Combustion control method and system for hot blast heater

Abstract

The embodiment of the invention discloses a combustion control method and system for a hot blast heater. The control method comprises the steps of obtaining the dome temperature, the valve openness and the combustion control parameters of a hot blast heater in a combusting period in advance; judging whether the dome temperature, the valve openness and the combustion control parameters meet the optimal parameter example conditions; judging the combustion control parameters are the optimal combustion control parameters if the optimal parameter example conditions are met; judging whether the mean value variation of the combustion control parameters in the current preset time is larger than or equal to a preset variation threshold value and / or whether the continuous descending time of the dome temperature in the current preset time reaches a preset time threshold value; and adjusting the valve openness to the valve openness corresponding to the optimal combustion control parameters with the minimum difference of the combustion control parameters in the current preset time if the mean value variation is larger than or equal to the preset variation threshold value and / or the continuous descending time reaches the preset time threshold value. According to the technical scheme, the air-fuel ratio of the hot blast heater can be accurately adjusted in time, fuel gas of the hot blast heater can be fully combusted, the dome temperature of the hot blast heater is stabilized, and the utilizing level of the blast furnace air temperature is improved.

Description

technical field [0001] The invention relates to the technical field of hot blast stoves, in particular to a combustion control method and system for hot blast stoves. Background technique [0002] The hot blast stove of the ironmaking blast furnace is an important device used to heat the wind to a predetermined temperature, and then transport the wind to the blast furnace to improve the smelting efficiency of the blast furnace. Usually, the hot blast stove generally works in accordance with the cycle of burning-stove-supply-stove-stove-combustion. The basic working principle of the hot blast stove is: during the combustion period of the hot blast stove, firstly heat the checker bricks in the regenerator of the hot blast stove , when the checker bricks in the regenerator are fully heated, the hot blast stove changes from the heat storage state to the air supply state. During the air supply period, the heat is transferred to the cold air, so that the cold air is heated into ho...

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Problems solved by technology

[0006] The embodiment of the present invention provides a hot blast stove combustion control method and system to solve the problem that it is difficult to find the best air-fuel ratio in the method of manually adjusting the hot blast stove firing process in the prior art, which leads to large fluctuations in the temperature of the vault and burns the furnace. Poor effect, gas waste problem

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