JP2020197453A - Method for estimating nitrogen concentration in coke and method of producing coke - Google Patents
Method for estimating nitrogen concentration in coke and method of producing coke Download PDFInfo
- Publication number
- JP2020197453A JP2020197453A JP2019103806A JP2019103806A JP2020197453A JP 2020197453 A JP2020197453 A JP 2020197453A JP 2019103806 A JP2019103806 A JP 2019103806A JP 2019103806 A JP2019103806 A JP 2019103806A JP 2020197453 A JP2020197453 A JP 2020197453A
- Authority
- JP
- Japan
- Prior art keywords
- coke
- nitrogen concentration
- coal
- coking coal
- concentration
- Prior art date
- Legal status (The legal status 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 status listed.)
- Granted
Links
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 title claims abstract description 306
- 229910052757 nitrogen Inorganic materials 0.000 title claims abstract description 153
- 239000000571 coke Substances 0.000 title claims abstract description 110
- 238000000034 method Methods 0.000 title claims abstract description 30
- 239000003245 coal Substances 0.000 claims abstract description 165
- 238000004519 manufacturing process Methods 0.000 claims abstract description 4
- 238000004939 coking Methods 0.000 claims description 99
- 238000002156 mixing Methods 0.000 claims description 3
- 239000002994 raw material Substances 0.000 abstract description 4
- 150000001875 compounds Chemical class 0.000 description 12
- 238000013329 compounding Methods 0.000 description 8
- 238000012935 Averaging Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 239000003575 carbonaceous material Substances 0.000 description 2
- 238000010304 firing Methods 0.000 description 2
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 1
- 235000011941 Tilia x europaea Nutrition 0.000 description 1
- RHZUVFJBSILHOK-UHFFFAOYSA-N anthracen-1-ylmethanolate Chemical compound C1=CC=C2C=C3C(C[O-])=CC=CC3=CC2=C1 RHZUVFJBSILHOK-UHFFFAOYSA-N 0.000 description 1
- 239000003830 anthracite Substances 0.000 description 1
- 238000003763 carbonization Methods 0.000 description 1
- 239000003610 charcoal Substances 0.000 description 1
- 239000000701 coagulant Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000004571 lime Substances 0.000 description 1
Landscapes
- Coke Industry (AREA)
Abstract
Description
本発明は、コークスに含まれる窒素濃度を推定する方法と、この推定方法に基づいて調整された原料炭に基づいてコークスを製造する方法に関する。 The present invention relates to a method of estimating the nitrogen concentration contained in coke and a method of producing coke based on coking coal adjusted based on this estimation method.
特許文献１では、石灰系原料由来のＣａを３６質量％以上含有する被覆物を炭材表面に被覆した表面被覆炭材を、焼結燃料として配合炭中に含めることにより、焼結鉱の製造時におけるＮＯｘの発生を抑制するようにしている。 In Patent Document 1, a sintered ore is produced by including a surface-coated coal material having a coating material containing 36% by mass or more of Ca derived from a lime-based raw material on the surface of the coal material as a sintered fuel in the blended coal. The generation of NOx at the time is suppressed.
ＮＯｘの発生原因はコークスに含まれる窒素になるが、特許文献１では、コークス中の窒素濃度については何ら着目していない。そこで、本発明は、コークス中の窒素濃度を推定することを目的とする。 The cause of NOx generation is nitrogen contained in coke, but Patent Document 1 does not pay any attention to the nitrogen concentration in coke. Therefore, an object of the present invention is to estimate the nitrogen concentration in coke.
本発明は、コークスに含まれる窒素濃度を推定する方法である。まず、コークスの製造に用いられる原料炭について、少なくとも原料炭中の窒素濃度を含むパラメータを測定する。そして、パラメータ及びコークス中の窒素濃度の相関関係と、測定したパラメータとに基づいて、原料炭から製造されるコークス中の窒素濃度を算出（推定）する。 The present invention is a method for estimating the nitrogen concentration contained in coke. First, for the coking coal used in the production of coke, parameters including at least the nitrogen concentration in the coking coal are measured. Then, the nitrogen concentration in coke produced from coking coal is calculated (estimated) based on the correlation between the parameters and the nitrogen concentration in coke and the measured parameters.
パラメータとしては、原料炭中の窒素濃度とすることができる。そして、下記式（Ｉ）に基づいて、コークス中の窒素濃度を算出することができる。 The parameter can be the nitrogen concentration in the coking coal. Then, the nitrogen concentration in coke can be calculated based on the following formula (I).
上記式（Ｉ）において、ＣＮ１はコークス中の窒素濃度［質量％］であり、ＣＮ２は原料炭中の窒素濃度［質量％］であり、ａ１及びａ２は定数［−］である。 In the above formula (I), CN 1 is the nitrogen concentration [mass%] in coke, CN 2 is the nitrogen concentration [mass%] in coking coal, and a1 and a2 are constants [−].
パラメータとしては、原料炭中の窒素濃度、原料炭の最高流動度及び原料炭中のＭｇＯ濃度とすることができる。そして、下記式（ＩＩ）に基づいて、コークス中の窒素濃度を算出することができる。 The parameters can be the nitrogen concentration in the coking coal, the maximum fluidity of the coking coal, and the MgO concentration in the coking coal. Then, the nitrogen concentration in coke can be calculated based on the following formula (II).
