1000MW二次再热火电机组管道热效率对系统热经济性的影响

以某1 000MW超超临界二次再热火电机组为研究对象,定量分析了系统管道的散热损失、厂用蒸汽系统损失及工质泄漏损失对单元机组热经济性的影响.结果表明:考虑全部损失时,管道热效率为97.394%,供电标准煤耗为271.935g/(kW·h).与无管道损失时相比,机组管道热效率降低2.606%,供电标准煤耗增加4.584g/(kW·h),说明在二次再热机组热经济性评价中应该考虑管道热效率.

Influence of Piping Thermal Efficiency on Thermal Economy of a 1 000 MW Double Reheat Power Unit

Abstract. Taking a 1 000 MW ultra supercritical double reheat power unit as the object of study, the influ ence of following factors on the unit thermal economy was quantitatively analyzed, such as the pipeline heat loss, the auxiliary system loss and the working medium leakage loss. Results show that in considera- tion of all above factors, the piping thermal efficiency is 97. 394%, and the standard coal consumption per unit production of power supply is 271. 935 g/（kW · h）, and compared with the condition that no piping loss is produced, the piping thermal efficiency is reduced by 2. 606%, while the standard coal consumption per unit production of power supply increased by 4. 584 g/（kW ·h）, indicat sider the piping thermal efficiency when evaluating the thermal economy ing that it is necessary to con a double reheat power unit.