A gas uniform distribution system for nitrogen gas modification of stored grain

Abstract

The utility model discloses a kind of for storing grain nitrogen filling gas regulation gas uniform distribution system, belong to grain storage technical field;It includes: for storing grain storage warehouse body, ground cage suction assembly, nitrogen conveying component and nitrogen circulation component.Ground cage suction assembly is set in the bottom of grain storage warehouse body, to suck the gas in grain storage warehouse body;Nitrogen conveying component includes the first annular distribution pipe being set in the upper portion of grain storage warehouse body and pressure regulating unit;The first annular distribution pipe is set around the inner wall of storage grain, and a plurality of equidistantly arranged gas outlet holes are provided on the first annular distribution pipe;A plurality of pressure regulating units are provided on the first annular distribution pipe;Nitrogen circulation component is respectively connected with the first annular distribution pipe and ground cage suction assembly, to separate nitrogen in the gas from ground cage suction assembly, and discharge from the first annular distribution pipe, form nitrogen circulation in grain.The utility model can ensure that the nitrogen permeation speed of each area is consistent, maintain nitrogen concentration uniform distribution.

Description

Technical Field

[0001] This utility model relates to the field of grain storage technology, and in particular to a gas uniform distribution system for nitrogen-controlled gas filling of grain storage. Background Technology

[0002] Nitrogen-controlled atmosphere storage is an important green grain storage technology. By introducing nitrogen into the grain silo, the oxygen concentration is reduced, inhibiting the growth of pests and mold, and extending the shelf life of the grain. However, existing technologies have the following problems: Traditional nitrogen filling methods (such as single-point nitrogen filling) can easily lead to large nitrogen concentration gradients within the storage chamber, resulting in poor oxygen reduction in some areas. Furthermore, traditional nitrogen filling methods rely on natural diffusion or simple circulation, resulting in slow nitrogen distribution and impacting the controlled atmosphere effect. Utility Model Content

[0003] In view of this, it is necessary to provide a gas uniform distribution system for nitrogen-controlled gas filling in grain storage, so as to solve the problem that single-point nitrogen filling in existing grain warehouses can easily lead to uneven nitrogen distribution.

[0004] This utility model provides a gas uniform distribution system for nitrogen-controlled gas filling in grain storage, comprising: Grain storage silos are used to store grains; A ground cage suction assembly is installed at the bottom of the grain storage silo to suction gas from the grain storage silo. A nitrogen delivery assembly includes a first annular distribution pipe disposed on the upper part of the grain storage silo and a pressure regulating unit; the first annular distribution pipe is disposed around the inner wall of the stored grain, and the first annular distribution pipe is provided with a plurality of equidistant air outlets; a plurality of pressure regulating units are disposed on the first annular distribution pipe to adjust the exhaust speed of the first annular distribution pipe in different sections. The nitrogen circulation component is connected to the first annular distribution pipe and the ground cage suction component, respectively, so as to separate nitrogen from the gas from the ground cage suction component and discharge it from the first annular distribution pipe to form a nitrogen circulation in the grain.

[0005] Furthermore, the pressure regulating unit includes a vertically arranged branch pipe and a valve for adjusting the exhaust speed. One end of the branch pipe is connected to the first annular uniformly distributed pipe, and the other end of the branch pipe is connected to the top space of the grain storage silo. The valve is disposed on the branch pipe, and the valve can adjust the exhaust speed of the first annular uniformly distributed pipe relative to the grain by adjusting the exhaust speed of the branch pipe.

[0006] Furthermore, the branch pipe is connected to the first annular uniformly distributed pipe through a tee connector, and the diameter of the branch pipe is 1 / 3 to 2 / 3 of the diameter of the first annular uniformly distributed pipe.

[0007] Furthermore, the branch pipes are arranged at equal intervals along the length of the first annular uniformly distributed pipe, and each branch pipe can control the exhaust speed of a section of the first annular uniformly distributed pipe.

