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Device and method for removing harmful components in cement kiln flue gas by using cross-flow moving bed

A harmful component and cement kiln technology, applied in the field of chlorine, alkali and sulfur removal devices in the cement clinker firing process, can solve problems such as crusting and blockage, achieve less drop in flue gas temperature, improve quality, and improve adaptive effect

Active Publication Date: 2012-02-22
SOUTHEAST UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Technical problem: The present invention aims at the problem of skinning and clogging caused by the cyclic enrichment of harmful components such as alkali, chlorine and sulfur in the cement production process, and proposes a device for removing harmful components in cement kiln flue gas by using a cross-flow moving bed and methods

Method used

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  • Device and method for removing harmful components in cement kiln flue gas by using cross-flow moving bed
  • Device and method for removing harmful components in cement kiln flue gas by using cross-flow moving bed

Examples

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Effect test

Embodiment 1

[0036] Example 1, harmful components such as alkali, chlorine, and sulfur contained in the kiln gas will condense at about 700 ° C, and then

[0037] Causing crust clogging. The exhaust gas temperature of the lowest stage cyclone separator is about 750°C, so the condensation of harmful components usually begins in the penultimate stage preheater. It is designed that the flue gas from the lowest cyclone separator passes through the cross-flow moving bed absorber, and flows cross-flow with the adsorption carrier in the cross-flow moving bed absorber. Alkali, chlorine, sulfur and other harmful components are condensed on the adsorption carrier when cold, and are discharged out of the absorption tower together with the adsorption carrier. In this way, the problem of crust blockage caused by the cyclic enrichment of harmful components such as alkali, chlorine, and sulfur is solved.

Embodiment 2

[0038] Example 2, for the preheating system that has been installed with bypass ventilation equipment, the exhaust gas can be passed through the cross-flow moving bed absorber first, and after the harmful components are removed, it can be directly sent to the raw meal preheater to heat the raw meal , recovering the heat in it, thereby reducing heat loss.

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Abstract

The present invention is a device and method for removing harmful components of cement kiln flue gas by using a cross-flow moving bed, which is carried out according to the following steps: adsorption carrier particles (3) fall into a cross-flow moving bed absorber from a hopper (1) (5); the high-temperature flue gas enters the cross-flow moving bed absorber (5) and the low-temperature adsorption carrier particles (3) to carry out cross-flow flow, and the harmful components in the flue gas condense on the adsorption carrier particles (3); the discharge valve ( 7) Control the discharge rate of the adsorption carrier (3); after the cleaning device (9) completes the washing and drying of the adsorption carrier (3), the adsorption carrier particles (3) are returned to the hopper (1) to realize the separation of the carrier particles Recycling. The replenishment of the adsorption carrier particles (3) is completed from the replenishment bin (10). The invention can effectively solve the problem of skin blockage caused by the cyclic enrichment of harmful components such as alkali, chlorine, sulfur, etc., avoid a large increase in energy consumption due to emptying, and can also separate harmful substances in the flue gas for further processing. Resource reuse.

Description

technical field [0001] The invention relates to a device and method for removing alkali, chlorine and sulfur in the burning process of cement clinker, belonging to the technical field of cement production. technical background [0002] The new dry process cement production with suspension preheating and pre-decomposition technology as the core is the mainstream process in the development of the cement industry at present. However, during the firing process of cement clinker, due to the re-condensation of harmful components such as alkali, chlorine and sulfur in the suspension preheater system, the content of harmful components such as alkali, chlorine and sulfur in raw meal and fuel is relatively high, which is very high. It is easy to cause sticking and blockage of the preheating system; at the same time, the alkali content in the clinker is often higher than other types of kilns, thus affecting the quality of the cement clinker. [0003] In the precalcining kiln system, t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/08B01D53/83
Inventor 金保升杜龙左武王晓佳顾吉青刘继驰
Owner SOUTHEAST UNIV
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