METHOD FOR THE IGNITION AND FLARE COMBUSTION OF AN AIR-FUEL MIXTURE AND APPARATUS FOR THE IMPLEMENTATION OF THE METHOD Russian patent published in 2022 - IPC F23D1/00 

FIELD: power engineering.

SUBSTANCE: invention relates to power engineering and can be used at thermal power plants, in boiler rooms, etc. to ensure ignition and stabilise the burning of pulverised coal fuel. Method for flare combustion of a fuel-air coal mixture consists generating an electric discharge by alternating current on rod electrodes entered into the booster stage. Pulverised fuel is then supplied to the booster stage. The air-fuel mixture is ignited due to the effect of the electric discharge and heats the walls of the booster stage. Then the booster stage gains the calculated heat output and heats the larger working stages. The size of the booster stage is determined on the basis of the heat engineering composition of the supplied fuel, the flare heat output required to launch the working stage, the optimal air excess coefficient, and the discharge rate of the flare. After heating, the working stage is supplied with fuel. The working stage has a muffled body, and a fuel and air supply channel, wherein the air supply channel is equipped with electrode electric discharge generation units. The size of the working stages and the amount of fuel and air supplied thereto are growing consistently. The number of working stages is determined on the basis of the heat engineering composition of the supplied fuel and the required heat output of the burner apparatus. When passing through the working stage, the air-fuel mixture is exposed to the following factors of ignition initiation and fire maintenance: thermal activation due to the heat release of the flare exiting the booster stage, as well as the heat release from the heated walls of the working stage; chemical activation due to the chemical reactions with the heated combustion products of the flare exiting the booster stage; and electrical activation due to the generation of an electric discharge on rod electrodes entered into the air supply channel of the working stage. After the first working stage goes into design conditions, the second working stage is activated. The operating mode and structure of the second working stage and the subsequent working stages are similar to those of the first working stage, not including the size and the amount of supplied fuel and air. After the self-ignition temperature of the fuel-air mixture is reached in the burner apparatus, the supply of fuel and the electrical impact on the booster stage and the preceding working stages can be stopped. The operating mode of the burner becomes autonomous and self-maintained. Depending on the operating mode of the burner apparatus, the number of electrode units in operation and the characteristics of electric discharge can be adjusted by the power source. If the quality of fuel decreases or the load of the boiler is reduced, the supply of fuel and electric discharge to the booster stage and the preceding working stages can be used to maintain the quality of burning of the fuel flare. The position of the flare in the burner apparatus, the length of exit of the flare from the stages and into the furnace space, the discharge rate of the flare from the burner apparatus, and the degree of chemical underburning by the stages and in the burner apparatus as a whole can be controlled by adjusting the supply of air, fuel, and electric discharge in the stages of the burner apparatus.

EFFECT: invention provides a possibility of igniting fuel with minimal entrainment of non-ignited particles into the furnace, ensures optimal quality of ignition and maintenance of burning of the flare in various operating modes of the boiler equipment.

10 cl, 1 dwg