摘 要
备浆流送部是抄纸过程的一个重要工段，涵盖从纸浆车间的成浆池到网部的流浆箱唇口之一段，是制浆工段和抄纸工段的连接枢纽，属于抄纸过程的准备阶段。其主要功能包括纸料的输送、筛选、稀释、冲浆上网等。在制浆造纸过程中，这一阶段的控制往往作为纸机DCS控制系统的一个独立子系统。其主要任务包括浆料的浓度调节、流量调节、浆池液位调节、流浆箱的控制相关泵的联锁控制等。 本设计首先对备浆流送工段的工艺做了介绍，并明确了控制对象和控制参量，之后根据工艺的要求，设计了适合工艺的控制系统，并对照工艺流程图进行了控制点的配置、I/O点数的统计、模块的选择和相关仪表的选型。本文中详述了工艺流程，因为工艺流程是控制方案选定的基础和前提，之后对控制方案进行了详述，并对控制系统的硬件进行了选型和配置。随后介绍了西门子PLC控制系统和WinCC组态软件。 本次设计的难点是流浆箱的液位和总压的耦合问题以及四段除砂器浆泵及阀门的连锁和时序启停问题，针对上述问题，本文中给出了相应的解决方案。
关键词：备浆流送，控制系统，PLC，硬件组态
Control System Design of Preparing and Flowing Section for Kraft Paper Machine
ABSTRACT
Preparing and flowing section is important in paper making process. It covers sections from the pulp slurry pool to the workshop of the head-box lip, which belongs to the paper making process preparation stage is the connection hub of pulping and paper making section,. Its main function includes conveying, screening, dilution, slurry punching network. In papermaking process, the DCS control system for this stage of paper machine is often used as an independent sub-system. Its main tasks include pulp concentration regulation, flow control, plasma pool level adjustment, head-box control and pump interlock control.
This design introduced the process of preparing and flowing at first, and clearly described
the control object and control parameter, then according to the process requirements, design the process control system, and the control process flow chart for the control point c
onfiguration, I/O point statistics, module selection and the selection of instruments. This design introduces the technological process detailedly, because the process is the basis and premise of control program, then explain the control scheme、the control system hardware for the selection and configuration in detail. Subsequently introduced Siemens control system PLC and WinCC configuration software.
This difficulty in this design the head-box level and total pressure’s coupling problem and issues of pump and valve linkage and sequential start-stop for four sections of the desander , in view of the above problems, this paper presents corresponding solutions.
KEY WORDS:Preparing and Flowing, Control system, PLC, Hardware Configuration
目 录
摘 要 I
ABSTRACT II
1 绪论 1
1.1 本课题的背景、目的及意义 1
1.1.1 课题背景 1
1.1.2 课题目的 1
1.1.3 课题意义 1
1.2 备浆流送部控制在国内外的现状 1
1.3 本课题的主要工作和任务安排 2
1.3.1 本次设计的主要工作 2
1.3.2 本次设计的内容安排 2
2.1 备浆流送部的定义及其主要功能 3
2.1.1 备浆流送部的定义 3
2.1.2流送系统的主要功能 3
2.2 备浆流送的工艺 3
2.2.1 浆量的调节 4
2.2.2 液位控制 4
2.2.3 浆料的稀释 4
2.2.4 浆料的除气 5
2.2.5 纸浆的筛选和净化 5
2.3 备浆流送系统的典型设备简介 6
2.3.1 流浆箱 6
2.3.2 旋翼筛 7
2.3.3 锥形除渣器 8
3 PLC介绍 9
3.1 PLC的定义、特点及功能 9
3.1.1 PLC的定义 9
3.1.2 PLC的优点 9
3.1.3 PLC的主要功能 9
3.2 PLC的硬件组成和工作原理 10
3.3 PLC的工作原理 12
3.4 PLC的I/O模块和外围设备 14
3.4.1 数字量输入模块 14
3.4.2 数字量输出模块 15
3.4.3 模拟量输入模块 15
3.4.4 模拟量输出模块 17
3.5 CPU模块 17
3.6电源模块 18
3.7其他模块 18
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