Ljungström® Gas-gas Heaters operate in all major wet FGD processes, to enhance efficiency and elevate the overall performance of your plant.

Reduced Temperatures

The lower operating temperature of our gas-gas heaters for FGD means a reduced volume of flue gas and less water consumption, and the low pressure drop has a minimal impact on your plant heat rate. This makes your operation more efficient, reliable and cost-effective over the long-term.

Minimal Corrosion

Our GGH units reduce the corrosion of equipment and ductwork under the extreme conditions. Wear parts can be easily replaced and your system as a whole has an extended operational lifespan.

Tailored Installation

Our experience with gas-gas heater in a range of FGD processes means we can offer specific product configurations that are tailored to each plant and installation. The system is compact and adaptable, to minimize disruption to your operations during installation.


The development of the Ljungstrom® Air Preheater into a wet FGD gas-gas heater platform was first achieved by LJUNGSTRÖM engineers in 1972, and we continue to be the world leaders in the design, manufacturing, installation, and maintenance of these systems.

With over 45 years of experience, we have pioneered a proven gas-gas heater design for all wet FGD and SWFGD applications and supplied GGH systems to over 30 countries. Operating with all major FGD processes, our gas-gas heaters boast an unrivaled track record for availability and reliability


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.



Advanced heating elements

Highest quality enamel with ProTec®


Comprehensive options to reduce leakage

A tailored system to restrict the contamination of clean gas

Ensures air pollution control system meets required environmental limits


Most cleanable gas-gas heater solution, giving you maximum flexibility

Extended life due to reduced corrosion of equipment and ductwork


Compact design, with less space requirement

Multiple configurations to suit your operation


Compact, space-saving design

Minimized wear and corrosion

Low maintenance costs

Premium quality, 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.