COMBUSTION DEVICE

PURPOSE:To make a stable combustion by a method wherein both side surfaces of a thin flame burner and a thick flame burner are provided with through-pass holes and flame holes of both burners are communicated to each other through the through- pass holes. CONSTITUTION:A part of thin mixture gas of a thin flame burner 2 is flowed into a flame hole of a thick flame burner 3 having a low inner pressure through a through- pass hole 5 due to a pressure difference between a thick burner and a thin burner during combustion, injected out while being mixed with a part of the thick mixture gas at the thick flame burner 3, and flame is formed. That is, the mixture gas of intermediate concentration of the thick flame is partially injected from the flame hole surface of the thick flame burner 2, resulting in that a lack of air occurs due to an external disturbance such as applying of inverse pressure to the discharged gas and in the case that a gas concentration of the thick mixture gas becomes a high concentration where a stable combustion may not be carried out, the mixture gas with the intermediate concentration shows a well-suitable concentration, the flame is stabled and then a lifting of the thick flame is prevented under the flame holding action. With such an arrangement as above, it is possible to perform a stable combustion.