HTS Eclipse – E-Jector Model FGR

Overview

The Eclipse E-Jector is a flange-mounted flue gas recirculation (FGR) device designed exclusively for use with the Eclipse Tube Firing Burner (TFB) as part of a complete radiant tube system. It accommodates radiant tube inside diameters of 4 to 6 inches and maximum firing capacities up to 500,000 Btu/h (132 kW). The E-Jector reduces NOx emissions by recirculating a portion of flue gas back into the combustion air stream, with field-demonstrated reductions of 40–50% over baseline emission levels. Each E-Jector system was custom engineered by Eclipse to ensure compatibility with the specific radiant tube installation.

Features & Benefits

• Flange-mounted directly to the radiant tube exhaust or Eclipse BU Bayonet recuperator — no additional support structure required
• Flue gas recirculation reduces NOx emissions by 40–50% in typical applications
• Two nozzle sizes (21 mm and 24 mm) cover the full input range from low fire to 500,000 Btu/h (132 kW)
• Compatible with Eclipse Bayonet Ultra (BU) recuperators for combined high fuel efficiency and low NOx performance
• 3/8 in (9.5 mm) tapped emissions sampling connection included for field O2 measurement
• Every system custom engineered by Eclipse to maximize performance and assure radiant tube compatibility

Technical Specifications

• Model: FGR
• Compatible radiant tube inside diameter: 4 to 6 in (102 to 152 mm)
• Maximum capacity: 500,000 Btu/h (132 kW)
• Maximum flue gas temperature at E-Jector inlet: 1,400°F (760°C)
• Nozzle sizes: 21 mm (applications up to 350,000 Btu/h / 92 kW); 24 mm (applications up to 500,000 Btu/h / 132 kW)
• Air inlet connection: 2 in NPT
• Air outlet connection: 2 in NPSM
• Mounting: Flanged to radiant tube exhaust or recuperator
• Vertical exhaust flue spool: 6 in (152 mm) minimum straight run recommended
• Minimum straight run of pipe from E-Jector centerline before any direction change: 21 in (533 mm)
• Emissions sampling tap: 3/8 in (9.5 mm) tapped connection
• Typical NOx reduction: 40–50%
• Continuous spark required for chamber temperatures below 1,400°F (760°C)
• System must start below 350,000 Btu/h (92 kW) until chamber temperature exceeds 500°F (260°C)
• All performance data based on 15% excess combustion air and natural gas

Applications

• Flue gas recirculation (FGR) for radiant tube furnace systems
• Industrial heat treating furnaces with radiant tube configurations
• Applications requiring NOx emission reduction on existing radiant tube burner systems
• Use with Eclipse Tube Firing Burner (TFB) and Eclipse BU Bayonet Ultra recuperators

E-Jector Accessories

• Part No. 10030959 – Eclipse-recommended 2 in x 18 in (51 x 457 mm) flex hose for installation at the ambient air inlet to allow for thermal movement

Additional Information

• The E-Jector is designed for exclusive use with the Eclipse Tube Firing Burner (TFB) as part of a total engineered system — it is not a standalone product
• Flame safety controls should be used for burner monitoring (indication only) on E-Jector systems — governing codes apply
• Do not insulate the E-Jector device; insulation may cause equipment damage and void the warranty

Documentation