Furnace profile structure of rotary hearth furnace

Abstract

A furnace profile structure of a rotary hearth furnace comprises an annular cavity, the annular cavity sequentially comprises a material inlet and outlet area, a first preheating area, a second reduction area, a flue area, a third reduction area and a fourth reduction area according to the flow direction of dust mud. The flow direction of flue gas generated in the first preheating area is the same as that of the dust mud, the flow direction of flue gas generated in the second reduction area is the same as that of the dust mud, a flue gas outlet of the flue area is laterally horizontal, the flow direction of flue gas generated in the third reduction area is opposite to that of the dust mud, and the flow direction of flue gas generated in the fourth reduction area is opposite to that of the dust mud. The annular cavity is nonuniform in height, and the portion, where the first preheating area, the second reduction area and the flue area are located, of the annular cavity is higher than the portion, where the material inlet and outlet area, the third reduction area and the fourth reduction area are located, of the annular cavity.

Description

technical field [0001] The invention relates to the field of iron and steel manufacturing equipment, in particular to a furnace type structure of a rotary hearth furnace. [0002] Background technique [0003] Every time a steel company produces 1 ton of steel, it will produce about 100kg of dust sludge, and about 30% of the dust sludge contains harmful elements such as zinc, potassium, and sodium. By adopting the direct reduction technology of the rotary hearth furnace, the above-mentioned harmful elements can be effectively recovered and utilized, so it has been highly valued by domestic and foreign iron and steel enterprises. [0004] Judging from the operation of rotary hearth furnaces at home and abroad, the biggest problem is the clogging of waste heat boilers and heat exchangers. The production process of the rotary hearth furnace produces a large amount of smoke and dust. A rotary hearth furnace that handles 200,000 tons of dust and sludge from iron and steel enter...

AI Technical Summary

Problems solved by technology

Therefore, a large flue gas flow rate is bound to take away more dust and mud particles on the surface of the pellets, increasing the probability of subsequent blockage of the waste heat boiler and heat exchanger

[0005] The existing rotary hearth furnaces at home and abroad are all ring-shaped chambers with equal heights. The feed and discharge maintain an included angle of about 15°. The material flow and the flue gas flow move in reverse, making full use of the sensible heat of the flue gas, but at the same time the flue gas travel distance increases, the flow rate increases, and the solid dust carried away in the flue gas increases; in addition, the high temperature and rapid heat cause the dust to burst and increase the dust The quantity affects the heat exchange efficiency of subsequent waste heat boilers and heat exchangers

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