JPH11116970A - Pretreatment of coal for coke oven and facility therefor - Google Patents
Pretreatment of coal for coke oven and facility thereforInfo
- Publication number
- JPH11116970A JPH11116970A JP27875097A JP27875097A JPH11116970A JP H11116970 A JPH11116970 A JP H11116970A JP 27875097 A JP27875097 A JP 27875097A JP 27875097 A JP27875097 A JP 27875097A JP H11116970 A JPH11116970 A JP H11116970A
- Authority
- JP
- Japan
- Prior art keywords
- coal
- pulverized coal
- coke oven
- coarse
- pulverized
- 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
Landscapes
- Solid Fuels And Fuel-Associated Substances (AREA)
- Coke Industry (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、コークス炉に装入
するコークス炉用石炭の事前処理方法および装置に関す
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for pretreating coke oven coal to be charged into a coke oven.
【０００２】[0002]
【従来の技術】コークス生産に際し、コークスの品質向
上およびコークス炉での生産性向上を目的としてコーク
ス炉装入前に装入炭を乾燥することが行われている。コ
ークス炉用石炭の付着水分は乾燥前で通常７％から１０
％程度であるが、この石炭を石炭乾燥機で付着水分０％
から６％に乾燥するものである。この乾燥した装入炭を
コークス炉まで搬送するに際し、装入炭に含まれる微粉
炭が発塵し、またコークス炉内でも装入炭の装入時及び
乾留時に発生するガスやタールにこの微粉炭が随伴する
いわゆるキャリーオーバー現象が発生する。この発塵お
よびキャリーオーバー現象を防止するため、乾燥した装
入炭を発塵しやすい粒径の微粉炭とそれより粒径の大き
い粗粒炭に分級し、この微粉炭を集塵機で集め添加剤を
加えて擬似粒子化した上でコークス炉に装入する方法が
知られている。2. Description of the Related Art In the production of coke, for the purpose of improving the quality of coke and the productivity in a coke oven, it has been practiced to dry the charged coal before charging the coke oven. The moisture content of coal for coke ovens is usually 7% to 10 before drying.
%, But this coal was dried with a coal dryer at 0%
To 6%. When the dried charged coal is transported to the coke oven, the fine coal contained in the charged coal is dusted. In the coke oven, the fine dust is added to the gas and tar generated when charging the charged coal and carbonizing. A so-called carryover phenomenon accompanied by charcoal occurs. In order to prevent this dusting and carry-over phenomenon, dry coal is classified into pulverized coal having a particle size that is easy to generate dust and coarse coal having a larger particle size. There is known a method of adding a coke oven into a coke oven after forming into pseudo particles.
【０００３】特開昭６３−７５０８９号公報には、乾燥
微粉炭をコークス炉に装入する場合、装入炭粒度分布や
分級率により装入嵩密度が低下したり制御ができなくな
ることに対して、分級粒子径を変化させ分級率を調整し
て装入炭嵩密度を高める技術について開示されている。
特開昭６２−１９２４８６号公報には、石炭の輸送中の
発塵やコークス炉に装入する際に発生ガスに同伴して副
産物であるタールに混入するキャリーオーバー微粉炭を
抑制するため、分離した微粉炭部分に添加物を加え機械
的混練操作により擬似粒子化して発塵抑制を図る技術が
開示されている。特開平４−２８５６９０号公報には、
乾燥機などに付属した集塵機で回収した微粉炭に重油、
タール油、タール滓などを粘結剤として添加して擬似粒
子を形成しようとする技術が開示されている。[0003] Japanese Patent Application Laid-Open No. 63-75089 discloses that when dry pulverized coal is charged into a coke oven, the charged bulk density is reduced or the control cannot be performed due to the charged coal particle size distribution or classification ratio. Thus, a technique is disclosed in which the classification particle diameter is changed to adjust the classification rate to increase the bulk density of the charged coal.
Japanese Patent Application Laid-Open No. 62-192486 discloses a method for separating coal in order to suppress dust generation during transportation of coal and carry-over pulverized coal mixed with tar which is a by-product accompanied by generated gas when charged into a coke oven. A technique has been disclosed in which an additive is added to the pulverized coal portion to form pseudo-particles by a mechanical kneading operation to suppress dust generation. JP-A-4-285690 discloses that
Heavy oil and pulverized coal collected by the dust collector attached to the dryer
A technique has been disclosed in which tar oil, tar slag, or the like is added as a binder to form pseudo particles.
【０００４】[0004]
【発明が解決しようとする課題】しかしながら、乾燥分
級後の微粉炭を気流と共に搬送して固気分離機に移動す
るまでの搬送路において、搬送路の内面が結露し、輸送
している微粉炭が湿気を帯びて輸送が不可能になるとい
う問題があった。また、微粉炭を回収する固気分離機に
おいても、固気分離機のバグフィルター等の内部におい
て結露が発生し、微粉炭の回収が不可能になるという問
題があった。However, in the conveyance path from the pulverized coal after the dry classification to the conveyance of the pulverized coal together with the airflow and moving to the solid-gas separator, the inner surface of the conveyance path is condensed, and the pulverized coal being conveyed. However, there has been a problem that transportation becomes impossible due to moisture. Further, also in the solid-gas separator for collecting pulverized coal, there is a problem that dew condensation occurs inside a bag filter or the like of the solid-gas separator, making it impossible to collect pulverized coal.
【０００５】分級機から固気分離機までの輸送路におい
て、輸送管内壁での結露で微粉炭が内壁に吸着しやすい
こともあり、微粉炭が輸送路の途中で堆積し、輸送路の
通路を狭くし、極端な場合には輸送路が閉塞するという
問題があった。[0005] In the transport path from the classifier to the solid-gas separator, pulverized coal may be easily adsorbed on the inner wall due to dew condensation on the inner wall of the transport pipe. In extreme cases, there is a problem in that the transportation route is blocked.
【０００６】また、従来の技術においては乾燥分級後の
微粉炭に添加物としてタール、タール滓、タール抽出物
を用いて混練、擬似粒子化した場合、これら添加物は揮
発性成分を含むことから混練及び以降の工程で強い臭気
が発生するという問題があった。さらに、粗粒炭を輸送
する途中に粗粒炭自身の熱で乾燥が進行し、水分が媒介
となって形成されていた擬似粒子であって粗粒炭として
分級されていたものが崩壊し、粗粒炭の輸送経路内にお
いて発塵源となる問題が発生していた。In the prior art, when pulverized coal after dry classification is kneaded with pulverized coal using tar, tar slag, and tar extract as additives, these additives contain volatile components. There was a problem that a strong odor was generated during kneading and subsequent steps. Further, during the transportation of the coarse coal, drying proceeds due to the heat of the coarse coal itself, and pseudo particles that have been formed mediated by moisture and have been classified as coarse coal collapse, There was a problem of a source of dust in the transportation route of coarse coal.
