JPH09310079A - Modification of coal and production of cwm - Google Patents

Modification of coal and production of cwm

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Publication number
JPH09310079A
JPH09310079A JP12590696A JP12590696A JPH09310079A JP H09310079 A JPH09310079 A JP H09310079A JP 12590696 A JP12590696 A JP 12590696A JP 12590696 A JP12590696 A JP 12590696A JP H09310079 A JPH09310079 A JP H09310079A
Authority
JP
Japan
Prior art keywords
coal
tar
water
vacuum
cwm
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
JP12590696A
Other languages
Japanese (ja)
Other versions
JP3941131B2 (en
Inventor
Hiroki Usui
洋基 薄井
Kotaro Katagiri
光太郎 片桐
Original Assignee
Ube Ind Ltd
宇部興産株式会社
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Filing date
Publication date
Application filed by Ube Ind Ltd, 宇部興産株式会社 filed Critical Ube Ind Ltd
Priority to JP12590696A priority Critical patent/JP3941131B2/en
Publication of JPH09310079A publication Critical patent/JPH09310079A/en
Application granted granted Critical
Publication of JP3941131B2 publication Critical patent/JP3941131B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Abstract

PROBLEM TO BE SOLVED: To modify coal into such coal as to be high in calorific value as a fuel because of its low volatility of the volatiles even if dried and suitable for producing highly concentrated and highly fluid coal-water slurry, by drying pulverized coat at a specific temperature followed by addition of tar to conduct a non-waterabsorbing treatment. SOLUTION: Pulverized coal (ground to e.g. <=5mm, esp. <=500μm in particle size) is dried by heating to 180-230 deg.C in a nonoxidative atmosphere such as in a vacuum, nitrogen, carbon dioxide or combustion exhaust gas followed by addition of tar such as coal tar and then further heating to 200-300 deg.C to effect adhesion of the tar to the surface of coal particles, thus conducting a nonwater-absorbing treatment of the coal. Specifically, for example, low-grade coal is ground by a mill 1, introduced into a vacuum paddle dryer 3, and the inside of the dryer 3 is brought to a vacuum by a steam ejector 4; the pulverized coal is then dried under heating at a prescribed temperature while agitating it with a paddle 3a; subsequently, molten tar is introduced, via a pump 6, into the vicinity of the exit of the dryer 3 and agitated with the paddle 3a, thus coating the coal surface with the tar.

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】本発明は石炭の改質方法及び
CWMの製造方法に係り、特に石炭を乾燥し次いで非吸
水化処理する方法と、それを用いたCWM(石炭・水ス
ラリー)の製造方法に関する。詳しくは、処理温度が比
較的低くなるよう改良された石炭の改質方法及びCWM
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 reforming coal and a method for producing CWM, and more particularly, a method for drying coal and then performing non-water-absorption treatment, and production of CWM (coal / water slurry) using the method. Regarding the method. More specifically, a coal reforming method and CWM improved so that the treatment temperature is relatively low.
And a method for producing the same.
【0002】[0002]
【従来の技術】石炭を乾燥した後非吸水化処理する方法
として、石炭を粉砕した後、270〜330℃、80〜
150kg/cm2 の熱水条件下に10〜30分保持す
ることにより石炭を脱水処理(石炭粒子中からの水分の
離脱処理)及び非吸水化処理する方法、並びにこのよう
に処理された石炭粉末を水に分散させてCWMを製造す
る方法が公知である(第5回石炭利用技術会議講演集
(平成7年9月)。主催(財)石炭利用総合センター、
後援:資源エネルギー庁)。
2. Description of the Related Art As a method of non-water absorption treatment after drying coal, it is crushed at 270 to 330 ° C. and 80 to
Method for dehydrating coal (treatment for removing water from coal particles) and non-water-absorbing treatment by holding under hot water conditions of 150 kg / cm 2 for 10 to 30 minutes, and coal powder thus treated A method for dispersing CWM in water to produce CWM is known (5th Coal Utilization Technology Conference Lecture Collection (September 1995). Sponsored Coal Utilization Center,
Sponsor: Agency for Natural Resources and Energy).
