Question: Selectors are normally used in combustion control systems to prevent unsafe situations from occurring. Figure E. shows the typical configuration for high and low selectors

Selectors are normally used in combustion control systems to prevent unsafe situations from occurring. Figure E. shows the typical configuration for high and low selectors are applied to air and fuel flow rates. The energy demand signal comes from the steam pressure controller. Discuss how the selectors operate in this control scheme when the furnace temperature dropssuddenly. FC FT FC FT Fire! flow Air flow rate rate PT Furnace

FC FT FC FT Fire! flow Air flow rate rate PT Furnace Steam Water

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