【０００７】[0007]
【課題を解決するための手段】本発明は、上記問題点を
解決するためになされたものであり、その要旨とすると
ころは以下の通りである。その第１は、石炭の付着水分
の一部又は全部を乾燥した後に微粉炭と粗粒炭に分級
し、該微粉炭を気流と共に搬送し、固気分離機で微粉炭
を気流から分離し、該微粉炭にタール、タール滓、ター
ル抽出物、鉱物系廃油から選ばれた１種または２種以上
の添加物を加えて混練、擬似粒子化して粗粉炭と混合し
てコークス炉に装入するコークス炉用石炭の事前処理方
法において、該微粉炭を気流と共に搬送する搬送路を保
温することを特徴とするコークス炉用石炭の事前処理方
法である。更に、微粉炭を気流から分離する固気分離機
をも保温することができる。保温は、搬送路及び固気分
離機の外周に高温水蒸気を供給して加熱することによっ
て行うことができる。その第２は、微粉炭を気流と共に
搬送する搬送路を水平面に対して傾斜させ、微粉炭の搬
送路内への堆積を防止することを特徴とする上記第１の
発明に記載のコークス炉用石炭の事前処理方法である。
該搬送路を、分級機から固気分離機までの間の形状を逆
Ｖ型とすることができる。その第３は、分級中あるいは
分級後に前記微粉炭および粗粒炭を冷却することを特徴
とする上記第１又は第２の発明に記載のコークス炉用石
炭の事前処理方法である。好ましくは、冷却後の微粉炭
及び粗粒炭の温度が６０℃以下である。SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and the gist thereof is as follows. First, after drying a part or all of the moisture adhering to the coal, the coal is classified into pulverized coal and coarse coal, the pulverized coal is conveyed together with an air stream, and the pulverized coal is separated from the air stream by a solid-gas separator, One or more additives selected from tar, tar slag, tar extract, and mineral waste oil are added to the pulverized coal, kneaded, quasi-particled, mixed with coarse coal, and charged into a coke oven. A method for pre-treating coal for a coke oven, wherein the conveying path for conveying the pulverized coal together with an air stream is kept warm. Further, a solid-gas separator for separating pulverized coal from an air stream can be kept warm. The heat retention can be performed by supplying high-temperature steam to the outer periphery of the conveying path and the solid-gas separator and heating the same. Secondly, the conveying path for conveying the pulverized coal together with the air stream is inclined with respect to the horizontal plane to prevent the pulverized coal from accumulating in the conveying path. This is a method for pre-treating coal.
The shape of the conveyance path between the classifier and the solid-gas separator can be an inverted V-shape. The third aspect is the pretreatment method for coke oven coal according to the first or second invention, wherein the pulverized coal and the coarse coal are cooled during or after classification. Preferably, the temperature of the pulverized coal and the coarse coal after cooling is 60 ° C. or less.
【０００８】その第４は、コークス炉用石炭の付着水分
の一部又は全部を乾燥する石炭乾燥機と、該乾燥した石
炭を微粉炭と粗粒炭に分級する石炭分級機と、該微粉炭
を気流と共に搬送する搬送路であって保温手段を有する
搬送路と、微粉炭を気流から分離する固気分離機と、該
微粉炭にタール、タール滓、タール抽出物、鉱物系廃油
から選ばれた１種または２種以上の添加物を加えて混
練、擬似粒子化する混練機と、該擬似粒子化した微粉炭
と粗粒炭を混合してコークス炉に装入する搬送機を有す
ることを特徴とするコークス炉用石炭の事前処理装置で
ある。微粉炭を気流から分離する固気分離機も保温手段
を有することが有効である。保温手段は、搬送路及び／
又は固気分離機の外周に高温水蒸気を供給する配管を配
してすることができる。その第５は、微粉炭を気流と共
に搬送する搬送路は水平面に対して傾斜してなることを
特徴とする上記第４の発明に記載のコークス炉用石炭の
事前処理装置である。微粉炭を気流と共に搬送する搬送
路は、分級機から固気分離機までの間の形状を逆Ｖ型と
することができる。その第６は、分級した微粉炭と粗粒
炭を冷却する微粉炭冷却機および粗粒炭冷却機を有する
ことを特徴とする上記第４又は第５の発明に記載のコー
クス炉用石炭の事前処理装置である。石炭分級機は、乾
燥した石炭を微粉炭と粗粒炭に分級すると同時に該微粉
炭と粗粒炭を冷却することができる。石炭乾燥機から排
気集塵した微粉炭を石炭分級冷却機で冷却した微粉炭と
混合することができる。分級冷却機は流動層式分級冷却
機であるとすることができる。[0008] Fourth, a coal dryer for drying part or all of the moisture adhering to the coal for a coke oven, a coal classifier for classifying the dried coal into pulverized coal and coarse coal, and a pulverized coal. A conveying path having a heat retaining means, a solid-gas separator for separating the pulverized coal from the air stream, and the pulverized coal is selected from tar, tar slag, tar extract, and mineral waste oil. A kneader for adding one or more additives and kneading the mixture to form pseudo-particles, and a conveyor for mixing the pseudo-particulated pulverized coal and coarse coal and charging the mixture into a coke oven. It is a pre-treatment device for coal for coke ovens. It is effective that a solid-gas separator for separating pulverized coal from an air stream also has a heat retaining means. The heat retaining means includes a transport path and / or
Alternatively, a pipe for supplying high-temperature steam may be provided on the outer periphery of the solid-gas separator. Fifthly, the pretreatment apparatus for a coke oven coal according to the fourth aspect of the present invention is characterized in that a conveying path for conveying the pulverized coal together with the airflow is inclined with respect to a horizontal plane. The conveying path for conveying the pulverized coal together with the air current may have an inverted V shape between the classifier and the solid-gas separator. The sixth aspect of the present invention is a method for producing a coke oven coal according to the fourth or fifth aspect, further comprising a pulverized coal cooler for cooling the classified pulverized coal and coarse coal, and a coarse coal cooler. Processing device. The coal classifier can classify the dried coal into pulverized coal and coarse coal while simultaneously cooling the pulverized coal and coarse coal. The pulverized coal exhausted and collected from the coal dryer can be mixed with the pulverized coal cooled by the coal classification cooler. The classifying cooler can be a fluidized bed classifying cooler.
【０００９】従来の第１の問題点である搬送路内あるい
は搬送路及び固気分離機内での結露については、高温の
微粉炭を伴い温度が上昇し水蒸気を含んだガスが、搬送
路内あるいは固気分離機内で温度が低下することによっ
て結露することが原因であると判明した。本発明におい
ては、搬送路内あるいは搬送路及び固気分離機内でガス
の温度が結露するまで低下しないように保温することで
この問題を解決することができる。更には微粉炭および
粗粉炭を分級後にあるいは分級と同時に冷却することに
より、搬送前にガスの温度を下げ、搬送路あるいは固気
分離機の保温すべき温度を下げることで更に良好な結果
を得ることができる。[0009] Regarding the first problem of the conventional dew condensation in the conveying path or in the conveying path and the solid-gas separator, the gas containing steam, which is accompanied by high temperature pulverized coal and whose temperature rises, is contaminated in the conveying path or in the conveying path. The cause was found to be condensation due to a decrease in temperature in the solid-gas separator. In the present invention, this problem can be solved by keeping the temperature of the gas in the transport path or in the transport path and the solid-gas separator so that the gas temperature does not decrease until dew condensation occurs. Furthermore, by cooling pulverized coal and coarse coal after or simultaneously with classification, the temperature of the gas is reduced before transport, and the temperature to be maintained in the transport path or the solid-gas separator is further reduced to obtain better results. be able to.
【００１０】従来の第２の問題点である微粉炭搬送路へ
の微粉炭の堆積については、微粉炭搬送路を水平面から
傾斜を持たせることにより、搬送路の底に堆積しようと
した微粉炭が傾斜によって落下し、分級機、固気分離
機、あるいは別途設けられた微粉炭捕獲機に捕獲するこ
とで堆積を防止することができる。[0010] Regarding the second problem of pulverized coal accumulation in the pulverized coal transport path, the pulverized coal transport path is inclined from a horizontal plane to thereby deposit pulverized coal at the bottom of the transport path. Fall down due to the inclination, and are captured by a classifier, a solid-gas separator, or a separately-installed pulverized coal capturer, whereby sedimentation can be prevented.
