利用在线测灰仪实现产品自动配煤

陈四楼选煤厂针对原手动配煤系统生产末原煤产品存在的问题,采用自动配煤系统对其进行改造;介绍了改造的技术路线、自动控制系统结构及软硬件组成情况;实践表明,配煤系统的自动化,提高了配煤的稳定性和精度,增加了选煤厂的经济效益。     

基于长距离煤炭运输的供煤系统优化技术研究

为保障矸石电厂燃料供给稳定,准能公司建成长距离管状胶带机运输系统,架构起选煤厂(供煤源)与矸石电厂(受煤源)点对点桥梁;选煤厂为保证供配煤热值稳定,在供给侧方面,对内部供煤环节进行优化调整,在保证商品煤外运和内供双重需求前提下,生产系统可以灵活生产;增强了选煤厂产品煤煤质稳定性,降低了矸石电厂燃料煤供给运营成本。     

选煤产品结构优化软件的研究与应用

为了进一步提高选煤厂经济效益,针对斜沟煤矿选煤厂的工艺特点,开发了产品结构优化软件;通过对各工艺环节分离效果的分析与诊断,结合煤质资料和产品价格,运用粒子群算法,探索出最佳洗选方案及系统各工艺参数,实现了经济效益最大化的目标;该软件在平移分配曲线的基础上增加了多工艺参数的迭代分析,寻找最优解,算法高效准确,适应大多数选煤工艺需求;斜沟选煤厂在精煤市场疲软时,矿井8号煤和13号煤的最佳入洗配比为1∶4,最大经济效益为188.6元/t;在精煤产率最大化时,矿井8号煤和13号煤最佳入洗配比为1∶6,最大经济效益为220.4元/t。     

黄白茨矿选煤厂配煤入洗优化方案的研究

随着矿井开采深度的增加,黄白茨选煤厂入洗的原煤煤质逐渐变差,给跳汰选煤工艺带来了很大的挑战;为了提高生产效率,根据周边煤矿的煤质,提出了几种配煤入洗方案;经比较认为,苏海图矿12号煤和黄白茨矿10号煤按7∶3配煤入洗,能基本满足选煤厂现有跳汰分选工艺的要求;同时提出,选煤厂要结合自身特点,抓好机电设备管理,引进新设备、新手段,优化生产工艺,实现专业化管理,智能化选煤,效益化生产。     

兴县选煤厂工艺流程的选择

为设计高效、节能的选煤工艺,分析了兴县选煤厂8-2号煤层和13号煤层的煤质特征,根据煤质特征优化了选煤厂产品结构;通过对比常用选煤方法,确定了兴县选煤厂选煤工艺。结果表明,2个煤层50~0.5 mm各粒级产率总体分布较为均匀,灰分随着粒级的降低逐渐减小,矸石不易碎。50~1.5 mm低密度物产率和中高密度物产率相近,具有轻重产物密度组成倒置的反常现象,不易分选低灰精煤产品。兴县选煤厂以生产动力煤为主,兼顾炼焦配煤,8-2号煤和13号煤按照质量比2∶1生产十级精煤或优质动力煤,也可以生产一般动力煤。选煤厂最终工艺流程为:50~1.5 mm脱泥有压两产品重介质旋流器主再选,1.5~0.25 mm粗煤泥离心机脱水,0.25 mm细煤泥浓缩压滤回收。     

葫芦素选煤厂提升系统效率及灵活性的改造实践

介绍了葫芦素选煤厂的工艺特点，分析了生产系统存在的问题。有针对性地对主洗车间矸石脱介筛、矸石带式输送机、配煤刮板机、原煤破碎车间等工艺设备进行了一系列改造，取得了较好的效果，选煤厂处理能力大幅提高，生产系统运行稳定。     

超声雾化(干雾)除尘系统在古城矿选煤厂的应用

介绍了新型除尘设备——超声雾化(干雾)除尘系统的工作原理、结构组成、主要特点及技术参数;该除尘设备在古城煤矿选煤厂原煤储运、准备系统和产品煤运销系统应用后,取得了很好的除尘效果,除尘效率达到95%以上,吨煤除尘成本约0.201元,为选煤厂安全生产、职业病有效防治、延长设备使用寿命、提高生产效率和经济效益提供了有效保障。     

