Method for estimating the strength of compacted body, method for manufacturing compacted body, apparatus for manufacturing compacted body, and coke oven

Abstract

To provide an estimation method for strength of a compacted molded body, to provide a production method for the compacted molded body using the estimation method for the strength of the compacted molded body, to provide a production device for the compacted molded body, and to provide a coke oven, wherein the estimation method for the strength of the compacted molded body enables the strength of compacted molded body produced by compacting powder and granular material with a drop hammer to be estimated with high accuracy, without being affected by differences in the size of the compacting test apparatus or the volume of the compacted molded body.SOLUTION: An estimation method for the strength of a compacted molded body, produced by compacting a powdery granular material using a drop hammer, comprises: obtaining a relationship between the value obtained by dividing the total absolute momentum of the drop hammer used for compacting the compacted molded body by the volume of the compacted molded body, and a measured strength value for the compacted molded body; and estimating the strength of another compacted molded body using the relationship and the value obtained by dividing the total absolute momentum of the drop hammer by the volume of the compacted molded body.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present invention relates to a method for estimating the strength of a compact produced by compacting powder particles with a drop hammer, a method for producing a compact, an apparatus for producing a compact, and a coke oven. [Background technology]

[0002] Coke ovens are classified into two types: top-charge type, in which coal is charged into the coke chamber from above the oven, and stamp-charge type, in which the coal is first compacted using a stamping device and then charged into the coke chamber from the side of the oven. The coal charged into a stamp-charge type coke oven is loaded into a stamping device and compacted with a drop hammer to compact it into a flat coal cake that matches the shape of the coke oven's coke chamber. In this way, stamp-charge type coke ovens compact the coal before charging it into the coke chamber, so even if so-called low-grade coal with low caking properties is used, it is possible to produce coke with the hardness required for blast furnace feedstock, which has the advantage of reducing raw material costs.

[0003] When the coal cake compacted into a flat plate by the stamping device is loaded into the carbonization chamber, the coal cake is pushed into the carbonization chamber from the side in a self-standing state without being supported in the thickness direction. If the compacted coal cake does not have enough strength at this time, the coal cake may collapse due to the external force and vibration applied to it when it is loaded into the carbonization chamber.

[0004] Therefore, in order to load the compacted coal cake into the carbonization chamber without it collapsing, it is necessary to appropriately set the coal compaction conditions in the stamping device so that the compacted coal cake has the necessary strength.

[0005] Non-Patent Documents 1 and 2 describe that the main factors that govern the uniaxial compressive strength of coal cake produced by tamping coal with a drop hammer are the moisture content and particle size of the coal, and the kinetic energy input from the drop hammer to a unit volume of coal cake. In other words, they describe that the strength required for the compacted coal cake can be ensured by setting the tamping conditions so that the kinetic energy input from the drop hammer to the coal cake is an appropriate amount.

[0006] Therefore, it is conceivable to measure the strength of coal cakes produced by compacting coal under various compaction conditions using a stamping device, and identify the compaction conditions that will give the coal cake the necessary strength based on the relationship between the measured strength of the coal cake and the compaction conditions. [Prior art documents] [Non-patent literature]

[0007] [Non-Patent Document 1] PS Dash et al., “Laboratory Scale Investigation to Improve the Productivity of Stamp Charge Coke Oven through Optimization of Bulk Density of Coal Cake”, ISIJ International, Vol.45 (2005), No.11, pp. 1577-1586 [Non-patent document 2] Jorge Madias et al., “A Review on Stamped Charging of Coals”, 43rd Ironmaking and Raw Materials Seminar, 12th Brazilian Symposium on Iron Ore and 1st Brazilian Symposium on Agglomeration of Iron Ore, September 1st to 4th, 2013, pp. 29-43 Summary of the Invention [Problem to be solved by the invention]

[0008] However, producing coal cakes under various tamping conditions using a full-scale stamping device and measuring their strength requires a great deal of effort and expense, making it unrealistic. Therefore, the inventors conducted extensive research into whether it would be possible to use a full-scale stamping device and a small-scale tamping test device to compact coal under various tamping conditions to produce coal cakes, obtain the relationship between the measured strength values ​​and the tamping conditions, and use this relationship to set the tamping conditions for the full-scale stamping device.

