JP2012162604A - Method for producing modified coal - Google Patents

Method for producing modified coal Download PDF

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JP2012162604A
JP2012162604A JP2011022287A JP2011022287A JP2012162604A JP 2012162604 A JP2012162604 A JP 2012162604A JP 2011022287 A JP2011022287 A JP 2011022287A JP 2011022287 A JP2011022287 A JP 2011022287A JP 2012162604 A JP2012162604 A JP 2012162604A
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coal
separation
molding
pulverized
pulverized coal
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Keiichi Nakagawa
慶一 中川
Setsuo Omoto
節男 大本
Keiji Tanizaki
桂二 谷崎
Junji Asahara
淳司 浅原
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Mitsubishi Heavy Industries Ltd
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Abstract

PROBLEM TO BE SOLVED: To solve the problem that the effective utilization of pulverized coal generated from raw material coal is strongly requested.SOLUTION: The method includes: a first separation/recovery step S11 of separating and recovering pulverized coal 11a generated from low-grade coal 11; a drying step S12 of drying the low-grade coal 11 passing through the first separation/recovery step S11 to obtain dried coal 12; a pre-molding step S13 of molding the pulverized coal 11a recovered in the first separation/recovery step S11 to obtain pre-molded coal 13; a carbonization step S14 of carbonizing the dried coal 12 and the pre-molded coal 13 to obtain carbonized coal 14; and a normal molding step S15 of molding the carbonized coal 14 to obtain modified coal 15.

Description

本発明は、改質石炭の製造方法に関し、特に、褐炭や亜瀝青炭等のような水分含有量の多い低品位石炭（低質炭）を改質して改質石炭を得る場合に適用すると有効なものである。   The present invention relates to a method for producing reformed coal, and is particularly effective when applied to a case where reformed coal is obtained by reforming low-grade coal (low quality coal) having a high water content such as lignite and subbituminous coal. Is.

褐炭や亜瀝青炭等のような水分含有量の多い低品位石炭（低質炭）は、埋蔵量が多いものの、単位重量当たりの発熱量が低いと共に、輸送効率が悪いため、加熱処理して乾燥させることにより、単位重量当たりの発熱量を高めると共に、圧縮成形することにより、ハンドリング性を高めるようにしている。   Low grade coal (low quality coal) with high water content such as lignite and subbituminous coal has high reserves but has low calorific value per unit weight and poor transport efficiency. As a result, the calorific value per unit weight is increased and the handleability is improved by compression molding.

特開２００１−２００２６９号公報JP 2001-200269 A

前述したようにして低質炭を改質するにあたっては、原料石炭から発生した微粉炭を山元へ廃棄処理している。このため、上記微粉炭の廃棄処理にコストがかかってしまい、当該微粉炭を有効利用することが強く求められている。   As described above, when reforming low quality coal, pulverized coal generated from raw coal is disposed of at the base. For this reason, the cost of disposal of the pulverized coal is high, and there is a strong demand for effective use of the pulverized coal.

前述した課題を解決するための、第一番目の発明に係る改質石炭の製造方法は、原料石炭から発生する微粉炭を分離回収する第一分離回収工程と、前記第一分離回収工程を経た前記原料石炭を乾燥して乾燥炭を得る乾燥工程と、前記第一分離回収工程で回収された前記微粉炭を成型してプレ成型炭を得るプレ成型工程と、前記乾燥炭及び前記プレ成型炭を乾留して乾留炭を得る乾留工程と、前記乾留炭を成型して改質石炭を得る本成型工程とを行うことを特徴とする。   The method for producing modified coal according to the first invention for solving the above-described problems has undergone the first separation and recovery step of separating and recovering pulverized coal generated from raw coal, and the first separation and recovery step. A drying step of drying the raw coal to obtain dry coal, a pre-molding step of obtaining the pre-formed coal by molding the pulverized coal recovered in the first separation and recovery step, the dry coal and the pre-formed coal The carbonization process is characterized in that a carbonization process for obtaining carbonized carbon by carbonization and a main molding process for molding the carbonized carbon to obtain a modified coal are performed.

第二番目の発明に係る改質石炭の製造方法は、第一番目の発明において、前記乾燥工程で発生した微粉炭を分離回収する第二分離回収工程をさらに行うと共に、前記プレ成型工程が、前記第二分離回収工程で回収された前記微粉炭を、前記第一分離回収工程で回収された前記微粉炭と共に成型してプレ成型炭を得る工程であることを特徴とする。   The method for producing the modified coal according to the second invention further comprises a second separation and recovery step for separating and recovering the pulverized coal generated in the drying step in the first invention, and the pre-molding step comprises: The pulverized coal recovered in the second separation / recovery step is molded together with the pulverized coal recovered in the first separation / recovery step to obtain pre-formed coal.

