文献类型：期刊文献

英文题名：Hydrothermal carbonization of sludge: Effect of steam release on products properties and wall sticking phenomenon

作者：Xiao, Yao[1];Ding, Lu[1,2];Leghari, Asma[1];Yu, Mengyan[1];Gao, Ming[1];Yang, Yu[3];Gao, Yunfei[1];Chen, Wei-Hsin[4,5,6];Chen, Xueli[1];Wang, Fuchen[1]

机构：[1]East China Univ Sci & Technol, Inst Clean Coal Technol, Shanghai 200237, Peoples R China;[2]Shanghai Inst Pollut Control & Ecol Secur, Shanghai 200092, Peoples R China;[3]Jiangsu Huineng Environm Technol Co Ltd, Taizhou, Peoples R China;[4]Natl Cheng Kung Univ, Dept Aeronaut & Astronaut, Tainan 701, Taiwan;[5]Tunghai Univ, Res Ctr Smart Sustainable Circular Econ, Taichung 407, Taiwan;[6]Natl Chin Yi Univ Technol, Dept Mech Engn, Taichung 411, Taiwan

年份：2023

卷号：339

外文期刊名：FUEL

收录：;EI(收录号：20230513492952);WOS:【SCI-EXPANDED(收录号:WOS:000960815100001)】；

基金：This work was supported by the project of the National Key Research and development (R & D) Program and International Science and Technology Innovation Project between Governments (2021YFE0108900) , Belt & Road Young Scientist Exchange Project Supported by Fund of Shanghai Science and Technology Committee (20230742400) , and Pujiang Talent Program Supported by Fund of Shanghai Science and Technology Committee (20PJ1402800) .

语种：英文

外文关键词：Hydrothermal carbonization; Steam-release process; Dewatering performance; Wall sticking phenomenon; Sticky wall sample

摘要：In order to understand hydrothermal carbonization (HTC) process more effectively, the effect of steam-release process at different temperatures (160, 180, 200, and 220 degrees C) on product properties and wall sticking phe-nomenon were studied. Experimental results indicated that the approximate equilibrium moisture content (AEMC) of hydrochar obtained with (SRHC) and without (HC) steam-release process were both negatively correlated with zeta potential (R = -0.96326 for HC and R = -0.95825 for SRHC). More importantly, the absolute value of the zeta potential of SRHC was lower than HC indicating steam-release process significantly improve dewatering performance of sludge after HTC treatment. The results of FE-SEM and N2 adsorp-tion-desorption experiments indicated steam-release process was favorable for the formation of porous hydro-char. The variation of surface functional groups showed that the intensity of all peaks in SRHC was significantly lower than HC, indicating steam-release process which significantly affects surface chemical properties of samples. As for liquid, TOC, TN and COD value of the condensate were lower than filtrate, indicating steam-release process which produces "cleaner" condensed liquid with less organic matter content. The wall sticking phenomenon in the steam-release process became more severe with increasing temperature and the amount of sticky wall sample (SWS) increased from 0.392 g at 160 degrees C to 2.131 g at 220 degrees C, which indicated that tem-perature was key factor affecting the sticking phenomenon on the inside wall of the reactor. The contact angle of SWS and SRHC decreased from 60.083 degrees and 77.283 degrees at 160 degrees C to 51.317 degrees and 67.967 degrees at 220 degrees C, and the polar free energy of SWS (12.52-14.00 mN/m) was significantly higher than that of SRHC (1.85-4.53 mN/m), indi-cating increasing hydrophobicity and reducing polar free energy of sample were key factors in improving sticking phenomenon.