考虑非等温混合的能量集成水网络设计方法

讨论了能量集成水网络中非等温混合对系统能量目标的影响,提出了分割温度的概念。对于同性混合,系统的公用工程需求量不会减少。对于异性混合,通过确定分割温度并比较分割温度以上区间混合流股的热量之和与低温区间所需的热量,可以准确确定系统公用工程会增加、减少或者保持不变。基于以上思想,得到了非等温混合规则。它能判断是否存在能量惩罚,以及如何通过设计混合温度来避免能量惩罚。结合改进的"分离系统"法,提出了一种系统化的能量集成水网络设计方法。

Design method of heat integrated water networks considering non-isothermal mixing

The effect of non-isothermal mixing on system energy target in heat integrated water networks was addressed,and the concept of "split temperature" was proposed.For homogeneous mixing,system utility requirement will not decrease.For heterogeneous mixing,it can identify whether system utility requirement would increase,decrease or keep the same,by locating the split temperature and comparing the cumulative heat of the mixing streams above the split temperature and the heat demand in the lower temperature intervals.Based on the ideas above,some rules of non-isothermal mixing are presented,which could be used to estimate whether energy penalty exists or not,and to eliminate the penalty by designing new mixing temperatures.Combining them with improved "separate system",a systematic method is proposed to design energy efficient water networks.