RNGplus

To tackle the threat of climate change, states like California and Oregon currently pay a premium for environmentally friendly Renewable Natural Gas (RNG). By using RNG to offset the use of gasoline and diesel, emmisions from the transport sector can be greatly lowered. As the number of state and utility programs grow, demand for RNG will increase, so additional sources of RNG are needed to increase supply.

 

Quantalux developed RNGplus to do just that.

 

RNGplus is a funded USDA SBIR Phase II concept for additional RNG generation using renewable power by blending waste CO2 and hydrogen. RNGplus offers “bonus” RNG to any existing facility, increasing gas production up to 30%.

Production of RNGplus

  1. Biogas from dairy digesters is ~60% methane and ~40% CO2. During the upgrade process to RNG, CO2 is separated and vented (“tail gas CO2”).
  2. Trace amounts of sulfur in tail gas CO2 are removed using a series of sorbent-based guard beds.
  3. Conditioned CO2 is blended with hydrogen over a methanation catalyst, resulting in nearly pure methane (aka RNGplus).
  4. RNGplus is blended with the main RNG stream into existing pipeline infrastructure to replace diesel or gasoline.

Benefits

On-site production of RNGplus takes advantage of existing RNG conditioning and upgrade equipment, lowering overall production costs.

By capturing and using the CO2 and CH4 from organic waste, RNG production has a significant impact on reducing greenhouse emissions and farms.
RNGplus makes use of carbon-free hydrogen without the problems of H2 storage and transport.

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