Furnace Wall Thermal Stress Analysis Of Blast Furnace Hearth Shell Cracking

Blast furnace is the most common way of iron making used in our country today. The large iron and steel enterprises in our country keep the volume of blast furnace large-scale, and the blast furnace develops towards high-yield and strengthening smelting. In order to improve productivity and reduce iron costs, extend the life of blast furnace become an important issue to be solved for steel industry. The longevity of the blast furnace is also an important sign of iron making technology. Blast furnace hearth is the core part of the structural safety, which is the storage container of molten iron. The life of hearth furnace wall determines life of blast furnace. There are mainly two forms of damaged in hearth area, the breakage of refractory lining and the furnace shell crack leading to the lining destroyedThis article takes the furnace wall structure of blast furnace hearth as the research object, and focuses on the furnace shell cracking problem. The author creates lining-cracked furnace shell double furnace wall model with the ANSYS parametric design language-APDL. On this basis, the article based on steady-state heat transfer theory, convective heat transfer theory, reasonably defined boundary conditions. Based on the results of theoretical deduction, which are contact surface temperature and cooling conditions-standard convective heat transfer coefficient, ANSYS simulates the double furnace wall temperature field with the crack. Analyzing lining in masonry, ovens and normal working hours deformation, use thermal stress theory reasonable fixes masonry-lined elastic modulus and coefficient of linear expansion. Use thermal-structure coupling to simulate the thermal stress conditions. According to the contact analysis theory and actual situation, the furnace shell contact with lining and sliding are taken into account. Take the furnace shell crack tip elastic-plastic deformation into account. The article discusses the influential factors of lining outer maximum hoop stress.The results obtained from simulation of thermal stress conditions compares with previous studies, which is one-dimensional furnace shell cracking reinforcement criterion. The subjects obtained results in the three-dimensional solid simulation are more accurate. This topic featured work includes that using the theory of convective heat transfer which are fluid swept the flat outside heat transfer and jet impingement heat transfer roughly determine the operation of the furnace shell spraying's convective heat transfer coefficients; author considers the sliding contact between the furnace shell and the lining and detailed discusses the shrink and swell of lining carbon brick and connecting mortar in masonry, ovens and practical work, which effects the physical properties of carbon brick; considers that the furnace shell crack tip may occur elastic-plastic deformation problems. The article achieves whole process of APDL parametric design.The research has important reference value in improving the development of blast furnace design and construction techniques and reinforcing maintenance programs of cracking blast furnace shell.