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A steam generator arranged as a single-pass boiler with a stationary fluidized-bed hearth and a superimposed ash-circulating system. The fluidized bed is divided into several individually controllable sections to which, in each instance, there is associated a belt-charging machine, an ash separation

A steam generator arranged as a single-pass boiler with a stationary fluidized-bed hearth and a superimposed ash-circulating system. The fluidized bed is divided into several individually controllable sections to which, in each instance, there is associated a belt-charging machine, an ash separation and ash return system, and a secondary air feed line.

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1. A steam generator comprising: a stationary fluidizedbed hearth; a combustion chamber and a gas flue containing outlet-side heating surfaces above said fluidized-bed hearth; immersion-type heating surfaces arranged in said fluidized bed; said fluidized bed being divided into a plurality of individ

1. A steam generator comprising: a stationary fluidizedbed hearth; a combustion chamber and a gas flue containing outlet-side heating surfaces above said fluidized-bed hearth; immersion-type heating surfaces arranged in said fluidized bed; said fluidized bed being divided into a plurality of individually controlled sections; said steam generator comprising further a single-pass boiler; a gas extractor tube and a cyclone connected to said gas extractor tube at the upper end of said boiler above each section of said fluidized bed; said cyclone having discharge means passing cyclone disclosure to a respective predetermined section; belt-charging means associated with each section and having a spread corresponding to the cross-section of a section; and secondary air feeds arranged above each section. 2. A steam generator according to claim 1, wherein gas temperature at an inlet to said cyclone is substantially 350° C. 3. A steam generator according to claim 1, including a hot-gas filter following said cyclone on a gas-flow path; and an air preheater with rotating accumulators following said hot-gas filter. 4. A steam generator according to claim 1, including an ash line leading from the discharge means of the cyclone to said fluidized-bed hearth; and an ash discharge in said ash line means. 5. A steam generator according to claim 1, wherein said combustion chamber comprises circulation tubes with sides facing said combustion chamber; and a fire-resistant mass on said sides of said circulation tubes. 6. A steam generator according to claim 1, wherein at least a part of said immersion-type heating surfaces are controlled as superheaters. 7. A steam generator according to claim 1, wherein said fluidized bed has a superimposed ash circulating system of predetermined quantity matched to a particular fuel in use. 8. A steam generator according to claim 7, wherein total circulating quantity is adjustable through vortex speed within said fluidized bed. 9. A steam generator according to claim 7, wherein total circulating quantity is adjustable by degree of separation of the cyclone which is changeable by fittings.