JP5772277B2 - Coke hot reaction strength estimation method - Google Patents

Description

  The present invention relates to a method for estimating coke hot strength, which estimates the strength after coke hot reaction of blended coal.

  The coke used as the raw material for charging the blast furnace is required not only to have high coke strength after dry distillation but also to have high coke strength after reaction in the blast furnace. When pulverization increases after the reaction in the blast furnace, the air permeability of the reducing gas is hindered, and the operating conditions of the blast furnace are deteriorated.

  As an index for evaluating the coke strength after reaction in the blast furnace, the hot reaction strength of coke (hereinafter referred to as “CSR”) is used. The CSR measurement method is stipulated in ASTM-D5341, 200 g of coke adjusted to a size of 20 ± 1 mm, gas composition of carbon dioxide (100%), reaction temperature of 1100 ° C., reaction time of 2 hours. After the reaction, the mixture is defined as the percentage of mass on the 9.56 mm sieve with respect to the mass after reaction after 600 revolutions with a type I drum.

  When the coal composition at the time of coke production is changed, the CSR value of dry-distilled coke also changes. Therefore, it is important to predict the CSR in advance when changing the coal blending and to set the coal blending conditions so as to be as close as possible to the target CSR. Therefore, conventionally, various methods for estimating the coke hot reaction intensity have been proposed.

  Patent Document 1 is a method for estimating the strength after hot reaction of blended coal coke, wherein the reaction rate of blended coal coke (hereinafter referred to as “CRI”) is determined based on the weighted average value of CRI of plain coal coke, A method for estimating the strength after coke hot reaction is disclosed, wherein the CSR of the blended coal coke is estimated based on the CRI of the blended coal coke and the surface fracture strength of the blended coke.

JP 2005-232350 A

  However, the above estimation method requires CRI only from coal blending conditions and the like, and does not consider the operation conditions in the coke oven. For this reason, the estimation accuracy of CRI and CSR was low. It is an object of the present invention to improve the estimation accuracy of CSR as compared with the prior art.

The inventors of the present invention examined the above operating conditions, and found that the coke arrival temperature, the coke porosity, and the coke oven width have a great influence on the CRI. Based on the above findings, the estimation method of the strength after coke hot reaction according to the present invention is based on (1) the reaction rate of the blended coal coke (hereinafter referred to as “CRI”) based on the weighted average value of the CRI of the solid coal coke. And the CRI of the obtained coal blend coke (hereinafter referred to as “CRI of the blended coal coke before correction”) obtained from the coke temperature, the porosity of the coke and the furnace width of the coke oven. A third step of estimating the CSR of the blended coke based on the second step of correcting based on the operating conditions, and the CRI of the blended coke after the correction and the surface fracture strength of the blended coke (hereinafter referred to as “DI1506”). of the step, the possess, in the second step, as the relationship between the furnace width and the CRI of variation, based on the relationship furnace width larger the CRI drops, the Against CRI of coal blend coke obtained in the first step, and correcting the difference between the CRI of the amount of change in the furnace width during operation.

  The inventors of the present invention have studied the above operating conditions and found that the accuracy of CRI estimation is further improved by adding the temperature increase rate of the coke oven to the CRI estimation conditions.

  According to the present invention, it is possible to improve the estimation accuracy of CSR of blended coal coke.

It is a model figure of the estimation method which estimates the intensity | strength after the coke hot reaction (embodiment 1). It is the figure which plotted the data, taking the weighted average value of CRI of solid coal coke on the horizontal axis, and the actual CRI of blended coal coke on the vertical axis. It is the figure which took the weighted average value of TD on the horizontal axis, and took the difference (ΔCRI) between the CRI of blended coal coke and the weighted average value of CRI of plain coal coke on the vertical axis. It is a correlation diagram of coke arrival temperature and CRI. It is a correlation diagram of the porosity of coke and CRI. It is a correlation diagram of the furnace width and CRI of a coke oven. It is the figure which plotted the relationship between the CRI after correction | amendment which correct | amended CRI before correction | amendment by operation conditions, and the measured value of CRI (Example). It is the figure which plotted the relationship between CRI before correction | amendment, and the measured value of CRI (comparative example). It is the figure which plotted the relationship between the CSR estimated by the 3rd step, and the measured value of CSR (Example). It is the figure which plotted the relationship between CSR estimated without correct | amending by operation conditions, and the measured value of CSR (comparative example). It is a model figure of the estimation method of the intensity | strength after the coke hot reaction (embodiment 2). It is a correlation figure of the temperature increase rate of a coke oven, and CRI. FIG. 10 is a relationship diagram in which a relationship between a corrected CRI obtained by correcting the CRI before correction under the operation conditions of Embodiment 2 and an actual measured value of CRI is plotted (Example). It is the figure which plotted the relationship between the CSR estimated by the 3rd step, and the measured value of CSR. It is the figure which plotted CRI of the combination coal coke on the horizontal axis, CSR of the combination coal coke on the vertical axis, and stratified by the surface fracture strength of the coke.

