Apparatus and method for reduction of NOx emissions from a fluid bed combustion system through staged combustion
US4308810A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 9, 1980 |
| Grant date | Jan 5, 1982 |
| Priority date | — |
| Expiry date | Apr 9, 2000 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF27B15/14
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
Apparatus and method for the reduction of nitrogen oxides (NOx) in the emissions of a fuel burning fluidized bed combustion system. Using a staged combustion technique, an overfire air inlet is provided in the freeboard zone above the bed. In the first stage, residual oxygen (O.sub.2) in the off-gas just above the bed is held in the 0.4 to 0.8% range by the actual coal and air rates. In the second stage, carbon monoxide (CO) and unburned hydrocarbons, both present in the first stage off-gas, are combined with additional air using the overfire air inlet. CO levels in the final effluent are reduced with little or no increase in NOx emissions.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.