JP2001089767A - Production of molded coke - Google Patents

Production of molded coke

Info

Publication number
JP2001089767A
JP2001089767A JP26607399A JP26607399A JP2001089767A JP 2001089767 A JP2001089767 A JP 2001089767A JP 26607399 A JP26607399 A JP 26607399A JP 26607399 A JP26607399 A JP 26607399A JP 2001089767 A JP2001089767 A JP 2001089767A
Authority
JP
Japan
Prior art keywords
coal
coke
molded
waste plastic
gas
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
Application number
JP26607399A
Other languages
Japanese (ja)
Other versions
JP4153627B2 (en
Inventor
Kenji Kato
健次 加藤
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nippon Steel Corp
Original Assignee
Nippon Steel Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nippon Steel Corp filed Critical Nippon Steel Corp
Priority to JP26607399A priority Critical patent/JP4153627B2/en
Publication of JP2001089767A publication Critical patent/JP2001089767A/en
Application granted granted Critical
Publication of JP4153627B2 publication Critical patent/JP4153627B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P20/00Technologies relating to chemical industry
    • Y02P20/141Feedstock
    • Y02P20/143Feedstock the feedstock being recycled material, e.g. plastics

Landscapes

  • Coke Industry (AREA)

Abstract

PROBLEM TO BE SOLVED: To provide a method for producing a molded coke which has a high porosity and a high strength and can reduce ventilation resistance in a blast furnace, and to provide a method for recycling waste plastics as a thermal cracking gas. SOLUTION: This method for producing molded coke comprises adding waste plastics to a blended coal comprising 10 to 50 wt.% of caking coal and 90 to 50 wt.% of fine non-caking coal, press-molding the mixture, and then carbonizing the molded coal. Therein, the waste plastics are preferably added in an amount of 1 to 5 pts.wt. to 100 pts.wt. of the blended coal. The diameter of the waste plastics is preferably <=1/3 of that of the molded coal.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【0001】[0001]

【発明の属する技術分野】本発明は、高炉用コークスに
用いられる成形コークスの製造方法に関し、特に原料に
廃プラスチックを添加することを特徴とする成形コーク
スの製造方法に関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing molded coke used for blast furnace coke, and more particularly to a method for producing molded coke characterized by adding waste plastic to a raw material.

【0002】[0002]

【従来の技術】高炉用コークスとして用いられる成形コ
ークスの製造方法が知られている。高炉用成形コークス
の製造方法は、例えば特公昭60−38437号公報に
示されているように、非微粘結炭を主配合とした原料炭
を塊成化して成形炭とし、該成形炭を乾留することによ
り成形コークスを製造する方法である。その代表的な方
法は、非微粘結炭を主配合とした配合炭にタール、ピッ
チ、石油アスファルトなどのバインダーを添加した後、
高圧に加圧して塊成化して成形炭とし、該成形炭を竪型
シャフト炉内で加熱ガスを熱媒として直接的に加熱・乾
留する方法である。この方法で製造した成形コークス
は、高炉用コークスとして高炉内に充填した場合に高炉
内の通気抵抗が増加するという問題点を有していた。
2. Description of the Related Art There is known a method for producing molded coke used as blast furnace coke. As described in Japanese Patent Publication No. 60-38437, for example, a method for producing a molded coke for a blast furnace is to agglomerate a raw coal mainly containing a non-finely caking coal into a molded coal, and to form the molded coal. This is a method for producing molded coke by carbonization. The typical method is to add tar, pitch, binder such as petroleum asphalt to blended coal mainly containing non-sintered coal,
In this method, coal is formed by agglomeration by pressurizing to a high pressure to form coal, and the coal is directly heated and carbonized in a vertical shaft furnace using a heating gas as a heat medium. The molded coke produced by this method has a problem that when filled in a blast furnace as coke for a blast furnace, the ventilation resistance in the blast furnace increases.

