Method for optimizing cold box and demethanizer system in sequential separation flow of cracked gas

Abstract

The invention provides a method for optimizing a cold box and a demethanizer system in a sequential separation flow of cracked gas. The method solves the problem that the consumption of refrigerants of different temperature levels cannot be correspondingly adjusted together with the load change of cracked raw materials and the cracked gas in the prior art. Reasonable matching of the refrigerants of different temperature levels in the cold box and the demethanizer system according to the real-time and historical running data of an industrial device is realized, and ethylene loss of the cracked gas in the system is further reduced. The optimizing method can be universally applied to the refrigerant matching problem of the cold box and the demethanizer system in the deep cold separation flow of an ethylene device.

Description

1. Technical field [0001] The invention belongs to the field of chemical engineering, and relates to an optimization method for a light hydrocarbon mixture cryogenic separation process, in particular to the optimization of a cold box and a demethanizer system. 2. Background technology [0002] Ethylene is one of the most important basic organic raw materials in the petrochemical industry. It plays an important role in my country's national economy and social development. Hydrocarbon pyrolysis is the main method of producing ethylene in China at present. With the continuous development and expansion of my country's chemical industry, the increasing demand for ethylene in industrial production and the increasingly tight international oil supply, increasing the ethylene production rate in the cracking reaction process and reducing the ethylene loss rate in the product separation process have become the most important domestic ethylene products. It is the main indicator for manu...

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Problems solved by technology

[0010] The purpose of the present invention is: aiming at the deficiencies existing in the existing pyrolysis gas cooling box and demethanizer system, a simple, easy-to-implement optimization method for reducing the ethylene loss in the cryogenic separation process of the cracked gas mixture is proposed, and it is successful Solve the adverse effects caused by cracking raw materials and cracking gas load changes on the cracking gas cryogenic process, so as to reduce the ethylene loss in the cryogenic separation process and ensure the stable operation of the ethylene plant

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