Low-temperature, moving bed catalytic reactor for control of NOx emissions from combustion
US7776293B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 18, 2008 |
| Grant date | Aug 17, 2010 |
| Priority date | — |
| Expiry date | Jul 18, 2028 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02P20/584
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
An apparatus for low-temperature NOx-reduction is disclosed, which is useful in boiler installations used at electric-generating plants. The apparatus employs one or a plurality of moving-bed reactors wherein a moving bed of common base-metal catalyst is used for selective catalytic reduction of NOx present in flue gas. The moving bed permits continuous introduction of fresh or regenerated catalyst, thus obviating the conventional problems of sulfur-poisoning and consequent reduction in catalytic activity with such catalysts. Due to the lower activation energies of such catalysts, an SCR utilizing the moving-bed reactors disclosed herein can be located downstream of the air heater, further improving electric-generating efficiency. Methods for low-temperature NOx reduction are also disclosed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.