以创新技术提高700℃高超超临界汽轮机的性价比

With Innovative Technology to Improve the Supercritical Steam Turbine 700℃ Superb Value for Money

高性价比是燃煤700℃高超超临界发电技术实现产业化的关键。分析性能与价格的折合关系,为700℃发电装备制定了"采取一切可行的先进技术提高机组性价比"的开发原则,示范汽轮机采取流动损失小、可靠性高、运行灵活性好的独特结构机型。在热力循环优化中,采取尽可能多的优化技术,包括二次再热、双机回热抽汽循环及抽汽背压小机、顶端高加配置、双轴高低位布置等一系列创新技术,大幅度提高机组的性能,降低可靠性风险,减少高温镍基材料的消耗,降低设备的制造及运行成本。同时列出一次再热和二次再热两种典型示范机型的主要技术规范及实施方案。

The high performance-price ratio is the key to measure whether the coal-fired 700℃ high ultra supercritical power generation equipment can finally realize industrialization.It analyzes the converting relation of performance-price ratio and works out the development principle for 700 ℃ power generation equipment,i.e.taking all available advanced technologies to raise the performance- price ratio.On the one hand,demonstration steam turbine adopts the unique structure with less flow loss,high reliability,and flexible operation.On the other hand,optimization technologies,including series innovation technologies should be used in thermal cycle optimization as more as possible.These technologies,such as,double reheat,twin unit regenerative extraction cycle and back pressure extraction steam turbine,top feedwater heater configuration,high and low arrangement for cross compound shafts can significantly raise unit performance,lower the risks of reliability,bring down the consumption of refractory nickel base alloy,and reduce equipments manufacturing and operation cost.It also lists main technical specifications and implement plan for two kinds of demonstration units with single or double reheat.