【0003】なお、石炭を300℃以上に加熱すると、
水分が抜けると共に、石炭中に含まれるタール分が液状
となって石炭粒子表面ににじみ出てきて石炭粒子表面の
細孔を塞ぎ、石炭の比表面積が低下して吸湿性が低下す
るようになることは公知である(例えば特公昭57−1
1596号)。
When coal is heated to 300 ° C. or higher,
With the loss of water, the tar content contained in the coal becomes liquid and oozes out on the surface of the coal particles to block the pores on the surface of the coal particles, which reduces the specific surface area of the coal and decreases the hygroscopicity. Are known (for example, Japanese Patent Publication No. 57-1).
1596).
【0004】[0004]
【発明が解決しようとする課題】上記の石炭の乾燥及び
非吸水化処理では、いずれも加熱温度が270℃以上と
高温であり、石炭中の揮発分の揮散も多くなり、石炭発
熱量が低下してしまうおそれが大きい。
In the above drying and non-water-absorption treatment of coal, the heating temperature is as high as 270 ° C. or higher, the volatilization of volatile components in the coal increases, and the calorific value of coal decreases. There is a great risk of doing so.
【0005】本発明は、従来よりも低い温度で石炭の乾
燥及び非吸水化処理が可能な石炭の改質方法と、それを
利用したCWMの製造方法を提供することを目的とす
る。
It is an object of the present invention to provide a coal reforming method capable of drying and non-water absorbing treatment of coal at a lower temperature than before, and a CWM manufacturing method using the same.
【0006】[0006]
【課題を解決するための手段】本発明の石炭の改質方法
は、粉砕した石炭を非酸化性雰囲気中で180〜230
℃に加熱して乾燥し、次いでタールを添加して石炭粒子
の表面に該タールを付着させる非吸水化処理を行うこと
を特徴とするものである。本発明のCWMの製造方法
は、この改質方法によって石炭粉末を改質した後、水に
分散させてCWMとするものである。
According to the method for reforming coal of the present invention, pulverized coal is heated to 180 to 230 in a non-oxidizing atmosphere.
It is characterized in that it is heated to ℃ and dried, and then tar is added to carry out a non-water absorption treatment for adhering the tar to the surface of the coal particles. The method for producing a CWM according to the present invention is one in which coal powder is modified by this modifying method and then dispersed in water to obtain a CWM.
【0007】本発明のCWMの製造方法は、この改質方
法によって石炭粉末を改質した後、水に分散させてCW
Mとするものである。
The method for producing CWM according to the present invention comprises the steps of modifying coal powder by this modifying method and then dispersing it in water to form CW.
It is assumed to be M.
【0008】かかる本発明の石炭の改質方法では、加熱
温度が180〜230℃と従来よりもかなり低いため、
揮発成分も十分に残留するようになる。なお、加熱温度
が低いと、石炭粒子内部からタール状物質が表面に殆ど
にじみ出て来ないが、外部からタールを添加することに
より、石炭粒子表面をタールで覆って石炭を非吸水化す
ることができる。
In the coal reforming method of the present invention, since the heating temperature is 180 to 230 ° C., which is considerably lower than the conventional temperature,
Volatile components also remain sufficiently. When the heating temperature is low, the tar-like substance hardly oozes out from the inside of the coal particles to the surface, but by adding tar from the outside, it is possible to cover the coal particle surface with tar and dewater the coal. it can.
【0009】[0009]
【発明の実施の形態】本発明において、石炭の炭種は特
に限定されないが、本発明は褐炭など従来それほど利用
されていない低品位炭の処理に適用するのに好適であ
る。
BEST MODE FOR CARRYING OUT THE INVENTION In the present invention, the coal type of coal is not particularly limited, but the present invention is suitable for application to the treatment of low-grade coal such as brown coal which has not been used so far.
