Recovering exhaust heat from gas turbines and internal combustion engines is an easy way to optimize efficiency and performance while reducing the environmental impact of power generation plants widely employed for processing and refining in the Oil & Gas sector and at electricity production stations.
When it comes to available technologies to recover waste heat from these sources, the market offers two commercial solutions: steam technologies and Organic Rankine Cycle systems.
WHR plants employing steam offer advantages in terms of both efficiency and security for plant operation but lack flexibility and require more maintenance compared to ORCs.
The Organic Rankine Cycle (ORC) offers the advantages of higher flexibility, as well as less and simpler maintenance, making it the preferred choice for exhaust gas heat recovery from both engines and gas turbines in the low-medium size range.
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EXAMPLE of performance and payback time from 7 gas engines mod. Rolls Royce B35:40 V20AG2 | operational load 100% | fuel: natural gas
EXERGY’s ORC power plants range between 1 MW to 20 MWe for a single unit.
The heat recovery system extracts thermal power from the exhaust of engines or turbines to feed the ORC module via an intermediate loop of heat recovery. The intermediate fluid, usually oil, transfers heat to the organic fluid in the ORC evaporator, where it vaporizes. The vaporized fluid then flows to the turbine. Here, the vapor expands, causing the turbine to spin and creating electricity in the generator.
The vaporized organic fluid then continues through the cycle to the condenser where it transforms into liquid, ready to be processed by the pump before beginning the cycle again.