CN1034227C - Production method of high-concentration coal-water slurry - Google Patents

Production method of high-concentration coal-water slurry Download PDF

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Publication number
CN1034227C
CN1034227C CN91108299A CN91108299A CN1034227C CN 1034227 C CN1034227 C CN 1034227C CN 91108299 A CN91108299 A CN 91108299A CN 91108299 A CN91108299 A CN 91108299A CN 1034227 C CN1034227 C CN 1034227C
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coal
water
concentration
ball mill
slurry
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CN91108299A
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CN1062754A (en
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都甲仁
藤村英夫
渡边宪久
大平正明
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Japan Com Co Ltd
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Japan Com Co Ltd
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Abstract

To produce a highly concentrated and stable coal/water slurry having a low viscosity with low power by decreasing voids between coal particles. Raw coal 1 is crushed on a crusher 3 into particles having an average particle diameter of 300-800mum, and water 6 and a dispersant 7 are added to the crushed material. The mixture is ground on a ball mill or rod mill 8 to obtain a highly concentrated coal/water slurry having an average particle diameter of 20-60mum. A part of the slurry is supplied to a columnar attritor 11 and ground into a highly concentrated coal/water slurry having an average particle diameter of 5-10mum. 90-60wt.% former slurry is mixed 13 with 10-40wt.% latter slurry under a shearing force, thereby decreasing the voids. Also, 10-50wt.% slurry of the ball mill or rod mill 8 is preferably circulated 10.

