文献类型：期刊文献

英文题名：Conversion progress and temperature of particles during entrained-flow coal gasification enabled by in-situ high-resolution visualization

作者：Lu, Hantao[1];Guo, Qinghua[1];Gong, Yan[1];Wang, Yue[1];Ding, Lu[1];Yu, Guangsuo[1,2]

机构：[1]East China Univ Sci & Technol, Inst Clean Coal Technol, Shanghai 200237, Peoples R China;[2]Ningxia Univ, State Key Lab High Efficiency Utilizat Coal & Gree, Yinchuan 750021, Peoples R China

年份：2026

卷号：320

外文期刊名：CHEMICAL ENGINEERING SCIENCE

收录：;EI(收录号：20253519087828);WOS:【SCI-EXPANDED(收录号:WOS:001565017300006)】；

基金：This work has been supported by the National Natural Science Foundation of China (U21A20318) and National Key R&D Program of China (2022YFB4101504).

语种：英文

外文关键词：Entrained-flow gasifier; High-resolution visualization; Single coal particle conversion; Reaction stage; Time-scale characteristic

摘要：In this study, we developed an in-situ imaging system combining a high-resolution industrial camera and monochromatic pyrometry to capture the life-cycle thermal conversion sequence of single coal particles adhered to the refractory wall in a bench-scale opposed multi-burner (OMB) entrained-flow gasifier. Compared with previous small-scale or model-based studies, this work provides direct observation under realistic conditions, simultaneous quantification of morphology and surface temperature with millisecond resolution, and establishes four distinct particle conversion stages. The results indicate that the particle size is in a unimodal distribution, with 60 % of the particles being smaller than 400 mu m. The aspect ratios of over 80 % of the particles are between 1.25 and 1.50. Particles with larger aspect ratios or irregular shapes are predominantly observed during late char oxidation or melting-collapse. All particles display initial volumetric expansion of about 10-25 % driven by rapid volatile release, structural loosening, and internal gas evolution. Larger particles require longer conductive heat transfer times, which reduces overall heating rates and delays volatile release and ignition onset compared to smaller particles. During char oxidation, surface reaction morphology remains quasi-steady, and burnout time increases nearly proportionally with particle size. Surface temperature PDFs shift from broad high-temperature ranges to lower values as carbon content diminishes, with cooling rates around 4,000 K/s. By resolving the heating-ignition, early char oxidation, accelerated oxidation, and decay-melting stages, this study provides quantitative benchmark data supporting improved particle-wall interaction models and the development of cleaner, more efficient coal gasification technology.