SU1039965A1 - Device for controlling distribution of charge materials in the charging equipment of blast furnace - Google Patents

Abstract

1. DEVICE FOR MONITORING THE DISTRIBUTION OF SECURITY MATERIALS IN THE EQUIPMENT OF A DIPLOMATOUS TREATMENT EQUIPMENT, containing a probe with an inductive coil wound on a skeleton made of ferromagnetic material, forming an open magnetic circuit on the center of the probe stem and containing a protective protector of the ferromagnetic material that forms an open magnetic circuit on the center of the probe stem and has a protective protector. with the probe coil, which is characterized by the fact that, in order to increase the reliability of control of the fractions of bulk materials with different magnetic permeabilities, the Donda head is equipped with an additional coil connected to the main coil parallel to the S S, while the magnetic circuits of the coils are made with a discontinuity and removed when (L help sleeves to the outer surface of the probe head. 2. The device according to claim 1, about 1 The sleeves are made of corrugated. CA CP CO a ate

Description

The invention relates to ferrous metallurgy, in particular, to the study of the operation of a blast furnace in the distribution of charge materials, for example, in the equipment of a charging device. It is known to define the distribution of materials in the cone space, including the sampling of feed materials from a small cone in various places around the circumference of a large cone. In this case, the device contains a support ring placed on the rod of a large cone, and samplers installed on it in the form of frames with bags. In order to achieve a reliable determination, it is necessary that the width of the cut flow is not less than a certain size and that the entire material to be cut is shown in the corresponding bags. In order to avoid bag overflow with sample materials, they are manufactured of a deliberately larger volume. When bags are overflowed, the reliability of the samples taken is drastically reduced. 3. The disadvantages are the greater laboriousness of installing frames with bags in the space between the cages and removing the samples taken. Another disadvantage is that this method can be used only for blowing-in of newly built furnaces, since the ingress of carbon monoxide into the conic space is unacceptable. A device is known for controlling the distribution of materials in the funnel of a small cone of the domain1 cm furnace, which contains a support ring and samplers attached to it, made in the form of tanks equipped with lids installed in the container with the possibility of rotation inside the vessel. The determination of the distribution of materials by this device is made by sampling with different depths of mass, formed materials and in various sectors around the circumference of the small cone. For sampling in the places to be filled with materials, pre-samplers are placed. Selected samples are classified by fraction to determine their particle size distribution f 2. The disadvantages of this device are the need to take a significant number of samples and their subsequent 9652 particle size analysis to obtain complete information on the distribution of materials. The need to manually classify the samples taken on site or to transport them to a specially equipped place for particle size analysis makes it even more difficult to determine the distribution of materials by this device. It is known that determining the position of layers of charge materials at the top of a blast furnace, including fixing the interfaces of various materials by changing the inductance at the interface Z. The disadvantage of this known solution is that it does not provide the ability to determine the location of the sectors with increased and decreased gas permeability. materials. Also known are devices for controlling the behavior of the charge in a blast furnace, which contain lower Y below the furnace (fill pipes with magnetic sensors installed in them and devices for processing information from them. A disadvantage of these devices is the effect on the sensor reading of a large number of different distorting factors, for example, the degree of mixing and loosening of the lowering charge, the interaction of the gas flow and the charge, the effect of temperature on the sensor and on the properties of the charge. This is a device for controlling the distribution of charge materials in the blast furnace charging device, containing a probe immersed in materials with an inductive coil wound on a skeleton of ferromagnetic material forming an open magnetic circuit and placed on the central rod of the probe head, equipped with a protective cone, and A measurement system with a secondary device connected to the coil of a CSJ probe. The residuals of this device are insufficient sensitivity and selectivity. fractional composition of the bulk mass of bulk materials having magnetic properties, respectively, the impossibility of its use for determining raspredeeni materials. 