## 3 Proposed Technical Solution  
The design of our burner is based on the existing design solutions of manufacturers of similar burners. The basic requirement is to ensure better mixing of fuel with air. Combustion of low-quality fuels requires the use of a rotary chamber, which prevents slag formation on the walls of the combustion chamber. Combustion air is most often transported into the combustion chamber together with fuel through the back wall of the combustion chamber.  
This method is also used in our proposed design. At the same time, the supplied air is divided, and part of it is led through the outer cover, which serves as an air distributor. Here, the air is not supplied statically, as in a similar burner from some manufacturers, where the air supply moves together with the combustion chamber. Our designed burner uses a planetary gear that transmits power from the electric motor to drive the fuel feeder, rotate the cylindrical combustion chamber, and rotate the air-control aperture.  
By rotating the air-control aperture, it is possible to distribute the air more evenly in the outer cover distributor, which transports it later into the burning chamber. The proposed burner is shown in Figure 2. The drive is provided by an electric motor, which is directly connected to the helical fuel feeder. On the feeder shaft is located the sun gear of the planetary gear first row, where this gear row transfers torque to the second planetary gear row. In the second row, the sun gear is connected directly to the burning chamber, which is rotating. Here the planetary gear is driving the sun gear and is also driving the ring gear, which is connected to the air-control aperture. This air-control aperture has  
Figure 1: Patent no. KR101426660 B1.  
unevenly distributed shape elements, which regulate air flow into the burning chamber. The air-control aperture is rotating against the direction of the burning chamber rotation and this rotational movement provides better mixing of burning fuel with air, which should lead to lower emissions. The mounting flange serves not only as a mounting element, but also has shape elements, which direct air flow to the burning process.  
Air flow is ensured through a separate adjustable inlet, which is connected to the fuel inlet. The air flow is divided into primary air and secondary air, with the primary air being directly fed into the fuel entering the combustion chamber. A similar method is used in patent no. KR101426660, in which air facilitates fuel injection into the combustion chamber. Originally, this method was also used in the device in patent no. FR2248747, which was intended for burning sawdust. The air-flow sketch is in Figure 3.  
Figure 3: Air flow in proposed burner (P—primary air, S—secondary air).  
Figure 2: Schematic diagram of novel rotary burner.  
The newly designed burner combines the advantages of existing devices with suitable novel features to enable the desired combustion parameters to be achieved. The secondary air is led through the burner housing via the secondary-air-controlling aperture baffle, which ensures the distribution of air into the secondary-air inlet, which is formed by openings on the cylindrical combustion chamber. The design is shown in Figure 4.  
The secondary-air-controlling baffle rotates against the direction of rotation of the combustion chamber, and by overlapping the air inlet and the controlling baffle, the flow of secondary air is directed.