Solid fuel
FOCUS boilers

The FOCUS solid fuel boiler is designed taking into account the operation of a pellet burner, for the installation of which in the FOCUS heating equipment there is a door adapter. The design of the firebox assumes the presence of two doors, which implies its use as a classic solid fuel wood-burning boiler, with the ability to work on wood, briquettes, coal and pellets.

Thus, the combustion chamber of the FOCUS boiler is adapted for burning wood (any solid fuel) and pellets. The combustion process and automatic fuel supply during the operation of the pellet burner are controlled by the PLUM microcontroller, which allows connecting up to 10 sensors. When installing a pellet burner in a FOCUS solid fuel boiler and supplying pellets from a pellet hopper, the buyer receives a pellet boiler at a lower price with the efficiency of heating equipment 95%.

The main combustion product is "bulk" hot air. In addition to efficient combustion of fuel, the boiler must provide heat convection of a large volume of hot air. For these purposes, the heating equipment is equipped with a developed heat exchanger built into the structure of the furnace.

Many solid fuel boilers use cast iron heat exchangers. Heating the metal with a high heat capacity improves the efficiency. Steel heat exchangers also provide good convection, especially in cases of special design solutions.

Solid fuel boiler FOCUS has a combined heat exchanger. Originally lamellar, also used as an ash filter. The main convection of hot air is provided by a horizontal fire tube heat exchanger, as the most efficient and often used in industrial and pellet boilers. The design of the heat exchanger means that the movement of gases from the burners is fast enough for efficient heat exchange.

Complete combustion of pyrolysis gases released during heating of solid fuels reduces the amount of ash emitted and the level of pollution of heating equipment during operation.

For combustion of high-ash fuel, as well as problematic grades of coal (DG grade) and lignin biogranules with an ash content of 15-17% in FOCUS solid fuel boilers, a classical approach was applied. The air supplied to the combustion chamber is divided into primary and secondary. Primary air is supplied under the grate to ensure the smoldering of the fuel. The secondary is fed over the fuel for afterburning pyrolysis gases and minimizing smoke (underburning of gases).

The ecoMAX860P TOUCH sensor automation regulates the air supply to the pellet burner and the solid fuel boiler separately, taking into account the different operating modes of the equipment. This approach implies a wide range of automatic settings.

To all solid fuel boilers FOCUS design changes can be made during production according to the customer's specifications... Can also be installed turbulators provided that wood pellets are used during operation.