上記式（ＩＩ）において、ＣＮ１はコークス中の窒素濃度［質量％］であり、ＣＮ２は原料炭中の窒素濃度［質量％］であり、ＭＦは原料炭の最高流動度［−］であり、ＭｇＯは原料炭中のＭｇＯ濃度［質量％］であり、ｄ１，ｄ２，ｄ３及びｄ４は定数［−］である。 In the above formula (II), CN 1 is the nitrogen concentration [mass%] in coke, CN 2 is the nitrogen concentration [mass%] in the coking coal, and MF is the maximum fluidity [-] of the coking coal. Yes, MgO is the MgO concentration [mass%] in the coking coal, and d1, d2, d3 and d4 are constants [−].
原料炭が配合炭であるとき、パラメータとしては、配合炭に含まれる各単味炭の配合比率に基づいて、各単味炭のパラメータを加重平均した値とすることができる。 When the coking coal is a compound coal, the parameter can be a weighted average value of the parameters of each simple coal based on the compounding ratio of each simple coal contained in the compound coal.
本発明の推定方法によって推定したコークス中の窒素濃度が目標値となるように原料炭を調整し、調整した原料炭を乾留してコークスを製造することができる。 The coking coal can be adjusted so that the nitrogen concentration in the coke estimated by the estimation method of the present invention becomes a target value, and the adjusted coking coal can be carbonized to produce coke.
本発明によれば、コークスに含まれる窒素濃度を推定することができる。 According to the present invention, the nitrogen concentration contained in coke can be estimated.
本発明者は、コークス中の窒素濃度が、コークス炉に装入される原料炭中の窒素濃度に依存したり、原料炭中の窒素濃度、原料炭の最高流動度ＭＦ及び原料炭中のＭｇＯ濃度に依存したりすることを見出した。これにより、原料炭中の窒素濃度に基づいて、又は原料炭における窒素濃度、最高流動度ＭＦ及びＭｇＯ濃度に基づいて、コークス中の窒素濃度を推定できることが分かった。以下、コークス中の窒素濃度を推定する方法（推定方法１，２）について説明する。 According to the present inventor, the nitrogen concentration in coke depends on the nitrogen concentration in the coking coal charged into the coke oven, the nitrogen concentration in the coking coal, the maximum fluidity MF of the coking coal, and MgO in the coking coal. We found that it depends on the concentration. From this, it was found that the nitrogen concentration in coke can be estimated based on the nitrogen concentration in the coking coal or based on the nitrogen concentration in the coking coal, the maximum fluidity MF and the MgO concentration. Hereinafter, a method for estimating the nitrogen concentration in coke (estimation methods 1 and 2) will be described.
（推定方法１）
コークス中の窒素濃度と原料炭中の窒素濃度との間には、ある程度の相関があることが分かった。図１には、原料炭中の窒素濃度（実測値）［質量％］と、この原料炭から製造されたコークス中の窒素濃度（実測値）［質量％］との関係を示す。図１において、決定係数Ｒ２は０．３９４８であった。図１から分かるように、原料炭中の窒素濃度が高いほど、コークス中の窒素濃度が高くなる傾向がある。言い換えれば、原料炭中の窒素濃度が低いほど、コークス中の窒素濃度が低くなる傾向がある。
(Estimation method 1)
It was found that there is some correlation between the nitrogen concentration in coke and the nitrogen concentration in coking coal. FIG. 1 shows the relationship between the nitrogen concentration (measured value) [mass%] in the coking coal and the nitrogen concentration (measured value) [mass%] in the coke produced from this coking coal. In FIG. 1, the coefficient of determination R 2 was 0.3948. As can be seen from FIG. 1, the higher the nitrogen concentration in the coking coal, the higher the nitrogen concentration in the coke tends to be. In other words, the lower the nitrogen concentration in coking coal, the lower the nitrogen concentration in coke tends to be.
したがって、コークス中の窒素濃度は、下記式（１）に基づいて算出（推定）される。 Therefore, the nitrogen concentration in coke is calculated (estimated) based on the following formula (1).
上記式（１）において、ＣＮ１はコークス中の窒素濃度［質量％］であり、ＣＮ２は原料炭中の窒素濃度［質量％］であり、ａ１及びａ２は定数［−］である。図１に示す測定結果によれば、定数ａ１が０．２１１であり、定数ａ２が０．５４７である。 In the above formula (1), CN 1 is the nitrogen concentration [mass%] in coke, CN 2 is the nitrogen concentration [mass%] in coking coal, and a1 and a2 are constants [−]. According to the measurement results shown in FIG. 1, the constant a1 is 0.211 and the constant a2 is 0.547.
原料炭中の窒素濃度ＣＮ２は、ＪＩＳ Ｍ８８１３の規定に基づいて測定することができる。ここで、原料炭が配合炭であるとき、配合炭に含まれる各単味炭の窒素濃度を測定し、各単味炭の配合比率［質量％］に基づいて、各単味炭の窒素濃度を加重平均することにより、原料炭（配合炭）の窒素濃度ＣＮ２を算出することができる。 The nitrogen concentration CN 2 in the coking coal can be measured based on the regulations of JIS M8813. Here, when the coking coal is a compound coal, the nitrogen concentration of each simple coal contained in the compound coal is measured, and the nitrogen concentration of each simple coal is measured based on the compounding ratio [mass%] of each simple coal. The nitrogen concentration CN 2 of the coking coal (combined coal) can be calculated by weighted averaging.
