Method of dehumidifying and drying powdered or granular material and system for dehumidifying and drying powdered or granular material
US9044705B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 31, 2008 |
| Grant date | Jun 2, 2015 |
| Priority date | — |
| Expiry date | Mar 1, 2031 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01D2259/4009
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A system for dehumidifying and drying a powdered or granular material having a drying hopper, a dehumidifying unit, and a circulation route having a processing gas supply route and a processing gas dehumidifying route that interconnect the drying hopper and the dehumidifying unit to allow processing gas to circulate is proposed. The system repeatedly supplies and circulates the processing gas in the circulation route. The processing gas supply route and the processing gas dehumidifying route are interconnected by a bypass route having a regulation valve. A temperature sensor for detecting the temperature of processing gas exhausted from the drying hopper is installed in the processing gas dehumidifying route. The system further has a control means for controlling opening or closing of the regulation valve, provided in the bypass route, based on a temperature detection signal detected by the temperature sensor. The control by the control means is performed under the condition that the total circulation amount of the processing gas circulated in the circulation route, including the amount of the gas passing through the bypass route, is held substantially constant.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.