毕业论文外文翻-悬浮预热技术.doc

suspended preheatingtechnique A, suspended preheatingtechnique superiority Traditional dry process rotary kiln production of raw cement clinker, burn, decomposed and preheat the plume are completed in the process. Rotary kiln as burning into equipment, because it can provide section temperature distribution was homogeneous temperature field, and can ensure material at high temperatures have enough retention time, still can meet the requirements. But as heat and mass transfer equipment is not ideal, to need to heat larger preheating, decomposing process is very not adapt. This is mainly due to the accumulation in kiln stove bottom of materials, from material layer surface through air, air with material contact area small, heat transfer efficiency low be caused by. Meanwhile, the stove decomposing zone in feeding powder layered accumulation state, material layer to the internal decomposition out carbon dioxide small area, the spread of airflow resistance, slow, and material layer internal granules are carbon dioxide gas membrane packages, carbon dioxide, differential pressure decomposition temperatures the demand is high, it has increased the difficulty of carbonate decomposition and reduce the decomposition rate. Suspension preheater technical breakthroughs, fundamentally changed materials heat transfer condition, preheat the process of material accumulation state will the stove to warm-up and decomposing process, were moved to suspension preheater and decomposition furnace inner state of suspension. Due to suspension in heat flow of materials, and airflow greatly increased the contact area, so the heat transfer speed fast, heat transfer efficiency is very high. Meanwhile, raw fuel at powder and suspended configuration, mixing, fuel burning hot timely to raw material and make the rapid decomposition. Thus, due to rapid, heat transfer, mass transfer substantially improve the production efficiency and thermal efficiency. Second, the characteristics of suspension preh