上記式（１）によってコークス中の窒素濃度ＣＮ１を推定すれば、この推定結果に基づいて、原料炭中の窒素濃度ＣＮ２を調整して、コークス中の窒素濃度ＣＮ１を調整することができる。具体的には、コークスを製造するとき、推定したコークス中の窒素濃度ＣＮ１が目標値となるように、所望の窒素濃度ＣＮ２を有する原料炭を用いることができる。この原料炭を乾留してコークスを製造すれば、このコークス中の窒素濃度を目標値とすることができる。 If the nitrogen concentration CN 1 in coke is estimated by the above formula (1), the nitrogen concentration CN 2 in coking coal can be adjusted to adjust the nitrogen concentration CN 1 in coke based on this estimation result. it can. Specifically, when coke is produced, coking coal having a desired nitrogen concentration CN 2 can be used so that the estimated nitrogen concentration CN 1 in the coke becomes a target value. If this coking coal is carbonized to produce coke, the nitrogen concentration in the coke can be set as a target value.
一方、例えば、コークス中の窒素濃度ＣＮ１を低減する必要があるときには、原料炭中の窒素濃度ＣＮ２を測定して、上記式（１）に基づいてコークス中の窒素濃度ＣＮ１を推定し、推定した窒素濃度ＣＮ１が低くなるように、原料炭を調整することができる。ここで、原料炭が単味炭であるときには、推定した窒素濃度ＣＮ１が低くなるように、単味炭の種類（銘柄）を変更することができる。また、原料炭が配合炭であるときには、推定した窒素濃度ＣＮ１が低くなるように、単味炭の種類（銘柄）を変更したり、各単味炭の配合比率を変更したりすることができる。 On the other hand, for example, when it is necessary to reduce the nitrogen concentration CN 1 in coke, the nitrogen concentration CN 2 in coking coal is measured, and the nitrogen concentration CN 1 in coke is estimated based on the above formula (1). The coking coal can be adjusted so that the estimated nitrogen concentration CN 1 is low. Here, when the coking coal is a simple coal, the type (brand) of the simple coal can be changed so that the estimated nitrogen concentration CN 1 is low. In addition, when the coking coal is a compound coal, the type (brand) of the simple coal or the compounding ratio of each simple coal may be changed so that the estimated nitrogen concentration CN 1 is low. it can.
コークス中の窒素濃度ＣＮ１を低減する必要がある場合としては、例えば、焼結鉱を製造するための凝結材として、通常コークスに対して、窒素の含有量が少ない無煙炭やＮＯｘの発生量が少ない表面被覆炭材（特許文献１等に記載の表面被覆炭材）を組み合わせて使用する場合において、通常コークスの使用量を増やしたい場合が挙げられる。通常コークスの使用量を増やそうとすると、この使用量の増加によってＮＯｘの発生量が増加してしまうが、通常コークス中の窒素濃度ＣＮ１を低減することにより、ＮＯｘの発生量の増加を抑制することができる。 When it is necessary to reduce the nitrogen concentration CN 1 in coke, for example, as a coagulant for producing sinter, the amount of anthracite or NOx generated, which usually has a lower nitrogen content than coke, is high. When a small amount of surface-coated carbonaceous material (surface-coated carbonaceous material described in Patent Document 1 and the like) is used in combination, there is a case where it is usually desired to increase the amount of coke used. If an attempt is made to increase the amount of normal coke used, the amount of NOx generated will increase due to this increase in the amount used, but by reducing the nitrogen concentration CN 1 in normal coke, the increase in the amount of NOx generated will be suppressed. be able to.
次に、推定方法１によるコークス中の窒素濃度ＣＮ１の推定精度を確認した。 Next, the estimation accuracy of the nitrogen concentration CN 1 in coke by the estimation method 1 was confirmed.
まず、複数種類の原料炭を用意し、各原料炭を乾留してコークスを製造した。そして、製造されたコークス中の窒素濃度を測定した。一方、各原料炭の窒素濃度ＣＮ２を測定し、測定した窒素濃度ＣＮ２を上記式（１）に代入することにより、コークス中の窒素濃度ＣＮ１を推定した。 First, a plurality of types of coking coal were prepared, and each coking coal was carbonized to produce coke. Then, the nitrogen concentration in the produced coke was measured. On the other hand, the nitrogen concentration CN 2 of each coking coal was measured, and the measured nitrogen concentration CN 2 was substituted into the above formula (1) to estimate the nitrogen concentration CN 1 in coke.
図２には、上記式（１）に基づいて推定されたコークス中の窒素濃度（推定値）と、測定したコークス中の窒素濃度（実測値）との関係を示す。図２において、決定係数Ｒ２は０．３９４８であった。図２に示すように、推定方法１によれば、原料炭中の窒素濃度ＣＮ２に基づいて、この原料炭から製造されたコークス中の窒素濃度ＣＮ１を大まかに把握することができる。 FIG. 2 shows the relationship between the nitrogen concentration in coke (estimated value) estimated based on the above formula (1) and the measured nitrogen concentration in coke (measured value). In FIG. 2, the coefficient of determination R 2 was 0.3948. As shown in FIG. 2, according to the estimation method 1, the nitrogen concentration CN 1 in the coke produced from this coking coal can be roughly grasped based on the nitrogen concentration CN 2 in the coking coal.
