A nitrogen replacement device for an oxygen storage tank

Abstract

This utility model relates to the field of oxygen and nitrogen production and storage technology, and discloses an oxygen storage tank nitrogen replacement device, including a spherical tank. A gas delivery pipe is fixedly installed on one side of the bottom of the spherical tank, and a first connecting pipe is fixedly sleeved on one side of the middle of the gas delivery pipe. A first oxygen inlet / outlet valve is fixedly installed at one end of the first connecting pipe, and a second oxygen inlet / outlet valve is provided at one end of the first oxygen inlet / outlet valve. An oxygen pipe is fixedly installed at one end of the second oxygen inlet / outlet valve. This utility model forms a preliminary passage cutoff by closing the first oxygen inlet / outlet valve, the second oxygen inlet / outlet valve, the first nitrogen inlet valve, and the second nitrogen inlet valve. Then, the short section is removed and a blind flange is installed, which is equivalent to setting up a physical barrier in the pipeline, forming double protection. The first sealing ring and the second sealing ring further improve the sealing effect, effectively solving the problems of valves not closing tightly, leakage and cross-contamination, and no obvious disconnection point, and effectively avoiding the safety hazards caused by oxygen and nitrogen cross-contamination.

Description

Technical Field

[0001] This utility model relates to the field of oxygen and nitrogen production and storage technology, and in particular to a nitrogen replacement device for an oxygen storage tank. Background Technology

[0002] Oxygen is an important medium and raw material in the industrial production of oxygen. Oxygen usually requires a certain pressure when used, so it is supplied to users after being compressed by a compressor. Storage tanks are containers for storing and buffering oxygen. Generally, spherical storage tanks are used. Based on the pressure of the oxygen they store, oxygen storage tanks are generally classified as pressure vessels and need to be inspected regularly. Due to the characteristics of oxygen, hot work or other work cannot be carried out directly when repairing or inspecting oxygen spherical tanks. Replacement is required to reduce the oxygen content in the storage tank to 20.9%, and then natural ventilation is carried out before work can be carried out.

[0003] Oxygen production and supply units usually supply nitrogen medium at the same time. Pipelines can be laid from the nitrogen pipeline network to the side of the oxygen storage tank. Nitrogen can be used to quickly replace the oxygen storage tank. Since nitrogen is asphyxiating, reliable devices must be installed to prevent cross-contamination.

[0004] However, in actual operation, traditional devices rely too much on closing valves to cut off the passage. Leakage and cross-contamination caused by valves not closing tightly occur frequently, and there is a lack of obvious physical disconnection points, making it difficult to form effective isolation. This makes it easy for oxygen and nitrogen to cross-contaminate, which can easily cause safety hazards. Based on this, an oxygen storage tank nitrogen replacement device is proposed for improvement. Utility Model Content

[0005] Given that the existing devices rely solely on valve closure to cut off the passage, which results in valves not closing tightly and lacks a clear physical disconnection point, making it difficult to achieve effective isolation, this utility model is proposed.

[0006] To solve the above-mentioned technical problems, this utility model provides the following technical solution: a nitrogen replacement device for an oxygen storage tank, including a spherical tank, a gas supply pipe fixedly installed on one side of the bottom of the spherical tank, a first connecting pipe fixedly sleeved on one side of the middle of the gas supply pipe, a first oxygen inlet / outlet valve fixedly installed at one end of the first connecting pipe, a second oxygen inlet / outlet valve provided at one end of the first oxygen inlet / outlet valve, an oxygen pipe fixedly installed at one end of the second oxygen inlet / outlet valve, and a first short section fixedly installed at the opposite ends of the first oxygen inlet / outlet valve and the second oxygen inlet / outlet valve by bolts;

[0007] The bottom end of the gas pipeline is fixedly sleeved with a second connecting pipe. A first nitrogen inlet valve is fixedly installed at one end of the second connecting pipe. A second nitrogen inlet valve is provided at one end of the first nitrogen inlet valve. A nitrogen pipe is fixedly installed at one end of the second nitrogen inlet valve. A second short section is fixedly installed at the opposite end of the first nitrogen inlet valve and the second nitrogen inlet valve by bolts.

[0008] As a preferred embodiment, the spherical tank includes two first blind plates and two second blind plates.

[0009] As a preferred embodiment, the first blind plate is fixedly installed on the opposite end of the first oxygen inlet / outlet valve and the second oxygen inlet / outlet valve by bolts, and a first sealing ring is fixedly connected to the inner side of the first blind plate.

[0010] As a preferred embodiment, the second blind flange is fixedly installed on the opposite end of the first nitrogen inlet valve and the second nitrogen inlet valve by bolts, and a second sealing ring is fixedly connected to the inner side of the second blind flange.

[0011] As a preferred embodiment, the top of the spherical tank is provided with a normally open shut-off valve, and a safety valve is provided on one side of the shut-off valve.

[0012] As a preferred embodiment, a bottom purge valve is fixedly installed at the center of the bottom of the spherical tank, and a spare oxygen inlet / outlet valve is fixedly installed on the other side of the bottom of the spherical tank.

