CA2383538A1 - Method for determining the trajectory of materials when charging a shaft kiln - Google Patents
Method for determining the trajectory of materials when charging a shaft kiln Download PDFInfo
- Publication number
- CA2383538A1 CA2383538A1 CA002383538A CA2383538A CA2383538A1 CA 2383538 A1 CA2383538 A1 CA 2383538A1 CA 002383538 A CA002383538 A CA 002383538A CA 2383538 A CA2383538 A CA 2383538A CA 2383538 A1 CA2383538 A1 CA 2383538A1
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- Prior art keywords
- probe
- chamber
- materials
- kiln
- abovementioned
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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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D21/00—Arrangements of monitoring devices; Arrangements of safety devices
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Blast Furnaces (AREA)
- Portable Nailing Machines And Staplers (AREA)
- Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
Abstract
The invention concerns a method using a probe whereof the part inside the chamber of said kiln is not provided with sensors. The method consists in associating to the part of the probe outside the kiln chamber a sensor sensitive to the impact of materials charged over part of the probe introduced in the kiln chamber and in observing a signal generated by said sensor in connection with the part of the probe outside the chamber; moving the probe head inside the kiln chamber and in recording the observed signal as the probe moves; plotting curves whereon can be read the width of the flux of materials, the centre of gravity of said flux and the density of materials poured along a direction coinciding with the trajectory of the moving probe head.
Description
Process for determining the trajectory of materials when loading a shaft kiln Technical field The present invention relates to a process for determining the trajectory of materials when loading a shaft kiln, more particularly when loading using a rotary chute.
Prior art By way of simple illustration, the description that follows refers more particularly to a blast furnace for producing cast iron. However, it is understood that the invention also applies to any machinery, generally referred to as a shaft kiln, which is equipped with a loading system similar to that of a blast furnace.
It is known that the charge of a blast furnace consists of superimposed layers, alternately composed of ore and fuel.
The term "ore" means iron-containing materials, generally prepared as aggregates or pellets, and which may contain various other substances, especially fluxes. The term "fuel" means carbon-containing materials, essentially composed of coke.
The ore and the fuel are loaded alternately into the furnace, so as to form alternate layers height-wise in the said furnace. This method of loading, and also the radial distribution of the materials in the section of the blast furnace, are essential for the correct functioning of the said furnace. It is consequently also important to be able to control and adjust this distribution of the materials.
Currently, the loading of a blast furnace is increasingly carried out using an installation comprising a rotary chute, rotating about the vertical axis of the furnace, which distributes the granular materials in a spiral at the top of the furnace. In a vertical plane, this chute forms with the axis of the furnace a variable angle, known as a, which has an influence on the trajectory of the loaded materials and which is modified according to the desired charge distribution.
However, in practice, it is not possible with this device to ensure that the desired distribution is in fact achieved, and consequently to correct any anomalies in this distribution.
Knowing the trajectories of the materials falling from the chute of the blast furnace throat, for example of Paul Wurth type, is thus important for correct control of the charge distribution of the blast furnace, and makes it possible to achieve a distribution of the gases promoting the operations that take place therein.
Mathematical models of the distribution of the-charge in a blast furnace have been developed in order to facilitate the choice of the loading sequences. The drop trajectories of the materials, for each angular position a of the chute, are obviously important items of data for these models.
In addition, these trajectories change over time, be it only due to the wear of the coating on the chute, this being a phenomenon that it is necessary to take into account in order to arrive at the best estimate of the change in the trajectories over time.
At the current time, only frequent measurements can ensure the supply of information necessary to improve the control of the charge distribution. However, these measurements, which are currently performed during scheduled stoppages of the shaft kiln, that is to say approximately every four months, are laborious and are not sufficiently numerous to allow a precise determination of the charge distribution.
Furthermore, the number of possible measurements during these stoppages is limited by the available volume above the charge during the stoppage and by the limited stoppage time of the blast furnace. Finally, these measurements do not take into account the influence of the ascending flow rate of gases existing during the normal running of the blast furnace, since they are performed during stoppages of functioning of the said blast furnace.
It would therefore be very useful to have available a method for continuously measuring the drop trajectory of the materials at the blast furnace throat during the normal functioning of the blast furnace, and which automatically takes account of the change over time of the parameters defining the working conditions of the loading system.
