Exhaust gas NO.sub.x removal system
US5282355A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 1, 1992 |
| Grant date | Feb 1, 1994 |
| Priority date | — |
| Expiry date | Sep 1, 2012 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01D53/8625
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
An improved exhaust gas NO.sub.x removal system removes NO.sub.x from exhaust gas through a catalytic reduction process making use of ammonia or its precursor as a reducing agent. The system includes a vaporizer in which ammonia or its precursor is vaporized, and one or a plurality of nozzles provided in a flue upstream of an NO.sub.x removal catalyst layer. The number of nozzles corresponds to a cross-sectional area of the same flue. These nozzles eject the ammonia or its precursor, vaporized by superheated steam within the vaporizer, into the flue. The superheated steam to be used in the vaporizer for evaporating ammonia or its precursor can be taken from the exhaust gas boiler itself in which NO.sub.x removal is to be effected.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.