(First embodiment)
A method for estimating the strength after the coke hot reaction according to the present embodiment will be described. FIG. 1 shows a model of an estimation method for estimating the strength after hot coke reaction. The estimation method of the post-hot reaction strength (hereinafter also referred to as “CSR”) of the blended coal coke according to the present embodiment is obtained by calculating the reaction rate of the blended coal coke (hereinafter also referred to as “CRI”) as simple coal coke. The CRI of the blended coal coke thus obtained based on the weighted average value of the CRI (hereinafter also referred to as “CRI of the blended coal coke before correction”) is calculated as the coke arrival temperature, the coke In the second step of correcting based on the operating conditions consisting of the porosity and the furnace width of the coke oven, the CRI of the blended coke after this correction and the surface fracture strength of the blended coke (hereinafter also referred to as “DI ¹⁵⁰ ₆ ”) And a third step of estimating the CSR of the blended coal coke based on the third step.

  First, the first step will be described. The CRI of the blended coal coke before correction is obtained by weighted average of the CRI of each simple coal constituting the blended coal charged in the coke oven. Regarding the CRI of coke, additivity is established, and it is possible to estimate the CRI of the blended coal by weighted averaging the CRI of each simple coal constituting the blended coal. FIG. 2 shows the result of plotting data with the weighted average value of CRI of plain coal coke on the horizontal axis and the actual CRI of blended coal coke on the vertical axis. As is apparent from the figure, the CRI of the blended coal coke can be estimated from the CRI weighted average value of the plain coal coke. Here, CRI means that 200 g of coke adjusted to a size of 20 ± 1 mm is reacted under the conditions of gas composition: carbon dioxide (100%), reaction temperature 1100 ° C., reaction time 2 hours, It is an index indicating the mass decrease rate due to the reaction, which is expressed by (mass before reaction−mass after reaction) / mass before reaction × 100.

In the measurement of CRI, each simple coal is first carbonized in a test carbonization furnace, and the CRI is measured by the above method. There is no particular designation as a carbonization method in the test carbonization furnace, and the carbonization may be performed by an ordinary method. For example, the method described in Coke Circular Vol. 30 No. 4 (1981), pages 239 to 245 can be used.
In addition, the carbonization conditions (temperature increase rate, porosity, coke arrival temperature, furnace width) in the test carbonization furnace are not particularly specified, and can be set within the range of normal operation conditions.

    A more preferable method for estimating the CRI of the blended coal coke from the weighted average value of the CRI of the plain coal coke will be described.

    When the relationship between the CRI of blended coal coke and the weighted average value of CRI of plain coal coke was investigated in detail, when the weighted average value of total expansion rate (TD) of simple coal coke decreased, the blended coal coke It became clear that the CRI of the present invention shows a value larger than the weighted average value of the CRI of the plain coal coke. In FIG. 3, the horizontal axis represents the weighted average value of TD, and the vertical axis represents the difference between the CRI of blended coal coke and the CRI of plain coal coke (CRI difference), and the data is plotted. . The above facts are clear from this figure.

    Here, the total expansion rate TD of coal is a total expansion rate measured by a dilatometer of JIS M 8801, and is expressed as the sum of the shrinkage rate and the expansion rate.

    The reason why the CRI of the blended coal becomes larger than the weighted average value of the plain coal CRI when the total expansion rate of the coal is low can be considered as follows. That is, when the total expansion rate is low, the entire coal particle surface is not adhered. For this reason, it is considered that the gas easily diffuses in the pore-to-pore connection portions (that is, the interparticle bonding portions), and as a result, the CRI of the blended coal is higher than the weighted average value of the simple coal CRI.

