Product category:
Fieldbus systems, Fibre-optic systems
News Release from: Emerson Process Management | Subject: 3420 and 848T
Edited by the Processingtalk Editorial
Team on 10 May 2006
Fieldbus additions to UK coal fired
power station
Foundation fieldbus based Rosemount transmitters and interface units will transmit data from over 500 temperature monitoring points on one of the boiler and turbine systems at Drax Power Station
Emerson Process Management has supplied Foundation fieldbus based Rosemount temperature transmitters and interface units to transmit data from over 500 monitoring points on one of the boiler and turbine systems at Drax Power Station, the largest, cleanest and most efficient coal fired power station in the UK The Emerson solution was chosen by Drax Power and Capula, the contractor undertaking the refurbishment, following presentations and demonstrations of interfacing the Rosemount 3420 fieldbus interface module to their Schneider PLC host system
This article was originally published on Processingtalk on 15 Oct 2008 at 8.00am (UK)
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Drax Power Station uses six steam boilers to generate up to 4000MW: at current output levels Drax supplies enough power to meet 7% of UK demand.
The main fuel used is pulverised coal, but Drax Power has developed the capability to burn alternative fuels such as biomass, to blend and burn with the coal.
The temperature sensors are mainly thermocouples used for monitoring the boiler tubes, superheater and re-heater, plus turbine and generator temperatures, in high density arrangements, to detect any irregularities or 'hot spots'.
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The monitoring thermocouples are linked individually to one of the 70 Rosemount 848T eight input temperature transmitters supplied on this project: the ambient temperature specification (up to +85C) of the 848T units allows them to operate accurately in the existing cabinets located in the high temperature environment around the boiler.
Up to 13 of the Rosemount 848T units can be powered from one Foundation fieldbus segment, transmitting the temperature measurements from up to 104 sensors along two wires.
The link between the site fieldbus segments and the host PLC system is provided by seven Rosemount 3420 fieldbus interface modules: these each power up to four separate Foundation fieldbus segments and retransmit the data over a Modbus RS485 serial connection.
The Rosemount 3420 unit also provides an Ethernet port for separate connection of a supervisory PC, which can be used to configure the unit, as needed for example when a sensor is changed.
It also allows access to the diagnostic data available over the fieldbus which monitors the sensor and transmitter performance.
While providing Drax Power with a neat and accurate system solution, the extra capabilities of the Rosemount 3420 will allow further investigation of any unusual heat patterns during tests of alternative fuels and firing systems.
It will also reduce the complexity and time needed for the rewiring task on the current retrofit.
Once installed, the availability of Foundation fieldbus segments around the boiler will allow the addition of further test equipment or other sensors for plant condition monitoring, with relatively simple configuration to transmit the data back to the supervisory systems, and no extra wiring. Request a free brochure from Emerson Process Management ...
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