FIELD: steam generators. SUBSTANCE: steam generator works on fossil fuel; it is provided with gas duct whose guarding wall 2 is formed by pipes 4 which are connected by gastight joint and are mainly located vertically. According to invention, pipes 4 have larger inner diameter $$$ in first or in lower portion of gas duct 5 as compared with pipe lying above second portion 7 of gas duct, thus providing for reliable cooling of pipes 4 on one side and for excessive heating of separate pipes 4 on other side and consequently excluding inadmissible difference between outlet temperatures of pipes 4. EFFECT: enhanced efficiency. 10 cl, 2 dwg
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