夹点技术在LNG分馏换热能量优化中的应用

在天然气液化技术工程化研究中,LNG分馏工艺较复杂,且设备种类较多,存在热量利用不充分,公用工程消耗量大的问题,为了节约能源需要对换热网络进行改进。先使用HYSYS软件对分馏工艺进行模拟,得出系统工艺参数,分析现有换热网络能量消耗,得到最小换热温差,再运用夹点技术对分馏区换热网络提出了改造方案。通过改进和优化,充分利用脱乙烷塔底物流的冷量,将分馏区热公用工程消耗量降低了15%,冷公用工程消耗量降低了8%,使用夹点技术对系统工艺和设备参数优化的研究得到了良好的节能效果。

Application of Pinch Point Technology in Energy Optimization of LNG Fractionation Process Heat Transfer

In the engineering research of the nature gas liquefaction technology, not only the fractionation process and device is complicated, but also the consumption of utilities is very large and heat utilization is inadequate. In order to save energy, the heat transfer network should be improved. Firstly the fractiona- tion process was simulated and the process parameters were calculated by HYSYS software, then the energy consumption network was analyzed and the minimum heat transfer temperature difference was found out, finally the optimization and improvement method was presented by pinch point technology in the fractionation process heat transfer network. The cold energy of deethanizer column bottom was used adequate- ly by improvement and optimization, and the consumption capacity of heating utilities decreased 15%, and the cooling utilities decreased 8%. According to the design principles and the criteria of pinch technology, good effect of energy saving was obtained by the optimization research to the fractionation process and device parameters.