TY - JOUR
T1 - Characterization of the temperature distribution on steel tubes for different operating conditions in a reheating furnace using CFD and three different measuring methods
AU - Landfahrer, Martin
AU - Prieler, Rene
AU - Mayr, Bernhard
AU - Gerhardter, Hannes
AU - Zmek, Thomas
AU - Klarner, Jürgen
AU - Hochenauer, Christoph
PY - 2018/3/25
Y1 - 2018/3/25
N2 - In the steel industry, there are a number of common methods for determining the temperature distribution of steel goods. In a reheating furnace, knowledge of the inlet and the outlet temperatures is of great importance since these temperatures have a significant effect on both the gas input to the furnace as well as downstream processes. Excessive temperature fluctuations can also be prevented, ensuring uniform temperature distribution, close to the target temperature. In this work, three different measuring methods, differing in their measuring principles, are compared and validated using computational fluid dynamics (CFD). These methods include a two-colour pyrometer and an infrared camera (IC), which measures the surface temperature of the tubes. Furthermore, local temperatures are evaluated using the results of a test tube equipped with several thermocouples. In order to verify the measurements and the CFD simulations, an additional operating condition is taken into account. The operating conditions differ in their gas distribution to the individual zones, and, thus, in the heating characteristics of the tubes. The numerical model used is based on both a steady and a transient simulation, keeping the calculation time low. In the steady state simulation, the steady flamelet model (SFM), using the detailed CH4 mechanism skeletal25, serves to characterise combustion. The heating of the tubes is depicted by means of the transient simulation. These different methods of measuring temperature show good agreement with the CFD results, and their respective advantages and disadvantages are apparent.
AB - In the steel industry, there are a number of common methods for determining the temperature distribution of steel goods. In a reheating furnace, knowledge of the inlet and the outlet temperatures is of great importance since these temperatures have a significant effect on both the gas input to the furnace as well as downstream processes. Excessive temperature fluctuations can also be prevented, ensuring uniform temperature distribution, close to the target temperature. In this work, three different measuring methods, differing in their measuring principles, are compared and validated using computational fluid dynamics (CFD). These methods include a two-colour pyrometer and an infrared camera (IC), which measures the surface temperature of the tubes. Furthermore, local temperatures are evaluated using the results of a test tube equipped with several thermocouples. In order to verify the measurements and the CFD simulations, an additional operating condition is taken into account. The operating conditions differ in their gas distribution to the individual zones, and, thus, in the heating characteristics of the tubes. The numerical model used is based on both a steady and a transient simulation, keeping the calculation time low. In the steady state simulation, the steady flamelet model (SFM), using the detailed CH4 mechanism skeletal25, serves to characterise combustion. The heating of the tubes is depicted by means of the transient simulation. These different methods of measuring temperature show good agreement with the CFD results, and their respective advantages and disadvantages are apparent.
KW - Assessment of temperature measuring methods
KW - Combustion modelling
KW - Extensive validation
KW - Mother tubes
KW - Reheating furnace
UR - http://www.scopus.com/inward/record.url?scp=85040337347&partnerID=8YFLogxK
U2 - 10.1016/j.applthermaleng.2017.12.098
DO - 10.1016/j.applthermaleng.2017.12.098
M3 - Article
AN - SCOPUS:85040337347
SN - 1359-4311
VL - 133
SP - 39
EP - 48
JO - Applied Thermal Engineering
JF - Applied Thermal Engineering
ER -