Granary spray cooling and ventilation cooling system for high-temperature and high-humidity area

Abstract

The utility model discloses a granary spray cooling and ventilation cooling system for a high-temperature and high-humidity area, which comprises a ground cage, a grain air cooler, a control unit, a spray unit, an air supply pipeline and an air return pipeline, the grain air cooler is arranged on the air supply pipeline close to the upper grain bin, the air inlet of the air supply pipeline is divided into two paths, the first path is communicated with the outside through a fresh air pipe, and the second path is connected with the air return pipeline through an air return branch; the spraying unit comprises a water tank, a circulating water pump, a mist making machine and a spraying cooling box, the water tank, the circulating water pump, the mist making machine and the spraying cooling box are sequentially connected end to end through pipelines to form a spraying circulation loop, and the spraying cooling box is connected to the air supply pipeline in series and located on the air inlet side of the grain air cooler. The spraying unit is used for cooling inlet air of the grain air cooler, the temperature of the inlet air can be reduced by about 10 DEG C, then energy consumption of the grain air cooler is greatly reduced, the energy-saving effect is remarkable, and the ventilation cooling efficiency of the granary is improved.

Description

Technical Field

[0001] The utility model relates to the field of grain storage, in particular to a spray cooling ventilation and temperature reduction system for grain bins in high-temperature and high-humidity areas. Background Art

[0002] As an important facility for storing grain, a grain bin needs to maintain the quality and safety of the grain during the storage process. Among them, the grain temperature is an important factor affecting the grain quality, and ventilating and cooling the grain bin is an important technical means to ensure the safety of stored grain and reduce the loss of stored grain. However, for high-temperature and high-humidity areas in China (especially in summer), the fresh air temperature in the grain bin ventilation system is high and the humidity is high, and a cooling device with a large power is required to meet the ventilation requirements of the grain bin. The mechanical ventilation time is long and the system energy consumption is high. In addition, the ventilation of grain bins in high-temperature and high-humidity areas in southern China generally cannot be recycled, which further increases the energy consumption of the grain bin ventilation and temperature reduction system. Therefore, how to reduce the ventilation and cooling energy consumption of grain bins in high-temperature and high-humidity areas and improve the cooling efficiency is crucial for grain storage in high-temperature and high-humidity areas. Summary of the Invention

[0003] In view of this, the utility model provides a spray cooling ventilation and temperature reduction system for grain bins in high-temperature and high-humidity areas, which can not only greatly reduce the energy consumption of the grain cooling fan, but also improve the cooling efficiency of the grain bin.

[0004] To achieve the above object, the utility model adopts the following technical solutions:

[0005] The spray cooling ventilation and temperature reduction system for grain bins in high-temperature and high-humidity areas of the utility model includes a floor cage and a grain cooling fan arranged in the grain bin; it also includes a control unit, a spray unit, a air supply pipeline connected to the floor cage, and a return air pipeline connected to the return air outlet of the grain bin. The return air outlet is located at the upper part of the grain bin; the grain cooling fan is arranged on the air supply pipeline close to the upper part of the grain bin, and the air inlet of the air supply pipeline is divided into two paths. The first path is communicated with the outside through a fresh air pipe, and the second path is connected to the return air pipeline through a return air branch; a protective net is arranged at the fresh air outlet of the fresh air pipe; a first valve is arranged at the inlet of the fresh air pipe, a second valve is arranged on the return air branch, and a third valve is arranged at the exhaust outlet of the return air pipeline;

[0006] The spray unit includes a water tank, a circulating water pump, a fog generator, and a spray cooling box. The water tank, the circulating water pump, the fog generator, and the spray cooling box are connected end to end through pipelines to form a spray circulation loop. The spray cooling box is connected in series on the air supply pipeline and is located on the air inlet side of the grain cooling fan;

[0007] The control unit includes a controller, a fresh air temperature sensor disposed at the inlet of the fresh air duct, a supply air temperature sensor disposed at the air outlet of the grain cooling fan, and a return air temperature sensor disposed at the air return opening of the return air pipeline. The signal output ends of the fresh air temperature sensor, the supply air temperature sensor, and the return air temperature sensor are connected to the signal input end of the controller, and the control input ends of the grain cooling fan, the circulating water pump, and the fog-making machine are all connected to the control output end of the controller.

