JP5169662B2 - Caking filler for coke production with excellent grindability and its production method - Google Patents
Caking filler for coke production with excellent grindability and its production method Download PDFInfo
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本発明は、粉砕性に優れたコークス製造用粘結補填材とその製造方法に関する。 The present invention relates to a caking additive for coke production having excellent grindability and a method for producing the same.
高炉操業においては、炉内の通気性を確保し、安定操業を維持するため、還元材として、高強度のコークスが必要である。高強度のコークスを製造するためには、原料炭として、良質の強粘結炭が必要であるが、良質の強粘結炭は、世界的に枯渇状態にあるので、これまで、低品質の非粘結炭や非微粘結炭を原料炭として用いて高強度コークスを製造する方法が、数多く提案されている(特許文献1〜3、参照)。 In blast furnace operation, high-strength coke is required as a reducing material in order to ensure air permeability in the furnace and maintain stable operation. In order to produce high-strength coke, high-quality strong caking coal is required as coking coal. Many methods for producing high-strength coke using non-caking coal or non-caking coal as raw coal have been proposed (see Patent Documents 1 to 3).
低品質炭を原料炭として用いてコークスを製造する方法として、従来から低品質炭を粉砕、乾燥し、微粉炭と粗粒炭に分級し、微紛炭には粘結材を添加して混練し、粒子化又は擬似粒子化し、粒子化又は擬似粒子化した微粉炭と粗粒炭を配合して配合炭とし、コークス炉に装入する方法が知られている(特許文献4〜7、参照)。 As a method of producing coke using low-quality coal as raw coal, conventional low-quality coal is pulverized and dried, classified into pulverized coal and coarse coal, and kneaded by adding a caking additive to pulverized coal. In addition, there is known a method of blending pulverized coal and pulverized coal that have been granulated or pseudo-particulated into particles or pseudo-particles into coarse coal and charging them into a coke oven (see Patent Documents 4 to 7). ).
微紛炭に粘結材を添加して粒子化又は擬似粒子化することにより、石炭の搬送における発塵を抑制するとともに、配合炭を乾留する際に低品質炭の低い粘結性を補い、コークス強度を向上することが可能となる。なお、低品質炭の粘結性を改善し、コークス強度を向上する観点から微粉炭とともに粗粒炭に粘結材を添加してもよい。 By adding a caking agent to pulverized coal and making it into particles or pseudo-particles, while suppressing dust generation during coal transportation, it supplements the low caking properties of low quality coal when dry coal blending, Coke strength can be improved. A caking agent may be added to the coarse coal along with the pulverized coal from the viewpoint of improving the caking property of the low quality coal and improving the coke strength.
低品質炭の粘結性を改善するための粘結材としては、従来から、石炭系の粘結材(タール、ピッチ等)や、石油系粘結材等が用いられている(特許文献8〜11、及び、非特許文献1、参照)。 Conventionally, coal-based binders (tar, pitch, etc.), petroleum-based binders and the like have been used as binders for improving the caking properties of low-quality coal (Patent Document 8). To 11 and Non-Patent Document 1, for example).
粘結材の種類やその添加量によって、コークス強度の向上のみならず、石炭の搬送時やコークス炉装入時の発塵や、コークス炉壁における付着カーボンの生成及びコークス押出負荷などのコークス炉の操業に大きく影響するため、従来から、コークス強度向上、作業環境の改善及びコークス炉の操業安定化を目的とする配合炭に添加する粘結材の性状や、その添加量の設定条件が検討されてきた。 Coke ovens not only improve coke strength, but also generate dust during coal transportation and charging into the coke oven, generation of adhering carbon on the coke oven wall, and coke extrusion load, depending on the type and amount of binder. As a result, the properties of the caking additive added to the blended coal for the purpose of improving coke strength, working environment, and stabilizing the operation of the coke oven, and the setting conditions for the amount added have been studied. It has been.
本発明者らは、石油系重質残渣(原油から軽質分を取り除いた残渣)を有効に活用し、高強度(DI150 15で、84.5以上)のコークスを安定的に製造するために、石油系重質残渣を粘結材として配合炭に添加する、高強度コークスの製造方法を提案した(特許文献12〜15、参照)。 In order to stably produce high-strength (DI 150 15 , 84.5 or more) coke by effectively utilizing petroleum-based heavy residues (residues obtained by removing light components from crude oil). And the manufacturing method of the high intensity | strength coke which adds a petroleum-type heavy residue to a coal blend as a caking additive was proposed (refer patent documents 12-15).
