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 __________.
• Function of a steam control orifice in a live steam line feeding a low pressure evaporator • Difference between superheated, saturated, and desuperheated steam • Meaning of steam quality (percentage of vapor vs. water droplets)
• What happens to steam pressure, temperature, and moisture content when steam is throttled through an orifice from high pressure to low pressure? • If the steam is "not properly conditioned" before entering the evaporator, what problem is the evaporator most sensitive to: too hot, too wet, or not at saturation? • Which of the choices describes steam that would be harmful to heat-transfer surfaces and evaporator performance?
• Be clear on the definition of steam quality (0% = all water, 100% = all vapor). • Recall that throttling through an orifice is essentially a constant-enthalpy process; think about what that does to dryness fraction. • Match each answer choice to a clear physical condition (extra moisture, extra temperature above saturation, exactly at saturation, or intentionally cooled from superheat).
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