【００１１】従来の第３の問題点である微粉炭に添加物
を加えて混練する際の臭気については、本発明者らは、
添加物としてタール、タール滓、タール抽出物を用いた
場合、高温の微粉炭にこれら添加物を加える際に添加物
中の揮発分が蒸発することが原因であることを明らかに
した。さらに、添加物からの揮発分の蒸発を防止するた
めには、混練前の微粉炭の温度を低下させることが有効
であることを見出した。本発明においては、分級後の微
粉炭を冷却することにより、あるいは分級と同時に微粉
炭を冷却することによりこの問題を解決することができ
る。[0011] Regarding the third problem, the odor when adding and kneading an additive to pulverized coal, the present inventors have found that:
It was clarified that when tar, tar slag, and tar extract were used as additives, the volatile components in the additives were evaporated when the additives were added to the high-temperature pulverized coal. Furthermore, it has been found that it is effective to lower the temperature of pulverized coal before kneading in order to prevent evaporation of volatile components from additives. In the present invention, this problem can be solved by cooling the pulverized coal after classification or by cooling the pulverized coal simultaneously with the classification.
【００１２】従来の第４の問題点である粗粒炭の輸送経
路内における発塵については、粗粒炭を分級完了後の輸
送前に冷却しておけば、粗粒炭自身の熱による乾燥の進
行がおさえられ、発塵を防ぐことができる。[0012] Regarding the fourth problem, dust generation in the transportation path of coarse coal, if the coarse coal is cooled before the transportation after the classification is completed, the coarse coal itself is dried by heat. Progress can be suppressed and dust generation can be prevented.
【００１３】[0013]
【発明の実施の形態】石炭乾燥機としては、気流乾燥法
などの直接接触式の乾燥機であっても、またチューブ内
に熱媒または蒸気などを通したり、逆にチューブ内に石
炭を通すドラム式の間接接触式乾燥機であってもよい。
乾燥前の石炭の付着水分は通常７％から１０％である
が、乾燥機を通すことによって付着水分を５％前後に低
減する。乾燥は石炭を高温に熱することによって行うの
で、乾燥後の石炭は通常６０℃以上の温度となってい
る。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As a coal dryer, a direct contact dryer such as a flash drying method can be used. Alternatively, a heating medium or steam can be passed through a tube, or a coal can be passed through a tube. It may be a drum-type indirect contact dryer.
The adhesion moisture of the coal before drying is usually 7% to 10%, but the adhesion moisture is reduced to about 5% by passing through a dryer. Since the drying is performed by heating the coal to a high temperature, the dried coal is usually at a temperature of 60 ° C. or higher.
【００１４】乾燥後の石炭を粗粒炭と微粉炭に分級し、
さらに上述のように粗粒炭と微粉炭の双方を冷却するこ
とが好ましい。冷却する手段として、分級と冷却を別々
に行ってもよいし、分級と冷却を同時に行ってもよい。[0014] The dried coal is classified into coarse coal and pulverized coal,
Further, it is preferable to cool both the coarse coal and the fine coal as described above. As means for cooling, classification and cooling may be performed separately, or classification and cooling may be performed simultaneously.
【００１５】分級と冷却を別々に行う場合のフロー図を
図１に示す。石炭分級機として平板回転遠心式のスター
テバンド分級機が代表的であり、また冷却手段として粗
粒炭と微粉炭の双方を低温ガスと接触することが有効で
ある。具体的には、粗粒炭冷却機および微粉炭冷却機と
してそれぞれに別個に石炭と気体の固気接触装置を設け
る。固気接触装置としては、伝熱装置として機能するこ
とが必要で、直接接触式のピン付きローター回転型攪拌
機または気流旋回式円筒型攪拌機、流動層または攪拌機
能付き流動層等の、石炭と気体との接触時間を長く確保
できるものであることが望ましい。固気接触装置の中
に、石炭乾燥機から出た水分５％前後の石炭と、低温か
つ低湿分の気体とを導入する。主目的は石炭の低温化で
あるから、５０℃以下のガスであることが望ましく、さ
らに、高湿分ガスの場合には石炭粒子の間隙に入り込ん
だガス中湿分が温度低下により凝縮する可能性があるた
め、常温でも飽和湿度にならない程度の低湿分ガスが望
ましい。工業的には大気を用いることも有効である。FIG. 1 is a flow chart in the case where classification and cooling are performed separately. As a coal classifier, a flat plate rotary centrifugal type starter band classifier is typical, and it is effective to contact both coarse coal and fine coal with a low-temperature gas as a cooling means. More specifically, a coal-gas solid-gas contact device is separately provided as a coarse coal cooler and a fine coal cooler. As a solid-gas contact device, it is necessary to function as a heat transfer device. Coal and gas, such as a direct contact type rotor-rotating stirrer with pins or an air-flow swirling cylindrical stirrer, a fluidized bed or a fluidized bed with a stirring function, etc. It is desirable to be able to secure a long contact time with the substrate. Coal with a moisture content of about 5% and a low-temperature and low-humidity gas discharged from the coal dryer are introduced into the solid-gas contact device. Since the main purpose is to lower the temperature of coal, it is desirable to use a gas at a temperature of 50 ° C or less. In the case of a highly humid gas, the moisture in the gas that has entered the gaps between the coal particles can be condensed due to the temperature drop. Therefore, a low-humidity gas that does not reach saturation humidity even at room temperature is desirable. It is also effective to use the atmosphere industrially.
【００１６】分級と冷却を同時に行う場合のフロー図を
図２に示す。分級と冷却を同時に行う手段として、気流
分級法を採用し、分級に用いる気体として低温低湿分ガ
スを用いることが可能である。１ｍｍ未満の石炭粒子を
大量に扱うコークス炉用石炭の場合、気流分級法は好適
であり、設備のコンパクト化、設備費の削減や敷地面積
の縮小などに有効である。分級に用いる気体として低温
かつ低湿分という条件を満足するものとして常温の空気
を用いることができる。常温の空気は、ハンドリングの
容易さ、設備の簡易化など多くの利点がある。FIG. 2 is a flow chart in the case where classification and cooling are performed simultaneously. As means for simultaneously performing classification and cooling, an airflow classification method is adopted, and a low-temperature low-humidity gas can be used as a gas used for classification. In the case of coke oven coal handling a large amount of coal particles of less than 1 mm, the air flow classification method is suitable and is effective for downsizing equipment, reducing equipment costs, reducing site area, and the like. Room temperature air can be used as a gas used for classification that satisfies the condition of low temperature and low humidity. Room temperature air has many advantages, such as ease of handling and simplification of equipment.
【００１７】微粉炭を気流と共に搬送する搬送路の保温
は、単に輸送管の外周を断熱材で取り囲み、気流の熱が
外部に逃げることを遮断するだけでも効果があるが、よ
り有効には輸送管の外周に加熱手段を設けて積極的に搬
送路を加熱する。これによって搬送路内での結露を完全
に防止できると共に、操業開始時に搬送路が冷えている
場合でも、加熱によって搬送路を気流温度まで上昇させ
ることが可能になる。加熱手段としては、輸送管の外周
に高温水蒸気を通すパイプを配設するスチームトレスを
採用することが最も好ましい。パイプ内を通過する水蒸
気の温度は１３０℃〜１８０℃であり、水蒸気の通過量
の調整によって輸送管内部の温度を調整することができ
る。加熱手段としては、このほかに電気加熱法を採用す
ることもできる。In order to keep the heat of the transport path for transporting the pulverized coal together with the airflow, it is effective to simply surround the outer periphery of the transport pipe with a heat insulating material and to prevent the heat of the airflow from escaping to the outside. A heating means is provided on the outer periphery of the tube to positively heat the transfer path. This makes it possible to completely prevent dew condensation in the transport path, and even if the transport path is cold at the start of operation, it is possible to raise the transport path to the airflow temperature by heating. As the heating means, it is most preferable to employ a steam tress in which a pipe for passing high-temperature steam is provided on the outer periphery of the transport pipe. The temperature of the steam passing through the pipe is 130 ° C. to 180 ° C., and the temperature inside the transport pipe can be adjusted by adjusting the amount of passing steam. As the heating means, an electric heating method can be used in addition to the above.