Furthermore, independently of the wear of the chute coating, the trajectories change for various reasons associated with the charge itself, especially including:
- the particle size distribution of the charge which fluctuates and gives rise to variations in the trajectories, these variations needing to be detected and compensated for so as to maintain the desired charge distribution;
- the amount of material in the chute feed hopper which has an influence on the trajectory of the said materials exiting therefrom;
- a variable particle size segregation depending on whether the hopper feeding the chute is full or virtually empty.
Amended page 4 It is incontrovertible that the abovementioned methods provide valuable information for determining the trajectory of the loaded materials. However, it will be noted that the Amended page 5 use~of sensors actually inside the kiln has the drawback~of imposing a choice of material that is capable of withstanding the harsh operating conditions prevailing therein. This immediately entails an increase in the costs of production and thus also of exploitation of the said probes, which constitutes a major curb on their implementation on an industrial scale.
Document JP-A-61 009 507 describes a process for determining the distribution of a blast furnace charge, in order to make this distribution uniform and to stabilize the running of the blast furnace. The process uses a plurality of probes (12, 13) placed radially in the throat of the blast furnace, the said furnace being fed by means of a rotary chute positioned on its central axis. The principle consists in measuring the vibrations to which the said probes are subjected during contact with the loading materials. The vibrations at each probe are measured by . vibration detectors (10, 11) placed outside the blast furnace. The probes are fixed during the measurements. This process only allows a precise determination of the positions at the start and end of loading and thus of the duration of loading. It is also expensive due to the use of a large number of probes.
Presentation of the invention The object of the present invention is to propose a process for determining the drop traj ectories of loaded materials, so as to take into account any modifications thereof and to ensure an optimum distribution of these materials in the various layers.
The process of the present invention falls in the context of using a probe placed radially in the furnace.
Amended page 6 The- present invention.relates to a process for' determining the trajectory of materials when loading a shaft kiln, preferably a blast furnace, in which the materials (7) constituting the charge are poured in, via a feed means, preferably a rotary chute positioned on the central axis of the said shaft kiln, from the top of the said shaft kiln, in which:
- an elongated component known as a probe (2) is used, which is partially introduced lengthwise into the chamber of the said shaft kiln, the end of the probe introduced into the chamber and the end of the probe located outside the said chamber being conventionally referred to as the head (3) and tail (5) of the probe, respectively, the said probe being of the inert type at least in the portion inside the chamber of the said kiln, that is to say that it lacks sensors, - the, portion of the probe which is outside the kiln chamber is combined with at least one component, conventionally referred to as a sensor (6), which is sensitive to the impact of the loaded materials (7) on the portion of the probe introduced into the kiln chamber, and - at least one signal generated by the said sensor (6) connected to the portion of the probe outside the abovementioned chamber is observed characterized in that the head of the probe is displaced, preferably continuously, inside the kiln chamber and in that the signal generated by the sensor during the abovementioned displacement is recorded over time.
It is obvious that the very fact that the portion of the probe which is introduced into the chamber is inert, and thus lacks sensors, and therefore has no connections or components liable to degrade under the working conditions inside the kiln chamber, has the effect, firstly, of Amended page 7 solving certain practical assembly problems by~~virtue.of .
the absence of fragile components, and, secondly, of ensuring increased reliability and an increased service life, resulting in a reduction in both the production costs and the implementation costs.
According to one embodiment of the process of the present invention, the head of the probe is displaced inside the kiln chamber; preferably, on the one hand, the displacement is continuous and/or rectilinear in a radial plane of the chamber, optionally in a horizontal plane, and, on the other hand, in the case of a chamber of circular cross section, limited between the inner wall of the chamber and the geometrical centre of the said chamber, and the signal observed during the abovementioned displacement is recorded.
The preceding embodiment makes it possible, when the process is applied to a blast furnace, to plot certain points in the trajectory of the loaded materials by moving the probe along a radius of the chamber, which is, incidentally, often in a horizontal plane, and, by recording these data over time, to extrapolate therefrom for the entire cross section of the chamber information that may be subsequently exploited regarding the actual distribution of the materials being-loaded in the kiln as a whole.
