WO2012029984A1 - 冶金用コークスの製造方法 - Google Patents

冶金用コークスの製造方法 Download PDF

Info

Publication number
WO2012029984A1
WO2012029984A1 PCT/JP2011/070315 JP2011070315W WO2012029984A1 WO 2012029984 A1 WO2012029984 A1 WO 2012029984A1 JP 2011070315 W JP2011070315 W JP 2011070315W WO 2012029984 A1 WO2012029984 A1 WO 2012029984A1
Authority
WO
WIPO (PCT)
Prior art keywords
coal
ddpm
mass
distance
measured
Prior art date
Application number
PCT/JP2011/070315
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
喜代志 深田
泉 下山
英和 藤本
哲也 山本
広行 角
勇介 土肥
光輝 照井
Original Assignee
Ｊｆｅスチール株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Ｊｆｅスチール株式会社 filed Critical Ｊｆｅスチール株式会社
Priority to CN201180051087.XA priority Critical patent/CN103180413B/zh
Priority to KR1020137007936A priority patent/KR101441263B1/ko
Publication of WO2012029984A1 publication Critical patent/WO2012029984A1/ja

Links

Images

Classifications

    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
    • C10B57/00—Other carbonising or coking processes; Features of destructive distillation processes in general
    • C10B57/04—Other carbonising or coking processes; Features of destructive distillation processes in general using charges of special composition

