• Gas Cleaning Technology for the Lowest Emissions


HoSt’s flue gas cleaning technology is applied for the lowest emissions and to meet the most stringent emission requirements. HoSt is a forerunner and industry leader in this field and has developed the cleanest NO-NOx technology, resulting in the cleanest plant by minimizing NOx, Sox (sulfuroxides), HCl (hydrochloric acid), dust and other pollutants to meet required emission standards anywhere. Our proven gas cleaning techniques, continuous innovation and strict emission standards limit the emissions from firing biomass to a minimum.

Very low emissions can be realised with the HoSt flue gas cleaning system. By default, HoSt includes a multicyclone and bag house filter to reduce the dust emissions. Extreme low NOx emissions can be realised by the combination of combustion control, urea injection, and the DeNOx catalyst: the well-known NO-NOx technology, in-house developed by HoSt and successfully applied in current projects. The concentration of sulphur and chlorine components in the flue gas can be reduced by installing additive injection. The NO-NOx flue gas cleaning technology is a best available technology and results in the lowest measured emissions of biomass-fired heat and power plants ever measured in the Netherlands.

Our proven gas cleaning techniques and continuous innovation limit the emissions from firing biomass to a minimum. Extensive and advanced flue gas cleaning ensure that our modern biowaste-fired energy installations emit very few contaminants. Thanks to the bag house filter, which ensures filtering dust separation, and extensive flue gas cleaning technology, such as a DeNOx catalyst and urea injection into the furnace, our biomass-fired plants have guaranteed low dust emissions and nitrogen oxide emissions.

In accordance with local regulations

All systems are in the first stage equipped with a multi-cyclone filter to remove dust, an important part of the flue gas cleaning technology. In the second stage the dust emission is further reduced. Depending on the type of fuel and the local emission requirements, the second cleaning stage could contain an electrostatic filter, bag house filter, or flue gas condenser.

Chemical contaminations

An absorbent-injection is applied where chloride, sulphur or other chemical contaminations need to be removed. An absorbent-injection is always equipped in combination with a bag house filter. The absorbent, bicarbonate, or lime is selected based on the desired cleaning temperatures and concentrations of the chemicals. Activated carbon can also be dosed if required.

Low NOx emissions

A special combustion technique is applied in a HoSt installation that keeps NOx emissions relatively low. In addition, multiple HoSt NOx reduction technologies (SNCR & SCR) can be applied to further decrease the NOx emission to the environment.


Interested in what we can offer? Or interested in visiting one of our projects? Don’t hesitate to contact us. We would be glad to assist you and help you in making the best choice.

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