高超超临界汽轮机开发的关键技术及实施路线

高性价比是新一代700℃高超超临界汽轮机(HUSC)发展的关键。论述了与提高性价比相关技术的发展状况,并对700℃高超超临界汽轮机的高温、高压、二次再热循环及热力系统优化等4大技术特征的性能得益进行分析。介绍了STP高超超临界汽轮机产品分两步发展的技术路线,首先开发配有620℃、大容量中压模块的1 260 MW机型以及35 MPa、660～1 350 MW的二次再热机型,可获取2%～5%的热耗得益;然后在此基础上,应用镍基合金再将温度提高到700℃等级,获取另外5%的热耗得益。高超超临界汽轮机是下一阶段实现节能减排目标最有发展前景的技术。

Key Technologies and Program Implementation for Development of High USC Steam Turbines

The performance-price ratio is a key to develop the new generation of the 700 ℃ class high ultra supercritical(HUSC) unit.The high performance-price ratio developing issues are discussed and relevant technical progress for the 700 ℃ HUSC steam turbine is analyzed.There are four feature benefits of the 700 ℃ HUSC steam turbine,including high steam temperature and pressure,double reheat and optimized thermal cycle.The two steps program in the development of STP’s HUSC turbine is especially introduced.First,the largest 1 260 MW single reheat unit IP module with 620 ℃,and then DRH 660~1 350 MW units with 35 MPa pressure and 600 ℃/620 ℃/620 ℃ will be developed to bring the benefit of relative efficiency improvement of about 2%~5% compared with existing USC single reheat unit.Second,the final goal is to raise the steam temperature as high as 700 ℃ class based on application of Ni-based alloys to bring other 5% benefit.The developments of HUSC can be regarded as one of the promising future technologies that contributes to energy saving and emissions decreasing.