Patent ID: 7803268

Claim:
A method of producing low-temperature coke, in which granular coal is heated to a temperature of 700 to 1050° C. in a fluidized-bed reactor by an oxygen-containing gas, comprising: introducing from below a first gas or gas mixture through at least one gas supply tube with an upper orifice into a mixing chamber of the fluidized-bed reactor so as to entrain solids from a stationary annular fluidized bed into the mixing chamber when passing through the upper orifice, the at least one gas supply tube being at least partly surrounded by the stationary annular fluidized bed extending beyond the upper orifice, the solids being entrained from the stationary annular fluidized bed extending beyond the upper orifice upon the first gas or gas mixture passing through an upper orifice region; fluidizing the stationary annular fluidized bed by supplying fluidizing gas; and adjusting gas velocities of the first gas or gas mixture and the fluidizing gas for the stationary annular fluidized bed such that the Particle-Froude-Number is a) in the at least one gas supply tube between 1 and 100, b) in the stationary annular fluidized bed between 0.02 and 2, and c) in the mixing chamber between 0.3 and 30.