Two-dimensional CFD simulation and pilot-scale experimental verification of a downdraft gasifier: ef

来源 :国际煤炭科学技术学报(英文) | 被引量 : 0次 | 上传用户:chen19107
下载到本地 , 更方便阅读
声明 : 本文档内容版权归属内容提供方 , 如果您对本文有版权争议 , 可与客服联系进行内容授权或下架
论文部分内容阅读
This paper focuses on a two-dimensional CFD simulation of a downdraft gasifier and a pilot-scale experiment for verification using wood pellet fuel.The simulation work was carried out via the ANSYS-Fluent CFD software package with in-house coding via User Defined Function.Three gasification parameters were taken into account in the simulation and validation to achieve highly accurate results;namely,fuel consumption,temperature profile,and syngas composition.After verification of the developed model,the effects of aspect ratios on temperature and syngas composition were investigated.Results from simulation and experimental work indicated that the fuel consumption rate during the steady state gasification experiment was 1.750 ±0.048 g/s.The average steady state temperature of the experiment was 1240.32 ± 14.20 K.In sum,the fuel consumption and temperature profile during gasification from modeling and experimentation show an error lower than 1.3%.Concentrations of CO,CO2,H2,and CH4 were 20.42 vol%,15.09 vol%,8.02 vol%,and 2.6 vol%,respectively,which are comparable to those of the experiment: 20.00 vol%,15.48 vol%,8.00 vol%,and 2.65 vol%.A high concentration of syngas is observed in the outer radial part of the reactor because of the resistive flow of the air inlet and the synthesis gas produced.The average temperatures during the steady state of the gasifier with aspect ratios (H/D) of 1.00,1.38 (experiment),and 1.82 were 978.77 ± 11.60,1256.46 ± 9.90,and 1368.94 ± 9.20 K,respectively.The 1.82 aspect ratio reactor has the smallest diameter,therefore the radiative heat transferred from the reactor wall affects the temperature in the reactor.Syngas compositions are comparable.Inverse relationships between the aspect ratios and the syngas LHV,(4.29-4.49 MJ/N m3),cold gas efficiency (29.66% to 31.00%),and carbon conversion (79.59% to 80.87%) are observed.
其他文献
亚胺基二苯并二氮杂嗪是一类合有3个三级氮原子和2个手性中心的有机碱.它的类似物Tr(o)ger碱已经被用作有机胺催化剂.作为潜在的有机胺催化剂,亚胺基二苯并二氮杂嗪受到了越
邻苯二甲酸酯(Phthalic acid esters,PAEs)又称酞酸酯,是使用最广泛、品种最多、产量最大的增塑剂.研究表明,PAEs是一类环境激素类污染物,具有生殖发育毒性,部分PAEs还具有致
聚对苯二甲酸丁二醇酯(PBT)是一种性能优良的热塑性聚酯结晶性工程塑料,刚性和硬度高,耐磨性极优,热稳定性好,吸湿性较小,耐化学腐蚀性好,具有优良的抗冲击性能,被广泛用于电
目前各地已经开始了秋季粮食征购工作。切实做好这项工作,保证完成今年秋季粮食征收任务和统购任务,乃是我们当前在农村中的一项光荣而艰巨的任务。完成今年秋季粮食征购任
为研究环梵净山河流溶解态重金属的污染水平与分布特征,文章测定了2019年11月至2020年1月间(枯水期)其水体中Cr、Mn、Cu、zZn、As、Se、Cd、Sb、Pb等9种溶解态重金属含量.水
该文根据某柴油污染场地调查和污染物检测结果,利用GMS中MODFLOW和SEAM3D模块建立研究区地下水流模型和典型非水相液体(NAPL)苯、甲苯及乙苯的运移模型研究了NAPL的运移规律,
自19世纪末发现了放射性以后,到目前为止,已发现所有的元素都有放射性同位素,80余种元素具有稳定的同位素.放射性同位素有1500余种,而非放射性同位素也有300多种.同一元素的
中国西北地区处于干旱地带,降水量不多,植被覆盖面积较少,存在较多荒漠化问题,生态环境非常脆弱.在当前西部大开发战略影响下,新疆生态安全目前已成为中国稳定发展最为重要的
4月春暖花开,正是踏青游玩的好时机。家长带孩子春游的同时,往往也会带上相机,留下美好季节中孩子成长的瞬间。下面向家长介绍一些拍摄的实用技巧与心得。1.选对拍摄模式。很
HPLC溶剂要达到以下要求:高纯度、低含水量、低UV背景、优异的批次稳定性、低挥发残留及固体颗粒.总的说来,国产HPLC溶剂尚不能满足需求,进口的溶剂仍占市场主导.如HPLC级叔