Multi-cyclone for solid biomass boilers

for emissions in compliance with UNI 303/5

Solid biomass boilers emissions

Customer companies design and produce boilers that burn solid biomass, pellets and wood chips for all kinds of buildings, with powers that range from tens of kW to over 1000 kW of heat.

They therefore offer heating solutions using carbon neutral fuels such as woodpellets or wood chips that ensure high performance for heating any kind of environment.

UNI 303/5

Combustion is a complex phenomenon. The output of this violent reaction is, in the first instance heat and, at the same time, a number of by-products and waste products, which in many cases may be harmful to humans and the surrounding environment.

For these reasons, the consumer and civil segments (which for simplicity we can associate with powers of less than 1 MW), has been influenced by the thermal accounting mechanism (2013) that, in relation to biomass, encourages small interventions (powers of less than 1 MW of heat) for producing thermal energy from renewable sources and high efficiency systems (art. 4, paragraph 2 of the decree).

For biomass boilers, the calculation is based on the product of 4 factors:

Turbovortex for biomass boilers
  • Valorisation factor;
  • Thermal power of the plant;
  • Estimated operating hours;
  • Dust emission reward coefficient (for pellet and wood burning stoves, and fireplaces, the equations is slightly more complex).

Regarding the first two arguments, the manufacturer itself has addressed the problem, resolving it with appropriate changes to the boiler’s design and engineering.

As you can see, point 4 is strongly influenced by the chosen emission treatment system. For this choice there are two regimes:

  • For plants with powers <500kW: the generator must be certified on the test according to class V limits (EN 303-5:2012);
  • For plants with powers > 500kW > 1MW: the emissions must be certified according to class V limits (EN 303-5:2012), to be performed on site by an accredited body.

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For this reason this customer requested Tecnosida® to develop a dust treatment and suppression system that would bring their products within the above mentioned limits.

Treatment of solid biomass combustion fumes

Tecnosida® accepted the request and offered to develop a project in partnership with the customer, in order to design and produce a dedicated solution for the boiler that the customer intended to certify.

The main project phases were:

The main project phases were:

  • Assessment of the technical situation and initial analytical verification;
  • Presentation of an overview of suitable solutions with budgetary quote;
  • Selection and adaptation of the solution together with the customer;
  • Physical testing of the solution with the generator to be certified;
  • Final tuning;
  • Certification of the generator together with the Tecnosida® scrubber at the accredited third-party body.

The partnership was successful and the generator (400 kW of heat) was certified class V thanks to the use of TURBOVORTEX® technology. As a consequence of the objective verifications carried out, the company has been able to present the documentation required for class 5 approval of their boilers.

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