JP6298166B2 - Method and probe for determining raw material distribution in a blast furnace - Google Patents

Description

  The present invention relates generally to an apparatus and method for determining the feed distribution of charges in a blast furnace (blast furnace). More particularly, the present invention relates to an apparatus and method for determining the feed distribution of a blast furnace charge based on the conductivity of the charge without directly contacting the measuring device.

  Various methods and apparatus are known in the art for determining the feed distribution within a blast furnace. Determination of the raw material distribution within the blast furnace is a quantitative analysis of the radial distribution of various charges, such as coke and iron ore raw materials. Since the blast furnace is a countercurrent reactor, breathability is important for the process. In order to influence it, different layers of coke and iron ore feedstock of well-defined composition are charged rather than a homogeneously mixed charge. Thanks to the determination of the raw material distribution, the shape and thickness of the raw material layer in the blast furnace can be determined and, if necessary, can be adjusted and optimized to improve the performance of the blast furnace.

  Several methods are known for determining the structure of the layers in the blast furnace. The most common method is a radar profilometer that measures the shape of the charge surface after each material layer is charged. Measurements are limited to the charge surface, so dynamic effects that occur below and during the charge surface are not recorded. An alternative method of monitoring charge permeability is the measurement of radial temperature and gas distribution profiles either above or below the charge surface. Although this method directly leads to the final radial distribution and central chimney size, the optimization of the charge based on this measurement is difficult because the detailed structure of the different layers is not determined.

  A different method is proposed by Japanese Patent Laid-Open No. 2007-155570. In view of the difficulty of measuring the distribution of the raw material inside the blast furnace, Japanese Patent Application Laid-Open No. 2007-155570 proposes to determine the relative amount of the charge during the charging of the raw material from the hopper into the blast furnace. doing. The measuring method is characterized in that a mixture of substances having different electromagnetic characteristics is arranged inside a hollow coil to which an alternating current is applied, or the mixture is passed in the axial direction of the coil. The output voltage generated by the coil is measured, and the mixing ratio of substances in the mixture is determined based on the output voltage.

  The exciting coil and the measuring coil are arranged in the same axial direction, and then the mixture is arranged inside the coil, or the mixture is passed in the axial direction of the coil, and the output voltage generated by the measuring coil is measured. A calibration curve is obtained by measuring in advance the relationship between the mass of the substance and the output voltage generated by the coil, and the mixing ratio of the substance in the mixture is calculated based on the calibration curve.

  Such a method and apparatus may be useful for determining the relative amounts of different raw materials during the charging of the raw material into the blast furnace, but after the charging is charged, It is not useful for determining exactly how the ingredients are dispersed within the object. In fact, the raw materials have different densities and / or particle size distributions and can segregate during the charging operation. Physical phenomena that interact during the formation of the charge layer include the rolling of the raw material on the charge surface, the penetration of the raw material in the lower layer caused by the impact force, the stirring of the raw material caused by the rising process gas, and the previous loading. There is a mix with the raw materials entered. Furthermore, since the charge inside the blast furnace is not stationary, it moves down and is partially consumed, so its surface profile and the shape of the layer formed will change over time.

  A more suitable solution for determining the structure of the layers in the blast furnace is proposed in EP-A-1029085. Repeatedly insert the probe horizontally and below the charge surface in the blast furnace. The raw material detection sensor disposed at the tip of the probe indicates the presence or absence of either coke or iron ore raw material. An image of the raw material distribution is obtained by a combination of high-speed horizontal movement of the probe and low-speed vertical charge lowering speed.

  The raw material detection sensor indicates the type of charge based on the measurable physical properties of the charge. Numerous methods are available in the technical field of blast furnaces.

  The first example is magnetic permeability. While the magnetic permeability of the ore-like raw material is high, coke has a low magnetic permeability as well as the magnetic permeability of air. Several methods have been developed to determine the permeability of the raw material in the blast furnace to conclude the raw material distribution. In GB 2205162, the permeability of a raw material is measured by moving the inside of a blast furnace tube into a single coil. Measure the auto inductance of the coil with the sensor coil. This value increases in the presence of magnetically permeable raw material within the field lines of the coil, and when this value increases, ore is detected. In German Offenlegungsschrift 2655297, a permanent magnet is aligned with a magnetic field sensor and installed in a blast furnace. When the magnetically permeable material is present in the magnetic field lines of the permanent magnet, the magnetic flux increases. If the magnetic field sensor indicates this increase in magnetic flux, ore is detected.

