Greenlane Renewables completes testing of Linear Nitrogen Rejection Unit
In Canada, Greenlane Renewables Inc. recently completed testing of its proprietary Linear Nitrogen Rejection Unit (NRU) technology has demonstrated breakthrough methane recovery performance of up to 99.5%. Greenlane’s Linear NRU technology, at the heart of its next generation Cascade LF landfill gas upgrading system, is engineered to efficiently remove nitrogen from landfill gas, producing pipeline quality renewable natural gas while maximizing methane capture in a configurable low-cost system architecture.
Greenlane’s Linear NRU technology is based on equilibrium pressure swing adsorption (“PSA”) principles and removes nitrogen to the level required to meet RNG pipeline injection specifications in a simplified stepwise methane gas enrichment process using fewer and smaller adsorption beds than conventional equilibrium PSA technology. It also eliminates the internal gas recycling step, which is wasteful in terms of operating cost and methane recovery. For landfill gas with higher nitrogen levels, Greenlane’s modular design uses additional adsorption beds and compression in a staged configuration, maintaining the linear approach.
As part of the design validation process, Greenlane engineers built a prototype Linear NRU, scaled down in size from the production design, installed it in a testing environment, heavily instrumented it, and measured all process parameters during a series of tests. A variety of mixed gases, containing methane, nitrogen and oxygen in different ratios representing different qualities of landfill gas, were tested to verify the technology’s ability to upgrade biogas to pipeline quality RNG. The testing program was designed to verify methane recovery in the nitrogen removal steps across the full range of nitrogen levels found in landfill gas.
Category: Fuels
