FIELD: heat power engineering. SUBSTANCE: gas duct is formed by housing divided into ascending passage 2 and descending passage 4 by partition made in form of envelope. Reflectors 11 are located in passage 4 opposite holes of nozzle of sprinkler 10. Envelope of partition is located coaxially in housing 1. Housing 1 is provided with jacket 5. Jacket 5 and envelope of partition form high-temperature portion of heating surface. EFFECT: enhanced efficiency. 3 dwg
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