高强耐火泥浆在回转窑内衬中的应用

与其他固定式工业炉窑(如倒焰窑、隧道窑、石灰炉等)相比，回转窑内衬的使用寿命较短。究其原因，一是转动的窑体对内衬的机械作用给内衬造成一定损坏；二是在回转窑运转过程中，砖之间粘结不牢，造成内衬砖问相互作用而导致回转窑内衬使用寿命较短。其中后者是主要原因，本文在分析窑内衬     

隔热耐火复合砖在回转窑上的应用

锦西水泥厂３号窑是１９５８年建造的，规格为Φ３．７５m／３．１０m×７４m，属于窑尾带余热锅炉的干法中空窑，工艺落后，设备破旧，目前只处于勉强维持运营状态；窑的热效率很低，１９８８年标定２１．１５％，１９９６年标定２０．７５％；其中窑尾废气带走的热量损失最大，１９８８年标定为５５．２１％，１９９６年标定为５６．８５％；其次是窑筒体表面散失的热量，１９８８年标定为１６．１２％，１９９６年标定为１７．１０％。为减少筒体表面的散热损失，２０００年３月春季中检修，我们在３号窑镶砌隔热耐火复合砖２０m。经过１…     

延长篦冷机耐火内衬使用寿命的技术措施

我公司回转窑为φ2．8／2．4×40m预分解窑,日产熟料600吨,篦冷机为2．2×12．6m水平推动篦冷机,篦冷机内料层厚度控制在350mm,内衬全部采用粘土质耐火砖砌筑（见图1）。在生产中存在如下两个问题。     

水泥回转窑的机械应力对耐火材料内衬的影响

介绍了水泥回转窑受到的机械应力及其对内衬耐火材料的影响，说明了为减轻应力，提高回转窑内材耐火材料和机械部件的使用寿命而采取的措施。     

水泥预分解系统耐火内衬喷涂施工工艺的探讨

不定形耐火材料喷涂工艺与传统的使用定形的耐火材料砌筑工艺或浇注料浇注工艺相比,具有便于机械化施工、整体性能好的优点,对于较复杂的不规则的曲面内村尤其适用。本文介绍了洛阳水泥厂在新建日产1000吨预分解生产线上,在预热器、分解炉的锥体等部位的耐火内村采用喷涂施工工艺的情况。     

预分解窑用耐火衬料的发展动向与趋势(一)

就预分解窑用耐火材料与预分解窑技术发展之间的关系作一探讨,预分解窑技术的发展以及原燃料结构的改变,增加了回转窑,预热器等不动设备内耐火衬料的热应力和化学侵蚀,促进了耐火衬料的技术发展,本着此一发展趋势,提出我国预分解窑用耐火衬料的发展动向与趋势。     

回转窑内衬寿命的提高

研究并试验了煅烧镁石及其混合物的回转窑窑头热端内衬砌筑用铬镁砂作填充料的胶泥。利用方镁石－铬矿混合物并加入铝及磷铁制成铬镁砂。填充料可使90m回转窑及170m回转窑砌体的使用寿命分别提高1．5倍和0．5倍。     

回转窑轴线和斜度和简易测量方法

我厂有一Φ 2.4m/Φ 2.8m× 40m小型窑外分解窑,三段托轮支撑,由于窑体长期滚动,轮带、托轮都有不同程度的机械磨损,加之经常更换托轮,势必造成回转窑轴线和斜度的变化,所以有必要对窑体进行全面测量。我厂采用一种简易的测量方法,并以此作为窑体调整依据,对保证窑的平稳运行很有益处。测量方法如下。 1测量的准备 1)测量工具：经纬仪 (1台 )、水准仪 (2台 )、 50m钢卷尺 (1把 )、冲子 (1个 )、手锤 (1把 )、梯子 (1个 )、线锤 (2个 )。 　　2)方位的确定：站在窑头,面向窑尾,左手侧定为左侧,右手侧定为右侧。 　　3)水准仪高差…     

回转窑筒体直线度对耐火衬体的影响及应对措施

回转窑简体直线度关系到回转窑的长期安全运转.简体直线度存在偏差,会使支撑处简体和耐火衬体受到的轴向交变应力大大增加;还会增加回转窑的运转阻力,从而增加简体和耐火衬体的剪切力.在交变应力和剪切力的作用下,耐火衬体的稳定性受到威胁,严重时会造成耐火砖的挤碎、剪断、扭曲甚至掉砖.应对措施:监控轮带间隙;保持简体温度在圆周方向...     

Extended studies of degradation mechanisms in the refractory lining of a rotary kiln for iron ore pellet production

Changes, over a period of 8 years, in the chemical composition and morphology of deposit and lining materials in a production rotary kiln for iron ore pellet manufacture are described. The following have been studied: two types of refractory brick used as lining material; deposited chunk materials from the lining; the interaction zones between deposits and linings. Morphological changes at the deposit/lining interface, and the active chemical reactions, are established. Larger hematite grains in the deposit material (5–50 μm) primarily remain at the original deposit/lining interface. The remainder penetrates fissures, voids and brick joints, forms a laminar structure with corundum from the bricks, and migrates in grains in the lining material. Potassium penetrates more deeply into the bricks than hematite, resulting in the formation of kalsilite, leucite and potassium β-alumina, which contribute to degradation of the lining.     

Repairs of the lining of a rotary cement kiln

An object of this study is the development of a composition of monolithic refractory concrete and a method of ongoing repairs of the lining of cement kilns with its use. The operation of clinker-firing kilns and the processes occurring in firing the concrete are investigated and the process operations of hot repairs of the kiln lining with the monolithic refractory concrete are described. The physicotechnical properties of the concrete and the results of experimental industrial tests are also given. Translated from Ogneupory, No. 4, pp. 25 – 26, April, 1994.     

Periclase in chrome-magnesite lining of rotary kiln for firing cement clinker

Conclusions The periclase in chrome-magnesite containing iron oxides in its composition in the form of solid solutions secretes them during service in the sintering zone of rotary kilns, becomes lighter, recrystallizes, increasing in size through the intergrowth of several neighboring grains within the aggregates. The longer the refractory remains in the furnace, the more marked this effect.It is incorrect to transfer mechanically the metallurgical explanation of the brown fringe on the periclase aggregates and consider it to be a sign of their saturation with iron oxide.The recrystallization of the periclase is a positive factor furthering the service life of the refractory.     

活性石灰回转窑内衬复合砖的研制与应用

针对活性石灰回转窑在运行中存在内衬砖使用寿命短、隔热效果不好导致炉壳过热的问题,开展了回转窑内衬耐火材料的研究。通过破损调查和配方试验,研制了耐高温工作层与保温层一体成型的复合结构预制砖,使回转窑内衬的使用寿命提高到2年以上,降低炉壳表面温度50℃以上。     

耐火材料隧道窑窑车衬的传热行为

通过解－维傅立叶传热方程，建立了耐火材料隧道窑内车衬蓄热的表达式。并讨论了车衬蓄热与通过隧道窑的时间、车衬材质和烧成温度的关系。