Modeling and simulation of the start-up process of a 660MW ultra-supercritical circulating fluidized bed boiler

This study involved the development of a full-scale dynamic simulation model for a 660MW ultra-supercritical circulating fluidized bed (CFB) boiler-with the largest scale and maximum capacity. The boiler is presently under construction in China and includes a water-steam system, an air-flue gas system, a material supply system, and an ash circulation system. The gas-solid flow in the furnace was modeled based on the core-annulus flow structure, and the six-equation solution for the water-steam flow was used to simulate the dynamic behaviors of the water-steam system. Based on a design condition of 50% turbine heat acceptance (THA), a steady-state simulation model was established and calibrated. Consequently, cold and hot start-up processes at 0-50% THA were simulated to investigate the dynamic behaviors of the CFB boiler. Compared with the design conditions, the steady-state and transient simulation models demonstrated high accuracy.

Automated summary

This study developed a dynamic simulation model for a 660MW ultra-supercritical circulating fluidized bed (CFB) boiler, which is the largest in scale and capacity in China. The model includes the water-steam system, air-flue gas system, material supply system, and ash circulation system. The gas-solid flow in the furnace was modeled based on the core-annulus flow structure, and a six-equation solution was used for the water-steam flow. The steady-state and transient simulation models showed high accuracy when compared to design conditions.