1、1 中文 4064 字 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 temp
2、erature 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 ma
3、inly 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
4、 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 decom
5、position 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 decompositio
6、n 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
7、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 preheater kiln Suspension preheater kiln characteristic is in after a short length of rotary k
8、iln installed suspension preheater, make originally in the states with accumulation plume material preheating and part of carbonate decomposing process, moved to suspension 2 preheater through suspension state within a state of suspension, so the raw with heat flow powder, fully contact with the gas
9、 and solid phase interface big, heat transfer speed, high efficiency, improve the kiln production ability, reduce the heat consumption of clinker burn. At the same time it still has few movement part, accessory equipment, maintenance is simpler, small area is lesser, investment costs lower advantage
10、s. Three, suspension preheater the composition and function Suspension preheater mainly cyclone preheater and made tube preheater two kinds. Tube preheater has now made tends to eliminated. Pre by cyclone preheater decompose kiln as preheating unit equipment. Constitute a cyclone preheater heat tran
11、sfer unit equipment is mainly a whirlwind tube and tube at various levels between whirlwind of connecting pipeline (also called heat pipe). The main function of suspension preheater is fully utilize rotary kiln and the drain of decomposing furnace hot airflow which heat enthalpy heat raw, make prehe
12、ated and part, and then into carbonate decomposition of decomposing furnace or rotary kiln, continue the heating decomposition burn complete clinker task. So it must have contentious, solid two-phase can fully scattered uniform, rapid heat transfer, efficient separation and three functions. Only the
13、se three functions, and both of trying to make highlyeffective, can maximize thermal for whole kiln system, high quality, high efficiency, low consumption and stable production create conditions. Cyclone preheater functions to dispersing materials in hot airflow, uniform, gas-solid in heat and separ
14、ation. Its performance quality mainly displays in whether has the high thermal efficiency, low, separation of resistance and good sealing performance to reduce internal and external air leakage, etc. Cyclone preheater is by a whirlwind tube and upper and lower two level a whirlwind cylinder composed
15、 the connections between pipeline. Part of the whirlwind canister ontology cylinder, the cone, a pipeline, export pipeline, imported material pipe inner cylinder and etc. Connecting pipe upside and superior a whirlwind tube inlet piping, lower and lower a whirlwind tube outlet piping connections； Pr
16、oper position superior a whirlwind among the next feed tube and tube the connection； Whirlwind tube feeding at a higher level under proper positions of the pipe, air valve installed a locked not only keep the role is separated from the superior a whirlwind canister to expedite raw through the heat p
17、ipe, and can maximize prevent lower the 3 heat whirlwind canister out under short-circuit feed tube flows into superior a whirlwind tube, cause has been separation of secondary float in the sky, reduce powder raw superiors separation efficiency； whirlwind tube Whirlwind tube in superior under the lo
18、wer feed tube with heat pipe joint and also has a feeder, the purpose is to make the tube down superior a whirlwind into heat pipe homogenizing powder, because gravity rushed in and splash rise, make the feeder can rapidly dispersing, powder raw edgeunder at a lower level of heat flow whirlwind cani
19、ster out, improve thermal among. Traced back, as the cyclone preheater whirlwind of the main part in general cone, is the whirlwind dust collector based on reference over the development. Both have in common is to keep low-pressure loss status has higher gas-solid separation efficiency. But differen
20、ces lies in, cyclone dust collector dont have heat transfer function, and should have the highest possible gas-solid separation function； And for cyclone preheater whirlwind of main equipment cartridge speaking, because it is by multilevel heat transfer units, material is composed by a multi-stage p
21、reheating unit, so just keep uploaded heating gas-solid separation of the given the heat transfer efficiency and must complete a due role that task. So it in cyclone preheater system, depending on the place of different preheater level, have different gas-solid separation efficiency targets, and its
22、 itself structure also has difference. So the dusty airflow finally get separated. The gas and dust in different physical characteristics, main show is in a gaseous materials, quality is lesser, easy deformation； Another is larger, solid material, quality is out of shape not easily. So, when the dus
23、ty air role to by centrifugal force whirlwind tube wall enrichment, it was a gas centrifugal and thus dust in mechanics have conditions will air extrusion, and concentrated in the hollow, and airflow is attached with a layer of dust in. When the dusty airflow movement, dust, a force for air, the mot
24、ion of local change airflow； Meanwhile airflow a reaction which to dust to dust, this is the resistance of the air. The resistance theoretical analysis and scientific experiments that affect both whirlwind cone fluid resistance and separation efficiency basically has two big factors, a whirlwind of
25、geometric structure is cartridge, the second is a fluid itself physical properties. Because as used in cement industry suspension preheater whirlwind tube, its handling of airflow dusty defined roughly physical properties. Four, the influence of thermal efficiency and the dedusting efficiency factors
