A high-efficiency and energy-saving hot blast furnace firing method

Abstract

The invention especially relates to a high-efficiency energy-saving hot blast stove combustion method, belonging to the technical field of blast furnace iron making in the steel industry. According tothe invention, conventional hot blast stoves and process parameters thereof do not need to be changed; the temperature of combustion air used in the combustion of a hot blast stove and an air-fuel ratio are increased so as to increase the total combustion amount of the hot blast stove; during stove changing of the hot blast stove, the amount of coal gas introduced into the hot blast furnace in the state of single combustion is maximized, and the air-fuel ratio and the amount of the combustion air are increased, so the hot blast stove is allowed to reach a high blast temperature under the condition of limited usage amount of the coal gas. Thus, under the condition of substantial reduction in coal gas consumption, the service life of the hot blast stove is not influenced; the hot blast stove is ensured to reach a high blast temperature; the power outsourcing of enterprises is reduced; and cost per ton of steel is lowered.

Description

technical field [0001] The invention relates to the technical field of blast furnace ironmaking in the iron and steel industry, in particular to a high-efficiency and energy-saving hot blast furnace firing method. Background technique [0002] The blast furnace hot blast stove is an important accessory equipment of the blast furnace in the ironworks. Its working principle is to burn the gas first, use the generated flue gas to heat the checker bricks in the regenerator, and then pass the cold air through the hot checker bricks for heating, and then turn the hot blast stove Combustion and air supply are carried out alternately, so that the blast furnace can continuously obtain high-temperature hot air, so as to ensure that the coke burned in the blast furnace can reduce the iron oxide in the iron ore to metallic iron, which can reduce the coke ratio and increase the output. With the large-scale blast furnace, blast furnace ironmaking technology is developing in the direction ...

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Problems solved by technology

[0003] However, to achieve high wind temperature requires a large amount of gas consumption, and the production cost is relatively high

If the consumption of gas is reduced, the temperature of the hot blast will drop sharply and there will be large fluctuations during the furnace replacement cycle, and the temperature of the lower and middle upper parts of the hot blast stove will drop sharply, and at the same time it will cause the hot blast stove to burn during the combustion period and the air supply. If the temperature difference increases during the period, the temperature of the upper part of the hot blast stove will fluctuate repeatedly between lower than 600°C and higher than 600°C. The refractory material built in the middle and upper part of the hot blast stove is silicon, so the life of the hot blast stove will be greatly affected by repeated repetitions.

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