US4430963A
Expired / Lapsed
US
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System for generating dry coal weight signal for coal feeder and control system based thereon
Assignee: Stock Equipment Co Inc
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Filing: 1982-12-03
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Granted: 1984-02-14
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Expires: 2002-12-03
Abstract
Abstract A system for generating a dry coal weight signal is provided, wherein the moisture content of a coal feed to a solid fuel burner is determined, and the dry coal weight calculated on that basis. Moisture content is determined by measuring density of the coal being fed and/or the torque required to drive a head pulley about which the belt feeding the coal is led at a constant velocity. The dry coal weight signal can be communicated to the drive means, whereby the belt speed is accelerated or decelerated to maintain a constant supply of coal, on a dry weight basis, to the boiler. Also disclosed is a control system employing the dry coal weight signal for a plurality of control functions.
Inventors
- 👤 Alain Finet
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 05:50
CPC Classifications
G; G01; G01G; G01G11/00; G01G11/08; G01G11/12; G05; G05D; G05D7/00; G05D7/06; G05D7/0605; G05D7/0611
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
90 words
A system for generating a dry coal weight signal for a coal feeder comprised of a conveying means and a drive means for driving said conveying means at a selected speed, said system comprising: means for measuring the density of coal being fed by said feeder; means for measuring the torque applied to said drive means; computing means receiving input from said measuring means for computing the dry weight of said coal; and means for communicating said calculated dry weight in the form of a signal to said drive means.
Claim 2
Independent Claim
90 words
A system for generating a dry coal weight signal for a coal feeder comprised of a conveying means and a drive means for driving said conveying means at a selected speed, said system comprising: means for measuring the density of coal being fed by said feeder; means for measuring the torque applied to said drive means; computing means receiving input from said measuring means for computing the dry weight of said coal; and means for communicating said calculated dry weight in the form of a signal to said drive means.
Claim 3
Dependent Claim
29 words
The system of claim 1, wherein said means for measuring density is comprised of a load cell measuring the weight of coal on a given span of said belt.
Claim 4
Dependent Claim
37 words
The system of claim 1, wherein said computing means comprises a means for storing and addressing a plurality of moisture content values as a function of density and drive means torque for the particular coal being fed.
Claim 5
Dependent Claim
20 words
The system of claim 1, wherein said means for measuring torque is comprised of a monitor on said drive means.
Claim 6
Independent Claim
74 words
A system for generating a dry coal weight signal for a coal feeder comprised of endless belt driven at a selected speed by drive means, said system comprising: means for measuring the density of coal being fed by said feeder; computing means receiving input from said measuring means for computing the dry weight of said coal; and means for communicating said calculated dry weight in the form of a signal to said drive means.
Claim 7
Independent Claim
74 words
A system for generating a dry coal weight signal for a coal feeder comprised of endless belt driven at a selected speed by drive means, said system comprising: means for measuring the density of coal being fed by said feeder; computing means receiving input from said measuring means for computing the dry weight of said coal; and means for communicating said calculated dry weight in the form of a signal to said drive means.
Claim 8
Dependent Claim
29 words
The system of claim 5, wherein said means for measuring density is comprised of a load cell measuring the weight of coal on a given span of said belt.
Claim 9
Dependent Claim
33 words
The system of claim 5, wherein said computing means comprises a means for storing and addressing a plurality of moisture content values as a function of density for the particular coal being fed.
Claim 10
Independent Claim
87 words
A system for generating a dry coal weight signal for a coal feeder comprised of a belt and a head pulley on which said belt is driven at a constant speed by rotation of the head pulley by drive means, said system comprising: means for measuring the torque applied to said head pulley; computing means receiving input from said measuring means for computing the dry weight of said coal; and means for communicating said calculated dry weight in the form of a signal to said drive means.
Claim 11
Independent Claim
87 words
A system for generating a dry coal weight signal for a coal feeder comprised of a belt and a head pulley on which said belt is driven at a constant speed by rotation of the head pulley by drive means, said system comprising: means for measuring the torque applied to said head pulley; computing means receiving input from said measuring means for computing the dry weight of said coal; and means for communicating said calculated dry weight in the form of a signal to said drive means.
Claim 12
Dependent Claim
22 words
The system of claim 8, wherein said means for measuring head pulley torque is comprised of a monitor on said drive means.
Claim 13
Dependent Claim
35 words
The system of claim 8, wherein said computing means comprises a means for storing and addressing a plurality of moisture content values as a function of head pulley torque for the particular coal being fed.
Claim 14
Dependent Claim
95 words
In a boiler with a feeder driven by rotation of a head pulley, air flow and a control system having a BTU correction loop to correct for fuel/air imbalances in the boiler, improvement being a dry coal weight signal generating system, said signal generating system comprising: means for determining the moisture content of coal being fed to said boiler; computing means receiving input from said determining means for computing the dry weight of said coal; and means for communicating said computed dry coal weight in the form of a signal to said BTU correction loop.
Claim 15
Dependent Claim
95 words
In a boiler with a feeder driven by rotation of a head pulley, air flow and a control system having a BTU correction loop to correct for fuel/air imbalances in the boiler, improvement being a dry coal weight signal generating system, said signal generating system comprising: means for determining the moisture content of coal being fed to said boiler; computing means receiving input from said determining means for computing the dry weight of said coal; and means for communicating said computed dry coal weight in the form of a signal to said BTU correction loop.
Claim 16
Dependent Claim
36 words
The boiler control system of claim 11, wherein said dry coal weight signal communicated to said BTU correction loop is employed by said correction loop to control and adjust the fuel feed rate of said feeder.
Claim 17
Dependent Claim
35 words
The boiler control system of claim 11, wherein said dry coal weight signal communicated to said BTU correction loop is employed by said correction loop to control and adjust the air flow to said boiler.
Claim 18
Dependent Claim
42 words
The boiler control system of claim 11, wherein said dry coal weight signal communicated to said BTU correction loop is employed by said loop to control and adjust the coal feed rate of said feeder and the air flow to said boiler.
Claim 19
Dependent Claim
36 words
The boiler control system of claim 14, wherein said dry coal weight signal communicated to said BTU correction loop is further employed by said BTU correction loop to calculate the anticipated energy release of said boiler.
Claim 20
Dependent Claim
31 words
The boiler control system of claim 11, wherein said means for determining the moisture content is comprised of a means for measuring the density of coal being fed by said feeder.
Claim 21
Dependent Claim
28 words
The boiler control system of claim 11, wherein said means for determining the moisture content is comprised of means for measuring the torque applied to said head pulley.
Claim 22
Dependent Claim
40 words
The boiler control system of claim 11, wherein said means for determining moisture content is comprised of means for measuring the density of coal being fed by said feeder and a means for measuring the torque applied to said pulley.
Claim 23
Dependent Claim
32 words
The boiler control system of claim 16, wherein said means for measuring coal density is comprised of a load cell measuring the weight of coal on a given span of said feeder.
Claim 24
Dependent Claim
33 words
The boiler control system of claim 17, wherein said means for measuring the torque applied to said head pulley is comprised of a monitor on a drive means connected to said head pulley.
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) | 1987-02-13 | 1987-08-15 | 1988-02-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-02-13 | 1991-08-15 | 1992-02-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-02-13 | 1995-08-15 | 1996-02-14 | $7700.00 | Window Closed / Lapsed |