The problem of permeability in raw material distribution measurement as in DE 2655297 is that there is usually a large temperature range from 100 ° C. near the blast furnace wall to 900 ° C. or more at the blast furnace center. . At this temperature, since the raw material temperature exceeds the Curie point, the magnetic permeability of the iron ore disappears. In the case of iron ore III (Fe ₂ O ₃ ), the Curie point is 675 ° C., and in the case of iron ore II-III (Fe ₃ O ₄ ), the Curie point is 585 ° C. Therefore, the characteristic which distinguishes a raw material has lose | disappeared. In the temperature range near the Curie point, particularly in the temperature range above the Curie point, the magnetic permeability cannot be used to measure the raw material distribution in the blast furnace.

  A second example characteristic for determining the type of charge is the remanence of iron ore. In German Offenlegungsschrift 2637275, a strong magnetic field is generated to excite the self-magnetism of the ore. The magnetic field is then switched off and the sensing device can detect the ore via the residual magnetic field. However, above the Curie point, the self-magnetism of the ore also disappears, causing the same problem as described above.

  A third example is the radar wave absorption of ore presented in EP-A-0101219. The ore's radar absorption is higher than that of coke. A radar wave antenna for emitting and receiving radar waves is disposed in the blast furnace. The raw material located between the radar wave antennas is identified based on the reflection and absorption of the radar wave. The disadvantage of radar-based measurements is that radar devices, especially waveguides and antenna components, are fragile and technically very difficult to install under charge probes.

  A fourth example is based on the conductivity of coke and iron ore as described in EP-A-1029085 and DE-A-3105380. Since conductivity of coke is known to persist to temperatures above 1300 ° C., conductivity is a preferred method.

  Currently, the raw material distribution is measured by loading the probe horizontally into a blast furnace as described in EP-A-1029085. Two electrodes are disposed at or near the tip of the probe, separated from each other by an isolator and connected to each other by an electrical measurement circuit. The electrical measurement circuit determines the signal quality of the electrical circuit when the sensor tip is inserted into the blast furnace. The signal quality depends on the conductivity of the charge around the sensor in the blast furnace. The electrical circuit closes when the electrodes are connected through a layer of conductive material. The electrode does not connect when the sensor tip passes through the layer of non-conductive material. Because of the difference between measurements of conductive and non-conductive raw materials, the probe can determine which raw materials are nearby.

However, when the probe is inserted into the blast furnace, dust deposits are inevitably formed on the isolator. These dust deposits are conductive and create a short circuit between the electrodes, making accurate measurements impossible. The solution is to use soft ceramics as an isolator because there is always dust in the blast furnace due to the large amount of coke, high gas flow rates, and possibly additional fuel particle injection. Because these ceramic isolators have a specific wear rate, no dust deposit is formed when the measurement is made. In fact, because the charge in the blast furnace is hot and wearable, the friction of the isolator against the charge during probe introduction and recovery wears the isolator every time a measurement is made, and therefore dust deposits. Is not formed. After a specific number of measurements, at least the isolator must be replaced. This results in increased costs and requires regular maintenance.
Therefore, there is a need for a more efficient method or apparatus for measuring the raw material distribution within the blast furnace charge after the raw material is charged into the blast furnace.

Japanese Unexamined Patent Publication No. 2007-155570 European Patent Application No. 1029085 British Patent No. 2205162 German Patent Application Publication No. 2655297 German Patent Application Publication No. 2,637,275 European Patent Application No. 0101219 German Patent Application Publication No. 3105380

  An object of the present invention is to provide a method and a probe for determining a raw material distribution of a raw material in a charge in a blast furnace at an arbitrary temperature.

  This object is achieved by the method according to claim 1 and the probe according to claim 11.

To achieve this objective, the present invention determines the feed distribution in the charge containing iron ore and coke in the blast furnace without direct contact by inserting the probe into the charge inside the blast furnace. We propose a measurement probe for this purpose.

