Device and method for inner and outer ring alternating type heating of high-temperature uniform calcination of shaft kiln

Abstract

The invention provides a device and a method for inner and outer ring alternating type heating of high-temperature uniform calcination of a shaft kiln, and belongs to the technical field of metallurgy. The device is of a sleeve structure, and coal gas and combustion-supporting air are designed to be respectively provided with an inner-ring channel and an outer-ring channel, namely an outer-ring coal gas channel, an outer-ring air channel, an inner-ring coal gas channel and an inner-ring air channel. The coal gas and air enter the outer-ring coal gas channel and the outer-ring air channel through the outer-ring coal gas inlet and the outer-ring air inlet respectively or enter the inner-ring coal gas channel and the inner-ring air channel through the inner-ring coal gas inlet and the inner-ring air inlet respectively. Outer-ring burners and inner-ring burners are respectively arranged in the outer-ring channels and the inner-ring channels. A material calcining area is arranged between each inner-ring channel and the corresponding outer-ring channel. The device has the advantages of realization of uniform heating of materials, ingenious design, simplicity and high operability, is suitable for high-temperature calcining processes of various shaft kilns, solves the problems of overburning, underburning and the like of the materials caused by uneven heating temperature in the shaft kiln, and can remarkably improve the quality of calcined products.

Description

technical field [0001] The invention relates to the technical field of metallurgy, in particular to an inner and outer ring alternating heating device and method for high-temperature uniform calcination in a shaft kiln. Background technique [0002] Shaft kiln is a typical raw material high-temperature calcination equipment in the fields of metallurgy and building materials, such as pellet calcination shaft kiln, lime calcination shaft kiln, etc. Compared with the rotary kiln, the vertical kiln has attracted extensive attention due to its advantages of small footprint, low energy consumption, high thermal efficiency, and less pollution, and is considered to be the most promising calcination technology. [0003] The fuel is usually burned directly in the shaft kiln to provide heat for the high temperature calcination process. The burners are arranged on the side wall of the shaft kiln and located in the middle and lower part of the shaft kiln. The high-temperature flue gas ...

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Problems solved by technology

[0005] The invention aims at the problems of poor temperature uniformity and easy over-burning / under-burning of materials during the high-temperature calcination process of the vertical kiln, and provides an inner and outer ring alternating heating device and method for high-temperature uniform calcination of the vertical kiln

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