FURNACE-AND-HEAT-EXCHANGER ASSEMBLY Russian patent published in 1996 - IPC

FIELD: gas combustion in hot-water flue boilers for heating liquids. SUBSTANCE: assembly has flue tube with burner unit and convective heating surfaces; flue tube length is 3.3-4 of its diameter; burner unit axis is shifted relative to flue tube axis through 1-1.5 of burner outlet diameter; first and second stages of fire tubes have different diameters: first stage along gas flow is made of tubes of greater diameter; quantity of tubes for first and second stages is chosen from definite condition given in description of invention. EFFECT: improved design. 1 dwg