Operating a steam turbine propulsion unit at...

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Question 1 of 205eccef9cbacbc34ba4d45775

Operating a steam turbine propulsion unit at reduced speed, in an area with extremely cold seawater, with the main circulating pump providing full cooling water flow to the condenser will result in __________.

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🔍 Key Concepts

• Condensate depression and how extremely cold seawater affects condensate temperature leaving the condenser • Relationship between circulating water flow, condenser pressure (vacuum), and overall plant efficiency in a steam turbine plant • Effect of reduced load / reduced turbine speed on required gland sealing steam and condenser operating conditions

💭 Think About

• Think about what happens to the condensate temperature if very cold seawater is flowing through the condenser at full rate while the plant is operating at reduced power: is the condensate closer to, or farther below, its saturation temperature? • How does increased or decreased condensate depression influence the amount of heat that must be added in the boiler per pound of steam, and thus the overall thermal efficiency? • Ask yourself whether colder circulating water and full flow always improve efficiency, or whether there is a point where cooling the condensate too much actually hurts performance.

✅ Before You Answer

• Verify how increased condensate depression (condensate much cooler than saturation temperature at condenser pressure) affects cycle efficiency in a Rankine steam cycle. • Check whether higher attainable vacuum in the condenser at reduced load, with very cold seawater, is always beneficial or can be offset by other losses. • Confirm whether gland sealing steam demand is primarily a function of shaft sealing requirements (pressure differentials and leakage paths) versus condenser water temperature.

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