汽轮机组变压运行热经济特性研究

相较理论计算与传统试验方法,全局动态试验方法在分析结果准确性、实施便捷性以及与调节阀特性相互关联的密切程度等方面更适于精确且完整地描述汽轮机组变压运行热经济特性。数台机组的实施应用表明,由该方法所得到的汽轮机组变压运行热经济特性可反映出定功率下可行阀位区间内不同初压下机组热耗率的连续变化趋势,不仅直观地展现出不同类型汽轮机组定功率变压运行的内在固有规律,而且有助于数值量化调节阀节流调频、调节阀重叠度等对机组热耗率的影响程度,在电力生产过程中具有较为广阔的工程应用价值,可为煤电机组宽负荷调峰运行方式的技术经济比较、汽轮机组配汽端综合优化及其控制策略等方面的研究提供技术参考。

Experimental Study on and Application of Steam Turbine’s Variable Pressure Thermal Economic Characteristics

Compared with the theoretical calculation and the conventional test method, the global dynamic variable pressure test method is more suitable for accurately and completely describing the variable pressure thermal economic characteristics of steam turbines in terms of the accuracy of the analysis results, the convenience of implementation and the degree of close correlation with the flow characteristics of the control valve. The application of several units shows that the variable pressure thermal economic characteristics of steam turbines obtained by using this method can reflect the continuous change trend of the heat rate of the unit with the different initial pressure of the feasible valve range under the certain electric power which not only enables to clearly exhibit the inherent law of the variable pressure operation for different types of steam turbines; but is also helpful for the quantification of the influence of the regulating valve throttling frequency modulation and the regulating valve overlap degree on the heat rate of the unit. This method is greatly applicable in the electric power production process. The study can provide the technical reference for the technical and economic comparisons of the wide load peaking operation mode of the coal motor unit, the comprehensive optimization of the steam turbine and its control strategy.