Industrial Economizer Manufacturer
Gelan manufactures custom economizers for industrial waste heat recovery projects. We help recover flue gas heat, preheat boiler feedwater or process fluid, and reduce fuel loss in boiler, HRSG, fired heater, and process exhaust systems.
- Boiler, HRSG, fired heater, and flue gas economizer systems
- Recover heat from 150–400°C+ flue gas before stack loss
- Design focus: pressure drop, fouling, corrosion, and layout fit
- ASME / EN code support with NDT, hydrotest, and full records
How an Economizer Turns Waste Heat Into Useful Energy
If your flue gas still carries usable heat before it reaches the stack, an industrial economizer can recover that heat and transfer it to feedwater or process fluid. Gelan designs both the gas side and medium side around your real operating conditions.
Gas Side
Gas Side: Recover Heat Before It Leaves the Stack
Hot flue gas passes through the economizer before discharge. If your stack temperature is still high, Gelan can help check whether this heat is worth recovering.
Medium Side
Medium Side: Preheat Feedwater or Process Fluid
Cold feedwater or process fluid absorbs the recovered heat inside the economizer. This helps reduce the heating load on your boiler, HRSG, or process system.
Gas Side: Recover Heat Before It Leaves the Stack
Hot flue gas passes through the economizer before discharge. If your stack temperature is still high, Gelan can help check whether this heat is worth recovering.
Medium Side: Preheat Feedwater or Process Fluid
Cold feedwater or process fluid absorbs the recovered heat inside the economizer. This helps reduce the heating load on your boiler, HRSG, or process system.
Gelan Economizers for Boiler, HRSG, and Flue Gas Systems
Different heat recovery systems need different economizer designs. Gelan customizes each industrial economizer based on your heat source, flue gas condition, heated medium, layout space, and project standard.
Boiler Economizer
Preheat boiler feedwater and reduce fuel demand in industrial boiler systems.
Boiler Stack Economizer
Recover heat from stack flue gas before valuable energy is discharged.
HRSG Economizer
Preheat feedwater before it enters the steam generation section of an HRSG.
Fired Heater Economizer
Recover heat from fired heater flue gas before stack discharge and improve thermal efficiency.
Industrial Flue Gas Economizer
Recover heat from process exhaust gas, furnace flue gas, or waste gas streams.
Waste Heat Recovery Economizer
Custom-designed for waste heat recovery projects with special flue gas, medium, layout, or material requirements.
Technical Data for Custom Economizer Projects
Gelan customizes each economizer based on heat source, gas condition, heated medium, pressure, material, and site layout. The data below shows common project options. Final design is confirmed after engineering review.
| Item | Typical Custom Options / Project Range |
|---|---|
| Heat Source | Flue gas, exhaust gas, furnace gas, stack gas, or other waste heat stream |
| Gas Temperature | Commonly 150–400°C+ waste heat streams; higher-temperature cases can be reviewed by project |
| Heated Medium | Boiler feedwater, process water, condensate, thermal oil, or project-specified fluid |
| Medium Pressure | Customized based on boiler, steam, HRSG, or process system requirements |
| Tube Structure | Bare tube, finned tube, spiral fin tube, economizer tube bundle, or custom module |
| Material Selection | Carbon steel, stainless steel, alloy steel, or specified material based on temperature and corrosion risk |
| Installation Form | Integrated section, duct-mounted section, stack-mounted section, modular package, or retrofit module |
| Design Focus | Heat recovery, pressure drop, fouling control, acid dew point corrosion, cleaning access, and layout fit |
| Inspection & Code Support | ASME / EN project code support, NDT, hydrotest, material records, and EPC documentation |
*Have special gas conditions, limited space, or strict project standards? Send your operating data and layout drawing. Gelan can review a custom economizer design for your project.
What Project Teams Check Before Reactor Pressure Vessel Fabrication
A custom economizer should recover heat without adding new risks. Gelan designs each unit around heat recovery, pressure drop, fouling, corrosion, layout, and project documentation.
