基于能级总组合曲线的化工过程功-热公用工程设置

采用微分法计算能级，由此生成新的能级组合曲线，获得全流程的总能量目标。提出新的热-功集成图形方法--能级总组合曲线，在获得加热/冷却公用工程目标的同时得到系统所需功量目标，以及过程?损。以甲醇合成工艺为例，通过能级组合曲线和能级总组合曲线分析，获得功需求量为28 MW，冷公用工程用量为137 MW，减少能量消耗71.1%，并选择电能和循环冷却水作为甲醇工艺的公用工程。

Optimal placement of work and heat utilities in chemical plants via energy level grand composite curve

In order to construct a novel energy level composite curve, the energy level concept is calculated by the differential concept. The new composite curve is capable of providing total energy target for the whole system. An energy level grand composite curve is further proposed to realize the simultaneous integration of thermal and work. The thermal target, the work target and the process exergy loss can be obtained in the energy level grand composite curve. The methanol synthesis process was selected for case study. Through graphic analysis of the energy level composite curve and the energy level grand composite curve, the work demand is 28 MW, the cold utility is 137 MW, and the energy consumption is reduced by 71.1%. Electricity and circulating cold water were selected as the utility of the methanol process.