BIOGAS and RNG Solutions

Industry-leading Combustion Solutions

As the requirements to lower methane emissions from biogas facilities tighten, operators of anaerobic digesters, landfills, and renewable natural gas (RNG) purification facilities face increasing pressure to meet strict environmental regulations while maintaining safe, reliable operations. Zeeco provides advanced combustion-based emissions control technologies engineered specifically for the unique challenges of these industries. Whether you need to destroy raw biogas or the off-specification gas from a biogas purification unit, Zeeco delivers proven solutions for safe, reliable, and efficient control of your methane emissions. 

Safely Control Methane Emissions for Landfills and Anaerobic Digesters

Zeeco's open and enclosed biogas flares are the ideal solutions for controlling methane and other volatile organic compound (VOC) emissions from biogas operations. They are designed to handle variations in flow rate and gas composition and can handle gas streams containing high concentrations of carbon dioxide (CO₂). 

ZEECO TriClean™

If your facility is in an environmentally sensitive area where NO_x emissions are tightly regulated, such as one of the EPA’s 8-hour ozone nonattainment areas, then you may need an ultra-low NO_x VCU. Zeeco has developed the TriClean, an ultra-low-emission VCU that can achieve NO_x emissions of ≤ 17 ppm (0.02 lbs./MMBTU) and CO emissions ≤ 27 ppm (0.02 lbs./MMBTU), corrected to 3% oxygen.

Key Features and Benefits:

• Enclosed system
• Turn down ratio of 6:1, higher with design modifications
• ≥ 99.99% DRE
  
• Ultra-low NO_x emissions of ≤ 0.02 lbs./MMBTU
• Ultra-low CO emissions of ≤ 0.02 lbs./MMBTU.
• Designed to handle raw biogas, off-specification RNG, or tail gas from a RNG purification unit

Renewable Natural Gas Flares

Flares play an important role in RNG purification operations, ensuring methane emissions are controlled at every phase of the operation. They handle the raw biogas when the purification plant goes down for scheduled or unscheduled maintenance and control the off-specification RNG generated during the purification plant's initial start-up. Zeeco designs flares specifically for the variable flow rates and methane concentrations typical of RNG facilities, ensuring high DRE and regulatory compliance, even under the most challenging conditions.

Key Features and Benefits of Natural Gas Flares:

• Turndown ratio of 10:1 or greater
• Pilots with retractable thermocouple and ignition probe standard
• ≥ 98% DRE
• Designed to handle raw biogas and off-specification RNG
• Standard designs available: reliable, repeatable performance, and shorter lead times
• Lower capital cost solution
• Rental systems are available for short or long-term needs

Renewable Natural Gas Vapor Combustor Units

During the RNG purification process, CO₂ is separated from the methane to achieve pipeline quality. This stream of CO₂  is called tail gas. Depending on the purification technology, some methane is removed with the CO₂.  Based on the concentration of methane and the requirements of the facility’s air permit, the tail gas may need to be sent to a control device. Due to the extremely high CO₂ concentrations, the tail gas is extremely difficult to burn. The most efficient and effective way to handle it is with a VCU.  

Key Features and Benefits of Renewable Natural Gas VCUs:

• ≥ 99% DRE
• Engineered for vapor compositions with high and varying CO₂ concentrations.
• Temperature control and preheat capability, to ensure minimum stack temperature, if required by air permit
• Ceramic fiber stack insulation allows for fast heat-ups and cool-downs
• PLC-based control system, local Human Machine Interface (HMI), and necessary instrumentation
• Two (2) emission testing ports 90° offset.
• Designed to meet stringent EPA and local air quality regulations
• Rental systems are available for short or long-term needs