mechanical stress, and calcining materials erosion wear. Due to simultaneous silicate melt, easily in the environment of high temperature and kiln refractory lining surface interaction between the formation of the initial layer, and at the same time along the internal refractory brick pores to refractory bricks, refractory bricks with bonded together, make the refractory brick surface 10 ~ 20mm within the scope of the chemical composition and phase composition changes, techniques to reduce the performance of refractory brick. When the sintering range of material forming narrow or short flame burning urgency to produce local high temperature, the lowest temperature of kiln will make the skin surface is higher than that of material liquid solidification temperature, kiln skin surface layer from solid to liquid and fall off, and from the outside to the inside into the initial kiln crust is formed after the initial layer of the new kiln crust. When this happens repeatedly, firing zone kiln gradually thinned, even completely off, leading to local exposed kiln body and red kiln. In fact, firing zone kiln lining damage is that, in the high temperature region residual firebrick thickness is substantially larger radius of curvature of the curve distribution of arc bottom, sometimes falls on the inner surface of the kiln.
2014年12月12日星期五
The erosion mechanism of refractory brick
Both the wet process kiln, or new dry rotary kiln, in the clinker calcinations process, because the kiln gas temperature is much higher than the temperature of the materials, kiln rotates one circle, kiln lining surface is subjected to thermal shock cycle, changes in temperature range of 150 ~ 250 DEG C, 10 to 20mm in the kiln lining surface within the scope of generating heat stress. Kiln lining also bear due to the rotation of the brick kiln alternating radial and axial mechanical stress, and calcining materials erosion wear. Due to simultaneous silicate melt, easily in the environment of high temperature and kiln refractory lining surface interaction between the formation of the initial layer, and at the same time along the internal refractory brick pores to refractory bricks, refractory bricks with bonded together, make the refractory brick surface 10 ~ 20mm within the scope of the chemical composition and phase composition changes, techniques to reduce the performance of refractory brick. When the sintering range of material forming narrow or short flame burning urgency to produce local high temperature, the lowest temperature of kiln will make the skin surface is higher than that of material liquid solidification temperature, kiln skin surface layer from solid to liquid and fall off, and from the outside to the inside into the initial kiln crust is formed after the initial layer of the new kiln crust. When this happens repeatedly, firing zone kiln gradually thinned, even completely off, leading to local exposed kiln body and red kiln. In fact, firing zone kiln lining damage is that, in the high temperature region residual firebrick thickness is substantially larger radius of curvature of the curve distribution of arc bottom, sometimes falls on the inner surface of the kiln.
mechanical stress, and calcining materials erosion wear. Due to simultaneous silicate melt, easily in the environment of high temperature and kiln refractory lining surface interaction between the formation of the initial layer, and at the same time along the internal refractory brick pores to refractory bricks, refractory bricks with bonded together, make the refractory brick surface 10 ~ 20mm within the scope of the chemical composition and phase composition changes, techniques to reduce the performance of refractory brick. When the sintering range of material forming narrow or short flame burning urgency to produce local high temperature, the lowest temperature of kiln will make the skin surface is higher than that of material liquid solidification temperature, kiln skin surface layer from solid to liquid and fall off, and from the outside to the inside into the initial kiln crust is formed after the initial layer of the new kiln crust. When this happens repeatedly, firing zone kiln gradually thinned, even completely off, leading to local exposed kiln body and red kiln. In fact, firing zone kiln lining damage is that, in the high temperature region residual firebrick thickness is substantially larger radius of curvature of the curve distribution of arc bottom, sometimes falls on the inner surface of the kiln.
2014年12月10日星期三
Relationship between refractory brick wear resistance and temperature
What is the relationship between the wear resistance of refractory bricks and temperature, so here simply said what is the relationship between the wear resistance of a refractory brick and temperature.
Some materials such as silicon aluminum refractory brick, it is generally believed that under certain temperature (such as 700 ~ 900 DEG C within the elastic range), the higher the
temperature wear resistance is lower, can think that when temperature increase with the increase of elastic modulus decreased, wear resistance. When the temperature rises, reaching a maximum of elastic modulus, with lower elastic modulus, wear resistance increase instead. Such as aluminum silicaterefractory brick in 1200 ~ 1350 DEG C, wear resistance even better than normal temperature, when the temperature is further increased, up to 1400 DEG C + for refractory brick in liquid phase viscosity decreases sharply decreased, wear resistance. Some brick such as chrome quality products, with the temperature increasing, the wear resistance increased.
temperature wear resistance is lower, can think that when temperature increase with the increase of elastic modulus decreased, wear resistance. When the temperature rises, reaching a maximum of elastic modulus, with lower elastic modulus, wear resistance increase instead. Such as aluminum silicaterefractory brick in 1200 ~ 1350 DEG C, wear resistance even better than normal temperature, when the temperature is further increased, up to 1400 DEG C + for refractory brick in liquid phase viscosity decreases sharply decreased, wear resistance. Some brick such as chrome quality products, with the temperature increasing, the wear resistance increased.
Above is the small make up to introduce the content of refractory brick, for more information, welcome to inquire or click the view http://www.chinafirebrick.com/Fire-Brick11.html. For the product, Changxing refractory material factory, welcome to visit: http://www.chinafirebrick.com
2014年12月8日星期一
Using requirements of boiler with refractory material
Boiler burner band main properties of refractory material should have included slag resistance, high strength, wear resistance, thermal stability, thermal conductivity and other 
properties. The traditional refractory belt mainly used chrome refractory ramming material, but because of the domestic high quality chrome resource scarcity, therefore is the main use of silicon carbide ramming material, silicon carbide high alumina coating material, high aluminum phosphate can be plastic, high temperature expansion plastic.
properties. The traditional refractory belt mainly used chrome refractory ramming material, but because of the domestic high quality chrome resource scarcity, therefore is the main use of silicon carbide ramming material, silicon carbide high alumina coating material, high aluminum phosphate can be plastic, high temperature expansion plastic.
Of which the first two kinds of materials of high prices, but the long service life, good performance, and then two kinds of material price is low, but performance in general, and short service life. Therefore in the cyclone furnace liquid slag furnace and should not be used in high phosphate refractoryplastic or ramming material,
to avoid peeling or cracks in use in the production, so as to enhance the slag resistance of material and reduce the repair frequency.
to avoid peeling or cracks in use in the production, so as to enhance the slag resistance of material and reduce the repair frequency.
High-temperature micro expansion refractory plastic and super 3000 water clayrefractory material performance fairly, has shown some advantages in the application to the wall pipe and boiler furnace top. But this kind of material in its solidification time is long, easy to dry shrinkage crack, thus for the construction and maintenance of a great deal of trouble. At the same time the supplier quality there is a certain fluctuation, sometimes refractoriness and normal temperature strength of less than 1580 degrees and 981N/cm2.
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