[0013] Compared with the prior art, the present invention has at least the following beneficial effects:

[0014] 1. This utility model forms an initial passage cutoff by closing the first oxygen inlet / outlet valve, the second oxygen inlet / outlet valve, the first nitrogen inlet valve, and the second nitrogen inlet valve. Then, the short section is removed and a blind flange is installed, which is equivalent to setting up a physical barrier in the pipeline, forming double protection. The first and second sealing rings further improve the sealing effect, effectively solving the problems of valves not closing tightly, leakage and cross-venting, and no obvious disconnection point, and effectively avoiding safety hazards caused by cross-venting of oxygen and nitrogen.

[0015] 2. This utility model can provide a reliable purging and replacement gas source for oxygen storage tanks through a nitrogen pipeline, eliminating the need for tedious cleaning and testing of temporary gas sources and pipelines before each replacement. This reduces preparation time and costs, ensures the safety and stability of the purging and replacement process, and prevents temporary gas source grease contamination problems. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0017] Figure 2 This is a schematic diagram of the purging and replacement state structure of the spherical tank in this utility model;

[0018] Figure 3 This is a schematic diagram of the outer structure of the first blind plate and the second blind plate in this utility model;

[0019] Figure 4This is a schematic diagram of the inner structure of the first and second blind plates in this utility model.

[0020] Explanation of reference numerals in the attached figures:

[0021] 1. Spherical tank; 2. Gas pipeline; 3. First connecting pipe; 4. First oxygen inlet / outlet valve; 5. First short section; 6. Second oxygen inlet / outlet valve; 7. Oxygen pipe; 8. Second connecting pipe; 9. First nitrogen inlet valve; 10. Second short section; 11. Second nitrogen inlet valve; 12. Nitrogen pipe; 13. Shut-off valve; 14. Safety valve; 15. Bottom purging valve; 16. Backup oxygen inlet / outlet valve; 17. First blind flange; 171. First sealing ring; 18. Second blind flange; 181. Second sealing ring. Detailed Implementation

[0022] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0023] Reference Figures 1-4 This is the first embodiment of the present invention, which provides a nitrogen replacement device for an oxygen storage tank, including a spherical tank 1. A gas supply pipe 2 is fixedly installed on one side of the bottom of the spherical tank 1. A first connecting pipe 3 is fixedly sleeved on one side of the middle of the gas supply pipe 2. A first oxygen inlet / outlet valve 4 is fixedly installed at one end of the first oxygen inlet / outlet valve 4. A second oxygen inlet / outlet valve 6 is provided at one end of the first oxygen inlet / outlet valve 4. An oxygen pipe 7 is fixedly installed at one end of the second oxygen inlet / outlet valve 6. A first short section 5 is fixedly installed at the opposite end of the first oxygen inlet / outlet valve 4 and the second oxygen inlet / outlet valve 6 by bolts.

[0024] The bottom end of the gas pipeline 2 is fixedly connected to a second connecting pipe 8. A first nitrogen inlet valve 9 is fixedly installed at one end of the second connecting pipe 8. A second nitrogen inlet valve 11 is provided at one end of the first nitrogen inlet valve 9. A nitrogen pipe 12 is fixedly installed at one end of the second nitrogen inlet valve 11. A second short section 10 is fixedly installed at the opposite end of the first nitrogen inlet valve 9 and the second nitrogen inlet valve 11 by bolts.

[0025] Spherical tank 1 includes two first blind plates 17, and spherical tank 1 also includes two second blind plates 18;

[0026] The first blind plate 17 is fixedly installed on the opposite end of the first oxygen inlet / outlet valve 4 and the second oxygen inlet / outlet valve 6 by bolts. The first sealing ring 171 is fixedly connected to the inner side of the first blind plate 17.

[0027] The second blind flange 18 is fixedly installed on the opposite end of the first nitrogen inlet valve 9 and the second nitrogen inlet valve 11 by bolts, and a second sealing ring 181 is fixedly connected to the inner side of the second blind flange 18.

[0028] Specifically, by opening and closing the first oxygen inlet / outlet valve 4, the second oxygen inlet / outlet valve 6, the first nitrogen inlet valve 9, and the second nitrogen inlet valve 11, the entry and exit of oxygen and nitrogen can be precisely controlled, facilitating replacement operations. It also facilitates pressure regulation and process control during replacement, as well as cutting off the gas passage during equipment maintenance.

[0029] The first blind flange 17 and the second blind flange 18 can isolate the oxygen and nitrogen pipelines from the spherical tank 1 when gas replacement or equipment maintenance is not required, thereby enhancing the system's sealing and safety and preventing gas leakage. The first sealing ring 171 and the second sealing ring 181 further improve the sealing effect.

[0030] Reference Figures 1-4 This is the second embodiment of the present utility model. The difference between this embodiment and the first embodiment is that the top of the spherical tank 1 is provided with a normally open shut-off valve 13, and a safety valve 14 is provided on one side of the shut-off valve 13.

