长栈桥码头增压系统设计及应用

Design and application of pressurization system on wharf with long approach bridge

码头设置增压系统是解决卸船泵自身扬程不足导致输送距离较短的有效途径之一。针对长栈桥码头增压系统设计问题进行工艺输送方案、增压泵选型及控制技术研究,采用管路特性曲线与泵组流量-扬程曲线耦合等研究方法,结论是在码头平台设置增压泵,船泵与增压泵之间缺少有效缓冲,上下游泵流量难以匹配,极易造成增压泵抽空现象,在条件允许时不应作为首选方案,应按最大卸船流量及最大黏度确定增压泵的流量和扬程,且不宜再取设计余量,否则将严重偏离泵的额定工作点,影响泵的正常运行。绘制不同卸船流量及黏度介质的管路特性曲线和泵组合运行流量-扬程曲线耦合图,有效解决最优泵组合运行及控制方案难以确定的问题。

0ne effective way to solve the problem of short transmission distance caused by insufficient head of the unloading pump is to set up a pressurization system in wharf.In view of the design problem of the pressurization system on the wharf with long approach bridge,this paper conducts research on process transmission scheme,selection of booster pumps and control technology.The research methods such as the coupling pipeline characteristic curves and pump set flow-head curve are adopted.The conclusion is that when a booster pump is installed on the wharf platform,there is a lack of effective buffering between the ship pump and the booster pump,the upstream and downstream pump flow rates are difficult to match,which can easily cause the booster pump to be emptied.It should not be used as the first choice when conditions permit.The flow rate and head of the booster pump should be determined according to the maximum unloading flow and the maximum viscosity,and the design margin should not be taken,otherwise it will seriously deviate from the rated working point of the pump and affect the normal operation of the pump.Drawing the pipeline characteristic curves and the coupling diagram of pump combined operation flow-head curve for different unloading flow and viscosity medium,it can effectively solve the problem that the optimal operation of pump combination and control scheme are difficult to determine.