FLARE STACK COMBUSTION APPARATUS AND METHOD

摘要

High-pressure air is discharged in the form of jets moving at a high velocity from nozzles mounted on a ring around the interior of the flare stack, placed at a predetermined distance from the flare tip and the portion of the surrounding stack wall downstream of the jets is perforated with air passages to admit atmospheric air. The high-velocity air movement induces a larger volume of air from the atmosphere to enter the stack where it rises to the flame zone, thereby lifting the flame and enhancing turbulent mixing of air and gas in the flame zone. Adequate stoichiometric amounts of oxygen to assure complete combustion are determined by measuring any variations of the mass flow rate of the fuel gas and/or undesired chemical and effecting a corresponding adjustment of an air flow control valve to admit a predetermined amount of pressurized air and/or atmospheric air to the flaring tip. A Coanda-effect body is positioned proximate the open end of the flare stack to improve the mixing of the air feedstream with atmospheric air and combustible components and to elevate the heat of the flame above the metal structural elements that control air flow at the top of the flare stack.