Waste heat recovery systems are among the most economical ways to increase
the overall efficiency of the plant and while lowering fuel demand. Large
quantities of the fuel used to produce power in conventional power plants is
wasted due to the limitations of the power conversion processes. Exhaust gas of
various processes carry a huge amount of energy, also referred to as waste
heat. Often industrial processes produce enough waste heat to generate
electricity. Waste heat recovery units (WHRUs) or heat to power units could
recover the waste heat and transform it into electricity by using, for example,
an organic Rankine cycle (ORC). Any exhaust gas stream with temperatures above
250°F has the potential for significant waste heat recovery. The waste heat
temperature is a key factor determining waste heat recovery feasibility. Waste
heat temperatures can vary significantly. In order to enable heat transfer and
recovery, it is necessary that the waste heat source temperature is higher than
the heat sink temperature.
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Waste Heat Recovery Systems Market: Market Dynamics and Trends
Consumers of waste heat recovery systems include plant process heating,
combustion air pre-heating, boiler feed water pre-heating, steam ejectors, ORC
generators, and building comfort heat. Often, waste heat is of low temperature
quality. It can be difficult to efficiently utilize the heat contained. In
these cases ORC technology can bring an additional benefit to raise the overall
plant efficiency. The ORC unit utilizes this otherwise wasted energy and
converts it into power.
In the upstream oil & gas segment the need
for heating process fluid is required in floating production storage and
offloading vessels (FPSO), offshore process platforms, and onshore processing
units. This is done by harnessing the waste heat available in the exhaust
gases, leaving the gas turbine generator (GTG) or the process gas compressor
drives (PGC).
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