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

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5. Auxiliary Steam (P&IDs)

5.0. Auxiliary Steam System

As the name suggests, auxiliary steam is the “steam supply” that helps to run various auxiliaries. In a power plant the demand for auxiliary steam is there from initial start-up until the end when the unit is running at its maximum value (rated capacity). It is worth noting that the requirement is higher during start-up of the boiler and turbine and gradually decreases as the unit is loaded to its full capacity. This is because whenever a unit is started it starts with heavy fuel oil [HFO; with a high-energy arc (HEA) ignitor], so for heating and atomizing auxiliary steam is necessary. Even if the unit is initiated with light diesel oil (LDO), steam is still necessary to heat up the HFO so ...

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