Nitrogen-oxygen mixing system

Abstract

The utility model relates to the technical field of gas mixing, in particular to a nitrogen-oxygen mixing system which comprises an air branch, a nitrogen branch and a mixing pipeline. Wherein an adjusting valve is arranged on the nitrogen branch, one end of the mixing pipeline is communicated with the air branch and the nitrogen branch, the other end of the mixing pipeline is communicated with the storage tank, a nitrogen-oxygen mixer and a first flow meter are arranged on the mixing pipeline, an oxygen detector is arranged at the nitrogen-oxygen mixer, and the oxygen detector is used for detecting the oxygen concentration. The concentration of oxygen in the mixed gas at the nitrogen-oxygen mixer can be known through the oxygen detector, and the adjusting valve on the nitrogen branch can be adjusted according to the oxygen concentration, so that the concentration of oxygen in the mixed gas is proper. And the flow of the mixed gas injected into the storage tank can be known through the first flow meter. The nitrogen-oxygen mixing system can ensure that the ratio of nitrogen to oxygen is proper, and the nitrogen and the oxygen can be filled into the styrene storage tank so as to ensure the storage safety and the storage quality of styrene.

Description

Technical Field

[0001] The utility model relates to the technical field of gas mixing, in particular to a nitrogen and oxygen mixing system. Background Art

[0002] The styrene storage tanks in the factory need to be nitrogen-sealed with fixed tops, and because styrene is extremely easy to polymerize, a certain proportion of inhibitors needs to be added. The inhibitors need to come into contact with oxygen to remain active, but if the oxygen content in the tank is too high, it will increase the safety risk of storage.

[0003] Therefore, there is an urgent need for a nitrogen-oxygen mixing system to solve the above problems. Utility Model Content

[0004] The utility model aims to provide a nitrogen-oxygen mixing system, which can ensure that the ratio of nitrogen and oxygen is appropriate and can be poured into a styrene storage tank to ensure the storage safety and storage quality of styrene.

[0005] To achieve this purpose, the utility model adopts the following technical solutions:

[0006] A nitrogen and oxygen mixing system is provided, comprising:

[0007] Air branch;

[0008] A nitrogen branch, wherein a regulating valve is provided on the nitrogen branch;

[0009] A mixing pipeline, one end of which is connected to the air branch and the nitrogen branch, and the other end of which is connected to the storage tank. A nitrogen-oxygen mixer and a first flow meter are provided on the mixing pipeline. An oxygen detector is provided at the nitrogen-oxygen mixer, and the oxygen detector is used to detect oxygen concentration.

[0010] Optionally, a first pressure reducing valve is provided on the air branch.

[0011] Optionally, a first manual control valve, a first one-way valve and a first stop valve are provided on the air branch, the first manual control valve is provided upstream of the first pressure reducing valve, and the first one-way valve and the first stop valve are provided downstream of the first pressure reducing valve in sequence.

[0012] Optionally, pressure detectors are provided upstream and downstream of the first pressure reducing valve.

[0013] Optionally, it further comprises a drain branch, one end of which is connected to the air branch, and a drain branch is provided with a drain trap.

[0014] Optionally, pressure detectors are provided both upstream and downstream of the regulating valve.

[0015] Optionally, the nitrogen branch is further provided with a second manual control valve, a second one-way valve and a second stop valve, the second manual control valve is arranged upstream of the regulating valve, and the second one-way valve and the second stop valve are arranged downstream of the regulating valve in sequence.

[0016] Optionally, the mixing pipeline also includes an upstream mixing pipeline, a first branch, a second branch and a downstream mixing pipeline, the first branch and the second branch are arranged in parallel, the upstream ends of the first branch and the second branch are connected to the upstream mixing pipeline, and the downstream ends of the first branch and the second branch are connected to the downstream mixing pipeline.

[0017] Optionally, the upstream mixing pipeline is provided with the nitrogen-oxygen mixer, the third manual control valve, and the first flow meter in sequence;

[0018] And / or, a third one-way valve is provided on the downstream mixing pipeline, and the downstream end of the downstream mixing pipeline is connected to the storage tank.