    In the present invention, as a more preferable method for obtaining the CRI of the blended coal coke before performing the correction according to the operation condition of the second step described later, the CRI weighted average value of the solid coal coke, The relationship with the weighted average value of the expansion coefficient (TD) is clarified by a statistical method, for example, the weighted average value of the solid coal CRI is corrected as a linear function of the TD weighted average value according to the operating condition of the second step. An equation for estimating the CRI of the blended coal coke prior to performing can be established. This is preferable because the CRI of the blended coal coke before correction according to the operation condition in the second step described later can be obtained with higher accuracy.

  Next, the second step will be described. In the second step, the CRI of the pre-corrected blended coke obtained in the first step is determined based on the coke arrival temperature as the operating condition, the porosity of the coal charged into the coke oven, and the furnace width of the coke oven. to correct. The temperature increase rate was 4 ° C./min.

(Coke reaching temperature)
Here, the coke arrival temperature is the coke temperature when coke is extruded from the coke oven. Since the coke temperature varies in the furnace width direction of the coke oven, the average value of the temperature in the furnace width direction is defined as the coke reached temperature in this specification. The coke arrival temperature depends on the carbonization time in the coke oven, the temperature of the combustion chamber of the coke oven, and the temperature of the blended coal to be charged.

FIG. 4 is a correlation diagram between the coke arrival temperature and the amount of change in CRI. By setting the temperature rise rate of the coke oven to 4 ° C / min, the porosity of the coal charged into the coke oven to 50%, the furnace width to 450 mm, and changing the coke arrival temperature, the coke arrival temperature and the CRI The correlation with the amount of change was calculated. As shown in the figure, there is a correlation between the coke arrival temperature and the amount of change in CRI, and it was found that the CRI decreases as the coke arrival temperature increases. Thus, it is considered that the CRI decreases because the coke crystallinity increases as the coke arrival temperature increases, resulting in a dense carbon structure.

  Specifically, the difference between the measured coke arrival temperature and the reference arrival temperature (1000 ° C. in the present embodiment) is obtained, and ΔCRI (hereinafter referred to as “ΔCRI− I) ”. The data format of FIG. 4 is a data table in which the coke arrival temperature and ΔCRI-I are associated with each other, or a calculation program that calculates ΔCRI-I by substituting the measured coke arrival temperature into a function equation (primary equation). May be.

(Coke porosity)
The porosity of coke can be calculated using the bulk density of the coal blend charged in the coke oven. FIG. 5 is a correlation diagram between the coke porosity and the amount of change in CRI. Correlation between the coke porosity and the amount of change in CRI by changing the coke porosity by setting the heating rate of the coke oven to 4 ° C / min, the coke arrival temperature to 1000 ° C, and the furnace width to 450 mm. Sought a relationship. As shown in the figure, there is a correlation between the porosity of the coke and the amount of change in the CRI, in which the CRI decreases as the coke porosity decreases. Thus, it is thought that CRI falls because the specific surface area of coke falls because porosity falls.

  Specifically, the difference between the measured coke porosity and the reference porosity (50% in the present embodiment) is obtained, and ΔCRI (hereinafter referred to as “ΔCRI”), which is the amount of change in CRI, while referring to FIG. -II "). The data format of FIG. 5 is a data table in which the coke porosity and the value of ΔCRI-II are associated, or a calculation program for calculating ΔCRI-II by substituting the measured coke porosity into a functional equation. May be.

(About the width of the coke oven)
FIG. 6 is a correlation diagram between the furnace width of the coke oven and the amount of change in CRI. By changing the furnace width of the coke oven by setting the temperature rise rate of the coke oven to 4 ° C / min, the coke arrival temperature to 1000 ° C, and the porosity of the coal charged into the coke oven to 50%, The correlation between the furnace width of the furnace and the amount of change in CRI was obtained. As shown in the figure, there is a correlation between the furnace width of the coke oven and the amount of change in CRI, and it has been found that the CRI decreases as the furnace width of the coke oven increases. Thus, the reason why the CRI decreases will be described. Gas generated from coal during carbonization moves to the furnace wall side through pores in the coke layer. At this time, it is considered that pyrolytic carbon is deposited in the pores and the pores are reduced, the specific surface area of the coke is reduced, and as a result, the CRI is reduced.

