JP2002066372A - Coal embrittlement method, coal pulverization method and coal combustion method using the same - Google Patents
Coal embrittlement method, coal pulverization method and coal combustion method using the sameInfo
- Publication number
- JP2002066372A JP2002066372A JP2000260953A JP2000260953A JP2002066372A JP 2002066372 A JP2002066372 A JP 2002066372A JP 2000260953 A JP2000260953 A JP 2000260953A JP 2000260953 A JP2000260953 A JP 2000260953A JP 2002066372 A JP2002066372 A JP 2002066372A
- Authority
- JP
- Japan
- Prior art keywords
- coal
- pressure
- embrittlement
- pulverized
- pores
- 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.)
- Pending
Links
- 239000003245 coal Substances 0.000 title claims abstract description 181
- 238000000034 method Methods 0.000 title claims description 40
- 238000010298 pulverizing process Methods 0.000 title claims description 28
- 238000009841 combustion method Methods 0.000 title description 3
- 239000011148 porous material Substances 0.000 claims abstract description 43
- 230000008859 change Effects 0.000 claims abstract description 26
- 229910052500 inorganic mineral Inorganic materials 0.000 claims abstract description 20
- 239000011707 mineral Substances 0.000 claims abstract description 20
- 238000000227 grinding Methods 0.000 claims description 3
- 230000035939 shock Effects 0.000 abstract description 2
- 239000007789 gas Substances 0.000 description 19
- 238000005516 engineering process Methods 0.000 description 13
- 239000002245 particle Substances 0.000 description 13
- 238000002485 combustion reaction Methods 0.000 description 11
- 239000000126 substance Substances 0.000 description 11
- 238000009826 distribution Methods 0.000 description 10
- 239000000463 material Substances 0.000 description 10
- 239000011882 ultra-fine particle Substances 0.000 description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- 238000004458 analytical method Methods 0.000 description 4
- 238000005336 cracking Methods 0.000 description 4
- 238000006073 displacement reaction Methods 0.000 description 4
- 238000000926 separation method Methods 0.000 description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 3
- 238000001816 cooling Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000005243 fluidization Methods 0.000 description 3
- 239000000446 fuel Substances 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 230000001737 promoting effect Effects 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 230000006837 decompression Effects 0.000 description 2
- 238000004200 deflagration Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 229910001873 dinitrogen Inorganic materials 0.000 description 2
- 239000002360 explosive Substances 0.000 description 2
- 239000010419 fine particle Substances 0.000 description 2
- 238000007710 freezing Methods 0.000 description 2
- 230000008014 freezing Effects 0.000 description 2
- 238000002309 gasification Methods 0.000 description 2
- 239000003921 oil Substances 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 239000002002 slurry Substances 0.000 description 2
- 238000009835 boiling Methods 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 230000003749 cleanliness Effects 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000018044 dehydration Effects 0.000 description 1
- 238000006297 dehydration reaction Methods 0.000 description 1
- 238000005115 demineralization Methods 0.000 description 1
- 230000002328 demineralizing effect Effects 0.000 description 1
- 230000001804 emulsifying effect Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 230000003116 impacting effect Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000010742 number 1 fuel oil Substances 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 238000000879 optical micrograph Methods 0.000 description 1
- 230000009257 reactivity Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000000523 sample Substances 0.000 description 1
- 238000001878 scanning electron micrograph Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 230000009291 secondary effect Effects 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 238000001665 trituration Methods 0.000 description 1
Landscapes
- Disintegrating Or Milling (AREA)
- Solid Fuels And Fuel-Associated Substances (AREA)
Abstract
(57)【要約】
【課題】 どの銘柄の石炭であっても容易に超微粉砕で
きるように脆化する。
【解決手段】 石炭に急激な圧力変化または温度変化若
しくはこれらの双方の変化による衝撃を与えることによ
り、石炭の細孔あるいは鉱物質と石炭質の界面からクラ
ックを生じさせる。圧力変化としては、例えば石炭を高
圧の雰囲気中に晒した後に急激に減圧する。
(57) [Summary] [Problem] To embrittle any kind of coal so that it can be easily micronized. SOLUTION: A shock is caused to a coal by an abrupt pressure change and / or a temperature change, thereby causing cracks from the pores of the coal or the interface between the mineral matter and the coal. As the pressure change, for example, after the coal is exposed to a high-pressure atmosphere, the pressure is rapidly reduced.
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、石炭を脆化する石
炭脆化方法およびこれを利用する石炭粉砕方法および石
炭燃焼方法に関する。さらに詳述すると、本発明は超微
粉砕を行うための石炭脆化方法および石炭粉砕方法およ
び石炭燃焼方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for embrittlement of coal, a method for pulverizing coal and a method for burning coal using the method. More specifically, the present invention relates to a coal embrittlement method, a coal pulverization method, and a coal combustion method for performing ultra-fine pulverization.
【０００２】[0002]
【従来の技術】石炭は、当面利用できる埋蔵量があり、
今後も利用して行かなければならないエネルギ資源であ
る。そして、我が国のエネルギセキュリティの観点か
ら、石炭は利用拡大を行わざるを得ない不可欠な燃料と
なっている。2. Description of the Related Art Coal has reserves available for the time being,
It is an energy resource that must be utilized in the future. And from the viewpoint of Japan's energy security, coal has become an indispensable fuel that must be expanded.
【０００３】石炭の燃焼方法としては、従来の塊炭のま
まの燃焼から微粉炭燃焼へと変遷して燃焼の効率向上を
図って来ており、近年では微粉炭粒径の超微粉化による
更なる燃焼効率の向上の技術が開発されている。また、
微粉炭の超微粉化は燃焼効率を高めるだけでなく、石炭
のハンドリング性を高める液化、ガス化、スラリー化な
どの流体化技術、あるいはクリーン化のための脱灰技術
において石炭の反応性等を高める上で必要な技術となっ
ている。[0003] As a method of burning coal, a transition from conventional lump coal combustion to pulverized coal combustion has been made to improve the efficiency of combustion. Technologies for improving combustion efficiency have been developed. Also,
Ultra-pulverization of pulverized coal not only enhances combustion efficiency, but also improves the reactivity of coal in liquefaction, gasification, slurry, and other fluidization technologies that improve coal handling, or in deashing technology for cleanliness. It is a necessary technology to enhance.