Definitions

  • This invention evaluates coal for coke production using a test method that accurately evaluates the softening and melting characteristics during coal dry distillation, and improves coke strength by adjusting the proportion of coal contained in the blended coal based on the results.
  • the present invention relates to a method for producing metallurgical coke.
  • iron ore and coke are charged alternately in the blast furnace, each is filled in layers, and the iron ore and coke are heated with hot hot air blown from the tuyere. In addition, it is necessary to reduce iron ore with CO gas generated from coke.
  • metallurgical coke is required to produce robust coke in order to maintain air permeability in a vertical furnace such as a blast furnace.
  • metallurgical coke measures coke strength by measuring the coke strength by a rotational strength test or the like shown in JIS K 2151.
  • Coal is softened and melted by dry distillation and adheres to each other to form coke. Therefore, the difference in the softening and melting characteristics of coal has a great influence on the coke strength, and evaluation of the softening and melting characteristics of coal is indispensable from the viewpoint of coke quality control.
  • the softening and melting property is a property of softening and melting when coal is heated, and is usually measured and evaluated by the fluidity, viscosity, adhesiveness, expandability, etc. of the softened melt.
  • a general method for measuring the fluidity at the time of softening and melting includes a coal fluidity test method based on the Gisela plastometer method specified in JIS M8801.
  • Gisela plastometer method coal pulverized to 425 ⁇ m or less is put in a predetermined crucible, heated at a specified temperature increase rate, and the rotation speed of a stirring bar to which a specified torque is applied is read with a scale plate, and ddpm (dial division) per minute).
  • Patent Document 1 describes a method of measuring torque while rotating a rotor at a constant rotational speed.
  • Dynamic viscoelasticity measurement is the measurement of viscoelastic behavior seen when a force is applied periodically to a viscoelastic body.
  • the method described in Patent Document 2 is characterized in that the viscosity of the softened molten coal is evaluated by the complex viscosity in the parameters obtained by the measurement, and the viscosity of the softened molten coal at an arbitrary shear rate can be measured. .
  • a dilatometer method As a general method for measuring the expansibility during softening and melting of coal, there is a dilatometer method defined in JIS M8801.
  • coal pulverized to 250 ⁇ m or less is molded by a specified method, placed in a predetermined crucible, heated at a specified rate of temperature rise, and a detection rod placed on the top of the coal is used to measure changes in coal displacement over time. It is a method to measure.
  • the coke strength is controlled to a certain value or more by setting the target coke strength higher in advance in consideration of the variation in coke strength derived from the inaccuracy of the softening and melting characteristics. Further, since it is necessary to use a relatively expensive coal excellent in softening and melting characteristics and to set the average quality of the blended coal to be higher, the cost is increased. In order to solve these problems, it is desired to develop a new method for evaluating the softening and melting characteristics of coal that can better control the coke strength and to develop a coke strength control method using the same.
  • the coal at the time of softening and melting is softened and melted while being constrained by adjacent layers. Since the thermal conductivity of coal is small, the coal is not uniformly heated in the coke oven, and the state differs from the coke layer, the softened molten layer, and the coal layer from the furnace wall side that is the heating surface. Since the coke oven itself expands somewhat during dry distillation but hardly deforms, the softened and melted coal is constrained by the adjacent coke layer and coal layer.
  • the crack generated in the coke layer is considered to have a width of about several hundred microns to several millimeters, and is larger than the voids and pores between coal particles having a size of about several tens to several hundreds of microns. Therefore, it is considered that coarse defects generated in such a coke layer are not only caused by pyrolysis gas and liquid substances, which are by-products generated from coal, but also permeate softened and melted coal itself. Further, it is expected that the shear rate acting on the softened and melted coal at the time of infiltration varies from brand to brand.
  • the Giselaer plastometer method is problematic in that it does not take into account any restraint or infiltration conditions for measurement in a state where coal is filled in a container. Moreover, this method is not suitable for the measurement of coal showing high fluidity. The reason is that, when measuring coal showing high fluidity, a phenomenon that the inner wall of the container becomes hollow (Weissenberg effect) occurs, the stirrer may idle, and the fluidity may not be evaluated correctly ( For example, refer nonpatent literature 1.).
  • the method of measuring torque by the constant rotation method is deficient in that it does not consider the constraint condition and the penetration condition.
  • the measurement under a constant shear rate it is impossible to correctly compare and evaluate the softening and melting characteristics of coal as described above.
