| 摘要 |
A self-contained single structure for NOx disposal and heat recovery, comprising a burner means (112), including means to supply NOx (oxides of nitrogen) gases (146) to be reduced, primary air (13) in less-than-stoichiometric flow rate, and gaseous fuel (128) at selected flow rate. The gases flow into a first reducing section (114), in which the fuel is burned in a reducing atmosphere, and in NOx gases are reduced. Fire tubes (124) carrying water or steam are positioned to receive heat from the burning gases. At the outlet of the reducing section pre-cooled stack gases (135) are injected (137) into the flame so as to cool the hot products of combustion. The direction of flow of hot gases is turned 90 DEG (164) in a second section. At the end of the second section the direction of flow is turned 90 DEG so as to be counter to the first direction in a third or oxidizing section (182) to which secondary air is added (172) and a fourth or boiler section (124) accepts the hot gases from the oxidizing section to recover the waste heat. |
