高庄煤业公司矿井及选煤厂合理配采、配洗的研究与应用

高庄煤业公司井田3上煤、3下煤煤质特性差别较大,生产过程中配采比例若控制不合理,易造成洗精煤质量不符合合同要求,影响煤炭销售和经济效益;通过对两层煤煤质特性分析,提出合理的配采和选煤厂配洗方案,使选煤厂产品质量稳定,经济效益增加。     

贵州响水选煤厂配煤洗选对策及效果

分析了响水选煤厂入选原煤的粒度及浮沉组成,针对两主采煤层硫分差异较大的问题,采用配煤入选工艺,选后精煤产品满足了客户要求,提高了选煤厂的经济效益。     

新建选煤厂配煤入洗的研究

根据新建选煤厂入洗原料煤来源多,煤质及煤种差异大和产品用户多的特点,分析了该厂采用配煤入选和产品配煤销售的可行性和必要性,介绍了多种配煤方案,通过经济效益分析,得出配煤入选可实现经济效益最大化。     

汾西矿业集团建设精煤配煤系统的探讨

介绍了汾西矿业集团公司煤炭资源概况、地理位置及煤质特性 ,针对高、低硫煤的特点 ,分析了实施精煤配煤的必要性 ,提出了几种精煤配煤系统的方案 ,认为在介休选煤厂建设精煤配煤系统是实现集团公司煤炭资源有效利用和利润最大化的合理可行方案     

阳煤二矿选煤厂精准配煤升级技术改造方案研究

通过对阳煤二矿选煤厂末煤发热量情况及配煤现状进行分析,针对配煤系统存在的问题,提出实施精准配煤升级改造的技术方案,并论证了方案实施的可行性,预测了提高的经济效益。     

华阳集团寺家庄选煤厂精准配煤改造与应用

寺家庄选煤厂现有配煤系统的自动化水平较低,基本依靠人工采制化的煤质信息来调整煤仓下闸板开度、给煤机频率等,进行粗略配比;由于煤质监测的滞后性,无法实时指导配煤,产品质量不能满足用户需求;针对寺家庄选煤厂配煤系统存在的问题,提出实施精准配煤升级改造的技术方案,并论证了方案实施的可行性,达到煤质可控的目的,提升了选煤厂的经济效益。     

自动配煤在方山选煤厂的应用

根据方山选煤厂的情况,介绍了实现自动配煤的方法及控制系统的硬件配置和控制方案。应用效果表明,几种原煤落到同一条带式输送机上,通过皮带秤准确计算出各自的瞬时流量,整个配煤控制过程运行平稳,达到自动配煤的目的。     

哈拉沟选煤厂末煤系统优化实践

哈拉沟选煤厂在生产过程中存在着末煤入选率低,煤泥难以沉降,压滤机处理能耗高、效率低、无法满足末煤煤泥量过高的处理要求,末煤系统必须满负荷运转等问题;为此,选煤厂采取了选前配煤入洗、降低浅槽入选下限、煤泥筛前脱粉、改进浓缩机加药方式等优化措施,达到了控制末煤入选比例、减少煤泥入选率、提高煤泥水处理效果的目的。     

弱黏煤配煤炼焦的实验研究

根据煤岩配煤理论,分析以往生产配煤比方案、装炉煤和焦炭质量,结合弱黏煤和其他各煤种性质,制定了五种配煤比方案,利用40kg焦炉进行实验.通过分析各配煤比方案以及单种煤、装炉煤和焦炭结果,认为弱黏煤配比应控制在3%～5%之间,最后经4.3m顶装焦炉生产实践验证结果在正常生产的范围内.     

配煤技术在选煤厂的应用

阐述了配煤技术在选煤厂的应用条件和范围，介绍了白龙选煤厂在应用配煤技术方面的一些具体做法及其实际效果。     

Differences between mineral coal and extracted coal

A distinction is proposed between mineral coal and extracted coal. Mineral coal is a complex natural composite that is found in underground beds, while extracted coal is created from mineral coal in working those beds. It is important to keep in mind that mineral coal is created by natural processes, whereas extracted coal is produced by human activity.     

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。     

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。     

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.     

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。     

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.