C - Chemistry – Metallurgy – 01 – C
Patent
C - Chemistry, Metallurgy
01
C
23/353, 23/392
C01C 1/18 (2006.01) B01D 53/34 (2006.01)
Patent
CA 1137280
ABSTRACT OF THE DISCLOSURE A self-contained single structure for NOx disposal and heat recovery, comprising a burner means, including means to supply NOx (oxides of nitrogen) gases to be reduced, primary air in less-than-stoichiometric flow rate, and gaseous fuel at selected flow rate. The gases flow into a first reducing section, in which the fuel is burned in a reducing atmosphere, and the NOx gases are reduced. Fire tubes carrying water or steam are positioned to receive heat from the burning gases. At the outlet of the reducing section precooled stack gases are injected into the flame so as to cool the hot products of combustion. The direction of flow of hot gases is turned 90° in a second section. At the end of the second section the direction of flow is turned 90° so as to be counter to the first direction in a third or oxidizing section to which secondary air is added and a fourth or boiler section accepts the hot gases from the oxidizing section to recover the waste heat.
357850
Hart Wallace F.
Reed Robert D.
Watts David O.
Smart & Biggar
Zink (john) Company
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