The paper presents the results of numerical computations performed for the furnace chamber waterwalls of a supercritical boiler with a steam output of 2400 × 103 kg/h. A model of distributed parameters is proposed for the waterwall operation simulation. It is based on the solution of equations describing the mass, momentum and energy conservation laws. The aim of the calculations was to determine the distribution of enthalpy, mass flow and fluid pressure in tubes. The balance equations can be brought to a form where on the left-hand side space derivatives, and on the right-hand side – time derivatives are obtained. The time derivatives on the right-hand side were replaced with backward difference quotients. This system of ordinary differential equations was solved using the Runge-Kutta method. The calculation also takes account of the variable thermal load of the chamber along its height. This thermal load distribution is known from the calculations of the heat exchange in the combustion chamber. The calculations were carried out with the zone method.

JO - Chemical and Process Engineering L1 - http://journals.pan.pl/Content/85138/PDF/03-paper.pdf L2 - http://journals.pan.pl/Content/85138 PY - 2016 IS - No 2 June EP - 213 KW - waterwall tubes KW - supercritical steam boiler KW - mathematical model KW - energy balance KW - thermal load A1 - Grądziel, Sławomir A1 - Majewski, Karol PB - Polish Academy of Sciences Committee of Chemical and Process Engineering VL - vol. 37 JF - Chemical and Process Engineering DA - 2016 T1 - Simulation of heat transfer in combustion chamber waterwall tubes of supercritical steam boilers SP - 199 UR - http://journals.pan.pl/dlibra/docmetadata?id=85138 DOI - 10.1515/cpe-2016-0017 ER -