【０００４】[0004]
【発明が解決しようとする課題】しかしながら、微粉炭
はそのままではそれ以上粉砕され難く機械的外力を加え
て超微粉砕するには多大なエネルギを要してしまい、一
部の銘柄の石炭では必要なエネルギが大き過ぎて超微粉
砕が困難となってしまう。このような超微粉化が困難な
銘柄の石炭では、超微粉化による燃焼効率の向上が望め
ないだけでなく、流体化技術や脱灰技術等の新技術を適
用しても効果が小さい。このため、これらの新技術を適
用できる石炭は超微粉砕可能な一部の銘柄のものに限ら
れてしまっている。However, pulverized coal is hard to be further pulverized as it is, and requires a great deal of energy to apply a mechanical external force to perform ultra-fine pulverization. Energy is too large to make ultra-fine grinding difficult. With such a brand of coal that is difficult to ultra-pulverize, not only improvement in combustion efficiency due to ultra-pulverization cannot be expected, but even if a new technology such as fluidization technology or demineralization technology is applied, the effect is small. For this reason, the coal to which these new technologies can be applied is limited to some brands that can be finely pulverized.
【０００５】そこで、本発明は、どの銘柄の石炭であっ
ても容易に超微粉砕できるようにする石炭脆化方法およ
びこれを利用した石炭粉砕方法および石炭燃焼方法を提
供することを目的とする。Accordingly, an object of the present invention is to provide a coal embrittlement method for easily pulverizing any brand of coal, and a coal pulverization method and a coal combustion method using the same. .
【０００６】[0006]
【課題を解決するための手段】かかる目的を達成するた
めに本願発明者が石炭の断面を光学顕微鏡で観察した結
果、図２に示すように数多くの細孔が見られた。同図
中、細孔の一部は縦方向あるいは傾斜した方向の断面と
して撮影されている。そして、細孔を径によって分類し
て分布を見ると、図３に示すように孔径１００ｎｍ以上
で比較的少数のマクロ細孔Ｍａと、孔径１０ｎｍを超え
１００ｎｍ未満のメゾ細孔Ｍｅと、孔径１０ｎｍ以下で
非常に多数のミクロ細孔Ｍｉとの３種類に分けられる。
この石炭を走査電子顕微鏡（ＳＥＭ）で観察すると、図
４に示すようにマクロ細孔および若干のメゾ細孔が白く
長くクラック状に見られる。Means for Solving the Problems In order to achieve the above object, the inventors of the present invention have observed a cross section of coal with an optical microscope. As a result, many pores were found as shown in FIG. In the figure, a part of the pore is photographed as a cross section in a vertical direction or an inclined direction. When the pores are classified by diameter and the distribution is observed, as shown in FIG. 3, relatively few macropores Ma having a pore diameter of 100 nm or more, mesopores Me having a pore diameter of more than 10 nm and less than 100 nm, and a pore diameter of 10 nm In the following, it is classified into three types with a very large number of micropores Mi.
When this coal is observed with a scanning electron microscope (SEM), macropores and some mesopores are long and crack-like white as shown in FIG.
【０００７】また、石炭内部に分布する鉱物質を電子プ
ローブＸ線マイクロアナライザ（ＥＰＭＡ）で分析する
と、図５に示すＳＥＭ像部分において、石炭内部に混在
する鉱物質の代表的な物質であるケイ素（Ｓｉ）、アル
ミニウム（Ａｌ）、鉄（Ｆｅ）の分布が図６〜図８に示
すチャートとして得られた。これらの結果によると、鉱
物質がマクロ細孔やメゾ細孔に集中して存在するのが観
察されると共に、極く微量ながら内部全体に広く点在し
ていることが分かる。よって、石炭質と鉱物質の界面は
マクロ細孔やメゾ細孔の周辺に多く存在しており、界面
のずれや剥離が微粉炭の超微粉砕に大きく寄与すること
が分かる。[0007] When the minerals distributed inside the coal are analyzed by an electron probe X-ray microanalyzer (EPMA), the SEM image shown in FIG. The distributions of (Si), aluminum (Al), and iron (Fe) were obtained as charts shown in FIGS. According to these results, it is observed that the mineral substance is concentrated in the macropores and the mesopores, and that the mineral substance is widely scattered throughout the inside, though it is extremely small. Therefore, it can be seen that the interface between the coal material and the mineral substance is often present around the macropores and the mesopores, and that the displacement and separation of the interface greatly contribute to the ultra-fine pulverization of the pulverized coal.
【０００８】一般に、石炭を平均径（５０％代表径）Ｄ
ｐ５０＝３０〜４０μｍの微粉炭に粉砕すると、３種類
の細孔のうちのマクロ細孔からの割れや破砕などが中心
となって粉砕され、メゾ細孔およびミクロ細孔は石炭の
内部に閉じ込められたままになる。そして、この微粉炭
を角取り粉砕による粉砕装置（特開平１１−２８３７５
号公報参照）を用いて再度粉砕すると、微粉炭の角張っ
ている角が削り取られて超微粒子が生成するのと共に、
超微粉砕可能な一部の石炭ではメゾ細孔から割れや破砕
などが生じて再粉砕されて超微粒子化された。In general, coal has an average diameter (50% representative diameter) D
Trituration in p 50 = 30 to 40 .mu.m of pulverized coal, such as cracking and breaking of the macropores of the three types of pores are crushed at the heart, mesoporous and micropores inside the coal Remain trapped. The pulverized coal is pulverized by crushing and pulverizing (JP-A-11-28375).
When pulverized coal is pulverized again, the sharp corners of the pulverized coal are scraped off to produce ultrafine particles,
Some of the coals that can be finely pulverized were cracked or crushed from the mesopores and re-pulverized into ultrafine particles.
【０００９】これに対し、超微粉炭を生成し難い一部の
銘柄の石炭では、角取り粉砕装置を用いた粉砕を行って
も超微粒子の生成量は少なく平均径Ｄｐ５０は３０〜４
０μｍよりも余り小さくならない。その理由として、こ
の種の石炭を微粉炭にすると、図１（Ａ）に示すように
マクロ細孔を極く僅かしか有していないと共にメゾ細孔
は短く小さいので、これらの細孔からの割れや破砕によ
る超微粉砕が困難であることが考えられる。また、この
種の石炭では、細孔周囲の石炭質や鉱物質自体が強い構
造を持っていて割れや破砕が生じ難いことや、石炭質お
よび鉱物質の界面の結合が強く両面のずれや剥離が起き
難いことが考えられる。[0009] In contrast, in the coal produced hard part stocks micronized coal, the average diameter Dp 50 least be pulverized production of ultrafine particles with chamfers grinding apparatus 30-4
It does not become much smaller than 0 μm. The reason is that when this kind of coal is pulverized coal, as shown in FIG. 1 (A), it has very few macropores and short and small mesopores. It is considered that ultrafine pulverization by cracking or crushing is difficult. In addition, in this type of coal, the coal material and the mineral substance around the pores have a strong structure, which makes it difficult for cracking and crushing to occur. Is unlikely to occur.
