A silo integrated grain storage system

Abstract

The present invention discloses a barrel-type silo integrated grain storage system, including a vent connected to a ground cage at the bottom of the silo, a circulation pipeline connected to the top space of a grain pile in the silo, and a gas-conditioning pipeline connected to the vent for conveying inert gas, a branch pipeline 1 and a branch pipeline 2 connected in parallel are connected between the vent and the circulation pipeline, an inner circulation fan whose air inlet is connected to the vent and the air outlet is connected to the circulation pipeline is arranged on the branch pipeline 1, a fumigation fan whose air inlet is connected to the circulation pipeline and the air outlet is connected to the vent is arranged on the branch pipeline 2, and also includes a branch pipeline 3 connected to the circulation pipeline, an exhaust fan whose air inlet is connected to the circulation pipeline and the air outlet is connected to the outside is arranged on the branch pipeline 3, and valves are arranged on the gas-conditioning pipeline, the branch pipeline 1, the branch pipeline 2 and the branch pipeline 3. The present invention realizes integrated multi-function, is convenient for centralized control, can flexibly switch different functions, has low energy consumption, and ensures the quality of stored grain.

Description

Technical Field

[0001] The present invention relates to the technical field of grain storage, and in particular to a barrel silo integrated grain storage system. Background Art

[0002] Grain storage is the storage management process from the time grain is harvested to before it is consumed. Humidity and temperature are key factors in grain storage safety. Traditional grain storage ventilation systems use ground cage ventilation or ground trough ventilation. The vertical stratification of grain moisture is serious, and the grain pile in the grain storage is prone to form a large cold core and obvious hot skin. The grain temperature in the cold core of the grain pile can be kept below 15°C for a long time, and can be stored safely for a long time, while the grain temperature at the top of the grain pile will reach 25°C to 30°C. The grain quality changes rapidly and is easily damaged by insects and mildew. The transfer of moisture and heat causes local heating and agglomeration, and even causes grain surface hardening or grain mildew. In order to ensure the quality of stored grain, internal circulation temperature control, fumigation, and controlled atmosphere storage systems are usually equipped. Each system is an independent system and needs to be built separately. The structure is complex, the equipment deployment is difficult, the installation and maintenance are difficult, and centralized control cannot be performed. It is difficult for the systems to cooperate effectively, and the work efficiency is low, which affects the grain storage effect. Summary of the invention

[0003] The technical problems to be solved and the technical tasks proposed by the present invention are to improve the existing technology and provide a cylindrical silo comprehensive grain storage system to solve the problems in the current technology that the system functions used for grain storage are single, each system is relatively independent and difficult to effectively coordinate, and centralized control cannot be performed, the equipment deployment is complicated and difficult, and the installation and maintenance are difficult.

[0004] In order to solve the above technical problems, the technical solution of the present invention is:

[0005] A comprehensive grain storage system for a cylindrical silo, comprising a ventilation port connected to a ground cage at the bottom of the silo, a circulation pipeline connected to the space above a grain pile in the silo, and a gas-conditioning pipeline for conveying inert gas, wherein a branch pipeline 1 and a branch pipeline 2 arranged in parallel are connected between the ventilation port and the circulation pipeline, an inner circulation fan whose air inlet is connected to the ventilation port and whose air outlet is connected to the circulation pipeline is arranged on the branch pipeline 1, a fumigation fan whose air inlet is connected to the circulation pipeline and whose air outlet is connected to the ventilation port is arranged on the branch pipeline 2, the gas-conditioning pipeline is connected to the ventilation port, and further comprises a branch pipeline 3 connected to the circulation pipeline, a branch pipeline 3 is provided with an exhaust fan whose air inlet is connected to the circulation pipeline and whose air outlet is connected to the outside, and valves are arranged on the gas-conditioning pipeline, the branch pipeline 1, the branch pipeline 2 and the branch pipeline 3, respectively. The barrel silo comprehensive grain storage system described in the present invention integrates internal circulation temperature control, fumigation and gas-controlled storage into one, and can flexibly switch different functions by controlling different pipelines and fan operations according to actual needs, effectively ensuring the quality of stored grain, and can extract the cold energy of the cold core of the grain pile and transport it to the silo space at the top of the grain pile, forming a downward airflow inside the grain pile, effectively lowering the temperature at the top of the grain pile, with good temperature uniformity and low energy consumption. The fumigation gas in the space at the top of the grain pile can also be extracted and transported to the bottom of the grain pile, forming an upward airflow inside the grain pile. The airflow during fumigation is opposite to the airflow during internal circulation temperature control, which can reduce the waste of medicines and reduce the fumigation gas in the upper space of the grain pile. The pressure accumulated in the grain pile can be reduced, the risk of combustion and explosion can be reduced, and the fan power required for fumigation can be reduced, thereby reducing costs. Inert gases such as nitrogen and carbon dioxide can be introduced into the bottom of the grain pile from the vent, and then the air in the grain pile can be extracted from the space above the top of the grain pile through the circulation pipeline. Finally, the inert gas fills the grain pile to achieve the purpose of controlling pests, reducing grain respiration and physiological metabolic intensity. The entire system has a streamlined structure, realizes integration and multi-functions, is easy to control centrally, can be flexibly switched according to needs, and each system can effectively cooperate with each other, with high work efficiency, convenient system operation, simple installation and maintenance, low energy consumption and low operating cost.

