Circular fluid-bed / construction of aerification furnace liner
Of compressive strength of light qualitative firebrick raise a method because light qualitative firebrick makes the matter such as craft, the product that production comes out often compares tall aluminous brick in intensity or argillaceous brick is a lot of poorer, general need increases its compressive strength through a few craft. Improve light qualitative firebrick the method of mechanical function, specific be: Macerate of will light qualitative firebrick is in organic silicon solution, immersion time is 2 ～ 5 hours; The solidify in taking out light qualitative firebrick to put oven receives the compound brick form of organic silicon and firebrick, solidify temperature is 200 ～ 250 ℃ , solidify time is 2 ～ 5 hours; State place compound brick body to be put into atmosphere furnace to heat up splitting decomposition again, temperature of hot splitting decomposition is 800 ～ 1300 ℃ , time of hot splitting decomposition is 1 ～ 3 hours, drop in temperature to get to room temperature modified pledges gently what narrating next firebrick; Whole hot tearing is solved and drop in temperature the process is in reducing atmosphere perhaps undertakes below inert atmosphere protection. This invention and existing technology photograph are compared, basically have the following and distinct effect: In modified process, the porosity that can change light qualitative firebrick scarcely and fireproof degree, but its compressive strength can raise 50 ～ 150 ％ . And have technology simple, easy adjustment and control, but repeatability is good with cost low good point. 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 a proposal to use unexpected step method certainly. Because temperature of face of the cliff outside costly aerification furnace takes corundum brick price normally,be 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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