  By the way, in recent construction of a coke oven, in order to improve labor productivity, the oven width of the coke oven is often designed larger than before. Therefore, when the furnace width of the coke oven changes, it is very important to correct the CRI according to the degree of the change in order to improve the CRI estimation accuracy.

  Specifically, the difference between the measured furnace width of the coke oven and the reference furnace width (450 mm in this embodiment) is obtained, and ΔCRI (hereinafter referred to as “ΔCRI”), which is the amount of change in CRI, with reference to FIG. -III "). The data format of FIG. 6 is a calculation table for calculating ΔCRI-III by substituting the measured coke oven width into a data table in which the furnace width of the coke oven is associated with the numerical value of ΔCRI-III, or a functional equation. It may be.

  As described above, the relationships in FIGS. 4 to 6 are typical conditions in normal operation (conditions where the coke arrival temperature is 1000 ° C., the porosity is 50%, the furnace width is 450 mm, and the heating rate is 4 ° C./min). As a standard operating condition, the coke reached temperature was set to 1000 ° C, the porosity was set to 50%, and the furnace width was set to 450 mm. However, even if the standard operating condition is different, it is within the normal operating range. It has been separately found that the relationships of FIGS. 4 to 6 are maintained. For example, FIG. 4 shows that the temperature rise rate of the coke oven is 4 ° C./min, the porosity of the coal charged into the coke oven is set to 50%, the furnace width is set to 450 mm, and the coke arrival temperature is changed, Although it is a figure which showed the correlation of coke arrival temperature and CRI, even when a furnace width is 550 mm, the correlation of FIG. 4 is maintained. Therefore, the CRI can be corrected using the relationships shown in FIGS.

  The CRI correction method will be specifically described below. First, in the first step, the CRI of the blended coke before correction is the CRI of coke obtained by carbonizing each simple coal constituting the blended coal charged into the coke oven in the test carbonization furnace. It is measured and estimated by the weighted average value of the CRI of each simple coal, and more preferably, the weighted average value of the total expansion rate of the simple coal is also considered. At this time, if the production conditions of coke in the test carbonization furnace of each single coal change, the weighted average value of CRI of each single coal changes, so the estimated value of CRI of the blended coke before correction also changes. . Therefore, the CRI correction according to the operating conditions in the second step is based on the operating conditions based on the coke production conditions (coke arrival temperature, porosity, furnace width) of each simple coal in the first step. It may be set and performed using the relationships shown in FIGS. For example, it is assumed that the coke arrival temperature at the time of manufacturing the coke of the test carbonization furnace of each simple coal in the first step is 1050 ° C., and the coke arrival temperature in actual operation is 900 ° C. At this time, from FIG. 4, ΔCRI-I is 3.6 − (− 1.8) = 5.4. Similar corrections can be made for other operating conditions (porosity, furnace width), and ΔCRI-II and ΔCRI-III can be obtained respectively. Since ΔCRI-I, ΔCRI-II, and ΔCRI-III are additive, a total value is used as a correction value. Therefore, as correction of CRI, the value of ΔCRI−I) + (ΔCRI−II) + (ΔCRI−III) is added to CRI of coke obtained by carbonizing each simple coal in a test carbonization furnace. You can ask for it.

  The effect of correcting the CRI under these operating conditions will be described. FIG. 7 shows a correction in which the CRI of the blended coke before correction is corrected by ΔCRI-I corresponding to the coke arrival temperature, ΔCRI-II corresponding to the coke porosity, and ΔCRI-III corresponding to the furnace width of the coke oven. It is the figure which plotted the relationship between subsequent CRI and the measured value of CRI (Example). FIG. 8 is a graph plotting the relationship between the CRI before correction and the measured value of CRI (comparative example). As the plot value moves away from the reference line drawn in these figures, the estimation accuracy decreases. With reference to these figures, in the example of the present invention, more data is plotted in a region closer to the reference line than in the comparative example. Therefore, it has been proved that the CRI estimation accuracy can be improved by correcting the CRI of the blended coal coke before correction with the operation conditions including the coke arrival temperature, the coke porosity, and the coke oven width.

Next, the third step will be described. In the third step, based on the DI ^0.99 ₆ of CRI and coal blend coke coal blend coke after correction obtained in the second step, to estimate the CSR of coal blend coke.

