喷流-移动床的流体力学特性研究
文献类型：学位论文
| 作者 | 陈平 |
| 学位类别 | 硕士 |
| 答辩日期 | 2000 |
| 授予单位 | 中国科学院广州能源研究所 |
| 授予地点 | 中国科学院广州能源研究所 |
| 导师 | 陈勇 |
| 关键词 | 喷流-移动床 最小喷动速度 喷动压降 颗粒循环流率 |
| 学位专业 | 热能工程 |
| 中文摘要 | Refuse Derived Fuel (RDF) is a new-type solid fuel that is made by sorting, crushing, drying, blending and molding from municipal solid waste. It has following characteristics: 1) homogeneous dimension and physical-chemical characters; 2) high heating value (about 2/3 heating value of standard coal) and high volatile (about 70%); 3) easy to store and to transport. To achieve efficient and clean combustion of RDF, a spouting-moving bed reactor is proposed. It includes two chambers: pyrolysis chamber and combustion chamber. RDF was firstly pyrolyzed with scarce air and then the volatile combusted completely in combustion chamber with secondary air. As the preparation of high temperature experiment, the hydrodynamics of spouting-moving bed are firstly investigated at ambient temperature in a 190mm I.D. conical cylindrical perspex column. Our research mainly focuses on the following issues: (1) The minimum spouting velocity with different operation conditions and different bed materials; (2) The spout pressure-drop in the reactor (3) The region of steady spouting (4) The solids circulating flow rate with different operation conditions and different bed materials; According to the cold model test result, part of the parameters of hot model test reactor is determined. The results of cold test follow as: (1) Minimum spouting velocity increases as bed height, particle diameter and particle density increase, decreases as auxiliary gas velocity increases. When auxiliary gas is added, the total gas volume entering spouting-moving bed is larger than that of typical spouted bed but less than the minimum fluidizing velocity. (2) The spout pressure-drop will increase as bed height and auxiliary gas flowrate increase. The relationship of spout pressure-drop and bed height can be described by the Equation (2-5). (3) When auxiliary gas velocity and spouting gas velocity are varied, four different flow regimes are identified and mapped, which are fixed bed, steady spouted bed (spouting with aeration), jetting fluidized bed and spouted bed with pulsation (spout-fluid bed). (4) Solids circulation mass flow rate increases as spouting gas velocity and auxiliary gas velocity increases. At axial direction, solids circulation mass rate firstly decreases as bed height decreases until it reaches the minimum at 160mm (a little above the joint of column and cone) and then increases as bed height decreases the bed height has no effect on the solids ciuculation mass flowrate. (5) The particle flow pattern in the annular is successfully described by a pure dynamic model; the particle and gas flow pattern in the spout can be described by gas-solid phase flow model. |
| 语种 | 中文 |
| 公开日期 | 2011-07-06 ; 2011-07-08 |
| 页码 | 63 |
| 源URL | [http://ir.giec.ac.cn/handle/344007/3843]  |
| 专题 | 中国科学院广州能源研究所 |
| 推荐引用方式 GB/T 7714 | 陈平. 喷流-移动床的流体力学特性研究[D]. 中国科学院广州能源研究所. 中国科学院广州能源研究所. 2000. |
入库方式： OAI收割
来源：广州能源研究所
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