Abstract: A method of producing a calcined raw meal and of producing additional steam in an existing steam generator comprises the following steps: pulverized raw meal, hydrocarbon, primary air and secondary air are fed to a calciner system (60), wherein the raw meal is calcined in a temperature range between 850° C. and 950° C., the calcined raw meal is separated from the calciner flue gases at the exit of the calciner system, the calcined raw meal is directed through a cooler (70), in which it exchanges its heat with the secondary air, the calciner exhaust gases are directed in the gas path of the backpass of the steam generator (1) at an appropriate temperature window and are used for steam production. The raw meal consists mainly of limestone (CaCO3) and the calcined material is mainly lime (CaO). The fuel feed (4) to the steam generator (1) is reduced during introduction of the exhaust gases into its backpass.

Abstract: A separating device precipitates solid particles from a gas flow of a circulating fluidized-bed or CFB reactor, wherein the particles are carried along in the gas flow. A device is provided which influences the gas flow in such a way that centrifugal and gravitational forces that are greater than entraining forces of the gas flow act on the solid particles and thus permit particles of a specific minimum size to be separated from the gas flow. A particularly compact construction of a CFB system is achieved when the gas flow emerging from the CFB reactor reaches a flow channel which directs it from top to bottom along a circular arc around a horizontally disposed cyclone axis. The gas flow is fed from there to a take-over channel suitable for passing it on. The flow channel merges in a vertical direction and correspondingly expands downward into a separating chamber in which the precipitated solid particles sink down to a floor.