  • the dynamic viscoelasticity measuring device is a device that can measure viscosity under an arbitrary shear rate with viscosity as a softening and melting characteristic. Therefore, if the shear rate at the time of measurement is set to a value that acts on the coal in the coke oven, the viscosity of the softened molten coal in the coke oven can be measured. However, it is usually difficult to measure or estimate the shear rate in each coke oven in advance.
  • the method of measuring the adhesion to coal using activated carbon or glass beads as the softening and melting characteristics of coal tries to reproduce the infiltration conditions for the presence of coal layer, but does not simulate the coke layer and coarse defects There is a problem in terms. Moreover, the point which is not a measurement under restraint is also insufficient.
  • Patent Document 4 discloses a method for measuring the expansibility of coal in consideration of the movement of gas and liquid substances generated from coal by arranging a material having a through path on the coal bed.
  • the conditions for evaluating the infiltration phenomenon in the coke oven are not clear.
  • the relationship between the infiltration phenomenon of the coal melt and the softening and melting behavior is not clear, and there is no suggestion about the relationship between the infiltration phenomenon of the coal melt and the quality of the coke to be produced. It does not describe the production of coke.
  • the softening and melting characteristics of coal cannot be measured in a state that sufficiently simulates the environment of the softened and melted coal and the surrounding environment in the coke oven.
  • an object of the present invention is to accurately evaluate the softening and melting characteristics of coal used in blended coal by measuring the softening and melting characteristics of coal in a coke oven in a state simulating the environment surrounding the softened and molten coal. Then, it is providing the method for manufacturing the metallurgical coke excellent in quality, such as intensity
  • a method for producing metallurgical coke by dry distillation of blended coal composed of multiple brands of coal Predetermining the brand of coal contained in the blended coal, The softening and melting characteristics of the determined brand of coal are determined by placing a material having through holes on the upper and lower surfaces of the coal sample filled in the container and heating the coal sample to penetrate the through hole.
  • Pre-assessment based on penetration distance and maximum ghiser flow rate The total blending ratio of brand coal having a permeation distance of 1.6 times or more with respect to the average penetration distance of brand coal having a Gieseler maximum fluidity of 100 ddpm or more and 500 ddpm or less contained in the blended coal is 10 mass% or less (0 mass% Including),
  • a method for producing metallurgical coke [2] A method for producing metallurgical coke by dry distillation of blended coal comprising a plurality of brands of coal, The softening and melting characteristics of coal are determined by placing a material having through-holes on the upper and lower surfaces of the coal sample filled in the container and heating the coal sample to penetrate the coal into the through-hole and the highest Gieseler.
  • a linear regression equation passing through the origin is obtained based on the logarithm value of the ghiser cell's maximum fluidity and the measured value of the penetration distance of one or more coals having a ghiser cell's maximum fluidity of 30 ddpm or more and 1000 ddpm or less, Total of coals having a permeation distance of 1.6 times or more of the permeation distance when the Gieseller flow rate is 200 ddpm in the linear regression equation and having a maximum flow rate of 1000 ddpm or more as measured by the Gieseller Plastometer method
  • the blending ratio is 10 mass% or less (
  • a method for producing metallurgical coke by dry distillation of blended coal comprising a plurality of brands of coal, The softening and melting characteristics of coal are determined by placing a material having through-holes on the upper and lower surfaces of the coal sample filled in the container and heating the coal sample to penetrate the coal into the through-hole and the highest Gieseler.
  • a method for producing metallurgical coke by dry distillation of blended coal comprising a plurality of brands of coal, The softening and melting characteristics of coal are determined by placing a material having through-holes on the upper and lower surfaces of the coal sample filled in the container and heating the coal sample to penetrate the coal into the through-hole and the highest Gieseler.
  • Coal is pulverized so that a particle size of 2 mm or less is 100% by mass, and the pulverized coal is filled in a container with a packing density of 0.8 g / cm 3 and a layer thickness of 10 mm.
  • a glass bead having a diameter of 2 mm is arranged on the sample so as to have a layer thickness of an infiltration distance or more, (3) Heating in an inert gas atmosphere from room temperature to 550 ° C. at a heating rate of 3 ° C./min while applying a load from the top of the glass beads to 50 kPa, (4) The penetration distance of the molten sample that has penetrated into the glass bead layer is measured.
  • a method for producing coke for metallurgy by dry distillation of blended coal comprising a plurality of brands of coal, The total blending ratio of coal having an infiltration distance measured by the following methods (1) to (4) of less than 15 mm and a maximum fluidity measured by the Gisela plastometer method of 1000 ddpm or more is 10 to 100 mass%.
  • a method for producing metallurgical coke characterized in that: (1) Coal is pulverized so that a particle size of 2 mm or less is 100% by mass, and the pulverized coal is filled in a container with a packing density of 0.8 g / cm 3 and a layer thickness of 10 mm.
