COMBUSTION APPARATUS

摘要

The present invention relates to a combustion apparatus capable of reducing the emission amount of nitrogen oxide and enabling stable combustion in the entire area of a set load. The combustion apparatus includes: a premixing chamber for premixing air and a gas; a blower for supplying a mixed-gas of the air and the gas to a burner; a combustion chamber for burning the mixed-gas by ignition of the burner; a heat exchanger for exchanging heat with water by using combustion heat in the combustion chamber; and an exhaust gas discharge part for discharging the exhaust gas passing through the heat exchanger, wherein the premixing chamber is formed in a Venturi shape having a throat part of which the cross-section area is tapered between an inlet and an outlet through which the air passes, the throat part of the premixing chamber being connected to a gas supply part for supplying a gas for combustion, and to an exhaust gas recirculation tube to which some of the exhaust gas having passed through the heat exchanger is introduced in proportion to differential pressure according to the flow rate of the mixed-gas passing through the throat part.

主权项

1. A combustion apparatus comprising:
a premixing chamber in which air is mixed with a gas; a blower for supplying the mixed-gas of the air and the gas to a burner; a combustion chamber in which combustion is performed by ignition of the burner; a heat exchanger in which water is heat-exchanged with combustion heat of the combustion chamber; an exhaust gas discharge part from which an exhaust gas passing through the heat exchanger is discharged, wherein the premixing chamber has a venturi shape having a throat part, which is gradually reduced in section area from an inlet and an outlet of the premixing chamber to a central portion thereof, between the inlet and the outlet through which the air passes, and a gas supply part supplying a combustion gas and an exhaust gas recirculation tube are connected to the throat part of the premixing chamber so that a portion of the exhaust gas passing through the heat exchanger is introduced in proportional to a differential pressure according to a flow rate of the mixed-gas passing through the throat part.