外循环式高固气比悬浮炉压力损失和循环率的试验研究
发布时间:2018-05-19 05:58
本文选题:高固气比 + 阻力损失 ; 参考:《西安建筑科技大学》2015年硕士论文
【摘要】:外循环式高固气比分解炉利用离心分离的原理选择性地让粗颗粒物料作炉外循环。工程实践表明其具有热稳定性好,单位容积热负荷率高,分解效率高等优势,同时对降低有害气体的排放有明显的效果。为进一步丰富该炉型的基础数据,优化结构和操作参数,本论文以粉体工程研究所研发的基础炉型结构为基础,通过冷态模拟试验,考察外循环式高气比分解炉系统中三次风管入口风速和分离器底部结构参数与系统阻力损失、外循环率、分离特性之间的对应数量关系,为后续工业装置的优化设计提供基础参数。研究得到以下结论:(1)随着分解炉截面风速的增大,外循环系统和各单体结构的阻力损失逐渐增大。粗分离器集料下锥体结构参数变化对外循环系统的阻力损失影响显著。粗分离器集料轴心位置变化对阻力损失的影响远大于锥体面积变化产生的影响。空载条件下,OS1型锥体结构对应的阻力损失最小。负荷状态下,DS1型锥体结构对应的阻力特性最优。当分解炉截面风速相同,随着三次风速的增加,分解炉上行管阻力损失增加。在分解炉截面风速=5.0m/s~8.0m/s范围内,带料负荷(z=0.5)比空载运行时的外循环系统阻力损失增加约3.0%~12.0%。(2)对高效分离器,随着分解炉截面风速增大,分离效率ηg先增大,后有所降低。在风速=6m/s时分离效率ηg最高。粗分离器下锥体结构参数的改变对外循环系统的循环率有较大影响,粗分离器的总分离效率变化趋势为随us增大先减小,再增大。七种锥体结构参数中,IS1型结构对应的外循环率最高,其余按CS3型、CS1型、CS2型、DS1型、USI型、OS1型结构依次外循环率降低。(3)对同一粗分离器锥体结构,当=5~6m/s,=26~28m/s时,或当=7~8m/s,=24m/s时,同一颗粒粒径dp的分级效率较高;粗分离器下锥体结构参数变化对分级效率影响很大。物料颗粒粒径在dp40μm和dp55μm时,分级效率变化幅度很小,即对风速us变化不敏感,颗粒粒径在40μmdp55μm范围内,分级分离效率变化幅度较大,即风速us对分级分离效率影响明显,在=6~7m/s时,粗分离器能够将较多的粗颗粒收集下来再次循环进入分解炉。
[Abstract]:The external circulation high solid gas ratio calciner uses the centrifugal separation principle to selectively let the coarse particle material as the outside circulation. The engineering practice shows that it has the advantages of good thermal stability, high heat load per unit volume, high decomposition efficiency and so on. At the same time, it has obvious effect on reducing the emission of harmful gases. In order to further enrich the basic data of the furnace and optimize the structure and operation parameters, this paper is based on the basic furnace structure developed by the Institute of Powder Engineering. The quantitative relationship between the inlet wind speed of the tertiary air tube and the bottom structure parameters of the separator and the system resistance loss, the external circulation rate and the separation characteristics in the external circulation high gas ratio calciner system is investigated. To provide the basic parameters for the optimization design of the subsequent industrial plant. The following conclusions are obtained: (1) with the increase of the cross-section wind velocity of the calciner, the resistance loss of the external circulation system and the individual structure increases gradually. The change of structural parameters of cone under coarse separator aggregate has a significant effect on the resistance loss of external circulation system. The influence of the axial position of coarse separator on the resistance loss is much greater than that on the area of cone. Under the condition of no load, the resistance loss corresponding to the type of OSI 1 pyramidal structure is minimum. The resistance characteristics of the type DS 1 conical structure are optimized under load condition. When the cross section of the calciner is the same, with the increase of the third wind speed, the resistance loss of the tube on the calciner increases. In the range of wind speed of 5.0 m / s to 8.0 m / s, the resistance loss of external circulation system with charge load increases by about 3.0m / s compared with that of no-load operation. For the high-efficiency separator, the separation efficiency 畏 g increases first and then decreases with the increase of the cross-section wind velocity of the calciner. At the wind speed of 6 m / s, the separation efficiency 畏 g is the highest. The change of the structure parameters of the cone under the coarse separator has a great influence on the circulation rate of the external circulatory system. The total separation efficiency of the coarse separator decreases first and then increases with the increase of us. Of the seven conical structure parameters, the outer circulation rate corresponding to the IS1 structure is the highest, while the outer circulation rate of the rest is decreased according to the CS3 / CS1 / CS2 / DS1 / USI / USI / US1 structure.) for the same coarse separator pyramidal structure, when 5 / 6 m / s / s is 2628m / s, or when 78-ms-1 / s / s is over 24m/ s, The classification efficiency of the same particle diameter DP is higher, and the change of the structure parameters of the cone under the coarse separator has a great influence on the classification efficiency. When the particle size is in the range of dp40 渭 m and dp55 渭 m, the fractionation efficiency varies very little, that is, it is insensitive to the change of wind speed us, and the particle size is in the range of 40 渭 mdp55 渭 m, the fractionation efficiency varies greatly, that is, the wind velocity us has a significant effect on the fractionation efficiency, and when the particle size is in the range of 6 渭 mdp55 / s, The coarse separator can collect more coarse particles and recycle into the calciner again.
【学位授予单位】:西安建筑科技大学
【学位级别】:硕士
【学位授予年份】:2015
【分类号】:TQ172.6
【参考文献】
相关期刊论文 前1条
1 彭新战;周勇敏;张少明;胡道和;吴石福;王辉;;循环流化床新型分料器的性能[J];南京工业大学学报(自然科学版);1993年S1期
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