The Heat Transfer and Thermal Stress Analysis of an Acting-type Heat Retention Panel and a Hot Blast Stove

Abstract

In the steel process production of molten iron and improvement of the mechanical properties of the strip steel have been a focus for a long time Therefore the numerical simulation was utilized to analyze the heat retention devices in hot strip rolling process and the hot blast stove used in iron making process In the heat retention panel study high temperature transfer bars are transported by conveyors through the heat retention panel in order to decrease the temperature difference between the head and the tail of the transfer bars A three-dimensional numerical model of a traditional passive heat retention panel was developed to investigate the temperature difference between the head and the tail of the transfer bars According to the simulation results it was found that the temperature difference in the transfer bar at FET position between the numerical simulation and the in-situ data was about 1 53% Based on the developed model a three-dimensional numerical model of the acting-type heat retention panel was constructed in order to predict whether the temperature difference decreases during the heat retention process According to the numerical results of the acting-type heat retention panel model providing the heat fluxes on the upper surface of the radiation plate can effectively reduce the temperature difference In the hot blast stove study a three-dimensional finite element model was developed to investigate the thermal stress distribution The numerical results showed that the maximum thermal stress of the refractories was about 25 0 MPa which occurred on the neck of checker chamber and combustion chamber inner refractories of connection and blast pipes The maximum thermal deformation about 249 mm occurred on the neck of checker chamber The maximum thermal deformation on the dome of checker chamber and combustion chamber was about 77 mm and 72 mm respectively Furthermore the shell can also generate stress and deformation because of the temperature difference

Date of Award	2019
Original language	English
Supervisor	Jiin-Yuh Jang (Supervisor)