Fluidized bed reactor

A fluidized bed reactor for granulating and coating particles in very small amounts having an essentially conical product container, a filter housing with filters inserted above the product container, and a lower housing below the conical product container having a process air supply. The product container has a sieve bottom in the center of which is a height-adjustable two-component nozzle. At least one guide element associated with the sieve bottom directs at least part of the process air to the two-component nozzle in a radial manner.