Method and plant for producing low-temperature coke

摘要

The present invention relates to a method and a plant for producing low 15 temperature coke, in which granular coal and possibly further solids are heated to a temperature of 700 to 1050° C. in a fluidized-bed reactor ( 2 ) by means of an oxygen-containing gas. To improve the utilization of energy it is proposed to introduce a first gas or gas mixture from below through at least one gas supply tube ( 3 ) into a mixing chamber region ( 8 ) of the reactor ( 2 ), the gas supply tube ( 3 ) being at least partly surrounded by a stationary annular fluidized bed ( 6 ) which is fluidized by supplying fluidizing gas. The gas velocities of the first gas or gas mixture and of the fluidizing gas for the annular fluidized bed ( 6 ) are adjusted such that the Particle-Froude-Numbers in the gas supply tube ( 3 ) are between 1 and 100, in the annular fluidized bed ( 6 ) between 0.02 and 2 and in the 25 mixing chamber ( 8 ) between 0.3 and 30.