Abstract: A method and apparatus for producing direct reduced iron from iron oxide fines. The iron oxide raw material are passed through a pre-heater having a spouted port then to a primary spouted bed circulating fluidizing bed reactor and then to a bubbling fluidizing bed reactor. The reaction of the strong reducing gas mixture, through this series of beds allows intimate contact between the fines and small particles with the reducing gas to facilitate the direct reduction of the iron oxide fines to metallized iron.

Abstract: An annular heat exchanger for incompatible fluids, such as reactive compounds, particularly for the aeronautics industry, in which a sealed bottle is fixed interior of a hollow body, with integral heat dissipators and novel fluid passageway orientation, whereby no leak can occur which would commingle the incompatible fluids.

Abstract: A junction ball for connecting two passageways in a modular playground at any desired angle utilizing two rotatably interlocking hollow half spheres having one access port each. The halves are adapted to be fitted together, rotated to produce the proper angle, and locked into place. A single half may be used for terminating a passageway in conjunction with a viewing dome. The modular half spheres are preferably molded in one piece from plastic. The spherical view port is preferably constructed from polycarbonate. These components are supported by and mounted into a standard pipe structure consisting of pipe and assorted clamps.