[0009] According to the inventors' investigations, even if the compaction conditions are set so that the kinetic energy input to a unit volume of coal cake is the same, the measured strength of the coal cake may vary significantly if the size of the compaction test equipment, the volume of the compacted body, etc. are different. In other words, the uniaxial compressive strength of coal cake produced by compacting coal with a drop hammer can vary due to the influences of the size of the compaction test equipment, the volume of the compacted body, etc., in addition to the factors described in Non-Patent Documents 1 and 2.

[0010] Therefore, even if the compaction conditions in a full-scale stamping device are set to be equivalent to the kinetic energy input to a unit volume of coal cake in a small-scale compaction molding device, the coal cake produced by the full-scale stamping device does not necessarily have the same strength as the coal cake produced by a small-scale compaction molding device.

[0011] The present invention has been made in consideration of the above-mentioned problems, and aims to provide a method for estimating the strength of a compact produced by compacting powder or granular material with a drop hammer, which can estimate the strength of the compact with high accuracy without being affected by differences in the size of the compaction test device, the volume of the compact, etc. It also aims to provide a method for manufacturing a compact, an apparatus for manufacturing a compact, and a coke oven using this method for estimating the strength of the compact. [Means for solving the problem]

[0012] In order to solve the above problems, the present invention has the following features.

[0013] [1] A method for estimating the strength of a compacted body produced by compacting powder or granular material with a drop hammer, which comprises obtaining a relationship between the total absolute value of the momentum of the drop hammer used to compact the compacted body divided by the volume of the compacted body and the measured strength for the compacted body, and estimating the strength of other compacted bodies using the relationship between the total absolute value of the momentum of the drop hammer used to compact the compacted body divided by the volume of the compacted body.

[0014] Here, the strength of the compact refers to, for example, uniaxial compressive strength, but is not limited to this and may also be shear strength measured by a direct shear test or a simple shear test.

[0015] The momentum of the drop hammer that compacts the compacted body refers to the momentum of the drop hammer when it collides with the compacted body.

[0016] [2] A method for estimating the strength of a compacted body described in [1], wherein the compaction conditions for the compacted body for which the measurement value is obtained are different from the compaction conditions for the other compacted bodies.

[0017] Here, the compaction conditions refer to, for example, the volume of the compacted body, the shape of the compacted body, the number of compacted layers, the number of compactions per compacted layer, the drop height of the drop hammer, the mass of the drop hammer, the shape of the drop hammer, or a combination of these.

[0018] [3] A method for estimating the strength of a compacted body produced by compacting powder or granular material with a drop hammer, comprising: obtaining a relationship between the measured values ​​and the total absolute value of the momentum and the total kinetic energy of the drop hammer that compacts the compacted body, respectively, divided by the volume of the compacted body, for the compacted body for which the measured strength values ​​have been obtained; and estimating the strength of other compacted bodies using the relationship and the values ​​obtained by dividing the total absolute value of the momentum and the total kinetic energy of the drop hammer, respectively, divided by the volume of the compacted body.

[0019] Here, the strength of the compact refers to, for example, uniaxial compressive strength, but is not limited to this and may also be shear strength measured by a direct shear test or a simple shear test.

[0020] The momentum and kinetic energy of the drop hammer that compacts the compacted body refer to the momentum and kinetic energy of the drop hammer when it collides with the compacted body.

[0021] [4] A method for estimating the strength of a compacted body described in [3], wherein the compaction conditions for the compacted body for which the measurement value is obtained are different from the compaction conditions for the other compacted bodies.

[0022] [5] A method for producing a compacted body by compacting powder or granular material with a drop hammer, in which the momentum of the drop hammer used to compact the other compacted body is controlled so that the strength of the other compacted body estimated by the method for estimating the strength of a compacted body described in [1] or [2] is equal to or greater than a desired value.