When the relationship between the CSR of blended coal coke and the CRI of blended coal coke is examined, there is a strong correlation between the two, and the relationship between the two is affected by the surface fracture strength of the coke. That, CSR of coal blend coke from DI ^0.99 ₆ Metropolitan of CRI and coal blend coke coal blend coke after correction can be accurately estimated.

Here, DI ¹⁵⁰ ₆ which is the surface breaking strength of coke indicates a mass ratio of a lump of 6 mm or more after an impact of 150 rotations is given by a drum tester.

When the CRI of the blended coal coke is taken on the horizontal axis, the CSR of the blended coal coke is taken on the vertical axis, and the data is plotted by stratification according to the surface fracture strength of the coke, the data shown in FIG. 15 can be obtained. In FIG. 15, for example, what is displayed as “DI <85” means 84 ≦ DI ¹⁵⁰ ₆ <85, and is classified into six layers according to the coke surface fracture strength. As is clear from this figure, the CSR of the blended coke has a good correlation with the CRI at each level of the coke surface fracture strength. The higher the coke surface fracture strength, the higher the CSR value. You can see that The reason why the CSR of the blended coal coke is determined by the CRI and the surface fracture strength of the blended coal coke is considered as follows. CRI is an index indicating a reaction rate in a certain reaction time, and a coke having a high CRI has a fragile structure. Therefore, it is considered that the higher the CRI, the higher the pulverization rate when an impact is applied with the I-type drum, and the lower the CSR. Further, in the case of the same reaction rate (same CRI), the higher the surface fracture strength of the original coke before the reaction, the greater the impact dust resistance, so the CSR is considered to be higher.

Therefore, as a specific method for estimating the coke CSR from CRI and DI ¹⁵⁰ ₆ , the relationship between the three of CSR, CRI, and DI ¹⁵⁰ ₆ shown in FIG. CSR can be estimated. For example, it can be recommended to formulate an equation for estimating CSR as a linear function of CRI, DI ¹⁵⁰ ₆ .

Here, a method for estimating the surface fracture strength DI ¹⁵⁰ ₆ of coke will be described. As a means for estimating the surface fracture strength DI ¹⁵⁰ ₆ , for example, the degree of void filling during coal softening defined by the following equation (1) is determined from the specific volume during coal softening and the bulk density of coal during charging in the coke oven. Further, the relationship between the degree of void filling during coal softening and the surface fracture strength of coke is obtained in advance. Thereby, the surface fracture strength of coke can be estimated from the specific volume of coal to be used next at the time of softening the coal and the bulk density of the coal at the time of charging into the coke oven.
Void filling degree during coal softening (-) = specific volume during coal softening (cm ³ / g) × coal bulk density of the coke RoSo Nyutoki (g / cm ³⁾ (1)
Here, the specific volume at the time of coal softening can be calculated by, for example, the following equation (2) from the expansion rate b (%) measured by a dilatometer of JIS M8801.
Specific volume at the time of coal softening (cm ³ / g)
= Coal volume at maximum expansion (cm ³ ) / Coal charge to dilatometer (g)
= 0.96π (1 + b / 100) / Coal charge to dilatometer (g) (2)

That is, first, the specific volumes at the time of softening of various coals are measured, and the coals are simply or blended and dry-distilled to produce coke. At that time, the bulk density at the time of charging coal of simple coal or blended coal is measured.
Next, for example, DI ¹⁵⁰ ₆ measured by the drum test method of JIS K2151 is measured as the surface fracture strength of the coke of the produced simple coal or blended coal.
Furthermore, the relationship between the degree of void filling at the time of softening the coal calculated from the specific volume at the time of coal softening and the bulk density at the time of coal charging, and the surface fracture strength DI ¹⁵⁰ ₆ of the coke, It asks beforehand about blend charcoal. In addition, the specific volume at the time of coal softening should just use a measured value in the case of plain coal, and may use the weighted average value of the measured value of each coal in the case of blended coal.
In order to estimate the surface fracture strength, the specific volume at the time of softening of the coal to be used is measured, and the bulk density at the time of coal charging at the time of dry distillation is further predicted by a known method from the coal moisture and particle size. From the value, the degree of void filling during softening of the coal is calculated by the equation (1), and the surface of the coke is calculated based on the relationship between the degree of void filling during softening of the coal and the surface fracture strength of the coke, which is obtained in advance The fracture strength can be estimated.

