Cement kiln should satisfy cement to produce the demand of craft with fireproof material, introduce cement kiln to use for everybody today be able to bear or endure material requirement and maintenance, read detailed content please.
Cement kiln resolves the kiln demand to fireproof material beforehand 1. Mechanical intensity and intensity of high temperature structure are higher below normal temperature, no matter inside kiln firing state how, the temperature inside kiln should be in 10000C above, temperature of bate of requirement firebrick loading is high. 2. Thermal stability is close friends, fight kiln temperature namely acuteness it is good to change and do not get destructive ability. When the temperature inside kiln produces acuteness change, change of the temperature inside kiln is very big, in stop kiln, kiln and moving condition is flabby and time, requirement kiln line won't appear chap or flake, answer to make the temperature inside kiln stable as far as possible. 3. Prevent chemistry to erode, when the fire inside kiln, what what form is grey. Broken bits. Vapour can be corroded to kiln line generation. 4. Wearability and mechanical intensity are high, of the stock inside kiln skid grind with what enrage the dust in flowing, make kiln line generation wears away. Open kiln initial stage especially, period still is protected without kiln skin inside kiln more such. High temperature bears to fall even inside kiln expand stress and kiln canister ellipse are out of shape the stress that cause. To kiln line the requirement has particular mechanical strength. 5. Kiln liner has good kiln skin to register kiln performance, kiln skin is hanged on liner brick, protect action to arriving since furnace brick, if liner brick has property of very good the skin that hang kiln, and kiln skin can be maintained longer, can make kiln wall does not suffer erode with wear away. 6. Air hole wants small, if air hole is larger, can cause corrode kiln to enrage infiltration line brick, destroy line brick, especially alkalescent gas. 7. Heat bilges cold shrink stability is good, although the hot coefficient of expansion of kiln cylindrical shell compares kiln line want big. But kiln canister temperature spends the left and right sides in 280-450 commonly, and the temperature of kiln line brick is in commonly 800 degrees of above, firing take temperature to be 1500 degrees, the heat of liner bilges the quantity wants than kiln canister big, kiln line is easy happen flake. 8. Low chromium or do not contain chromium, reduce chromic social effects of pollution. 9. Have good water-resisting property.
Cement kiln has good wearability with firebrick and brick of its utility argil, fight urgent cold sex, thermal conductance small; But its are high temperature resistant, be able to bear or endure chemistry is eroded, compression intensity is low. Price of fire prevention brick is cheaper, often use at all sorts of kiln furnace. Tall aluminous brick is used in rotary kiln to burn commonly on the belt. Opposite at argillaceous brick, its temperature of fireproof, to load is high, the performance that fight broken bits is good. Magnesian firebrick has magnesia brick. Magnalium brick. Chromic magnesia brick. After the chromic magnesia brick that uses strip of fire cement kiln is the MgO agglomeration of 55%~80% , get Cr2O3 is in containing the alkalescent and fireproof material of 8%~20% , this product fights broken bits, fight corrode, fight high temperature capability good, intensity is high; But heat conduction rate is old, fight difference of urgent cold, urgent cold sex, and the price is high, adornment sex is poorer. If use proper, can make periodic twice grows, the life of a few factories can reach 400~500 day. Save magnesian qualitative firebrick to want to notice moistureproof, storage period cannot exceed half an year. When laying a brick, n-joining (brick and bricky 2~3 millimeter, t-joining (circle and circle) for 5~6 millimeter) , squeeze the brick in order to prevent when high temperature expands crack, because the coefficient of expansion of magnesia brick compares aluminous brick,control one times higher. When kiln ignites, warm up stage by stage. Phosphatic brick is a kind of when in recent years development rises new-style and fireproof material, it is to use phosphate and burn aluminous collect to expect machine pressing shapes, make as adhesive with the phosphoric acid solution of 42.5%~50% . The brick that is bond preparation with phosphoric acid aluminium is fought for phosphate grind a brick. Two kinds of afore-mentioned bricks are not fired brick, al2O3 content is made an appointment with 80% when, have high temperature resistant, fight corrode, combat urgent cold sex, wear-resisting, strength tall, thermal conductivity is good wait for an advantage, but thermal conductivity is bigger. Phosphatic brick is applied to firing belt, phosphatic wear-resisting brick applies to heat to conduct belt, heat to conduct belt and heat to pass conduction band extreme. Phosphatic brick is replacing tall aluminous brick gradually, apply extensively in cement industry. Also be called concrete of low calcic aluminous acerbity salt brick, it is by 20% fireproof cement the collect of the distinct size of.80% is expected, mix with water and become, become via water conserve (water ash is compared for 0.5:1, namely 1kg cement adds 0.5kg water) . Its make a method simple, make easily, cost is low. Its are big defect is intensity low, do not be able to bear or endure urgent cold urgent heat, appear easily statified phenomenon, cycle of run is short. Choose the grain of high strenth grog of diametical 3~8 millimeter, join cement to make mature material. Before use, it is the embellish that use water very wet, save left and right sides of a month. Commonly used take at microtherm (wet) of kiln chain belt. This is the raw material of the firebrick that every factory produces, can oneself are produced, the price is low. Because use the place of this kind of firebrick little, dosage is little, the trend that existing to fall into disuse. Light qualitative firebrick has favorable heat preservation effect, also be a kind of new-style and fireproof material at the same time, its wearability, fight urgent Leng Xinghe to heat up gender and felt brick by force to comparative, but brick of clay of adiabatic effect outclass, can reduce heat preservation performance, can reduce aggregate medicinal powder hot sex.