[0023] [6] A method for producing a compacted body by compacting powder or granular material with a drop hammer, in which the momentum and kinetic energy of the drop hammer that compacts the other compacted body are controlled so that the strength of the other compacted body estimated by the method for estimating the strength of a compacted body described in [3] or [4] is equal to or greater than a desired value.

[0024] [7] A compacted body manufacturing device that produces compacted bodies by compacting powder and granular material with a drop hammer, wherein the device estimates the strength of other compacted bodies to be manufactured using a previously obtained relationship between the value obtained by dividing the total absolute value of the momentum of the drop hammer that compacts the compacted bodies that have already been manufactured by the volume of the compacted bodies and the measured value of the strength of the compacted bodies, and the value obtained by dividing the total absolute value of the momentum of the drop hammer that compacts the compacted bodies that will be manufactured in the future by the volume of the compacted bodies, and is configured to be able to control the momentum of the drop hammer that compacts the other compacted bodies so that the estimated strength of the other compacted bodies is equal to or greater than a desired value.

[0025] [8] A compacted body manufacturing device that produces compacted bodies by compacting powder and granular material with a drop hammer, wherein the device is configured to estimate the strength of other compacted bodies to be produced using a previously obtained relationship between the measured values ​​and the total absolute value of the momentum and the total amount of kinetic energy of the drop hammer that compacts the compacted bodies that have already been produced, respectively, divided by the volume of the compacted bodies, and the total absolute value of the momentum and the total amount of kinetic energy of the drop hammer that compacts the compacted bodies that have already been produced, respectively, divided by the volume of the compacted bodies, and the relationship, and to control the momentum and kinetic energy of the drop hammer that compacts the other compacted bodies so that the estimated strength of the other compacted bodies is equal to or greater than a desired value.

[0026] [9] An apparatus for manufacturing a compacted body as described in claim 7 or 8, wherein the powdered material is coal and the compacted body is a coal cake.

[0027]

[10] The apparatus for manufacturing a compacted body according to [9], wherein the coal cake has a flat plate shape with an aspect ratio between its long side and its short side of 2.0 to 3.0.

[0028]

[11] A coke oven equipped with a stamping device consisting of the compact manufacturing device described in [9], and configured so that the coal cake manufactured by the stamping device can be charged into a carbonization chamber. [Effects of the Invention]

[0029] The method for estimating the strength of compacts, the method for manufacturing compacts, the apparatus for manufacturing compacts, and the coke oven according to the present invention make it possible to estimate with high accuracy the strength of compacts manufactured by compacting powder and granular materials with a drop hammer, without being affected by differences in the size of the compaction test apparatus, the volume of the compacts, etc. This makes it possible to prevent the collapse of compacts and disruption to operations that use compacts. [Brief explanation of the drawings]

[0030] [Figure 1] FIG. 1 is a schematic diagram showing the structure of a stamp charge type coke oven. [Figure 2] FIG. 2 is a schematic diagram showing the configuration of a compaction test device. [Figure 3] FIG. 3 is a graph showing the change in strength of a coal cake produced by compacting coal with a drop hammer, when the number of tamping operations is changed without changing the absolute value of the momentum and kinetic energy of the drop hammer used to compact the coal cake. [Figure 4] FIG. 4 is a graph showing the relationship between the absolute value of momentum and the strength of the coal cake when the tamping conditions are varied when tamping coal with a drop hammer to produce a coal cake. [Figure 5]FIG. 5 is a graph showing the change in strength of a coal cake when the kinetic energy of the drop hammer used to tamp the coal cake is kept constant while the absolute value of the momentum is changed when the coal is tamped with the drop hammer to produce a coal cake. DETAILED DESCRIPTION OF THE INVENTION

[0031] Hereinafter, with reference to the drawings, embodiments of the method for estimating the strength of a compact, the method for manufacturing a compact, the apparatus for manufacturing a compact, and the coke oven of the present invention will be described in detail.

[0032] In this embodiment, the powdered material is coal P, the compact is coal cake C, and the coal cake C is charged into the carbonization chamber of a stamp charge type coke oven 1 for use.

