| 摘要 |
The purpose of the present invention is to provide a combustion apparatus, which drops flame temperature by recirculating the part of exhaust gas in an air supply part using differential pressure due to a venturi structure, thereby reducing the discharge amount of nitrogen oxides (NOx) and performing a stable combustion in the whole area of a predetermined load. The combustion apparatus according to the present invention for the effects above comprises: a premixing chamber (200) premixing air and gas; a blower (140) supplying a mixture of the gas and the gas to a burner; a combustion chamber (160) in which combustion is performed by the ignition of the burner; a heat exchanger (170) exchanging heat with water using the combustion heat of the combustion chamber (160); and an exhaust gas outlet part (180) from which the exhaust gas passing through the heat exchanger (170) is discharged. The premixing chamber (200) is shaped into a venturi with a throat part in which a cross section between an inlet and an outlet through which the air passes becomes narrower, wherein the throat part is connected with: a gas supply part (230) supplying combustion gas; and an exhaust gas recirculation pipe (400) allowing the part of the exhaust gas passing through the heat exchanger (170) to flow into the air supply part in proportion to the differential pressure due to the flow rate of the mixture passing through the throat part. |
