Understanding and Improving Thermochemical Processes


Corrosion Probes/ Fouling Probes

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Findings on corrosion (causes, mechanism, dynamics) and on soiling can be obtained with the same probe design which is used for material investigations (see menu item Material Probe) – hereinafter referred to as “CheMin Probe”.

To detect the effects of corrosion and erosion as well the properties of fouling, probes with a real tube structure at real application sites are indispensable. This is the only way to create a real heat flux density, a real cold trap and a real temperature gradient in the fouling.

The selectable temperature range on the probe’s body provides - also for these applications - an important additional degree of freedom for the detection of temperature-dependent findings.

Possible usage scenarios include:

  • Dew points: the temperature range is set on the probe, e.g. from 80°C to 200°C. In contrast to other dew point probes, the CheMin Probe also records particulate fouling and so its corrosiveness (e.g. deliquescent salts such as ammonium chloride).
  • High temperature chlorine corrosion: the temperature range is set on the probe, e.g. from 250°C to 500°C. The thermodynamic properties of the salts result in a type of corrosion that depends, to a high degree, on temperatures. The CheMin Probe clearly shows these effects. Changes in the material’s temperature of 10 or 20 Kelvin can reduce degradation rates by more than 50%. Quantifying this potential by means of the CheMin Probe opens up new avoidance strategies in process technology.
  • Saltmelt corrosion: the temperature range is set on the probe, e.g. from 350°C to 550°C. Saltmelt corrosion also highly depends on temperature levels and heat flux density. The CheMin Probe clearly shows these effects.
  • Thick and/or hard fouling: the temperature range is set corresponding to the component under investigation (evaporator, superheater, ECO etc.). Fouling deposition at the site and subsequent analysis in the lab. In most cases, specific fuel components (e.g. metallic aluminium) or the saturation temperatures of dissolved salts are responsible for the negative properties of fouling. The CheMin Probe clearly shows these effects.

CheMin:     Variety of usages for probes with high diagnostic conclusiveness.

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Last updated: 29.01.2019