【0010】本発明では、まず石炭を2mm以下好まし
くは500μm以下に粉砕する。次いで非酸化性雰囲気
中で180〜230℃に加熱して乾燥する。非酸化性雰
囲気としては、真空のほか窒素、炭酸ガス、燃焼排ガス
等を用いることができる。
In the present invention, coal is first crushed to 2 mm or less, preferably 500 μm or less. Then, it is heated to 180 to 230 ° C. in a non-oxidizing atmosphere and dried. As the non-oxidizing atmosphere, in addition to vacuum, nitrogen, carbon dioxide gas, combustion exhaust gas or the like can be used.
【0011】この乾燥温度が180℃よりも低いと、水
分の抜けが不十分となる。一方、230℃よりも高温で
あると、揮発成分の揮発量が多くなる。好ましい乾燥温
度は190〜220℃である。
If the drying temperature is lower than 180 ° C., the moisture will be insufficiently removed. On the other hand, when the temperature is higher than 230 ° C, the amount of volatile components volatilized increases. The preferred drying temperature is 190 to 220 ° C.
【0012】この乾燥処理後、タール(好ましくはコー
ルタール)を添付して加熱し、石炭粒子表面をタールで
覆う。タールの添加量は、石炭1kgに対し10〜10
0gとりわけ10〜20g程度とするのが好ましい。タ
ールを添加した後(あるいはタール添加前の段階から)
石炭を200〜300℃好ましくは230〜270℃に
加熱することにより、タールが石炭粒子表面を覆い、石
炭が非吸水性を帯びるようになる。なお、後述の図1〜
3の装置のように、乾燥と非吸水化処理とを同一チャン
バ内で行う場合には、この乾燥温度と非吸水化処理温度
とはほぼ等しいものとなる。
After this drying treatment, tar (preferably coal tar) is attached and heated to coat the surface of the coal particles with tar. The amount of tar added is 10 to 10 with respect to 1 kg of coal.
It is preferably 0 g, especially about 10 to 20 g. After adding tar (or from the stage before adding tar)
By heating the coal to 200 to 300 ° C., preferably 230 to 270 ° C., tar covers the surface of the coal particles and the coal becomes non-water absorbent. In addition, FIG.
When the drying and the non-water-absorption treatment are performed in the same chamber as in the apparatus of No. 3, the drying temperature and the non-water-absorption treatment temperature are almost the same.
【0013】非吸水化処理後、この石炭粉末を水中に分
散させることによりCWMを得る。この際、分散剤など
の添加物を添加するのが好ましい。非吸水化処理により
石炭粒子が殆ど吸水しないようになっているため、CW
Mとしたとき,十分低い粘度を保ちつつCWM中の石炭
濃度を60重量%以上とすることができる。
After the non-water absorption treatment, the coal powder is dispersed in water to obtain CWM. At this time, it is preferable to add an additive such as a dispersant. Since the coal particles are hardly absorbed by the non-water absorption treatment, CW
When M is set, the coal concentration in CWM can be set to 60% by weight or more while maintaining a sufficiently low viscosity.
【0014】図1〜3は低品位炭を本発明方法によって
改質する場合の装置の概略的なフロー図である。
1 to 3 are schematic flow charts of an apparatus for reforming low-grade coal by the method of the present invention.
【0015】図1の改質装置では、低品位炭をミル1で
粉砕し、ロックホッパ2を経て真空パドルドライヤ3に
導入する。パドル3aで撹拌しながらスチーム等の熱源
により真空パドルドライヤ3中で石炭を加熱乾燥する。
なお、この真空パドルドライヤ3内をスチームエジェク
タ4で吸引し、内部をほぼ真空状態とする。この真空パ
ドルドライヤ3の出口近傍で溶融タールをタンク5、ポ
ンプ6を介して導入し、パドル3aでよく撹拌して石炭
表面をタールで覆う。この後、石炭を真空パドルドライ
ヤ3からロックホッパ7を介して取り出し、スラリータ
ンク8へ送りCWMとする。
In the reformer of FIG. 1, low-grade coal is crushed by a mill 1 and introduced into a vacuum paddle dryer 3 through a lock hopper 2. The coal is heated and dried in the vacuum paddle dryer 3 by a heat source such as steam while being stirred by the paddle 3a.