【００１０】かかる知見に基づいて発明された請求項１
記載の石炭脆化方法は、石炭に急激な圧力変化または温
度変化若しくはこれらの双方の変化による衝撃を与える
ことにより、石炭の細孔あるいは鉱物質と石炭質の界面
からクラックを生じさせるようにしている。[0010] Claim 1 was invented based on such knowledge.
The described coal embrittlement method is intended to generate a crack from the pores of the coal or the interface between the mineral matter and the coal by subjecting the coal to an impact due to a sudden pressure change and / or a temperature change. I have.
【００１１】したがって、図１（Ａ）に示すような石炭
の細孔あるいは鉱物質および石炭質の界面に衝撃を与え
て、図１（Ｂ）に示すように数多くのクラックを発生さ
せるようにしているので、脆化した石炭に機械的外力を
与えればクラックから容易に割れや破砕を生ずるように
なる。このため、超微粉砕し難い石炭であっても砕け易
くなり、容易に超微粉砕できるようになる。Therefore, impact is exerted on the pores of the coal as shown in FIG. 1 (A) or on the interface between the mineral matter and the coalaceous material so that many cracks are generated as shown in FIG. 1 (B). Therefore, if a mechanical external force is applied to the brittle coal, cracking or crushing easily occurs from the crack. For this reason, even coal that is difficult to be ultra-finely pulverized is easily crushed and can be easily ultra-finely pulverized.
【００１２】そして、石炭に急激な圧力変化を与える場
合は、細孔の内外に大きな圧力差が生じるので、細孔が
拡張または圧縮されてクラックを生ずる。また、石炭に
急激な温度変化を与える場合は、石炭質および鉱物質の
熱膨張率の差によりこれらの界面のずれや剥離を引き起
こすのに加えて、細孔の内部に含有された水分が膨張し
て細孔にクラックを生じさせる。これらのように、石炭
に各種の衝撃による物理的刺激を与えて数多くのクラッ
クを発生させることができるので、石炭を脆化すること
ができる。When a sudden pressure change is applied to coal, a large pressure difference is generated between the inside and outside of the pores, and the pores are expanded or compressed to cause cracks. In addition, when a rapid temperature change is applied to coal, the difference in thermal expansion coefficient between coal and minerals causes displacement and separation of these interfaces, and in addition, water contained inside the pores expands. This causes cracks in the pores. As described above, since a large number of cracks can be generated by giving physical stimulus to the coal by various impacts, the coal can be embrittled.
【００１３】ここで、圧力変化を与えるときは、請求項
２記載の石炭脆化方法のように石炭を高圧の雰囲気中に
晒した後に急激に減圧することが好ましい。この場合、
急激な減圧により、細孔内に圧入されていた空気等のガ
スが細孔から瞬時に抜け出せずに細孔を拡大するよう作
用し、細孔の拡大に伴ってクラックの発生あるいは成長
が促されて脆化が容易になる。また、細孔拡大の力を受
けて石炭質と鉱物質の界面がずれたりあるいは剥離を起
こし、クラックの発生および成長が促進されることによ
っても脆化が容易になる。Here, when the pressure is changed, it is preferable that the coal is exposed to a high-pressure atmosphere and then the pressure is rapidly reduced as in the coal embrittlement method. in this case,
Due to the rapid decompression, gas such as air that has been injected into the pores acts to expand the pores without instantaneous escape from the pores, thereby promoting the generation or growth of cracks as the pores expand. Embrittlement is facilitated. In addition, the interface between the coal material and the mineral substance is displaced or peeled by the force of pore expansion, and the generation and growth of cracks are promoted, so that embrittlement is facilitated.
【００１４】また、急激に減圧するためには、例えば高
圧雰囲気に晒した石炭を急に大気圧に解放する。このと
きに与える気圧差は大きければ大きいほどクラックの発
生には効果的であるが、高圧雰囲気として３気圧を超え
るようにすると圧縮装置が大掛かりになり経済性が悪く
なるので３気圧以下にすることが好ましい。In order to rapidly reduce the pressure, for example, coal exposed to a high-pressure atmosphere is suddenly released to the atmospheric pressure. The greater the pressure difference applied at this time, the more effective it is for the generation of cracks. However, if the pressure exceeds 3 atm as a high-pressure atmosphere, the compressor becomes large and the economical efficiency deteriorates. Is preferred.
【００１５】さらに、圧力変化を与える態様としては急
激に加圧するものもある。この場合、外気が石炭の細孔
に入り込もうとするが、瞬時には入り込めないので、細
孔を押し潰すよう作用する。そして、細孔が圧縮される
ことによりクラックの発生あるいは成長を促すことがで
きる。また、外部からの圧力により石炭質と鉱物質の界
面がずれたりあるいは剥離を起こし、クラックの発生お
よび成長を促進することもある。これらの相乗作用によ
り石炭が脆化される。Further, as a mode for giving a pressure change, there is a mode in which pressure is rapidly applied. In this case, the outside air tries to enter the pores of the coal, but cannot enter instantaneously, and acts to crush the pores. Then, generation or growth of cracks can be promoted by the compression of the pores. In addition, the interface between the coal material and the mineral substance may shift or separate due to external pressure, which may promote the generation and growth of cracks. These synergistic effects embrittle the coal.
【００１６】また、急激に加圧するためには、例えば低
圧雰囲気に晒した石炭を急に大気圧に解放する。このと
きに与える気圧差は大きければ大きいほどクラックの発
生には効果的であるが、低圧雰囲気として余りに高真空
にしようとすると減圧装置が大掛かりになり経済性が悪
くなるので、経済性を考慮して真空度を設定することが
好ましい。そして、大気圧を超える圧力に急激に加圧す
ることもできる。For rapid pressurization, for example, coal exposed to a low-pressure atmosphere is suddenly released to the atmospheric pressure. The greater the pressure difference applied at this time, the more effective it is for the generation of cracks.However, if an attempt is made to make the vacuum too low as a low-pressure atmosphere, the decompression device will be large-scale and the economics will worsen. It is preferable to set the degree of vacuum. Then, the pressure can be rapidly increased to a pressure exceeding the atmospheric pressure.
【００１７】そして、温度変化を与える態様としては急
激に加熱するものがある。この場合、石炭質および鉱物
質の熱膨張率の差と熱伝導率の違いによる温度上昇の速
度差との相乗作用により、石炭質および鉱物質の界面の
ずれや剥離を引き起こす。これに加えて、細孔の内部に
含有された水分が沸騰して蒸気になったりガスが膨張し
て細孔のクラック発生を促進するという副次的効果もあ
る。このため、仮に熱膨張率の差だけを考慮すると温度
差としては例えば２００〜３００℃、あるいは数百℃は
必要になると考えられるが、現実には熱伝導率の差や水
分およびガスの膨張があるので例えば１４０℃程度でも
脆化可能である。As a mode for giving a temperature change, there is a mode in which heating is performed rapidly. In this case, the synergy between the difference in the thermal expansion coefficient between the coal and the mineral and the difference in the rate of temperature rise due to the difference in the thermal conductivity causes the interface and the separation of the interface between the coal and the mineral. In addition to this, there is also a secondary effect that the water contained in the pores boils and turns into steam or the gas expands to promote the generation of cracks in the pores. For this reason, if only the difference in the coefficient of thermal expansion is taken into account, it is considered that a temperature difference of, for example, 200 to 300 ° C. or several hundred ° C. is required. Therefore, it can be embrittled even at about 140 ° C., for example.
