Blast furnace gas catalytic combustion equipment and method for pure blast furnace gas burning

Abstract

The invention discloses blast furnace gas catalytic combustion equipment and a method for purely combusting blast furnace gas. Dirty blast furnace gas from the top of an iron making blast furnace enters a heat exchange channel of a secondary cooler and then is cooled down. Supplementing water flows onto filtering cloth from a supplementing water pipe and then flows into a rear section of a double-U isolation pipe. Quicklime powder in a quicklime powder tank is downwards dropped onto a fluidized bed from a dropping pipe through an electric rotary valve; then the quicklime powder falls into slaked lime water in the rear section of the double-U isolation pipe. The dirty blast furnace gas enters from a pipeline under a front section of the double-U isolation pipe and penetrates through the slaked lime water in the rear section of the double-U isolation pipe, so that the slaked lime water is boiled. The quicklime powder penetrating through the fluidized bed is used for removing acidic gas and water vapor. Nitric oxide is removed by ammonia gas. A cloth bag dust remover and an electrostatic dust remover are used for removing dust. Then the gas enters a pre-mixing chamber through an axial flow draught fan, and enters a combustion layer of the blast furnace gas catalytic combustion equipment, which is heated by air plasma flame or fuel gas, so as to be ignited. The air or rich oxygen enters the combustion layer to support the combustion of the blast furnace gas.

Description

Technical field: [0001] The invention relates to a blast furnace gas catalytic combustion equipment and a method for purely burning blast furnace gas. Background technique: [0002] The content of carbon monoxide in the combustible gas of blast furnace gas accounts for 25%, and there are also a small amount of hydrogen and methane gas. Blast furnace gas carbon dioxide accounted for 15%, nitrogen accounted for 55%. Due to the low content of combustible gases in the blast furnace gas, the blast furnace gas injected from the nozzle cannot be ignited in the air at normal temperature. Therefore, it must be mixed with coke oven gas or converter gas with high combustible gas content before it can be ignited after being sprayed from the nozzle in the air at room temperature. However, the calorific value of blast furnace gas mixed with coke oven gas or converter gas is not high, and the temperature of the air used to preheat the hot blast stove before heating is not high; and coke ...

AI Technical Summary

Problems solved by technology

However, the calorific value of blast furnace gas mixed with coke oven gas or converter gas is not high, and the temperature of the air used to preheat the hot blast stove before heating is not high; and coke oven gas produced by coke oven or converter gas produced by converter is not Not much, there is no way to ration all the blast furnace gas, only half of the blast furnace gas is rationed, so the other half of the blast furnace gas has to be vented to high altitude

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