| 摘要 |
FIELD: device used for preparation of masout for burning. ^ SUBSTANCE: proposed preheater is provided with finned cast-iron tubes with inserts made from steel finned tubes placed in several cast-iron tubes (in way of motion of waste gases); they are blanked off at the ends; fins made along tubes over generatrices adjoin inner surfaces of cast-iron finned tubes. ^ EFFECT: enhanced efficiency of heat exchange between waste gases and liquid flowing through tubes. ^ 2 dwg
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