US3588067A - Control apparatus for blast furnace operation - Google Patents

Control apparatus for blast furnace operation Download PDF

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Publication number
US3588067A
US3588067A US847631A US3588067DA US3588067A US 3588067 A US3588067 A US 3588067A US 847631 A US847631 A US 847631A US 3588067D A US3588067D A US 3588067DA US 3588067 A US3588067 A US 3588067A
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Prior art keywords
furnace
temperature distribution
blast furnace
pattern
distribution pattern
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Expired - Lifetime
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US847631A
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English (en)
Inventor
Teruo Shimotsuma
Toshihiro Mori
Kazuo Sano
Tsuneo Miyashita
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JFE Engineering Corp
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Nippon Kokan Ltd
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    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B7/00—Blast furnaces
    • C21B7/24—Test rods or other checking devices

Definitions

  • a control apparatus for blast furnace operation comprising an infrared video monitor for receiving output image signals obtained by picking up the image of a pattern of heat rays radiated from the top portion of a blast furnace charge using an infrared vidicon camera and detecting the condition of a stock line and gas streams at the furnace top, a monitor of temperature distribution pattern for receiving output image signals from the vidicon camera and indicating a pattern of temperature distribution at the furnace top in the corresponding hues, a data processing device for being previously stored with information on optimum operating requirements related to various furnace conditions and analyzing output image signals from the vidieon camera in comparison with the stored information and a control means for continuously bringing operating factors prevailing within and without the blast furnace to a most suitable condition on the basis of summed up information on output at least from the data processing device, infrared video monitor and monitor of temperature distribution pattern.
  • FIG. 86 FIG. 8D
  • the present. invention relates to a control apparatus for blast furnace operation and more particularly to a control apparatus which involves the use of a data processing device consisting of an industrial television camera and electronic computer system.
  • a typical control process for furnace operation heretofore commonly practised only consists in inserting a thermocouple horizontally into the furnace about 1 to 2 metres from that part of the furnace wall which is positioned about 1 to 3 meters above a stock line in order to determine temperature at about 4 to 6 points in the peripheral direction and defining the height and shape of the stock line at about 2 points in the direction of the furnace diameter, using a suitable gauge such as a graduated rod or weight.
  • FIG. 1 presents a schematic longitudinal sectional view of a blast furnace equipped with an industrial television camera according to the present invention, showing its general arrangement;
  • FIG. 2 is a schematic block diagram of a control apparatus for blast furnace operation according to an embodiment of the present invention
  • FIGS. 3A to 3H indicate the concrete wave forms during operation of the various circuit sections of FIG. 2; 7
  • FIG. 4 is a more concrete schematic block diagram of the monitor 30 of temperature distribution pattern of FIG. 2;
  • FIG. 5 is a more concrete circuit diagram of the data processing means Ito 3 of FIG. 4;
  • FIG. 6 indicates the divisions of an image received bythe aforementioned embodiment
  • FIG. 7 shows the wave forms of signals for forming the divisions of FIG. 6;
  • FIGS. 8A to 8D illustrate typical temperature distribution patterns at the furnace top obtained by picking up an image by the vidicon camera of the control apparatus for blast furnace operation according to the present invention and reproducing it on a picture tube;
  • FIG. 9 shows gas distribution patterns corresponding tothe temperature distribution patterns of FIGS. 8A to 8D;
  • FIG. 10A is a sectional view of a concrete means for fitting a vidicon camera to a blast furnace;
  • FIG. 10B is a plan view of a rotary plate section taken out of the fitting means of FIG. 10A;
  • FIG. 11 is a sectional view of another concrete means for fitting a vidicon camera to a blast furnace.
  • FIGS. 12A to 12C present the typical distribution patterns of raw material located in the blast shaft.
  • FIG. 1 presents a schematic longitudinal sectional view of a blast furnace 11 showing its general arrangement.
  • the furnace is closed at the bottom and comprises an elongated cylindrical wall construction consisting, as mentioned from the top, of a furnace top 13, shaft 14, belly l5, bosh I6 and hearth 17.
  • a furnace core 18 at the bottom 12 is generally packed coke, and on the sidewall of the hearth 17 section are provided a tuyere l9, cinder notch 20 and tapping hole 21.
  • shaft 14, belly l5 and bosh 16 above the furnace core 18 are piled up in suitable thickness alternate layers of ore and coke as shown in FIGS. 12A to 12C.