According to another embodiment of the process of the present invention, the intensity of the said observed signal is analysed from when the head of the probe first comes into contact with the flux of materials poured in, up to the moment at which the head of the probe reaches its position of displacement that is furthest from the wall of Amended page 8 the chamber,-~the overall operation of contact and of end s~f displacement of the head of the probe being materialized on the curve representing the observed signal by an increase in the signal which is proportional to the impact of the said materials on the probe According to one preferred embodiment of the process of the present invention, in which the chamber is that of a blast furnace into which the materials (7) are loaded by means of a rotary chute positioned on the central axis of the said blast furnace, the head (3) of a probe (2) is introduced into the blast furnace through an orifice made in the wall (1) of the said blast furnace, the said probe (2) coming to bear at a ffirst point (4) located in the wall (1) of the chamber or at least close to the said chamber, and at a second point outside the blast furnace chamber, preferably located at the tail (3) of the probe (2), the said probe (2) being of elongated shape, preferably of cylindrical cross section, and equipped at (5) with a sensor (6) that is sensitive to the impact on the probe (2) of the materials (7) poured via the abovementioned rotary chute, the head (3) of the probe (2) is displaced in the chamber from a position a up to a position d, preferably in a substantially radial and horizontal direction, the signal emitted by the sensor (6) is recorded as a function of time, the said recorded signal is combined with the parameters defining at the same instant the working position of the rotary chute, preferably, at least the angle a relative to the said chute is combined, that is to say the angle that this chute forms in a vertical plane with the axis of the kiln, and curves A and B are deduced therefrom, it is found that curve A undergoes a continuous increase from the point of displacement (a) of the probe (2), that is to say from where the head (3) first comes into contact with the flux of materials (7) poured in via the rotary chute, up to the point (b) , that is to say the point at which the head (3) comes out of the abovementioned flux, and then the said curve A is substantially flat between the abovementioned point (b) and the point (d), that is to say the end of the course of the displacement of the head (3), using curve A, curve B is calculated, on which is determined the width (a-b) of the flux of materials, the centre of gravity (c) of the said flux and the density of materials (7) poured in along a direction (a-d) coinciding with the path of displacement of the head 5 ( 3 ) of the probe ( 2 ) .
According to yet another embodiment of the process of the present invention, the portion of the probe outside the kiln chamber is combined with at least two sensors, sensors 10 of at least two different types are selected, for example one sensitive to the vibrations generated in the probe and another sensitive to the forces exerted on the probe, the signals obtained from the said sensors are observed and the trajectory of the materials is determined by combining the information supplied by the signals obtained from each of the abovementioned sensors.
The present invention also relates to a device for carrying out the process that is the subj ect matter of the present invention.
The device for carrying out the process of the present invention is characterized in that it comprises a probe consisting mainly, at least in the portion that enters the kiln chamber, of a metallic component, preferably of regular or irregular polygonal or circular cross section.
According to one embodiment of the device for carrying out the process of the present invention, the metallic component is composed of several assembled constituent components, preferably either tubes or profiles of regular or irregular cross section; optionally, the tubes or profiles are chosen with a suitable cross section so as to be able to slide one inside the other.
According to another embodiment of the'device for carrying out the process of the present invention, the portion of the probe outside the chamber comprises at least one sensor; preferably this or these sensors) is (are) of the strain gauge or force sensor or vibration detector type, and it optionally comprises at least two different types of sensor.
The process of the present invention constitutes a novel and simpler approach to the problem of determining the distribution of the charge in a shaft kiln as a practical implementation, since it does not use a network of sensors arranged along the probe and thus located inside the kiln chamber, but, on the contrary, one or more sensors located outside the said chamber, and thus less subject to stress during functioning, which constitutes an appreciable advantage in terms of construction and service life.
Furthermore, the process of the present invention makes it possible to obtain information regarding the width of the flux of materials falling from the chute, and also its local density, such data currently being obtained with difficulty by investing in a number of probes whose overall cost would economically penalize the running costs of the shaft kiln.
Prior art By way of simple illustration, the description that follows refers more particularly to a blast furnace for producing cast iron. However, it is understood that the invention also applies to any machinery, generally referred to as a shaft kiln, which is equipped with a loading system similar to that of a blast furnace.
