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Quality Enamel Coated Boiler Preheater Low Temperature Tubular Air Preheater factory
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Quality Enamel Coated Boiler Preheater Low Temperature Tubular Air Preheater factory
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Enamel Coated Boiler Preheater Low Temperature Tubular Air Preheater

Brand Name: Boyu
Place of Origin: China
Certification: ISO9001:2015, ISO14001:2015, ISO45001:2018
Minimum Order Quantity: 1 Set
Price: USD 5,000-50,000 / Set
Supply Ability: 10,000 MT per Month
Delivery Time: 30-60 working days after deposit
Payment Terms: T/T,L/C at sight
Standard Packaging: Seaworthy packing in fumigation-free wooden cases with anti-rust protection film and desiccant

Product Details


Product Name: Tubular Air Preheater Assembly Application: Boiler Flue Gas Heat Recovery & Combustion Air Preheating
Tube Material: Q235 (SA-179) / 20G (SA-210) Carbon Steel Fin Configuration: H-Type Double-Sided, High-Frequency Resistance Welded
Fin Material: Carbon Steel (Q235) Feature: Anti-Corrosion
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Product Description

Enamel-Coated Tubular Air Preheater for Low-Temperature Acid Dew Point Corrosion Resistance

 

The Enamel-Coated Tubular Air Preheater is a specialized flue gas heat recovery component fabricated by Boyu Heavy Industry using our enamel coating technology and tube bundle fabrication capabilities, designed for the low-temperature section of boiler air preheaters where acid dew point corrosion is a critical concern. As a boiler component manufacturer with in-house enamel coating capability, Boyu produces enamel-coated air preheaters that address the most common failure mechanism in low-temperature heat recovery equipment. This assembly serves the primary function of recovering heat from flue gas below the acid dew point temperature (typically 90-130C) while resisting sulfuric acid condensation corrosion, enabling deeper heat recovery and higher boiler efficiency without premature tube failure. As high-sulfur fuel boilers and waste-to-energy plants face increasingly severe low-temperature corrosion challenges, the enamel-coated air preheater has become an essential solution.

The Enamel-Coated Tubular Air Preheater is specifically constructed with carbon steel tubes coated with a vitreous enamel (porcelain) layer on both internal and external surfaces, providing a continuous, impermeable barrier against sulfuric acid and other corrosive condensates. Boyu applies the enamel coating through a multi-stage process including surface preparation, primer coating, firing at 800-900C, finish coating and final curing, resulting in a smooth, glass-like surface with excellent acid resistance and abrasion resistance. The coating thickness is typically 0.2-0.5mm, with adhesion strength exceeding 15MPa. The tube bundle configuration follows the same cross-flow design as standard tubular air preheaters, with flue gas inside enamel-coated tubes and air flowing externally.

Manufactured using certified carbon steel tubes with in-house enamel coating, precision tube sheet drilling, tube expanding and seal welding, every Enamel-Coated Air Preheater undergoes coating thickness inspection, spark testing for pinhole detection, adhesion testing and comprehensive leak testing. The enamel coating is applied before tube assembly to ensure complete coverage, with special attention to tube ends and weld zones. Boyu's enamel coating line enables consistent coating quality and competitive lead times, with typical delivery of 35-50 days for complete assemblies. Complete coating quality reports, material certificates and leak test records accompany every shipment. The modular design allows for individual enamel tube bundle section replacement during maintenance.

One significant advantage of Boyu Enamel-Coated Air Preheaters is the proven corrosion resistance that extends service life by 2-3 times compared with bare carbon steel tubes in low-temperature, high-sulfur flue gas environments. The vitreous enamel surface is chemically inert to sulfuric acid, hydrochloric acid and other condensates that cause rapid corrosion of uncoated steel. Additionally, the smooth enamel surface reduces ash deposition and fouling, as the non-stick glass-like surface facilitates easier soot removal and maintains heat transfer efficiency over time. This is particularly valuable for boilers burning high-sulfur coal, heavy oil or waste fuels where acid dew point corrosion is the primary limiting factor for heat recovery depth.

