US4205931A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pneumatic ash transporting and containing system
Assignee: Combustion Engineering Inc
•
Filing: 1978-12-04
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Granted: 1980-06-03
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Expires: 1998-12-04
Abstract
Abstract Apparatus including an enclosed pressurized conveying and storage system that will allow potentially explosive flyash or other fine material to be handled with the minimum possibility of damage to the equipment in the event of an explosion. The steel storage vessel is maintained under slight pressure with inert gases by means of a pressure relief valve and an inert gas supply, and is kept at a high enough temperature to prevent condensation of the gas (so that corrosive acids are not formed) by electric inductance heaters and insulation. Airlock valves are used to allow the ash into and out of the transport and containment system.
Inventors
- 👤 Joseph G. Singer
- 👤 Harold E. Collins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 18:40
CPC Classifications
F; F23; F23J; F23J3/00; F23J3/06
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
128 words
A conveying and storage system for handling potentially explosive fines including a duct in which combustion-produced inert gases carrying the fines is flowing, means for separating the fines from the gases, a storage tank, pipe means extending between the separating means and tank, fan means in said pipe means for causing the fines to move to the tank at a positive pressure, means for allowing discharge of the fines from the separating means to the pipe means while preventing any substantial gas flow therebetween, means for supplying inert gas to the tank for maintaining the tank at a positive pressure when combustion-produced inert gas is not available, and pressure relief means for allowing gases to escape from the storage tank in the event of an abrupt pressure increase.
Claim 2
Dependent Claim
128 words
A conveying and storage system for handling potentially explosive fines including a duct in which combustion-produced inert gases carrying the fines is flowing, means for separating the fines from the gases, a storage tank, pipe means extending between the separating means and tank, fan means in said pipe means for causing the fines to move to the tank at a positive pressure, means for allowing discharge of the fines from the separating means to the pipe means while preventing any substantial gas flow therebetween, means for supplying inert gas to the tank for maintaining the tank at a positive pressure when combustion-produced inert gas is not available, and pressure relief means for allowing gases to escape from the storage tank in the event of an abrupt pressure increase.
Claim 3
Dependent Claim
17 words
The system as set forth in claim 1, wherein the fines are flyash discharged from a boiler.
Claim 4
Dependent Claim
38 words
The system as set forth in claim 2, including a bottom opening in the tank, and means for allowing the flyash to be discharged therefrom while preventing any substantial gas flow therethrough while the flyash is being discharged.
Claim 5
Dependent Claim
23 words
The system as set forth in claim 3, including means for fluidizing the flyash in the tank to assist in its discharge therefrom.
References Cited (Backward Citations)
DE1277120B
Cited
US3742874A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-06-03 | 1983-12-03 | 1984-06-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-06-03 | 1987-12-03 | 1988-06-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-06-03 | 1991-12-03 | 1992-06-03 | $7700.00 | Window Closed / Lapsed |