化工学报2017，Vol.68Issue(5)：2148-2154,7.DOI:10.11949/j.issn.0438-1157.20161657
Shell炉合成气冷却器分层积灰特性
Characteristics of layered ash deposition in Shell coal gasification syngas cooler
摘要
Abstract
Serious ash deposition and fouling from the synthetic gas cooler in Shell gasifier was studied. The physicochemical characteristics of samples were investigated by X-Ray Fluorescence Spectrometer (XRF), X-Ray Diffraction (XRD), Scanning Electron Microscopy and Energy Dispersive Spectrometer (SEM-EDS) respectively to explore the mechanisms of ash accumulation problem. The results showed that the deposition had an obvious layered structure. The inner layer, which presented red color, had the highest degree of crystallization and stiff structure. Its dominant mineral components were calcium sulfate, iron oxide and ferrous sulfide. The middle layer presented yellow color. The amount of Fe and S, the crystallinity and hardness all decreased. The outer layer, which presented grey color and had the lowest amount of Fe and S, was amorphous, soft and porous. The differences of color, hardness and mineral components among three ash layers are due to different interaction of adhesion and sintering as the deposition surface temperature increases with the growth of ash thickness. Ash composition, temperature, reaction atmosphere and pressure are all important factors. And the selective deposition and accumulation of iron-bearing minerals with low melting point in heat transfer surfaces are important sources of initial layer.关键词
气化/合成气冷却器/结垢/分层结构/烧结/初始灰层Key words
gasification/syngas cooler/fouling/layered structure/sintering/initial layer分类
化学化工引用本文复制引用
韩瑞午,谭厚章,魏博,王毅斌,张朋..Shell炉合成气冷却器分层积灰特性[J].化工学报,2017,68(5):2148-2154,7.基金项目
国家自然科学基金项目(51376147)supported by the National Natural Science Foundation of China (51376147). （51376147）
