Co-pelletization of torrefied wheat straw and peanut shells: The energy consumption and properties of pellets

Abstract

Abstract. In this study, complementary of torrefaction and pelletization for wheat straw was investigated. Torrefied wheat straw was produced in a fixed bed reactor, then compressed into a single die press to explore the optimal parameters of pelletizing after torrefaction. At torrefied temperature 548K for 30min, the influence of different moisture content, content of binder on the quality of pellets were evaluated in term of volume density, volume expansion ratio, compression energy consumption. It was shown that torrefaction improved the characteristics of material with hydrophobic, higher heating value. Furthermore co-pelletization of torrefied wheat straw and peanut shells for torrefied wheat straw can enhance volume density and compressive strength. The optimal conditions for compression energy consumption and the quality of pellets were torrefied at 10% moisture content. Add peanut shell powder helps to increase the strength of pellet, the volume density, lower energy consumption compression and volume expansion ratio.