Device and process for preventing excessive temperature of gas inlet and air inlet of top combustion hot blast stove

Abstract

This invention belongs to the field of blast furnace ironmaking technology and discloses a device and process for preventing excessively high temperatures at the gas inlet and air inlet of a top-fired hot blast stove. The device includes a temperature detection unit, comprising a first temperature detection device at the gas inlet and a second temperature detection device at the air inlet; a cooling medium supply unit, including a nitrogen pipeline and a compressed air pipeline; a gas-side purging branch, with its inlet end connected to the nitrogen pipeline and its outlet end connected to the rear side of the gas pipeline combustion valve, and a first pneumatic shut-off valve installed on the branch; an air-side purging branch, with its inlet end connected to the compressed air pipeline and its outlet end connected to the rear side of the air pipeline combustion valve, and a second pneumatic shut-off valve installed on the branch; and a control unit electrically connected to each detection device and pneumatic valve. When any inlet temperature exceeds a set value, the corresponding pneumatic valve is opened, and cooling medium is introduced to push the high-temperature flue gas back into the loop; when the temperature drops to a safe value, the pneumatic valve is closed. This invention achieves active, on-demand control of the gas and air inlet temperatures.

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