Pressure withstand test pipeline

Abstract

The utility model belongs to the technical field of pressure pipelines, and relates to a pressure withstand test pipeline which comprises a nitrogen spherical tank, a nitrogen outlet pipe arranged at the bottom of the nitrogen spherical tank is connected to a nitrogen pressure regulating pipeline, the nitrogen pressure regulating pipeline is connected to a nitrogen compressor, the nitrogen compressor is connected to an air separation unit, and the air separation unit is connected with an oxygen compressor. An oxygen adjusting pipeline is led out of the oxygen compressor, the air separation unit is connected to a liquid argon storage tank, the liquid argon storage tank is connected to an air bath vaporizer through a liquid argon plunger pump, the air bath vaporizer is connected with an argon pressure adjusting pipeline, and the argon adjusting pipeline is connected to an argon balloon tank through an argon outlet pipe. According to the utility model, the buffer memory of the argon and nitrogen spherical tanks in the air partition is used as a gas source for the pressure-resistant test, and the stepped pressurizing technology is utilized, so that the economic organization of the pressure-resistant test is realized, the production organization and the pressure-resistant test can be simultaneously carried out, and the economical efficiency of engineering construction is more obvious.

Description

Technical Field

[0001] The utility model belongs to the technical field of pressure pipelines, and in particular relates to a pressure and withstand voltage test pipeline. Background Art

[0002] Pressure test of pressure pipelines for industrial gas media such as oxygen and nitrogen in steel plants. The air separation unit is a supporting equipment for the public auxiliary system of the steel plant, providing the steel plant with continuous industrial gas media such as oxygen and nitrogen, which is indispensable in the metal smelting process. Between the air separation unit and the steel plant users, the pressure pipeline plays the function of product transportation. With the large-scale development of steel plants, pressure pipelines are often designed for long distances and large diameters. The management of pressure pipelines is in accordance with the management regulations of pressure vessels, and pressure tests are required before production.

[0003] From a safety perspective, the gas pressure test of the pressure pipeline needs to meet the requirements of cleanliness and inertness. Compressed air and nitrogen are the best choices. To conduct a pressure test on a pressure pipeline, the pressure of the pipeline needs to be increased to 1.15 times the design pressure. Taking the medium-pressure oxygen pipeline as an example, the pressure of the pressure test needs to reach 2.8MPa(G). The common practice in the industry is to start the compressor to increase the pipeline pressure to the maximum working pressure, and then continue to inflate and pressurize the pipeline by temporarily configuring a small piston compressor on site.

[0004] The starting gas compressor in the existing pressure pipeline consumes a lot of electricity and the pressure test takes a long time. Therefore, a pressure and pressure test pipeline is proposed. Utility Model Content

[0005] The utility model aims to provide a pressure resistance test pipeline, which can realize the pressure resistance test function safely and economically, and solves the problems of large power consumption and long time consumption of pressure charging test in the starting gas compressor of the prior art.

[0006] In order to achieve the above-mentioned purpose, the technical solution adopted by the utility model is as follows: the utility model provides a pressure resistance test pipeline, including a nitrogen balloon, a nitrogen outlet pipe is arranged at the bottom of the nitrogen balloon and connected to the nitrogen pressure regulating pipeline, the nitrogen regulating pipeline is connected to the nitrogen compressor, the nitrogen compressor is connected to the air separation unit, the air separation unit is connected to the oxygen compressor, the oxygen compressor leads to an oxygen regulating pipeline, the air separation unit is connected to a liquid argon storage tank, the liquid argon storage tank is connected to an air bath vaporizer through a liquid argon plunger pump, the air bath vaporizer is connected to the argon pressure regulating pipeline, the argon regulating pipeline is connected to the argon balloon through an argon outlet pipe, the nitrogen balloon and the argon balloon are respectively led to a nitrogen discharge pipe and an argon discharge pipe connected to the inflation pipeline, and the inflation pipeline is respectively connected to the nitrogen regulating pipeline and the oxygen regulating pipeline.

[0007] Preferably, the nitrogen outlet pipe is provided with a nitrogen outlet valve, and the argon outlet pipe is provided with an argon outlet valve.

