选煤厂自动化控制技术的应用与实践

随着市场对煤矿资源需求量的不断增加,依托现代科学技术,煤矿生产与选煤的自动化水平与智能化水平不断提高。以现代自动化控制技术为基础,构建选煤厂集中控制系统,结合实际,合理选择应用电气设备,对设备运行状态进行自动化采集,逐步实现无人值班化操作,应用视频监控及调度设备,实现远程汽运装车控制。实践证明,在选煤厂中应用自动化控制技术,有助于提高生产效率与质量,其实践效益突出。     

选煤厂集中控制系统的分析及应用

西铭矿选煤厂通过把集中控制系统与生产工艺流程相结合,对生产现场的实际情况进行实时监控跟踪,对系统进行控制优化,实现了选煤厂自动化;通过对上位机监控系统、调度电视墙系统及信息管理系统进行构架,实现了选煤设备的单机和连接作业;通过自动保护、监视信息上传、现场实际数据自动分析、报警预警等技术的投入与应用,保证了设备的安全运转,提高了设备的利用率。     

基于STM32的选煤厂压滤机安全运行监测装置的研发

为确保选煤厂压滤机电机设备的安全、高效运行,电机相关参数的在线监测装置的研发意义重大。本文阐述了基于STM32的选煤厂压滤机安全运行监测装置的研发,结合目前煤矿洗选厂压滤机设备故障监测方面智能化、自动化、信息化水平较低的现状,开发了基于FreeRTOS操作系统,利用多任务机制实现对压滤机电机温度信息、振动信息及电流信号的实时监测和超限报警等功能,对于减少故障维修时间、提高经济效益以及煤泥资源回收利用、保护环境等方面具有良好的应用价值。     

选煤工艺中煤泥水浓缩处理系统的效率浅析

在选煤行业,随着原煤处理量的加大,增加了煤泥水的处理量,在原煤洗选工艺中对煤泥水处理是利用冶金行业衍变而来的普通型浓缩机进行浓缩处理,煤泥水的处理效率低下,系统事故率高,不能满足正常的生产需求;新型高效的耙式浓缩机的产生,将以效率高、处理量大的特点,应用在自动化程度高的大型选煤厂中,将替代普通型煤泥水浓缩系统。     

OPC SERVER在计算机信息管理系统中的应用

本文介绍了OPC SERVER技术在大连港矿石码头计算机管理系统中的应用。该系统通过OPC SERVER实时在线采集．分析和处理数据,实现生产、设备运行、企业管理等生产活动自动化,提高码头的通过能力,从而提高生产效率和经济效益等。     

三网合一在生产集中控制中的应用

新庄洗选厂集控系统改造方案采用了变传统远程I/O为具有独立运行功能的分站控制方式,并利用分站与主站进行IP访问的创新方案,减少了分站的独立调试与试运行时间,实现了不停产改造。同时首次在洗选厂集中控制系统中将生产控制信号、语音信号与视频信号同时走在光纤环网中,实现了"三网合一"目的。实际应用表明,改造后的生产集中控制系统实现了自动化控制,达到了高产高效、促进安全生产的目的。     

加强管理降低介耗提高经济效益

以太原选煤厂增设的无压三产品旋流器进行重介工艺洗选原煤为例,介绍了洗选原煤过程中严把介质质量关、降低介质损耗的措施,通过加强脱介系统的管理,提高了产品脱介效果。     

新洗选工艺的探索及TBS/3000干扰床分选机在田庄选煤厂的应用

针对田庄选煤厂选煤工艺存在的问题,提出采用新的洗选工艺,通过对粗煤泥分选工艺的探索及TBS/3000干扰床分选机的应用,优化了洗选工艺,提高了精煤产率,降低了介质消耗,提高了经济效益。     

一体式智能制浆系统的研制

为实现水利水电工程基础处理施工中有关浆液制备设备自动化,提高制浆站制浆效率,一体式智能制浆系统能够很好地完成制浆站全自动化制浆工作。该系统主要由集中入料口、制浆、储浆、送浆、计量以及PLC控制系统等多部件通过在一个集装箱内的合理布局组装而成的,具有高度集成和高自动化程度的完整制浆和送浆设备。     

跳汰洗选设备常见故障及处理方法

国家大力发展洁净煤技术,因此选煤技术需要不断提高.跳汰洗选是一种重要的洗选方法,本文讨论了洗选设备——空气脉动跳汰机、脱水设备和筛分设备的常见故障和处理方法。     

Markedness and its Interpretation in Language Use

Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.     

Features of Women's language

Language is a means of verbal communication. People use language to communicate with each other. In the society, no two speakers are exactly alike in the way of speaking. Some differences are due to age, gender, statue and personality. Above all, gender is one of the obvious reasons. The writer of this paper tries to describe the features of women＇s language from these perspectives： pronunciation, intonation, diction, subjects, grammar and discourse. From the discussion of the features of women＇s language, more attention should be paid to language use in social context. What＇s more, the linguistic phenomena in a speaking community can be understood more thoroughly.     

