| 摘要 |
PROBLEM TO BE SOLVED: To improve throttling property and suppress generation of unburnt gas and ignition sound at the time of ignition in a combustion device of thick/ thin fuel combustion. SOLUTION: A device has such an arrangement that thin fuel burner ports 22 and thick fuel burner port 21 having substantially a circular form are disposed, that the thin fuel burner ports 21 are located at the center, and that the thick fuel burner ports are located at the periphery of the thin fuel burner ports 22. Thus a uniformly thin fuel flame 27 is formed, which is surrounded by a thick fuel flame 26 to effectively suppress lifting of the thin fuel flame 27. In this way, the throttling property can be improved. As there is no jetting, between the thick fuel burner ports 21, of thin premixed gas which can be hardly combusted, easy inflammability is realized and generation of unburnt gas and ignition sound at the time of ignition can be suppressed.
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