[0008] Preferably, the nitrogen regulating pipeline is provided with a nitrogen pressure regulating valve, the oxygen regulating pipeline is provided with an oxygen regulating valve, and the argon regulating pipeline is provided with an argon pressure regulating valve.

[0009] Preferably, a nitrogen compressor outlet valve is provided on the nitrogen regulating pipeline at the front side of the nitrogen compressor, and an oxygen compressor outlet valve is provided on the oxygen regulating pipeline at the front side of the oxygen compressor.

[0010] Preferably, the inflation pipe is connected to the nitrogen regulating pipe and the argon regulating pipe, and the ends thereof are provided with a nitrogen inflation valve and an argon inflation valve respectively.

[0011] Preferably, the nitrogen discharge pipe is provided with a nitrogen discharge valve and a nitrogen check valve, a nitrogen vent pipe is led out between the nitrogen discharge valve and the nitrogen check valve, and the nitrogen vent pipe is provided with a nitrogen vent valve.

[0012] Preferably, the argon discharge pipe is provided with an argon discharge valve and an argon check valve, an argon vent pipe is led out between the argon discharge valve and the argon check valve, and the argon vent pipe is provided with an argon vent valve.

[0013] Compared with the prior art, the advantages and positive effects of the utility model are:

[0014] 1. The utility model utilizes the cache of argon and nitrogen gas cylinders in the air partition as the gas source for the pressure test, and utilizes the step-by-step pressure charging technology to realize the economic organization of the pressure test. It can realize the simultaneous implementation of production organization and pressure test, and the economy of engineering construction is more obvious;

[0015] 2. The utility model has the function of realizing the pressure resistance test safely and economically, and solves the problems of the prior art that the starting gas compressor consumes a lot of electricity and the pressure charging test takes a long time. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the following is a brief introduction to the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative labor.

[0017] Figure 1 It is a structural schematic diagram of a pressure and pressure resistance test pipeline;

[0018] In the above figure, 1. nitrogen ball tank, 2. nitrogen outlet valve, 3. argon ball tank, 4. argon outlet valve, 5. air separation unit, 6. nitrogen compressor, 7. oxygen compressor, 8. oxygen compressor outlet valve, 9. nitrogen compressor outlet valve, 10. liquid argon storage tank, 11. liquid argon plunger pump, 12. air bath vaporizer, 13. argon discharge valve, 14. argon vent valve, 15. argon check valve, 16. nitrogen discharge valve, 17. nitrogen vent valve, 18. nitrogen check valve, 19. argon pressure regulating valve, 20. nitrogen pressure regulating valve, 21. oxygen pressure regulating valve, 22. nitrogen charging valve, 23. argon charging valve. DETAILED DESCRIPTION

[0019] In order to more clearly understand the above-mentioned purpose, features and advantages of the utility model, the utility model is further described below in conjunction with the accompanying drawings and embodiments. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0020] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways than those described herein. Therefore, the present invention is not limited to the specific embodiments of the following disclosure.

[0021] Embodiment 1, as Figure 1 As shown, a pressure resistance test pipeline includes a nitrogen ball tank 1, which can store nitrogen and provide a nitrogen source required for the pressure resistance test, and serves as a buffer device to ensure a stable nitrogen supply. A nitrogen outlet pipe is provided at the bottom of the nitrogen ball tank 1 and is connected to a nitrogen pressure regulating pipeline. The nitrogen outlet pipe transports and controls the outflow of nitrogen, connects the nitrogen ball tank 1 with the nitrogen pressure regulating pipeline, and regulates the output of nitrogen. The nitrogen pressure regulating pipeline regulates the nitrogen pressure to ensure that the nitrogen pressure meets the requirements of the pressure resistance test.

[0022] The nitrogen regulating pipeline is connected to the nitrogen compressor 6, which can compress nitrogen, increase the nitrogen pressure, and control the output of nitrogen. The nitrogen compressor 6 is connected to the air separation unit 5, which is a supporting equipment for the public auxiliary system of the steel plant and can provide continuous industrial gas media such as oxygen and nitrogen. The air separation unit 5 is connected to the oxygen compressor 7, which can compress nitrogen, increase the oxygen pressure, and control the output of oxygen. The oxygen compressor 7 is led out with an oxygen regulating pipeline, and the oxygen pressure regulating pipeline regulates the oxygen pressure to ensure that the oxygen pressure meets the requirements of the pressure resistance test.