The inside of the vacuum paddle dryer 3 is sucked by the steam ejector 4 to bring the inside into a substantially vacuum state. Molten tar is introduced near the outlet of the vacuum paddle dryer 3 through the tank 5 and the pump 6 and well stirred by the paddle 3a to cover the coal surface with tar. After that, coal is taken out from the vacuum paddle dryer 3 via the lock hopper 7 and sent to the slurry tank 8 to be used as CWM.
【0016】図2の改質装置では、低品位炭をミル10
で粉砕し、ロックホッパ11を介して減圧流動床反応器
12に導入する。減圧流動床反応器12内はスチームエ
ジェクタ13により吸引されると共に、スチーム等の熱
源により加熱されている。減圧流動床反応器12内に空
気を酸窒素分離器14で分離処理して得た窒素が導入さ
れる。減圧流動床反応器12内で流動乾燥処理された石
炭は、溶融タールの添加を受けた後、ロックホッパ15
に導入され、石炭表面がタールで覆われた後、スラリー
タンク16へ導入され、CWMとなる。CWMは部分酸
化ガス化炉17へ送られ、酸窒素分離器14からの酸素
によって部分的に酸化され、H2 、CO等のガスが生成
する。
In the reformer of FIG. 2, the low-grade coal is milled 10
It is pulverized in (1) and introduced into the reduced pressure fluidized bed reactor 12 via the lock hopper 11. The inside of the reduced pressure fluidized bed reactor 12 is sucked by the steam ejector 13 and heated by a heat source such as steam. Nitrogen obtained by separating air by the acid nitrogen separator 14 is introduced into the reduced pressure fluidized bed reactor 12. The coal which has been subjected to the fluidized drying treatment in the reduced pressure fluidized bed reactor 12 receives the addition of the molten tar and then the lock hopper 15
And the surface of the coal is covered with tar, and then introduced into the slurry tank 16 to become CWM. The CWM is sent to the partial oxidation gasification furnace 17, where it is partially oxidized by oxygen from the oxy-nitrogen separator 14 to generate gas such as H 2 and CO.
【0017】図3の改質装置では、低品位炭はミル20
で粉砕され、分配機21によって複数個(図3では4
個)の反応器22に分配供給される。この反応器22内
はスチームエジェクタ23により吸引され、ほぼ真空と
なっている。この反応器22内に溶融タールが添加さ
れ、石炭の表面がタールで覆われる。この石炭は回転式
回収機24によりスラリータンク25へ送られ、CWM
となる。
In the reformer of FIG. 3, the low-grade coal is mill 20.
It is crushed in the
Are supplied to the individual reactors 22. The inside of the reactor 22 is sucked by the steam ejector 23 and is in a substantially vacuum state. Molten tar is added into the reactor 22, and the surface of coal is covered with tar. This coal is sent to the slurry tank 25 by the rotary recovery machine 24, and the CWM
Becomes
【0018】[0018]
【実施例】【Example】
実施例1〜4、比較例1〜3 次の工業分析値を有する褐炭を本発明方法に従って改質
した。
Examples 1-4, Comparative Examples 1-3 Brown coal having the following industrial analysis values was modified according to the method of the present invention.
【0019】供試褐炭の工業分析値 全水分(TM) 34.1% 湿 分(IM) 17.5% 灰 分(A) 4.6% 揮発分(VM) 38.7% 固定炭素(FC) 39.2% 硫黄分(S) 1.91% 発熱量(CV) 5335cal/g まず、この褐炭を500μm以下に粉砕し、その20g
を真空加熱炉(電気炉)中にて0.5Torrで次の温
度で2時間加熱した。
Industrial analysis value of test lignite Total moisture (TM) 34.1% Moisture (IM) 17.5% Ash (A) 4.6% Volatile (VM) 38.7% Fixed carbon (FC ) 39.2% Sulfur content (S) 1.91% Calorific value (CV) 5335cal / g First, this brown coal was pulverized to 500 μm or less, and 20 g thereof
Was heated for 2 hours at the following temperature at 0.5 Torr in a vacuum heating furnace (electric furnace).