【００１８】搬送路の断熱あるいは加熱による保温を行
い、搬送中の気流温度及び輸送管内壁温度の低下を防止
する。気流温度は一定に保つ必要はなく、結露が発生し
ない温度以上に保たれればいい。搬送路の結露によって
実質的に問題が発生するのは、気流温度あるいは輸送管
内壁温度が露点よりさらに３℃低い温度以下となった場
合である。従って、搬送路の保温は、気流温度及び輸送
管内壁温度が露点−３℃よりも高い温度を保つように調
整する。The transfer path is insulated or kept warm by heating to prevent lowering of the air flow temperature during transfer and the temperature of the inner wall of the transport pipe. It is not necessary to keep the airflow temperature constant, but it is only necessary to keep it at a temperature above which dew condensation does not occur. The problem occurs substantially due to the condensation on the transport path when the airflow temperature or the inner wall temperature of the transport pipe becomes lower than or equal to 3 ° C. lower than the dew point. Therefore, the heat retention of the transport path is adjusted so that the airflow temperature and the inner wall temperature of the transport pipe maintain a temperature higher than the dew point of −3 ° C.
【００１９】本発明で固気分離機を保温する場合も、考
え方は搬送路を保温する場合と同じである。固気分離機
としてはバグフィルターの利用が最も一般的である。バ
グ（濾布）を収納したバグハウス（バグフィルター周囲
の鉄皮）の外周を、断熱材で覆って断熱するか、あるい
はスチームトレス等の加熱手段を採用して積極的に加熱
する。保温の程度は、搬送路と同じく、固気分離機内の
気流の温度を露点−３℃よりも高い温度に保つように調
整することで、固気分離機内での結露を防止することが
できる。The concept of maintaining the temperature of the solid-gas separator according to the present invention is the same as that of maintaining the transport path. A bag filter is most commonly used as a solid-gas separator. The outer periphery of the bag house (iron skin around the bag filter) in which the bag (filter cloth) is housed is covered with a heat insulating material to insulate the heat, or a heating means such as steam tress is used to actively heat the bag. As in the case of the transport path, the degree of heat retention is adjusted so that the temperature of the airflow in the solid-gas separator is maintained at a temperature higher than the dew point of −3 ° C., so that dew condensation in the solid-gas separator can be prevented.
【００２０】微粉炭を気流と共に搬送する搬送路は、た
とえ結露がない場合であっても、パイプの底に微粉炭が
堆積しやすい。結露があればなおのことである。気流の
流速を増大して微粉炭の堆積を防止することも可能であ
るが、微粉炭の搬送量が多くなり、パイプの内径が太い
ので、膨大な量のガス量を必要とし、実用的ではない。
本発明においては、搬送路を水平面に対して傾斜させる
ことでこの問題を解決した。通常、分級機と固気分離機
は同一水平面の地表上の架構上に立設する。また、分級
機と固気分離機を同一架構の上下に配設することは建設
費の高騰を招く。従って、搬送路を水平面に対して傾斜
させるにおいて、分級機から搬送路を上方に向けて傾斜
させ、搬送路の中間地点で逆に搬送路を下方に向けて傾
斜させ固気分離機に到達する、いわゆる逆Ｖ型の経路を
設けるのが適当である。逆Ｖ型経路の内の変形として、
上行管あるいは下行管のいずれかを垂直に立設すること
も可能である。また、上行管あるいは下行管は、傾斜を
有する部分と垂直な部分とを併せ持った形状としてもよ
い。In a conveying path for conveying pulverized coal together with an airflow, pulverized coal is liable to accumulate on the bottom of a pipe even if there is no condensation. This is especially true if there is condensation. It is possible to prevent pulverized coal from accumulating by increasing the airflow velocity, but the amount of pulverized coal transported is large and the inside diameter of the pipe is large, so a huge amount of gas is required. Absent.
In the present invention, this problem has been solved by inclining the transport path with respect to the horizontal plane. Usually, the classifier and the solid-gas separator are erected on a frame on the same horizontal surface. Further, arranging the classifier and the solid-gas separator above and below the same frame causes a rise in construction costs. Therefore, when the conveying path is inclined with respect to the horizontal plane, the conveying path is inclined upward from the classifier, and the conveying path is inclined downward at the middle point of the conveying path to reach the solid-gas separator. It is appropriate to provide a so-called inverted V-shaped path. As a variant of the inverted V path,
Either the ascending pipe or the descending pipe can be set up vertically. Further, the ascending tube or the descending tube may have a shape having both an inclined portion and a vertical portion.
【００２１】搬送路の傾斜角度は、沈降した微粉炭が堆
積せずに滑り落ちるための十分な角度が必要である。本
微粉炭搬送路においては、水平に対する傾斜角度を６０
°以上とすることが適当である。傾斜の最下端では滑り
落ちてきた微粉炭を分級機、固気分離機、あるいは別途
設けた微粉炭を回収するための装置によって回収する。The inclination angle of the conveying path needs to be a sufficient angle for the sedimented pulverized coal to slide down without accumulating. In this pulverized coal conveyance path, the inclination angle with respect to the horizontal
° or more is appropriate. At the lowermost end of the slope, the pulverized coal that has slid down is collected by a classifier, a solid-gas separator, or a separately provided device for collecting pulverized coal.
【００２２】搬送路及び固気分離機内での結露を防ぐた
めに、本発明では上述のように搬送路更に必要な場合固
気分離機を保温することで気流の温度降下を防止する。
しかし、搬送路入口のガスの温度が高いと、保温のため
の設備はこの高い温度を維持するために設備費もランニ
ングコストも高価なものとなる。この問題を解決するた
め、本発明では搬送路に入る前の石炭の冷却分級機で微
粉炭を冷却することができる。もちろん、冷却によって
ガス温度が露点以下となり、結露したのでは冷却の意味
がない。従って、冷却は、乾燥した低温のガスを大量に
送り込むことによって行われる。好ましい実施の形態と
しては、微粉炭と粗粒炭の分級冷却機を流動層式分級冷
却機とし、該分級冷却機に送り込むガスを低温で乾燥し
たガスとすることでこの目的を達することができる。In order to prevent dew condensation in the conveying path and the solid-gas separator, the present invention prevents the temperature drop of the air flow by keeping the conveying path and the solid-gas separator warm if necessary, as described above.
However, if the temperature of the gas at the entrance of the transport path is high, the equipment for keeping the temperature high requires high equipment cost and running cost in order to maintain this high temperature. In order to solve this problem, in the present invention, pulverized coal can be cooled by a coal cooling classifier before entering the transport path. Of course, the cooling causes the gas temperature to fall below the dew point, and condensing has no meaning in cooling. Thus, cooling is provided by injecting a large amount of dry, cold gas. In a preferred embodiment, this purpose can be achieved by using a fluidized bed type classifying cooler as a classifying cooler for pulverized coal and coarse-grained coal, and using a low-temperature and dry gas as a gas fed to the classifying cooler. .
