Long thermocouple sensors aid green electricity
An
Ametek Calibration Instruments product story
Edited by the Engineeringtalk editorial team
May 23, 2007
Energi Randers Production commissioned 6m long versions of AMK thermocouple assembly sensors for use in the production of "green" electricity and heat by burning biomass
In support of current efforts to reduce carbon emissions, FP Temperature Sensors has manufactured 6m long versions of its AMK thermocouple assembly sensors for use in the production of "green" electricity and heat by burning biomass.
The sensors were commissioned by Energi Randers Production, suppliers of electricity heating and water in Randers, Denmark, following close co-operation with Ametek Calibration Instruments.
The sensors are supplied with a steel protective tube and an interchangeable ceramic inner tube and are used to monitor temperatures of around 1200-1300C in two boilers as part of a new flux firing system.
They conform to standard class 2 according to IEC 584 thermocouple type N.
The sensor is mounted through the top of the furnace to a depth of approximately 700mm.
The biomass used comprises olive cores and meat and bone meal.
Temperature control is critical in the process since the biomass must be ignited so that it burns at once to avoid possible gas explosions.
In addition, a high temperature is required to ensure that any spores or bacteria from the fuel mass are destroyed and that any dioxin resulting from the process is completely burned.
The fuel enters the two boilers on a conveyor belt to ensure continuous combustion.
More than 100 tons of biomass is burned per 24 hours.
Each boiler is equipped with two of the special sensors, and a spare was supplied for use when a sensor is re-calibrated.
The sensors were factory calibrated and will require only annual recalibration.
In view of the length of the sensors, a system has been devised to allow the sensors to be exchanged for recalibration while the boiler continues to operate.
The FP industrial temperature sensor product line includes a comprehensive range of thermocouple assemblies and resistance thermometers, measuring inserts, thermocouples (of precious as well as base material), thermocouple wire, extension wire, temperature transmitters and portable digital thermometers.
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