Process for cooling and cleaning flue gases
US5878677A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 24, 1996 |
| Grant date | Mar 9, 1999 |
| Priority date | — |
| Expiry date | Oct 24, 2016 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01J8/26
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
To cool and clean flue gases from a furnace of a waste incineration plant, the flue gases are fed to a fluidized-bed reactor (6) as fluidizing gases in a first stage (1), into which solid sorbents are simultaneously introduced to remove gaseous pollutants. Solids discharged from the fluidized-bed reactor (6), together with the unused sorbents, are preferably recirculated via a fluid-bed cooler (15). Whereas in the first stage (1), at temperatures above 600.degree. C., optimum conditions, in particular for removing SO.sub.2, are created, the flue gases are further cooled and treated in a second stage (2a, 2b, 2c). In a second circulating fluidized bed, at temperatures below 600.degree. C., excellent conditions are created for HCl removal. In addition to the optimum gas cleaning, efficient cooling is also achieved, corrosion problems on heat-transfer surfaces also being solved.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.