【0003】成形コークスを使用したときの高炉内の通
気抵抗を低減することを目的として、成形炭のサイズを
大きくすることや形状を変えることによって成形コーク
スの粒度及び形状を変更し、高炉内に装入した場合の空
隙率を増加させることにより通気抵抗を低減する方法が
検討されており、例えば特開平6−57258号公報、
特開平6−57259号公報、特開平6−57260号
公報等に開示されている。
[0003] In order to reduce the ventilation resistance in the blast furnace when using the formed coke, the grain size and shape of the formed coke are changed by increasing the size and changing the shape of the formed coal, and the Methods for reducing the airflow resistance by increasing the porosity when charged are being studied. For example, Japanese Patent Application Laid-Open No. 6-57258 discloses a method.
It is disclosed in JP-A-6-57259 and JP-A-6-57260.

【0004】[0004]

【発明が解決しようとする課題】しかし、成形コークス
のサイズや形状を変更するのみでは通気抵抗の低減にも
限度があり、また形状を変化させた成形コークスの強度
が弱い場合には高炉への輸送工程において成形コークス
が割れてしまうため、高炉装入原料としての使用が困難
になる。
However, only by changing the size and shape of the formed coke, there is a limit to the reduction of the ventilation resistance, and when the strength of the formed coke having the changed shape is weak, it is difficult to use the blast furnace. Since the formed coke is broken in the transportation process, it becomes difficult to use the coke as a raw material for the blast furnace.

【0005】プラスチック産業廃棄物、プラスチック一
般廃棄物として大量に排出される廃プラスチックの処理
に関しては、従来は大部分が埋め立てや一部焼却処理さ
れている。廃プラスチックは、埋め立てにおいては土中
の細菌やバクテリアで分解されず、焼却する場合は発熱
量が大きく焼却炉に悪影響を及ぼすとともに、塩素を含
む廃プラスチックの場合は排ガス中の塩素の処理が問題
となっている。埋め立て処分場が将来不足することが予
想されること、及び環境問題の高まりから廃プラスチッ
クのリサイクルの促進が望まれている。リサイクルの方
法としては、プラスチックとしての再利用のほか、燃焼
時の熱の利用や熱分解で得られるガスや油を燃料や化学
原料として利用する方法が考えられる。
[0005] Regarding the treatment of waste plastic discharged in large quantities as plastic industrial waste and plastic general waste, most of the waste has conventionally been landfilled or partially incinerated. Waste plastics are not decomposed by bacteria and bacteria in the soil when landfilled, and when incinerated, generate a large amount of heat and adversely affect incinerators.In the case of waste plastics containing chlorine, the treatment of chlorine in exhaust gas is a problem. It has become. It is anticipated that the landfill disposal site will be in short supply in the future, and environmental problems are increasing, and it is desired to promote recycling of waste plastic. As a recycling method, in addition to reuse as plastic, a method of utilizing heat at the time of combustion or a gas or oil obtained by thermal decomposition as a fuel or a chemical raw material can be considered.

【0006】本発明は、気孔率が高く、かつ強度が高
く、高炉内の通気抵抗を低減することのできる成形コー
クスの製造方法を提供すると同時に、廃プラスチックを
熱分解ガスとしてリサイクルする方法を提供することを
目的とする。
The present invention provides a method for producing molded coke which has a high porosity, a high strength and can reduce the ventilation resistance in a blast furnace, and a method for recycling waste plastic as a pyrolysis gas. The purpose is to do.

【0007】[0007]

【課題を解決するための手段】即ち、本発明の要旨とす
るところは以下のとおりである。 (1)粘結炭及び非微粘結炭を含み、粘結炭配合率が1
0〜50重量%である配合炭に廃プラスチックを添加し
て混合し、該混合物を加圧成形して成形炭とし、該成形
炭を乾留して成形コークスを製造することを特徴とする
成形コークスの製造方法。 (2)配合炭100重量部に対し、廃プラスチックを1
〜5重量部添加して混合することを特徴とする上記
(1)に記載の成形コークスの製造方法。 (3)廃プラスチックの粒径を成形炭の1/3以下とす
ることを特徴とする上記(1)又は(2)に記載の成形
コークスの製造方法。
That is, the gist of the present invention is as follows. (1) Includes caking coal and non-micro caking coal, and has a caking coal mixing ratio of 1
A molded coke characterized in that waste plastic is added to a blended coal of 0 to 50% by weight and mixed, the mixture is press-molded to form a molded coal, and the molded coal is carbonized to produce a molded coke. Manufacturing method. (2) 1 waste plastic per 100 parts by weight of coal blend
The method for producing molded coke according to the above (1), wherein 55 parts by weight are added and mixed. (3) The method for producing molded coke as described in (1) or (2) above, wherein the particle size of the waste plastic is 1/3 or less of the molded coal.