[0008] The beneficial effects are as follows: The present utility model uses the spray unit to cool the incoming air of the grain cooling fan, which can reduce the incoming air temperature by about 10 °C, thereby greatly reducing the energy consumption of the grain cooling fan and having a remarkable energy-saving effect; the ventilation and cooling time of the grain bin is not affected by the high-temperature outdoor air in summer, improving the ventilation and cooling efficiency of the grain bin;

[0009] When the return air temperature of the grain bin is lower than the outdoor temperature, the return air can be sent into the spray cooling box for cooling and then sent back into the grain bin, thereby improving the cooling efficiency of the grain bin and reducing energy consumption; when the present utility model is actually working, it can be flexibly adjusted according to the temperature detected by the temperature sensor, thereby realizing the temperature control of the grain bin.

[0010] Preferably, a dehumidification unit is provided on the air supply pipeline between the spray cooling box and the grain cooling fan. More preferably, the dehumidification unit includes a humidity sensor and a cooling and dehumidifying machine. The beneficial effect is that when the humidity of the low-temperature air coming out of the spray cooling box exceeds the set value, the cooling and dehumidifying machine can be used to dehumidify the high-humidity low-temperature air, thereby ensuring the safety of the grain on the basis of ensuring the ventilation and cooling effect.

[0011] Preferably, a plurality of nozzles vertically upward are provided at the lower part of the spray cooling box, that is, the air passing through is cooled by the spray method from bottom to top. Description of the Drawings

[0012] Figure 1 is a schematic structural diagram of the present utility model.

[0013] Figure 2 is a schematic circuit block diagram of the present utility model. Detailed Embodiments

[0014] The following will describe in detail the embodiments of the present utility model with reference to the drawings. The present embodiment is implemented on the premise of the technical solution of the present utility model, and the detailed implementation manners and specific operation processes are given, but the protection scope of the present utility model is not limited to the following embodiments.

[0015] It should be noted that in the description of the present utility model, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations.

[0016] In the description of the present utility model, unless otherwise clearly specified and defined, the terms "connected" and "coupled" that may appear should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be a direct connection or an indirect connection through an intermediate medium, and it may be the communication inside two components. For those skilled in the art, the specific meanings of the above terms in the present utility model can be understood through specific situations.

[0017] As Figure 1-2 shown, the grain bin spray cooling, ventilation and temperature reduction system for high temperature and high humidity areas of the present utility model includes a floor cage 2 (located at the lower part of the grain bin 1), a grain cooler 3, a control unit, a spray unit, a air supply pipeline 4 connected to the floor cage 2, and a return air pipeline 5 connected to the return air outlet of the grain bin 1. The return air outlet is located at the upper part of the grain bin 1; the grain cooler 3 is arranged on the air supply pipeline 4 of the upper grain bin 1, and the air inlet of the air supply pipeline 4 is divided into two paths. The first path is communicated with the outside through a fresh air pipe, which can ventilate the grain bin 1 to supplement outdoor fresh air; the second path of the air inlet of the air supply pipeline 4 is connected to the return air pipeline 5 through a return air branch 6. When the return air temperature is lower than the outdoor room temperature, the return air can be used for ventilation cooling to realize the full utilization of the return air; protective nets are arranged at the fresh air inlet of the fresh air pipe and the exhaust outlet of the return air pipe to prevent leaves or birds from entering the grain bin during ventilation; a first valve F1 is arranged at the inlet of the fresh air pipe, a second valve F2 is arranged on the return air branch 6, and a third valve F3 is arranged at the exhaust outlet of the return air pipeline 5;

[0018] The spray unit includes a water tank 7.1, a circulation water pump 7.2, a fog generator 7.3 (preferably a dry fog generator), and a spray cooling box 7.4. The water tank 7.1, the circulation water pump 7.2, the fog generator 7.3, and the spray cooling box 7.4 are sequentially connected end to end through pipelines to form a spray circulation loop. The spray cooling box 7.4 is connected in series on the air supply pipeline 4 and the spray cooling box 7.4 is located on the air inlet side of the grain cooler 3, so as to cool the air inlet of the grain cooler 3;

