A system for drying sand materials using a solar-heated air blower dryer

Abstract

The present invention discloses a system for drying sand materials by using a solar drying air supply dryer, which includes a rotary kiln dryer, a solar heat collection and dissipation circulation system, an air supply system, and an exhaust waste heat recovery system. The rotary kiln dryer is used for dehydrating and drying materials. The solar heat collection and dissipation circulation system is a water circulation system that uses a solar vacuum tube collector for heat collection and a radiator for heat dissipation. The air supply system includes a heat dissipation air bin for heating cold air and an air supply pipe connecting the heat dissipation air bin and the rotary kiln dryer. An induced draft fan for providing power to the entire air supply system is arranged in the air supply pipe. The exhaust waste heat recovery system includes a waste heat recovery device for heating cold air by using waste heat, and the waste heat recovery device is sleeved on the cold air pipe. The present invention uses solar energy for heat collection and forms a heat collection and dissipation circulation, which not only saves energy and protects the environment but also improves the thermal energy utilization rate, and can realize the energy-saving and environmentally friendly dehydration and drying of sand and gravel materials.

Description

Technical Field

[0001] The present invention relates to the technical field of thermal energy conversion systems, and specifically refers to a system for drying sand materials by using a solar-heated air supply dryer. Background Art

[0002] Dry-mixed mortar, usually called hydraulic cement mixed mortar, refers to a granular or powdery material that is physically mixed in a certain proportion by dried and screened aggregates, inorganic binders, additives, etc., and can be directly used after adding water and mixing. The manufactured sand or natural sand raw materials in dry-mixed mortar need to be dried before use. At present in China, the drying treatment of manufactured sand or natural sand raw materials in dry-mixed mortar mostly uses coal-fired thermal energy to supply air or gas thermal energy to supply air to a rotary kiln for dehydration drying. For every 1 ton of manufactured sand with a moisture content of 5% dried, about 10 kg of coal is required, which is about 5 cubic meters when converted to gas. Using traditional sand drying equipment for dehydration and drying of sand not only has low efficiency, but also has extremely high energy consumption, causing huge pollution. Therefore, designing a low-cost and pollution-free dehydration and drying system is an urgent problem for relevant technical personnel. Summary of the Invention

[0003] To solve the above technical problems, the technical solution provided by the present invention is: a system for drying sand materials by using a solar-heated air supply dryer, including a rotary kiln dryer, a solar heat collection and dissipation circulation system, an air supply system, and an exhaust heat recovery system. The rotary kiln dryer is used for dehydrating and drying materials. The solar heat collection and dissipation circulation system includes a vacuum tube collector for heating cold water, a radiator for heating cold air, and a water pump for providing power to the entire solar heat collection and dissipation circulation system. The air supply system includes a heat dissipation air bin for heating cold air, and an air supply pipe connecting the heat dissipation air bin and the rotary kiln dryer. An induced draft fan for providing power to the entire air supply system is arranged in the air supply pipe. The exhaust heat recovery system includes a waste heat recovery device for heating cold air by using waste heat, and the waste heat recovery device is sleeved on a cold air pipe.

[0004] As an improvement, the rotary kiln dryer includes a rotary body, a feeding port and a discharging port arranged on the rotary body. A hot air port for connecting with an external air supply pipe is arranged in the rotary body, which is used for flipping water-containing sand materials. The feeding port is used for supplying water-containing sand materials, and the discharging port is used for discharging dehydrated and dried sand materials.

[0005] As an improvement, the solar heat collection and dissipation circulation system further includes a chemical dosing device, a makeup water pipe, a high-level makeup water tank, a hot water storage tank, a radiator water supply pipe, a circulating water pipe, and a water pump. The makeup water pipe is used for supplying treated cold water to the high-level makeup water tank, and a chemical dosing device is arranged on the makeup water pipe. The chemical dosing device is used for treating the cold water flowing through the makeup water pipe.

[0006] As an improvement, the high-level water replenishing tank is communicated with the vacuum tube solar collector through the first circulating water pipeline. The vacuum tube solar collector includes a plurality of serially installed vacuum tube solar collectors, which are communicated with the hot water storage tank through a hot water pipe.

[0007] As an improvement, the hot water storage tank is communicated with the radiator through the radiator water supply pipe, and an exhaust valve communicated with the waste heat recovery device is arranged thereon. The exhaust valve is used for discharging the redundant air in the hot water in the hot water storage tank to the waste heat recovery device.

[0008] As an improvement, the radiator is arranged in the heat dissipation air bin and communicated with the water pump through the radiator return water pipe. The radiator return water pipe is arranged in the cold air pipe and laid along the cold air pipe to the pipeline terminal.

