Process for removing SO2 from flue gases using liquid sorbent injection
US10617999B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 12, 2019 |
| Grant date | Apr 14, 2020 |
| Priority date | — |
| Expiry date | Jul 12, 2039 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01D2258/0283
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
Finely atomized alkaline sorbent salt solutions are injected into a hot flue gas stream to remove SO2. Flash evaporation of the droplets produces very fine dried sorbent particles, which react efficiently with SO2 in the flue gas. The liquid sorbent may be sodium carbonate, sodium hydroxide, sodium sulfite, potassium carbonate, potassium hydroxide or the like. In a coal-fired boiler, the liquid sorbent may be injected after the economizer section, where the flue gas temperature is below 850° F., and upstream of a particulate collection device. The dried sorbent particles react with SO2 and then are removed from the flue gas stream in the particulate collection device, producing a cleaned flue gas stream.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.