COMBUSTION METHOD OF SOLID DOMESTIC WASTES Russian patent published in 2016 - IPC F23C6/04 

FIELD: power industry.

SUBSTANCE: combustion method of solid domestic wastes consists in the fact that solid domestic wastes are supplied for combustion as fuel. Fuel is supplied by a horizontal screw batcher to a horizontally oriented combustion chamber consisting of a chamber of a gasifier and a mixing chamber. Fuel feed speed is controlled by means of a frequency regulator. First, fuel is fed to the pre-heated chamber of the gasifier, to which not more than 60% of air volume required for complete fuel combustion is fed simultaneously with fuel from below through a blasting grid. Then, combustible gas obtained as a result of incomplete fuel combustion is supplied from the gasification chamber to the mixing chamber in which there mixed is the obtained combustible gas with an additional air flow supplied in the amount required for further complete combustion of combustible gas and unburned solid fuel residues. Air is supplied to the mixing chamber through air dampers by means of which air drag is controlled; the blasting grid is installed at an angle of 25° to 35° to the horizontal axis of the screw batcher at the bottom of the chamber of the gasifier. Therefore, fuel particles are forced up by air jets flowing through holes of the blasting grid, and a downward flowing fluidised fuel bed is formed. Air is supplied to the mixing chamber through blow holes made in the wall of the mixing chamber at a tangent to the circle of the mixing chamber for swirling of solid fuel particles and combustible gas, intensification of their mixing with additional air, afterburning of fuel and combustible gas. Combustion temperature of not higher than 600°C is maintained by adjustment of supply of the main and additional air flow.

EFFECT: possibility of providing low-temperature combustion of solid domestic wastes and obtainment of a gaseous thermal agent at the outlet, which is free from dioxins and furans.

1 dwg