目前国内大多数LNG接收站的BOG蒸发气采用BOG再冷凝工艺。针对BOG再冷凝系统的操作参数对其物料比和能耗产生影响的问题,运用HYSYS对江苏LNG接收站内设计工况下的运行参数进行工艺模拟。在此基础上,单一改变压缩机和低压泵出口压力,用...目前国内大多数LNG接收站的BOG蒸发气采用BOG再冷凝工艺。针对BOG再冷凝系统的操作参数对其物料比和能耗产生影响的问题,运用HYSYS对江苏LNG接收站内设计工况下的运行参数进行工艺模拟。在此基础上,单一改变压缩机和低压泵出口压力,用模拟的实际结果绘制变化趋势图,分析相关操作参数对再冷凝系统工艺和各增压设备功耗的影响以及参数变化趋势的主要原因。在满足工艺要求和最小外输量的前提下,通过合理降低BOG再冷凝器的操作压力,定量地确定了基于江苏LNG接收站再冷凝器操作压力的理论最小值为590 k Pa.a,使站内增压设备功耗最大节省了4.68%,效益可观。同时,明确了大量论文中关于再冷凝器操作压力为0.6~0.9 MPa.a的模糊论述,为其他LNG接收站再冷凝器操作压力的合理选定提供参考依据。展开更多
Valveless piezoelectric pump is widely used in the medical,however,there is a general and difficult problem to be solved:Low vortex and large flow rate are not compatible,resulting in the blood prone to thrombosis dur...Valveless piezoelectric pump is widely used in the medical,however,there is a general and difficult problem to be solved:Low vortex and large flow rate are not compatible,resulting in the blood prone to thrombosis during blood delivery.In this paper,a new valveless piezoelectric(PZT)pump with streamlined flow tubes(streamlined pump)is proposed.The design method and the working principle of the pump are analyzed.The velocity streamlines are simulated,and the results demonstrate that there are no obvious vortexes in the flow tube of the streamlined pump.Five prototype pumps(two cone pumps and three streamlined pumps)are designed and fabricated to perform flow rate and flow resistance experiments.The experimental results illustrate that the maximum flow rate of the streamlined pump is 142 mL/min,which is 179%higher than that of the cone piezoelectric pump,demonstrating that the streamlined pump has a large flow rate performance.This research provides an inspiration for future research on simple structure,low vortex and large flow rate volume-type pumps,and also provides a useful solution for thrombosis preventing.展开更多
文摘目前国内大多数LNG接收站的BOG蒸发气采用BOG再冷凝工艺。针对BOG再冷凝系统的操作参数对其物料比和能耗产生影响的问题,运用HYSYS对江苏LNG接收站内设计工况下的运行参数进行工艺模拟。在此基础上,单一改变压缩机和低压泵出口压力,用模拟的实际结果绘制变化趋势图,分析相关操作参数对再冷凝系统工艺和各增压设备功耗的影响以及参数变化趋势的主要原因。在满足工艺要求和最小外输量的前提下,通过合理降低BOG再冷凝器的操作压力,定量地确定了基于江苏LNG接收站再冷凝器操作压力的理论最小值为590 k Pa.a,使站内增压设备功耗最大节省了4.68%,效益可观。同时,明确了大量论文中关于再冷凝器操作压力为0.6~0.9 MPa.a的模糊论述,为其他LNG接收站再冷凝器操作压力的合理选定提供参考依据。
基金supported by the National Natural Science Foundation of China (No. 51375227)the Introduction of Talent Research Start-up Fund of Nanjing Institute of Technology(No. YKJ201960).
文摘Valveless piezoelectric pump is widely used in the medical,however,there is a general and difficult problem to be solved:Low vortex and large flow rate are not compatible,resulting in the blood prone to thrombosis during blood delivery.In this paper,a new valveless piezoelectric(PZT)pump with streamlined flow tubes(streamlined pump)is proposed.The design method and the working principle of the pump are analyzed.The velocity streamlines are simulated,and the results demonstrate that there are no obvious vortexes in the flow tube of the streamlined pump.Five prototype pumps(two cone pumps and three streamlined pumps)are designed and fabricated to perform flow rate and flow resistance experiments.The experimental results illustrate that the maximum flow rate of the streamlined pump is 142 mL/min,which is 179%higher than that of the cone piezoelectric pump,demonstrating that the streamlined pump has a large flow rate performance.This research provides an inspiration for future research on simple structure,low vortex and large flow rate volume-type pumps,and also provides a useful solution for thrombosis preventing.
