The compression intensity of brick of light qualitative heat preservation and use temperature limits, because the porosity of brick of light qualitative heat preservation is tall, strength is consequently general inferior, loading does not bear when be being used normally, get the protection of compact firebrick lining. Still be, to prevent to carry and apply the attaint of classy process, the requirement has proper strength. Below some circumstances, brick of light qualitative heat preservation enrages a contact with blaze and furnace directly, the loading with bear certain, predict in this kind of circumstance when using, the intensity that adiabatic and fireproof mark expects and the ability that fight air current to be used to creation become important.
The intensity of brick of light qualitative heat preservation and bulk density are having close relationship, intensity follows bulk density commonly rise and rise. What ought to notice is to organize structural type to have very big effect to intensity. In bulk density same situation falls, apparent, the intensity of the material with solid successive photograph is higher, and the intensity that enrages successive material is inferior. For example the intensity of the brick of light qualitative heat preservation that the intensity of the brick of light qualitative heat preservation that bubble law produces should give to be produced with combustible law is high.
Because pledge gently many stoma is contained in heat preservation brick, very bigger than the surface, the be heated when using and in bear (be like self-prossessed) below action, the easy happening that systole is out of shape and make heat proof quality is reduced. Accordingly, in asking to pledge the bulk of heat preservation brick and appearance are using a process for a long time gently, can keep stable. Ask to have good bulk stability namely. Otherwise, contractive action can bring about body of heater to the structure is out of shape and produce crackle, increase heat loss due to radiation. Accordingly, heat-resisting function is a of brick of light qualitative heat preservation main index. The hear resistance of brick of light qualitative heat preservation (allow to use temperature) do not depend on normally their fireproof degree, basically is to depend on resistance is heating action produces contractive metabolic ability. The burns contractive quantity in order to weigh to not be more than 2 ％ commonly temperature on international regards light qualitative heat preservation as use temperature of the brick. Next graphic representation gave the use temperature range of bricks of all sorts of light qualitative heat preservation. To the heat-insulating material of same breed, use temperature is commonly as bulk density increase and rise. Apparent, because be in the stuff with bulk old density,this is, the union between solid photograph grain is mixed continuously quite firm, can maintain taller bulk stability consequently.
What does the factor that affects performance of brick of light qualitative adiabatic heat preservation have?
Brick of light qualitative adiabatic heat preservation because structure environment of complex, work is harsh, the factor that affects result of its heat insolation accordingly is very much. And each elements are affected each other, photograph interconnection is, undertake well and truly very hard analytic study. But, in numerous influencing factor, density of the material composition of brick of light qualitative adiabatic heat preservation and structure, porosity and stomatic feature, bulk, temperature is main factor.
(1) the chemical and mineral composition of the composition of material and structural material and crystallization structure are to affect brick of light qualitative heat insolation the chief factor of coefficient of thermal conductivity. Generally speaking, the crystal structure of light qualitative adiabatic brick is more complex, its 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 action the atom with kinetic energy can taller driven (ionic) deliver the other atom with inferior kinetic energy (ionic) , and the atom in vitreous photograph (ionic) arrange to do not have foreword, the resistance that encounters when motion wants than the crystallization photograph that arranges in order tall. The coefficient of thermal conductivity that because this glass photograph wants,compares crystallization photograph is low. 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 increased subsequently. And crystallization photograph criterion to it contrary, lift when temperature, atomic (ionic) kinetic energy increases, vibration increases, bring about free Cheng to shorten, coefficient of thermal conductivity drops subsequently. In the internal composition of light qualitative adiabatic brick, solid alternate with is made the stomatic place space with much differ size, cannot form successive solid according to legend to give to quantity of heat, heat of gas according to legend replaced major solid according to legend to heat up, coefficient of thermal conductivity is very accordingly low.
