Method and system for reducing nitrogen oxide and sulfur oxide emissions from carbonaceous fuel combustion flue gases
US5967061A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 14, 1997 |
| Grant date | Oct 19, 1999 |
| Priority date | — |
| Expiry date | Jan 14, 2017 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF23J2215/10
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A method and system is provided for the reduction of nitrogen and sulfur oxides emissions from carbonaceous fuel combustion flue gases. The method includes the injection of coal water slurry as a reburn fuel into furnace flue gases to partially oxidize the coal water slurry thereby producing reducing gas species in a reburn zone that convert flue gas nitrogen oxides to diatomic nitrogen. Optionally, sulfur oxides may also be removed from the flue gas by adding alkali compounds to the coal water slurry before injecting the slurry into the furnace, or by injecting the alkali compounds separately into the reducing reburn zone in the furnace created by the partial oxidation of the coal water slurry reburn fuel. The alkali compounds react with the sulfur species to produce alkali sulfite and sulfate particulate solids, which can be removed in a downstream particulate removal device such as an electrostatic precipitator or bag house.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.