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Optimized manufacturing with networked DCS system at naphtha cracking plant

業種 製造オートメーション
関連製品 EDS-305/308 シリーズ
EDS-316 シリーズ
EDS-728 シリーズ
概要 FPCC (Formosa Petrochemical Corporation), which is one of the largest petrochemical groups in Taiwan, has developed several commercial petroleum-related plants that require heavy industrial development. The “No. 6 Naphtha Cracking Project” in Mailiao on the west coast of Taiwan involved reclaiming land from the sea, designing a sophisticated foundation, and construction of an oil refinery plant with annual capacity of 21 million tons of crude oil, naphtha cracking plants that produce 1.735 million tons of ethylene per year, a thermal power plant that can output 3 million kilowatts of energy, and other petrochemical plants.
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Introduction

FPCC (Formosa Petrochemical Corporation), which is one of the largest petrochemical groups in Taiwan, has developed several commercial petroleum-related plants that require heavy industrial development. The “No. 6 Naphtha Cracking Project” in Mailiao on the west coast of Taiwan involved reclaiming land from the sea, designing a sophisticated foundation, and construction of an oil refinery plant with annual capacity of 21 million tons of crude oil, naphtha cracking plants that produce 1.735 million tons of ethylene per year, a thermal power plant that can output 3 million kilowatts of energy, and other petrochemical plants.


A naphtha cracker is a plant that uses a “cracking process” to produce ethylene from naphtha. The major control problem associated with naphtha crackers is to regulate the conditions in the cracking process to control the ethylene output. One of the many challenges faced by the designers of FPCC’s “No. 6 Naphtha Cracker” in Taiwan was creating an extra-reliable Ethernet network for transmitting important control and device management signals. The network serves as the main communications medium for the plant’s DCS (distributed control system).


 

 

System Description

The DCS used for controlling the main processes at the No. 6 Naphtha Cracker is made up of several subsystems for handling different parts of the operation. The central IT room, for example, contains LCD monitors for displaying the HMI/SCADA system, has a number of work stations for data processing, plus a data server for controlling and monitoring I/O controllers located at a remote site.

In order to optimize the manufacturing output from the Naphtha Cracker, the conditions in the cracking process need to be monitored and controlled. Remote I/Os are typically used to connect DI/DOs or AI/AOs, temperature modules, and motors to detect temperature, pressure, humidity, and other important sensors and actuators. In addition, controllers are connected to remote I/Os and motor servers to maintain better control of the process. In order to set and adjust parameters on-site, control panels are located in the field to allow engineers to control or check information directly.


As is the case with most sophisticated industrial control systems, the DCS at the No. 6 Naptha Cracker must maintain normal operation 24 hours a day, 7 days a week to keep production running smoothly. The system designer adopted Ethernet as the main communication network for the entire DCS. Eight sets of MOXA EDS-726 modular Ethernet switches are applied to form a doubly redundant fiber network backbone with dual-tree topology for better reliability. The EDS-316-MM-SC and EDS-308-MM-SC are 16- and 8-port unmanaged Ethernet switches that are used to form the communication network between the system backbone and terminal devices that have an Ethernet interface.


There are two parallel but independent Ethernet networks, with each network device connected to both networks (e.g., each workstation has two network cards). In addition, the entire array of workstations and devices is duplicated; at any given time, one set is “hot” and the other set is “cold.” When a device in the “hot” set fails, the “cold” set springs into action, taking over operation until the other set is repaired.


MOXA’s EDS switches are available with a variety of fiber and copper port combinations, and the reliable industrial-grade quality of the switches helps users maintain a reliable gigabit backbone and communication network for synchronizing data exchange and optimizing the manufacturing output. DCS systems formed with MOXA’s EDS switches improves manufacturing productivity and helps users achieve a competitive advantage.


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