[0009] As an improvement, the water pump is used for sending the cooled cold water into the high-level water replenishing tank through the second circulating water pipeline to form a heat collection and heat dissipation cycle.

[0010] As an improvement, the air supply system further includes a cold air pipe. The cold air pipe is sleeved on the radiator return water pipe, one end is connected with an air supply port, and the other end is connected to the heat dissipation air bin. It is used for sending external cold air into the heat dissipation air bin.

[0011] As an improvement, the exhaust waste heat recovery system further includes an exhaust pipe, a condensate collector, an exhaust port, and a dust collector. One end of the exhaust pipe is connected to the rotary kiln dryer, and the other end is connected to the waste heat recovery device. It is used for supplying the high moisture content hot air discharged from the rotary kiln dryer to the waste heat recovery device.

[0012] As an improvement, a rotary dust collector and a condensate discharge valve connected to the condensate collector are arranged on the waste heat recovery device. The condensate discharge valve is used for discharging the condensate generated by the low-temperature gas recovered from the waste heat to the outside of the waste heat recovery device. The dust collector is sleeved on the cold air pipe, one end is connected to the waste heat recovery device, and the other end is connected to the exhaust port. It is used for collecting dust by using the flowing cold air from the waste heat recovery device to the exhaust port.

[0013] The present invention discloses a system for drying sand materials using a solar-heated air supply dryer. The solar energy is converted into heat energy by the vacuum tube collector, heated by the heat exchange medium of the radiator, and transported to the rotary kiln dryer through the air supply pipe to dehydrate and dry the sand and gravel materials. Compared with the traditional dehydration drying method, the present invention has the following advantages: The present invention uses solar energy for heat collection, which not only realizes pollution-free but also greatly reduces the production cost. The solar energy heat storage and dissipation system forms a circulating pipeline, reducing the heat loss during the heat exchange process. The return water after passing through the radiator is laid along the cold air pipe, and the cold air is preheated by using the temperature difference between the cold air and the return water, improving the heat energy utilization rate. The exhaust air system after drying the materials is transformed into a waste heat recovery device at the cold air inlet end, and the cold air is recycled for waste heat recovery using the temperature difference again, reducing the exhaust air temperature and realizing the most efficient utilization of solar energy heat source. The unique cyclone dust collection device uses the kinetic energy of air swirl to achieve efficient dust removal. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the system of a system for drying sand materials using a solar-heated air supply dryer according to the present invention.

[0015] As shown in the figure: 1. Chemical feeder, 2. Make-up water pipe, 3. High-level make-up water tank, 4. Circulating water pipe, 4.1 Circulating water pipe 1, 4.2 Circulating water pipe 2, 5. Vacuum tube collector, 6. Hot water pipe, 7. Hot water storage tank, 7.1 Exhaust valve, 8. Radiator water supply pipe, 9. Radiator, 10. Heat dissipation air chamber, 11. Air supply pipe, 12. Induced draft fan, 13. Rotary kiln dryer, 13.1 Rotary body, 13.2 Feed inlet, 13.3 Discharge outlet, 13.4 Hot air inlet, 14. Exhaust air pipe, 15. Cold air pipe, 16. Waste heat recovery device, 16.1 Discharge valve, 16.2 Condensate collector, 17. Rotary dust collector 18. Air inlet, 19. Air outlet, 20. Radiator return water pipe, 21. Water pump. DETAILED DESCRIPTION OF THE INVENTION

[0016] Combined with the attached Figure 1, A system for drying sand materials using a solar heating air supply dryer, which includes a rotary kiln dryer 13, a solar heat collection and dissipation circulation system, an air supply system, and an exhaust waste heat recovery system. The rotary kiln dryer 13 is used for dehydrating and drying materials. The solar heat collection and dissipation circulation system includes a vacuum tube collector 5 for heating cold water, a radiator 9 for heating cold air, and a water pump 21 for providing power to the entire solar heat collection and dissipation circulation system. The air supply system includes a heat dissipation air bin 10 for heating cold air and an air supply pipe 11 connecting the heat dissipation air bin 10 and the rotary kiln dryer 13. An induced draft fan 12 for providing power to the entire air supply system is provided in the air supply pipe 11. The exhaust waste heat recovery system includes a waste heat recovery device 16 for heating cold air using waste heat, and the waste heat recovery device 16 is sleeved on the cold air pipe 15. As a preferred embodiment of this embodiment, the rotary kiln dryer 13 includes a rotary body 13.1 and a feed inlet 13.2 and a discharge outlet 13.3 provided on the rotary body 13.1. A hot air inlet 13.4 is provided inside the rotary body 13 for connecting to an external air supply pipe 11, which is used for flipping water-containing sand and gravel materials. The feed inlet 13.2 is used for supplying water-containing sand and gravel materials, and the discharge outlet 13.3 is used for discharging dehydrated and dried sand and gravel materials.

