Alumina is hollow ball brick
Aerification furnace uses liner of furnace of fireproof material aerification fireproof material divides a layer in all, from in outside arriving ordinal zirconium of the lead that it is chromium pledges fireproof material, chromic corundum pledges fireproof material, alumina is hollow the ball is qualitative fireproof material (the graph shows) 1 times. Pledge to aluminous zirconium of igneous face chromium firebrick is the crucial part that makes sure aerification furnace moves normally among them. From the top down of fireproof material composition is ordinal inside furnace for the 3 parts end vault, cylindrical shell, awl. To facilitate of firebrick local change, bottom of vault, cylindrical shell, awl is designed can change independently.
Because firebrick of 1 Xiang Huo face is direct to fire contact with coal dissolve broken bits, it is aerification fireproof material makes in furnace / the place with I] slashing condition, so to fire brick chooses brick of 90 chromic aluminous zirconium () of Zuo chromic brick. The synthesis of Cr203 report frit that place of brick of chromic aluminous zirconium is Cr203 content to be more than 99[wiki]%[/wiki] with raw material expects (bulk density is more than 5.1g/cm3) , add at the same time have exceed fine pink, grind via mixing, after shaping firing in kiln of type of high temperature shuttle. This product has bulk density big (be more than 4.25g/cm3) , porosity low (be less than compression of 16%) , normal temperature big (be more than 120Mpa) , the merit with the little matter content such as ferric oxide and oxidation silicon, have the very good stability that heat up voice at the same time function, fight function of Zuo lukewarm creep to wait. These satisfied aerification furnace to use the requirement of fireproof material to igneous face, so brick of 90 chromic aluminous zirconium is current the beautiful of fireproof material chooses side of aerification furnace Xiang Huo.
Brick of 2 backs line carries line brick on the back to be located in backside of Xiang Huo face brick, whole of fireproof to aerification furnace material is having the main mechanical effect that prop up, and can endure Zuo lukewarm of next caustic gas erode. Intensity of normal temperature of brick of 12 chromic corundum is very high (be more than 120Mpa) , and high pure the oxidation that 12% above add in corundum is chromic more the performance that increased gas of this goods corrosion resistance to erode.
After brick of heat insolation of heat preservation of brick of 3 heat preservation is located in brick back line, have heat preservation effect to aerification furnace, make hot loss is reduced, temperature of the wall outside making maintains be worth in set, it is alumina of a kind of very good energy-saving material; hollow ball brick is led besides heat conduction low (outside 0.8W/mk/1000°C) , intensity of normal temperature, high temperature is light simple fireproof stuff in good, and matter content is extremely low, have very good corrosion resistance gas erode ability and ability of amortize thermal stress, it is current light qualitative heat preservation is fireproof the material of beautiful of the function in material.
Compressible makings has compressible layer of A of 4 other and auxiliary material small, heat conduction leads unit weight low characteristic, have property of very good heat preservation heat insulation, have particular strength again at the same time, can significant cushion Zuo is lukewarm issue li of radial of a fireproof material to expand, and construction is very convenient.
B is fireproof and pouring expect (chromic corundum is pouring makings, alumina is hollow the ball is pouring makings) . Chromic corundum is pouring makings use at vault and awl bottom, pouring expect with the brick photograph comparing has the following advantage: Seam without ash, namely construction of integral sex good; is convenient, especially the construction of complex structure, when industry of convenient and quick, province, province, save labour. Pouring of makings fight aeriform aggressivity strong, be more than 2.95Mg/cm3 as a result of bulk density at the same time, make pouring makings have very good air-tightness. Alumina is hollow the ball is pouring makings have thermal insulation energy-saving, construction is convenient wait for an advantage, suit aerification furnace local use.
Liner of aerification furnace firebrick, light qualitative firebrick and build by laying bricks or stones build a method to protect aerification furnace casing body and space of high temperature reaction is formed inside furnace, statified inside body of aerification furnace casing build by laying bricks or stones builds firebrick liner and light qualitative firebrick, in order to reduce furnace heat loss due to radiation, improve thermal efficiency.
