Furnace of kiln of TOP fireproof material applies technical channel begin lecturing, what share to everybody today is the relevant knowledge about brick of light qualitative heat preservation.
Brick of heat preservation of light qualitative clay has very strong performance, but if application is unreasonable, it is good that no matter produce quality,the quantity has many. So, ideal heat preservation result is produced in how making pledge argillaceous brick works in industrial kiln furnace gently. Brick of light qualitative clay is the light simple fireproof product that a kind of aluminous content is 30%-46% . It is main raw material with argillaceous grog or light qualitative grog, use normally can light data standard production, also can use chemical law or bubble law to form poriferous structure. Burden and water mix make but model mud or slop, extruding or pouring, dry hind atmosphere of 1250-1350 ℃ oxidation is firing. Density of commonly used bulk of brick of light qualitative clay is to scale is used in 0.75-1.2g/cm reality of 13 more.
Brick of light qualitative clay gained the favour of manufacturer of most industry furnace with its good performance and low price. The heat preservation that if do not contact blaze place directly,requires only, basic be to use brick of light qualitative clay to replace. What actor drawback does brick of so light qualitative clay have? Loss of accumulation of heat of body of industrial kiln build by laying bricks or stones and heat loss due to radiation of surface of body of heater occupy the 24~45% of specific fuel consumption to control commonly. Use heat conduction to lead the light qualitative brick with low, small thermal capacity to regard structure of body of heater as material, can save specific fuel consumption; In the meantime, because kiln can heat quickly,cool, can raise equipment to manufacture efficiency; Still can reduce weight of body of heater, simplify kiln system structure, improve product quality, drop environmental temperature, improve labor condition. But rate of hole of light qualitative firebrick is old, the organization is inattentive, cannot use at contacting broken bits and liquid state metal directly; Mechanical intensity is low, cannot use at bearinging structure; Wearability is poor, do not suit to be contacted with furnace material, wear away serious. What brick of light qualitative clay allows in its only is highest bear the weight of the adiabatic result with the strongest play of the ability inside temperature limits. In kiln, general liner part often is contacted directly with blaze and slag, apply to heavy brick only. Brick of light qualitative clay basically is used at heating up the heat-insulation layer of equipment and industrial kiln, can use at having the place that fused stock erodes strong high temperature and erodes. A few have fireproof coat with the exterior besmear that blaze contacts directly, with decreasing slag is eroded and soot of heat vital energy erodes, reduce damage. Of course, in be not fusion furnace, it won't be contacted with blaze. In temperature upper limit in the kiln furnace under brick of light qualitative clay, can build with build by laying bricks or stones of brick of light qualitative clay.
Because the structure is complex,affect the factor of function of brick of light qualitative heat preservation, working environment is harsh, the factor that affects result of its heat insolation is very much. And all sorts of elements are affected each other, mutual correlation, hard accurate analysis research. But in influencing factor more circumstance falls, the material of brick of light qualitative heat preservation is comprised and density of rate of structure, hole and hole character, bulk and temperature are main factor. (1) affect light qualitative adiabatic brick the chemical and mineral composition of the composition that the main factor of coefficient of thermal conductivity is material and structural material and crystallization structure. The crystal structure of light qualitative adiabatic brick is more complex, coefficient of thermal conductivity is smaller. The solid photograph of material can be divided simply for crystallization photograph and vitreous photograph. When atom (ionic) as a result of vibration and mutual collision, kinetic energy the atom from high kinetic energy (ionic) the other atom that delivers low kinetic energy (ionic) , the atom in vitreous photograph (ionic) when be being arranged without foreword, what the obstruction prep above that encounters when motion arranges in order is crystal. Accordingly, the coefficient of thermal conductivity of vitreous photograph under crystallization photograph. But lift when temperature when certain level, the viscosity of vitreous photograph is reduced, atomic (ionic) athletic obstruction is reduced, the coefficient of thermal conductivity of vitreous photograph also increases. Contrary, when temperature is elevatory, atomic (ionic) kinetic energy increases, vibration increases, bring about free Cheng to shorten, coefficient of thermal conductivity is reduced. In the internal composition of brick of light qualitative heat preservation, solid photograph is separated by the aperture of a lot of different measurement, cannot form successive solid according to legend to heat up. Heat of gas according to legend replaced most solid according to legend to heat up, coefficient of thermal conductivity is very accordingly low. (2) the hole rate of fireproof material and coefficient of thermal conductivity become inverse ratio. As the addition that hole leads, coefficient of thermal conductivity rises quickly. Right now, pledge adiabatic brick is highlighted particularly gently. But lead to same hole, hole size is smaller, distributing evener, coefficient of thermal conductivity is smaller. When hole size small arrive when certain level, the air inside aperture is complete by hole wall adsorption, make vacuum state is approached inside aperture, utmost ground lowers coefficient of thermal conductivity. When hole size raises fixed rate, heat exchange of convection of the airy inside the heat radiation between aperture wall and aperture increases, coefficient of thermal conductivity increases. According to relevant document, alveolus heat radiation is very small, hole is very large, especially the long aperture of edge efflux direction, can promote efficiency of high fever radiant, sometimes even the heat conduction of aperture product is bigger than compact product. The coefficient of thermal conductivity of closed pore under open pore. (3) bulk density pledges coefficient of thermal conductivity and bulk density show linear concern gently, namely coefficient of thermal conductivity increases along with the addition of bulk density. The size of bulk density reflected the hole rate of interior of light qualitative adiabatic brick directly. Bulk density is small, explain product interior hole is much, the osculatory dot between solid grain decreases, conductance of caloric solid according to legend is reduced, coefficient of thermal conductivity is reduced.
(4) the coefficient of thermal conductivity of brick of light qualitative heat preservation and temperature show linear concern, lift and increase what coefficient of thermal conductivity follows temperature namely. But compare with phase of compact and fireproof data, the coefficient of thermal conductivity of light qualitative adiabatic brick wants along with the addition of temperature small much. Because compact and fireproof material basically is heat of solid according to legend,this is, when temperature is elevatory, the hot motion aggravate of the element in the product, raised coefficient of thermal conductivity. In brick of light qualitative heat preservation, its organize a structure to be gas phase structure more (65~78%) , the change of coefficient of thermal conductivity of the gas phase when temperature is elevatory always is less than solid photograph.
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