| 摘要 |
<p>PROBLEM TO BE SOLVED: To arrange the water pipes in at least a partial area of water pipes constituting the inner water pipe row and the outer water row in a zig-zag form along a circumferential direction, increase a turbulent flow of exhaust gas at an exhaust gas passage and increase heat absorption promoting convective heat transfer.SOLUTION: The present invention comprises inner water pipe row 2 having several water pipes 2a arranged in an annular form, adjoining water pipes closely connected to form a circular combustion chamber 1; outer water pipe row 4 having several water pipes 4a arranged in an annular form at outer positions of the inner water pipe row 2, adjoining water pipes 4a closely connected to form an annular exhaust gas passage 3 between it and the inner water pipe row; and annular upper header 5 and lower header 6 each of which is connected to be communicated at the upper end part and the lower end part of each of the water pipes 2a, 4a of both water pipe rows. The water pipes in at least a partial area A of water pipes constituting the inner water pipe row and the outer water row are arranged in a zig-zag form along a circumferential direction.</p> |
