核电厂汽轮机热力系统分析与评审

在核电项目汽轮机评标过程中,发现供货商因忙中出错或因商业利益,提供的热力系统方案会存在参数选择不合理、计算方法不正确等问题.通过推导有疏水或纯疏水级段蒸汽焓值计算方法,采用比焓降更精确、更真实反映机组性能的功率作为效率计算基准,提出理想功率、当量流量和理想焓降三个性能指标,对供货商提供的热力系统方案进行分析与评审,及时发现和纠正了各种错误,合理维护了业主利益.并对在运行核电机组热力系统作计算与分析,提出了机组存在的问题和改进方案.

Analysis and Evaluation of Thermodynamic System for Steam Turbine of Nuclear Power Plants

In the process of turbine bidding assessment for steam turbine of nuclear projects, there were problems with the scheme of thermal system provided by suppliers due to mistakes or commercial interests, such as unreasonable preferences and incorrect calculation methods, etc. A kind of calculation method for steam enthalpy values of stages with partial drainage and complete drainage was presented, and power was chosen to evaluate efficiencies which was more precise and closer to the truth compared with enthalpy drop. Also, performance indicators such as ideal power, equivalent flow and ideal enthalpy drop were given to apply for analysis and evaluation of the scheme, so that the errors were revealed promptly and owners＇ interests were maintained. The method was also applied for calculating and analysis of thermal system of steam turbine for in-service nuclear power station, and some problems and their solutions were mentioned.