• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文会议>Clearwater clean coal conference;International technical conference on clean energy >Modeling Transport of Pressurized Dense Phase Coal
【24h】

Modeling Transport of Pressurized Dense Phase Coal

机译：加压重相煤的运输模型

获取原文
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

A gas-solid model based on CPFD Software's Barracuda Virtual Reactor was developed for a feed system to a pressurized oxy-coal (POC) reactor. A simplified geometry which included vertical coal storage feeding into a 0.635-cm diameter horizontal pipe was used to represent key elements of the feed system. Coal particles were transported from storage through the pipe with CO_2 gas. To ensure appropriate combustion in the reactor, the feed system needed to maintain most importantly a steady flow of gas and solids and secondarily a uniform distribution of solids through the pipe cross-section. Steadiness was determined by variations in coal mass flow rate leaving the pipe. Uniformity was assessed by plotting gas and particle velocities at the end of the pipe. Sensitivity of model results to different mesh size and particle interaction settings was assessed to establish appropriate baseline model settings for this application. From this baseline, the steadiness and uniformity of the flow were assessed for two different design concepts at pressure conditions of 0.1, 0.5 and 2.0 MPa. The gravity-fed concept was found to be not viable due to high ratios of CO_2 flow to coal flow. This was due to gravitational forces being insufficient to carry the desired coal flow into the CO_2 stream. The fluidized bed concept improved CO_2 to coal flow ratios. Here the CO_2 was used to first fluidize the vertical coal bed before transporting it through the horizontal pipe. A wide diameter CO_2 inlet transported higher coal flow rates than a narrow diameter inlet, and was less sensitive to pressure changes due to the more complete fluidization state of the particles. The narrow inlet design provided only localized particle fluidization and was more susceptible to pressure changes, but provided steadier coal flows. In both cases, the coal flow rate was not sufficiently steady as indicated by ratios of standard deviation of coal flow rate to coal flow rate ranging from 0.53 to 0.11. Future work will assess additional design concepts to improve coal flow steadiness.
机译：开发了基于CPFD Software的梭子鱼虚拟反应器的气固模型，用于加压氧煤（POC）反应器的进料系统。简化的几何结构包括将垂直的煤存储进料到直径为0.635厘米的水平管中，用来表示进料系统的关键要素。煤炭颗粒从储藏库中通过CO_2气体通过管道运输。为了确保反应器中适当的燃烧，进料系统需要最重要的是保持气体和固体的稳定流动，其次要保持通过管道横截面的固体的均匀分布。稳定性取决于离开管道的煤炭质量流量的变化。通过绘制管道末端的气体和颗粒速度来评估均匀性。评估模型结果对不同网格尺寸和粒子相互作用设置的敏感性，以建立适用于此应用程序的适当基线模型设置。从这个基准出发，在0.1、0.5和2.0 MPa的压力条件下，针对两种不同的设计概念评估了流量的稳定性和均匀性。由于CO 2与煤的比例高，重力给送的概念被认为是行不通的。这是由于重力不足以将所需的煤流带入CO_2流中。流化床概念提高了CO_2与煤的流量比。在这里，CO_2用于先将垂直煤层流化，然后再将其输送通过水平管。较宽直径的CO_2入口比较窄直径的入口具有更高的煤流量，并且由于颗粒更完全的流化状态而对压力变化不敏感。狭窄的入口设计仅提供了局部颗粒流化，并且更容易受到压力变化的影响，但提供了更稳定的煤流量。在两种情况下，煤流量都不够稳定，如煤流量的标准偏差与煤流量的0.53至0.11的比值所示。未来的工作将评估其他设计概念，以改善煤流的稳定性。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号