which has a first chamber and a second chamber independently provided inside. Both the first chamber and the second chamber are connected to acid supply branch pipes, which are connected to the acid supply main pipe. The third pipe is divided into two steam branch pipes at the end near the heat exchanger, and the two steam branch pipes are respectively connected to the first chamber and the second chamber.

[0009] Furthermore, both the first cavity and the second cavity are equipped with a scale removal mechanism. The scale removal mechanism includes a cleaning rod and a cleaning horizontal plate. The cleaning rod is horizontally inserted into the steam boiler and fixedly connected to the cleaning horizontal plate. The cleaning rod has the freedom to move in the horizontal direction. The bottom of the cleaning horizontal plate is densely arranged with several bristles.

[0010] Furthermore, the scale removal mechanism also includes a cleaning bracket, a lead screw, and a lead screw nut. The cleaning bracket is fixed to the side wall of the steam generator. The lead screw is rotatably mounted on the cleaning bracket. The lead screw nut is threaded onto the lead screw. The end of the cleaning rod away from the cleaning cross plate is connected to the lead screw nut. The cleaning rod slides through the cleaning bracket. A motor is mounted on the cleaning bracket, and the output shaft of the motor is connected to the lead screw.

[0011] Furthermore, the cleaning rod includes a main drive rod and a vibrating rod. One end of the main drive rod is connected to a lead screw nut, and the other end has a mounting hole. One end of the vibrating rod is slidably fitted into the mounting hole, and the other end is connected to the cleaning cross plate. A spring is installed in the mounting hole, and the two ends of the spring are respectively connected to the main drive rod and the vibrating rod. The vibrating rod can reciprocate linearly along the axial direction of the main drive rod.

[0012] Furthermore, an exciter is mounted on the main drive rod, and a vibration plate is fixed to the side wall of the vibration rod, with the vibration plate located on the vibration path of the exciter.

[0013] Furthermore, a vibrator mounting plate is fixed to the side wall of the main drive rod, a telescopic rod is connected to the vibrator mounting plate, the telescopic rod is connected to the vibrator, and a compensation spring is fitted on the telescopic rod, the elastic modulus of the compensation spring being greater than the elastic modulus of the spring.

[0014] The beneficial effects of this invention are: 1. Photovoltaic water heaters convert solar energy into heat energy to heat water. This process consumes virtually no energy. The hot water heated by the photovoltaic water heater is stored in an insulated water tank and then supplied to a steam generator. The steam generator heats the hot water to its boiling point to produce steam. The steam then heats the air through a heat exchanger, and the hot air is transported to the drying equipment to dry agricultural products. Because the hot water is heated directly, steam can be generated quickly, reducing energy consumption and lowering costs.

[0015] 2. After passing through the heat exchanger, the steam is recovered into the insulated water tank through the fourth pipe and used by the steam generator, realizing waste heat recovery and having the effect of secondary energy-saving recovery, which greatly improves energy utilization. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of a drying steam generation system based on photovoltaics and fuel according to the present invention; Figure 2 This is a schematic diagram of the internal structure of a steam generator in a photovoltaic and fuel-based drying steam generation system according to the present invention. Figure 3 for Figure 2 Enlarged view of point A in the middle; Figure 4 for Figure 2 Enlarged view at point B in the middle; Figure 5 This is a schematic diagram of the structure of a steam boiler in a photovoltaic and fuel-based drying steam generation system according to the present invention; Figure 6 This is a schematic diagram of the structure of the insulated water tank in a photovoltaic and fuel-based drying steam generation system according to the present invention; In the diagram, 1-Photovoltaic water heater, 2-Insulated water tank, 3-Steam generator, 4-Heat exchanger, 5-First pipe, 6-Second pipe, 7-Third pipe, 8-Fourth pipe, 9-Fifth pipe, 10-First electric pump, 11-Second electric pump, 12-Water storage chamber, 13-Spare chamber, 14-Steam boiler, 15-First chamber, 16-Second chamber, 17-Acid supply branch pipe, 18-Cleaning rod, 19-Cleaning cross plate, 20-Brush bristles, 21-Cleaning bracket, 22-Screw rod, 23-Screw rod nut, 24-Motor, 25-Main drive rod, 26-Vibration rod, 27-Mounting hole, 28-Spring, 29-Vibrator, 30-Vibration plate, 31-Vibrator mounting plate, 32-Telescopic rod, 34-Through hole, 35-Annular step, 36-Sealing ring, 37-Stepped threaded column. Detailed Implementation

