GE ORegen Brochure

ORegen*

Waste Heat Recovery System
for GE and other OEM Gas Turbines

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Increased production

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Higher efficiency

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Compliance with environmental regulations

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Availability and Reliability

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Life extension

Addressing environmental problems is becoming an important initiative
throughout the world. The reduction of CO
the path toward lowering the human contribution to climate change.
Many industrial processes generate waste energy that passes out of plant
stacks into the atmosphere and is lost.
Energy recovered from waste heat streams could supply part or all of the
electric power required by a plant, at no additional cost.
Therefore, heat recovery offers a great opportunity to conserve by
productively using this waste energy, to reduce overall plant energy
consumption and simultaneously decrease CO2emissions.

emissions is a key element in

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Get more from your

Gas Turbines

* ORegen is a trademark of Nuovo Pignone S.p.A. and is available in select markets

a product of

ecomagination

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Layout of a plant equipped with the
ORegen waste heat recovery system

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Power generation with zero additional
emissions

ORegen is a thermodynamic superheat
cycle that recovers waste heat from gas
turbine exhaust and converts it into
electric energy. The thermodynamic cycle
is based on an Organic Rankine Cycle
(ORC). Heat from the turbine exhaust is
transferred to a closed diathermic oil loop,
which is used to heat an organic fluid loop.
This lower temperature heat is then
converted into useful work that can
generate electricity. The ORC works with
a hydrocarbon fluid in place of water.
The system is similar to a conventional
steam bottoming cycle except for the
organic fluid that drives a turboexpander
that in turn drives the generator. The
diathermic oil and the organic fluid allow
low temperature heat sources to be
exploited efficiently to produce electricity
over a wide range of power output, from
a few MW up to 16 MW per unit.

Closed loop system

The organic working fluid is vaporized
and pressurized in the evaporator by
the application of heat taken from the
gas turbine exhaust stream. Then, the
vapor expands in the turboexpander
and is condensed using air-cooled
heat exchangers at ambient
conditions. The condensate is pumped
back to the evaporator, thus closing
the thermodynamic cycle. The
heating and cooling sources are not in
direct contact with the working fluid,
nor with the expander. For higher
temperature applications, a high
temperature thermal oil is used as
the heat carrier and a regenerator is
added to further improve the cycle
performance.
The selection of the working fluid is
key in a Rankine Cycle.
The features are:

• Low freezing point and high
temperature stability

• High heat of vaporization and
density

• Low environmental impact

• No additional EHS considerations

• Readily available at low cost