[0033] FIG. 1 schematically shows the overall configuration of a coke oven 1 of this embodiment. The coke oven 1 is equipped with a stamping device 10 that produces a coal cake C by tamping coal P with a drop hammer 11, and is configured so that the coal cake C produced by the stamping device 10 can be charged into the coke chamber 1A. The coal P is transported from the outside by a conveyor 21 and loaded into the compaction space of the stamping device 10 via a charging chute 22. The charged coal P is tamped by the drop hammer 11 of the stamping device 10 and formed into a flat coal cake C with a thickness that allows a gap of, for example, 10 to 20 mm between the coal cake C and the inner wall (not shown) of the coke oven 1. Specifically, the dimensions of the coal cake C charged into the carbonization chamber 1A of the coke oven 1 are, for example, a thickness of 340 to 520 mm, a height of 4800 to 7200 mm, and a width of 11500 to 17200 mm, and the mass of the coal cake C is, for example, 20.8 to 70.1 tons. The aspect ratio of the height to the thickness of the coal cake C is, for example, 13 to 14 so that the coal cake C can stand on its own without being supported in the thickness direction. In addition, the aspect ratio of the long side to the short side of the flat coal cake C, i.e., the width to the height, is, for example, 2.0 to 3.0 so that the coal cake C will not collapse when it is pushed into the carbonization chamber 1A from the side.

[0034] As shown in FIG. 1 , the coal cake C produced by the stamping device 10 is pushed from the side by the coal cake charging device 23 and charged into the coke chamber 1A of the coke oven 1. At this time, as described above, the coal cake C is pushed into the coke chamber 1A from the side in a self-standing state without being supported in the thickness direction. Therefore, it is necessary to ensure the strength of the coal cake C produced by the stamping device 10 so that the coal cake C does not collapse due to external forces and vibrations applied to the coal cake C when it is charged into the coke chamber 1A.

[0035] Therefore, in the method for estimating the strength of a compacted body of this embodiment, the uniaxial compressive strength qu (kN / m 2) is estimated as described below. The unconfined compressive strength qu (kN / m 2 ) refers to a value measured by the method specified in Japanese Industrial Standard JIS A1216 (Uniaxial Compression Test Method for Soil). In the method and apparatus for manufacturing a compacted body according to the present embodiment, i.e., the stamping apparatus 10, the estimated uniaxial compressive strength qu (kN / m 2 The operation of the drop hammer 11 is controlled so that the force of the drop hammer 11 is equal to or greater than a desired value. Here, the "desired value" is the strength required to charge the coal cake C into the carbonization chamber 1A without causing it to collapse.

[0036] Here, the strength required to charge the coal cake C into the carbonization chamber 1A without collapsing it is set according to the shape, dimensions, and mass of the coal cake C, the operating conditions of the coal cake charging device 23, the type and particle size of the coal P used, etc. Specifically, as the strength required to charge the coal cake C into the carbonization chamber 1A without collapsing it, the uniaxial compressive strength qu of the coal cake C in the consolidation direction is set to, for example, 80 kN / m 2 It is preferable to secure at least the uniaxial compressive strength qu (kN / m 2 The momentum, or momentum and kinetic energy, of the drop hammer 11 that tamps the coal cake C is controlled so that the above-mentioned desired value or more is reached.

[0037] The coal cake C charged into the carbonization chamber 1A of the coke oven 1 is heated and carbonized by heat transfer from combustion chambers (not shown) on both sides of the carbonization chamber 1A, and becomes coke. The produced coke is loaded onto a fire truck 25 via a coke guide vehicle 24 by an extrusion device (not shown) and carried out.

[0038] In the method for estimating the strength of a compacted body according to this embodiment, a compaction test device 30, which is smaller than the full-scale stamping device 10 as shown in FIG. 2, is used to compact coal P with a drop weight 31 to produce a coal cake C0. The uniaxial compressive strength qu0 (kN / m 2) is measured by the method specified in the Japanese Industrial Standard JIS A1216 (Unconfined Compression Test Method for Soil). Furthermore, the unconfined compressive strength qu0 (kN / m 2 ) and the absolute value of the momentum of the falling weight 31 compacting the coal cake C0, ΣK0 (kN s), are calculated as the volume V0 (m 3 ) divided by ΣK0 / V0(kN·s / m 3 ) to obtain the relationship between the momentum of the falling weight 31 that compacts the coal cake C0 and the momentum of the falling weight 31 when the falling weight 31 collides with the coal cake C0.

