煤炭转化2025，Vol.48Issue(6)：90-101,12.DOI:10.19726/j.cnki.ebcc.202506008
煤与生物质共气化过程中工艺参数和焦结构对碱金属实时释放特性的影响规律
Influence laws of process parameters and coke structure on real-time release characteristics of alkali metals during co-gasification of coal and biomass
摘要
Abstract
This article investigates the influence of alkali metal release during the high tem-perature co-gasification of coal and biomass,and provides a solid theoretical basis for solving the prob-lems of corrosion,ash accumulation,and scaling caused by the high-temperature release of alkali metals in industrial gasification equipment.In this article,Yangchangwan coal(YCWC)and rice straw(RS)were used as raw materials to in-situ investigate the effects of process parameters on the real-time release characteristics of alkali metals by utilizing an independently constructed visual fixed-bed and laser-induced breakdown spectrometer(VFB-LIBS)coupling system,such as gasification temperatures(900℃,1 000℃,1 100℃),CO2 flow rates,and raw material mixing ratios(YCWC∶RS).Combined with multiple characterization instruments,the effect of the gasified char structure on the release of alkali metals was also investigated.The results show that the gasification temperature,feed-stock mixing ratio and atmosphere are the key factors affecting the release of alkali metals K and Na.The higher the gasification temperature,the greater the maximum release concentration,release rate and release ratio of potassium and sodium.When the co-gasification temperature of Y1R1(50%YCWC and 50%RS)increases from 900℃to 1 100℃,the maximum release concentration of K increases from 59.7 mg/m3 to 107.9 mg/m3.In the process of co-gasification,YCWC has an inhibi-tory effect on the real-time release of K.At a gasification temperature of 900℃,the real-time release peaks of K and Na are observed during the co-gasification of Y1R3(25%YCWC and 75%RS)and gasification of RS alone,appearing at approximately 50 s,156 s,and 1 260 s.For all coal-biomass mixing ratios at 1 000℃and 1 100℃,the real-time release peaks of K and Na occurs only around 50 s and 156 s.In the co-gasification process,the higher the CO2 concentration in the N2-CO2 mixed atmo-sphere,the lower the maximum release concentration of alkali metals and the release rate of alkali metals.A CO2-only atmosphere promotes the maximum release concentrations of K and Na in the pyrolysis stage but inhibits their release during the gasification stage.Alkali metals can react with Si and Al minerals and C—O—C bonds in coal during co-gasification of coal and biomass,which in turn inhibits the release of alkali metals.关键词
煤与生物质共气化/焦结构/碱金属/实时释放特性/LIBS/工艺参数Key words
co-gasification of coal and biomass/coke structure/alkali metals/real-time release characteristics/LIBS/process parameters分类
化学工程引用本文复制引用
王昌,王焦飞,白永辉,宋旭东,苏暐光,吕鹏,于广锁..煤与生物质共气化过程中工艺参数和焦结构对碱金属实时释放特性的影响规律[J].煤炭转化,2025,48(6):90-101,12.基金项目
国家自然科学基金项目(22008126)、宁夏重点研发项目(引才专项)(2021BEB04005)和宁夏自然科学基金项目(2023AAC03057). （22008126）