[0006] Furthermore, a plurality of ventilation openings are joined to a confluence pipe through pipelines, and the branch pipeline 1 and the branch pipeline 2 are connected in parallel between the confluence pipe and the circulation pipeline. When performing internal circulation temperature control, the cold energy of the cold core of the grain pile can be extracted through several ventilation holes at the same time and then transported to the warehouse space on the top of the grain pile, which can improve the utilization and uniformity of the cold energy of the cold core of the grain pile and improve the efficiency of circulating temperature equalization. The traditional solution extracts cold energy from a part of the cold core of the grain pile to cool the grain on the top of the grain pile, which has low cooling efficiency for the grain on the top of the grain pile, causing local heat and local coldness in the cold core of the grain pile, and failing to fully utilize the cold energy of the cold core of the grain pile. When fumigating, the fumigation gas can also be introduced into the bottom of the grain pile from several ventilation holes at the same time to improve the uniformity of fumigation. Moreover, since the fumigation gas enters the grain pile from a larger area, the resistance to the flow of the fumigation gas can be reduced, so that only a smaller power fan is needed to maintain a stable airflow in the grain pile, that is, the required fumigation fan has a lower power, which can reduce the system construction cost.

[0007] Furthermore, the pipeline between the vent and the conduit includes a ground part and an underground pre-buried part, and the ground part is provided with an insulation layer to reduce heat exchange between the airflow and the outside when flowing along the pipeline between the vent and the conduit, thereby reducing energy consumption in grain storage.

[0008] Furthermore, the gas-controlled pipeline is connected to the manifold, and during gas-controlled storage, inert gas is simultaneously introduced into the bottom of the grain pile from a plurality of ventilation holes, thereby improving the uniformity of the inert gas entering the grain pile, improving the efficiency of the inert gas content in the grain pile reaching the target value, and shortening the processing time.

[0009] Furthermore, the branch pipeline three is connected to the branch pipeline two, which has a compact structure and is easy to layout.

[0010] Furthermore, the circulation pipeline, branch pipeline 1 and branch pipeline 2 are made of insulated pipes, which reduce the heat exchange between the airflow in the pipeline and the external environment, and can better utilize the cold energy of the cold core of the grain pile to cool the grain on the top of the grain pile, thereby reducing the power consumption of grain storage.

[0011] Furthermore, the insulated pipes used in the circulation pipeline, branch pipeline one and branch pipeline two include an inner layer, a middle insulation layer and an outer layer arranged in sequence from the inside to the outside along the radial direction. The inner layer is a PVC pipe, and the outer layer is a stainless steel pipe. It has good insulation performance and reduces heat exchange. The pipe has a simple structure, high strength, long service life, and reduced maintenance costs.

[0012] Furthermore, the power of the fumigation fan is smaller than that of the inner circulation fan. When the inner circulation temperature control is performed, there is a downward airflow inside the grain pile, and when fumigation is performed, there is an upward airflow inside the grain pile. The fumigation gas can automatically flow upward more smoothly inside the grain pile, and the fumigation is more uniform and sufficient, which can reduce the waste of medicines. The upward airflow in the grain pile does not require excessive wind pressure to force the airflow to flow inside the grain pile. Therefore, the fan power required to form a stable circulating airflow during fumigation is lower than the airflow direction of the inner circulation temperature control. Therefore, the fumigation fan only needs to use a fan with a power smaller than that of the inner circulation fan, which can reduce costs.

