基于Dupline现场总线在选煤厂胶带输送机保护中的设计

介绍了Dupline现场安装总线的构成、信号传输原理及应用特点,论证了选煤厂胶带输送机的保护装置采用Dupline现场总线控制的优点;该保护方案的使用,既减少了接线设计工作、提高了设计效率,又减少了控制电缆及其敷设工程,并可极大地发挥了PLC软件的作用。     

Dupline与KHP257 CAN现场总线在保护选煤厂胶带输送机方面的应用

根据Dupline与KHP257 CAN现场总线在保护选煤厂胶带输送机运行方面的情况,对比分析了系统构成、控制原理与PLC通信、系统功能特点,为选煤厂远距离胶带输送机的控制保护提供了借鉴。     

现场总线技术应用于火力发电厂的研究与探讨

本文简述了现场总线的定义、特点及发展现状,对现场总线技术进行了深入的分析和研究,总结了现场总线控制系统的优点以及在火力发电厂推广应用的必要性,探讨了国内火电厂中应用现场总线技术的设计原则和应用范围。     

现场总线技术应用于浮法线的控制系统

本文简要地介绍了现场总线及Profibus现场总线技术，论述了Profibus现场总线技术在浮法线控制系统中的应用。     

FF现场总线在75t/h锅炉中的应用

介绍了FF现场总线系统的构成及特点。结合现场总线在75t／h锅炉中的实际应用及使用效果，对现场总线系统的特点及可靠性进行了分析。     

FF现场总线及在上海赛科项目中的成功应用

介绍了基金会现场总线模型及物理层电气特性;详细介绍FF现场总线在上海赛科项目中的应用情况以及在应用中应注意的问题。通过应用实例,说明该总线系统有着广阔的发展前景。     

FF现场总线系统在氧化铝焙烧炉煤气脱硫工程中的设计与应用

根据基金会现场总线在氧化铝焙烧炉煤气脱硫工程中的设计应用,详细介绍了FF现场总线系统、现场仪表选型及FF现场总线网段与拓扑结构设计等工程设计过程,给出了FF现场总线系统的接地方式、控制回路与组态。     

现场总线控制系统在液体SO3装置上的应用

结合美国SNAR公司现场总线控制系统在液体SO3装置上的应用，介绍现场总线控制系统的结构、技术特点，现场总线仪表及其主要功能模块。阐述了控制回路的组态方法、现场总线仪表组态软件及系统人机接口软件的功能、特点。     

工业控制系统的发展方向--现场总线技术

介绍现场总线的结构、特点及发展,简述现场总线的应用前景。     

现场总线在海上平台的选择和应用

随着现场总线的技术发展,依托其实用性与可靠性以及开放性的优点,在自动化控制领域使其得到广范围的应用。本文简单介绍了现场总线技术,并以旅大项目为例,详细的介绍了目前现场总线技术在海洋石油平台上的一些应用及介绍。     

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.     

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.     

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.