  FIG. 9 is a graph plotting the relationship between the estimated CSR value estimated using the first to third steps of the present invention and the measured CSR value (Example). FIG. 10 shows the estimated CSR value and the estimated CSR value using the pre-corrected CRI estimated without correcting the operating conditions in the second step of the first to third steps of the present invention. It is the figure which plotted the relationship with an actual measurement value (comparative example). As the plot value moves away from the reference line drawn in these figures, the estimation accuracy decreases. With reference to these figures, in the example of the present invention, more data is plotted in a region closer to the reference line than in the comparative example. Therefore, by correcting the CRI of the blended coal coke before correction with the operating conditions consisting of the coke arrival temperature, the coke porosity, and the furnace width of the coke oven, and estimating the CSR based on this, the estimation accuracy of the CSR is higher than before. Proved to be even higher.

(Second Embodiment)
A more preferable embodiment of the method for estimating the strength after the coke hot reaction according to the present embodiment will be described. FIG. 11 shows a model of a method for estimating the strength after the coke hot reaction. The method for estimating the strength after coke hot reaction according to the present embodiment is a method for estimating the strength after hot reaction of blended coal coke (hereinafter referred to as “CSR”), and the reaction rate of the blended coal coke (hereinafter referred to as “CRI”). )) Based on the weighted average value of the CRI of the plain coal coke and the CRI of the obtained blended coke (hereinafter referred to as “CRI of the blended coal coke before correction”). , Second step of correction based on operating conditions consisting of coke arrival temperature, coke porosity, coke oven width and coke oven heating rate, and CRI of the blended coke and blended coke surface after this correction And a third step of estimating the CSR of the blended coke based on the breaking strength (hereinafter referred to as “DI ¹⁵⁰ ₆ ”).

  In the first embodiment, the CRI of the blended coal coke before correction is corrected based on the operation conditions including the coke arrival temperature, the coke porosity, and the furnace width of the coke oven. However, in this embodiment, the coke oven is added to the operation conditions. Is added. Since the first step and the third step are the same as those in the first embodiment, description thereof will not be repeated.

(Coke oven temperature rise rate)
The temperature rising rate of the coke oven means a temperature rising rate in a temperature range of 400 to 500 ° C. where the coal is softened and melted. In general, the temperature increase rate of the coke oven depends on the temperature of the combustion chamber of the coke oven and the temperature of the blended coal to be charged, and therefore varies in the furnace width direction of the coke oven. For this reason, in this specification, the average value of the heating rate in the furnace width direction is defined as the heating rate of the coke oven.
FIG. 12 is a correlation diagram between the temperature increase rate of the coke oven and the amount of change in CRI. By setting the coke temperature to 1000 ° C., the porosity of the coal charged into the coke oven to 50%, the furnace width to 450 mm, and changing the temperature rise rate of the coke oven, Correlation with the amount of change in CRI was determined. As shown in the figure, there is a correlation between the temperature increase rate of the coke oven and the amount of change in CRI, and it has been found that the CRI decreases as the temperature increase rate of the coke oven increases. As described above, the reason why the CRI is lowered is considered to be that when the temperature increase rate of the coke oven is increased, the softening and melting characteristics of the coal are improved, and the anisotropic structure of the coke is developed. .

  Specifically, the difference between the measured temperature increase rate of the coke oven and the reference temperature increase rate (4 ° C./min in the present embodiment) is obtained, and ΔCRI which is the amount of change in CRI is obtained with reference to FIG. (Hereinafter referred to as “ΔCRI-IV”). The data format of FIG. 12 is a data table in which the temperature rising rate of the coke oven and ΔCRI-IV are associated with each other, or ΔCRI-IV is obtained by substituting the measured temperature rising rate of the coke oven into a function equation (primary equation). It may be a calculation program for calculating.

  The effect of correcting the CRI with the coke arrival temperature, the coke porosity, the coke oven width, and the coke oven heating rate will be described with reference to a comparative example. FIG. 13 shows the CRI of the blended coke before correction, ΔCRI-I corresponding to the coke temperature, ΔCRI-II corresponding to the coke porosity, ΔCRI-III corresponding to the coke oven width, and the coke oven ascending It is the relationship figure which plotted the relationship between the CRI after correction | amendment correct | amended by (DELTA) CRI-IV corresponding to a temperature rate, and the measured value of CRI (Example). For the comparative example, FIG. 8 similar to that of the first embodiment is used.

