Lighter coefficient of thermal conductivity jumps over heat preservation brick small, the price is more expensive also, when choosing insulation material, should consider to use requirement and economic benefits, such gift are nicer.
Brick of heat preservation of light qualitative clay pledges firebrick of heat preservation heat insolation and general firebrick are compared gently, weight is light, in-house and even cloth has small air hole, porosity is taller. Accordingly, the quantity of heat that can assure boiler setting be lost is fewer, fuel drops so that charge meets accordingly, light qualitative brick also means smaller harbour quantity of heat at the same time, because this litre of gentle refrigeration is faster, allow to accelerate periodic operation. Firebrick of heat insolation of light qualitative heat preservation applies to 900 ℃ ～ the temperature limits of 1650 ℃ . Brick of light qualitative heat preservation is characteristic: 1. Low heat conduction is led, have effect of very good adiabatic heat preservation; 2. Low hot frit, because low heat conduction is led, mo Laishi series pledges gently the heat energy with adiabatic brick very few save up, energy-saving in intermittent operation effect is apparent; 3. Matter content is low have the oxide content such as alkali metal of low-down iron box, accordingly, fireproof degree tall; The higher volume that contain aluminium makes its still maintain good performance below reducing atmosphere; 4. Intensity of hot condition compression is high; 5. Exterior size is exact, accelerate build by laying bricks or stones to build career, reduce fireproof mud to use an amount, assured the intensity of body of build by laying bricks or stones and stability, prolong the life of liner thereby; 6. Can process special form. Seam in order to reduce number of brick of build by laying bricks or stones and build by laying bricks or stones.
Mo Laishi pledges Mo Laishi of heat preservation brick pledges heat preservation brick uses high pure and fireproof data gently gently, press product demand proportion, join organic and compound filler, via vacuum extrusion, high temperature burns the product of light qualitative Mo Laishi that combines. Pledge gently by right of its and the characteristic with heat preservation superior performance, the hot side that Mo Laishi pledges heat preservation brick applies extensively at a variety of hot project facilities gently is fireproof line or heat-insulation layer, create a condition to raise the energy utilization rate of equipment, with not coming the tall aluminium of Shi Zhujing photograph pledges fireproof material, general alumina content is between 65%-75% . Mo Laishi pledges fireproof temperature can achieve the brick gently 1790 ℃ above. Loading bate begins temperature 1600-1700 ℃ . Normal temperature compression spends 70-260MPa gently. Heatproof shake sex is good. Have agglomeration Mo Laishi brick and electric frit Mo Laishi brick two kinds.
Composition of brick of tall aluminous heat preservation is expressed Brick of tall aluminous heat preservation calls tall aluminium adiabatic brick again. Composition of brick of tall aluminous heat preservation basically is mixed by Molaishi the light qualitative fireproof material that vitreous photograph or corundum constitute jointly. Bulk density 0.4 ～ 1.35g/cm3. Porosity 66% ～ 73% , compression intensity 1 ～ 8MPa. Heatproof shake performance is better. Composition of brick of tall aluminous heat preservation expresses flourish Cheng Naicai to introduce for you. Content of alumina of brick of tall aluminous heat preservation is in 48% , aluminous content jumps over high product performance to had been jumped over.
Brick of tall aluminous heat preservation uses tall aluminous aluminous grog to add a few clay normally, law or bubble law produce with gas after classics mill with slop form pouring, figuration, via 1300 ～ 1500 ℃ are firing. Also can replace partial alumina grog with industrial alumina sometimes. With the liner that builds kiln furnace at build by laying bricks or stones and thermal insulation, and erode without stock of melt of intense high temperature reach erode the place of action. When be being contacted with blaze directly, temperature of watch surface contact does not get prep above 1350 ℃ . Light qualitative tall aluminous brick is belonged to common and intermediate adiabatic firebrick, but regard working layer as 2 light qualitative heat-insulating material commonly at present. Its bulk density 0.4 ～ 1.35g/cm3. Porosity 66% ～ 73% , compression intensity 1 ～ 8MPa. Heatproof shake performance is better.
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 is increased, 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 is reduced. And when stomatic dimension enlarge arrives when certain level, 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 enhance 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 strengthened 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 strengthen. 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.
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