  • FIG. 12A to 12C FIG.
  • FIG. 2 is a schematic block diagram of an entire apparatus for controlling the operation of a blast furnace l1 constructed as illustrated in FIG. 1.
  • the image of a pattern of heat rays radiated from a stock line 22 constituting the topmost portion of the aforesaid pile of ore and coke is picked up by one or two units of the later described infrared vidicon cameras 23 fitted to that portion of the furnace wall above the stock line 22.
  • This arrangement enables image signals corresponding to the height and shape of the stock line and the temperature distribution pattern associated with gas streams in the stock line area to be taken out of the infrared vidicon camera.
  • From the vidicon camera are issued image signals V V corresponding to charged image patterns (not shown) formed on the photoelectric plane of said vidicon by being interposed between the horizontal synchronizing signals I-Is I-Is associated with the raster scanning as shown in FIG. 3A.
  • Output image signals containing the horizontal synchronizing signals l-ls I-Is from the vidicon camera 23 are supplied to a signal processing circuit 25 for cutting signals at a suitable pedestal level Vp adapted to remove the horizontal synchronizing signals I-Is I-Is through a camera control unit 24 consisting of an ordinary amplifier and other elements. Therefore from the output terminal of said'signal processing circuit25 are obtained only the required image signals V V as shown in FIG. 3B.
  • Numeral 26 denotes an automatic control circuit provided, if necessary, to control the vidicon camera 23 by feed back.
  • the circuit 26 is so designed as to detect continuously or intermittently the pedestal level Vp of the signals processing circuit 25 and thereby render the image picking up property of the vidicon camera 23 always stable.
  • Output image signals from the signal processing circuit 25 are supplied to a video monitor 27 directly to be reproduced as black and white infrared images so as to monitor the height and shape of the stock line 22 and the condition of gas streams at all times, and thereafter to a first and second signal processing circuit 28 and 29.
  • These first and second signal processing circuits 28 and 29 are provided, if required, to cut unnecessary wave forms included in the output image signals V V
  • the image signals V,, V, as shown in FIG. 3B obtained from the first signal processing circuit 28 are supplied to the monitor 30 of temperature distribution pattern having an arrangement detailed in FIG. 4.
  • said signals divide the temperature zone to be determined into a plurality of levels such as R,, R R and R, of FIG. 3B, and pass through a plurality of Schmidt circuits which have set a plurality of isothermal voltage levels T,, T T T and T corresponding to the border lines between the divided temperature levels, for example, at their threshold values.
  • said image signals V,, V are supplied to a circuit 41 for generating a composite isothermal voltage pattern Vt consisting, as shown in FIG. 3C, of a plurality of isothermal voltages Vt Vi Vt Vt, having different levels and in consequence collectively presenting a stepped wave form pattern.
  • an isothermal image signal pattern comprising, as shown in FIGS. 3D to 3G, a plurality of isothermal voltages Vt V1 V1 and Vt Said isothermal image pattern is presented in high intensity and separate hues on the fluorescent surface of a color picture tube 42 with the respective temperature zones defined by the isothermal lines, or those between T and T between T and T between T and T and between T, and T,.
  • FIG. 5 shows the detailed arrangement of the first to third data processing devices 34 to 36.
  • the A-D converted image signals Vd Vd from the A-D conversion circuit 43 are supplied to nine gate circuits G G G G G G G G and G These gate circuits G to G correspond to the divisions of an image indicated on the picture tube as shown in FIG.
  • the component signals corresponding to the divisions of said image are selectively controlled by horizontal gate signals GH GH and GI-l and vertical gate signals GV (3V and GV;,. As illustrated, the image has nine divisions, but it may be separated into any desired number of divisions according to the required precision of determination and processing method for average values. If the gate signals OH, to GV supplied to the gate circuits 6,, to G;,;, are so set as to have timedivided wave forms as illustrated in FIG. 7, signals corresponding to the respective divisions of the image will be taken out of the gate circuits G to G and temporarily stored in the first to ninth memory circuits M to M constituting the second data processing means 45.
  • Signals from the memory circuits M to M are integrated for a given time by a means 48 for obtaining time-averaged values which consists of a counter or the like using, for example, a plurality of R-S flip-flop circuits and are taken out in the time-averaged form.
  • Said signals are further subjected to a digital to analogue conversion by a D-A converter 49 provided, if required, to form image signals denoting the temperature distribution pattern of a heated foreground subject at its prescribed parts.
