阅读说明：本技术 一种筒式仓综合储粮系统 (Barrel type storehouse integrated grain storage system ) 是由 李浩杰 付鹏程 盛强 王松 王健龙 姜祖新 曹志帅 白俊飞 党琦 于 2020-07-17 设计创作，主要内容包括：本发明公开一种筒式仓综合储粮系统,包括与粮仓底部地笼连通的通风口、连通至粮仓内粮堆顶部空间的循环管路以及连通至通风口的用于输送惰性气体的气调管路,通风口与循环管路之间连接有并联的分支管路一和分支管路二,分支管路一上设置了进风口与通风口连通、出风口与循环管路连通的内环流风机,分支管路二上设置有进风口与循环管路连通、出风口与通风口连通的熏蒸风机,还包括与循环管路连通的分支管路三,分支管路三上设置有进风口与循环管路连通、出风口与外界连通的排风机,气调管路、分支管路一、分支管路二和分支管路三上设置有阀门。本发明实现了一体化多功能,便于集中控制,可灵活切换不同功能,能源消耗小,保障储粮质量。(The invention discloses a drum type comprehensive grain storage system for a granary, which comprises a vent communicated with a ground cage at the bottom of the granary, a circulation pipeline communicated to the top space of a grain pile in the granary, and an air-conditioning pipeline communicated to the vent and used for conveying inert gas, wherein a branch pipeline I and a branch pipeline II which are connected in parallel are connected between the vent and the circulation pipeline, an inner circular flow fan is arranged on the branch pipeline I, an air inlet is communicated with the vent, an air outlet is communicated with the circulation pipeline, a fumigation fan is arranged on the branch pipeline II, the fumigation fan is arranged on the air inlet and is communicated with the circulation pipeline, the air outlet is communicated with the vent, a branch pipeline III is communicated with the circulation pipeline, an exhaust fan is arranged on the branch pipeline III, the air inlet is communicated with the circulation pipeline, the air outlet is communicated with the outside, and valves. The invention realizes integrated multifunction, is convenient for centralized control, can flexibly switch different functions, has low energy consumption and ensures the quality of stored grains.)

1. A drum type silo comprehensive grain storage system is characterized by comprising a vent (1) communicated with a ground cage at the bottom of a granary, a circulating pipeline (2) communicated with the top space of a grain pile in the granary and a gas adjusting pipeline (3) used for conveying inert gas, wherein a branch pipeline I (5) and a branch pipeline II (6) which are arranged in parallel are connected between the vent (1) and the circulating pipeline (2), an inner annular flow fan (51) is arranged on the branch pipeline I (5) and provided with an air inlet communicated with the vent (1) and an air outlet communicated with the circulating pipeline (2), a fumigating fan (61) is arranged on the branch pipeline II (6) and provided with an air inlet communicated with the circulating pipeline (2) and an air outlet communicated with the vent (1), the gas adjusting pipeline (3) is communicated with the vent (1), and a branch pipeline III (7) is communicated with the circulating pipeline (2), an exhaust fan (71) with an air inlet communicated with the circulating pipeline (2) and an air outlet communicated with the outside is arranged on the branch pipeline III (7), and valves are respectively arranged on the air adjusting pipeline (3), the branch pipeline I (5), the branch pipeline II (6) and the branch pipeline III (7).

2. The silo-type integrated grain storage system of claim 1, wherein a plurality of the ventilation openings (1) are merged to the collecting pipe (4) through a pipeline, and the branch pipeline I (5) and the branch pipeline II (6) are connected in parallel between the collecting pipe (4) and the circulating pipeline (2).

3. The cylindrical comprehensive granary grain storage system according to claim 2, wherein the pipeline between the ventilation opening (1) and the collecting pipe (4) comprises a ground part and an underground embedded part, and the ground part is provided with an insulating layer.

4. The silo type integrated grain storage system of claim 2, wherein the modified atmosphere pipeline (3) is connected to the collecting pipe (4).

5. The silo type comprehensive grain storage system of claim 1, wherein the branch pipeline III (7) is connected to the branch pipeline II (6).

6. The silo-type integrated grain storage system of any one of claims 1 to 5, wherein the circulating pipeline (2), the branch pipeline I (5) and the branch pipeline II (6) are made of heat-insulating pipelines.

