Research Status and Prospect of Extending Service Life on Screw of Biomass Briquetting Machine

Biomass curing technology is an important development direction for biomass energy conversion and utilization.Screw extrusion technology is the earliest developed and most widely used production technology of biomass briquetting.Screw is the core of its forming work parts.Screw cause high speed dry friction with biomass materials under high temperature and high pressure，which create serious wear，shorten service life and severely restrict efficiency of screw extruder.A lot of research has been done in order to extend service life of screw in biomass briquetting machine by domestic and overseas scholars.Combining with working principles and failure modes for screw of biomass briquetting machine，research works in prolonging service life of the screw at home and abroad were summarized and overviewed，such as forming process，shape and structure designing，material selecting of screw and surface strengthening technology applying.Research status were summarized and focus of future research directions were proposed.