Patent US4433922A successfully refreshed from Google Patents.
US4433922A
Expired / Lapsed
US
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Calorimeter
Assignee: Elsag International BV
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Filing: 1982-07-02
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Granted: 1984-02-28
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Expires: 2002-07-02
Abstract
Abstract A calorimeter and method of obtaining the calorific value of a test gas comprises a pair of constant flow pumps one for supplying air at known volumetric flow and the other for supplying a test gas at known volumetric flow. The known volumetric flow of air is maintained at a level sufficient to provide enough oxygen to fully burn all oxidizable components of the test gas. The air and test gas are mixed and catalytically burned in a heated block and the combustion products are thereafter supplied to an electrochemical oxygen measuring cell which measures the remaining oxygen in the mixture. A circuit arrangement is utilized to obtain a value proportional to the difference between the remaining oxygen and original amount of oxygen which value is proportional to the amount of oxygen utilized and in turn proportional to calorific value of the test gas.
Inventors
- 👤 Thomas L. Bohl
- 👤 Robert E. Pocock
- 👤 Sharon L. Zimmerlin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 09:59
CPC Classifications
G; G01; G01K; G01K7/00; G01N; G01N33/00; G01N33/22; G01N33/225
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
196 words
A calorimeter for the continuous monitoring of the calorific value of a test gas comprising: first constant flow means for supplying a constant known volume of test gas; second constant flow means for supplying a constant known volume of oxygen containing gas having a known oxygen amount which is more than that needed to completely oxidize the test gas; means defining a catalytic burning chamber connected to said first and second flow means for receiving the test and oxygen containing gases and completely catalytically burning the test gas with an amount of oxygen of the oxygen containing to produce a combustion product having residual oxygen therein; heating means for heating the catalytic burning chamber to produce catalytic burning; an electrochemical oxygen measuring cell connected to said chamber for receiving the combustion product and measuring the remaining oxygen in the product; and circuit means connected to said cell for generating a value proportional to the difference between the known volume of oxygen and the amount of remaining oxygen which value is proportional to the amount of oxygen consumed in the combustion chamber, the amount of oxygen consumed being proportional to the calorific value of the test gas.
Claim 2
Dependent Claim
196 words
A calorimeter for the continuous monitoring of the calorific value of a test gas comprising: first constant flow means for supplying a constant known volume of test gas; second constant flow means for supplying a constant known volume of oxygen containing gas having a known oxygen amount which is more than that needed to completely oxidize the test gas; means defining a catalytic burning chamber connected to said first and second flow means for receiving the test and oxygen containing gases and completely catalytically burning the test gas with an amount of oxygen of the oxygen containing to produce a combustion product having residual oxygen therein; heating means for heating the catalytic burning chamber to produce catalytic burning; an electrochemical oxygen measuring cell connected to said chamber for receiving the combustion product and measuring the remaining oxygen in the product; and circuit means connected to said cell for generating a value proportional to the difference between the known volume of oxygen and the amount of remaining oxygen which value is proportional to the amount of oxygen consumed in the combustion chamber, the amount of oxygen consumed being proportional to the calorific value of the test gas.
Claim 3
Dependent Claim
20 words
A calorimeter according to claim 1, wherein said first and second flow means comprise first and second constant flow pumps.
Claim 4
Dependent Claim
16 words
A calorimeter according to claim 2, wherein said first and second pumps comprise reciprocating cylinder pumps.
Claim 5
Dependent Claim
18 words
A calorimeter according to claim 1, wherein said electrochemical oxygen measuring cell comprises a ZrO 2 fuel cell.
Claim 6
Independent Claim
132 words
A method of continuously monitoring the calorific value of a gas comprising: supplying the test gas at a constant known flow rate to a catalytic combustion chamber; supplying an oxygen containing gas to the catalytic burning chamber at a known constant flow rate; heating the catalytic burning chamber to completely burn the test gas to consume an amount of oxygen and produce a combustion product with remaining oxygen therein; measuring the amount of remaining oxygen in a combustion product; and determining the catalytic value of the test gas which is proportional to the amount of oxygen consumed in the catalytic burning chamber which amount of oxygen consumed is proportional to the difference between the known volumetric flow of oxygen into the chamber and the amount of residual oxygen in the combustion product.
Claim 7
Independent Claim
132 words
A method of continuously monitoring the calorific value of a gas comprising: supplying the test gas at a constant known flow rate to a catalytic combustion chamber; supplying an oxygen containing gas to the catalytic burning chamber at a known constant flow rate; heating the catalytic burning chamber to completely burn the test gas to consume an amount of oxygen and produce a combustion product with remaining oxygen therein; measuring the amount of remaining oxygen in a combustion product; and determining the catalytic value of the test gas which is proportional to the amount of oxygen consumed in the catalytic burning chamber which amount of oxygen consumed is proportional to the difference between the known volumetric flow of oxygen into the chamber and the amount of residual oxygen in the combustion product.
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) | 1987-02-27 | 1987-08-29 | 1988-02-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-02-27 | 1991-08-29 | 1992-02-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-02-27 | 1995-08-29 | 1996-02-28 | $7700.00 | Window Closed / Lapsed |