1 machinery damages
In roll of rotary kiln kiln, the brick that is located in support roller place suffers extruding, the brick that is located in coping of canister of rotary kiln kiln suffers kiln tare quantity and self-prossessed brought drawing. What the brick gets inside kiln is to press, pull, twist, shears integrated and mechanical stress. The roll of kiln, cylindrical shell ovality, cylindrical shell of the extruding between brick and brick, twist, kiln is reached to be out of shape between line brick and cylindrical shell, can produce mechanical stress between bricky line. When cylindrical shell and annulus take space bigger, make ovality of kiln cylindrical shell increases, line brick suffers hand in change stress increases, annulus the mechanical stress that takes place place to suffer is most severe. My factory ever produced kiln cylindrical shell to bend after updating a brick, acuteness vibration adds kiln line from time to tome local overheat, cause body to be out of shape extruding liner, again support roller adjusts take time longer, before be apart from kiln 6m rectifies place of 3 date annulus belt to produce red kiln, firebrick falls off in large area of a place, mend by replacing a damaged part, support roller adjusts normal kiln put oneself in another's position no longer oscillatory, red kiln phenomenon did not produce again after this take second place.
2 urgent cold urgent heat
Alkalescent coefficient of expansion is big, in warm up immense thermal stress arises in the process, because this is carbonadoing warm up when kiln,want slow, make kiln cylindrical shell expands of compensatory brick expand play kiln body compensates action. This is the crucial seat that uses alkalescent brick. But accept 10~20 hard in actual production of a few hours carbonado kiln time, high temperature fan is opened to undertake directly when discovering a problem fast cool kiln. Cooling and junior kiln can discover the magnesium that does not have kiln skin is chromic bricky happening flakes attaint, mo Zhuanquan of 1 680 silicon ministry happening surface flakes, rupture place surface is solid, some fractional and apparent hang up are on the brick. Firing the magnesian chromic brick of the belt rushed to warm up as a result of kiln skin delay fluctuant, damage is minor. After the overhaul to grab crop, the demand is sudden the damage that cold kiln causes a brick necessarily, lift for 2 body temperature bury issued inducement, firebrick accident is frequent.
The change of 3 former fuel
On the kiln that stabilizes in operating mode only, conglutinate of the ability on bricky line and keep solid kiln skin, the life of kiln line just is able to assure, and the stability of hot industry system asks again the stability of former fuel, because the supply of coal is difficult, the ash content of coal from change between 32%~45% , at first to get used to coal of high ash content, into kiln raw material saturation is compared tall, but change of coal ash content is too frequent, do not have coal leveling storage yard again, make kiln gives birth to makings and coal ash to divide very difficult correspondence, produce very big effect to the state inside kiln. Cast after the overhaul makings, firm kiln skin depends on 20m controlling, magnesian chromic brick is complete under kiln skin. But the wave motion that pledges as a result of coal, pi Weiduan sticks kiln often to hang and fall off, join closely with the brick when the kiln skin that conglutinate forms mechanical anchor to originally on the brick falls off, layer of implicative brick body flakes together, make bricky body attenuates, kiln skin shortens control to 16m, make partial magnesium chromic brick loses kiln skin protection, kiln skin extreme because coal ash sank, kiln skin is thicker, the raw material herein with fluid photograph less quantity erodes abrasion magnesia brick. Firing take because chromic brick of direct union magnesium is high temperature resistant,using chromic brick of direct union magnesium basically is, hang kiln skin easily, but because content of the silicate inside the brick is extremely low (0.5%~2.5%SiO2) , stone of the Fang Mei inside the brick, pointed spar basically shows direct couple, silicate photograph is isolated in existence clearance, be surrounded by grain of square magnesian stone, pointed spar, fight high temperature capability to rise, but microstructure tenacity is very poor, make thermal shock stability of the brick, fight alkaline corrode ability and fight oxidation and ability of reducing atmosphere change to have quite reduce. Special leaving stop use on more frequent kiln, life shortens greatly, without kiln skin the magnesian chromic brick as protective screen, exterior temperature follows kiln condition change, numerous replace of kiln skin frequency, the magnesian chromic brick with meeting bilge bigger coefficient produces hot exhaustion, chemistry is eroded, the infiltration of fluid photograph alkaline salt makes bricky structure exasperate, reduce heatproof and fatigue performance, make here chromic brick of magnesium of a few annulus is in body temperature to lift ceaselessly, final red kiln, to fill the skin that hang kiln enforces to form kiln skin on firebrick in water of body surface gush, but the be heated of kiln expands to compensate action to disappear to stress of bricky line internal pressure, go against bricky line life, together with, bricky system is too small cannot form stable kiln skin, for many times red kiln. Take kiln mend by replacing a damaged part only, the smallest part has the brick only 40cm left and right sides. The magnesian chromic brick that manages 2m office in kiln mouth also has appeared similar case. Be born into kiln makings is full close than stabilizing moderate, but coal ash content is bigger, make firing belt form skin of kiln of ’ of ‘ low temperature, loose and poriferous not firm, reduce suddenly when coal ash content, and gush coal canal walks orgnaization breakdown, gush coal mouth and kiln mouth are smooth neat, cannot send kiln inside, make kiln mouth temperature elevatory, gasket of rotary kiln kiln falls off, skin of kiln of ” of “ low temperature is not stable, add clinker dust to erode, erode, and the extruding of a few meters of bricks inside kiln, the special shaped brick that makes 2m is in produces disintegrate, drop brick, red kiln.
4: Construction build by laying bricks or stones builds technology
The technology that builds firebrick time in build by laying bricks or stones of rotary kiln liner is coarser, did not accomplish ash to seam control, insert seam armor plate to enchase not firm, after waiting for a phenomenon, section of firebrick existence crackle still is used. Wait for a problem
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