Because of intake air heater, decompose furnace to be fixed equipment, equipment case is bigger, fireproof material presses two structures, outer it is thermal conductance low, the heat-insulating material with low also intensity, working layer is to have particular strength and the fireproof stuff that can counteractive basic material eats. Body is complex. Furnace kiln is flat-roofed in reaching the makings below small diameter to be in charge of, use more fireproof and pouring makings. To one. 2. 3 class intake air heater can be used fireproof degree of alkalescent and fireproof material that is more than 1000 ℃ , 4. 5 class intake air heater and decompose furnace should satisfying high temperature resistant below the premise of function, choose brick of high strenth alkali resistance or excel in alkali resistance is pouring makings build by laying bricks or stones is built. Of kiln head dry warm up the system cannot satisfy intake air heater and the dry requirement that decompose furnace sometimes (comb with a double-edged fine-toothed comb is cold implement. What kiln head cover and tertiary air canal accord with kiln system is dry add lukewarm system, list alone no longer) , accordingly, what undermentioned kiln fastens is roast warm up the requirement that the system should combine this division. If kiln furnace system warms up to 600 ℃ (it is accurate) with temperature of kiln end smoke evacuation, criterion one class intake air heater did not achieve dry requirement, should lengthen kiln to fasten 600 ℃ to be heat preservation time. High temperature resistant pouring expect in temperature 25 ℃ are controlled, not less than 24h(adjust conserve time low cement is pouring for makings, want take into consideration the circumstances to lengthen 48h) , pouring expect after achieving particular strength, pull down pattern plate and bracket, undertake after 24h roast. If conserve temperature is too low, extend conserve time even. End extraction kiln discharges wind temperature, with 15 ℃ / H warms up speed comes 200 ℃ , heat preservation 12h. Warm up speed is 25 ℃ / H, heat preservation time is 400 ℃ , heat preservation time is 6h. Heat 600 ℃ , maintain 6h above. Following two conditions are to decompose furnace and system of intake air heater to fulfil roast sufficient requirement: When aperture of mould of tornado intake air heater fireproof and pouring when expecting the temperature that stands by silicon carapace a side achieves 100 ℃ , in above of successive and roast 24h. This practical and new-style the manhole that uses intake air heater of one class tornado, the glass that uses clean piece contact flue gas, already observed the phenomenon that is less than water and aeriform knot leakage, heat preservation 6h. Should notice especially moistureproof, moistureproof, moistureproof. If water is entered, or air is very humid, kiln brick is bibulous, can make pulverization of kiln brick generation or internal composition are destroyed. Kiln tile is in keep in storage, assemble and unassemble in the process, be not touched as far as possible, do not touch. If have damage, scrutiny wants when bricklaying, as far as possible need not, can leave snake in the grass otherwise.