第三番目の発明に係る改質石炭の製造方法は、第一番目又は第二番目の発明において、前記原料石炭が、低品位石炭であることを特徴とする。   The method for producing a modified coal according to a third aspect is characterized in that, in the first or second aspect, the raw material coal is low-grade coal.

本発明に係る改質石炭の製造方法によれば、原料石炭から発生した微粉炭を改質石炭の原料として利用することができるので、上記微粉炭を有効利用して、当該微粉炭の廃棄処理に係るコストを削減することができる。   According to the method for producing modified coal according to the present invention, since the pulverized coal generated from the raw coal can be used as the raw material of the modified coal, the pulverized coal is disposed of by effectively using the pulverized coal. The cost concerning can be reduced.

本発明に係る改質石炭の製造方法の第一番目の実施形態の手順フロー図である。It is a procedure flow figure of a first embodiment of a manufacturing method of reformed coal concerning the present invention. 本発明に係る改質石炭の製造方法の第二番目の実施形態の手順フロー図である。It is a procedure flow figure of a 2nd embodiment of a manufacturing method of reformed coal concerning the present invention.

本発明に係る改質石炭の製造方法の実施形態を図面に基づいて以下に説明するが、本発明は図面に基づいて説明する以下の実施形態のみに限定されるものではない。   Embodiments of a method for producing modified coal according to the present invention will be described below with reference to the drawings. However, the present invention is not limited to the following embodiments described with reference to the drawings.

［第一番目の実施形態］
本発明に係る改質石炭の製造方法の第一番目の実施形態を図１に基づいて説明する。 [First embodiment]
1st Embodiment of the manufacturing method of the modified coal which concerns on this invention is described based on FIG.

本実施形態に係る改質石炭の製造方法は、図１に示すように、原料石炭である低品位石炭（低質炭）１１から発生する微粉炭１１ａを分離回収する第一分離回収工程Ｓ１１と、第一分離回収工程Ｓ１１を経た低質炭１１を乾燥して乾燥炭１２を得る乾燥工程Ｓ１２と、第一分離回収工程Ｓ１１で回収された微粉炭１１ａを成型してプレ成型炭１３を得るプレ成型工程Ｓ１３と、乾燥炭１２及びプレ成型炭１３を乾留して乾留炭１４を得る乾留工程Ｓ１４と、乾留炭１４を成型して改質石炭１５を得る本成型工程Ｓ１５とを行うものである。   As shown in FIG. 1, the method for producing reformed coal according to this embodiment includes a first separation and recovery step S11 for separating and recovering pulverized coal 11a generated from low-grade coal (low-quality coal) 11 that is raw coal, A pre-molded charcoal 13 is obtained by drying the low-quality charcoal 11 that has undergone the first separation / collection process S11 to obtain a dry charcoal 12 and a pulverized charcoal 11a collected in the first separation / collection process S11. Step S13, dry distillation step S14 for dry-drying dry coal 12 and pre-formed coal 13 to obtain dry-distilled coal 14, and main forming step S15 for forming modified coal 15 by forming dry-distilled coal 14 are performed.

前記低質炭１１は、褐炭や亜瀝青炭等のような水分含有量が多い石炭であり、埋蔵量が多いものの、単位重量当たりの発熱量が低いと共に、輸送効率が悪いものである。   The low quality coal 11 is a coal having a high water content such as lignite and subbituminous coal, and has a large amount of reserves, but has a low calorific value per unit weight and a low transport efficiency.

前記第一分離回収工程Ｓ１１は、低質炭１１を乾燥工程Ｓ１２で乾燥処理する前の事前プロセスで生じた微粉炭１１ａ（直径約１ｍｍ未満）を当該低質炭１１から分離回収する工程であって、当該微粉炭１１ａは、上記低質炭１１の搬送途中等で落下して消極的（結果的）に分離回収されたものがほとんどであり、従来、山元へ廃棄処理されていたものであるが、上記低質炭１１に振動等をあえて加えて積極的に分離回収したものを適用することも可能である。   The first separation and recovery step S11 is a step of separating and recovering the pulverized coal 11a (having a diameter of less than about 1 mm) generated in the prior process before the low quality coal 11 is dried in the drying step S12 from the low quality coal 11; Most of the pulverized coal 11a falls in the middle of conveyance of the low quality coal 11 and is passively (consecutively) separated and recovered, and is conventionally discarded to the mountain, It is also possible to apply the low-quality coal 11 that has been actively separated and recovered by adding vibration or the like.

