US3630850A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cracking furnace with burners engaging mirror image coiled tubes
Assignee: Shell USA Inc
•
Filing: 1969-08-04
•
Granted: 1971-12-28
•
Expires: 1989-08-04
Abstract
Abstract A cracking furnace for carrying out chemical reactions wherein the furnace is a closed chamber having a top bottom and at least two relatively smooth vertical parallel walls. A plurality of vertically extending hollow tubes for carrying a medium therethrough are disposed in the chamber, an odd number of the tubes forming a coil with all of the tubes in one coil being joined to adjacent tubes in the same coil. The coils include inlet and outlet openings, the inlet openings being on one side of the chamber and the outlet openings on the other. At least two coils are adjacent in such a manner that one is the mirror image of the other. Burner means operatively engages the inlet openings and a combustion gas outlet in the chamber is in communication with the outlet openings.
Inventors
- 👤 Wilhelmus R Dorresteyn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 15:50
CPC Classifications
B; B01; B01J; B01J19/00; B01J19/24; B01J19/2415; B01J19/2425; C; C10; C10G; C10G9/00; C10G9/14; C10G9/18; C10G9/20; B01J2219/00; B01J2219/00049; B01J2219/00051; B01J2219/00074; B01J2219/00087; B01J2219/00103; B01J2219/00157; B01J2219/00159
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
34 words
The furnace of claim 1 wherein the distances between adjacent tubes of one coil increases along the route from the tube with the outlet opening, therein to the tube with the inlet opening therein.
Claim 2
Dependent Claim
12 words
The furnace of claim 1 wherein each coil consists of three tubes.
Claim 3
Dependent Claim
32 words
The furnace of claim 1 wherein all of said coils are located in one level plane, which plane is located between and at equal distances from said vertical sidewalls of the chamber.
Claim 4
Dependent Claim
49 words
The furnace of claim 1 wherein said burner means includes a burner associated with each inlet opening, each burner having the same capacity and being arranged in pairs, the two burners of one pair being arranged symmetrically relative to the set of adjacent inlet openings of two adjacent coils.
Claim 5
Dependent Claim
46 words
The furnace of claim 1 wherein the coils are arranged in at least two level planes that are parallel to each other and to said vertical sidewalls of the chamber, in such a way that in each plane the same even number of coils are present.
Claim 6
Dependent Claim
118 words
The furnace of claim 6 wherein said burner means includes a burner associated with each inlet opening, each burner being arranged in at least one group of at least three burners so that the burners of one group are located on a line that is perpendicular to the level planes of the coils and that runs symmetrically between the adjacent inlet openings of two coils located in one plane, in such a way that one burner is always present between a vertical sidewall and the nearby inlet openings and one burner is present between two planes containing coils, the burners present between the planes containing coils having a larger capacity than the burners present adjacent a vertical sidewall.
Claim 7
Dependent Claim
27 words
The furnace of claim 7 wherein the ratio between the capacities of said burners present between said planes to the other of said burners is approximately 2:1.
Claim 8
Dependent Claim
15 words
The furnace of claim 1 wherein said burner means produce flames of relatively low luminosity.
Claim 9
Dependent Claim
15 words
The furnace of claim 9 wherein said burner means are of the multiple vortex type.
Claim 10
Dependent Claim
45 words
The apparatus of claim 1 wherein the burner means is located in relation to at least two of said coils so that the second and following tubes of each coil, counting from the tube with the inlet opening, are farther removed from said burner means.
Claim 11
Dependent Claim
20 words
The apparatus of claim 1 including preheater means adapted to preheat the medium with combustion gas from the furnace chamber.
References Cited (Backward Citations)
US3215502A
Cited
US3407789A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-12-27 | 1975-06-28 | 1975-12-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-27 | 1979-06-28 | 1979-12-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-27 | 1983-06-28 | 1983-12-28 | $7700.00 | Window Closed / Lapsed |