EVOLUTION OF CHAR'S PHYSICAL AND CHEMICAL STRUCTURE DURING BIOMASS PYROLYSIS
The internal porosity characteristic of the pyrolysis char is one of the important parameters of the thermal decomposition mechanism and char properties. The different final pyrolysis temperatures of char for straw, rice husk and sawdust were used in a fixed bed reactor, with nitrogen atmosphere. The specific surface area of pore size analyzer was used to measure the nitrogen adsorption isotherm of char and the characteristics of pore structure and pore size distributions were obtained. The char pore morphology and micro chemical composition were analyzed in detail. The results show that the pore sturcture of biochar changes complex with the final pyrolysis temperature increasing, the char pore structure, specific surface area and absorption characteristics are fine at 600℃ ; the hole collapses and hybridization appear at l000℃ , micro elements are mainly C, 0, Si and K; There are charcoals and silicide two different structures on the surface of rice husk pyrolysis char at 800℃.
pore structureadsorption curvebiocharpore size distribution
NETL
NSTL
万方数据
维普