[0039] Then, the above relationship obtained using the compaction test device 30 and the total absolute value of the momentum of the drop hammer 11 that compacts the coal cake C in the full-scale stamping device 10, ΣK (kN·s), are calculated based on the volume V (m 3 ) divided by ΣK / V(kN s / m 3 ) and the uniaxial compressive strength qu (kN / m 2 ) is estimated as described below. "The momentum of the drop hammer 11 tamping the coal cake C" refers to the momentum of the drop hammer 11 when the drop hammer 11 collides with the coal cake C0.

[0040] The absolute value K (kN·s) of the momentum when the drop hammer 11 falls freely and collides with the coal P, and the absolute value K0 (kN·s) of the momentum when the drop weight 31 falls freely and collides with the coal P are expressed by the following equations (1) and (2), respectively.

[0041] K=m√(2gh) …… (1) K0=m0√(2gh0) …… (2) Here, m is the mass (kg) of the drop hammer 11, m0 is the mass (kg) of the drop weight 31, h is the drop height (m) of the drop hammer 11, h0 is the drop height (m) of the drop weight 31, and g is the gravitational acceleration (m / s 2 )

[0042] In addition to the above, the tamping test device 30 was used to measure the uniaxial compressive strength qu0 (kN / m 2 ) and the total amount of kinetic energy ΣE0 (kJ) of the falling weight 31 compacting the coal cake C0, and the volume V0 (m 3 ) divided by ΣE0 / V0(kJ / m 3 ) should be acquired.

[0043] The kinetic energy E (kJ / m) of the drop hammer 11 when it falls freely and hits the coal P. 3 ), and the kinetic energy E0 (kJ / m 3 ) are expressed as the following equations (3) and (4), respectively.

[0044] E=mgh …… (3) E0=m0gh0…… (4) Here, m is the mass (kg) of the drop hammer 11, m0 is the mass (kg) of the drop weight 31, h is the drop height (m) of the drop hammer 11, h0 is the drop height (m) of the drop weight 31, and g is the gravitational acceleration (m / s 2 )

[0045] The uniaxial compressive strength qu (kN / m) in the compaction direction of the coal cake C produced by the above-mentioned method, in which the coal P is dropped in the stamping device 10 and compacted by the hammer 11, is 2 ) can be estimated with high accuracy without being affected by the difference in size between the stamping device 10 and the compaction test device 30. This will be described below.

[0046] In Fig. 3, when coal P is compacted by a drop weight 31 in a compaction test device 30 to produce a coal cake C0, the total absolute value of the momentum ΣK0 (kN s) and the total amount of kinetic energy ΣE0 (kJ) of the drop weight 31 compacting the coal cake C0 are plotted against the volume V0 (m 3 ) divided by ΣK0 / V0(kN·s / m 3For Test Example 1 and Test Example 2, in which the number of tamping times was changed without changing the uniaxial compressive strength qu0 (kN / m 2 ) are shown as measured values.

[0047] In addition, Fig. 4 shows the relationship between the total absolute value of the momentum of the drop weight 31 tamping the coal cake C0, ΣK0 (kN·s), and the uniaxial compressive strength qu0 (kN / m 2 ) shows the relationship with the measured value.

[0048] Furthermore, in the tamping test device 30, when the coal P is tamped by the drop weight 31 to produce the coal cake C0, the total amount of kinetic energy ΣE0 (kJ) of the drop weight 31 tamping the coal cake C0 is calculated as the volume V0 (m 3 ) divided by E0 / V0(kN·s / m 3 ) is kept equal, the total absolute value of momentum ΣK0 (kN s) is calculated by dividing the volume of coal cake C0 by the volume V0 (m 3 ) divided by K0 / V0(kN·s / m 3 For Test Examples 3 and 4, where the uniaxial compressive strength qu0 (kN / m 2 ) are shown as measured values.

