How to install thermocouples in the furnace of a spacecraft furnace
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In the water-coal slurry process, the thermocouples used to measure the temperature in the gasification furnace are installed with a certain amount of expansion space above and below the refractory bricks, in order to prevent longitudinal shear forces exerted on the refractory bricks during furnace operation from damaging the thermocouples. The six temperature points used to measure the temperature inside the furnace in such reactors are located beneath the refractory material that makes up the water-cooled wall; what is the approximate difference between these measurement values and the actual furnace temperature? How can it be prevented that the water-cooled wall moves due to heat exposure and thus damages the thermocouples? I would like to ask those who are familiar with space reactors how the thermocouples in those reactors are installed.
Although I specialize in manufacturing thermocouples, I really don’t know which installation method is best, after all, I’m not on site! Sorry
This temperature is not determined by using high-temperature thermocouples to directly measure the furnace temperature as in the case of four-nozzle or Texaco systems; rather, it is calculated based on certain formulas. It is not a direct measurement, and since there are no refractory bricks, there is no cutting force, so damage generally does not occur. The only thing to be careful about is corrosion of the casing by syngas, which could lead to leaks.