Description

Production method of high-concentration coal-water slurry
The present invention relates to the preparation method of high-concentration coal-water slurry.
For transportability, the storage property of improving coal and be easy to processing, the method that adopts is coal grinding is become fine powder and to be scattered in the water with the form of slurries usually.This coal-water syrup liquid is, a kind of directly burnt fuel still, considers from efficiency of combustion that this coal-water syrup liquid should have high density, and from being easy to transportation and processing considers that this coal-water syrup liquid should have low viscosity again.In order to solve this conflicting demand of high density and low viscosity, various methods have been attempted up to now.
Wet type preparation method as high-concentration coal-water slurry, known have a kind of high density Ginding process, in the method, by the broken coal of ball mill with relatively large amount, water and dispersion agent grind together, then with thick particle removal, known also have a kind of lower concentration Ginding process, in the method, by ball milling more a spot of relatively broken coal and water are ground together, with the concentration that obtains a kind of wherein coal lower concentration coal-water syrup liquid less than 60% (weight), again with this slurry dried to form the exsiccant cake, at last the exsiccant cake is scattered in the water to obtain the coal-water syrup liquid of high density.
Past mainly is to use the lower concentration Ginding process, because it removes thick particle by classification easily.For example, coal and water are added in the first step ball mill to produce the coal-water syrup liquid of lower concentration, this slurries dilute with water and sieve to remove thick particle, be dried with moisture eliminator and obtain dried cake, this dried cake is joined in the ball mill of the second stage to obtain high-concentration coal-water slurry (Japanese Patent Application Publication 63-15893/1988) together with water and dispersion agent, perhaps broken coal and water are handled to obtain the lower concentration slurries by tuber grinder, these slurries are divided into two parts, a classified and remove big particle, then be dried to obtain fine grain dried cake, another part handled by the wet type super grinder, mixes with above-mentioned dried cake then and obtains high-concentration coal-water slurry (Japanese Patent Application Publication 63-51493/1988).
Yet these methods all have shortcoming, be difficult to obtain the product of all being satisfied with aspect high density and the low viscosity two exactly, and they comprise complicated operations and need use moisture eliminator.In order to overcome the shortcoming of present technology, main purpose of the present invention provides a kind of method that is used to prepare the high-level efficiency less energy-consumption of stable, high density, low viscosity coal-water syrup liquid.
Be conceived to such fact, be that high density and low viscosity coal-water syrup liquid depend on the intergranular hole ratio of duff in the slurries, it is porosity, and lower porosity can provide higher concentration and more low viscous coal-water syrup liquid, and the inventor has studied the relation between fine grain size distribution of coal and the porosity.
The result, found the method that reduces porosity, promptly the coarse particles coal-water syrup liquid that will contain particle diameter under the condition that has shearing force to exist mixes with the fine particulate coal-aqueous slurry that contains small particle size, in the case, porosity changes with coarse grained particle diameter, fine grain particle diameter and ratio of mixture, and contain this fine grain high-concentration coal-water slurry and can make with tower shredder, become the present invention thus.
According to the present invention, a kind of preparation method of high-concentration coal-water slurry is provided, this method comprises that it is 300~800 μ that crusher is crushed to median size with raw coal, adding water and dispersion agent in this broken coal and grinding this mixture with ball mill or rod mill is the high-concentration coal-water liquid of 60~80% (weight) with median size 20~60 μ that obtain coal and the concentration of coal, and the part of the high-concentration coal-water slurry that will obtain thus to grind with the median size that obtains a kind of coal with tower shredder be that the concentration of 5~10 μ and coal is the high-concentration coal-water slurry of 60~80 (weight), and under shearing force, the slurries with ball mill or the broken mistake of rod mill of the slurries and 90~60% (weight) of the grinding of 10~40% (amounts) are mixed, reduce porosity whereby.
Schema below with reference to the expression embodiment of the invention is at length explained the present invention.In Fig. 1,1 expression raw coal, 2 expression raw coal loading hoppers, 3 expression crushers, 4 expression broken coal loading hoppers, 5 expression constant speed stokers, the water that 6 expressions add, a kind of additive of 7 expressions, 8 expression ball mill or rod mills, 9 expression receiving tanks, 10 expression recirculation slurries, the tower shredder of 11 expressions, 12 expression receiving tanks, 13 expression mixing tanks, and 14 expression products.F represents under meter, and P represents pump.
At first raw coal 1 is added in the crusher 3, this crusher for example is a kind of hammer mill or impact crusher, and it is 300~800 μ that raw coal is crushed to median size.This broken coal is added ball mill or the rod mill 8 with the water and the dispersion agent 7 (for example anion surfactant) that need to add by constant speed stoker 5 from broken coal loading hopper 4.In ball mill or rod mill 8, coal particle is milled to the particle diameter of 20~60 μ, with the high-concentration coal-water slurry that to obtain a kind of coal concentration be 60~80% (weight).
The slurries of discharging from ball mill or rod mill 8 are stored in the receiving tank 9, are 10 that part of returning in ball mill or the rod mill 8 to carry out recirculation with numeral.The quantity of recirculation is preferably 10~50% (weight) of the slurries of discharging from ball mill or rod mill 8.By this recirculation, because the slurries of discharging from ball mill or rod mill contain fine particle, these fine particles are mixed together with coarse particles in ball mill or rod mill 8, so just reduced particulate porosity in ball mill or rod mill 8, the result has just reduced viscosity, improve flowability, and therefore improved the running of ball mill.This has caused grinding smoothly and having reduced energy consumption.
