polymer bundles


The HeatMatrix air preheater consists of multiple corrosion resistant tube bundles contained in a metal shell or housing. The proprietary polymer bundle design consists of multiple tubes that are connected to each other over almost the full length of the tube. This structure creates a strong rigid matrix grid that is able to resist high gas velocities and thermo shocks. The supporting connector between the individual tubes creates simultaneously a counter current flow configuration between the two fluids. This configuration improves the heat transfer by 20% compared to cross flow type exchangers.

The inlets and outlets of the exchanger are located at the side of the heat exchanger in order to allow easy access to the polymer tube bundles. These lightweight bundles are retractable from the top and can be cleaned or replaced without demounting the complete exchanger. In the case of fouling flue gas each bundle can be equipped with a spraying nozzle, which thoroughly cleans each bundle in an alternating cleaning sequence during operation.

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The capacity of the air preheater is fully scalable by placing multiple polymer bundles in a shell. The smaller size exchangers have a cylindrical shape and the larger size air preheaters have a boxed shape to accommodate flue gas flows up to 500,000 kg/hr.

The polymers applied for the HeatMatrix exchanger have a design temperature of 200°C. For applications with higher flue gas temperatures an integrated design between a metal and a polymer part is offered (see below).

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For flue gas temperatures above 200°C a combination between a metal and a polymer air preheater combines the best of both worlds

  • This hybrid design has the following advantages:
    Increased heat recovery over a wide temperature range
  • The polymer air preheater protects the metal air preheater against low air temperatures that lead to cold spot corrosion problems
  • The metal air preheater protects the polymer air preheater against high temperatures

Frequently used steam air preheater for raising the temperature of the combustion air to prevent local cold spots is no longer required with this hybrid air preheater design. A stacked or integrated lay-out reduces plot space and installation cost.

Please contact our engineers for more information.


If the preferred outlet for waste heat from corrosive flue gas is a liquid, a separation between the corrosive flue gas and the high-pressure liquid is recommended. Such a separation is obtained by adding a circulating air loop between the polymer gas-gas exchanger and a standard finned tube gas-liquid exchanger. This failsafe and robust design prevents any upsets in either of the independent connected systems. Compact designed skid-mounted systems are available for flue gas temperatures up to 350 °C.

This system enables also transportation of heat over longer distances and even to preheat toxic or flammable chemicals without any corrosion risks.

Please contact our engineers for more information.


The HeatMatrix polymer exchanger can also deal with fouling gas streams. The plastic tubes have a non-sticky characteristic and can be equipped with a dedicated spray nozzle per bundle, which thoroughly cleans each bundle in an alternating cleaning sequence possibly during operation.

Moreover, retractable tube bundles are accessible via the top of the heat exchanger for easy maintenance and extra cleaning if necessary.

Please contact our engineers for more information

“Worry Free Waste Heat Recovery”