超临界600MW火电机组热力系统的单耗分析

Specific consumption analysis for thermal power system of a 600 MW supercritical power unit

在我国约有80%的电量来自于火力发电,因此准确而有效的节能理论对火电机组节能减排工作具有重要意义。提出了火电机组热力系统单耗分析数学模型,应用该模型以某超临界N600-24.2/566/566机组为例进行热力系统单耗分析计算,得出了各主要设备附加单耗空间分布情况。计算结果表明:该机组实际单耗为b=360.24 g/kw·h(燃煤低位热值q net=22 446 kJ/kg);整个回热系统总的附加单耗为b hr=3.695 2 g/kw·h,其中高压加热器的能损普遍高于低压加热器,除氧器的附加单耗最大;锅炉、管道、汽轮机的附加单耗分别为176.96 g/kw·h,2.72 g/kw·h,21.46 g/kw·h,其中锅炉的附加单耗最大,具有较大的节能潜力。

About 80 percent of Chinese power comes from thermal power, so an accurate and effective energy-saving theory is meaningful for energy conservation. The mathematical model for specific consumption analysis of thermal pow- er systerm was presented. Specific consumption analysis of the main components of a N600-24. 2/566/566 power unit were calculated. The results indicate that the total specific consumption of this unit is 360. 24 g/kw-h （qnee, = 22 446 kJ/kg）. The total specific consumption of regenerative system is 3. 695 2 g/kw.h, and the energy loss of high pressure heaters are higher than those of low pressure heaters. The deaerator has the largest specific consumption in the regenerative system. The specific consumption of the boiler, pipeline, and turbine are 176.96 g/kw.h,2.72 g/kw.h, and 21.46 g/kw-h, so the boiler has a large energy-saving potential.