前記乾燥工程Ｓ１２は、前記低質炭１１中から水分を除去する工程であり、例えば、ベルトコンベア式等の熱風乾燥機等に供給して熱風乾燥（１００〜２８０℃（好ましくは１５０〜２００℃））することにより、水分含有量を略０％とした乾燥炭１２を製造する。   The drying step S12 is a step of removing moisture from the low-quality coal 11, for example, supplied to a hot air dryer such as a belt conveyor type and hot air drying (100 to 280 ° C (preferably 150 to 200 ° C)). ) To produce dry charcoal 12 having a moisture content of approximately 0%.

前記プレ成型工程Ｓ１３は、前記低質炭１１から分離されて回収された前記微粉炭１１ａを圧縮することにより、粒状に成型してプレ成型炭１３（直径約数ｍｍ前後程度）とする工程であり、飛散等させることなく取り扱いやすくなるように加工している。   The pre-molding step S13 is a step in which the pulverized coal 11a separated and recovered from the low-quality coal 11 is compressed into a granular shape to form a pre-molded charcoal 13 (about a diameter of about several mm). It is processed so that it is easy to handle without splashing.

前記乾留工程Ｓ１４は、前記乾燥炭１２及び前記プレ成型炭１３を乾留してタール等の揮発成分を除去する工程であり、例えば、連続式の乾留機に上記乾燥炭１２と上記プレ成型炭１３とを供給し、高温（３００〜５００℃（好ましくは４００〜４５０℃））で乾留することにより、タール等の揮発成分を分離した乾留炭１４を製造する。   The carbonization step S14 is a step of carbonizing the dry charcoal 12 and the pre-formed charcoal 13 to remove volatile components such as tar. For example, the dry charcoal 12 and the pre-charcoal charcoal 13 are added to a continuous carbonizer. , And carbonized at a high temperature (300 to 500 ° C. (preferably 400 to 450 ° C.)) to produce carbonized carbon 14 from which volatile components such as tar are separated.

前記本成型工程Ｓ１５は、前記乾留炭１４を圧縮（１２００ｋｇ／ｃｍ2×３００〜４５０℃（好ましくは３５０〜４００℃））して円柱状やタドン状等のブリケットに成型する工程であり、ハンドリング性に優れた改質石炭１５を製造する。 The main molding step S15 is a step in which the carbonized carbon 14 is compressed (1200 kg / cm 2 × 300 to 450 ° C. (preferably 350 to 400 ° C.)) and molded into a briquette having a cylindrical shape or a tadon shape. The modified coal 15 having excellent properties is produced.

つまり、本実施形態では、従来、低質炭１１から発生して山元へ廃棄処理していた前記微粉炭１１ａを、粒状に圧縮成型して乾燥炭１２と共に乾留処理して成型加工することにより、改質石炭１５とするようにしたのである。   In other words, in the present embodiment, the pulverized coal 11a that has been generated from the low-quality coal 11 and discarded to the mountain base is compression-molded into a granular shape, and dry-distilled with the dry coal 12 to perform molding processing. The quality coal 15 was used.

このため、本実施形態においては、今まで廃棄処分されていた微粉炭１１ａを改質石炭１５の原料として利用することができる。   For this reason, in this embodiment, the pulverized coal 11a that has been disposed of up to now can be used as a raw material of the modified coal 15.

したがって、本実施形態によれば、微粉炭１１ａを有効利用して、当該微粉炭１１ａの廃棄処理に係るコストを削減することができる。   Therefore, according to the present embodiment, it is possible to effectively use the pulverized coal 11a and reduce the cost associated with the disposal of the pulverized coal 11a.

［第二番目の実施形態］
本発明に係る改質石炭の製造方法の第二番目の実施形態を図２に基づいて説明する。ただし、前述した第一番目の実施形態の場合と同様な部分については、前述した第一番目の実施形態の説明で用いた符号と同様な符号を用いることにより、前述した第一番目の実施形態での説明と重複する説明を省略する。 [Second Embodiment]
A second embodiment of the method for producing modified coal according to the present invention will be described with reference to FIG. However, for the same parts as in the case of the first embodiment described above, the same reference numerals as those used in the description of the first embodiment described above are used, whereby the first embodiment described above is used. The description overlapping with the description in is omitted.