【００２３】微粉炭を冷却することにより、従来の技術
の第３の問題点である、微粉炭に添加物を加えて混練す
る際の臭気についても解決することができる。By cooling the pulverized coal, it is possible to solve the third problem of the prior art, that is, the odor when adding and kneading additives to the pulverized coal.
【００２４】微粉炭、粗粒炭ともに冷却後の温度を６０
℃以下とすれば本発明の目的を達成することができる。
ここで、微粉炭の温度は気流と共に搬送路へ流入する時
点での温度をいい、粗粒炭温度は、粗粒炭搬送機へ搬出
される時点での温度をいう。微粉炭の温度を６０℃以下
としたのは、微粉炭の混練機においては、７０℃程度に
熱したタールなどを微粉炭と混合して混練を行うが、微
粉炭の温度が６０℃を超えていると、タールと微粉炭が
接触したときにタール中の揮発分の蒸発が進行し、これ
が強い臭気の原因となるからである。微粉炭の温度を６
０℃以下とすることによって、この臭気の原因となる揮
発分の蒸発をおさえることができる。粗粒炭の冷却後の
温度を６０℃以下としたのは、６０℃を超える温度では
石炭輸送工程での水蒸気発生が継続しており、水分によ
って擬似粒子化して粗粒炭側に分級された微粉炭擬似粒
子が水蒸気蒸発によって崩壊し、発塵の原因となり、同
時に粗粒炭搬送機の排気集塵機での蒸発水分の結露の原
因ともなるからである。The temperature after cooling both pulverized coal and coarse coal is 60
If the temperature is lower than or equal to ° C., the object of the present invention can be achieved.
Here, the temperature of the pulverized coal refers to the temperature at the time of flowing into the transport path together with the airflow, and the temperature of the coarse coal refers to the temperature at the time of being transported to the coarse coal transporter. The reason why the temperature of the pulverized coal is set to 60 ° C. or less is that, in a pulverized coal kneader, tar or the like heated to about 70 ° C. is mixed with the pulverized coal and kneaded, but the temperature of the pulverized coal exceeds 60 ° C. In this case, when the tar and the pulverized coal come into contact with each other, the evaporation of volatiles in the tar proceeds, which causes a strong odor. The temperature of pulverized coal is 6
By controlling the temperature to 0 ° C. or lower, evaporation of volatile components causing the odor can be suppressed. The reason why the temperature after cooling of the coarse coal was set to 60 ° C. or less was that steam generation in the coal transportation process continued at a temperature exceeding 60 ° C. This is because the pulverized coal pseudo-particles are disintegrated by steam evaporation and cause dust generation, and at the same time, cause condensation of evaporated water in the exhaust dust collector of the coarse coal carrier.
【００２５】微粉炭の冷却に関しては、臭気を防止する
ためには常温まで温度を下げることが望ましいが、ター
ルは温度低下と共に急激に粘度が上昇する。特に微粉炭
を３０℃前後まで低温化すると、石炭粒子とタールを混
練する際に、タールミストが石炭粒子に接触した瞬間に
タールの温度が下がり、タールが石炭粒子表面に薄く拡
散して粒子数の多い微細粒子同士を粘着させる効果が少
なくなる。特に１００μｍ未満の石炭微粒子を捕捉して
擬似粒子化させることを期待しているにもかかわらず、
擬似粒子化できない微細粒子数が増えるので要注意であ
る。As for the cooling of pulverized coal, it is desirable to lower the temperature to normal temperature in order to prevent odor, but the viscosity of tar increases sharply with the temperature drop. In particular, when the temperature of the pulverized coal is lowered to about 30 ° C., the temperature of the tar drops when the tar mist comes into contact with the coal particles when the coal particles and the tar are kneaded, and the tar diffuses thinly on the surface of the coal particles to reduce the number of particles. The effect of adhering fine particles having a large amount to each other is reduced. In spite of expecting to capture coal fine particles of less than 100 μm and turn them into pseudo particles,
It is necessary to be careful because the number of fine particles that cannot be converted into pseudo particles increases.
【００２６】石炭乾燥機によっては、乾燥機からの排ガ
スに微粉炭が含まれ、その微粉炭を集塵する場合があ
る。乾燥機からの排ガスに含まれる微粉炭は６０℃以上
の温度を有しているが、その量は分級冷却機にて分級冷
却される微粉炭の量に比較して微量であるため、図３に
示すように分級冷却後の微粉炭にこの乾燥機からの微粉
炭を混合しても混合後の温度を十分に下げることは可能
である。In some coal dryers, pulverized coal is contained in the exhaust gas from the dryer, and the pulverized coal may be collected. Although the pulverized coal contained in the exhaust gas from the dryer has a temperature of 60 ° C. or higher, the amount is small compared to the amount of the pulverized coal classified and cooled by the classification cooler. As shown in (1), even if the pulverized coal from the dryer is mixed with the pulverized coal after classification and cooling, it is possible to sufficiently lower the temperature after mixing.
【００２７】以上の操作により分級冷却を行った後、微
粉炭に添加物を加えて混練、擬似粒子化する。添加物と
しては、タール、タール滓、タール抽出物、鉱物系廃油
が好ましい。After classifying and cooling by the above operation, additives are added to the pulverized coal and kneaded to form pseudo-particles. As the additive, tar, tar slag, tar extract, and mineral waste oil are preferable.
【００２８】擬似粒子化した微粉炭は、コークス炉への
輸送の途中で粗粒炭と混合し、コークス炉に装入する。The quasi-particled pulverized coal is mixed with coarse coal during the transportation to the coke oven and charged into the coke oven.
【００２９】分級粒子径は原料炭の粒度分布により変化
するが、粗粒炭の発塵防止の観点では１００μｍを分級
点とするのが望ましく、キャリーオーバー抑制の観点か
らは微粉炭の粒径を維持するため２００〜３００μｍを
分級点とすることが望ましい。これにより、本発明の効
果を享受するとともに、コークス炉での充填密度の制
御、コークス品質の安定や石炭温度低減過程での水分蒸
発など、二次的効果も享受できる場合がある。Although the classification particle size varies depending on the particle size distribution of the raw coal, it is preferable to set the classification point to 100 μm from the viewpoint of preventing dusting of the coarse coal, and to reduce the particle size of the pulverized coal from the viewpoint of suppressing carryover. It is desirable that the classification point be 200 to 300 μm in order to maintain. Thereby, in addition to enjoying the effects of the present invention, secondary effects such as control of the packing density in the coke oven, stability of coke quality, and evaporation of water in the process of reducing coal temperature may be enjoyed in some cases.
【００３０】[0030]
（実施例１）図１に本発明の実施例１のフロー図を示
す。石炭乾燥機１は、蒸気内管式回転乾燥機であり、乾
燥前の湿炭水分が７％から１１％の場合において水分５
％まで乾燥することができる。１５０℃の蒸気を用い、
ドラム内の石炭滞留時間９０秒で、湿炭水分１０％の原
料を用い、乾燥後石炭水分は５％、石炭温度は平均で７
８℃となつた。(Embodiment 1) FIG. 1 shows a flowchart of Embodiment 1 of the present invention. The coal dryer 1 is a steam-in-tube rotary dryer, and when the wet coal moisture before drying is 7% to 11%, the moisture is 5%.
% Can be dried. Using steam at 150 ° C,
Coal residence time in the drum is 90 seconds, and raw materials having 10% moisture of coal are used. After drying, the moisture of coal is 5%, and the average coal temperature is 7%.
The temperature reached 8 ° C.
