METHOD FOR STEPWISE COMBUSTION OF PULVERISED COAL FUEL AND APPARATUS FOR IMPLEMENTING THE METHOD Russian patent published in 2022 - IPC F23D1/00 

FIELD: power engineering.

SUBSTANCE: invention relates to power engineering and can be used in thermal power plants, boiler facilities, etc., to ensure independent ignition of the boiler from the cold state without using other highly reactive fuel, as well as to ensure high heat power of burner apparatuses. The method for stepwise combustion of a fuel-air coal mixture consists in creating an electric discharge inside the burner in the torch ignition area, supplying pulverised coal and air into the torch ignition area, the flame formation area of the torch is exposed to a diffuse electric discharge, and the fuel is combusted. The fuel combustion process is executed in steps, by dividing the pulverised coal supply into two flows: the primary flow at the first step and the secondary flow at the second step, with a possibility of independent regulation thereof, by dividing the air supply into two flows: the primary flow at the first step and the secondary flow at the second step, with a possibility of independent regulation thereof, with ignition and combustion of the primary flow of pulverised coal in the fuel mixture in the ratio of the primary air flow and the primary pulverised coal flow close to stoichiometric, followed by mixing the flue gases produced from the combustion reaction at the first step with the secondary pulverised coal flow and the secondary air flow, in conditions of a significant shortage of air oxygen at the second step, maintaining the oxygen concentration in the updated fuel mixture in the volume required only to maintain the temperature of the fuel mixture of the second step at the level of the beginning of output of volatile components and gasification of pulverised coal, followed by directing the gasified fuel mixture into the furnace for final combustion by mixing with the tertiary volume of air in the furnace.

EFFECT: invention provides a possibility of burning pulverised coal fuel with a safe level of mechanical entrainment from the cold state of the boiler without using other highly reactive fuels, as well as ensuring high heat powers of the burner when entering the working mode without the structural elements of the burner overheating.

4 cl, 2 dwg