Kiln furnace liner is important the choice that depends on fireproof material, the character of brick of light qualitative heat preservation raised kiln furnace greatly work efficiency, the production that reduced an enterprise throws cost. Brick of light qualitative heat preservation already was become now finalize the design a substantial of fireproof material. The heat-insulation layer when reaching maintenance is built to pledge the choice of heat preservation brick is attached most importance to especially gently in kiln furnace should.
Brick of light qualitative heat preservation is density of a kind of bulk tall, heat conduction leads low, porosity low heat preservation heat-insulating material, its are low density, low the characteristic that heat conduction leads decided it to go up in application of industrial kiln furnace cannot replace a gender, but rate of low density low heat conduction and intensity are mutual contradiction. National level (each to brick of light qualitative heat preservation function in GB/T3996-1983) raised target, in the standard we see as brick of different type heat preservation of coefficient of thermal conductivity reduce, corresponding intensity also is being reduced. And total sufficient hope can have people a kind of adiabatic brick also has better strength while coefficient of thermal conductivity is low. According to existing standard, coefficient of thermal conductivity is when 0.13W/m·K, fireproof degree for 800-900°C, line change does not exceed 2% below 900 ℃ ×8h, compression intensity 0.8MPa, body density 0.5 G/cm3.
In producing example the dosage of each raw material is as follows: Contain 2 oxidation silicon to be more than the silicon arenaceous 300Kg of 96% , oxidation calcic content is more than the lime 10Kg of 85% , silica content is more than the silicon fireclay 70Kg of 90% , 30Kg of phosphoric acid aluminous cement, industrial aluminous 1Kg, process of preparation of 400-500kg of total water consumption is as follows:
One, according to deserve to compare metage burden, shape of powder of each stock wear, xiang Gui is arenaceous in add water to make a starch and warm-up, ℃ of warm-up temperature 45-50;
2, the agitate in adding the others stock the oar to expect, in after mixing completely, expecting mixture oar, heat to undertake to 65-70°C epispastic, 40% what epispastic quantity is more than gross, epispastic after ending, heat preservation quiet place leaves 2 hours in 40 ℃ ;
3, make into evaporate of the room that enter evaporate after quiet place, evaporate makes pressure 1.2MPa, evaporate makes temperature 190 ℃ , evaporate makes time 9 hours;
4, high temperature agglomeration, temperature 800°C.
When choosing brick of light qualitative heat preservation nothing more than model of qualitative, norms, manage turns capable person the integrated contrast of these a few respects such as function index, the most important of course is the real case that should join kiln furnace itself. Zhengzhou foal amounts to new material to make a simple summary with respect to these a few respects today. The leave out when choosing brick of light qualitative heat preservation for the enterprise a few needless troubles, select the product that fits more.
One. Material of brick of light qualitative heat preservation is qualitative
(1) brick of light qualitative clay: Brick of light qualitative clay belongs to air hole kind light qualitative insulation material, al2O3 content is in 30%-46% . Mix with fireproof clay or light qualitative grog but model clay is main raw material.
(2) tall aluminium gets together light brick: Tall aluminium gets together brick of a light brick is series of light qualitative tall aluminous brick new-style heat preservation heat insolation, basically use tall aluminium clinker and high pure clay, with fill of polystyrene bubble ball, classics is firing light make.
(3) alumina is hollow ball brick: Alumina pink is to choose high grade industry alumina to be raw material, use new-style high temperature to pour blaze kiln and production of scientific to calcine craft, it is artificial concentration, clear to classification, contain impurity little, change it is good to lead stability of tall, shrinkage, consistency.
(4) brick of heat preservation of light qualitative Mo Laishi: It is makings of high grade high pure and fireproof pink, press product demand proportion, join organic and compound filler, via vacuum extrusion, high temperature burns the product of light qualitative Mo Laishi that combines.
(5) diatomite pledges gently heat preservation brick (adiabatic brick) : This product is main raw material with high grade diatomite, wood chip and high temperature binder, via mixing, crowded base shapes, dry hind agglomeration and into.
2. Norms model (dimension)
It is standard brick T-3 commonly usedly commonly (230*114*65mm) , can build dimension to undertake essence of life allows to design according to the build by laying bricks or stones of heat-insulation layer of actual kiln furnace of course, be like: T-38, T-39, T-19, T-20, 2 minutes piece, 3 minutes piece, 4 minutes piece etc, also do not eliminate to need custom-built treatment different with distinctive model brick of light qualitative heat preservation.
3. Manage changes function target
(1) brick of light qualitative clay: According to its function characteristic uses the adiabatic segment in industrial kiln furnace commonly, can reduce furnace kiln heat loss due to radiation, economic energy resources is used up, can reduce the quality of hot project facilities. Also use at sufferring the kiln furnace liner that stock of high temperature melt and aggressivity gas institute erode sometimes. Highest use temperature is in 1500 ℃ of 1200 ～ . Sex of caustic of the mechanical intensity of brick of light qualitative clay, wear-resisting and the aggressivity that fight broken bits is poorer, unfavorable at kiln furnace bearing structure and direct contact the place such as metal of slaggy, charging, melt.
