In this work, the suitability of using Kaolin-Rice husk-plastic clay to produce insulating firebrick was experimentally investigated and the optimal ratio of these constituents determined. Ten brick samples of differe...In this work, the suitability of using Kaolin-Rice husk-plastic clay to produce insulating firebrick was experimentally investigated and the optimal ratio of these constituents determined. Ten brick samples of different compositions were fired at 1200℃. Three of the samples （samples 6, 7, and 8） crumbled during firing. The surviving samples gave the following limits of results： shrinkage： 9. 7% -13.6% ; effective moisture content： 28. 34% -32.52% ; modulus of rupture： 4.26kgf/cm^2 - 19. 10kgf/cm^2 ; apparent porosity： 56% -95. 93% ; water absorption： 42. 27% - 92. 12% ; bulk density： 1.04g/cm^3 - 1. 41g/cm^3; apparent density： 2. 56g/ cm^3 -5. 77g/cm^3 ; and thermal conductivity： 0. 005W/ mK 0. 134W/mK. The results showed that they all had good insulating characteristics. Samples 1 -5 and 10 showed good level of refractoriness, while mixing ratio of 4 ： 1 ： 2 （ representing weight in grams of Kaolin, plastic clay and rice husk respectively） for sample 4 gave the optimum performance values in terms of refractoriness, thermal conductivity, modulus of rupture, shrinkage and bulk density and the effective moisture content.展开更多
The hot load deformation tests of four kinds of insulating fireclay bricks were carried out using a high temperature creep furnace from Sinosteel Luoyang hlstitute of Refractories Reseorch Co. , Ltd. The testing load ...The hot load deformation tests of four kinds of insulating fireclay bricks were carried out using a high temperature creep furnace from Sinosteel Luoyang hlstitute of Refractories Reseorch Co. , Ltd. The testing load was fixed at 0. 069 MPa and the total testing time was with- in 6 h including the holding time of 1.5 h. The hot load defi〉rmation process of insulating fireclay bricks can be divided into three steps ： （ 1 ） expansion step from room temperature to RUL Tmax;（ 2 ） quick shrinkage step be- tween. RUL T and Ttest; 3 ） relatively slow shrinkage step during holding process. The deformation rate at the beginning of holding process （D0h） should be controlled withi, ＋0. 1%. The hot load deformation testing tem- perature of insulating fireclay bricks was optimized as the value of RUL T plus 220℃.展开更多
In order to restrain cement kiln shell＇ s thermal loss and potential safety hazards,composite design was employed of working layer,thermal preservation layer and thermal insulation layer.Thermal preservation layer＇ ...In order to restrain cement kiln shell＇ s thermal loss and potential safety hazards,composite design was employed of working layer,thermal preservation layer and thermal insulation layer.Thermal preservation layer＇ s boundary and strain were analyzed and the overall thermal conductivity was calculated.The result shows that the sinusoidal curve boundary combination is adopted between the working layer and thermal preservation layer,and the slope-shape with angle of 135 degrees between the thermal preservation layer and thermal insulation layer could relieve the strain concentration.Comprehensive thermal conductivity of the composite mullite brick decreases from the working layer 2.74 W·m^（-1）·K^（-1） to1.54 W·m^（-1）·K^（-1）.When applying the composite bricks in cement kilns,the kiln shell temperature is from50 ℃ to 70 ℃ lower than using normal bricks.展开更多
文摘In this work, the suitability of using Kaolin-Rice husk-plastic clay to produce insulating firebrick was experimentally investigated and the optimal ratio of these constituents determined. Ten brick samples of different compositions were fired at 1200℃. Three of the samples （samples 6, 7, and 8） crumbled during firing. The surviving samples gave the following limits of results： shrinkage： 9. 7% -13.6% ; effective moisture content： 28. 34% -32.52% ; modulus of rupture： 4.26kgf/cm^2 - 19. 10kgf/cm^2 ; apparent porosity： 56% -95. 93% ; water absorption： 42. 27% - 92. 12% ; bulk density： 1.04g/cm^3 - 1. 41g/cm^3; apparent density： 2. 56g/ cm^3 -5. 77g/cm^3 ; and thermal conductivity： 0. 005W/ mK 0. 134W/mK. The results showed that they all had good insulating characteristics. Samples 1 -5 and 10 showed good level of refractoriness, while mixing ratio of 4 ： 1 ： 2 （ representing weight in grams of Kaolin, plastic clay and rice husk respectively） for sample 4 gave the optimum performance values in terms of refractoriness, thermal conductivity, modulus of rupture, shrinkage and bulk density and the effective moisture content.
文摘The hot load deformation tests of four kinds of insulating fireclay bricks were carried out using a high temperature creep furnace from Sinosteel Luoyang hlstitute of Refractories Reseorch Co. , Ltd. The testing load was fixed at 0. 069 MPa and the total testing time was with- in 6 h including the holding time of 1.5 h. The hot load defi〉rmation process of insulating fireclay bricks can be divided into three steps ： （ 1 ） expansion step from room temperature to RUL Tmax;（ 2 ） quick shrinkage step be- tween. RUL T and Ttest; 3 ） relatively slow shrinkage step during holding process. The deformation rate at the beginning of holding process （D0h） should be controlled withi, ＋0. 1%. The hot load deformation testing tem- perature of insulating fireclay bricks was optimized as the value of RUL T plus 220℃.
基金National Key Technology Research and Development Program of China during the "12~(th) Five-Year Plan"(No. 2013BAE03B01-10)
文摘In order to restrain cement kiln shell＇ s thermal loss and potential safety hazards,composite design was employed of working layer,thermal preservation layer and thermal insulation layer.Thermal preservation layer＇ s boundary and strain were analyzed and the overall thermal conductivity was calculated.The result shows that the sinusoidal curve boundary combination is adopted between the working layer and thermal preservation layer,and the slope-shape with angle of 135 degrees between the thermal preservation layer and thermal insulation layer could relieve the strain concentration.Comprehensive thermal conductivity of the composite mullite brick decreases from the working layer 2.74 W·m^（-1）·K^（-1） to1.54 W·m^（-1）·K^（-1）.When applying the composite bricks in cement kilns,the kiln shell temperature is from50 ℃ to 70 ℃ lower than using normal bricks.