石油系重質残渣は、コークス強度の向上代が大きい粘結補填材であるが、軟化点が70℃以上であり、常温で固体状態であるものの、粉砕機で粉砕中に温度が、直ぐに軟化点以上に上昇して軟化し、粉砕機に付着して、粉砕機の作業能率が低下するという、粉砕性が悪いという難点を抱えている(特許文献16、参照)。 Petroleum heavy residue is a caking filler with a large allowance for improving coke strength, but it has a softening point of 70 ° C or higher and is in a solid state at room temperature, but the temperature immediately softens during pulverization with a pulverizer. There is a problem that the grindability is poor, that is, it is softened by rising above the point, adheres to the grinder, and the working efficiency of the grinder decreases (see Patent Document 16).
これまで、石炭の性状を改質して、コークス強度を高めるとの観点から、重質油を活用して石炭の性状を改質する技術が提案されている(特許文献17、参照)が、石油系重質残渣と同等以上にコークス強度を向上するためには限界がある。一方、粉砕性を向上する点から石油系重質残渣の性状を改質する試みはなされていない。 So far, from the viewpoint of improving the properties of coal and increasing the coke strength, a technology for improving the properties of coal using heavy oil has been proposed (see Patent Document 17). There is a limit to improving the coke strength equal to or greater than that of petroleum heavy residues. On the other hand, no attempt has been made to improve the properties of petroleum heavy residues from the viewpoint of improving grindability.
安価な低品質炭を使用し、かつ高炉の生産性向上と高炉操業の安定化を達成するために、より一層のコークス強度の向上が求められるとともに、石炭事前処理及びコークス操業の効率化を可能とするために、粘結補填材の粉砕性に優れた役割は重要である。したがって、石油系重質残渣を粘結材として使用する上で、コークス強度の向上代が高い石油系重質残渣の粉砕性の改善が求められている。 In order to use inexpensive low-quality coal and improve blast furnace productivity and stabilize blast furnace operation, further improvement in coke strength is required, as well as efficient coal pretreatment and coke operation. Therefore, the role excellent in the grindability of the caking filler is important. Therefore, when using petroleum heavy residues as a caking additive, there is a need to improve the grindability of petroleum heavy residues that have a high margin for improving coke strength.
本発明は、コークス強度の向上の点で、コークス強度の向上代が高い粘結補填材として、石油系重質残渣の役割が重要であるとの認識にたち、石油系重質残渣の粉砕性を改善し、石炭事前処理及びコークス炉操業の効率化を図ることを課題とする。そして、本発明は、上記課題を解決することができる、粉砕性に優れた石油系重質残渣系の粘結補填材とその製造方法を提供することを目的とする。 The present invention recognizes that the role of petroleum heavy residues is important as a caking filler material with high coke strength improvement in terms of improving coke strength. The objective is to improve the efficiency of coal pretreatment and coke oven operation. An object of the present invention is to provide a petroleum heavy residue-based caking filler capable of solving the above-described problems and a method for producing the same.
本発明者らは、粘結補填材として使用する石油系重質残渣の粉砕性を改善する手法について鋭意検討した。その結果、溶融した石油系重質残渣に、微粉炭を添加、混合すると、粉砕性に優れた粘結補填材を製造することができることを見いだした。 The present inventors diligently studied a method for improving the pulverization property of petroleum heavy residues used as a caking filler. As a result, it was found that a caking filler with excellent grindability can be produced by adding and mixing pulverized coal to molten petroleum heavy residue.
本発明は、上記知見に基づいてなされたもので、その要旨は以下のとおりである。 This invention was made | formed based on the said knowledge, and the summary is as follows.
(1)石油系重質留分と微粉炭からなるコークス製造用粘結補填材を製造する方法において、
(a)溶融した石油系重質留分に、3mm以下が90%以上の粒度の粉炭を添加、混合し、次いで、
(b)石油系重質留分の軟化点以下の温度まで、冷却速度:20℃/分以上で冷却する
ことを特徴とする粉砕性に優れたコークス製造用粘結補填材の製造方法。
(1) In a method for producing a caking additive for coke production comprising a petroleum heavy fraction and pulverized coal,
(A) Add pulverized coal having a particle size of 90% or more to 3 mm or less to the melted petroleum heavy fraction, then mix,
(B) A method for producing a coking filler for coke production, which is excellent in grindability, characterized by cooling at a cooling rate of 20 ° C./min or higher to a temperature below the softening point of the petroleum heavy fraction.
(2)前記石油系重質留分が、溶剤脱瀝アスファルトであることを特徴とする上記(1)に記載の粉砕性に優れたコークス製造用粘結補填材の製造方法。 (2) The method for producing a caking additive for coke production as described in (1) above, wherein the heavy petroleum fraction is solvent deasphalted asphalt.
(3)前記石油系重質留分の軟化点が70℃以上であることを特徴とする上記(1)又は(2)に記載の粉砕性に優れたコークス製造用粘結補填材の製造方法。 (3) The method for producing a caking additive for coke production having excellent grindability according to the above (1) or (2), wherein the softening point of the petroleum heavy fraction is 70 ° C. or higher. .
