| 摘要 |
PURPOSE: A three-stage boiler is provided to reduce the consumption of fuel by flowing combustion gas backward and extending the stay of the combustion gas. CONSTITUTION: A boiler(10) is divided into an upper, middle, and lower heating chamber(3,2,1) by two partitions(4,4') having a hot-water circulation port(5). Each circulation heating tank(7,8,9) is installed in the heating chambers respectively, and is communicated each other. A first and a second communicating tube(14) flow combustion gas backward.
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