(2) the porosity of fireproof material and coefficient of thermal conductivity become porosity and stomatic feature inverse ratio, as the addition of porosity, coefficient of thermal conductivity rises sharply. On this, light qualitative adiabatic brick behaves highlight particularly. But to identical porosity, stomatic size is smaller, distributing evener, criterion coefficient of thermal conductivity is smaller. When stomatic dimension small arrive after certain level, the air inside air hole is enraged completely hole wall is adsorptive, make stomatic interior is close to Yu Zhen vacant position, coefficient of thermal conductivity falls floor level. And when stomatic dimension raises fixed rate, the heat radiation between stomatic wall and the convection heat exchange that enrage the air inside aperture to undertake increased, coefficient of thermal conductivity increases. Point out according to relevant document, the heat radiation in persnickety aperture is very small, when air hole is very large, especially the chief body along efflux direction is stomatic, can increase the efficiency of heat radiation, appear even sometimes the heat that contains stomatic goods is conducted want bigger than compact product individual appearance. The coefficient of thermal conductivity that the coefficient of thermal conductivity of closed pore wants to compare open pore is low.
(3) bulk density pledges the coefficient of thermal conductivity of adiabatic brick and bulk density become linear concern gently, namely coefficient of thermal conductivity is increased along with the addition of bulk density. What the size of bulk density reflected porosity of interior of light qualitative adiabatic brick directly is much smaller. Bulk density is small, the hole that shows goods interior is much, the osculatory dot between solid particle is reduced, conductance of caloric solid according to legend is reduced, thereby coefficient of thermal conductivity drops.
(4) temperature pledges the coefficient of thermal conductivity of adiabatic brick and temperature show linear concern gently, namely coefficient of thermal conductivity as temperature lift and increase. But opposite at compact and fireproof material, the addition that pledges the coefficient of thermal conductivity of adiabatic brick follows temperature gently scope is little much. Because compact and fireproof material basically conducts heat for solid photograph,this is, the hot motion aggravate of the element inside the goods when temperature increases, rose to rise coefficient of thermal conductivity. In light qualitative adiabatic brick, its organize a structure to be gas phase structure mostly (65 ～ 78% ) , the metabolic extent of the coefficient of thermal conductivity of the gas phase when temperature is elevatory always is less than solid photograph.
The service life of characteristic of brick of light qualitative heat preservation and furnace of kiln of construction method industry basically is decide by the service life of fireproof material liner, liner is by fireproof and firebrick, pouring makings and brick of light qualitative heat preservation form. The build by laying bricks or stones of kiln furnace builds economic performance to affect the investment cost, character of service, thermal efficiency, the sources of energy that run to use up charge to wait directly, because this chooses to pledge the characteristic of heat preservation brick is gently:
(1) the function of kiln furnace and hot project characteristic. The kiln furnace that works like clearance sex should choose the material with small thermal capacity. (2) intensity of system of the safe use temperature of material, heat conduction, high temperature, chemical stability. (3) use life. (4) investment expenses upholds charge with what move.
Build by laying bricks or stones is built with firebrick cent attachs most importance to qualitative firebrick and light qualitative firebrick (brick of light qualitative heat preservation) . Weighing qualitative firebrick to emphasize particularly on is high temperature stability, chemical stability what wait for; and pledge heat preservation brick is paid attention to gently is sex of heat preservation heat insolation and economy. Value of coefficient of thermal conductivity is little, the adiabatic result that shows insulation material is good, the fare of the sources of energy when moving is low. The fare of investment of charge low specification of insulation material of every unit volume is low, have good investment economy effect.
Method of construction of brick of light qualitative heat preservation pledges the build by laying bricks or stones of heat preservation brick is built gently is a kind of meticulous project, each link should let achieve quality to ask that he must pay attention to essence of life strictly to be checked construction, frequently in construction process. Layer of heat preservation job supports to introduce relevant construction method with kiln wall and kiln below, in order to offer reference. The height of heat preservation wall, ply and overall length beard accord with the regulation of blueprint paper. Its build by laying bricks or stones builds method and clay qualitative firebrick is identical, use fireproof slop build by laying bricks or stones to build. System of build by laying bricks or stones should make sure grey full oar is solid, its plaster is full degree should achieve 95% above. Forbidden use hammer knocks a brick when bricklaying, the face that uses rubber hammer light clap to hit a brick looks for his. Forbidden the knife that use ash chops a brick directly, the cut of applied cut machine that needs treatment is orderly. To avoid heat preservation brick direct with bright fire is contacted inside kiln, of observation hole all around build by laying bricks or stones builds usable firebrick, heat preservation wall and heat preservation cotton and outside of the wall build receive a brick to also apply clay to pledge firebrick build by laying bricks or stones is built.
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