EP0181245B1 - Procédé et installation pour le contrôle en continu des hauts-fourneaux - Google Patents

Procédé et installation pour le contrôle en continu des hauts-fourneaux Download PDF

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Publication number
EP0181245B1
EP0181245B1 EP85401963A EP85401963A EP0181245B1 EP 0181245 B1 EP0181245 B1 EP 0181245B1 EP 85401963 A EP85401963 A EP 85401963A EP 85401963 A EP85401963 A EP 85401963A EP 0181245 B1 EP0181245 B1 EP 0181245B1
Authority
EP
European Patent Office
Prior art keywords
sampling
analysis
gas
orifice
operations
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
EP85401963A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0181245A1 (fr
Inventor
Jean-Louis Lebonvallet
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
USINOR SA
Original Assignee
Union Siderurgique du Nord et de lEst de France SA USINOR
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Union Siderurgique du Nord et de lEst de France SA USINOR filed Critical Union Siderurgique du Nord et de lEst de France SA USINOR
Priority to AT85401963T priority Critical patent/ATE39268T1/de
Publication of EP0181245A1 publication Critical patent/EP0181245A1/fr
Application granted granted Critical
Publication of EP0181245B1 publication Critical patent/EP0181245B1/fr
Expired legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B5/00—Making pig-iron in the blast furnace
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B5/00—Making pig-iron in the blast furnace
    • C21B5/006—Automatically controlling the process