The measurement probe includes the following components. That is,
-At least one sensor,
A transmission coil having a transmission surface, and
A sensor comprising a receiving coil having a receiving surface;
A protective shell that houses the sensor and protects the transmitter and receiver coils from heat and wear;
An alternating current power source for applying an alternating current having a frequency of 0.5 to 5 MHz and an amplitude of about 1 to 10 mA to the transmission coil;
The transmitting coil emits a primary alternating magnetic field, which induces eddy currents in the conductive material of the charge. The eddy current generates a secondary AC magnetic field and the receiver coil measures the current produced by the primary AC magnetic field and the secondary AC magnetic field;
-Current is a control and evaluation unit for evaluating the measured current, which indicates the raw material distribution of the charge in the blast furnace.

  Since the measurement is based on conductivity, the probe must determine the raw material distribution inside the blast furnace charge at any temperature above or below the Curie point, or at the Curie point, in real time. Can do. In contrast to raw material permeability, conductivity is a suitable property that can be trusted throughout the temperature range in the blast furnace.

  Thanks to the detection of induced eddy currents, the sensor can determine the raw material distribution without directly contacting the charge. Since the sensor is located inside the protective shell, it is protected from heat and wear. The sensor is therefore not directly exposed to the harsh blast furnace situation and therefore lasts longer. The main factors affecting lifespan are large amounts of dust, chemically reactive and corrosive atmospheres, extreme heat, and forces from charges leading to wear or destruction. The lifetime of the measuring probe is increased compared to prior art sensors, for example as described in EP-A-1029085.

  The measuring probe according to the invention is insensitive to dust, in particular to dust deposits on the protective shell in front of the sensor. The dust particles only produce very weak and hardly detectable eddy currents, which do not disturb the measurement results. A wear solution for removing dust deposits necessary to implement EP-A-1029085 is no longer necessary.

  Furthermore, in contrast to Japanese Unexamined Patent Publication No. 2007-155570, the raw material does not pass inside the hollow coil. According to a preferred embodiment of the invention, the sensor can be applied directly to the inside of the protective shell. Alternatively, the sensor can be applied to a support or support layer applied to the inside of the protective shell. In this case, the sensor is disposed between the protective shell and the support layer. The support must be heat resistant and non-conductive, such as soapstone or mica.

  According to a preferred embodiment of the present invention, the protective shell comprises a ceramic material that is not electrically conductive. The sensor is thereby well protected against heat and wear inside the blast furnace. Excellent measurement results are obtained with a protective shell having a thickness in the range of 10-25 mm. The shell is preferably an annular cylinder.

  The transmitting coil and the receiving coil are preferably arranged so that the magnetic flux of the transmitting coil is concentric with the magnetic flux of the receiving coil.

  A plurality of sensors can be arranged at the tip of the probe. In a preferred embodiment, the coils are designed so that their magnetic fields interfere only at the periphery. In that case, several independent sensors can be arranged at the tip of the probe inside the same protective shell. This significantly improves the resolution of the raw material distribution determination. Furthermore, such an arrangement of multiple sensors reduces the need for a high horizontal velocity of the probe as required in the prior art.

  The contact electrode as used in EP-A-1029085 must be strong enough to support the force of the blast furnace charge. Thus, the electrodes on the probe are large steel rings that are exposed to high temperature charges. Only one measurement sensor can be placed at the probe tip. Since only one measurement signal can be obtained, this leads to limited measurement resolution and the need for high horizontal velocity of the probe.

Advantageously, the transmission coil has a transmission surface in the range of 1 to ²⁰ cm ² . The size of the transmission surface determines the measurement spot by creating a magnetic field that excites eddy currents in the charge. The larger the transmission surface, the larger the measurement spot.

Receiving coil preferably has a receiving surface in the range of 5 to 50 cm ^2. Since the received signal is not significantly affected by the primary magnetic field and is more greatly affected by the secondary magnetic field from the eddy current, the signal strength increases as the size increases.

