NOVELTY - Recycling fine ash particles for a multiphase chemical reactor (MCR), where coal is partially combusted in the MCR to produce an exit gas stream in which fine ash particles are entrained, and where the MCR comprises a high temperature region with a temperature at or above a fusion temperature of the fine ash particles, the method comprises: (a) separating the fine ash particles from the exit gas stream; and (b) returning the fine ash particles collected in step (a) above to the high temperature region.    USE - The method is useful for recycling fine ash particles for a multiphase chemical reactor (MCR) (claimed).    ADVANTAGE - The method can be efficiently and effectively used for collecting and recycling fine solids in a multiphase chemical reactor, e.g. a fluidized bed reactor, an entrained-flow bed reactor, and a fixed bed reactor, in particular as it is used in gasification of coal, biomass and municipal solid waste.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are:    (1) a MCR in which coal is partially combusted in the MCR to produce an exit gas stream in which fine ash particles are entrained, and where the MCR comprises a high temperature region with a temperature at or above a fusion temperature of the fine ash particles, comprising: a fine ash particle collection system for separating the fine ash particles from the exit gas stream, and a fine ash particle conveyor system for returning the fine ash particles to the high temperature region; and    (2) a fluidized bed coal gasification system in which coal-containing fuel particles react with oxygen and steam to produce syngas, the system comprising: (1) a fluidized bed reactor vessel which comprises: (a) an upper portion, where a fluidized bed region is formed during operation, and where an exit gas stream is formed with fly ash particles entrained in it, (b) a lower portion separated from the upper portion by (c) a conically shaped distribution plate with its apex pointing downward, having perforations thereon and a central opening at the apex, where bottom ash formed in the fluidized bed region can fall through the central opening and collected in the lower portion of the reactor vessel, (d) a gas inlet through the opening, through which inlet a gas stream rich in oxygen can be injected into a region just above the distribution plate, where during operation a high temperature region is formed due to enhanced combustion of the carbon material in the region; (2) a fly ash collection subsystem where fly ash particles are separated from the exit gas stream and collected; and (3) a fly ash recycle subsystem, where the fly ash particles collected in the fly ash collection system are returned directly into the high temperature region.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic diagram of a typical fluidized bed reactor system for coal gasification.    Reaction vessel (1)    Gas distribution grid (2)    Inlet (3)    Pipes (6, 24)    First stage cyclone (11)    Second stage cyclone (14)    Heat recovering tower (17)    Fly ash collector (19)    Fly ash lock hopper (21)    Fly ash transfer hopper (23)    High temperature region (25)