HTS Eclipse – Bayonet Ultra Recuperator

Overview

The Honeywell Bayonet Ultra Recuperator is a high-efficiency plug-in heat exchanger designed to fit into the exhaust leg of single, U, O, W, or Trident-type radiant tubes. Unlike conventional recuperators that use only a single heat transfer tube, the Bayonet Ultra contains multiple tubes to dramatically increase heat transfer area while reducing fuel consumption. When paired with Tube Firing burners, the Bayonet Ultra is capable of delivering fuel savings of up to 30% by preheating combustion air from exhaust streams up to 2,100°F.

New and retrofit installations rarely require special brickwork or radiant tube modifications. The Bayonet Ultra is available in four sizes to fit radiant tube inside diameters from 3 to 8 inches, with adjustable tube lengths and a selection of pressure drops to match existing blower systems. An air-cooled housing further helps cool the work area during operation.

Features & Benefits

• Multiple heat transfer tubes dramatically increase heat exchange area compared to single-tube designs — delivering up to 30% fuel savings
• Compatible with single, U, O, W, and Trident-type radiant tubes — broad retrofit and new-installation applicability
• Available in four sizes (3 BU, 4 BU, 5 BU, 6 BU) to fit radiant tube inside diameters from 3 to 8 inches
• Tube lengths are field-adjustable to meet exact installation requirements
• Multiple pressure drop options available to match existing blower systems without replacement
• During multi-tube furnace installations, only the tube being fitted needs to be shut down — minimizing production downtime
• Air-cooled housing helps cool the surrounding work area
• Cold drawn NiCr stainless steel tubes and stainless steel exhaust extension for durability in high-temperature environments
• Single-tube alternative version available for higher temperatures, dirty flue gas conditions, or low pressure drop requirements

Technical Specifications

• Recuperator design: Bayonet-type, multiple heat transfer tubes
• Available sizes: 3 BU, 4 BU, 5 BU, 6 BU (fits radiant tube inside diameters 3 to 8 inches)
• Air inlet connection: 2 in. NPSC
• Air outlet connection: Square air outlet
• Maximum exhaust temperature: Up to 2,100°F (clean exhaust streams)
• Preheated air temperature: Up to approximately 740°F (393°C) depending on size and operating conditions
• Tube material: Cold drawn NiCr stainless steel
• Exhaust extension material: Stainless steel
• Compatible exhaust stream type: Clean exhaust streams
• Compatible radiant tube types: Single, U, O, W, and Trident-type

Applications

• Exhaust heat recovery on radiant tube furnaces
• Automotive and metal heat treatment furnaces
• Continuous and batch-type industrial furnace applications
• Retrofit recuperator replacement on existing radiant tube installations
• New-installation radiant tube burner systems paired with Tube Firing burners
• Applications requiring combustion air preheat with clean exhaust streams

Models / Configurations

• 3 BU – Fits radiant tubes with inside diameter in the 3-inch range; multiple length options available
• 4 BU – Fits radiant tubes with inside diameter in the 4-inch range; available in high-pressure drop configuration; lengths from 15 to 24 inches (and beyond) to suit installation depth
• 5 BU – Fits radiant tubes with inside diameter in the 5-inch range; multiple length and pressure drop options
• 6 BU – Fits radiant tubes with inside diameter in the 6-to-8-inch range; multiple length and pressure drop options
• FSG Bayonet Ultra Exhaust Extension – Stainless steel exhaust extension accessory to adapt the Bayonet Ultra to specific tube configurations

Bayonet Ultra Recuperator Accessories

• FSG Bayonet Ultra Exhaust Extension – Stainless steel exhaust extension designed to adapt the Bayonet Ultra Recuperator for specific radiant tube exhaust configurations and installation depths

Documentation