[0019] Optionally, the first branch is provided with a third stop valve, a second pressure reducing valve, a second flow meter and a fourth manual control valve in sequence;

[0020] And / or, the second branch is provided with a fourth stop valve, an automatic control valve and a third flow meter in sequence.

[0021] Beneficial effects of the utility model:

[0022] The utility model provides a nitrogen-oxygen mixing system, including an air branch, a nitrogen branch and a mixing pipeline. Among them, a regulating valve is arranged on the nitrogen branch, one end of the mixing pipeline is connected to the air branch and the nitrogen branch, and the other end is connected to the storage tank. A nitrogen-oxygen mixer and a first flow meter are arranged on the mixing pipeline. An oxygen detector is arranged at the nitrogen-oxygen mixer, and the oxygen detector is used to detect the oxygen concentration. The concentration of oxygen in the mixed gas at the nitrogen-oxygen mixer can be known through the oxygen detector, and the regulating valve on the nitrogen branch can be adjusted according to the oxygen concentration to make the concentration of oxygen in the mixed gas appropriate. And the flow rate of the mixed gas poured into the storage tank can be known through the first flow meter. The nitrogen-oxygen mixing system can ensure that the ratio of nitrogen and oxygen is appropriate, and can be poured into the styrene storage tank to ensure the storage safety and storage quality of styrene. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural schematic diagram of a nitrogen-oxygen mixing system provided in an embodiment of the utility model.

[0024] In the figure:

[0025] 1. Regulating valve; 2. Storage tank; 3. Nitrogen and oxygen mixer; 4. First flow meter; 5. Oxygen detector; 6. First pressure reducing valve; 7. First manual control valve; 8. First non-return valve; 9. First stop valve; 10. Pressure detector; 11. Steam trap; 12. Second manual control valve; 13. Second non-return valve; 14. Second stop valve; 15. Third manual control valve; 16. Third non-return valve; 17. Third stop valve; 18. Second pressure reducing valve; 19. Second flow meter; 20. Fourth manual control valve; 21. Fourth stop valve; 22. Automatic control valve; 23. Third flow meter; 24. Air source; 25. Nitrogen source. DETAILED DESCRIPTION

[0026] The technical solution of the utility model is further described below in conjunction with the accompanying drawings and implementation methods. It is understood that the specific embodiments described herein are only used to explain the utility model, rather than to limit the utility model. It should also be noted that, for the convenience of description, only the parts related to the utility model are shown in the accompanying drawings, rather than all.

[0027] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0028] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0029] like Figure 1 As shown, the nitrogen-oxygen mixing system of this embodiment includes an air branch, a nitrogen branch and a mixing pipeline. Among them, a regulating valve 1 is provided on the nitrogen branch, one end of the mixing pipeline is connected to the air branch and the nitrogen branch, and the other end is connected to the storage tank 2. A nitrogen-oxygen mixer 3 and a first flowmeter 4 are provided on the mixing pipeline, and an oxygen detector 5 is provided at the nitrogen-oxygen mixer 3, and the oxygen detector 5 is used to detect the oxygen concentration. The nitrogen-oxygen mixer 3 belongs to the prior art and will not be introduced in detail here.

[0030] The oxygen concentration in the mixed gas at the nitrogen-oxygen mixer 3 can be known through the oxygen detector 5, and the regulating valve 1 on the nitrogen branch can be adjusted according to the oxygen concentration to make the oxygen concentration in the mixed gas appropriate. And the flow rate of the mixed gas poured into the storage tank 2 can be known through the first flowmeter 4. The nitrogen-oxygen mixing system can ensure that the ratio of nitrogen and oxygen is appropriate, and can be poured into the styrene storage tank to ensure that there is not too much oxygen to affect the storage safety of styrene, or too little to affect the storage quality of styrene.

[0031] Optionally, in this embodiment, the air source 24 of the air branch is the instrument air of the plant. The pressure of the instrument air of the plant is in the range of 4kg-6kg. In order to reduce the pressure of the instrument air and obtain air with a pressure of 1kg suitable for filling the storage tank 2, the air branch is optionally provided with a first pressure reducing valve 6. In order to facilitate pressure monitoring, pressure detectors 10 are optionally provided upstream and downstream of the first pressure reducing valve 6.