【0008】本発明は、成形コークスの製造に際し、非
微粘結炭を主配合とする配合炭に廃プラスチックを添加
することを特徴とする。廃プラスチックは成形コークス
製造時の高温加熱によって熱分解し、その大部分は分解
ガスとして揮発する。そのため、成形コークス原料であ
る成形炭中に混合した廃プラスチック部分は成形コーク
ス製造中に気孔となり、成形コークスの通気性を向上す
ることができる。また、廃プラスチックが熱分解して発
生した分解ガスは高カロリーのガスであり、コークス炉
ガスに含まれて回収され、熱エネルギーとして再利用さ
れる。
[0008] The present invention is characterized in that waste plastic is added to blended coal mainly containing non-slightly caking coal when producing molded coke. Waste plastic is thermally decomposed by high temperature heating during the production of molded coke, and most of it is volatilized as a decomposition gas. Therefore, the waste plastic portion mixed in the forming coal as the forming coke raw material becomes a pore during the manufacturing of the forming coke, and the air permeability of the forming coke can be improved. The decomposition gas generated by the thermal decomposition of the waste plastic is a high-calorie gas, which is contained and recovered in the coke oven gas and reused as thermal energy.

【0009】[0009]

【発明の実施の形態】一般に、石炭は粘結性は高いが高
価である粘結炭と粘結性が低く廉価である非微粘結炭に
分類される。成形コークス製造においては、所定のコー
クス品質が得られるように粘結炭と非微粘結炭を所定の
割合で配合して使用している。いわゆる室炉式コークス
が粘結炭を主配合として製造するのに対し、成形コーク
スは粘結炭配合率を下げ非微粘結炭を主配合として製造
できる点に特徴がある。
DETAILED DESCRIPTION OF THE INVENTION In general, coal is classified into a caking coal which has a high caking property but is expensive, and a non-fine caking coal which has a low caking property and is inexpensive. In the production of molded coke, caking coal and non-fine caking coal are blended and used in a predetermined ratio so as to obtain a predetermined coke quality. Whereas so-called coke oven coke produces caking coal as a main blend, molded coke is characterized in that the caking coal blending ratio is reduced and non-fine caking coal can be produced as a main blend.

【0010】本発明においては、原料とする配合炭は粘
結炭及び非微粘結炭を含む。配合炭中の粘結炭の割合が
50重量%を超えると成形炭を乾留する際に過剰に膨れ
るため、粘結炭の割合の上限を50重量%に規定する。
また、粘結炭の割合が少なすぎると強度の高い成形コー
クスを製造できないため、粘結炭の配合割合の下限を1
0重量%に規定する。
In the present invention, the blended coal as a raw material includes caking coal and non-fine caking coal. If the ratio of caking coal in the blended charcoal exceeds 50% by weight, excessive swelling occurs when dry-forming the formed coal. Therefore, the upper limit of the ratio of caking coal is set to 50% by weight.
If the ratio of the caking coal is too small, it is impossible to produce a high-strength molded coke.
It is defined as 0% by weight.

【0011】ここで非微粘結炭とは、一般にJIS M
8801に規定されたギーセラープラストメーター法に
よる流動性試験において最高流動度指数が10ddpm
以下であるか、あるいはビトリニットの平均反射率が
0.8以下である石炭のことをいう。
[0011] Here, non-fine caking coal generally means JIS M
The highest fluidity index is 10 ddpm in the fluidity test by the Giesler plastometer method specified in 8801.
Or coal whose average reflectance of vitrinite is 0.8 or less.

【0012】配合炭中には、さらにバインダーとしてS
OP、タール、ピッチ、石油アスファルト等を含有す
る。SOPとはソフトピッチのことであり、タールを蒸
留してタール中の軽質油留分を除去した残留物のことで
ある。
In the coal blend, S is further added as a binder.
Contains OP, tar, pitch, petroleum asphalt, etc. SOP is soft pitch, and is a residue obtained by distilling tar and removing a light oil fraction in the tar.