【0020】加熱温度 比較例1 170℃ 実施例1 180℃ 実施例2 200℃ 実施例3 220℃ 実施例4 230℃ 比較例2 250℃ 比較例3 270℃ 一旦、炉内を降温させた後、褐炭を取り出し、コールタ
ール0.3gを加熱処理された褐炭と軽く混合し、次い
で炉内に戻し、各例ごとに表1に示す温度に加熱してコ
ールタールで褐炭表面を覆った(コールタール処理)。
このとき、炉内を20気圧とした。
Heating Temperature Comparative Example 1 170 ° C. Example 1 180 ° C. Example 2 200 ° C. Example 3 220 ° C. Example 4 230 ° C. Comparative Example 2 250 ° C. Comparative Example 3 270 ° C. Once the temperature inside the furnace was lowered, The lignite was taken out, 0.3 g of coal tar was lightly mixed with the heat treated lignite, then returned to the furnace and heated to the temperature shown in Table 1 for each example to coat the lignite surface with the coal tar (coal tar. processing).
At this time, the pressure inside the furnace was set to 20 atm.
【0021】30分後、試料を取り出し、常温の水中に
48時間浸漬して吸水量を測定した。
After 30 minutes, the sample was taken out and immersed in water at room temperature for 48 hours to measure the amount of water absorption.
【0022】なお、比較のために、実施例1〜4及び比
較例1〜3においてコールタール処理する前の(褐炭を
170〜250℃で加熱処理しただけの)加熱処理褐炭
についても同様にして吸水量を測定した。
For comparison, the same applies to the heat-treated brown coal before the coal tar treatment in Examples 1 to 4 and Comparative Examples 1 to 3 (only the brown coal was heat-treated at 170 to 250 ° C.). The amount of water absorption was measured.
【0023】結果を表1に示す。なお、吸水量は、水中
に浸漬する前の石炭100gに対する水の吸収量(g−
水/100g−石炭)として表示してある。
The results are shown in Table 1. The amount of water absorbed is the amount of water absorbed (g-
It is shown as water / 100 g-coal).
【0024】表1に上記の乾燥による重量減少率も併せ
て示す。
Table 1 also shows the weight reduction rate due to the above-mentioned drying.
【0025】[0025]
【表1】 [Table 1]
【0026】表1より、本発明例によると乾燥が十分に
行われ、しかも吸水率が低く、揮発分の減少もきわめて
少ないことが明らかである。
From Table 1, it is clear that according to the examples of the present invention, the drying is sufficiently performed, the water absorption rate is low, and the reduction of volatile matter is extremely small.
【0027】比較例1は乾燥温度が低く、乾燥がやや不
足する。比較例2,3は、乾燥は十分であるが揮発分の
揮発も多いことが分る。
In Comparative Example 1, the drying temperature is low and the drying is slightly insufficient. It can be seen that in Comparative Examples 2 and 3, the drying is sufficient, but the volatilization of the volatiles is large.
【0028】次に、上記の実施例1〜4で得られたコー
ルタール処理後の褐炭粉末をそれぞれボールミル中で3
0分間撹拌することにより水中に分散させてCWMと
し、粘度を測定した。なお、石炭の濃度を50〜65%
の間で種々変えてCWMを試作した。そして、各実施例
において石炭濃度とCWMの粘度との関係を求めたとこ
ろ、次の表2の通りであった。
Next, the brown coal powders obtained in the above Examples 1 to 4 after the coal tar treatment were each mixed in a ball mill in an amount of 3 times.
It was dispersed in water by stirring for 0 minute to obtain CWM, and the viscosity was measured. The coal concentration should be 50-65%.
A CWM was experimentally manufactured with various changes. Then, when the relationship between the coal concentration and the viscosity of the CWM was determined in each example, the results are shown in Table 2 below.