The service life of aerification furnace, depend on greatly the service life of firebrick liner, to firebrick liner, besides Ying Congcheng treatment, chemical composition, the respect such as agglomeration method and temperature tries to assure outside, in the Henan on the operation fireproof material factory suggests to still accomplish the following: 1. Litre fall furnace temperature do one's best firm, avoid by all means is steep litre steep fall. Heating because of firebrick liner and in cooling process, caloric is conducted and brick is departmental the balanced need that divides temperature is certain process and time, if this process time is too short, should cause brick like that each part difference in temperature is bigger, systole is inhomogenous, and even occurrence safety hidden danger. 2. Litre fall furnace pressure Yi Li is begged smooth, avoid by all means is steep litre steep fall. Because firebrick liner cannot assume the pressure inside aerification furnace, can rely on steeliness furnace casing to assume only. Rising, in step-down process, as a result of aeriform pressure by reaction space to furnace casing deliver (step up) and react to aerification by furnace casing of the space deliver (step-down) also should have a process. Accordingly, want to assure the stability of furnace pressure, prevent firebrick liner to bear greater pressure and burst apart. Because operate undeserved or appearance controls malfunction, happen to flow into water of water gas catharsis aerification furnace on occasion sometimes inside. This kind of accident can make firebrick liner smashs, be forced to change. High temperature of center of aerification ingle blaze can amount to 1700 ℃ above, because of liner of this lining firebrick fireproof degree (the temperature that liner begins to fuse) do not answer under 1790 ℃ . At the same time requirement firebrick liner is able to bear or endure " urgent cold urgent heat " the number is high the aggressivity of He Nairong broken bits is strong. Manufacturing practice makes clear, use corundum brick more appropriate. The main constituent of corundum brick is Al2O3, its content is in 95 ％ above, content of good corundum brick Al2O3 amounts to 99 ％ above, be close to pure Al2O3. Brick of this kind of corundum is made with electric frit method normally, its are fireproof spend and loading softening point all brick of more general corundum is tall. Build about the build by laying bricks or stones of firebrick liner and heat preservation brick, total principle is to be in center of aerification furnace the chamber of a stove or furnace to stand by high temperature blaze to be in build by laying bricks or stones to build fireproof degree of tall corundum brick, the each brick layer that is close to with furnace wall stage by stage, its temperature drops stage by stage, right fireproof spend a requirement to reduce, and very tall to the requirement of heat preservation function, chase a layer to use brick of tall aluminous brick, clay brick, light qualitative clay, light qualitative diatomite respectively consequently brick, asbestine board. Liner of aerification furnace firebrick (corundum brick) two kinds of build by laying bricks or stones build a method: The one build by laying bricks or stones that it is vertical stroke (or say to establish) of build by laying bricks or stones, the one build by laying bricks or stones that it is a horizontal stroke (or call flat build by laying bricks or stones) . Law of perpendicular build by laying bricks or stones can reduce dosage of brick of the corundum that build furnace; And, bricky layer is thin, difference in temperature is small, the appearance that all does not cause disintegrate as a result of stress consequently is little. When the overhaul, need to change only inside can. But, because layer of corundum brick brick is thin, average temperature is high, fall for a long time at high temperature, burn contractive degree again big, with li of layer that stands by it easy generation is fore-and-aft between the brick displacement, card breaks thermocouple bushing, serious when cause frit of whole brick layer to collapse. This kind of method although second measure with firebrick little, but produce situation of afore-mentioned systole, displacement easily, those who cause firebrick change the number increases, total dosage is not certain little. Unexpected step law second build furnace to be measured with corundum brick more. But, because bricky layer is thick, the brick is average temperature is low burn contractive phenomenon again lighter, to every firebrick character, its temperature distributings standing by blaze end is higher, and the one end that nears furnace wall criterion temperature is inferior, compression strength is good, burn shrink degree is small, sink not apparent, the stability of layer of whole corundum brick is consequently good, avoid layer of abate perhaps brick fore-and-aft displacement phenomenon. Although,this kind of build by laying bricks or stones builds a method second measure with firebrick bigger, but because service life is longer, the wastage that presses time accumulative total does not increase certainly, the proposal uses unexpected step method.
Because corundum brick price is high, for the use of managing corundum brick, go up according to aerification furnace, below 3 paragraphs of medium, temperature distributing different, can use the firebrick liner of different material. On general aerification furnace, mid blaze temperature is high, firebrick liner frit collapses the time is much, still hold to good with quality corundum brick. Aerification furnace bottom, because aeriform temperature is inferior, can convert fireproof degree inferior tall aluminous brick. Assure the service life of aerification furnace.
Temperature of face of the cliff outside aerification furnace is taken normally for 80, 150 ℃ , but from reduce heat loss due to radiation to set out, it is better to should take floor level to be worth, because this requirement uses heat preservation property,better heat insulating materials perhaps increases the ply of heat-insulation layer appropriately. Such doing, although data bad news is used more, investment cost is high, but decrease as a result of furnace heat loss due to radiation, amiable bad news all can reduce oily cost, in addition, because furnace itself thermal capacity is large (heat up laziness namely big) medicinal powder heat is little, can avoid furnace temperature wave motion, under photograph comparing, the operation goes to the lavatory neatly, it is good that its run furnace. Computation makes clear, of moving charge save those who exceeded material cost to increase.
Fireproof material occurrence craze, fall off, easy how to wear away to do? Want to solve a problem thoroughly, need to be dug from germ, the analysis gives real reason, flourish Cheng Naicai is engaged in be able to bear or endure service of timber production, research and development is old, can solve all sorts of difficulty problems of liner of furnace of high temperature kiln, welcome broad new old friend to seek advice reach technical communication.
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