FIELD: gas treatment. SUBSTANCE: waste gas releasing in combustion chamber and contaminated with fly ash, harmful gaseous substances, and returned solid particles is partly dedusted in the first solid particles separator and introduced into fluidized-bed reactor after addition of at least one absorption reagent (calcium oxidation and/or hydroxide). Temperature in reactor is controlled within a range of 50 to 90 C by addition of water. Waste gas containing solid substances is discharged from fluidized-bed reactor and fed into the second solid particles separator, first part of solids separated in the latter being returned into reactor and the second part returned into cooled zone of combustion chamber. Solids separated in the first separator are discarded through pipeline from the cycle. EFFECT: reduced expenses due to use of more accessible absorption material. 6 cl, 1 dwg