【0013】本発明の成形炭原料として配合炭に混合す
る廃プラスチックは、好ましくは配合炭100重量部に
対し、廃プラスチックを1〜5重量部添加して混合す
る。廃プラスチック添加量が1重量部未満では廃プラス
チックリサイクルとして有効ではなく、また廃プラスチ
ック添加量が5重量部以下であれば成形コークスの強度
が十分に保たれるからである。
The waste plastic to be mixed with the blended coal as the raw material for forming coal of the present invention is preferably added by mixing 1 to 5 parts by weight of the waste plastic with respect to 100 parts by weight of the blended coal. If the added amount of waste plastic is less than 1 part by weight, it is not effective as waste plastic recycling, and if the added amount of waste plastic is 5 parts by weight or less, the strength of the molded coke is sufficiently maintained.

【0014】また、配合炭に添加する廃プラスチックの
粒径が大きすぎると成形コークス内に亀裂が生じ、成形
コークスの強度が低下するため、廃プラスチックの粒径
は成形炭の1/3以下が好ましい。より好ましくは廃プ
ラスチックの粒径は成形炭の1/5以下とする。ここで
廃プラスチックの粒径は平均粒径を指し、成形炭の大き
さは、成形炭の長さ、幅、厚さが異なる場合、そのうち
の最も小さい値のものを指す。
On the other hand, if the particle size of the waste plastic added to the coal blend is too large, cracks are formed in the formed coke and the strength of the formed coke is reduced. preferable. More preferably, the particle size of the waste plastic is 1/5 or less of the coal. Here, the particle size of the waste plastic refers to the average particle size, and the size of the formed coal refers to the smallest value among the different lengths, widths, and thicknesses of the formed coal.

【0015】粘結炭と非微粘結炭及びバインダーを所定
の配合割合で配合した配合炭に廃プラスチックを混合
し、加圧成形して成形炭を製造する。加圧成形にはダブ
ルロール型成形機等を使用することができる。成形後の
成形炭の形状は、例えば図2に示すような形状とする。
成形炭の形状としては、枕型および中央部に凹型のへこ
みのある形状のものなどが好ましい。成形炭の1個あた
りの重量が重過ぎると、成形炭の輸送、および乾留時に
割れることがある。この割れを防止するために、成形炭
の長さと幅については40〜80mmの範囲が好まし
い。また、成形炭の厚さは30〜50mm程度が好まし
い。
[0015] Waste plastic is mixed with blended coal in which caking coal, non-fine caking coal and a binder are blended in a predetermined blending ratio, and molded under pressure to produce molded coal. A double-roll molding machine or the like can be used for pressure molding. The shape of the formed coal after forming is, for example, a shape as shown in FIG.
As the shape of the formed charcoal, a pillow shape and a shape having a concave shape in the center are preferable. If the weight per piece of the coal is too heavy, the coal may be broken during transportation and carbonization. In order to prevent this cracking, the length and width of the formed coal are preferably in the range of 40 to 80 mm. Further, the thickness of the formed coal is preferably about 30 to 50 mm.

【0016】成形炭を乾留して成形コークスとするため
のシャフト炉を図1に示す。成形炭は、成形炭装入装置
1から装入され、シャフト炉乾留室2内を順次降下す
る。乾留室2は低温ガス吹き込み羽口5及び高温ガス吹
き込み羽口6を有し、各羽口には低温ガス加熱器10及
び高温ガス加熱器11から成形炭加熱用ガスが供給され
る。乾留室2を順次降下する成形炭は、各羽口5、6か
らの熱ガスによって乾留温度に到達し、乾留されて成形
コークスとなり、成形コークス排出口3から順次排出さ
れる。
FIG. 1 shows a shaft furnace for carbonizing formed coal to form coke. The formed coal is charged from the formed coal charging apparatus 1 and sequentially descends in the shaft furnace dry distillation chamber 2. The dry distillation chamber 2 has a low-temperature gas blowing tuyere 5 and a high-temperature gas blowing tuyere 6, and a gas for forming coal heating is supplied from a low-temperature gas heater 10 and a high-temperature gas heater 11 to each tuyere. The formed coal sequentially descending in the carbonization chamber 2 reaches the carbonization temperature by the hot gas from each tuyere 5, 6, is carbonized to form molded coke, and is discharged from the molded coke discharge port 3 sequentially.

