Hydrodynamic Analysis and Metal Temperature Calculation for the Water Wall of a 660MW Supercritical Boiler at Severe Peak Load Regulation

摘要

As variable renewable energy establishes an ever-greater role in electricity systems, so demands placed on conventional generation structure are changing in China. However, how to absorb the new energy and solve the peak shaving problem has become a key factor restricting the development of new energy in China. Chinese coal-based energy resources structure determines coal-fired power plants to take more severe peak load regulation. Peak shaving task is a new requirement for coal-fired power units for a long period of time in China, and the boiler of coal-fired power units hydrodynamic safety evaluation of peak load regulation is an important part of it. The hydrodynamic calculation and experimental study of a 660 MW supercritical boiler at deep peak load regulation were carried out in this paper. On the basic of the boiler structure and combustion mode, a network system mathematical model of a 660MW boiler was established. The results of the calculation indicate that when the boiler load reach 26% BMCR, the hydrodynamic characteristics and water wall temperature of the boiler are all within the safe range. According to the calculation results, the actual low-load experiment on site was carried out. The experiment results show that there are no safety problems in the boiler under 26%BMCR too, and the measured data of water wall temperature agree with the calculation well.