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US4498338A
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Procedure and means for measuring the coal content in quick ash
Assignee: Kajaani Oy
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Filing: 1983-01-26
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Granted: 1985-02-12
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Expires: 2003-01-26
Abstract
Abstract A procedure and an apparatus for continuously measuring the coal content of quick ash, ash being fed through a measuring chamber (1), through between measuring capacitor plates (2), the change of capacitance caused by the coal being measured, and a measuring signal being formed which characterizes the coal content of the ash.
Inventors
- 👤 Eero Peltonen
- 👤 Aarni Somerikko
- 👤 Timo Viitanen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 08:59
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/02; G01N27/22
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
56 words
A method for measuring the coal content of quick ash, comprising the steps of feeding quick ash containing uncombusted coal particles into an electric field established by a pair of spaced electrodes of a capacitor, measuring the change in capacitance of the capacitor, and generating a measuring signal which indicates the coal content of said ash.
Claim 2
Independent Claim
56 words
A method for measuring the coal content of quick ash, comprising the steps of feeding quick ash containing uncombusted coal particles into an electric field established by a pair of spaced electrodes of a capacitor, measuring the change in capacitance of the capacitor, and generating a measuring signal which indicates the coal content of said ash.
Claim 3
Dependent Claim
23 words
The method of claim 1 and including the step of maintaining the density of the ash substantially constant during measuring of said capacitance.
Claim 4
Dependent Claim
20 words
The method of claim 1 wherein said step of feeding comprises continually passing the quick ash through said electrical field.
Claim 5
Dependent Claim
27 words
The method of claim 1 wherein the step of feeding the ash into said electrical field takes place periodically with the length of the period being adjustable.
Claim 6
Dependent Claim
20 words
The method of claim 1 and including the step of vibrating the ash to maintain uniform density of said ash.
Claim 7
Independent Claim
99 words
A method for measuring the coal content of quick ash, comprising the steps of continuously feeding quick ash containing uncombusted coal particles into a measuring chamber containing an electric field established by spaced electrodes of a capacitor, measuring the capacitance of the ash being fed through said chamber, generating a measuring signal indicating the coal content of the ash, comparing the measuring signal to a reference signal to generate an output signal proportional to the difference between the measuring signal and a reference signal, and utilizing the output signal to control the feed of ash into said measuring chamber.
Claim 8
Independent Claim
99 words
A method for measuring the coal content of quick ash, comprising the steps of continuously feeding quick ash containing uncombusted coal particles into a measuring chamber containing an electric field established by spaced electrodes of a capacitor, measuring the capacitance of the ash being fed through said chamber, generating a measuring signal indicating the coal content of the ash, comparing the measuring signal to a reference signal to generate an output signal proportional to the difference between the measuring signal and a reference signal, and utilizing the output signal to control the feed of ash into said measuring chamber.
Claim 9
Independent Claim
65 words
An apparatus for measuring the coal content of quick ash, comprising a measuring chamber, a capacitor disposed in the measuring chamber and including a pair of spaced electrodes, means for continuously feeding quick ash containing uncombusted coal particles through said measuring chamber, means for measuring the capacitance of the ash and generating a measuring signal proportionate to the content of coal particles in said ash.
Claim 10
Independent Claim
65 words
An apparatus for measuring the coal content of quick ash, comprising a measuring chamber, a capacitor disposed in the measuring chamber and including a pair of spaced electrodes, means for continuously feeding quick ash containing uncombusted coal particles through said measuring chamber, means for measuring the capacitance of the ash and generating a measuring signal proportionate to the content of coal particles in said ash.
Claim 11
Dependent Claim
22 words
The apparatus of claim 7 and including means for maintaining the ash passing through said measuring chamber at a relatively constant density.
Claim 12
Dependent Claim
30 words
The apparatus of claim 8 wherein each electrode includes a series of fingers interlaced with the fingers of the other electrode, said ash flowing through the space between the fingers.
Claim 13
Dependent Claim
39 words
The apparatus of claim 7 wherein said measuring chamber is disposed substantially vertically, and said apparatus includes discharge conveyor means connected to the lower end of said measuring chamber for removing ash from the lower end of said chamber.
Claim 14
Dependent Claim
26 words
The apparatus of claim 7 and including vibrator means for vibrating the ash flowing through the chamber to maintain a substantially constant density for said ash.
Claim 15
Dependent Claim
39 words
The apparatus of claim 7 and including weighing means for determining the weight of the ash in the measuring chamber, and compensating means for correcting the measuring signal in accordance with the difference in weight from a reference weight.
Claim 16
Dependent Claim
23 words
The apparatus of claim 7 wherein the capacitor comprises a pair of electrodes which are substantially planar and between which the ash flows.
Claim 17
Dependent Claim
44 words
The apparatus of claim 7 wherein the capacitor comprises a pair of electrodes, one of said electrodes being annular at least in part and the second of said electrodes being disposed centrally with reference to said annular electrode, said ash flowing between said electrodes.
References Cited (Backward Citations)
DE2235037A1
Cited
DE2412165A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-02-12 | 1988-08-13 | 1989-02-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-02-12 | 1992-08-13 | 1993-02-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-02-12 | 1996-08-13 | 1997-02-12 | $7700.00 | Window Closed / Lapsed |