| 摘要 |
<p>A large capacity air-powered flare (10) for smokeless combustion of very large volumes of vented waste gases, comprises a first inner vertical conduit (12) of diameter D1, for the flow of waste gas and a second larger coaxial conduit (15) of diameter D2, for the flow of primary combustion air (20), at a selected velocity in the annular space (18) therebetween. Above the top of the inner conduit (12) there is a cylindrical obstruction (34) of diameter D3 which is greater than D1 but less than D2. This forces the upwardly flowing gases to be deflected outwardly and upwardly (15) into a second annular space (25) between the obstruction (34) and the outer conduit (24). The velocity of primary conbustion air in the second annular space (25) is at least 50 f.p.s., which serves to thoroughly mix with the inflowing gases so that as they rise through the second annular space (25) they continue flowing above the top of the flare as an annular wall (44) of high velocity gas, air and flame. This high velocity annular flow (44) has large surface area on the outside and inside. Because of the high velocity of flow, secondary air (46) is induced into the outside wall (50) of this column (44) and also axially downwardly (54) into the interior (52) of this flow, where it moves radially outwardly to intersect the flowing gas and provide additional combustion air.</p> |
