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14 Cards in this Set
- Front
- Back
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What is the purpose of Feedwater Heater Extraction, Drains, and Vents System?
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Answer: Removal of condensate and high moisture content steam from Main Turbine to prevent damage to blading, and allows preheating of Condensate and Feedwater using heat energy retained to improve cycle efficiency.
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How do the Low Pressure Condensate heaters raise the temperature of condensate?
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Answer: Extraction steam heating
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What do #5 High Pressure Feedwater Heaters use for level control?
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Answer: Motor-operated extraction steam isolation valve
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Removal of condensed steam (water) and partially condensed steam (high moisture content) serves to ___
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Answer: Protect the turbine blading from water intrusion, and erosion while removing heat that is used to preheat condensate and feedwater.
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How many MSR Drain Tanks are installed at WCGS and what do they do?
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Answer: 12 drain tanks are installed, three for each of the MSRs. They drain condensed fluid from the MSR shell, 1st and 2nd stage reheater tubes, and allow the retained heat of the fluid to be recovered in Feedwater Heaters, before being routed to the Heater Drain Tank.
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How much flow do the Heater Drain Tank Pumps contribute to total condensate flow?
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Answer: One third of total condensate/feedwater flow is provided by the Heater Drain Pumps at full power.
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1. At what power level is all feedwater preheating secured?
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Answer: Above 25 % power because sufficient heat input is obtained from the Main Turbine to raise temperature of fluid.
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2. The Heater Drain Tank receives inputs from which of the following: A. HP Heaters 5, 6 and MSR Drain Tanks B. LP Heaters 2, 3, 4 and MSR Drain Tanks C. MSR Drain Tanks 2nd stage only D. MSR Drain Tanks 1st and 2nd stages only
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Answer: HP Heaters 5, 6 and MSR Drain Tanks
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1. Which HP heaters have hi level dumps valves to the Main Condenser?
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Answer: Only #6 & #7 HP heaters
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1. Main Steam can be supplied through the 3rd and 5th stage extraction lines to the HP heaters _______________ for feedwater pre-heating during __________________.
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Answer: 6A/B and 7 A/B / startup and shutdown
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The Heater Drain Tank Level Control Valve must have__________________ before it can modulate to control level in the tank.
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Answer: a pump running
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At full power, Heater Drain Tank Pump discharge flow accounts for about _____ of total feedwater flow.
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Answer: one third
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How does bypassing HP heaters with AE HV-38 (Bypass valve) actually cause generator output to increase?
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Answer: bypassing HP heaters reduces the amount of extraction steam removed from the 3rd and 5th stages, which allows more steam to pass through the turbine producing more work.
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What is the concern regarding a high water level in feedwater heaters?
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Answer: Water induction into the Main Turbine will damage the hot blades
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