instrumentation & control

Emerson automates China’s Haimen coal fired plant...

1 January 2009

Emerson has received a contract from Huaneng to provide Plantweb digital plant architecture at Haimen, a 6 x 1036 MW ultrasupercritical coal-fired power plant under construction in Guangdong.

The plant is being built in two phases (four units in the first phase, two units for the second). Under the contract, Emerson will install its Ovation expert control system for units 1 and 2, which are expected to go into service December 2008 and March 2009, respectively. Emerson has also entered into a purchase agreement with Huaneng Group to automate units 3 and 4.

The Emerson scope will also include AMS Suite predictive maintenance software, as well as intelligent field devices, including Rosemount 848T temperature transmitters and 3051 pressure/level transmitters.

For units 1 and 2 Ovation will monitor and control the boiler sequencing system, electric control system, modulating control system, furnace safeguard supervisory system, FGD system and balance-of-plant processes. The Ovation system will also provide feedwater pump electro-hydraulic control and interface to the Dongfang turbine controls as well as to PLCs controlling soot blowing, dust removing, ash and slag handling, and plasma ignition.

The integrated Ovation solution will unify boiler and turbine operations, which translates into a number of significant operational benefits. Fully co-ordinated boiler and turbine control not only enhances unit-wide compatibility, but also contributes to improved unit stability, responsiveness and thermal efficiencies; tighter overall control of plant operations; and a more streamlined view of key plant and turbine parameters.

The contract for units 1 and 2 calls for the supply of a total of 64 Ovation redundant controllers (32 per unit), 10 operator stations (five per unit) and four engineering stations (two per unit). In all, the Ovation system will manage 28 044 hard I/O points (14 022 points per unit) and will incorporate 12 Foundation fieldbus segments (six per unit) and 16 PROFIBUS DP segments (eight per unit), to network 174 Foundation fieldbus devices (87 per unit) and 154 PROFIBUS DP devices (77 per unit). Use of Emerson’s AMS Suite predictive maintenance software will initially streamline configuration of these intelligent devices, translating into cost savings and increased unit startup efficiency. On an ongoing basis, AMS Suite technology will further increase the availability and performance of the two units by providing online access to instrument and valve process information, predictive diagnostic information, and automatic documentation of field device maintenance information – all of which contribute to ongoing efficiency of plant operations and maintenance activities.

Emerson’s Ovation control system is already utilized by a number of plants owned by Huaneng – Taicang, Luohuang and Yuhuan – to name but a few, and Emerson says it has won contracts to install its automation technologies at around twenty 1000 MWe units in China, reporting that Ovation “has already been selected to automate the majority of 1000 MW units in China.”

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