US3704690A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High pressure heat exchanger for ammonia gas synthesis plants
Assignee: ThyssenKrupp Industrial Solutions AG
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Filing: 1971-01-21
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Granted: 1972-12-05
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Expires: 1991-01-21
Abstract
Abstract A high pressure heat exchanger particularly useful for ammonia gas synthesis plants in which the hot recycle gas passes through an insulated guide tube and hood and then through a tubesheet having nitriding-resistant central heat exchanger tubes. The gas then reverses its flow to pass through peripheral tubes into the space between the shell and guide hood from which it passes from the exchanger. In the upper part, water is admitted into heat exchanger relation with the gas and the steam resulting passes from the exchanger. Cool outside air is delivered to the space between the guide hood and shell.
Inventors
- 👤 Paul Mevenkamp
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 14:06
CPC Classifications
F; F28; F28F; F28F9/00; C; C01; C01C; C01C1/00; C01C1/02; C01C1/04; C01C1/0405; C01C1/0417; F28D; F28D7/00; F28D7/06; Y; Y02; Y02P; Y02P20/00; Y02P20/50; Y02P20/52
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
148 words
A boiler heated by hot ammonia gas having as additional components H2 and N2 comprising a shell having a gas entrance adjacent one end, a tube sheet extending from an intermediate portion of said shell, a gas guide tube in said gas entrance, a gas hood within said shell spaced from the walls thereof, a nitride-resistant cladding on said tube sheet within the area occupied by said gas hood, a gas-tight connection between said gas hood and said cladding, nitride-resistant central tubes in said tube sheet for the passage of gas from said gas hood, peripheral tubes about said central tubes enabling gas to reverse its direction of flow and pass to the space between said hood and shell, a gas outlet from said space, means to introduce water in the region of said peripheral tubes, and means for removing steam from the region above said tube sheet.
Claim 2
Dependent Claim
148 words
A boiler heated by hot ammonia gas having as additional components H2 and N2 comprising a shell having a gas entrance adjacent one end, a tube sheet extending from an intermediate portion of said shell, a gas guide tube in said gas entrance, a gas hood within said shell spaced from the walls thereof, a nitride-resistant cladding on said tube sheet within the area occupied by said gas hood, a gas-tight connection between said gas hood and said cladding, nitride-resistant central tubes in said tube sheet for the passage of gas from said gas hood, peripheral tubes about said central tubes enabling gas to reverse its direction of flow and pass to the space between said hood and shell, a gas outlet from said space, means to introduce water in the region of said peripheral tubes, and means for removing steam from the region above said tube sheet.
Claim 3
Dependent Claim
23 words
A boiler as claimed in claim 1, comprising means for introducing relatively cold gas into the space between said guide hood and shell.
References Cited (Backward Citations)
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Cited
US2768813A
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US2774575A
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GB1016251A
Cited
US3162177A
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GB1078643A
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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) | 1975-12-05 | 1976-06-05 | 1976-12-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-12-05 | 1980-06-05 | 1980-12-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-12-05 | 1984-06-05 | 1984-12-05 | $7700.00 | Window Closed / Lapsed |