Burning control heat balance technology for large blast furnace hot blast stove

Abstract

The invention discloses a burning control heat balance technology of a large blast furnace hot blast stove. Gas for the blast furnace hot blast stove is formed by mixing pipe network blast furnace gas and converter gas, and calculation of large blast furnace hot blast stove burning control heat balance is carried out based on a heat balance formula: Q<MG>+Q+Q<DW>-Q<Fm>-Q<L>=Q<HB>-Q<CB>, in the formula, Q<MG> is physical sensible heat brought by the mixed gas; Q is physical sensible heat brought by combustion-supporting air; Q<DW> is chemical heat generated by combustion; Q<Fm> is physical sensible heat taken away by flue gas; Q<L> is comprehensive heat loss; Q<HB> is physical sensible heat taken away by hot air; and Q<CB> is heat brought by cold air. The real-time heat balance calculation based on the second level of a PLC layer is realized, and the coal gas amount required by stove burning can be calculated according to the target air temperature, so that the burning of the hot blast stove is controlled, and the heat balance of burning and air supply is realized. According to the technology, the amount of coal gas needed by combustion of the hot blast stove can be well controlled, the needed high air temperature can be stably sent out, excessive heat storage of the hot blast stove can be reduced, heat loss is reduced, energy consumption is reduced, and energy conservation and cost reduction are achieved.

Description

technical field [0001] The invention relates to a combustion control technology of a blast furnace hot blast stove. Background technique [0002] The hot blast stove system is the main equipment system of the blast furnace system, and it is also the main energy consumption equipment in the blast furnace ironmaking production process, which consumes 40-45% of the blast furnace gas. It accounts for the main part of the energy consumption of the ironmaking process. With the continuous advancement of ironmaking technology, modern blast furnaces are developing in the direction of large size, high efficiency, and longevity. While increasing the blast temperature, energy consumption must also be reduced. According to investigations, in order to ensure high blast temperature in domestic large-scale blast furnace hot blast stoves, the heat storage capacity of hot blast stoves is often excessive, which increases the heat loss and heat waste of hot blast stoves and increases energy con...

AI Technical Summary

Problems solved by technology

According to the survey, in order to ensure the high blast temperature of the hot blast stoves in domestic large-scale blast furnaces, the heat storage of the hot blast stoves is often excessive, which increases the heat loss and heat waste of the hot blast stoves and increases energy consumption.

At present, the real-time heat balance calculation of the air supply and combustion of the hot blast stove has not been realized in China, so as to be used for the combustion control of the hot blast stove

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