Effect of rapid water-cooling process on desulfurization performance of CFB bottom ash

LI Hao; CHEN Wufeng; WANG Chang'an; CHE Defu

doi:10.11949/j.issn.0438-1157.20160227

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Effect of rapid water-cooling process on desulfurization performance of CFB bottom ash

更新时间：2025-12-10

- Effect of rapid water-cooling process on desulfurization performance of CFB bottom ash
- CIESC Journal Issue 9, Pages: 3583-3589(2016)
- 作者机构：
  
  西安交通大学动力工程多相流国家重点实验室,陕西,西安,710049
- 作者简介：
- 基金信息：
- DOI：10.11949/j.issn.0438-1157.20160227
  CLC： 773
- Online First：05 September 2016，
  
  Published：05 September 2016
- 稿件说明：
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LI Hao, CHEN Wufeng, WANG Chang'an, et al. Effect of rapid water-cooling process on desulfurization performance of CFB bottom ash[J]. CIESC Journal, 2016, (9): 3583-3589.
DOI：

LI Hao, CHEN Wufeng, WANG Chang'an, et al. Effect of rapid water-cooling process on desulfurization performance of CFB bottom ash[J]. CIESC Journal, 2016, (9): 3583-3589. DOI： 10.11949/j.issn.0438-1157.20160227.

摘要

针对循环流化床（CFB）锅炉底渣综合利用率低的问题提出将高温CFB底渣在水中进行急冷的处理方法，搭建CFB锅炉底渣急冷实验台和脱硫实验台，对急冷前后的底渣进行f-CaO含量分析、微观结构特性和脱硫特性研究，通过理论分析提出了急冷有利于破坏颗粒CaSO4外壳的理论，并通过实验进行了验证。利用扫描式电子显微镜/射线能谱仪（SEM/EDX）和热重分析仪对急冷前后的底渣进行分析，结果表明急冷后底渣颗粒表面钙含量明显升高，急冷后底渣的钙利用率提高了30%左右，底渣急冷前温度越高，底渣的脱硫效率越高，这说明急冷条件有利于提高CFB锅炉底渣的脱硫效率，为CFB锅炉底渣的再生利用提出了一种新的方法，对于实际的工程应用具有一定的指导意义。

Abstract

A rapid water-cooling process to desulfurize high temperature CFB bottom ash was designed for the improvement of poor ash utilization. Apparatus and methods for bench-scale rapid water-cooling and desulfurizing study were established and CFB ashes with and without treatment were characterized for f-CaO content

microscopic structure

and desulfurization efficiency. Through theoretical analysis

a hypothesis

that rapid water-cooling could facilitate destroying shell of CaSO4 particles

was proposed and validated experimentally. Results of SEM/EDX and TGA analyses on treated and non-treated ashes showed that calcium on particle surface increased evidently and the calcium recycling rate could increase about 30% post water-cooling treatment. The desulfurization efficiency enhanced continuously with increasing temperature of CFB bottom ash before rapid water-cooling. When hot CFB ash entered into water

ash particles could burst and destroy CaSO4 shell due to strong thermal stress across particle surface. Since higher temperature of CFB ash prior to water-cooling would result in stronger thermal stress

CaSO4 shell were destroyed more easily and desulfurization efficiency became higher. Thus

the rapid water-cooling process would be a new method for regeneration and reuse of CFB ash by improving desulfurization efficiency

which certainly provided practical guidance for engineering applications.

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