Automatic control method for combustion of cement decomposition furnace

Abstract

The invention relates to an automatic control method for combustion of a cement decomposition furnace. The automatic control method comprises the following steps: taking a temperature difference of the decomposition furnace, a change rate of the temperature difference, a content difference of waste gas CO, and a change rate of the content difference as input signals, and taking a coal feeding amount of a kiln head, a frequency of a high-temperature fan and an opening degree of a tertiary air valve as output signals; and establishing training and test sample data, and continuously modifying a weight through adopting a fuzzy neural network algorithm to enable the training and test sample data to be the same as actual output. The automatic control method disclosed by the invention is capable of greatly solving the problem of nonlinear, large-lag, multi-variable, multi-disturbance and nonlinear process. The automatic control method disclosed by the invention is capable of saving energy and reducing air pollution.

Description

technical field [0001] The invention relates to an automatic control method for combustion of a cement decomposition furnace, which belongs to the field of automatic control. Background technique [0002] The cement decomposition furnace is the core equipment on the cement production line, and it is also the key equipment for energy saving and consumption reduction. The most critical raw material calcination physical and chemical reactions in the cement production process are carried out in the kiln, and the decomposition of materials by the decomposition furnace will directly affect the materials of the rotary kiln. The quality of calcination affects the quality, output and energy consumption of cement clinker. The optimal control of energy consumption of cement calciner reflects the industrial and technical level of a country to a certain extent. The decomposition process of cement raw meal in the calciner is a complex process with large lag, multi-variable, multi-disturba...

AI Technical Summary

Problems solved by technology

[0003] In many small and medium-sized cement production enterprises in my country, the temperature process control of the calciner mainly adopts the method of manual adjustment, which has a low degree of automation and is restricted by factors such as the knowledge, experience and emotions of the operators. Indexes such as quality, output, and energy consumption may vary widely, making it impossible to unify and optimize the production process

Relatively low production efficiency, high energy consumption, unstable quality, and high labor intensity of operators are common problems in the cement industry

Most of the equipment used in large cement plants is controlled manually, and the automatic control also adopts the classic PID control algorithm. However, the PID control algorithm is not suitable for this complex process with large lag, multi-variable, multi-disturbance and nonlinear process.

At the same time, most cement plants only adjust the coal feeding at the kiln head and rarely adjust the wind

Therefore, every year the burning of coal in cement plants, ironworks and thermal power plants will produce toxic pollutants such as CO, S compounds and N compounds, among which CO will cause waste of fuel, causing great losses to the national economy and the national environment. cause great harm

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