文献类型：期刊文献

英文题名：Effects of phosphorous-based additive on flow properties of high silicon-aluminum coal ash

作者：Wu, Hao[1];Wang, Jiajian[1];Liu, Xia[1];Cao, Xi[1];Guo, Qinghua[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：2022

卷号：328

外文期刊名：FUEL

收录：;EI(收录号：20222912385273);WOS:【SCI-EXPANDED(收录号:WOS:000860666500001)】；

基金：The authors gratefully acknowledge the financial support from Na-tional Natural Science Foundation of China (22108080) .

语种：英文

外文关键词：Ash fusion temperatures; Slag viscosity; High -silicon -aluminum coal; Gasification; Phosphorus

摘要：Co-gasification with coal is a promising way to dispose the sewage sludge with high phosphorus content, but the lack of data on the flow properties of phosphorus-containing ashes and slags under reducing atmosphere limits the gasification of this fuel. In this study, Ca3(PO4)2 was chosen as the phosphorus model compound of sewage sludge and was added into one high-silicon-aluminum coal (Huainan, HN). Ash fusion temperatures (AFTs) and viscosity-temperature properties of blends were measured and the mechanism of effects of phosphorus were explored based on the results of X-ray diffraction (XRD), thermodynamic software FactSage, Fourier transformation infrared spectroscopy (FTIR) and scanning electron microscope with energy dispersive spectrometer (SEM-EDS). To eliminate the interference of calcium, a phosphorus-free control group was set up with CaCO3 and the same tests were conducted. The experimental and modelling results showed that phosphorus had a significant fluxing effect on the fusion of coal ash by providing the initial liquid phase and changing the main minerals. The effects of phosphorus on slag viscosity were rather complex. At the temperature above 1530 degrees C, phosphorusbearing slags had slightly higher viscosity values than phosphorus-free slags due to the increased polymerization degree of the network structure. However, at the cooling process, phosphorus restricted the crystallization in the slag and decreased the viscosity values and the temperatures of critical viscosity (TCV). In this paper, a suitable addition ratio of Ca3(PO4)2 for the slagging gasification of HN coal was concluded.