Definitions

  • the present invention relates to methods and installations for controlling the operation of blast furnaces.
  • a process for controlling the operation of a blast furnace according to which gas is taken from several orifices spaced apart on the height of the wall of the blast furnace, characterized in that it is taken these gases successively from said orifices; an analysis is carried out to determine the content of these gases in at least some of their constituents and the pressure of these gases is measured; these operations being repeated periodically over a significant period of operation of the blast furnace.
  • the installation shown schematically in Figure 1 comprises: a blast furnace F in the wall of which is provided a series of sampling orifices (T1, T2, 7) preferably arranged along a generator and at different levels. Preferably, there are between 6 and 10 sampling orifices distributed over the height of the blast furnace. In the embodiment described and represented in the drawing, these orifices are divided into two categories, the orifices of even rank (T2, T4, ...) and the orifices of odd rank (T1, T3 ).
  • the diagram in Figure 1 represents only the circuits associated with an even orifice T2 and an odd orifice T5.
  • Each orifice is associated with a gas sampling and analysis circuit and a pressure measurement and sampling circuit.
  • the gas sampling and analysis circuits of all the odd orifices are connected to the same manifold, while the gas sampling and analysis circuits associated with the odd orifices are connected to a second manifold. These two collectors are themselves connected to a common gas analysis device G.
  • the pressure sampling and measurement devices associated with the various orifices are connected to the same pressure measurement device P.
  • a network 2 of pressurized gas in this case a nitrogen network, the role of which will be specified below, as well as by a control device comprising in the example chosen a programmable automaton A which can for example be a PB6 type automaton, from the company MERLIN-GERIN, and a computer C, for example, a computer in a configuration where it comprises a central memory of 64 K.bytes, a random access memory constituted by two disks of 10 million bytes each, this computer being provided with analog inputs (for example 96) and digital inputs (for example 32) and usual peripherals such as keyboard-screens and printers.
  • a control device comprising in the example chosen a programmable automaton A which can for example be a PB6 type automaton, from the company MERLIN-GERIN, and a computer C, for example, a computer in a configuration where it comprises a central memory of 64 K.bytes, a random access memory constituted by two disks of 10 million bytes each, this computer being provided with
  • conduit 1 From the orifice T2 formed in the wall or shielding of the blast furnace F, extends a conduit 1 on which are punctured conduits 10 and 110, respectively for sampling for analysis and for pressure measurement.
  • a pneumatically controlled valve 11 controlled by an electro-valve 12 itself controlled from the programmable controller A and placed on a line 13 for supplying gas under pressure.
  • the conduit 10 is connected to a manifold 14 into which all the conduits such as 10 open, extending from even sampling orifices.
  • the collector 14 is connected by a conduit 15 and under the control of a solenoid valve 16, to a filter 17 preferably provided with heating means. Downstream of the filter 17 there is a solenoid valve 18 as well as a three-way valve 20 controlled like the valve 16 and the valve 18 from the controller A.
  • Another channel of this valve 20 is connected by a conduit 15a to a manifold 14a associated with the odd-numbered orifices, by means identical to those described for the manifold 14 and designated by the same references assigned to the index a, while the third channel of this valve is connected by a conduit 21 to the gas analysis device G, via a dryer 22 and a pump 23 ( Figure 3).
  • the gas lines upstream of the dryer are heated to prevent cold spot condensation.
  • the gas analysis device is controlled by a three-way solenoid valve 24 controlled from the computer C.
  • the three channels of this valve are respectively connected one to line 21, the second to a line 25 connected to three elementary devices 31, 32, 33 for measuring the content of C0, C02 and H2, by means of a filter 26, a flow regulator 27, a pressure sensor 28 and a flow meter 29.
  • the three elementary analysis devices are connected to the computer C, while the pressure sensor 28 and the flow meter 29 provide their information to PLC A.
  • the third channel of valve 24 is connected by a pipe 40 to three bottles of standard gas 41, 42, 43 containing respectively C0, C02 and H2, the communication between these three bottles and the pipe 40 being carried out under the control of three solenoid valves 44,45,46 controlled from the computer C.
  • the pressure measurement circuit ( Figure 2) is very simple and comprises a conduit 110 extending from the conduit 1 and connected to a main conduit 111 itself connected to a pressure sensor P of any known type.
  • the pressure sensor is itself connected to the computer.
  • the conduit 110 is controlled by a solenoid valve 112, from the automaton A.
  • circuit 1 there opens a conduit 210 on which are placed a capacity 211 and two valves 212 and 213, arranged on either side of the capacity 211. These two valves are pneumatic valves controlled by electro -valves 214,215 from PLC A.
  • the filter 17 (like the filter 17a, is provided with cleaning means, constituted by a conduit 220, 220a connected to the network 2, by means of a solenoid valve 221, 221 a, a second solenoid valve 222, 222a being disposed on a second conduit 223, 223a extending from the filter 17 (17a).
  • the dryer 22 is connected to the nitrogen network by a conduit 230.
  • the analysis operations are in fact subdivided into two series of operations first, a phase of preparation of the sampling circuit and analysis corresponding to a determined sampling orifice, then a phase proper analysis.
  • Each of these two phases has for example a duration of the order of 2 to 3 minutes. Since the duration of a pressure measurement phase is significantly shorter, for example of the order of 30 seconds, the preparation and analysis operations are considered to have priority over the pressure measurement operations.
  • FIG. 4 shows diagrammatically in which there has been shown for an installation comprising eight sampling orifices the succession of preparation, analysis and pressure measurement operations. It can be seen in this diagram that the pressure measurements are carried out on free orifices, that is to say on which the preparation or analysis is not carried out. It is also noted that while an analysis operation is carried out on a given orifice, the preparation operations preceding the analysis are carried out simultaneously on the orifice of immediately higher rank. This qestion of successive operations is carried out by the programmable controller.
  • the automaton carries out an incrementing operation making it possible to pass, for the preparation, to the orifice of immediately superior rank, in this case, the orifice of rank n, while the analysis operation on will take place. hole n-1.
  • the incrementing operation brings it back to the value 1.
  • the controller then performs a test to determine if a pressure measurement operation is in progress on the orifice of rank n. If this is the case, it performs a standby which can be equal to the duration of the pressure measurement operation, that is to say, for example 30 seconds. On the other hand, if no pressure measurement is carried out on the designated orifice, the automaton triggers the start of the preparation phase of the orifice n, which in fact comprises two essential operations, an operation of purging the pipes and a line preparation operation.
