Question 41General Subjects - 1st Asst/Chief70% to pass
Regarding the low pressure evaporator steam control orifice in the live steam supply line, the steam at the outlet of the orifice if not properly conditioned will be developed as _______________.
AI Explanation
The correct answer is D) superheated steam.
When the steam passes through the low pressure evaporator steam control orifice in the live steam supply line, the rapid expansion of the steam leads to a decrease in pressure and temperature. This causes the steam to become superheated, meaning it has a temperature higher than the saturation temperature corresponding to its pressure.
The other options are incorrect because:
A) Poor quality steam would not be the result of passing through the orifice.
B) Desuperheated steam has a temperature equal to the saturation temperature, which is not the case here.
C) Saturated steam has a temperature equal to the saturation temperature, but the rapid expansion through the orifice results in superheated steam.
Related Questions
#39 The vacuum maintained in the salt water feed heater shell of a flash-type evaporator is generally accomplished by _______________.#40 Small droplets of water entrained in the flashed vapor produced in a flash-type evaporator are removed by the _______________.#42 Under normal operating conditions, the highest temperature and pressure conditions existing for flash-type evaporators will occur in the _______________.#43 Where a two-stage air ejector set is used in a two-stage flash evaporator, the first-stage air ejector takes suction from the second stage of the evaporator, and the second stage air ejector _______________.#44 The temperature of the steam flow to the saltwater feed heater, in a flash type evaporator can be manipulated by a/an _______________.