[0008] Furthermore, the nitrogen delivery assembly also includes a second annular distribution pipe, which is arranged around the inner side of the first annular distribution pipe, and the second annular distribution pipe and the first annular distribution pipe maintain the same distance; the second annular distribution pipe is provided with a plurality of equidistant air outlets, the pressure regulating unit is disposed on the second annular distribution pipe, and the second annular distribution pipe is connected to the nitrogen circulation assembly through a pipe.

[0009] Furthermore, the nitrogen delivery assembly also includes a hoisting unit, which includes a hoisting rope. The two ends of the hoisting rope are respectively connected to the top of the grain storage silo and the second annular uniform distribution pipe to suspend and support the second annular uniform distribution pipe, so that the first annular uniform distribution pipe and the second annular uniform distribution pipe are located on the same plane.

[0010] Furthermore, at least two sets of the second annular uniform distribution tubes are provided, and the second annular uniform distribution tubes are nested between each other.

[0011] Furthermore, the nitrogen delivery assembly also includes a control unit, which includes an oxygen concentration sensor and a controller that are configured one-to-one with each valve. The two ends of the controller are electrically connected to the oxygen concentration sensor and the valve, respectively. The controller can adjust the opening degree of the valve according to the oxygen concentration signal from the oxygen concentration sensor.

[0012] Furthermore, the nitrogen circulation assembly includes a nitrogen generator, the two ends of which are connected to the first annular uniform distribution pipe and the ground cage suction assembly respectively through pipes. The nitrogen generator can separate oxygen from the nitrogen-rich gas in the ground cage suction assembly and deliver the obtained nitrogen to the first annular uniform distribution pipe.

[0013] Furthermore, the ground cage suction assembly includes multiple suction cages disposed at the bottom of the grain storage silo and a fan. The multiple suction cages are arranged in a relatively linear array, and the two ends of the fan are respectively connected to a nitrogen generator and the multiple suction cages through pipes.

[0014] Compared with the prior art, the beneficial effects of this utility model are as follows: (1) The present invention provides a uniform gas distribution system for nitrogen-filled modified atmosphere storage of grain, which includes a nitrogen delivery component. The nitrogen delivery component includes a first annular uniform distribution pipe arranged around the inner wall of the storage silo and a pressure regulating unit. Multiple equidistant air outlets are arranged on the first annular uniform distribution pipe. Each air outlet can uniformly output nitrogen gas, thereby simultaneously filling the grain with nitrogen from multiple points, promoting uniform diffusion of nitrogen gas, and maintaining a relatively uniform nitrogen content in the grain. Multiple pressure regulating units are arranged on the first annular uniform distribution pipe. The exhaust speed of different sections can be adjusted by the pressure regulating units, thereby adjusting the gas output of the air outlets, so that nitrogen gas is uniformly distributed in the grain pile, effectively eliminating the concentration gradient difference caused by traditional methods.

[0015] (2) The present invention provides a uniform gas distribution system for nitrogen-controlled gas filling of grain storage, which is equipped with a nitrogen circulation component. The nitrogen circulation component can recycle the nitrogen-rich gas drawn by the ground cage, separate the excess small amount of oxygen, and re-input the obtained nitrogen into the first annular uniform distribution pipe to form a continuous nitrogen circulation. While reducing the work done by the nitrogen circulation component, the nitrogen content in the grain storage silo is maintained. Attached Figure Description

[0016] The accompanying drawings, which are included to provide a further understanding of the present invention and form part of this application, illustrate exemplary embodiments of the present invention and, together with the description thereof, serve to explain the present invention and do not constitute an undue limitation thereof. In the drawings: Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram of the nitrogen delivery component in this utility model. Figure 1 ; Figure 3 This is a schematic diagram of the nitrogen delivery component in this utility model. Figure 2 .

[0017] In the diagram, 100 is the grain storage silo; 200 is the ground cage suction assembly; 210 is the suction cage; 220 is the blower; 300 is the nitrogen delivery assembly; 310 is the first annular distribution pipe; 311 is the air outlet; 320 is the pressure regulating unit; 321 is the branch pipe; 322 is the valve; 330 is the second annular distribution pipe; 340 is the hoisting unit; 341 is the hoisting rope; 350 is the control unit; 351 is the oxygen concentration sensor; 352 is the controller; 400 is the nitrogen circulation assembly; and 410 is the nitrogen generator. Detailed Implementation

[0018] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, which constitute a part of this application and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not intended to limit the scope of the present invention.

