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  4. Directly inserted oxygen probes
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EUROX® Measurement-Systems

DIRECTLY INSERTED OXYGEN PROBES

GENERAL

EUROX® oxygen sensors for direct insertion are based on a zirconium oxide measuring cell, which measures against reference air from a reference air unit. Together with an active ceramic diffusion block the inner and outer protection tube effect a maximum protection of the inner components.

BENEFIT

With an EUROX® measuring system for directly inserted probes the oxygen content in flue gas can be measured reliable and therefore a reliable feedback about the state of combustion is received. In this way, combustion can be optimised, energy can be saved and emissions reduced.
In addition, fluctuations in the heating value can also be detected and thus compensated, resulting in safe furnace operation.

APPLICATION

EUROX® REG-System for regenerative end fired (EFF) and cross fired (CFF) furnaces is intended for a reversal of the firing side of the furnace. Short reaction times are realised through adapted construction.

EUROX® system type REG-EFF includes two sensors, for each regenerator chamber one, a reference air unit including all necessary parts for controlling, evaluation and visualising and all required piping between reference air unit and sensors.

The EUROX® REG-CFF-System includes the required number of sensors and one reference air unit for each regenerator chamber. All necessary parts for controlling, evaluation and visualising of the measurement of one side as well as all required piping between reference air unit and sensors is included. The main unit for visualising and controlling the whole measurement system can be one of the two reference air units, but also an additional main unit.

EUROX® system R-O for recuperative and oxyfuel furnaces is the best solution for furnaces without reversal of the firing side. The spotlight in the construction was a maximum protection of the measuring cell.

EUROX® R/O-System includes the required number of sensors, for each flue gas duct one oxygen sensor is recommended. A reference air unit including all necessary parts for controlling, evaluation and visualising and all required piping between reference air unit and sensors is included.

EVALUATION

Visualisation of System type REG and System type R/O can be done via visualisation unit of OM-4 and via PLC. Evaluation can be done via OM-4 or via PLC in case of a HORN SCADA system.  Adapted to the application and number of probes, all evaluated values are presented.

The following evaluations can be offered:

SENSOR TEMPERATURE IN °C, CELL VOLTAGE IN mV

  • Standard values of the measurement
  • Output from sensor

MEASURED OXYGEN CONTENT IN %

  • Actual measured oxygen content, based on Nernst equation
  • Basis for measurement evaluation

RATIO REAL

  • Real air/fuel gas ratio, including false air

FALSE AIR IN %

  • False air in furnace
  • Input from PLC needed

FLUSHING OBSERVATION

  • Monitoring of the reversing process to detect any malfunctions

MEMORY MODULE

  • Internal memory that gives the measurement a memory to detect long-term trends or drifts and to compare the current readings with values from the past

LAMBDA

  • Lambda value of the actual combustion condition

CO IN PPM

  • CO concentration based on combustion

O2 TREND VALUE IN %

  • Theoretical value after complete settling of the measurement at the end of the firing time.

SELF-CHECK MODULE

  • Various internal checks and monitored values to prevent malfunctions of the measuring system

Both systems are available as a stand-alone and add-on system to a HORN SCADA system and can be offered as purchase offer or rental- and service.

FEATURES

  • Protection of measuring cell through diffusion block
  • Stable structure due to special design
  • Lifespan up to six years depending on conditions
  • Operating temperatures up to 1500 °C (2730 °F)
  • Fast installation
  • Direct measuring of the oxygen content in the flue gas
  • Evaluation of the measurement using various output values: O2 content in %, Lambda value, Real Ratio, False air in %, CO content in ppm and flushing observation of the chamber

 

CONTACT

Do you have any questions? Then please do not hesitate to contact us.

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