DCS在长纤组机（分选机）起停的应用

论文编号:ZD825    论文字数:28650,页数:61

摘要
 现今，资源的回收利用变的尤为重要。在企业中，生产纸张以通过废纸回收生产的方式逐步代替对木材的加工生产，达到资源的再利用。从而引进了各项技术以实现除渣（包括重渣、粗渣、细渣等）和提浆，通过碎浆机，粗筛、细筛系统以及分选机的筛选和多盘长纤维磨机、短纤维磨机，以此达到生产中所需要的浆液浓度。
 本设计，主要是通过DCS控制整个制浆工艺来实现对现场除渣的开关起停的控制，杂质分选机具有无振动、磨损小、全封闭的特点，一般用来处理粗筛过来的杂质，以达到杂质的收集目的，并可以应用于处理二次纤维，纸机流送系统和浆厂筛选系统，通过传感元器件与阀门，能够在DCS控制系统中准确反映其运行状态。DCS系统通过对PLC程序的控制，PLC控制器进行电动机、电磁阀的联锁和控制，从而对分选机的运行与停止状态的起到监视控制作用，使纸浆达到合理的利用。
 关键词：DCS控制;PLC编程;分选机;除渣系统.
 
  
 Abstract
 Nowadays, the recycling of resources is becoming particularly important. In the enterprise, the production of paper is more depending on the way of recycling the waste paper, which gradually replace the old way that is mostly manufactured with timber, by that new means can they reuse the resources. Thereby they bring in a variety of new techniques to realize slag removal (including heavy dregs, thick dregs, thin dregs and so on) and abstraction of pulp, with the application of pulp kneader, coarse sift and is lender sift system as well as separator’s filtration and multiple-disc long fiber grinding machine short fiber grinding machine , they can get the required concentration of pulp .
 This design is mainly controls the entire pulping craft through DCS, realizes to the scene eliminates the control which the dregs the switch gets up stops, key research control impurity separator''s control. Whether there is do the impurity separation machines and tools vibrate, wear slightly, the entire seal characteristic, generally uses for the impurity which processes the coarse screen to come, achieves the impurity the collection goal, and may apply in processes two times the textile fiber, the paper machine class delivers the system and the thick liquid factory screening system, through the sensing element and the valve, can reflect its running status accurately in the DCS control system. The DCS system through to the PLC procedure''s control, the PLC controller carries on the electric motor, solenoid valve''s interconnection and the control, thus plays the supervisory control role to separator''s movement and the stopped state, enables the paper pulp to achieve the reasonable use.
 Key word: The DCS control; PLC the Programming; the Separator; Dreg Removal system.

目录
摘要……………………………………………………………………………Ⅰ
第一章 绪论:
 1.1  研究的目的及意义………………………………………………………………1
  1.2  国内外同类研究状况……………………………………………………………1
  1.3  纸的发展历史和未来的展望……………………………………………………1
第二章 制浆
 2.1制浆造纸生产的控制要求……………………………………………………… 3
 2.2制浆中的DCS控制系统………………………………………………………… 4
第三章 造纸
 3.1造纸流程…………………………………………………………………………9
 3.2纸机传动控制……………………………………………………………………12
 3.3纸机过程过程控制………………………………………………………………12
第四章 制浆系统
   4.1废纸的制浆技术…………………………………………………………………12
   4.2废纸制浆工艺……………………………………………………………………15
 4.3碎浆系统…………………………………………………………………………15
    4.3.1水力碎浆机…………………………………………………………………16
  4.3.2水力清杂机…………………………………………………………………16
  4.3.3高浓除砂器…………………………………………………………………17
 4.4粗筛系统………………………………………………………………………… 17
   4.4.1粗筛…………………………………………………………………………18
   4.4.2浮选清杂机…………………………………………………………………18
   4.4.3杂质分选机…………………………………………………………………19
 4.5中浓系统………………………………………………………………………… 20
 4.6精筛系统………………………………………………………………………… 20
 4.7开关机程序…………………………………………………………………………23
第五章 分选机与DCS
 5.1分选机………………………………………………………………………… …23
   5.2 DCS控制系统…………………………………………………………………… 28
   5.3 PLC………………………………………………………………………………  33
   5.4 DCS控制系统与PLC关系……………………………………………………… 36
   5.5 PLC控制程序…………………………………………………………………… 41
总结…………………………………………………………………………….59
致谢………………………………………………………………………… …60
参考文献……………………………………………………………………….61