  • the signals from said D-A converter 49 represent the image signals of said pattern obtained by being picked up by the vidicon camera ill, the momentary values of which were averaged on the basis of a suitably chosen length of time. If said image signals are stored in a video tape recorder 50 (hereinafter referred to as the VTR"), then there will be obtained great convenience in later reproducing and studying a temperature distribution pattern bearing values averaged over a long period.
  • VTR video tape recorder 50
  • a third data processing device 46 which comprises a voltage signal generating circuit 51 to which there are supplied image signals stored in the video tape recorder 50.
  • the aforesaid circuit S1 is arranged and operated in substantially the same manner as the isothermal voltage generating circuit 41 of FIG. 4.
  • Said circuit 51 generateswith respect to a suitably chosen length of time a plurality of average isothermal voltages corresponding to a plurality of average isothermal lines, thereby forming, substantially as in the case of FIGS.
  • the wave form patterns of image signals representing isothermal lines averaged with respect to a suitably chosen length of time are formed into color television image signals, in which, for example, the portions interposed between adjacent isothermal lines are distinguished in separate hues by a color indicating mixing circuit 52 formed of the known matrix circuit.
  • a color television picture tube 47 there is presented a timeaveraged temperature distribution pattern distinguished in separate hues. For example, where the temperature range of a foreground subject is divided into nine parts, the 1st, 4th and 7th temperature zones as counted from the lowest zone are indicated in the three primary colors of a color television apparatus, namely, blue, green and red.
  • the memory circuit is continuously supplied with information, so that there occurs a dead time for each cycle of computing average values.
  • dead time is of a negligible order as compared with a given time of integration and also checked by a monitor of momentary patterns, so that there is not raised any problem in connection with such dead time.
  • the image signals V,, V of FIG. 33 obtained from the second signal processing circuit 29 are supplied to a data processing device 35 comprising another VTR 31 provided, if required, electronic computer 32 and analyzing means 33 formed of an electronic computer, etc.
  • Output information signals from the infrared video monitor 27, monitor 30 of temperature distribution pattern and data processing device 35 are fed back, along with information signals from an analyzer 37 of external operating factors including burden, for control of furnace operation to various analyzers, such as those 38 of the primary operating factors 38 related to the raw materials for the blast furnace 11 such as the coke base, conditions in which the armature plate is employed, stock line level, etc, and those 39 of secondary operating factors related to the blower system of the blast furnace 11 such as the volume, temperature, humidity and pressure of blasts and amount ofinjected materials.
  • the control apparatus for blast furnace operation enables the furnace operation to be controlled easily as well as continuously to optimum conditions and also the previously mentioned abnonnalities to be readily foreseen and prevented.
  • the present invention allows any abnormality in the height and shape of the stock line of the furnace charge and gas streams to be observed in the form of an infrared image because a pattern of heat rays generated from the top of the blast furnace 11 by a vidicon camera, and the resultant image signals are supplied to the infrared video monitor 29 through the signal processing circuit 25.
  • the invention permits the momentary and time-averaged temperature distribution patterns of the furnace top to be visually checked using the monitor 30 of temperature distribution pattern and also the operating condition of the furnace to be analyzed by the data processing device 35.
  • the furnace condition can always be analyzed or estimated by summing up output information signals from the infrared video monitor 27, monitor 30 of temperature distribution pattern and data processing device 35.
  • the furnace operation can be continuously controlled to optimum conditions by associating data thus analyzed or estimated with the requirements for controlling the primary and secondary operating factors checked by the respective analyzers 38 and 39.
  • FIGS. 8A to 8D present the typical temperature distribution patterns actually observed by the monitor 30 of temperature distribution pattern of the present invention while the aforesaid No. l blast furnace was in operation.
  • the isothermal divisions of these FIGS. represent several groups of temperature: (1) over 500 C., (2) 400 to 500 C., (3) 300 to 400 C., (4) 200 to 300 C. and (5) below 200 C.
  • FIG. 8A denotes the temperature distribution pattern of said furnace in mean operation
  • FIG. 8B in wall operation
  • FIG. SC in inner operation
  • FIG. 8D in hanging operation.
  • target temperature distribution pattern is defined in advance and measures are taken to realize the desired operating condition of the furnace, it will be possible to carry out most suitable control, elevate productivity, reduce the ratio of coke to ore and additionally foresee to some extent the occurrence of abnormalities such as hanging operation, blow through, etc. with the resultant maintenance of high operating efficiency.
