Study and Application on an Dynamic Model for the Large Capacity Heat Recovery Steam Generator

With an modular modeling method,a real-time dynamic simulation model for a three-pressure reheat heat recovery steam generator(HRSG)without supplementary firing is developed.After the work mechanism and characteristics of an HRSG are analyzed,the model algorithms of the evaporator system and single-phase medium heat transfer system in the HRSG are discussed on the basis of the mass and energy conservation principle.Along with the relevant modular algorithm(for example,the fluid network,the mix-tank etc…),the complete real-time simulation model is built on the platform of STAR-90 simulation support system,which the simulated object is non-combustion three-pressure reheat HRSG of the first 9F class combined cycle unit in China.The simulation tests show that the mathematical model can correctly simulate the transient process of the simulated object,and has high steady precision and generality.The model can be used for the combined cycle unit simulator development and the control system design and analysis of the HRSG.