A nitrogen generator specifically designed for grain storage

Abstract

This utility model discloses a nitrogen generator specifically for grain storage, comprising a base on which a refrigerated compressed air dryer, an air buffer tank, a pressure swing adsorption (PSA) nitrogen generator, and a nitrogen buffer tank are mounted. The refrigerated compressed air dryer has a high-efficiency oil remover at its front end and a precision filter at its rear end. The precision filter is connected to the air buffer tank at its rear end, and the air buffer tank is connected to the PSA nitrogen generator at its rear end. Nitrogen gas produced by the nitrogen generator enters the nitrogen buffer tank through a top outlet pipe. A nitrogen detection system is located at the rear end of the nitrogen buffer tank, with a qualified nitrogen emission port and a vent port at its rear end. This utility model features a compact structure, easy mobility, online nitrogen detection, and good gas production stability, and can be widely used in the field of high-purity nitrogen supply technology for grain storage.

Description

Technical Field

[0001] This utility model belongs to the technical field of adsorption nitrogen generation equipment, specifically relating to a nitrogen generator for grain storage. Background Technology

[0002] In recent years, with the continuous and steady growth of my country's total grain output, various grain management departments have actively and effectively constructed a large number of highly mechanized grain silos to increase grain circulation and alleviate storage capacity shortages. Grain silos are characterized by space saving, large grain storage capacity, and simple and durable structure. They require periodic introduction of high-concentration nitrogen gas to maintain a constant nitrogen concentration inside, creating a low-oxygen environment unfavorable to the growth and reproduction of grain pests and microorganisms. This prevents grain pests from damaging the grain, inhibiting their growth and reproduction until they suffocate and die, while also inhibiting the physiological respiration of the grain and delaying its aging. Compared to the shortcomings of traditional chemical fumigation methods, nitrogen-controlled atmosphere storage poses no harm to the stored grain or the health of workers, making it a green, environmentally friendly, safe, economical, and effective storage technology.

[0003] Nitrogen gas in vertical silos is produced by a nitrogen generator and supplied to the well-sealed silo via nitrogen delivery pipelines, maintaining a high nitrogen concentration for extended periods. For example, patent application number "201220529373.4" discloses a nitrogen generation device for grain storage and preservation, mainly comprising an air compressor, an air dryer, an air separation nitrogen generator, and a nitrogen storage tank. The air compressor is connected to the air inlet of the air dryer, the air outlet of the air dryer is connected to the air inlet of the air separation nitrogen generator, and the air outlet of the air separation nitrogen generator is connected to the air inlet of the nitrogen storage tank. This device features a simple structure and low operating costs. However, this nitrogen generation device requires independent on-site installation, has a long service life, is inconvenient to move, and is not convenient for nitrogen concentration detection. Therefore, existing nitrogen generation equipment specifically for grain storage needs further improvement. Utility Model Content

[0004] The purpose of this invention is to overcome the shortcomings of the existing technology and provide a nitrogen generator for grain storage. It features a compact structure, easy mobility, online nitrogen detection, and good gas production stability, and can be widely used in the field of high-purity nitrogen supply technology for grain storage.

[0005] To achieve the above objectives, this utility model adopts the following technical solution: a nitrogen generator specifically for grain storage, comprising a base, on which a refrigerated compressed air dryer, an air buffer tank, a pressure swing adsorption (PSA) nitrogen generator, and a nitrogen buffer tank are mounted; the refrigerated compressed air dryer has a set of high-efficiency oil removers at its front end and a set of precision filters at its rear end; the high-efficiency oil removers and the precision filters are connected to the refrigerated compressed air dryer via pipelines to filter and purify the incoming compressed gas, obtaining clean compressed air of qualified quality; the rear end of the precision filters is connected to the air buffer tank, and the rear end of the air buffer tank is connected to the PSA nitrogen generator; the clean compressed air enters from the bottom of the PSA nitrogen generator, and after being diffused by a multi-layer stainless steel air diffuser, the air enters the adsorption tower evenly for oxygen and nitrogen adsorption separation, and the prepared nitrogen enters the nitrogen buffer tank from the top outlet pipeline; the rear end of the nitrogen buffer tank is equipped with a nitrogen detection system, and the rear end of the nitrogen detection system is respectively equipped with a qualified nitrogen discharge port and a vent port.

[0006] As an improvement, the base is a one-piece structure with crossbars in the upper section and forklift holes on the bottom side.

[0007] As an improvement, the forklift holes are square holes, and there are four in total, with two on each side symmetrically distributed.

[0008] As an improvement, the air buffer tank is provided with a first drain ball valve at the bottom.

[0009] As an improvement, the pressure swing adsorption nitrogen generator includes a pressure swing adsorption separation tower and a PLC control cabinet.

[0010] As an improvement, the pressure swing adsorption separation tower has two side by side and is filled with adsorption molecular sieves.