  • FIG. 10 illustrates the manner in which the infrared vidicon camera 23 is actually fitted.
  • the furnace wall is bored with an opening 61 for determination.
  • a rotary plate 63 On the outside of the opening 6] is disposed a rotary plate 63 in a manner to rotate around a rotary shaft 62.
  • In said rotary plate 63 are formed three determination holes positioned at the apices of an equilateral triangle with the rotary shaft 62 as the center. All these determination holes are fixed by bolt and nut 65 and sealed by heat-resistant transparent glass material 67 with heat-resistant packing made of, for example, asbestos or silicon rubber allowed to lie therebetween.
  • any of the determination holes is selectively allowed to face the opening 61 by rotating the rotary plate 63, the remaining two are shielded by blind flange 64.
  • Numeral 70 denotes a pipe for supplying nitrogen gas for dust purge and cooling.
  • the reason why there are provided in this case a plurality of determination holes is that dust generated in the operating furnace contaminates the surface of the heat-resistant transparent glass material 67 fitted to the detennination hole exposed to the furnace interior with the resultant decrease in the image picking-up capacity of the vidicon camera and that if the determination holes are used by turns in time sequence for removal of said dust, then the vidicon camera will always display a good image picking-up effect.
  • While the number of said cameras to be fitted to the furnace top is suitably determined according to the angle at which it is set in place, the preferred number will be one or two.
  • FIG. 11 illustrates a vidicon camera assembly additionally provided with a condenser 71.
  • This condenser 71 is supplied with nitrogen gas for dust purge and cooling through a pipe 70, and that part of the heat-resistant glass material 67 which faces the furnace interior is supplied with said nitrogen gas through a pipe 72. It will be apparent, therefore, that the means of FIGS. and 11 may be jointly used in order to operate the infrared vidicon camera 23 under a more suitable condition.
  • FIGS. 12A to 12C are associated with the case where the control apparatus of the present invention was applied to another blast furnace.
  • the control apparatus of the present invention was applied to another blast furnace.
  • there was formed at the furnace top a peep hole whose maximum field of vision had a horizontal angle of 60 and vertical angle of 50, in a manner as shown in FIG. 10 and there was fitted an infrared vidicon camera to said peep hole.
  • Determination of the temperature of a stock line at the furnace top resulted in the temperature distribution patterns of FIGS. 8A to 8D according to the various furnace conditions prevailing at the time of said determination.
  • FIGS. 12A to 12C there were derived the distribution patterns of furnace charge in the shaft section as illustrated in FIGS. 12A to 12C.
  • FIG. 12A represents a distribution pattern in the mean operation of the aforesaid blast furnace, FIG. 128 such pattern in the wall operation and FIG. 12C such pattern in the inner operation.
  • the present invention now permits such temperature distribution pattern to be determined externally without physically touching the furnace charge over the entire horizontal crosssectional area of the furnace top continuously and at the same time and further momentary changes in the temperature distribution pattern over said cross-sectional area to be followed quickly.
  • control apparatus of the present invention enables the shape of the stock line to be monitored continuously at the same time the temperature distribution pattern is determined over the entire horizontal cross-sectional area of the furnace top, though said shape was formerly only inferred from the data obtained by inserting a rod gauge or the like.
  • control apparatus of the present invention can be employed in the most desired control processes for elevated efficiency as listed below:
  • control apparatus of the present invention permits the instant application of control processes of varying the above-listed factors so as to obtain an optimum temperature distribution pattern and is also very effective for early discovery of abnormalities. Also procurement of continuous information on the shape and temperature distribution pattern of stock line at the fumace top offers great advantage in properly estimating or controlling the furnace operation for its improvement.
  • control apparatus of the present invention is not limited to the operation of the aforementioned type of blast furnace, but is also applicable to all other general shaft-type blast furnaces including low shaft and cupola types, thus offering great convenience in realizing the optimum operation of blast furnaces in general. Further, the control apparatus of the present invention can be employed in determining the temperature distribution pattern over the horizontal cross-sectional area of a sintering apparatus just before the sintered ore is discharged so as to control its optimum operating process, thereby obtaining high quality product.
