FIELD: thermal engineering. SUBSTANCE: circulating fluidized-bed reactor 30 (combustion chamber) has main internal pulse-operated particle trap 58 provided with cavity 70 and particle return facility 72 in upper part of reactor casing to ensure direct internal return of entire main entrapped solid phase to lower part of reactor 30 (combustion chamber) for next recirculation dispensing with special external and internal pipelines. Internal particle return facility 72 is located in reactor casing only and is made for easy and free drop of particles along casing wall to its lower part. EFFECT: simplified design, provision for complete entrapping of particles and their return to combustion zone. 28 cl, 22 dwg
