Process and apparatus for catalytically reducing noxious substances in flue gas
US4810476A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 6, 1987 |
| Grant date | Mar 7, 1989 |
| Priority date | — |
| Expiry date | Nov 6, 2007 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S423/13
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
An apparatus and process for catalytically reducing noxious substances in flue gas wherein a heat exchanger is traversed from a top section to a bottom section by a plurality of heat storage elements which are separately movable and are charged by the flue gas transversely to their direction of movement. At least a portion of the heat storage elements are provided with a catalyst coating. Flue gas cooled downstream of a desulfurization system is conducted through the bottom section of the heat exchanger where it is preheated by the heat storage elements and is then heated to a predetermined reaction temperature by an external heating means. Ammonia is added and the flue gas is conducted at least once through at least one middle section of the heat exchanger for the catalytic reduction of the noxious substances. Then, the flue gas is conducted through the top section of the heat exchanger so as to cool it to a predetermined chimney entrance temperature. Not only is a decrease in catalytic activity prevented, but an adverse affect on the efficiency of the catalyst due to leakages from a gas preheater for the flue gas is prevented so that the heat exchanger can be used advantageously …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.