Heat Recovery Steam Generator
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and Waste Heat Recovery Solutions

 

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Heat Recovery Steam Generator
www.HeatRecoverySteamGenerator.com


What is a Heat Recovery Steam Generator?

A Heat Recovery Steam Generator, or "HRSG" is a boiler that captures or recovers the exhaust of a prime mover such as a combustion turbine, natural gas or diesel engine to create steam.

Stated another way, a HRSG is used to recover energy from the hot exhaust gases in power generation. It is a bank of tubes that is mounted in the exhaust stack. Exhaust gases as much as 800 F to 1200 F heat these tubes. Water is pumped and circulated through the tubes and can be held under high pressure to temperatures of 370F or higher which can be boiled to produce steam. Furthermore, the HRSG separates the caustic compounds in the flue gases from the occupants and equipment that use the waste heat. HRSG's are found in may combined cycle power plants.

"Once through" Heat Recovery Steam Generators operating with waste heat recovery from gas turbines (with supplementary firing and diverters in case the gas turbines aren't running at design load to maintain steam production) are also used in the oil and gas industry for Enhanced Oil Recovery applications, specifically for steam injection. Steam injection increases an oil  reservoir's pressure and reduces the viscosity of a "mature oil field." This type of Enhanced Oil Recovery iapplication is particularly beneficial for "heavy oil recovery." In fact, Steam injection is the optimum EOR application for reservoirs with low reservoir pressure field with heavy oil. Once-through HRSG's use the exhaust gas from nearby gas turbines and may use supplementary firing for producing additional steam.  Once-through HRSG's using the waste heat from gas turbines reduces the overall cost for steam injection.


Heat Recovery Steam Generator - HRSG

Absorption Chillers  *  CHP Systems  *
 Cogeneration  Enhanced Oil Recovery  *  Trigeneration  Waste Heat Recovery




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