It is known that the charge of a blast furnace consists of superimposed layers, alternately composed of ore and fuel.
The term "ore" means iron-containing materials, generally prepared as aggregates or pellets, and which may contain various other substances, especially fluxes. The term "fuel" means carbon-containing materials, essentially composed of coke.
The ore and the fuel are loaded alternately into the furnace, so as to form alternate layers height-wise in the said furnace. This method of loading, and also the radial distribution of the materials in the section of the blast furnace, are essential for the correct functioning of the said furnace. It is consequently also important to be able to control and adjust this distribution of the materials.
Currently, the loading of a blast furnace is increasingly carried out using an installation comprising a rotary chute, rotating about the vertical axis of the furnace, which distributes the granular materials in a spiral at the top of the furnace. In a vertical plane, this chute forms with the axis of the furnace a variable angle, known as a, which has an influence on the trajectory of the loaded materials and which is modified according to the desired charge distribution.
However, in practice, it is not possible with this device to ensure that the desired distribution is in fact achieved, and consequently to correct any anomalies in this distribution.
Knowing the trajectories of the materials falling from the chute of the blast furnace throat, for example of Paul Wurth type, is thus important for correct control of the charge distribution of the blast furnace, and makes it possible to achieve a distribution of the gases promoting the operations that take place therein.
Mathematical models of the distribution of the-charge in a blast furnace have been developed in order to facilitate the choice of the loading sequences. The drop trajectories of the materials, for each angular position a of the chute, are obviously important items of data for these models.
In addition, these trajectories change over time, be it only due to the wear of the coating on the chute, this being a phenomenon that it is necessary to take into account in order to arrive at the best estimate of the change in the trajectories over time.
At the current time, only frequent measurements can ensure the supply of information necessary to improve the control of the charge distribution. However, these measurements, which are currently performed during scheduled stoppages of the shaft kiln, that is to say approximately every four months, are laborious and are not sufficiently numerous to allow a precise determination of the charge distribution.
Furthermore, the number of possible measurements during these stoppages is limited by the available volume above the charge during the stoppage and by the limited stoppage time of the blast furnace. Finally, these measurements do not take into account the influence of the ascending flow rate of gases existing during the normal running of the blast furnace, since they are performed during stoppages of functioning of the said blast furnace.
It would therefore be very useful to have available a method for continuously measuring the drop trajectory of the materials at the blast furnace throat during the normal functioning of the blast furnace, and which automatically takes account of the change over time of the parameters defining the working conditions of the loading system.
Furthermore, independently of the wear of the chute coating, the trajectories change for various reasons associated with the charge itself, especially including:
- the particle size distribution of the charge which fluctuates and gives rise to variations in the trajectories, these variations needing to be detected and compensated for so as to maintain the desired charge distribution;
- the amount of material in the chute feed hopper which has an influence on the trajectory of the said materials exiting therefrom;
- a variable particle size segregation depending on whether the hopper feeding the chute is full or virtually empty.
Amended page 4 It is incontrovertible that the abovementioned methods provide valuable information for determining the trajectory of the loaded materials. However, it will be noted that the Amended page 5 use~of sensors actually inside the kiln has the drawback~of imposing a choice of material that is capable of withstanding the harsh operating conditions prevailing therein. This immediately entails an increase in the costs of production and thus also of exploitation of the said probes, which constitutes a major curb on their implementation on an industrial scale.
Document JP-A-61 009 507 describes a process for determining the distribution of a blast furnace charge, in order to make this distribution uniform and to stabilize the running of the blast furnace. The process uses a plurality of probes (12, 13) placed radially in the throat of the blast furnace, the said furnace being fed by means of a rotary chute positioned on its central axis. The principle consists in measuring the vibrations to which the said probes are subjected during contact with the loading materials. The vibrations at each probe are measured by . vibration detectors (10, 11) placed outside the blast furnace. The probes are fixed during the measurements. This process only allows a precise determination of the positions at the start and end of loading and thus of the duration of loading. It is also expensive due to the use of a large number of probes.
Presentation of the invention The object of the present invention is to propose a process for determining the drop traj ectories of loaded materials, so as to take into account any modifications thereof and to ensure an optimum distribution of these materials in the various layers.