[0019] In existing technologies, when using nitrogen-filled controlled atmosphere storage to reduce oxygen concentration during grain storage, traditional methods typically employ single-point nitrogen filling. This method easily leads to significant differences in nitrogen concentration in different areas of the storage facility; the oxygen concentration drops rapidly in areas near the nitrogen filling port, while the oxygen reduction effect is delayed in areas farther away. Furthermore, nitrogen primarily relies on natural diffusion or simple mechanical circulation for distribution, resulting in an unclear gas flow path and making it difficult to meet actual oxygen reduction requirements.

[0020] This embodiment presents a gas uniform distribution system for nitrogen-controlled gas filling in grain storage, relating to the field of grain storage technology. It actively controls the gas permeation path within the grain pile by combining a ring-shaped distribution structure with zoned pressure regulation. Dynamic pressure balance is achieved through independent pressure regulation in multiple zones, ensuring consistent nitrogen permeation rates across all areas.

[0021] Please see Figures 1 to 3 This embodiment discloses a nitrogen-controlled gas distribution system for grain storage, comprising: a grain storage silo 100, a bottom-mounted suction assembly 200, a nitrogen delivery assembly 300, and a nitrogen circulation assembly 400. The grain storage silo 100 is used to store grain, ensuring its long-term preservation. The bottom-mounted suction assembly 200, located at the bottom of the grain storage silo 100, can draw gas from the bottom of the grain storage silo 100, promoting heat dissipation and gas exchange.

[0022] The nitrogen delivery assembly 300 includes a first annular uniform distribution pipe 310 surrounding the inner wall of the storage silo and a pressure regulating unit 320. Multiple equidistant vents 311 are arranged on the first annular uniform distribution pipe 310, each vent 311 uniformly discharging nitrogen gas outwards. This allows for simultaneous nitrogen filling of the grain at multiple points, promoting uniform nitrogen diffusion and maintaining a relatively uniform nitrogen content in the grain. Multiple pressure regulating units 320 are located on the first annular uniform distribution pipe 310, allowing adjustment of the exhaust speed in different sections, thereby regulating the gas output from the vents 311. This ensures uniform nitrogen penetration and distribution within the grain pile, effectively eliminating concentration gradient differences caused by traditional methods. The nitrogen circulation assembly 400 can recycle nitrogen-rich gas drawn in by the ground cage, separating excess oxygen, and re-introducing the resulting nitrogen into the first annular uniform distribution pipe 310, forming a continuous nitrogen circulation. This reduces the work required by the nitrogen circulation assembly 400 while maintaining the nitrogen content in the grain storage silo 100.

[0023] During operation, the annular distribution pipe arranged at the top of the silo uniformly releases nitrogen gas evenly onto the grain pile surface through multiple vents 311. When gas permeation is obstructed in a localized area due to differences in grain pile density, the exhaust pressure of that section of the annular pipe is changed by adjusting the opening of the valve 322 of the pressure regulating unit 320 branch pipe 321 in the corresponding section, thereby balancing the overall airflow distribution. The bottom suction assembly 200 continuously extracts gas from the bottom of the silo, and after the nitrogen circulation assembly 400 separates the oxygen-enriched gas, the high-purity nitrogen gas is re-transported to the annular distribution pipe, forming a circulation path of top-down permeation and bottom-up recovery.

[0024] In some embodiments, please refer to Figure 1 and Figure 2 The pressure regulating unit 320 includes a vertically arranged branch pipe 321 and a valve 322 for adjusting the exhaust speed. One end of the branch pipe 321 is connected to the first annular uniformly distributed pipe 310, and the other end of the branch pipe 321 is connected to the top space of the grain storage silo 100. The valve 322 is installed on the branch pipe 321 and can adjust the exhaust speed of the vent 311 relative to the grain by adjusting the exhaust speed of the branch pipe 321. Through the synergistic effect of the branch pipe 321 and the valve 322, the exhaust speed can be adjusted in real time according to the oxygen concentration differences in different areas of the grain silo, thereby improving the uniformity of nitrogen penetration in the grain pile and effectively inhibiting the local growth of pests and mold.

