I’ll do one question per day too, 2015.7.29
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The conversion furnace must stop receiving steam after hydrogen supply is halted. The condition under which the conversion catalyst can be exposed to steam alone is that the steam temperature is A. 20°C below the dew point temperature; B. above 420°C; C. 20°C above the dew point temperature; D. above the saturation temperature
The conversion furnace must stop receiving steam after hydrogen supply is halted. The condition under which the conversion catalyst can be exposed to steam alone is that the steam temperature (D) A is 20°C or lower than the dew point temperature; B. is higher than 420°C; C. is 20°C or higher than the dew point temperature; D. is higher than the saturation temperature
D. Above the saturation temperature. . . . . . .
The condition under which a conversion catalyst allows separate contact with water vapor is that the temperature of the water vapor is above 20°C above the dew point temperature
C. More than 20°C above the dew point temperature
Catalysts generally should not come into contact with moisture, as this can cause scarring on the catalyst and affect its activity. So the less water content in the water vapor, the better; the lower the dew point, the less water content there is, so I choose A.
The conversion furnace must stop being fed with steam after hydrogen supply is halted. The conversion catalyst can be exposed to steam alone provided that the temperature of the steam is above 20°C above the dew point temperature
The conversion furnace must stop receiving steam after stopping the supply of hydrogen. The condition under which the conversion catalyst can be exposed to steam alone is that the temperature of the steam is () A. at least 20°C below the dew point temperature
The stoppage of steam supply to the converter must take place after the hydrogen supply is stopped. The conversion catalyst can be exposed to steam alone provided that the temperature of the steam is at least 20°C below its dew point temperature