The effect of expansion gap on the thermal stress for a hot blast stove

Abstract

The research used the software package ANSYS to simulate #34 hot blast stoves in China Steel Inc and analyzed the effect on thermal stress for expansion gap The study was divided into three parts The first part was the analysis of expansion gap for one dimensional simplified model The results revealed that expansion gap could effectively reduce the thermal stress and the reduced value was the largest in case that the expansion gap was filled by air The hoop stress on inner side of brick reduced 57 % from -18 26 MPa to -7 88 MPa Whenever the expansion gap was filled by Rockwool the larger the Young’s modules was the less the reduced stress would be The second part was thermal stress simulation of actual hot blast stove For bricks the maximum value of first principle stress was 4 84 MPa which was occurred on lower end of checker roof The maximum value of third principle stress was -10 96 MPa which was occurred on the junction of connecting pipe and checker roof Besides the value of equivalent stress of steel shell was the largest on turning point of both roof which was 311 MPa The third part compared the difference between hot blast stove without expansion gap and with rockwool expansion gap The results revealed that except the first principle stress the others reduced significantly The maximum value of the third principle stress of brick reduced 70% from -18 51 MPa to -5 61 MPa The maximum value of the equivalent stress of steel shell reduced 63% from 611 MPa to 227 MPa Although brick could afford higher compressive stress than tensile stress mortar could absorb the tensile stress on brick To sum up the arrangement of expansion gap could effectively make the structure firm

Date of Award	2020
Original language	English
Supervisor	Jiin-Yuh Jang (Supervisor)