| 摘要 |
<p>Stirring gas is fed, via a rotary joint, into a single passage through the trunnion of an oxygen steel converter. A distribution channel continues in a semi-circular belt around the converter. From this channel individual feed passages lead to each of a number of injection units in the base of the converter, e.g. porous bricks set in the lining. Each channel includes, in order, a shut-off valve, a sonic orifice, a preloaded exhaust valve, and a pressure gauge. The final flexible connection to the porous brick, by a convoluted steel tube, accommodates thermal movement of the converter lining. A single passage, fed through a rotary joint, is more satisfactory mechanically than a number of small diameter passages fed by individual flexible connections. The calibrated sonic orifices balance the gas flow to each inection unit, regardless of the total flow. In the event of one unit becoming blocked pressure build-up, due to flow restriction, is released, preventing damage to the porous brick. The preloaded valve however retains enough pressure to restart flow of the blockage is released.</p> |
