Online Tracking Simulation System of a 660 MW Ultra-Supercritical Circulating Fluidized Bed Boiler

In this paper, an online tracking simulation system for the 660 MW ultra-supercritical circulating fluidized bed (USCFB) boiler is established, and a tracking simulation test is conducted for the cold start-up process of the boiler. The system comprises two parts: the USCFB boiler model and a tracking mechanism based on sliding mode control algorithm. The USCFB boiler model includes a water-steam system, an air-flue gas system, a material supply system, and an ash circulation system. The online tracking simulation system receives the same control signal as the plant and runs synchronously in digital space. The tracking mechanism updates model parameters to eliminate deviations between simulation values and measured values. The SMC-based multi-input, multi-output algorithm is based on a state-space model, providing two distinct advantages. Firstly, it enables more efficient elimination of deviations; secondly, it exhibits robustness against uncertainties associated with simulation model behavior and measurement noise. Finally, this paper conducts tracking simulation research on the cold start-up process of the boiler.