US4718362A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Waste destruction
Assignee: SKF Steel Engineering AB
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Filing: 1986-04-09
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Granted: 1988-01-12
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Expires: 2006-04-09
Abstract
Abstract The present invention relates to a method of destroying waste to form a leach-proof slag and a gas containing only H 2 and CO as combustible constituents. The method comprises the steps of: (a) supplying waste material at the top of a shaft furnace while simultaneously supplying energy in the form of hot oxidizing gas at the bottom of the shaft furnace, (b) discharging liquid slag from the bottom of the furnace shaft and withdrawing the gas generated, at the top of the furnace shaft, and (c) supplying the gas generated, to a subsequent reaction chamber while simultaneously supplying energy in the form of a hot gas.
Inventors
- 👤 Sven Santen
- 👤 Sven Eriksson
- 👤 Lars Bentell
- 👤 Hakan Johansson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 20:38
CPC Classifications
F; F23; F23J; F23J15/00; F23J15/02; B; B01; B01D; B01D53/00; B01D53/34; B01D53/46; B01D53/68; B01D53/74; B01D53/86; B01D53/8668; F23G; F23G5/00; F23G5/02; F23G5/027; F23G5/08; F23G5/085; B01D2259/00; B01D2259/80; B01D2259/818; F23G2204/00; F23G2204/20; F23G2204/201; F23J2215/00; F23J2215/30; F23J2219/00; F23J2219/60
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
108 words
A method of destroying waste to form a leach-proof slag and a gas containing only H 2 and CO as combustible constituents, comprising the steps of: (a) supplying a waste material at the top of a shaft furnace while simultaneously supplying energy in the form of hot oxidizing gas at the bottom of the shaft furnace, (b) discharging liquid slag from the bottom of the furnace shaft and withdrawing the gas generated at the top of the furnace shaft, and (c) supplying the gas generated to a subsequent reaction chamber, while simultaneously supplying energy in the form of a hot gas heated by means of a plasma generator.
Claim 2
Independent Claim
108 words
A method of destroying waste to form a leach-proof slag and a gas containing only H 2 and CO as combustible constituents, comprising the steps of: (a) supplying a waste material at the top of a shaft furnace while simultaneously supplying energy in the form of hot oxidizing gas at the bottom of the shaft furnace, (b) discharging liquid slag from the bottom of the furnace shaft and withdrawing the gas generated at the top of the furnace shaft, and (c) supplying the gas generated to a subsequent reaction chamber, while simultaneously supplying energy in the form of a hot gas heated by means of a plasma generator.
Claim 3
Dependent Claim
24 words
A method according to claim 1, wherein the hot gas supplied to the subsequent reaction chamber consists of air, recirculated gas or nitrogen gas.
Claim 4
Dependent Claim
16 words
A method according to claim 1, wherein water apour is injected into the subsequent reaction chamber.
Claim 5
Dependent Claim
17 words
A method according to claim 1, wherein finely distributed coke is injected into the subsequent reaction chamber.
Claim 6
Independent Claim
128 words
A method of destroying waste to form a leach-proof slag and a gas containing only H 2 and CO as combustible constituents, comprising the steps of: (a) supplying a waste material at the top of a shaft furnace while simultaneously supplying energy in the form of a hot oxidizing gas at the bottom of the shaft furnace, the hot oxidizing gas supplied to the bottom of the shaft furnace having been heated in a plasma generator, (b) discharging liquid slag from the bottom of the furnace shaft and withdrawing the gas generated at the top of the furnace shaft, and (c) supplying the gas generated to a subsequent reaction chamber, while simultaneously supplying energy in the form of a hot gas heated by means of a plasma generator.
Claim 7
Independent Claim
128 words
A method of destroying waste to form a leach-proof slag and a gas containing only H 2 and CO as combustible constituents, comprising the steps of: (a) supplying a waste material at the top of a shaft furnace while simultaneously supplying energy in the form of a hot oxidizing gas at the bottom of the shaft furnace, the hot oxidizing gas supplied to the bottom of the shaft furnace having been heated in a plasma generator, (b) discharging liquid slag from the bottom of the furnace shaft and withdrawing the gas generated at the top of the furnace shaft, and (c) supplying the gas generated to a subsequent reaction chamber, while simultaneously supplying energy in the form of a hot gas heated by means of a plasma generator.
Claim 8
Independent Claim
20 words
A method according to claims 1, wherein the hot gas supplied to the bottom of the shaft consists of air.
Claim 9
Independent Claim
22 words
A method according to claims 1, wherein the gas formed in step (c) is subjected to catalytic cleaning in a further step.
Claim 10
Dependent Claim
20 words
A method according to claim 7, wherein the gas is conducted through a filler consisting of lime in lump form.
Claim 11
Dependent Claim
14 words
A method according to claim 1, wherein pulverized lime is injected into the gas.
Claim 12
Independent Claim
30 words
A method according to claims 1, wherein any chlorine impurities present in the gas are cracked by allowing the gas to pass through a chamber containing a filler of quicklime.
Claim 13
Independent Claim
28 words
A method according to claims 10 wherein quicklime produced by heating lime to clacining temperatures using gas from said subsequent reaction chamber is utilized for the cracking process.
Claim 14
Independent Claim
27 words
A method according to claims 1, wherein the process is controlled so that the temperature in the gas leaving the shaft furnace is at most 800° C.
Claim 15
Dependent Claim
37 words
A method according to claim 5, wherein the quantity of energy supplied to the subsequent chamber is controlled so that the temperature of the gas mixture generated in the subsequent reaction chamber is above about 1000° C.
Claim 16
Dependent Claim
22 words
A method according to claim 5, wherein the gas formed in step (c) is subjected to catalytic cleaning in a further step.
Claim 17
Dependent Claim
20 words
A method according to claim 14, wherein the gas is conducted through a filler consisting of lime in lump form.
Claim 18
Dependent Claim
14 words
A method according to claim 7, wherein pulverized lime is injected into the gas.
Claim 19
Dependent Claim
31 words
A method according to claim 16, wherein the gas contains chlorine impurities and said impurities are cracked by allowing the gas to pass through a chamber containing a filler of quicklime.
Claim 20
Dependent Claim
22 words
A method according to claim 17, wherein quicklime produced by heating lime to calicining temperatures using gas from said subsequent reaction chamber.
Claim 21
Dependent Claim
28 words
A method according to claim 18, wherein the process is controlled so that the temperature in the gas leaving the shaft furnace is no greater than 800° C.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-01-11 | 1991-07-13 | 1992-01-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-01-11 | 1995-07-13 | 1996-01-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-01-11 | 1999-07-13 | 2000-01-12 | $7700.00 | Window Closed / Lapsed |