Cement kiln firebrick lining life wears away element 1. Thermal stress is in process of cement grog to calcine, as a result of the influence of kiln makings and flue gas, it is different that the temperature in kiln system distributings. 2. The bases that chemistry erodes the raw material that is used at grog of to calcine cement is Cao, siO2, al2O3, fe2O3, minor part is MgO, k2O, na2O, SO3, cl2 and other oxide and microelement compound. 3. Mechanical stress is in process of cement grog production, between line bricklaying and line bricklaying, between line bricklaying and kiln makings, between line bricklaying and metallic canister, body of line build by laying bricks or stones and heat expand the interaction between metallic spare parts can produce mechanical stress, cause line bricklaying damage thereby. 4. All sorts of stress that integrated function produces as a result of clinker to calcine are dynamic, accordingly the working requirement of departmental cent inside kiln and reaction mechanism are different, because this is opposite,the requirement of fireproof material also differs. Cement decomposes kiln system beforehand the key that the choice cement kiln of fireproof material uses fireproof data is facilities of cement grog production uses up material. In process of cement grog production, the function of fireproof material reachs his to use safeguard, the movement of the crop that matters to clinker directly, quality and kiln is led, especially the choice of fireproof material, the choice of fireproof material is decision kiln furnace the front row of service life crucial link. The choice of 1 fireproof material because rotary kiln each place and the manufacturing condition that secure facility are different, those who need to get force case according to each place is different, what logical choice uses data. What rotary kiln of 1.1 rotary kiln uses fireproof material to basically have the following kinds: Because thermal stress of cooling zone front is great, kiln mouth makes cylindrical shell is out of shape easily, build by laying bricks or stones builds line brick difficulty. The special low cement that uses tall Al2O3 content commonly is fireproof and pouring makings, can counteractive thermochemistry is corroded, thermomechanical stress and wearability. These breed include corundum, corundum carborundum of Molaishi, corundum, andalusite is pouring makings. Cooling zone back end (next intermediate zone) Lv of take an examination is high temperature resistant chemical, thermomechanical the alkalescent brick that stress can hang on kiln skin, basically include aluminium of the silica brick inside the kiln with combustion longer blaze, magnesian iron the series such as pointed spar brick, can consider to use the brick of special type tall aluminium of tall Al2O3 content. High temperature firing zone (firing zone) with melt firing zone (on intermediate zone front) should be the alkalescent brick that hangs kiln easily. The product includes magnesian Tie Jianjing brick of pointed spar of magnalium of spar of stone, magnesian calcic needle, the sources of energy, magnesian zirconium, dolomite brick. Kiln skin does not stabilize bare even brick on transfer take back end appropriate to use pointed spar magnesia brick. If sulfur is alkaline,erode serious, can choose fight flake tall aluminous brick (Al2O3 is 75% ) or series silica brick. (alumina > 65% ) . Decompose an area to use fight flake brick (Al2O3 is 70% ) or series silica brick (Al2O3>60% ) . As a result of hind difficulty of design of style of kiln mouth brick is great, use special type commonly tall aluminium is fireproof and pouring makings, basically be corundum Jimolaishi and Molaishi are pouring makings. If need to design line brick truly, can choose fight flake brick of tall aluminous brick, series silica mould pressing. 1.2 fixed equipment to reduce cylindrical shell medicinal powder hot, the liner of fixed equipment uses siliceous calcareous plate to serve as thermal insulation, tall aluminous liner regards the job as the layer. When the line system that designs fixed equipment, to simplify the design of bricky body, make, store carry, construction, consider the firm sex of line system, the line system appropriate of straight wall of abnormity place and roofing uses low cement fireproof and pouring makings. Flexure uses line brick. (1) large wicket is covered reach cooling machine to enter the mouth build by laying bricks or stones of this place line is straight wall, working layer temperature is average under 1100 ℃ , from the point of the element such as the consistence of line system, appropriate chooses low cement, high strenth, tall aluminium fireproof and pouring makings, basically be tall aluminium, Molaishi pouring makings. If need preparation line brick, can use fight flake tall aluminous brick reachs series silica brick (brick of carborundum macerate tall aluminium) or brick of special type tall aluminium. (2) intake air heater decomposes furnace system and tertiary air to be in charge of prep above of hot side temperature the build by laying bricks or stones of circular arc line of the place of working layer high temperature of 1100 ℃ can be chosen fight flake silica brick of tall aluminous brick, series (SiC invades brick of series tall aluminium) , brick of special type tall aluminium, alkali resistance brick, model the tall aluminium that chooses function close is fireproof and pouring makings, basically have the skin that prevent a knot pouring makings, Molaishi is pouring makings, tall aluminium is pouring layer of makings, spray, temperature of afore-mentioned line system working face under 1100 ℃ , choose a series of alkali resistance bricks so or alkali resistance is pouring makings. (3) burner this place and kiln mouth are identical, bearing the thermal stress of high temperature, serious thermochemistry is eroded and mechanical stress. Use low cement commonly tall aluminous carborundum is fireproof and pouring tall aluminium of makings or special type is fireproof and pouring makings and Molaishi. Pouring makings. (4) temperature of surface of layer of job of short wall and sidewall of other part condenser, roof is more than condenser parietal the place of 1000 ℃ , use tall aluminium, Molaishi commonly fireproof and pouring makings. Place uses tall aluminium commonly under 1000 ℃ fireproof and pouring makings, side wall bottom and clinker contact place use steel fiber to increase commonly, tall wear-resisting is pouring makings or carborundum are pouring makings. Form a complete set of 2 fireproof material is in the manufacturing process that decomposes kiln beforehand, because dimensions of raw material, equipment and manufacturing pilot are different, stress of the thermal stress of each part lining, thermochemistry and thermomechanical stress is abhorrent. Use a kind very hard or a few kinds of fireproof material serve as one a complete set of. Same and fireproof material is used in the different position of diverse product line, different amount. Also can use a variety of fireproof data in same position, can find proper material through using. In addition, if same data is used in same part, criterion the change as a result of former fuel function, the attaint of the effect that uses every time and fireproof material is different. To make fireproof material effective, good method is to pass practice to be optimized stage by stage. But when designing new cave dwelling, but basis " housing materials occupation standard " (JC/T2196-2013) " cement rotary kiln is fireproof material uses a provision " medium configuration suggests to undertake choosing. Explain, regard form a complete set as equipment, need produces analysis of stress of system of analysis of analysis of line operating mode, technological equipment function, line, manufactory place to offer the function of the product and use condition to decide through opposite, undertake adjustment, change and be optimized and improve of the condition as the job. 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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