煤与生物质共热解的基础研究
文献类型：学位论文
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| 作者 | 武宏香 |
| 学位类别 | 硕士 |
| 答辩日期 | 2005-05-31 |
| 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 | 李海滨 |
| 关键词 | 煤 生物质 共热解 协同效应 |
| 其他题名 | The Experimental Study on Co-pyrolysis |
| 中文摘要 | Coal plays a dominating role in the primary energy in China which brings serious environmental problems during its utilization. Biomass is a renewable energy. But its utilization is easily limited by seasonal restriction and its own characteristics. The co-gasification of coal and biomass can improve the conversion efficiency of biomass and reduce the emissions of contaminants. Experimental studies on co-pyrolysis of biomass and coal were performed in the thermogravimetric analyzer and in the furnace reactor. The studies were focused on possible synergetic effects between biomass and coal. The synergetic effects were studied from the yield and component of the major prolysis products. The effects of alkali and alkaline earth metals on the biomass characteristics were also studied in the thermogravimetric analyzer. A new co-pyrolysis method was introduced to use coal and biomass. In a two-stage fixed bed, the cracking characteristics of tar derived from biomass pyrolysis in coal char were studied. The main conclusions are drawn as following: (1) The results in the thermogravimetric analyzer show that in co-pyrolysis progress, the biomass volatile releasing temperature increase with increasing amount of lignite in blends. Co-pyrolysis of coal and biomass produces more char than the summation of individual lignite and biomass pyrolysis. The synergistic effects in the co-pyrolysis of biomass and coal are suggested. The co-pyrolysis results of hemicellulose, cellulose and lignin mixed with lignite show synergetic effects litte. The diameter of sample particle has no influence on the synergetic effects between biomass and coal. (2) The co-pyrolysis results of biomass and lignite in furnace reactor show that the yield of gas, liquid and char is coincide with the calculated value. But the content of H2 in gas is lower and the content of CO and CO2 is higher both in blends of RS/lignite and wood/lignite. The H2 from wood/lignite blends was5.89% lower than the calculated value at lignite content 50% while CO was 4.63% higher . The C/H ratio of RS/lignite blends is much higher while that of wood/lignite blends is lower than expectation. Both the gas and char show synergetic effects obviously. The component of tar from blends of biomass and lignite is similar with the tar from biomass or lignite which showes additional effect only. (3) The pyrolysis results of microcrystalline cellulose (mcc) and biomass loaded K, Na, Mg, Ca investigated by thermogravimetric analysis with measurement of products by means of Fourier Transform Infrared Spectroscopy (TG–FTIR) show that the catalytic effect of the metals added on the cellulose is K>Na>Mg>Ca. Potassium catalysed pyrolysis increase the char yields markedly, shift the pyrolysis process to lower temperature, and increase the light organic fraction in volatile components. The alkali metals can lower the average apparent first-order activation energy for pyrolysis. The catalysis of KCl and NaCl is relatively weak compared to KAc and NaAc. KAc and NaAc can prompt the pyrolysis of cellulose into light fractions at lower temperature, especially acids. In biomass, the organically bound alkali metals may catalyse pyrolysis of biomass more than the inorganically alkalis. (4) In a two-stage fixed bed, the cracking results of tar derived from biomass pyrolysis in a high temperature coal char show that both long residence time in char and the higher cracking temperature can decrease the tar yield with the increase of gas yield and H2 percentage. The percentage of H2 and CO can reach 94.51% at the craking temperature 1000℃. The prepare condition of char has influence on the gas yield and composition. Low pyrolysis temperature and short residence time can increase reactivity of coal char and is favor to the higher H2 and CO percentage in gas. |
| 语种 | 中文 |
| 公开日期 | 2011-07-10 ; 2011-07-15 |
| 页码 | 83 |
| 源URL | [http://ir.giec.ac.cn/handle/344007/4035]  |
| 专题 | 中国科学院广州能源研究所 |
| 推荐引用方式 GB/T 7714 | 武宏香. 煤与生物质共热解的基础研究, The Experimental Study on Co-pyrolysis[D]. 广州能源研究所. 中国科学院广州能源研究所. 2005. |
入库方式： OAI收割
来源：广州能源研究所
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