(4)前記石油系重質留分100質量部に対し、微粉炭10〜200質量部を、添加、混合することを特徴とする上記(1)〜(3)のいずれかに記載の粉砕性に優れたコークス製造用粘結補填材の製造方法。 (4) The grindability according to any one of (1) to (3) above, wherein 10 to 200 parts by mass of pulverized coal is added to and mixed with 100 parts by mass of the petroleum heavy fraction. The production method of the caking filler for coke manufacture excellent in the.
(5)前記冷却の後、3mm以下が70%以上の粒度に粘結補填材を粉砕することを特徴とする上記(1)〜(4)のいずれかに記載の粉砕性に優れたコークス製造用粘結補填材の製造方法。 (5) Coke production excellent in grindability according to any one of (1) to (4) above, wherein after the cooling, the caking filler is pulverized to a particle size of 3% or less of 70% or more. Method for caking filler.
(6)上記(1)〜(5)のいずれかに記載の粉砕性に優れたコークス製造用粘結補填材の製造方法で製造したことを特徴とする粉砕性に優れたコークス製造用粘結補填材。 (6) The caking for coke production excellent in grindability, which is produced by the method for producing a caking additive for coke production excellent in grindability according to any one of the above (1) to (5). Supplementary material.
本発明によれば、微粉炭を用いて、コークス強度の向上代が高い石油系重質残渣を改質し、粉砕性に優れたコークス製造用粘結補填材を製造することができるので、この粘結補填材を低品質炭に添加して乾留することによりコークス強度を向上できるとともに、原料炭の事前処理及びコークス炉操業の効率を大きく高めることができる。 According to the present invention, pulverized coal can be used to modify a petroleum heavy residue having a high cost for improving coke strength, and a caking filler for coke production having excellent crushability can be produced. The coking strength can be improved by adding the caking filler to the low-quality coal and dry distillation, and the efficiency of the pretreatment of the raw coal and the operation of the coke oven can be greatly increased.
本発明を、図面に基づいて説明する。図1に、本発明の粘結補填材の製造工程(本発明工程、図1(b))と、従来の粘結補填材の製造工程(従来工程、図1(a))を対比して示す。 The present invention will be described with reference to the drawings. In FIG. 1, the manufacturing process of the caking filler of the present invention (the present invention process, FIG. 1 (b)) is compared with the manufacturing process of the conventional caking filler (the conventional process, FIG. 1 (a)). Show.
従来工程においては、反応装置1から、溶融状態で供給される石油系重質留分Zを、冷却装置2で、石油系重質留分Zの軟化点以下の温度に冷却し、その後、粗粉砕装置3に搬送して粗粉砕し、粘結補填材Zbを得る。
In the conventional process, the petroleum heavy fraction Z supplied in a molten state from the reactor 1 is cooled by the cooling device 2 to a temperature below the softening point of the petroleum heavy fraction Z, and then the crude heavy fraction Z It conveys to the grinding |
この粘結補填材Zbを、図2に示すように、原料ヤード5の堆積粘結補填材6aに搬送、堆積し、適宜、ホッパー7aに貯留する。そして、堆積石炭6からホッパー7を経て供給される石炭と、ホッパー7aから供給される粘結補填材Zbをベルトコンベア上で混合し、粉砕機8で粉砕し、コークス炉9に装入する。
As shown in FIG. 2, this caking filler Zb is transported and deposited on the deposited caking filler 6a in the
粘結補填材Zbは、石油精製により発生した石油系重質留分を固化したものであるので、そもそも、粉砕性が悪く、また、軟化点が70℃以上であり、常温で固体状態であるものの、粘結補填材の粉砕時に、少なからず発生する摩擦熱で粘結補填材の温度が上昇すると、容易に軟化し、粉砕機に付着し易くなり、一層、粉砕され難くなるという問題があった。 Since the caking filler Zb is obtained by solidifying a petroleum heavy fraction generated by petroleum refining, it is originally poorly pulverizable, has a softening point of 70 ° C. or higher, and is in a solid state at room temperature. However, when the caking filler is pulverized, if the temperature of the caking filler rises due to the frictional heat generated, there is a problem that the caking filler softens easily and adheres to the pulverizer, making it more difficult to grind. It was.
