Gas or liquid fueled heating boiler uses nozzle in return connection with outlet opening of smaller diameter than connection nipple to emit cone via specified opening angle.

摘要

The return connection (6) is aligned with one of the top connecting nipples (7) between the two last boiler sections (4,10) and the outlet (12) of the nozzle (1) held in the connection (6) has a diameter (Da) that much smaller than the nipple diameter (D) that a hypothetical spray cone (13) between outlet (12) and the opening section (14) of the nipple at some distance from the outlet has an opening angle ( beta ) in the order of 30 deg maximum. The distance (DZ) between outlet (12) and nipple (7) amounts to half the inside width (B) of the last boiler section.