Product Description
Manufactured within our 13,800+ square meter heavy fabrication base in Jingjiang, our Combustion Air Preheater is an industrial flue-gas heat recovery unit engineered to extract thermal energy from furnace exhaust streams and preheat incoming combustion air before it enters industrial burners. Drawing on 26 years of thermal equipment manufacturing expertise and accredited under ISO 9001 and ASME standards, we construct each Combustion Air Preheater using plate-type, tubular, or cast-iron heat-exchange matrixes designed to resist low-temperature dew-point corrosion. By raising incoming air temperatures by 150°C to 160°C and cutting stack flue gas temperatures by 110°C to 120°C, this high-performance Combustion Air Preheater boosts overall fired heater and boiler thermal efficiency by 7% to 7.5% while reducing fuel consumption by up to 12%, offering petrochemical plants and metallurgical works a durable energy-saving solution built for long run-lengths.
Applications
Petrochemical Fired Heaters: Preheating combustion air for crude heaters, vacuum furnaces, reformers, and coking heaters.
Industrial Boilers & Power Plants: Serving utility and package boilers to capture stack heat and improve combustion stability.
Metallurgical Reheating Furnaces: Upgrading thermal balance in continuous walking-beam and pusher-type billet reheating furnaces.
Solid Fuel & Biomass Combustion: Providing preheated drying air to accelerate ignition in stoker boilers and pulverized coal mills.
Technical Specifications
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Design Standards |
API 560, ASME Section VIII Div. 1, NB/T 47006, GB/T 151 |
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Structural Types |
Plate-type (welded / dimpled plate packs), tubular bundle (steel/glass/corrosion-resistant alloy tubes), or composite heat-pipe configurations |
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Air Preheating Temperature |
Up to 260°C (Process-dependent) |
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Flue Gas Inlet Temperature |
180°C to 450°C; Flue gas outlet cooled to 110°C–140°C |
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Heat Transfer Tube/Plate Materials |
Corten steel (ASTM A242/A588), ND steel (09CrCuSb), 316L/304 stainless steel, and borosilicate glass tubes for acid-condensation zones |
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Gas-Side Pressure Drop |
Typically ≤ 400 Pa to minimize induced-draft fan electrical loads |
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Air-Side Pressure Drop |
Typically ≤ 600 Pa to match forced-draft fan heads |
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Casing Construction |
5mm–8mm reinforced structural carbon steel with seal-welded gas-tight insulation framing |
Customization Capabilities
Dew-Point Anti-Corrosion Zoning: Hybrid material selections utilizing acid-resistant ND steel or enamel/glass tubes in cold-end modules where condensation risk is highest.
Flexible Gas/Air Flow Configurations: Counter-flow, cross-flow, or multi-pass duct transitions adapted to site layout and structural steel limitations.
Integrated Cleaning Systems: Pre-fitted with sonic soot blowers, steam lances, or water-washing manifolds to eliminate particulate fouling on heat-transfer surfaces.
Fully Modular Skid Assembly: Shipped as pre-insulated, pre-cased modules ready for drop-in installation on furnace convection decks.
Zero MOQ Restriction: Custom engineered for individual furnace revamps or supplied as multi-unit batches for grassroots projects.
Quality Control
System Accreditations: Certified under ISO 9001:2015, ISO 14001:2015, and ISO 3834-2 welding quality management.
Full QR Code Traceability: Plate packs, tube bundles, and pressure-retaining components carry individual QR codes for instant retrieval of mill certificates and NDT logs.
Weld Seam & Leak Testing: 100% pneumatic pressure decay testing, dye-penetrant testing (PT) on pack welds, and helium/air leakage verification to guarantee zero cross-contamination between flue gas and combustion air.
Third-Party Inspection: Factory acceptance tests regularly witnessed by BV, SGS, DNV, or TÜV.
Protective Export Packaging: Heavy structural steel cradles, internal bracing, desiccants, and weatherproof vacuum wrapping.
FAQ
Q: How do you prevent sulfuric acid dew-point corrosion at the cold end of the preheater?
A: We calculate the acid dew-point from fuel sulfur content, install acid-resistant materials (such as 09CrCuSb/ND steel or glass tubes) in cold zones, and configure air-bypass dampers to keep metal temperatures above the condensation threshold during low-load operation.
Q: What is the typical fabrication lead time for a custom air preheater?
A: Typical production time is 3 to 4 months from final drawing sign-off to factory dispatch.
Q: What warranty do you provide for international deliveries?
A: We provide an 18-month warranty from site arrival or 12 months from commercial operation (whichever occurs first).
Q: What payment terms are accepted?
A: Standard commercial terms are 30% advance deposit, 40% intermediate fabrication milestone payment, and 30% balance prior to shipment, payable in USD, EUR, or RMB.
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