Coal water slurry gasification process DMC-PID multivariable control method

Abstract

The invention relates to a coal water slurry gasification process DMC-PID multivariable control method, concretely a coal water slurry gasification process multivariable control method by employing a dynamic matrix control and proportion-integral-differential control cascade control system (hereinafter referred to as a DMC-PID control method). A coal water slurry gasification process control system is characterized in that charging flow control mainly comprises coal water slurry flow cascade control and oxygen coal ratio cascade control; the core of vaporizer control is gasifier hearth temperature control; quenching chamber control mainly comprises quenching water flow and raw gas temperature cascade control. In the adjustable range of manipulated variables, the DMC-PID control method can control coal gasification process main manipulated variables in an industrial requirement range, thereby effectively solving the problems such as multivariable coupling between a gasification temperature and a synthetic gas yield in a coal water slurry gasification process.

Description

technical field [0001] The invention relates to a process control method in the fields of coal chemical industry and automatic control, in particular to a DMC-PID multivariable control method for a coal-water slurry gasification process. Background technique [0002] my country is rich in coal resources. In 2013, the proven reserves of coal resources were 114.5 billion tons, ranking third in the world. However, the overall efficiency of my country's coal utilization rate is low and the pollution is serious. Coal gasification technology is the core technology for clean and efficient conversion of coal. Compared with traditional coal resource utilization technology, coal gasification technology has absolute advantages in environmental protection and efficient resource utilization. Therefore, coal gasification technology has been widely used in industry. [0003] In the coal gasification process, the gasifier is the core equipment of the coal gasification process. The chilled...

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Problems solved by technology

However, since the steam methane reforming reaction and the partial oxidation of carbon produce more CO, more CO will promote the oxidation reaction of carbon monoxide and the water gas reaction to proceed forward, thereby further increasing the temperature and increasing the h 2 output, while H 2 The increase will further affect the steam methane reforming reaction and the partial oxidation reaction of carbon

In fact, since coal gasification is a complex chemical reaction process involving multiphase interactions at high temperature and high pressure, the coal gasification process is affected by coal composition, gasification conditions (such as gasification temperature and gasification pressure), coal slurry concentration, etc. The coupling relationship will be more complicated due to the influence of multiple variables. The above problems are difficult to be effectively solved by the conventional PID control method.

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