高硫洗选尾矸综合利用工艺改进的研究

针对传统三产品重介选煤工艺和高硫洗矸脱硫生产工艺存在的主要问题,提出采用大锥角重介旋流器分选工艺改造二段中矸分选旋流器,增加煤炭回收率,减少高硫洗矸处理量,降低高硫洗矸脱硫加工生产运行成本,提高企业经济效益。     

入洗煤质分析与选煤方法的选择

采用优化计算对太原选煤厂入洗原煤进行跳汰和重介两种工艺的分选效果对比 ,根据煤质和市场需求进行了配煤入洗方案设计 ;分析结果表明 ,采用重介洗选工艺可以取得较好的经济效益。     

汪家寨选煤厂提高重介质旋流器分选效益的实践

针对汪家寨选煤厂重介质系统分选效益较低的问题,采取了控制入洗原煤粒度,改造更新脱介设备、合理调整重介分流操作方式等措施,杜绝了旋流器堵塞事故的发生,有效降低了介耗及悬浮液中的煤泥含量,达到了提高重介质分选综合产率和经济效益的目的。     

潘一选煤厂提高精煤产率的改进措施

分析了潘一选煤厂重介精煤、粗煤泥重介精煤和浮选精煤灰分波动大的原因,从技术与管理两方面提出了切合实际的重介分选系统、煤泥重介分选系统及浮选系统改进措施,不但可以稳定精煤灰分,而且有助于提高精煤产率,增加企业经济效益。     

中小型重介旋流器在大型选煤厂的应用

根据三座大型选煤厂工程实例,论述了不用粗煤泥分选系统,而是采用中小直径重介旋流器,也能实现粗煤泥有效分选,有效分选下限可降到0.15~0.25mm,简化了生产工艺,降低了工程投资和运行成本,提高了企业经济效益。     

木瓜界选煤厂扩建工程工艺特色

木瓜界现有选煤厂为应对井工煤质量变差的问题,进行了扩建;扩建后入厂原煤采用分级入洗方式,块煤和末煤洗选系统均采用重介主再洗工艺;各系统切换灵活、简单,具有分选精度高、经济效益好、系统可靠、自动化程度高、对煤质变化及产品质量要求的适应性强等诸多优点。     

重介旋流器分选高变质无烟煤的实践

采用无压三产品重介旋流器为主选设备的原煤混合入洗工艺分选高变质无烟煤,并对多个工艺环节进行了改造,生产稳定,分选效率较高,矸石带煤损失较低,吨煤介耗较低,经济效益显著。     

红柳选煤厂重介质分选过程智能化操控初探

针对红柳选煤厂选煤工艺及自动化现状,在现有块煤浅槽重介质分选系统自动控制的基础上进行智能化改造,增加基于机器视觉的入料及产品煤质组成分析系统和16路压力传感器测压的重介浅槽压力监测系统;同时建立专家知识系统,可根据重介分选系统的工作状态,实时对工艺参数提出操作建议。     

有压三产品重介旋流器分选粗煤泥工艺的应用

山东某选煤厂原设计为跳汰+粗煤泥干扰床分选,由于煤质变差、可选性变难,分选效果差,通过改造,主洗采用有压两段两产品重介旋流器分选、粗煤泥采用三产品煤泥重介分选、细煤泥浓缩压滤回收;实践表明,改造后的工艺系统分选效果好,在分选难选–极难选炼焦煤时,分选精度较高,技术指标先进,两产品重介旋流器可能偏差0.03~0.05,数量效率97%;粗煤泥三产品重介旋流器可能偏差0.041~0.078,数量效率92%;选煤厂每年可回收精煤泥19.3万t。     

贺西煤矿原煤准备车间技术改造可行性研究

分析了贺西煤矿选煤厂原煤准备车间改造前工艺流程及改造的必要性,介绍了重介质浅槽分选工艺的应用现状,阐述了采用重介质浅槽分选机取代动筛跳汰机的改造工艺流程;可行性研究表明,重介质浅槽分选工艺可有效提高分选效率,降低矸石带煤率,提高主洗系统的入洗能力,减少稀有煤炭资源的浪费,具有很好的经济效益和社会效益。     