（推定方法２）
上述した推定方法１によれば、コークス中の窒素濃度ＣＮ１は、原料炭中の窒素濃度ＣＮ２により推定することができる。また、原料炭中の窒素濃度ＣＮ２、原料炭の最高流動度ＭＦ及び原料炭中のＭｇＯ濃度のすべてを考慮することで、コークス中の窒素濃度ＣＮ１を推定できることが判った。
(Estimation method 2)
According to the estimation method 1 described above, the nitrogen concentration CN 1 in coke can be estimated from the nitrogen concentration CN 2 in the coking coal. It was also found that the nitrogen concentration CN 1 in coke can be estimated by considering all of the nitrogen concentration CN 2 in the coking coal, the maximum fluidity MF of the coking coal and the MgO concentration in the coking coal.
推定方法２によれば、コークス中の窒素濃度は下記式（２）に基づいて算出（推定）される。 According to the estimation method 2, the nitrogen concentration in coke is calculated (estimated) based on the following equation (2).
上記式（２）において、ＣＮ１はコークス中の窒素濃度［質量％］であり、ＣＮ２は原料炭中の窒素濃度［質量％］であり、ＭＦは原料炭の最高流動度［−］であり、ＭｇＯは原料炭中のＭｇＯ濃度［質量％］である。 In the above formula (2), CN 1 is the nitrogen concentration [mass%] in coke, CN 2 is the nitrogen concentration [mass%] in the coking coal, and MF is the maximum fluidity [-] of the coking coal. Yes, MgO is the MgO concentration [mass%] in the coking coal.
原料炭における窒素濃度ＣＮ２の測定方法は、上述したとおりである。 The method for measuring the nitrogen concentration CN 2 in the coking coal is as described above.
また、原料炭の最高流動度ＭＦは、ＪＩＳ Ｍ８８０１で規定されているギーセラープラストメータ測定法によって測定することができる。ここで、原料炭が配合炭であるとき、配合炭に含まれる各単味炭の最高流動度ＭＦを測定し、各単味炭の配合比率［質量％］に基づいて、各単味炭の最高流動度ＭＦを加重平均することにより、原料炭（配合炭）の最高流動度ＭＦを算出することができる。 Further, the maximum fluidity MF of the coking coal can be measured by the giesel plastometer measuring method specified in JIS M8801. Here, when the coking coal is a compound coal, the maximum fluidity MF of each simple coal contained in the compound coal is measured, and based on the compounding ratio [mass%] of each simple coal, each simple coal The maximum fluidity MF of the coking coal (blended coal) can be calculated by weighted averaging the maximum fluidity MF.
さらに、原料炭中のＭｇＯ濃度は、ＪＩＳ Ｍ８８１５の規定に基づいて測定することができる。ここで、原料炭が配合炭であるとき、配合炭に含まれる各単味炭のＭｇＯ濃度を測定し、各単味炭の配合比率［質量％］に基づいて、各単味炭のＭｇＯ濃度を加重平均することにより、原料炭（配合炭）のＭｇＯ濃度を算出することができる。 Further, the MgO concentration in the coking coal can be measured based on the regulations of JIS M8815. Here, when the coking coal is a compound coal, the MgO concentration of each simple coal contained in the compound coal is measured, and the MgO concentration of each simple coal is measured based on the compounding ratio [mass%] of each simple coal. By weighting averaging, the MgO concentration of the coking coal (blended coal) can be calculated.
上記式（２）において、ｄ１，ｄ２，ｄ３及びｄ４は定数［−］である。本発明者が複数の石炭を用いて、原料炭中の窒素濃度（実測値）［質量％］、原料炭の最高流動度［−］、原料炭中のＭｇＯ濃度［質量％］と、この原料炭から製造されたコークス中の窒素濃度（実測値）［質量％］との関係を求めた結果によれば、定数ｄ１が０．１９４であり、定数ｄ２が０．４８７であり、定数ｄ３が０．０７２１であり、定数ｄ４が０．６９１である。 In the above equation (2), d1, d2, d3 and d4 are constants [−]. The present inventor used a plurality of coals to obtain the nitrogen concentration (measured value) [mass%] in the coking coal, the maximum fluidity [-] of the coking coal, and the MgO concentration [mass%] in the coking coal. According to the result of obtaining the relationship with the nitrogen concentration (measured value) [mass%] in the coke produced from charcoal, the constant d1 is 0.194, the constant d2 is 0.487, and the constant d3 is. It is 0.0721 and the constant d4 is 0.691.