[0032] Optionally, the air branch is provided with a first manual control valve 7, a first one-way valve 8 and a first stop valve 9, the first manual control valve 7 is provided upstream of the first pressure reducing valve 6, and the first one-way valve 8 and the first stop valve 9 are provided downstream of the first pressure reducing valve 6 in sequence. The first manual control valve 7 is used to control the access of instrument air, the first one-way valve 8 is used to prevent gas backflow, and the first stop valve 9 is used to control whether the air branch is connected to the mixing pipeline.

[0033] Optionally, the instrument air passes through a 2-inch main pipeline and a 3 / 4-inch branch pipeline, and is then transported to the nitrogen-oxygen mixing system after being dehydrated and deoiled. After entering the air branch, the air passes through the first manual control valve 7, the first pressure reducing valve 6, the first non-return valve 8 and the first stop valve 9 in sequence, and enters the nitrogen-oxygen mixer 3.

[0034] Optionally, the nitrogen-oxygen mixing system further comprises a drain branch, one end of which is connected to the air branch, and a drain branch is provided with a drain trap 11. Optionally, the drain branch is connected to the pipeline between the air source 24 and the first manual control valve 7.

[0035] In order to facilitate monitoring of the pressure of oxygen before and after the regulating valve 1 , optionally, pressure detectors 10 are provided both upstream and downstream of the regulating valve 1 .

[0036] Optionally, a second manual control valve 12, a second one-way valve 13 and a second stop valve 14 are further provided on the nitrogen branch, the second manual control valve 12 is provided upstream of the regulating valve 1, and the second one-way valve 13 and the second stop valve 14 are provided downstream of the regulating valve 1 in sequence. The second manual control valve 12 is used to control the access of nitrogen, the second one-way valve 13 is used to prevent gas backflow, and the second stop valve 14 is used to control whether the nitrogen branch is connected to the mixing pipeline.

[0037] Optionally, in this embodiment, the nitrogen source 25 is plant nitrogen with a pressure of 4 kg. The plant nitrogen is transported to the tank area through a 2-inch main pipeline, and then the pressure is reduced to 1 kg after decompression, and then the nitrogen enters the nitrogen branch through a 1-inch branch pipeline. The nitrogen then passes through the second manual control valve 12, the regulating valve 1, the second one-way valve 13 and the second stop valve 14, and enters the nitrogen-oxygen mixer 3. Optionally, the regulating valve 1 is a pneumatic proportional control valve.

[0038] Optionally, the mixing pipeline also includes an upstream mixing pipeline, a first branch, a second branch and a downstream mixing pipeline, the first branch and the second branch are arranged in parallel, the upstream ends of the first branch and the second branch are connected to the upstream mixing pipeline, and the downstream ends of the first branch and the second branch are connected to the downstream mixing pipeline.

[0039] Optionally, the upstream mixing pipeline is provided with a nitrogen-oxygen mixer 3, a third manual control valve 15, and a first flow meter 4 in sequence. Optionally, the downstream mixing pipeline is provided with a third one-way valve 16, and the downstream end of the downstream mixing pipeline is connected to the storage tank 2, and the third one-way valve 16 can prevent gas backflow.

[0040] Optionally, the first branch is provided with a third stop valve 17, a second pressure reducing valve 18, a second flow meter 19 and a fourth manual control valve 20 in sequence. Optionally, the second branch is provided with a fourth stop valve 21, an automatic control valve 22 and a third flow meter 23 in sequence. The third stop valve 17 and the fourth stop valve 21 are used to control whether the first branch or the second branch is opened, and the second pressure reducing valve 18 can further reduce the pressure of the mixed gas to prepare for filling into the storage tank 2. The second flow meter 19 and the third flow meter 23 are used to measure the flow of the mixed gas filled into the storage tank 2, and the fourth manual control valve 20 and the automatic control valve 22 are used to further control the flow of the first branch and the second branch, and the appropriate branch can be opened according to the pressure of the mixed gas.

[0041] Optionally, instrument air and nitrogen enter the nitrogen-oxygen mixer 3 for mixing, then pass through the third manual control valve 15 and the first flowmeter 4 , and then through the first branch or the second branch to reach the third one-way valve 16 and be transported to the storage tank 2 .

[0042] Optionally, a pneumatic pump is provided at the front end of the oxygen detector 5 to introduce part of the mixed gas into the oxygen detector 5 for detection.

