增湿塔自动控制系统的设计.docVIP

学 号：201001010125  HEBEI UNITED UNIVERSITY 毕业设计说明书 GRADUATE DESIGN 设计题目：增湿塔自动控制系统设计 学生姓名：张璞 专业班级：101（卓越班） 学 院：电气工程学院 指导教师：王福斌 副教授 2014年 6月 1日 摘 要 当今的水泥干法回转窑生产中，窑尾的废弃排放量比较高。对含有超标粉尘的窑尾废气进行治理的最有效的方法是使烟气通过电除尘器或袋式收尘器进行收尘处理。在入收尘器之前一般需要对延期进行降温预处理，而由于烟气的干燥和高温，粉尘比电阻较高，烟气在通过高压电场过程中粉尘不容易电离，从而影响除尘效果。但就目前环保除尘技术而言无论是电除尘器还是袋除尘器,均无法对此类烟气直接进行高效收尘只有通过改变含尘气体的温度和湿度或粉尘的带电性质，才能使除尘设备对此类烟尘有高效收尘能力，净化后的气体才能达到《水泥工业大气污染物排放标准》的要求。改变烟气性质的手段或方法称为烟气调质，其目的就是改变高温含尘气体的温度和湿度，调节粉尘的比电阻，使其满足后续除尘设备的进气要求，可选用不同的设备对高温含尘气体进行烟气调质，主要采用增湿塔、多管冷却器、冷风阀和管道增湿等几种烟气调制技术。 我国第一台增湿塔于1970年在太原水泥场进行了使用，现在全国的新型干法水泥窑尾基本上都使用了增湿塔，并对提高除尘器的性能起着积极的作用。且在除尘器前使用增湿塔对高温烟气进行增湿降温处理也是目前最普遍的做法。 关键词：增湿塔；干法水泥窑尾；除尘 Abstract The dry process rotary kiln cement production, waste emissions kiln is relatively high. The most effective method for treatment of waste gas of kiln tail dust containing exceed the standard is to make the flue gas by electrostatic precipitators or bag type dust collector for dust collection. Before entering the collector requires cooling pretreatment on the extension, the main reason is the first stage barrel outlet flue gas temperature at 330 ± 30 ℃, but due to the drying and high temperature flue gas, dust resistance is high, the flue gas in the high voltage electric field in the process of the dust is not easily ionized, thus affecting the dust removing effect. Change means or method of flue gas is known as the flue gas conditioning, its purpose is to change the high temperature dust containing gas temperature and humidity regulation, dust resistance, which can meet the following requirements of air dust removal equipment, can choose different equipment for high temperature dust in gas flue gas conditioning, mainly uses the humidifying tower, multi pipe coolers, cold air valve and pipeline humidifying several flue gas modulation technology. Chinas first humidification tower in 1970 in Taiyuan cement field was used, and now the countrys new dry process cement kiln tail basically use humidifie