  • the purge operation of the pipe 1 is carried out by opening the valve 212 controlled by the valve 214 so as to fill the capacity 211 with nitrogen. A certain period of time is waited, for example 5 seconds to fill this capacity. Then the valve 212 is closed and the valve 213 controlled by the valve 215 is opened. The capacity 211 is then emptied in the sampling tube 1 and a certain period of time, for example 5 seconds, is waited for the purge be realized. The valve 212 is then closed and the capacity 211 is thus isolated again.
  • the line preparation operations continue with the closing of the valve 18 and the opening of the valve 222, the valve 221 being closed, so as to establish a path through the filter 17 in the direction of the purge duct 223. Then the valve 11 controlled by the valve 12 is opened and the valve 16 is opened between the manifold 14 and the filter 17. The final path thus established remains open for a certain period, sufficient to allow the establishment of a regular regime these gases from the orifice Tn.
  • the phase of analysis of the gases sampled from the orifice n-1 continued.
  • the solenoid valve 20 is controlled so as to close the communication between the conduits 15a and 21 and open the communication between the conduits 15 and 21.
  • the valve 222 is closed and the valve 18 open.
  • the valve 221 remains closed.
  • the path of the gases is thus established in the direction of the analysis device G and this path remains established for the entire necessary time which may for example be between 2 and 3 minutes.
  • a cleaning operation of the filter 17 is triggered which consists, after closing the valves 16, 18, in opening the valves 221 and 222 in order to pass a current d through the filter 17 'nitrogen. After a determined duration which can be, for example, of the order of 20 seconds, the valves 221 and 222 are closed.
  • the computer 6 reads on the automaton the number of the orifice on which these measurements have just been made, as well as the values supplied by the analysis device.
  • This computer is for example equipped and programmed so as to keep in memory for each orifice the analysis values carried out for a certain duration, for example four hours.
  • the computer stores in memory the number of analyzes carried out, and the sum of the values of these analyzes, for each of the gases analyzed, for a determined period, for example two hours.
  • the computer performs an average calculation by dividing the sum of the measured values by the number of measurements made. These average values calculated over two-hour periods are stored in a file.
  • the calculator carries out in the same way a calculation of the average over a second period which can be for example of eight hours, and stores in a second file the values of the means corresponding to the periods of eight hours. And always in the same way it performs a calculation of the average values over a 24 hour period and stores in a third file these average values per 24 hour period.
  • the calculator can also be programmed to perform automatic editing, for example once a day, averages over two hours, eight hours and twenty four hours. It is also possible for the user to edit on demand, i.e. individual analyzes
  • the computer can be programmed to calculate from the analysis values measured for C0, C02 and H2 the nitrogen contents which are obtained by difference.
  • the computer C is responsible for controlling a calibration operation of the analysis device during which the automaton A stops the sampling operations. This calibration operation is carried out with a determined period. To achieve this, the computer causes the valve 24 to tilt to close the communication between the conduit 21 and the conduit 25 and open the communication between the conduit 40 and the conduit 25 and the analysis device.
  • the computer successively controls the opening of the valves 44, 45, 46 associated with the standard gas bottles 41, 42, 43, and when the gas flow rate of each of these bottles is stabilized, a measurement is made, the measured value supplied by the analysis device is compared with a theoretical value stored in memory in the computer and as a function of the result of this comparison, the reference values with respect to which the measurements are carried out in the analysis device are kept or modified. The sampling and analysis process then resumes normally.
  • This opening of the valves associated with 1 chosen orifice determines the start of a pressure measurement period which can be, for example, 30 seconds.
  • the automaton checks the opening of the valves 112 and 114 so as to verify that the circuit has indeed been placed in a state allowing a correct pressure measurement to be made. This verification is carried out by means of position sensors with which the valves 112 and 114 are fitted and which are connected to the automaton. If this verification is negative, the automaton decides that the measurement is not validated and does not provide the computer with a signal authorizing it to take this measurement into account. Otherwise, the automaton supplies the computer with a validation signal and the computer then reads on the automaton the number of the orifice on which the pressure measurement has just been carried out and on the pressure sensor P the value of the measurement performed.
  • the computer fulfills a certain number of tasks with regard to the processing of the information relating to the pressure measurements, their storage and their editing.
  • the computer keeps in memory the pressure values measured for each of the orifices for a period which, for example, may be four hours.
  • it counts for each orifice the number of measurements made during a determined period, two hours for example, and adds, in a suitable memory area, the values measured during this two-hour period.
  • it performs an average calculation, the average values for successive two-hour periods being stored in a first file.
  • the calculator likewise performs an average calculation over a period of 8 hours for example then over a period of 24 hours and stores in a second and a third file, these average values corresponding to periods of 8 hours and 24 hours.
  • a task of automatic editing of the average values over 2, 8 and 24 hours can be scheduled.
  • the user can edit at will either the individual values stored during the last 4 hours, or the average values corresponding to the 2, 8 and 24 hour periods.
  • the means used are extremely reliable, taking into account in particular the presence of means making it possible to carry out a purge and a preparation of the different sampling lines from which the measurements are carried out. Particularly contributing to this good reliability is the presence of means for insufflating nitrogen under pressure, which makes it possible to avoid blockages in the pipes in the area close to the sampling orifice.
  • automaton in addition to its role of controlling most of the installation, also monitors the proper functioning of this installation by being connected to temperature, pressure, flow sensors, etc. which, if certain thresholds are exceeded, cause an alarm signal to appear or certain parts of the installation to shut down.
  • dryers filters, pumps, analysis devices, etc.
  • means can be provided for making temperature measurements at determined locations of the blast furnace and processing the result of these measurements.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Sampling And Sample Adjustment (AREA)
  • Manufacture Of Iron (AREA)
  • Blast Furnaces (AREA)
  • Electronic Switches (AREA)
  • Saccharide Compounds (AREA)
  • Crucibles And Fluidized-Bed Furnaces (AREA)
  • Tunnel Furnaces (AREA)
  • Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
  • Electric Stoves And Ranges (AREA)
  • Control Of High-Frequency Heating Circuits (AREA)
  • Crystals, And After-Treatments Of Crystals (AREA)
EP85401963A 1984-10-19 1985-10-08 Procédé et installation pour le contrôle en continu des hauts-fourneaux Expired EP0181245B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT85401963T ATE39268T1 (de) 1984-10-19 1985-10-08 Verfahren und vorrichtung zur kontinuierlichen ueberwachung eines hochofenganges.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8416082 1984-10-19
FR8416082A FR2572096B1 (fr) 1984-10-19 1984-10-19 Procede et installation pour le controle en continu des hauts fourneaux