[0017] As a preferred embodiment of this embodiment, the solar heat collection and dissipation circulation system further includes a chemical feeder 1, a makeup water pipe 2, a high-level makeup water tank 3, a hot water storage tank 7, a radiator water supply pipe 8, and a circulating water pipe 4. The makeup water pipe 2 is used for supplying treated cold water to the high-level makeup water tank 3, and a chemical feeder 1 is provided on the makeup water pipe 2, which is used for treating the cold water flowing in the makeup water pipe.

[0018] As a preferred embodiment of this embodiment, the high-level makeup water tank 3 is connected to the vacuum tube collector 5 through a circulating water pipe 4.1. The vacuum tube collector 5 includes a plurality of vacuum tube collectors 5 installed in series, which are connected to the hot water storage tank 7 through a hot water pipe 6.

[0019] As a preferred embodiment of this embodiment, the hot water storage tank 7 is connected to the radiator 9 through the radiator water supply pipe 8, and an exhaust valve 7.1 connected to the waste heat recovery device 16 is provided thereon. The exhaust valve 7.1 is used for discharging the excess air in the hot water in the hot water storage tank to the waste heat recovery device 16.

[0020] As a preferred embodiment of this embodiment, the radiator 9 is provided in the heat dissipation air bin 10 and is connected to the water pump 21 through a radiator return pipe 20. The radiator return pipe 20 is provided in the cold air pipe 15 and is laid along the cold air pipe 15 to the pipe terminal.

[0021] Preferably, in this embodiment, the water pump 21 is configured to send the cooled cold water through the second circulating water pipe 4.2 into the high-level makeup water tank 3 to form a heat collection and dissipation cycle.

[0022] Preferably, in this embodiment, the air supply system further includes a cold air duct 15. The cold air duct 15 is sleeved on the radiator return pipe 20, with one end connected to the air supply outlet 18 and the other end accessing the heat dissipation air chamber 10, and is used to send external cold air into the heat dissipation air chamber 10.

[0023] Preferably, in this embodiment, the exhaust heat recovery system further includes an exhaust duct 14, a condensate collector 16.2, an exhaust outlet 19, and a dust collector 17. One end of the exhaust duct 14 is connected to the rotary kiln dryer 13, and the other end is connected to the waste heat recovery device 16, and is used to supply the high moisture content hot air discharged from the rotary kiln dryer 13 to the waste heat recovery device 16.

[0024] Preferably, in this embodiment, the waste heat recovery device 16 is provided with a rotary dust collector 17 and a condensate discharge valve 16.1 connected to the condensate collector 16.2. The condensate discharge valve 16.1 is used to discharge the condensate generated by the low-temperature gas recovered from the waste heat into the waste heat recovery device 16. The dust collector 17 is sleeved on the cold air duct 15, with one end connected to the waste heat recovery device 16 and the other end connected to the exhaust outlet 19, and is used to collect dust by using the flowing cold air from the waste heat recovery device 16 to the exhaust outlet 19.

[0025] When in use, fill the entire heat collection system with treated cold water through the water supply pipe, start the water pump, and slowly circulate the water through the circulating water pipe. The cold water is heated by the series-connected solar vacuum tube collector, and the hot water enters the hot water storage tank through the pipe. The hot water is transported to the heat dissipation air warehouse, and the heat energy conversion is realized through the radiator to heat the air. The circulating water after cooling returns to the high-level water supply tank through the pipe for circulation heating. The heat dissipation return pipe after passing through the radiator is laid along the cold air pipe to the pipe terminal to preheat the flowing cold air to improve the utilization rate of solar thermal energy. The preheated cold air enters the heat dissipation air warehouse for heating, and then is sent to the rotary kiln dryer through the induced draft fan to dry the water-containing sand and gravel turned in the dryer. The hot air with a certain moisture content enters the waste heat recovery device through the exhaust pipe for waste heat recovery. The cold air pipe in the waste heat recovery device is connected, and the cold air is heated by the temperature difference, and the cold air flow is realized through the induced draft fan. The condensed water generated by the low-temperature gas after waste heat recovery is discharged from the waste heat recovery device through the condensed water discharge valve for recycling, and the remaining cold air with a certain humidity is discharged from the system to complete the material drying process. The present invention adopts a heat collection and heat dissipation system of a circulating pipeline to reduce heat loss during the heat exchange process. The return water after the radiator is laid along the cold air pipe, and the cold air is preheated by using the temperature difference between the cold air and the return water. The exhaust system after the dried material is transformed into a waste heat recovery device at the cold air inlet end, and the temperature difference is used to recover the waste heat of the cold air again, thereby reducing the exhaust temperature, improving the utilization rate of thermal energy, and effectively reducing the production cost. It realizes the pollution-free dehydration and drying of sand and gravel using solar energy. The design of the dust collector uses the kinetic energy of air rotation to achieve efficient dust removal.

