Hot gas filtration system fail-safe and thermal regeneration device
US5433771A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 25, 1994 |
| Grant date | Jul 18, 1995 |
| Priority date | — |
| Expiry date | Apr 25, 2014 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01D2275/307
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A fail-safe back-up filter system for filtering particles from a flow of hot gas in a coal gasifier or the like in the event of a failure of the primary filter system. In the event of a break in one of the primary filter elements of the filtration system, the back-up filters, having a higher porosity than the primary filters, begin to collect particulate matter such that the particulates become embedded in the back-up filter. After a period of time, the back-up filters become clogged and prevent the flow of particle laden gas through the back-up filter and the corresponding primary filter such that the flow of gas is diverted into communication with the remaining, properly functioning primary filters. The back-up filters also provide a thermal regenerator device for heating the flow of cleaning gas before it contacts the primary filter elements during back-flush cleaning in order to avoid the effects of extreme temperature fluctuations on the primary filters.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.