| 摘要 |
<p>Gas with entrained particles, such as high temperature and pressure gas from a pressurized circulating fluidized bed reactor, is filtered using a vessel having a gas inlet (4), cleaned gas outlet (5), and filtered particles outlet (13). A pulse of cleaning gas is periodically or intermittently directed to the filters (9) to dislodge the particles which have been filtered and collected on the filters (9). Shrouds (10), having tubular, parallelepiped, zig-zag, or honeycomb configurations, are provided surrounding relevant portions of the filters to prevent dislodged particles from being entrained in gas passing to other filters, and instead directing the dislodged particles toward the vessel particles outlet. The shroud walls may have openings in them to allow gas to be filtered to pass through them, but prevent dislodged particles from passing through the openings. The filters (9) may be mounted in hollow tubular or parallelepiped ducts (12) in such a way that the ducts have smooth outer walls, and the shrouds (10) may be substantially concentric with the ducts. When individual cleaning gas pulsing devices are associated with filters, the shrouds may include separate impingement and material collecting portions.</p> |
