How does double combustion work in a fireplace?

How does double combustion work in a fireplace?

Although it seems that chimneys haven’t changed over time, the reality is quite different. Today, the models of chimneys and stoves that can be found are more efficient and operate by consuming less fuel than a few decades ago. Especially those that implement innovative systems, such as double combustion. Let’s see how these chimneys work.

First combustion

The first phase of combustion in a chimney is the burning of the fuel, usually coal or firewood. It is what we could consider “normal” combustion, which emits residues in the form of particles and gases. If no additional action is taken, these residues are expelled through the chimney flue.

That’s how stoves and chimneys used to work in the past. Some very basic models, especially those built-in, still maintain this form of combustion, although it is considered less efficient and produces more pollution.

Process of burning residues to make use of them

The residues generated by the first combustion are combustible, so they can be used to improve performance. For this purpose, the double combustion system injects a little preheated air, which causes the burning of the gases and particles. The result is more heat, less fuel consumed, and less pollution, as the more that is burned, the less smoke is expelled through the chimney. In the best-utilized cases, the only thing that should come out is water vapor, although it must be acknowledged that achieving that extreme is very difficult.

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double combustion in a chimney

Advantages of this system over the traditional one

The benefits of multiple combustion systems, both this one and the triple combustion, are evident. If you have a fireplace that consumes waste, you will need less fuel to reach the comfort temperature, which translates into significant money savings.

double combustion in a chimney

In addition, the environment will benefit from this combustion system. As mentioned before, the waste is burned, resulting in reduced pollution emitted into the atmosphere. The result is cleaner air and fewer respiratory problems.

Another advantage is related to the condition of the walls and the elements inside the chimney. By reducing the expelled elements, the interior of the pipes remains cleaner, which reduces the need for cleaning and maintenance. However, keep in mind that they are only reduced, so you will need to inspect the installation and perform a thorough cleaning when necessary. Although you will notice the difference in both time and performance of your fireplace.

Modern technology at your service

Although it may seem simple, these double combustion fireplaces are an example of what can be achieved in terms of energy efficiency. By installing a quality door, you optimize performance, and with the entry of air at the right temperature, you further increase the efficiency of your stove. And the best part is that you can even do it with your travel fireplaces because it’s very easy to upgrade.

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