Biased degasser for fluidized bed outlet

Claim 1

A solids transport system wherein particulate solids are transferred to a conduit from the dense phase of a fluidized bed within a vessel larger than said conduit, said system comprising: an upwardly extending solids outlet conduit with an open upper end for receiving a flow of solids from said dense phase bed; a degasser means for reducing the amount of gas entrained by said solids flow into said conduit, said degasser means including a substantially vertical curvilinear wall extending upward from said upper conduit end and cut on the bias to form a solids outlet rim beveled at an angle in the range of 5° to 85° to the vertical and having a low side abutting said upper conduit end and a high side forming an extension of said upper conduit end, said curvilinear wall adjoining and extending around at least the major portion of said upper conduit end and said high side being submerged within said dense phase bed; and, inlet means for introducing particulate solids into said vessel and means for maintaining said solids in a fluidized condition without imparting substantial swirling motion to said dense phase bed such that said flow of solids into said upper conduit end consists essentially of solids transferred through said outlet rim by the fluid head of said dense phase bed, said upper conduit end being at a depth in said dense phase bed sufficient under said fluidized conditions to cause said solids to have a tendency to lose fluidization within said conduit or across said conduit end in the absence of said degasser means, the high side of said rim being spaced below said inlet means by at least one-half the depth of said dense phase bed, and the upper end of said outlet conduit being located within about one conduit diameter of the bottom of said dense phase bed.