[0017] Example 1 like Figures 1 to 6 As shown, a photovoltaic and fuel-based drying steam generation system includes a photovoltaic water heater 1, an insulated water tank 2, a steam generator 3, and a heat exchanger 4. The outlet port of the photovoltaic water heater 1 is connected to the inlet port of the insulated water tank 2 via a first pipe 5. The outlet port of the insulated water tank 2 is connected to the inlet port of the steam generator 3 via a second pipe 6. The steam port of the steam generator 3 is connected to the heat exchanger 4 via a third pipe 7. The drain port of the heat exchanger 4 is connected to the inlet port of the insulated water tank 2 via a fourth pipe 8. The heat exchanger 4 uses the steam input from the steam generator 3 to heat air and then delivers the heated air to the drying equipment. The photovoltaic water heater converts solar energy into thermal energy to heat water; this process is essentially energy-efficient. The photovoltaic water heater heats hot water, which is stored in an insulated water tank. This tank then supplies hot water to a steam generator, which heats the water to its boiling point to produce steam. The steam then heats air through a heat exchanger, and the hot air is transported to a drying equipment to dry agricultural products. Because the hot water is heated directly, steam is generated quickly, reducing energy consumption and lowering costs. The heat exchanger 4 is connected to the insulated water tank 2 via a fourth pipe 8. After passing through the heat exchanger 4, the steam enters the fourth pipe 8, where it exchanges heat with the air and condenses into hot water at a temperature of 30-40°C. This hot water is then returned to the insulated water tank 2, achieving waste heat recovery and secondary energy-saving effects, significantly improving energy utilization. In practice, the photovoltaic water heater 1 is equipped with a cold water inlet pipe. The photovoltaic water heater 1 delivers the heated hot water to the insulated water tank 2, and then replenishes water through the cold water inlet pipe for heating, achieving a hot water supply cycle.

[0018] Example 2 Based on Example 1, such as Figure 1As shown, the circulation port of the insulated water tank 2 is connected to the inlet port of the photovoltaic water heater 1 through the fifth pipe 9. The fifth pipe 9 is equipped with a first electric pump 10, and the second pipe 6 is equipped with a second electric pump 11. When the steam generator 3 stops or is under maintenance, the insulated water tank 2 stops supplying hot water to the steam generator 3. At this time, the temperature of the hot water in the insulated water tank 2 will gradually decrease. Therefore, the first electric pump 10 is used to refill the water in the insulated water tank 2 into the photovoltaic water heater 1 for heating, so as to avoid the hot water being added into the steam generator 3.

[0019] Example 3 Based on Example 2, such as Figure 1 and Figure 6 As shown, the insulated water tank 2 is equipped with a water storage chamber 12 and a backup chamber 13. The water storage chamber 12 and the backup chamber 13 are independent of each other. The second pipe 6 connects to the water storage chamber 12. The first pipe 5 is divided into two branches near the end of the insulated water tank 2. The two branches connect to the water storage chamber 12 and the backup chamber 13 respectively. The fifth pipe 9 is divided into two circulation branches near the end of the insulated water tank 2. The two circulation branches connect to the water storage chamber 12 and the backup chamber 13 respectively. Solenoid valves are installed on both the branch pipes and the circulation branch pipes. The insulated water tank 2 has two independent chambers, namely the water storage chamber 12 and the backup chamber 13. One is in working state and the other is in standby state, which can clean the scale in the chambers without stopping the machine.