选煤厂煤尘的综合治理

论述了煤尘的生成与危害,分析了选煤厂的产尘源,介绍了本厂采取综合治理措施、严格加强管理、有效治理煤尘的方法。     

临涣选煤厂产品装车给煤装置的改造

临涣选煤厂为了解决原产品装车给煤装置存在的问题 ,自行设计了一种新型给煤闸门替代原用的往复式给煤机 ,结构简单可靠 ,操作方便 ,彻底解决了原系统存在的窜仓问题 ,取得显著的经济效益     

Liquefaction of bituminous coal at moderate temperatures

Coal hydrogenation was investigated in the temperature range 275 to 325 °C in order to minimize the number of thermal side reactions that take place. Gas-phase hydrogen was used in batch experiments without an added donor solvent, to avoid the additional analytical complexities introduced by such a solvent. It was found that significant oil yields (up to 72% of the daf coal) can be obtained from the hydrogenation of bituminous coal at 325 °C. Furthermore, at this temperature, the data indicate that cleavage of certain C---O bonds may have an important role in oil formation. The metal surfaces of the liner and impeller of the autoclave had a strong catalytic effect on the liquefaction reactions under these conditions. The oil yield was 48% when the metallic surfaces were exposed and only 19% when these components were coated with glass. Catalysis by nickel, applied as nickel acetate impregnated into the coal, gave higher overall conversion, lower oil yield, and a more saturated oil product than catalysis by the autoclave surfaces.     

Nonsolvent coal hydrogenation at short contact time

Yields and properties of products on hydrogenation of Japanese and Australian coals have been studied using an autoclave equipped with a magnedrive device at temperatures of 500–600 °C and hydrogen pressure 4.9–14.7 MPa (gauge) in the absence of solvent. Optimum contact time, at which maximum extraction yield was observed, shifted from 15 s to a few seconds with increasing reaction temperature and hydrogen pressure. The extracts derived from both coals reveal similar structural parameters.     

选煤现场的安全管理

介绍了选煤现场安全管理的难点,从应用安全现状分析法、完善安全管理制度、实行岗位督查责任制、建立安全三级联保责任制、搞好动态危害辨识和控制工作等方面论述了如何搞好选煤现场安全管理工作。     

煤泥—煤矸石混烧技术在沸腾床锅炉上的应用

依据洗煤泥—煤矸石的混合特性 ,在沸腾床锅炉上进行了混合燃烧试验 ,探讨了沸腾床锅炉燃烧洗煤泥—煤矸石的机理 ,确定了沸腾床锅炉掺烧洗煤泥改造的最佳方式及应采取的有效措施 ,指出了煤泥—煤矸石混烧过程中存在的问题     

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。     

Viscosity of coal tar pitch at elevated temperatures

At temperatures up to about 200 ° the viscosity of pitch, of approximately 100 °C Ring and Ball Softening Point, follows a predictable variation with temperature. Above 200 °C, variations occur depending on the source of the pitch, although a minimum viscosity is always achieved between 320 and 400 °C, followed by a rise. On heat treating at a constant temperature of 400 °C the viscosity rises. Although some preliminary work on two low-temperature pitches indicates a different regime, the work on coke-oven pitches shows a clear relation between viscosity rise and the formation of toluene- and quinoline-insolubles by what appears to be consecutive reactions from tar oils, during which the rheological behaviour becomes increasingly pseudoplastic.     

Transportation of coal concentrates at negative ambient temperatures

In the cold season, irregular coal supplies to coke plants are aggravated by the need to heat the coal cars. Thawing of rail cars in garages (enclosures) is the least efficient and most expensive approach. Treatment of the coal concentrates with chemical additives reliably prevents freezing in winter during transit from suppliers to consumers.     

选煤新工艺在响水矿选煤厂的应用

分析了不脱泥重介质分选以及跳汰粗选、重介质精选工艺的优缺点;根据响水矿煤质特点,提出了预先脱泥无压入料重介质旋流器+TBS干扰床粗煤泥分选新工艺;在响水矿选煤厂的实际应用表明,采用新工艺可提高选煤效率和精煤产率,大大降低介质消耗,提高经济效益。