Air-cooled magnetic discharge structure and discharge method for rotary hearth furnace

Abstract

The invention discloses an air-cooled magnetic discharge structure of a rotary hearth furnace and a discharge method thereof. The second partition wall located at the outlet of the discharge area, between the first partition wall and the second partition wall, N 2 Vertical air-cooled sector and magnetic ejector sector; the N 2 The vertical air-cooling sector and the magnetic discharge device sector are also equipped with their own furnace internal and external devices. The present invention adopts the static installation in the furnace, without high-temperature movement and parts in contact with hot materials, so its service life will be greatly extended, avoiding the disadvantages of traditional water-cooled spirals, saving downtime for maintenance, and saving expensive spare parts and With a large amount of manual repair costs, the operation rate and production efficiency of the rotary hearth furnace will be greatly improved, which meets the requirements of green production.

Description

technical field [0001] The invention relates to a rotary hearth furnace for processing metallurgical iron-containing dust and sludge, and more particularly, to an air-cooled magnetic discharge structure of the rotary hearth furnace and a discharge method thereof. Background technique [0002] At present, the mainstream process of iron and steel enterprises in the treatment of metallurgical solid dust and sludge waste is the rotary hearth furnace process. The heating and reduction effect of the ferrous alloy makes it transformed into a metallized pellet with a certain metallization rate, that is, after the pellet is reduced by the rotary hearth furnace, it becomes a pellet containing metallic iron. Since the rotary hearth furnace is a high-temperature furnace, the furnace temperature Above 1000 ℃, the metallized pellets that have been restored are pushed out of the furnace by the rotation of the water-cooled screw discharger, and then enter the cylindrical cooler for N treatm...

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Problems solved by technology

[0004] 1) The water-cooled spiral blades are in pressure contact with high-temperature pellets for a long time, and the blades are easy to burn (wear) at high temperature, or even fall off, which seriously affects the discharge efficiency and is forced to be overhauled, resulting in a decrease in the operating rate of the rotary hearth furnace;

[0005] 2) As the fresh metallized pellets are squeezed by the thrust of the water-cooled helical blade, the pellets are easily deformed to form bonds, and the insufficient high-temperature strength causes the pellets to break up or even pulverize, resulting in an increase in the pulverization rate of the pellets and a reduction in the pellet yield. Yield

[0006] In the existing patent application, as disclosed in the publication number CN 206469687U, a method and device for absorbing metallized pellets from the furnace to be transported to the outside of the furnace by using a slide rail and a suction cup structure are disclosed, but its disadvantages mainly include: 1) After the suction cup absorbs the pellets in the rotary hearth furnace, it must be moved out of the furnace through the slide rail. After the pellets are emptied, it will return to the furnace for secondary suction. However, the bottom of the rotary hearth furnace is continuously rotating and it is impossible to stop A period of time is used to complete this periodic discharge. This discharge method will inevitably cause the pellets in the furnace to leak out, causing the feed to pile up and disrupt the production rhythm; 2) One end of the guide rail needs to be fixed in the furnace and the other end on Outside the furnace, while the rotary hearth furnace is operated at high temperature, the stressed guide rails cannot guarantee that it will not deform or collapse for a long time

[0007] For example, the publication number CN 01253993 discloses a discharge device that uses vacuum suction to suck the pellets out of the furnace. In fact, it is difficult to realize: because there is a large amount of furnace gas in the rotary hearth furnace, the vacuum suction cup starts to close the pellets. When sucking material, most of the gas entering the material guide pipe will be furnace gas instead of pellets, which will destroy the furnace gas flow and reducing atmosphere in the rotary hearth furnace, resulting in a great impact on the reduction rate of pellets

[0008] For example, the publication number CN 102837932 discloses a method and device for scraping pellets out of the furnace using a high-temperature-resistant scraping hopper driven by a high-temperature-resistant chain plate. However, it is essentially the same as a screw discharger and belongs to mechanical discharge. There is also the problem of deterioration and failure of service materials in high temperature resistant hoppers under long-term high temperature conditions

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