| 摘要 |
PROBLEM TO BE SOLVED: To achieve a reduction in NOx and CO with a simple structure of a boiling body and a burner themselves. SOLUTION: A plurality of first water tubes 5 are arranged annularly to form a first water tube train 6, and a combustion chamber 9 is provided inside the first water tube train 6. A first opening part 7 is disposed at a part of the first water tube train 6 and a plurality of cooling water tubes 10 are arranged in a ring, in an area where a gas exists in the combustion chamber 9 during combustion reaction to form a cooling water tube train 11. A clearance 12 is provided between the adjacent cooling water tubes 10 to allow passage of the gas during the combustion reaction, and an area 13 where the combustion reaction is conducted continuously between the cooling water tube train 11 and the first water tube train 6 is provided, to let the gas contact each of the cooling water tubes 10 almost uniformly during the combustion reaction.
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