Ammonia plant refrigeration system and process control method th

Details Ammonia plant refrigeration system and process control method th Ammonia plant refrigeration system and process control method th

1982-10-08

1984-11-27

Wayner, William E.

Refrigeration

Automatic control

Refrigeration producer

622284, 62475, F25B 4304

Patent

active

044844530

ABSTRACT:
A method for maintaining a preselected concentration of non-condensible gases in a condenser is disclosed. A compressor supplies the condenser with compressed ammonia. The compressed ammonia includes non-condensible gases. At least a portion of the compressed ammonia condenses, forms condensed ammonia and exits the condenser. A pressure controller operates an automatic valve to vent at least a portion of the non-condensible gases from the condenser. A temperature element senses the condensed ammonia temperature and sends a signal, based upon the condensed ammonia temperature, to the pressure controller. The pressure controller uses the signal to reduce the pressure of the condenser from a predetermined value to a computed value estimated to be necessary to maintain the preselected concentration of non-condensible gases in the condenser. The pressure controller also senses actual pressure in the condenser, compares such actual pressure to the computed value of pressure and makes adjustments to the automatic valve until the actual pressure in the condenser is approximately equal to the computed value. The effect of maintaining the preselected concentration of non-condensible gases is to minimize energy requirements of the compressor over time.

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patent: 4325223 (1982-04-01), Cantley
Hydrocarbon Processing, Nov. 1981, Ammonia.

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