US4901247A
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Method for controlling an operation of a blast furnace
Assignee: JFE Engineering Corp
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Filing: 1989-08-07
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Granted: 1990-02-13
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Expires: 2009-08-07
Abstract
Abstract A method for operating a blast furnace by inferring the operating conditions in the blast furnace, on the basis of data supplied from sensors set in the blast furnace and also on the basis of the knowledge base formed by experience on the operation of the furnace by a small-scale computer and various processing units provided within the computer. Prior to the inference, the data from the sensors are processed by a large-scale computer and various processing units provided within the large-scale computer. The inference is performed by using certainty factor values, thereby making diagnosis of slip, hanging and channeling.
Inventors
- 👤 Kazumasa Wakimoto
- 👤 Motohiro Shibata
- 👤 Takaharu Ishii
- 👤 Masaaki Sakurai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 07:25
CPC Classifications
G; G05; G05B; G05B23/00; G05B23/02; G05B23/0205; G05B23/0218; G05B23/0243; C; C21; C21B; C21B5/00; C21B5/006; G05B13/00; G05B13/02; G05B13/0265; G05B13/028; G05B23/0259; G05B23/0286; G05B23/0289; Y; Y10; Y10S; Y10S706/00; Y10S706/902; Y10S706/903; Y10S706/906
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
167 words
A method for preventing channeling, slip and hanging in a blast furnace, comprising the steps of: measuring a burden-descent speed by a first sensor means; measuring an in-furnace pressure by a second sensor means; measuring a burden temperature by a third sensor means; measuring an in-furnace gas temperature by a fourth sensor means; measuring a composition of an in-furnace gas by a fifth sensor means; measuring a pressure of a blast gas blown in through tuyeres set in the blast furnace by a sixth sensor means; storing first data from the first to sixth sensor means; processing said first data, and preparing second data corresponding to the conditions of the channeling, slip and hanging in the blast furnace; preparing true-and-false data, as third data, by comparing said second data with standard data; inferring conditions of channeling, slip and hanging, from the third data and from a knowledge base formed by accumulated experience on an operation of the blast furnace; and repeating the above-mentioned steps at predetermined intervals.
Claim 2
Independent Claim
167 words
A method for preventing channeling, slip and hanging in a blast furnace, comprising the steps of: measuring a burden-descent speed by a first sensor means; measuring an in-furnace pressure by a second sensor means; measuring a burden temperature by a third sensor means; measuring an in-furnace gas temperature by a fourth sensor means; measuring a composition of an in-furnace gas by a fifth sensor means; measuring a pressure of a blast gas blown in through tuyeres set in the blast furnace by a sixth sensor means; storing first data from the first to sixth sensor means; processing said first data, and preparing second data corresponding to the conditions of the channeling, slip and hanging in the blast furnace; preparing true-and-false data, as third data, by comparing said second data with standard data; inferring conditions of channeling, slip and hanging, from the third data and from a knowledge base formed by accumulated experience on an operation of the blast furnace; and repeating the above-mentioned steps at predetermined intervals.
Claim 3
Dependent Claim
14 words
The method according to claim 1, wherein said predetermined intervals are about two minutes.
Claim 4
Dependent Claim
40 words
A method according to claim 1, wherein said step of inferring comprises a step of processing the true-and-false data, in consideration of a CF value corresponding to an individual item of the true-and-false data, to prepare a total judgement datum.
Claim 5
Dependent Claim
68 words
A method according to claim 1, wherein said step of processing the first data includes at least one selected from the following processings: calculating a rate of change within a designated time interval; calculating an integral value within a designated time interval; calculating dispersion of values within a designated time interval; and calculating a balance between a value measured at a present time and a value measured before.
Claim 6
Dependent Claim
42 words
A method according to claim 1, wherein said second data includes at least one selected from the following: data representing burden-descent behavior; data representing in-furnace pressure loss; data representing in-furnace temperature; data representing composition of in-furnace gas; and data representing residual slag.