  • a glass bead having a diameter of 2 mm is arranged on the sample so as to have a layer thickness of an infiltration distance or more, (3) Heating in an inert gas atmosphere from room temperature to 550 ° C. at a heating rate of 3 ° C./min while applying a load from the top of the glass beads to 50 kPa, (4) The penetration distance of the molten sample that has penetrated into the glass bead layer is measured.
  • the defect structure existing around the coal softening and melting layer in the coke oven particularly the coke layer adjacent to the softening and melting layer, which is considered to have a great influence on the coal softening and melting characteristics in the coke oven. Since it is possible to simulate the effects of existing cracks and to evaluate the coal softening and melting characteristics in a state where the restraint conditions around the softening melt in the coke oven are appropriately reproduced, the conventional softening and melting characteristics of Coal-derived defects exhibiting excessive fluidity that could not be detected only by the evaluation method can be reduced, and high-strength metallurgical coke can be produced.
  • the present inventors have made it possible to measure the softening and melting characteristics while simulating the surrounding environment of the softened and melted coal in the coke oven, and eagerly researched the relationship between the measured softening and melting characteristics “penetration distance” and coke strength.
  • the softening and melting characteristics obtained by the method of the present invention measured in a state simulating the surrounding environment of the softened and melted coal, even for coal that has little difference in the softening and melting characteristics reported so far, Found that there was a difference.
  • coke was produced by blending coal having a difference in softening and melting characteristics measured by the method of the present invention, it was found that their coke strengths were also different, leading to the present invention.
  • FIG. 1 shows an example of a measuring device for softening and melting characteristics (penetration distance) used in the present invention.
  • FIG. 1 shows an apparatus for heating a coal sample by applying a constant load to the coal sample and a material having through holes on the upper and lower surfaces.
  • the lower part of the container 3 is filled with coal to form a sample 1, and a material 2 having through holes on the upper and lower surfaces is arranged on the sample 1.
  • the sample 1 is heated to the softening and melting start temperature or higher, the sample is infiltrated into the material 2 having through holes on the upper and lower surfaces, and the infiltration distance is measured. Heating is performed in an inert gas atmosphere.
  • the inert gas refers to a gas that does not react with coal in the measurement temperature range
  • representative gases include argon gas, helium gas, nitrogen gas, and the like.
  • the penetration distance may be measured by heating the material having coal and the through-holes while maintaining a constant volume.
  • An example of a measuring device for softening and melting characteristics (penetration distance) used in that case is shown in FIG.
  • an expansion coefficient detecting rod 13 is arranged on the upper surface of a material 2 having through holes on the upper and lower surfaces, a weight 14 for applying a load is placed on the upper end of the expansion coefficient detecting rod 13, and a displacement meter 15 is placed thereon. And measure the expansion rate.
  • a displacement meter 15 that can measure the expansion range ( ⁇ 100% to 300%) of the expansion coefficient of the sample may be used. Since it is necessary to maintain the inside of the heating system in an inert gas atmosphere, a non-contact type displacement meter is suitable, and it is desirable to use an optical displacement meter.
  • the inert gas atmosphere is preferably a nitrogen atmosphere.
  • the expansion coefficient detecting rod 13 may be buried in the particle packed layer, and therefore the material 2 having the through holes on the upper and lower surfaces and the expansion coefficient detecting rod 13. It is desirable to take measures to sandwich the board between the two.
  • the load to be applied is preferably uniformly applied to the upper surface of the material having through holes on the upper and lower surfaces arranged on the upper surface of the sample, and 5 to 80 kPa with respect to the area of the upper surface of the material having the through holes on the upper and lower surfaces, It is desirable to apply a pressure of preferably 15 to 55 kPa, most preferably 25 to 50 kPa.
  • This pressure is preferably set based on the expansion pressure of the softened and molten layer in the coke oven, but as a result of examining the reproducibility of the measurement results and the ability to detect the difference in brands in various coals, It has been found that a slightly higher value of about 25 to 50 kPa is most preferable as a measurement condition.
  • a heating means that can be heated at a predetermined rate of temperature while measuring the temperature of the sample.
  • a heating means that can be heated at a predetermined rate of temperature while measuring the temperature of the sample.
  • an electric furnace an external heating type that combines a conductive container and high frequency induction, or an internal heating type such as a microwave.
  • the internal heating method it is necessary to devise a method for making the temperature in the sample uniform, and for example, it is preferable to take measures to increase the heat insulation of the container.
