When the blast furnace is overhauled, the furnace does not turn off, and it is full of hot coke. Although the blast has stopped, the lower part of the furnace shaft and tuyere can not be completely sealed, and a small amount of air still penetrates into the furnace, which produces a small amount of carbon monoxide after contacting with red coke. Therefore, during the whole blast furnace cooling process, blast furnace gas is still produced, which escapes from the top of the furnace and accumulates to a certain extent, which will endanger the safety of maintenance personnel.

Blast furnace maintenance is a multi-storey operation at high altitude, and 40% of casualties are caused by falling from high altitude, so preventing falling is one of the key points of blast furnace maintenance safety work.

When the blast furnace is overhauled, it is necessary to reduce the material level. In the process of blanking, the top temperature is getting higher and higher. In order to protect the top equipment, it is necessary to pump water into the furnace to reduce the top temperature. After drawing water, a large amount of steam is produced in the furnace, and the hydrogen content in the gas increases, which increases the explosion coefficient. Therefore, attention should be paid to the safety control of water during the whole blanking process to prevent a strong explosion accident.

After the blast furnace is cooled, there is still gas in the furnace, which may poison maintenance workers or explode. Therefore, before cooling and maintenance, the explosion hole on the top of the furnace should be opened and the top gas should be ignited. In the process of maintenance, we should continue to keep an open flame burning on the top of the furnace.

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