A Tuning Tool for Gas Side Heat Transfer Coefficients of a Boiler Model

Yli-Fossi, Timo; Köykkä, Petri; Majanne, Yrjö

doi:10.3182/20120902-4-fr-2032.00033

Cited by 2 publications

(1 citation statement)

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“…The model block calculates time derivatives of metal and refractory walls temperatures. (Yli-Fossi et al, 2011;Yli-Fossi et al, 2012) Pressure point model block calculates time derivatives of pressure and outlet fluid mass flow(s). The calculation of pressure [Pa] for single-phase water and steam is based on the following equation (Lu, 1999) The time derivative of pressure for two-phase liquid and vapour mixture can be calculated as (Lu, 1999 .…”

Section: Basic Process Componentsmentioning

confidence: 99%

Functionality Testing of Water Pressure and Flow Calculation for Dynamic Power Plant Modelling

Yli-Fossi¹

2018

Linköping Electronic Conference Proceedings

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Water pressure and flow rate calculation in dynamic boiler models is challenging because of stiff system dynamics meaning that time constants of model states vary by several orders of magnitude. Furthermore, strong interconnections between pressures and flow variables may cause instability problems in simulation runs. This study presents a method to implement and test dynamic thermal power plant water-steam system models. A dynamic water-steam system model is presented. The model is applied for testing of the functionality of the presented computation model. Computational performance was tested using different numerical solvers. Also sensitivity to changes in initial values of system states and model parameters was tested. The results indicate that a workable way to make flexible models was found.

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