Pressure maintaining and leak testing method for oxygen purification switching valve

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...

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

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