本実施形態に係る改質石炭の製造方法は、図２に示すように、低質炭１１から発生する微粉炭１１ａを分離回収する第一分離回収工程Ｓ１１と、第一分離回収工程Ｓ１１を経た低質炭１１を乾燥して乾燥炭１２を得る乾燥工程Ｓ１２と、乾燥工程Ｓ１２で発生した微粉炭１２ａを分離回収する第二分離回収工程Ｓ２６と、第一分離回収工程Ｓ１１で回収された微粉炭１１ａと第二分離回収工程Ｓ２６で回収された微粉炭１２ａとを成型してプレ成型炭２３を得るプレ成型工程Ｓ２３と、乾燥炭１２及びプレ成型炭２３を乾留して乾留炭１４を得る乾留工程Ｓ１４と、乾留炭１４を成型して改質石炭１５を得る本成型工程Ｓ１５とを行うものである。   As shown in FIG. 2, the method for producing reformed coal according to the present embodiment separates and collects pulverized coal 11 a generated from the low quality coal 11, and the low quality through the first separation and recovery step S <b> 11. Drying step S12 for drying charcoal 11 to obtain dry charcoal 12, second separation and recovery step S26 for separating and recovering pulverized coal 12a generated in drying step S12, and pulverized coal 11a recovered in first separation and recovery step S11 And the pulverized coal 12a recovered in the second separation and recovery step S26 to obtain a pre-formed coal 23, and a dry-distilled step 14 to dry-dry the dry coal 12 and the pre-formed coal 23 to obtain a dry-distilled coal 14 S14 and the main molding step S15 for molding the carbonized coal 14 to obtain the modified coal 15 are performed.

前記第二分離回収工程Ｓ２６は、前記乾燥工程Ｓ１２での熱風処理により飛散した微粉炭１２ａを当該熱風から分離回収する工程であって、当該微粉炭１２ａは、上記乾燥工程Ｓ１２で乾燥処理に使用された前記熱風と共に搬出され、当該熱風が流通する排気ダクトに設けたサイクロンやフィルタ等の微粉回収手段で容易に分離回収される。   The second separation and recovery step S26 is a step of separating and collecting the pulverized coal 12a scattered by the hot air treatment in the drying step S12 from the hot air, and the pulverized coal 12a is used for the drying process in the drying step S12. The hot air is carried out and separated and collected easily by a fine powder collecting means such as a cyclone or a filter provided in an exhaust duct through which the hot air flows.

前記プレ成型工程Ｓ２３は、前記第二分離回収工程Ｓ２６で回収された前記微粉炭１２ａを、前記第一分離回収工程Ｓ１１で回収された前記微粉炭１１ａと共に圧縮することにより、粒状に成型してプレ成型炭２３（直径約数ｍｍ前後程度）とする工程であり、上記微粉炭１１ａ，１２ａを飛散等させることなく取り扱いやすくなるように加工している。   In the pre-molding step S23, the pulverized coal 12a recovered in the second separation and recovery step S26 is molded into a granular shape by compressing the pulverized coal 12a together with the pulverized coal 11a recovered in the first separation and recovery step S11. This is a step of forming pre-molded charcoal 23 (about several mm in diameter), and the pulverized charcoal 11a, 12a is processed so as to be easily handled without being scattered.

つまり、前述した実施形態においては、低質炭１１から回収された微粉炭１１ａを圧縮成型してプレ成型炭１３を得るようにしたが、本実施形態においては、低質炭１１から回収された微粉炭１１ａと、乾燥工程Ｓ１２で回収された微粉炭１２ａとを圧縮成型してプレ成型炭２３を得るようにしたのである。   That is, in the above-described embodiment, the pulverized coal 11a recovered from the low quality coal 11 is compression-molded to obtain the pre-formed coal 13. However, in this embodiment, the pulverized coal recovered from the low quality coal 11 is used. 11a and the pulverized coal 12a recovered in the drying step S12 are compression-molded to obtain the pre-formed coal 23.

したがって、本実施形態によれば、前述した実施形態の場合と同様な効果を得ることができるのはもちろんのこと、前述した実施形態よりも微粉炭１２ａの有効利用をさらに図ることができる。   Therefore, according to the present embodiment, the same effect as that of the above-described embodiment can be obtained, and more effective utilization of the pulverized coal 12a can be further achieved than the above-described embodiment.