  • the heating rate needs to match the heating rate of the coal in the coke oven for the purpose of simulating the softening and melting behavior of the coal and caking material in the coke oven.
  • the heating rate of coal in the softening and melting temperature range in the coke oven varies depending on the position in the furnace and operating conditions, it should be approximately 2 to 10 ° C / min, and the average heating rate should be 2 to 4 ° C / min. The most desirable is about 3 ° C./min.
  • the permeation distance and expansion are small at 3 ° C./min, which may make detection difficult.
  • a predetermined heating rate in the range of 0 ° C (room temperature) to 550 ° C, preferably in the range of 300 to 550 ° C, which is the softening and melting temperature of coal. You can heat with.
  • the material having the through holes on the upper and lower surfaces can measure or calculate the transmission coefficient in advance.
  • Examples of the form of the material include an integrated material having a through hole and a particle packed layer.
  • Examples of the integrated material having a through hole include a material having a circular through hole 16 as shown in FIG. 2, a material having a rectangular through hole, and a material having an indeterminate shape.
  • the particle packed layer is roughly divided into a spherical particle packed layer and a non-spherical particle packed layer.
  • the spherical particle packed layer is composed of beads packed particles 17 as shown in FIG. 3, and the non-spherical particle packed layer is not suitable. Examples thereof include regular particles and those made of filled cylinders 18 as shown in FIG.
  • the transmission coefficient in the material is as uniform as possible and that the calculation of the transmission coefficient is easy in order to simplify the measurement. Therefore, the use of a spherical particle packed bed is particularly desirable for the material having through holes on the upper and lower surfaces used in the present invention.
  • the material having the through holes on the upper and lower surfaces is not particularly specified as long as the shape hardly changes to the coal softening and melting temperature range, specifically up to 600 ° C., and does not react with coal. Further, the height may be high enough to allow the coal melt to permeate, and may be about 20 to 100 mm when heating a coal layer having a thickness of 5 to 20 mm.
  • the transmission coefficient of the material having through holes on the upper and lower surfaces needs to be set by estimating the transmission coefficient of coarse defects present in the coke layer.
  • the transmission coefficient is 1 ⁇ 10 8 to 2 ⁇ 10 9 m ⁇ 2 as a result of repeated studies by the present inventors, such as consideration of coarse defect constituent factors and estimation of the size, which are particularly desirable for the present invention. Was found to be optimal.
  • This transmission coefficient is derived based on the Darcy law expressed by the following equation (1).
  • ⁇ P the pressure loss [Pa] in the material having through holes on the upper and lower surfaces
  • L the height [m] of the material having the through holes
  • K the transmission coefficient [m ⁇ 2 ]
  • ⁇ the fluid.
  • u fluid velocity [m / s].
  • glass beads having a diameter of about 0.2 mm to 3.5 mm are used. It is desirable to choose, most preferably 2 mm.
  • the coal and binder used as the measurement sample are pulverized in advance and filled to a predetermined layer thickness with a predetermined packing density.
  • the pulverized particle size may be the particle size of the coal charged in the coke oven (the ratio of particles having a particle size of 3 mm or less is about 70 to 80% by mass), and pulverization so that the particle size of 3 mm or less is 70% by mass or more.
  • the density for filling the pulverized product can be 0.7 to 0.9 g / cm 3 in accordance with the packing density in the coke oven, but as a result of studying reproducibility and detection power, 0.8 g / cm 3 is preferable. I found out.
  • the layer thickness to be filled can be 5 to 20 mm based on the thickness of the softened and melted layer in the coke oven. As a result of studying reproducibility and detection power, the layer thickness should be 10 mm. I found it preferable.
  • Coal or caking material is pulverized so that the particle size of 2 mm or less is 100% by mass, and the pulverized coal or caking material has a packing density of 0.8 g / cm 3 and a layer thickness of 10 mm.
  • Create a sample by filling the container like (2) A glass bead having a diameter of 2 mm is arranged on the sample so as to have a layer thickness of an infiltration distance or more, (3) Heating in an inert gas atmosphere from room temperature to 550 ° C. at a heating rate of 3 ° C./min while applying a load from the top of the glass beads to 50 kPa, (4) The penetration distance of the molten sample that has penetrated into the glass bead layer is measured.
  • the penetration distance of the softened melt of coal and binder can be measured continuously during heating.
  • continuous measurement is difficult due to the influence of tar generated from the sample.
  • the expansion and infiltration phenomenon of coal by heating is irreversible, and once expanded and infiltrated, the shape is maintained even after cooling, so after the coal melt has been infiltrated, the entire container is cooled, You may make it measure how much it penetrate
