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Seawater Desalination Plant Operates at Maximum Efficiency

PlantPAx process control system from Rockwell Automation helps Soreq Desalination Project set new performance benchmark in terms of output and costs

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Challenge

  • The Soreq desalination plant needed a control system that catered for the cost-conscious water industry, which at the same time delivered increased performance, safety and efficiency

Solutions

  • PlantPAx process automation system
  • Redundant Control System
  • Plant system connected through an EtherNet/IP ring network topology
  • Flex I/O-XT™ (Extreme Environment)
  • High end centralised control & information

Results

  • Significantly reduced engineering expenditure
  • Increased productivity
  • Favourable output vs. cost figure

Background

Water shortages due to drought are one of the main problems that preoccupy many countries – Israel in particular. In 2013, the country experienced one of its most severe droughts in decades. Droughts will soon become much less of an issue however, thanks to a huge infrastructure project.

A desalination master plan, launched in the year 2000 by the Water Desalination Administration (WDA), an Israeli Governmental agency, aims to provide some 650 million cubic meters of treated water per annum by the year 2020. The plan involves the construction of large-scale seawater plants along the Mediterranean coast. One such plant is the Soreq Desalination Project, which has been designed to provide for 10% of the country's drinking water consumption and about 20% of its domestic water consumption.

The Soreq plant, located south of Tel Aviv, offers a capacity of 624,000 m³/day, which makes it the world's biggest seawater desalination plant. At the heart of its operations is a PlantPAx® process control system from Rockwell Automation, which leverages a number of advanced process control solutions and peripherals in conjunction with over 11,000 I/O points.

Challenge

The challenge of these installations is to not only produce potable water, but also to produce it efficiently and with as little impact as possible on the environment. The scale of this plant and its mode of operation demand a single control platform that is capable of commanding complicated and diverse process and automation facilities, sometimes from multiple vendors and often with very different demands.

Because the water industry is highly cost driven, engineering expenses also have to be very tightly managed without sacrificing efficiency. As much engineering effort as possible has to be reusable over many systems; this means code reuse has to be maximised and code writing minimised. As a result, the plant operated by the Soreq Desalination Company (SDL) is not only the largest of its kind in the world, but arguably, it is also one of the most engineering efficient and advanced.

Solution

The new desalination facility uses seawater reverse osmosis (SWRO) to provide water to Israel's national water carrier system. The desalination process sits in the middle of the treatment cycle; it is preceded by filtration and chemical dosing and is followed by re-mineralisation and final disinfection. The plant is comprised of two primary stages for desalination, each with its own instrumentation and control solutions. One stage creates water of the highest level for consumption, while the other creates water of a quality level suitable for industrial and commercial use.

Project development, engineering, programming, configuration and commissioning for the Soreq desalination plant was undertaken by Contel Automation & Control, a company which specialises in the supply of equipment and systems in industrial automation, air conditioning, refrigeration facilities control, building control systems and process control.

The foundation of the plant's control infrastructure – the PlantPAx process control system from Rockwell Automation – oversees some 11,000 I/O points. Contel Automation & Control deployed the PlantPAx process system as its programmable automation controllers offered increased speeds and could cater to multiple communication connections, which removes the need to split controllers. These savings were also realised by the company that undertook the construction of the facility – fewer controllers means less hardware, which means less wiring and engineering.

The PlantPAx process control system leverages extensive software packages and process libraries to provide a fully integrated architecture environment. This approach provides efficient and individual control of each of the primary redundant controllers, as well as optimising the software development process due to extensive libraries, add-on instructions for the controllers and process equipment and the ability to share code.

A closed-ring EtherNet/IP™-based communication architecture was adopted, as it offered increased safety and efficiency. If one communication line fails or is damaged, a backup is always available on a different path. Specific Allen-Bradley® I/O modules were also chosen for their embedded EtherNet/IP capabilities and their resilience to the elevated environmental temperatures. Since most of the equipment is located near the sea, where elevated levels of humidity and salt are present, many of the primary modules were treated with conformal coating.

PlantPAx operator workstations (OWS) provide a fully customised way to communicate with selected process areas and allow direct access to each controller's data points. This approach within a desalination plant system delivers many advantages. First, it streamlines the work of the controllers due to the lack of duplicate settings, allowing high working speeds; second it can considerably reduce errors; and finally it can help to increase reliability and safety at the facility.

“After a lengthy review process, we chose the process control solution of Rockwell Automation, with its emphasis on a central process control system, which is at the forefront of technology,” explains Jacky Ben Yaish, Engineering Manager IDE Technologies.

Results

The Soreq desalination plant began working at full capacity in October 2013, providing 624,000 m3 of water per day (with preparations for future expansion). The facility immediately set new performance benchmarks for output and costs as a result of its use of advanced membrane desalination technology. Additionally, with the PlantPAx system, SDL was able to reduce engineering and infrastructure investment costs, reduce energy consumption and increase productivity. SDL also took significant steps to reduce the environmental impact both on the land and in the sea.

“Thanks to the scalable PlantPAx control system from Rockwell Automation, and Contel's involvement in both the planning and implementation stages, we were able to implement the project successfully, without deviation from the budget. The process control system was built using modular object libraries, and was developed with the vision of future needs and upcoming projects of IDE Technologies,” Jackie Ben Yaish concludes.

Published 21 October 2015

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