本発明に係る改質石炭の製造方法は、原料石炭から発生した微粉炭を有効利用して、当該微粉炭の廃棄処理に係るコストを削減することができるので、産業上、極めて有益に利用することができる。   The method for producing modified coal according to the present invention can effectively use the pulverized coal generated from the raw material coal, and can reduce the cost related to the disposal of the pulverized coal. be able to.

１１ 低品位石炭（低質炭）
１１ａ 微粉炭
１２ 乾燥炭
１２ａ 微粉炭
１３，２３ プレ成型炭
１４ 乾留炭
１５ 改質石炭
Ｓ１１ 第一分離回収工程
Ｓ１２ 乾燥工程
Ｓ１３，Ｓ２３ プレ成型工程
Ｓ１４ 乾留工程
Ｓ１５ 本成型工程
Ｓ２６ 第二分離回収工程 11 Low grade coal (low quality coal)
11a pulverized coal 12 dry coal 12a pulverized coal 13,23 Pre-formed coal 14 carbonized coal 15 modified coal S11 first separation and recovery step S12 drying step S13, S23 pre-molding step S14 dry distillation step S15 main molding step S26 second separation and recovery step

Claims (3)

原料石炭から発生する微粉炭を分離回収する第一分離回収工程と、
前記第一分離回収工程を経た前記原料石炭を乾燥して乾燥炭を得る乾燥工程と、
前記第一分離回収工程で回収された前記微粉炭を成型してプレ成型炭を得るプレ成型工程と、
前記乾燥炭及び前記プレ成型炭を乾留して乾留炭を得る乾留工程と、
前記乾留炭を成型して改質石炭を得る本成型工程と
を行うことを特徴とする改質石炭の製造方法。 A first separation and recovery step for separating and recovering pulverized coal generated from raw coal;
A drying step of obtaining dry coal by drying the raw coal through the first separation and recovery step;
A pre-molding step of obtaining the pre-formed charcoal by molding the pulverized coal recovered in the first separation and recovery step;
A carbonization step of carbonizing the dry coal and the pre-formed coal to obtain a carbonized coal,
A method for producing modified coal, comprising performing the molding step of obtaining the modified coal by molding the dry distillation coal. 請求項１に記載の改質石炭の製造方法において、
前記乾燥工程で発生した微粉炭を分離回収する第二分離回収工程をさらに行うと共に、
前記プレ成型工程が、前記第二分離回収工程で回収された前記微粉炭を、前記第一分離回収工程で回収された前記微粉炭と共に成型してプレ成型炭を得る工程である
ことを特徴とする改質石炭の製造方法。 In the manufacturing method of the reformed coal according to claim 1,
While further performing a second separation and recovery step of separating and recovering the pulverized coal generated in the drying step,
The pre-molding step is a step of obtaining the pre-formed coal by molding the pulverized coal recovered in the second separation and recovery step together with the pulverized coal recovered in the first separation and recovery step. A method for producing modified coal. 請求項１又は請求項２に記載の改質石炭の製造方法において、
前記石炭が、低品位石炭である
ことを特徴とする改質石炭の製造方法。 In the manufacturing method of the modified coal of Claim 1 or Claim 2,
The said coal is low grade coal. The manufacturing method of the modified coal characterized by the above-mentioned.
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Cited By (3)

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WO2014045877A1 (en) * 2012-09-20 2014-03-27 三菱重工業株式会社 Blast furnace installation
WO2014045876A1 (en) * 2012-09-20 2014-03-27 三菱重工業株式会社 Blast furnace installation
WO2015098329A1 (en) * 2013-12-24 2015-07-02 三菱重工業株式会社 Formed coal production method

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014045877A1 (en) * 2012-09-20 2014-03-27 三菱重工業株式会社 Blast furnace installation
WO2014045876A1 (en) * 2012-09-20 2014-03-27 三菱重工業株式会社 Blast furnace installation
JP2014062279A (en) * 2012-09-20 2014-04-10 Mitsubishi Heavy Ind Ltd Blast furnace equipment
JP2014062280A (en) * 2012-09-20 2014-04-10 Mitsubishi Heavy Ind Ltd Blast furnace equipment
KR20150018634A (en) * 2012-09-20 2015-02-23 미츠비시 쥬고교 가부시키가이샤 Blast furnace installation
CN104471081A (en) * 2012-09-20 2015-03-25 三菱重工业株式会社 Blast furnace installation
KR101667166B1 (en) * 2012-09-20 2016-10-17 미츠비시 쥬고교 가부시키가이샤 Blast furnace installation
WO2015098329A1 (en) * 2013-12-24 2015-07-02 三菱重工業株式会社 Formed coal production method

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