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Power Plant Instrumentation and Control Handbook by Ajay Kumar Debnath, Swapan Basu

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4. Extraction Steam (P&IDs): Bleed Steam

4.0. Extraction Steam System

Extraction steam, also known as bleed steam, is the system for which the regeneration cycle has been made possible. To avoid thermal shock condensate, FW is preheated by extraction steam before admission to the boiler.

4.1. Objective and Function of the System

Out of the total steam admitted to the turbine, a major part is used to do the mechanical work in the turbine, whereas another part is used to preheat condensate and FW. Generally the extraction lines are numbered from low to high pressure (e.g., first three extraction lines from the LPT are numbered as I, II, and III, to heat up LP Heaters 1, 2, and 3, respectively). However, reverse numbering systems are also seen. Number, ...

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