US4995193A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of preventing adherence of ash to gasifier wall
Assignee: Ube Corp
•
Filing: 1990-07-18
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Granted: 1991-02-26
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Expires: 2010-07-18
Abstract
Abstract A method of preventing the adherence of the ash to a gasifier wall in a process for gasifying petroleum coke in the gasifier by partial oxidization reaction. The petroleum coke is mixed with 10 to 30 wt % of coal based on the petroleum coke and the mixture is gasified at a gasifying temperature higher than the melting point of the ash of said coal.
Inventors
- 👤 Kunio Soga
- 👤 Kazuo Okada
- 👤 Noriaki Tanaka
- 👤 Morio Sogame
- 👤 Toshio Tsujino
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 04:04
CPC Classifications
C; C10; C10J; C10J3/00; C10J3/46; C10J3/466; C10J2300/00; C10J2300/09; C10J2300/0913; C10J2300/093; C10J2300/0943; C10J2300/0953; C10J2300/0959; C10J2300/0973; Y; Y10; Y10S; Y10S48/00; Y10S48/02; Y10S48/07
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
132 words
A method of partially oxidizing petroleum coke and coal while preventing the adherence of the ash to the wall of a gasifier, said method comprising the steps of: pulverizing said petroleum coke and coal; introducing the pulverized petroleum coke, 10 to 30 wt % of coal based on said petroleum coke and oxygen in a smaller amount than the amount necessary for burning said petroleum coke and coal so as to partially gasify said petroleum coke and coal at a temperature higher than the melting point of the ash of said coal; blowing the gas produced during said partially oxidizing step to the water in a quench chamber through a throat and a dip tube in said gasifier; and taking out said gas which has passed through said water of said gasifier.
Claim 2
Independent Claim
132 words
A method of partially oxidizing petroleum coke and coal while preventing the adherence of the ash to the wall of a gasifier, said method comprising the steps of: pulverizing said petroleum coke and coal; introducing the pulverized petroleum coke, 10 to 30 wt % of coal based on said petroleum coke and oxygen in a smaller amount than the amount necessary for burning said petroleum coke and coal so as to partially gasify said petroleum coke and coal at a temperature higher than the melting point of the ash of said coal; blowing the gas produced during said partially oxidizing step to the water in a quench chamber through a throat and a dip tube in said gasifier; and taking out said gas which has passed through said water of said gasifier.
Claim 3
Dependent Claim
32 words
A method according to claim 1, wherein said petroleum coke and said coal are pulverized in a wet process into a slurry and the thus-obtained mixed slurry is supplied to said gasifier.
Claim 4
Dependent Claim
27 words
A method according to claim 1, wherein the partially oxidizing temperature is 30° to 100° C. higher than the melting point of the ash of said coal.
Claim 5
Dependent Claim
34 words
A method according to claim 1, wherein the amount of oxygen used for the partial oxidization is 40 to 60% of the theoretical amount of oxygen required for burning said petroleum coke and coal.
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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) | 1994-02-25 | 1994-08-27 | 1995-02-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-02-25 | 1998-08-27 | 1999-02-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-02-25 | 2002-08-27 | 2003-02-26 | $7700.00 | Window Closed / Lapsed |