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DCS and ESD System Reconstruction of 300,000 Tons/year Ethylene Plant Boiler Water Treatment Devices

Author: WuXian
Tutor: YuanJingZuo；YaoLianJun
School: Shanghai Jiaotong University
Course: Control Engineering
Keywords: Petrochemical plant boiler feed water unit Preparation of pure water Automatic control Programmable controller WinCC
CLC: TQ221.211
Type: Master's thesis
Year: 2010
Downloads: 82
Quote: 0
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Abstract


Preparation of pure water is an important and indispensable part of the chemical production process, quality of pure water plays a decisive role in the production process. The task of the boiler feed water unit described herein (hereinafter referred to as pure water) production supply pressure boiler and ethylene cracking furnace and # 1 oil refining and other devices using a pure water and secondary water. Due to the high complexity and risk of the polymer produced water quality requirements are particularly stringent. , Design, reasonable, highly reliable, automatic control system to meet the process requirements to become an important part of ensuring water production. Shanghai Petrochemical Co., Ltd. 300,000 tons / year ethylene plant pure water preparation unit control system for the object, discusses the programmable logic controller (PLC) technology, field bus (Profibus-DP) communication technology and human-machine interface technology application in the field of water treatment. This paper describes the characteristics and control requirements of the process of the preparation of pure water, discusses the preparation of pure automation control system design, including hardware selection, network configuration, and monitoring system configuration, software design and other content. Petrochemical plants pure water preparation areas mainly include double efficient the floating bed desalination system (a desalination), a mixed bed refined system regeneration system, its operation process is more complicated, step-by-step sequence variety, high reliability requirements. Existing characteristics of the preparation of pure water equipment, the preparation of pure design automation control system selection SIEMENS S7-400 series PLC as controller, monitoring software development platform for the SIEMENS company WinCC V6.0 CPU master with the host computer WinCC V6.0 Industrial Ethernet communications, and distributed fieldbus Profibus-DP network CPU master I / 0 from the information transmission between stations, system control, centralized control room monitoring and on-site The operation of the combination of operating personnel on the CRT monitor screen can monitor and control the system operation. In addition, the system near the process equipment, local operation with remote control / manual transfer switch box, to facilitate the process of debugging and running before the device automatically put into operation after the failure of maintenance. Pure water preparation automation control system running results show that the system can meet the automation and control requirements of the petrochemical plant boiler feed water unit and has the advantages of high reliability, smooth operation, flexible control.

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CLC: > Industrial Technology > Chemical Industry > Basic Organic Chemistry Industry > The production of aliphatic compounds ( acyclic compounds) > Aliphatic hydrocarbons > Unsaturated lipid hydrocarbon > Monoolefins > Ethylene
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