The part of the high-concentration coal-water slurry in the receiving tank 9 is delivered in the mixing tank 13.Another part of high-concentration coal-water slurry in the receiving tank 9 is delivered in the tower shredder 11.For example, a kind of of this tower shredder is to sell with the trade(brand)name of TOWERMILL.This tower shredder heart position therein is equipped with water screw at a slow speed, and ball and raw material are packed in this tower shredder together.When raw material is ground when moving by the water screw rotation.By tower shredder 11 coal particle being ground to median size is 5~10 μ.This tower shredder can be effectively and is used for the grinding of high-concentration coal-water slurry primely.
The slurries and 90~60% (weight) that the tower shredder 11 of the process of 10~40% (weight) is handled are only delivered in the mixing tank 13 through the slurries of ball mill or rod mill processing and are mixed therein.In this mixing, need to use the sort of mixing tank that can produce high shear force, so that the median size that contains in the slurries of being handled by tower shredder 11 is the median size that contains in coal particle and those slurries of being handled by ball mill or rod mill of 5~10 μ is that the coal particle of 20~60 μ mixes equably, to reduce porosity.Preferably in series arrange two or more mixing tanks.The slurries of being discharged by mixing tank have the porosity that has reduced, thereby have significantly reduced viscosity.The slurries classification that this viscosity can have been reduced if desired is to obtain product 14.Like this, can obtain required high density and low viscous coal-water syrup liquid without moisture eliminator.
In the present invention, in the slurries of handling by ball mill or rod mill, the median size of coal particle is 20~60 μ, and in the slurries of further handling through tower shredder, the median size of coal particle is 5~10 μ.Under the condition that shearing force exists, mix these two kinds of slurries (i.e. the latter of the former and 10~40% (weight) of 90~60% (weight)) in predetermined ratio, can make the porosity reduction and its viscosity is significantly reduced.Come a situation is described in further detail with reference to embodiment below.
Fig. 2 has shown coal-water syrup liquid mixture (coal concentration: ratio of mixture 68.5%) and the relation between the porosity, and the relation between this ratio of mixture and the viscosity, said mixture comprises what a kind of process ball mill or rod mill were handled, its median size is that coal-water syrup liquid and the tower shredder of another kind of further process of 51 μ grinds, and median size is the coal-water syrup liquid of 5.2 μ.Just as shown in the drawing, when the slurries that ground by tower shredder being joined only in the slurries that ball mill or rod mill were handled, porosity reduces along with the increase of said add-on, and viscosity also decreases.But after said add-on surpassed about 20%, porosity then increased and viscosity sharply increases.Therefore, when using these two kinds of slurries, 20% slurries and 80% slurries through ball mill or rod mill processing of handling through tower shredder are mixed the coal-water syrup liquid that can obtain high density with different median sizes.The slurries of gained have the low viscosity that is lower than 800CP (even also be like this up to the situation of 68.5% (weight) under in coal concentration) and satisfactory stability.
Fig. 3 has shown the ratio of mixture of coal-water syrup liquid mixture (concentration of coal is 67.1%) and the relation between the relation between the porosity and this ratio of mixture and the viscosity, said mixture comprises what a kind of process ball mill or rod mill were handled, its median size is that coal-water syrup liquid and the tower shredder of another kind of further process of 40 μ grinds, and its median size is the coal-water syrup liquid of 8.4 μ.In this case, slurries and 25% (weight) of handling with 75% (weight) process ball mill or rod milling further mix through the slurries that tower shredder is handled, and can obtain the porosity and the minimal viscosity that is about 500CP of minimum.
As mentioned above, the slurries of only handling through ball mill or rod mill will depend on their median sizes separately with the blending ratio of the slurries of further handling through tower shredder.Therefore, need only median size and the ratio of mixture suitably adjusted separately, can easily obtain high density, low viscosity and stable coal-water syrup liquid.
With crusher (as impact crusher etc.) with coal when broken, along with the reduction of particle diameter, required energy is corresponding to be increased, still, the situation for only median size being reduced to 300 μ does not then need very high energy.Yet, be 300 μ or littler if be crushed to median size, need very high energy.For coal being crushed to median size is 300 μ or littler, uses ball mill or rod mill just to have the advantage of relatively low energy consumption.In addition, in the shattering process of ball mill or rod mill, be 20 μ or littler in order to be crushed to median size, then can cause required energy to increase rapidly.Be about 20 μ or littler for coal being crushed to median size, use tower shredder just to have the advantage of relatively low energy consumption.In the present invention, using crusher (as impact crusher etc.) that coal is crushed to median size is 300~800 μ, with ball mill or grinding machine coal being crushed to median size is 20~60 μ, is 5~10 μ with tower shredder with coal grinding to median size, and the purpose of Kao Lving is the required energy consumption of grinding that is used for coal in order to reduce like this.
In the present invention, under the condition that has shearing force to exist, by satisfactory ratio of mixture broken under high density with ball mill or rod mill, the slurries that contain median size and be the coal of 20~60 μ are that the slurries of the coal particle of 5~10 μ mix with the median size that contains of grinding under high density with the tower shredder of ball, obtain a kind of minimum porosity that has thus, high density, low viscosity and stable coal-water syrup liquid.In addition, owing to carry out fragmentation and grinding under high density, so the present invention can save the drying process to slurries, and reduced energy consumption and simplified operation.Have, the present invention combines use to crusher and shredder according to the diameter of coal particle again, has further reduced energy consumption whereby.

