TBS粗煤泥分选机在新柳选煤厂的应用及分析

新柳选煤厂是隶属于山西汾西矿业集团新柳矿，是以入洗主焦煤为主的矿井型选煤厂，2004年投产，年设计入洗能力380万吨。2009年，在原先：重介加浮选的工艺基础上，进行了改造，采用重介、TBS粗煤泥分选、浮选的联合工艺。     

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。     

纳林河选煤厂增加末煤入洗工艺技术改造的生产与实践

中煤纳林河二号井选煤厂原动力煤选煤工艺为200～13 mm块煤采用重介浅槽排矸,-13 mm末原煤不入洗;针对煤炭市场对煤炭产品质量要求越来越高的要求,在原洗选工艺基础上增加-13mm末原煤入洗的技术改造工作,取得了良好的经济效益。     

三产品重介质旋流器应用的探讨

阐述了三产品重介质旋流器采用有压与无压入料方式的优缺点以及无压工艺介耗高的原因,分析了脱泥入洗和粗煤泥分选设备同旋流器配合使用对分选效果的积极作用,总结出重介质旋流器用于分选重产物含量较多的原煤时,底流最大排放能力的计算式。     

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。     

王台铺矿选煤厂末煤车间重介改造的可行性

王台铺矿选煤厂由于入洗的原 3#煤源即将枯竭 ,需采用二号井的 3#煤配洗。为了增加末煤洗选车间的处理能力 ,需增加一套重介分选系统 ;根据技术方案和经济效益的分析比较 ,认为采用重介分选系统不仅可根据市场需要灵活改变洗煤品种 ,而且可对几种产品进行优化组合 ,达到最大的经济效益。     

铁东选煤厂的设计特点

介绍了铁东选煤厂设计的主要内容和特点：根据煤质特性采用分级入洗工艺和三产品重介旋流器分选技术；分选工艺对煤质和市场的适应性强；采用的机电设备运行可靠；依靠综合技术措施，保证精煤产品水分合乎要求；全厂主要工艺设备实现自动监控等。     

单一介质的重介浅槽和重介质旋流器分选系统在大型动力煤选煤厂的应用

介绍了单一介质分选系统工艺技术;论述了单一介质的重介浅槽和重介质旋流器分选系统与独立的块煤重介系统和末煤重介质旋流器系统的不同点;结合单一介质系统在8座大型动力煤选煤厂的实践,从排矸降灰、入洗原煤粒度波动、介耗和操作运营等方面分析了单一介质工艺在动力煤选煤厂应用的特点。     

易碎无烟煤保块洗选工艺探索与实践

通过分析沁水龙港煤炭加工配送中心选煤厂入厂原煤的筛分、浮沉资料,比较各种块煤洗选设备适用特点及分选效果;结合拟建选煤厂产品结构,确定采用大直径无压三产品重介旋流器作为主洗选设备,并制定了选煤工艺;同时根据流程计算结果,确定主要设备规格型号及数量;选煤厂自2019年年初建成以来,生产系统运行稳定、分选效果良好,大直径无压三产品重介旋流器生产洗中块和洗小块获得成功应用。     

Molecular components of coal and coal structure

A high-volatile bituminous coal was extracted at room temperature by various organic solvents. The yields of the extracts ranged from 4.5 wt% daf (ethanol/benzene extract) to 38 wt% daf (pyridine/ethylenediamine extract). The extracts were analysed by Fl mass spectrometry; the volatile part (75–80 wt%) was composed of substances of molecular weight in the range 70–800 amu, but the compounds in the 200–600 amu range predominated. Over 300 compounds were identified by high-resolution mass spectrometry. The results indicate that compounds < 800 amu constitute at least 30 wt% daf of the analysed coal.     

Electrical conductivity of coal and coal char

The electrical conductivity of coal, at either 1 kHz or d.c., was measured at 24 °C on samples recovered from pyrolysis experiments aimed at modelling conditions during in situ gasification of coal. From an initial value of 10⁻³ S/m (when the coal is saturated with formation water), the conductivity decreases to 10⁻⁸ S/m when the coal is heated to 110 °C in vacuum. This low value, presumably due to dehydration of the coal, prevails for samples heated as high as 500 °C in dry argon. Samples of char recovered after pyrolysis to 800 °C or more have a conductivity of 10² S/m. Capitalizing on the large contrast between the conductivities of coal and char produced during gasification, electrical probing may be a sensitive tool for monitoring ‘burn-front’ progress during in situ coal gasification.     

澳大利亚煤代替西曲焦煤的配煤炼焦研究

对澳大利亚煤和国内6种单种煤进行煤质分析和配煤炼焦实验,分析澳大利亚煤代替西曲煤进行炼焦的可行性。结果表明澳大利亚煤具有低灰低硫、高挥发分等特点,在炼焦中用澳大利亚煤替代西曲焦煤可降低焦炭的灰分和硫分,增大焦炭的各向异性指数,改善焦炭强度。     

Industrial coking of coal batch without bituminous coal

For many years, Kuznetsk-coal batch has always included bituminous coal. Depending on the content of such coal, the batch may be characterized as lean, moderately clinkering, or bituminous. This classification was adopted by specialists of the Eastern Coal-Chemistry Institute (ECCI) in experimental coking at Magnitogorsk Metallurgical Works in 1945 [1]. Lean batch contained 10% Osinovsk bituminous coal (plastic-layer thickness y = 13 mm); moderately coking coal contained 25% bituminous coal (y = 16 mm); and bituminous batch contained 40% of such coal (y = 20 mm).     

