文献类型：期刊文献

英文题名：In-situ atomization and flame characteristics of coal water slurry in an impinging entrained-flow gasifier

作者：Xue, Zhicun[1];Guo, Qinghua[1];Gong, Yan[1];Wang, Yifei[1];Yu, Guangsuo[1]

机构：[1]East China Univ Sci & Technol, Minist Educ, Key Lab Coal Gasificat & Energy Chem Engn, Shanghai 200237, Peoples R China

年份：2018

卷号：190

起止页码：248

外文期刊名：CHEMICAL ENGINEERING SCIENCE

收录：;EI(收录号：20182605359211);WOS:【SCI-EXPANDED(收录号:WOS:000440454300024)】；

基金：This work was supported by the National Natural Science Foundation of China (21676091), and the Fundamental Research Funds for the Central Universities (222201414030).

语种：英文

外文关键词：Entrained-flow gasifier; Coal water slurry; Atomization; Flame characteristics; Efficiency; Stability

摘要：Based on the bench-scale impinging entrained-flow gasifier with coal water slurry (CWS) as the feedstock and the development of advanced visualization techniques, the in-situ atomization and flame characteristics of CWS were investigated. A new imaging system was applied to capture the images around the burners in the operating condition. After image post-processing, the instantaneous flame, time-averaged flame and oscillation of the flame were discussed. With the statistical method, the droplet size distribution, oscillation of the droplet concentration and time-dependent droplet size were obtained to analyze the efficiency and stability of the atomization process. The instantaneous flame shows that the atomization and gasification process is turbulent. The time-average CWS flame shows that the atomization angle decreases with an increase in the ratio of elemental oxygen to elemental carbon (O/C ratio). The oscillation of the flame and the atomization process demonstrate that in-situ atomization is closely related to the CWS flame. The diameter and number of droplets after primary atomization decrease with the increase of the O/C ratio. The decreases in median diameter and unconsumed CWS rate demonstrate that the increase in O/C ratio improves the efficiency of the atomization process. The reduction in oscillation scopes of the droplet concentration and size demonstrates that the increase in O/C ratio improves the stability of the atomization process. In addition, the droplet concentration c in three different O/C conditions is 17.8 kg.m(-3), 5.9 kg.m(-3) and 1.6 kg.m(-3) which demonstrates that the CWS is the dilute phase in the OMB gasifier. (C) 2018 Elsevier Ltd. All rights reserved.