Less emissions for a
future-proof industry

Do you want less emissions coming from your industrial production process? Then start with the heat and air technologies that keep it running. That way, you accelerate the industrial energy transition while making your energy use and energy costs more efficient.

The Callens Group makes the heat and air technologies you rely on more sustainable, helping you meet stringent greenhouse gas and flue gas emission standards. From technical solutions for CO2 and NOX reduction to transparent communication through a sustainability report: we work sustainably and communicate openly about it.

Discuss your sustainability challenge

Why sustainability is high on the agenda

Rising energy costs

Energy efficiency and heat recovery are key sustainability measures to keep operating costs under control.

Stricter emission standards

CO2 and NOX emissions are subject to increasingly strict regulations. Companies must prepare their installations for future standards and permitting requirements.

Climate goals

To achieve ambitious climate goals at both national and international level, industry needs innovative technology.

Energierecuperatie WT
Solutions

Our sustainability solutions

The transition to a more sustainable industry is happening on several fronts at once. Keep your CO2 and NOx emissions under control with the most effective technologies.

Industrial CO2 reduction

The transition to a low-carbon industry requires a well-considered approach. The Callens Group helps companies structurally reduce their CO₂ emissions with technically feasible solutions that contribute to Europe’s climate objectives for 2050. We focus on both quick energy gains and a future-oriented decarbonization strategy.

 

Our expertise:
  • Electrification of production processes
  • Valorization of residual streams
  • Combined heat and power (CHP)
  • Energy recovery for thermal technology
  • Energy recovery for air technology

 

More about industrial CO2 reduction

NOX reduction

Increasingly stringent emission standards call for carefully considered solutions to flue gas treatment and combustion technology. The Callens Group analyzes your installation and selects the most suitable technology to sustainably limit NOx emissions.

 

Our expertise:
  • Internal and external flue gas recirculation
  • SCR (Selective Catalytic Reduction)
  • SNCR (Selective Non-Catalytic Reduction)
  • Tailored boiler design

 

More about NOX reduction

Building sustainable growth?
We energize your ambitions.

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Why choose the Callens Group’s sustainability solutions?

The transition to a more sustainable industry requires a partner who understands your production process, sets the right priorities, and translates sustainable solutions into concrete technologies. Thanks to our knowledge of industrial processes and related emission challenges, the Callens Group’s engineers develop targeted solutions.

From ambition to execution

We translate sustainability objectives into technically feasible solutions that prove their value from day one.

Strategy and engineering under one roof

Our specialists combine in-depth process knowledge with expertise in CO2 reduction and NOX reduction to build the best integrations.

Custom engineered

No one-size-fits-all solutions, but technologies tailored to your installations, energy use, and business objectives.

Measurable impact on energy and emissions

Our solutions help reduce CO₂ emissions and NOx emissions while improving energy efficiency.

Meet regulatory requirements

With our solutions, you can easily comply with current and future regulations.

Long-term optimization partner

Even after implementation, we continue to monitor your installation and help ensure that as little energy as possible is lost.

Our workflow

From analysis to intervention

01 /5

Analysis

We map your current energy consumption, emissions, and sustainability challenges.

02 /5

Setting priorities

Together, we identify the measures with the greatest technical, environmental, and economic impact.

03 /5

Road map

We develop a concrete step-by-step plan, including a business case and investment priorities.

04 /5

Engineering and implementation

Our engineers translate the chosen solutions into a technically feasible project and guide the entire implementation.

05 /5

Monitoring and optimization

After delivery, we track your installation’s performance and adjust where needed to achieve the objectives set out in advance.

Ready to achieve your sustainability objectives?

Do you want to reduce your production process’s CO2 emissions, meet stricter emission standards, or build a credible sustainability strategy? Our specialists will gladly explore which approach best suits your organization.

