Method for calcining active lime by taking tail gas from sealing type calcium carbide furnace as fuel for rotary kiln

Abstract

A method for calcining active lime by taking tail gas from a sealing type calcium carbide furnace as fuel for a rotary kiln comprises the following steps: dust-containing high-temperature tail gas from the sealing type calcium carbide furnace which also produces CO enters a tail gas cooling system to be cooled and reduced therein after passing through a closed pipeline, and then is purified in a dust remover through a low temperature tail gas dust removing system; the purified tail gas and coke powder or coal dust are sent to a combustor of a rotary kiln calcination system to be taken as fuelfor lime calcination equipment; limestone enters the rotary kiln calcination system after being preheated by kiln tail hot gas in a vertical preheater and realizing predecomposition; after being calcined by tail gas and coke powder, the preheated limestone appears in the rotary kiln calcination system as active lime which after being cooled by a vertical cooler is sent by transportation equipmentto a finished products storage; air involved in the cooling enters the rotary kiln as primary air which is burnt therein, and the involvement of preheated air in the combustion compensates for the problem that tail gas from the sealing type calcium carbide furnace has a low thermal value; flue gas for preheating the limestone can be emitted at a low temperature and without dust after being subjected to dust removal by a bag type dust remover; and active lime produced by using the method is taken as the raw material for manufacturing calcium carbide.

Description

Technical field: [0001] The invention relates to a method for calcining active lime with purified tail gas as fuel, in particular to a method for calcining active lime with tail gas of a closed calcium carbide furnace as fuel for a rotary kiln. Background technique: [0002] At present, the rotary kiln system with vertical preheater is a complete set of high-efficiency and energy-saving high-activity lime production technology. The high-activity lime produced is widely used in steelmaking, papermaking, metal magnesium and other industries. Including vertical preheater, rotary kiln, vertical cooling and other main equipment. [0003] The production of calcium carbide is based on active lime and coke as raw materials, and the chemical raw material - calcium carbide is generated by electrification under closed conditions, and the by-product CO is generated, that is, the exhaust gas of the closed calcium carbide furnace. The tail gas of the closed calcium carbide furnace contai...

AI Technical Summary

Problems solved by technology

However, burning the tail gas outside the furnace causes a lot of waste of energy and resources; the tail gas is used to make chemical products, and the production process is relatively complicated, and the amount of tail gas in a general calcium carbide factory cannot meet large-scale production, so most calcium carbide manufacturers do not have Conditions for building other chemical plants and sales channels for chemical products

Therefore, the tail gas of the closed calcium carbide furnace cannot be comprehensively and effectively utilized at present.

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