内构件对移动床内颗粒物料流动特性影响的离散模拟
发布时间：2018-07-18 09:29
【摘要】：针对煤热解移动床反应器中需保证颗粒物料呈整体流流动状态的设计需求,采用离散单元法模拟了闭合型(圆形、三角形)和非闭合型(八字形)3种不同内构件设置对移动床内颗粒物料流动特性的影响.结果表明,闭合型内构件设置下,当系统中形成稳定颗粒流动后,流动区宽度近似等于无内构件条件下流动区宽度与内构件在流动方向上最大投影尺寸的加和;非闭合型内构件设置下,根据内构件安放位置及翅片间距,可形成3种不同的流动结构,当翅片间距等于出口尺寸时,流动区宽度最大.在所考察的参数范围内,存在最优的内构件安放位置(30d)和翅片间距(20d)(d为最大颗粒直径),能使移动床出口处颗粒质量流率显著大于无内构件情况下的颗粒质量流率.
[Abstract]:In order to meet the design requirement of ensuring the flow state of particles in a moving bed reactor for coal pyrolysis, a discrete element method is used to simulate the closed type (circular, circular and circular). The effects of triangle and non-closed (octahedral) on the flow characteristics of particles in moving bed are studied. The results show that the width of the flow zone is approximately equal to the sum of the width of the flow zone and the maximum projection size of the inner member in the flow direction when the steady particle flow is formed in the closed inner member. Three different flow structures can be formed according to the position of the inner members and the fin spacing. When the fin spacing is equal to the outlet size the width of the flow zone is the largest. In the range of parameters investigated, there is an optimal position (30d) and finned spacing (20d) (d as the maximum particle diameter), which can make the particle mass flow rate at the outlet of the moving bed significantly larger than the particle mass flow rate without internal components.
【作者单位】： 中国矿业大学(北京)化学与环境工程学院;中国科学院过程工程研究所;中国科学院大学化学与化工学院;
【基金】：国家自然科学基金项目(编号:21576265) 中国科学院“百人计划”项目 多相复杂系统国家重点实验室仪器设备项目
【分类号】：TQ051.13
，
本文编号：2131483
[Abstract]:In order to meet the design requirement of ensuring the flow state of particles in a moving bed reactor for coal pyrolysis, a discrete element method is used to simulate the closed type (circular, circular and circular). The effects of triangle and non-closed (octahedral) on the flow characteristics of particles in moving bed are studied. The results show that the width of the flow zone is approximately equal to the sum of the width of the flow zone and the maximum projection size of the inner member in the flow direction when the steady particle flow is formed in the closed inner member. Three different flow structures can be formed according to the position of the inner members and the fin spacing. When the fin spacing is equal to the outlet size the width of the flow zone is the largest. In the range of parameters investigated, there is an optimal position (30d) and finned spacing (20d) (d as the maximum particle diameter), which can make the particle mass flow rate at the outlet of the moving bed significantly larger than the particle mass flow rate without internal components.
【作者单位】： 中国矿业大学(北京)化学与环境工程学院;中国科学院过程工程研究所;中国科学院大学化学与化工学院;
【基金】：国家自然科学基金项目(编号:21576265) 中国科学院“百人计划”项目 多相复杂系统国家重点实验室仪器设备项目
【分类号】：TQ051.13
，
本文编号：2131483
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