Temperaturmessung unter extremen Bedingungen

In the generation of synthesis gas by the gasification of fuel oil the reactors are controlled, among other things, via the temperature. For the temperature measurement thermocouples (PtRh30/PtRh6) are used, which are producted by sintered corundum conduits. At temperatures up to 1880 K and at pressures up to 4MPa the thermocouples and conduits are exposed to exreme conditions due to the gas atmosphere and the oil ash. The change of the structure of the thermo wires and the sintered corundum conduits has been studied and represented. It has been found that the measuring accuracy and the life of the thermocouples depend very much on the quality of the sintered corundum conduits and on a stable plant operation