Patent US1645897A successfully refreshed from Google Patents.
US4615285A
Expired / Lapsed
US
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Method of destroying hazardous wastes
Assignee: SKF Steel Engineering AB
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Filing: 1985-04-05
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Granted: 1986-10-07
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Expires: 2005-04-05
Abstract
Abstract The invention relates to a method of destroying hazardous waste, by means of under-stoichiometric incineration at a temperature of at least 1200° C., the ratio between injected waste material and oxidant being regulated to give a quotient CO 2 /(CO+CO 2 ) of less than 0.1.
Inventors
- 👤 Lars Bentell
- 👤 Jarl Martensson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 07:36
CPC Classifications
F; F23; F23G; F23G5/00; F23G5/08; F23G5/14; F23G5/16; F23G5/085; F23G7/00; F23G7/008; F23G2204/00; F23G2204/20; F23G2204/201; F23G2206/00; F23G2206/20; F23G2206/201; F23G2900/00; F23G2900/70; F23G2900/7011; Y; Y02; Y02E; Y02E20/00; Y02E20/30; Y02W; Y02W10/00; Y02W10/40
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
81 words
A method of destroying hazardous waste material which contains chlorinated hydrocarbons comprising incinerating said waste material at a temperature of at least 1200° C. using under-stoichiometric conditions with the addition of thermal energy supplied by a gas which has been heated in at least one plasma generator, the ratio between waste material and oxidant being regulated to give a product gas in which the quotient CO 2 /(CO+CO 2 ) is less than 0.1 and which contains chlorine and/or hydrogen chloride.
Claim 2
Independent Claim
81 words
A method of destroying hazardous waste material which contains chlorinated hydrocarbons comprising incinerating said waste material at a temperature of at least 1200° C. using under-stoichiometric conditions with the addition of thermal energy supplied by a gas which has been heated in at least one plasma generator, the ratio between waste material and oxidant being regulated to give a product gas in which the quotient CO 2 /(CO+CO 2 ) is less than 0.1 and which contains chlorine and/or hydrogen chloride.
Claim 3
Dependent Claim
25 words
A method according to claim 1, wherein the gas in the plasma generator is given an energy density of at least 8 kWh/m 3 (N).
Claim 4
Dependent Claim
12 words
A method according to claim 1, wherein the oxidant consists of air.
Claim 5
Dependent Claim
46 words
A method according to claim 1, wherein after heat-exchanging to a temperature of 350°-700° C., the product gas is introduced into a reactor filled with a chlorine acceptor in order to remove chlorine and/or hydrogen chloride from the gas and to condense any remaining metal vapor.
Claim 6
Dependent Claim
18 words
A method according to claim 4, wherein slaked or quick lime and/or dolomite are utilized as chlorine acceptor.
Claim 7
Dependent Claim
23 words
A method according to claim 1, wherein the gas is caused to pass a reactor filled with carbon-carrier in solid, lump form product.
Claim 8
Dependent Claim
17 words
A method according to claim 6, wherein the reactor filler also includes an additive increasing its reactivity.
Claim 9
Dependent Claim
58 words
A method according to claim 6, wherein the physical heat of the product gas is utilized to heat the carbon-carrier to the temperature of the product gas and the carbon is brought to react with oxygen, carbon dioxide and water vapor in the gas, forming CO and H 2 , to increase the thermal coefficient of the gas.
Claim 10
Dependent Claim
21 words
A method according to claim 7, wherein the additive for increasing the reactivity of the reactor filler is an alkali compound.
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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) | 1989-10-06 | 1990-04-07 | 1990-10-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-10-06 | 1994-04-07 | 1994-10-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-10-06 | 1998-04-07 | 1998-10-07 | $7700.00 | Window Closed / Lapsed |