  • the softened melt that has permeated the interparticle voids fixes the entire particle layer up to the permeated portion. Therefore, if the relationship between the mass and height of the particle packed bed is obtained in advance, the mass of the non-adhered particles is measured after the infiltration, and the mass of the adhering particles is derived by subtracting from the initial mass. And the penetration distance can be calculated therefrom.
  • the inventors examined how much the penetration distance has an adverse effect on coke strength, and obtained the following criteria. That is, when the brand of the coal contained in the blended coal can be determined in advance, the penetration distance is 1. with respect to the average penetration distance of the brand of coal having a maximum Gieseler flow rate of 100 ddpm or more and 500 ddpm or less contained in the blended coal. Coal that is 6 times or more tends to leave coarse defects in coke, so it is desirable not to add as much as possible to the blended coal. At this time, the average permeation distance is preferably obtained by weighted averaging according to each blending ratio, but may be a simple average.
  • standard of the penetration distance is determined on the basis of another coal because the value changes with the measurement conditions of the penetration distance.
  • the relative magnitude relationship between the penetration distances between coals is almost the same regardless of the measurement method, such a standard can be established.
  • the permeation distance is less than that standard, and the flow rate is relatively high at 1000 ddpm or more in the fluidity evaluation using a Gieseler plastometer.
  • the coal showing the property has a total blending ratio of 10 mass% to 100 mass%. Since such a coal does not easily leave coarse defects in coke, an effect of improving fluidity can be obtained by adding it to the blended coal. In such a coal, there is no problem even if the blending ratio is high, and the blending ratio may be 100 mass%, but coal with high Gieseller fluidity is relatively expensive and has a relatively low carbonization degree.
  • the blending ratio is more preferably 10 to 70 mass%.
  • the calculation of the permeation distance at the maximum Gieseller fluidity of 200 ddpm is based on the fact that the lower limit value of the maximum Gieseller fluidity of the coal blend from which suitable coke is obtained is about 200 ddpm.
  • coal that has a relatively high fluidity of 1000 ddpm or more in the fluidity evaluation by a Gisela plastometer, and coal that exceeds the same reference value as the previous paragraph will leave coarse defects in the coke, so it will remain in the blended coal. It is desirable not to add as much as possible, the total blending ratio of the coal is desirably 10 mass% or less, and it is not necessary to add at all.
  • the reference value of the penetration distance can be determined as follows. That is, a linear regression equation that passes through the origin is obtained based on the logarithm value of the maximum Gieseller fluidity of one or more coals having a maximum Gieseller fluidity of 30 ddpm or more and 1000 ddpm or less and the measured value of the penetration distance.
  • This is a method of calculating the penetration distance in the case of the Gieseler flow rate that is the target of charcoal and using 1.6 times the penetration distance as a reference value.
  • the target for the maximum flow rate of the coal blender is 200 to 500 ddpm, and the higher the required maximum flow rate target value, the larger the average penetration distance. It is this method to set to.
  • the effect of improving the fluidity can be obtained by adding it to the blended coal, and the total blending ratio of such coal is preferably 10 mass% or more and 100 mass% or less.
  • Coal used for blended coal is usually used by measuring various grades for each brand in advance. Similarly, the penetration distance may be measured in advance for each brand lot. The average penetration distance of the blended coal is measured in advance for each brand, and the value may be averaged according to the blending ratio, or the blended coal may be measured to measure the penetration distance. .
  • the blended coal used for coke production may contain caking additive, oils, powdered coke, petroleum coke, resins, waste, etc. in addition to coal.
  • the value of the infiltration distance varies depending on the shape of the apparatus to be measured and the measurement conditions, in the case of using the measurement method shown in the examples, in the case of a normal blended coal, the Gieseler maximum fluidity contained in the blended coal is 100 ddpm or more and 500 ddpm or less.
  • the average penetration distance of coal is about 7.0 to 9.5 mm. Therefore, the reference value of the penetration distance is 1.6 times the average penetration distance, that is, a value of about 11.2 to 15.2 mm. Therefore, if a permeation distance of 15 mm is used as a simple standard, it is possible to almost certainly select a brand having an adverse effect on the coke strength and limit the blending ratio of such coal.
  • the penetration distance was measured using the apparatus shown in FIG. Since the heating method was a high frequency induction heating type, the heating element 8 in FIG. 1 was an induction heating coil, and the material of the container 3 was graphite, which is a dielectric.
  • the diameter of the container was 18 mm, the height was 37 mm, and glass beads with a diameter of 2 mm were used as materials having through holes on the upper and lower surfaces.
  • the sample 1 was filled by loading 2.04 g of a coal sample pulverized to a particle size of 2 mm or less and vacuum-dried at room temperature into the container 3 and dropping a weight of 200 g from the top of the coal sample 5 times at a fall distance of 20 mm. (In this state, the sample layer thickness was 10 mm).
