US3720351A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pulverized fuel delivery system for a blast furnace
Assignee: Babcock International Ltd
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Filing: 1971-05-06
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Granted: 1973-03-13
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Expires: 1991-05-06
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
- 👤 E Coulter
- 👤 F Hemker
- 👤 E Kazmierski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 16:15
CPC Classifications
F; F24; F24F; F24F13/00; C; C21; C21B; C21B5/00; C21B5/001; C21B5/003; F23; F23K; F23K3/00; F23K2203/00; F23K2203/006
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
73 words
A method of supplying pulverized fuel to a blast furnace which comprises introducing a quantity of pulverized fuel into a tank, pressurizing the tank with a gas, communicating the tank with the furnace to allow flow of pulverized fuel thereto under the influence of the gas pressure in the tank, and adjusting said gas pressure in accordance with a condition of the furnace to correspondingly regulate the flow rate or pulverized fuel thereto.
Claim 2
Independent Claim
73 words
A method of supplying pulverized fuel to a blast furnace which comprises introducing a quantity of pulverized fuel into a tank, pressurizing the tank with a gas, communicating the tank with the furnace to allow flow of pulverized fuel thereto under the influence of the gas pressure in the tank, and adjusting said gas pressure in accordance with a condition of the furnace to correspondingly regulate the flow rate or pulverized fuel thereto.
Claim 3
Independent Claim
73 words
A method of supplying pulverized fuel to a blast furnace which comprises introducing a quantity of pulverized fuel into a tank, pressurizing the tank with a gas, communicating the tank with the furnace to allow flow of pulverized fuel thereto under the influence of the gas pressure in the tank, and adjusting said gas pressure in accordance with a condition of the furnace to correspondingly regulate the flow rate or pulverized fuel thereto.
Claim 4
Independent Claim
73 words
A method of supplying pulverized fuel to a blast furnace which comprises introducing a quantity of pulverized fuel into a tank, pressurizing the tank with a gas, communicating the tank with the furnace to allow flow of pulverized fuel thereto under the influence of the gas pressure in the tank, and adjusting said gas pressure in accordance with a condition of the furnace to correspondingly regulate the flow rate or pulverized fuel thereto.
Claim 5
Dependent Claim
26 words
A method according to claim 1 wherein said tank gas pressure is adjusted in accordance with the flow rate of combustion air to the blast furnace.
Claim 6
Dependent Claim
41 words
A method according to claim 2 wherein said tank is communicated with the furnace through a conduit and including the step of introducing a carrier gas under pressure into said conduit to pneumatically convey said pulverized fuel therethrough into the furnace.
Claim 7
Dependent Claim
52 words
A method according to claim 3 including the step of adjusting the flow rate of said carrier gas into the conduit in accordance with flow rate of pulverized fuel out of said tank to maintain a given carrier gas flow rate per weight unit of pulverized fuel delivered into the blast furnace.
Claim 8
Dependent Claim
63 words
A method according to claim 1 including the steps of sensing the weight of said tank to determine the delivery rate of pulverized fuel into the furnace, converting raw fuel into pulverized fuel at a rate equal to said delivery rate, and storing the pulverized fuel resulting from such conversion for subsequent transfer into said tank to replenish the pulverized fuel supply thereof.
Claim 9
Dependent Claim
138 words
In a method of supplying pulverized coal to a blast furnace having a plurality of pressurizable tanks for holding pulverized fuel, a conduit communicating with the blast furnace, and means for selectively communicating each of said tanks with said conduit, a method of supplying pulverized fuel to the blast furnace which comprises the steps of communicating said tanks, one at a time in a predetermined sequence, with said conduit, pressurizing with a gas the tank currently communicated with the conduit to effect flow of pulverized fuel from that tank into the conduit, introducing a carrier gas under pressure into said conduit to pneumatically convey said pulverized fuel therethrough into the blast furnace, and adjusting the gas pressure in said communicated tank in accordance with a condition of the furnace to correspondingly regulate the flow of pulverized fuel thereto.
Claim 10
Dependent Claim
138 words
In a method of supplying pulverized coal to a blast furnace having a plurality of pressurizable tanks for holding pulverized fuel, a conduit communicating with the blast furnace, and means for selectively communicating each of said tanks with said conduit, a method of supplying pulverized fuel to the blast furnace which comprises the steps of communicating said tanks, one at a time in a predetermined sequence, with said conduit, pressurizing with a gas the tank currently communicated with the conduit to effect flow of pulverized fuel from that tank into the conduit, introducing a carrier gas under pressure into said conduit to pneumatically convey said pulverized fuel therethrough into the blast furnace, and adjusting the gas pressure in said communicated tank in accordance with a condition of the furnace to correspondingly regulate the flow of pulverized fuel thereto.
Claim 11
Dependent Claim
51 words
A method according to claim 6 including the steps of pressurizing with a gas the next tank in said sequence to be communicated with said conduit and adjusting the gas pressure in said next tank to maintain such gas pressure equal to that in the tank currently communicated with the conduit.
Claim 12
Dependent Claim
54 words
A method according to claim 6 including the step of adjusting the flow rate of said carrier gas into the conduit in accordance with the flow rate of pulverized fuel out of said communicated tank to maintain a given carrier gas flow rate per weight unit of pulverized fuel delivered into the blast furnace.
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) | 1976-03-12 | 1976-09-11 | 1977-03-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-12 | 1980-09-11 | 1981-03-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-12 | 1984-09-11 | 1985-03-13 | $7700.00 | Window Closed / Lapsed |