Reliability Design and Compliance Methods of a Complete Set of 1000MW Ultra-Supercritical Thermal Generating Units

Abstract

The reliability design and compliance methods for a complete set of 1000MW ultra-supercritical thermal generating units were presented. In twenty-first century, with the rapid development of installed capacity of 1000MW ultra-supercritical thermal generating units in China, at the end of 2015, there are eighty-three 1000MW ultra-supercritical thermal generating units which were put into operation in China, China has become the country which posses the most 1000MW ultra-supercritical thermal generating units in operation. In order to meet the high reliability requirements of 1000MW ultra-supercritical thermal generating units which have been put into operation, the reliability design methods for a complete set of 1000MW ultra-supercritical thermal generating units are needed in engineering. The calculation formula of the availability deducted planned outage hours from period hours and the reliability calculation models of 1000MW ultra-supercritical thermal generating units were proposed, simultaneously with the calculation and compliance methods for the equivalent availability factor design value of 1000MW ultra-supercritical thermal generating units. The statistical formulas of the reliability characteristic, statistical results for the unit derating factor of 1000MW ultra-supercritical thermal generating units were given, together with the calculation examples and verification examples of equivalent availability factor design value for 1000MW ultra-supercritical thermal generating units. The relative error’s range of the equivalent availability factor design values is between −0.55% to 3.37%, base on the statistical results for reliability of 123-year operation data of eighteen 1000MW ultra-supercritical thermal generating units in 8 thermal power stations. Among them, the absolute value of relative error’s range of equivalent availability factor design values for 120 unit years operation data is less than 1%. Results shows that the calculation accuracy of the equivalent availability factor EAF of 1000MW ultra-supercritical thermal generating units is high precision by using the reliability design methods are given. These reliability design methods may be using in quantitative calculation of the design value of equivalent availability factor, which therefore may serve as a reference for reliability design and improvement of 1000MW ultra-supercritical thermal generating units.