Oxygen-carbon ratio control system and gasifier oxygen-coal ratio control method thereof

Abstract

The invention relates to a gasifier oxygen-coal ratio control method based on prediction control. An oxygen-carbon ratio control system comprises a cascade loop taking synthetic gas ingredient as a controlled variable, the cascade loop comprises a main loop and an auxiliary loop, the main loop comprises a main loop controller, the auxiliary loop is a powdered coal flow adjusting loop, the main loop controller comprises a synthetic gas ingredient controller, the auxiliary loop comprises a powdered coal controller, the synthetic gas ingredient controller is connected with the powdered coal controller which is sequentially connected with a powdered coal adjusting valve, a powdered coal pipeline and a gasifier, and the synthetic gas ingredient controller is controlled by a prediction controller. In the oxygen-carbon ratio control system, oxygen flow is determined by load of the gasifier, the synthetic gas ingredient controller determines oxygen-coal ratio according to the measured synthetic gas ingredient, and then the oxygen-coal ratio is multiplied with the oxygen flow to acquire a set value of powdered coal flow. By the gasifier oxygen-coal ratio control method, optimized automatic control of the oxygen-coal ratio is realized, safe and reliable running of the gasifier is guaranteed, and large-scale application and popularization of the gasifier are promoted.

Description

technical field [0001] The invention belongs to the technical field of automatic control, and relates to an oxygen-carbon ratio control system and a method for controlling the oxygen-coal ratio of a gasifier. Background technique [0002] At present, in thermochemical reaction engineering and thermal power engineering, pulverized coal pressurized gasification technology is an important clean energy production method, and the gasifier is the core equipment of the coal gasification process. The gasification technology using pulverized coal as raw material has technical advantages such as wide adaptability of coal types, low raw material consumption, and high carbon conversion rate, and has stronger market competitiveness. The pulverized coal pressurized gasification process uses pulverized coal and pure oxygen as raw materials to carry out partial oxidation reaction in the gasifier under high temperature, high pressure and non-catalytic conditions to generate crude synthesis g...

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Problems solved by technology

[0003] The purpose of the present invention is to provide an oxygen-carbon ratio control system and its gasifier oxygen-coal ratio control method, which solves the complex chain logic in the prior art, and a slight deviation will cause the device to stop or even explode, especially When the load is increased, the system is prone to overoxygen, which has potential safety hazards, and the corresponding control theory and application are immature. At the same time, it is solved that for a large lagging object such as the gasifier, the control function does not act in advance, and it is impossible to obtain impressive results. Satisfactory control effect and other issues; realize the optimization and automatic control of the oxygen-coal ratio, ensure the safe and reliable operation of the gasifier, and promote the large-scale application and promotion of the gasifier

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