【作者】 李延锋；

【导师】 刘炯天；

【作者基本信息】 中国矿业大学 ， 矿物材料工程， 2008， 博士

【摘要】 粗煤泥分选问题成为影响精煤产率提高的主要瓶颈。大直径重介旋流器和浮选柱的大量应用,在提高产品质量和分选效果的同时,也一定程度上降低了介于重选和浮选粒度交界附近粗煤泥的分选效果。而液固流化床分选机的分选原理能够吻合粗煤泥本身的粒度范围窄、需要低密度分选的特点,是一种结构简单、分选效果较好的新技术,国内研究才刚刚起步。研制开发具有自主知识产权的液固流化床粗煤泥分选机对我国选煤技术的发展,尤其是粗煤泥分选技术的发展起到巨大的推动作用,具有十分重要的意义。论文将化工上的多管分布器和侧流分布器结合起来设计了新型的流体分布器,并设计了液固流化床粗煤泥分选机,申请了设备专利。先后经过初步构思模型、设计模型机、实验室试验、内部流场的模拟及相关流体动力学研究、分选分层机理研究、半工业试验系统构建及半工业试验,设计并制作了2FBCC-1500液固流化床粗煤泥分选机,分别在成庄选煤厂末煤车间和葛店选煤厂进行了工业试验,结果表明:对成庄选煤厂螺旋分选机尾煤分选试验,取得了>0.125mm粒级的E值均在0.07-0.10之间,合格精煤产率超过了30%,粗煤泥分选试验取得了精煤灰分在10-11%之间,尾煤灰分63%以上,精煤产率在73%-76%之间的良好指标,其分选效果明显优于螺旋分选机,全厂精煤总产率提高1个百分点以上。而在比张双楼选煤厂粗煤泥难选的情况下,葛店选煤厂分选机工业试验取得了与张双楼选煤厂进口粗煤泥分选机相同的分选效果,可使全厂的总精煤产率提高4个百分点,经济效益显著。工业运行表明:液固流化床粗煤泥分选机设计合理,系统稳定,指标波动小,自动化程度较高,操作简单。根据目前国内大多选煤工艺存在不同程度的重选和浮选背粗煤泥的现象提出了增加液固流化床粗煤泥分选的三段选煤新工艺。根据液固流化床分选机的入料中高灰细泥基本都进入到溢流的特点,首次指出工业生产中从工艺上降低入料中的高灰细泥含量及强化精煤的脱泥效果是液固流化床粗煤泥分选机成功应用的关键,并提出了包括预先脱泥浓缩、流化床分选机溢流脱泥脱水在内的液固流化床+浮选柱的煤泥分选回收新模式。设计的液固流化床粗煤泥分选机的分选性能达到了设计要求,填补了我国在液固流化床粗煤泥分选机研究领域的空白。更多还原

【Abstract】 The separation of coarse slime has become the key point affecting the clean coal yield. Application of a great deal of dense-media cyclones of large diameter and flotation columns has improved the product quality and the separation effect, but which has reduced the separation effect of coarse slime which is between gravity separation and flotation. The separation theory of Liquid-Solid Fluidized Bed coarse slime separator(LSFBCSS)can match the characteristics of narrow granularity bound, low density separation of coarse slime. It is a new technology with excellent separation results and with simple configuration. The research about it has just begun in China. Excogitate of LSFBCSS with independent intellectual property has the pivotal imputes to the development of coal separation technology of our country, especially to the evolution of coarse slime separation technology. It has great significance indeed.The research of distributor combining the multi-pipe distributor with the side-flow distributor used in chemical engineering are carried out, finally the new separator is designed and patented. After the process of conceiving principium model, model design, laboratory tests, simulation of inside flow, research of associated hydrokinetics, research of separation stratification theory, construction of pilot test system and pilot test, the Liquid-Solid Fluidized Bed Separator 2FBCC-1500 was designed and manufactured, and the relevant industrial trial has been carried out in Chengzhuang and Gedian preparation plant respectively. The results have been concluded as follows: In Chengzhuang preparation plant, the separation trial was carried out with the tailings of the spiral separator,the E values of particles more than 0.125 mm are all between 0.07 and 0.10 and the eligibility clean coal yield is more than 30% have been achieved, while the ash content of cleaned coal is between 10% and 11%, the ash content of tailings is more than 63% and the clean coal yield is between 73% and 76% in the separation of coarse slime. The separation effect is better than that of the spiral separator markedly, and the clean coal yield of the whole preparation plant increases more than one percent. The separation effect of particles larger than 0.125mm in Gedian preparation plant is equal to that of Zhangshuanglou preparation plant with the import coarse slime separator, but the pollution of feed in former is more serious. The clean coal yield of the whole preparation plant increases four percent,which will bring great benefit in economy. The industrial test shows that the LSFBCSS has been reasonablely designed with high stability, low undulation in results, lofty auto-control system and easy operation.According to the inefficient separation effect of the coarse slime existing in most of domestic coal separation technology, three stage coal separation technology adding Liquid-Solid Fluidized Bed coarse slime separation has been applied for the first time. According to the characteristics that all the fine slime with high ash content goes into the overflow, which will increase the ash content of the clean coal, the opinion that reducing the content of fine slime of high ash and strengthen the effect of desliming is the key point to the successful use of LSFBCSS in industry is pointed out for the first time, also the new flowsheet for coal recovery using Liquid-Solid Fluidized Bed and flotation column, including desliming and concentrating of the feed, desliming and dehydration of the overflow product of Liquid-Solid Fluidized Bed Separator, has been developed. The separation capability of LSFBCSS has reached the design requirement and filling a domestic gap in this field.更多还原