  Advantageously, an alternating current having a frequency of 0.5 to 5 MHz and a magnitude of 1 to 10 mA is applied to the transmitting coil. A sufficiently high frequency is selected so that sufficient eddy currents are generated in coke known to have a resistivity of 2-6 Ω · cm at 300 ° C. and 0.5-2 Ω · cm at 1300 ° C. In this frequency range, fairly long cables can be used to transmit the transmit coil signal to the control unit. For frequencies higher than 5 MHz, the signal generated by the transmitter coil may not be reliably transmitted to the electronic control unit via a fairly long cable.

  A sufficiently high magnitude is selected for a reasonable signal to noise ratio. A size exceeding 10 mA can be regarded as a safety risk because an electrical spark may theoretically be generated if the sensor malfunctions.

  The transmission coil and the reception coil are preferably circular or rectangular. However, those skilled in the art can form the transmission coil and the reception coil according to the necessity.

  The probe can be arranged movably in a horizontal direction with respect to the blast furnace shell so that the probe is inserted into the blast furnace in order to determine the raw material distribution in the blast furnace. Due to the movable configuration, the raw material distribution at various horizontal positions in the blast furnace is determined by changing the position of the probe disposed in the blast furnace, as described in EP-A-1029085. be able to. The horizontal movement speed is preferably higher than the lowering speed of the charge so that the composition of the charge (ie radial feed distribution) can be measured by collecting data during repeated movement.

  In a further embodiment, the probe is fixedly disposed in the blast furnace shell and below the top surface of the charge inside the blast furnace. The probe is preferably located at a short distance from the blast furnace wall, and the probe setup may be similar to the “site block” system described in DE 3105380. Such a probe can then measure the timely development of the raw material at a fixed radius position inside the blast furnace. The goal is to obtain the quantity and raw material type (ie raw material distribution) at one radial position as a function of time.

According to another aspect, the present invention also relates to a method for determining a feed distribution within a blast furnace charge. The method includes the following steps.
-Inserting the measuring probe into the blast furnace charge. The measurement probe has a sensor having a receiving coil and a transmitting coil, and the sensor is accommodated inside the protective shell.
Applying an alternating current having a frequency of 0.5 to 5 MHz and an amplitude of about 1 to 10 mA to the transmitting coil so that a primary alternating magnetic field is generated by the transmitting coil; The primary alternating magnetic field induces eddy currents in the conductive material of the charge. Eddy currents generate a secondary alternating magnetic field.
Measuring the current generated by the primary and secondary alternating magnetic fields by the receiving coil;
-Evaluating the raw material distribution of the charge based on the current in the receiving coil;

  The current rating is preferably used to control the blast furnace distributor chute. As a result, the raw material charge can be adapted based on the measurements performed by the method or apparatus according to the invention.

  The probe and the method thus make it possible to determine the raw material distribution in the radial direction and / or the shape, size and composition of the charge layer.

The signal indicating the type of raw material (that is, the current generated by the primary AC magnetic field and the secondary AC magnetic field by the receiving coil) is preferably processed using a model. Not only data for the entire radius (x-axis due to horizontal movement of the probe, or one fixed x point in the case of low-cost fixed probes), but also over time (charge moving downwards vertically) By collecting data (in the y-axis direction due to descent), the distribution of the charge is measured (in the sense of raw material placement inside the columnar charge). Model results, as described in more detail below, are used to understand and optimize the blast furnace process and, if necessary, adjust the feed chute feed distribution program.
Further details and advantages of the present invention will become apparent from the following detailed description of non-limiting embodiments in connection with the accompanying drawings.

It is the schematic of the measurement probe which concerns on suitable embodiment of this invention. It is a schematic diagram of arrangement of a plurality of sensors (cutting side view) concerning a suitable embodiment of the present invention. FIG. 3 is a schematic view of a measurement magnetic flux according to a preferred embodiment of the present invention. FIG. 5 is a schematic view of a measurement modified magnetic flux according to a preferred embodiment of the present invention when a conductive object approaches a probe. The magnitude of the sensor's received signal at room temperature in the presence of some typical blast furnace feeds. 1 is a schematic view of a blast furnace with two probes (one movable probe and one fixed probe) each with a sensor for determining the raw material distribution. It is the schematic of the determined raw material distribution in a blast furnace.

