Durable Boiler Economizer Tubes For High Temp Flue Gas
What is the core function of an economizer?
Recover waste heat from flue gas to preheat feedwater, improving efficiency by 5-10%.
Product Description
Boiler economizers, as finned - tube - based heat exchange devices, serve to heat a liquid (water in many instances). Notably, the heating process typically stops short of making the liquid reach its boiling point. Our manufacturing capabilities cover three distinct boiler economizer types: the bare - tube economizer, the H - finned tube economizer, and the spiral finned - tube economizer. The H - finned tube economizer, a highly efficient heat - exchanging unit, is constructed from H - finned tubes.
Specifications
| Description | Boiler economizer |
| Material | Alloy steel, Carbon steel, SA210C ,SA213T22, etc. |
| Material standard | ASTM, EN or ISO etc. |
| Dimension | Customization |
| Weight | Min: 10 ton Max.:1000 ton |
| Smelting Process: | EF+LF + VD |
| Process | Material→Ingot → Hot/Cold-Rolling→ Heat treatment (Normalizing+ tempering) → Inspection →rough machining→UT →2nd Heat treatment →finishing machining →Inspection |
| UT standard | ASTM A388 or EN10228, etc |
Technical specifications
Material Structure
Consists of a serious of spiral fin tubes, the headers of inlet and outlet, bend, frame and other auxiliaries.
Structure Arrangement
In line / staggered arrangement.
Function
(1) System Integration & Thermal Synergy
The economizer operates as a critical auxiliary component within steam generation systems, working in tandem with boilers. Upon exiting the engine cylinders via exhaust valves, high-temperature exhaust gases are first directed into the boiler. Here, they transfer thermal energy to water, initiating primary steam production—a foundational step in energy conversion.
(2) Residual Heat Recovery
Following their passage through the boiler, exhaust gases flow into the economizer. Leveraging advanced heat exchange mechanisms, the economizer captures residual thermal energy from these gases, heating feedwater before it enters the boiler. This dual-stage heat utilization not only enhances steam generation efficiency but also reduces the boiler's primary energy demand, optimizing fuel consumption.
(3) Efficiency Enhancement Dynamics
At its core, the economizer serves as a waste heat recovery system, repurposing thermal energy that would otherwise be lost to the environment. By preheating boiler feedwater—its primary function in most applications—the economizer achieves two key objectives:
Variety
Utility Boiler Economizer
| 1 | HDB produces economizers for utility boilers, which includes boilers fueled by coal, wood, oil, or other solid fuels to produce electricty from the boiler's high pressure steam. |
| 2 | These economizers are usually located in the back pass of the boiler and oriented with the tubes running horizontally.The boiler feedwater runs through the economizer circuits in the opposite direction of the gas flow (called counterflow). |
| 3 | Bare tubes are typically utilized in order to minimize ash fouling, but some boiler OEM's design their economizers with finned tubes, either spiral or long finned. |
| 4 | HDB can produce economizer elements with either bare, spiral finned, or long finned tubes, and if you prefer, re-design your unit to one of the other tube-types. HDB can also fabricate replacement headers for all utility boiler economizers. |
Package Boiler Economizer
| 1 | HDB has unique manufacturing capabilities that the Optimus engineers take full advantage of when designing sulfuric acid plant economizers and superheaters. |
| 2 | Often this allows the Optimus units to be configured for higher heat transfer efficiencies which results in a reduced surface area requirement and, consequently, a lower-priced product. |
| 3 | HDB utilizes its on-site capabilities to fin and bend the tubes, machine and fabricate the headers, drill the tubesheets, cut and prep all casing materials, and perform all of the pressure part and casing welds. |
| 4 | This gives HDB more control of the manufacturing sequence and schedule which has helped us achieve a remarkable record of on-time delivery performance. |
Manufacturing and acceptance criteria
| · | JB/T6512 "boiler with a high-frequency resistance welding spiral fin tube manufacturing technology conditions" |
| · | HG/T3181 "high-frequency resistance welding spiral fin tube" |
| · | JB/T6511 "spiral finned tube test technical conditions." |
| · | JB1611 "boiler tube mane box assembly conditions" |
| · | JB/T1612 "boiler pressurufacturing conditions." |
| · | JB16I3 "boiler pressure parts welding conditions." |
*Note:HD BOILER can bespoke special type of economizer according to customer's requirement.
HRSG Economizer
| 1 | Economizers for today's HRSG modules are configured with fintubes that hang vertically. HDB has fabricated economizer coils for virtually all of the HRSG OEM companies and understands the unique features of each. |
| 2 | In many cases, utilities desire to upgrade their economizers from plain carbon steel to an alloy material to help resist flow accelerated corrosion (FAC) inside the headers and tube bends. |
| 3 | HDB is a one-stop shop for economizer fabrication because we prep all the materials and perform all of the pressure part and attachment welding, from finning the fintubes, fabricating the headers, and assembling the coil bundle. |
Internal heat exchangers
1.Subcooling may also be produced by superheating the gas leaving the evaporator and heading to the gas compressor.
2.These systems withdraw heat from the liquid line but heat up the gas compressors suction.
3.This is a very common solution to insure that gas reaches the compressor and liquid reaches the valve.
4.It also allows maximum heat exchanger use as minimizes the portion of the heat exchangers used to change the temperature of the fluid,and maximizeds the volume in which the refrigerant changes its phase.
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