During the smelting process of medium frequency furnace, a large amount of smoke and dust will be emitted into the air, seriously polluting the environment and affecting the health of workers. From the point of view of the design of the smelting process flow of the medium frequency furnace, the low-level mobile dust collector + charging equipment + tapping equipment + dust removal equipment can be used to efficiently capture the flue gas in the whole smelting process of the medium frequency furnace.

The flue gas collection system of intermediate frequency furnace is composed of low-level mobile dust collection hood, feeding equipment, tapping equipment and dust removal equipment. The low-level mobile dust collector covers the operating platform and tapping pit, so that the smelting production process of the intermediate frequency furnace is carried out in the low-level mobile dust collector, realizing the effective capture of the whole process of flue gas. During feeding, the feeding equipment is used for feeding, and the materials are filled up several times according to the production needs, which solves the problem that the flue gas is difficult to catch when the crane is feeding; During tapping, the medium frequency furnace platform turns over and directly goes out into the ladle on the tapping track flat car. The tapping process is completed in the smoke hood, which overcomes the leakage of flue gas during tapping of local dust collecting hood.

Comparison of several commonly used capture forms at present

At present, the flue gas capture form of domestic medium frequency furnaces is mainly the umbrella rotating cover, which is set above the furnace mouth and rotates back and forth with the center lines of two medium frequency furnaces. When feeding, the rotating cover is removed and the feeding is directly carried out by the crane; During tapping, the furnace platform of the intermediate frequency furnace is turned forward, and the furnace mouth is outside the umbrella cover mouth. In these two cases, the umbrella cover is in the out of position state, which can not effectively remove the flue gas, causing the flue gas to directly rush to the roof. Due to the frequent feeding times, the effective working time of the umbrella cover is very short, and the capture rate is about 50%.

Some manufacturers consider using the secondary dust removal on the roof to solve the residual smoke emitted in the workshop due to the failure of the umbrella cover to capture. The secondary dust removal is to arrange a number of suction hoods on the roof of the plant to exhaust the remaining smoke through an independent dust collector. During actual use, the following problems are easy to occur: high air volume requirements of the system, large equipment investment, slow wind speed at the hood opening of the air suction hood, and no obvious smoke removal effect. Especially in the case of low atmospheric pressure in winter, the residual smoke emitted is deposited at the bottom of the workshop and cannot reach the roof, and the air suction hood on the roof is in vain.