上記式（２）によってコークス中の窒素濃度ＣＮ１を推定すれば、この推定結果に基づいて、原料炭中の窒素濃度ＣＮ２、原料炭の最高流動度ＭＦ及び原料炭中のＭｇＯ濃度のうちの少なくとも１つのパラメータを調整して、コークス中の窒素濃度ＣＮ１を調整することができる。具体的には、コークスを製造するとき、推定したコークス中の窒素濃度ＣＮ１が目標値となるように、所望の窒素濃度ＣＮ２、最高流動度ＭＦ及びＭｇＯ濃度を有する原料炭を用いることができる。この原料炭を乾留してコークスを製造すれば、このコークス中の窒素濃度を目標値とすることができる。 If the nitrogen concentration CN 1 in coke is estimated by the above formula (2), the nitrogen concentration CN 2 in the coking coal, the maximum fluidity MF of the coking coal, and the MgO concentration in the coking coal are based on this estimation result. The nitrogen concentration CN 1 in coke can be adjusted by adjusting at least one parameter of. Specifically, when producing coke, it is possible to use coking coal having a desired nitrogen concentration CN 2 , maximum fluidity MF and MgO concentration so that the estimated nitrogen concentration CN 1 in the coke becomes a target value. it can. If this coking coal is carbonized to produce coke, the nitrogen concentration in the coke can be set as a target value.
一方、上述したようにコークス中の窒素濃度ＣＮ１を低減する必要があるときには、原料炭における窒素濃度ＣＮ２、最高流動度ＭＦ及びＭｇＯ濃度をそれぞれ測定して、上記式（２）に基づいてコークス中の窒素濃度ＣＮ１を推定し、推定した窒素濃度ＣＮ１が低くなるように、原料炭を調整することができる。ここで、原料炭が単味炭であるときには、窒素濃度ＣＮ１が低くなるように、単味炭の種類（銘柄）を変更することができる。また、原料炭が配合炭であるときには、窒素濃度ＣＮ１が低くなるように、単味炭の種類（銘柄）を変更したり、各単味炭の配合比率を変更したりすることができる。 On the other hand, when it is necessary to reduce the nitrogen concentration CN 1 in the coke as described above, the nitrogen concentration CN 2 , the maximum fluidity MF and the MgO concentration in the coking coal are measured, respectively, and based on the above formula (2). The nitrogen concentration CN 1 in coke can be estimated, and the coking coal can be adjusted so that the estimated nitrogen concentration CN 1 becomes low. Here, when the coking coal is a simple coal, the type (brand) of the simple coal can be changed so that the nitrogen concentration CN 1 is low. Further, when the coking coal is a blended coal, the type (brand) of the simple coal can be changed or the blending ratio of each simple coal can be changed so that the nitrogen concentration CN 1 is low.
次に、推定方法２によるコークス中の窒素濃度ＣＮ１の推定精度を確認した。 Next, the estimation accuracy of the nitrogen concentration CN 1 in coke by the estimation method 2 was confirmed.
まず、複数種類の原料炭を用意し、各原料炭を乾留してコークスを製造した。そして、製造されたコークス中の窒素濃度を測定した。一方、各原料炭中の窒素濃度ＣＮ２と、各原料炭の最高流動度ＭＦと、各原料炭のＭｇＯ濃度をそれぞれ測定し、測定した窒素濃度ＣＮ２、最高流動度ＭＦ及びＭｇＯ濃度を上記式（２）に代入することにより、コークス中の窒素濃度ＣＮ１を推定した。 First, a plurality of types of coking coal were prepared, and each coking coal was carbonized to produce coke. Then, the nitrogen concentration in the produced coke was measured. On the other hand, the nitrogen concentration CN 2 in each coking coal, the maximum fluidity MF of each coking coal, and the MgO concentration of each coking coal were measured, and the measured nitrogen concentration CN 2 , the maximum fluidity MF, and the MgO concentration were measured as described above. The nitrogen concentration CN 1 in coke was estimated by substituting into equation (2).
図３には、上記式（２）に基づいて推定されたコークス中の窒素濃度（推定値）と、測定したコークス中の窒素濃度（実測値）との関係を示す。図３において、決定係数Ｒ２は０．６３４７であった。図３に示すように、推定方法２によれば、原料炭における窒素濃度ＣＮ２、最高流動度ＭＦ及びＭｇＯ濃度に基づいて、この原料炭から製造されたコークス中の窒素濃度ＣＮ１を把握することができる。 FIG. 3 shows the relationship between the nitrogen concentration in coke (estimated value) estimated based on the above formula (2) and the measured nitrogen concentration in coke (measured value). In FIG. 3, the coefficient of determination R 2 was 0.6347. As shown in FIG. 3, according to the estimation method 2, the nitrogen concentration CN 1 in the coke produced from this coking coal is grasped based on the nitrogen concentration CN 2 in the coking coal, the maximum fluidity MF and the MgO concentration. be able to.
（揮発分ＶＭの影響）
一方、原料炭に含まれる揮発分ＶＭがコークス中の窒素濃度に与える影響を検討した。原料炭中の揮発分ＶＭは原料炭の乾留中にガスとして脱離し、残渣がコークスとなる。この点を考慮すると、原料炭中の揮発分ＶＭは、原料炭中の窒素がコークス中で残留する割合（窒素残留率）と相関があると考えることもできる。
(Effect of volatile VM)
On the other hand, the effect of the volatile component VM contained in the coking coal on the nitrogen concentration in coke was investigated. The volatile matter VM in the coking coal is desorbed as a gas during carbonization of the coking coal, and the residue becomes coke. Considering this point, it can be considered that the volatile content VM in the coking coal correlates with the ratio of nitrogen in the coking coal remaining in the coke (nitrogen residual ratio).
