Method of reducing the nitrogen dioxide content of flue gas from

Details Method of reducing the nitrogen dioxide content of flue gas from Method of reducing the nitrogen dioxide content of flue gas from

1989-12-04

1991-11-05

Woodard, Joye L.

Distillation: processes, thermolytic

Miscellaneous

202141, 202142, 202151, C10B 2118

Patent

active

050629255

ABSTRACT:
The method of reducing a nitrogen oxides content of a flue gas generated on firing of a rich gas or combination coke oven having a plurality of heating walls forming dual heating flues, in which a single stage or multistage combustion takes place, and also having a plurality of regenerators for recovery of flue gas heat and preheating of an underfiring medium, includes the steps of mixing one portion of the flue gas drawn from one flue of the dual heating flues with the underfiring medium, gas and/or air, prior to or on admission to the other flue of the dual heating flues, or a regenerator connected with it, and circulating another portion of the flue gas additionally inside the dual heating flues. The method advantageously also may include recirculating externally at a predetermined flow rate the one portion of the flue gas considering the recirculating of the other portion of the flue gas inside the dual heating flues and controlling the recirculating so that a flame temperature in the heating flues is kept constant based on a heat balance in the heating flues, and feeding, during rich gas firing of the combination coke oven, the one portion of the flue gas recirculated externally only to those of the regenerators, which receive the underfiring media during lean gas operation, and, during rich gas operation, only to every second one of the regenerators.

REFERENCES:
patent: 1993574 (1935-03-01), Totzek
patent: 2746913 (1956-05-01), Schurhoff
patent: 3047474 (1962-07-01), Tucker
patent: 3345051 (1967-10-01), Ackeren
patent: 3389156 (1974-10-01), Jakobi et al.
patent: 4102751 (1978-07-01), Stalherm et al.
patent: 4141797 (1979-02-01), Pries et al.
patent: 4574034 (1986-03-01), Lemke et al.

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