Benefits of infrasound as acoustic soot cleaning method

December 1, 2020 /

Infrasound cleaning illustration

The first installation of an Infrafone Sonic Soot Cleaner with the purpose to keep an industrial boiler clean from soot was carried out in 1978. The boiler was an MgO boiler in a paper mill at Stora Enso in Hyltebruk, Sweden. The success of that installation taught us about the power of infrasound. The experience that we have obtained over the years has taught us how to create value with infrasound.

The properties of sound differ substantially depending on the frequency range. Sound can be divided into infrasound, audible sound, and ultrasound. Infrafone harnesses the power of infrasound, which is sound with frequencies below 30 Hz.
Infrasound waves have many properties that make them suitable for soot cleaning applications:

Infrasound waves have a long wavelength. The acoustic power can reach areas far away from the acoustic source, unlike conventional soot cleaning methods.

Infrasound waves are Omni-directional. This means that they spread in all directions with the same intensity, which implies installation flexibility. The Sonic Soot Cleaner does not necessarily need to be installed in the area to be cleaned.

Infrasound waves have low absorption. Consequently, very little energy is lost. The energy is instead transmitted to the flue gas flow, preventing soot accumulation.

The Infrafone soot cleaning method is based on infrasound which causes oscillations within the flue gas flow. The turbulence created by the oscillations prevents the accumulation of soot deposits on heat exchange surfaces.

Infrasound cleaning as a tailor-made method

Generating infrasound is however not enough in order to obtain the desired cleaning effect. The success of our infrasound cleaning system lies in the unique knowledge gathered during more than 30 years of experience. Our continuous development has ultimately led to unique acoustic modeling software that simulates the behavior of infrasound waves in the customer’s application. Taking into account the dimensions and operational parameters of the boiler or the exhaust gas duct, the acoustic modeling software calculates the optimal installation location and parameter settings of each Infrafone Sonic Cleaner in order to get the desired cleaning effect. Therefore every Sonic Cleaner is tailor-made for each specific application and every customer’s individual needs.

The optimal installation location is not always straightforward to determine. For successful results, it is, therefore, crucial to have the knowledge and capability to calculate where each Sonic Cleaner needs to be located, what size of Sonic Soot Cleaner is necessary, and which operating frequency it should have. The figures on the right show two Infrafone Sonic Soot Cleaning installations on an industrial and a marine boiler. Although the installation locations seem odd they are optimal from an acoustic point of view for the desired cleaning area. Each sonic cleaner operates on a different frequency that is optimal for each cleaning area.

Latest news & articles

Now ISO45001 certified

Heat Manage is now ISO 45001 certified. It is a global standard for Occupational Health and Safety Management Systems that provides a practical solution to improve the safety and health of both employees and other personnel.

Is your pulp mill’s power going to waste?

It is possible to significantly optimize the operations of recovery boilers in pulp mills simply by cleaning the soot off heat transfer surfaces in a more efficient way. We know, we’ve done the research. Here is what we discovered from our study of recovery boilers in Sweden.

Meet Ola Nordin, our newest Sales Manager

A couple of weeks ago we started off 2021 by introducing Adam Backman, our newly appointed Inside Sales Engineer. Now it’s time to introduce another new colleague: Ola Nordin.

Benefits of infrasound as acoustic soot cleaning method

December 1, 2020 /

Infrasound cleaning illustration

The first installation of an Infrafone Sonic Soot Cleaner with the purpose to keep an industrial boiler clean from soot was carried out in 1978. The boiler was an MgO boiler in a paper mill at Stora Enso in Hyltebruk, Sweden. The success of that installation taught us about the power of infrasound. The experience that we have obtained over the years has taught us how to create value with infrasound.

The properties of sound differ substantially depending on the frequency range. Sound can be divided into infrasound, audible sound, and ultrasound. Infrafone harnesses the power of infrasound, which is sound with frequencies below 30 Hz.
Infrasound waves have many properties that make them suitable for soot cleaning applications:

Infrasound waves have a long wavelength. The acoustic power can reach areas far away from the acoustic source, unlike conventional soot cleaning methods.

Infrasound waves are Omni-directional. This means that they spread in all directions with the same intensity, which implies installation flexibility. The Sonic Soot Cleaner does not necessarily need to be installed in the area to be cleaned.

Infrasound waves have low absorption. Consequently, very little energy is lost. The energy is instead transmitted to the flue gas flow, preventing soot accumulation.

The Infrafone soot cleaning method is based on infrasound which causes oscillations within the flue gas flow. The turbulence created by the oscillations prevents the accumulation of soot deposits on heat exchange surfaces.

Infrasound cleaning as a tailor-made method

Generating infrasound is however not enough in order to obtain the desired cleaning effect. The success of our infrasound cleaning system lies in the unique knowledge gathered during more than 30 years of experience. Our continuous development has ultimately led to unique acoustic modeling software that simulates the behavior of infrasound waves in the customer’s application. Taking into account the dimensions and operational parameters of the boiler or the exhaust gas duct, the acoustic modeling software calculates the optimal installation location and parameter settings of each Infrafone Sonic Cleaner in order to get the desired cleaning effect. Therefore every Sonic Cleaner is tailor-made for each specific application and every customer’s individual needs.

The optimal installation location is not always straightforward to determine. For successful results, it is, therefore, crucial to have the knowledge and capability to calculate where each Sonic Cleaner needs to be located, what size of Sonic Soot Cleaner is necessary, and which operating frequency it should have. The figures on the right show two Infrafone Sonic Soot Cleaning installations on an industrial and a marine boiler. Although the installation locations seem odd they are optimal from an acoustic point of view for the desired cleaning area. Each sonic cleaner operates on a different frequency that is optimal for each cleaning area.

Latest news & articles

Now ISO45001 certified

Heat Manage is now ISO 45001 certified. It is a global standard for Occupational Health and Safety Management Systems that provides a practical solution to improve the safety and health of both employees and other personnel.

Is your pulp mill’s power going to waste?

It is possible to significantly optimize the operations of recovery boilers in pulp mills simply by cleaning the soot off heat transfer surfaces in a more efficient way. We know, we’ve done the research. Here is what we discovered from our study of recovery boilers in Sweden.

Meet Ola Nordin, our newest Sales Manager

A couple of weeks ago we started off 2021 by introducing Adam Backman, our newly appointed Inside Sales Engineer. Now it’s time to introduce another new colleague: Ola Nordin.

Go to Top