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

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6. Blow Down and Dosing Control

6.1. Blow Down

6.1.1. Functional Requirements

As the steam is generated from the boiler, the total dissolved solid (TDS) starts rising and forms deposits and scales at boiler parts such as the tube. When these are carried by the steam, they will form deposits elsewhere, e.g., turbine. Therefore whenever the TDS level crosses the limit set by the manufacturer blow down is necessary. The basic purpose of blow down is to regulate the boiler parameters within the prescribed limits to minimize, “carryovers,” “corrosion,” and “scale formation” and to drive out the “suspended particles.” So, TDS, alkalinity, and silica suspended solids are the major factors based on which blow downs are carried out.
FIGURE V/6.1.4-1 Boiler ...

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