3 103 The purpose of the device is to increase the reliability of monitoring fractions of bulk materials with different magnetic permeabilities. The goal is achieved by the fact that in the device controlling the distribution of charge materials in the equipment of the blast furnace of the blast furnace; furnace containing a probe with an inductive coil wound on a frame of a ferromagnetic material forming an open magnetic circuit on the central rod of the probe head having a protective cone, as well as a measurement system with a secondary device connected to the probe coil, the probe head is equipped with an additional, coil connected to the main coil in parallel, with the magnetic circuits of the coils made with a gap and pulled out with the help of bushings to the outer surface of the probe head. The outer surfaces of the sleeves are corrugated. In FIG. 1 shows a device for controlling the distribution of charge materials / materials in the equipment of the blast furnace charging apparatus, general view; in fig. 2 shows section A-A in FIG. one; in fig. 3 is a plot of the conductivity of the alternating current of the coil of the probe (with one coil without corrugation of the outer surface of the magnetic circuit) introduced into the layer of agglomerate; in fig. k is a graph of the bulk density and porosity of the agglomerate on the size of its fractions. Studies have shown that the properties of the bulk mass of the agglomerate largely depend on its fractional composition. The resistance to alternating current of the probe coil introduced into the layer of agglomerate increases continuously as the size of the fractions of the agglomerate decreases (Fig. 1). The equivalent and inductance (1.) kАТ I of the carcass of the probe is changed in the same way. This is explained by an increase in the packing density in a unit volume of the agglomerate fractions as their sizes decrease. The bulk density of the agglomerate as its fractions decrease continuously increases (Fig. 4). Porosity and gas permeability of the bulk mass of the alomerate have a similar dependence on the fractional composition. Porosity and gas permeability of large agglomerate is much greater than that of small. The process of segregation of the agglomerate fractions when it is poured from the skip into the small cone funnel is such that the bulk of the fine fractions of the agglomerate are located close to the emptying skip, the larger fractions are farther from it, and the largest pieces of the agglomerate are located on the opposite side of the funnel. This pattern of distribution, where there is no mixing of large fractions with small ones and where fractions of similar size are located in each sector, and changing the size of fractions during the transition from one sector to another is smooth, creates very favorable conditions for determining the distribution using an inductive coil probe. Of the characteristics of a coil, its resistance to alternating current is the most sensitive and simple parameter suitable for determining the distribution of materials. The inductance (equivalent) of the coil, as a parameter, is not suitable for this purpose, since it requires complicated balancing of the measuring instrument bridge to measure it. A standard universal bridge with a built-in alternator can be used to measure the resistance of the probe coil to the alternating current. It is also possible to use a simple bridge containing a microammeter, included in its diagonal ,, and an alternator. In this case, the coil of the probe is included in one of the shoulders of the bridge, and the change in its resistance is estimated indirectly by the indication of the microammeter. The determination of the distribution of the charge materials, for example, in the funnel of the small cone of the blast furnace is carried out as follows. Before loading the investigated agglomerate, for example, the rotary spreader distributor is disconnected from the skip to the funnel. After the skip sinter 13 is poured into the small cone funnel, the loading system is disconnected with disassembly of the supply voltage supply circuit into the system. The probe is inserted vertically into the layer of the agpomerate in one of the investigated sectors and balances the universal measuring bridge connected to the coil of the probe to measure its resistance or, in the case of using another fiMM, immediately read the microammeter. For measurement at the following points, the probe is additionally immersed in the layer of agglomerate and the instrument readings are recorded accordingly. After completion of measurements in this sector, the probe is pulled out of the layer of agglomerate and transferred to the next sector. Measurements in other sectors are made similarly. The device for controlling the distribution of materials in the equipment of the blast furnace charging apparatus contains (FIG. 2) a probe with parallel-connected inductive coils 1 wound on a frame 2 of ferromagnetic material, forming open magnetic circuits placed on the central rod 3 of the probe head fitted with a protective cone k and measurement circuit connected to probe coils 1. Breaks 5 magnetic circuits of the coils 1 are made within 5-10 m and removed with the help of bushings 6 from steel with high magnetic permeability directly to the outer surface of the probe head. The outer surfaces of the sleeves 6 can be made corrugated (Fig. 3). The frames 2 of the coils 1, in addition to the sleeves 6, contain cylinders 7 of high magnetic permeability steel and ferrite rings 8. In the breaks of the magnetic circuits of the coils 1, protective sleeves 9 are installed of ebonite or other material that does not conduct electricity. Coils 1 are interconnected together, and the ends of the connections using wires 10 lead to the plug connector 11 mounted on the tail of the probe. The probe body 12 is made of steel pipe and has handles 13 for manually inserting