蒸汽动力系统在不同工况下的凝水分配协调性分析

目的]为满足蒸汽动力系统在不同工况下的使用要求,需开展凝水分配协调性分析和管路优化设计。方法]基于Flowmaster仿真计算软件,建立凝水系统的管网仿真模型,分析低工况和高工况下的凝水系统压力和流量分配情况,并相应提出降低水柜安装高度和调整系统管路连接方式这2种优化设计方案。结果]计算结果表明:在低工况下,当凝水系统中节流阀开度30%、循环阀开度45%时,储水量最大为0.128(归一化处理结果),当节流阀开度小于13%时,凝水系统将无法实现储水功能;在高工况下,当凝水系统中节流阀开度90%、循环阀开度18%时,储水量最大为0.404,且凝水系统的分配协调性更好;2种优化设计方案均可有效改善低工况下凝水系统的分配协调性。结论]研究成果可为实船凝水系统的管路优化设计提供参考。

Analysis of the condensate water distribution of a steam-powered system in different working conditions

Objectives]To meet the use requirements of a steam-powered system in different working conditions,it is necessary to study the design of the condensate water distribution and pipeline optimization.Methods]Using the Flowmaster software,a simulation model of a ship's condensate water system was created.The pressure and flow rate in the condensate water system were studied in different working conditions of the steam-powered system.Based on this,two optimal design suggestions,reducing the installation height of the water tank and adjusting the system pipeline connection,were presented.Results]The calculation results showed that the maximum storage capacity is 0.128(normalization result)when the openings of the throttle valve and circulation valve are 30%and 45%respectively,in reduced working conditions.Moreover,when the throttle valve opening is less than 13%,the condensate water system will not be able to store water.The maximum storage capacity was 0.404(normalization result)when the openings of the throttle valve and the circulation valve were 90%and 18%respectively,in increased working conditions.The distribution coordination of the system was also better.Two optimization designs can effectively improve the condensate water distribution in reduced working conditions.Conclusions]The research results can provide a reference for the optimal design of the actual ship's condensate water system.