The main function of a desuperheater is to __________.
• Desuperheater location in a steam plant (relative to superheater and drum) • Difference between saturated steam and superheated steam • What equipment is used when you want to lower steam temperature vs. raise it
• Identify which choices describe functions related to the drum and generating tubes versus functions dealing with steam temperature control • Ask yourself: does a desuperheater mainly affect water in the drum or the temperature of already-formed steam? • Consider what must be done to change superheated steam back closer to saturated steam, and which option best matches that process
• Verify which choices even mention steam temperature or superheat, directly or indirectly • Eliminate any options that talk only about heating water in the drum or adding generating surface, as that is boiler design, not superheat control • Focus on the choice that best matches controlling/reducing superheat of steam rather than producing more steam or heating water
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