Burning furnace air supply control method based on variable period prediction of hot blast stove

Abstract

The invention discloses a combustion furnace air supply control method based on hot blast stove variable period prediction. The method comprises the steps of obtaining and preprocessing historical data, building a variable air supply period model and generating a combustion strategy of a variable combustion period. By constructing a variable air supply period model, the air supply ending duration is predicted, the air supply temperature is guaranteed when air is supplied to the blast furnace, meanwhile, data of a combustion period and an air supply period in the previous production process are fully utilized for calculation processing, and the air supply period and the combustion period can be adjusted and changed according to the actual furnace combustion and air supply conditions; the limit values of the traditional fixed combustion period and the air supply period are broken through; the data of the combustion period and the air supply period are used as input variables for linkage analysis, the combustion strategy of the combustion period and the air supply strategy of the air supply period are correspondingly generated according to the analysis result, the temperature and the stability in the combustion and air supply process are guaranteed, the furnace is burnt by adopting the optimal coal gas-combustion air ratio, sufficient coal gas combustion is guaranteed, and the combustion efficiency is improved. And resource waste is avoided.

Description

technical field [0001] The invention relates to the technical field of blast furnace smelting, and specifically relates to a furnace air supply control method based on variable cycle prediction of hot blast furnaces. Background technique [0002] In the blast furnace ironmaking process, a large amount of combustion-supporting air needs to be injected into the blast furnace to promote the ironmaking reaction in the blast furnace. Because the internal temperature of the blast furnace is very high, the injection of normal temperature air will cause the temperature in the blast furnace to drop rapidly, which is not conducive to ironmaking. For the reaction to proceed, it is necessary to inject high-temperature air. The function of the hot blast stove is to heat the low-temperature combustion-supporting air to a high temperature. The working cycle of the hot blast stove is divided into a combustion period and an air supply period. [0003] Among them, the combustion period is ma...

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Problems solved by technology

(1) How to predict the end time of air supply by constructing a variable air supply cycle model, and also determine the combustion cycle of the combustion furnace at the same time, so as to ensure the temperature of the air supply when supplying air to the blast furnace, and make full use of the previous production process The data of the combustion cycle and the air supply cycle are calculated and processed to achieve the effect that the air supply cycle and the combustion cycle can be changed according to the actual combustion situation, and solve the problem of low air supply temperature and low temperature caused by the fixed combustion cycle and air supply cycle mechanism in the prior art. The problem of large temperature fluctuations;

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