本発明工程においては、反応装置1から、溶融状態で供給される石油系重質留分Zと粒度3mm以下の粉炭Xを、混合装置4で混合する。混合後、溶融状態にある混合物を、冷却装置2で、石油系重質留分Zの軟化点以下の温度まで、冷却速度:20℃/分以上で冷却し、その後、粗粉砕装置3に搬送して粗粉砕し、石油系重質留分と粉炭からなる粘結補填材Zaを得ることができる。
In the process of the present invention, the petroleum heavy fraction Z supplied in a molten state and the pulverized coal X having a particle size of 3 mm or less are mixed by the mixing device 4 from the reactor 1. After mixing, the mixture in a molten state is cooled at a cooling rate of 20 ° C./min or more to a temperature below the softening point of the petroleum heavy fraction Z with the cooling device 2, and then conveyed to the
この粘結補填材Zaは、図2に示すように、原料ヤード5の堆積粘結補填材6aに搬送、堆積され、適宜、ホッパー7aに貯留される。なお、後の工程は、従来工程と同じである。
As shown in FIG. 2, the caking filler material Za is conveyed and deposited on the deposited caking filler material 6a in the
このように、本発明のコークス製造用粘結補填材の製造方法(本発明方法)は、
(a)溶融した石油系重質留分に、3mm以下が90%以上の粒度の粉炭を添加、混合し、次いで、
(b)石油系重質留分の軟化点以下の温度まで、冷却速度:20℃/分以上で冷却する
ことを特徴とする。
Thus, the manufacturing method of the caking filler for coke production of the present invention (the method of the present invention)
(A) Add pulverized coal having a particle size of 90% or more to 3 mm or less to the melted petroleum heavy fraction, then mix,
(B) It is characterized by cooling at a cooling rate of 20 ° C./min or more to a temperature below the softening point of the petroleum heavy fraction.
本発明製造方法で製造された粘結補填材(本発明粘結補填材)は、溶融した石油系重質留分に、3mm以下が90%以上の粒度の粉炭を添加、混合して製造されたものであるため、石油系重質留分中に微粉炭を分散状態で含有し、粘結補填材の粉砕時に、石油系重質留分中の微粉炭が破壊の起点となり、従来の粘結補填材(石油系重質留分)に比べ、粉砕性は著しく高くなる。 The caking filler produced by the production method of the present invention (the caking filler of the present invention) is produced by adding and mixing pulverized coal having a particle size of 3% or less of 90% or more to a molten petroleum heavy fraction. Therefore, the pulverized coal is contained in a dispersed state in the petroleum heavy fraction, and the pulverized coal in the petroleum heavy fraction becomes the starting point of destruction when the caking filler is pulverized. Compared with the filler (petroleum heavy fraction), the grindability is remarkably increased.
また、本発明粘結補填材は、石油系重質留分中に粉炭を含有しているので、石油系重質留分に比べて粘性が低く、また、微粉炭を分散状態で含有することで、加熱されても、粘性は低いまま維持される。 Moreover, since the caking filler of the present invention contains pulverized coal in the petroleum heavy fraction, it has a lower viscosity than the petroleum heavy fraction, and contains pulverized coal in a dispersed state. Even when heated, the viscosity remains low.
このため、本発明粘結補填材を粉砕する際に、粉砕機内部で生じる摩擦熱で、粘結補填材の温度が上昇しても、軟化による粉砕機への付着量は極めて少なくなり、粉砕性の低下は抑制される。 For this reason, when crushing the caking filler of the present invention, even if the temperature of the caking filler rises due to frictional heat generated inside the crusher, the amount of adhesion to the crusher due to softening becomes extremely small, and crushing The decline in sex is suppressed.
本発明粘結補填材の上記粉砕性の向上効果は、溶融した石油系重質留分に添加する粉炭の粒度を3mm以下が90%以上とし、石油系重質留分中に微粉炭を分散状態で含有させることによって発揮される。 The effect of improving the pulverization property of the caking filler of the present invention is that the particle size of the pulverized coal added to the molten petroleum heavy fraction is 3 mm or less and 90% or more, and the pulverized coal is dispersed in the petroleum heavy fraction. It is demonstrated by making it contain in a state.
微粉炭の粒度が上記粒度範囲より粗い場合には、石油系重質留分中に微粉炭を分散状態で存在させることは困難となり、粉砕時の摩擦熱による軟化を抑制し、粘結性低下を維持する十分な効果は得られなくなる。 When the particle size of the pulverized coal is coarser than the above particle size range, it becomes difficult for the pulverized coal to be present in a dispersed state in the heavy petroleum fraction, suppressing softening due to frictional heat during pulverization and reducing caking properties. It is impossible to obtain a sufficient effect of maintaining the above.
溶融した石油系重質留分に3mm以下が90%以上の粒度の粉炭を添加、混合した溶融混合物は、石油系重質留分の軟化点以下の温度まで、冷却速度:20℃/分以上で冷却される。 The molten mixture obtained by adding pulverized coal with a particle size of 90% or more to 3 mm or less to the melted petroleum heavy fraction is cooled to a temperature below the softening point of the petroleum heavy fraction, cooling rate: 20 ° C./min or more. Cooled by.
この急冷により、固化した粘結補填材に不均一な歪が蓄積され、この不均一歪みが、分散状態で存在する3mm以下が90%以上の粒度の粉炭との相乗作用により、粘結補填材の粉砕性はより向上する。 Due to this rapid cooling, non-uniform strain is accumulated in the solidified caking filler material, and this non-uniform strain is caused by a synergistic action with pulverized coal having a particle size of 90% or more of 3 mm or less existing in a dispersed state. The grindability of the is improved.
