Method and apparatus for regulating fluid flows in parallel-connected conduits (e.g. in furnace installations having air preheaters and by-pass conduits)
US4449569A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 8, 1982 |
| Grant date | May 22, 1984 |
| Priority date | — |
| Expiry date | Mar 8, 2002 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG05D23/22
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
Fluid flow in parallel-connected conduits is regulated by sensing the pressures and/or temperatures at the junctions of the conduits, and regulating the supply of power to a fluid propelling means operable in one of the conduits in accordance with a signal which is representative of the sensed pressure drop and/or temperature drop between the junctions. In a furnace installation having an air preheater (14) in a duct (12) and a parallel-connected by-pass duct (18), the pressure difference and/or temperature difference between the junctions (19, 20) of the ducts (12, 18) is/are employed to generate a signal which regulates the supply of power to an induced draft fan (17) in the air preheater duct (12). The damper (21) normally provided in the by-pass duct (18) may be removed or set at its open position.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.