  • glass beads having a diameter of 2 mm were placed on the packed layer of Sample 1 so as to have a thickness of 25 mm.
  • a sillimanite disk having a diameter of 17 mm and a thickness of 5 mm is placed on the glass bead packed layer, a quartz rod is placed thereon as the expansion coefficient detecting rod 13, and a weight of 1.3 kg is placed on the quartz rod. placed. Thereby, the pressure applied on the sillimanite disk becomes 50 kPa.
  • Nitrogen gas was used as the inert gas, and the mixture was heated to 550 ° C. at a heating rate of 3 ° C./min. After the heating, cooling was performed in a nitrogen atmosphere, and the mass of beads not fixed to the softened and melted coal was measured from the cooled container.
  • the penetration distance was the filling height of the fixed bead layer.
  • the relationship between the filling height and the mass of the glass bead packed bed was obtained in advance, and the glass bead filling height could be derived from the mass of the beads to which the softened and melted coal was fixed.
  • the result was equation (2), and the penetration distance was derived from equation (2).
  • L (GM) ⁇ H (2)
  • L is the penetration distance [mm]
  • G is the mass of the filled glass beads [g]
  • M is the mass of the beads not fixed to the softened melt [g]
  • H is the glass beads filled in this experimental apparatus. It represents the height of the packed bed per gram [mm / g].
  • FIG. 5 shows the relationship between the measurement results of the penetration distance and the logarithmic value (logMF) of the maximum fluidity (Maximum Fluidity: MF).
  • logMF logarithmic value of the maximum fluidity
  • coke strength is mainly determined by the coal's vitrinite average maximum reflectance (Ro) and logarithmic value (log MF) of the Gieseler maximum fluidity (MF).
  • Ro vitrinite average maximum reflectance
  • MF Gieseler maximum fluidity
  • Table 2 shows the composition. Filled in a dry distillation can so that the bulk density of 750 (kg / m 3 ) is 16 kg of blended coal adjusted to a particle size of 3 mm or less, 100 mass% and moisture of 8 mass%, and dry-distilled in an electric furnace at a furnace wall temperature of 1050 ° C for 6 hours.
  • drum strength DI 150/6
  • Coal coal L containing coal B, E, and G ⁇ I has high fluidity (maximum fluidity MF measured by the Gisela plastometer method is 1000 ddpm or more).
  • ⁇ Q is prepared and the strength of coke obtained by dry distillation under the same conditions is shown in Table 2 (D and F coals are added to the blended coal in the outer frame, so the total blending ratio is 100 mass. %).
  • the average penetration distance of coals with the highest Gieseller fluidity in the blended coal of 100 ddpm or more and 500 ddpm or less is about 7.9 mm, and the penetration distance of D coal is 2.4 times the penetration distance. The distance is extremely large. On the other hand, the penetration distance of F charcoal is 1.5 times.
  • Table 2 and FIG. 6 show the results of measuring the rotational strength index DI (150/6) for coke produced by dry distillation of blended coals K to Q under the same conditions.
  • the strength can be improved by adding 10 mass% or more of coal (for example, coal such as F coal) having a maximum maximum fluidity MF measured with a Gieseler plastometer and a small permeation distance with respect to the blended coal. If the strength is constant, relatively expensive coal can be reduced. On the other hand, when blending a large amount of coal (for example, coal such as D coal) having a maximum maximum fluidity MF measured with a Gieseler plastometer and an extremely long penetration distance, the strength decreases. If this is to be maintained at a constant level, relatively expensive coal must be added separately, resulting in increased costs. Even if the coal has such a long permeation distance with respect to the blended coal, if the amount used is within a proper range of 10 mass% or less, the strength is hardly lowered, so that the cost is not increased.
  • coal for example, coal such as F coal
  • the reference value of the permeation distance for distinguishing coal that causes such an adverse effect can be determined by a method different from the above.
  • a linear regression equation passing through the origin is obtained based on the logarithm value of the maximum Guiesar fluidity of one or more coals with a Gieseler maximum fluidity of 30 ddpm or more and 1000 ddpm or less and the measured permeation distance.
  • the permeation distance when the fluidity is 200 ddpm is calculated and 1.6 times the permeation distance is determined as a reference.
  • the log MF value of the target blended coal is about 2.6 to 2.7. Therefore, the penetration distance estimated from the MF value is about 1.6 times as large as about 8.7 to 9.0 mm. That is, 13.9 to 14.4 mm can be set as the reference value.
  • the reason why 1.6 times the estimated penetration distance is used as the judgment criterion for coal is to reliably select coal such as F coal that has a favorable influence on coke strength. According to the knowledge of the inventors, it is known that coal having a relatively high MF is more preferable as the permeation distance is smaller. Therefore, by making the criterion value smaller, a more preferable blending amount of coal can be ensured. Increasing the amount of coal that can be undesirable is more reliable.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Organic Chemistry (AREA)
  • Coke Industry (AREA)
PCT/JP2011/070315 2010-09-01 2011-08-31 冶金用コークスの製造方法 WO2012029984A1 (ja)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CN201180051087.XA CN103180413B (zh) 2010-09-01 2011-08-31 冶金用焦炭的制造方法
KR1020137007936A KR101441263B1 (ko) 2010-09-01 2011-08-31 야금용 코크스의 제조 방법