7. The silo type comprehensive grain storage system of claim 6, wherein the heat insulation pipeline adopted by the circulating pipeline (2), the branch pipeline I (5) and the branch pipeline II (6) comprises an inner layer, a middle heat insulation layer and an outer layer which are sequentially arranged from inside to outside along the radial direction, the inner layer is a PVC pipe, and the outer layer is a stainless steel pipe.

8. The silo-type integrated grain storage system of any one of claims 1 to 5, wherein the power of the fumigation fan (61) is less than the power of the inner circulation fan (51).

9. The silo-type integrated grain storage system of any one of claims 1 to 5, wherein the inner circulation fan (51) and the fumigation fan (61) are provided with heat insulation layers.

10. The integrated silo grain storage system of any one of claims 1 to 5 wherein the modified atmosphere line (3) is connected to a nitrogen-producing facility for venting nitrogen to the headspace of the grain heap in the silo.

Technical Field

The invention relates to the technical field of grain storage, in particular to a barrel-type bin comprehensive grain storage system.

Background

Grain storage is the storage management process from grain harvest to grain consumption. Humidity and temperature are key factors of grain storage safety, a traditional granary ventilation system adopts ground cage ventilation or ground groove ventilation, the problem of vertical layering of grain moisture is serious, grain piles in a granary are easy to form a large cold core and an obvious hot skin, the grain temperature at the cold core part of the grain piles can be kept below 15 ℃ for a long time and can be stored safely for a long time, the grain temperature at the top of the grain piles can reach 25-30 ℃, the quality of the grain changes rapidly and is easy to be damaged by insect and mildew, local heating and caking are caused along with the transfer of damp and heat, and even grain surface hardening or grain mildew is caused. In order to ensure the quality of grain storage, systems such as internal circulation temperature control, fumigation, controlled atmosphere storage and the like are usually equipped, each system is an independent system, needs to be independently built, has a complex structure, is difficult to deploy equipment, is difficult to install and maintain, cannot be subjected to centralized control, is difficult to effectively cooperate with each other, has low working efficiency and affects the grain storage effect.

Disclosure of Invention

The invention aims to solve the technical problems and the technical task of improving the prior art, provides a cylindrical bin comprehensive grain storage system, and solves the problems that the functions of systems adopted for grain storage in the prior art are single, the systems are relatively independent and are difficult to effectively cooperate, centralized control cannot be performed, equipment deployment is complicated, difficulty is high, and installation and maintenance are difficult.

In order to solve the technical problems, the technical scheme of the invention is as follows:

a drum-type comprehensive grain storage system for granary is composed of air vents communicated with the ground cage at bottom of granary, circulating pipeline communicated with the top space of granary, and air conditioning pipeline for delivering inert gas, a branch pipeline I and a branch pipeline II which are arranged in parallel are connected between the air vent and the circulating pipeline, the first branch pipeline is provided with an inner circulation fan with an air inlet communicated with the vent and an air outlet communicated with the circulation pipeline, the branch pipeline II is provided with a fumigation fan with an air inlet communicated with the circulating pipeline and an air outlet communicated with the vent, the air-conditioning pipeline is communicated with the vent, the air-conditioning pipeline also comprises a branch pipeline III communicated with the circulating pipeline, the branch pipeline III is provided with an exhaust fan, an air inlet is communicated with the circulating pipeline, an air outlet is communicated with the outside, valves are respectively arranged on the air adjusting pipeline, the branch pipeline I, the branch pipeline II and the branch pipeline III. The drum type comprehensive grain storage system integrates internal circulation temperature control, fumigation and air conditioning storage, can flexibly switch different functions by controlling different pipelines and fans to work according to actual needs, effectively ensures the grain storage quality, can extract cold energy of a cold core of a grain pile and then convey the cold energy to the space in the bin at the top of the grain pile, forms downward airflow in the grain pile, effectively reduces the temperature at the top of the grain pile, has good temperature equalization effect and low energy consumption, can extract fumigation gas in the space at the top of the grain pile and then convey the fumigation gas to the bottom of the grain pile, forms upward airflow in the grain pile, has airflow during fumigation opposite to that during internal circulation temperature control, can reduce the waste of chemicals, reduce the pressure accumulated in the space at the upper part of the grain pile of the fumigation gas, reduce the risk of burning explosion, reduce the fan power required during fumigation, thereby reducing the cost, and can integrate nitrogen, air conditioning and air into a whole, Inert gases such as carbon dioxide let in the bottom of the grain pile from the vent, then take out the air in the grain pile from the space above the top of the grain pile through the circulating line and arrange outward, finally make inert gas full of the grain pile, in order to reach the purposes of controlling insect damage, reducing grain respiration and physiological metabolic strength, etc., the whole system structure is simplified, the integration is multifunctional, the centralized control of being convenient for, can switch over in a flexible way as required, each system can effectively cooperate each other, the work efficiency is high, the system operation is convenient, the installation and maintenance are simple, the energy consumption is little, and the running cost is low.

