| 摘要 |
<p>PURPOSE:To lower the concentration of combustible matter in an exhaust gas recirculation system by burning by the catalytic action of a contact combustion catalyst the combustible matter that is contained in the combustion exhaust gas in a combustion gas recirculation system. CONSTITUTION:Fuel 13 is supplied to a burner 12 and when combustion air 14 is supplied to a wind box 4 through an air preheater 8, air ducts 15, 16, 17 from a forced draft fan 15, the mixture gas burns in the combustion section 10. And, most of the formed combustion exhaust gas 33 passes through a combustion exhaust gas duct 18, nitrogen removal device 7, and air preheater 8 from the outlet 11 of a furnace and is discharged from a chimney 9. And part of the combustion exhaust gas 33 is sent into the inside of a contact combustion catalyst reaction device 23 through a recirculation gas duct 19 from the outlet 11 of the furnace. When the combustible matter contained in the combustion exhaust gas 33 comes in contact with the contact combustion catalyst 24, it burns in a low concentration which is below the limit of its combustibility by the catalytic action in the contact combustion catalyst 24, and the exhaust gas which is made harmless is sent to the side of the combustion furnace 1 from a recirculation blower 6.</p> |
