Heating system for fluidized bed gas generator

Claim 1

In a gas generator, using a fluidized bed of steam and coal generated and maintained in a horizontally positioned stationary cylinder, having an axis and a jacket, a heating system, comprising: a first and a second single-piece, long, hollow box, each being internally cooled and thermally insulated over its outer surface, said boxes having a horizontal disposition in and transversely to the axis of the cylinder, and being spaced from each other in a direction transverse to their axes; a first and a second plurality of heating tubes respectively suspended from the first and second boxes for downward extension, but not communicating with the hollow interior thereof; a plurality of manifold tubes supported on the boxes, each manifold tube lying on both boxes, said manifold tubes being connected to the heating tubes, in that each heating tube is connected to two of the manifold tubes for respectively feeding and discharging heating fluid; heating fluid feed and discharge duct means inside the cylinder and connected to the manifold tubes to respectively feed to some of them heating fluid and to receive heating fluid from others; and suspension means for suspending each of the boxes from above and bearing against the outer jacket of the cylinder and including thermal-expansion-compensating means.