Build by laying bricks or stones builds cement kiln firebrick law 1. The classification of bricklaying method and bricklaying method have a lot of kinds, it is very big to the quality influence of kiln brick, should come through following requirement normally assess: A. B of safety in operation. Correct, skilled installation C. The time D that bricklaying place needs. Of bricklaying equipment can handle a gender (flexibility) A. .A. . Depend on whether does bricklaying use gum, block method can be divided to work law of build by laying bricks or stones and way of wet build by laying bricks or stones. 1. Wet build by laying bricks or stones builds a method to basically be used at argillaceous brick, tall aluminous brick. When build by laying bricks or stones is built, the fireproof sex of kiln brick and fireproof mud must is close to quite, will run otherwise, kiln brick won't have wear away, but fireproof mud had been done not have, drop a brick easily so. The Tu Bu that fights fireclay wants even. 2. Dolomite brick and magnesian chromic brick basically are used at working way of build by laying bricks or stones, basically be the influence that is divided easily as a result of dolomite brick by water. According to bricky platoon cloth can divide law of build by laying bricks or stones of the annulus that it is a horizontal stroke and fore-and-aft crisscross build by laying bricks or stones to build a way again two kinds. 1. Application of law of fore-and-aft crisscross build by laying bricks or stones is not at present much, although nucleus of school of excel of its whole intensity, but mutual the connection between is relatively close, but, when occurrence problem, the destruction of a bit causes a larger area likely to destroy. 2. Law of horizontal annulus build by laying bricks or stones can divide the brick that is adjacent of two kinds of photographs to encircle a brick to be seamed again seam crisscross with the brick point-blank two kinds of block. When embarking on a journey with the brick, because bricky dimension deviation or bricklaying make the brick is seamed,cannot go up point-blank in, if brick is stagger, make easily damaged of the horn side the brick, cause strength thereby bad. Build means to differ according to build by laying bricks or stones, can divide it is facing coming back, fixed law, gooey law. 1. At present facing coming back applies to certain and small-sized kiln only, to large kiln, greater pressure exists when the kiln that prop up, kiln carapace is out of shape. Brickkiln bearing is cumbersome, carry the inconvenience that prop up, kiln way is older, kiln maintains susceptive force bigger, it is dangerous to easy happening, bricklaying rate is slower. 2. Stick receive, need not assist a tool, bricklaying rate is rapid. And felt way basically is more hardly possible assure kiln brick quality, cannot judge bricklaying the circle is firm. It is very unmanageable to brick and uneven place. Need to maintain the cleanness inside kiln first before brickkiln, can affect result of agglutinate sticking gum otherwise. 3. Securing law kiln carapace below half rounds is benefit build with artificial build by laying bricks or stones, going up half rounds is to use bricklaying machine to secure, do not need to turn when bricklaying kiln, the any place in kiln body is OK bricklaying, bricklaying engine is locomotive inside kiln very convenient. Brick rate is rapid, efficiency is tall, safety in operation. System of this furnace of kiln of #3 of second this factory uses dry, wet band. Law of build by laying bricks or stones of fixed, transverse annulus. The appearance of adobe and dimension should decide according to the diameter inside kiln, in same kind norms is accomplished to agree as far as possible inside kiln, size is proper. Too big, can make brick weight increases, carry build by laying bricks or stones to build hard, and drop a brick easily. Too small, can make the brick is seamed again overmuch, intensity drops, build to build by laying bricks or stones bring difficulty.
Fireproof irrigate build makings maintenance to be mixed in kiln after stopping kiln first, want to undertake checking to fireproof material, this examines the first time after can regarding line as calcination of high temperature of makings course first time examines, should comprehensive and meticulous, repair place to should ask strictly according to quality. In addition, line piece should regular examination, to certain key place should shorten examine periodic. If discover scaleboard falls off, answer to till change,be repaired in time, expose in order to prevent heat-insulation layer and body be affected by the heat. If discover steel cramp leakage, or gasket wears away 65% of original length, answer to repair line makings instantly. To line piece when undertaking repairing, want to use new cramp normally, increase cramp density appropriately (10%) , be in at the same time new old line piece between stay have expand seam.
High temperature resistant pouring on the dimension of the cramp in makings and positional cramp plane, cramp distributings to arrange the square system of 500mm at two edges, among them any cramp is on crural square foot, be located in another square heart at the same time, the cramp of two systems develops a range mutual and perpendicular. To different shape face, also want to consider according to cramp plane distributinging circumstance, but in producing a course, should consider the sale negative charge of lining cloth design and makings of the place line at the same time, the wiring direction that this may cause cramp and cloth cover are different, and of cramp span shorten. Outside there is special directive on the liner after dividing, cramp should solder with crust. The size of cramp head wants proper, cramp head should have leave certainly degree, prevent enoughly with retaining truly flake incidence, want to maintain certain altitude, height is insufficient, the surface is done not have pouring expect Shi Xianxian falls off. Cramp is exorbitant, bring about inchoate burn caustic, wear away, bring about fireproof function to be lost prematurely. Cramp head is due the covering layer of 25~30mm. Before mould, all cramp want besmear bitumen lacquer or twine plastic film, space appears after these material burn caustic, won't damage in order to assure the cramp that be heated expands pouring makings.
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