摘要
为研究与开拓高品位生物油的制备方法,该文以松木粉为原料,采用真空热解的方法制备生物油。讨论了150～830μm的4种不同粒径大小、400～600℃的5种不同反应温度对真空热解的影响,对其原因进行讨论与分析;并对最优条件下的真空热解气液相产物进行表征。试验结果表明,在500℃反应温度下,250～380μm粒径松木粉真空热解得到生物油产率最高,可达52.06%;真空热解生物油的黏度较低,流动性能好,高附加值化合物较多,这些特性使真空热解生物油作为提取化学品的原料成为可能,该研究为生物质制备高品位生物油提供参考。
Bio-oil, biomass fast pyrolysis product, has lots of inferior quality. These drawbacks result in a serious impediment for bio-oil’s practical applications. Although there are many methods for upgrading bio-oil, there is no effective way to solve the problems existing in bio-oil. The aim of the paper is to find a breakthrough from the bio-oil preparation, which using vacuum pyrolysis method to obtain bio-oil from pine straw at bench scale. The influence of temperatures （400-600℃） and biomass dimensions （150-830 μm） on vacuum pyrolysis were investigated. The reaction temperatures were set at 400, 450, 500, 550 and 600℃. The dimensions of feedstock were 150-180, 〉180-250, 〉250-380, 〉380-830 μm. The optimal temperature was 500℃ and at this temperature the biomass with dimension of 〉250-380 could yield the highest liquid product （about 52%） and the lowest solid product （about 25%）. The gas and liquid products from vacuum pyrolysis biomass in the optimal condition were analyzed by GC, GC-MS, FT-IR. The gas product contains H2, CO, CO2, CH4 and CnHm. At the beginning of the reaction, there were high percentages of CO and CnHm in the gas product. With the proceeding of the reaction, the percentage of CH4 became higher and the percentage of CO2 became lower. The percentage of H2 and CO reached its highest point at 40 min. The pH value of the bio-oil was a little low （2.16）. The water content was 46.2%. The viscosity （5.2 mm2/s） was better than that of bio-oil from other pyrolysis methods. Using the area representative compounds content, the GC-MS results indicated that the phenols and ketones were the main compounds in bio-oil, which were 21.98% and 36.55% respectively in the liquid product. The acids contents were 14.27% and the alcohols were 3.08%. The vacuum pyrolysis method, for its simple structure and easily operation, can be a potential way to obtain bio-oil from biomass. Meanwhile, compared with the bio-oil by other pyrolysis methods, the vacuum pyrolysis bio-oil has good flow property and a lot of high valuable compounds. It’s good for further upgrading and obtaining chemicals from vacuum pyrolysis bio-oil.
出处
《农业工程学报》
EI
CAS
CSCD
北大核心
2013年第1期196-201,共6页
Transactions of the Chinese Society of Agricultural Engineering
基金
国家自然科学基金资助项目(51106108)
国家自然科学基金重点资助项目(51036006)
国家科技支撑资助项目(2011BAD22B07)
关键词
农业
生物质
热解
产率
生物油
agriculture, biomass, pyrolysis, yields, bio-oil
