Industrial Boiler Economizer & Finned Tube Heat Exchanger Modules | ASME Boiler & Pressure Vessel Code Compliant Cores
Yuhong Group Co., Ltd. operates integrated seamless tube mills and heavy equipment manufacturing facilities, delivering fully traceable thermal transfer modules and replacement pressure vessel components. We specialize in designing and fabricating custom industrial boiler economizer modules, extended surface finned tube bundle cores, heavy forged heat exchanger tubesheet support plates, and removable tube bundle assemblies.
Operating under ISO 9001 quality systems and ASME Boiler and Pressure Vessel Code (BPVC) standards, Yuhong Group controls raw tubing metallurgy and welding precision from initial billet piercing to final hydro-testing. Beyond flue gas heat recovery modules, our product portfolio encompasses conventional shell and tube heat exchanger pressure vessels, curved u tube bundle inserts, and process shell & tube heat exchanger cores engineered for severe operating conditions in refineries, petrochemical plants, and power generation facilities.
Flue gas waste heat recovery systems routinely face low-temperature acid dew point corrosion ( H2SO4 ) and severe fly ash erosion when operating below fuel sulfur condensation thresholds. Yuhong Group manufactures customized economizer bundles engineered with specialized alloy base tubing and fin geometries to prevent structural degradation and fouling.
Thermal Efficiency Range: Increases boiler feedwater entry temperatures to reduce fuel consumption in power boilers and process fluid heaters.
Temperature & Pressure Limits: Designed to withstand flue gas inlet temperatures up to 550℃ and internal fluid operating pressures up to 20MPa ( 2,900psi).
Dimensional Accuracy: Fin pitch uniformity is held within ±0.2mm , and tubesheet hole locations are CNC-drilled within ±0.02mm of ASME BPVC Section I and TEMA Class R requirements.
We fabricate custom economizer replacement modules matching exact OEM boiler duct dimensions and thermal duty profiles:
High-Frequency Resistance Welded (HFRW) Solid Fin Modules: Features continuous helical steel fins welded to seamless base tubes, offering structural durability under high-velocity particle-laden flue gas.
Serrated / Dentated Fin Tube Modules: Uses segmented fins to create fluid turbulence, breaking boundary layers to maximize heat transfer rates in clean gas loops.
Extruded Aluminum Fin Modules (Type KL): Integrates an outer aluminum fin sleeve over a seamless inner steel tube, protecting the base tube wall from atmospheric ambient exposure.
Bare Tube Economizer Arrays: Engineered specifically for heavy oil or coal-fired boilers with high dust loading to prevent particulate clogging.
Carbon & Low-Alloy Steels: SA192, SA210 Gr A1/C, SA213 T11, T22, T91 for high-temperature steam and feedwater service.
Austenitic & Duplex Stainless Steels: SA240 / SA213 304L, 316L, 321, UNS S31803 / S32205 (Duplex 2205) for corrosive acid-condensing flue gas zones.
Nickel Alloys: Inconel 625 (UNS N06625) and Hastelloy C276 for extreme waste heat recovery environments.
| Core Component | Engineering Manufacturing Standards | Technical Function in Economizer Systems |
| Heat Exchanger Tubesheet / Support Plate |
Heavy Carbon Steel (SA516 Gr 70) or Stainless Plate; Precision CNC Drilled |
Anchors the finned tube bundle inside the flue gas duct while maintaining tube spacing and preventing vibration sagging. |
| Finned Heat Recovery Tubes |
HFRW Helical Fin Tubes / Extruded Aluminum Sleeve Tubes |
Serves as the primary thermal interface transferring heat from hot flue gas to boiler feedwater. |
| Inlet / Outlet Header Manifolds |
Heavy Wall Seamless Pipe (SA106B / SA335 P11/P22) with Forged Connections |
Distributes cold feedwater evenly into individual parallel tube circuits and collects heated fluid. |
| Bends & Terminal Connectors |
Short-Radius Cold or Hot Formed Return Bends with 100% UT/PT Welds |
Links straight finned tube runs outside the flue gas stream, allowing continuous fluid transit through the core. |
| Casing & Duct Structural Frame |
Heavy Structural C-Channels and Insulated Stainless Steel Panels |
Encapsulates the tube array, preventing flue gas leakage into the atmosphere and supporting modular stacking. |
Precision CNC Machining & Hole Tolerances: Structural support plates and heat exchanger tubesheet components are machined on multi-axis CNC centers to guarantee tube alignment without binding.
Full-Penetration Header Welding: All pressure-retaining return bends and tube-to-header joints are welded using orbital TIG (GTAW) or Submerged Arc Welding (SAW), followed by 100% Non-Destructive Examination (NDE).
Post-Weld Heat Treatment (PWHT): High-alloy economizer headers (e.g., SA335 P22/P91) undergo controlled furnace stress relief heat treatment to eliminate welding stresses.
Factory Hydrostatic & NDT Testing: Completed boiler economizer modules and replacement u tube bundle components undergo Hydrostatic Pressure Testing at 1.5x design pressure, Positive Material Identification (PMI), and Radiographic Testing (RT).
Preventing Low-Temperature Sulfuric Acid Dew Point Corrosion: Flue gas sulfur oxides ( SO x ) combine with moisture to form sulfuric acid vapor. Maintaining the economizer metal wall temperature above the calculated dew point ( 120℃-140℃ ) by controlling inlet feedwater temperature prevents rapid wall thinning.
Fly Ash Erosion Management: High flue gas velocities ( >9m/s ) carrying particulate fly ash can erode fin tips and base tube walls. Installing structural angle-iron erosion shields on the leading tube row extends service life.
Optimizing Tube Layout & Sootblowing Clearances: Staggered tube pitch maximizes heat transfer efficiency but increases ash trap risks. Inline tube layouts combined with dedicated sootblower lanes are recommended for heavy biomass or coal flue gas streams.
Yuhong Group provides standardized commercial execution terms for global boiler contractors, EPC engineering firms, and industrial plant managers:
Minimum Order Quantity (MOQ): 1 Modular Economizer Core Block or 1 Replacement Tube Bundle Assembly.
Incoterms & Shipping Ports: FOB Shanghai, FOB Tianjin, or CIF / CFR destination ports worldwide.
Fabrication Lead Time: Standard replacement modules delivered within 30 to 45 calendar days following GA drawing approval; emergency shutdown fast-track fabrication available in 20 days.
Third-Party Inspection (TPI): Fully compliant with BV, SGS, TÜV, Lloyd's Register, and ABS inspection procedures.
Petroleum Refining: Fired heater convection section economizers and Fluid Catalytic Cracking (FCC) waste heat recovery boilers.
Petrochemical Plants: Ethylene cracking furnace heat recovery units and utility steam generation boilers.
Power & Energy Generation: Utility thermal power plant boilers, Combined Cycle Gas Turbine (CCGT) Heat Recovery Steam Generators (HRSG), and biomass power plants.
Contact our technical team to submit boiler operating data or request commercial quotes for custom boiler economizer modules, replacement finned tube bundle cores, complete shell and tube heat exchanger units, or precision heat exchanger tubesheet plates:
Company: Yuhong Group Co., Ltd.
Website: www.tema-heatexchanger.com
Direct Email: jimmy@steelseamlesspipe.com
Design Standards: ASME BPVC Section I / Section VIII Div 1, TEMA Class R/B/C, PED 2014/68/EU, ISO 9001