[0020] Example 4 Based on Example 3, such as Figure 1 , Figure 2 and Figure 5As shown, the steam generator 3 includes a steam boiler 14, within which are independently provided a first chamber 15 and a second chamber 16. Both the first chamber 15 and the second chamber 16 are connected to acid supply branch pipes 17, which are connected to the main acid supply pipe. The third pipe 7, near the heat exchanger 4, splits into two steam branch pipes, which are respectively connected to the first chamber 15 and the second chamber 16. After the steam generator 3 has been operating for a period of time, a large amount of scale will be generated inside, significantly reducing heat exchange efficiency and increasing energy consumption. Therefore, independent first chambers 15 and second chambers 16 are provided within the steam boiler 14. When cleaning scale, the first chamber 15 corresponds to... The valve of the steam branch pipe of the first chamber 15 is opened and the valve of the steam branch pipe corresponding to the second chamber 16 is closed, so that the first chamber 15 supplies steam to the heat exchanger 4. The acid supply branch pipe 17 corresponding to the second chamber 16 introduces acid into the second chamber 16. The acid reacts with the scale, making the scale easier to clean. After cleaning, the valve of the steam branch pipe corresponding to the second chamber 16 is opened and the valve of the steam branch pipe corresponding to the first chamber 15 is closed, so that the second chamber 16 supplies steam to the heat exchanger 4. The acid supply branch pipe 17 corresponding to the first chamber 15 introduces acid into the first chamber 15, thus cleaning the scale in the first chamber 15. This allows the scale cleaning of the steam generator 3 to be completed without stopping the machine.

[0021] Example 5 Based on Example 4, such as Figures 1 to 5 As shown, both the first cavity 15 and the second cavity 16 are equipped with a scale removal mechanism. The scale removal mechanism includes a cleaning rod 18 and a cleaning cross plate 19. The cleaning rod 18 is horizontally inserted into the steam boiler 14 and fixedly connected to the cleaning cross plate 19. The cleaning rod 18 has the freedom to move in the horizontal direction. The bottom of the cleaning cross plate 19 is densely arranged with several bristles 20. The scale removal mechanism also includes a cleaning bracket 21, a lead screw 22, and a lead screw nut 23. The cleaning bracket 21 is fixed to the side wall of the steam generator 3. The lead screw 22 is rotatably mounted on the cleaning bracket 21. The lead screw nut 23 is threaded onto the lead screw 21. 2. The end of the cleaning rod 18 furthest from the cleaning cross plate 19 is connected to the lead screw nut 23. The cleaning rod 18 slides through the cleaning bracket 21, on which a motor 24 is mounted. The output shaft of the motor 24 is connected to the lead screw 22. The motor 24 drives the lead screw 22 to rotate, causing the lead screw nut 23 to move the cleaning rod 18. This causes the cleaning rod 18 to move the cleaning cross plate 19 from one end of the steam generator 3 to the other end, thereby cleaning the scale through the bristles 20 on the cleaning cross plate 19. Combined with the reaction of the acid, the scale in the steam generator 3 can be cleaned quickly and effectively. In specific implementation, drain pipes are connected to the bottom of both the first chamber 15 and the bottom of the second chamber 16 to discharge the wastewater from the scale removal process.

[0022] Example 6 Based on Example 5, such as Figures 1 to 5 As shown, the cleaning rod 18 includes a main drive rod 25 and a vibrating rod 26. One end of the main drive rod 25 is connected to a lead screw nut 23, and the other end has a mounting hole 27. One end of the vibrating rod 26 is slidably fitted into the mounting hole 27, and the other end is connected to the cleaning cross plate 19. A spring 28 is installed in the mounting hole 27, and the two ends of the spring 28 are respectively connected to the main drive rod 25 and the vibrating rod 26. The vibrating rod 26 can reciprocate linearly along the axial direction of the main drive rod 25. An exciter 29 is installed on the main drive rod 25, and the side wall of the vibrating rod 26 is fixed. A vibrating plate 30 is positioned on the vibration path of the vibrator 29. The lead screw nut 23 drives the main drive rod 25 to move forward gradually. At the same time, the vibrator 29 operates, causing the vibrator 29 to push the vibrating plate 30 away from the main drive rod 25. When the vibrator 29 resets, the vibrating rod 26 resets under the action of the spring 28, thereby converting the vibration of the vibrator 29 into the reciprocating linear motion of the vibrating rod 26. This allows the cleaning plate 19, carrying the brush bristles 20, to simulate the back-and-forth cleaning action of a person, effectively brushing off the attached scale.