  A schematic configuration of a measurement probe 2 according to a particularly preferred embodiment of the present invention is shown in FIG. The measurement probe 2 can determine the type of the raw material of the charge in the blast furnace through the electrical conductivity without direct contact between the sensor, that is, the transmission coil 4 and the reception coil 6 and the charge 14. . Numerous measurements in the horizontal and / or vertical dimensions make it possible to determine the feed distribution in the blast furnace charge.

  The protective shell 8 is made of a ceramic material that withstands harsh conditions, in particular temperature changes and forces from charges and friction in the blast furnace. The protective shell 8 has a thickness in the range of 10-25 mm. Ceramic materials are harder than blast furnace charges and can withstand wear during long operating times. Since the measurements are performed during blast furnace operation, the ceramic protective shell 8 prevents damage to the transmit coil 4 and the receive coil 6 when the probe is inserted into or moved through the charge.

  The measurement probe 2 includes a transmission coil 4 and a reception coil 6. During operation, the transmitting coil 4 generates a primary alternating magnetic field and the receiving coil 6 receives the alternating magnetic field. The transmission coil 4 and the reception coil 6 are directly disposed on the protective shell 8. The probe has a length of about 5 m for a movable probe and about 1 m for a fixed probe. The sensor is disposed near the tip of the probe so that the sensor can be inserted into the blast furnace. The transmission coil 4 and the reception coil 6 are electrically connected to an evaluation and control unit 10 located outside the blast furnace by a conductive wire (not shown).

When the measurement probe 2 of FIG. 1 is viewed from above, the transmitter coil 4 and the receiver coil 6 have a circular shape and are separated from the charge 14 by the protective shell 8. The transmission coil 4 and the reception coil 6 are arranged so that their magnetic fields are concentric. The surface of the transmission coil 4 is between 1 to 20 cm ^2, the surface of the receiving coil 6 is between 5 to 50 cm ^2. Therefore, the ratio of the surfaces of the two coils (transmitting coil: receiving coil) is between 1: 1 and 1:50.

  The measuring range, ie the volume of raw material to be measured, can be adapted by changing some of the parameters for generating and receiving an alternating magnetic field. The frequency of the signal applied to the transmission coil 4 can be increased or decreased, and / or the surface of the transmission coil 4 and / or the reception coil 6 can be increased or decreased. The measurement volume of the alternating magnetic field can be reduced, enlarged or adjusted accordingly. In this particular preferred embodiment of the invention, the measured volume roughly corresponds to an elliptical hemisphere.

  The surface of the receiving coil 6 is selected so that the raw material distribution of the charge can be determined via a protective shell disposed between the charge 14 and the measurement sensor. The minimum distance between the charge 14 and the coils 4, 6 is determined by the thickness of the protective shell. If the sensitivity is not sufficient, the surface of the receiving coil 6 must be enlarged or the thickness of the shell must be reduced.

  In order to improve the determination of the material distribution in the blast furnace, a plurality of sensors can be arranged in parallel near the tip of the probe. Since eddy currents are only local effects, they do not interfere with eddy currents induced by other coils 104a, 104b, 104c, or 104d if the system design is appropriate. In order to increase local resolution, the type of raw material is detected at several locations simultaneously. As a result, the number of measurement signals and measurement resolution can be increased and designed as desired. In FIG. 2, the protective shell 8 is an annular cylinder in which four sensors are arranged. The measurement volume of each individual sensor covers approximately a quarter of the outer circumference of the cylinder. In this particular embodiment, when an annular cylinder is placed at the tip of a horizontal probe, there are one measurement spot at the top, two at the center, and one at the bottom. The type of raw material is detected at three different vertical positions, which contributes to a three times higher vertical measurement resolution compared to a probe with only one measurement sensor.

  The transmission coils 104a, 104b, 104c, and 104d in FIG. 2 and the transmission coil 4 in FIG. 1 are operatively connected to the AC power source 12 shown in FIG. During operation, the alternating current applied to the transmit coil emits a primary alternating magnetic field 16 as shown in FIGS. To obtain accurate measurements and good results, an alternating current with a frequency of about 2 MHz and a size of about 5 mA is applied.