  • a control apparatus for blast furnace operation which comprises an infrared vidicon camera for picking-up the image of a pattern of heat rays radiated from the top portion of a blast furnace charge, an infrared video monitor for receiving output signals from said vidicon camera and detecting the condition of a stock line and gas streams at the furnace top, a monitor of temperature distribution pattern for receiving output image signals from the vidicon camera and indicating a pattern of temperature distribution at the furnace top in the corresponding hues, a data processing device for being previously stored with information on optimum operating requirements related to various furnace conditions and analyzing output image signals from the vidicon camera in comparison with the stored information and a control means for continuously bringing operating factors prevailing within and without the last furnace to a most suitable condition on the basis of summed up information on outputs at least from the data processing device, infrared video monitor and of monitor of temperature distribution pattern.
  • a control apparatus wherein there-is provided one infrared vidicon camera or two disposed in a manner to face an opening formed in that part of the furnace wall which is positioned slightly above the stock line charged at the furnace top.
  • a control apparatus according to claim 2 wherein the infrared vidicon camera involves a rotary plate perforated with a plurality of determination holes fitted with heat-resistant transparent glass material, said holes being opened to the outside of that part of the furnace wall facing the stock line.
  • a control apparatus according to claim 1 wherein the data processing device comprises an electronic computer system.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Radiation Pyrometers (AREA)
  • Blast Furnaces (AREA)
US847631A 1968-08-08 1969-08-05 Control apparatus for blast furnace operation Expired - Lifetime US3588067A (en)

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Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4094494A (en) * 1976-02-09 1978-06-13 S. A. Des Anciens Etablissements Paul Wurth Furnace charge profile measuring process and apparatus
US4110617A (en) * 1976-03-17 1978-08-29 S.A. Des Anciens Establissements Paul Wurth Infra-red profilometer
US4122392A (en) * 1975-08-20 1978-10-24 Nippon Steel Corporation System of detecting a change in the charge put in a metallurgical furnace or the like
US4197495A (en) * 1976-07-09 1980-04-08 Nippon Steel Corporation System for controlling the charge distribution and flow in blast furnace operations using magnetic sensors positioned within the charge
US4254338A (en) * 1978-04-18 1981-03-03 Bergwerksverband Gmbh Determination of temperature distributions on awkwardly located or low-access surfaces
US4315771A (en) * 1979-01-31 1982-02-16 Institut De Recherches De La Siderurgie Francaise Process to continuously determine the profile of a charge fed into a blast furnace
US4378994A (en) * 1980-01-09 1983-04-05 Kobe Steel, Ltd. Method for estimating geographical distribution of cohesive zone in blast furnace
US4434368A (en) 1980-12-24 1984-02-28 Arbed, S.A. Method of measuring the reducing power of gases over the charge in a blast furnace
US4463437A (en) * 1981-04-27 1984-07-31 Bethlehem Steel Corp. Furnace burden thermographic method and apparatus
US4539588A (en) * 1983-02-22 1985-09-03 Weyerhaeuser Company Imaging of hot infrared emitting surfaces obscured by particulate fume and hot gases
WO1986004475A1 (en) * 1983-02-22 1986-07-31 Weyerhaeuser Company Imaging of hot infrared emitting surfaces obscured by particulate fume and hot gases
WO1988002891A1 (en) * 1986-10-16 1988-04-21 Imatran Voima Oy Method of image analysis in pulverized fuel combustion
USRE33857E (en) * 1983-02-22 1992-03-24 Weyerhaeuser Company Imaging of hot infrared emitting surfaces obscured by particulate fume and hot gases
US5110365A (en) * 1990-12-03 1992-05-05 The Babcock & Wilcox Company Control of furnace cleaning for reflective ash using infrared imaging
US5592217A (en) * 1992-02-25 1997-01-07 Imatran Voima Oy Assembly for combustion chamber monitoring camera
US5831668A (en) * 1992-02-25 1998-11-03 Imatran Voima Oy Assembly for combustion chamber monitoring camera
