Modeling and virtual simulating method for integrated coal gasification combined cycling air separating system

Abstract

A method for modeling and simulating an air separation system of an integral gasification combined cycle power plant comprises the following steps: building up an accurate mathematical model of a rectifying tower according to mass balance, energy balance, gas-liquid phase balance, molecular normalization equation and physical property equations set of each tower tray; and carrying out simulation experiment for the air separation system, including the cold-state startup process of the rectifying tower and the operation under variable working conditions, so as to study the dynamic operating characteristics of the rectifying tower, as well as the dynamic, static and coupling relations among the input, the output and the disturbance variables of the system. The method is considerably helpful for further understanding the operating characteristics of the air separation system, setting a control strategy for the air separation system and optimizing the operation. Moreover, the method can bring out profound impacts on the further study of the cooperative control of the air separation oxygen-generating system and other parts of the integral gasification combined cycle power plant, and an integral optimization design for the entire power plant.

Description

technical field [0001] The present invention relates to a method for modeling and virtual simulation of a low-temperature air separation system of an integrated coal gasification combined cycle power plant, in particular to a method for establishing an accurate mathematical model of a rectification tower, and to study air by setting input, output and disturbance variables. A method for separating system operation characteristics and control characteristics belongs to the fields of thermal power engineering, chemical industry and automatic control. Background technique [0002] The air separation system is an important part of the integrated coal gasification combined cycle power station, and it is also widely used in the fields of metallurgy, petroleum refining, chemical industry, electronics industry, aerospace and national defense. Cryogenic rectification of air is the main way to obtain high-purity industrial gases such as oxygen, nitrogen and argon. It is closely related...

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Problems solved by technology

[0015] Technical issues: In view of the large energy consumption of the air separation system of the IGCC power plant, the complex operating characteristics of the system, the current lack of understanding of its dynamic characteristics, the difficulty of establishing an accurate mathematical model for it, and the fact that it plays an important role in the entire IGCC power plant The present invention proposes a method for establishing an accurate mechanism model based on material balance, energy balance, gas-liquid phase balance, etc. for the air separation and oxygen generation system, as well as a method for virtual simulation thereof, in order to further understand It provides a method to study the operating characteristics of the air separation and oxygen generation system, and also lays the foundation for further research on its control characteristics, formulating optimal operation strategies, and finally reducing energy consumption

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