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    • 5. 发明申请
    • A LIQUID SEAL FOR RECOVERING FLARED GAS
    • 用于回收瓦斯气体的液体密封
    • WO2005045173A2
    • 2005-05-19
    • PCT/IN2004/000243
    • 2004-08-11
    • OIL AND NATURAL GAS CORPORATION LIMITEDSINGH, Padam
    • SINGH, Padam
    • E21B
    • E21B41/005F16K17/192Y10T137/4516Y10T137/4643Y10T137/4651
    • The liquid seal according to the present invention consists of a U-tube having one arm connected to the pipe collecting all the gas vented from across the plant and other arm connected to a liquid holder. A pipe provided at the top of the liquid holder is connected to the gas pipe leading to the flare while there is a pipe at the bottom of the said liquid holder fitted with a non-return valve connecting to the bottom of U-tube. There is provided a drain pipe at the bottom of U-tube to drain out the liquid if needed. During normal operation all the vented gas is collected by a pipe and passed on to knock out drum (KOD). Due to the presence of a liquid seal and a piping blind between the KOD and the flare stack, the passage of gas to the flare stack is blocked. The gas passes from the KOD through a line to a recovery system and effectively all vented gas is recovered. When, due to a large increase in the volume of gas vented or an upset in the plant, the pressure on the surface of the liquid in arm (1) becomes more than a predetermined value, then the total liquid in the U-tube becomes incapable of exerting a back pressure on the gas and as a result this column of liquid gets displaced completely into the liquid holder (5) breaking the seal instantaneously. This makes the U-tube empty of the liquid; giving a free passage to the gas to escape through the U-tube to the liquid holder (5) and then through the pipe (6) to the pipe (9) and finally to the flare stack. The excess gas escapes to the flare stack. In order to prevent the release of uncombusted gas into the atmosphere, an ignition system ignites the flare burning all the escaping gas.
    • 根据本发明的液体密封件由具有一个臂的U形管组成,该U形管连接到收集从整个工厂排出的所有气体的管道和连接到液体保持器的其它臂。 设置在液体保持器的顶部的管道连接到通向火炬的气体管道,同时在所述液体保持器的底部存在配有连接到U形管的底部的止回阀的管道。 在U形管的底部设有排水管,以便在需要时排出液体。 在正常操作过程中,所有的排气都被管道收集,并通过滚筒(KOD)。 由于在KOD和火炬烟囱之间存在液体密封和管道盲孔,气体通向火炬烟囱被堵塞。 气体从KOD通过一条线路到达回收系统,并且有效地回收所有排出的气体。 当由于放气气体的大量增加或设备镦粗时,臂(1)中的液体表面的压力变得超过预定值,则U形管中的总液体变为 不能对气体施加背压,结果这一列液体完全移入液体保持器(5)中,瞬时打破密封。 这使得U型管空出液体; 给气体自由通过U形管排出到液体保持器(5),然后通过管道(6)到达管道(9),最后到达火炬堆叠。 多余的气体逸出到火炬堆。 为了防止未燃气体释放到大气中,点火系统点燃燃烧所有逸出气体的火炬。