【0017】各羽口5、6から乾留室に導入された高温
ガス及び乾留によって発生した熱分解ガスは、循環ガス
抜き出しダクト4から排出される。ガスは循環ガス冷却
器9において安水のフラッシングを受けることによって
冷却され、軽油およびタールを分離した後、一部のガス
は再度各ガス加熱器10、11によって加熱され、乾留
室2に循環する。残りのガスはコークス炉ガスとしてコ
ークス炉ガス回収設備16によって回収される。タール
はタール回収設備12によって回収される。安水は、安
水回収設備13で回収された後、苛性ソーダ添加設備1
4によって苛性ソーダを添加することにより、安水中の
塩化アンモニウムが塩化ナトリウムとアンモニアに転換
され、その後アンモニアは脱安設備15で気化除去され
る。
The high-temperature gas introduced from each tuyere 5 and 6 into the carbonization chamber and the pyrolysis gas generated by the carbonization are discharged from the circulation gas extraction duct 4. The gas is cooled by being subjected to flushing with the circulating water in the circulating gas cooler 9, and after separating light oil and tar, a part of the gas is heated again by the gas heaters 10 and 11 and circulated to the carbonization chamber 2. . The remaining gas is recovered by the coke oven gas recovery facility 16 as coke oven gas. The tar is collected by the tar collecting facility 12. After the water is recovered by the water recovery equipment 13, the caustic soda addition equipment 1
By adding caustic soda by 4, ammonium chloride in the sewage is converted into sodium chloride and ammonia, and the ammonia is then vaporized and removed in the deaeration facility 15.

【0018】コークス乾留時の高温によって廃プラスチ
ックの大部分は熱分解し、水素、メタン、エタン、プロ
パン等の高カロリー還元分解ガスとなる。この分解ガス
は、循環ガス中に含まれて循環ガス抜き出しダクト4か
ら排出された後、コークス炉ガスとして回収される。廃
プラスチックの熱分解によって発生した熱分解ガスは、
以上のようにコークス炉ガスに含まれて回収されること
によりエネルギー源として再利用される。また、残った
炭素分はコークスの一部となって高炉で再利用される。
Most of the waste plastic is thermally decomposed due to the high temperature at the time of coking dry distillation, and becomes high calorie reduction decomposition gas such as hydrogen, methane, ethane and propane. This cracked gas is contained in the circulating gas and discharged from the circulating gas extraction duct 4, and then recovered as coke oven gas. The pyrolysis gas generated by the pyrolysis of waste plastic is
As described above, the gas contained in the coke oven gas is recovered and reused as an energy source. The remaining carbon becomes part of coke and is reused in the blast furnace.

【0019】成形炭中において廃プラスチックが占めて
いた空間は、廃プラスチックが熱分解した結果として空
洞となり、多数の空洞を有する成形コークスとなる。こ
の空洞の存在により成形コークスの通気性が高まり、高
炉での使用時に通気抵抗を低下することが可能になっ
た。
The space occupied by the waste plastic in the formed coal becomes a cavity as a result of the pyrolysis of the waste plastic, and becomes formed coke having a large number of cavities. The presence of these cavities increased the permeability of the formed coke, and made it possible to reduce the ventilation resistance when used in a blast furnace.

【0020】塩素を含有する廃プラスチックを熱処理す
る場合、環境上十分に高い温度で熱処理を行なうことが
必要である。本発明のように成形炭を竪型のシャフト炉
で乾溜する場合、乾留中の温度は最高で1100℃に到
達する。ポリ塩化ビニルやポリ塩化ビニリデンは250
℃程度から熱分解を起こし始め、約400℃でガス化
し、1100℃ではほぼ完全に分解する。従って、塩素
含有廃プラスチックをシャフト炉で成形炭に混合して熱
分解する限り、熱分解または乾留温度、乾留パターンは
従来の石炭乾留と同じでよい。
When heat-treating waste plastics containing chlorine, it is necessary to heat-treat at a sufficiently high temperature in the environment. When carbonized coal is distilled in a vertical shaft furnace as in the present invention, the temperature during carbonization reaches 1100 ° C. at the maximum. 250 for polyvinyl chloride and polyvinylidene chloride
Thermal decomposition starts at about 400 ° C., gasifies at about 400 ° C., and decomposes almost completely at 1100 ° C. Therefore, as long as the chlorine-containing waste plastic is mixed with the formed coal in the shaft furnace and pyrolyzed, the pyrolysis or carbonization temperature and the carbonization pattern may be the same as those of conventional coal carbonization.

