408 / 2018-07-18 23:06:49

Influence of lignocellulosic biomass on the structure and gasification characteristic of co-pyrolysis char

全体主题 > 其它

Co-pyrolysis is a critical initial stage of co-gasification of coal and biomass, and characteristics of the product, especially the structure of char have a significant influence on the subsequent reaction process[1, 2]. The addition of biomass would influence the spatial structure and surface morphology of co-pyrolysis char [3, 4]. It is of great significance to explore the influence of the biomass on co-pyrolysis for their efficient conversion and utilization of coal and biomass [5, 6]. To explore the effect of structure on gasification characteristics of char, two ranks of coal, including anthracite coal (AC) and bituminous coal (BC) were introduced to the pyrolysis of wheat straw (WS). Microlithic and pore textures of char were examined by X-ray diffraction and specific surface area analyzer. Quantitatively analysis from the effect of WS on co-pyrolysis char structure was explored by fractal theory and deconvolution method. Kinetic parameters of gasification were solved via the non-isothermal method. The results showed that WS promoted the specific surface area of both BCWS char and ACWS char, but the promotion on the pore structure, including average pore size, was different. WS inhibited the ordering and uniformity of micro-scale structure of BCWS and ACWS char. Positive synergy from kinetic parameters during gasification of co-pyrolysis char was observed. Exponential relationship from microcrystalline structure parameter and gasification reactivity was found.