Patent US3689045A successfully refreshed from Google Patents.
US3689045A
Expired / Lapsed
US
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Pulverized fuel delivery system for a blast furnace
Assignee: Individual
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Filing: 1971-06-03
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Granted: 1972-09-05
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Expires: 1991-06-03
Abstract
Abstract A pulverized fuel delivery system for a blast furnace in which pulverized coal is delivered in dense phase fluidized form into the blast furnace from gas pressurized tanks that are placed in communication, one at a time, in cyclical sequence with a pneumatic transport means. The tank gas pressure is regulated in accordance with the blast furnace wind rate to control the weight flow rate of pulverized coal into the furnace and the transport gas flow rate is regulated in accordance with the fuel weight flow rate to maintain a prescribed transport gas flow rate per pound of coal delivered to the furnace.
Inventors
- 👤 Earl E Coulter
- 👤 Fritz L Hemker
- 👤 Elias A Kazmierski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 21:52
CPC Classifications
C; C21; C21B; C21B5/00; C21B5/001; C21B5/003
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
248 words
A pulverized fuel delivery system for a blast furnace which comprises a pulverizer, a feeder for controlled delivery of raw material to the pulverizer and means for regulating the flow of hot carrier medium to and through the pulverizer, control means coordinating raw material and carrier medium flow to the pulverizer, means for passing the mixture of pulverized fuel and carrier medium from the pulverizer to a separating zone wherein the fuel and carrier medium are separated with the pulverized fuel being discharged into a storage reservoir, a plurality of pressurisable tanks positioned beneath the storage reservoir for gravitational flow of pulverized fuel selectively to the pressureable tanks, means for continuously weighing the pulverized fuel in each of the tanks and the total weight of fuel in the reservoir and the tanks, pneumatic transport means for conveying pulverized fuel from the tanks into the blast furnace, fuel outflow control means connected to each of the tanks and the transport means, said outflow control means being operable to connect the tanks one at a time in predetermined sequence with said transport means to supply same with pulverized fuel, means for pressurizing the tank connected with the transport means in accordance with a condition of said blast furnace to control the rate at which pulverized fuel is delivered into the blast furnace, and control means responsive to the total weight of fuel in the reservoir and tanks to regulate the flow of carrier medium and raw material to the pulverizer.
Claim 2
Dependent Claim
248 words
A pulverized fuel delivery system for a blast furnace which comprises a pulverizer, a feeder for controlled delivery of raw material to the pulverizer and means for regulating the flow of hot carrier medium to and through the pulverizer, control means coordinating raw material and carrier medium flow to the pulverizer, means for passing the mixture of pulverized fuel and carrier medium from the pulverizer to a separating zone wherein the fuel and carrier medium are separated with the pulverized fuel being discharged into a storage reservoir, a plurality of pressurisable tanks positioned beneath the storage reservoir for gravitational flow of pulverized fuel selectively to the pressureable tanks, means for continuously weighing the pulverized fuel in each of the tanks and the total weight of fuel in the reservoir and the tanks, pneumatic transport means for conveying pulverized fuel from the tanks into the blast furnace, fuel outflow control means connected to each of the tanks and the transport means, said outflow control means being operable to connect the tanks one at a time in predetermined sequence with said transport means to supply same with pulverized fuel, means for pressurizing the tank connected with the transport means in accordance with a condition of said blast furnace to control the rate at which pulverized fuel is delivered into the blast furnace, and control means responsive to the total weight of fuel in the reservoir and tanks to regulate the flow of carrier medium and raw material to the pulverizer.
Claim 3
Dependent Claim
70 words
A pulverized fuel delivery system according to claim 1 including means for pressurizing the next tank in said sequence to the same pressure as the tank communicated with said transport means to mInimize discontinuities in the rate at which pulverized fuel is delivered to the blast furnace when the communication of the original tank with said transport means is terminated and said next tank is communicated with the transport means.
Claim 4
Dependent Claim
89 words
A pulverized fuel delivery system according to claim 1 including weighing means for sensing the quantity of pulverized fuel remaining in the tank currently communicated with said transport means and establishing a low fuel weight condition indicator signal whenever such quantity of fuel is below a predetermined amount, and wherein said outflow control means is responsive to said indicator signal to terminate the communication with said transport means of the tank currently supplying pulverized fuel thereto and communicate the next tank in said cyclical sequence with said transport means.
Claim 5
Dependent Claim
75 words
A pulverized fuel delivery system according to claim 1 wherein distributor means connects said reservoir to each of said tanks to gravitationally deliver pulverized fuel from said reservoir to each of said tanks in cyclical sequence, the fuel delivery sequence of said distributor means being in staggered order with respect to the tank-to-transport means communication sequence of said outflow control means so as to supply pulverized fuel to tanks not communicated with said transport means.
Claim 6
Dependent Claim
70 words
A pulverized fuel delivery system according to claim 1 wherein said tank pressurization means includes means for supplying pressurized inert gas to the tank communicated with said transport means, and means for regulating the inert gas pressure inside said tank in accordance with the blast furnace wind rate to maintain a pulverized fuel delivery rate into the blast furnace which is in a predetermined functional relationship to the wind rate.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-09-05 | 1976-03-06 | 1976-09-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-05 | 1980-03-06 | 1980-09-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-05 | 1984-03-06 | 1984-09-05 | $7700.00 | Window Closed / Lapsed |