Modeling and parametric studies of heat transfer in a direct-fired continuous reheating furnace |
| |
Authors: | K s Chapman S Ramadhyani R Viskanta |
| |
Affiliation: | (1) Department of Mechanical Engineering, Kansas State University, 66506 Manhattan, KS;(2) School of Mechanical Engineering, Purdue University, 47907 West Lafayette, IN |
| |
Abstract: | A mathematical system model of a direct-fired continuous reheating furnace has been developed. The furnace is modeled as several
well-stirred gas zones with one-dimensional (1-D) heat conduction in the refractory walls and two-dimensional heat transfer
in the load. The load travels either parallel or counterflow to the combustion gases which enter the furnace throughout its
length. The convective heat-transfer rate to the load and refractory surfaces is calculated using existing correlations from
the literature. Radiative heat exchange within the furnace is calculated using Hottel’s zone method by considering the radiant
energy exchange between the load, the combustion gases, and the refractories. The nongray characteristics of the combustion
gases are considered by using a four-gray gas model to treat the mixture as a radiatively participating medium. An extensive
parametric investigation has been completed to determine the furnace design and operating characteristics that lead to optimum
furnace efficiency. The parametric investigations included in this paper study the effects of the load and refractory emissivities
and the height of the combustion space on the thermal performance of the furnace. |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|