Recover More Heat in Limited Space
If your flue gas temperature is still around 150–400°C+ before discharge, useful heat may still be recoverable. But a larger unit is not always possible when duct space or retrofit space is limited.
Gelan design:
- Use finned tube, spiral fin tube, or extended heating surface design
- Match tube layout with gas flow, medium flow, and available footprint
- Support compact, duct-mounted, stack-mounted, or modular sections
Typical value:
- More heating surface in a smaller footprint
Control Pressure Drop Before It Affects Operation
An economizer should not create too much resistance in the gas path. High pressure drop can increase fan load, reduce system stability, or create extra operating cost.
Gelan approach:
- Balance heat transfer area with gas velocity
- Review pressure drop on gas side and medium side
- Adjust tube spacing, bundle layout, and duct connection
Typical value:
- Heat recovery without overloading the system
Reduce Fouling, Ash Buildup, and Cleaning Downtime
Dust, ash, soot, or process particles can build up on economizer tubes. Once fouling becomes serious, heat transfer drops and cleaning downtime increases.
Gelan approach:
- Select tube spacing and layout based on dust load and flue gas velocity
- Use staggered tube arrangement to improve gas-side scouring when required
- Support H-shaped finned tubes with a 6–12 mm fin gap to guide airflow and reduce ash buildup
- Reserve access for inspection, cleaning, and soot blowing when needed
Typical value:
- More stable heat recovery with easier maintenance
Prevent Acid Dew Point Corrosion
If the outlet gas temperature is too low, sulfur, moisture, or corrosive components may cause acid dew point corrosion. This is a common risk in flue gas economizer and exhaust gas economizer projects.
Gelan approach:
- Review gas composition, sulfur, moisture, and outlet temperature
- Select suitable carbon steel, stainless steel, or alloy material
- Avoid unsafe low-temperature operation when corrosion risk is high
Typical value:
- Longer tube life and lower leakage risk
Fit New Builds, Retrofits, and Modular Delivery
Many economizer projects are limited by existing duct layout, stack position, lifting space, or shutdown window. A standard unit may not fit the site.
Gelan approach:
- Customize integrated, duct-mounted, stack-mounted, or modular sections
- Review transport size, lifting limits, and site installation space
- Support modular delivery for faster installation
Typical value:
- Better fit for tight layouts and retrofit projects
Keep Project Review and Handover Smooth
For EPC contractors and plant owners, incomplete inspection records or missing documents can delay review, shipment, installation, and final acceptance.
Gelan approach:
- Support NDT, hydrotest, dimensional check, and material inspection
- Prepare MTC, welding records, NDT reports, and hydrotest reports
- Organize final data book for project handover
Typical value:
- Smoother review, delivery, and site handover
Where Our Economizers Are Used
Economizers are used in energy-intensive projects where flue gas or exhaust gas still carries recoverable heat. Gelan supports custom economizer design for refinery, petrochemical, hydrogen production, and power-related systems.
Custom Economizer Projects Supported by Gelan
Bangladesh Waste Heat Boiler Economizer Module
Project Background:
Gelan Support:
- 2 modular economizer sections fabricated for site installation
- Approx. 1,850 m² heat transfer area arranged in tube bundle modules
- Flue gas cooled from about 360°C to 210°C
- Boiler feedwater preheated from about 105°C to 165°C
- Tube bundle and steel frame designed for lifting, transport, and installation
- Welding inspection, dimensional check, hydrotest, and delivery documents supported
Result:
- Location: Bangladesh
- Equipment: Waste heat boiler economizer module
- Application: Industrial waste heat recovery
- Structure: Tube bundle + modular steel frame
- Key focus: Heat recovery, compact layout, pressure drop control, transport, and inspection
Related Equipment for Economizer and Heat Recovery Systems
Economizers are often used with upstream heat sources, waste heat recovery units, and heat transfer components. Explore related Gelan equipment that may connect with your economizer or flue gas heat recovery project.
Waste Heat Boiler
Recovers higher-temperature waste heat and can work with an economizer to preheat feedwater and improve steam system efficiency.
Preheater
Preheats air, fuel, feed, or process medium before the main heating stage in heat recovery systems.
