Selective catalytic reduction of NO x enabled by urea...

Details Selective catalytic reduction of NO x enabled by urea... Selective catalytic reduction of NO x enabled by urea...

2007-04-03

2009-11-10

Vanoy, Timothy C (Department: 1793)

Chemistry of inorganic compounds

Modifying or removing component of normally gaseous mixture

Nitrogen or nitrogenous component

C423SDIG018, C422S105000, C422S168000, C422S177000, C422S180000

Reexamination Certificate

active

07615200

ABSTRACT:
Disclosed are a process and apparatus for selective catalytic reduction of NOx. The process is enabled by passing a heat exchanger section, such as an economizer, of the boiler in advance of an SCR unit at low load conditions to enable NOxreduction even at low loads using urea instead of ammonia. In a preferred form, under high load conditions, the bypass can be almost fully closed and the economizer can be operated normally without excessively cooling the combustion gases, using only a portion of bypassed gases which are hot enough to decompose the urea into its active components including ammonia.

REFERENCES:
patent: 4160009 (1979-07-01), Hamabe
patent: 5988115 (1999-11-01), Anderson et al.

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