Patent US3673854A successfully refreshed from Google Patents.
US3673854A
Expired / Lapsed
US
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Method of operating gas analysis apparatus
Assignee: Jones and Laughlin Steel Inc
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Filing: 1970-07-22
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Granted: 1972-07-04
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Expires: 1990-07-22
Abstract
Abstract The time required for continuous gas analyzers of blast furnace top gas and the like to reach steady-state conditions after an interruption of furnace operation is greatly reduced by a process including drying the stream of gas analyzed and sealing a gas containing the analyzed constituents within the gas analysis apparatus during the period of interruption.
Inventors
- 👤 Dan Paul Manka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 09:16
CPC Classifications
G; G01; G01N; G01N7/00; G01N7/14; G01N31/00; Y; Y10; Y10T; Y10T436/00; Y10T436/20; Y10T436/204998; Y10T436/205831; Y10T436/22
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
94 words
The method of continuously analyzing off gas from a chemical reaction carried on continuously subject to interruptions, comprising passing it through continuous gas analysis apparatus containing unwanted material which adsorbs a constituent to be analyzed from the off gas and desorbs it to gases not containing that constituent, preventing entrance into the apparatus of gases not containing that constituent, sealing off the gas analysis apparatus from gases not containing that constituent during periods of interruption of the chemical reaction, and again passing the off gas through the gas analysis apparatus when the interruption ceases.
Claim 2
Independent Claim
94 words
The method of continuously analyzing off gas from a chemical reaction carried on continuously subject to interruptions, comprising passing it through continuous gas analysis apparatus containing unwanted material which adsorbs a constituent to be analyzed from the off gas and desorbs it to gases not containing that constituent, preventing entrance into the apparatus of gases not containing that constituent, sealing off the gas analysis apparatus from gases not containing that constituent during periods of interruption of the chemical reaction, and again passing the off gas through the gas analysis apparatus when the interruption ceases.
Claim 3
Dependent Claim
23 words
The method of claim 1 in which the gas analysis apparatus is sealed off by passing therethrough a substitute gas containing that constituent.
Claim 4
Dependent Claim
34 words
The method of claim 1 in which the gas analysis apparatus is sealed off from all external gases so as to maintain within it the identical gas which was present there prior to interruption.
Claim 5
Dependent Claim
41 words
The method of claim 1 in which the off gas is blast furnace top gas, and the gas analysis apparatus is adapted and adjusted to analyze the off gas for at least one of its constituents carbon monoxide and carbon dioxide.
Claim 6
Dependent Claim
60 words
The method of claim 1 in which the off gas is blast furnace top gas, the gas analysis apparatus is adapted and adjusted to analyze the off gas for at least one of its constituents carbon monoxide and carbon dioxide, and for hydrogen, and including the step of drying the off gas before introducing it into the gas analysis apparatus.
Claim 7
Dependent Claim
25 words
The method of claim 5 in which the off gas is dried to a moisture content of not more than about 500 parts per million.
Claim 8
Dependent Claim
26 words
The method of claim 1 in which the unwanted material is fine solid particles carried by the off gas and lodged in the gas analysis apparatus.
Claim 9
Dependent Claim
15 words
The method of claim 7 in which the fine solid particles comprise surface active silica.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-07-04 | 1976-01-03 | 1976-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-04 | 1980-01-03 | 1980-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-04 | 1984-01-03 | 1984-07-04 | $7700.00 | Window Closed / Lapsed |