【００３１】石炭分級機２として平板回転遠心式のスタ
ーテバント分級機を採用した。分級点は１００μｍにて
行ったところ、微粉炭側の分級率は１０％となった。分
級した微粉炭および粗粒炭の双方をそれぞれ別個に冷却
すべく、粗粒炭冷却機３、微粉炭冷却機４として石炭と
ガスの固気接触装置を設けた。固気接触装置としては十
字流接触式熱交換機を用いたが、各々１００ｔ／ｈの能
力とした。固気接触装置出口において粗粒炭の温度は４
０℃まで、微粉炭の温度は３５℃まで低下できた。As the coal classifier 2, a plate rotating centrifugal startervant classifier was employed. When the classification point was 100 μm, the classification ratio on the pulverized coal side was 10%. In order to cool both the classified pulverized coal and the coarse coal separately, a solid-gas contact device for coal and gas was provided as the coarse coal cooler 3 and the fine coal cooler 4. Cross-flow contact heat exchangers were used as the solid-gas contact devices, each having a capacity of 100 t / h. The temperature of the coarse coal at the outlet of the solid-gas contact device is 4
To 0 ° C., the temperature of the pulverized coal could be reduced to 35 ° C.
【００３２】この微粉炭を固気分離機６まで搬送する搬
送路１３は、直径１０００ｍｍφの鋼管であり、長さ延
長は２５ｍである。搬送には微粉炭冷却機で用いた冷却
用の空気に新たに搬送用の空気を付加し、合計で３００
０ｍ3 ／ｍｉｎの流量とした。この鋼管の外周にスチー
ムトレスを施して内部を通過する微粉炭と気流を保温し
た。搬送路の鋼管の周囲に４００ｍｍ〜６００ｍｍの間
隔で水蒸気パイプを捲きまわし、水蒸気パイプの総延長
長さは２６０ｍであり、１６０℃の水蒸気を２ｍ3 ／ｍ
ｉｎ流すことで、搬送路入口で４５℃だった気流の温度
を出口において４１℃に保持した。気流の露点は３９℃
であったので、搬送路１３内での結露は発生しなかっ
た。The conveying path 13 for conveying the pulverized coal to the solid-gas separator 6 is a steel pipe having a diameter of 1000 mmφ and has a length of 25 m. For transport, a new transport air is added to the cooling air used in the pulverized coal cooler, for a total of 300
The flow rate was 0 m 3 / min. A steam tress was applied to the outer periphery of the steel pipe to keep the pulverized coal and the airflow passing through the inside warm. A steam pipe is wound around the steel pipe in the conveying path at an interval of 400 mm to 600 mm. The total length of the steam pipe is 260 m, and steam at 160 ° C. is 2 m 3 / m.
By flowing in, the temperature of the airflow that was 45 ° C. at the entrance of the transport path was maintained at 41 ° C. at the exit. Air flow dew point is 39 ℃
Therefore, dew condensation in the transport path 13 did not occur.
【００３３】本実施例では搬送路１３を水平面に対して
平行に設置したため、搬送路内への微粉炭の堆積を完全
には防止できなかった。しかし、搬送路内での結露を防
止しているため、従来に比較すると微粉炭の堆積は非常
に低減し、従来は操業３日に１回の搬送路内の清掃が必
要であったものが、操業３０日に１回の搬送路内の清掃
を行うことで十分であった。In this embodiment, since the transport path 13 is installed in parallel with the horizontal plane, the accumulation of pulverized coal in the transport path cannot be completely prevented. However, since dew condensation in the transport path is prevented, the accumulation of pulverized coal is greatly reduced as compared with the conventional method, and in the past, it was necessary to clean the transport path once every three days of operation. It was sufficient to clean the inside of the transport path once every 30 days of operation.
【００３４】固気分離機６としてはバグフィルターを用
い、固気分離機６の外周も搬送路１３と同様に保温し
た。合計１．５ｍ3 ／ｍｉｎの水蒸気を用いることで、
固気分離機内での気流の結露を防止することができた。
固気分離機６の外周を保温しなかった場合、保温した本
実施例に比較して若干の結露の発生はあるが、固気分離
機手前の搬送路１３を保温しているために固気分離機入
口でのガス温度が高く、従来に比較すると結露の発生は
大幅に低減する。A bag filter was used as the solid-gas separator 6, and the outer periphery of the solid-gas separator 6 was kept warm in the same manner as the transport path 13. By using a total of 1.5 m 3 / min steam,
The dew condensation of the airflow in the solid-gas separator was prevented.
In the case where the outer periphery of the solid-gas separator 6 was not kept warm, some dew condensation occurred as compared with the present embodiment in which the temperature was kept constant. The gas temperature at the inlet of the separator is high, and the occurrence of dew condensation is greatly reduced as compared with the conventional case.
【００３５】固気分離機６で微粉炭と気流を分離し、微
粉炭を混練機７で７０℃に加熱したタールと混練し、擬
似粒子化した。ここでは、ピン式混練機を用いたが、５
０μｍ以上の均一な擬似粒子を形成することができた。
これを分級した粗粒炭の搬送機８のコンベアに合流さ
せ、コークス炉１０に搬送する方法を採用した。The pulverized coal and the gas stream were separated by a solid-gas separator 6, and the pulverized coal was kneaded with a tar heated to 70 ° C. in a kneader 7 to form pseudo particles. Here, a pin-type kneader was used.
Uniform pseudo-particles of 0 μm or more could be formed.
This was combined with the conveyor of the conveyor 8 for the classified coarse coal and conveyed to the coke oven 10.
【００３６】本実施例では、分級機出口にて測定した粗
粒炭および微粉炭の粒度分布が、輸送中にも変化が少な
く、輸送過程で粗粒炭に付着している擬似粒子が崩壊し
た挙動は観察されなかった。輸送工程での水分蒸発も少
なく、また粘結剤として添加したタールの臭気も弱く良
好な運転をすることができた。In this embodiment, the particle size distribution of the coarse coal and pulverized coal measured at the outlet of the classifier has little change during transportation, and the pseudo particles adhering to the coarse coal during the transportation process collapsed. No behavior was observed. The evaporation of water in the transportation process was small, and the odor of tar added as a binder was weak, so that good operation was possible.
【００３７】（実施例２）図２に本発明の実施例２のフ
ロー図を示す。実施例１における石炭分級機２と冷却機
３、４のかわりに、石炭分級冷却機５として気流分級法
の一種である流動層式分級機を採用した。流動層式分級
機の入口ガスとして常温（約２０℃）の空気を導入し
た。流動層式分級機に投入された石炭のうち、微粉炭は
冷却ガスの排気と共に上部ガスダクトから気流に同伴し
て排出し、残った粗粒炭は石炭投入口と反対方向に設け
られた排出口から排出した。分級は１００μｍを基準に
行ったが、この調整は分級部でのガス流速の調整で行っ
た。この結果、分級前の石炭の水分は５％、温度は７５
℃であったが、分級冷却機出口においては水分は３．８
％、微粉炭の分級率は約１５％であり、温度が微粉炭は
３５℃、粗粒炭は３９℃となった。(Embodiment 2) FIG. 2 shows a flowchart of Embodiment 2 of the present invention. Instead of the coal classifier 2 and the coolers 3 and 4 in the first embodiment, a fluidized bed classifier, which is a kind of airflow classification method, was adopted as the coal classifier 5. Air at normal temperature (about 20 ° C.) was introduced as the inlet gas of the fluidized bed classifier. Of the coal charged into the fluidized bed classifier, pulverized coal is discharged from the upper gas duct together with the airflow along with the exhaust of the cooling gas, and the remaining coarse coal is discharged at the outlet opposite to the coal inlet. Discharged from. The classification was performed on the basis of 100 μm, and this adjustment was performed by adjusting the gas flow rate in the classification section. As a result, the moisture of the coal before classification was 5%, and the temperature was 75%.