微粉炭の粒度が上記粒度より粗い場合には、石油系重質留分中に微粉炭を分散状態で存在させることは困難となり、粉砕時の摩擦熱による軟化を抑制し、粘性低下を維持する十分な効果は得られなくなる。 When the particle size of the pulverized coal is coarser than the above particle size, it becomes difficult for the pulverized coal to be present in a dispersed state in the petroleum heavy fraction, and softening due to frictional heat during pulverization is suppressed and viscosity reduction is maintained. A sufficient effect cannot be obtained.
溶融混合物を石油系重質留分の軟化点以下の温度まで冷却する際の冷却速度が20℃/分より遅い場合は、固化した粘結補填材中への不均一歪の導入は困難となり、不均一歪みによる粘結補填材の粉砕性向上効果は十分に得られなくなる。 If the cooling rate when cooling the molten mixture to a temperature below the softening point of the petroleum heavy fraction is slower than 20 ° C./min, it becomes difficult to introduce non-uniform strain into the solidified caking filler, The effect of improving the grindability of the caking filler due to non-uniform strain cannot be obtained sufficiently.
このように、本発明粘結補填材は、上記(a)及び(b)により、石油系重質留分中に分散状態で微粉炭を含有させるとともに、不均一歪みを蓄積させることで、石油系重質留分を改質し、粘結補填材を粉砕する際の粉砕機への付着量を著しく少なくでき、石油系重質留分に比べて粉砕性を著しく向上することができる。 As described above, the caking filler of the present invention contains pulverized coal in a dispersed state in the petroleum heavy fraction and accumulates non-uniform strain by the above (a) and (b). When the heavy system fraction is modified and the caking filler is pulverized, the amount of adhesion to the pulverizer can be remarkably reduced, and the grindability can be remarkably improved as compared with the petroleum heavy fraction.
また、石油系重質留分は、コークス強度向上代が高く、また、石油系重質留分の改質するために添加する微粉炭は、コークス製造用の原料炭を用いることができるため、微粉炭の添加により石油系重質留分のコークス向上効果が低下するものではない。 In addition, the petroleum heavy fraction has a high coke strength improvement allowance, and the pulverized coal added to improve the petroleum heavy fraction can use raw coal for coke production, The addition of pulverized coal does not reduce the coke improvement effect of petroleum heavy fractions.
粘結補填材の粉砕性の向上効果を発現する上で、石油系重質留分に添加する微粉炭の銘柄、性状は特に限定されない。 The brand and properties of the pulverized coal added to the petroleum heavy fraction are not particularly limited in order to express the effect of improving the grindability of the caking filler.
石油系重質留分は、成分及び/又は性質の点から限定されるものではないが、軟化点が70℃以上の石油系重質留分が、取扱いが容易であるので、好ましい。特に、石油系重質留分として、石油精製工程で発生する溶剤脱瀝アスファルトを用いることが好ましい。 The petroleum heavy fraction is not limited in terms of components and / or properties, but a petroleum heavy fraction having a softening point of 70 ° C. or higher is preferable because it is easy to handle. In particular, it is preferable to use solvent deasphalted asphalt generated in the petroleum refining process as the petroleum heavy fraction.
ここで、溶剤脱瀝アスファルトとは、アスファルトを溶剤脱瀝処理することにより得られた残渣のことである。 Here, the solvent deasphalting asphalt is a residue obtained by subjecting asphalt to a solvent desulfurizing treatment.
さらに、本発明によれば、3mm以下が90%以上の粒度の粉炭中に含まれる、発塵の原因となる0.5mm以下の微粉炭、さらには、0.3mm以下の微粉炭を粘結補填材中に閉じ込めるので、コークス炉までの搬送時及びコークス装入時の発塵を抑制し、コークス炉装入時の発塵による炉壁の付着カーボンの生成量を低減し、及び付着カーボンの生成によるコークス押し出し負荷の増大を抑制することができる。 Furthermore, according to the present invention, pulverized coal of 0.5 mm or less that causes dust generation, and further pulverized coal of 0.3 mm or less contained in the pulverized coal having a particle size of 90% or more of 3 mm or less Since it is confined in the filler, it suppresses the generation of dust when transporting to the coke oven and when charging the coke, reduces the amount of carbon adhering to the furnace wall due to dust generation when charging the coke oven, and An increase in coke extrusion load due to generation can be suppressed.
石油系重質留分に添加する粉炭の混合割合は、粘結補填材の粉砕性を確保することができる限りにおいて、特に、限定されない。 The mixing ratio of the pulverized coal added to the petroleum heavy fraction is not particularly limited as long as the crushability of the caking filler can be secured.
