Biogas Desulphurization
Gas Upgrading System
Today's state-of-the-art landfill gas upgrading technology is too costly for the performance it delivers. The challenge is achieving low cost and high performance at the same time when O₂ and N₂ need to be removed.
Greenlane is addressing this problem with our next-generation Cascade LF landfill gas upgrading system, designed to achieve maximum methane recovery with minimum capital expenditure. It features:
The first process step is pre-treatment. Raw landfill gas passes through activated carbon, removing Hydrogen Sulfide (H₂S). For higher H₂S and flow applications, optional Cascade H₂S (regenerative bulk H₂S removal) is available for lower OPEX. Subsequent pre-treatment removes VOCs and Siloxanes using formulated activated carbon. For high levels of contaminants, a proprietary regenerative temperature swing adsorption (TSA) module is used.
Pre-treated gas is then compressed, dewatered, and temperature-controlled. A patent-pending integrated upgrading process using membrane separation featuring permeate sweep technology and catalytic deoxygenation effectively eliminates CO₂ and O₂ with no need for a dedicated dryer. Elimination of CO₂, O₂, and H₂O creates the conditions for optimal subsequent N₂ removal. The separated CO₂ stream can be sequestered or used for other value-added purposes. At lower O₂ levels, catalytic deoxygenation is not required.
In the final upgrading step, only enough N₂ is removed using a proprietary equilibrium pressure swing adsorption (PSA) module to meet the final biomethane/RNG product specification.
With 24/7 expert support, remote monitoring, and flexible service options, Greenlane’s Cascade LF delivers high performance and reliability for landfill gas projects, backed by decades of industry experience.
Every biogas project requires hydrogen sulfide (H2S) removal. The Greenlane™ Cascade H2S product line delivers an established and robust regenerative biogas desulfurization solution where the goal is high performance at low cost.
The raw untreated biogas feeds into the bottom of a scrubbing tower where it flows, countercurrent, to a proprietary liquid chemical solution. Treated gas exits through the top of the scrubber. The sulfur-rich liquid solution is regenerated in a separate oxidation tank after which it is transferred to a sedimentation tank to allow the elemental sulfur solids to drop out. Clean, regenerated solution returns to the scrubbing tower in a continuous and efficient process.
Greenlane™ Cascade H2S neither requires the addition of oxygen nor adds it in the process. This is critical because oxygen is difficult and costly to remove after being added directly into the digester or to the biogas stream for biotrickling or activated carbon filters in alternative approaches to H2S removal. Excess oxygen can lead to pipeline shut out due to non-compliance with injection specifications. Greenlane™ Cascade H2S is easy to install and operate, creates sulfur-rich effluent that can be spread on fields as fertilizer, and eliminates many of the operational issues and costs that come with traditional biological scrubbing and media-based H2S removal systems.
Greenlane™ Cascade MS uses multi-stage, high-efficiency tubular porous membranes to separate the carbon dioxide from the biomethane in a process called permeation. As the biogas passes through the tubes, the smaller carbon dioxide molecules pass through the walls of the highly selective permeable membranes, while the larger biomethane molecules do not.
Our systems offer reliable performance and high biomethane recovery, which is typically over 99%.
Greenlane leads the field in water-wash (or water-scrubbing) technology, the most deployed biogas upgrading technology in the world. Greenlane™ Cascade H2O uses counter-flow water to scrub away impurities from the inlet gas stream without the need for chemicals or heat.
Greenlane™ Cascade H2O utilizes a simple and robust process. Raw untreated gas from biodigesters or landfills is compressed then flows upwards through a cascade of water. The carbon dioxide, hydrogen sulfide, volatile organic compounds, and siloxanes dissolve into the water, while the biomethane does not. The biomethane is then dehydrated, providing pure, dry RNG. The water is cleaned of the impurities by counter-flowing air through it and reused in a closed loop.
The Greenlane™ Cascade H2O product line comprises five models designed to meet a wide range of flow-rate requirements. All the models are of a standard modular design with a compact footprint. Where larger capacity is required, we provide multiple systems in parallel.
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Greenlane Renewables
110 - 3605 Gilmore Way
Burnaby BC
V5G 4X5, Canada.
IR@greenlanerenewables.com
