Structural characterization of char during co-gasification from torrefied sludge and Yangchangwan bituminous coal

IF 6.9 1区 工程技术 Q2 ENERGY & FUELS
Xinsha Zhang, Yonghui Bai, Jie Qin, Shengli Shi, Jiazhong Liu, Shuaibing Wang, Minhui Zhao, Guiming Shi, Changbing Ye, Guangsuo Yu
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Abstract

Abstract The present study aims to investigate the physico-chemical structural evolution characteristics of char structure of CO 2 atmosphere torrefaction pretreated sludge with Yangchangwan bituminous coal (YC) during co-gasification. The co-gasification reactivity of torrefied sludge and YC was measured using a thermogravimetric analyzer. The co-gasification reactivity of torrefied sludge with YC was thoroughly explored in depth by in situ heating stage microscope coupled with traditional characterization means of char sample (Scanning electron microscope, nitrogen adsorption analyzer, laser Raman spectroscopy). The results show that the gasification reaction rate of sludge treated under CO 2 atmosphere and coal blended char was better than other char samples at 1100–1200 °C. The torrefied sludge under CO 2 atmosphere promoted its thermal decomposition to the maximum extent, so that it eventually was transformed into a large number of small broken particles. The specific surface area and I D1 /I G ratio of blended char of torrefied sludge under CO 2 atmosphere and YC were 1.70 and 1.07 times higher than that of YC, respectively. The in situ technique revealed that YC char with the addition of torrefied sludge undergo gasification by shrinking core modes and the presence of obvious ash melting flow phenomenon. It was more obvious than that of YC.

Abstract Image

焦化污泥与杨长湾烟煤共气化过程中炭的结构表征
摘要本研究旨在研究杨长湾烟煤(YC) CO 2气氛焙烧预处理污泥共气化过程中焦炭结构的物理化学演变特征。用热重分析仪测定了碳化污泥与YC的共气化反应性。采用原位加热阶段显微镜结合传统的炭样表征手段(扫描电镜、氮吸附分析仪、激光拉曼光谱),对碳化污泥与YC共气化反应性进行了深入研究。结果表明:在1100 ~ 1200℃范围内,CO 2气氛下处理的污泥和煤混炭的气化反应速率优于其他炭样;co2气氛下碳化污泥最大程度地促进了其热分解,最终转化为大量破碎的小颗粒。co2气氛下碳化污泥混炭的比表面积和I D1 /I G比分别比YC高1.70倍和1.07倍。原位技术研究表明,添加碳化污泥后的YC煤焦以缩芯模式气化,存在明显的灰熔流现象。这比YC更明显。
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来源期刊
CiteScore
11.40
自引率
8.40%
发文量
678
审稿时长
12 weeks
期刊介绍: The International Journal of Coal Science & Technology is a peer-reviewed open access journal that focuses on key topics of coal scientific research and mining development. It serves as a forum for scientists to present research findings and discuss challenging issues in the field. The journal covers a range of topics including coal geology, geochemistry, geophysics, mineralogy, and petrology. It also covers coal mining theory, technology, and engineering, as well as coal processing, utilization, and conversion. Additionally, the journal explores coal mining environment and reclamation, along with related aspects. The International Journal of Coal Science & Technology is published with China Coal Society, who also cover the publication costs. This means that authors do not need to pay an article-processing charge.
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