[0049] In Test Examples 1 and 2 shown in Figure 3, the moisture content of coal P was 12%, the proportion of coal sized 3 mm or less was 75%, and the Hardgrove Grindability Index (HGI) defined in the international standard ISO 5074 (Determination of the Hardgrove Grindability Index) was 50. A drop weight 31 with a mass m0 of 9.0 kg and a base diameter of 50 mm was used, and the drop height h0 of the drop weight 31 was set to 300 mm to produce a cylindrical coal cake C0 with a diameter of 100 mm and a height of 200 mm. In Test Example 1, five tamped layers were formed, and each tamped layer was tamped 20 times. In Test Example 2, ten tamped layers were formed, and each tamped layer was tamped 10 times.

[0050] In each test example shown in FIG. 4, four types of coal P were prepared: coal samples A to C and coal blend D. For coal sample A, the moisture content was 11%, the proportion of coal sized 3 mm or less was 70%, and the HGI was 50. For coal sample B, the moisture content was 12%, the proportion of coal sized 3 mm or less was 80%, and the HGI was 50. For coal sample C, the moisture content was 12%, the proportion of coal sized 3 mm or less was 90%, and the HGI was 70. For coal blend D, the moisture content was 11%, the proportion of coal sized 3 mm or less was 90%, and the average HGI was 64. A cylindrical coal cake C0 with a diameter of 100 mm and a height of 200 mm was prepared using a drop weight 31 with a mass m0 of 9.0 kg and a base diameter of 50 mm, and a drop height h0 of 300 mm. For coal sample A and coal sample B, the number of tamped layers was set to four types: 3, 5, 7, and 10 layers, and the number of tamping times per tamping layer was set to three types: 10, 20, and 30. Coal cakes C0 were produced under twelve different tamping conditions. For coal sample C and coal blend D, coal cakes C0 were produced under three different tamping conditions: 5 tamped layers with each tamping layer being tamped 10 times, 10 tamped layers with each tamping layer being tamped 10 times, and 7 tamped layers with each tamping layer being tamped 20 times.

[0051] In Test Examples 3 and 4 shown in Figure 5, the moisture content of coal P was 12%, the proportion of coal sized 3 mm or less was 75%, and the HGI was 50. For Test Example 3, a drop weight 31 with a mass m0 of 100.0 kg and a base diameter of 190 mm was used, and 20 tamping layers were created. Tamping was performed once for each tamping layer with a drop height h0 of 480 mm to produce a cylindrical coal cake C0 with a diameter of 200 mm and a height of 400 mm. For Test Example 4, a drop weight 31 with a mass m0 of 132.3 kg and a base diameter of 180 mm was used, and 30 tamping layers were created. Tamping was performed once for each tamping layer with a drop height h0 of 240 mm to produce a cylindrical coal cake C0 with a diameter of 200 mm and a height of 400 mm.

[0052] Then, the uniaxial compressive strength qu0 (kN / m) in the consolidation direction of the coal cake C0 of each test example was measured using the method specified in the Japanese Industrial Standard JIS A1216 (uniaxial compression test method for soil). 2 ) were measured respectively.

[0053] As can be seen from Test Example 1 and Test Example 2 shown in Figure 3, even if the tamping conditions of the coal cake C0 are different, the total absolute value of the momentum of the falling weight 31, ΣK0 (kN s), can be calculated by multiplying the volume V0 (m 3 ) divided by ΣK0 / V0(kN·s / m 3 ) is the same, the uniaxial compressive strength qu0 (kN / m 2 ) measurements are almost unchanged.

[0054] In contrast, as can be seen from Test Examples 3 and 4 shown in Fig. 5, the total amount of kinetic energy ΣE0 (kJ) of the falling weight 31 is calculated based on the volume V0 (m 3 ) divided by ΣE0 / V0(kN s / m 3 ) is the same, the total absolute value of the momentum of the falling weight 31, ΣK0 (kN s), is calculated by dividing the volume of the coal cake C0 by the volume V0 (m 3 ) divided by ΣK0 / V0(kN·s / m 3 ) is significantly different, the uniaxial compressive strength qu0 (kN / m 2 ) also vary greatly.