[0011] As an improvement, the PLC control cabinet is located between the two pressure swing adsorption separation towers and is equipped with a PLC control system inside. The surface of the control cabinet is also equipped with a touch screen.

[0012] As an improvement, a second drain ball valve is provided at the bottom of the nitrogen buffer tank.

[0013] As an improvement, a nitrogen emission control valve is provided at the front end of the qualified nitrogen emission port, and a nitrogen venting control valve is provided at the front end of the venting port.

[0014] The beneficial effects of this utility model are as follows: A nitrogen generator specifically designed for grain storage features a compact structure, easy mobility, online nitrogen detection, and good gas production stability. By integrating the refrigerated compressed air dryer, air buffer tank, pressure swing adsorption nitrogen generator, and nitrogen buffer tank onto an integrated base, the entire unit can be easily moved, saving the time and effort of on-site installation and shortening the commissioning cycle of the nitrogen generator. The nitrogen buffer tank ensures that the nitrogen concentration requirements of the terminal silo are met at any time, maintaining a consistently high nitrogen concentration inside the silo to satisfy on-site nitrogen usage requirements. Furthermore, a nitrogen detection system installed at the rear of the nitrogen buffer tank continuously monitors the delivered nitrogen concentration. If the nitrogen concentration fails to meet the specified requirements, the molecular sieve can be replaced promptly, preventing adverse effects on grain storage inside the silo. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of the nitrogen generator for grain storage of this utility model;

[0016] Figure 2 This is a partially enlarged schematic diagram of the nitrogen generator for grain storage according to this utility model;

[0017] Figure 3 This is a flowchart illustrating the working process of the nitrogen generator specifically designed for grain storage.

[0018] In the diagram: 1. Base, 2. Refrigerated compressed air dryer, 3. Air buffer tank, 4. Pressure swing adsorption nitrogen generator, 5. Nitrogen buffer tank, 6. High-efficiency oil remover, 7. Precision filter, 8. Nitrogen detection system, 9. Qualified nitrogen discharge port, 10. Vent port, 11. Forklift hole, 12. First drain ball valve, 13. Touch screen, 14. Second drain ball valve, 15. Nitrogen emission control valve, 16. Nitrogen vent control valve, 17. PLC control cabinet. Detailed Implementation

[0019] The preferred embodiments of this utility model will now be described in detail with reference to the accompanying drawings.

[0020] like Figure 1As shown in the figure, a nitrogen generator for grain storage in this embodiment includes a base 1, on which a refrigerated compressed air dryer 2, an air buffer tank 3, a pressure swing adsorption (PSA) nitrogen generator 4, and a nitrogen buffer tank 5 are mounted. The refrigerated compressed air dryer 2 has a set of high-efficiency oil removers 6 at its front end and a set of precision filters 7 at its rear end. The high-efficiency oil removers 6 and the precision filters 7 are connected to the refrigerated compressed air dryer 2 via pipelines to filter and purify the incoming compressed gas, obtaining clean compressed air of qualified quality. The rear end of the precision filters 7 is connected to the air buffer tank 3, and the rear end of the air buffer tank 3 is connected to the PSA nitrogen generator 4. Clean compressed air enters from the bottom of the PSA nitrogen generator 4, and after being diffused by a special multi-layer stainless steel air diffuser, the air enters the adsorption tower evenly for oxygen and nitrogen adsorption separation. The prepared nitrogen gas enters the nitrogen buffer tank 5 from the top outlet pipeline. The rear end of the nitrogen buffer tank 5 is equipped with a nitrogen detection system 8, and the rear end of the nitrogen detection system 8 is respectively equipped with a qualified nitrogen emission port 9 and a vent port 10.

[0021] Furthermore, the base 1 is an integral structure with crossbars in the upper section and forklift holes 11 on the bottom side; specifically, the forklift holes 11 are square holes, and there are four in total, with two on each side symmetrically distributed, so as to facilitate the insertion of forklift forks to lift and move the entire nitrogen generator.

[0022] Furthermore, the bottom of the air buffer tank 3 is provided with a first drain ball valve 12. Specifically, the first drain ball valve 12 is used to discharge oil and impurities inside the air buffer tank to keep the inside of the air buffer tank clean.

[0023] Furthermore, the pressure swing adsorption (PSA) nitrogen generator 4 includes a PSA separation tower and a PLC control cabinet 17. Specifically, there are two PSA separation towers arranged side by side, and the towers are filled with adsorption molecular sieves to achieve nitrogen and oxygen separation. More specifically, the PLC control cabinet 17 is located between the two PSA separation towers and is equipped with a PLC control system. The surface of the control cabinet is also equipped with a touch screen 13, which controls the start and stop of the entire nitrogen generator. The touch screen 13 can also be used to set the detection concentration value and adjust the flow rate.

[0024] Furthermore, the nitrogen buffer tank 5 is provided with a second drain ball valve 14 at the bottom, through which oil and impurities inside the nitrogen buffer tank are discharged to keep the inside of the nitrogen buffer tank clean.