しかし、石油系重質留分の量に対して、粉炭の量が多過ぎると、溶融した石油系重質留分と混合する際に、溶融混合物の粘性が急低下し、取扱いが難しくなり、また、石油系重質留分の量に対して、粉炭の量が少なすぎると、当然に、粘結補填材の粉砕性向上効果が十分に発現しなくなる。 However, if the amount of pulverized coal is too much for the amount of heavy petroleum fractions, the viscosity of the molten mixture will drop sharply when mixed with molten heavy petroleum fractions, making handling difficult, In addition, if the amount of pulverized coal is too small relative to the amount of heavy petroleum-based fraction, naturally, the effect of improving the pulverization of the caking filler is not sufficiently exhibited.
それ故、溶融混合物の取り扱い性を良好に維持しつつ、粉砕性に優れた粘結補填材を製造するために、石油系重質留分100質量部に対し、粉炭10〜200質量部を、添加、混合することが好ましい。石油系重質留分100質量部に対して、粉炭を10質量部未満となると、粘結補填材の粉砕性向上効果が十分に発現しなくなる。 Therefore, in order to produce a caking filler excellent in grindability while maintaining good handling of the molten mixture, 10 to 200 parts by mass of pulverized coal is added to 100 parts by mass of petroleum heavy fraction. It is preferable to add and mix. When the amount of pulverized coal is less than 10 parts by mass with respect to 100 parts by mass of the petroleum heavy fraction, the effect of improving the pulverization of the caking filler is not sufficiently exhibited.
また、石油系重質留分100質量部に対して、粉炭を200質量部超の場合には、溶融混合物の粘性が急低下し、取扱いが難しくなる。 In addition, when the amount of pulverized coal exceeds 200 parts by mass with respect to 100 parts by mass of the petroleum heavy fraction, the viscosity of the molten mixture is rapidly reduced, and handling becomes difficult.
本発明粘結補填材は、冷却の後、粉砕されて、原料炭とともに、コークス炉に装入される。粉砕後の粒径は、特に、限定されないが、原料炭との均一混合を図る観点から、3mm以下が70%以上の粒度に粘結補填材を粉砕することが好ましい。 The caking filler of the present invention is pulverized after cooling and charged into a coke oven together with raw coal. The particle size after pulverization is not particularly limited, but from the viewpoint of achieving uniform mixing with the raw coal, it is preferable to pulverize the caking filler to a particle size of 3% or less and 70% or more.
なお、本発明において、粘結補填材の粉砕性は、以下のような方法で評価することができる。 In the present invention, the pulverizability of the caking filler can be evaluated by the following method.
一般に石炭の粉砕性を評価する指標として、JIS M8801に記載の方法により測定されるHGI(ハードグローブインデックス)が知られている。 In general, HGI (Hard Grove Index) measured by the method described in JIS M8801 is known as an index for evaluating coal pulverizability.
しかし、この方法により測定されるHGI(ハードグローブインデックス)は、石炭を対象とする指標であって、石炭に比べてはるかに低い軟化点を有する粘結補填材の粉砕性を評価する方法としては適さない。 However, the HGI (hard glove index) measured by this method is an index for coal, and is a method for evaluating the grindability of a caking filler having a much lower softening point than coal. Not suitable.
本発明では、粘結補填材の粉砕性を評価する方法として、例えば、粉砕能力が50−500kg/hの小型粉砕機(ハンマー式クラッシャー)を用いて粘結補填材を、200kg/hの処理速度で2時間粉砕した後、粉砕機内部(ハンマーおよびケーシング)に付着した粘結補填材を回収し、その付着量の測定値を基に粘結補填材の粉砕性を評価する。 In the present invention, as a method for evaluating the crushability of the caking filler, for example, the caking filler is treated at a rate of 200 kg / h using a small crusher (hammer crusher) having a crushing capacity of 50 to 500 kg / h. After crushing at a speed for 2 hours, the caking filler adhering to the inside of the crusher (hammer and casing) is collected, and the crushability of the caking filler is evaluated based on the measured amount of adhesion.
この評価方法における粘結補填材の粉砕性の評価基準は、予め、水分を調整して粉砕機の付着性を変えた複数の石炭試料を用意し、上記の方法で付着性の異なる複数の石炭試料を粉砕し、粉砕機の連続稼動を可能とする付着量(実験では、水分15%の石炭試料を粉砕する場合の付着量に相当する)の上限値(0.5kg)を粉砕性の評価基準とする。 The evaluation criteria for the crushability of the caking filler in this evaluation method are prepared in advance by preparing a plurality of coal samples in which moisture is adjusted to change the adhesion of the crusher, and a plurality of coals having different adhesion properties by the above method. The upper limit (0.5 kg) of the amount of deposit that pulverizes the sample and enables continuous operation of the pulverizer (corresponding to the amount of deposit when pulverizing a 15% moisture coal sample in the experiment) is evaluated for grindability The standard.
