Research progress of the influence of alkali metal migration and transformation on biomass ash fouling and slagging
The thermal conversion and utilization process of biomass produces a large amount of biomass ash,in which the contents of alkali metal elements such as potassium and sodium are high,resulting in low melting temperature,easy to melt or volatilize at high temperatures,causing fouling,slagging,corrosion and other hazards to boiler,pipeline or equipment heating surface.To systematically understand the research results of the influence of the migration and transformation of alkali metal on the fouling and slagging behaviors of biomass ash and predict its development trend,this paper first summarized the safety problems and hazards caused by alkali metal migration and transformation in biomass thermal transformation process.Secondly,the research progress on the fouling and slagging mechanism of biomass ash at home and abroad in recent years was reviewed,including the evolution law of fouling and slagging behaviors of biomass ash from different thermal conversion sources,alkali metal migration and transformation characteristics,ash melting and sintering law,etc.Finally,the development trend of biomass ash fouling and slagging control in the future was prospected.The results indicate that the occurrence form and evolution characteristics of alkali metals are important factors affecting the characteristics of ash melting and slagging,and the melting and sintering law of biomass ash from different thermal conversion sources is the key to the prevention and control of ash slagging.Most previous studies of alkali metal migration characteristics only focused on biomass fuel properties,mineral composition,etc.The influence of alkali metal migration on biomass ash fouling and melting as well as the influence of different forms of alkaline compounds during the thermal conversion process is still insufficiently thorough and systematic,and a perfect theory system has not been formed,which will become the focus of future research.
safety engineeringbiomass energythermo-chemical conversionalkali metalash fouling and slagging
NETL
NSTL
万方数据
维普