[0043] Optionally, the first flow meter 4, the regulating valve 1 and the oxygen detector 5 of the nitrogen and oxygen mixing system are all connected to the plant area PLC (Programmable Logic Controller) automatic control system to achieve automatic interlocking control.

[0044] When there is no flow in the first flow meter 4, the pneumatic proportional control valve of the nitrogen branch does not operate. When the detection value of the oxygen detector 5 is greater than 9%, the pneumatic proportional control valve of the nitrogen branch increases by 10% to reduce the proportion of oxygen in the mixed gas. When the detection value of the oxygen detector 5 is less than 9%, the pneumatic proportional control valve of the nitrogen branch decreases by another 10% and returns to the original opening.

[0045] The nitrogen-oxygen mixing system is used to ensure that the inhibitor in the styrene storage tank is fully in contact with oxygen to maintain its activity during the storage of styrene raw materials. Moreover, by automatically controlling the oxygen content in the storage tank 2, the risk of increasing the explosion of the styrene storage tank can be avoided. In addition, the nitrogen-oxygen mixing system also ensures that the styrene storage tank is safely stored in a nitrogen-sealed manner.

[0046] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all implementation methods here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. A nitrogen and oxygen mixing system, characterized in that: include: Air branch; A nitrogen branch line, wherein a regulating valve (1) is provided on the nitrogen branch line; A mixing pipeline, one end of which is connected to the air branch and the nitrogen branch, and the other end of which is connected to the storage tank (2), a nitrogen-oxygen mixer (3) and a first flow meter (4) are provided on the mixing pipeline, and an oxygen detector (5) is provided at the nitrogen-oxygen mixer (3), and the oxygen detector (5) is used to detect oxygen concentration.

2. The nitrogen and oxygen mixing system according to claim 1, characterized in that: The air branch is provided with a first pressure reducing valve (6).

3. The nitrogen and oxygen mixing system according to claim 2, characterized in that: The air branch is provided with a first manual control valve (7), a first non-return valve (8) and a first stop valve (9); the first manual control valve (7) is arranged upstream of the first pressure reducing valve (6); the first non-return valve (8) and the first stop valve (9) are arranged downstream of the first pressure reducing valve (6) in sequence.

4. The nitrogen and oxygen mixing system according to claim 2, characterized in that: Pressure detectors (10) are provided upstream and downstream of the first pressure reducing valve (6).

5. The nitrogen and oxygen mixing system according to claim 1, characterized in that: It also includes a drain branch, one end of which is connected to the air branch, and a drain branch is provided with a drain trap (11).

6. The nitrogen and oxygen mixing system according to claim 1, characterized in that: Pressure detectors (10) are provided upstream and downstream of the regulating valve (1).

7. The nitrogen and oxygen mixing system according to claim 1, characterized in that: The nitrogen branch line is also provided with a second manual control valve (12), a second one-way valve (13) and a second stop valve (14); the second manual control valve (12) is arranged upstream of the regulating valve (1), and the second one-way valve (13) and the second stop valve (14) are arranged downstream of the regulating valve (1) in sequence.

8. The nitrogen and oxygen mixing system according to claim 1, characterized in that: The mixing pipeline also includes an upstream mixing pipeline, a first branch, a second branch and a downstream mixing pipeline. The first branch and the second branch are arranged in parallel, the upstream ends of the first branch and the second branch are connected to the upstream mixing pipeline, and the downstream ends of the first branch and the second branch are connected to the downstream mixing pipeline.

9. The nitrogen and oxygen mixing system according to claim 8, characterized in that: The upstream mixing pipeline is provided with the nitrogen-oxygen mixer (3), the third manual control valve (15), and the first flow meter (4) in sequence; And / or, a third one-way valve (16) is provided on the downstream mixing pipeline, and the downstream end of the downstream mixing pipeline is connected to the storage tank (2).

10. The nitrogen and oxygen mixing system according to claim 8, characterized in that: The first branch is provided with a third stop valve (17), a second pressure reducing valve (18), a second flow meter (19) and a fourth manual control valve (20) in sequence; And / or, the second branch line is provided with a fourth stop valve (21), an automatic control valve (22) and a third flow meter (23) in sequence.

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