【作者】 石磊；

【导师】 方跃法；

【作者基本信息】 北京交通大学 ， 机械设计及理论， 2008， 硕士

【摘要】 选煤厂是煤炭生产企业和火电厂的重要生产环节,其作用是将原煤通过筛分设备、破碎设备处理后,利用皮带转运设备将其输送到所需工艺位置。干燥的煤炭在转移运输过程中,由于冲击、下落、振动等原因,产生大量的粉尘。目前,由于没有安装有效的除尘装置以及现有除尘系统在设计方面存在很多不足。我国大部分选煤厂粉尘排放严重超标。一般来说,没有改造过的选煤厂,其岗位粉尘含量高达200-4000mg/m~3。针对这一工程实际问题,通过对相关企业的调研,本研究对选煤厂中粉尘产生机理、扩散规律及控制技术进行理论分析和数值模拟;并提出以除尘器为主要设备的粉尘治理综合方案,并对其风量、安装位置等工艺参数进行工程设计,以实现对粉尘的最优化控制。针对现场环境复杂,工作条件恶劣的特点,结合远程监控技术和PLC技术,本研究设计以工业以太网光纤冗余环网为组网形式的远程自动监控系统。以工控组态软件MCGS为平台,构建选煤厂除尘器上位机监控系统。通过友好的人机界面,对现场分散的除尘设备进行远程操作和运行状态监控。综上所述,本研究成果是一套包括设计、分析、工业自动化、上位机监控在内的综合性应用技术,应用本技术不但可以使粉尘污染严重的选煤厂粉尘排放达到国家标准,而且可以实现对现场分散的除尘设备进行远程操作和运行状态监控。最后,本文根据设计结果搭建了实际实验系统,通过测试,系统运行稳定可靠,达到了最初的设计初衷。更多还原

【Abstract】 Coal washery is an important manufacturing process of the coal enterprises and steam power plant. Its function is to transport the raw coal, which has been disposed by screening and crushing machinery, to required craft position by the belt transport equipment. Owing to the deficiency of effective dust removal machine and the defect of dust removal system in existence, great amount of dust are produced in the dry coal transiting process because of impaction、falling and vibration. For the moment, the discharges of dust in coal conveyance system of our country exceed the stipulated standards seriously. Generally speaking, a coal washery without reconstruction contains a dust amount as high as 200-4000mg/m~3.Focusing on this practical engineering problem and by researching on some relative enterprises, this article intends to describe the dust generation mechanism, diffusion rules, control technology of dust by means of theoretical analysis and numerical simulation in coal washery, and put forward a comprehensive plan of dust control which takes bag filter as main dust removal equipment, and make an optimal design of air delivery and positioning, to realize the optimal control of dust.Considering the complex local environment as well as the bad working conditions and combining with remote surveillance techniques and PLC techniques, this research designs an automatic monitoring system which takes industrial Ethernet as networking form. Moreover, it designs an upper monitor control system for filter based on MCGS (Monitor and Control Generated System) software. Through user-friendly interfaces, the system monitors the remote operation and running state of the dispersed dust removal equipments.Conclusion demonstrated that the research achievements in this paper provide a set of synthetical application which includes design, analyses, industrial automation and upper-supervision. Application of this technology can not only enable seriously polluted coal preparation plant reach national emission standard, but also can realize remote operation and status monitoring of on-site dispersed dust removal equipment. Finally, a practical experimental system is put up in this paper and the system is proved to be reliable and stable through the field tests. The original design intentionof this paper is fulfilled.更多还原