The process of the present invention falls in the context of using a probe placed radially in the furnace.
Amended page 6 The- present invention.relates to a process for' determining the trajectory of materials when loading a shaft kiln, preferably a blast furnace, in which the materials (7) constituting the charge are poured in, via a feed means, preferably a rotary chute positioned on the central axis of the said shaft kiln, from the top of the said shaft kiln, in which:
- an elongated component known as a probe (2) is used, which is partially introduced lengthwise into the chamber of the said shaft kiln, the end of the probe introduced into the chamber and the end of the probe located outside the said chamber being conventionally referred to as the head (3) and tail (5) of the probe, respectively, the said probe being of the inert type at least in the portion inside the chamber of the said kiln, that is to say that it lacks sensors, - the, portion of the probe which is outside the kiln chamber is combined with at least one component, conventionally referred to as a sensor (6), which is sensitive to the impact of the loaded materials (7) on the portion of the probe introduced into the kiln chamber, and - at least one signal generated by the said sensor (6) connected to the portion of the probe outside the abovementioned chamber is observed characterized in that the head of the probe is displaced, preferably continuously, inside the kiln chamber and in that the signal generated by the sensor during the abovementioned displacement is recorded over time.
It is obvious that the very fact that the portion of the probe which is introduced into the chamber is inert, and thus lacks sensors, and therefore has no connections or components liable to degrade under the working conditions inside the kiln chamber, has the effect, firstly, of Amended page 7 solving certain practical assembly problems by~~virtue.of .
the absence of fragile components, and, secondly, of ensuring increased reliability and an increased service life, resulting in a reduction in both the production costs and the implementation costs.
According to one embodiment of the process of the present invention, the head of the probe is displaced inside the kiln chamber; preferably, on the one hand, the displacement is continuous and/or rectilinear in a radial plane of the chamber, optionally in a horizontal plane, and, on the other hand, in the case of a chamber of circular cross section, limited between the inner wall of the chamber and the geometrical centre of the said chamber, and the signal observed during the abovementioned displacement is recorded.
The preceding embodiment makes it possible, when the process is applied to a blast furnace, to plot certain points in the trajectory of the loaded materials by moving the probe along a radius of the chamber, which is, incidentally, often in a horizontal plane, and, by recording these data over time, to extrapolate therefrom for the entire cross section of the chamber information that may be subsequently exploited regarding the actual distribution of the materials being-loaded in the kiln as a whole.
According to another embodiment of the process of the present invention, the intensity of the said observed signal is analysed from when the head of the probe first comes into contact with the flux of materials poured in, up to the moment at which the head of the probe reaches its position of displacement that is furthest from the wall of Amended page 8 the chamber,-~the overall operation of contact and of end s~f displacement of the head of the probe being materialized on the curve representing the observed signal by an increase in the signal which is proportional to the impact of the said materials on the probe According to one preferred embodiment of the process of the present invention, in which the chamber is that of a blast furnace into which the materials (7) are loaded by means of a rotary chute positioned on the central axis of the said blast furnace, the head (3) of a probe (2) is introduced into the blast furnace through an orifice made in the wall (1) of the said blast furnace, the said probe (2) coming to bear at a ffirst point (4) located in the wall (1) of the chamber or at least close to the said chamber, and at a second point outside the blast furnace chamber, preferably located at the tail (3) of the probe (2), the said probe (2) being of elongated shape, preferably of cylindrical cross section, and equipped at (5) with a sensor (6) that is sensitive to the impact on the probe (2) of the materials (7) poured via the abovementioned rotary chute, the head (3) of the probe (2) is displaced in the chamber from a position a up to a position d, preferably in a substantially radial and horizontal direction, the signal emitted by the sensor (6) is recorded as a function of time, the said recorded signal is combined with the parameters defining at the same instant the working position of the rotary chute, preferably, at least the angle a relative to the said chute is combined, that is to say the angle that this chute forms in a vertical plane with the axis of the kiln, and curves A and B are deduced therefrom, it is found that curve A undergoes a continuous increase from the point of displacement (a) of the probe (2), that is to say from where the head (3) first comes into contact with the flux of materials (7) poured in via the rotary chute, up to the point (b) , that is to say the point at which the head (3) comes out of the abovementioned flux, and then the said curve A is substantially flat between the abovementioned point (b) and the point (d), that is to say the end of the course of the displacement of the head (3), using curve A, curve B is calculated, on which is determined the width (a-b) of the flux of materials, the centre of gravity (c) of the said flux and the density of materials (7) poured in along a direction (a-d) coinciding with the path of displacement of the head 5 ( 3 ) of the probe ( 2 ) .
