Method and apparatus for reducing nitrogen dioxide emissions in a dry sodium scrubbing process using humidification
US5165902A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 31, 1991 |
| Grant date | Nov 24, 1992 |
| Priority date | — |
| Expiry date | Jul 31, 2011 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02A50/20
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A method and apparatus for reducing nitrogen dioxide (NO.sub.2) emissions in a dry sodium scrubbing process without significantly reducing sulfur dioxide (SO.sub.2) and nitrogen oxides (NO.sub.x) removal efficiencies. A sodium additive is injected into a flue gas duct carrying flue gas from a combustor to a particulate collection device to remove sulfur dioxide and nitrogen oxides from the flue gas. The flue gas is humidified by introducing water into the flue gas duct at a point upstream of the sodium additive introduction point. Through control of the moisture content of the flue gas and the temperature in the particulate collection device, the amount of NO.sub.2 emissions is reduced to a value below that which causes the creation of a brown plume emanating from the gas stack.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.