“The research team of a 660 MW ultra supercritical boiler proposed the concept of local critical heat load of the boiler, analyzed the combustion stability of the boiler under different loads using numerical simulation methods, and further proposed a stable combustion strategy to increase the power of a single burner under ultra-low loads of the boiler, providing a solution to the problems of deep peak shaving and ultra-low load stable combustion of coal-fired units.”