[0013] Furthermore, the inner circulation fan and fumigation fan are provided with a heat insulation layer to prevent the airflow from exchanging heat with the external environment at the inner circulation fan and fumigation fan, and can better utilize the cold energy of the cold core of the grain pile to evenly treat the temperature of the grain pile, thereby reducing the power consumption of grain storage.

[0014] Furthermore, the gas conditioning pipeline is connected to the nitrogen production equipment to pass nitrogen to the top space of the grain pile in the granary, and the nitrogen is used to discharge the air in the grain pile to achieve an oxygen-deficient or anaerobic environment, control pests, reduce grain respiration and physiological metabolic intensity, etc., and effectively improve the quality of stored grain.

[0015] Compared with the prior art, the present invention has the following advantages:

[0016] The cylindrical silo comprehensive grain storage system described in the present invention realizes integration and multi-functions, is convenient for centralized control, and can flexibly switch different functions according to actual grain storage conditions. Internal circulation temperature control, fumigation and controlled atmosphere storage can all be operated independently to effectively ensure the quality of stored grain. Different functions share a set of pipe networks, and the system has high system integration, is easy to implement and low in cost. The system is easy to operate, simple to install and maintain, has low energy consumption and low operating cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural diagram of the silo integrated grain storage system;

[0018] Figure 2 This is the working schematic diagram of the internal circulation temperature control;

[0019] Figure 3 This is a working diagram during fumigation;

[0020] Figure 4 This is a working diagram of controlled atmosphere storage. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] The embodiment of the present invention discloses a cylindrical silo comprehensive grain storage system, in which a set of pipe network can realize multiple functions simultaneously, and integrates internal circulation temperature control, fumigation and controlled atmosphere storage into one, which is convenient for centralized control, and each system can effectively cooperate with each other, with high working efficiency, low energy consumption, low operating cost, streamlined system structure, simple installation and maintenance, and convenient system operation.

[0023] like Figure 1 As shown, a cylindrical silo comprehensive grain storage system mainly includes a ventilation hole 1 connected to the bottom cage of the silo, a circulation pipeline 2 connected to the top space of the grain pile in the silo, and a gas-conditioning pipeline 3 for conveying inert gas. The circulation pipeline 2 is a pipeline arranged on the outer wall of the silo, and the whole is vertical. The gas-conditioning pipeline 3 passes from the upper part of the outer wall of the silo to the top space of the grain pile in the silo. A plurality of ventilation holes 1 are evenly spaced at the bottom of the silo wall, and two or more of the ventilation holes 1 are merged into a manifold 4 through a pipeline. A branch pipeline 1 5 and a branch pipeline 2 6 arranged in parallel are connected between the manifold 4 and the circulation pipeline 2. The branch pipeline 1 5 is provided with an inner circulation fan 51 whose air inlet is connected to the ventilation port 1 and whose air outlet is connected to the circulation pipeline 2; the branch pipeline 2 6 is provided with a fumigation fan 61 whose air inlet is connected to the circulation pipeline 2 and whose air outlet is connected to the ventilation port 1; the gas conditioning pipeline 3 is connected to the confluence pipe 4 and further connected to the ventilation port 1; the cylindrical silo comprehensive grain storage system is further provided with a branch pipeline 3 7 connected to the circulation pipeline 2; the branch pipeline 3 7 is specifically connected to the branch pipeline 2 6; the branch pipeline 3 7 is connected to the circulation pipeline 2 through the branch pipeline 2 6; the branch pipeline 3 7 is provided with an exhaust fan 71 whose air inlet is connected to the circulation pipeline 2 and whose air outlet is connected to the outside;

[0024] The gas conditioning pipeline 3, branch pipeline 1 5, branch pipeline 2 6 and branch pipeline 3 7 are respectively provided with valves. Specifically, a butterfly valve 1 52 located on the inlet side of the internal circulation fan 51 and a butterfly valve 2 53 located on the outlet side of the internal circulation fan 51 are provided on the branch pipeline 1 5, a butterfly valve 3 62 located on the inlet side of the fumigation fan 61 and a butterfly valve 4 63 located on the outlet side of the fumigation fan 61 are provided on the branch pipeline 2 6, a butterfly valve 5 72 located on the inlet side of the exhaust fan 71 is provided on the branch pipeline 3 7, and a ball valve 31 is provided on the gas conditioning pipeline 3.

