Black liquor combustion optimizing control system

Abstract

The invention relates to a black liquor combustion optimizing control system, comprising an input interface module, an input isolation module, an A / D conversion module, an algorithm module, a processor module, a D / A conversion module, an output isolation module and an output interface module which are sequentially connected. The input interface module acquires signals of furnace negative pressure, furnace temperature and black liquor flow in a black liquor incinerator and smoke oxygen concentration. The acquired signal is process by the isolation module and conversion module and then is sent to the processor module. The processor module calls a mathematical model of the algorithm module, the acquired signals are calculated, analyzed and processed, the processed data is stored and output, and the output data controls primary blowing rate, secondary blowing rate, tertiary blowing rate and black liquor flow by virtue of the conversion, output isolation and output interface modules, so as to realize optimal combustion of black liquor incinerator. By adopting the system, combustion efficiency of black liquor incinerator can be further improved, energy consumption can be reduced, and pollutant emission can be reduced; meanwhile service life of incinerator is prolonged, and economic benefit and environmental benefit of alkali recovery plant.

Description

technical field [0001] The invention belongs to the field of papermaking, and relates to a black liquor combustion optimization control system for a combustion section of an alkali recovery workshop of a paper mill or a pulp mill. Background technique [0002] Paper mills or pulp mills will produce a large amount of waste liquor in the production process. Because it appears black, it is called black liquor. Black liquor contains a large amount of chemicals and various harmful substances, and direct discharge will cause great harm to the environment. [0003] At present, black liquor incinerators are equipped with a conventional DCS control system, which enables automatic control of the black liquor combustion process, but such a control level is very conservative, and lacks optimization of the air distribution and batching methods for boiler combustion operation. At present, the control of the black liquor combustion process is mainly to improve the chemical recovery effici...

AI Technical Summary

Problems solved by technology

During the combustion process, the air volume is affected by factors such as black liquor composition, flow, pressure, and properties, and other disturbance factors in the entire dynamic process of incineration will also interfere with the control of air volume.

[0006] At present, there is no optimization control for black liquor combustion in China; through searching, no open technical documents identical or similar to this patent application have been found

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