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Furnace Atmosphere Control

What is it? Used to case harden steel Function of Temperature & Carbon Potential Requires sychronised programming of both parameters. Who uses it? Furnace OEM’s Specialist heat treaters Various industries including Automotive Aerospace Shipbuilding Toolmaking.

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Furnace Atmosphere Control

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  1. What is it? • Used to case harden steel • Function of Temperature & Carbon Potential • Requires sychronised programming of both parameters • Who uses it? • Furnace OEM’s • Specialist heat treaters • Various industries including • Automotive • Aerospace • Shipbuilding • Toolmaking Furnace Atmosphere Control

  2. Ideal For: • Temperature profiling • Carbon potential • Furnace dewpoint • ReDox atmosphere • Combustion control • Used in: • Carburising furnaces • Endothermic generators • Ceramic kilns • Glass furnaces • Boiler plants 26/2704 Zirconia Controller

  3. Zirconia cell Outer electrode Electrode and thermocouple connections Self clean port Air from inside furnace Inner electrode Air from outside furnace Air from inside furnace Furnace wall Thermocouple Zirconia Probe Assembly Zirconia Probe E=0.0215*T*Ln(0.2095/pO2 E= Probe EMF(mV) T= Probe Temperature(Kelvin) pO2= Partial pressure of oxygen in the furnace 0.2095= 20.95%(Partial pressure of oxygen in reference air

  4. Zirconia Block PV Output Zirconia Probe Sooting Alarm Temperature Probe Alarm Probe mV Gas Reference Probe Clean Probe Clean Demand Zirconia Function Block • Most Probes Supported • Drayton, SSI, Marathon, AACC, Bosch, etc • %Carbon, Oxygen(log or PPM), Dewpoint • Automatic gas reference compensation • Probe Clean Output • Manual or Automatic • Sooting Alarm • Probe Health Alarm

  5. Heating Thermocouple Cooling C C Quench Control Loop Temperature Control Loop Temp SP Run Program Events Hold %Carbon SP Setpoint Programmer Reset Gas Reference Gas Ref Enrichment Gas %C Thermocouple Dilution Air Zirconia Function Block Carbon Control Loop C Probe Health mV Probe mV Sooting Alarm Probe Clean Probe Clean Quench SP Thermocouple Heating Furnace Atmosphere Control

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