Combustion of wood in a fireplace

Primary and secondary air: clean combustion explained

Clean burning is a process of burning fuels without emitting smoke. It is achieved by injecting primary and secondary air into the firebox of the wood stove. The primary air is used to regulate combustion, while the secondary air reduces smoke emissions.

Primary and secondary air: what are the differences?

Clean combustion is a process that produces few or no air pollutants. It is achieved by controlling the air/fuel ratio and providing sufficient air for combustion.

Controlling the air/fuel interaction limits emissions of nitrogen dioxide (NO2), nitrogen oxides (NOx) and other greenhouse gases. carbon monoxide (CO) and fine particles. By providing sufficient air for combustion, emissions of volatile organic compounds (VOCs) and sulphur dioxide (SO2) are reduced.

This form of combustion can be achieved in various ways, including the use of primary and secondary air:

  • Primary air is the air that enters the combustion system. It is easier to regulate and control.
  • Secondary air is air that is added to the combustion system after it has been preheated. It reduces CO2 emissions and energy consumption.

What is at stake in clean combustion?

SUPRAheating | To better understand the 3 phases of wood combustion!

Clean combustion is a process that uses clean fuels to produce energy. This method of energy production is cleaner than traditional approaches because it generates less air pollution. It is also more efficient, which means that less fuel is needed to produce the same amount of energy.

It allows a better use of fuel and a reduction of air pollutant emissions. This form of combustion generates less carbon monoxide (CO), nitrogen oxide (NOx) and fine particles than conventional combustion techniques. It therefore helps to improve air quality and reduce the adverse effects on human health and the environment.

As well as being used in your wood stove, clean burning technology is also used in many industries, including energy, transport and power generation. It is also used in some types of vehicles, particularly electric and hybrid vehicles. This is why this form of combustion is now an important issue in the fight against greenhouse gases and the energy transition.

Is your wood stove not powerful enough? Do you want to change it?

>> Discover our complete guide to the best wood stoves

Clean burning: how does it work?

Clean burning is a relatively new technology that is beginning to be adopted on a large scale and beyond the simple wood stove. It is often used in power stations and heat production plants, as it reduces emissions of gases including carbon dioxide (CO2), carbon monoxide (CO) and fine particles. There are two types of clean combustion:

  • Primary combustion It uses only air and produces few harmful compounds. It uses a mixture of air and clean fuel, called primary air, to feed a combustion chamber (the firebox of your wood stove). The mixture is injected into the chamber at a controlled pressure and temperature, allowing the fuel to burn completely.
  • Secondary combustion It uses a combination of air and fuel, which further reduces the emission of toxic compounds.

In chemistry, combustion is an exothermic (heat-generating) process between a fuel and an oxidant that results in the production of gases and a rise in temperature. Clean combustion is a type of combustion that produces little or no pollutants. It has many advantages: in addition to limiting the emission of harmful compounds, it reduces energy consumption and the noise generated by the combustion process.

Woman sitting in the living room in front of the fireplace of her wood stove