【００１８】また、温度変化を与える態様としては急激
に冷却するものがある。この場合、熱膨張率の差と熱伝
導率の違いによる界面のずれや剥離に加えて、細孔の内
部に含有された水分が凍結して膨張して細孔のクラック
発生を促進する。但し、凍結による体積膨張は沸騰によ
る膨張よりも膨張率が小さいことと水の低温下による結
晶構造によっては氷が緻密化されることから、例えば常
温から−１０〜−５０℃程度にまで冷却すれば十分であ
り、さらに下げても余り効果はない。このため、この温
度まで下げても脆化の見られない石炭種については他の
態様で脆化を図るようにする。As a mode for giving a temperature change, there is a mode in which the temperature is rapidly cooled. In this case, in addition to the displacement and peeling of the interface due to the difference in the thermal expansion coefficient and the difference in the thermal conductivity, the moisture contained in the pores freezes and expands to promote the generation of cracks in the pores. However, since the volume expansion due to freezing is smaller than the expansion rate due to boiling and the ice is densified depending on the crystal structure due to the low temperature of water, cooling from room temperature to about −10 to −50 ° C. Is sufficient, and lowering it has little effect. For this reason, coal types that do not show embrittlement even when the temperature is lowered to this temperature are embrittled in another manner.
【００１９】ところで、上述した急激な圧力変化あるい
は温度変化では、単に変化量の大きさだけでなく、単位
時間当たりの変化量、即ち変化の速さも重要である。例
えば圧力変化の場合は気圧差が０．５気圧程度であって
も、圧力変化速度を十分に速くすればクラックを生じさ
せて脆化することが可能である。Incidentally, in the above-mentioned rapid pressure change or temperature change, not only the magnitude of the amount of change but also the amount of change per unit time, that is, the speed of change is important. For example, in the case of a pressure change, even if the pressure difference is about 0.5 atm, if the pressure change speed is sufficiently high, cracks can be generated and the material can be embrittled.
【００２０】一方、請求項３記載の石炭粉砕方法は、石
炭に機械的外力を与えて粉砕する石炭粉砕方法におい
て、石炭は請求項１または２記載の石炭脆化方法により
脆化されてから粉砕されるようにしている。したがっ
て、石炭は上述した石炭脆化方法により脆化されている
ので、容易に超微粉砕することができる。According to a third aspect of the present invention, there is provided a method of pulverizing coal by applying a mechanical external force to pulverized coal, wherein the coal is pulverized after being embrittled by the first method. I am trying to be. Therefore, since the coal has been embrittled by the above-described coal embrittlement method, it can be easily micronized.
【００２１】また、請求項４記載の石炭燃焼方法は、請
求項１または２記載の前記石炭脆化方法により脆化した
微粉炭を微粉炭バーナにより燃焼するようにしている。
したがって、脆化した微粉炭を超微粉砕することなくバ
ーナから噴霧して燃焼させることができ、脆化によって
発生したクラック部を基点とした爆燃を引き起こすこと
ができる。このため、石炭粒子は爆発的に極く細かく割
れて超微粒子級の粒径となって燃え、超微粉砕したもの
を噴霧燃焼させる場合と同様な燃焼効率を得ることがで
きる。According to a fourth aspect of the present invention, there is provided a coal burning method wherein the pulverized coal embrittled by the coal embrittlement method according to the first or second aspect is burned by a pulverized coal burner.
Therefore, the embrittled pulverized coal can be sprayed and burned from the burner without being super-pulverized, and deflagration can be caused based on the crack portion generated by the embrittlement. For this reason, the coal particles explosively break into extremely fine particles, burn to a particle size of ultrafine particles, and can achieve the same combustion efficiency as in the case of spray-burning the ultrafinely pulverized material.
【００２２】[0022]
【発明の実施の形態】以下、本発明の構成を図面に示す
実施の形態の一例に基づいて詳細に説明する。本発明の
石炭脆化方法は、石炭に急激な圧力変化または温度変化
若しくはこれらの双方の変化による衝撃を与えることに
より、石炭の細孔あるいは鉱物質と石炭質の界面からク
ラックを生じさせるようにしている。このため、石炭の
細孔あるいは鉱物質および石炭質の界面に衝撃を与えて
数多くのクラックを発生させるようにしているので、脆
化した石炭に機械的外力を与えればクラックから容易に
割れや破砕を生ずるようになる。よって、超微粉砕し難
い石炭であっても砕け易くなり、容易に超微粉砕できる
ようになる。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The configuration of the present invention will be described below in detail based on an example of an embodiment shown in the drawings. The coal embrittlement method of the present invention is intended to generate cracks from the pores of coal or the interface between mineral matter and coal by subjecting coal to sudden pressure changes and / or impacts due to temperature changes. ing. For this reason, a large number of cracks are generated by impacting the pores of the coal or the interface between the mineral matter and the coalaceous material, so if a mechanical external force is applied to the embrittled coal, it will be easily cracked or crushed from the cracks Will occur. Therefore, even coal which is hard to be finely pulverized is easily crushed and can be easily finely pulverized.
【００２３】石炭に与える衝撃としては、例えば急激な
圧力変化とすることができる。これにより、石炭の細孔
の内外に大きな圧力差が生じるので、細孔が拡張または
圧縮されてクラックを生ずるようになる。The impact applied to the coal may be, for example, a sudden pressure change. As a result, a large pressure difference is generated between the inside and outside of the pores of the coal, and the pores are expanded or compressed to cause cracks.
【００２４】この石炭脆化方法を実施する石炭脆化装置
１は、例えば図９に示すように高い内圧に耐え得る容器
２と、該容器２を密封可能な蓋体３と、容器２に高圧ガ
スを供給する給気手段４とを備えるものとしている。A coal embrittlement apparatus 1 for carrying out this coal embrittlement method includes, as shown in FIG. 9, a container 2 capable of withstanding a high internal pressure, a lid 3 capable of sealing the container 2, and a high pressure container And gas supply means 4 for supplying gas.
