TY - JOUR
TI - Analysis of thermal flow in waterwall tubes of the combustion chamber depending on the fluid parameters
AU - Majdak Marek
AU - Gradziel Slawomir
JN - Thermal Science
PY - 2019
VL - 23
IS - 14
SP - 1333
EP - 1344
PT - Article
AB - The article presents the method of determining the temperature distribution  in waterwall tubes of the combustion chamber. To simulate the operating  conditions of waterwall tubes have been selected the model with distributed  parameters, which is based on the solution of equations of the energy, mass  and momentum conservation laws. The purpose of the calculations is  determining the enthalpy, mass-flow and pressure of the working fluid flowing  inside the tubes. The balance equations have been transformed into a form in  which spatial derivatives are on the left, and the right side contains time  derivatives. Then the time derivatives were replaced with backward difference  quotients, and the obtained system of differential equations was solved by  the Runge-Kutta method. The analysis takes into account the variability of  fluid parameters depending on the mass-flow at the inlet of the tube and heat  flux on the surface of the tube. The analysis of fluid parameters was carried  out based on operating parameters occurring in one of the Polish  supercritical power plants. Then it was compared with characteristics for  systems operating at increased or reduced thermal flux on the walls of the  furnace or systems operating at increased or reduced mass-flow of the working  fluid at the inlet to the waterwall tube.