Apparatus for mixing a fluid feedstock with particles

An apparatus for mixing a fluid feedstock and particles of a catalyst for gasifying the fluid feedstock in a reactor, comprising said reactor having in an upper portion a circular port through which said particles are fed, a moving bed-forming section disposed on and in communication with said reactor for forming the particles into an annular high-velocity moving bed by dropping the particles downwardly into said reactor while dispersing the particles radially, said moving bed-forming section comprising a controlling section including a chamber having in its lower part a porous plate through which a fluidized gas is fed and in which the moving bed is formed by fluidizing the particles and is adjusted in density by dispersing the particles uniformly in a horizontal direction, an annular forming tube defining therein an annular through passage and having an upper end extending to an upper portion of the moving bed and a lower end connected with said circular port of said reactor, the upper end of the annular forming tube extending to a level above the porous plate so as to form a weir over which the fluidized particles flow into the annular through passage as the fluidized bed increases in height, an external fluid-feed section located so as to spray the feedstock over substantially all of an upper outer periphery of the annular moving bed passing through said reactor, an internal fluid-feed section located so as to spray the feedstock over substantially all of an upper inner periphery corresponding to said outer periphery of the annular moving bed, and a receptacle above the internal fluid-feed section for receiving particles from a particle feed.