【0021】塩素含有廃プラスチックを加熱した際に発
生する廃プラスチック由来の塩素系ガスは、石炭の乾留
中に発生する過剰のアンモニアと反応して塩化アンモニ
ウムとなる。この塩化アンモニウムは循環ガス冷却器9
において循環ガスを冷却する安水中に取り込まれる。塩
化アンモニウムが多量に蓄積した安水に、強塩基、例え
ば水酸化ナトリウム(苛性ソーダ)を添加することによ
り、塩化アンモニウムを塩化ナトリウムとアンモニアと
に分解する。図1においては、苛性ソーダ添加設備14
において安水に苛性ソーダを添加する。
[0021] The chlorine-based gas derived from the waste plastic generated when the chlorine-containing waste plastic is heated reacts with the excess ammonia generated during the carbonization of coal to form ammonium chloride. The ammonium chloride is supplied to the circulating gas cooler 9
Is taken into the circulating water for cooling the circulating gas. Ammonium chloride is decomposed into sodium chloride and ammonia by adding a strong base, for example, sodium hydroxide (caustic soda), to the aqueous solution in which ammonium chloride has accumulated in a large amount. In FIG. 1, the caustic soda addition equipment 14
In step 2, caustic soda is added to the cold water.

【0022】従来から、コークス炉には系外に取り出さ
れる安水を処理するための脱安設備15が設置されてい
る。脱安設備15においては、蒸気ストリッピングによ
ってフリーアンモニアを気化除去した後に活性汚泥処理
を行い放流する。安水中の塩化アンモニウムは上記のよ
うに脱安設備に入る前に水酸化ナトリウムによって塩化
ナトリウムとアンモニアとになっているので、安水中に
含まれていた窒素成分はすべてアンモニアの形で含有し
ている。従って、脱安設備15でアンモニアが気化除去
される結果として、安水中の窒素成分は除去される。脱
安設備を出た安水中には無害な塩化ナトリウムしか残存
しないので、このまま放流しても海水中の窒素分を増大
する心配がない。
Conventionally, a coke oven is provided with a deaeration facility 15 for treating low-temperature water taken out of the system. In the dewaxing facility 15, after free ammonia is vaporized and removed by steam stripping, activated sludge treatment is performed and discharged. As described above, ammonium chloride is converted into sodium chloride and ammonia by sodium hydroxide before entering the deaeration facility, as described above, so all nitrogen components contained in the water are contained in the form of ammonia. I have. Therefore, as a result of ammonia being vaporized and removed in the deaeration facility 15, the nitrogen component in the deionized water is removed. Since only harmless sodium chloride remains in the dewatered water leaving the deaeration facility, there is no risk of increasing the nitrogen content in seawater even if the water is discharged as it is.

【0023】[0023]

【実施例】表1に示す原料炭を配合炭とし、表2に性状
を示す廃プラスチックを配合した後、バインダーとして
SOPを3%添加して混練し、線圧2t/cmの圧力で
加圧成形して成形炭を製造した。成形炭の形状は図2に
示すとおりである。各実施例の廃プラスチック添加率、
添加した廃プラスチックの平均粒径、成形炭の長さ、
幅、厚さは表3に示すとおりである。この成形炭を図1
に示すシャフト炉で1100℃(No.5のみ1150
℃)の加熱ガスで乾留し、成形コークスを製造した。表
3のNo.1〜5が本発明例であり、No.6〜10が
比較例である。
EXAMPLE Coking coal shown in Table 1 was used as blended coal, waste plastics having properties shown in Table 2 were blended, and 3% of SOP was added as a binder and kneaded, and pressurized at a linear pressure of 2 t / cm. It was molded to produce molded coal. The shape of the coal is as shown in FIG. Waste plastic addition rate of each example,
Average particle size of added waste plastics, length of forming coal,
The width and thickness are as shown in Table 3. Fig. 1
1100 ° C. (No. 5 only 1150 ° C.)
C) to form a molded coke. No. 3 in Table 3. Nos. 1 to 5 are examples of the present invention. 6 to 10 are comparative examples.

