US2978378A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for cleaning heat exchange apparatus connected to receive flue gases from soda recovery-boilers
Assignee: A Ekstroms Maskinaffar AB
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Filing: 1958-11-18
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Granted: 1961-04-04
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Expires: 1978-11-18
Abstract
No abstract record available.
Inventors
- 👤 Hult Nils Ragnar Rafael
- 👤 Broman Bror Olof
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 06:53
CPC Classifications
F; F28; F28G; F28G9/00; F23; F23J; F23J3/00; F23J3/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
105 words
IN THE OPERATION OF A SODA RECOVERY-BOILER FROM WHICH DUST-LADEN FLUE GASES GENERATED BY COMBUSTION BLACK LIQUOR IN THE BOILER FURNANCE ARE CONDUCTEC THROUGH HEAT EXCHANGE APPARATUS THE GAS-SWEPT HEAT-TRANSMISSION SURFACES OF WHICH ARE CLEANED DURING OPERATION BY INTRODUCING STEEL SHOT INTO A SPACE ABOVE SAID HEAT EXCHANGE APPARATUS, SAID STEEL SHOT BEING SCATTERED AND ALLOWED TO DROP AGAINST SAID HEAT-TRANSMISSION SURFACES TO REMOVE THEREFROM DEPOSITS FORMED THEREON BY THE DUST UPON THE PASSAGE OF SAID FLUE GASES THROUGH SAID HEAT EXCHANGE APPARATUS, THE STEP WHICH COMPRISES ADDING TO THE FLUE GAS STREAM AFTER SAID BOILER AND BEFORE SAID HEAT EXCHANGE APPARATUS PARTICLES OF SALT-CAKE.
Claim 2
Dependent Claim
105 words
IN THE OPERATION OF A SODA RECOVERY-BOILER FROM WHICH DUST-LADEN FLUE GASES GENERATED BY COMBUSTION BLACK LIQUOR IN THE BOILER FURNANCE ARE CONDUCTEC THROUGH HEAT EXCHANGE APPARATUS THE GAS-SWEPT HEAT-TRANSMISSION SURFACES OF WHICH ARE CLEANED DURING OPERATION BY INTRODUCING STEEL SHOT INTO A SPACE ABOVE SAID HEAT EXCHANGE APPARATUS, SAID STEEL SHOT BEING SCATTERED AND ALLOWED TO DROP AGAINST SAID HEAT-TRANSMISSION SURFACES TO REMOVE THEREFROM DEPOSITS FORMED THEREON BY THE DUST UPON THE PASSAGE OF SAID FLUE GASES THROUGH SAID HEAT EXCHANGE APPARATUS, THE STEP WHICH COMPRISES ADDING TO THE FLUE GAS STREAM AFTER SAID BOILER AND BEFORE SAID HEAT EXCHANGE APPARATUS PARTICLES OF SALT-CAKE.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-04-03 | 1964-10-03 | 1965-04-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-04-03 | 1968-10-03 | 1969-04-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-04-03 | 1972-10-03 | 1973-04-04 | $7700.00 | Window Closed / Lapsed |