According to yet another embodiment of the process of the present invention, the portion of the probe outside the kiln chamber is combined with at least two sensors, sensors 10 of at least two different types are selected, for example one sensitive to the vibrations generated in the probe and another sensitive to the forces exerted on the probe, the signals obtained from the said sensors are observed and the trajectory of the materials is determined by combining the information supplied by the signals obtained from each of the abovementioned sensors.
The present invention also relates to a device for carrying out the process that is the subj ect matter of the present invention.
The device for carrying out the process of the present invention is characterized in that it comprises a probe consisting mainly, at least in the portion that enters the kiln chamber, of a metallic component, preferably of regular or irregular polygonal or circular cross section.
According to one embodiment of the device for carrying out the process of the present invention, the metallic component is composed of several assembled constituent components, preferably either tubes or profiles of regular or irregular cross section; optionally, the tubes or profiles are chosen with a suitable cross section so as to be able to slide one inside the other.
According to another embodiment of the'device for carrying out the process of the present invention, the portion of the probe outside the chamber comprises at least one sensor; preferably this or these sensors) is (are) of the strain gauge or force sensor or vibration detector type, and it optionally comprises at least two different types of sensor.
The process of the present invention constitutes a novel and simpler approach to the problem of determining the distribution of the charge in a shaft kiln as a practical implementation, since it does not use a network of sensors arranged along the probe and thus located inside the kiln chamber, but, on the contrary, one or more sensors located outside the said chamber, and thus less subject to stress during functioning, which constitutes an appreciable advantage in terms of construction and service life.
Furthermore, the process of the present invention makes it possible to obtain information regarding the width of the flux of materials falling from the chute, and also its local density, such data currently being obtained with difficulty by investing in a number of probes whose overall cost would economically penalize the running costs of the shaft kiln.
Claims (15)
1. Process for determining the trajectory of materials when loading a shaft kiln, preferably a blast furnace, in which the materials (7) constituting the charge are poured in, via a feed means, preferably a rotary chute positioned on the central axis of the said shaft kiln, from the top of the said shaft kiln, in which:
- an elongated component known as a probe (2) is used, which is partially introduced lengthwise into the chamber of the said shaft kiln, the end of the probe introduced into the chamber and the end of the probe located outside the said chamber being conventionally referred to as the head (3) and tail (5) of the probe, respectively, the said probe being of the inert type at least in the portion inside the chamber of the said kiln, that is to say that it lacks sensors, - the portion of the probe which is outside the kiln chamber is combined with at least one component, conventionally referred to as a sensor (6), which is sensitive to the impact of the loaded materials (7) on the portion of the probe introduced into the kiln chamber, and - at least one signal generated by the said sensor (6) connected to the portion of the probe outside the abovementioned chamber is observed characterized in that the head of the probe is displaced, preferably continuously, inside the kiln chamber and in that the signal generated by the sensor during the abovementioned displacement is recorded over time.
- an elongated component known as a probe (2) is used, which is partially introduced lengthwise into the chamber of the said shaft kiln, the end of the probe introduced into the chamber and the end of the probe located outside the said chamber being conventionally referred to as the head (3) and tail (5) of the probe, respectively, the said probe being of the inert type at least in the portion inside the chamber of the said kiln, that is to say that it lacks sensors, - the portion of the probe which is outside the kiln chamber is combined with at least one component, conventionally referred to as a sensor (6), which is sensitive to the impact of the loaded materials (7) on the portion of the probe introduced into the kiln chamber, and - at least one signal generated by the said sensor (6) connected to the portion of the probe outside the abovementioned chamber is observed characterized in that the head of the probe is displaced, preferably continuously, inside the kiln chamber and in that the signal generated by the sensor during the abovementioned displacement is recorded over time.
