One of the most important criteria when analysing the combustion process is the amount of oxygen in the flue gases. Too much oxygen indicates that the air supplied isn’t used in the burning process, and it just cools off the heating boiler. On the other hand, with insufficient oxygen, part of the fuel remains unburned. The unburned fuel then travels with the flue gases, and creates soot residues throughout the boiler. This way, the efficiency of the boiler is reduced, and the frequency of cleaning increases. The Lambda sensor analyses the amount of oxygen in the flue gases, and adjusts the supply of air accordingly, so that the amount of oxygen in the exiting flue gases is around 4-6%.
In order for the flame to be as concentrated as possible and so that it burns all of the fuel, our burner is supplemented by a cone burning chamber. Inside the cone, a vortex is created, ensuring the proper mixing of gases involved in the burning process. At the same time, special plates at the top end of the cone hold the small parts of the pellets inside the burner until they are fully burned out. As a result, all fuel burns inside the burner, instead of being blown out and charring in other parts of the furnace or travelling into the heat exchanger. This makes the combustion process more effective, reducing the amount of fuel needed and increasing the interval between cleaning. At the same time, the burner can handle considerably more fuel, thus increasing the heat generated, thus conserving the space and reducing the dimensions of the burner and the boiler as a whole.
During operation, it’s important that a steady air flow is maintained so that the flue gases travel through the convective zone and heat is absorbed into the heating system. But when no pellets are being burned, the air flow would do the opposite – cold air that hasn’t been heated during burning would cool off the heat exchanger. Our pellet boilers are equipped with a natural draft check vale, which prohibit the air supply into the boiler when there is no burning. This way, the air flow is interrupted, and the heat stored in the boiler is preserved to be used later.
Our heating boilers can operate automatically for a week and even more, as long as there are pellets in the container. In case the container goes empty, a special pellet level sensor in sends a signal to stop the burning process. The supply of pellets and air is halted, saving electricity, and the natural draft check valve seals the boiler to preserve heat. This way You don’t have to worry if You’ve forgot to add pellets to the container – the operation of the boiler is halted until more fuel is supplied.