Emerson Process Management recently announced it is updating the controls at a power station that provides electricity and steam to PetroChina’s Dalian Refinery, located in northeastern China’s Liaoning province. The refinery is expanding its operation, which will boost annual production capacity to 20.5 million tons, making it the largest refinery in China. Emerson will install its Ovation® expert control system at the captive power station, which is undergoing a comprehensive modernization as part of the complex’s overall expansion.
The power station, which is fueled by cracked gas and residual oil – byproducts of the refinery process – consists of three older 25-MW units controlled by outdated PLC control systems, as well as two newer 25-MW units that utilize Emerson’s previous-generation WDPF® distributed control system. There are three distinct phases to the control system project.
First, in September and October 2007, Emerson performed a WDPF-to-Ovation migration for the two newer units. From its inception, Emerson’s Ovation system was designed to allow a straightforward migration path for users of its WDPF systems. Emerson’s migration path allows WDPF customers to retain much of their investment by allowing them to keep existing I/O cards, field cabling, terminations and cabinets; as well as their system engineering investment in control logic, graphics and the database. This enables users, such as PetroChina Dalian, to increase the functionality of their control systems in a cost-effective way.
For the second phase of the project, Ovation was installed at the power station’s new auxiliary facility, which includes a deaerated water station, heating exchange station and condensed water station.
Emerson is currently in the third and final stage of the project, completely replacing the PLC controls in the older units with the Ovation system. Once this is accomplished, the power plant will be equipped with a fully integrated control solution utilizing Ovation technology. The Ovation system will perform data acquisition; monitor and control the sequence control system, water treatment control and furnace safeguard supervisory system; and interface to existing turbine controls.
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