| 摘要 |
A boiler is provided to recover heat effectively, to have a group of water tubes containing durable fins or extended heat transfer surfaces, and to reduce nitrogen oxides emissions. A boiler(1A) recovering heat effectively and having water tubes containing durable fins includes a boiler drum(10) where an outer water tube bundle(30) and an inner water tube bundle(20) are arranged like rings, a burner(40) at the center of the inner water tube bundle. Space between innermost water tubes(21) and other inner water tubes next to the innermost tubes is closed except for space formed as a conduit of gas. At inner water tubes and/or outer water tubes located at the gas conduit have fins(23).
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