【００２５】容器２は例えば円筒形状で、一方の端部は
閉塞されると共に他方の端部は開放されている。蓋体３
は円盤状で、容器２の開放された端部に蝶番等により開
閉可能に取り付けられている。蓋体３を閉じたときに
は、容器２の内部に高圧ガスを密封するようにしてい
る。The container 2 has, for example, a cylindrical shape, and one end is closed and the other end is open. Lid 3
Has a disk shape, and is attached to the open end of the container 2 by a hinge or the like so as to be opened and closed. When the lid 3 is closed, the inside of the container 2 is sealed with high-pressure gas.
【００２６】そして、給気手段４は、容器２の一部に取
り付けられた供給管５と、該供給管５に設けられた開閉
弁６および圧力計７と、供給管５を通して容器２に高圧
ガス８を注入する供給源（図示せず）とを備えている。
ここでの高圧ガス８としては例えば窒素ガスを使用して
いる。高圧ガス８としては炭酸ガス等を使用しても良
い。The supply means 4 includes a supply pipe 5 attached to a part of the container 2, an on-off valve 6 and a pressure gauge 7 provided on the supply pipe 5, and a high-pressure supply to the container 2 through the supply pipe 5. A supply source (not shown) for injecting the gas 8.
Here, for example, nitrogen gas is used as the high-pressure gas 8. Carbon dioxide gas or the like may be used as the high-pressure gas 8.
【００２７】上述した石炭脆化装置１により石炭９を脆
化する手順を以下に説明する。The procedure for embrittlement of the coal 9 by the above-mentioned coal embrittlement apparatus 1 will be described below.
【００２８】図９（Ａ）に示すように、有る程度細かく
した石炭（微粉炭）９を容器２に入れて蓋体３を閉じ
る。このときの石炭９は、図１（Ａ）に示すようにメゾ
細孔とミクロ細孔が多く見られるものの、マクロ細孔は
殆ど無いものである。そして、開閉弁６を開いて高圧ガ
ス８を容器２内に供給する。容器２内が３〜７気圧程度
に成ったら、開閉弁６を閉じる。これにより、石炭９が
高圧の雰囲気中に晒されて細孔に高圧ガス８が充填され
る。As shown in FIG. 9 (A), the coal (pulverized coal) 9 which has been reduced to a certain degree is put in the container 2 and the lid 3 is closed. At this time, the coal 9 has many mesopores and micropores as shown in FIG. 1A, but has almost no macropores. Then, the on-off valve 6 is opened to supply the high-pressure gas 8 into the container 2. When the pressure in the container 2 reaches about 3 to 7 atm, the on-off valve 6 is closed. Thereby, the coal 9 is exposed to the high-pressure atmosphere, and the high-pressure gas 8 is filled in the pores.
【００２９】そして、図９（Ｂ）に示すように蓋体３を
覆うように容器２に袋体１０を取り付けて、蓋体３を一
気に開く。これにより、容器２内から高圧ガス８と共に
石炭９が噴き出して袋体１０に捕集される。このとき、
石炭９が急激に減圧され、メゾ細孔やミクロ細孔内に圧
入されていた高圧ガスが細孔から瞬時に抜け出せずに細
孔を拡大するよう作用し、細孔の拡大に伴って図１
（Ｂ）に示すようにクラックの発生あるいは成長を促
す。また、細孔拡大の力を受けて石炭質と鉱物質の界面
がずれたりあるいは剥離を起こし、クラックの発生およ
び成長を促進する。そして、内部に生じたクラックによ
り石炭粒子の見掛け上の体積は大きくなるが、空隙を多
数包含することになるので脆化される。Then, as shown in FIG. 9B, the bag 10 is attached to the container 2 so as to cover the cover 3, and the cover 3 is opened at a stretch. Thus, the coal 9 is spouted out of the container 2 together with the high-pressure gas 8 and collected in the bag 10. At this time,
The pressure of the coal 9 is rapidly reduced, and the high-pressure gas injected into the mesopores or micropores acts to expand the pores without instantaneously coming out of the pores.
Crack generation or growth is promoted as shown in FIG. In addition, the interface between the coal and the mineral substance shifts or separates due to the force of pore expansion, thereby promoting the generation and growth of cracks. The apparent volume of the coal particles increases due to the cracks generated therein, but the coal particles are embrittled because they contain many voids.
【００３０】こうして得られた石炭に例えばミルやロー
ラ等で機械的外力を与えて粉砕することにより、容易に
超微粉砕することができる。よって、例えば従来は超微
粉砕が困難で高濃度石炭・水混合燃料（ＣＷＭ）や高濃
度石炭・油混合燃料（ＣＯＭ）に使用できないいわゆる
低品位炭であっても、脆化して超微粉砕することにより
高品位化してＣＷＭやＣＯＭに利用することができるよ
うになる。The thus obtained coal is pulverized by applying a mechanical external force with a mill or a roller, for example, so that it can be easily ultrafinely pulverized. Therefore, for example, so-called low-grade coal which cannot be used for high-concentration coal-water mixed fuel (CWM) or high-concentration coal-oil mixed fuel (COM) because it is conventionally difficult to ultra-pulverize is embrittled and ultra-pulverized. By doing so, it is possible to improve the quality and use it for CWM and COM.
【００３１】一方、上述した石炭脆化方法により脆化し
た微粉炭を粉砕することなく微粉炭バーナにより燃焼す
るようにしても良い。この場合、脆化した微粉炭をバー
ナから噴霧して燃焼させることができ、脆化によって発
生したクラック部を基点とした爆燃を引き起こすことが
できる。このため、石炭粒子は爆発的に極く細かく割れ
て超微粒子級の粒径となって燃え、超微粉砕したものを
噴霧燃焼させる場合と同様な燃焼効率を得ることができ
る。On the other hand, the pulverized coal embrittled by the coal embrittlement method described above may be burned by a pulverized coal burner without being pulverized. In this case, the embrittled pulverized coal can be sprayed from the burner and burned, and deflagration can be caused based on the crack generated by the embrittlement. For this reason, the coal particles explosively break into extremely fine particles, burn to a particle size of ultrafine particles, and can achieve the same combustion efficiency as in the case of spray-burning the ultrafinely pulverized material.
【００３２】なお、上述の実施形態は本発明の好適な実
施の一例ではあるが、これに限定されるものではなく本
発明の要旨を逸脱しない範囲において種々変形実施可能
である。例えば本実施形態では石炭を急激に減圧するた
めに高圧ガスを封入した容器２の蓋体３を急に開放して
いるが、これには限られず高圧ガスを封入した容器２の
開閉弁６を急に解放して高圧ガスを逃がすようにしても
良い。Although the above embodiment is an example of a preferred embodiment of the present invention, the present invention is not limited to this embodiment, and various modifications can be made without departing from the gist of the present invention. For example, in this embodiment, the lid 3 of the container 2 in which the high-pressure gas is sealed is suddenly opened in order to rapidly reduce the pressure of the coal. However, the present invention is not limited to this. You may make it release suddenly and let high-pressure gas escape.
