In situ filter cleaning system for gas streams
US5358552A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 30, 1992 |
| Grant date | Oct 25, 1994 |
| Priority date | — |
| Expiry date | Jul 30, 2012 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01D46/79
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
The filtration system comprises a holding vessel and a filter for clarifying contaminated influent gas streams by passing the stream through the filter. The holding vessel has an inlet port for receiving the influent gas to be filtered and for draining the vessel and an outlet port for delivering the clean effluent for further processing. When the particulate matter has clogged the filter and increases the differential pressure across the filter such that it interferes with the normal filtration operation, the particulate matter is cleaned from the filter by isolating the holding vessel from the gas stream and introducing a liquid into the holding vessel and then by backwashing the liquid so that it flows through the holding vessel and the filter in the opposite direction of the influent gas. Backwashing the liquid from the holding vessel dislodges and removes the layer of solid particulate matter on the filter surface and the quantities of particulate matter trapped within the interior of the filter. In a preferred embodiment, the liquid is backwashed by introducing a controlled quantity of pressurized gas into the clean downstream side of the vessel and rapidly opening the drain …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.