Application of sapphire thermocouples in gasification reactors

Gasification reactors, due to their harsh process conditions, place high demands on the instruments used there. Know It All have reacted to the and adapted their products correspondingly. But what are the optimisation possibilities for thermocouples for use at higher process pressures?
The challenge: ?Gasification reactors?
In a gasification reactor, there is an extremely aggressive process atmosphere and, with that, the risk of poisoning of the noble metal thermocouple. The procedure conditions often result in shutdowns and interruptions functioning. Profitability and safety aspects are thus two important themes regarding the the instruments found in them.
WIKA sapphire-design thermocouple TC84
Method of resolution: Sapphire thermocouple
By using a sapphire protection tube, the high-temperature thermocouple is protected from poisoning by the aggressive process atmosphere during operation. The reason behind this is its monocrystalline structure. The sapphire-design thermocouple has, due to its construction, a significantly higher service life than other high-pressure thermocouples and, therefore, plays a part in a clear reduction in the process downtime.
Advantages of a sapphire thermocouple
three times longer service life compared to purely ceramic thermowells because of the monocrystalline structure of the sapphire thermowell
High process safety with processes around 1,700 �C and 65 bar
Cost saving because of the elimination of complex purge systems and valves and fittings for flow measurement
Reduced amount of unplanned downtime
Increased safety against escape of toxic media through double sealing system
Construction of the TC84 sapphire-design thermocouple
Special construction of a sapphire thermocouple
The special construction of a sapphire thermocouple provides increased safety.
The principal sealing serves as protection against the escape of toxic process gases at high pressures and also at high temperatures
The secondary sealing is the safeguard in the event of a malfunction in the principal seal because of any unforeseeable disturbance to the principal seal
The ceramic outer thermowell serves as protection against harsh process conditions
The sapphire protection tube protects internally against contamination of the thermocouples through diffusion
Note
WIKA is rolling out the TC84 sapphire-design, high-temperature thermocouple specifically for used in gasification reactors. More info on the TC84 can be found on the WIKA website and in our flyer.

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