Bare Tube Economizer Bundle For Power Station Boiler With Feed Water Capability
Product Details
| Wear Protection: | Anti-Abrasion | Welding: | GTAW/SMAW/SAW Per WPS & PQR + Mandatory PWHT |
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| Products: | Boiler Pressure Parts | Material Standards: | GB / ASME / IBR / PED / JIS / KS |
| Application: | Power Station / Industrial / Coking / Biomass Boiler | ||
| Highlight |
Bare Tube Economizer Bundle,Economizer Bundle for Power Station,Supercritical Boiler Pressure Parts |
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Product Description
Bare Tube Economizer Bundle for Power Station Boiler with High-Pressure Feed Water Capability
The Bare Tube Economizer Bundle is a pressure-bearing heat recovery component for power station and high-pressure industrial boilers, designed to preheat boiler feed water using waste heat from flue gas before it enters the furnace. Engineered with precision and durability in mind, as the first heat transfer surface in the boiler gas path, the economizer recovers significant low-temperature heat that would otherwise be lost up the stack, directly reducing fuel consumption and improving overall plant efficiency. As power generation and industrial processes continually seek to optimize heat rate and reduce emissions, the economizer has become an indispensable element in modern boiler thermal systems.
The Bare Tube Economizer is specifically constructed to handle high-pressure boiler feed water while transferring heat from the flue gas stream. As a feed water heating component, the economizer operates at pressures higher than the boiler drum pressure due to feed pump discharge and pressure losses: 1.7-1.8MPa for low-pressure boilers, 4.3-4.5MPa for medium pressure, 7.0-7.2MPa for sub-high pressure, 10.6-10.8MPa for high pressure, 14.8-15.0MPa for super-high pressure, 18.2-18.5MPa for subcritical and 27.8-29.3MPa for supercritical. Feed water temperature rises from deaerator outlet (105-283C depending on boiler grade) to near saturation (190-345C). 20G (SA-210 Gr.C) carbon steel seamless tubes provide reliable performance across all these conditions, with the material temperature limit of 460C providing ample margin for feed water service.
Manufactured using certified 20G / SA-210 Gr.C seamless carbon steel tubes with CNC bending, automatic circumferential welding and comprehensive NDT including UT, RT and PT, every Economizer Bundle undergoes 100% hydraulic pressure testing at 1.5 times design pressure to verify integrity under high-pressure feed water conditions. Seamless carbon steel tubes (20G/SA-210 Gr.C) in staggered horizontal arrangement provide high heat transfer coefficients with good accessibility for soot blowing. The smooth bare tube surface minimizes ash deposition and facilitates effective cleaning, which is particularly important in coal-fired boiler applications where fly ash loading can be substantial. Tube OD, wall thickness, arrangement (staggered or inline) and bundle dimension can be customized based on boiler capacity, fuel type and gas temperature profile.
One significant advantage of the Bare Tube Economizer is its direct contribution to boiler efficiency improvement. By raising feed water temperature from deaerator level to near saturation, it reduces the heat input required in the furnace, typically improving overall boiler efficiency by 3-6 percentage points. In high-pressure power station applications, the economizer is an essential component of the boiler heat transfer train, and its reliable operation is critical for maintaining plant heat rate. A 10C increase in feed water temperature typically reduces boiler fuel consumption by approximately 1%. The smooth bare tube design also ensures long-term heat transfer performance with minimal fouling-related degradation, maintaining design efficiency throughout the service interval.
The Bare Tube Economizer Bundle is adaptable to various boiler pressure grades and capacities, from low-pressure industrial boilers (1.6MPa) to supercritical utility units (25.4MPa, economizer pressure 27.8-29.3MPa), making it suitable for a wide range of industries including power generation, coking, petrochemical, steelmaking and large industrial steam generation. Its versatility and robust construction enable it to perform reliably in both coal-fired and gas-fired boiler configurations. Furthermore, the bundle can be customized to meet specific process requirements, such as different feed water pressures (1.7-29.3MPa), temperature rises (105-345C), tube arrangements and bundle dimensions, ensuring optimal performance tailored to individual boiler designs.
In addition to its functional benefits, the Bare Tube Economizer Bundle 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 high-pressure feed water conditions. The staggered tube arrangement provides structural stability while maintaining uniform gas flow distribution. Maintenance procedures are streamlined due to the bundle's modular design, allowing for efficient soot blowing, tube inspection and individual tube replacement during scheduled outages. The smooth tube surface also facilitates non-destructive examination (UT/ET) of tube wall thickness during boiler inspections.
To summarize, the Bare Tube Economizer Bundle represents an essential heat recovery component in modern boiler thermal systems. By efficiently preheating high-pressure feed water with waste flue gas heat, it improves boiler efficiency, reduces fuel consumption and lowers greenhouse gas emissions across all pressure grades. Its smooth tube design, systematic material selection and comprehensive quality control make it an ideal choice for power station and high-pressure industrial boiler projects. Investing in high-quality economizer bundles is a strategic decision that supports long-term energy efficiency, cost savings and compliance with evolving power generation and environmental standards.
Features
· Smooth bare tube surface for easy soot blowing and ash removal
· Handles high-pressure feed water: 1.7MPa (LP) to 29.3MPa (supercritical)
· 20G (SA-210 Gr.C) seamless carbon steel tube, material limit 460C
· Feed water temp rise: 105C (deaerator) to 345C (near saturation, SC)
· Staggered horizontal arrangement for high heat transfer coefficient
· 100% hydraulic test at 1.5x design pressure ensures pressure integrity
· CNC bending + automatic welding + comprehensive NDT (UT/RT/PT)
· Improves boiler efficiency by 3-6%, 10C feed temp rise = ~1% fuel saving
· Customizable tube spec, arrangement and bundle dimension per boiler design
· Compliant with ASME BPVC Section I and GB/T 16507 standards
Technical Parameters
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Product Name |
Bare Tube Economizer Bundle |
|
Application |
Power Station / High-Pressure Industrial Boiler Economizer |
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Tube Material |
20G (SA-210 Gr.C) Seamless Carbon Steel |
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Material Temp Limit |
<= 460C |
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Working Fluid |
Boiler Feed Water |
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Feed Water Inlet Temp |
105C (LP) - 283C (Supercritical) |
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Feed Water Outlet Temp |
190C (LP) - 345C (Supercritical) |
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Design Pressure |
1.7MPa - 29.3MPa (Feed Water Side) |
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Tube OD |
32mm - 51mm |
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Arrangement |
Staggered / Inline, Horizontal |
Applications
The Boyu Bare Tube Economizer Bundle is an essential heat recovery component designed for power station and high-pressure industrial boilers. Manufactured in Shandong, China, this economizer bundle is available in customizable configurations to meet diverse boiler feed water heating requirements. Certified with ISO9001, ASME, Grade A, SGS, the product guarantees high quality, safety and reliability in high-pressure boiler applications.
This Economizer Bundle is widely used in power station boiler economizer sections, high-pressure industrial boilers, coking waste heat boilers, metallurgical exhaust gas boilers and large HRSG systems where efficient feed water preheating is required. Its smooth bare tube design ensures effective heat transfer with easy maintenance, while the high-pressure construction supports utility boiler operating conditions. The bundle is suitable for both new boiler construction and economizer retrofitting projects aimed at improving plant heat rate and reducing fuel consumption.
Product Highlights
Bare Tube Economizer Bundle for Power Station Boiler with High-Pressure Feed Water Capability The Bare Tube Economizer Bundle is a pressure-bearing heat recovery component for power station and high-pressure industrial boilers, designed to preheat boiler feed water using waste heat from flue gas ...
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