2. Process according to Claim 1, characterized in that the displacement is continuous along a radial plane of the chamber.
3. Process according to Claim 1 or 2, characterized in that the displacement is carried out in a horizontal plane.
4. Process according to Claim 2 or 3, characterized in that the signal is recorded at certain points in the trajectory of the loaded materials and extrapolated for the entire cross section of the chamber, the said signal being able to be subsequently exploited to determine the actual distribution of the charge materials in the kiln as a whole.
5. Process according to any one of Claims 1 to 4, characterized in that the displacement is limited, in the case of a chamber of circular cross section, between the inner wall of the chamber and the geometrical centre of the said chamber.
6. Process according to any one of Claims 1 to 5, characterized by the following successive steps:
- the head (3) of a probe (2) is introduced into the said shaft kiln through an orifice made in the wall (1) of the said shaft kiln, - the said probe (2) comes to bear at a first point (4) located in the wall (1) of the chamber or at least close to the said chamber, and at a second point outside the shaft kiln chamber, the said probe (2) being of elongated shape and equipped at its tail (5) with a sensor (6) that is sensitive to the impact on the probe (2) of the materials (7) poured via the abovementioned feed chute, preferably the abovementioned rotary chute, - the head (3) of the probe (2) is displaced in the chamber from a point (a) up to a point (d) and the signal emitted by the sensor (6) is recorded as a function of time, - the said recorded signal is combined with the parameters defining at the same instant the working position of the abovementioned feed means, preferably the abovementioned rotary chute, - curves (A) and (B) are deduced therefrom, - it is found that curve (A) undergoes a continuous increase from the point of displacement (a) of the probe (2), that is to say from where the head (3) first comes into contact with the flux of materials (7) poured in via the abovementioned feed means, preferably the abovementioned rotary chute, up to the point (b), that is to say the point at which the head (3) comes out of the abovementioned flux, and then in that the said curve (A) is substantially flat between the abovementioned point (b) and point (d) , that is to say the point corresponding to the end of the course of the displacement of the head (3) , and - the width (a-b) of the flux of materials, the centre of gravity (c) of the said flux and the density of materials (7) poured in along a direction (a-d) coinciding with the path of displacement of the head (3) of the probe (2) are determined on curve (B), which is calculated from curve (A).
- the head (3) of a probe (2) is introduced into the said shaft kiln through an orifice made in the wall (1) of the said shaft kiln, - the said probe (2) comes to bear at a first point (4) located in the wall (1) of the chamber or at least close to the said chamber, and at a second point outside the shaft kiln chamber, the said probe (2) being of elongated shape and equipped at its tail (5) with a sensor (6) that is sensitive to the impact on the probe (2) of the materials (7) poured via the abovementioned feed chute, preferably the abovementioned rotary chute, - the head (3) of the probe (2) is displaced in the chamber from a point (a) up to a point (d) and the signal emitted by the sensor (6) is recorded as a function of time, - the said recorded signal is combined with the parameters defining at the same instant the working position of the abovementioned feed means, preferably the abovementioned rotary chute, - curves (A) and (B) are deduced therefrom, - it is found that curve (A) undergoes a continuous increase from the point of displacement (a) of the probe (2), that is to say from where the head (3) first comes into contact with the flux of materials (7) poured in via the abovementioned feed means, preferably the abovementioned rotary chute, up to the point (b), that is to say the point at which the head (3) comes out of the abovementioned flux, and then in that the said curve (A) is substantially flat between the abovementioned point (b) and point (d) , that is to say the point corresponding to the end of the course of the displacement of the head (3) , and - the width (a-b) of the flux of materials, the centre of gravity (c) of the said flux and the density of materials (7) poured in along a direction (a-d) coinciding with the path of displacement of the head (3) of the probe (2) are determined on curve (B), which is calculated from curve (A).
7. Process according to Claim 6, characterized in that the second bearing point is located at the tail (5) of the probe (2).
8. Process according to Claim 6 or 7, characterized in that the head (3) of the probe (2) is displaced in a substantially radial and horizontal direction.
9. Process according to any one of Claims 6 to 8, characterized in that the recorded signal and the angle (.alpha.) relative to the position of the chute are combined.
