Arrangement for burning fuels in a fluidized bed with an augmented solids circulation in a combustion chamber of a steam generator

A method of burning fuels in a fluidized bed with an augmented solids circulation in a combustion chamber of a steam generator, comprising the steps:

• cooling flue gases to 300.degree. C. to 500.degree. C. and cleaning preliminarily said flue gases in coarse-particle precipitators communicating with said combustion chamber at a top portion of said combustion chamber;
• returning at least a part of resulting solids to the fluidized bed;
• burning fuel in the fluidized bed under pressure;
• maintaining densities of 0.5 to 5 kg of solids per kg of flue gas in a free space above said fluidized bed by fluidizing rates of 1 to 5 m/sec;
• regulating the temperature of said bed and load on said bed by amount of solids returned to the fluidized bed;
• providing said precipitators with solids-extraction outlets communicating with said fluidized bed through feedback means, said free space having heat-convection surfaces;
• and surrounding said combustion chamber, said heat-convection surfaces, said precipitators, and said feedback means by a pressurized vessel.

An arrangement for burning fuels in a fluidized bed with an augmented solids circulation in a combustion chamber of a steam generator, comprising:

• means for cooling flue gases to 300.degree. C. to 500.degree. C. and means for cleaning preliminarily said flue gases in coarse-particle precipitators communicating with said combustion chamber at a top portion of said combustion chamber;
• returning at least a part of resulting solids to the fluidized bed;
• means for burning fuel in the fluidized bed under pressure;
• means for maintaining densities of 0.5 to 5 kg of solids per kg of flue gas in a free space above said fluidized bed by fluidizing rates of 1 to 5 m/sec;
• and means for regulating the temperature of said bed and load on said bed by amount of solids returned to the fluidized bed.