Patent US3377960A successfully refreshed from Google Patents.
Patent US4198212A successfully refreshed from Google Patents.
US4198212A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coal gasification effluent treatment
Assignee: Lummus Technology LLC
•
Filing: 1978-08-17
•
Granted: 1980-04-15
•
Expires: 1998-08-17
Abstract
Abstract Coal is gasified to produce a coal gasification effluent and a char residue. The char residue is cooled by indirect heat transfer in a char bed, and the coal gasification effluent is passed through the cool char bed to effect cooling of the coal gasification effluent, with tars and oil present in the effluent being absorbed by the char bed. In this manner, the gasification effluent is cooled without fouling of heat transfer surfaces, and tars and oils are effectively removed therefrom.
Inventors
- 👤 Utah Tsao
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 18:42
CPC Classifications
C; C10; C10J; C10J3/00; C10J3/72; C10J3/82; C10J3/84; C10B; C10B49/00; C10B49/02; C10B49/04; C10B49/08; C10B49/10; C10J3/46; C10J3/48; C10J3/482; C10J3/54; C10J3/78; C10J2300/00; C10J2300/09; C10J2300/0913; C10J2300/093; C10J2300/0953; C10J2300/0959; C10J2300/0973; C10J2300/0976; C10J2300/18; C10J2300/1807; C10J2300/1861; C10J2300/1884; C10J2300/1892
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
170 words
In a process for the gasification of coal in a coal gasification zone to produce a solid char residue and a coal gasification effluent containing tar and oils, the improvements comprising: separately withdrawing said char and said coal gasification effluent from said coal gasification zone; suspending said withdrawn char in said withdrawn coal gasification effluent; passing said char suspended in said gasification effluent into a fluidized char bed maintained in a char cooling zone; cooling and maintaining char in said bed at a temperature of from 220° F. to 600° F. by indirect heat transfer, whereby said coal gasification effluent, containing tar and oils, passing through said cooled char bed is cooled and tar and oils are separated therefrom by absorbing the tar and oils on said char bed; and removing cooled char from the coal gasification process without recycle of any cooled char to the coal gasification zone by withdrawing cooled char from said char bed, whereby char produced in the coal gasification is cooled prior to removal thereof.
Claim 2
Dependent Claim
170 words
In a process for the gasification of coal in a coal gasification zone to produce a solid char residue and a coal gasification effluent containing tar and oils, the improvements comprising: separately withdrawing said char and said coal gasification effluent from said coal gasification zone; suspending said withdrawn char in said withdrawn coal gasification effluent; passing said char suspended in said gasification effluent into a fluidized char bed maintained in a char cooling zone; cooling and maintaining char in said bed at a temperature of from 220° F. to 600° F. by indirect heat transfer, whereby said coal gasification effluent, containing tar and oils, passing through said cooled char bed is cooled and tar and oils are separated therefrom by absorbing the tar and oils on said char bed; and removing cooled char from the coal gasification process without recycle of any cooled char to the coal gasification zone by withdrawing cooled char from said char bed, whereby char produced in the coal gasification is cooled prior to removal thereof.
Claim 3
Dependent Claim
23 words
The process of claim 1 wherein the char bed is cooled and maintained at a temperature of from 300° F. to 500° F.
Claim 4
Dependent Claim
26 words
The process of claim 2 wherein the char is steam stripped prior to withdrawal from the char cooling zone to strip entrained gases from the char.
Claim 5
Dependent Claim
16 words
The process of claim 3 wherein the withdrawn char is employed as fuel in a boiler.
Claim 6
Dependent Claim
17 words
The process of claim 2 wherein the coal gasification zone is a fluidized coal bed gasification reactor.
Claim 7
Dependent Claim
31 words
The process of claim 3 wherein the coal gasification zone is operated at a temperature of from 1200° F. to 2000° F. and a pressure of from 10 to 1500 psig.
Claim 8
Dependent Claim
19 words
The process of claim 6 wherein the char is cooled by indirect heat transfer with water to generate steam.
Claim 9
Dependent Claim
29 words
The process of claim 7 wherein the steam is generated at a temperature of from 280° F. to 550° F. and a pressure of from 35 to 1035 psig.
References Cited (Backward Citations)
US2689787A
Cited
US2687950A
Cited
US2591595A
Cited
US3817723A
Cited
US3852048A
Cited
US3991557A
Cited
US4049570A
Cited
DE2541574A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-04-15 | 1983-10-15 | 1984-04-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-04-15 | 1987-10-15 | 1988-04-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-04-15 | 1991-10-15 | 1992-04-15 | $7700.00 | Window Closed / Lapsed |