不同环境基准温度变化对回热系统(火用)损变化的影响

摘要

The value of exergy is related to the ambient temperature level. The constant condition(298.16K,0.1 MP) is always used to be the baseline in choosing the value of exergy during the calculation,but the environmental conditions are varied with time and geography. The author investigates the value of exergy about the domestic 300MW, 600MW supercritical units and 1000WM regenerative thermal parameters of the system by selecting different environmental conditions,calculates the exergy loss of the regenerative system heater on this basis ,analysizes the effect of exergy loss for the regenerative system heater on different environmental temperatures. It provides the reference for the regenerative system and even entire unit with the choice of benchmark of exergy analysis.%(火用)值与环境温度的高低有关.我国一般在计算过程中(火用)值的选取是以固定的环境条件298.16K,0.1MP为基准,但是环境条件是随着时间与地域而变化的.通过选取不同的环境条件,对国内300MW、超临界600MW以及1 000WM机组回热系统的热力参数及其(火用)值进行了查值,并在此基础上对回热系统加热器的(火用)损进行了计算,分析了不同环境温度基准对回热系统加热器(火用)损变化的影响,为回热系统乃至整个机组(火用)分析的基准点的选择提供参考.