[0023] The air separation unit 5 is connected to a liquid argon storage tank 10, which can store liquid argon. The liquid argon storage tank 10 is connected to an air bath vaporizer 12 through a liquid argon plunger pump 11. The liquid argon plunger pump 11 pressurizes and transports liquid argon from the liquid argon storage tank 10 to the air bath vaporizer 12. The air bath vaporizer 12 vaporizes the liquid argon to provide gaseous argon required for the pressure test. The utilization efficiency of argon is improved through gasification, and the waste of gas source is reduced. The air bath vaporizer 12 is connected to an argon pressure regulating pipeline, which regulates the nitrogen pressure to ensure that the argon pressure meets the requirements of the pressure test.

[0024] The argon regulating pipeline is connected to the argon ball tank 3 through the argon outlet pipe. The nitrogen outlet pipe transports and controls the outflow of argon. The argon ball tank 3 is connected to the argon pressure regulating pipeline to adjust the output of argon. The argon ball tank 3 can store argon and provide the argon source required for the pressure test. As a buffer device, it ensures a stable supply of argon.

[0025] The nitrogen ball tank 1 and the argon ball tank 3 are respectively provided with a nitrogen exhaust pipe and an argon exhaust pipe connected to the inflation pipe, and the inflation pipe is respectively connected to the nitrogen regulating pipe and the oxygen regulating pipe. The nitrogen ball tank 1 and the argon ball tank 3 are connected through the nitrogen exhaust pipe and the argon exhaust pipe, and the inflation pipe is respectively connected to the nitrogen regulating pipe and the oxygen regulating pipe to realize pressure regulation.

[0026] The following is a detailed description of the design of the above key components:

[0027] The nitrogen outlet pipe is provided with a nitrogen outlet valve 2, and the argon outlet pipe is provided with an argon outlet valve 4. The nitrogen outlet pipe is installed on the nitrogen outlet pipe and is mainly used to control the output of nitrogen, and the argon outlet valve 4 is installed on the argon outlet pipe and is mainly used to control the output of argon. The design of the nitrogen outlet valve 2 and the argon outlet valve 4 needs to take into account the convenience of operation and air tightness to avoid leakage. Common valve types include ball valves, butterfly valves, etc., and the material is generally stainless steel or alloy steel.

[0028] The nitrogen regulating pipeline is provided with a nitrogen pressure regulating valve 20, the oxygen regulating pipeline is provided with an oxygen regulating valve, and the argon regulating pipeline is provided with an argon pressure regulating valve 19. The nitrogen pressure regulating valve 20, the oxygen pressure regulating valve 21, and the argon pressure regulating valve 19 are used to control the pressures of nitrogen, oxygen, and argon, respectively, to ensure that the test requirements are met. The nitrogen pressure regulating valve 20, the oxygen pressure regulating valve 21, and the argon pressure regulating valve 19 need to have a high-precision regulating function, and needle valves or diaphragm valves are often used.

[0029] A nitrogen compressor outlet valve 9 is provided on the nitrogen regulating pipeline in front of the nitrogen compressor 6, and an oxygen compressor outlet valve 8 is provided on the oxygen regulating pipeline in front of the oxygen compressor 7. The nitrogen compressor 6 is used to increase the pressure of the nitrogen, and the oxygen compressor 7 is used to increase the pressure of the oxygen to meet the requirements of the pressure test. The nitrogen compressor 6 and the oxygen compressor 7 need to have efficient and stable compression capabilities, and usually use screw or piston compressors. The nitrogen compressor outlet valve 9 is installed on the nitrogen regulating pipeline to control the nitrogen flow output by the nitrogen compressor 6, and the oxygen compressor outlet valve 8 is installed on the oxygen regulating pipeline to control the oxygen flow output by the oxygen compressor 7.