しかし、図４に示す測定結果によれば、揮発分ＶＭ及び窒素残留率ＲＰの間には相関が見られなかった。図４において、横軸は原料炭の揮発分ＶＭ（実測値）［質量％］を示し、縦軸は窒素残留率（実測値）［質量％］を示す。揮発分ＶＭは、ＪＩＳ Ｍ８８１２の規定に基づいて測定した。また、窒素残留率ＲＰは、下記式（３）に基づいて算出した。 However, according to the measurement results shown in FIG. 4, no correlation was found between the volatile matter VM and the nitrogen residual rate RP. In FIG. 4, the horizontal axis represents the volatile content VM (measured value) [mass%] of the coking coal, and the vertical axis represents the nitrogen residual ratio (measured value) [mass%]. Volatile VM was measured according to JIS M8812. The nitrogen residual rate RP was calculated based on the following formula (3).
上記式（３）において、ＲＰは窒素残留率［質量％］であり、ＣＮ１はコークス中の窒素濃度［質量％］であり、ＣＮ２は原料炭中の窒素濃度［質量％］であり、Ｙｃはコークス歩留［％］である。窒素濃度ＣＮ１，ＣＮ２のそれぞれは、ＪＩＳ Ｍ８８１３の規定に基づいて測定した。コークス歩留Ｙｃは、原料炭を焼成して得られるコークス質量の焼成前の石炭質量に対する比であり、コークス質量及び石炭質量を測定することによって求められる。 In the above formula (3), RP is the nitrogen residual ratio [mass%], CN 1 is the nitrogen concentration [mass%] in coke, and CN 2 is the nitrogen concentration [mass%] in the coking coal. Yc is the coke yield [%]. Nitrogen concentrations CN 1 and CN 2 were measured in accordance with JIS M8813. The coke yield Yc is a ratio of the coke mass obtained by firing the coking coal to the coal mass before firing, and is obtained by measuring the coke mass and the coal mass.
図４に示す直線は、揮発分ＶＭ及び窒素残留率ＲＰの関係から得られた回帰直線であり、決定係数Ｒ２は０．２７０９であった。図４に示すように、揮発分ＶＭは、窒素残留率ＲＰと相関性が極めて低いことが分かった。 The straight line shown in FIG. 4 is a regression line obtained from the relationship between the volatile matter VM and the nitrogen residual rate RP, and the coefficient of determination R 2 was 0.2709. As shown in FIG. 4, it was found that the volatile content VM has an extremely low correlation with the nitrogen residual rate RP.
（コークス中の窒素濃度の調整）
次に、下記表１に示す５種類の石炭（単味炭）Ａ〜Ｅを用いて、コークス中の窒素濃度が目標値となるように、単味炭の組み合わせを調整して配合炭１，２を用意した。配合炭１については、コークス中の窒素濃度の目標値を１．１９［質量％］とした。配合炭２については、コークス中の窒素濃度の目標値を１．００［質量％］とした。
(Adjustment of nitrogen concentration in coke)
Next, using the five types of coal (single coal) A to E shown in Table 1 below, the combination of simple coal is adjusted so that the nitrogen concentration in the coke becomes the target value, and the compound coal 1, I prepared 2. For the blended coal 1, the target value of the nitrogen concentration in coke was set to 1.19 [mass%]. For the blended coal 2, the target value of the nitrogen concentration in coke was set to 1.00 [mass%].
下記表１には、各石炭Ａ〜Ｅについて、窒素濃度ＣＮ２、最高流動度ＭＦ及びＭｇＯ濃度の測定結果を示す。また、下記表２には、各配合炭１，２を構成する単味炭の配合比率［質量％］を示す。 Table 1 below shows the measurement results of the nitrogen concentration CN 2 , the maximum fluidity MF and the MgO concentration for each of the coals A to E. Further, Table 2 below shows the blending ratio [mass%] of the simple coals constituting the blended coals 1 and 2.
各配合炭１，２について、窒素濃度ＣＮ２、最高流動度ＭＦ及びＭｇＯ濃度を求めた。各配合炭１，２の窒素濃度ＣＮ２については、各配合炭１，２に含まれる各単味炭の窒素濃度を測定し、各単味炭の配合比率に基づいて各単味炭の窒素濃度を加重平均した値とした。 For each of the compounded coals 1 and 2, the nitrogen concentration CN 2 , the maximum fluidity MF and the MgO concentration were determined. For the nitrogen concentration CN 2 of each compound coal 1, 2, the nitrogen concentration of each simple coal contained in each compound coal 1 and 2 is measured, and the nitrogen concentration of each simple coal is measured based on the compounding ratio of each simple coal. The concentration was used as a weighted average value.
各配合炭１，２の最高流動度ＭＦについては、各配合炭１，２に含まれる各単味炭の最高流動度ＭＦを測定し、各単味炭の配合比率に基づいて各単味炭の最高流動度ＭＦを加重平均した値とした。各配合炭１，２のＭｇＯ濃度については、各配合炭１，２に含まれる各単味炭のＭｇＯ濃度を測定し、各単味炭の配合比率に基づいて各単味炭のＭｇＯ濃度を加重平均した値とした。 For the maximum fluidity MF of each compounded coal 1 and 2, the maximum fluidity MF of each simple coal contained in each compounded coal 1 and 2 is measured, and each simple coal is based on the compounding ratio of each simple coal. The maximum fluidity MF of was used as a weighted average value. Regarding the MgO concentration of each of the compounded coals 1 and 2, the MgO concentration of each simple coal contained in each of the compounded coals 1 and 2 is measured, and the MgO concentration of each simple coal is determined based on the compounding ratio of each simple coal. The weighted average value was used.
