Gas Turbine Exhaust Energy & Heat Recovery Calculator
Calculate exhaust gas mass flow rate (lb/hr), available sensible waste thermal energy (MMBTU/hr & MWth), and steam generation capacity for cogeneration and HRSG boilers.
Turbine Output & Exhaust Gas State
HRSG Steam Generation Parameters
Recoverable Energy & Steam Production
Recommended Tools & Equipment
Tested hardware and components for high reliability
Frequently Asked Questions
How much exhaust gas does an industrial gas turbine produce per megawatt?
Typically, industrial gas turbines exhaust between 6.0 and 8.5 lb/sec of hot flue gas per MW of electrical output. For a 50 MW turbine, this represents approximately 300 to 400 lb/sec (over 1.2 million pounds per hour) of oxygen-rich gas at 900°F to 1050°F.
Why can gas turbine exhaust gas support supplementary duct firing?
Gas turbines operate with enormous amounts of excess air (typically 200% to 300% excess air to limit combustion temperatures). Consequently, the exhaust gas still contains 13% to 15% atmospheric oxygen by volume, which easily supports direct supplementary duct burners without requiring external fresh combustion air fans.
What governs the minimum allowable stack temperature?
The minimum stack temperature (typically 250°F to 300°F) is governed by the acid dew point. If the fuel contains even trace amounts of sulfur (H2S or mercaptans), sulfur trioxide (SO3) reacts with exhaust moisture to form sulfuric acid (H2SO4), which rapidly corrodes steel tubes if gas cools below its condensation temperature.