Publications (2)

Publication Number Publication Date
EP0181245A1 EP0181245A1 (fr) 1986-05-14
EP0181245B1 true EP0181245B1 (fr) 1988-12-14

Family

ID=9308846

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85401963A Expired EP0181245B1 (fr) 1984-10-19 1985-10-08 Procédé et installation pour le contrôle en continu des hauts-fourneaux

Country Status (14)

Country Link
US (1) US4668285A (es)
EP (1) EP0181245B1 (es)
JP (1) JP2635544B2 (es)
KR (1) KR930009967B1 (es)
AT (1) ATE39268T1 (es)
AU (1) AU581029B2 (es)
BR (1) BR8505217A (es)
CA (1) CA1243489A (es)
DE (1) DE3566815D1 (es)
ES (1) ES8701845A1 (es)
FI (1) FI80724C (es)
FR (1) FR2572096B1 (es)
IN (1) IN166279B (es)
ZA (1) ZA857972B (es)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS625081A (ja) * 1985-07-02 1987-01-12 川崎製鉄株式会社 燃焼帯測定装置
JPS63207982A (ja) * 1987-02-25 1988-08-29 日本鋼管株式会社 竪型炉の炉内状況検出方法
JPS63207983A (ja) * 1987-02-25 1988-08-29 日本鋼管株式会社 竪型炉の炉内状況検出方法
JPH01142006A (ja) * 1987-11-30 1989-06-02 Nkk Corp 高炉操業方法
US6171364B1 (en) 1996-03-22 2001-01-09 Steel Technology Corporation Method for stable operation of a smelter reactor

