Bermudagrass for biofuels: Effect of two genotypes on pyrolysis product yield
Bermudagrass for biofuels: Effect of two genotypes on pyrolysis product yield
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DOI：
10.1021/ef0604590
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发表时间：
2007-03-01
期刊：
影响因子：
5.3
通讯作者：
Phillips, J. G.
中科院分区：
文献类型：
--
作者：
Boateng, A. A.;Anderson, W. F.;Phillips, J. G.
狗牙根是一种多年生草本植物，在美国南部用作牲畜饲料，并在 10-1500 万英亩土地上收获作为干草。它有潜力作为能源作物，通过木质纤维素转化计划生产生物燃料。 Coastal 于 1943 年发布，一直是主要饲料基因型，直到开发出对反刍动物具有更高产量和质量的 Tifton 85。对在同一成熟度收获并分离成叶和茎的这两种基因型进行热解，以确定它们对热解产物产量的影响。热解在分析热解-气相色谱系统中在500、700和900摄氏度的温度下进行。产生的不凝气体包含CO、CO2、H-2和低分子量烃，估计在10至12.5wt％之间。炭产量在 5.5 至 16 wt% 之间，其余部分包括在冷凝时构成生物油的可冷凝气溶胶，估计为 73-82 wt%，作为生物质与产生的气体和炭之间的差异。方差统计分析表明，由于基因型或样品是叶还是茎，热解产物之间没有显着差异。然而，热解温度对产物收率影响很大，在900℃时气体产量最大，焦炭产量最小。两种基因型的气体热值均达到2300-2500 kcal/kg，约为天然气热值的20-25%。该研究有助于确定，在相同成熟度收获时，狗牙根基因型和植物部分对热解气体和炭产量的影响在热化学转化过程中可能并不显着。然而，没有分析可冷凝液体。
Bermudagrass is a perennial grass used as forage for livestock and harvested as hay on 10-15 million acres in the southern United States. It has potential as an energy crop for the production of biofuels through the lignocellulosic conversion program. Coastal was released in 1943 and was the primary forage genotype until the development of Tifton 85 which has greater yield and quality for ruminants. Pyrolysis of these two genotypes harvested at the same maturity and separated into leaf and stem was carried out to establish their effect on the yield of pyrolysis products. The pyrolysis was carried out in an analytical pyrolysis-gas chromatography system at 500, 700, and 900 degrees C temperatures. The noncondensable gas yielded, comprising CO, CO2, H-2, and low molecular weight hydrocarbons, was estimated between 10 and 12.5 wt %. The char yielded ranged between 5.5 and 16 wt % with remainder, comprising condensable aerosols that constitute bio-oils when condensed, was 73-82 wt % estimated as the difference between the biomass and the produced gas and char. Statistical analysis of variance showed no significant difference between pyrolysis products due to genotype or whether the sample was leaf or stem. However, there was a strong significant effect of pyrolysis temperature on the product yields with the maximum gas yield and minimum char yield occurring at 900 degrees C. The calorific value of the gas reached 2300-2500 kcal/kg for both genotypes, about 20-25% of the heating value of natural gas. The study helps to ascertain that when harvested at the same maturity, the effect of bermudagrass genotype and plant part on pyrolysis gas and char yields may not be significant during thermochemical conversion. However, the condensable liquids were not analyzed.