[0019] The control unit includes a controller, a fresh air temperature sensor T1 (for monitoring the fresh air temperature) provided at the inlet of the fresh air duct, a supply air temperature sensor T2 (for monitoring the supply air temperature entering the grain bin) provided at the outlet of the grain cooling fan 3, a return air temperature sensor T3 (for monitoring the return air temperature from the grain bin) provided at the air return opening of the return air duct 5, and an exhaust air temperature sensor T4 (for monitoring the exhaust air temperature of the return air duct) provided at the exhaust opening of the return air duct 5. The signal output ends of the fresh air temperature sensor T1, the supply air temperature sensor T2, the return air temperature sensor T3, and the exhaust air temperature sensor T4 are connected to the signal input end of the controller. The control input ends of the grain cooling fan 3, the circulation water pump 7.2, and the fog generator 7.3, as well as the control input ends of the first valve F1, the second valve F2, and the third valve F3, are all connected to the control output end of the controller. The ratio of fresh air and return air can be adjusted by controlling the states of the first valve F1, the second valve F2, and the third valve F3.

[0020] During operation, the outdoor fresh air first enters the spray cooling box 7.4, is cooled for the first time, then enters the grain cooling fan 3, and after being cooled by the grain cooling fan 3 for the second time, enters the floor ducts 2 in the grain bin 1. The return air is discharged through the return air duct 5; when the temperature detected by the return air temperature sensor T3 reaches a certain value, the third valve F3 is closed and the second valve F2 is opened, so that the return air enters the spray cooling box 7.4 through the return air branch 6. The fresh air and the return air are mixed and cooled in the spray cooling box 7.4, then enter the grain bin 1 through the grain cooling fan 3, and return to the spray cooling box 7.4 after coming out of the grain bin 1. In this way, ventilation and cooling of the grain bin 1 are achieved.

[0021] During the operation of the system, the circulation water pump 7.2 provides power for the water circulation, uses the fog generator 7.3 to atomize water, and sends the atomized water vapor into the spray cooling box 7.4 to cool the passing air; the condensed water in the spray cooling box 7.4 enters the water tank 7.1 again. In this way, continuous spraying is achieved, thereby meeting the ventilation and cooling requirements in summer. Among them, to meet the air spray cooling requirements, the circulation water pump 7.2 and the water tank 7.1 are installed at a certain depth underground to ensure that the temperature of the circulating water is below 20°C, thereby meeting the spray cooling requirements of fresh air or mixed air; during the operation of the system, the grain cooling fan 3 provides power for the ventilation cycle, uses the temperature sensor to monitor the temperature, and controls the opening and closing of the first valve F1, the second valve F2, and the third valve F3 according to the temperature to adjust the ratio of fresh air and return air, so that the supply air temperature is not higher than 80% of the exhaust air temperature.

[0022] The utility model cools the incoming air of the grain cooling fan 3 by using a spray unit, which can reduce the incoming air temperature by about 10°C, thereby greatly reducing the energy consumption of the grain cooling fan 3 and achieving remarkable energy-saving effects. It enables the ventilation and cooling time of the grain bin 1 to be unaffected by the high outdoor temperature in summer, improving the ventilation and cooling efficiency of the grain bin 1. When the return air temperature of the grain bin 1 is lower than the outdoor temperature, the return air can be sent to the spray cooling box 7.4 for cooling and then sent back to the grain bin 1, thereby improving the cooling efficiency of the grain bin 1 and reducing energy consumption. When the utility model is actually working, it can be flexibly adjusted according to the temperature detected by the temperature sensor, thus realizing the temperature control of the grain bin 1.

[0023] Combined with Figure 1 It can be seen that a plurality of vertically upward nozzles 7.5 are arranged in the spray cooling box 7.4. The nozzles 7.5 are connected to the fog-making machine 7.3, and the nozzles 7.5 are located at the lower part of the spray cooling box 7.4. The utility model cools the air entering the spray cooling box 7.4 by using a spray method from bottom to top, reducing the temperature of the outdoor air passing through the spray cooling box 7.4 by 10°C to 15°C and reducing the incoming air temperature of the grain cooling fan 3.

[0024] Taking a standard large flat-roofed grain bin 1 as an example, it needs to be equipped with three 100kW grain cooling fans 3. Using traditional mechanical ventilation, using the grain cooling fan 3 to reduce the outdoor air temperature from 35°C to 18°C and send it into the grain bin 1, it takes 7 to 15 days of mechanical ventilation to reduce the grain temperature to 25°C. Using the scheme of the utility model, using the spray unit to reduce the outdoor air temperature from 35°C to below 25°C, reducing the incoming air temperature of the grain cooling fan 3 from 35°C to below 25°C, greatly reducing the incoming air temperature of the grain cooling fan 3, thereby reducing the energy consumption of the grain cooling fan 3. The energy consumption of the grain cooling fan 3 can be reduced by more than 58%, and the new power of the whole system is less than 15kW, making the energy consumption of the whole system can be reduced by more than 55%, reducing the ventilation and cooling energy consumption of the large flat-roofed grain bin 1 and achieving remarkable energy-saving effects.

