Method of purifying combustion product gases contaminated with dust and noxious gases
US4839147A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 25, 1988 |
| Grant date | Jun 13, 1989 |
| Priority date | — |
| Expiry date | Feb 25, 2008 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02A50/20
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
In order to achieve the removal of SO.sub.2 and NO.sub.x together with the entrained dust from the combustion product gases discharged from the combustion chamber of a steam generator in which sulfur-containing fuel, such as for instance lignite or brown coal is being burned, NH.sub.3 and/or NaHCO.sub.3 or chemical substances which release these compounds or react with the combustion product gases to form these compounds are introduced into the already partially cooled combustion product gases in the temperature region below 500.degree. C. upstream of a dry separator, such as for instance a cloth filter. The entrained ashes are to contain CaO or Ca(OH).sub.2 and/or Na.sub.2 CO.sub.3, especially from a previous desulfurization unit, prior to the introduction of the NH.sub.3 thereinto.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.