[0025] In practical implementation, branch pipe 321 is a pipe structure that vertically connects the annular uniform distribution pipe to the top space of the silo. It can be implemented using metal or plastic pipes, and the first annular uniform distribution pipe 310 is buried in the grain. The function of branch pipe 321 is to establish a gas diversion channel, so that the gas in different sections of the annular uniform distribution pipe can be discharged to the top space of the grain through branch pipe 321.

[0026] Valve 322 is a flow regulating device installed on branch pipe 321. Specifically, it can be implemented by a butterfly valve or a ball valve. Its function is to control the exhaust resistance of the corresponding section of the annular uniformly distributed pipe by adjusting the opening of branch pipe 321, thereby changing the nitrogen release rate of the outlet 311 in that section.

[0027] During operation, branch pipe 321 connects with the annular distribution pipe to form a parallel exhaust path. When the opening of valve 322 decreases, the airflow resistance of branch pipe 321 increases, forcing more nitrogen to be discharged from the outlet 311 of the annular distribution pipe. When the opening of valve 322 increases, the airflow resistance of branch pipe 321 decreases, and the exhaust velocity of the corresponding section of the annular distribution pipe decreases accordingly. By adjusting the opening of valve 322 on different branch pipes 321, the exhaust velocity of each area of ​​the annular distribution pipe can be independently controlled, thereby adapting to the nitrogen distribution requirements of different locations in the grain pile.

[0028] As a further embodiment, branch pipe 321 is connected to the first annular uniform distribution pipe 310 via a tee connector, and the diameter of branch pipe 321 is 1 / 3 to 2 / 3 of the diameter of the first annular uniform distribution pipe 310. By limiting the diameter ratio range of branch pipe 321 and annular uniform distribution pipe, combined with the flow-dividing structure of the tee connector, the pressure distribution of gas in each section of the annular uniform distribution pipe is more balanced, avoiding eddies or backflow caused by sudden changes in pipe diameter.

[0029] In practical implementation, the tee fitting is a pipe fitting with three connection ports. It can be made of metal or plastic to achieve fluid communication between the branch pipe 321 and the annular distribution pipe, ensuring pressure balance during gas diversion.

[0030] The diameter ratio of branch pipe 321 refers to the cross-sectional relationship between branch pipe 321 and the annular uniformly distributed pipe. A reasonable ratio range can be determined through computational fluid dynamics models to control the gas flow distribution ratio between branch pipe 321 and the annular uniformly distributed pipe, avoiding local airflow pressure imbalance caused by excessive pipe diameter differences. Specifically, a tee joint is positioned at a specific location on the annular uniformly distributed pipe, through which branch pipe 321 extends vertically to the top space of the grain silo. The diameter of branch pipe 321 is controlled within a specific proportional range of the diameter of the annular uniformly distributed pipe, for example, 40% or 50% of the diameter, ensuring that branch pipe 321 has sufficient gas throughput while maintaining airflow stability in the main section of the annular uniformly distributed pipe.

[0031] When valve 322 adjusts the exhaust speed of branch pipe 321, the ratio of the diameter of branch pipe 321 to that of the annular uniform distribution pipe can effectively buffer pressure fluctuations and prevent the overall airflow of the annular uniform distribution pipe from becoming turbulent due to sudden changes in local flow velocity.

[0032] In some embodiments, please refer to Figure 1 and Figure 2 Branch pipes 321 are arranged at equal intervals along the length of the first annular uniformly distributed pipe 310, and each branch pipe 321 can control the exhaust speed of a section of the first annular uniformly distributed pipe 310. By arranging the branch pipes 321 at equal intervals, zoned control can be achieved, which can accurately match the aeration characteristics of each area of ​​the grain pile and eliminate the differences in nitrogen distribution caused by uneven grain pile density.

