Oxygen generator depressurization starting method

Abstract

The invention discloses a depressurization starting method of an oxygen generator. Comprising a supercharger, an expansion machine, a molecular sieve, an air compressor, an electromagnetic valve, a tower inlet valve, an upper tower liquid air throttle valve, a waste liquid nitrogen throttle valve, a pure liquid nitrogen throttle valve, an oxygen-enriched liquid air throttle valve, a high-pressure liquid air throttle valve, a low-pressure liquid air throttle valve, a lower tower pressure regulating valve, an upper tower pressure regulating valve, a denitrification valve, a low-pressure nitrogen blow-off valve, a denitrification water tower and a high-pressure plate heat exchanger, the system comprises a low-pressure plate heat exchanger, a rectifying tower, a liquid nitrogen pump, a liquid oxygen pump, an air cooling tower, a chilled water pump, a cooling water tower, a circulating water feeding port, a circulating water outlet and a refrigerator, and has the practical effects that it is guaranteed that a large oxygen generator set is stably started in a cold state, the impact of starting of the oxygen generator set on all air separation equipment is reduced, and the service life of all the air separation equipment is prolonged; the problem that the starting time is prolonged due to overpressure of the rectifying tower is solved, reactive power consumption of high-power operation equipment such as an air compressor and a supercharger is reduced, and obvious economic benefits are achieved.

Description

technical field [0001] The present invention relates to the technical field of energy, in particular to a method for depressurizing and starting an oxygen generator. Background technique [0002] In order to meet the needs of oxygen, nitrogen and argon products, high-volume oxygen generators are usually used to produce oxygen and nitrogen. Since the high-volume oxygen generators are designed with high and low pressure double-plate heat exchangers, if the operation is started in a normal cold state The process can easily lead to overpressure in the upper column of the rectification tower, and may even lead to bias flow of the plate heat exchanger, which directly affects the start-up efficiency and operation safety of the oxygen generator, affects the operating life of the oxygen generator, and increases the maintenance cost of the oxygen generator. , increase the operating cost of the oxygen generating unit. SUMMARY OF THE INVENTION [0003] The invention provides a depres...

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Problems solved by technology

[0003] The invention provides a method for starting an oxygen generator with reduced pressure. In order to solve a series of technical problems caused by the cold start of a traditional oxygen generator, the invention adopts the technology of starting an oxygen generator with reduced pressure to solve the problem of starting an oxygen generator with a double-plate heat exchanger process design. In the early stage, it is easy to cause overpressure and partial flow problems in the rectification tower, which ensures the stable start of the large oxygen generator in cold state, greatly reduces the impact of the oxygen generator startup on the air separation equipment, and effectively prolongs the service life of the air separation equipment

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