Intelligent control method for automatic optimization combustion of hot-blast stove

Abstract

The invention provides an intelligent control method for automatic optimization combustion of a hot-blast stove. Based on computation of total heat supply amount, by setting the target values of the temperature of a combustion arch top and the temperature of exhaust gas, an air-fuel ratio fuzzy controller optimizes optimal air-fuel ratio coefficients in a combustion period in real time to regulate the flow of combustion-supporting air and mixed gas in real time; the control of the flow of the combustion-supporting air is completed by an exhaust gas temperature regulator, a heat supply amount regulator and a combustion-supporting air regulator; the control of the flow of the mixed gas is completed by an arch top temperature regulator and a mixed gas regulator; and the control of the air-fuel ratio is completed by the air-fuel ratio fuzzy controller. The invention can improve the combustion control level of the hot-blast stove and has the advantages of high combustion efficiency, full utilization of energy sources and strong heat storage capacity.

Description

technical field [0001] The invention is used for the combustion control of the ironmaking blast furnace hot blast stove system in the metallurgical industry. Background technique [0002] The hot blast stove is an important supporting equipment in the blast furnace ironmaking production process. Its main function is to heat the blast to the required temperature and provide high-temperature hot air to the blast furnace. The blast furnace is generally supplied with air alternately by 3 to 4 hot blast stoves, and the working process of each hot blast stove is a repeated process of combustion and air supply. After the gas and combustion-supporting air are mixed in the burner, they are burned in the combustion chamber to generate high-temperature flue gas. The checker brick in the regenerator is the carrier of heat transfer, it absorbs heat during combustion, and transfers heat to cold air during air supply, thereby heating the cold air. [0003] In order to save energy and rea...

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Problems solved by technology

The proportional extreme value adjustment method cannot change the air-fuel ratio in time when the calorific value of the gas changes, and it is not easy to achieve the best combustion of the hot blast stove

The flue gas oxygen content cascade proportional control method uses the ratio adjustment as a rough adjustment, and the oxygen content feedback control in the flue gas as a fine adjustment to control the air and gas volume. This method can achieve a more reasonable combustion of the hot blast stove, but Due to the limited life of the oxygen measuring instrument, coupled with inadequate management and maintenance, the oxygen measuring instrument of many enterprises cannot work stably for a long time. Therefore, the application effect of this method is not ideal.

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