急冷处理对CFB锅炉底渣脱硫特性的影响

doi:10.11949/j.issn.0438-1157.20160227

化工学报 ›› 2016, Vol. 67 ›› Issue (9): 3583-3589.DOI: 10.11949/j.issn.0438-1157.20160227

急冷处理对CFB锅炉底渣脱硫特性的影响

李昊, 陈午凤, 王长安, 车得福

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

收稿日期:2016-03-01 修回日期:2016-05-30 出版日期:2016-09-05 发布日期:2016-09-05
通讯作者: 车得福
基金资助:
国家自然科学基金项目（51506163）；中央高校基本科研业务费专项资金项目（xjj2014041）。

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

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

State Key Laboratory of Multiphase Flow in Power Engineering, Xi'an Jiaotong University, Xi'an 710049, Shaanxi, China

Received:2016-03-01 Revised:2016-05-30 Online:2016-09-05 Published:2016-09-05
Supported by:
supported by the National Natural Science Foundation of China (51506163) and the Fundamental Research Funds for the Central Universities (xjj2014041).

摘要/Abstract

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。

关键词: 循环流化床, 底渣, 废物处理, 再生, 脱硫, 急冷

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.

Key words: circulating fluidized bed, bottom ash, waste treatment, regeneration, desulfurization, rapid water-cooling

中图分类号:

X773

李昊, 陈午凤, 王长安, 车得福. 急冷处理对CFB锅炉底渣脱硫特性的影响[J]. 化工学报, 2016, 67(9): 3583-3589.

LI Hao, CHEN Wufeng, WANG Chang'an, CHE Defu. Effect of rapid water-cooling process on desulfurization performance of CFB bottom ash[J]. CIESC Journal, 2016, 67(9): 3583-3589.

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急冷处理对CFB锅炉底渣脱硫特性的影响

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

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