[0023] Example 7 Based on Example 6, such as Figures 1 to 4 As shown, a vibrator mounting plate 31 is fixed to the side wall of the main drive rod 25. A telescopic rod 32 is connected to the vibrator mounting plate 31, and the telescopic rod 32 is connected to the vibrator 29. A compensation spring 33 is fitted on the telescopic rod 32. The elastic modulus of the compensation spring 33 is greater than that of the spring 28. When the cleaning plate 19 moves to the end of the steam generator 3, the reciprocating motion of the cleaning plate 19 will interfere with the inner wall of the steam generator 3. To avoid damage to the steam generator 3, the vibrator 29 is flexibly installed. When the cleaning plate 19 contacts the steam generator... After the inner wall of 3, when the vibrator 29 continues to drive the vibrating rod 26 forward through the vibrating plate 30, the compensating spring 33 is compressed by the steam generator 3 to absorb the elongation of the vibrator 29, thereby avoiding interference between the cleaning plate 19 and the steam generator 3 and protecting the steam generator 3 from damage by the scale cleaning mechanism. The elastic modulus of the compensating spring 33 is greater than that of the spring 28, so that the spring 28 is stretched first, and when the cleaning plate 19 is not blocked, the vibrator 29 can smoothly drive the vibrating rod 26 to perform reciprocating linear motion.

[0024] Example 8 Based on Example 7, such as Figures 1 to 4As shown, the inner wall of the steam generator 3 has a through hole 34 for the vibrating rod 26 to pass through. An annular step 35 is formed inside the through hole 34. A sealing ring 36 is installed inside the through hole 34. The vibrating rod 26 passes through the inner ring of the sealing ring 36. The diameter of the inner ring of the sealing ring 36 is larger than the diameter of the vibrating rod 26. A stepped threaded post 37 is movably fitted on the vibrating rod 26. The threads of the stepped threaded post 37 are adapted to the through hole 34. The stepped threaded post 37 presses the sealing ring 36 against the annular step 35, causing the sealing ring 36 to be axially compressed, thereby making the inner ring of the sealing ring 36 tightly adhere to the vibrating rod 26. The outer wall of the rod 26 forms a high-strength sealing surface, and the outer ring of the sealing ring 36 is tightly attached to the inner wall of the through hole 34 to form a high-strength sealing surface. Thus, when no scale is cleaned, tightening the stepped threaded post 37 achieves a seal between the vibrating rod 26 and the through hole 34, preventing steam leakage. When scale is cleaned, loosening the stepped threaded post 37 creates a gap between the sealing ring 36 and the vibrating lever 26, facilitating the movement of the vibrating rod 26 within the sealing ring 36. This prevents the reciprocating motion of the vibrating rod 26 from causing rapid wear of the sealing ring 36, greatly extending the service life of the sealing ring 36.

Claims

1. A drying steam generation system based on photovoltaics and fuel, characterized in that, The device includes a photovoltaic water heater (1), an insulated water tank (2), a steam generator (3), and a heat exchanger (4). The outlet of the photovoltaic water heater (1) is connected to the inlet of the insulated water tank (2) through a first pipe (5). The outlet of the insulated water tank (2) is connected to the inlet of the steam generator (3) through a second pipe (6). The steam outlet of the steam generator (3) is connected to the heat exchanger (4) through a third pipe (7). The drain outlet of the heat exchanger (4) is connected to the inlet of the insulated water tank (2) through a fourth pipe (8). The heat exchanger (4) uses the steam input from the steam generator (3) to heat the air and delivers the heated air to the drying equipment.