the probe into the layer of the bulk material under investigation. The size of the gap at the break points of the 5 magnetic circuits of the coils 1 and the dimensions of the corrugations of the external elements (sleeves 6) of the magnetic circuit depend on the fractional composition of the sinter used for blast furnace smelting. If the content of small fractions (3 and 5 mm) is high in the applied sinter, then the gap in the areas of breaks 5 of the magnetic circuits of the coils 1 is chosen to be minimal and equal to 5 mm. 65 At the same time, the dimensions of the corrugations of the external elements of the magnetic circuits of the coils 1 are also chosen to be minimal and close to the sizes of the fine fractions of the agglomerate, so that the small pieces (3 and 5 mm) of the agglomerate can be freely positioned between the edges of the corrugation. In the case of blast furnace melting of fine fractions (5 mm) of the agglomerate, the size of the gap at the points of discontinuities of the 5 magnetic circuits of the coils 1 is chosen as maximum and equal to 10 mm. The dimensions of the corrugations of the external elements of the magnetic circuits of the coils 1 in this case are chosen as large as possible, so that pieces of agglomerate with dimensions less than 10 mm MOI- or freely fit between the edges of the corrugation. Coils 1 are wound with approximately the same number of turns so that they have the same resistance to alternating current. The device works as follows. When the probe is introduced into the layer of the agglomerate under study in the corresponding sectors of the equipment of the charging apparatus of the blast furnace, pieces of agglomerate, closure, the 5 breaks of the magnetic circuits of the coils 1 cause an increase in their resistance to alternating current. The change in the total resistance of the parallel-connected coils 1 of the probe to alternating current is determined by a universal bridge or by means of another measuring device connected to the coils 1 of the probe. The degree of closure of the discontinuities of the 5 magnetic circuits of the coils 1 of the probe with the agglomerate depends on its fractional composition. Fine agglomerate (3 and 5 mm), completely filling the space between the ribs of the corrugation and gaps 5 magnetic circuits of the coils 1, closes the magnetic circuits as much as possible and causes a maximum increase in the resistance of the coils 1 to alternating current. Large agglomerate due to the fact that its pieces cannot get into the space between the corrugation ribs and breaks 5 magnetic circuits of the coils 1, as well as due to the loose packing of their large pieces, very weakly closes the magnetic circuits and accordingly causes a minimal increase in the resistance of the coils 1 alternating current. According to measurements of probe resistance to alternating current, diagrams of agglomerate distribution are constructed, for example, in the volume of a small cone funnel, where areas with maximum resistance correspond to maximum concentration of small fractions of agglomerate, and areas with minimum resistance cooTBeTCTsyrot to the locations of the largest fractions of agglomerate . On the basis of these diagrams, for example, a work program for controlling the operation of a rotating charge distributor is developed. The advantages of control are good accuracy and simplicity in determining scientific research institutes. When determining the distributed materials in the small cone funnel by the proposed method, for example, there is no need for sampling and subsequent classification by fractions of 1 m. The advantage is also the high sensitivity and selectivity of the probe to the various fractions of the agglomerate. 5 High sensitivity of the device is achieved by parallel connection of the probe coils and placing gaps of their magnetic circuits on the outer surface of the probe head with the possibility of direct contact with the materials under study. The high selectivity of the device is ensured by corrugating the outer, in contact with the material under study, the surfaces of the magnetic circuits of the coils and selecting the size of the gap at the points of breaking of the magnetic circuits in accordance with the size of the fine fractions of the material. The invention, due to its good accuracy, provides more precise control of the program of operation of the rotating flow distributor around the circumference of the blast furnace. Accordingly, it provides an increase in the furnace productivity and a decrease in the specific coke consumption.

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Claims (2)

1. DEVICE FOR CONTROL OF DISTRIBUTION OF PRESSURE MATERIALS Of a blast furnace inlet furnace containing a probe with an inductive coil wound on a frame of ferromagnetic material forming an open magnetic circuit on the central rod of the probe head, having a protective cone and a measuring system with a secondary device, connected to the probe coil, characterized in that In order to increase the reliability of control of fractions of bulk materials with different magnetic permeabilities, the probe head is equipped with an additional coil connected in parallel with the main coil, while the magnet chains of the coils are made with a gap and withdrawn by means of bushings to the outer surface of the probe head. 2. The device according to p. ^ Characterized in that the outer surfaces of the bushings are made corrugated. eleven