  In FIG. 3, the conductive material is not brought into the range of the primary AC magnetic field 16, eddy current is not induced in the conductive material, and no secondary AC magnetic field is generated. Before the resistance of the conductive material can be measured, the conductive object must be in the range of the primary alternating magnetic field 16 before it can be measured. The primary alternating magnetic field 16 is limited, among other things, by the size and shape of the transmitter coil 4.

  In FIG. 4, the charge 14 is brought into the primary AC magnetic field 16. The primary alternating magnetic field 16 of FIG. 5 induces eddy currents 18 in the charge 14. The induced eddy current 18 generates a secondary alternating magnetic field 20. The control and evaluation unit 10 evaluates the measured values based on the primary AC magnetic field 16 and the secondary AC magnetic field 20 measured by the receiving coil 6. The amount of current in the receiving coil 6 indicates the electrical resistance of the charge 14.

  FIG. 5 presents the current output of the receiving coil. When the charge 14 is an ore, or when there is no charge, the measured current in the receiving coil 6 is 5 mA or more. When coke is present in the primary alternating magnetic field, the current in the receiving coil is lower than 5 mA, typically about 10% lower than in the absence of raw material, and thus as low as 4.5 mA.

  In order to detect the type of raw material, the current in the receiving coil is compared with a threshold 24. In this particular preferred embodiment of the invention, the threshold 24 is set to 4.9 mA. One skilled in the art can adjust the threshold 24 as needed. This is usually done during calibration. In order to calibrate the measuring probe, there is no conductive object in the primary AC magnetic field 16, but AC current is applied to the AC transmitter coil 4 when coke dust is present. This leads to a calibration value 22. In order to take measurement noise into account and prevent the influence of dust, the threshold 24 is defined slightly lower. Each change in the receive coil current below the threshold 24 indicates the presence of a conductive charge 14 in the primary alternating magnetic field 16.

  In particular, the current in the receiving coil 6 is a function of the conductivity of the charge 14. Conductivity is a reliable characteristic over the entire temperature range in the blast furnace. It is therefore suitable as a property for determining the raw material distribution. The system is designed to have a good response to conductivity. To a lesser extent, the secondary AC magnetic field 20 depends on the permeability of the charge 14 at a temperature below the Curie point. The effect of permeability is about + 2% or less from the calibration value of 22. This effect is not significant since the measurement signal in the presence of coke is between calibration values 22 and 0-10%. Changes in temperature or constant flux do not affect the measured value. Small coke and dust particles have no noticeable effect on the measurements.

  To perform the measurement, the probe shown in FIG. 6 is inserted into the blast furnace. In this blast furnace, not only a movable probe but also a fixed probe is used to determine the raw material distribution in the blast furnace. In the following, only the principle of the movable probe will be described. At least one sensor 2 is disposed in the vicinity of the tip of the measurement probe that can move in the horizontal direction. The probe is inserted into a blast furnace having a diameter of about 10 m. Measurements are made about 4 m below the surface of the charge, typically in the area before the raw material begins to soften. It takes about 50 seconds to move from the blast furnace shell to the center of the blast furnace and return to the blast furnace shell. High-speed horizontal movement is sequentially repeated. At the same time, the charge is lowered slowly but at a rate of about 12 cm / min.

  The measurement signal is continuously recorded everywhere and compared with a threshold 24. In this way, an image of the raw material distribution as shown in FIG. 7 is obtained. Data received from the sensor 2 is arranged in an xy graph where the x-axis represents the blast furnace radius and the y-axis represents the height of the blast furnace. The pixels in FIG. 7 correspond to the measured raw material distribution in the blast furnace. Each pixel represents a range of about 10 cm × 10 cm of the charge. From the blast furnace center to a radius of 1.3 m, it can be clearly recognized that only the coke 26 exists. The process gas can basically pass up through the coke 26 along the central chimney, but is difficult to pass through the ore-like charge 28 layer. This is the central chimney for the process gas escaping upwards. Furthermore, the (each) layer is arranged so that the process gas can come into contact with the bottom of the ore-like raw material layer.

  Furthermore, it is possible to apply a signal processing method that extracts more information from the raw measurement signal. For example, instead of simply discriminating between coke and ore-like raw material, raw material mixture values can be obtained during rasterization into pixels. Furthermore, information on the coke particle size can be extracted from the fluctuation of the received current amount signal.