° C, but the water content was 3.8 at the outlet of the classifying cooler.
%, The classification rate of pulverized coal was about 15%, and the temperature was 35 ° C. for pulverized coal and 39 ° C. for coarse coal.
【００３８】この微粉炭を固気分離機６まで搬送する搬
送路１３は、直径１１００ｍｍφの鋼管であり、長さ延
長は３０ｍである。図４に示すように、本実施例では搬
送路１３を水平面に対して６０°の傾斜を有する配置と
し、全体で逆Ｖ型の形状とした。搬送路内で沈降した微
粉炭はこの傾斜によってすべて搬送路入口と出口部分に
滑り落ち、石炭分級冷却機５と固気分離機６に回収され
るので、搬送路内の清掃は全く必要なかった。The conveying path 13 for conveying the pulverized coal to the solid-gas separator 6 is a steel pipe having a diameter of 1100 mmφ and has a length of 30 m. As shown in FIG. 4, in the present embodiment, the transport path 13 is arranged so as to be inclined at an angle of 60 ° with respect to the horizontal plane, and has an inverted V shape as a whole. All the pulverized coal settled in the transport path slides down to the entrance and the exit of the transport path due to this inclination, and is collected in the coal classifying cooler 5 and the solid-gas separator 6, so that cleaning of the transport path was not required at all. .
【００３９】搬送には微粉炭冷却機で用いた分級冷却用
の空気をそのまま用い、２０００ｍ3 ／ｍｉｎの流量と
した。この鋼管の外周にスチームトレスを施して内部を
通過する微粉炭と気流を保温した。搬送路の鋼管の周囲
に４００ｍｍ〜６００ｍｍの間隔で水蒸気パイプを捲き
まわし、水蒸気パイプの総延長長さは３５０ｍであっ
た。このスチームトレスに１６０℃の水蒸気を２．５ｍ
3 ／ｍｉｎ流すことで、搬送路入口で４１℃だった気流
の温度を出口において３８℃に保持した。気流の露点は
４０℃であったので、搬送路内での結露は発生しなかっ
た。The air for classification and cooling used in the pulverized coal cooler was used as it was, and the flow rate was 2000 m 3 / min. A steam tress was applied to the outer periphery of the steel pipe to keep the pulverized coal and the airflow passing through the inside warm. A steam pipe was wound around the steel pipe in the conveyance path at an interval of 400 mm to 600 mm, and the total length of the steam pipe was 350 m. 2.5 m of steam at 160 ° C.
By flowing at a flow rate of 3 / min, the temperature of the airflow, which was 41 ° C. at the entrance of the conveyance path, was maintained at 38 ° C. at the exit. Since the dew point of the airflow was 40 ° C., no dew condensation occurred in the transport path.
【００４０】固気分離機６としてはバグフィルターを用
い、固気分離機６の外周も搬送路１３と同様に保温し
た。合計２．０ｍ3 ／ｍｉｎの水蒸気を用いることで、
固気分離機内での気流の結露を防止することができた。A bag filter was used as the solid-gas separator 6, and the outer periphery of the solid-gas separator 6 was kept warm in the same manner as the transport path 13. By using a total of 2.0 m 3 / min steam,
The dew condensation of the airflow in the solid-gas separator was prevented.
【００４１】固気分離機６で微粉炭と気流を分離し、こ
の微粉炭を混練機７において６０℃に加熱したタールと
混練し、擬似粒子化した。ここではパドル式混練機を用
いたが、８０μｍ以上の均一な擬似粒子を形成すること
ができた。これを分級機にて分離した粗粒炭の搬送機８
のコンベアに合流し、コークス炉１０に輸送する方法を
採用した。The pulverized coal and the gas stream were separated by a solid-gas separator 6, and the pulverized coal was kneaded with a tar heated to 60 ° C. in a kneader 7 to form pseudo particles. Here, a paddle type kneader was used, but uniform pseudo particles having a size of 80 μm or more could be formed. This is separated by a classifier and is used to transport coarse coal 8
And transported to the coke oven 10.
【００４２】本実施例では、分級冷却機５出口にて測定
した粗粒炭および微粉炭の粒度分布が、輸送中にも変化
が少なく、輸送過程で粗粒炭に付着している擬似粒子が
崩壊せず、輸送工程での水分蒸発も少なく、また粘結剤
として添加したタールの臭気も弱く良好な運転をするこ
とができた。コークス炉においても、キャリーオーバー
が抑制でき、また装入石炭の水分が低減しコークス品質
も向上する効果を享受した。In this embodiment, the particle size distribution of the coarse coal and pulverized coal measured at the outlet of the classifying cooler 5 shows little change during transportation, and pseudo particles adhering to the coarse coal during the transportation process are reduced. It did not disintegrate, there was little evaporation of water in the transporting step, and the odor of tar added as a binder was weak and good operation was possible. Also in the coke oven, carry-over was suppressed, and the effect of reducing the moisture of the charged coal and improving the coke quality was enjoyed.
【００４３】[0043]
【発明の効果】コークス炉用石炭の事前処理において、
石炭を乾燥後分級した微粉炭の搬送路及び固気分離装置
を保温し、該搬送路に傾斜を持たせて設置し、分級中あ
るいは分級後に微粉炭および粗粒炭を冷却することによ
り、搬送路及び固気分離機における結露を防止でき、搬
送路における微粉炭の堆積を防止でき、微粉炭に添加物
を加えて混練、擬似粒子化する際の臭気の発生を防止す
ることができ、さらに粗粒炭の輸送過程での発塵を防止
することができた。In the pretreatment of coal for a coke oven,
The conveying path of the pulverized coal obtained by drying and classifying the coal and the solid-gas separation device are kept warm, and the conveying path is installed with an inclination, and the pulverized coal and the coarse coal are cooled during or after the classification to convey the coal. Can prevent dew condensation in the passage and the solid-gas separator, can prevent the accumulation of pulverized coal in the transport path, can add additives to the pulverized coal, knead it, can prevent the generation of odor when forming pseudo-particles, and It was possible to prevent dust generation during the transportation of coarse coal.
【図１】本発明の１実施例を示すフロー図である。FIG. 1 is a flowchart showing one embodiment of the present invention.
【図２】本発明の１実施例を示すフロー図である。FIG. 2 is a flowchart showing one embodiment of the present invention.
【図３】本発明の１実施例を示すフロー図である。FIG. 3 is a flowchart showing one embodiment of the present invention.
【図４】本発明の傾斜を有する搬送路を示す概略図であ
る。FIG. 4 is a schematic view showing a conveying path having an inclination according to the present invention.
