Limekiln hot air circulation system

Abstract

The invention relates to a limekiln hot air circulation system. The system comprises a limekiln, a deduster and a chimney, a hot air circulation outlet is arranged between the deduster and the chimney, and the hot air circulation outlet is respectively connected with a combustion-supporting gas primary wind pipeline and a combustion-supporting gas secondary wind pipeline; a first gas mixer is arranged in the combustion-supporting gas primary wind pipeline, and the first gas mixer is provided with an oxygen input port connected with an oxygen supply device; and a second heat exchanger for reducing the temperature of flue gas is arranged in the combustion-supporting gas secondary wind pipeline, and an oxygen input port connected with the oxygen supply device is arranged in the second gas mixer. The high-temperature heat-carrying flue gas generated by the limekiln is partially recycled, the oxygen content in the combustion-supporting air is changed, and the temperature of the heat-carrying flue gas is used to achieve secondary utilization of carbon monoxide in the flue gas, so the heat utilization efficiency of the limekiln is increased, the fuel consumption is reduced, and the totalemission amount of the flue gas is reduced; and nitrogen oxides and sulfur dioxide participate in reactions in the cycle calcination process in order to realize low-discharge amount control.

Description

technical field [0001] The invention relates to waste gas treatment and thermal efficiency improvement technology of a lime kiln, in particular to a lime kiln hot air circulation system. Background technique [0002] Lime is calcium oxide (CaO), which is widely used in iron and steel industry, calcium carbide industry, alumina industry, refractory materials and other industries. It is one of the necessary production raw materials in related fields. For example, in the metallurgical industry, it costs About 70 kg of lime is required. The main raw material for making lime is limestone. The main component of limestone is calcium carbonate. The basic principle of burning lime is to use high temperature to decompose calcium carbonate in limestone into calcium oxide and carbon dioxide. [0003] The lime production process is mainly divided into preheating, calcination, cooling and ash unloading. The process method is: put limestone and solid fuel into the lime kiln, or put gaseou...

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Problems solved by technology

[0006] The purpose of the present invention is to provide a lime kiln hot air circulation system, which is used to solve the problems of environmental pollution caused by flue gas discharge in the existing lime production process and high unit consumption of lime production cost

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