'AN AUGMENTED WATER COOLED FLAT PLATE DISTRIBUTOR AND SUPPORT DEVICE FOR AIR/GAS/STEAM DISTRIBUTION IN HIGH PRESSURE FLUIDIZED BED GASIFICATION SYSTEMS'

摘要

The invention relates to an augmented water cooled flat plate distributor and support device for air / gas / steam distribution in high pressure fluidized bed gasification systems, the system comprising a cylindrical shaped pressurized fluidized bed gasifier (12) to produce syngas from various grades of coal, a fluidizing bed chamber (13) to accommodate the static and fluidized bed, encompassed by a refractory brick lining (14) including an insulating brick lining (15) to withstand high temperature and high pressure fluidized bed, a non- fluidized bed material (16) uniformly spreadover the bed; the device comprising a plurality of shaped distributor plates (19) having multiple first holes (20) drilled with a diameter and pitch in which the plurality of stubs (25) are inserted and firmly fixed by a number of welds (26), a plurality of first slotted bolt-holes (21) drilled at the periphery, a second hole (22) drilled at the center of distributor plate for bed ash extraction, the second hole (22) having a diameter larger than the first hole (20); a castable refractory lining (17) including an insulite lining (18) disposed over the plurality of flat distributor plates (19) to act as a thermal insulator and protect the distributor plates (19) from high temperature; a plurality of bubble caps (23) having a plurality of fluidizing nozzles (24) constructed at the top periphery of the caps (23), through which the feed air or a mixture of air and steam is uniformly distributed at an optimum velocity for fluidizing the material in the fluidizing bed chamber (13) and minimize formation of agglomerates due to rapid and thorough mixing of the bed including easy extraction of bed ash; a support ring plate (30), having a plurality of second slotted bolt-holes (31) drilled to match with the first slotted bolt-holes (21) and accommodate thermal expansion of the distributor plates (19) during gasifier operation; a plurality of gusset plates (32) welded at the bottom of the support ring plate (30) to form a support assembly, and placed below the fluidizing bed chamber (13) and welded into the gasifier (12) to firmly hold and support the distributor including the entire bed without sagging or deflection of the distributor during gasifier operation; a plurality of stiffener plates (38) having contours matching with that the cooling water pipes (27) of a cooling water flow circuit welded at the bottom of the distributor plate to act as an additional support for preventing sagging or deflection of the distributor array at various loads of gasification.