[0030] The inflation pipe is connected to the nitrogen regulating pipe and the argon regulating pipe at the end thereof, and is provided with a nitrogen inflation valve 22 and an argon inflation valve 23, respectively. The inflation pipe is connected to the nitrogen regulating pipe and the argon regulating pipe, and is used to transport nitrogen and argon to the nitrogen regulating pipe and the argon regulating pipe. The nitrogen inflation valve 22 and the argon inflation valve 23 are used to control the inflation process of nitrogen and argon, respectively, and need to have high-precision flow control capability, and the valve material is selected from stainless steel or high-performance alloy.

[0031] The nitrogen discharge pipe is provided with a nitrogen discharge valve 16 and a nitrogen check valve 18, a nitrogen vent pipe is led out between the nitrogen discharge valve 16 and the nitrogen check valve 18, and the nitrogen vent pipe is provided with a nitrogen vent valve 17. The nitrogen discharge pipe is used to discharge nitrogen, and the nitrogen discharge valve 16 is used to control the discharge of nitrogen, and a ball valve or a gate valve is commonly used. The nitrogen check valve 18 prevents gas backflow to ensure safety. The nitrogen vent pipe is used to safely discharge excess nitrogen into the atmosphere after the test is completed, and the nitrogen vent valve 17 controls the opening and closing of the nitrogen vent pipe.

[0032] The argon discharge pipe is provided with an argon discharge valve 13 and an argon check valve 15, an argon vent pipe is led out between the argon discharge valve 13 and the argon check valve 15, and the argon vent pipe is provided with an argon vent valve 14. The argon discharge pipe is used to discharge argon, and the argon discharge valve 13 is used to control the discharge of argon, and a ball valve or a gate valve is commonly used. The argon check valve 15 prevents gas backflow to ensure safety. The argon vent pipe is used to safely discharge excess argon into the atmosphere after the test is completed, and the argon vent valve 14 controls the opening and closing of the argon vent pipe.

[0033] Embodiment 2, a pressure and pressure resistance test pipeline as shown in embodiment 1, comprising:

[0034] (1) Inflating pipeline. Lead the argon ball tank 3 and the nitrogen ball tank 1 to the inflation pipeline. The inflation pipeline is inflated by the nitrogen discharge valve 16 and the argon discharge valve 13. The designed and installed nitrogen check valve 18 and argon check valve 15 have the function of preventing the "backflow" of different media. The designed nitrogen vent valve 17 and argon vent valve 14 can realize the safe discharge of leaked gas.

[0035] (2) Liquid argon plunger pump 11. The maximum working pressure of the liquid argon plunger pump 11 is 3.4 MPa, and the daily working range is 2.0-2.5 MPa. The liquid argon stored in the liquid argon storage tank 10 is pressurized, converted into argon gas through heat exchange in the air bath vaporizer, and stored in the argon ball tank 3, and the pressure is gradually increased to 2.8 MPa. The argon pressure regulating valve 19 automatically reduces the pressure to the target pressure for the user to use according to the user's use requirements.

[0036] (3) Nitrogen balloon 1. For the pressure test of the nitrogen pressure-resistant pipeline, start the nitrogen compressor 6 and increase the pressure of the nitrogen balloon 1 and the nitrogen pressure-regulating pipeline to the maximum exhaust pressure of 2.0 MPa. Close the nitrogen outlet valve 2 of the nitrogen balloon 1 and store the nitrogen as buffer gas. Introduce the argon gas source and continue to increase the pressure to the pressure test pressure of 2.84 MPa. First, open the nitrogen charging valve 22. Secondly, close the nitrogen vent valve 17, and slowly open the argon discharge valve 13 of the argon balloon 3 to increase the pressure of the nitrogen pressure-regulating pipeline. During this period, adjust the operating frequency of the liquid argon plunger pump 11 according to the pressure-raising speed of the nitrogen pressure-regulating pipeline. After the test, close the nitrogen charging valve 22 and the nitrogen discharge valve 16, and open the argon vent valve 14;