【0024】[0024]

【表1】 [Table 1]

【0025】[0025]

【表2】 [Table 2]

【0026】[0026]

【表3】 [Table 3]

【0027】成形コークスの強度はドラム強度(DI
150 15)によって評価した。コークスのドラム強度(D
150 15)は、JIS K 2151に記載されている
ように、コークス10kgをドラム試験機(直径、長さ
とも1500mm、羽根4枚)に装入し、150回転さ
せた後、15mmの篩で篩分けし、篩上に留まった質量
を百分率で表した値である。本実施例においては、DI
150 15が82%以上であれば高炉用コークスとして良好
な強度を有していると判断した。
The strength of the formed coke is determined by the drum strength (DI
150 15 ). Coke drum strength (D
I 150 15 ) is, as described in JIS K 2151, charged with 10 kg of coke into a drum tester (both in diameter and length, 1500 mm, four blades), rotated 150 times, and then passed through a 15 mm sieve. It is the value expressed as a percentage of the mass that was sieved and remained on the sieve. In this embodiment, DI
When 150 15 was 82% or more, it was determined that the coke had good strength as blast furnace coke.

【0028】成形コークスを高炉で使用したときの通気
性は、成形コークスの気孔率によって評価した。通気抵
抗の測定方法としては、半径600mmの通気抵抗測定
装置に成形コークスを500mmの高さに充填し、下部
からエアーを導入して、充填層の差圧を測定する方法を
採用した。本実施例においては、気孔率が40%以上で
あれば高炉用成形コークスとして良好な通気性を有して
いると判断した。
The air permeability when the molded coke was used in a blast furnace was evaluated by the porosity of the molded coke. As a method of measuring the airflow resistance, a method was used in which a molded coke was filled to a height of 500 mm into an airflow resistance measuring device having a radius of 600 mm, air was introduced from below, and the differential pressure of the packed layer was measured. In this example, if the porosity was 40% or more, it was determined that the molded coke for blast furnace had good air permeability.

【0029】本発明例のNo.1〜5は、廃プラスチッ
クの添加率、粒度ともに好適な範囲にあり、ドラム強度
は十分に高い値で高炉用コークスとしての良好な強度有
し、気孔率も高い値であって高炉に用いた場合の通気抵
抗を低減することができるので、いずれの場合も品質の
よい成形コークスを製造することができた。
No. 1 of the present invention example. Nos. 1 to 5 are in a suitable range for both the addition ratio of the waste plastic and the particle size, the drum strength is a sufficiently high value, the strength as a coke for blast furnace is high, and the porosity is also a high value. Since the ventilation resistance in each case can be reduced, a high-quality molded coke can be produced in each case.

【0030】比較例のNo.6は廃プラスチックを添加
しない場合であり、コークス強度は高いものの気孔率が
低く、高炉用コークスとして使用したときの高炉内通気
抵抗を下げることができない。
No. of Comparative Example No. 6 shows the case where no waste plastic is added. Although the coke strength is high, the porosity is low, and the ventilation resistance in the blast furnace when used as blast furnace coke cannot be reduced.

【0031】比較例のNo.7〜10は、廃プラスチッ
クを添加しているので成形コークスの通気率は良好であ
るものの、添加した廃プラスチックの平均粒径が成形炭
の厚さの1/3を超えており、その結果得られた成形コ
ークスのドラム強度がいずれも低く、高炉用コークスと
しては十分な強度が得られなかった。
No. of Comparative Example In Nos. 7 to 10, although the waste plastic was added, the permeability of the formed coke was good, but the average particle size of the added waste plastic exceeded 1/3 of the thickness of the formed charcoal. The drum strength of the formed coke was low, and sufficient strength was not obtained as blast furnace coke.