【００３３】また、本実施形態では石炭に与える急激な
圧力変化を急な減圧としているが、これには限られず急
な加圧としても良い。例えば図９に示す容器２を使用す
る場合は、石炭９を入れて蓋体３を閉じた状態で容器２
内を減圧した後、蓋体３を一気に開くようにする。これ
により、外気が容器２内に吹き込んで石炭９の細孔に入
り込もうとするが、瞬時には入り込めないので、細孔を
押し潰すよう作用する。よって、細孔の圧縮に伴ってク
ラックの発生あるいは成長を促す。また、外部からの圧
力により石炭質と鉱物質の界面がずれたりあるいは剥離
を起こし、クラックの発生および成長を促進することも
ある。これにより、石炭９が脆化される。Further, in the present embodiment, the rapid pressure change applied to the coal is a sudden pressure reduction, but the present invention is not limited to this, and the pressure may be abruptly increased. For example, when the container 2 shown in FIG. 9 is used, the container 2 is filled with the coal 9 and the cover 3 is closed.
After the inside is depressurized, the lid 3 is opened at a stretch. As a result, the outside air blows into the container 2 and tries to enter the pores of the coal 9, but cannot enter instantaneously, and acts to crush the pores. Therefore, the generation or growth of cracks is promoted as the pores are compressed. In addition, the interface between the coal material and the mineral substance may shift or separate due to external pressure, which may promote the generation and growth of cracks. Thereby, the coal 9 is embrittled.
【００３４】また、石炭に急激な加圧を行う方法として
は、上述のように先に減圧しておき大気に解放する方法
の他に、圧縮装置等の利用により容器２に急激に空気を
送り込む方法や、あるいは容器２内で少量の火薬を爆発
させて瞬時に爆圧を与える方法などを採用することがで
きる。いずれの場合も石炭の細孔を押し潰してクラック
の発生と成長を促すことができる。As a method for rapidly pressurizing the coal, in addition to the above-described method in which the pressure is firstly reduced and then released to the atmosphere, air is rapidly sent into the container 2 by using a compression device or the like. It is possible to employ a method or a method in which a small amount of explosive is exploded in the container 2 to instantaneously apply an explosive pressure. In any case, the generation and growth of cracks can be promoted by crushing the pores of the coal.
【００３５】また、上述した実施形態では圧力の急下降
と急上昇の一方のみを行っているが、これには限られず
両方を順に行うようにしても良い。この場合、脆化を更
に促進することができる。Further, in the above-described embodiment, only one of the rapid decrease and the rapid increase of the pressure is performed, but the present invention is not limited to this, and both may be performed in order. In this case, embrittlement can be further promoted.
【００３６】さらに、上述した各実施形態では石炭に急
激な圧力変化を与えているが、これには限られず急激な
温度変化を与えるようにしても良い。すなわち、例えば
熱水または１４０℃程度の熱油あるいは熱ガスにより急
加熱を行ったり、冷水または冷油あるいは冷ガスにより
急冷却を行ったりして、温度衝撃を与えるようにする。
これらの急加熱と急冷却はいずれか一方でも良く、ある
いは両方を順に行うようにしても良い。これにより、石
炭質および鉱物質の熱膨張率の差と熱伝導率の違いによ
る界面のずれや剥離に加えて、細孔の内部に含有された
水分やガスが蒸発や凍結により膨張して細孔のクラック
発生を促進して、石炭を脆化することができる。Furthermore, in each of the above-described embodiments, a rapid pressure change is applied to coal. However, the present invention is not limited to this, and a rapid temperature change may be applied. That is, for example, rapid heating is performed using hot water or hot oil or hot gas at about 140 ° C., or rapid cooling is performed using cold water, cold oil, or cold gas to apply a temperature shock.
Either one of these rapid heating and rapid cooling may be performed, or both may be sequentially performed. As a result, in addition to the displacement and separation of the interface due to the difference in the coefficient of thermal expansion and the difference in the thermal conductivity of the coal and mineral substances, the moisture and gas contained inside the pores expand due to evaporation and freezing and become fine. The coal can be embrittled by promoting cracks in the holes.
【００３７】また、上述した各実施形態では石炭に急激
な圧力変化または温度変化のうちの一方のみを与えてい
るが、これには限られずこれらの双方を組み合わせて与
えるようにしても良い。このように複合的な衝撃から成
る物理的刺激を石炭に与えて数多くのクラックを発生さ
せることにより、より効果的に石炭を脆化することがで
きる。Further, in each of the above-mentioned embodiments, only one of a sudden pressure change and a temperature change is given to coal, but the present invention is not limited to this, and a combination of both of them may be given. By giving a physical stimulus consisting of multiple impacts to the coal to generate a large number of cracks, the coal can be more effectively embrittled.
【００３８】ところで、上述した各実施形態では石炭を
脆化して超微粉砕するに止まっているが、これには限ら
れず液化、ガス化、スラリー化の流体化工程や脱灰工
程、更にはこれらの工程の前に必要によって行う脱水工
程等の他の工程と組み合わせて脆化および超微粉砕する
ようにしても良い。By the way, in each of the above-mentioned embodiments, coal is embrittled and only ultra-fine pulverization is performed. However, the present invention is not limited to this, and liquefaction, gasification, slurry fluidization process and deashing process, and furthermore, Embrittlement and ultrafine pulverization may be performed in combination with other steps such as a dehydration step performed as necessary before the step.
【００３９】[0039]
【実施例】脆化処理を施した石炭と施さない石炭とにつ
いて超微粉砕の度合いを測定した。粒径３０〜５０ｍｍ
のバルク炭を機械的に粉砕して微粉炭を得た。この微粉
炭を「超微粉砕前の石炭」とした。EXAMPLES The degree of ultra-fine pulverization was measured for coal subjected to embrittlement and coal not subjected to embrittlement. Particle size 30-50mm
Was mechanically pulverized to obtain pulverized coal. This pulverized coal was referred to as “coal before ultrafine pulverization”.
【００４０】この超微粉砕前の石炭の粒径分布の測定結
果を図１０の曲線Ｐに示す。同図に示すようにＤｐ５０
≒８０μｍであった。また、この石炭を走査型電子顕微
鏡で観察した。その結果を図１（Ａ）に示す。The measurement result of the particle size distribution of the coal before the ultrafine pulverization is shown by a curve P in FIG. Dp 50 as shown in FIG.
≒ 80 μm. This coal was observed with a scanning electron microscope. The results are shown in FIG.
