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

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

Active Publication Date: 2010-07-28
SOUTHEAST UNIV
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  • Summary
  • 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, chlorin

Method used

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

Examples

Experimental program
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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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PUM

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Abstract

The invention discloses a device and a method for removing harmful components from gas in a cement kiln by utilizing a cross-flow moving bed. The device and the method are implemented by the following steps: adsorption carrier particles (3) fall into an absorber of the cross-flow moving bed (5) from a hopper (1); the high temperature gas enters the absorber of the cross-flow moving bed (5) and the low temperature adsorption carrier particles (3) for cross-flow flowing, and the harmful components in the gas are condensed onto the adsorption carrier particles (3); a discharge valve (7) controls the discharge rate of the adsorption carrier particles (3); a cleaning device (9) completes washing and drying the adsorption carrier particles (3) and delivers the adsorption carrier particles (3) back to the hopper (1) to realize the recycling of the carrier particles; and a supply bin (10) completes supplying the adsorption carrier particles (3). The device and the method can effectively solve the problems of crusting and blocking caused by circulation and enrichment of the harmful components such as alkali, chlorine and sulfur, avoid the increase of energy consumption due to evacuation, and simultaneously can separate harmful substances from the gas for resource recycling.

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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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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