[0025] The pipeline between the vent 1 and the manifold 4 includes a ground part and an underground pre-buried part. The ground part is provided with a heat-insulating layer to reduce the heat exchange between the airflow and the outside when the airflow flows along the pipeline between the vent and the manifold; the circulation pipeline 2, branch pipeline 1 5 and branch pipeline 2 6 are made of insulated pipes, and the insulated pipes include an inner layer, an intermediate heat-insulating layer and an outer layer which are arranged radially from the inside to the outside in sequence. The inner layer is a PVC pipe, the outer layer is a stainless steel pipe, and the intermediate heat-insulating layer can be a polyurethane foam layer, which has high structural strength, long service life, and good heat-insulating effect. The effect is to reduce the heat exchange between the airflow transported along the pipeline and the outside world, and reduce the energy consumption of grain storage; the branch pipeline 3 7 adopts stainless steel pipes, the gas-controlled pipeline 3 includes a ground part and an underground part, the ground part adopts stainless steel pipes, and the underground part adopts PPR pipes. The gas-controlled pipeline 3 is connected to the nitrogen making equipment, that is, nitrogen is used for gas-controlled storage, and the nitrogen generated by the nitrogen making equipment is passed along the gas-controlled pipeline 3 to the top space of the grain pile in the granary; the internal circulation fan 51 and the fumigation fan 61 are provided with a heat insulation layer to reduce the heat exchange with the outside world during operation and improve the utilization of the cold core of the grain pile.

[0026] The power of the fumigation fan 61 is smaller than that of the inner circulation fan 51. The airflow direction during the inner circulation temperature control treatment is opposite to that during the fumigation treatment. During the inner circulation temperature control treatment, the airflow inside the grain pile is a downward airflow, and a larger fan power is required to press the gas into the grain pile and flow downward. During fumigation, under the action of the fumigation fan 61, the fumigation gas in the top space of the grain pile flows downward along the circulation pipeline, then enters the bottom of the grain pile from the vent, and finally flows from bottom to top in the grain pile, that is, the airflow inside the grain pile is an upward airflow. The upward flow inside the grain pile is easier than the downward flow, and the required wind pressure is smaller. Phosphine is used in fumigation, which is explosive. If the same airflow direction as the internal circulation temperature control is used, the air pressure on the top of the silo will be higher due to the obstruction of the grain, causing energy accumulation on the top of the silo, which is easy to explode, and the air tightness of the silo is poor. The increase in the air pressure on the top of the silo will increase the situation of phosphine gas escaping from the top of the silo, which will cause a waste of medicine and pollute the environment. Therefore, the airflow inside the grain pile during fumigation is upward, and the uniformity and sufficiency of fumigation are better, the effect is safe, and the efficiency is high.

[0027] The power of the exhaust fan 71 is also smaller than that of the inner circulation fan 51. The exhaust fan 71 is used for controlled atmosphere storage. Controlled atmosphere storage only requires nitrogen to fill the granary, and does not require a continuous and stable airflow to be formed in the grain pile. Therefore, the air volume and air pressure required for controlled atmosphere storage are small, and the exhaust fan only needs a low-power fan.

[0028] Therefore, the fumigation fan 61 and the exhaust fan 71 only need to use a power smaller than that of the internal circulation fan 51, which can reduce the construction implementation cost and also reduce the operating power consumption during fumigation and controlled atmosphere storage. In this embodiment, the power of the internal circulation fan 51 is 3Kw, the power of the fumigation fan 61 is 0.75Kw, and the power of the exhaust fan 71 is 0.33Kw.

[0029] Internal circulation temperature control:

[0030] In summer, the temperature at the top of the grain pile is higher, while the temperature at the bottom and center of the grain pile is lower. Using the coldness of the cold core of the grain pile to cool the top of the grain pile can effectively ensure the quality of stored grain and effectively reduce the power consumption required for grain storage. When the above-mentioned cylindrical silo comprehensive grain storage system is used for internal circulation temperature control, the internal circulation fan 51, butterfly valve 1 52 and butterfly valve 2 53 are turned on; the fumigation fan 61, exhaust fan 71, butterfly valve 3 62, butterfly valve 4 63, butterfly valve 5 72 and ball valve 31 are turned off;

[0031] like Figure 2 As shown, the cold energy of the cold core of the grain pile is simultaneously extracted from several vents by the internal circulation fan 51, and the cold energy is passed into the circulation pipeline 2 along the path of the confluence pipe and the branch pipeline 1, and then flows upward along the circulation pipeline 2, that is, there is an upward airflow in the circulation pipeline 2, and then the cold energy is passed into the top space of the grain pile in the granary, and then the cold energy enters the top of the grain pile, effectively cooling the top of the grain pile. Since the internal circulation fan 51 extracts the air at the bottom of the grain pile, a negative pressure will be formed at the bottom of the grain pile, and then a top-down airflow is formed inside the grain pile, that is, there is a downward airflow inside the grain pile, and finally the internal circulation temperature control is realized, and the cold energy of the cold core of the grain pile is used to cool the top of the grain pile, thereby ensuring the quality of stored grain while reducing energy consumption, saving energy and protecting the environment.

