Pressure Bearing Evaporator Coil Boiler Pressure Parts For Metallurgical Waste Heat Boiler

Heavy-Wall Boiler Manifold Header Assembly with CNC Deep-Hole Drilling for High-Pressure Systems

The Pressure-Bearing Evaporator Coil is a core heat exchange component specifically designed for metallurgical high-temperature exhaust gas waste heat boilers, particularly in sintering and steel mill applications. Engineered with precision and durability in mind, this evaporator absorbs heat from high-temperature metallurgical flue gas to produce saturated steam, enabling efficient recovery of waste heat that would otherwise be discharged to atmosphere. As the metallurgical industry increasingly focuses on energy efficiency and carbon reduction, the waste heat boiler evaporator has become an indispensable element in modern steel plant energy recovery infrastructure.

The Metallurgical Evaporator Coil is specifically constructed to handle the challenging conditions of metallurgical flue gas, including high temperatures (up to 450C at the evaporator section), significant dust loading (5-30g/Nm3) and variable gas flow rates. The serpentine coil arrangement provides extended heat transfer surface within a compact envelope, while the pressure-bearing design (typically 1.0-6.4MPa) ensures safe containment of boiling water and saturated steam. As an evaporator, the working fluid undergoes phase change from water to saturated steam, with the fluid temperature corresponding to the operating pressure: 184C at 1.0MPa, 204C at 1.6MPa, 247C at 3.82MPa and 280C at 6.4MPa. 20G (SA-210 Gr.A1/C) carbon steel seamless tubes offer reliable performance under these saturated conditions, with the material temperature limit of 460C providing ample margin.

Manufactured using certified 20G / SA-210 carbon steel seamless tubes with CNC bending, automatic circumferential welding and post-weld heat treatment for all weld joints, every Evaporator Coil undergoes comprehensive NDT including UT, RT and PT, followed by hydraulic pressure testing to verify pressure integrity. The prefabricated modular coil design enables direct field installation or straightforward replacement during boiler revamping, minimizing on-site welding and reducing project downtime. Tube OD, wall thickness, bend radius and coil dimension can be customized based on gas flow rate, temperature profile, dust loading and required steam output. Material certificates comply with ASME SA-210 and GB 5310 standards for pressure-bearing boiler tubes.

One significant advantage of the Metallurgical Evaporator Coil is its role in enabling waste heat recovery in energy-intensive metallurgical processes, where flue gas temperatures are high (sintering machine exhaust 300-450C, converter gas 800-1000C after cooling) and heat recovery can generate substantial quantities of steam for power generation or process use. By converting waste heat to useful steam, the evaporator contributes to significant energy cost savings and carbon emission reductions in steel and metallurgical plants, with typical payback periods of 1-3 years for waste heat recovery projects. A typical sintering waste heat boiler can generate 30-50 tons of saturated steam per hour, equivalent to 6-10MW of power generation capacity.

The Pressure-Bearing Evaporator Coil is adaptable to various metallurgical waste heat sources and boiler configurations, making it suitable for a wide range of applications including sintering machine waste heat, steel converter gas cooling, electric furnace flue gas recovery, coking CDQ systems and metallurgical furnace exhaust heat recovery. Its versatility and robust construction enable it to perform reliably in both high-temperature and moderate-temperature waste gas environments. Furthermore, the coil can be customized to meet specific process requirements, such as different steam pressures (1.0-6.4MPa), temperatures (184-280C saturated), tube configurations and heat duties, ensuring optimal performance tailored to individual metallurgical waste heat recovery projects.

In addition to its functional benefits, the Evaporator Coil is designed with safety and operational convenience in mind. The materials and fabrication methods comply with ASME BPVC Section I and GB/T 16507 standards, ensuring safe operation under pressure-bearing boiling conditions. The serpentine design provides natural circulation characteristics, reducing the risk of tube overheating during operation. The modular coil structure allows for individual coil section replacement during maintenance, minimizing boiler downtime. Support structures are designed to accommodate thermal expansion and provide vibration damping in high-velocity gas environments.

To summarize, the Pressure-Bearing Evaporator Coil represents a core heat exchange component for metallurgical waste heat recovery systems. By efficiently generating saturated steam from high-temperature metallurgical flue gas, it enables energy recovery, cost reduction and carbon emission mitigation in steel and metallurgical operations. Its serpentine pressure-bearing design, prefabricated modular construction and systematic quality control make it an ideal choice for metallurgical waste heat boiler projects. Investing in high-quality evaporator coils is a strategic decision that supports long-term energy efficiency, cost savings and environmental compliance in the metallurgical industry.

Features

·        Serpentine coil design for extended heat transfer in compact envelope

·        Pressure-bearing construction for safe boiling water and saturated steam

·        20G (SA-210 Gr.A1/C) carbon steel seamless tube, material limit 460C

·        Saturated temp by pressure: 184C(1.0MPa) - 280C(6.4MPa)

·        Optimized for high-temperature, high-dust metallurgical flue gas

·        CNC bending + automatic welding + PWHT for all weld joints

·        Comprehensive NDT (UT/RT/PT) + hydraulic pressure test

·        Prefabricated modular design for easy installation and replacement

·        Typical steam output: 30-50t/h for sintering WHB, payback 1-3 years

·        Customizable tube spec, coil dimension and pressure per gas condition

Technical Parameters

Applications

The Boyu Pressure-Bearing Evaporator Coil is a core heat exchange component designed for metallurgical high-temperature flue gas waste heat recovery. Manufactured in Shandong, China, this evaporator coil is available in customizable configurations to meet diverse metallurgical waste gas conditions. Certified with ISO9001, ASME, Grade A, SGS, the product guarantees high quality, safety and reliability in waste heat recovery applications.

This Evaporator Coil is widely used in metallurgical sintering waste heat boilers, steel mill exhaust gas heat recovery systems, coking waste heat boilers, chemical heating steam boilers and industrial waste heat recovery systems where efficient heat extraction from high-temperature dust-laden gas is required. Its serpentine pressure-bearing design ensures reliable steam generation, while the modular structure supports both new waste heat boiler construction and existing boiler revamping projects. The evaporator enables measurable energy savings and carbon reduction in energy-intensive metallurgical operations.