[0055] Furthermore, as can be seen from the test examples shown in Figure 4, the total absolute value of the momentum of the falling weight 31 that compacts the coal cake C0, ΣK0 (kN s), is calculated by dividing the volume V0 (m 3 ) divided by ΣK0 / V0(kN·s / m 3 ) and the uniaxial compressive strength qu0 (kN / m 2 ) there is a clear correlation between

[0056] FIG. 4 shows the uniaxial compressive strength qu0 (kN / m 2) and the total absolute value of the momentum of the falling weight 31, ΣK0 (kN s), is calculated by dividing the volume of the coal cake C0 by the volume V0 (m 3 ) divided by ΣK0 / V0(kN·s / m 3 ) is shown together with a straight line and approximate equation that approximates the relationship between the unconfined compressive strength qu0 (kN / m 2 ) measured values ​​deviate very little from the approximation formula.

[0057] Therefore, using the compaction test device 30, the uniaxial compressive strength qu0 (kN / m 2 ) and the absolute value of the momentum of the falling weight 31 compacting the coal cake C0, ΣK0 (kN s), are calculated as the volume V0 (m 3 ) divided by ΣK0 / V0(kN·s / m 3 ) is obtained as the relationship between the uniaxial compressive strength qu (kN / m 2 ) is calculated by the above approximation formula, and the total absolute value of the momentum of the drop hammer 11 that compacts the coal P in the full-scale stamping device 10, ΣK (kN s), is calculated by the volume V (m 3 ) divided by ΣK / V(kN s / m 3 ) and is estimated using

[0058] It can also be seen that the slope of the approximation line shown in FIG. 4 varies depending on the HGI values ​​of coal samples A to C and coal blend D. Specifically, the larger the HGI value, the larger the slope of the approximation line. Therefore, the uniaxial compressive strength qu (kN / m 2 ) is estimated by preparing a coal cake C0 in a compaction test device 30 using coal of the same type or a coal with a similar HGI value as that used to prepare the coal cake C, and measuring the uniaxial compressive strength qu0 (kN / m 2It is preferable to obtain and use the above-mentioned approximate formula (relationship) based on the measured values ​​of HGI of coal P. Alternatively, it is preferable to further include the HGI value of coal P in the above-mentioned approximate formula so that the value derived from this approximate formula reflects the influence of differences in HGI values.

[0059] In this way, the total absolute value of the momentum of the falling weight 31, ΣK0 (kN s), is calculated by dividing the volume of the coal cake C0 by the volume V0 (m 3 ) divided by ΣK0 / V0(kN·s / m 3 ) is kept the same, the uniaxial compressive strength qu0 (kN / m 2 ) are found to be of similar magnitude.

[0060] Therefore, the above-mentioned approximate formula obtained using the compaction test device 30 and the total absolute value of the momentum of the drop hammer 11 that compacts the coal cake C in the full-scale stamping device 10, ΣK (kN s), are calculated by dividing the volume V (m 3 ) divided by ΣK / V(kN s / m 3 ) and the uniaxial compressive strength qu (kN / m 2 ) can be estimated with high accuracy without being affected by the difference in size between the stamping device 10 and the compaction test device 30.

[0061] Also, K0 / V0(kN·s / m 3 ) and qu0(kN / m 2 ), the total amount of kinetic energy ΣE0 (kJ) of the falling weight 31 compacting the coal cake C0 is related to the volume V0 (m 3 ) divided by ΣE0 / V0(kJ / m 3 ) and the uniaxial compressive strength qu0 (kN / m 2 ) also exists. In addition to the above, the total absolute value of the momentum of the falling weight 31 that compacts the coal cake C0 using the compaction test device 30, ΣE0 (kJ), is calculated by multiplying the volume V0 (m 3 ) divided by ΣE0 / V0(kJ / m 3), if the relationship between K0 / V0(kN·s / m 3 ) and qu0(kN / m 2 ), in addition to the relationship between ΣE0 / V0(kJ / m 3 ) and qu0(kN / m 2 ), the total absolute value K (kN s) of the momentum of the drop hammer 11 that compacts the coal cake C in the full-scale stamping device 10 and the total amount of kinetic energy ΣE (kJ) are calculated based on the volume V (m 3 ) divided by K / V (kN s / m 3 ) and E / V (kJ / m 3 ) to obtain the uniaxial compressive strength qu (kN / m 2 ) can be estimated with even greater accuracy.

