熔融ZnCl_2-KCl作用下生物质热裂解制生物燃料

PRODUCTION OF BIOFUEL FROM BIOMASS PYROLYSIS IN MOLTEN Zn Cl_2-KCl

在自制的热裂解装置中,以氮气(N2)为载气,研究物质的量之比为7∶6熔融Zn Cl2-KCl作用下生物质热裂解过程,考察无机添加剂、生物质原料及进料速率对生物质热裂解产物产率的影响,并采用气质联用仪(GC/MS)对液相产物组分进行分析。结果表明:Fe Cl3、Co Cl2和Ni Cl2分别对热裂解的气相、液相和固相产物生成的促进作用明显;在相同热裂解条件下,红木屑热裂解液相产物产率高于秸秆、果壳和油菜花;进料速率增加能促进固相和液相产物的生成,抑制气相产物的生成;热裂解液相产物主要以酮类、酯类、酚类和羧酸类为主,含氧量较高,需精制。

Experiments of biomass pyrolysis were carried out in a self-designed reactor in which the molten ZnCl2-KCl （with mole ratio 7：6） was selected as reaction medium, and N2 was used as sweeping gas. The effects of the species of inorganic additives, species and feeding rates of biomass feedstock were investigated, and the main composition distributions of bio-oil were determined by GC-MS. The results indicated that FeCl3, COCl2 and NiCl2 can obviously promote the formation of gas, liquids, and solid products, respectively. The liquid yield from red sawdust was higher than that from other biomass feedstock such as rice straw, nut shell and rape petal under the same pyrolysis conditions. With the increasing of feeding rates, the char and liquid products increased, but the gaseous products decreased. The ketones, esters, phenolic and carboxylic acids were the main organic compounds in liquid products, but the oxygen content was high, which needed to be refined.