Refrigerating capacity analysis based energy-saving benefit computing method of cryogenic liquid expansion machine

Abstract

The invention discloses a refrigerating capacity analysis based energy-saving benefit computing method of a cryogenic liquid expansion machine. The inlet and outlet pressure and temperature of the liquid expansion machine are firstly acquired; the unit refrigerating capacity of the liquid expansion machine is computed; then the inlet and outlet pressure and temperature of a gas expansion machine are acquired; the unit refrigerating capacity of the gas expansion machine is computed; based on the principle that the refrigerating capacity is not changed before and after the liquid expansion machine is additionally arranged in an air separation device, the air treatment capacity needing to be added for the gas expansion machine when the liquid expansion machine is not used is computed, and then the compressed air amount which should be added by a supercharger is obtained; and extra power consumed by the supercharger is computed and obtained accordingly, power output by a recovery throttlepressure head of the liquid expansion machine is considered, and computing to the comprehensive energy-saving benefit generated after the liquid expansion machine is additionally arranged on the air separation device is achieved. The simple and convenient method is provided for the energy-saving benefit analysis after the liquid expansion machine is additionally arranged on the air separation device, and great significance is achieved on promoting large industrial air separation technical progress and air separation device energy saving and consumption reduction.

Description

technical field [0001] The invention relates to the field of high-energy-consuming industrial low-temperature air separation, relates to a technology for reducing energy consumption of an air separation device by using a low-temperature liquid expander, and in particular relates to a method for calculating energy-saving benefits of a low-temperature liquid expander based on cooling capacity analysis. Background technique [0002] Large-scale industrial air separation units generally use advanced internal compression air separation processes. The liquid air discharged from the main heat exchanger in the internal compression air separation process is a low-temperature and high-pressure medium, usually up to tens of atmospheres, and needs to be throttled and depressurized. Then enter the lower column rectification process. This throttling process is usually completed with a high-pressure throttling valve, which makes the throttling energy dissipated in vain in the low-temperatu...

AI Technical Summary

Problems solved by technology

The present invention relates to a method for quickly calculating the energy-saving benefit of a liquid expander based on the analysis of cooling capacity. However, no method for evaluating the energy-saving benefit of a liquid expander based on the analysis of cooling capacity has been found at home and abroad.

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