Metallurgy method for ultrahigh-temperature heating of coal gas at tuyere of oxygen blast furnace

Abstract

The invention discloses a metallurgical method for ultrahigh-temperature heating of coal gas at an oxygen blast furnace tuyere. The metallurgical method comprises the following steps: pressurizing blast furnace decarburized coal gas to 0.5-0.8 MPa through a pressurizing machine; the pressurized high-pressure cold coal gas is introduced into the coal gas bustle pipe and enters the blast furnace tuyere front connecting pipe; the high-pressure cold coal gas in the connecting pipe is introduced into the plasma rectangular body to be heated; the heated high-temperature coal gas is conveyed into the tuyere air supply device through the plasma rectangular nozzle; high-temperature coal gas is fed into the blast furnace through an air supply device to finish the metallurgical process; carrying out decarburization treatment on the metallurgical blast furnace top gas; the decarburized top gas is continuously reused; according to the method, the blast furnace metallurgical gas is heated by using the plasma moment, so that the carbon consumption of a part of heat released by a blast furnace carbon reaction can be replaced, the metallurgical coke ratio and the coal ratio can be reduced, the coke ratio reaches 200-240 Kg/t, the coal ratio reaches 60-100 Kg/t, and the production cost is reduced.

Description

technical field [0001] The invention relates to the field of blast furnace metallurgy, in particular to a metallurgical method for super-high-temperature heating of coal gas at a tuyere of an oxygen blast furnace. Background technique [0002] The hot blast heating furnace required for traditional blast furnace ironmaking adopts the hot blast furnace heating mode, and the heating medium is mostly pressurized air containing 21% oxygen, and the furnace gas and combustion-supporting air are used to burn in the hot blast stove combustion chamber. Checker bricks, when the temperature of checker bricks rises to 1250-1400°C, the furnace operation is stopped, and cold air is blown in from the cold air inlet of the hot blast furnace. The air mixing valve is mixed with the cold air in a certain proportion, and the mixed air reaches the temperature required by the user, and finally sent to the blast furnace. Generally, the maximum temperature of the hot air sent in is about 1200°C. ...

AI Technical Summary

Problems solved by technology

[0003] In order to reduce the carbon consumption of blast furnaces, Bayi Iron and Steel Co., Ltd. has developed a top-coal gas circulation oxygen blast furnace, which will replace the traditional blast smelting with full-oxygen smelting, and will recycle the output low-nitrogen gas after removing carbon dioxide to achieve the purpose of reducing carbon consumption. In 2020, Bayi Iron & Steel has achieved a 35% breakthrough in high hydrogen-enriched smelting technology in the first phase. In 2021, it has completed 50% of its ultra-high oxygen-enriched smelting target. The low-temperature (25°C) gas

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