US4980092A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for the destruction of chemically stable waste
Assignee: Airbus Group SAS
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Filing: 1989-04-11
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Granted: 1990-12-25
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Expires: 2009-04-11
Abstract
Abstract A method for the destruction of chemical stable waste by pyrolysis whereby heat is applied to the waste using at least one plasma torch formed of non-transferred arc plasma type. The waste generated inside a duct having an end orifice flows upward passing the orifice and toward the nozzle of the plasma torch, wherein the axis of the nozzle of the plasma torch and the axis of the orifice are substantially collinear. Gaseous and/or liquid waste products resulting from the heating step are subjected to expansion and combustion in the combustion chamber whereby gaseous products resulting from combustion and expansion are quenched and then washed.
Inventors
- 👤 Didier M. J. M. Pineau
- 👤 Yves H. G. Valy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 01:03
CPC Classifications
G; G21; G21F; G21F9/00; G21F9/28; G21F9/30; G21F9/32; C; C10; C10B; C10B53/00
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
66 words
A method for destroying chemically stable waste by pyrolysis, comprising the steps of: (a) generating a flow of waste inside a duct having an end orifice, said flow of waste passing through said orifice; and (b) directing the tongue of a non-transferred arc plasma torch towards said orifice, the axis of the nozzle of said plasma torch and the axis of said orifice being substantially collinear.
Claim 2
Independent Claim
66 words
A method for destroying chemically stable waste by pyrolysis, comprising the steps of: (a) generating a flow of waste inside a duct having an end orifice, said flow of waste passing through said orifice; and (b) directing the tongue of a non-transferred arc plasma torch towards said orifice, the axis of the nozzle of said plasma torch and the axis of said orifice being substantially collinear.
Claim 3
Dependent Claim
27 words
The method as claimed in claim 1, wherein the diameter of said orifice is equal to a few times the diameter of the nozzle of said torch.
Claim 4
Dependent Claim
20 words
The method as claimed in claim 1, wherein at least the distance between said torch and said orifice is adjustable.
Claim 5
Dependent Claim
34 words
The method as claimed in claim 1, wherein the axes of said nozzle and of said orifice are substantially vertical and wherein at least in the vicinity of said orifice, said waste flows upwards.
Claim 6
Dependent Claim
30 words
The method as claimed in claim 1, wherein gaseous and/or liquid products resulting from the action of said torch on said flow of waste are subjected to expansion and combustion.
Claim 7
Dependent Claim
28 words
The method as claimed in claim 1, wherein the diameter of said orifice is equal to two or three times the diameter of the nozzle of said torch.
Claim 8
Dependent Claim
23 words
The method as claimed in claim 1, wherein the axes of said nozzle and of said orifice are slanted with respect to vertical.
Claim 9
Dependent Claim
58 words
The method of claim 5, wherein the movement of the gaseous and/or liquid products resulting from the action of said torch on said flow of waste is limited by baffles disposed within the combustion chamber and opposite to said nozzle and said orifice, whereby said products are not projected too far from the tongue of said plasma torch.
Claim 10
Dependent Claim
22 words
The method as claimed in claim 5, wherein said gaseous products resulting from said expansion and said combustion are quenched, then washed.
Claim 11
Dependent Claim
23 words
The method as claimed in claim 1, applied to solid waste, wherein said solid waste is transformed into paste extrudable through said orifice.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-12-24 | 1994-06-25 | 1994-12-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-12-24 | 1998-06-25 | 1998-12-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-12-24 | 2002-06-25 | 2002-12-25 | $7700.00 | Window Closed / Lapsed |