Ljungström® Air Preheaters (APH) for Utility Power Generation

Thanks to our unique and superior modular design, Ljungström® Air Preheaters for Utility Power Generation are the preferred option all around the world.

Long-lasting, superior performance

LJUNGSTRÖM engineers have worked hard to ensure correct heating element configuration, materials, and thickness for optimal thermal and pressure drop performance, resulting in durable and high performing equipment.

Premium quality materials

Our experience with mild steel, low alloy steel, and premium enameled heating element is second to none. With advanced quality control checks and processes, our heating elements and container materials perform to exceptional standards.

Efficient sealing systems

We offer a range of sealing system options that deliver the lowest air-to-gas leakage while still providing the flexibility to operate across a range of loads.


Our vast experience and expertise have led to our range of versatile modular design platforms and configurations. This ensures that we can meet the many different requirements of our customers globally.

Maximum flexibility

Our modular design concept offers a platform with first-class technologies that can be tailored to suit a wide variety of different power plant applications whether they are fired by pulverized coal, oil, gas, or biomass.

Multiple Sizes

We know that thermal power plants are becoming increasingly large, which is why our air preheaters provide maximum flexibility and are available in a wide range of sizes. Accordingly, we’re able to meet the requirements of even the world’s largest plants.


No one knows Ljungström® Air Preheaters as we do. With a reputation as the global leader in the design, manufacturing, installation, and maintenance of APH, LJUNGSTRÖM is proud to be the owner of Ljungström® Air Preheater technology.

Our history dates back to the 1920s when the first efficient air preheater was invented in Sweden by Frederick Ljungström. Today, we own all Ljungström® patents and trademarks across the world. Our group also combines the resources of industry-leading names including SRM, Air Preheater Company, Kraftanlagen, Gadelius, Stein, PBS, and APEL.

Our genuine Ljungström® Air Preheaters are recognized by boiler companies, utilities and manufacturers around the world as the best products of their type. This is why our air preheaters are more widely used than any other type of heat exchanger.


Increased Efficiency. Reduced Costs

Our air preheaters deliver impressive performance including high thermal efficiency, leakage reduction, and low-pressure drop, to enhance your operations and allow you to save significantly.


Superior Manufacturing

Our six global manufacturing facilities utilize a range of specialized equipment and processes that we continually upgrade to meet the changing needs of our customers.


Ongoing Research and Development

We invest heavily in research and development so that we can continually adapt and meet not just the current needs of our industry, but future needs too.

Round-the-clock Support

Our global team of highly experience technical service specialists and engineers are available 365 a year to help maintain the efficient and reliable operation of your Ljungström® Air Preheater.


Round-the-clock Support

Our global team of highly experience technical service specialists and engineers are available 365 a year to help maintain the efficient and reliable operation of your Ljungström® Air Preheater.



Centre or peripheral support arrangements

Sizes to meet all preheat requirements for utility-sized boilers

Bi-sector, tri-sector, and quad-sector arrangements


Comprehensive options to reduce leakage

Load following leakage control systems

Delivering unique benefits during hot and cold commissioning


Highest efficiency for lowest pressure drop

Range of profiles that provide easier cleaning and maintenance during operation

Extended life due to lower soot blowing pressures


Optimised erection sequence with a minimum number of assemblies

Alternative welded and pinned rotor options available


Robust drive configurations

Low maintenance auxiliary systems

Substantial, long-lasting and durable equipment


Our position as industry leaders is a direct result of our commitment to customer satisfaction, as well as our ongoing dedication to developing advanced technology that meets our customers’ needs

Enhancements & Upgrades

We can refurbish existing equipment, replace components, or upgrade your entire system to restore the thermal efficiency and leakage control of your operation to better than new.

Upgrade to the Ljungstrom® Air Preheater and the Ljungstrom® Gas-gas Heater to boost the performance and efficiency of your operation.

Enhance your processes with our industry preferred auxiliary systems and state-of-the-art technologies.

We offer multiple configurations, to suit your space and setup.

Hassle-free replacement of your full air preheater unit, with a unique drop-in design that attaches directly to existing support foundations.

Certified Ljungstrom® parts and components

Replacement of heating elements

Replacement of rotor components that have become worn over time

Auxiliary system parts (drive, bearings, etc)


Our technical service specialists and engineers, along with our authorized partners, will carry out world-class inspections of every element and component within your operation and provide a detailed report. Inspections can include:

Heating element basket review and recommendations

Rotating component life assessment

Condition assessment of sealing system and drive system

Shaft position and bearing inspection

Cleaning system efficiency evaluation

Assessment of operating parameter and performance

Remote Visual Inspection – Utilizing the latest aerial robotic technologies

Efficient Sealing System

Offering unique benefits during both hot and cold commissioning

Multiple ways to reduce leakage

Load-following leakage control systems

Customized Maintenance Plan

We’ll work closely with you to create a tailored maintenance plan, including recommendations for work to be carried out during planned outages. We will carry out an initial condition assessment and provide a detailed report, with recommendations that are tailored to you and your operation. This includes labour and resource planning, repairs, upgrades, replacement parts and installation services.

Emergency Services

We have a responsive team of expert technical service specialists and engineers who are the best in their fields. They are available to diagnose and repair any problems on-site, every day of the year, to help you optimize the operation and reliability of your equipment.

If you are interested in our technology and services, or would like to get in touch for any reason, we would love to hear from you.