熔融ZnCl2-KCl作用下生物质热裂解制生物燃料
首发时间:2012-12-03
摘要:生物质热裂解制生物燃料是生产可持续液体燃料的主要技术,也是生物质热化学转化技术的核心。在自制的热裂解装置中,以氮气(N2)为载气,研究了熔融ZnCl2-KCl作用下生物质热裂解过程,考察了无机添加剂、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)对液相产物进行组分分析。结果表明,FeCl3、CoCl2和NiCl2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,木屑类原料热裂解液体产物产率高于秸秆、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烃类、羧酸类、酮类和酚醛类为主,含氧化合物含量较高,需要精制。研究为农林废弃物等的能源化利用提供了参考。
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Production of biofuel from biomass pyrolysis in molten ZnCl2-KCl
Abstract: It is an important technology for production of sustainable liquid fuel from biomass pyrolysis, and also is the core of biomass thermo-chemical conversion technologies. 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 compositions distribution 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 sawdust was higher than that from other biomass feedstocks 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 hydrocarbon, carboxylic acids, ketones, phenolic and aldehydes were the main organic compounds in liquid products, but the oxygen content was high , which needed to be refined. This research can provide a certain reference for the utilization of agricultural and forestry wasters.
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