[0025] Combined with Figure 1-2 It can be seen that a dehumidification unit is arranged on the air supply pipeline 4 between the spray cooling box 7.4 and the grain cooling fan 3. The dehumidification unit includes a humidity sensor 8.1 and a dehumidifying and cooling machine 8.2. The signal output end of the humidity sensor 8.1 is connected to the signal input end of the controller, and the control input end of the dehumidifying and cooling machine 8.2 is connected to the control output end of the controller. When the humidity of the low-temperature air coming out of the spray cooling box 7.4 is too high, the dehumidifying and cooling machine 8.2 can be used to dehumidify the high-humidity low-temperature air first, thereby ensuring grain safety.

[0026] It should be noted that the controller of the present utility model can be a general-purpose processor, a special-purpose processor, a conventional processor, a digital signal processor (DSP), multiple microprocessors, one or more microprocessors associated with the DSP core, a controller, a microcontroller, an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA) circuit, any other type of integrated circuit (IC), and a state machine, etc.

[0027] The controller of the present utility model can also be a programmable logic controller (i.e., PLC), and can also be an industrial control computer with computing attributes and characteristics, which can have a computer CPU, a hard disk, a memory, peripherals and interfaces, and has an operating system, a control network and protocol, computing capabilities, and a friendly human-machine interface.

[0028] Furthermore, the controller can also be provided with a wireless communication module to realize connection with a remote terminal, receive control instructions from the remote terminal, and can also feedback relevant parameters of the real-time working state.

[0029] Finally, it should be emphasized that the above description is only the preferred embodiment of the present utility model and is not used to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still make modifications to the technical solutions described in the foregoing embodiments without creative efforts, or make equivalent replacements for some of the technical features. Therefore, any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A grain silo spray cooling ventilation and temperature reduction system for high temperature and high humidity areas, comprising a ground cage and a grain cooling fan arranged in the grain silo, characterized in that: It also includes a control unit, a spray unit, an air supply pipeline connected to the ground cage, and a return air pipeline connected to the return air outlet of the granary, wherein the return air outlet is located at the upper part of the granary; the grain cooling fan is arranged on the air supply pipeline close to the upper granary, and the air inlet of the air supply pipeline is divided into two paths, the first path is connected to the outside through the fresh air pipe, and the second path is connected to the return air pipeline through the return air branch; a protective net is arranged at the fresh air outlet of the fresh air pipe; a first valve is arranged at the inlet of the fresh air pipe, a second valve is arranged on the return air branch, and a third valve is arranged at the exhaust outlet of the return air pipeline; The spray unit includes a water tank, a circulating water pump, a fog machine, and a spray cooling box. The water tank, the circulating water pump, the fog machine, and the spray cooling box are connected end to end through pipelines to form a spray circulation loop. The spray cooling box is connected in series on the air supply pipeline, and the spray cooling box is located on the air inlet side of the valley cooling fan. The control unit includes a controller, a fresh air temperature sensor arranged at the inlet of the fresh air duct, a supply air temperature sensor arranged at the air outlet of the valley cooling fan, and a return air temperature sensor arranged at the return air outlet of the return air duct. The signal output ends of the fresh air temperature sensor, the supply air temperature sensor and the return air temperature sensor are connected to the signal input end of the controller, and the control input ends of the valley cooling fan, the circulating water pump and the fog making machine are all connected to the control output end of the controller.

2. The grain silo spray cooling ventilation and temperature reduction system for high temperature and high humidity areas according to claim 1 is characterized by: A dehumidification unit is arranged on the air supply pipeline between the spray cooling box and the valley cooling fan.

3. The grain silo spray cooling ventilation and temperature reduction system for high temperature and high humidity areas according to claim 2 is characterized in that: The dehumidification unit includes a humidity sensor and a cooling dehumidifier.

4. The grain silo spray cooling ventilation and temperature reduction system for high temperature and high humidity areas according to claim 1 is characterized in that: The lower part of the spray cooling box is provided with a plurality of nozzles pointing vertically upward.

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