[0033] In practical implementation, the branch pipes 321 are arranged at equal intervals, meaning they are distributed at fixed intervals along the extension direction of the first annular uniform distribution pipe 310. Uniform positioning can be achieved through machining or welding, ensuring consistent gas emission coverage in each area. Each branch pipe 321 controls a segment of the exhaust velocity by adjusting the exhaust flow of the connected local annular pipe segment via a valve 322. This segmental control can be achieved using a solenoid valve, allowing for dynamic adjustment based on nitrogen concentration differences in different sections.

[0034] During operation, the first annular uniform distribution pipe 310 is divided into multiple equal-length segments, each connected to a branch pipe 321. When a high grain density in a certain area increases nitrogen permeation resistance, the exhaust velocity of that segment can be increased by reducing the opening of the valve 322 on the corresponding branch pipe 321, thereby compensating for local gas flow resistance. Conversely, if a loose grain layer in a certain area causes nitrogen diffusion to be too rapid, the exhaust velocity of the corresponding branch pipe 321 is increased to prevent excessive nitrogen loss from the vent 311 in that area. This segmented control mechanism allows the exhaust velocity of the entire annular uniform distribution pipe to achieve dynamic balance according to the actual grain pile condition.

[0035] In some embodiments, please refer to Figure 3 The nitrogen delivery assembly 300 also includes a second annular distribution pipe 330, which is arranged inside the first annular distribution pipe 310, with the same spacing between them. The second annular distribution pipe 330 has multiple equidistant air outlets 311, and a pressure regulating unit 320 is mounted on it. The second annular distribution pipe 330 is connected to the nitrogen circulation assembly 400 via a pipe. By adding the second annular distribution pipe 330 located on the inner side, a bidirectional airflow channel is constructed, allowing nitrogen to permeate simultaneously from both the inner and outer sides of the grain pile, effectively shortening the gas diffusion path. The synergistic effect of the second annular distribution pipe 330 and the first annular distribution pipe 310 on the inner and outer sides eliminates the airflow blind zone in the central area caused by the traditional single-ring pipe layout, ensuring stable nitrogen replenishment in both vertical and horizontal directions throughout the grain pile, thereby quickly establishing a uniform controlled atmosphere environment.

[0036] In practical implementation, the second annular distribution pipe 330 is an annular gas distribution structure nested inside the first annular distribution pipe 310. Specifically, it can be implemented using an annular steel pipe coaxially arranged with the first annular distribution pipe 310. Its function is to form a multi-level annular airflow coverage area to enhance gas penetration uniformity. Simultaneously, the second annular distribution pipe 330 can be implemented by equally dividing the inner diameter of the grain silo, ensuring a complementary distribution of the inner and outer annular airflow coverage areas. The pressure regulating unit 320 is installed on the second annular distribution pipe 330, and its function is to independently control the nitrogen emission rate in the inner annular region.

[0037] In practical implementation, when the nitrogen circulation component 400 is activated, nitrogen is simultaneously input into two sets of inner and outer annular distribution pipes. The first annular distribution pipe 310 forms a ring-shaped airflow band around the periphery of the grain silo, while the second annular distribution pipe 330 establishes a secondary airflow ring in the central area of ​​the grain pile. Both annular pipes release nitrogen synchronously through equidistantly arranged outlet holes 311. The pressure regulating unit 320 adjusts the exhaust velocity of each section of the inner and outer annular pipes according to the oxygen concentration differences in different areas of the grain pile. The synergistic effect of the inner and outer annular pipes allows nitrogen to permeate bidirectionally from both the periphery and the central area of ​​the grain pile, forming a multi-layered, three-dimensional airflow coverage.

[0038] In some embodiments, please refer to Figure 3 The nitrogen delivery assembly 300 includes a hoisting unit 340, which includes a hoisting rope 341. The two ends of the hoisting rope 341 are connected to the top of the grain storage silo 100 and the second annular uniform distribution pipe 330, respectively. By adjusting the length of the hoisting rope 341, the second annular uniform distribution pipe 330 can be suspended and positioned, so that the inner and outer annular uniform distribution pipes form a stable planar cooperative structure, which effectively improves the uniformity of nitrogen diffusion in the grain pile, avoids local high oxygen concentration caused by pipe misalignment, thereby improving the controlled atmosphere efficiency and reducing the risk of pest breeding.