Contact us

Sustainability projects

Callens Warmtepomp 3
Thermal technology Industrial heat pumps Electrification +1

Industrial heat pumps reduce CO₂ emissions

Capacity4.2 MW
Energy source100% electricity
Cargill Haubourdin E boiler 20 MW 30 T ZW
Thermal technology Electrification Electrode boilers +2

Combination of e-boiler and gas boiler modernizes starch factory

Capacitye-boiler: 20 MW 
gas boiler: 20 MW
Working pressure35 barg

Questions?
We have the answers.

There are several technologies to reduce nitrogen oxide (NOX) emissions. The most suitable solution will depend on factors such as the combustion process, target emission values, the existing installation, and the available space. The Callens Group analyzes these parameters and selects the technology, or combination of technologies, that offers the greatest technical and economic added value.

Want to know which technology best suits your installation? Discuss your NOX challenge with our specialists.

Both SCR (Selective Catalytic Reduction) and SNCR (Selective Non-Catalytic Reduction) reduce NOX emissions through a chemical reduction process. The difference lies in the application. SCR uses a catalyst and achieves very low emission values, while SNCR works without a catalyst and can be a technically and economically attractive solution to certain applications. The most suitable technology will depend on the installation, process conditions, and required emission reduction.

Flue gas recirculation is particularly suitable when NOX formation needs to be limited during the combustion process itself. By returning part of the flue gases to the combustion chamber, the flame temperature drops and the formation of thermal NOX is reduced. Depending on the installation, internal or external flue gas recirculation may be an option, potentially in combination with other NOX reduction technologies.

Discuss the possibilities for your installation with our experts.

In many cases, existing combustion installations can be optimized without full replacement. Depending on the technical possibilities, the solution may involve an adapted boiler design, flue gas recirculation, SCR, SNCR, or a combination of different technologies. The Callens Group assesses which solution best suits the existing installation and the desired emission targets.

Contact our specialists for an analysis of your installation.

The choice of NOX reduction technology will depend on several factors, including flue gas temperature, fuel type, the combustion installation, required emission limit values, and available space. That is why the Callens Group first performs a thorough analysis of the complete combustion process. Based on that analysis, we develop a solution that optimally combines emission reduction, energy efficiency, and operational reliability.

Several technologies can be used to decarbonize industrial processes. The best-fit solution depends on your installations, energy consumption, and business objectives. The Callens Group combines technologies such as electrification, combined heat and power systems, energy recovery, and valorization of residual streams into one integrated solution.

A successful decarbonization strategy starts with an analysis of the entire production process. Based on that analysis, our specialists determine which combination of technologies will have the greatest impact on CO2 emissions, energy consumption, and business performance. This way, you invest first in the solutions that are both technically feasible and economically sound.
Curious about the CO2 reduction opportunities for your company? Our experts will be happy to think along with you.

Not necessarily. Electrification is an interesting technology for many applications, but it is not suitable for every production process. Depending on your situation, combined heat and power, energy recovery, or valorization of residual streams may offer a better solution. That is why the Callens Group always takes a technology-independent approach. Talk to our experts about it.

That depends on several factors, such as energy consumption, the chosen technology, investment cost, energy prices, and any available subsidies. That is why we develop a technical and economic business case for every project, so that you can make a well-founded investment decision.

National and European support measures are available for several decarbonization technologies. Which subsidies apply will depend on your project and the selected technology. During the analysis, our specialists assess which opportunities may be relevant to your investment.

To meet the 2030 and 2050 European climate targets, it is important to take action now. Transitioning takes time, especially if you want to invest in a targeted way and also expect a return. Start now with a CO2 roadmap to compare your options with your needs, so you know which direction to take, and which phased investments to make.

That will depend on the condition of your boiler room and on the sustainability path you still need to complete. Sometimes, small interventions are enough to lower your CO2 emissions, but we also need to assess whether they will be sufficient in the future. In other cases, a new boiler room will deliver a better return, both economically and environmentally.
Contact our experts for a thorough analysis of your boiler room.

Building sustainable growth?
We energize your ambitions.

Let's talk