摘要
Abstract
In the current context of new power system construction,the proportion of new energy continues to increase,and its stochastic,fluctuating and anti-peaking characteristics force coal-fired units to be in a peaking state for a long time.When coal-fired power units are involved in deep peaking,their power generation efficiency decreases dramatically,the cost of coal consumption,the cost of unit loss and the environmental additional cost increase dramatically,and the deterioration of the turbine performance is particularly serious,and the heat consumption rate of the turbine rises dramatically when the load is deeply shifted.In order to solve this technical problem,a combination of numerical validation and experimental analysis was adopted to take the turbine of a 660MW supercritical unit in a power plant as the research object,carry out numerical simulations of the high,medium and low pressure cylinders of the turbine under wide load conditions,and complete an in-depth study on the trend of changes in the through-flow aerodynamic performance.The results show that the efficiency of high,medium and low-pressure cylinders decreases gradually with the load reduction,and when the load is deeply adjusted to less than 30%,the low-pressure cylinder blowing phenomenon is obvious and the low-pressure final stage blades do negative work,which has a great impact on the performance of the unit.In order to reduce the loss of low-pressure cylinder blowing when the load is deeply adjusted,it is necessary to select the short blade of the last stage in the design and modification,and to reduce the back pressure of the unit as much as possible in the operation process.关键词
深度调峰/汽轮机热耗率/数值模拟/通流气动性能/低压缸鼓风Key words
depth peak shaving/steam turbine heat rate/numerical simulation/aerodynamic performance of through flow/low pressure cylinder blast分类
能源与动力