  The temperature at which the feed distribution is measured in this particular preferred embodiment of the present invention ranges from about 100 ° C. near the blast furnace wall to 900 ° C. or higher at the blast furnace center. Especially in the central chimney of the blast furnace with an inner diameter (inner radius) of up to 1 m, the temperature reaches an extreme peak. On the other hand, the size of the chimney is one of the main information obtained as a result of the measurement. For typical iron ores used in blast furnaces, the Curie point is well below these temperatures. The magnetic properties that discriminate ore-like raw materials from coke disappear. However, the measurement is based on conductivity, and the coke conductivity is not compromised at the current temperature, so the material distribution is at the Curie point, above, or below the temperature below the melting point of the material. Determined by

  Finally, the blast furnace charging chute material distribution program is adjusted according to the desired material distribution. If an undesirable feed distribution is determined, the feed chute feed distribution program is modified. The goal is to increase blast furnace efficiency, productivity, and lifetime by optimizing the charging.

2 Probe (probe, probe)
4 Transmitting coil 6 Receiving coil 8 Protective shell 10 Evaluation and control unit 12 AC power supply 14 Conductive charge 16 Primary AC magnetic field 18 Eddy current 20 Secondary AC magnetic field 22 Signal level in the absence of an object 24 Coke detection Signal level threshold 26 Coke raw material 28 Ore-like material
108 Protective shell 104a, 104b, 104c, 104d Transmitting coil 106a, 106b, 106c, 106d Receiving coil

Claims (13)

A measurement probe for determining a raw material distribution inside a charge containing iron ore and coke in a blast furnace,
At least one sensor comprising a transmission coil having a transmission surface and a reception coil having a reception surface;
A protective shell containing the at least one sensor;
Said transmission coil, an AC power source for applying an alternating current having an amplitude of frequency Contact and 1~10mA of 0.5～5MHz,
The transmitter coil emits a primary alternating magnetic field, the primary alternating magnetic field induces eddy currents in the conductive material of the charge in the primary alternating magnetic field;
The eddy current generates a secondary AC magnetic field, and the receiver coil measures the current generated by the primary AC magnetic field and the secondary AC magnetic field;
A control and evaluation unit for evaluating the measured current, wherein the current indicates the raw material distribution of the charge in the blast furnace,
Measuring probe with.   The measurement probe according to claim 1, wherein the at least one sensor is disposed on a support inside the protective shell.   The measurement probe according to claim 1, wherein the protective shell includes a ceramic material.   The measurement probe according to claim 1, wherein the magnetic field of the reception coil is concentric with the magnetic field of the transmission coil.   The measurement probe according to claim 1, wherein the protective shell is a substantially annular cylindrical body or flat plate having a thickness of 10 to 25 mm. The measurement probe according to claim 1, wherein the transmission coil has a transmission surface of 1 to 20 cm ² . The measurement probe according to claim 1, wherein the reception coil has a reception surface of 5 to 50 cm ² .   The measurement probe according to claim 1, comprising a plurality of sensors.   The measurement probe according to claim 1, wherein the coil has an elliptical shape, a circular shape, or a rectangular shape. A method for determining a raw material distribution of charges including iron ore and coke inside a blast furnace,
Inserting a measuring probe into the blast furnace charge, the measuring probe having a sensor having a receiving coil and a transmitting coil, the sensor being housed inside a protective shell; and
Wherein such primary alternating magnetic field is generated by the transmitter coil, the transmitter coil, comprising the steps of applying an alternating current having an amplitude of frequency Contact and 1~10mA of 0.5～5MHz, the primary alternating magnetic field wherein Applying an eddy current to the conductive material of the charge, wherein the eddy current generates a secondary alternating magnetic field;
Measuring a current generated by the primary alternating magnetic field and the secondary alternating magnetic field with a receiving coil;
Evaluating the raw material distribution of the charge based on the current;
A method comprising. The method of claim 10 , wherein the assessment of the feed distribution is used to control a distribution chute of the blast furnace. The method according to claim 10 or 11 , wherein the measurement probe moves in a horizontal direction into the charge of the blast furnace. The method according to claim 10 or 11 , wherein the measurement probe is fixedly disposed below the surface of the charge in the blast furnace.

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