【作者】 赵峰；

【导师】 徐德龙； 陈延信；

【作者基本信息】 西安建筑科技大学 ， 材料学， 2006， 硕士

【摘要】 为了进一步降低预热器系统的热耗,提高预热器系统的热效率,西安建筑科技大学粉体工程研究所一直致力于高固气比预热预分解系统的研究与开发,本文正是基于这一点而着手研究开发三系列高固气比旋风预热器系统。 本文通过旋风预热器导流板减阻试验、提升管阻力损失试验以及三系列高固气比旋风预热器系统冷态模型试验,分析了四种入口导流板对旋风器性能影响的优劣及其各自的适用范围;考察了提升管阻力损失的构成,研究了入料点的变化对提升管和旋风器阻力损失的影响;测试了三系列高固气比一级旋风预热器系统系列之间的风量分配、系统总分离效率,分析了系统阻力的构成。 结果表明:四种不同形式的入口导流板均起到了不同程度的降阻作用。1#导流板空载下的减阻幅度在13%左右,而随着固气比的增大,减阻效果很快恶化,但其可以保持较高的分离效率;2#导流板在降低阻力的同时并没有降低分离效率,但随着固气比的增加,其降阻幅度有一定减弱;3#、4#导流板减阻效果相当,减阻幅度较大,可达40%,但分离效率均相对较低,其中4#的分离效率要优于3#。 低入料点提升管中,空载态时弯管段的阻力损失最大,而加料后加速段的阻力损失在整个提升管的阻力损失中所占比例最大(超过60%),起着决定性的作用;在入料点提升到弯管处后,提升管部分的阻力损失大幅度降低,降低幅度达60%以上;提高入料点对对应的旋风预热器压降并没有造成不利的影响,反而旋风预热器的阻力损失会略有降低。 计算结果表明:当系统固气比为1.0时,一级单系列预热器热效率为40.1%,双系列为44.9%,三系列为46.9%,得出三系列高固气比预热器系统在提高热效率方面具有优势。 在三系列高固气比旋风预热器系统中,旋风筒的阻力损失占最主要的部分,在较大旋风筒入口风速(21m/s、24m/s)和较高固气比(单体超过2.0)下,旋风筒压降不再随着固气比的增大而减小,而是有所上升;提升管中弯管处的阻力损失也比较大,由于系统中各部位的阻力损失相互影响,使其呈现了不同于单体研更多还原

【Abstract】 For further decreasing the calorific consumption and improving thermal efficiency, the research of preheater system and development for the preheating-precalcining system with high solid-gas ratio (HSGR) have been conducted for several years by Institute of Powder Engineering in Xi’an University of Architecture & Technology. Based on this point, the paper presents the research works and results of a kind of tri-series cyclone preheater with HSGR.Through the experiments on lowering the pressure drop of cyclone preheater, the pressure drop of the lifter tube and the cold model of tri-series cyclone preheater with HSGR, effects of four types of guide vanes which are fitted in the cyclone inlet wall on the cyclone separator performance have been analyzed;the construction of the pressure drop of the lifter tube and the influences of changing materials feeding point on the pressure drop of the lifter tube and cyclone separator have been investigated;the designed model of tri-series one stage cyclone preheater with HSGR has been tested to evaluate the construction of system pressure drop, gas distribution and the total collection efficiency.The results show that all of the four different guide vanes reduce the cyclone pressure drop and also influence the collection efficiency in different degrees. 1# inlet vane causes a pressure drop reduction about 13% under pure gas flow condition;effects of pressure drop reduction deteriorate with the increasing solid-gas ratio. But 1# has high collection efficiency. Of all the guide vanes, the effect of 2# on pressure drop reduction is in the second place and has no reduction in collection efficiency;3#, 4# guide vanes cause a higher pressure drop reduction up to 40%, and a lower collection efficiency than the one without an inlet vane, but cyclone with 4# inlet vane has a better collectionefficiency than the one with 3#.The pressure drop over the whole lifter tube was separately measured in there sections: section of solids accelerating upwards, section of solids uniformly moving and the lifter bend. Measurement indicates that most pressure drop (over 60%) existed in the acceleration section. Shift of the feeding point of raw meal from the lower part of the lifter to the bend results in a decrease of 60% in the whole lifter pressure drop, and also decreases the pressure drop of the cyclone.The computed results indicate that when the system solid-gas ratio is 1.0, thermal efficiency for single series preheater is 40.1%, 44.9% for double series and 46.9% for tri-series. Based on the results, it is easy to know that the tri-series preheater with HSGR is beneficial for improving thermal efficiency.In the tri-series cyclone preheater with HSGR, the pressure drop of cyclone makes up the main part of system pressure drop. With greater cyclone inlet velocity(21 m^ 24m/s) and higher solid-gas ratio(over 2.0),cyclone pressure drop keeps increasing instead of decreasing;the pressure drop of elbow is also higher, it influences with the pressure drop of other parts in the system, and there will be a little down;the pressure drop of the outlet tube cannot be disregarded either, it is meaningful to eliminate the pressure drop of this part. Under different gas velocity, system collection efficiency keeps over 85%.Gas running distribution for the tri-series keeps relatively balance, and the departure is less than ± 4% for each series.In a word, the experiment model of the tri-series cyclone preheater with HSGR has a stable structure and function and it provides a basis for the further studies.更多还原