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

A technology of calcium carbide furnace tail gas and active lime, which is applied in the direction of lime production, etc., can solve the problems that the closed calcium carbide furnace tail gas cannot be comprehensively and effectively utilized, does not have chemical product sales channels, and cannot meet large-scale production, and achieves the reduction of unit electricity consumption. consumption, realize the comprehensive utilization of resources, and achieve the effect of saving energy and reducing consumption

Inactive Publication Date: 2013-04-24
CITIC HEAVY INDUSTRIES CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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.

Method used

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

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specific Embodiment approach

[0012] The specific implementation is that the closed calcium carbide furnace produces 74-85% CO and dust-containing high-temperature tail gas (550-800°C); the tail gas enters the tail gas cooling system through a closed pipeline and reduces to below 260°C after being cooled, and then passes through the low-temperature tail gas for dust removal The system is purified in the dust collector; the purified clean tail gas and coke powder (or coal powder) are sent to the burner of the rotary kiln firing system as fuel for the lime calcination equipment; the limestone passes through the kiln tail in the vertical preheater The hot gas is preheated to above 900°C and achieves pre-decomposition of more than 25%, and enters the firing system of the rotary kiln; the preheated limestone becomes active lime in the firing system of the rotary kiln after being calcined by tail gas and coke powder. After the lime is cooled by the vertical cooler, it is sent to the finished product warehouse thr...

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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...

Claims

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Application Information

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IPC IPC(8): C04B2/10
CPCY02P40/42Y02P40/40
Inventor 段玉震乔斌孟庆辉张凯博朱雯鲁俊张升奇华丽珠
Owner CITIC HEAVY INDUSTRIES CO LTD
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