各配合炭１，２について、窒素濃度ＣＮ２、最高流動度ＭＦ及びＭｇＯ濃度を下記表３に示す。 Table 3 below shows the nitrogen concentration CN 2 , the maximum fluidity MF, and the MgO concentration for each of the compounded coals 1 and 2.
配合炭１について、上記表３に示す値（窒素濃度ＣＮ２、最高流動度ＭＦ及びＭｇＯ濃度）を上記式（２）に代入してコークス中の窒素濃度ＣＮ１を求めたところ、窒素濃度ＣＮ１が１．１９［質量％］であった。一方、実際に配合炭１を乾留してコークスを製造し、このコークス中の窒素濃度ＣＮ１を測定したところ、窒素濃度ＣＮ１が１．１９［質量％］であった。したがって、本実施形態の推定方法によれば、コークス中の窒素濃度の推定精度を確保することができた。 For the blended coal 1, the values shown in Table 3 above (nitrogen concentration CN 2 , maximum fluidity MF and MgO concentration) were substituted into the above formula (2) to obtain the nitrogen concentration CN 1 in coke. 1 was 1.19 [mass%]. On the other hand, when the coke was actually carbonized to produce coke and the nitrogen concentration CN 1 in the coke was measured, the nitrogen concentration CN 1 was 1.19 [mass%]. Therefore, according to the estimation method of the present embodiment, the estimation accuracy of the nitrogen concentration in coke could be ensured.
配合炭２について、上記表３に示す値（窒素濃度ＣＮ２、最高流動度ＭＦ及びＭｇＯ濃度）を上記式（２）に代入してコークス中の窒素濃度ＣＮ１を求めたところ、窒素濃度ＣＮ１が１．００［質量％］であった。一方、実際に配合炭２を乾留してコークスを製造し、このコークス中の窒素濃度ＣＮ１を測定したところ、窒素濃度ＣＮ１が１．００［質量％］であった。したがって、本実施形態の推定方法によれば、コークス中の窒素濃度の推定精度を確保することができた。 For the blended coal 2, the values shown in Table 3 above (nitrogen concentration CN 2 , maximum fluidity MF and MgO concentration) were substituted into the above formula (2) to obtain the nitrogen concentration CN 1 in coke. 1 was 1.00 [mass%]. On the other hand, when the mixed coal 2 was actually carbonized to produce coke and the nitrogen concentration CN 1 in the coke was measured, the nitrogen concentration CN 1 was 1.00 [mass%]. Therefore, according to the estimation method of the present embodiment, the estimation accuracy of the nitrogen concentration in coke could be ensured.
Claims (5)
コークスの製造に用いられる原料炭について、少なくとも原料炭中の窒素濃度を含むパラメータを測定し、
前記パラメータ及びコークス中の窒素濃度の相関関係と、測定した前記パラメータとに基づいて、前記原料炭から製造されるコークス中の窒素濃度を算出することを特徴とする推定方法。 A method of estimating the nitrogen concentration in coke,
For coking coal used in the production of coke, parameters including at least the nitrogen concentration in coking coal were measured.
An estimation method characterized in that the nitrogen concentration in coke produced from the coking coal is calculated based on the correlation between the parameters and the nitrogen concentration in coke and the measured parameters.
下記式（Ｉ）に基づいて、コークス中の窒素濃度を算出することを特徴とする請求項１に記載の推定方法。
The estimation method according to claim 1, wherein the nitrogen concentration in coke is calculated based on the following formula (I).
下記式（ＩＩ）に基づいて、コークス中の窒素濃度を算出することを特徴とする請求項１に記載の推定方法。
The estimation method according to claim 1, wherein the nitrogen concentration in coke is calculated based on the following formula (II).
調整した原料炭を乾留してコークスを製造することを特徴とするコークスの製造方法。 The coking coal is adjusted so that the nitrogen concentration in the coke estimated by the estimation method according to any one of claims 1 to 4 becomes a target value.
