Rotary hearth furnace

Abstract

The invention discloses a rotary hearth furnace, which includes a furnace body, and at least one material layer stirring device fixedly arranged inside the furnace body and positioned above a rotating platform, wherein the rotating platform and a driving mechanism for driving the rotating platform to rotate are arranged inside the furnace body; a support device used for supporting the rotating platform is arranged under the rotating platform; the material layer stirring device includes at least one row of stirring rake teeth extending towards the rotating platform and used for stirring material layers placed on the rotating platform. According to the rotary hearth furnace provided by the invention, the material layer stirring device is arranged inside the furnace body, and the stirring rake teeth for stirring the material layers placed on the rotating platform are arranged on the material layer stirring device, so that during the operation of the rotary hearth furnace, the material layers are stirred by the stirring rake teeth to reserve new clearance among the material layers, as a result, radiating heat can be transferred to the lower material layer through the clearance, the lower material layer can be heated more completely and more uniformly, that is, the heat transfer efficiency for the radiating heat is improved, the thickness of the material layers can be increased, and the production efficiency of the rotary hearth furnace can be improved.

Description

technical field [0001] The invention relates to a rotary hearth furnace, in particular to a rotary hearth furnace capable of increasing the heat transfer efficiency of a material layer and making the material layer evenly heated. Background technique [0002] The rotary hearth furnace direct reduction process has the advantages of simple equipment, short production cycle and fast reaction speed, especially in the treatment of zinc-containing dust in iron and steel plants, which has great economic and social benefits. Therefore, the rotary hearth furnace process has been popular all over the world since its birth It has been widely promoted and become one of the mainstream processes of coal-based direct reduction process. [0003] The process of producing direct reduced iron by rotary hearth furnace process is as follows: evenly mix iron ore powder or zinc-containing dust with reducing agent (mainly coal powder) and then make pellets or briquettes, and dry carbon-containing p...

AI Technical Summary

Problems solved by technology

[0004] Since the rotary hearth furnace adopts the heating method of radiation heat transfer to reduce the iron oxides in the pellets / briquettes or briquettes by the carbon and volatile reducing gas in them, the high temperature heat of the burner combustion in the rotary hearth furnace depends on the flame Radiation heat transfer, because the material layer is still, the heat of the burning flame can only reach the surface of the material layer, and part of the heat can only reach the place 1~2 layers away from the surface through the gap of the material layer, so that the thickness of the material layer can only be 30 ~50mm, if the thickness of the material layer increases, the metallization rate and strength of the lower layer of pellets / briquettes are low, so the production efficiency of the rotary hearth furnace process is low

[0005] In view of this, in order to solve the defect that the material layer receives radiation and heat transfer unevenly due to the static material layer in the rotary hearth furnace, the present invention aims to explore a rotary hearth furnace that can increase the heat transfer of the material layer in the rotary hearth furnace Uniformity and heat transfer efficiency, and increased productivity of rotary hearth furnaces

Images