Views: 0 Author: Site Editor Publish Time: 2026-06-04 Origin: Site
Heavy-duty high-frequency welded steel finned tube heat exchanger is specially customized as core boiler economizer equipment for thermal power plants, biomass boilers, waste incineration boilers and industrial self-provided power boilers. Installed at boiler tail flue, this finned tube economizer recovers waste heat from high-temperature flue gas to preheat boiler feed water, cut fuel consumption, improve overall boiler thermal efficiency and lower exhaust flue gas temperature. With wear-resistant, acid-corrosion resistant and high-pressure resistant design, our finned tube economizer adapts to long-term continuous heavy-load operation under dusty and sulfur-containing flue gas environment, widely used in waste heat recovery & energy saving renovation projects across global power and boiler industries.
Key Material & Construction Details
Pressure-resistant Base Tube: Mainly adopt 20G boiler seamless steel tube, 15CrMoG alloy steel tube and ND anti-corrosion steel tube (09CrCuSb). These boiler-grade steel pipes feature outstanding high-temperature resistance, high-pressure resistance and anti-creep performance, effectively avoid pipe burst and medium leakage under alternating temperature & pressure working conditions. ND steel base tube is preferred for low-temperature dew point section to prevent acid corrosion from sulfur oxide in flue gas.
High-frequency Solid Welded Steel Fins: Carbon steel strip is fully welded onto outer tube wall via high-frequency resistance welding, zero clearance between fin and base tube to minimize thermal resistance. Extended fin surface expands heat exchange area 4~8 times compared with bare tube, greatly boosting waste heat absorption efficiency. Anti-abrasion shields and wear-resistant rings are pre-installed on windward side of finned tubes against high-speed ash-laden flue gas scouring.
Thickened Header & Support Frame: Heavy-wall forged header ensures even feed water distribution and smooth condensed water collection. Reinforced steel support bracket fixes tube bundle tightly to resist flue gas turbulence vibration and structural deformation during long-period running.
Modular Assembled Structure: Customizable single-row/multi-row tube bundle layout according to customer’s flue size and heat load requirement, convenient for on-site installation inside boiler flue duct.
Working Principle of Finned Tube Boiler Economizer
Feed water flows inside finned base tubes from bottom to top, absorbing residual heat and rising in temperature before entering boiler steam drum. High-temperature exhaust flue gas crosses outside finned tube bundle transversely, transferring residual heat to steel fins and tube wall through convection and radiation heat transfer. After heat releasing, flue gas temperature drops sharply before going to dust removal system and chimney, while preheated feed water reduces boiler’s primary heating load and realizes efficient flue gas waste heat recycling.
Core Product Advantages
1. High Waste Heat Recovery & Excellent Energy Saving Effect
Enlarged finned heat exchange surface improves heat transfer coefficient obviously, reduce boiler exhaust temperature by 50~120℃ and lift boiler thermal efficiency by 3%~7%. Remarkably cuts coal, biomass fuel and natural gas consumption to lower long-term operation cost for power plants and boiler users.
2. Superior Wear & Corrosion Resistance for Harsh Flue Gas
Integrated welded fins never fall off or loosen; wear-proof design on vulnerable sections suits coal-fired boiler, biomass boiler and landfill gas incineration boiler with high ash content flue gas. Optional ND steel structure solves low-temperature dew point acid corrosion trouble, extending equipment service life over 8~12 years.
3. Stable Performance Under High Temp & High Pressure
Rated working pressure covers 1.6MPa~10MPa, applicable for flue gas temperature range 200℃~550℃, stable operation under frequent boiler startup and shutdown load fluctuation.
4. Compact Size to Save Installation Space
Finned tube economizer occupies smaller flue space than traditional bare pipe economizer, helping clients reduce flue duct manufacturing and civil engineering investment.
5. Easy Maintenance & Low Downtime Loss
Open fin spacing design supports regular soot blowing via steam or acoustic soot blower to remove accumulated ash on fin surface conveniently, keep stable long-term heat exchange efficiency.
Wide Application Range
Thermal power station boiler tail economizer system
Biomass fired boiler, municipal solid waste incineration boiler waste heat recovery
Steel mill, chemical plant self-provided industrial boiler economizer retrofitting
Gas-fired boiler & waste heat boiler feed water preheating equipment
Regular Operation & Maintenance Guide
Arrange periodic soot blowing to clear ash deposit on fin surface and prevent heat efficiency decline caused by ash covering.
Regularly inspect welding seams of header and vulnerable finned tube sections to check for leakage risk.
Strictly control boiler feed water quality to avoid inner tube scaling and inner wall corrosion.
Control exhaust gas temperature above acid dew point during low-load startup to reduce low-temperature corrosion.