Family Cites Families (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR535528A (fr) * 1921-05-14 1922-04-15 Perfectionnements aux hauts fourneaux
DE684114C (de) * 1938-03-11 1939-11-22 Bochumer Ver Fuer Gussstahlfab Verfahren zur Feststellung der Hoehe der Beschickungssaeule in Schachtoefen
US2625386A (en) * 1947-05-20 1953-01-13 David P Leone Method and apparatus for controlling blast furnaces
FR1375183A (fr) * 1963-08-28 1964-10-16 Siderurgie Fse Inst Rech Perfectionnements aux procédés de contrôle de processus industriels par analyse continue d'un mélange gazeux de composition variable
DE1583176A1 (de) * 1967-10-26 1970-07-30 Hoesch Ag Mehrpunktmesssonde zur UEberwachung von Schachtoefen,insbesondere Hochoefen
GB1238882A (es) * 1968-08-06 1971-07-14
FR2052803A5 (en) * 1969-06-24 1971-04-09 Centre Nat Rech Metall De-clogging of steel furnace pipeline
US3690632A (en) * 1970-12-30 1972-09-12 Westinghouse Electric Corp Blast furnace control based on measurement of pressures at spaced points along the height of the furnace
JPS5143588B2 (es) * 1972-06-20 1976-11-22
JPS5160620A (ja) * 1974-11-25 1976-05-26 Nippon Steel Corp Kororonaijokyokenchihoho
DE2553756C2 (de) * 1975-11-29 1977-12-08 Thyssen AG vorm. August Thyssen-Hütte, 4100 Duisburg Verwendung der kontinuierlichen Gichtgasanalyse zur Überwachung und Regelung des Hochofenganges und Vorrichtung hierfür
JPS56166313A (en) * 1980-05-27 1981-12-21 Nippon Steel Corp Method for preventing explosion during reduction of stock line and blowing down of blast furnace
JPS5770209A (en) * 1980-10-15 1982-04-30 Sumitomo Metal Ind Ltd Method of regulating circumferential distribution in blast furnace operation
JPS5871310A (ja) * 1981-10-20 1983-04-28 Sumitomo Metal Ind Ltd 高炉送風方法
JPS5916917A (ja) * 1982-07-19 1984-01-28 Nippon Steel Corp 埋込型垂直ゾンデ
US4509727A (en) * 1983-05-23 1985-04-09 Nalco Chemical Company Off-gas monitor for steel processes
JPS6067604A (ja) * 1983-09-19 1985-04-18 Sumitomo Metal Ind Ltd 高炉炉内状況測定方法

Also Published As

Publication number Publication date
JP2635544B2 (ja) 1997-07-30
FI80724C (fi) 1990-07-10
IN166279B (es) 1990-04-07
FR2572096A1 (fr) 1986-04-25
FI854075L (fi) 1986-04-20
ATE39268T1 (de) 1988-12-15
ES8701845A1 (es) 1986-12-01
DE3566815D1 (en) 1989-01-19
US4668285A (en) 1987-05-26
BR8505217A (pt) 1986-07-29
AU4880185A (en) 1986-04-24
KR870004150A (ko) 1987-05-07
AU581029B2 (en) 1989-02-09
CA1243489A (en) 1988-10-25
FI80724B (fi) 1990-03-30
KR930009967B1 (ko) 1993-10-13
ZA857972B (en) 1986-05-28
FR2572096B1 (fr) 1987-02-13
EP0181245A1 (fr) 1986-05-14
JPS61179808A (ja) 1986-08-12
ES548602A0 (es) 1986-12-01
FI854075A0 (fi) 1985-10-18

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