  With reference to these figures, in the example of the present invention, more data is plotted in a region closer to the reference line than in the comparative example. Therefore, by correcting the CRI of the blended coke before correction with the operating conditions consisting of the coke arrival temperature, the coke porosity, the coke oven width and the coke oven heating rate, the estimation accuracy is improved compared to the conventional case. It was proved. Furthermore, referring to FIG. 7 and FIG. 13, it was proved that the estimation accuracy of CRI is further improved by adding the temperature increase rate of the coke oven to the operation conditions as the correction information.

  FIG. 14 is a diagram in which the relationship between the estimated CSR value estimated using the first to third steps of the present invention and the measured CSR value is plotted (Example). As for the comparative example, FIG. 10 was used as in the first embodiment. As the plot value moves away from the reference line drawn in these figures, the estimation accuracy decreases. By comparing these FIG. 10 and FIG. 14, in the example of the present invention, more data is plotted in a region closer to the reference line than in the comparative example. Therefore, by correcting the CRI of the blended coal coke before correction with the operating conditions consisting of the coke arrival temperature, the coke porosity, the coke oven width and the coke oven heating rate, and estimating the CSR based on this, It has been proved that the estimation accuracy of CSR is higher than before. Furthermore, referring to FIG. 9 and FIG. 14, it was proved that the estimation accuracy of CSR is further improved by adding the temperature increase rate of the coke oven to the operation conditions as the correction information.

Claims (5)

An estimation method of strength after hot reaction (hereinafter referred to as “CSR”) of blended coal coke,
A first step of determining a reaction rate of blended coal coke (hereinafter referred to as “CRI”) as a weighted average value of CRI of plain coal coke;
The second CRI of the blended coal coke thus obtained (hereinafter referred to as “CRI of the blended coal coke before correction”) is corrected based on the operation conditions including the coke arrival temperature, the coke porosity, and the coke oven width. And the steps
A third step of estimating the CSR of coal blend coke based on the CRI and coal blend coke surface fracture strength of the coal blend coke after the correction (hereinafter referred to as "DI1506".), Have a,
In the second step,
As the relationship between the furnace width and the amount of change in CRI, the CRI of the blended coal coke obtained in the first step is based on the relationship between the furnace width at the time of operation, based on the relationship that the CRI decreases as the furnace width increases. A method for estimating strength after coke hot reaction, which comprises correcting a difference from a change amount of CRI .   The said operation conditions consist of the said coke arrival temperature, the porosity of the said coke, the furnace width of the said coke oven, and the temperature increase rate of a coke oven, The estimation of the post-coke hot reaction intensity | strength of Claim 1 characterized by the above-mentioned. Method. In the second step,
Based on the relationship between the coke arrival temperature and the CRI change amount, the difference between the CRI change amount at the coke arrival temperature during operation is corrected with respect to the CRI of the blended coke obtained in the first step. ,
Based on the relationship between the coke porosity and the change in CRI, the difference between the CRI change in the coke porosity during operation and the CRI of the blended coke obtained in the first step is calculated as follows. estimation method coke hot strength after reaction according to claim 1, characterized in Rukoto to correct complement. In the second step,
Based on the relationship between the coke arrival temperature and the change amount of CRI, the difference in the change amount of CRI at the coke arrival temperature at the time of operation is corrected with respect to the CRI of the blended coal coke obtained in the first step.
Based on the relationship between the coke porosity and the change in CRI, the difference between the CRI change in the coke porosity during operation and the CRI of the blended coke obtained in the first step is calculated as follows. Correct ,
Based on the relationship between the rate of temperature rise and the amount of change in CRI, the difference between the amount of change in CRI at the rate of temperature rise during operation is corrected with respect to the CRI of blended coal coke obtained in the first step. The method for estimating strength after hot coke reaction according to claim 2, wherein: In the first step, the CRI of the blended coal coke before the correction is changed to a weighted average value of the CRI of the plain coal coke and a weighted average value of the total expansion rate of the simple coal coke (hereinafter referred to as “TD”). The method for estimating the strength after hot coke reaction according to any one of claims 1 to 4, wherein the strength is calculated based on the above.

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