Claims (2)

1. the preparation method of a high-concentration coal-water slurry, its step comprises:
(a) with crusher the raw coal fragmentation is reached the median size of 300-800 μ,
(b) water and dispersion agent are added in the broken coal and mixture is ground and obtain high depth coal-water syrup liquid with ball mill or rod mill, wherein the coal median size is 20-60 μ, and coal concentration is 60-80% (weight).
(c) with gained high-concentration coal-water slurry part (A) in the step (b) and part (B),
(d) will part (A) send in the tower shredder and produce high-concentration coal-water slurry (C), wherein the coal median size be 5-10 μ, and coal concentration be 60-80% (weight) and
(e) under the condition that has shearing force to exist, the part (B) of 90-60% (weight) mixed with the high-concentration coal-water slurry (C) of 10-40% (weight) and reduce porosity.
2. according to the process of claim 1 wherein that the described slurries by discharging in ball mill or the rod mill of 10-50% (weight) return in ball mill or the rod mill to carry out recirculation again.
CN91108299A 1990-12-21 1991-11-28 Production method of high-concentration coal-water slurry Expired - Fee Related CN1034227C (en)

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Application Number Priority Date Filing Date Title
JP41802890A JPH04220494A (en) 1990-12-21 1990-12-21 Manufacture of highly concentrated coal/water slurry
JP418028/90 1990-12-21

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CN1034227C true CN1034227C (en) 1997-03-12

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Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04372691A (en) * 1991-06-20 1992-12-25 Nippon Komu Kk Production of highly concentrated aqueous slurry of coal
JPH0578676A (en) * 1991-09-24 1993-03-30 Nippon Komu Kk Production of high-concentration coal-water slurry from coal dressing slurry
JPH0711268A (en) * 1991-12-27 1995-01-13 Nippon Com Kk Production of deashed high-concentration coal-water slurry
CN101691927B (en) * 2009-09-23 2011-04-20 郑州洪威高新能源工程技术有限公司 Water coal slurry device and production process thereof
CN101985571A (en) * 2010-10-26 2011-03-16 江阴市东发机械制造有限公司 Method for preparing water coal slurry
CN104927947A (en) * 2014-03-19 2015-09-23 通用电气公司 Method, apparatus, and corresponding system for processing coal water slurry
CN104194849A (en) * 2014-09-24 2014-12-10 沈阳市三鼎节能技术有限公司 Preparation technology of coal water slurry and coal water slurry
CN106147897B (en) * 2016-06-27 2018-03-09 中煤科工清洁能源股份有限公司 A kind of low-order coal water-coal-slurry and preparation method thereof
CN106244266B (en) * 2016-09-23 2018-04-06 中煤科工清洁能源股份有限公司 The method of water-coal-slurry and the water-coal-slurry of preparation are prepared with technology using form class is divided
CN113560012A (en) * 2021-06-29 2021-10-29 江苏恒丰能环科技股份有限公司 Method for changing pulp particle size distribution of rod mill
CN114453115A (en) * 2021-12-14 2022-05-10 佛山市恒力泰机械有限公司 Pulping method of ceramic material

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CN85100543A (en) * 1985-04-03 1985-12-20 中国科学院感光化学研究所 High concentration water coal slurry
CN85109744A (en) * 1984-11-20 1986-11-05 电源开发株式会社 Remove the preparation of the high solid concentration water coal slime of ash content
CN86103216A (en) * 1985-05-10 1986-12-17 巴布科克和威尔科斯公司 The production of coal-water fuel

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JPS5883095A (en) * 1981-07-10 1983-05-18 Hitachi Ltd Preparation of coal slurry
NZ202639A (en) * 1982-03-22 1986-03-14 Atlantic Res Corp Stable coal-water slurries and a method for their preparation
JPH04372691A (en) * 1991-06-20 1992-12-25 Nippon Komu Kk Production of highly concentrated aqueous slurry of coal

Patent Citations (3)

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Publication number Priority date Publication date Assignee Title
CN85109744A (en) * 1984-11-20 1986-11-05 电源开发株式会社 Remove the preparation of the high solid concentration water coal slime of ash content
CN85100543A (en) * 1985-04-03 1985-12-20 中国科学院感光化学研究所 High concentration water coal slurry
CN86103216A (en) * 1985-05-10 1986-12-17 巴布科克和威尔科斯公司 The production of coal-water fuel

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CN1062754A (en) 1992-07-15
AU8787991A (en) 1992-06-25
AU648123B2 (en) 1994-04-14
JPH04220494A (en) 1992-08-11

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