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生物油水溶性组分水蒸汽重整制氢研究
文献类型：学位论文
| ; | |
| 作者 | 蔡炽柳
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| 学位类别 | 硕士 |
| 答辩日期 | 2009-05-30 |
| 授予单位 | 中国科学院广州能源研究所 |
| 授予地点 | 广州能源研究所 |
| 导师 | 闫常峰 |
| 关键词 | 生物油 水溶性组分 制氢 白云石 CO2吸收 |
| 其他题名 | Study on Hydrogen Production by steam reforming of bio-oil aqueous fraction |
| 中文摘要 | With the development of economy and the growth of population, the demand for energy has been growing larger and larger. Among those energy resources, fossil fuel is not renewable and causes great pollution. Hydrogen, a form of ideal clean secondary energy has increasingly attracted attention worldwide. Hydrogen production from biomass has been heavily focused on in recently years for the feedstock is renewable. One possible way is to convert biomass into bio-oil, a liquid featuring larger energy density than bio-oil and favorable for transportation and storage, then to be steam reformed to produce hydrogen. As carbon dioxide is produced during the reforming process, the removal of it will result in the shift of the equilibrium to the direction that favors hydrogen production. In this paper, calcined dolomite was used as the carbon dioxide sorbent to enhance the hydrogen production. Experiments were carried out in a laboratory scale fixed-bed and influencing factors like temperature, particle size were investigated. Based on the investigation, following conclusions have been reached: The thermal decomposition of dolomite used in the experiment is divided into two steps, first the dolomite was decomposed into CaCO3、MgO and CO2 in an atmosphere of N2 at 700°C, followed by further decomposition into CaO、MgO at about 800°C. The temperature of decomposition reaction increased in an atmosphere of CO2, which can be illustrated by the fact that decomposition temperature under CO2 atmosphere is 870°C. The product of calcined dolomite begun to absorb CO2 in an atmosphere of CO2 at the range of 400°C-750°C,which was under the gain process of the product of calcined dolomite.The product absorbing CO2 begun to decompose above 800°C,and it did until 900°C,above which its quality never changed. The experiment of catalytic steam reforming bio-oil aqueous fraction led to the following findings: reducing temperature is conducive to improve hydrogen content, and increasing temperature is conducive to improve hydrogen yield in the temperature range of 500~700°C. Large-sized and small-sized particles seem to have better performance in hydrogen production than medium-sized particles. The highest hydrogen yield of 75% was obtained when the steam to bio-oil ratio was 4.5. To further increase the steam to bio-oil ratio seems to have negative effect on hydrogen production. This could be explained by the fact that water was pumped into the reactor to vaporize, which means too much water may lead to the drop in the reaction zone due to its large latent heat. Sorbents were regenerated to perform cycle test. The hydrogen content varied little among different cycles, while the hydrogen yield dropped slightly. Dolomite was pretreated to improve its absorption capability. The hydrogen production after pretreatment showed better performance, with a hydrogen content of 93% and a hydrogen yield of 80% being reached, both of which were larger than that before the pretreatment. The catalytic steam reforming for the case of dolomite shows 83 % hydrogen yield which is much higher than the one of the CaO (56%) and the one without CO2 absoption (42%), and shows 80% hydrogen content which is slightly lower than the one of the CaO (85%), that is come from that more carbonaceous deposit or tar converts into gas product for the dolomite. |
| 语种 | 中文 |
| 公开日期 | 2011-07-14 ; 2011-07-15 |
| 页码 | 60 |
| 源URL | [http://ir.giec.ac.cn/handle/344007/5842]  |
| 专题 | 中国科学院广州能源研究所 |
| 推荐引用方式 GB/T 7714 | 蔡炽柳. 生物油水溶性组分水蒸汽重整制氢研究, Study on Hydrogen Production by steam reforming of bio-oil aqueous fraction[D]. 广州能源研究所. 中国科学院广州能源研究所. 2009. |
入库方式： OAI收割
来源：广州能源研究所
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