Harmonization control method for blast furnace hot blast stove system

Abstract

The invention relates to compatible control method for hot-blast stove of blast furnace, which comprises: determining the lowest blast temperature, designing correlated process parameters and constructing case database; extracting burning data to add into database; obtaining real-time process parameters; with case-base inference method, predicting the time that blast temperature drops down to lowest temperature as the blast end time and the burning terminal time of successive furnace; comparing the predicted time with preset terminal time of successive furnace; according to result, changing gas supply to achieve the waste gas temperature upper limit with set terminal; repeating said steps to realize the variable-period running. This invention increases total blast temperature, and reduces blast temperature.

Description

technical field [0001] The invention belongs to the technical field of automatic combustion control of blast furnace hot blast stoves, and in particular relates to a coordinated control method for ironmaking blast furnace hot blast stove systems based on hot blast temperature prediction. Background technique [0002] The blast furnace hot blast stove is an important equipment in the blast furnace ironmaking production, and it undertakes the key role of transferring the heat generated by burning gas to the blast furnace blast. A blast furnace hot blast stove system usually consists of 3 to 4 hot blast stoves, and the working process of each hot blast stove is divided into three stages: combustion, furnace replacement and air supply. Several hot blast stoves work alternately in the air supply state in order to achieve the purpose of providing continuous and stable hot blast supply to the blast furnace. [0003] For each hot blast stove of a hot blast stove system, its working...

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Problems solved by technology

Therefore, if a fixed combustion time and air supply time are adopted, it will also cause large fluctuations in the temperature of the hot air;

[0007] 3) Regardless of whether it is due to individual differences in hot blast stoves or changes in the calorific value of gas, if the hot blast stove system adopts a fixed-period operation mode, then the hot blast stove that has accumulated a lot of heat in the combustion stage cannot fully release its heat in the air supply stage. Unnecessarily released, so that the gas consumption increases, resulting in unnecessary waste of energy

[0015] A common shortcoming of the existing hot blast stove control methods is that they only consider the individual control problem of a single hot blast stove, but ignore the hot blast stove as a system to solve the problem from the perspective of the whole

In fact, the heat storage capacity of each hot blast stove in a hot blast stove system is different, and the calorific value of blast furnace gas also varies greatly, so the fixed cycle operation mode cannot guarantee the overall air supply of the hot blast stove system The effect is optimal

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