Furthermore, a plurality of air vents are converged to the collecting pipe through pipelines, and the branch pipeline I and the branch pipeline II are connected between the collecting pipe and the circulating pipeline in parallel. When the internal circulation temperature control is carried out, the cold energy of the cold core of the grain pile can be pumped out through the plurality of ventilation openings and then is conveyed to the space in the bin at the top of the grain pile, the utilization sufficiency and uniformity of the cold energy of the cold core of the grain pile can be improved, and the efficiency of circulation temperature equalization is improved; when carrying out the fumigation, also can let in the bottom of grain heap with the fumigation gas from a plurality of vent simultaneously, improve the fumigation homogeneity to because the fumigation gas enters into the grain heap from bigger region, can reduce the resistance that the fumigation gas flows, thereby only need the fan of less power can maintain and form the air current that stably flows in the grain heap, promptly, the power of required fumigation fan is lower, can reduce system construction cost.

Furthermore, the pipeline between vent and the collecting pipe includes ground part and underground embedded part, and ground part is provided with the heat preservation, reduces the air current and external heat exchange when flowing along the pipeline between vent and the collecting pipe, can reduce the energy consumption of storing up the grain.

Furthermore, the air-conditioning pipeline is connected to the collecting pipe, and when air-conditioning storage is carried out, inert gas is introduced into the bottom of the grain pile from the plurality of air vents simultaneously, so that the uniformity of the inert gas entering the grain pile is improved, the efficiency of reaching a target value of the content of the inert gas in the grain pile is improved, and the processing time is shortened.

Furthermore, the branch pipeline III is connected to the branch pipeline II, so that the structure is compact and the layout is convenient.

Furthermore, the circulating pipeline, the branch pipeline I and the branch pipeline II are made of heat insulation pipelines, so that heat exchange between air flow in the pipelines and the external environment is reduced, the cold energy of the cold core of the grain pile can be better utilized to cool grains at the top of the grain pile, and the grain storage power consumption is reduced.

Further, the heat insulation pipeline that circulation pipeline, branch pipeline one and branch pipeline two adopted include along radially inlayer, middle heat preservation and the skin that sets gradually from inside to outside, the inlayer be the PVC pipe, the skin be nonrust steel pipe, the heat-proof quality is good, reduces the heat exchange, the simple structure of pipeline, intensity height, long service life reduces the maintenance cost.

Furthermore, the power of the fumigation fan is smaller than that of the inner circulation fan, when the inner circulation temperature control is carried out, the downward airflow is inside the grain stack, and when the fumigation is carried out, the upward airflow is inside the grain stack, the fumigation gas can flow upward in the grain stack smoothly and automatically, the uniformity and the sufficiency of the fumigation are better, the waste of the medicament can be reduced, the upward airflow in the grain stack does not need overlarge wind pressure to forcedly push the airflow to flow inside the grain stack, so that the fan power required by stable circulation airflow during the fumigation is lower relative to the airflow direction of the inner circulation temperature control, and the fumigation fan only needs to adopt a fan with the power smaller than that of the inner circulation fan, and the cost can be reduced.

Furthermore, the inner circulation fan and the fumigation fan are provided with heat insulation layers, so that heat exchange between airflow and the external environment at the positions of the inner circulation fan and the fumigation fan is avoided, the cold energy of the cold core of the grain heap can be better utilized to carry out uniform temperature treatment on the grain heap, and the grain storage power consumption is reduced.

Furthermore, the controlled atmosphere pipeline is connected with nitrogen making equipment to lead nitrogen to the top space of the grain pile in the granary, the nitrogen is used for discharging air in the grain pile to achieve an oxygen-poor or oxygen-free environment state, insect pests are controlled to reduce the respiration and physiological metabolic strength of the grains, and the like, and the grain storage quality is effectively improved.

Compared with the prior art, the invention has the advantages that:

the barrel type comprehensive grain storage system of the invention realizes integrated multifunction, is convenient for centralized control, can flexibly switch different functions according to the actual grain storage condition, can independently operate internal circulation temperature control, fumigation and air conditioning storage, effectively ensures the grain storage quality, has high system integration level, convenient implementation, low cost, convenient system operation, simple installation and maintenance, low energy consumption and low operation cost because different functions share one set of pipe network.