【００４１】（実施例）図９に示す石炭脆化装置１を利
用して、上述した超微粉砕前の石炭９を容器２に入れて
蓋体３を閉じ、高圧の窒素ガス８により常温で３気圧程
度に加圧した。その後、蓋体３を一気に開放して急激に
減圧して石炭９を脆化した。この脆化後の石炭９を走査
型電子顕微鏡で観察した。その結果を図１（Ｂ）に示
す。図１の（Ａ）と（Ｂ）を比較することにより、石炭
に脆化処理を施すことによってクラックの発生および成
長が促進されることが明らかとなった。(Embodiment) Using the coal embrittlement apparatus 1 shown in FIG. 9, the above-mentioned coal 9 before ultra-fine pulverization is put into the container 2, the lid 3 is closed, and the high-pressure nitrogen gas 8 is used at room temperature. The pressure was increased to about 3 atm. Thereafter, the lid 3 was opened at a stretch and the pressure was rapidly reduced to embrittle the coal 9. The coal 9 after this embrittlement was observed with a scanning electron microscope. The results are shown in FIG. By comparing (A) and (B) of FIG. 1, it became clear that the generation and growth of cracks were promoted by subjecting the coal to embrittlement treatment.
【００４２】また、脆化後の石炭を角取り粉砕装置によ
り粉砕した。脆化粉砕後の石炭の粒径分布の測定結果を
図１０の曲線Ｑに示す。同図に示すようにＤｐ５０≒４
μｍであった。よって、石炭は十分に超微粉砕されたこ
とが判明した。Further, the brittle coal was pulverized by a chamfering pulverizer. The measurement result of the particle size distribution of the coal after embrittlement and pulverization is shown by a curve Q in FIG. As shown in the figure, Dp 50 ≒ 4
μm. Therefore, it was found that the coal was sufficiently pulverized.
【００４３】（比較例）超微粉砕前の石炭をそのまま角
取り粉砕装置により粉砕した。粉砕後の石炭の粒径分布
の測定結果を図１０の曲線Ｒに示す。同図に示すように
Ｄｐ５０≒１７μｍであった。(Comparative Example) Coal before ultra-fine pulverization was pulverized as it is by a square pulverizer. The measurement result of the particle size distribution of the pulverized coal is shown by a curve R in FIG. As shown in the figure, Dp 50 ≒ 17 μm.
【００４４】したがって、石炭を脆化することにより、
脆化しない場合に比べて超微粉砕されることが明らかと
なった。Therefore, by emulsifying coal,
It was clarified that the particles were pulverized as compared with the case without embrittlement.
【００４５】[0045]
【発明の効果】以上の説明より明らかなように、請求項
１記載の石炭脆化方法によれば、超微粉砕の比較的困難
な種類の石炭、特に微粉炭であっても脆化することがで
きるので、超微粉砕を容易にすることができる。このた
め、超微粉化により燃焼効率を高めることができると共
に、液体化技術や脱灰技術などの石炭新利用技術の開発
といった超微粉砕を必要とする技術に寄与することがで
きる。また、新利用技術用炭として不適切とされていた
超微粉砕の困難な一部の銘柄炭を使用することができる
ようになるので、エネルギ資源の有効利用を拡大するこ
とができる。As is apparent from the above description, according to the coal embrittlement method of the first aspect, even coal of a type that is relatively difficult to ultra-pulverize, particularly pulverized coal, is embrittled. Therefore, ultra-fine pulverization can be facilitated. For this reason, the combustion efficiency can be enhanced by the ultra-fine pulverization, and it is possible to contribute to a technology that requires ultra-fine pulverization, such as the development of a new coal utilization technology such as a liquefaction technology and a deashing technology. In addition, since it is possible to use some brand-name coals which are considered unsuitable as new-use technology coals and which are difficult to pulverize, the effective use of energy resources can be expanded.
【００４６】また、請求項２記載の石炭脆化方法によれ
ば、細孔の拡大あるいは石炭質と鉱物質の界面のずれ及
び剥離によって、クラックの発生および成長を促進する
ことができ、脆化が容易になり効率を高めることができ
る。According to the coal embrittlement method according to the second aspect, the generation and growth of cracks can be promoted by enlarging the pores or displacing and exfoliating the interface between the coal substance and the mineral substance. And the efficiency can be increased.
【００４７】一方、請求項３記載の石炭粉砕方法によれ
ば、石炭は脆化されているので容易に超微粉砕すること
ができる。On the other hand, according to the method for pulverizing coal according to the third aspect, since the coal is embrittled, it can be easily ultra-pulverized.
【００４８】そして、請求項４記載の石炭燃焼方法によ
れば、脆化した微粉炭を超微粉砕することなくバーナか
ら噴霧して燃焼することができるので、石炭粒子は爆発
的に極く細かく割れて超微粒子級の粒径となって爆燃す
るようになる。よって、機械的外力を用いて超微粉砕す
ることなく同等の燃焼効果を得ることができるので、燃
焼の省エネルギ化を図ることができる。According to the coal burning method of the present invention, the brittle pulverized coal can be sprayed and burned from the burner without being pulverized, so that the coal particles are explosively extremely fine. It breaks and becomes deflagrated to ultrafine particle size. Therefore, the same combustion effect can be obtained without ultra-fine pulverization using a mechanical external force, and energy saving in combustion can be achieved.
【図１】本発明の石炭脆化方法により微粉炭を脆化した
様子を示すＳＥＭ写真であり、（Ａ）は脆化前、（Ｂ）
は脆化後を示す。FIG. 1 is an SEM photograph showing pulverized coal embrittled by the coal embrittlement method of the present invention, wherein (A) is before embrittlement and (B).
Indicates after embrittlement.
【図２】石炭の断面を示す光学顕微鏡写真である。FIG. 2 is an optical micrograph showing a cross section of coal.
【図３】石炭の断面のおける細孔の分布を示す模式図で
ある。FIG. 3 is a schematic diagram showing a distribution of pores in a cross section of coal.
【図４】石炭の断面を示すＳＥＭ写真である。FIG. 4 is an SEM photograph showing a cross section of coal.
【図５】ＥＰＭＡ分析を行う石炭断面のＳＥＭ写真であ
る。FIG. 5 is a SEM photograph of a cross section of a coal subjected to EPMA analysis.
【図６】石炭の断面のケイ素の分布を示すＥＰＭＡ分析
チャートである。FIG. 6 is an EPMA analysis chart showing the distribution of silicon in the cross section of coal.
【図７】石炭の断面のアルミニウムの分布を示すＥＰＭ
Ａ分析チャートである。FIG. 7 shows an EPM showing the distribution of aluminum in a cross section of coal.
It is an A analysis chart.