つまり、本発明における粘結補填材の粉砕性評価は、上記の方法で粘結補填材を粉砕した後、粉砕機内部の付着量が、上記粉砕性の評価基準の付着量以下である場合、粘結補填材の粉砕性は良好であるとし、評価基準の付着量を超える場合、粘結補填材の粉砕性は不良であると評価する。 That is, the evaluation of the crushability of the caking filler in the present invention, after crushing the caking filler material by the above method, when the adhesion amount inside the grinder is less than the adhesion amount of the crushability evaluation criteria, The pulverization property of the caking filler is considered to be good. When the adhesion amount exceeds the evaluation standard, the pulverizing property of the caking filler is evaluated to be poor.
次に、本発明の実施例について説明するが、実施例の条件は、本発明の実施可能性及び効果を確認するために採用した一条件例であり、本発明は、この一条件例に限定されるものではない。本発明は、本発明の要旨を逸脱せず、本発明の目的を達成する限りにおいて、種々の条件を採用し得るものである。 Next, examples of the present invention will be described. The conditions of the examples are one example of conditions adopted for confirming the feasibility and effects of the present invention, and the present invention is limited to this one example of conditions. Is not to be done. The present invention can adopt various conditions as long as the object of the present invention is achieved without departing from the gist of the present invention.
(実施例1)
石油系重質留分として、表1に示す軟化点の石油重質留分(アスファルト)を溶剤抽出処理して軽質油を分離した後の残渣(溶剤脱瀝アスファルト)を用い、この溶剤脱瀝アスファルトを温度250℃程度に加温して溶解させ、粉炭を添加し、表1に示す製造条件で、粘結補填材を製造した後、得られた粘結補填材の粉砕性を評価した。
Example 1
As the petroleum heavy fraction, the residue (solvent deasphalted) after separation of the light oil by solvent extraction of the heavy petroleum fraction (asphalt) with the softening point shown in Table 1 is used to remove this solvent. Asphalt was heated to a temperature of about 250 ° C. and dissolved, pulverized coal was added, and after the caking filler was produced under the production conditions shown in Table 1, the grindability of the obtained caking filler was evaluated.
その結果も、表1に示す。なお、粉炭は、揮発分量(VM):28%、全膨張率(TD):50%の配合炭を用いた。 The results are also shown in Table 1. In addition, the coal blend used the volatile matter amount (VM): 28% and total expansion coefficient (TD): 50%.
粘結補填材の粉砕性の評価は、粉砕能力が50−500kg/hの小型粉砕機(ハンマー式クラッシャー)を用いて粘結補填材を、200kg/hの処理速度で2時間粉砕した後、粉砕機内部(ハンマーおよびケーシング)に付着した粘結補填材を回収し、その付着量の測定値を基に粘結補填材の評価を行った。 The crushability of the caking filler was evaluated by crushing the caking filler at a processing rate of 200 kg / h for 2 hours using a small crusher (hammer crusher) having a crushing capacity of 50 to 500 kg / h. The caking filler material adhering to the inside of the pulverizer (hammer and casing) was collected, and the caking filler material was evaluated based on the measured value of the adhering amount.
粘結補填材の粉砕性の評価基準は、予め、水分を調整して粉砕機の付着性を変えた複数の石炭試料を用意し、上記の方法で付着性の異なる複数の石炭試料を粉砕し、粉砕機の連続稼動を可能とする付着量(実験では、水分15%の石炭試料を粉砕する場合の付着量に相当する)の上限値(0.5kg)を粉砕性の評価基準とした。 The evaluation criteria for the crushability of the caking filler material are prepared in advance by preparing a plurality of coal samples whose moisture is adjusted to change the adhesion of the crusher, and crushing a plurality of coal samples having different adhesion properties by the above method. The upper limit (0.5 kg) of the amount of adhesion that enables continuous operation of the pulverizer (corresponding to the amount of adhesion in the case of pulverizing a 15% moisture coal sample in the experiment) was used as an evaluation standard for pulverization.
表1に示す粘結補填材の粉砕性の評価は、上記の方法で粘結補填材を粉砕した後、粉砕機内部の付着量が、上記粉砕性の評価基準の付着量以下である場合、粘結補填材の粉砕性は良好であるとし、評価基準の付着量を超える場合、粘結補填材の粉砕性は不良であると評価した。 Evaluation of the crushability of the caking filler shown in Table 1 after crushing the caking filler by the above method, when the adhesion amount inside the pulverizer is less than the adhesion amount of the crushability evaluation criteria, The pulverizing property of the caking filler was determined to be good. When the adhesion amount exceeded the evaluation standard, the pulverizing property of the caking filler was evaluated to be poor.
表1から、粘結補填材に添加する石炭の粒度、冷却温度及び冷却速度が、本発明で規定する範囲内の条件で実施した発明例1〜5は、粉砕機の連続稼動を可能とする付着量の上限値(0.5kg)以下であり、粘結補填材の粉砕性は向上している。 From Table 1, Invention Examples 1 to 5 implemented under conditions in which the particle size, cooling temperature, and cooling rate of the coal added to the caking filler are within the range specified in the present invention enable continuous operation of the pulverizer. It is below the upper limit (0.5 kg) of the adhesion amount, and the crushability of the caking filler is improved.
