Method and apparatus for treating exhaust gas
US8420034B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 26, 2009 |
| Grant date | Apr 16, 2013 |
| Priority date | — |
| Expiry date | Aug 5, 2029 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01D2257/602
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
In an exhaust gas treatment, the amount of a highly corrosive mercury-halogenating agent to be added is reduced with the mercury-removing efficiency maintained high.A mercury-halogenating agent (40) and ammonia (30) are added to combustion exhaust gas from a boiler, the exhaust gas containing NOx, SOx and mercury. The exhaust gas is brought into contact with a CO/HC oxidation catalyst (50) and is then subjected to reduction denitration (60) in the presence of a solid catalyst. Thereafter, metallic mercury is oxidized to halogenated mercury. Then, the exhaust gas is wet-desulfurized (100) with the alkaline absorbing solution, and the halogenated mercury is removed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.