Lime roasting shaft kiln

Abstract

The invention discloses a lime roasting shaft kiln, comprising an internal combustion fuel-free combustion chamber, fuel-air mixing jets, a fuel-air mixture inlet, a combustion chamber temperature control system, a kiln interior uniform air blasting device and a central smoke discharge device, wherein fuel-air mixtures are jetted into the internal combustion fuel-free combustion chamber through the jets arranged around the kiln, the fuel-air mixtures enter into the kiln through the fuel-air mixture inlet, high-temperature high-pressure gas, resulting from collision and combustion of two fuel-air mixtures which are jetted into the internal combustion fuel-free combustion chamber oppositely, is jetted out from the bottom of the combustion chamber and then uniformly enters materials to roastthe materials, and the temperature of the combustion chamber is controlled by a combustion chamber temperature control system, and air is uniformly distributed on the section of the kiln through the kiln interior even uniform air blasting device to realize uniform material cooling and air preheating. The kiln of the invention has a simple structure and operation, low investment, wide suitability of raw fuel, low thermal consumption and high product quality.

Description

technical field [0001] The invention relates to a kiln used in the lime industry, in particular to a lime roasting (vertical) kiln, which is mainly used for roasting metallurgical lime, chemical calcium carbide lime, construction lime and lightly burned magnesia, etc. The raw material for roasting is limestone And magnesite, the products it produces are active lime and active magnesia, which are important raw materials for metallurgical industry, chemical industry and construction industry. Background technique [0002] At present, the shaft kilns used for roasting lime at home and abroad include the Swiss double-chamber shaft kiln, the German sleeve kiln, and the Italian oil-cooled beam kiln. Mouth gas fired shaft kiln, etc. [0003] The double-chamber shaft kiln is a lime roasting shaft kiln developed by the Austrians Smit and Hoffer in 1957, so the kiln is also called the Smit-Hoffer kiln. The double-chamber shaft kiln is currently the most advanced lime kiln in the worl...

AI Technical Summary

Problems solved by technology

[0009] The present invention aims to solve the shortcomings of foreign advanced lime shaft kilns such as complex structure, difficult operation and high investment, and at the same time solve the shortcomings of domestically produced lime shaft kilns such as low product quality, high heat consumption, and low fuel adaptability.

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