[0026] The present invention and its implementation methods are described above, which is not restrictive. The drawings are only one of the implementation methods of the present invention, and the actual application is not limited thereto. In short, if ordinary technicians in the field are inspired by it and design application methods and embodiments similar to the technical solution without creativity without departing from the purpose of the invention, they should all fall within the protection scope of the present invention.

Claims

1. A system for drying sand materials using a solar - heated air - supply dryer, characterized in that, it includes: a rotary - kiln - type dryer, and a solar heat - collection and heat - dissipation circulation system, an air - supply system, and an exhaust waste - heat recovery system connected to the rotary - kiln - type dryer. The rotary - kiln - type dryer is used for dehydrating and drying materials. The solar heat - collection and heat - dissipation circulation system includes a vacuum - tube collector for heating cold water, a radiator for heating cold air, and a water pump for providing power for the entire solar heat - collection and heat - dissipation circulation system. The air - supply system includes a heat - dissipation air - storage bin for heating cold air, and an air - supply pipe connecting the heat - dissipation air - storage bin and the rotary - kiln - type dryer. An induced draft fan for providing power for the entire air - supply system is arranged in the air - supply pipe. The exhaust waste - heat recovery system includes a waste - heat recovery device for heating cold air using waste heat. The waste - heat recovery device is sleeved on the cold air pipe; The exhaust waste - heat recovery system further includes an exhaust pipe, a condensate collector, an exhaust port, and a dust collector. One end of the exhaust pipe is connected to the rotary - kiln - type dryer, and the other end is connected to the waste - heat recovery device. It is used to supply the high - moisture - content hot air discharged from the rotary - kiln - type dryer to the waste - heat recovery device; The solar heat - collection and heat - dissipation circulation system further includes a chemical feeder, a makeup water pipe, a high - level makeup water tank, a hot - water storage tank, a radiator water - supply pipe, and a circulating water pipeline. The makeup water pipe is used to supply treated cold water to the high - level makeup water tank. A chemical feeder is arranged on the makeup water pipe. The chemical feeder is used to treat the cold water flowing in the makeup water pipe; The hot - water storage tank is connected to the radiator through the radiator water - supply pipe, and an exhaust valve connected to the waste - heat recovery device is arranged on it. The exhaust valve is used to discharge the excess air in the hot water in the hot - water storage tank to the waste - heat recovery device; The radiator is arranged in the heat - dissipation air - storage bin and is connected to the water pump through a radiator return pipe. The radiator return pipe is arranged in the cold air pipe and is laid along the cold air pipe to the pipe terminal.

2. The system for drying sand materials using a solar - heated air - supply dryer according to claim 1, characterized in that, the rotary - kiln - type dryer includes a rotary body and a feeding port and a discharging port arranged on the rotary body. A hot - air port for connecting to an external air - supply pipe is arranged in the rotary body. It is used to flip the water - containing sand and gravel materials. The feeding port is used to supply the water - containing sand and gravel materials, and the discharging port is used to discharge the dehydrated and dried sand and gravel materials.

3. The system for drying sand materials using a solar - heated air - supply dryer according to claim 1, characterized in that, the high - level makeup water tank is connected to the vacuum - tube collector through a first circulating water pipeline. The vacuum - tube collector includes a plurality of vacuum - tube collectors installed in series, and is connected to the hot - water storage tank through a hot - water pipe.

4. The system for drying sand materials using a solar - heated air - supply dryer according to claim 1, characterized in that, the water pump is used to send the cooled cold water into the high - level makeup water tank through a second circulating water pipeline to form a heat - collection and heat - dissipation circulation.

5. The system for drying sand materials using a solar - heated air - supply dryer according to claim 1, characterized in that, The air supply system further includes a cold air duct sleeved on the radiator return pipe, with one end connected to an air supply outlet and the other end accessing the heat dissipation air bin, which is used to send external cold air into the heat dissipation air bin.

6. A system for drying sand materials using a solar heating air supply dryer according to claim 1, characterized in that a rotary dust collector and a condensate discharge valve connected to the condensate collector are provided on the waste heat recovery device. The condensate discharge valve is used to discharge the condensate generated by the low-temperature gas recovered from the waste heat recovery device from the waste heat recovery device. The dust collector is sleeved on the cold air duct, with one end connected to the waste heat recovery device and the other end connected to an air outlet, which is used to collect dust by using the flowing cold air from the waste heat recovery device to the air outlet.

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