摘要
生物质气化是一种环保、高效和可持续利用生物质能的技术。气化过程中生物质渣对气化炉耐火衬里侵蚀严重,但其机理仍亟待研究。在气化条件下进行了座滴实验,研究了富钾生物质渣在SiC-MgAl_(2)O_(4)和SiC-Si_(3)N_(4)耐火材料上的润湿、铺展和渗透行为;对反应样品进行切片,通过扫描电子显微镜-能量色散X射线光谱分析仪(SEM-EDS)对样品进行了侵蚀分析和化学成分分析;使用FactSage软件模拟耐火材料与富钾生物质渣的相互作用;基于实验和热化学模拟计算结果共同揭示了富钾生物质渣对耐火材料的渗透和侵蚀过程机理。结果表明:耐火材料SiC-Si_(3)N_(4)比SiC-MgAl_(2)O_(4)具有更好的抗渣性,熔渣在两种耐火材料上的最终润湿角分别为37.5°和4°;通过SEM-EDS扫描样品,发现K元素对MgAl_(2)O_(4)的渗透能力较强,SiC-MgAl_(2)O_(4)中的SiC表面被氧化,少量MgAl_(2)O_(4)被富钾渣溶解;SiC-Si_(3)N_(4)中的Si_(3)N_(4)基质受到较严重的氧化,生成的鳞石英溶解到熔渣,增加了熔渣的黏度,降低了熔渣的渗透能力。
Biomass gasification is an environmentally friendly,efficient and sustainable technology for utilizing biomass energy.However,the biomass slag generated during the gasification process severely erodes the refractory lining in gasifiers,and its underlying mechanisms require urgent investigation.Sessile-drop experiments were conducted under gasification conditions to examine the wetting,spreading and penetration behaviors of potassium-rich biomass slag on refractories composed of SiC-MgAl_(2)O_(4)and SiC-Si_(3)N_(4).The sample sections were analyzed for erosion behavior and chemical composition using scanning electron microscopy-energy dispersive spectrometer(SEM-EDS).Additionally,the interaction between the refractories and potassium-rich biomass slag was simulated using FactSage software.The combined results of experimental and thermochemical simulation results reveal the mechanisms underlying the penetration and erosion processes of potassium-rich biomass slag on refractories.The findings indicate that SiC-Si_(3)N_(4)refractory exhibits better slag resistance than SiC-MgAl_(2)O_(4),with the final wetting angles of slag on these two refractories being 37.5°and 4°,respectively.SEM-EDS analysis reveals that potassium(K)demonstrates a stronger penetration ability in MgAl_(2)O_(4),leading to the oxidation of SiC in SiC-MgAl_(2)O_(4)and the dissolution of small amounts of MgAl_(2)O_(4)by the potassium-rich slag.In contrast,the Si_(3)N_(4)matrix in SiC-Si_(3)N_(4)undergoes more significant oxidation,and the generated cristobalite is dissolved into the slag,increasing its viscosity and reducing the penetration ability of the slag.
作者
陈健
郭庆华
高靖红
龚岩
宋旭东
王兴军
于广锁
CHEN Jian;GUO Qinghua;GAO Jinghong;GONG Yan;SONG Xudong;WANG Xingjun;YU Guangsuo(Institute of Clean Coal Technology,East China University of Science and Technology,200237 Shanghai,China;State Key Laboratory of High-efficiency Utilization of Coal and Green Chemical Engineering,Ningxia University,750021 Yinchuan,China)
出处
《煤炭转化》
北大核心
2026年第1期100-110,共11页
Coal Conversion
基金
国家重点研发计划项目(2022YFB4101500)
国家自然科学基金联合基金项目(U21A2059)
上海市“科技创新行动计划”启明星项目(21QA1402300)。
关键词
富钾生物质渣
生物质气化
耐火衬里
碱侵蚀
热化学模拟
potassium-rich biomass slag
biomass gasification
refractory lining
alkali ero-sion
thermochemical simulation