黏结煤与不黏煤共热解特性研究

为了利用内构件反应器热解技术实现黏结性煤的高值化利用,采用TG-MS和固定床反应器研究了黏结的山西兴县煤(简称XX煤)与不黏的先锋褐煤(简称XF煤)共热解时的破黏和热解特性。TG-MS实验结果表明,XX煤与XF煤配制的混合煤比XX煤黏性小,且XF煤促进了XX煤热解,混合煤热解行为是两种煤共同作用的结果。固定床热解实验表明,煤粒径越小,降黏越显著;XX煤和XF煤的比例(XX:XF)越小,降黏越显著,XX:XF小于5:5时,可消除结焦团块;XX:XF越小,半焦产率越低,焦油和煤气产率越高;随XX:XF减小,焦油中<170℃和230~300℃的馏分含量先升后降,XX:XF=6:4~3:7时最高,170~210℃、210~230℃和300~360℃的馏分逐渐增加,>360℃的馏分含量不断降低;随XX:XF的减小,H2含量先升高后降低,在XX:XF=3:7时最高;CO含量呈略微升高趋势;CO2含量先逐步升高,在XX:XF=6:4达到最高,然后从XX:XF=5:5开始降低,在XX:XF=3:7达到最低,然后又开始升高;CH4及C2~C3组分含量呈下降趋势,而H2+CO+CH4 (煤气中有效组分之和)的含量先下降再升高接着再降低,在XX:XF=6:4时最低,XX:XF=3:7时最高。XX:XF越小,虽半焦的C/N和C/H不断减少,但C元素含量增幅和N, H元素含量减幅增大;比表面积越大,内孔结构越多越大,起燃温度越低,燃烧越彻底。     

关于混煤的配煤探讨

针对生产用煤多为复杂混煤的不利情况,在常规分析数据的基础上利用岩相分析手段指导配煤,有效稳定了焦炭质量,明显改善了焦炭的热态性能。     

高硫焦煤在配煤中的应用

通过研究高硫焦煤的理化性质,在配合煤中配入一定比例的廉价高硫焦煤,焦炭质量得到改善,主焦煤的使用比例减少,入炉煤成本大幅降低.     

Coking properties of coal pitch in coal batch

The coking properties of coal pitch depend significantly on its fractional composition, which determines the set of structural components involved in meso-phase formation. The optimal combination of high-molecular aromatic compounds, polycyclic compounds of intermediate molecular mass, and hydrogen-donor hydroaromatic components corresponds to a ratio of pitch fractions α: β: γ = 1: 2: 2. This is typical of coal pitch with a softening temperature of 75–85°C. Such pitch is the best clinkering additive to coking batch, resulting in the production of coke of maximum strength.     

Catalytic activity of coal minerals in hydrogasification of coal

Hydrogasification of six bituminous coals was studied in a fixed-ped flow reactor at pressures up to 2 MPa and temperatures from 790 to 960 °C. Ranges of distinct methane formation are found with all coals between 500 and 600 °C, 750 to 800 °C and >850 °C. The reactions in the first two ranges are determined by the molecular structure of coal and are not affected by catalytic activities of constituents of coal minerals. In the third range, >850 °C, iron as a constituent of mineral matter of coal can accelerate methane formation significantly if the pressure is sufficiently high. Thermodynamic calculations indicate, and were verified by thermogravimetric studies, that iron disulphides in original coals can be desulphurized during gasification. Alkali and alkali earth oxides and carbonates can act as sulphur scavengers via an exchange reaction and thus accelerate the desulphurization of iron sulphides.     

煤岩学在炼焦配煤中的应用进展及优化配煤技术

科学合理的配煤技术对于焦化企业高质量发展至关重要,炼焦配煤技术的核心在于对原料煤煤质特性的深入认知。影响炼焦煤性质的主要因素包括变质程度、煤岩组成及第三成因因素,故煤岩学对炼焦配煤技术的研究与应用至关重要。本文论述了经验配煤、煤岩配煤及人工智能配煤3种炼焦配煤技术发展历程和现状,凝练了炼焦配煤技术的发展趋势。结合研究实际,重点梳理了煤岩学指标在炼焦配煤中的应用现状。在注重煤岩特征的同时,也需兼顾工艺指标等相关参数对炼焦煤优劣的表征。在实际应用中,各项指标参数的选择和利用需要综合考虑参数适配范围并尊重该指标与炼焦煤特性的真实对应关系。基于以上内容,提出了关联成煤时代、产地等地质因素和黏结指数、胶质层指数等工艺指标的整体思路,实现焦炭性能与原料煤特性的科学、深入关联,构建“本源-过程-结果”一体的优化配煤技术新体系。