Heating process control method of oxygenerator molecular sieve purifying system

Abstract

The invention discloses a heating process control method of an oxygenerator molecular sieve purifying system. The method comprises a heating procedure and a cold blowing procedure. The heating procedure comprises the following steps: turning off a heating electric furnace 4 to 8 minutes before the finish of the heating procedure, keeping opening of a heating valve and closed of a cold blowing valve, in a heating later stage time-delay phase, allowing dirty nitrogen to go through the electric furnace directly and bring out heat to a purifier, when the time-delay time is over, closing the heating valve and opening the cold blowing valve to enter the cold blowing procedure. According to the invention, through optimization of the molecular sieve control program, the heating later stage time-delay process is added in the program, a problem of overhigh temperature of the heating furnace hearth is solved, heating source of residual gas is fully utilized, power consumption is reduced, and long-term safe operation of the heating furnace is ensured.

Description

technical field [0001] The invention relates to a heating process control method of a molecular sieve purification system of an oxygen generator. Background technique [0002] Molecular sieve purification system is an indispensable and important process in the production process of air separation products. It can effectively absorb the moisture and carbon dioxide in the gas compressed by the air compressor, and ensure that the dry air after heating enters the heat exchanger and expander. The molecular sieve purification system is mainly composed of two purifiers, three 645kW electric heaters, thirteen electromagnetic switching valves, two pressure relief valves, and two pressure equalizing valves. Molecular sieves are generally divided into two groups, one group works, and the other group regenerates, and they are used alternately, generally 4 hours as a cycle. The air purification system is controlled by the control program strictly in accordance with the sequence of time ...

AI Technical Summary

Problems solved by technology

[0003] At present, the valves of the molecular sieve are automatically opened and closed by program control, which has some adverse effects on the normal operation of the electric heater during actual operation.

Specifically, when the molecular sieve is regenerated, the electric furnace is automatically turned on, and the FCV1201A valve (heating valve) is automatically opened, and the dirty nitrogen is heated to about 220 degrees Celsius and sent to the purifier to regenerate the molecular sieve. After the heating is completed, the electric furnace automatically stops heating, and the FCV1201A valve (heating valve) Close quickly, and the FCV1201B valve (cold blow valve) opens to send the dry dirty nitrogen gas into the purifier for cold blow; The temperature of the furnace chamber rises to 340 degrees Celsius, and it takes 2-3 hours for the temperature to drop slowly. Especially in summer, the ambient temperature is high, which will seriously affect the life of the electric heating tube and the electric furnace in the long run. The residual gas cannot be taken out of the electric furnace to participate in regeneration. The heat source cannot be used effectively, and the purpose of economical operation has not been achieved