Gas switching system of large titanium slag smelting fully-closed electric furnace

The invention relates to the technical field of titanium slag smelting totally-closed electric furnaces, in particular to a large titanium slag smelting totally-closed electric furnace gas switching system which comprises a fire-retardant valve and an overflow fire-retardant valve, gas pipelines are arranged on the outer sides of the fire-retardant valve and the overflow fire-retardant valve, and the gas pipelines are led into the fire-retardant valve and the overflow fire-retardant valve through gas conveying pipelines. A high-level liquid level switch and a low-level liquid level switch are mounted on each of the fire-retardant valve and the overflow fire-retardant valve; and a diffusion chimney is mounted at the top of the overflow fire-retardant valve. According to the gas switching system of the large-scale titanium slag smelting fully-closed electric furnace, safety switching of recovery pipelines is carried out on the gas of the electric furnace by adopting a water seal principle. Electric furnace gas