１ 石炭乾燥機 ２ 石炭分級機 ３ 粗粒炭冷却機 ４ 微粉炭冷却機 ５ 石炭分級冷却機 ６ 固気分離機 ７ 混練機 ８ 粗粒炭搬送機 ９ 擬似粒子搬送機 １０ コークス炉 １１ 粗粒炭 １２ 微粉炭 １３ 搬送路 １４ 集塵機 １５ 微粉炭ホッパー １６ 排気ブロアー １７ 排気筒 REFERENCE SIGNS LIST 1 coal dryer 2 coal classifier 3 coarse coal cooler 4 pulverized coal cooler 5 coal classification cooler 6 solid-gas separator 7 kneader 8 coarse coal transporter 9 pseudo-particle transporter 10 coke oven 11 coarse coal 12 Pulverized coal 13 Conveying path 14 Dust collector 15 Pulverized coal hopper 16 Exhaust blower 17 Exhaust cylinder
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.6 識別記号 ＦＩ Ｃ１０Ｌ 9/00 Ｃ１０Ｌ 9/00 (72)発明者 紫原 康孝 富津市新富20−１ 新日本製鐵株式会社技 術開発本部内──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. 6 Identification code FI C10L 9/00 C10L 9/00 (72) Inventor Yasutaka Murasaki 20-1 Shintomi, Futtsu City Nippon Steel Corporation Technology Development Division
Claims (16)
た後に微粉炭と粗粒炭に分級し、該微粉炭を気流と共に
搬送し、固気分離機で微粉炭を気流から分離し、該微粉
炭にタール、タール滓、タール抽出物、鉱物系廃油から
選ばれた１種または２種以上の添加物を加えて混練、擬
似粒子化して粗粉炭と混合してコークス炉に装入するコ
ークス炉用石炭の事前処理方法において、該微粉炭を気
流と共に搬送する搬送路を保温することを特徴とするコ
ークス炉用石炭の事前処理方法。After drying a part or all of the moisture adhering to the coal, the coal is classified into pulverized coal and coarse coal, the pulverized coal is conveyed together with an air stream, and the pulverized coal is separated from the air stream by a solid-gas separator, One or more additives selected from tar, tar slag, tar extract, and mineral waste oil are added to the pulverized coal, kneaded, quasi-particled, mixed with coarse coal, and charged into a coke oven. A method for pre-treating coal for a coke oven, comprising: maintaining a conveying path for conveying the pulverized coal together with an air current.
も保温することを特徴とする請求項１に記載のコークス
炉用石炭の事前処理方法。2. The method for pre-treating coal for a coke oven according to claim 1, wherein the solid-gas separator for separating the pulverized coal from the gas stream is also kept warm.
外周に高温水蒸気を供給して加熱することによって行う
ことを特徴とする請求項１又は２に記載のコークス炉用
石炭の事前処理方法。3. The preheating of coal for a coke oven according to claim 1 or 2, wherein the heat retention is performed by supplying high-temperature steam to the outer periphery of the conveying path and / or the solid-gas separator and heating the same. Processing method.
平面に対して傾斜させ、微粉炭の搬送路内への堆積を防
止することを特徴とする請求項１乃至３に記載のコーク
ス炉用石炭の事前処理方法。4. The coke oven according to claim 1, wherein a conveying path for conveying the pulverized coal together with the airflow is inclined with respect to a horizontal plane to prevent the pulverized coal from accumulating in the conveying path. Pretreatment method of coal.
分級機から固気分離機までの間の形状を逆Ｖ型とするこ
とを特徴とする請求項４に記載のコークス炉用石炭の事
前処理方法。5. A transport path for transporting pulverized coal together with an airflow,
The pretreatment method for coke oven coal according to claim 4, wherein the shape between the classifier and the solid-gas separator is an inverted V-shape.
び粗粒炭を冷却することを特徴とする請求項１乃至５に
記載のコークス炉用石炭の事前処理方法。6. The method for pre-treating coal for a coke oven according to claim 1, wherein the pulverized coal and the coarse coal are cooled during or after classification.
℃以下であることを特徴とする請求項６に記載のコーク
ス炉用石炭の事前処理方法。7. The temperature of the pulverized coal and the coarse coal after cooling is 60.
The method for pre-treating coal for a coke oven according to claim 6, wherein the temperature is lower than or equal to ° C.
全部を乾燥する石炭乾燥機と、該乾燥した石炭を微粉炭
と粗粒炭に分級する石炭分級機と、該微粉炭を気流と共
に搬送する搬送路であって保温手段を有する搬送路と、
微粉炭を気流から分離する固気分離機と、該微粉炭にタ
ール、タール滓、タール抽出物、鉱物系廃油から選ばれ
た１種または２種以上の添加物を加えて混練、擬似粒子
化する混練機と、該擬似粒子化した微粉炭と粗粒炭を混
合してコークス炉に装入する搬送機を有することを特徴
とするコークス炉用石炭の事前処理装置。8. A coal dryer for drying a part or all of the moisture adhering to the coal for a coke oven, a coal classifier for classifying the dried coal into pulverized coal and coarse coal, and the pulverized coal together with an airflow. A conveying path for conveying, the conveying path having a heat retaining means,
A solid-gas separator for separating pulverized coal from an air stream, kneading and adding one or more additives selected from tar, tar slag, tar extract, and mineral waste oil to the pulverized coal, and kneading and pseudo-particle formation A premixing apparatus for a coke oven coal, comprising: a kneader that mixes the pulverized coal and the coarse coal that have been quasi-granulated into a coke oven.
保温手段を有することを特徴とする請求項８記載のコー
クス炉用石炭の事前処理装置。9. The pretreatment apparatus for coal for a coke oven according to claim 8, wherein the solid-gas separator for separating pulverized coal from an air stream has a heat retaining means.
離機の外周に高温水蒸気を供給する配管を配してなるこ
とを特徴とする請求項８又は９記載のコークス炉用石炭
の事前処理装置。10. The preheating method for a coke oven coal according to claim 8, wherein the heat retaining means is provided with a pipe for supplying high-temperature steam at a periphery of the conveying path and / or the solid-gas separator. Processing equipment.
水平面に対して傾斜してなることを特徴とする請求項８
乃至１０に記載のコークス炉用石炭の事前処理装置。11. A transport path for transporting pulverized coal together with an air current is inclined with respect to a horizontal plane.
11. A pretreatment device for coal for a coke oven according to any one of claims 10 to 10.
は、分級機から固気分離機までの間の形状を逆Ｖ型とし
てなることを特徴とする請求項１１に記載のコークス炉
用石炭の事前処理装置。12. The coal path for a coke oven according to claim 11, wherein the conveying path for conveying the pulverized coal together with the air current has an inverted V-shape between the classifier and the solid-gas separator. Pre-processing device.
粉炭冷却機および粗粒炭冷却機を有することを特徴とす
る請求項８乃至１２記載のコークス炉用石炭の事前処理
装置。13. The pretreatment device for a coke oven coal according to claim 8, further comprising a pulverized coal cooler for cooling the classified pulverized coal and coarse coal, and a coarse coal cooler.
と粗粒炭に分級すると同時に該微粉炭と粗粒炭を冷却す
る石炭分級冷却機であることを特徴とする請求項８乃至
１２記載のコークス炉用石炭の事前処理装置。14. The coal classifier is a coal classifier that classifies dried coal into fine coal and coarse coal and simultaneously cools the fine coal and coarse coal. A pretreatment device for coal for a coke oven according to the above.
石炭分級冷却機で冷却した微粉炭と混合することを特徴
とする請求項１４記載のコークス炉用石炭の事前処理装
置。15. The coal pretreatment apparatus for a coke oven according to claim 14, wherein the pulverized coal exhausted and collected from the coal dryer is mixed with the pulverized coal cooled by a coal classification cooler.
ることを特徴とする請求項１４又は１５記載のコークス
炉用石炭の事前処理装置。16. The pretreatment apparatus for coke oven coal according to claim 14, wherein the classifying cooler is a fluidized bed type classifying cooler.
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|---|---|---|---|
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2003057180A1 (en) * | 2001-12-28 | 2003-07-17 | Tokuyama Corporation | Adhesives for dental use |
| JP2011246758A (en) * | 2010-05-26 | 2011-12-08 | Kobe Steel Ltd | Device for storing reduced iron |
| JP2020015792A (en) * | 2018-07-24 | 2020-01-30 | 日本製鉄株式会社 | Manufacturing method of coke oven coal charge |
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