2. The drying steam generation system based on photovoltaics and fuel according to claim 1, characterized in that, The circulation port of the insulated water tank (2) is connected to the inlet port of the photovoltaic water heater (1) through the fifth pipe (9). The fifth pipe (9) is equipped with a first electric pump (10), and the second pipe (6) is equipped with a second electric pump (11).

3. The drying steam generation system based on photovoltaics and fuel according to claim 2, characterized in that, The insulated water tank (2) is provided with a water storage chamber (12) and a spare chamber (13). The water storage chamber (12) and the spare chamber (13) are independent of each other. The second pipe (6) is connected to the water storage chamber (12). The first pipe (5) is divided into two branches at one end near the insulated water tank (2). The two branches are connected to the water storage chamber (12) and the spare chamber (13) respectively. The fifth pipe (9) is divided into two circulation branches at one end near the insulated water tank (2). The two circulation branches are connected to the water storage chamber (12) and the spare chamber (13) respectively. Solenoid valves are installed on the branches and circulation branches.

4. The drying steam generation system based on photovoltaics and fuel according to claim 1, characterized in that, The steam generator (3) includes a steam boiler (14), which has a first chamber (15) and a second chamber (16) independently provided inside. Both the first chamber (15) and the second chamber (16) are connected to acid supply branch pipes (17), which are connected to the acid supply main pipe. The third pipe (7) is divided into two steam branch pipes at one end near the heat exchanger (4), and the two steam branch pipes are respectively connected to the first chamber (15) and the second chamber (16).

5. A drying steam generation system based on photovoltaics and fuel according to claim 4, characterized in that, Both the first cavity (15) and the second cavity (16) are equipped with a scale cleaning mechanism. The scale cleaning mechanism includes a cleaning rod (18) and a cleaning horizontal plate (19). The cleaning rod (18) is horizontally inserted into the steam boiler (14) and fixedly connected to the cleaning horizontal plate (19). The cleaning rod (18) has a degree of freedom to move in the horizontal direction. The bottom of the cleaning horizontal plate (19) is densely arranged with several bristles (20).

6. A drying steam generation system based on photovoltaics and fuel according to claim 5, characterized in that, The scale removal mechanism also includes a cleaning bracket (21), a lead screw (22), and a lead screw nut (23). The cleaning bracket (21) is fixed on the side wall of the steam generator (3). The lead screw (22) is rotatably mounted on the cleaning bracket (21). The lead screw nut (23) is threaded onto the lead screw (22). The end of the cleaning rod (18) away from the cleaning cross plate (19) is connected to the lead screw nut (23). The cleaning rod (18) slides through the cleaning bracket (21). A motor (24) is mounted on the cleaning bracket (21). The output shaft of the motor (24) is connected to the lead screw (22).

7. A drying steam generation system based on photovoltaics and fuel according to claim 6, characterized in that, The cleaning rod (18) includes a main drive rod (25) and a vibrating rod (26). One end of the main drive rod (25) is connected to a lead screw nut (23), and the other end is provided with a mounting hole (27). One end of the vibrating rod (26) is slidably fitted into the mounting hole (27), and the other end is connected to a cleaning cross plate (19). A spring (28) is provided in the mounting hole (27). The two ends of the spring (28) are respectively connected to the main drive rod (25) and the vibrating rod (26). The vibrating rod (26) can reciprocate linearly along the axial direction of the main drive rod (25).

8. A drying steam generation system based on photovoltaics and fuel according to claim 7, characterized in that, A vibrator (29) is installed on the main drive rod (25), and a vibrating plate (30) is fixed to the side wall of the vibrating rod (26). The vibrating plate (30) is located on the vibration path of the vibrator (29).

9. A drying steam generation system based on photovoltaics and fuel according to claim 8, characterized in that, The side wall of the main drive rod (25) is fixed with a vibrator mounting plate (31), and a telescopic rod (32) is connected to the vibrator mounting plate (31). The telescopic rod (32) is connected to the vibrator (29), and a compensation spring (33) is fitted on the telescopic rod (32). The elastic modulus of the compensation spring (33) is greater than that of the spring (28).

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