【0029】[0029]
【表2】 [Table 2]
【0030】表2からも明らかな通り、各実施例のCW
Mは石炭濃度60〜65%の高濃度領域でも十分な流動
性を示している。これは、石炭粒子が水を殆ど吸水せ
ず、水が専ら石炭粒子同士の間に介在するためである。
As is clear from Table 2, the CW of each example
M shows sufficient fluidity even in the high concentration region where the coal concentration is 60 to 65%. This is because the coal particles hardly absorb water, and the water is present exclusively between the coal particles.
【0031】[0031]
【発明の効果】以上の通り、本発明の石炭の改質方法に
よると、従来よりも低い乾燥温度で石炭を乾燥させかつ
非吸水化処理することができる。従って、乾燥に伴う石
炭の揮発分の揮発が少なく、得られる燃料の発熱量も高
いものとなる。さらに、処理温度が低いため、操業が容
易となる。
As described above, according to the method for reforming coal of the present invention, it is possible to dry the coal at a lower drying temperature than before and to carry out the non-water absorption treatment. Therefore, the volatilization of coal volatiles is small due to drying, and the calorific value of the obtained fuel is also high. Further, since the processing temperature is low, the operation becomes easy.
【0032】本発明によると、このようにして改質され
た石炭から高濃度で高流動性のCWMを得ることができ
る。
According to the present invention, a CWM having a high concentration and a high fluidity can be obtained from the coal thus modified.
【図面の簡単な説明】[Brief description of drawings]
【図1】本発明方法を行うのに適した装置の系統図であ
る。
FIG. 1 is a systematic diagram of an apparatus suitable for carrying out the method of the present invention.
【図2】本発明方法を行うのに適した別の装置の系統図
である。
FIG. 2 is a system diagram of another apparatus suitable for carrying out the method of the present invention.
【図3】本発明方法を行うのに適したさらに別の装置の
系統図である。
FIG. 3 is a schematic diagram of yet another apparatus suitable for carrying out the method of the present invention.
【符号の説明】[Explanation of symbols]
1,10,20 ミル 3 真空パドルドライヤ 4,13,23 スチームエジェクタ 2,7,11,15 ロックホッパ 8,16,25 スラリータンク 17 ガス化炉 1,10,20 mil 3 Vacuum paddle dryer 4,13,23 Steam ejector 2,7,11,15 Lock hopper 8,16,25 Slurry tank 17 Gasification furnace

Claims (2)

    【特許請求の範囲】[Claims]
  1. 【請求項1】 粉砕した石炭を非酸化性雰囲気中で18
    0〜230℃に加熱して乾燥し、次いでタールを添加し
    て石炭粒子の表面に該タールを付着させる非吸水化処理
    を行うことを特徴とする石炭の改質方法。
    1. Crushed coal in a non-oxidizing atmosphere 18
    A method for reforming coal, which comprises heating to 0 to 230 ° C. to dry it, and then performing a non-water-absorption treatment in which tar is added to deposit the tar on the surface of the coal particles.
  2. 【請求項2】 石炭の粉末を請求項1の改質方法によっ
    て乾燥及び非吸水化処理し、次いで水に分散させること
    を特徴とするCWMの製造方法。
    2. A method for producing CWM, characterized in that coal powder is dried and non-water-absorbing treated by the reforming method of claim 1, and then dispersed in water.
JP12590696A 1996-05-21 1996-05-21 Modified coal production method, CWM and production method thereof, and H2 and CO production method Expired - Lifetime JP3941131B2 (en)

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US9476003B2 (en) 2008-04-15 2016-10-25 Clean Coal Technologies, Inc. Coal enhancement process
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JP2015040275A (en) * 2013-08-23 2015-03-02 三井造船株式会社 Charcoal slurry fuel and method and apparatus for production of the same
CN105004145A (en) * 2015-08-03 2015-10-28 天华化工机械及自动化研究设计院有限公司 2-benzothiazolethiol nitrogen circulation drying and solvent recovery method
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