Drawings

FIG. 1 is a schematic structural view of a barrel-type silo integrated grain storage system;

FIG. 2 is a schematic diagram of the operation of the internal circulation temperature control;

FIG. 3 is a schematic diagram of the operation of fumigation;

figure 4 is a schematic diagram of the operation of modified atmosphere storage.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

According to the integrated grain storage system for the cylindrical silo disclosed by the embodiment of the invention, one set of pipe network can simultaneously realize multiple functions, the internal circulation temperature control, the fumigation and the air conditioning storage are integrated into a whole, the centralized control is convenient, the systems can effectively cooperate with each other, the working efficiency is high, the energy consumption is low, the operation cost is low, the system structure is simple, the installation and the maintenance are simple, and the system operation is convenient.

As shown in figure 1, the drum type silo comprehensive grain storage system mainly comprises a vent 1 communicated with a ground cage at the bottom of a granary, a circulation pipeline 2 communicated to the headspace of a grain pile in the granary and an air-conditioning pipeline 3 used for conveying inert gas, wherein the circulation pipeline 2 is a pipeline arranged on the outer wall of the granary, the whole body is vertical, the air-conditioning pipeline 3 is introduced into the headspace of the grain pile in the granary from the upper part of the outer wall of the granary, the vent 1 is uniformly arranged at intervals at the bottom of the wall of the drum type granary, two or more than two vent 1 are converged to a collecting pipe 4 through a pipeline, a branch pipeline 5 and a branch pipeline two 6 which are arranged in parallel are connected between the collecting pipe 4 and the circulation pipeline 2, an inner annular flow fan 51 with an air inlet communicated with the vent 1 and an air outlet communicated with the circulation pipeline 2 is arranged on the branch pipeline one 5, and an air inlet communicated with the circulation pipeline 2 is arranged on the branch, The fumigation fan 61 is characterized in that an air outlet is communicated with the vent 1, the air-conditioning pipeline 3 is connected to the collecting pipe 4 and further communicated with the vent 1, the barrel type bin integrated grain storage system is further provided with a branch pipeline III 7 communicated with the circulating pipeline 2, the branch pipeline III 7 is particularly connected to a branch pipeline II 6, the branch pipeline III 7 is communicated with the circulating pipeline 2 through the branch pipeline II 6, and the branch pipeline III 7 is provided with an exhaust fan 71, wherein an air inlet is communicated with the circulating pipeline 2, and an air outlet is communicated with the outside;

the modified atmosphere pipeline 3, the branch pipeline one 5, the branch pipeline two 6 and the branch pipeline three 7 are respectively provided with a valve, specifically, the branch pipeline one 5 is provided with a butterfly valve one 52 positioned on one side of an inlet of the inner circulation fan 51 and a butterfly valve two 53 positioned on one side of an outlet of the inner circulation fan 51, the branch pipeline two 6 is provided with a butterfly valve three 62 positioned on one side of an inlet of the fumigation fan 61 and a butterfly valve four 63 positioned on one side of an outlet of the fumigation fan 61, the branch pipeline three 7 is provided with a butterfly valve five 72 positioned on one side of an inlet of the exhaust fan 71, and the modified atmosphere pipeline 3 is provided with a ball valve 31.

The pipeline between the ventilation opening 1 and the collecting pipe 4 comprises a ground part and an underground embedded part, and the ground part is provided with a heat insulation layer to reduce heat exchange with the outside when airflow flows along the pipeline between the ventilation opening and the collecting pipe; the circulating pipeline 2, the branch pipeline I5 and the branch pipeline II 6 are made of heat insulation pipelines, each heat insulation pipeline comprises an inner layer, an intermediate heat insulation layer and an outer layer which are sequentially arranged from inside to outside along the radial direction, the inner layer is a PVC pipe, the outer layer is a stainless steel pipe, the intermediate heat insulation layer can be a polyurethane foaming layer, the structural strength is high, the service life is long, the heat insulation effect is good, the heat exchange between air flow conveyed along the pipelines and the outside is reduced, and the energy consumption of grain storage is reduced; the branch pipeline III 7 is made of stainless steel pipes, the controlled atmosphere pipeline 3 comprises a ground part and an underground part, the ground part is made of stainless steel pipes, the underground part is made of PPR pipes, the controlled atmosphere pipeline 3 is communicated with nitrogen making equipment, namely, nitrogen is used for controlled atmosphere storage, and the nitrogen generated by the nitrogen making equipment is communicated to the top space of a grain pile in the granary along the controlled atmosphere pipeline 3; the inner circulation fan 51 and the fumigation fan 61 are provided with heat insulation layers, so that heat exchange with the outside during working is reduced, and the utilization sufficiency of the cold quantity of the cold core of the grain pile is improved.

