Method for vaguely predicting, compensating and controlling tower top temperature during desulfurization of sintering flue gas

Abstract

The invention discloses a method for vaguely predicting, compensating and controlling tower top temperature during desulfurization of sintering flue gas. Aiming at the problem that the tower top temperature cannot be stably controlled due to the influence of system time delay and external disturbance during desulfurization of the sintering flue gas, the method comprises the following steps of: building a prediction model of the tower top temperature by using a heat transfer mechanism; designing a vague prediction and compensation controller of the tower top temperature by taking the difference between a prediction value and a set value as input; and compensating water injection quantity by using model rule. By the method, main disturbance in a system is introduced into the prediction model, and a compensation value is calculated according to the difference between the prediction value and the set value, so the problems of poor stability of the system caused by large fluctuation of disturbance factors and the time delay of the system are solved.

Description

technical field [0001] The invention relates to a tower top temperature fuzzy prediction compensation control method for sintering flue gas desulfurization process. Background technique [0002] As an important link in iron and steel smelting, sintering is the second largest energy consumer in iron and steel production. Sulfur dioxide (SO 2 ) emissions accounted for the first place in the total emissions, and its energy-saving and emission-reduction plays an important role in the energy-saving and emission-reduction of the iron and steel industry. At present, in the sintering desulfurization process, the semi-dry circulating fluidized bed is an important process. This process uses quicklime slurry to combine with SO 2 A chemical reaction occurs to absorb SO 2 role to reduce SO 2 Concentration, because the chemical reaction is an exothermic reaction, a relatively low temperature environment is an important factor determining the desulfurization efficiency. In engineering, ...

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a fuzzy prediction and compensation control method for tower top temperature oriented to the sintering flue gas desulfurization process. The problem that the system stability is too low due to too large

[0007] A tower top temperature fuzzy prediction and compensation control method for the sintering flue gas desulfurization process. On the basis of the original tower top temperature basic closed-loop control system, a tower top temperature prediction model is constructed, and a fuzzy prediction compensation controller is used to control the original tower top temperature. The temperature basic closed-loop control system implements compensation to solve the problems caused by system disturbance to the system;

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