【図８】石炭の断面の鉄の分布を示すＥＰＭＡ分析チャ
ートである。FIG. 8 is an EPMA analysis chart showing the distribution of iron in a cross section of coal.
【図９】石炭脆化装置の一例を示す斜視図であり、
（Ａ）は加圧時、（Ｂ）は減圧時をそれぞれ示す。FIG. 9 is a perspective view showing an example of a coal embrittlement device,
(A) shows the time of pressurization, and (B) shows the time of depressurization.
【図１０】微粉炭の粒径分布を示す図である。FIG. 10 is a diagram showing a particle size distribution of pulverized coal.
【符号の説明】 １ 石炭脆化装置 ２ 容器 ３ 蓋体 ４ 給気手段 ８ 高圧ガス ９ 石炭[Description of Signs] 1 Coal embrittlement device 2 Container 3 Lid 4 Supply means 8 High-pressure gas 9 Coal
Claims (4)
しくはこれらの双方の変化による衝撃を与えることによ
り、前記石炭の細孔あるいは鉱物質と石炭質の界面から
クラックを生じさせることを特徴とする石炭脆化方法。The present invention is characterized in that cracks are generated from the pores of the coal or the interface between the mineral matter and the coal by subjecting the coal to a sudden pressure change or a temperature change or an impact of both of them. Coal embrittlement method.
気中に晒した後に急激に減圧することにより与えられる
ことを特徴とする請求項１記載の石炭脆化方法。2. The coal embrittlement method according to claim 1, wherein the pressure change is provided by exposing the coal to a high-pressure atmosphere and then rapidly reducing the pressure.
粉砕方法において、前記石炭は前記請求項１または２記
載の前記石炭脆化方法により脆化されてから粉砕される
ことを特徴とする石炭粉砕方法。3. A coal pulverization method for pulverizing coal by applying a mechanical external force thereto, wherein the coal is pulverized after being embrittled by the coal embrittlement method according to claim 1 or 2. Coal grinding method.
法により脆化した微粉炭を微粉炭バーナにより燃焼する
ことを特徴とする石炭燃焼方法。4. A coal burning method characterized by burning pulverized coal embrittled by the coal embrittlement method according to claim 1 or 2 with a pulverized coal burner.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000260953A JP2002066372A (en) | 2000-08-30 | 2000-08-30 | Coal embrittlement method, coal pulverization method and coal combustion method using the same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000260953A JP2002066372A (en) | 2000-08-30 | 2000-08-30 | Coal embrittlement method, coal pulverization method and coal combustion method using the same |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2002066372A true JP2002066372A (en) | 2002-03-05 |
Family
ID=18748885
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2000260953A Pending JP2002066372A (en) | 2000-08-30 | 2000-08-30 | Coal embrittlement method, coal pulverization method and coal combustion method using the same |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2002066372A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105092790A (en) * | 2015-08-11 | 2015-11-25 | 河南理工大学 | Coal reservoir fracturing physical simulation device and simulation method based on solvent extraction |
| CN112191350A (en) * | 2020-12-09 | 2021-01-08 | 湘潭大学 | Sepiolite ore temperature and pressure transient crushing method |
-
2000
- 2000-08-30 JP JP2000260953A patent/JP2002066372A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105092790A (en) * | 2015-08-11 | 2015-11-25 | 河南理工大学 | Coal reservoir fracturing physical simulation device and simulation method based on solvent extraction |
| CN112191350A (en) * | 2020-12-09 | 2021-01-08 | 湘潭大学 | Sepiolite ore temperature and pressure transient crushing method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CA2606023C (en) | Method to transform bulk material | |
| US10598573B2 (en) | Method for producing a carbonate bonded, press-moulded article | |
| US4666591A (en) | Slag disposal method | |
| JP2002066372A (en) | Coal embrittlement method, coal pulverization method and coal combustion method using the same | |
| CN110386597A (en) | Large-scale production thin graphene equipment and large-scale production thin graphene method | |
| JPH0613098B2 (en) | Mineral crushing method | |
| CN100528509C (en) | Breaking device, foaming gas recovery apparatus, and froming gas separating and recovery system | |
| JP3980747B2 (en) | Method for producing petroleum residue-water slurry | |
| WO2020155429A1 (en) | High-performance crusher for sample preparation | |
| Puttick et al. | The mechanical breakdown of sodium chloride crystals | |
| JP3870203B2 (en) | Nanocarbon production method and apparatus | |
| US6766970B2 (en) | Method and apparatus for a crusher | |
| JP2003238969A (en) | Technology for hydrolysis of impact-loaded bamboo, timber and other plant biomass using subcritical fluid or supercritical fluid | |
| Ono | Improved Coal Pulverization Method Using the Embrittlement due to Cracks Generated in Pores of Coal [Translated] | |
| JP3985298B2 (en) | Method for producing solvent degreasing residual water slurry | |
| Borkowski et al. | Technical aspects of coal disintegration using high pressure water jet | |
| Mal’KOV et al. | Structure and properties of detonation soot particles | |
| AU2017292516A1 (en) | Coal processing system and processing method | |
| CN108479701B (en) | A kind of superhydrophobic superoleophilic carbon material and preparation method thereof | |
| JP4936358B2 (en) | Deashing method for high ash coal | |
| RU2277015C2 (en) | Method of grinding porous materials | |
| JP2004243293A (en) | Ultra-fine pulverization, classification and crystallization equipment using pressure and temperature differences due to forced destruction of hydrothermal film | |
| Galimov et al. | Technologies for producing heat-conducting carbon foams by method of pitches carbonization under pressure | |
| Padhi et al. | Utilizing Lignocellulosic Waste for Extraction and Characterization of Cellulose And Nanocellulose | |
| Zhu et al. | Preliminary research on grindability improvement of coal by microwave pretreatment |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A977 | Report on retrieval |
Free format text: JAPANESE INTERMEDIATE CODE: A971007 Effective date: 20050609 |
|
| A131 | Notification of reasons for refusal |
Free format text: JAPANESE INTERMEDIATE CODE: A131 Effective date: 20050615 |
|
| A521 | Written amendment |
Free format text: JAPANESE INTERMEDIATE CODE: A523 Effective date: 20050815 |
|
| A02 | Decision of refusal |
Free format text: JAPANESE INTERMEDIATE CODE: A02 Effective date: 20051207 |
|
| A521 | Written amendment |
Free format text: JAPANESE INTERMEDIATE CODE: A523 Effective date: 20060206 |
|
| A911 | Transfer of reconsideration by examiner before appeal (zenchi) |
Free format text: JAPANESE INTERMEDIATE CODE: A911 Effective date: 20060323 |
|
| A912 | Removal of reconsideration by examiner before appeal (zenchi) |
Free format text: JAPANESE INTERMEDIATE CODE: A912 Effective date: 20060414 |