A Nonlinear Lumped-Parameter Dynamic Model of Power Plant Boiler Superheater

Abstract:

Traditional models of power plant boiler superheater are incapable of simulating the operating conditions under large disturbances with high precision. To resolve this challenging problem, this paper presents a nonlinear lumped-parameter dynamic model of power plant boiler superheater. The present model describes the dynamic processes of the pressure-flowrate and the enthalpy-temperature channels with sufficient consideration of their coupling effect. To better capture the distributed-parameter property of superheater temperature, the multi-segment lumped-parameter modeling method is employed for modeling the enthalpy-temperature channel. Dynamic responses of the last-stage superheater of a 600 MW controlled circulation boiler to disturbances of the spray water flowrate, the superheater inlet enthalpy, and the absorbed heat flux are simulated. Simulation results show that dynamic responses of the present model are reasonable, and the model has high precision, which can meet the requirements for full scale simulation and control system simulation.

• Periodical: Advanced Materials Research (Volumes 732-733)
• Pages: 57-62
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.732-733.57
• Online since: August 2013
• Authors: Ying Wei Kang, Yang Xue, Wei Huang, Yi Fan Li
• Keywords: Boiler, Lumped-Parameter, Model, Nonlinear, Superheater

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