【0032】[0032]

【発明の効果】高炉用に用いる成形コークスの原料炭に
廃プラスチックを添加することにより、気孔率が高く強
度の高い良質な成形コークスを製造することが可能にな
った。これにより、成形コークスを高炉に用いた場合の
高炉内通気抵抗を下げることができ、かつ廃プラスチッ
クを有効にリサイクルすることが可能になった。
According to the present invention, by adding waste plastic to the raw coal of molded coke used for blast furnaces, it is possible to produce high-quality molded coke having high porosity and high strength. As a result, when the molded coke is used in the blast furnace, the ventilation resistance in the blast furnace can be reduced, and the waste plastic can be effectively recycled.

【図面の簡単な説明】[Brief description of the drawings]

【図1】本発明に用いる成形コークス製造用シャフト炉
を示す図である。
FIG. 1 is a diagram showing a shaft furnace for producing molded coke used in the present invention.

【図2】成形炭の形状を示す図である。FIG. 2 is a view showing a shape of a formed coal.

【符号の説明】 1 成形炭装入装置 2 シャフト炉乾留室 3 成形コークス排出口 4 循環ガス抜き出しダクト 5 低温ガス吹き込み羽口 6 高温ガス吹き込み羽口 7 昇温ガス抜き出しダクト 8 冷却ガス吹き込み羽口 9 循環ガス冷却器 10 低温ガス加熱器 11 高温ガス加熱器 12 タール回収設備 13 安水回収設備 14 苛性ソーダ添加設備 15 脱安設備 16 コークス炉ガス回収設備[Description of Signs] 1 Molded charcoal charging device 2 Shaft furnace dry distillation chamber 3 Molded coke outlet 4 Circulating gas extraction duct 5 Low temperature gas injection tuyere 6 High temperature gas injection tuyere 7 Heated gas extraction duct 8 Cooling gas injection tuyere 9 Circulating gas cooler 10 Low temperature gas heater 11 High temperature gas heater 12 Tar recovery equipment 13 Water recovery equipment 14 Caustic soda addition equipment 15 Deaeration equipment 16 Coke oven gas recovery equipment

Claims (3)

【特許請求の範囲】[Claims] 【請求項1】 粘結炭及び非微粘結炭を含み、粘結炭配
合率が10〜50重量%である配合炭に廃プラスチック
を添加して混合し、該混合物を加圧成形して成形炭と
し、該成形炭を乾留して成形コークスを製造することを
特徴とする成形コークスの製造方法。
1. A waste plastic is added to a coal blend containing caking coal and non-fine caking coal and having a blending ratio of caking coal of 10 to 50% by weight and mixed, and the mixture is subjected to pressure molding. A method for producing molded coke, comprising forming molded coal and carbonizing the molded coal to produce molded coke.
【請求項2】 配合炭100重量部に対し、廃プラスチ
ックを1〜5重量部添加して混合することを特徴とする
請求項1に記載の成形コークスの製造方法。
2. The method for producing molded coke according to claim 1, wherein 1 to 5 parts by weight of waste plastic is added to 100 parts by weight of the blended coal and mixed.
【請求項3】 廃プラスチックの粒径を成形炭の1/3
以下とすることを特徴とする請求項1又は2に記載の成
形コークスの製造方法。
3. The particle size of the waste plastic is reduced to 1/3 of that of the formed coal.
The method for producing molded coke according to claim 1 or 2, wherein:
JP26607399A 1999-09-20 1999-09-20 Method for producing molded coke Expired - Lifetime JP4153627B2 (en)

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Country Link
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012137893A1 (en) * 2011-04-06 2012-10-11 株式会社神戸製鋼所 Coal molded body
CN102994128A (en) * 2011-12-21 2013-03-27 山西鑫立能源科技有限公司 Proportioning method of coal as fired for coal pyrolysis furnace

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012137893A1 (en) * 2011-04-06 2012-10-11 株式会社神戸製鋼所 Coal molded body
CN102994128A (en) * 2011-12-21 2013-03-27 山西鑫立能源科技有限公司 Proportioning method of coal as fired for coal pyrolysis furnace

Also Published As

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