The service life of industrial kiln furnace basically is decide by the service life of fireproof material liner, liner is by fireproof and firebrick, pouring makings and heat preservation brick 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.
The characteristic of brick of light qualitative heat preservation is light qualitative, heat preservation, adiabatic.
(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. When choosing brick of light qualitative heat preservation, it is the coefficient of thermal conductivity that uses insulation material commonly (the charge of λ) and insulation material of every unit volume (Ρ) will decide, the product value of “λΡ” heals small had healed. 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
The build by laying bricks or stones of brick of light qualitative heat preservation is built is a kind of meticulous project, each link should let achieve quality to ask to 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.
(1) build by laying bricks or stones of heat preservation brick is built. The height of heat preservation wall, ply and overall length 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.
(2) shop of heat preservation cotton is stuck. Heat preservation cotton board the requirement that dimension wants to accord with a design already, want to satisfy the real need of convenient installation again. The attention answers in installing a process: The contact is close together between cotton board, narrow as far as possible its connect clearance, be in place of cotton board connect, good with adhesion of high temperature binder, make its sealed tight, ensure effect of its heat preservation. The cotton that machines to need board, cut of applied cutting tool is orderly, forbidden with the hand direct tear at.
Weigh the distinction of qualitative firebrick and heat preservation brick:
(1) function of adiabatic heat preservation: The coefficient of thermal conductivity of light qualitative brick is in commonly ℃ of 350± of 0.2-0.4(average temperature) W/m.k, and the coefficient of thermal conductivity of heavy qualitative brick is in ℃ of 350± of 1.0(average temperature) W/m.k above.
(2) fireproof temperature: Those who weigh qualitative brick is fireproof degree in 80 ℃ above, the fireproof temperature of brick of light qualitative heat preservation is commonly under 00 ℃ .
(3) bulk density: Density of brick of light qualitative heat preservation is in commonly 0.8-1.0g/cm3, the density of heavy qualitative firebrick is in at all 2.0g/cm3 above.
(4) compression intensity: The compression intensity of heavy qualitative brick is in 40MPA above, the compression intensity of brick of light qualitative heat preservation is under MPA.
(5) performance characteristics: Firebrick is had stronger fight mechanical concussion, be able to bear or endure chemistry is eroded, wear-resisting function, brick of light qualitative heat preservation has property of taller adiabatic heat preservation.
(6) use place: Heavy qualitative firebrick is commonly used the working layer at contacting blaze or intermediate layer material, brick of light qualitative heat preservation can be used at material of adiabatic heat-insulation layer only.
The compression intensity of brick of light qualitative heat preservation and use temperature limits
Because the porosity of heat preservation brick 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 relation of the intensity of brick of light qualitative heat preservation and bulk density, 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.
As a result ofHeat preservation brickMany stoma is contained in, 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. To the heat-insulating material of same breed, use temperature is commonly rise as the accretion of bulk density. 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.
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