Import Enamelled Tube Air Preheater — Buy in wholesale FOB from Supplier in China

The Enamelled Tube Air Preheater from Shandong Hengtao is designed for industrial flue gas heat recovery systems. The tubes feature a ceramic enamel coating applied to carbon steel substrates, with a specified thermal conductivity of approximately 0.0002 W/m·K, making the enamel layer negligible in thermal resistance calculations. Surface smoothness and uniformity are critical to reduce gas flow resistance and inhibit fouling, as stated in the supplier’s technical notes. The design enables wall temperatures to rise 10 to 30 degrees Celsius compared to uncoated steel under identical operating conditions, improving overall heat transfer efficiency.

The enamel coating is formulated for acid and alkali resistance, suitable for environments with flue gas containing sulfur oxides or ammonia byproducts. Typical industry standards for such coatings include ISO 12944-5 for corrosion protection and ASTM C1113 for thermal shock resistance, though these are not certified by the supplier. Tube wall thicknesses are typically 2.5 to 4 mm, with diameters ranging from 38 to 76 mm, depending on system pressure and flow rate requirements. The coating thickness is generally between 0.2 and 0.5 mm, applied via spray and fired at controlled temperatures to ensure adhesion and crack-free performance.

This preheater is purchased by boiler manufacturers, cement kiln operators, and power plant engineers seeking to recover waste heat and reduce fuel consumption. Buyers typically specify the tube geometry, coating thickness, and gas inlet temperature range. Trade terms offered include FOB Qingdao or CIF, with packaging in wooden crates for bulk shipment. Minimum order quantities are not stated; buyers should confirm volume requirements directly with the supplier. Lead times are not disclosed and must be verified per order.

Shandong Hengtao Energy Saving & Environment Protection is based in Gaomi City, Weifang, Shandong Province, China. The supplier is classified as a harbor-tier entity with no verified response rate or average response time recorded in the listing. No information is provided regarding company history, employee count, annual production capacity, or client references. The listing confirms only that the company manufactures enamelled tube air preheaters for industrial heat recovery applications.

The supplier does not claim certifications such as ISO 9001, CE, or ASME, nor does it state any export experience or years in business. There is no mention of R&D capabilities, testing equipment, or in-house quality control protocols. Buyers should treat this as a manufacturer with limited public verification and confirm operational details directly before placing orders. The absence of response data suggests limited engagement on the platform, requiring proactive communication from the buyer.