Steam Methane Reformer
A major heat source in hydrogen production projects, often connected with downstream waste heat recovery systems.
Atmospheric Furnace
Used in crude distillation units where flue gas heat recovery can help reduce stack heat loss.
Vacuum Furnace
Used in heavy oil processing systems where flue gas heat recovery can support better energy use.
Coking Furnace
Used in delayed coking units where high-temperature fired heater flue gas may still carry recoverable heat.
Finned Tube
Increases heat transfer surface in compact economizer and flue gas heat recovery designs.
FAQ About Separator Vessels / Drums
What does an economizer do in an industrial system?
An economizer recovers heat from flue gas or exhaust gas and uses it to preheat boiler feedwater, process water, condensate, or other project fluids.
For buyers, the value is simple:
- less stack heat loss
- lower fuel demand
- better use of waste heat
- improved overall system efficiency
Gelan designs custom industrial economizers based on your heat source, medium data, pressure, layout, and project standard.
Is my flue gas temperature suitable for an economizer?
- flue gas inlet temperature
- expected outlet temperature
- gas flow rate
- gas composition
- available installation space
Can Gelan customize an economizer for my boiler, HRSG, or fired heater system?
Yes. Gelan can support custom economizer design and fabrication for industrial heat recovery systems, including boiler, HRSG, fired heater, stack gas, and process exhaust applications.
The design can be adjusted based on:
- heat source
- feedwater or process fluid condition
- pressure and temperature
- tube structure
- material requirement
- layout space
- inspection and code requirement
This is useful when a standard boiler economizer or stack economizer does not fit your project.
What information should I send to get an economizer quote?
To make the quotation more accurate, you can send the basic project data first. A complete design file is not required at the beginning.
Helpful information includes:
- heat source type
- flue gas temperature and flow rate
- heated medium
- medium inlet and outlet temperature
- design pressure
- material requirement
- fouling or corrosion risk
- layout drawing or available space
- project code or inspection requirement
If some data is missing, Gelan can start with your available information and help you confirm what is needed next.
Will an economizer increase pressure drop in my system?
Yes, any economizer adds some resistance, but a good design should keep pressure drop within an acceptable range.
This matters because high pressure drop may cause:
- higher fan load
- unstable draft
- lower system efficiency
- extra operating cost
- retrofit difficulty
Gelan reviews gas velocity, tube spacing, bundle layout, and duct connection before fabrication, so heat recovery does not create new operation problems.
How can fouling and ash buildup be reduced?
Fouling is common in flue gas economizer and exhaust gas economizer projects, especially when the gas contains dust, ash, soot, or process particles.
Gelan can reduce fouling risk by reviewing:
- dust load
- gas velocity
- tube spacing
- cleaning access
- soot blower or cleaning interface requirement
- maintenance space
This helps the economizer keep more stable heat recovery performance and reduces cleaning downtime.
Can an economizer be used for retrofit projects?
Yes. Economizers can be used in both new projects and retrofit projects. For retrofit work, the main challenge is usually not only heat transfer, but also site fit.
Gelan checks:
- existing duct layout
- stack position
- shutdown window
- lifting space
- transport size
- connection points
- pressure drop limit
This helps reduce site modification and installation risk when adding a custom boiler stack economizer or flue gas heat recovery module.
How do I choose a boiler economizer manufacturer?
When choosing a boiler economizer manufacturer, do not only compare price. A low-cost unit can cr eate higher cost later if it causes pressure drop, fouling, corrosion, installation problems, or missing project documents.
Buyers should check whether the manufacturer can support:
- custom design based on real operating data
- tube bundle and finned tube fabrication
- material selection for temperature and corrosion risk
- welding, inspection, NDT, and hydrotest
- modular delivery
- EPC documentation and final data book
Gelan supports custom economizer fabrication, inspection, delivery, and documentation for industrial heat recovery projects. You can send your project data for an initial design review.
Request a Custom Economizer Quote
Send your gas temperature, flow rate, medium data, pressure, and layout drawing. Gelan can review your heat recovery needs and provide a project-based economizer proposal.