[0062] The compact manufacturing apparatus of this embodiment, i.e., the stamping apparatus 10, is configured to be able to control the momentum or momentum and kinetic energy of the drop hammer 11 that compacts the coal cake C so that the strength of the coal cake C estimated by the above-mentioned method for estimating the strength of a compacted body is equal to or greater than the desired value.

[0063] In the above embodiment, the powder P is coal and the compact C is a coal cake. However, the method for estimating the strength of a compact, the method for manufacturing a compact, and the device for manufacturing a compact are also applicable to cases where a compact is manufactured by compacting various powders other than coal with a drop hammer.

[0064] In the above embodiment, the case where the uniaxial compressive strength is estimated as the strength of the compact C has been described. However, the method for estimating the strength of a compact, the method for manufacturing a compact, and the device for manufacturing a compact of the present invention can also be applied to cases where a compact is manufactured by compacting various powdered or granular materials other than coal with a drop hammer. [Explanation of symbols]

[0065] 1. Coke oven 1A carbonization chamber 10 Stamping equipment (compact molding manufacturing equipment) 11 Drop Hammer 21 Conveyor 22 Charging chute 23 Coal cake charging device 24 Cork Guide Car 25 Fire truck 30. Compaction testing equipment (compacted compact manufacturing equipment) 31 Drop hammer P Coal (powder) C0 coal cake (compacted body) C. Coal cake (other compacted bodies)

Claims

1. A method for estimating the strength of a compact produced by compacting powder and granular material with a drop hammer, For the compacted body for which the strength measurement value has been obtained, the relationship between the total absolute value of the momentum of the drop hammer that compacts the compacted body divided by the volume of the compacted body and the measurement value is obtained, A method for estimating the strength of a compact, which estimates the strength of another compact using the value obtained by dividing the total absolute value of the momentum of the drop hammer by the volume of the compact and the relationship.

2. A method for estimating the strength of a compacted body as described in claim 1, wherein the compaction conditions of the compacted body for which the measurement values ​​are obtained are different from the compaction conditions of the other compacted bodies.

3. A method for producing a compacted body by dropping powder and granular material and tamping it with a hammer, A method for manufacturing a compacted body, which controls the momentum of the drop hammer that compacts the other compacted body so that the strength of the other compacted body estimated by the method for estimating the strength of a compacted body described in claim 1 or 2 is equal to or greater than a desired value.

4. A compaction molding manufacturing apparatus for manufacturing a compaction molding by dropping powder and granular material and compacting it with a hammer, A compacted body manufacturing device that estimates the strength of other compacted bodies to be manufactured using a previously obtained relationship between the value obtained by dividing the total absolute value of the momentum of the drop hammer that compacts the compacted bodies that have already been manufactured by the volume of the compacted bodies and the measured value of the strength of the compacted bodies, and the value obtained by dividing the total absolute value of the momentum of the drop hammer that compacts the compacted bodies that will be manufactured in the future by the volume of the compacted bodies, and is configured to be able to control the momentum of the drop hammer that compacts the other compacted bodies so that the estimated strength of the other compacted bodies is equal to or greater than a desired value.

5. 5. The apparatus for manufacturing a compacted body according to claim 4, wherein the powdered material is coal, and the compacted body is a coal cake.

6. The apparatus for manufacturing a compact according to claim 5, wherein the coal cake has a flat plate shape with an aspect ratio of a long side to a short side of 2.0 to 3.

0.

7. A coke oven comprising a stamping device comprising the apparatus for manufacturing a compacted body according to claim 5, wherein the coal cake manufactured by the stamping device can be charged into a carbonization chamber.

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