一方、粘結補填材に添加する石炭の粒度、冷却温度及び冷却速度が、本発明で規定する範囲から外れた条件で実施した比較例1〜4は、付着量が1.0〜4.0と、粉砕機の連続稼動を可能とする付着量の上限値(0.5kg)よりかなり高く、粘結補填材の粉砕性は劣っている。 On the other hand, Comparative Examples 1 to 4 carried out under conditions where the particle size, cooling temperature and cooling rate of the coal added to the caking filler deviate from the range defined in the present invention have an adhesion amount of 1.0 to 4.0. And the upper limit (0.5 kg) of the adhesion amount that enables continuous operation of the pulverizer, the caking property of the caking filler is inferior.
(実施例2)
発明例1及び発明例4で製造した粘結補填材を−3mm 80%の粒度に粉砕した後、−3mm 80%に粉砕した揮発分量(VM):28%、全膨張率(TD):50%の配合炭に対して6%添加し、コークス炉で乾留してコークスを製造した。なお、全溶剤脱瀝ピッチの配合炭に対する比率は半分の3%となる。
(Example 2)
The caking filler produced in Invention Example 1 and Invention Example 4 was pulverized to a particle size of -3 mm and 80%, and then pulverized to -3 mm and 80% (VM): 28%, total expansion coefficient (TD): 50 The coke was produced by adding 6% to the coal blend of 5% and dry-distilling in a coke oven. Note that the ratio of the total solvent degassed pitch to the blended coal is half, 3%.
コークスの製造は、装入嵩密度:0.85t/m3でコークス炉に装入し、炉温:1250℃の条件で乾留時間:18.5hで乾留した後、得られたコークスのドラム強度指数DI150 15を測定した。 The coke is produced by charging into a coke oven at a charging bulk density of 0.85 t / m 3 , subjecting the oven to a dry distillation time of 18.5 h under the condition of a furnace temperature of 1250 ° C., and a drum strength of the obtained coke. The index DI 150 15 was measured.
比較例として、同じ配合炭のみ(粘結補填材を添加しない条件)を同一条件で、コークス炉で乾留し、コークス強度を測定した。その結果、コークスのDI150 15は、85.0であった。 As a comparative example, only the same blended coal (conditions in which no caking filler was added) was subjected to dry distillation in a coke oven under the same conditions, and coke strength was measured. As a result, the DI 150 15 of coke was 85.0.
これに対して、発明例1で製造した粘結補填材を添加した場合のコークスのDI150 15は、86.0であり、発明例4で製造した粘結補填材を添加した場合のコークスのDIは、86.2であり、何れの場合も高い強度のコークスを製造できた。 On the other hand, the DI 150 15 of coke when the caking filler produced in Invention Example 1 is added is 86.0, and the coke when the caking filler produced in Invention Example 4 is added. DI was 86.2, and high strength coke could be produced in any case.
前述したように、本発明によれば、微粉炭を用いて、粉砕性に優れたコークス製造用粘結補填材を製造することができるので、原料炭の調製作業を効率化し、コークス炉操業の効率を大きく高めることができる。したがって、本発明は、コークス製造産業及び鉄鋼産業において、利用可能性が大きいものである。 As described above, according to the present invention, it is possible to produce a coking filler for coke production that is excellent in pulverization using pulverized coal. The efficiency can be greatly increased. Therefore, the present invention has great applicability in the coke manufacturing industry and the steel industry.
1 反応装置
2 冷却装置
3 粗粉砕装置
4 混合装置
5 原料ヤード
6 堆積石炭
6a 堆積粘結補填材
7、7a ホッパー
8 粉砕機
9 コークス炉
X 粉炭
Z、Zb 粘結補填材(従来)
Za 粘結補填材(本発明)
DESCRIPTION OF SYMBOLS 1 Reactor 2
Za caking filler (present invention)
Claims (6)
(a)溶融した石油系重質留分に、3mm以下が90%以上の粒度の粉炭を添加、混合し、次いで、
(b)石油系重質留分の軟化点以下の温度まで、冷却速度:20℃/分以上で冷却する
ことを特徴とする粉砕性に優れたコークス製造用粘結補填材の製造方法。 In the method of producing a caking filler for coke production comprising a petroleum heavy fraction and pulverized coal,
(A) Add and mix pulverized coal having a particle size of 3% or less of 90% or more to the melted petroleum heavy fraction,
(B) A method for producing a coking filler for coke production, which is excellent in grindability, characterized by cooling at a cooling rate of 20 ° C./min or higher to a temperature below the softening point of the petroleum heavy fraction.
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