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP2010-195621 2010-09-01
JP2010-195616 2010-09-01
JP2010195621 2010-09-01
JP2010195616 2010-09-01

Publications (1)

Publication Number Publication Date
WO2012029984A1 true WO2012029984A1 (ja) 2012-03-08

Family

ID=45773052

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2011/070315 WO2012029984A1 (ja) 2010-09-01 2011-08-31 冶金用コークスの製造方法

Country Status (4)

Country Link
JP (1) JP5067495B2 (zh)
KR (1) KR101441263B1 (zh)
CN (1) CN103180413B (zh)
WO (1) WO2012029984A1 (zh)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2015086301A (ja) * 2013-10-31 2015-05-07 Ｊｆｅスチール株式会社 コークスの製造方法
JP2015193829A (ja) * 2014-03-28 2015-11-05 Ｊｆｅスチール株式会社 コークスの製造方法

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102017209782A1 (de) * 2017-06-09 2018-12-13 Evonik Degussa Gmbh Verfahren zur Wärmedämmung eines evakuierbaren Behälters
CN114369471B (zh) * 2021-12-27 2022-11-01 乌海市华信煤焦化有限公司 一种利用瘦煤提高焦炭强度的室式炼焦方法

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003129064A (ja) * 2001-10-19 2003-05-08 Sumitomo Metal Ind Ltd 品質を均一化したコークスの製造方法
JP2007262296A (ja) * 2006-03-29 2007-10-11 Jfe Steel Kk 冶金用コークスの製造方法
JP2010043196A (ja) * 2008-08-13 2010-02-25 Jfe Steel Corp 高強度コークスの製造方法
JP2010190761A (ja) * 2009-02-19 2010-09-02 Jfe Steel Corp 石炭の軟化溶融特性評価方法

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA2304744C (en) * 1998-07-29 2008-04-29 Kawasaki Steel Corporation Method of producing coke for metallurgy

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003129064A (ja) * 2001-10-19 2003-05-08 Sumitomo Metal Ind Ltd 品質を均一化したコークスの製造方法
JP2007262296A (ja) * 2006-03-29 2007-10-11 Jfe Steel Kk 冶金用コークスの製造方法
JP2010043196A (ja) * 2008-08-13 2010-02-25 Jfe Steel Corp 高強度コークスの製造方法
JP2010190761A (ja) * 2009-02-19 2010-09-02 Jfe Steel Corp 石炭の軟化溶融特性評価方法

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2015086301A (ja) * 2013-10-31 2015-05-07 Ｊｆｅスチール株式会社 コークスの製造方法
JP2015193829A (ja) * 2014-03-28 2015-11-05 Ｊｆｅスチール株式会社 コークスの製造方法

Also Published As

Publication number Publication date
KR20130063016A (ko) 2013-06-13
KR101441263B1 (ko) 2014-09-17
CN103180413B (zh) 2014-08-20
JP2012072387A (ja) 2012-04-12
JP5067495B2 (ja) 2012-11-07
CN103180413A (zh) 2013-06-26

Similar Documents

Publication Publication Date Title
JP5229362B2 (ja) 冶金用コークスの製造方法
WO2012029985A1 (ja) 石炭及び粘結材の軟化溶融特性評価方法およびコークスの製造方法
JP5071578B2 (ja) コークス製造用石炭の調製方法
JP5152378B2 (ja) 冶金用コークスの製造方法
JP6056157B2 (ja) コークス用配合炭組成決定方法及びコークス製造方法
JP2010190761A (ja) 石炭の軟化溶融特性評価方法
JP5201250B2 (ja) 冶金用コークスの製造方法および冶金用コークス製造用粘結材
JP5578293B2 (ja) コークス製造用石炭の調製方法
JP5062378B1 (ja) コークスの製造方法
JP5067495B2 (ja) 冶金用コークスの製造方法
TWI457555B (zh) Evaluation method of softening and melting of coal and binder and method for manufacturing coke

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 11821994

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

ENP Entry into the national phase

Ref document number: 20137007936

Country of ref document: KR

Kind code of ref document: A

122 Ep: pct application non-entry in european phase

Ref document number: 11821994

Country of ref document: EP

Kind code of ref document: A1