Pressure maintaining and leakage testing method of purification changeover valves for oxygen generation

A switching valve and leak testing technology, applied in the testing of mechanical parts, the testing of machine/structural parts, and the measurement of the acceleration and deceleration rate of fluids, etc., can solve the problem of reducing the lifting work of disassembling the valve, the time-consuming and laborious disassembling of the valve, and the increase of equipment costs. Costs and other issues to achieve the effect of saving labor costs, speeding up work, and reducing system downtime

Active Publication Date: 2015-04-08
NANYANG HANYE SPECIAL STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The valves of the purification system run to a certain period, and need to maintain pressure and leak test. In the past, the 14 valves were removed, and the equipment was used to check and repair each valve one by one. The factory stops production, and the loss is immeasurable; at the same time, it is time-consuming and laborious to disassemble the valve, which increases the workload of the workers. Other equipment is needed for testing, which increases the cost of the equipment. Through online pressure maintenance and leak testing, the oxygen generator can be effectively guaranteed. Normal operation, not only reduces downtime, does not delay the production of steel mills, but also reduces the lifting work of dismantling the valve

Method used

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  • Pressure maintaining and leakage testing method of purification changeover valves for oxygen generation

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Embodiment 1

[0029] The invention provides a method for pressure maintaining and leak testing of an oxygen purification switching valve, comprising the following steps:

[0030] 1) After the air separation plant is shut down, the air compressor does not stop, all valves are fully closed, and the pressure of the air compressor is kept at 0.45mpa. Observe the PI-1201 and PI-1202 pressure measuring instruments to judge whether the valve is leaking, and check the next valve Switch adjustment and change of pressure measuring instrument to detect whether the valve is leaking;

[0031] 2) Keep the pressure of the fractionation tower at 0.1-0.2mpa, prevent the normal temperature valve from being closed tightly, and the low-temperature gas backflow, causing damage to the fractionation tower or causing shutdown accidents, and observe whether the pressure of No. 1 and No. 2 molecular sieves rises for 20 minutes. If 1, If the pressure of the No. 2 molecular sieve does not rise, it means that there is ...

Embodiment 2

[0041] The present invention also provides a pressure-holding and leak-testing method for an oxygen purification switching valve, comprising the following steps:

[0042] 1) After the air separation unit is shut down, the air compressor does not stop, all valves are fully closed, and the pressure of the air compressor is kept at 0.45mpa, and the PI-1201 and PI-1202 pressure measuring instruments are observed to determine whether the valve is leaking;

[0043] 2) Keep the pressure of the fractionation tower at 0.1-0.2mpa, and observe whether the pressure of No. 1 and No. 2 molecular sieves rises for 20 minutes. If the pressure of No. 1 and No. 2 molecular sieves does not rise, then the v1201 valve and v1202 valve will not leak. If the pressure rises, the v1201 valve leaks, and if the pressure of No. 2 molecular sieve rises, the v1202 valve leaks;

[0044] 3) Open the v1201 valve of No. 1 molecular sieve, and observe whether the pressure of No. 2 molecular sieve rises. If it ris...

Embodiment 3

[0053] The present invention also provides a pressure-holding and leak-testing method for an oxygen purification switching valve, comprising the following steps:

[0054] 1) After the air separation unit is shut down, the air compressor does not stop, all valves are fully closed, and the pressure of the air compressor is kept at 0.45mpa, and the PI-1201 and PI-1202 pressure measuring instruments are observed to determine whether the valve is leaking;

[0055] 2) Keep the pressure of the fractionation tower at 0.1-0.2mpa, and observe whether the pressure of No. 1 and No. 2 molecular sieves rises for 20 minutes. If the pressure of No. 1 and No. 2 molecular sieves does not rise, then the v1201 valve and v1202 valve will not leak. If the pressure rises, the v1201 valve leaks, and if the pressure of No. 2 molecular sieve rises, the v1202 valve leaks;

[0056] 3) Open the v1201 valve of No. 1 molecular sieve, and observe whether the pressure of No. 2 molecular sieve rises. If it ris...

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Abstract

The invention discloses a pressure maintaining and leakage testing method of purification changeover valves for oxygen generation. After an air separation unit is stopped, a whole system stops working; follow-up pressure maintaining and leakage testing are performed under the condition that valve switches are controlled manually; the pressure of an air compressor is 0.45mpa; pressure measuring instruments PI-1201 and PI-1202 are observed to judge whether the valves leak or not ; the pressure of the air compressor still exists; according to opening and closing conditions of the valves, whether the valves leak or not is detected through pressure changes caused by flowing of air in pipelines. The pressure maintaining and leakage testing method has the advantages that maintenance is achieved without valve demounting, the defects that shutdown is needed for demounting of the valves and equipment is needed for detection in the prior art are avoided, normal operation of an oxygenator can be guaranteed effectively, shutdown time is reduced, production of steel mills is not affected, and hoisting for valve demounting is reduced.

Description

technical field [0001] The invention relates to the technical field of maintenance of oxygen production valves, in particular to a pressure maintaining and leak testing method for an oxygen production purification switching valve. Background technique [0002] The 20,000 molecular sieve purification system in the oxygen production area of ​​the refining and rolling plant was launched in 2008 and was prepared by Henan Kaiyuan Air Separation Co., Ltd. Due to the harsh working environment of the valves of the molecular sieve purification system, the temperature of the gas passing through the valve is 8-15°C during normal production, the gas temperature is 190-200°C when the molecular sieve is regenerated, and the lowest temperature is -15°C when the molecular sieve is blown cold. More vicious. This batch of valves has been working under high and low temperature conditions for a long time, and the internal seals, packings, gaskets, etc. of the valves are prone to fatigue, resul...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01M3/28G01M13/00
Inventor 朱书成张学勇康文举李士群周里欣
Owner NANYANG HANYE SPECIAL STEEL CO LTD
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