综合利用洗选尾煤和环境保护

随着苏联煤炭工业的迅速发展和煤入洗量的增加,选煤生产中综合利用尾煤以及环境保护就成了重要的问题。目前,苏联选煤厂每年约加工三亿吨煤。要合理利用自然资源及环境保护必须保证:1.综合利用随煤一起开采出来的煤矸石和洗选尾煤;2.在选煤厂实现水——煤泥系统闭路循环;3.排放到大气中的气体净化到符合卫     

KS5.7脱粉机在潘三选煤厂的应用

为了使生产能正常进行、减少细颗粒煤对煤泥水处理系统的压力.潘三矿选煤厂从德国引进了一台脱粉机,在生产过程中该设备脱除细颗粒煤起到了积极的作用.本文简要介绍了设备的基本性能和潘三选煤厂的使用效果.     

临涣选煤厂配煤系统探讨

淮北临涣选煤厂入洗的原煤来自周边的矿井,入洗的煤质稳定性差,配煤入洗能很好的解决这一问题。其配煤车间较早之前采用人工配煤,主观误差很大,系统响应慢。PLC技术和变频器的使用,实现了配煤的自动化,提高了工作效率。对临涣选煤厂西区原煤仓上的配煤系统进行了介绍,并在此基础上提出改进设计意见。     

Investigation into the fate of mercury in bituminous coal during mild pyrolysis

Two high-volatile bituminous coal (Lower Freeport #6A and Pittsburgh #8), used primarily for electricity production, were tested to determine the fate of their mercury content during mild pyrolysis. Mono-sized samples of the well characterized coals were tested under nitrogen in a horizontal tube furnace at different residence times at different temperatures throughout the range 275–600°C. The resulting char was analyzed for mercury, and compared to the original parent coal concentration. The percent Hg removal was found to be a function of both residence time and temperature. The data for both coals have shown two distinct regimes; a low temperature chemical evolution mechanism which follows an Arrhenius form (apparent activation energies for the Lower Freeport #6A and the Pittsburgh #8 coals are 25.6±1.5 and 21.7±1.9 kcal/mol respectively), and a higher temperature regime where the Hg evolution dramatically decreases. This can be attributed to the changing structure of the coal at these higher temperatures. The results of bomb calorimetry analysis performed on the Lower Freeport #6A coal samples verify that the overall heating value of the coal is essentially unaffected by mild pyrolysis at temperatures lower than 400°C.     

航天炉粉煤贮罐过滤器堵煤原因分析及对策

在航天炉从试车投产至稳定运行期间,多次出现粉煤贮罐过滤器锥部堵煤现象。经过逐一排查分析,发现是由于氮气吹扫管线风量较大、防雨罩结构不合理、贮罐内外温差较大导致粉煤贮罐过滤器锥部的堵煤。采取了有效的预防和整改措施后,解决了堵煤问题,保证了煤粉加压输送系统的长周期稳定运行。     

利用烟道废气对煤塔实施保温

介绍了利用焦炉烟道废气余热对煤塔实施冬季保温的工艺流程、设计计算及保温效果。     

Development of Coal Preparation Industry in China

1Three stages of developmentCoal preparation industry in China started rather late.Onthe establishment of the People’s Republic(1949),there wereonly ten coal preparation plants and coal processed amounted toonly several million tons.Since then,its development is accel-erated roughly in three stages.The first is the starting stage(1949~1980),being alsocalled as the stage of“cleaning coal to ensure steel produc-tion”.In early period after establishment of the People’s Re-public,The Centr…     

中国选煤的发展

介绍了在中国选煤发展的起步阶段、成长阶段、快速发展阶段选煤厂的建设和生产情况；目前,我国原煤入选能力和入选原煤量迅速提高,选煤技术明显进步,重点发展了重介质选煤法；“十一五”期间,国家将大力发展洁净煤技术,要求煤炭入选率由目前的32％提高到50％。     