(2) tall aluminium gets together light brick: Have raw material purity even, low heat conduction leads structure of tall, aperture, low thermal capacitance, intensity is high, dimension precision is advanced characteristic. Tall aluminium gets together light brick says tall aluminium gets together again light ball brick, have compression strength tall, thermal shock stability is good, can reduce the thermal capacity of boiler setting, improve the thermal efficiency of kiln furnace.
(3) alumina is hollow ball brick: It is a kind of new-style high temperature heat-insulating material, highest use temperature 1800 ℃ , products machinery intensity is high, those who be general small qualitative products is multiple, and 1/2 what bulk density is corundum goods only. Hollow ball brick applies alumina extensively at the high temperature such as electric induction furnace of reaction furnace of industry of furnace of petrifaction industry aerification, carbon black, metallurgical industry, superhigh temperature on kiln furnace, and obtained first-rate energy-saving result.
(4) brick of heat preservation of light qualitative Mo Laishi: Have expand stability of even, thermal shock creep of tall, high temperature is worth softening point of wonderful, loading small, hardness is big, fight chemistry caustic good wait for a characteristic. The different and main component of brick of light qualitative heat preservation according to density is Mo Laishi to be mixed gently character pledge again. What use temperature according to its is different, model can be divided for series of MG-23, MG-25, MG-26, MG-27, MG-28, MG-30, MG-32 7 kinds. Brick of heat preservation of light qualitative Mo Laishi is one of very important members in heat preservation brick, this kind of product can contact blaze directly (very important characteristic) , have spend tall, coefficient of thermal conductivity high temperature resistantly, gently small, energy-saving effect is distinct wait for a characteristic, apply to crucible of kiln of drawer of porcelain of kiln of path of roller of splitting decomposition furnace, hot-blast stove, pottery and porcelain, report, glass and the liner of all sorts of electric stove.
(5) diatomite pledges gently heat preservation brick (adiabatic brick) : Because a large number of small hole are contained in goods, it and clay are qualitative, tall aluminium is qualitative, float bead pledge and fiber kind adiabatic goods photograph is compared, have compressive strength tall, bulk density is low, coefficient of thermal conductivity is small, have unit weight light, construction safety is convenient, heat preservation is energy-saving the effect is good wait for an advantage with cheap of qualitative actor price. Performance of revulsion of furnace temperature of resistance of 1100 ℃ less than is good, when revulsion of difference in temperature not craze, changeless form.
Clay pledges the content of the Al2O3 in heat preservation brick is a technical index that alludes rarely gently. Fireproof material is worth in the function of this respect is the heat conduction rate that uses data and compressive strength. The compressive strength that we still will study how to raise brick of light qualitative heat preservation and lower its coefficient of thermal conductivity, but as the customer that buys a product, they ask you light qualitative heat preservation to because buy a habit,the brick is via regular meeting. The data of this respect is at present very few, include at present. Firebrick of heat insolation of clay of GBT 3994-2013 of active state level does not beg the content of the Al2O3 in light qualitative adiabatic brick.
Float with fly ash of igneous power plant bead for main raw material, deserve to be mixed with proper binder auxiliary material, make clay brick of light qualitative heat preservation. Uses auxiliary data basically is Yang Quan saggar, its are fineness already sifted through 100 eye, via mixing equably, after suppress shapes, fire of forge of classics high temperature becomes product of light qualitative fireproof heat preservation. EE norms basis bulk density: 0.6g/cm 3, 0.8g/cm 3 and 1.0g/cm 3. 0.8 class can serve as with 1 class without caustic gas medium and the industrial kiln lining that do not contact with melt material or insulation material. It is good energy-saving stuff.
Production of light adiabatic brick bleachs clay mediumly bead basically be hoar brick. Observation falls in optical microscope, some is colorless transparent body, some is opaque translucent body, majority is onefold opacity, bead diameter is 0.3 ～ 200 micron, accumulation density is 0.48gcm3. The tent of Fe_2O_3, CaO, MgO, Na_2O, K2O is taller, classics test, float bead fireproof degree for 1350° . Siliceous natrium, density is 1.45 grams of 1.3 ～ / CM3 vesicant. Commonly used vesicant has black black, black and sulphonate of 12 alkyl benzene, lathery foam is durable the gender is good, acerbity natrium of alkyl benzene sulfur is easy bubbly, but stability is poor. Commonly used bubble stabilizing agent is Nisiluoer (bay radical) , Ethanolamine, 12 alkyl oxide of 2 armour amine, and latter bubble stabilizing agent is better, solidify agent: Natrium of fluorine silicon acid is a kind of better solidify dose, the 14% ～ that dosage is gross 16% . Zinc oxide and 4. According to afore-mentioned material, luo Gang considers to be in 23.32 rooms to compress room temperature to issue light to 1.0gcm3 clay qualitative adiabatic brick to mix refine blandly, catch collect, machinery shapes and the bulk density after agglomeration had a test. Length. When 350 ℃ , the W/(m.K) of average coefficient of thermal conductivity of afore-mentioned material is mixed for 3.5MPa 0.22. Test result and GBT 3994-2013 agree basically.
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