[0025] Furthermore, a nitrogen emission control valve 15 is provided at the front end of the qualified nitrogen emission port 9, and a nitrogen venting control valve 16 is provided at the front end of the vent port 10. Specifically, the nitrogen emission control valve 15 independently controls the delivery of nitrogen and can also adjust the flow rate of the nitrogen process, and can be used to shut off in an emergency; the nitrogen venting control valve 16 independently controls the venting of nitrogen, and can vent the nitrogen inside the nitrogen buffer tank when the nitrogen is unqualified.

[0026] This utility model of a nitrogen generator specifically designed for grain storage features a compact structure, easy mobility, online nitrogen detection, and stable nitrogen production. Its specific working principle is as follows: Compressed air first enters a set of high-efficiency oil removers 6, a refrigerated compressed air dryer 2, and a set of precision filters 7 to remove most of the oil, water, and dust, resulting in clean compressed air of qualified quality. Then, the clean compressed air enters an air buffer tank 3, and after buffering, it enters a pressure swing adsorption (PSA) nitrogen generator 4, which in turn enters two PSA separation towers filled with nitrogen-generating molecular sieves. The compressed air enters from the bottom of the adsorption towers, and the airflow is diffused by a special multi-layer stainless steel air diffuser before evenly entering the adsorption towers. The two adsorption towers operate alternately, continuously supplying raw material air and continuously producing qualified nitrogen. The qualified nitrogen enters a nitrogen buffer tank 5 through a top pipeline for buffering, balancing the nitrogen pressure and purity. After being detected by a nitrogen detection system 8, the qualified nitrogen is then discharged through a qualified nitrogen discharge port 9 and supplied to a well-sealed vertical silo via a nitrogen delivery pipeline.

[0027] Finally, it should be noted that the above examples are merely specific embodiments of this utility model. Obviously, this utility model is not limited to the above embodiments and can have many variations. All variations that can be directly derived or conceived by those skilled in the art from the disclosure of this utility model should be considered within the protection scope of this utility model.

Claims

1. A nitrogen generator specifically for grain storage, comprising a base (1), characterized in that, The base (1) is equipped with a refrigerated compressed air dryer (2), an air buffer tank (3), a pressure swing adsorption nitrogen generator (4), and a nitrogen buffer tank (5); the refrigerated compressed air dryer (2) has a set of high-efficiency oil removers (6) at the front end and a set of precision filters (7) at the rear end; the high-efficiency oil removers (6) and the precision filters (7) are connected to the refrigerated compressed air dryer (2) through pipelines to filter and purify the incoming compressed gas to obtain clean compressed air of qualified quality; the precision filters (7) are connected to the refrigerated compressed air dryer (2) at the rear end. The air buffer tank (3) is connected to the air buffer tank (3), and the rear end of the air buffer tank (3) is connected to the pressure swing adsorption nitrogen generator (4). Clean compressed air enters from the bottom of the pressure swing adsorption nitrogen generator (4). After the air is diffused by a multi-layer stainless steel air diffuser, it enters the adsorption tower evenly for oxygen and nitrogen adsorption separation. The prepared nitrogen enters the nitrogen buffer tank (5) from the top outlet pipe. The nitrogen buffer tank (5) is equipped with a nitrogen detection system (8) at the rear end. The nitrogen detection system (8) is equipped with a qualified nitrogen discharge port (9) and a vent port (10) at the rear end.

2. The nitrogen generator for grain storage according to claim 1, characterized in that, The base (1) is an integral structure with crossbars on the upper part and forklift holes (11) on the bottom side.

3. The nitrogen generator for grain storage according to claim 2, characterized in that, The forklift hole (11) is a square hole, and there are four in total, with two on each side in a symmetrical distribution.

4. The nitrogen generator for grain storage according to claim 1, characterized in that, The air buffer tank (3) is equipped with a first drain ball valve (12) at the bottom.

5. The nitrogen generator for grain storage according to claim 1, characterized in that, The pressure swing adsorption nitrogen generator (4) includes a pressure swing adsorption separation tower and a PLC control cabinet (17).

6. The nitrogen generator for grain storage according to claim 5, characterized in that, The pressure swing adsorption separation tower has two side by side and is filled with adsorption molecular sieves.

7. The nitrogen generator for grain storage according to claim 5, characterized in that, The PLC control cabinet (17) is located between the two pressure swing adsorption separation towers and is equipped with a PLC control system. The surface of the control cabinet is also equipped with a touch screen (13).

8. The nitrogen generator for grain storage according to claim 1, characterized in that, The nitrogen buffer tank (5) is equipped with a second drain ball valve (14) at the bottom.

9. The nitrogen generator for grain storage according to claim 1, characterized in that, The qualified nitrogen emission port (9) is equipped with a nitrogen emission control valve (15) at the front end, and the vent port (10) is equipped with a nitrogen vent control valve (16) at the front end.

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