[0032] Fumigation:

[0033] Apply pesticides on the top of the grain pile, and the pesticides produce phosphine gas in the space above the grain pile. A film may also be covered on the top of the grain pile for sealing. The circulation pipeline 2 is connected to the space between the top of the grain pile and the film. Apply pesticides on the top of the grain pile under the film, and the pesticides produce phosphine gas in the space between the top of the grain pile and the film.

[0034] When the above-mentioned cylindrical silo integrated grain storage system is used for phosphine circulation fumigation, the fumigation fan 61, butterfly valve three 62 and butterfly valve four 63 are turned on; the inner circulation fan 51, butterfly valve one 52, butterfly valve two 53, exhaust fan 71, butterfly valve five 72 and ball valve 31 are turned off;

[0035] like Figure 3As shown, the phosphine gas above the top of the grain pile is extracted along the circulation pipeline 2 by the fumigation fan 61, so that the phosphine gas flows downward along the circulation pipeline 2, that is, there is a downward airflow in the circulation pipeline 2, and then the phosphine gas enters the confluence pipe 4 through the branch pipeline 2 6, and then is diverted to a number of vents and enters the bottom of the grain pile in the granary, and the phosphine gas then flows from bottom to top inside the grain pile, that is, there is an upward airflow inside the grain pile, and the phosphine gas fully kills insects when flowing through the grain pile. The upward airflow can improve the uniformity and sufficiency of fumigation, and finally the phosphine gas flows upward to the space above the top of the grain pile, realizing circulating fumigation. This circulating fumigation method with this airflow direction effectively avoids the risk of explosion caused by the accumulation of fumigation gas in the upper space of the grain pile, and also effectively avoids the accumulation of fumigation gas in the upper space of the grain pile due to excessive pressure and escape, thereby reducing the waste of agents and avoiding environmental pollution.

[0036] Controlled atmosphere storage:

[0037] Introduce nitrogen into the grain pile in the granary, artificially adjust the oxygen content in the granary to achieve hypoxia or anaerobic, prevent the metabolic activities of harmful organisms, and achieve the purpose of controlling the breeding and spread of pests, inhibiting the reproduction of mold, reducing the respiration and physiological metabolism intensity of grains, and delaying the aging of grain quality;

[0038] When the aforementioned cylindrical silo integrated grain storage system is used for controlled atmosphere storage, the exhaust fan 71, butterfly valve five 72, butterfly valve three 62 and ball valve 31 are turned on; the inner circulation fan 51, butterfly valve one 52, butterfly valve two 53, fumigation fan 61 and butterfly valve four 63 are turned off;

[0039] like Figure 4As shown, the mode of lower inflation and upper gap exhaust is adopted. The nitrogen generated by the nitrogen making equipment is introduced into the manifold along the gas conditioning pipeline 3, and then is branched from the manifold 4 to several vents and simultaneously enters the bottom of the grain pile in the granary. The air in the grain pile is squeezed upward by the nitrogen to the top surface of the grain pile and enters the space above the top of the grain pile. Under the action of the exhaust fan 71, the air flows along the path of the circulation pipeline 2, the branch pipeline 2 6 and the branch pipeline 3 7, and is finally discharged outward by the exhaust fan 71, so that the nitrogen enters the grain pile and replaces the air, thereby achieving the purpose of controlling pests, reducing the respiration and physiological metabolic intensity of grains, etc. Specifically, the nitrogen making equipment generates The nitrogen is first introduced into the granary from the ventilation hole at the bottom of the granary. At this time, the exhaust fan 71 does not work to draw air outward. When the air pressure in the granary reaches about 250Pa higher than the external air pressure, the exhaust fan 71 starts working again to discharge the gas from the top of the granary. During the exhaust process, nitrogen continues to be introduced into the granary. When the air pressure in the granary drops to about 50Pa higher than the external air pressure, the exhaust fan 71 stops exhausting. The above process is repeated until the nitrogen concentration in the grain pile reaches the target value. The exhaust fan and the ball valve on the gas conditioning pipeline are closed to end the entire inflation process. When the nitrogen concentration is lower than the preset minimum value, it is replenished in time to ensure the quality of stored grain.

