Divided-period and multi-stage matching and optimizing method for operation parameters in furnace burning process of blast furnace and hot blast furnace

Abstract

The invention provides a divided-period and multi-stage matching and optimizing method for operation parameters in the furnace burning process of a blast furnace and a hot blast furnace. The method builds up historic databases of state parameters (the dome temperature, the smoke temperature, the dome temperature changing rate, the smoke temperature changing rate, the coal gas pressure, the air pressure and air-fuel ratio) and operation parameters (the coal gas valve opening degree and the air valve opening degree) on the basis of analyzing influences on inner operating and air supply results made by an air-fuel ratio set value in the furnace burning process, puts forward an efficiency evaluation method of the furnace burning process of the hot blast furnace by combining the air supply results, and explores excellent furnace burning times. The model matching spaces are built up by integrating the density peak value to seek for a clustering and correlation analysis method rapidly, divided-period and multi-stage matching is conducted according to the similarity of the state parameters, the optimal operation parameters in each stage of furnace burning is sought, and the purposes of saving coal gas consumption, improving the air supply temperature and ensuring the air supply duration are achieved.

Description

technical field [0001] The invention relates to the technical field of optimal control of blast furnace hot blast stoves, in particular to a multi-stage matching optimization method for operation parameters of blast furnace hot blast stove firing process. Background technique [0002] The large-scale hot blast stove is one of the important components of the modern blast furnace ironmaking system, which mainly provides continuous and stable high-temperature hot blast for the blast furnace. According to statistics, every time the hot air temperature increases by 100°C, the combustion temperature of the tuyeres can be increased by 20-300°C, the output can be increased by 3%-5%, the coke ratio can be reduced by 4%-7%, and the injection of pulverized coal can be increased by 15-40Kg / t. That is, increasing the air temperature of the hot blast stove is of great significance to the realization of low-carbon and high-efficiency production in the blast furnace ironmaking process. T...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a multi-stage matching optimization method for operating parameters in the blast furnace hot blast stove firing process, so as to solve the existing technical problem that the traditional method cannot establish an accurate mathematical model to calculate the optimal air-fuel ratio and operating parameters

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