Moving Boundary Modeling Study on Supercritical Boiler Evaporator: By Using Enthalpy to Track Moving Boundary Location

In moving boundary (MB) modeling, different models are usually adopted to describe the stream generator of supercritical once-through boilers and it is difficult to switching them between different situations smoothly. Taking into heat transfer coefficient influenced by enthalpy of working fluid, we proposes that the enthalpy should be used to track the moving boundary location at supercritical pressure and a nonlinear moving boundary mechanism model for supercritical once- through boiler steam generator is developed in this paper, which can be used for both supercritical pressures and below supercritical pressures without switching. Finally, two simulation examples are presented, and the results show that the model developed in this paper is reasonable.