US3568764A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat exchanger
Assignee: Individual
•
Filing: 1969-09-05
•
Granted: 1971-03-09
•
Expires: 1989-09-05
Abstract
Abstract A baffle is provided adjacent to the outlet side of the tube sheet of a multiple tube pass heat exchanger. A portion of the input fluid is passed between the baffle and the tube sheet, rather than through the tubes, so that the tube sheet is maintained at a substantially uniform temperature. Ferrules pass the outlet gas portions from the tubes to the outlet chamber of the channel.
Inventors
- 👤 Daniel J Newman
- 👤 Louis A Klein
- 👤 Richard T Britt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 19:15
CPC Classifications
F; F28; F28F; F28F9/00; F28F9/02; F28F9/026; F28F9/0282; F28D; F28D7/00; F28D7/06
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
410 words
An apparatus for exchanging heat between a first fluid and a second fluid by indirect heat exchange which comprises a heat exchanger shell, a tube sheet extending across one end of said shell, a channel disposed about the outer side of said tube sheet and connected to said shell, a partition in said channel, said partition extending to said tube sheet and dividing said channel into a fluid inlet chamber and a fluid outlet chamber, at least one fluid inlet tube, said inlet tube extending into said shell from the portion of said tube sheet adjacent to said fluid inlet chamber, at least one fluid outlet tube, said outlet tube extending from said shell to an opening in the portion of said tube sheet adjacent to said fluid outlet chamber, means to transfer fluid from the discharge end of said fluid inlet tube to the fluid inlet end of said outlet tube, means to pass said first fluid into said inlet chamber, whereby a first portion of said first fluid flows through said inlet tube, said fluid transfer means and said outlet tube, a shield disposed in said fluid outlet chamber, said shield being substantially parallel with and spaced from the portion of said tube sheet adjacent to said fluid outlet chamber, a ferrule, said ferrule being mounted in said shield and extending from said shield into said fluid outlet tube and spaced from the inner tube wall, whereby the first portion of said first fluid discharged from said outlet tube flows through said ferrule and into said fluid outlet chamber, at least one opening provided in said partition between said shield and said tube sheet, whereby a second portion of said first fluid flows through said opening and between said shield and said tube sheet, thereby maintaining the temperature level of the portion of said tube sheet adjacent to said fluid outlet chamber at a temperature level approximately that of the valance of said tube sheet, said second portion of said first fluid thereafter flowing into said fluid outlet chamber to mix with said first portion of said first fluid discharged from said ferrule, means to remove said first fluid from the fluid outlet chamber of said channel, and means to circulate said second fluid through said shell external to said fluid inlet tube and said fluid outlet tube, whereby heat is exchanged between said second fluid and said first portion of said first fluid flowing through said tubes.
Claim 2
Independent Claim
410 words
An apparatus for exchanging heat between a first fluid and a second fluid by indirect heat exchange which comprises a heat exchanger shell, a tube sheet extending across one end of said shell, a channel disposed about the outer side of said tube sheet and connected to said shell, a partition in said channel, said partition extending to said tube sheet and dividing said channel into a fluid inlet chamber and a fluid outlet chamber, at least one fluid inlet tube, said inlet tube extending into said shell from the portion of said tube sheet adjacent to said fluid inlet chamber, at least one fluid outlet tube, said outlet tube extending from said shell to an opening in the portion of said tube sheet adjacent to said fluid outlet chamber, means to transfer fluid from the discharge end of said fluid inlet tube to the fluid inlet end of said outlet tube, means to pass said first fluid into said inlet chamber, whereby a first portion of said first fluid flows through said inlet tube, said fluid transfer means and said outlet tube, a shield disposed in said fluid outlet chamber, said shield being substantially parallel with and spaced from the portion of said tube sheet adjacent to said fluid outlet chamber, a ferrule, said ferrule being mounted in said shield and extending from said shield into said fluid outlet tube and spaced from the inner tube wall, whereby the first portion of said first fluid discharged from said outlet tube flows through said ferrule and into said fluid outlet chamber, at least one opening provided in said partition between said shield and said tube sheet, whereby a second portion of said first fluid flows through said opening and between said shield and said tube sheet, thereby maintaining the temperature level of the portion of said tube sheet adjacent to said fluid outlet chamber at a temperature level approximately that of the valance of said tube sheet, said second portion of said first fluid thereafter flowing into said fluid outlet chamber to mix with said first portion of said first fluid discharged from said ferrule, means to remove said first fluid from the fluid outlet chamber of said channel, and means to circulate said second fluid through said shell external to said fluid inlet tube and said fluid outlet tube, whereby heat is exchanged between said second fluid and said first portion of said first fluid flowing through said tubes.
Claim 3
Dependent Claim
19 words
The apparatus of claim 1, in which the extension of said ferrule within said fluid outlet tube is tapered.
Claim 4
Dependent Claim
39 words
The apparatus of claim 1, in which at least one spacer is provided between said ferrule and said fluid outlet tube, whereby part of said second portion of said first fluid flows between said ferrule and said outlet tube.
Claim 5
Dependent Claim
26 words
The apparatus of claim 1, in which internal insulation is provided on the inner surface of the portion of said channel defining said fluid outlet chamber.
Claim 6
Dependent Claim
20 words
The apparatus of claim 1, in which internal insulation is provided on the inner surface of all of said channel.
Claim 7
Dependent Claim
51 words
The apparatus of claim 1, in which a flange is provided on the outer edge of said shield, said flange extending into said fluid outlet chamber, whereby said second portion of said first fluid is directed parallel to said channel adjacent to the outer joint between said channel and said shell.
Claim 8
Dependent Claim
42 words
The apparatus of claim 1, in which said means to transfer fluid from the discharge end of said fluid inlet tube to the fluid inlet end of said outlet tube is a second channel mounted on the opposed end of said shell.
Claim 9
Dependent Claim
35 words
The apparatus of claim 1, in which said means to transfer fluid from the discharge end of said fluid inlet tube to the fluid inlet end of said outlet tube is a curved tube section.
Claim 10
Dependent Claim
24 words
The apparatus of claim 8, in which said inlet tube, said curved tube section and said outlet tube define a U-tube for heat exchange.
Claim 11
Dependent Claim
36 words
The apparatus of claim 1, in which said first fluid is initially cooler than said second fluid, and said first fluid is heated by indirect heat exchange with said second fluid while flowing through said tubes.
Claim 12
Dependent Claim
13 words
The apparatus of claim 1, in which said first fluid is a gas.
Claim 13
Dependent Claim
46 words
The apparatus of claim 11, in which said gas is the cold tail gas from a nitric acid production process, and said second fluid is a hot gas stream generated by the catalytic combustion of ammonia vapor with air to form a nitrogen oxides-rich gas stream.
References Cited (Backward Citations)
US3001766A
Cited
FR1378640A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-03-08 | 1974-09-07 | 1975-03-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-08 | 1978-09-07 | 1979-03-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-08 | 1982-09-07 | 1983-03-09 | $7700.00 | Window Closed / Lapsed |