Conversion of Industrially Processed Biomass Waste into Value-added Products Using High Temperature Agents

摘要

Biomass is renewable, widely distributed along the Earth resource which can be utilized for energy and chemicals generation, gradually replacing the significance of fossil fuels. In this work the conversion of an industrially processed biomass waste (straw pellets) has been studied by means of High Temperature Steam Gasification (HTSG) and High Temperature Pyrolysis (HTP). The aim of the work is to optimize the process for a specific application. The experiments have been carried out using a lab-scale, batch-type plug-flow reactor, at Royal Institute of Technology (KTH). The primary objectives are focused to estimate an influence of temperature and steam-to-fuel ratio (S/F) on the fuel-to-gas conversion as well as composition, yields and heating value of generated gas. The sample temperature, mass loss, gas composition, LHV and gas yield of producer gas vs. residence time are reported for three different agent temperatures in the range 700-950°C and three different levels of S/F including 0 which corresponds to HTP. The gas yield was 2-3 Nm~3/kg and the LHV ranged between 8-13MJ/Nm~3. The results show increasing reaction rate, hydrogen yield and reduction of tar with increasing agent temperature and S/F. At S/F=3.2 the reduction of CO and hydrocarbons is observed even at 850°C yielding amount of hydrogen by 100% up to 38% compared with S/F =1.875.