Experimental Study on High Temperature Pyrolysis Characteristics of Biomass Tar in Biomass Gasification-reburning Technology

Abstract

Abstract In order to solve the problem of high-tar content of gasification products in biomass gasification-reburning technology, this thesis proposes an experimental scheme for high temperature thermal cracking of biomass tar, using representative rice hull tar as a sample, and self-designed pyrolysis experiment. On the stage, the reaction temperature of the gasification chamber was measured by a high-temperature thermocouple. At the same time, the biomass tar cracking rate was measured at different temperatures with the thermobalance by appropriately changing pyrolysis temperature, and the Agilent HP5973 GC/MS was employed to analyze the components of pyrolysis products of biomass tar under different temperature conditions. The experimental results show that the total thermal cracking rate of tar increased with the increasing of experimental temperature. In the temperature range of 550°C∼655°C, the increasing rate of thermal cracking becomed slower; when it reached between 655°C and 790°C, the thermal-cracking rate showed a significant growth trend; while entering 790°C∼853°C, the growth rate slowed down. The experimental and analytical results reveal the basic laws of high-temperature pyrolysis of biomass tar, and provide a certain technical basis for the industrial production of low-tar and high-quality biomass gas.