Klinkers dedzināšana is an important link in cements ražošana, kas ietekmē the output, quality, dažādi patēriņš of cements klinkers, and cements ražošana izmaksas, un galu galā ietekmē ekonomiskos ieguvumus of the enterprise. The rotary kiln is the main thermal equipment for clinker burning. Tāpēc, it is nepieciešams analizēt un pētīt bojājums of ugunsizturīgs uguns ķieģeļi at auksts beigas of rotary kiln, so as to palīdzība us atrisināt šī problēma labi.
1 Analīze of the cēloņi of bojājumi to ugunsizturīgie ķieģeļi at aukstums gals of rotējošais ceplis
1.1 Spiedes spriegums bojājums Spiedes spriegums bojājumi galvenokārt attiecas uz deformācija of cilindrs dēļ to nepamatots dizains of the sprauga starp ritenis josta un pad, uzstādīšana kļūdas, etc., kas noved pie bojājumiem to uguns ķieģeļiem. Lielāks lielāks atstarpe 2c mazāk kontakts laukums starp ritenis josta un cilindrs, un mazāks stiegrojums efekts of ritenis josta on cilindrs, the lielāks spiediens stress, kas palielinās metināšana stress starp padu spilvent un cilindrs, rada plaisas, un pat saplīst the pad. At the same time, the ovality increase, izraisot the refireactor firebricks to burst.
1.2 Unreasonable setting of the retaining brick ring Due to the inertia of the rotary kiln during operation, the refractories bricks have a tendency to move downward. In order to prevent or reduce this tendency, retaining brick rings are often set at different positions in the kiln. From the perspective of force, the wheel belt is subject to the greatest force. If the brick retaining ring is set inside the wheel belt or close to it, the cylinder body is subjected to greater force and deformation. The brick retaining ring itself is often easily damaged, causing the weld to crack, which in turn damages the refractory bricks. In addition, the form of the brick retaining ring is also crucial. The earliest designed brick retaining ring was welded with angle steel, which had low strength, was easily damaged and deformed, and affected the stability of the bricks. Later, square steel brick retaining rings were widely used, and the strength was guaranteed, but the welding quality was often poor, which eventually caused bricks to fall off.
1.3 Neregulārs ugunsizturīgs uguns ķieģelis mūris In process of ugunsizturīgie ķieģeļi mūris, attiecīgie nacionālie standarti bija nebija ievēroti vai ne stingri īstenoti, rezultāts in dislokācija, slīpums, nevienmērīgs java locītavas, kāpšana, atvērums, dobums dislokācija, serpentīns locīšana, serpentīns locīšana, etc., or apstrādāts ķieģeļi bija nevienmērīgs, ar stūris piliens, plaisas, plaisas, trūkstošas malas, etc. , vai kad bloķēšana šuves, savienojums tērauds plāksne bija pārāk biezs, iespīlēts pārāk cieši vai pārāk brīvi, utt.
1.4 Process darbība sistēma ir nav strikts. Galvenais iemesls ir tas apkure un dzesēšana ātrums ir pārāk ātrs laikā krāsns atvēršana un dzesēšana process, kas izraisa ķieģeļus to būt bojāts ar pārmērīgs termisks stress (ātra dzesēšana un apkure).
2 Pretpasākumi
2.1 Reduce compressive stress damage Select a suitable gap between the wheel belt and the pad. For the cold end of the rotary kiln, the gap should be 3~4mm. Too large or too small will easily damage the refractory bricks. It is best to choose an adjustable pad to ensure the best gap. The thickness of the cylinder under the wheel belt is moderate and the structure is proper. Too thin, it is easy to deform, too thick, the contact area between the wheel belt and the cylinder is reduced, the local pressure is increased and the wear is aggravated. The relative thickness δ/D under the wheel belt (δ is the thickness of the cylinder under the wheel belt, D is the diameter of the cylinder) is generally 0.012~0.015. The upper limit is taken for large kiln diameter and the lower limit is taken for small kiln diameter. The wheel belt should have sufficient rigidity. Small reaction force, not thin cylinder thickness, and small (very small) gap are all conducive to reducing cylinder deformation. However, if the rigidity of the wheel belt is too small, the kiln body will still be deformed, and the cycle of the refractory bricks will be very short.
2.2 Uzstādījums of the paturēšana ķieģelis gredzens vajadzētu būtu zinātnisks un saprātīgs. The keeping brick ring should be set 2.0m away from the center line of the wheel belt to prevent the elipsveida spēka ģenerēts by the elipsveida process no bojāts it. It is best to use square steel for the keeping brick ring, and chamfer the parts to be metināts, kas var ne tikai nodrošināt the metināšana kvalitāte, bet arī atvieglo inkrustācija of ugunsizturīgie ķieģeļi ķieģeļi. Aizturēšana ķieģelis gredzens nevar būt komplekts at apkārtmērs metinājums of cilindrs lai izvairītos bojājums un celms to cilindrs. Ugunsizturīgie ķieģeļi aizsardzība aizsardzība paturēšana ķieģelis gredzens vajadzētu inkrustēts zem paturēšana ķieģelis gredzens lai izvairītos vai izvairītos bojājums � īpašas formas ķieģeļi.
2.3 Bricklaying should be standardized and strictly follow the national standards. The refractory bricks should be close to the kiln body, the bricks should be close to each other, the brick joints should be straight, the intersection should be accurate, the brick joints should be firm, not misaligned, and not sagging or falling. The circumferential seams must be aligned, not climbing, not deviating, and avoiding misalignment or serpentine bending. The lock seam bricks must be complete and constructed strictly according to the lock seam regulations. The steel plate used for locking seams should preferably not exceed 2mm, and must be flat, without curling, twisting, or burrs. 2.4 Strict kiln drying and cooling system The kiln drying system is to carry out kiln drying operations according to a certain heating curve. Special attention should be paid to wet masonry to ensure that free moisture is discharged to prevent the explosion of refractories bricks due to excessive heating, and the heating rate should be strictly controlled; the cooling kiln process must ensure a certain insulation time, and the insulation (natural cooling) should be at least 8 hours after the kiln is stopped after unloading. For rotary kilns using insulation materials, the insulation time should be appropriately extended. At the beginning of the forced cooling stage, the air door should be closed and then gradually opened.