[0039] In the specific implementation process, the hoisting rope 341 is a rope structure used to suspend and fix the second annular uniform distribution pipe 330. It can be made of steel wire rope or high-strength nylon rope. By connecting the top of the silo and the second annular uniform distribution pipe 330 at both ends, it ensures that the annular uniform distribution pipe remains horizontal during the nitrogen filling process.

[0040] The second annular distribution pipe 330 is suspended from the top of the grain storage silo 100 by a hoisting rope 341, and its planar position is aligned with that of the first annular distribution pipe 310. During nitrogen filling, nitrogen is released simultaneously through the first and second annular distribution pipes 310 and 330. Since they are on the same plane, the diffusion path and coverage of nitrogen in the grain pile are uniformly controlled, avoiding airflow interference caused by pipe misalignment. The rigid support of the hoisting rope 341 further prevents the second annular distribution pipe 330 from shifting due to gravity or airflow impact, ensuring that the double-annular structure always maintains the preset layout.

[0041] As a further implementation, at least two sets of the second annular uniform distribution pipes 330 are provided, nested among each other. The nested annular uniform distribution pipes release nitrogen synchronously in multiple stages, making the gas replacement efficiency in the center and edge areas of the storage unit more consistent, effectively shortening the overall deoxygenation time. Simultaneously, the nested annular pipe structure enables rapid and uniform nitrogen penetration into the radial space of the grain pile, significantly improving the control accuracy and stability of oxygen concentration during controlled atmosphere storage.

[0042] It should be noted that the area occupied by a grain storage silo is often large, and the area that the annular uniform distribution pipe can cover is relatively small. A single set of annular uniform distribution pipes cannot meet the requirement of fully covering the grain.

[0043] The nested configuration involves multiple concentrically stacked annular tubes, with a fixed spacing between the outer and inner annular tubes, forming a multi-layered nitrogen release channel. When the nitrogen circulation component 400 simultaneously delivers nitrogen to the nested annular tubes, the outer annular tubes cover the outer area of ​​the grain pile, while the inner annular tubes release nitrogen directly into the central area of ​​the grain pile. The synergistic effect of both eliminates the problem of delayed gas permeation in the central area caused by the traditional single-ring tube structure.

[0044] In some embodiments, please refer to Figure 1 The nitrogen delivery assembly 300 also includes a control unit 350. The control unit 350 includes an oxygen concentration sensor 351 corresponding to each valve 322, and a controller 352. The controller 352 is electrically connected to the oxygen concentration sensor 351 and the valve 322 respectively. The controller 352 can adjust the opening of the valve 322 based on the oxygen concentration signal from the oxygen concentration sensor 351. The control unit 350 can dynamically balance the nitrogen distribution within the grain storage silo 100, eliminating the problem of locally high oxygen concentrations caused by differences in grain density. When the permeability of different areas of the grain pile changes, the control system can automatically adjust the nitrogen delivery intensity of the corresponding area to ensure consistent oxygen reduction efficiency.

[0045] In the specific implementation process, the oxygen concentration sensor 351 is a device used to detect the oxygen concentration in a local area within the grain storage silo 100. Specifically, it can be implemented using an electrochemical sensor or an optical sensor. Its arrangement corresponds to the branch pipe 321 controlled by the valve 322, and it can provide real-time feedback of the oxygen concentration data of the corresponding area.

[0046] The controller 352 is a device that receives sensor signals and outputs control commands. Specifically, it can be implemented using a PLC or an embedded microprocessor. It converts the oxygen concentration signal into an adjustment command for the opening degree of valve 322 through a preset algorithm.

[0047] When the oxygen concentration in a certain area is detected to be higher than the set threshold, the controller 352 sends a command to the valve 322 of the corresponding branch pipe 321 to reduce the opening degree, thereby accelerating the nitrogen discharge speed in that area; conversely, it increases the opening degree to reduce the flow rate.

