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US4397267A Expired / Lapsed US ⏱️ 0.0 years remaining

Technique and apparatus for solids circulation control in the solids circulating boiler

Assignee: Consolidation Coal Co
•
Filing: 1981-08-03
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Granted: 1983-08-09
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Expires: 2001-08-03
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Abstract

Abstract A method and apparatus for controlling steam production by controlling the flow rate of particulate solids from a fluidized bed combustion chamber through a vertical heat exchanger. The pressure drop across a section of the vertical heat exchanger is monitored and compared with a set point pressure drop. When the pressure drop being monitored falls below the set point pressure drop, a signal is provided to a particulate solids feed control means which then allows more particulate solids to be circulated through the vertical heat exchanger. The vertical heat exchanger receives heat from the particulate solids. The additional amount of particulate solids fed to the vertical heat exchanger are recirculated along with the previous amount of particulate solids through the heat exchanger into the fluidized bed combustion chamber. Because of the additional cooled particulate solids in the fluidized bed combustion chamber the temperature of the fluidized bed combustion chamber drops. The temperature of the fluidized bed combustion chamber is monitored by temperature sensor when the temperature in the fluidized bed combustion chamber drops, a signal is provided to the fuel feed control means which provides additional fuel to the fluidized bed to provide additional heat to make up for the additional cooling in the vertical heat exchanger of the additional particulate solids.

Inventors

  • 👤 Carl E. Fink

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-31 19:21
CPC Classifications
F; F22; F22B; F22B31/00; F22B31/0007; F22B31/0084

Claims Analysis

Total Claims: 7
Claim 1
Independent Claim 124 words
In a fluidized bed heat exchanger wherein particulate solids are circulated from a fluidized-bed combustion zone by way of a flow-control zone upwardly through an elongated vertically disposed heat exchange zone and thence back to said combustion zone, the method of controlling the rate of circulation of said particulate solids which comprises: measuring the pressure differential between two points along said heat exchange zone, comparing the measured value of said differential to a predetermined reference value, generating a control signal responsive to said comparing, and utilizing said control signal to permit increased flow of said particulate solids through said flow control zone responsive to a decrease in said pressure differential and a decreased flow of said solids responsive to an increase in said differential.
Claim 2
Dependent Claim 124 words
In a fluidized bed heat exchanger wherein particulate solids are circulated from a fluidized-bed combustion zone by way of a flow-control zone upwardly through an elongated vertically disposed heat exchange zone and thence back to said combustion zone, the method of controlling the rate of circulation of said particulate solids which comprises: measuring the pressure differential between two points along said heat exchange zone, comparing the measured value of said differential to a predetermined reference value, generating a control signal responsive to said comparing, and utilizing said control signal to permit increased flow of said particulate solids through said flow control zone responsive to a decrease in said pressure differential and a decreased flow of said solids responsive to an increase in said differential.
Claim 3
Dependent Claim 53 words
The method of claim 1 further characterized by measuring the temperature at a location within said combustion chamber, comparing said temperature to a predetermined temperature value to produce a control signal representative of temperature difference, and utilizing said latter control signal to adjust the rate of addition of fuel to said combustion zone.
Claim 4
Independent Claim 71 words
An apparatus for controlling the flow rate of particulate solids to a heat exchanger from a fluidized bed combustion chamber comprising, a fluidized bed combustion chamber, a heat exchange means, a differential pressure sensing means connected to said heat exchange means, means for passing particulate solids from said chamber to said heat exchange means, and control means responsive to said sensing means adapted to regulate said means for passing particulate solids.
Claim 5
Independent Claim 71 words
An apparatus for controlling the flow rate of particulate solids to a heat exchanger from a fluidized bed combustion chamber comprising, a fluidized bed combustion chamber, a heat exchange means, a differential pressure sensing means connected to said heat exchange means, means for passing particulate solids from said chamber to said heat exchange means, and control means responsive to said sensing means adapted to regulate said means for passing particulate solids.
Claim 6
Dependent Claim 17 words
The apparatus of claim 3 wherein said differential pressure sensing means comprises a differential pressure transmitter means.
Claim 7
Dependent Claim 41 words
The apparatus of claim 4 wherein said differential pressure sensing means further comprises an upper pressure sensor and a lower pressure sensor, said upper pressure sensor and said lower pressure sensor each providing a signal to said differential pressure transmitter means.

References Cited (Backward Citations)

US3921590A Cited
US4240377A Cited
US4335683A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1986-08-08 1987-02-07 1987-08-09 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1990-08-08 1991-02-07 1991-08-09 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1994-08-08 1995-02-07 1995-08-09 $7700.00 Window Closed / Lapsed

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