Claim 7
Dependent Claim
35 words
A method according to claim 5, wherein said data representing burden descent behavior includes at least one selected from the following: burden-descent speed; dispersion of burden-descent speed; delay of burden-descent; and average of burden-descent speeds.
Claim 8
Dependent Claim
42 words
A method according to claim 5, wherein said data representing in-furnace pressure loss includes at least one selected from the following: in-furnace pressure loss; average of in-furnace pressure losses; dispersion of in-furnace pressure losses; and average of shaft pressures in stable operation.
Claim 9
Dependent Claim
56 words
A method according to claim 5, wherein said data representing in-furnace temperature includes at least one selected from the following: rise of shaft temperature; average of shaft temperatures in stable operation; rise of burden temperature, measured by horizontal probes set in a shaft; and average of burden temperatures in stable operation, measured by the horizontal probes.
Claim 10
Dependent Claim
31 words
A method according to claim 5, wherein said data representing gas composition includes at least one of a drop of a gas utilization ratio and the drop of gas utilization amount.
Claim 11
Dependent Claim
70 words
A method according to claim 5, wherein said data representing residual slag includes at least one selected from the following: a fall of temperature of the in-furnace central area at a furnace-throat level, measured by under-bell probes; a rise of in-furnace temperature of the periphery area at a furnace-throat level, measured by under-bell probes; a rise of shaft pressure; a rise of blast pressure; and an amount of residual slag.
Claim 12
Dependent Claim
45 words
A method according to claim 1, wherein said knowledge base comprises at least one selected from the following: a rule for burden-descent; a rule for in-furnace pressure loss; a rule for in-furnace temperature; a rule for in-furnace gas constituent; and a rule for residual slag.
Claim 13
Dependent Claim
168 words
A method according to claim 1, wherein said step of inferring comprises the steps of: producing true-and-false data, in consideration of a certainty factor (CF) value corresponding to an individual item of the true-and-false data, to prepare at least one item of data constituting fourth data, selected from the following: data showing levels of burden descent; data showing levels of in-furnace pressure dispersion; data showing levels of in-furnace temperature dispersion; data showing levels of gas utilization ratio; data showing levels of amount of residual slag by sensor judgement; and data showing levels of amount of residual slag by human judgement; processing said fourth data, in consideration of a CF value corresponding to an individual item of said fourth data, to prepare fifth data including data obtained by sensor judgement and data obtained by human judgement; and processing said fifth data and a datum of a previous alarm, in consideration of a CF value corresponding to an individual item of the fifth data, to prepare a total judgement datum.
Claim 14
Dependent Claim
129 words
A method according to claim 1, wherein said step of inferring comprises the steps of: processing the true-and-false data, in consideration of a CF value corresponding to an individual datum of the true-and-false data, to prepare at least one item of data constituting fourth data, selected from the following: data showing levels of burden descent; data showing level of in-furnace pressure dispersion; data showing levels of in-furnace temperature dispersion; data showing levels of gas utilization ratio; data showing levels of amount of residual slag by sensor judgement; and data showing levels of residual slag by human judgement; processing said fourth data and a datum of a previous alarm, in consideration of a CF value corresponding to an individual item of said fourth data, to prepare a total judgement datum.
Claim 15
Dependent Claim
28 words
A method according to claim 1, which further comprises the step of controlling an operating condition of the blast furnace in accordance with results of the inferring step.
Claim 16
Dependent Claim
34 words
A method according to claim 14, wherein said step of controlling an operating condition of the blast furnace comprises reducing a blast blown into the blast furnace through tuyeres set in the blast furnace.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1993-02-12 | 1993-08-14 | 1994-02-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-02-12 | 1997-08-14 | 1998-02-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-02-12 | 2001-08-14 | 2002-02-13 | $7700.00 | Window Closed / Lapsed |