Automatic control system of blast furnace hot blast stove combustion process

Abstract

The invention relates to an automatic control system during the combustion process of a hot air furnace of a blast furnace, belonging to the field of automatic combustion control technique of the hot air furnace of the blast furnace. Firstly, the system self-learns the historical combustion data of the furnace according to the specified conditions, and determines the best coal gas and air flux of the furnace and the best initial openness of an adjusting valve to be as the initial parameters of the next combustion period. During the normal combustion stage, a control method that fuzzy control is combined with self-optimization control is adopted, the fastest increment of the temperature at the arch is taken as the object, and the air combustion proportion coefficient is quickly optimized according to the temperature change of the combustion chamber. Simultaneously, by adopting a non-difference self-adaptive single closed ring control system combined with the methods such as fuzzy control, self-learning and pulse driving and the like, the action of the adjusting valve can be effectively controlled, and precise and quick adjustment and control of the flux are realized. According to the trend change of the temperature of the waste gas, the system adopts the fuzzy control arithmetic to control the combustion rhythm. Simultaneously, the system comprehensively summarizes the manual combustion experience and achieves the object of completely automatic control without man-watching during the whole combustion process.

Description

technical field [0001] The invention belongs to the field of automatic combustion control of blast furnace hot blast stoves, in particular to a set of special control methods for automatic combustion control of hot blast stoves based on the combination of self-learning and fuzzy control. Background technique [0002] The hot blast stove is an important part of the blast furnace smelting system, and it undertakes the important task of providing hot blast for the blast furnace. Due to the complexity of the combustion process of the hot blast stove and the limitations of the process equipment, the automatic control of the hot blast stove has not been solved. [0003] The control process of hot blast stove mainly includes furnace replacement control and combustion control. Furnace replacement control technology is very mature and has been widely used in actual production. The combustion control of the hot blast stove includes automatic control of the entire combustion process, ...

AI Technical Summary

Problems solved by technology

However, the primary issue in summarizing the control rules is the completeness and scientificity of the rules, which restricts the adaptability of the system.

The method of adjusting the combustion cycle based on the case library faces problems such as complex changes in process conditions, and difficulty in ensuring the integrity and representativeness of the case library.

At the same time, the above control method only focuses on the optimization of the air-fuel ratio and the control of the combustion speed, but does not involve the automatic interlocking control of the combustion process and other issues.

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