[0048] The nitrogen circulation assembly 400 includes a nitrogen generator 410. The two ends of the nitrogen generator 410 are connected to a first annular distribution pipe 310 and a ground cage suction assembly 200 via pipes, respectively. The nitrogen generator 410 can separate oxygen from the nitrogen-rich gas in the ground cage suction assembly 200 and deliver the resulting nitrogen to the first annular distribution pipe 310. The nitrogen generator 410 purifies the suction gas with nitrogen and re-injects it into the system, which not only reduces the need for external nitrogen replenishment but also accelerates the diffusion rate of nitrogen within the grain pile through the circulation path, avoiding the problem of uneven local concentration caused by a single nitrogen filling.

[0049] In practical implementation, the nitrogen generator 410 is a device that separates nitrogen and oxygen components in a gas through physical or chemical methods. Specifically, it can be achieved by using membrane separation or pressure swing adsorption technology to separate oxygen from the mixed gas collected by the ground cage suction assembly 200, thereby improving the purity of nitrogen.

[0050] The nitrogen-rich gas is a mixture of gases containing a high concentration of nitrogen extracted from the bottom of the grain storage silo 100 by the ground cage suction component 200. Its oxygen concentration is lower than that of the ambient air but does not reach the target value of controlled atmosphere, and it needs to be further purified by the nitrogen generator 410.

[0051] During operation, the ground cage suction assembly 200 continuously draws gas from the bottom of the grain storage silo 100 to the nitrogen generator 410. The nitrogen generator 410 separates oxygen and nitrogen through its internal separation unit. The separated high-concentration nitrogen is then transported to the first annular uniform distribution pipe 310 and reinjected into the upper layer of the grain pile through its surface-distributed vents 311. In this process, the nitrogen generator 410 not only achieves nitrogen recycling but also reduces nitrogen consumption through a closed-loop system. The gas drawn from the bottom of the grain pile is purified and then re-enters the top of the grain pile, forming a dynamic circulation path that allows nitrogen to diffuse and distribute multiple times within the grain pile.

[0052] The bottom suction assembly 200 includes multiple suction cages 210 disposed at the bottom of the grain storage silo 100 and a fan 220. The multiple suction cages 210 are arranged in a linear array. The two ends of the fan 220 are connected to the multiple suction cages 210 and the nitrogen generator 410 respectively through pipes. Through the linear array of multiple suction cages 210, combined with the linkage of the fan 220 and the nitrogen generator 410, the gas at the bottom is evenly sucked in and circulated, avoiding excessively high local oxygen concentrations.

[0053] In practical implementation, the suction cage 210 is a structure arranged at the bottom of the grain storage silo 100 for suctioning gas. It can be made of metal mesh or perforated plate material to allow gas flow while preventing grain from entering the pipe. Multiple suction cages 210 are arranged equidistantly in a straight line along the bottom of the grain storage silo 100. They can be positioned by fixed brackets to cover a larger suction area.

[0054] The blower 220 is a power device that drives the gas flow. Specifically, a centrifugal blower 220 or an axial flow blower 220 can be used. It is connected to the suction cage 210 and the nitrogen generator 410 through a pipeline to form a gas circulation path.

[0055] During operation, after the blower 220 starts, it simultaneously draws gas from multiple suction cages 210. The nitrogen-rich gas is separated from oxygen by the nitrogen generator 410 and then reinjected into the upper part of the grain storage silo 100, forming a circulating airflow. The linear array arrangement of the suction cages 210 can reduce dead zones in the bottom gas flow and improve the uniformity of gas suction.

[0056] The above description is merely a preferred embodiment of the present utility model, but the scope of protection of the present utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present utility model should be included within the scope of the present utility model.