US20100270714A1 (en) * 2009-04-28 2010-10-28 China Steel Corporation Apparatus for observing interior of a blast furnace system
CN110760633A (zh) * 2019-11-26 2020-02-07 中冶赛迪重庆信息技术有限公司 高炉炉内气流分布控制方法、装置、存储介质及电子终端

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2354386A1 (fr) * 1976-06-11 1978-01-06 Centre Rech Metallurgique Procede pour assurer et maintenir la proprete d'un orifice d'observation
BE872578A (fr) * 1978-12-06 1979-03-30 Centre Rech Metallurgique Dispositif pour controler la surface de la charge d'un four a cuve
SE421832B (sv) * 1979-04-18 1982-02-01 Pharos Ab Anordning for att registrera topografin hos den chargerade massan i en masugn
US4301998A (en) * 1980-04-25 1981-11-24 Pfizer Inc. Vertical gunning apparatus with television monitor
DE19815827A1 (de) * 1998-04-09 1999-10-14 Univ Ilmenau Tech Vorrichtung zur Untersuchung thermischer Vorgänge an Werkstoffproben
DE102008064142A1 (de) 2008-12-19 2010-07-01 Z & J Technologies Gmbh Messvorrichtung und Messverfahren für einen Hochofen, Hochofen mit einer derartigen Vorrichtung und Schwenkvorrichtung für wenigstens eine Messsonde
JP6631588B2 (ja) * 2017-05-22 2020-01-15 Ｊｆｅスチール株式会社 装入物降下速度の偏差検出方法および高炉操業方法

Cited By (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4122392A (en) * 1975-08-20 1978-10-24 Nippon Steel Corporation System of detecting a change in the charge put in a metallurgical furnace or the like
US4094494A (en) * 1976-02-09 1978-06-13 S. A. Des Anciens Etablissements Paul Wurth Furnace charge profile measuring process and apparatus
US4110617A (en) * 1976-03-17 1978-08-29 S.A. Des Anciens Establissements Paul Wurth Infra-red profilometer
US4197495A (en) * 1976-07-09 1980-04-08 Nippon Steel Corporation System for controlling the charge distribution and flow in blast furnace operations using magnetic sensors positioned within the charge
US4254338A (en) * 1978-04-18 1981-03-03 Bergwerksverband Gmbh Determination of temperature distributions on awkwardly located or low-access surfaces
US4315771A (en) * 1979-01-31 1982-02-16 Institut De Recherches De La Siderurgie Francaise Process to continuously determine the profile of a charge fed into a blast furnace
US4378994A (en) * 1980-01-09 1983-04-05 Kobe Steel, Ltd. Method for estimating geographical distribution of cohesive zone in blast furnace
US4434368A (en) 1980-12-24 1984-02-28 Arbed, S.A. Method of measuring the reducing power of gases over the charge in a blast furnace
US4463437A (en) * 1981-04-27 1984-07-31 Bethlehem Steel Corp. Furnace burden thermographic method and apparatus
WO1986004475A1 (en) * 1983-02-22 1986-07-31 Weyerhaeuser Company Imaging of hot infrared emitting surfaces obscured by particulate fume and hot gases
US4539588A (en) * 1983-02-22 1985-09-03 Weyerhaeuser Company Imaging of hot infrared emitting surfaces obscured by particulate fume and hot gases
USRE33857E (en) * 1983-02-22 1992-03-24 Weyerhaeuser Company Imaging of hot infrared emitting surfaces obscured by particulate fume and hot gases
WO1988002891A1 (en) * 1986-10-16 1988-04-21 Imatran Voima Oy Method of image analysis in pulverized fuel combustion
US5110365A (en) * 1990-12-03 1992-05-05 The Babcock & Wilcox Company Control of furnace cleaning for reflective ash using infrared imaging
AU635166B2 (en) * 1990-12-03 1993-03-11 Diamond Power International, Inc. Furnace cleanliness monitor for high reflectivity ash
US5592217A (en) * 1992-02-25 1997-01-07 Imatran Voima Oy Assembly for combustion chamber monitoring camera
US5831668A (en) * 1992-02-25 1998-11-03 Imatran Voima Oy Assembly for combustion chamber monitoring camera
US20100270714A1 (en) * 2009-04-28 2010-10-28 China Steel Corporation Apparatus for observing interior of a blast furnace system
US8052920B2 (en) * 2009-04-28 2011-11-08 China Steel Corporation Apparatus for observing interior of a blast furnace system
CN110760633A (zh) * 2019-11-26 2020-02-07 中冶赛迪重庆信息技术有限公司 高炉炉内气流分布控制方法、装置、存储介质及电子终端

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DE1940104B2 (de) 1978-07-27
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JPS4823762B1 (enrdf_load_html_response) 1973-07-16
BE737293A (enrdf_load_html_response) 1970-01-16
FR2015311A1 (enrdf_load_html_response) 1970-04-24

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