Rotapower® Engine for Biogas Generation

Scalable Renewable Energy Solutions for Biogas Producers

Why Biogas?

The United States produces 70 million tons of organic waste every year. When improperly managed, this waste releases a significant amount of dangerous containments to our environment, including large amounts of methane, a powerful greenhouse gas.

Anaerobic Digestion Process "Fact Sheet - Biogas: Converting Waste to Energy"

Through careful management of organic waste and controlling methane production process through managed anaerobic digestion systems, we can capture the resulting biogas to be used in heat and energy generation systems. Because the source of this biogas is from organic waste, it is a carbon-neutral cycle that will not increase levels of global warming gasses in our atmosphere.

Current number of operational and potential biogas systems in the United States by feedstock.EPA

In the United States there are huge opportunities for biogas electrical generation systems - for example, in 2018 the EPA estimated the potential for over 8,000 livestock biogas systems, which would generate over 15 million megawatt-hours of energy every year.

Global methane emissions have risen far faster than expected over the last 10 years. Agricultural methane emissions have been recently determined to be higher than previously calculated. The Global Warming Potential (GWP) of methane has been re-evaluated by the IPCC to be much higher than originally calculated, now at 86 times more potent than carbon dioxide over its 10 year lifetime. (See GWP of methane on p.714 in Chapter 8 of the Climate Change 2013: The Physical Science Basis report, part of the fifth assessment report from the IPCC).

In California, the Air Resources Board has adopted strict rules for methane emissions, which went into effect on January 1, 2018. (See the SLCP Reduction Strategy) The Global Methane Initiative has identified many mitigation opportunities in their summary analysis.

Biogas Electrical Generation

Freedom Motors has a unique market solution for renewable energy generation utilizing biogas from any source. Our Rotapower engine solves many problems associated with biogas electrical generation.

The Rotapower Solution

Low Cost

Installed systems 66% lower cost than existing solutions

Scalable Options

20kW to 500 kW generator configurations

Resists Contaminants

No filtering required for hydrogen sulfide or siloxane

Reduced Emissions

Untreated exhaust emissions 5X lower than EPA standards

Low Maintenance

Few critical engine components & 20,000+ hour run life

Fuel Flexibility

Runs on biogas with 40% and higher methane concentration

The Rotapower® engine can run on a variety of fuels (ethanol, methanol, gasoline, natural gas, diesel, etc.) However, through extensive testing we have shown that the Rotapower® engine is unique in that it can run on untreated methane (biogas, sour gas) without any detrimental effects. And because of the lean burn combustion conditions, most pollutants are completely eliminated. The engines only have 2 moving parts, and due of our patented cooling and lubrication technologies, have a continuous run-life greater than 20,000 hours. Combining the Rotapower® engine with an off-the-shelf generator will allow companies to completely eliminate their methane emissions and convert this energy directly in to usable electricity, to be used locally or sold directly to a power company.

Rotapower® Combustion of Landfill Gas (LFG)
(Without Pilot/Coolant Fuel)

Assumptions:
Single Rotor Displacement (cc): 530
Est. Thermal Efficiency: 27%
Est. Volumetric Efficiency (Naturally Aspirated): 70%
% Methane in LFG: 60%
Generator Efficiency: 90%
Biogas Density (25°C, 1 atm): 1.15 kg/m3
Rotors Disp
(cc)
RPM Engine
(cfm)
Methane
[CH4]
(cc)
Landfill
Gas [LFG]
(cfm)
Landfill
Gas [LFG]
(cmd)
Landfill
Gas [LFG]
(kgd)
Air Used
(cfm)
Energy
from CH4
(BTU/hr)
Mechanical
Power
(BHP)
Electrical
Power
(kW)
1 530 3600 47.2 4.2 7.0 287.0 330.1 40.1 244,280 26 17
4400 57.6 5.2 8.6 350.8 403.4 49.0 298,564 32 21
5200 68.1 6.1 10.2 414.6 476.8 58.0 352,849 37 25
6000 78.6 7.0 11.7 478.4 550.1 66.9 407,133 43 29
2 1060 3600 94.3 8.4 14.1 574.0 660.2 80.2 488,560 52 35
4400 115.3 10.3 17.2 701.6 806.9 98.1 597,129 63 43
5200 136.2 12.2 20.3 829.2 953.6 115.9 705,698 75 50
6000 157.2 14.1 23.5 956.7 1100.3 133.7 814,267 86 58
3 1590 3600 141.5 12.7 21.1 861.1 990.2 120.4 732,840 78 52
4400 172.9 15.5 25.8 1052.4 1210.3 147.1 895,693 95 64
5200 204.4 18.3 30.5 1243.8 1430.3 173.9 1,058,547 112 75
6000 235.8 21.1 35.2 1435.1 1650.4 200.6 1,221,400 130 87
4 2120 3600 188.6 16.9 28.2 1148.1 1320.3 160.5 977,120 104 70
4400 230.6 20.6 34.4 1403.2 1613.7 196.2 1,194,258 127 85
5200 272.5 24.4 40.7 1658.4 1907.1 231.8 1,411,395 150 101
6000 314.4 28.2 46.9 1913.5 2200.5 267.6 1,628,533 173 116
5 2650 3600 235.8 21.1 35.2 1435.1 1650.4 200.6 977,120 104 70
4400 230.6 25.8 43.0 1754.0 2017.1 245.2 1,492,822 158 106
5200 340.6 30.5 50.8 2072.9 2383.9 289.8 1,764,244 187 126
6000 393.0 35.2 58.7 2391.9 2750.6 334.4 2,035,667 216 145
6 3180 3600 283.0 25.3 42.2 1722.1 1980.5 240.7 1,465,680 156 104
4400 345.8 31.0 51.6 2104.8 2420.6 294.2 1,791,387 190 128
5200 408.7 36.6 61.0 2487.5 2860.7 347.7 2,117,093 225 151
6000 471.6 42.2 70.4 2870.2 3300.8 401.2 2,442,800 259 174
7 3710 3600 330.1 29.6 49.3 2009.2 2310.5 280.9 1,709,960 181 122
4400 403.5 36.1 60.2 2455.6 2824.0 343.3 2,089,951 222 149
5200 476.9 42.7 71.2 2902.1 3337.4 405.7 2,469,942 262 176
6000 550.2 49.3 82.1 3348.6 3850.9 468.1 2,849,933 302 203
8 4240 3600 377.3 33.8 56.3 2296.2 2640.6 321.0 1,954,240 207 139
4400 461.1 41.3 68.8 2806.4 3227.4 392.3 2,388,515 253 170
5200 545.0 48.8 81.3 3316.7 3814.2 463.6 2,822,791 300 201
6000 628.8 56.3 93.9 3827.0 4401.0 535.0 3,257,067 346 232
9 4770 3600 424.4 38.0 63.4 2583.2 2970.7 361.1 2,198,520 233 157
4400 518.8 46.5 77.4 3157.2 3630.8 441.3 2,687,080 285 191
5200 613.1 54.9 91.5 3731.3 4291.0 521.6 3,175,640 337 226
6000 707.4 63.4 105.6 4305.3 4951.1 601.8 3,664,200 389 261

To learn more about the Rotapower® engine and the business opportunities for methane emission mitigation, please read our whitepaper: Using the Rotapower® Engine to Reduce Atmospheric Methane Content. Also, please watch this video interview for Discovery Channel with our President, CTO and Rotapower® engine inventor, Dr. Paul Moller::

Dr. Moller Interview with Daily Planet - Nov 23 2017

008(a) Biogas Application Brochure