The power of the fumigation fan 61 is less 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, the airflow inside the grain pile is descending airflow during the inner circulation temperature control treatment, and the gas can be pressed into the grain pile and flows downwards only by the larger fan power; when fumigation is carried out, under the action of a fumigation fan 61, fumigation gas in the top space of the grain pile descends along a circulating pipeline, then enters the bottom of the grain pile from an air vent, and finally flows from bottom to top in the grain pile, namely, the gas flow in the grain pile is ascending gas flow, the ascending flow of the gas flow in the grain pile is easier than the descending flow, the required wind pressure is smaller, phosphine is adopted during fumigation, the phosphine has deflagration property, if the gas flow direction which is the same as the temperature of the inner-ring flow control is adopted, the gas pressure at the top of the bin is larger due to the blockage of grains, the energy accumulation of the top of the bin is caused, the bin is easy to deflagrate, the gas tightness of the top of the bin is poorer, the condition that phosphine gas escapes from the top of the bin due to the increase of the gas pressure at the top of the bin can be increased, the waste of chemicals can be caused, the environment is polluted simultaneously, and the gas flow in the grain pile during fumigation, the effect is safe and the efficiency is high;

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, and the controlled atmosphere storage only needs nitrogen to fill the granary and does not need to form continuous flowing stable airflow in the grain bulk, so that the air quantity and the air pressure required by the controlled atmosphere storage are small, and the exhaust fan only needs a low-power fan;

therefore, the power of the fumigation fan 61 and the exhaust fan 71 only needs to be smaller than that of the inner circulation fan 51, so that the construction and implementation cost can be reduced, and the operation power consumption during fumigation and controlled atmosphere storage can also be reduced, in the embodiment, the power of the inner circulation fan 51 is 3Kw, the power of the fumigation fan 61 is 0.75Kw, and the power of the exhaust fan 71 is 0.33 Kw.

Internal circulation temperature control:

in summer, the top of the grain pile is higher in temperature, the bottom and the central area of the grain pile are lower in temperature, the top of the grain pile is cooled by using the cold energy of the cold core of the grain pile, the grain storage quality can be effectively guaranteed, the power consumption required by grain storage is effectively reduced, and when the barrel type bin comprehensive grain storage system is used for internal circulation temperature control, the internal circulation fan 51, the first butterfly valve 52 and the second butterfly valve 53 are started; closing the fumigation fan 61, the exhaust fan 71, the butterfly valve III 62, the butterfly valve IV 63, the butterfly valve V72 and the ball valve 31;

as shown in fig. 2, the cold energy of the cold core of the grain pile is simultaneously pumped out from a plurality of ventilation openings by the inner circulation fan 51, the cold energy is introduced into the circulation pipeline 2 along the path of the collecting pipe and the branch pipeline I and then flows upwards along the circulation pipeline 2, namely, the circulation pipeline 2 is an uplink air flow, then the cold energy is introduced into the top space of the grain pile in the grain bin, then the cold energy enters the top of the grain pile, the top of the grain pile is effectively cooled, negative pressure can be formed at the bottom of the grain pile due to the fact that the inner circulation fan 51 pumps out the air at the bottom of the grain pile, and then top-down air flow is formed inside the grain pile, namely, the down air flow is formed inside the grain pile, and finally, the inner circulation temperature control is realized, the cold energy consumption is reduced while the grain storage quality is ensured, and the energy is saved and the environment is.

