直方体耐火物のスポーリング強さと熱応力評価法

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For the purpose of designing a long life furnaces, much efforts toward preventing thermal spalling attack of inner lining refractories have been made. The present study has been undertaken to investigate the quantitative effect of the size, heating conditions, and external constrains on the thermal stresses induced in a rectangular refractory heated from one end. The main results obtained are as follows : 1) According to the result of F.E.M. calculations, a large tensile stress (σ_z) perpendicular to the hot face which may cause thermal spalling cracking is induced along the center axis of a refractory heated from one end. 2) σ_z can be well approximated by the sum of two 2-dim. solutions, each corresponding to the analysis on the x-z plane and y-z plane. 3) The maximum thermal stress (σ^M_Z) perpendicular to the hot face is approximately obtained using nondimensional functions H_<stress>, H_<strain>, which are monotonously increasing functions. σ^M_Z≅α・E・T{ζ_x・H_<stress> (a/√<kt>)+ζ_y・H_<strain> (b/√<kt>)} Here, α : Thermal expansion coefficient, E : Young's Modulus, T : Temperature of hot face, a, b : widths of hot face, k : thermal diffusivity, t : elapsed time, ζ_x, ζ_z : parameters representing external constrains. Through this Eq. effects of sizes, heating condition, external constraints on the thermal spalling can be obtained quantitatively. It also explains the experimental results fairly well.
社団法人日本鉄鋼協会の論文
1982-01-01

直方体耐火物のスポーリング強さと熱応力評価法

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