本科电气毕业论文.doc

摘 要 MPS型中速磨煤机是目前电力、冶金、建材、化工等行业的主要制粉设备。磨煤机的型式很多，按磨煤工作部件的转速可分为三种类型，即低速磨煤机、中速磨煤机和高速磨煤机。为了改进我国中速磨煤机落后的局面，我国从20世界末先后从发达国家引进了各种系列的中速磨煤机，并且积极研究国外的先进的机器，在引进消化吸收的基础上，经过几十年的努力，我国生产出国产的中速磨煤机，并且各项指标已经符合国际的要求，生产水平得到了很大的提高。 近几年来我国的中速磨煤机的可用系数、运行系数逐年提高，并且中速磨煤机的可用系数、运行系数均高于低、高速磨煤机。近几年，随着大容量火电机组的不断投运，中速磨煤机的使用越来越多，中速磨煤机初期投资费用小，磨煤电耗低，低负荷运行时，单位耗电量增加不多，已成为大型火电机组配备磨煤机的首选方案。 本文首先介绍了MPS磨煤机的发展状况和使用情况及PLC软件的介绍，然后通过MPS140轮式磨煤机液压控制系统的流程图，应用PLC软件，使之能够实现液压系统的压力测量与控制，能够实现液压控制系统的温度测量与控制，能够实现液压控制系统的手动,自动，中空及连锁控制，并且该系统具有故障报警功能，实现对MPS140轮式磨煤机液压控制系统的控制。 关键词：磨煤机；PLC；液压控制 Abstract MPS pulverizers type is electricity, metallurgy, building materials, chemical industry, major milling equipment. Mill type many working parts of coal by grinding speed can be divided into three types, namely low-speed mill, pulverizers and high-speed mill. In order to improve our situation in backward pulverizers, the end of our world from 20 countries have introduced a variety of series from the medium-speed coal mill, and actively study the advanced machines, the introduction and absorption, based on After decades of efforts, Chinas domestic production of medium-speed coal mill, and the indicators have been in line with international requirements, the production level was much improved. In recent years our available factor pulverizers, run coefficient gradually increased, and the coefficients can be used pulverizers, run coefficients are higher than the low, high-speed mill. In recent years, large-capacity thermal power units with the constant put into operation, the increasing use pulverizers, pulverizers initial investment cost of small, grinding coal consumption is low, low load operation, the unit consumption consumption are very low, has become a large-scale thermal power with the first choice mill. This paper introduces the MPS mill usage and development and introduction of PLC software, to enable the pressure of hydraulic system measurement and control, hydraulic control system enables temperature measurement and cont