A method for producing coke, which comprises dry-distilling the prepared coking coal to produce coke.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2019103806A JP7295407B2 (en) | 2019-06-03 | 2019-06-03 | Method for estimating nitrogen concentration in coke and method for producing coke |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2019103806A JP7295407B2 (en) | 2019-06-03 | 2019-06-03 | Method for estimating nitrogen concentration in coke and method for producing coke |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2020197453A true JP2020197453A (en) | 2020-12-10 |
| JP7295407B2 JP7295407B2 (en) | 2023-06-21 |
Family
ID=73648480
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2019103806A Active JP7295407B2 (en) | 2019-06-03 | 2019-06-03 | Method for estimating nitrogen concentration in coke and method for producing coke |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP7295407B2 (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5014701A (en) * | 1973-06-09 | 1975-02-17 | ||
| JPS52147601A (en) * | 1976-06-02 | 1977-12-08 | Nippon Steel Corp | Manufacture of coke with low emission of no# |
| JPH06207933A (en) * | 1993-01-11 | 1994-07-26 | Nippon Steel Corp | Estimation of yield of product through carbonization of coal |
| JPH08297082A (en) * | 1995-04-27 | 1996-11-12 | Kawasaki Steel Corp | Fluidity estimation method of coal blend |
| JP2000282053A (en) * | 1999-04-01 | 2000-10-10 | Nippon Steel Corp | Adjustment of chlorine concentration in coke |
| JP2004285098A (en) * | 2003-03-19 | 2004-10-14 | Nippon Steel Corp | Fuel coke for sintering and method for producing the same |
| JP2009074048A (en) * | 2007-08-30 | 2009-04-09 | Jfe Steel Kk | Manufacturing method of metallurgical coke |
-
2019
- 2019-06-03 JP JP2019103806A patent/JP7295407B2/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5014701A (en) * | 1973-06-09 | 1975-02-17 | ||
| JPS52147601A (en) * | 1976-06-02 | 1977-12-08 | Nippon Steel Corp | Manufacture of coke with low emission of no# |
| JPH06207933A (en) * | 1993-01-11 | 1994-07-26 | Nippon Steel Corp | Estimation of yield of product through carbonization of coal |
| JPH08297082A (en) * | 1995-04-27 | 1996-11-12 | Kawasaki Steel Corp | Fluidity estimation method of coal blend |
| JP2000282053A (en) * | 1999-04-01 | 2000-10-10 | Nippon Steel Corp | Adjustment of chlorine concentration in coke |
| JP2004285098A (en) * | 2003-03-19 | 2004-10-14 | Nippon Steel Corp | Fuel coke for sintering and method for producing the same |
| JP2009074048A (en) * | 2007-08-30 | 2009-04-09 | Jfe Steel Kk | Manufacturing method of metallurgical coke |
Also Published As
| Publication number | Publication date |
|---|---|
| JP7295407B2 (en) | 2023-06-21 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP2020200360A (en) | Method for estimating coke strength after hot reaction and method for manufacturing coke | |
| JP5772277B2 (en) | Coke hot reaction strength estimation method | |
| JP2020197453A (en) | Method for estimating nitrogen concentration in coke and method of producing coke | |
| JP2007262296A (en) | Method for producing metallurgical coke | |
| JP6874502B2 (en) | Coke strength estimation method | |
| JP2005232350A (en) | Estimation method of coke strength after hot-reaction and manufacturing method of coke | |
| RU2675567C1 (en) | Coal assessment method and the coke production method | |
| JP5820668B2 (en) | Method for estimating maximum fluidity of raw material for coke production, blending method for raw material for coke production, and raw material for coke production produced by the blending method | |
| JP2019007943A (en) | Estimation method of coke strength | |
| JP2017171718A (en) | Intensity estimation method of coke and manufacturing method of coke | |
| JP2005194358A (en) | Method for estimating coke strength | |
| JP4551493B2 (en) | Manufacturing method of high strength coke | |
| JP4464835B2 (en) | Coke production method | |
| JP3742525B2 (en) | Adjustment method of chlorine concentration in coke | |
| JP2001133379A (en) | Method for estimating maximum fluidity of coal blend added with caking additive | |
| JP4279972B2 (en) | Method for producing blast furnace coke | |
| JPH09255967A (en) | Production of coke for blast furnace | |
| JP2018053295A (en) | Visible level evaluation method of exhaust gas of sintering machine and selection method of carbonaceous material for sintering | |
| JPH08143867A (en) | Estimation of production ratio of coal carbonization product | |
| JP5780011B2 (en) | Coke surface fracture strength estimation method and coke production method using the same | |
| JP4306406B2 (en) | Method for producing blast furnace coke | |
| JP2004224844A (en) | Method for producing coke | |
| JP7188245B2 (en) | Method for estimating surface fracture strength of blast furnace coke | |
| JP4888452B2 (en) | Method for producing blast furnace coke | |
| JPH1036855A (en) | Compounding method for coal to be used in producing coke |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A621 | Written request for application examination |
Free format text: JAPANESE INTERMEDIATE CODE: A621 Effective date: 20220203 |
|
| A977 | Report on retrieval |
Free format text: JAPANESE INTERMEDIATE CODE: A971007 Effective date: 20221223 |
|
| A131 | Notification of reasons for refusal |
Free format text: JAPANESE INTERMEDIATE CODE: A131 Effective date: 20230110 |
|
| A521 | Request for written amendment filed |
Free format text: JAPANESE INTERMEDIATE CODE: A523 Effective date: 20230228 |
|
| TRDD | Decision of grant or rejection written | ||
| A01 | Written decision to grant a patent or to grant a registration (utility model) |
Free format text: JAPANESE INTERMEDIATE CODE: A01 Effective date: 20230509 |
|
| A61 | First payment of annual fees (during grant procedure) |
Free format text: JAPANESE INTERMEDIATE CODE: A61 Effective date: 20230522 |
|
| R151 | Written notification of patent or utility model registration |
Ref document number: 7295407 Country of ref document: JP Free format text: JAPANESE INTERMEDIATE CODE: R151 |