Characterization of Ordovician carbonate reservoirs, southeastern Saskatchewan, Canada

The discovery of the prolific Ordovician Red River reservoirs in 1995 in southeastern Saskatchewan was the catalyst for extensive exploration activity which resulted in the discovery of more than 15 new Red River pools. The best yields of Red River production to date have been from dolomite reservoirs. Understanding the processes of dolomitization is, therefore, crucial for the prediction of the connectivity, spatial distribution and heterogeneity of dolomite reservoirs.The Red River reservoirs in the Midale area consist of 3～4 thin dolomitized zones, with a total thickness of about 20 m, which occur at the top of the Yeoman Formation. Two types of replacement dolomite were recognized in the Red River reservoir: dolomitized burrow infills and dolomitized host matrix. The spatial distribution of dolomite suggests that burrowing organisms played an important role in facilitating the fluid flow in the backfilled sediments. This resulted in penecontemporaneous dolomitization of burrow infills by normal seawater. The dolomite in the host matrix is interpreted as having occurred at shallow burial by evaporitic seawater during precipitation of Lake Almar anhydrite that immediately overlies the Yeoman Formation. However, the low δ18O values of dolomited burrow infills (-5.9‰～ -7.8‰, PDB) and matrix dolomites (-6.6‰～ -8.1‰, avg. -7.4‰ PDB) compared to the estimated values for the late Ordovician marine dolomite could be attributed to modification and alteration of dolomite at higher temperatures during deeper burial, which could also be responsible for its 87Sr/86Sr ratios (0.7084～0.7088) that are higher than suggested for the late Ordovician seawaters (0.7078～0.7080). The trace amounts of saddle dolomite cement in the Red River carbonates are probably related to "cannibalization" of earlier replacement dolomite during the chemical compaction.     

低渗透非均质砂岩油藏启动压力梯度研究

理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。     

On Tragic Consciousness In The Works By Ernest Hemingway

As an American modern novelist who were famous in the literary world, Hemingway was not a person who always followed the trend but a sharp observer. At the same time, he was a tragedy maestro, he paid great attention on existence, fate and end-result. The dramatis personae's tragedy of his works was an extreme limit by all means tragedy on the meaning of fearless challenge that failed. The beauty of tragedy was not produced on the destruction of life, but now this kind of value was in the impact activity. They performed for the reader about the tragedy on challenging for the limit and the death.     

A computer generator for randomly layered structures

AcomputergeneratorforrandomlylayeredstructuresYUJia shun1,2,HEZhen hua2(1.TheInstituteofGeologicalandNuclearSciences,NewZealand;2.StateKeyLaboratoryofOilandGasReservoirGeologyandExploitation,ChengduUniversityofTechnology,China)Abstract:Analgorithmisintrod…     

An Index mechanism for multi-scale view in spatial databases

There are numerous geometric objects stored in the spatial databases. An importance function in a spatial database is that users can browse the geometric objects as a map efficiently. Thus the spatial database should display the geometric objects users concern about swiftly onto the display window. This process includes two operations:retrieve data from database and then draw them onto screen. Accordingly, to improve the efficiency, we should try to reduce time of both retrieving object and displaying them. The former can be achieved with the aid of spatial index such as R-tree, the latter require to simplify the objects. Simplification means that objects are shown with sufficient but not with unnecessary detail which depend on the scale of browse. So the major problem is how to retrieve data at different detail level efficiently. This paper introduces the implementation of a multi-scale index in the spatial database SISP (Spatial Information Shared Platform) which is generalized from R-tree. The difference between the generalization and the R-tree lies on two facets: One is that every node and geometric object in the generalization is assigned with a importance value which denote the importance of them, and every vertex in the objects are assigned with a importance value,too. The importance value can be use to decide which data should be retrieve from disk in a query. The other difference is that geometric objects in the generalization are divided into one or more sub-blocks, and vertexes are total ordered by their importance value. With the help of the generalized R-tree, one can easily retrieve data at different detail levels.Some experiments are performed on real-life data to evaluate the performance of solutions that separately use normal spatial index and multi-scale spatial index. The results show that the solution using multi-scale index in SISP is satisfying.     

Jane Eyre——A Feminist In The 19th Century

In the 19th century the society was controlled by men, and women were just appendants of them, they had not any rights and freedom. But Jane was an exception, she showed some characteristics of early feminist. Jane showed her characteristics of feminism in three aspects: rebellion, equality, and independence. These characteristics were helpful to her success, and feminism is the only way out for women of that time.     

Achieving Unusual States of Matter Under High Pressure

正The periodicity of the elements and the non-reactivity of the inner-shell electrons are two related principles of chemistry,rooted in the atomic shell structure.Within compounds,Group I elements,for example,invariably assume the+1 oxidation state,and their chemical properties differ completely from those of the p-block elements.These general rules govern our understanding of chemical structures and reactions.Using first principles calcula-     

Exchange-Correlation and Electronic Excitation Energies from Pairing Matrix Fluctuations

We have developed an adiabatic connection to formulate the ground-state exchange-correlation energy in terms of pairing matrix linear fluctuations.This formulation of the exchange-correlation energy opens a new channel for density functional approximations based on the many-body perturbation theory.We illustrate the potential of such approaches with an approximation based on the particle-particle Random Phase Approximation(pp-RPA).This re-