10. Process according to any one of the preceding claims, characterized in that at least two sensors are combined with the portion of the probe outside the kiln chamber, in that sensors of at least two different types are chosen, in that the signals obtained from the said sensors are observed, and in that the trajectory of the materials is determined by combining the information supplied by the abovementioned signals.
11. Device for carrying out the process according to any one of Claims 1 to 10, characterized in that it comprises at least one sensor combined with the outer portion of a probe.
12. Device according to Claim 11, characterized in that it comprises at least two different types of sensor combined with a probe.
13. Device according to Claim 11, characterized in that at least one of the sensors is of the strain gauge type.
14. Device according to Claim 11, characterized in that at least one of the sensors is of the force sensor type.
15. Device according to Claim 11, characterized in that at least one of the sensors is of the vibration detector type.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| BE9900622 | 1999-09-17 | ||
| BE9900622A BE1012905A3 (en) | 1999-09-17 | 1999-09-17 | Method for determining the path of materials when loading a shaft furnace. |
| PCT/BE2000/000098 WO2001021841A1 (en) | 1999-09-17 | 2000-08-30 | Method for determining the trajectory of materials when charging a shaft kiln |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2383538A1 true CA2383538A1 (en) | 2001-03-29 |
Family
ID=3892094
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002383538A Abandoned CA2383538A1 (en) | 1999-09-17 | 2000-08-30 | Method for determining the trajectory of materials when charging a shaft kiln |
Country Status (6)
| Country | Link |
|---|---|
| EP (1) | EP1212469A1 (en) |
| CN (1) | CN1375016A (en) |
| BE (1) | BE1012905A3 (en) |
| BR (1) | BR0014477A (en) |
| CA (1) | CA2383538A1 (en) |
| WO (1) | WO2001021841A1 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103834757A (en) * | 2014-02-26 | 2014-06-04 | 河北钢铁股份有限公司邯郸分公司 | Method and device for detecting accuracy of burden distribution of blast furnace |
| CN103911477B (en) * | 2014-04-10 | 2015-12-30 | 攀钢集团攀枝花钢铁研究院有限公司 | Measure the device and method without bell type-blast furnace material flow track |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6059007A (en) * | 1983-09-09 | 1985-04-05 | Sumitomo Metal Ind Ltd | Detection of behavior of raw material charged into blast furnace |
| JPS60145306A (en) * | 1984-01-07 | 1985-07-31 | Nippon Steel Corp | Detection of charging condition in vertical type blast furnace |
| JPH0623407B2 (en) * | 1984-06-26 | 1994-03-30 | 日本鋼管株式会社 | Bellless Blast Furnace Raw Material Input Position Measurement Method |
| JPH06117902A (en) * | 1992-10-06 | 1994-04-28 | Nippon Steel Corp | Device for detecting upper surface level of feed stock |
| LU90013B1 (en) * | 1997-01-29 | 1998-07-30 | Wurth Paul Sa | Device for direct observation of the loading process inside a shaft furnace |
| WO1999009219A1 (en) * | 1997-08-20 | 1999-02-25 | Moskovsky Institute Stali I Splavov (Tekhnologichesky Universitet) | Probe scanning system and built-in burden material defining sensor |
-
1999
- 1999-09-17 BE BE9900622A patent/BE1012905A3/en not_active IP Right Cessation
-
2000
- 2000-08-30 CN CN 00812960 patent/CN1375016A/en active Pending
- 2000-08-30 CA CA002383538A patent/CA2383538A1/en not_active Abandoned
- 2000-08-30 BR BR0014477-0A patent/BR0014477A/en not_active Application Discontinuation
- 2000-08-30 EP EP00955980A patent/EP1212469A1/en not_active Withdrawn
- 2000-08-30 WO PCT/BE2000/000098 patent/WO2001021841A1/en not_active Application Discontinuation
Also Published As
| Publication number | Publication date |
|---|---|
| BR0014477A (en) | 2002-06-18 |
| WO2001021841A1 (en) | 2001-03-29 |
| CN1375016A (en) | 2002-10-16 |
| BE1012905A3 (en) | 2001-05-08 |
| EP1212469A1 (en) | 2002-06-12 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Discontinued |