Import Air Preheater Tubes — Buy in wholesale FOB from Supplier in China

Air preheater tubes form the heat transfer core of tubular air preheaters, recovering waste heat from boiler flue gas to preheat combustion air and thereby improve thermal efficiency while reducing fuel consumption. Shandong Hengtao Energy Saving & Environment Protection manufactures these tubes for installation in both new-build and retrofit boiler systems, with the tubular configuration serving as an alternative to rotary regenerative designs in smaller industrial furnace applications. The tubes carry flue gas on one side and combustion air on the other, with extended surface fins or studs welded to both tube exterior and interior to enhance gas-to-gas heat transfer where the convective coefficients are inherently low. Construction is typically carbon steel or low-alloy steel for moderate temperature service, with enamel or ceramic coating options for high-sulphur fuel corrosion resistance.

The fin-root attachment method mentioned in the source description refers to helical or longitudinal fins resistance-welded or brazed to the base tube, with root geometry designed to minimise thermal contact resistance and fin-tip temperature differential. Standard finned tube configurations for air preheaters employ pitch ranges from 5 mm to 12 mm, fin heights of 15-25 mm, and thickness of 1.0-1.5 mm, though Shandong Hengtao's exact offering must be confirmed. For vertical tubular preheaters, the tube bundle arranges in a rectangular casing with baffles directing air flow across the tube bank in cross-flow or combined cross-counter-flow pattern. Material selection balances thermal conductivity against sulphuric acid dew point corrosion: for flue gas temperatures below 150°C with sulphur content above 1%, enamel-coated carbon steel or 09CrCuSb (ND steel) is standard practice in Chinese boiler engineering.

Buyers include boiler OEMs, industrial furnace operators in cement and metallurgical sectors, power plant engineering contractors, and facilities undertaking energy efficiency retrofits under emission reduction mandates. When specifying from Shandong Hengtao, confirm the design flue gas inlet temperature, acid dew point, allowable gas-side pressure drop, and whether the tubes are supplied as loose components or complete modular bundles with tube sheets and casing. Also verify fin material compatibility with base tube expansion coefficients, particularly for cyclic load applications where differential thermal growth can fatigue weld joints. The supplier's location in Gaomi City, Weifang, Shandong Province places it within China's established boiler manufacturing corridor, with potential logistics advantages for domestic Chinese projects and export via Qingdao port.

Shandong Hengtao Energy Saving & Environment Protection is based in Gaomi City, Weifang, Shandong Province, China. The supplier holds a 'harbor' trust tier on this platform, with no recorded response rate or average response hours, indicating either no tracked enquiries or incomplete engagement metrics. The company profile does not disclose year of establishment, registered capital, number of employees, production capacity in tonnes per annum, or certification holdings such as ISO 9001, ASME, or A-grade boiler manufacturing licence.

The source description positions Shandong Hengtao as a manufacturer of air preheater tubes and complete preheater assemblies for industrial boilers, with application emphasis on waste heat recovery from furnace flue gases to preheat combustion air. The company serves industrial sectors including cement production and metallurgical processing, though no named clients, project references, or installed base quantities are provided. The listing text distinguishes between tubular and vertical preheater types and describes fin-root construction for enhanced heat transfer, suggesting engineering familiarity with boiler heat recovery design. Buyers should independently verify the supplier's manufacturing scope (tubes only, complete bundles, or turnkey preheater modules), quality system accreditation, and whether they possess a Chinese special equipment manufacturing licence for pressure-bearing boiler components (A-grade boiler certificate).