Flow cooperative control method and control system device for shift gas and unshifted gas of gasification furnace

Abstract

The invention provides a flow cooperative control method and a control system device for shift gas and non-shift gas of a gasification furnace. When an unconverted gas flow regulating valve position is in an effective control interval, a converted gas regulating valve controls the unconverted gas flow regulating valve position through integration, so that the unconverted gas flow regulating valveposition is in the intermediate value of the effective control interval; and when the unconverted gas flow regulating valve position is out of the effective control interval, the converted gas regulating valve controls the unconverted gas flow regulating valve position through proportional integral differential, so that the unconverted gas flow regulating valve position returns to the effective control interval. According to the invention, different control strategies are used according to different intervals where the unconverted gas flow regulating valve positions are located, the coupling between two flows is overcome, the converted gas flow and the unconverted gas flow can be rapidly and stably adjusted according to load changes, fluctuation of downstream devices due to untimely flow adjustment is avoided, and meanwhile the operation amount of device personnel is reduced.

Description

technical field [0001] The invention belongs to the technical field of flow control, and relates to a flow coordinated control method and a control system device, in particular to a flow coordinated control method and a control system device for gasifier shifted gas and unshifted gas. Background technique [0002] The coal gasification process is one of the main ways to produce syngas products. The solid coal is converted into gaseous syngas through the gasification process, and by-products such as steam and ash are produced at the same time. The stable operation of the coal gasification plant is very important to the downstream users. Optimizing the process control and improving the automatic control level of the plant can not only reduce the work intensity of the plant operators, but also improve the stability of the plant operation. Further parameter optimization can be carried out on the basis of stable control , to meet the needs of energy saving and consumption reducti...

AI Technical Summary

Problems solved by technology

However, when the load changes and needs to be adjusted, the ability to adjust the unconverted gas flow is limited. When the valve of the control circuit is too large or too small, the flow of the circuit cannot be effectively controlled. It is necessary to manually adjust the valve position of the converted gas, which requires manual intervention. Many, and there is a problem of untimely adjustment

Because the flows of these two streams are coupled with each other, parameters such as flow rate and pressure difference need to be considered when changing the air stream. There are many factors to consider. Single-loop control cannot meet the demand and requires more manual intervention.

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