Fumigating:

the top surface of the grain pile is coated with the pesticide, the pesticide generates phosphine gas in the space at the top of the grain pile, the top of the grain pile can be covered with a film for sealing, the circulating pipeline 2 is communicated to the space between the top of the grain pile and the film, the top surface of the grain pile under the film is coated with the pesticide, and the pesticide generates phosphine gas in the space between the top of the grain pile and the film;

when the cylindrical silo comprehensive grain storage system is used for phosphine circulation fumigation, the fumigation fan 61, the butterfly valve III 62 and the butterfly valve IV 63 are started; closing the inner annular flow fan 51, the first butterfly valve 52, the second butterfly valve 53, the exhaust fan 71, the fifth butterfly valve 72 and the ball valve 31;

as shown in fig. 3, phosphine gas above the top of the grain pile is pumped out along the circulation pipeline 2 by the fumigation fan 61, so that the phosphine gas flows downwards along the circulation pipeline 2, namely, downward air flow is in the circulation pipeline 2, then the phosphine gas enters the collecting pipe 4 through the branch pipeline two 6, then the phosphine gas is divided into a plurality of ventilation openings and enters the bottom of the grain pile in the grain bin, the phosphine gas flows from bottom to top in the grain pile, namely, upward air flow is in the grain pile, the phosphine gas fully kills the grains when flowing through the grain pile, the upward air flow can improve the uniform sufficiency of fumigation, finally the phosphine gas flows upwards to the space above the top of the grain pile, circulation fumigation is realized, the circulation fumigation mode in the air flow direction effectively avoids the fumigation gas from accumulating in the space above the grain pile to cause the risk of burning explosion, and also effectively avoids the fumigation gas from escaping due to overlarge pressure accumulated in the space above the grain pile, reduce the waste of medicament and avoid causing environmental pollution.

Modified atmosphere storage:

nitrogen is introduced into a grain pile of the grain bin, the oxygen content in the grain bin is manually adjusted to achieve the aims of lacking oxygen or oxygen, preventing the metabolic activity of harmful organisms, controlling the breeding and spreading of insect pests, inhibiting the propagation of mold, reducing the respiration and physiological metabolic strength of grains and delaying the ageing of the quality of the grains;

when the air-conditioned storage is carried out by using the integrated grain storage system of the cylindrical silo, the exhaust fan 71, the butterfly valve five 72, the butterfly valve three 62 and the ball valve 31 are started; closing the inner annular flow fan 51, the first butterfly valve 52, the second butterfly valve 53, the fumigation fan 61 and the fourth butterfly valve 63;

as shown in fig. 4, a mode of lower inflation and upper gap exhaust is adopted, nitrogen generated by nitrogen making equipment is introduced into a collecting pipe along an air-conditioning pipeline 3, then is divided into a plurality of air vents from the collecting pipe 4 and then simultaneously enters the bottom of a grain stack in a grain bin, air in the grain stack is upwards extruded out of the top surface of the grain stack by the nitrogen and enters a space above the top of the grain stack, the air flows along a path of a circulating pipeline 2, a branch pipeline two 6 and a branch pipeline three 7 under the action of an exhaust fan 71 and is finally outwards exhausted by the exhaust fan 71, so that the nitrogen enters the grain stack and replaces the air, the purposes of controlling insect pests, reducing the breathing and physiological metabolic strength of the grain and the like are achieved, specifically, the nitrogen generated by the nitrogen making equipment is firstly introduced into the grain bin from the air vents at the bottom of the grain bin, at the moment, the exhaust fan 71 does not work firstly, outwards drafts and exhausts air, when the air pressure in the grain, the exhaust fan 71 starts to work again to exhaust gas from the top of the granary, in the exhaust process, nitrogen is continuously introduced into the granary, when the air pressure in the granary is reduced to be about 50Pa higher than the external air pressure, the exhaust fan 71 stops exhausting, the above processes are repeated until the concentration of the nitrogen in the granary reaches a target value, the exhaust fan and a ball valve on the air-conditioning pipeline are closed to finish the whole inflation process, and when the concentration of the nitrogen is lower than a preset minimum value, the complete process is carried out in time, so that the grain storage quality is guaranteed.

The inner circulation fan, the fumigation fan, the exhaust fan, the first butterfly valve, the second butterfly valve, the third butterfly valve, the fourth butterfly valve, the fifth butterfly valve, the ball valve and the like of the barrel type comprehensive grain storage system are controlled by the main controller in a centralized mode, the switching operation of the inner circulation temperature control, the fumigation, the air-conditioned storage and the water-retaining and ventilation functions in winter can be automatically realized according to the environmental conditions and the grain storage conditions after the parameters are set, the automation degree is high, manual intervention is not needed, and the manual labor intensity is reduced.

The above is only a preferred embodiment of the present invention, and it should be noted that the above preferred embodiment should not be considered as limiting the present invention, and the protection scope of the present invention should be subject to the scope defined by the claims. It will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the spirit and scope of the invention, and these modifications and adaptations should be considered within the scope of the invention.