Disposal of oxides of nitrogen and heat recovery in a single sel

Details Disposal of oxides of nitrogen and heat recovery in a single sel Disposal of oxides of nitrogen and heat recovery in a single sel

1979-03-01

1981-01-13

Ciarlante, Anthony V.

Liquid heaters and vaporizers

Miscellaneous

423235, C01B 2120

Patent

active

042443253

ABSTRACT:
A self-contained single structure for NOX disposal and heat recovery, comprising a burner means (12), including means to supply NOX (oxides of nitrogen) gases (146) to be reduced, primary air (130) 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 the 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 precooled 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 to 90.degree. (164) in a second section. At the end of the second section the direction of flow is turned 90.degree. 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.

REFERENCES:
patent: 2673141 (1954-03-01), Barman
patent: 3232713 (1966-02-01), Felder
patent: 3612001 (1971-10-01), Gossalter
patent: 3776199 (1973-12-01), Miller
patent: 3816595 (1974-06-01), Lahaye et al.
patent: 3873671 (1975-03-01), Reed et al.
patent: 3911083 (1975-10-01), Reed et al.
patent: 4050877 (1977-09-01), Craig et al.

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