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The Allam-Fetvedt Cycle

Science Magazine

“goodbye smokestacks – startup invents zero-emission fossil fuel power”

We Capture Carbon

Developed by Rodney Allam and Jeremy Fetvedt, NET Power’s semi-closed loop technology leverages oxy-combustion to produce emissions-free power.

The Allam-Fetvedt Cycle burns natural gas with pure oxygen. The resulting CO2  is recycled through the combustor, turbine, heat exchanger, and compressor, creating lower-cost power with zero emissions.

Bloomberg

“this power plant has cracked carbon capture”

The 4 Steps To Advanced Clean Energy
How The Allam-Fetvedt Cycle Works

The Allam-Fetvedt Cycle is pretty simple.

It burns natural gas with pure oxygen.
The resulting CO2 is recycled through the combustor, turbine, heat exchanger, and compressor,
creating lower-cost power with zero emissions.

Captured CO2 is pipeline ready and can either be cheaply sequestered
or sold to industries such as the medical, agricultural, and industrial sectors.

Step 1
The Burn

Oxy-combustion is the process of burning natural gas with pure oxygen (instead of air).

When air is used as the primary oxidant, nitrogen oxides (NOX) are released into the atmosphere. This isn’t only bad for the environment – it’s also less efficient.

When pure oxygen is the primary oxidant, fuel consumption is reduced, and flame temperatures are increased, adding efficiency.

Step 2
The Expansion & Cooldown
The high-pressure CO2 moves along into the turbine, where it expands and goes into the heat exchanger.

Any water is removed, and the remaining CO2 is compressed and pumped back into high-pressure.

Step 3
Reuse & Recycle
Most of the high-pressure CO2 is reheated in the heat exchanger and returned to the combustor, where the whole cycle begins again.
Step 4
Piping
The excess CO2 that comes from step #2 is pipeline ready. It’s inherently captured, not released into the atmosphere.

This step increases the Allam-Fetvedt Cycle’s overall financial value by providing a valuable byproduct and eliminating any carbon-related liabilities.

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NET Power Offers
Unmatched Environmental Benefits

0

Carbon & Particulate Emissions

0

NOX &
SOX

0

Water
Required

Nature

“…it could help to usher in an era of clean power from fossil fuels”

NET Power vs. Conventional Natural Gas Power Plant

Allam-Fetvedt Cycle Zero Emission Power
NET Power plants have no stacks.
NET Power Plant:
The Allam-Fetvedt Cycle
Notice anything different?
Conventional Natural Gas Power Plant
Combined Cycle Gas Turbine

Natural gas is burned with pure oxygen

This creates CO2 that is sent through the rest of the cycle

New CO2 is captured and the remainder is recycled –nothing is released into the atmosphere

 

Fuel is burned in air

This creates NOX emissions, and the resulting CO2 is sent into the atmosphere unless it is cleaned by expensive post-combustion carbon capture

The cycle reuses CO2 which drives efficiency and reduces the cost of electricity
The cycle does not maintain custody of its CO2 and creates other emissions by burning natural gas in the presence of atmospheric gases

Excess industrial gases created through cycle are pipeline and commercially-ready to be sold to crucial industries (e.g. industrial and agricultural feedstock), enhancing the value of the power plant

The byproducts of this cycle are toxic to the environment and contribute to the globe’s rising temperatures; the only positive byproduct is electricity
Land usage of <13 acres (>40% less than similar output natural gas plant)
Average land usage of 20–25 acres

NET Power vs. Conventional Natural Gas Power Plant

Allam-Fetvedt Cycle Zero Emission Power
NET Power plants have no stacks.
NET Power Plant:
The Allam-Fetvedt Cycle

Natural gas is burned with pure oxygen

This creates CO2 that is sent through the rest of the cycle

New CO2 is captured and the remainder is recycled –nothing is released into the atmosphere

The cycle reuses CO2 which drives efficiency and reduces the cost of electricity

Excess industrial gases created through cycle are pipeline and commercially-ready to be sold to crucial industries (e.g. industrial and agricultural feedstock), enhancing the value of the power plant

Land usage of <13 acres (>40% less than similar output natural gas plant)

Notice anything different?
Conventional Natural Gas Power Plant
Combined Cycle Gas Turbine

Fuel is burned in air

This creates NOX emissions, and the resulting CO2 is sent into the atmosphere unless it is cleaned by expensive post-combustion carbon capture

The cycle does not maintain custody of its CO2 and creates other emissions by burning natural gas in the presence of atmospheric gases

The byproducts of this cycle are toxic to the environment and contribute to the globe’s rising temperatures; the only positive byproduct is electricity

Average land usage of 20–25 acres

Forbes

“net zero natural gas plant—the game changer”

We make existing power plants
economically and environmentally obsolete.

Zero
Emissions

No air pollutants.

Lower
Power Costs

The Allam-Fetvedt Cycle reuses CO2, which drives efficiency and reduces the cost of electricity.

Complements
Renewables

NET Power is the perfect zero emissions match for intermittent renewable energy thanks to its inherent energy storage capabilities and output flexibility.

Multiple
Revenue Streams

Rather than emitting greenhouse gases, CO2 is captured and salable, along with other industrial gas coproducts (argon and nitrogen).

Made for
Anywhere

The NET Power technology solution is tailored to market needs: It complements current infrastructure, is available in multiple size variations, is compatible with low-grade fuels, is capable of water-free production, has a significantly smaller land footprint and is universally permittable.

Our differentiation is unequalled.