Lining structure of rotary kiln

Abstract

The invention discloses a lining structure of a rotary kiln. The lining of the rotary kiln comprises a rear kiln mouth, a preheating zone, a decomposing zone, an upper side transitional zone, a firing zone, a lower side transitional zone and a front kiln mouth, wherein the rear kiln mouth is formed by compounding corundum hollow sphere light castable with mullite amorphous castable; the preheating zone is made of an alkali-resistant composite brick or a clay composite brick or a high-aluminum composite brick or alkali-resistant castable; the decomposing zone is made of a clay composite brick or a high-aluminum composite brick or a silicon mullite composite brick; the upper side transitional zone is made of a periclase spinel composite brick or a silicon mullite composite brick or a magnesium composite brick; the firing zone is made of a magnesium chromium composite brick or a periclase spinel composite brick or a magnesium calcium zirconium composite brick or a magnesium iron aluminum composite brick; the lower side transitional zone is made of a silicon mullite composite brick or a spinel composite brick or a magnesium composite brick; and the front kiln mouth is formed by compounding corundum hollow sphere light castable with steel fiber reinforced mullite amorphous castable. The lining is made of a heavy / light composite fireproof material with an energy-saving function, the rotary kiln is subjected to segmented construction according to the requirement, and the firing zone is made of a heavy / light composite brick particularly, so that the barrel wall temperature is greatly reduced, the service life of the rotary kiln is prolonged, and energy saving and consumption reducing effects are achieved.

Description

technical field [0001] The invention relates to a rotary kiln, in particular to a rotary kiln lining structure. Background technique [0002] Rotary kilns are widely used in cement, metallurgy, refractory materials, chemical and other industrial sectors. The energy consumption of rotary kilns is an important indicator of working costs. The thermal efficiency of ordinary cement rotary kiln is about 30%, and the more advanced suspension preheater kiln is only about 50%, so there is a lot of potential for energy saving and consumption reduction. [0003] The heat loss of the cement rotary kiln is mainly manifested in the heat loss of clinker cooling, the heat radiation of the rotary kiln shell, the heat loss of incomplete combustion, the heat loss of evaporated water, the heat loss of kiln dust, and the heat loss of waste gas. etc. Among them, the heat radiation loss of the rotary kiln shell is 12-17%, so doing a good job of thermal protection technology for the kiln body is v...

AI Technical Summary

Problems solved by technology

[0007] In order to overcome the problem of high thermal conductivity of refractory materials existing in single-material structural bricks for rotary kilns, and the existing composite bricks that combine heavy and light weights have the disadvantages of low structural strength and fragility in light parts. Composite masonry has the disadvantage of easy separation and falling off, and the use of heavy / heavy structure composite bricks with different thermal conductivity still has the problem of large thermal conductivity. The purpose of the present invention is to provide a rotary kiln lining structure, which uses composite bricks to The kiln body masonry overcomes the various problems existing in the above-mentioned original lining structure, and finally achieves the purpose of reducing the overall refractory consumption, prolonging the service life, reducing the difficulty of masonry and saving energy consumption

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