Thermal decomposition kinetic and simulation of peanut shell

摘要

Today, great importance was attached to harness of plant tissue because of resource and energy cris is .This paper discusses thermal decomposition of peanut shell with NETZSCH-STA409PC thermal analysis.; prepares for exploitation of peanut shell. Peanut shell thermal decomposition was composed of 3 steps TG loss ,the first step TG loss was 6% dehydration and occurred at 80-100°C; the second step TG loss was 54% and occurred at 320-380°C ,this step was the mainly peanut shell thermal decomposition; the third step TG loss was 16% and occurred at 380-700°C, it was the thermal decomposition of residual ; Effects of temperature rising rate, grain size and purge-gas flow rate on peanut shell decomposition character were studied. Kinetic function was obtained and kinetic parameters were calculated with Linear regression provided by NETZSCH Instruments Co.Ltd.The correlation coefficient is 0.9967. The results show that peanut shell decomposition is a 3-dim.diffusion Janders type reaction(D3) The reaction activation energy E=141.67kJ/mol, IgA=8.6454. The D3 kinetic function predicts that peanut shell decomposition is 100% at 360°C for 12 minutes and 58% at 300°C for 25minutes, and the process of gasify or thermal decomposition can be optimized.