[0037] For the pressure test of the oxygen pipeline, the buffer of the nitrogen balloon 1 is utilized. First, open the argon filling valve 23, close the nitrogen vent valve 17, gradually open the nitrogen discharge valve 16, and introduce nitrogen into the oxygen pressure regulating pipeline. If the nitrogen pressure regulating pipeline is already in a normal external supply working state, then adjust the operating load of the nitrogen compressor 6 according to the nitrogen filling speed to keep the pressure of the nitrogen balloon 1 at 2.0MPa. When the nitrogen filling of the oxygen pressure regulating pipeline reaches 2.0MPa, stop filling nitrogen. Close the nitrogen discharge valve 16 of the nitrogen balloon 1, and open the nitrogen vent valve 17. Then introduce high-pressure argon into the argon balloon 3 to increase the pressure again. Close the argon vent valve 14, gradually open the argon discharge valve 13, and gradually increase the pressure of the oxygen pressure regulating pipeline to the target value of the pressure test.

[0038] The standard parts used in the utility model can all be purchased from the market, special-shaped parts can be customized according to the description in the specification and the drawings, the specific connection methods of each part adopt the conventional means such as mature bolts, rivets, welding, etc. in the prior art, the machinery, parts and equipment all adopt the conventional models in the prior art, and the circuit connection adopts the conventional connection method in the prior art, which will not be described in detail here. The content not described in detail in this specification belongs to the prior art known to professional and technical personnel in this field.

[0039] The above description is only a preferred embodiment of the present invention and does not limit the present invention in other forms. Any technician familiar with the profession may use the technical content disclosed above to change or modify it into an equivalent embodiment with equivalent changes and apply it to other fields. However, any simple modification, equivalent change and modification made to the above embodiment based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still falls within the protection scope of the technical solution of the present invention.

Claims

1. A pressure and pressure resistance test pipeline, characterized in that: It comprises a nitrogen balloon tank, a nitrogen outlet pipe is arranged at the bottom of the nitrogen balloon tank and connected to a nitrogen pressure regulating pipeline, the nitrogen regulating pipeline is connected to a nitrogen compressor, the nitrogen compressor is connected to an air separation unit, the air separation unit is connected to an oxygen compressor, an oxygen regulating pipeline is led out of the oxygen compressor, the air separation unit is connected to a liquid argon storage tank, the liquid argon storage tank is connected to an air bath vaporizer through a liquid argon plunger pump, the air bath vaporizer is connected to an argon pressure regulating pipeline, the argon regulating pipeline is connected to the argon balloon tank through an argon outlet pipe, a nitrogen discharge pipe and an argon discharge pipe are led out of the nitrogen balloon tank and the argon balloon tank respectively and connected to a gas charging pipe, and the gas charging pipe is respectively connected to a nitrogen regulating pipe and an oxygen regulating pipe.

2. A pressure and pressure resistance test pipeline according to claim 1, characterized in that: The nitrogen outlet pipe is provided with a nitrogen outlet valve, and the argon outlet pipe is provided with an argon outlet valve.

3. A pressure and pressure resistance test pipeline according to claim 1, characterized in that: The nitrogen regulating pipeline is provided with a nitrogen pressure regulating valve, the oxygen regulating pipeline is provided with an oxygen regulating valve, and the argon regulating pipeline is provided with an argon pressure regulating valve.

4. A pressure and pressure resistance test pipeline according to claim 1, characterized in that: A nitrogen compressor outlet valve is arranged on the nitrogen regulating pipeline at the front side of the nitrogen compressor, and an oxygen compressor outlet valve is arranged on the oxygen regulating pipeline at the front side of the oxygen compressor.

5. A pressure and pressure resistance test pipeline according to claim 1, characterized in that: The inflation pipeline is connected to the nitrogen regulating pipeline and the argon regulating pipeline, and the ends thereof are respectively provided with a nitrogen inflation valve and an argon inflation valve.

6. A pressure and pressure resistance test pipeline according to claim 1, characterized in that: The nitrogen discharge pipe is provided with a nitrogen discharge valve and a nitrogen check valve, a nitrogen vent pipe is led out between the nitrogen discharge valve and the nitrogen check valve, and the nitrogen vent pipe is provided with a nitrogen vent valve.

7. A pressure and pressure resistance test pipeline according to claim 1, characterized in that: The argon discharge pipe is provided with an argon discharge valve and an argon check valve, an argon vent pipe is led out between the argon discharge valve and the argon check valve, and the argon vent pipe is provided with an argon vent valve.

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