The Enamel-Coated Tubular Air Preheater is adaptable to various boiler types, fuel types and low-temperature operating conditions, making it suitable for power generation, coking, petrochemical, steelmaking, waste-to-energy and marine boiler industries. Its versatility enables application as the low-temperature section of a multi-stage air preheater system, or as a standalone deep heat recovery unit. Furthermore, the assembly can be customized for specific flue gas compositions, including different sulfur content levels, dust loads and temperature profiles, with coating formulations optimized for each corrosion environment.

In addition to functional benefits, the Enamel-Coated Air Preheater is designed with long-term durability and maintenance convenience in mind. The enamel coating provides a hard, abrasion-resistant surface that withstands soot blowing and mechanical cleaning without damage. The modular tube bundle design allows for targeted replacement of corroded sections during scheduled maintenance. Boyu provides technical support for acid dew point calculation, coating selection, thermal design and corrosion monitoring, helping clients optimize heat recovery depth while managing corrosion risk. Regular inspection through access doors enables early detection of coating degradation and planned replacement.

To summarize, the Boyu Enamel-Coated Tubular Air Preheater represents a specialized solution for low-temperature flue gas heat recovery in corrosive environments. By delivering enamel-coated, corrosion-resistant tube bundles with verified coating quality and leak-tested construction, it enables deeper heat recovery, extends service life by 2-3 times and maintains heat transfer efficiency in high-sulfur applications. Our in-house enamel coating capability, systematic quality control and expert technical support make this product an ideal choice for boiler operators facing acid dew point corrosion challenges. Investing in enamel-coated air preheaters is a strategic decision that supports long-term energy efficiency, corrosion resistance and maintenance cost reduction.

Features

·        Boyu in-house enamel coating: multi-stage process, 800-900C firing, 0.2-0.5mm thickness

·        Vitreous enamel surface: chemically inert to sulfuric/hydrochloric acid, 2-3x service life vs bare steel

·        Smooth non-stick surface reduces ash deposition, easy soot removal, maintains heat transfer

·        Spark testing for pinhole detection + adhesion testing (>15MPa) + coating thickness inspection

·        Designed for low-temp section below acid dew point (90-130C flue gas)

·        Cross-flow design: flue gas inside enamel tubes, air outside

·        Modular tube bundle for individual section replacement

·        Suitable for high-sulfur coal, heavy oil, waste fuel and waste-to-energy boilers

·        Coating applied before assembly for complete coverage, including tube ends

·        Expert support for acid dew point calculation and coating selection

Technical Parameters

Product Name

Enamel-Coated Tubular Air Preheater

Application

Low-Temperature Flue Gas Heat Recovery with Corrosion Protection

Tube Base Material

Q235 (SA-179) / 20G (SA-210) Carbon Steel

Enamel Coating

Vitreous Enamel (Porcelain), 0.2-0.5mm Thickness

Coating Adhesion

> 15MPa

Flue Gas Temp Range

90C - 250C (Below Acid Dew Point Zone)

Acid Resistance

Sulfuric Acid / Hydrochloric Acid Resistant

Service Life vs Bare Steel

2 - 3 Times Longer

Flow Arrangement

Flue Gas Inside Enamel Tubes / Air Outside

Standard Delivery

35 - 50 Days

 

Applications

The Boyu Enamel-Coated Tubular Air Preheater is a specialized corrosion-resistant heat recovery component fabricated using our in-house enamel coating technology. Manufactured in Shandong, China, this assembly is designed for the low-temperature section of boiler air preheaters where acid dew point corrosion is critical. Certified with ISO9001, ASME, Grade A and SGS, the product guarantees high quality and reliable corrosion protection.

This Enamel-Coated Air Preheater is widely used in high-sulfur coal-fired boilers, heavy oil boilers, waste-to-energy boilers, coking waste heat boilers and marine boilers where low-temperature acid dew point corrosion limits heat recovery depth. Its vitreous enamel coating enables deeper flue gas cooling while resisting sulfuric acid condensation, extending service life and maintaining heat transfer efficiency.

 

Product Highlights

Enamel-Coated Tubular Air Preheater for Low-Temperature Acid Dew Point Corrosion Resistance The Enamel-Coated Tubular Air Preheater is a specialized flue gas heat recovery component fabricated by Boyu Heavy Industry using our enamel coating technology and tube bundle fabrication capabilities, ...

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