| 摘要 |
PURPOSE:To furnish a method for alternating combustion by recirculation of an exhaust gas and use of oxygen which can be applied to a combustion furnace using fossil fuel or the like and is suitable particularly for a high-temperature heating furnace such as a glass melting furnace. CONSTITUTION:In alternating combustion equipment wherein one set of two burners 2 and 3 equipped with heat storage bodies B and A respectively or a plurality of sets of the burners are provided for a furnace body 1 and the burners are made to conduct alternating combustion by a switching device 4 for preheating air for combustion, a circulating circuit 5 for circulating part of a combustion exhaust gas is added to the switching device, while an oxygen mixing device 6 is provided for the circulating circuit, and pseudo-air or an oxidizing agent for combustion prepared from a circulated exhaust gas and oxygen is supplied for the combustion. Since the combustion by the oxidizing agent not containing N2 to be a source of generation of a nitrogen oxide NOx is realized according to this system, realization of super-low-NOx or zero- NOx combustion is enabled, and since CO2 and H2O releasing radiation heat energy are filled up inside a furnace, besides, a heat transfer efficiency is improved. Since the concentration of oxygen in the oxidizing agent can be varied freely, moreover, an optimum flame can be produced. |
