Temperature and Thermal Stress Analysis of a Hot Blast Stove with an Internal Combustion Chamber

Abstract

In this study, the temperature and thermal stress fields of an internal combustion hot blast stove were calculated and analysed. Turbulent, species transport, chemical reaction, radiation, and porous media models were implemented in a computational fluid dynamics model. Thermal boundary conditions on the structure of the hot blast stove were calculated based on the analytic adiabatic Y-plus method. A method to interpolate the thermal boundary conditions to a finite element mesh was developed, and the boundary conditions were mapped through the proposed method. In the on-gas period, the vortex was generated in the dome, and it made the variation of the temperature field in the checker chamber. The maximum temperature of the flue gas reached 1841 K in the on-gas period. In the on-blast period, the flow was considerably even compared to the on-gas period, and the average blast temperature reached 1345 K. The outer region of the checker chamber is shown to be continuously exposed to a higher temperature, which makes the region the main domain in managing the deterioration of the refractory linings. The shell temperature did not change during the operation due to the lower thermal diffusivity of the refractory linings, where the inner surface of the refractory had a maximum temperature change from 1441 K to 1659 K. The maximum temperature of the shell was 418.4 K at the conical region of the checker chamber side. The conical region had the higher maximum and middle principal thermal stresses due to the presence of a large temperature gradient around the conical region, where the largest maximum and middle principal stresses were 300.6 MPa and 192.0 MPa, respectively. The conical region was found to be a significant area of interest where it had a higher temperature and thermal stress.

Stress Corrosion Cracking Analysis of a Hot Blast Stove Shell with an Internal Combustion Chamber

“…Moreover, although the acid condensation value would be decreased, the SCC characteristics of increased temperature and the increased thermal stresses caused the CPR to have a much higher tendency. In addition, the tendency became lower compared with the cases of an increase of 45 K and 90 K. Maximum principal stress of the shell on the conical part along the circumferential direction for the reference blast temperature [28] and for the blast temperature increased by 45 K and 90 K.…”

“…The temperature distributions in accordance with the increase in the blast temperature are described in Figures 2 and 3. The temperature and stress calculation results for the reference blast temperature can be found in the authors' previous publication [28]. Figure 2 shows the temperature distributions at t = 40 min, at the midpoint of the on-gas period.…”

“…The effect of the acid condensation was taken into account as a weight factor to calculate the SCC growth rate. In this study, the primary focus was on investigating the SCC growth rate, while the computational fluid dynamics and thermal stress analysis models are not described in depth in this paper since these models were thoroughly documented in the authors' previous publication [28]. A brief description of the computational fluid dynamics model for the hot blast stove is described in Appendix A.…”

“…The temperature difference between the shell and the flue gas was calculated based on the simulation results presented in the authors' previously published paper [28].…”

“…Temperature distributions of the refractory linings at the midpoint of the on-gas period (t = 40 min) for (a) the reference blast temperature[28], and for the blast temperature increased by (b) 45 K and (c) 90 K. Temperature distributions of the refractory linings at the midpoint of the on-blast period (t = 130 min) for (a) the reference blast temperature[28], and for the blast temperature increased by (b) 45 K and (c) 90 K.…”