Page 219 - Engine IQflip'21

Steam Boiler/Heat Recovery Steam Generation

Rules of Thumb Engine
Exhaust Temp
⁄ Q from exhaust = Q to Steam
(Less blow-down & radiant loss)

⁄ Typical Steam pressure are up to 300 psig

⁄ 1 ton of steam required energy 680 Kwh Stack Temp

(feed water temp 80C)

⁄ Stack temp limited by fuel sulfur content

⁄ Pinch point – The pinch point is the minimum
temperature difference between the flue gas
and

the EVAP saturation temperature. The surface
grows exponentially with lower pinch point temp.

Steam Tools use 20C. (Aggressive 14C)

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