[0040] The internal circulation fan, fumigation fan, exhaust fan, butterfly valve one, butterfly valve two, butterfly valve three, butterfly valve four, butterfly valve five, ball valve, etc. of the cylindrical silo comprehensive grain storage system are centrally controlled by the main controller. After setting the parameters, the internal circulation temperature control, fumigation, controlled atmosphere storage and winter water conservation and ventilation functions can be automatically switched according to the environmental conditions and grain storage conditions. It has a high degree of automation, does not require manual intervention, and reduces labor intensity.

[0041] The above are only preferred embodiments of the present invention. It should be noted that the above preferred embodiments should not be regarded as limiting the present invention, and the protection scope of the present invention should be based on the scope defined by the claims. For ordinary technicians in this technical field, several improvements and modifications can be made without departing from the spirit and scope of the present invention, and these improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A silo integrated grain storage system, characterized in that: The invention comprises a ventilation port (1) connected to a cage at the bottom of a granary, a circulation pipeline (2) connected to the space at the top of a grain pile in the granary, and a gas conditioning pipeline (3) for conveying inert gas. A branch pipeline 1 (5) and a branch pipeline 2 (6) arranged in parallel are connected between the ventilation port (1) and the circulation pipeline (2). An internal circulation fan (51) is arranged on the branch pipeline 1 (5), the air inlet of which is connected to the ventilation port (1) and the air outlet of which is connected to the circulation pipeline (2). The branch pipeline 2 (6) is provided with a A fumigation fan (61) is provided with an air inlet connected to a circulation pipeline (2) and an air outlet connected to a ventilation port (1); the gas conditioning pipeline (3) is connected to the ventilation port (1); and further comprises a branch pipeline three (7) connected to the circulation pipeline (2); the branch pipeline three (7) is provided with an exhaust fan (71) whose air inlet is connected to the circulation pipeline (2) and whose air outlet is connected to the outside; and valves are provided on the gas conditioning pipeline (3), the branch pipeline one (5), the branch pipeline two (6) and the branch pipeline three (7); A plurality of ventilation openings (1) are connected to a manifold (4) through pipelines, the branch pipeline 1 (5) and the branch pipeline 2 (6) are connected in parallel between the manifold (4) and the circulation pipeline (2), the gas conditioning pipeline (3) is connected to the manifold (4), and the branch pipeline 3 (7) is connected to the branch pipeline 2 (6); By adopting the method of lower inflation and upper gap exhaust, the nitrogen generated by the nitrogen production equipment is introduced into the manifold (4) along the gas conditioning pipeline (3), and then is branched from the manifold (4) to a plurality of ventilation ports (1) and simultaneously enters the bottom of the grain pile in the granary. The air in the grain pile is squeezed upwards out of the top surface of the grain pile by the nitrogen and enters the space above the top of the grain pile. Under the action of the exhaust fan (71), the air flows along the path of the circulation pipeline (2), the branch pipeline 2 (6) and the branch pipeline 3 (7), and is finally discharged to the outside by the exhaust fan (71).

2. The silo integrated grain storage system according to claim 1 is characterized in that: The pipeline between the vent (1) and the manifold (4) comprises a ground portion and an underground pre-buried portion, and the ground portion is provided with a thermal insulation layer.

3. The silo integrated grain storage system according to claim 1 or 2, characterized in that: The circulation pipeline (2), branch pipeline one (5) and branch pipeline two (6) are made of heat-insulating pipes.

4. The silo integrated grain storage system according to claim 3 is characterized in that: The heat-insulating pipes used in the circulation pipeline (2), branch pipeline one (5) and branch pipeline two (6) include an inner layer, an intermediate insulation layer and an outer layer which are arranged in sequence from the inside to the outside along the radial direction. The inner layer is a PVC pipe and the outer layer is a stainless steel pipe.

5. The silo integrated grain storage system according to claim 1 or 2, characterized in that: The power of the fumigation fan (61) is smaller than the power of the inner circulation fan (51).

6. The silo integrated grain storage system according to claim 1 or 2, characterized in that: The inner circulation fan (51) and the fumigation fan (61) are provided with a heat insulation layer.

7. The silo integrated grain storage system according to claim 1 or 2, characterized in that: The gas conditioning pipeline (3) is connected to the nitrogen production equipment to pass the nitrogen to the top space of the grain pile in the granary.

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