[0031] A bottom purge valve 15 is fixedly installed at the center of the bottom of the spherical tank 1, and a spare oxygen inlet / outlet valve 16 is fixedly installed on the other side of the bottom of the spherical tank 1.

[0032] Specifically, the oxygen in the spherical tank 1 is released through the shut-off valve 13, and the nitrogen purged and replaced is also discharged through the shut-off valve 13. The oxygen content after replacement is detected here to ensure equipment safety. The backup oxygen inlet and outlet valve 16 provides an additional gas passage for possible subsequent operations or emergency situations.

[0033] The working principle of this utility model is as follows: First, close the first oxygen inlet / outlet valve 4 and the second oxygen inlet / outlet valve 6. Then, remove the first short section 5 and install the first blind plate 17 at the opening end of the first oxygen inlet / outlet valve 4 and the second oxygen inlet / outlet valve 6. Next, close the shut-off valve 13 at the top of the spherical tank 1. Then, remove the safety valve 14 and open the shut-off valve 13 to release the pressure inside the spherical tank 1.

[0034] After the pressure in the spherical tank 1 is released, remove the second blind flange 18 between the first nitrogen inlet valve 9 and the second nitrogen inlet valve 11, install the second short section 10, open the switches of the first nitrogen inlet valve 9 and the second nitrogen inlet valve 11, and purge and replace the spherical tank 1 with nitrogen. When the oxygen content detected at the shut-off valve 13 is between 19.5% and 21%, the purging and replacement is complete. Then, close the first nitrogen inlet valve 9 and the second nitrogen inlet valve 11, remove the second short section 10, install the second blind flange 18, and carry out the corresponding maintenance work.

[0035] After the work is completed, open the top shut-off valve 13 of the spherical tank 1, remove the first blind flange 17 installed at the opening end of the first oxygen inlet / outlet valve 4 and the second oxygen inlet / outlet valve 6, and then connect the first short section 5 to the first oxygen inlet / outlet valve 4 and the second oxygen inlet / outlet valve 6 respectively. Slightly open the first oxygen inlet / outlet valve 4 and the second oxygen inlet / outlet valve 6, and fill the spherical tank 1 with oxygen for replacement. After the replacement is qualified, close the shut-off valve 13, install the safety valve 14, and then fully open the shut-off valve 13. When the pressure in the spherical tank 1 is consistent with the pipeline network, fully open the first oxygen inlet / outlet valve 4 and the second oxygen inlet / outlet valve 6. At this time, the spherical tank 1 is put into operation.

[0036] It should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of the technical solution of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A nitrogen replacement device for an oxygen storage tank, comprising a spherical tank (1), characterized in that: A gas supply pipe (2) is fixedly installed on one side of the bottom of the spherical tank (1). A first connecting pipe (3) is fixedly sleeved on one side of the middle of the gas supply pipe (2). A first oxygen inlet / outlet valve (4) is fixedly installed at one end of the first connecting pipe (3). A second oxygen inlet / outlet valve (6) is provided at one end of the first oxygen inlet / outlet valve (4). An oxygen pipe (7) is fixedly installed at one end of the second oxygen inlet / outlet valve (6). A first short section (5) is fixedly installed at the opposite end of the first oxygen inlet / outlet valve (4) and the second oxygen inlet / outlet valve (6) by bolts. The bottom end of the gas supply pipe (2) is fixedly sleeved with a second connecting pipe (8). A first nitrogen inlet valve (9) is fixedly installed at one end of the second connecting pipe (8). A second nitrogen inlet valve (11) is provided at one end of the first nitrogen inlet valve (9). A nitrogen pipe (12) is fixedly installed at one end of the second nitrogen inlet valve (11). A second short section (10) is fixedly installed at the opposite end of the first nitrogen inlet valve (9) and the second nitrogen inlet valve (11) by bolts.

2. The nitrogen replacement device for an oxygen storage tank according to claim 1, characterized in that: The spherical tank (1) includes two first blind plates (17) and two second blind plates (18).

3. The nitrogen replacement device for an oxygen storage tank according to claim 2, characterized in that: The first blind plate (17) is fixedly installed on the opposite end of the first oxygen inlet / outlet valve (4) and the second oxygen inlet / outlet valve (6) by bolts. The first sealing ring (171) is fixedly connected to the inner side of the first blind plate (17).

4. The nitrogen replacement device for an oxygen storage tank according to claim 2, characterized in that: The second blind plate (18) is fixedly installed on the opposite end of the first nitrogen inlet valve (9) and the second nitrogen inlet valve (11) by bolts. The second sealing ring (181) is fixedly connected to the inner side of the second blind plate (18).

5. The nitrogen replacement device for an oxygen storage tank according to claim 1, characterized in that: The top of the spherical tank (1) is provided with a normally open shut-off valve (13), and a safety valve (14) is provided on one side of the shut-off valve (13).

6. The nitrogen replacement device for an oxygen storage tank according to claim 1, characterized in that: A bottom purge valve (15) is fixedly installed at the center of the bottom of the spherical tank (1), and a spare oxygen inlet / outlet valve (16) is fixedly installed on the other side of the bottom of the spherical tank (1).

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