开滦动力煤选煤厂洗选炼焦精煤方案探讨

介绍了开滦动力煤选煤厂的主要工艺流程,通过对原煤资料的分析提出洗选炼焦精煤的方案,对主要选煤环节进行了能力校核,并对经济效果进行了评价,论述了在当前煤炭市场下利用现有流程洗选十二级炼焦精煤的可行性。     

李家壕选煤厂提高产品发热量的措施

为提高李家壕选煤厂产品发热量,分析了原煤性质,说明原煤属低灰~中灰、低硫~中硫、特低磷、中高发热量的不黏煤和长焰煤;原生煤泥中混入较多矸石,且矸石易泥化,分选时应尽可能减少煤和矸石与水的接触时间;次生煤泥灰分极高为74.23%,矸石破碎泥化现象严重,主要集中在-0.045 mm细煤泥中。通过提高选煤厂管理水平,改造过煤溜槽,增设外来煤系统、细煤泥外排系统和矸石直接外排系统等措施对选煤厂进行改造。改造后选煤厂管理水平不断提高,原煤水分大幅降低,平均降低3%左右;外来优质煤的掺混使原煤仓、产品仓和过煤溜槽的黏堵情况得到改善,细煤泥快速回收;块精煤和混末煤产品的发热量明显提高,每年增加利润近3000万元。     

Effect of Wyodak coal properties on hydroliquefaction reactivity

The effect of Wyodak coal properties on liquefaction reactivity as measured by distillate yield and cyclohexane conversion has been investigated. Spot samples of four Wyodak subbituminous coals from the Anderson and Canyon coal seams in the Powder River Basin of NE Wyoming were liquefied in microautoclave and batch reactor experiments. Runs were made using two different Wyodak coal-derived solvents. Emphasis in this work was directed toward correlation of C₄-700 K distillate yield and cyclohexane conversion as functions of measurable physical, chemical and petrographic properties of the feed coal. Reactivity rankings were found to be the same using either measure of coal reactivity. However, the data indicated that distillate yields were a function of both solvent quality and feed coal properties. For each solvent studied, selected coal properties, including carbon content, total and organic sulphur content, vitrinite content and total reactive maceral (vitrinite plus exinite) content, were found to give statistically significant correlations with distillate production and cyclohexane conversion. Pyritic and sulphate sulphur contents did not appear to enhance liquefaction yield or conversion at the reaction conditions studied. However, any catalytic effects due to pyrite or sulphate sulphur may have been masked by the use of two high quality liquefaction solvents.     

复配分散剂与不同煤化程度煤成浆性能的研究

为了考察复配分散剂对不同煤化程度煤的成浆性能的影响,以木质素磺酸钠与萘磺酸钠复配分散剂对山西王坡煤(WP)、淮北朱仙庄煤(ZXZ)、内蒙古上湾煤(SW)3种不同煤化程度的煤样进行了制浆试验。结果表明:复配分散剂对上湾煤样所成浆的流动性和稳定性产生较大影响,但成浆浓度不高;对较高煤化程度煤样的成浆性提高效果明显,选用3号分散剂王坡煤的成浆浓度达到最大66.8%;朱仙庄煤选用4号分散剂可以制成流动性和稳定性较好的煤浆,其煤浆浓度达67.0%。木质素磺酸钠及萘磺酸复配分散剂的协同作用对不同煤化程度煤样成浆性的影响与煤的结构有关,此复配分散剂对煤化程度较高煤的成浆性提高较有利。     

屯兰选煤厂浮选系统改造可行性分析

为了提高屯兰选煤厂浮选系统的分选效果,提高精煤回收率,减少因煤泥灰分高而造成煤炭资源的浪费,通过对选煤厂浮选系统中存在的浮选尾煤灰分低,分选效率低,浮选药耗高和浮选精煤池消泡困难的问题进行分析,提出了更新改造工程方案,并对方案进行了预测及论证。结果表明,通过对XJM-12浮选机进行更新改造,可以有效提高浮选精煤产率及浮选尾煤灰分,同时节省浮选药耗及电耗,节约选煤成本,年增加经济效益4208.96万元。