Claims

1. A gas uniform distribution system for nitrogen-controlled gas filling in grain storage, characterized in that, include: Grain storage silos are used to store grains; A ground cage suction assembly is installed at the bottom of the grain storage silo to suction gas from the grain storage silo. A nitrogen delivery assembly includes a first annular distribution pipe disposed on the upper part of the grain storage silo and a pressure regulating unit; the first annular distribution pipe is disposed around the inner wall of the stored grain, and the first annular distribution pipe is provided with a plurality of equidistant air outlets; a plurality of pressure regulating units are disposed on the first annular distribution pipe to adjust the exhaust speed of the first annular distribution pipe in different sections. The nitrogen circulation component is connected to the first annular distribution pipe and the ground cage suction component, respectively, so as to separate nitrogen from the gas from the ground cage suction component and discharge it from the first annular distribution pipe to form a nitrogen circulation in the grain.

2. The gas uniform distribution system for nitrogen-controlled gas filling of grain storage according to claim 1, characterized in that, The pressure regulating unit includes a vertically arranged branch pipe and a valve for adjusting the exhaust speed. One end of the branch pipe is connected to the first annular uniformly distributed pipe, and the other end of the branch pipe is connected to the top space of the grain storage silo. The valve is installed on the branch pipe, and the valve can adjust the exhaust speed of the first annular uniformly distributed pipe relative to the grain by adjusting the exhaust speed of the branch pipe.

3. A gas uniform distribution system for nitrogen-controlled gas filling in grain storage according to claim 2, characterized in that, The branch pipe is connected to the first annular uniformly distributed pipe through a tee connector, and the diameter of the branch pipe is 1 / 3 to 2 / 3 of the diameter of the first annular uniformly distributed pipe.

4. A gas uniform distribution system for nitrogen-controlled gas filling in grain storage according to claim 3, characterized in that, The branch pipes are arranged at equal intervals along the length of the first annular uniformly distributed pipe, and each branch pipe can control the exhaust speed of a section of the first annular uniformly distributed pipe.

5. A gas uniform distribution system for nitrogen-controlled gas filling in grain storage according to any one of claims 1-4, characterized in that, The nitrogen delivery assembly further includes a second annular distribution pipe, which is arranged inside the first annular distribution pipe and the two annular distribution pipes maintain the same distance. The second annular distribution pipe is provided with a plurality of equidistant air outlets. The pressure regulating unit is disposed on the second annular distribution pipe, and the second annular distribution pipe is connected to the nitrogen circulation assembly through a pipe.

6. A gas uniform distribution system for nitrogen-controlled gas filling in grain storage according to claim 5, characterized in that, The nitrogen delivery assembly also includes a hoisting unit, which includes a hoisting rope. The two ends of the hoisting rope are respectively connected to the top of the grain storage silo and the second annular uniform distribution pipe to suspend and support the second annular uniform distribution pipe, so that the first annular uniform distribution pipe and the second annular uniform distribution pipe are located on the same plane.

7. A gas uniform distribution system for nitrogen-controlled gas filling in grain storage according to claim 6, characterized in that, At least two sets of the second annular uniform distribution tubes are provided, and the second annular uniform distribution tubes are nested between each other.

8. A gas uniform distribution system for nitrogen-controlled gas filling of grain storage according to claim 2, characterized in that, The nitrogen delivery assembly also includes a control unit, which includes an oxygen concentration sensor and a controller that are configured one-to-one with each valve. The two ends of the controller are electrically connected to the oxygen concentration sensor and the valve, respectively. The controller can adjust the opening degree of the valve according to the oxygen concentration signal from the oxygen concentration sensor.

9. A gas uniform distribution system for nitrogen-controlled gas filling in grain storage according to claim 1, characterized in that, The nitrogen circulation assembly includes a nitrogen generator, the two ends of which are connected to the first annular uniform distribution pipe and the ground cage suction assembly through pipes respectively. The nitrogen generator can separate oxygen from the nitrogen-rich gas in the ground cage suction assembly and deliver the obtained nitrogen to the first annular uniform distribution pipe.

10. A gas uniform distribution system for nitrogen-controlled gas filling in grain storage according to claim 1, characterized in that, The ground cage suction assembly includes multiple suction cages disposed at the bottom of the grain storage silo and a fan. The multiple suction cages are arranged in a relatively linear array. The two ends of the fan are respectively connected to a nitrogen generator and multiple suction cages through pipes.

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