换热系统变工况分析

Off design Performance Analysis of a Heat Exchange System

本文提出了分析系统性能变化的一种新方法,并建立相应的线性数学模型。该方法不仅能分析工况变化时整个换热系统的性能,而且可反映系统内部换热器热量偏差,温度变化及换热器本身的效能。最后以锅炉受热面吹灰为例,将该模型与模拟模型所得结果做比较,说明该方法不仅简单。

A new method for analyzing a heat exchange system performance variation is proposed along with the establishment of a relevant linear mathematical model. The proposed method can not only analyze the performance of the heat exchange system as a whole during a change in operating conditions, but also reflect the thermal excursion and temperature changes of each heat exchanger within the system and also the efficiency of the heat exchanger itself. Finally, by taking the boiler heating surface soot blowing as an example the results obtained from the model and those from a simulated model are compared. It is shown that the proposed method features both simplicity and real time properties.