METHOD FOR BURNING FLAMMABLE GASES IN AN ARC FURNACE

摘要

1. A method for afterburning combustible gases in an arc furnace, including feeding a swirling oxygen flow into the working space of an arc furnace, afterburning combustible gases formed above the slag, supplying the bath of released thermal energy from the afterburning of combustible gases and sucking off the flow of exhaust gases through the branch pipe of the arc furnace, which is characterized by that the swirling flow of oxygen is fed against the flow of combustible gases sucked towards the branch pipe of the arc furnace, and the afterburning of these combustible gases is carried out in the working space of the furnace in the volume of the swirling flow of oxygen between the inlet to the branch pipe, the roof and the walls of the furnace and slag, and during the afterburning of combustible gases in the volume of the swirling oxygen flow, an afterburning torch is formed, directed at an angle of 30-60 ° to the surface of the furnace bath. 2. The method according to claim 1, characterized in that the supply of the swirling flow of oxygen is carried out using a lance, which is placed along the axis of the arc furnace branch pipe, and the axis of the lance is located on the axis of the branch pipe located in the arch of the arc furnace. The method according to claim 1, characterized in that the intensity of the afterburning of combustible gases in the working space of the arc furnace behind the branch pipe is controlled using an automatic gas analyzer, or the intensity of the afterburning of combustible gases is monitored according to the measurement of the oxygen content in the exhaust gases behind the branch pipe using an electrochemical sensor. The method according to claim 1, characterized in that the flow rate of the swirling flow of oxygen is changed during the operation of the arc furnace, depending on the content of CO and H in the composition of gases leaving the furnace branch pipe. The method according to claim 1, characterized in that a sample of exhaust gases is taken behind the branch pipe