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外文翻譯(中英文)懸浮預熱技術-其他專業.doc

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外文翻譯(中英文)懸浮預熱技術-其他專業.doc

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 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 preheater kiln Suspension preheater kiln characteristic is in after a short length of rotary kiln installed suspension preheater, make originally in the states with accumulation plume material preheating and part of carbonate decomposing process, moved to suspension preheater through suspension state within a state of suspension, so the raw with heat flow powder, fully contact with the gas 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 advantages. 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 transfer 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 preheated 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 these 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 separation. 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 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; Proper 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 pipe, and can maximize prevent lower the 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 lower 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 canister 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 differences 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 preheating 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 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 dusty 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 motion 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 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 1, leak air of influence Whirlwind tube as cement suspension preheater decomposition process important equipment, its air leakage, whether in the air leakage or air leakage, is harmful. Preheat system directly affects its outside air leakage and increase efficiency, exhaust fan power consumption, and feed tube place in air leakage makes whirlwind canister separation efficiency sharply reduced the fly ash, system, causing an indirect influence ratio increases the preheater system thermal efficiency. In the actual production process, preheater system outside air leakage are easy to spot. To strengthen management, improve operation personnel sense of responsibility, outside air leakage can be controlled. But the next feed tube place within the air leakage, often with operators, experience judgment will not be discovered. Currently used flap valve unloader device, in order to prevent and smooth unloading, often allows certain by turning the volume in leak into the next makings tube, so adopt flap valve unloading may not fundamentally eliminate air leakage within. Research on a whirlwind tube leakage separation efficiency, looking for the influence of the effective measures to reduce the harm of fly ash, reduce the quantity and improve efficiency of the preheater kiln system has important significance. Next feed tube place from air leakage points whirlwind canister unloading mouth closer, air leakage caused a whirlwind of mono reduction separation efficiency is larger. In the actual production process, the flap valve unloading cannot completely prevent leakage within. Appropriate extension with a whirlwind flap valve installation position cartridge unloading mouth, can increase the distance between the whirlwind canister separation efficiency. 2, the influence of whirlwind tube import wind speed Different wind conditions, with imported whirlwind tube import wind speed increase, next makings pipe leakage caused a whirlwind tube in reduction of separation efficiency increase, if keep constant, the air leakage of air leakage caused by imported wind speed reduction and separation efficiency whirlwind canister less effect. 3 and solid gas ratio influence Solid/gas ratio under different in feed tube and air leakage caused a whirlwind canister reduction separation efficiency is different also with solid/gas ratio increases, down feed tube leakage caused a whirlwind tube in reduction of separation efficiency increases at the same time. But, for a given leakage rate, with solid/gas ratio increases, the difference in value and separation efficiency gradually narrowing. The greater the solid/gas ratio, feed tube place air leakage caused a whirlwind tube material unloading mouth place more serious phenomenon also shed. This may be solid/gas ratio in the next feed tube and air leakage caused a whirlwind canister the separation efficiency of the reduction of reason. 4, a whirlwind canister influence of the structure of 2 Whirlwind cylinder is generally rectangles 2 structure, a new type of low-pressure loss due to the structure type whirlwind tube changes and geometrical shape of 2 also change, some use five-sides, some use diamond, aims to guide into a whirlwind of mono under gas-solid flow deflection movement, reduce a whirlwind canister resistance. Whirlwind tube import way generally has two kinds, namely import airflow tillu tangent says straight with cylinder type; Airflow around the tangent says with spiral type cylinder. Due to import can make spiral into a whirlwind of cylinder, air passage gradually narrowed to help to reduce the distance of inner particles move, the distance to increase airflow exhaust, avoid short circuit, can improve the separation efficiency. But also has a deal with pressure loss of air, the advantages of small, reason often used. 5, tube insertion depth The increase of steel-flue insert depth, the resistance coefficient and separation efficiency is the increase of different processes. Insert depth, and imported high tube ratio of s/a o. 482-0.612 range, low resistance coefficient little change, and separation efficiency increases slightly, so sure of separation efficiency should be emphasized the intermediate level resistance reduction whirlwind cylinder should be in s/a 0.612 or so, and had better not lt; Separation efficiency 0.482 too much, also dont reduce of gt; 0.816 resistance coefficient increases too big; But the separation efficiency emphasized at the next higher level shall be s/a whirlwind tube in 1.02 left and right sides, because when s/a When 1.02 separation efficiency, reduce more when s/a 1.02 separation efficiency increase when. 6 and the influence of tube diameter With the expansion of inner cylinder diameters, the resistance coefficient and separation efficiency of different diameter reduced, including D d/a cylinder; 2/3, drag coefficient falling fast, when d/D 2/3, drag coefficient reducing slowly. For separation efficiency, it D tube diameter d /; O. when high separation efficiency and six little change, when d/D O. 6, separating efficiency decreases rapidly. So guarantee of separation efficiency should be emphasized the intermediate level resistance reduction whirlwind in the cylinder tube diameter size, d/d can be in 2/3 or so, and had better not gt; 2/3, otherwise the resistance coefficient reducing much bigger; the separation efficiency and reduce Also dont lt; 0.6, or resistance coefficient increases too big; But the separation efficiency emphasized at the next higher level within the whirlwind tube diameter size, d/reduction should be lt; d 0.6, because when d/D 0.6 separation efficiency reduce when more. Not quite, but the resistance coefficient increases to a certain extent. 7, a whirlwind tube high aspect ratio Along with the increase of whirlwind canister height, the resistance coefficient and separation efficiency of different reduce respectively, it especially with increase in when a whirlwind tube diameter ratio H/high D The performance 2.282 more apparent, but when H/D 2.282, drag coefficient and separation efficiency as a whirlwind canister height respectively increased decreases and increased slowly. So consider the height and preheater tower under the premise of an investment cost, best can guarantee a whirlwind tube diameter ratio around in high 2.282, because too low, and separation efficiency reduce resistance coefficient increases. But due to high separation efficiency and resistance coefficient increases and reduce respectively, and few whirlwind canister height and equipment costs have increased to a certain extent. Five, the normal production inspection and maintenance of mainly include the following aspects 1 a normal production process of the electric dust removal valve condition; 2 system seal condition; 3 decomposition furnace, a whirlwind tube and connecting pipe shell without exception such as the night observing shell domestic village peel off and then red; 4 the whirlwind tube blow plugging device might be flexible motion electromagnetic valve, blow plugging pneumatic meets the standards; 5 artificially block clearer tools are ready; 6 system temperature sensor, pressure measuring device is stable and reliable; 7 decomposition furnace burner without exception combustion; 8 system safety protective measures for completeness. Six, stop kiln maintenance preheater and decomposition furnace ex

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