EP0223573B1 - Method of preparing fine-particle high-loaded coal-water slurry - Google Patents

Method of preparing fine-particle high-loaded coal-water slurry Download PDF

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Publication number
EP0223573B1
EP0223573B1 EP19860308894 EP86308894A EP0223573B1 EP 0223573 B1 EP0223573 B1 EP 0223573B1 EP 19860308894 EP19860308894 EP 19860308894 EP 86308894 A EP86308894 A EP 86308894A EP 0223573 B1 EP0223573 B1 EP 0223573B1
Authority
EP
European Patent Office
Prior art keywords
slurry
coal
mill
classifier
water
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.)
Expired
Application number
EP19860308894
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0223573A2 (en
EP0223573A3 (en
Inventor
Noboru Sato
Tatsuo Hagiwara
Harumi Fujimoto
Hironori Ozaki
Tadashi Katahata
Toshiaki Kanamori
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.)
Kawasaki Motors Ltd
Original Assignee
Kawasaki Jukogyo KK
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 Kawasaki Jukogyo KK filed Critical Kawasaki Jukogyo KK
Publication of EP0223573A2 publication Critical patent/EP0223573A2/en
Publication of EP0223573A3 publication Critical patent/EP0223573A3/en
Application granted granted Critical
Publication of EP0223573B1 publication Critical patent/EP0223573B1/en
Expired legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23K—FEEDING FUEL TO COMBUSTION APPARATUS
    • F23K1/00—Preparation of lump or pulverulent fuel in readiness for delivery to combustion apparatus
    • F23K1/02—Mixing solid fuel with a liquid, e.g. preparing slurries

Definitions

  • Fig. 3 shows a conventional method of preparing fine-particle high-loaded coal-water slurry and conventional equipment for preparing the same.
  • coal 1 which has been crushed previously, is supplied by a weighing feeder to a mill 3, for example a ball mill, together with water 4 and dispersion agent 5.
  • the coal 1 is then ground and mixed into slurry within the mill 3 and flows out as fine-particle high loaded coal-water slurry 7, which is then transferred by means of a pump 6.
  • the mill 3 has a length which is large compared to its diameter, the ratio of the length to the diameter being usually 4 to 8.
  • the ratio of the length to the diameter of a mill employed in an ordinary method of preparing high-loaded coal-water slurry and ordinary equipment for preparing the same is 2 to 3.
  • Increasing the ratio of length to diameter of the same makes it possible to increase the residence time of the coal-water mixture in the mill, thus promoting the grinding operation performed by the grinding medium, and thereby producing fine-particle high loaded coal-water slurry with
  • Slurry 13 from the coal cleaner 11 is introduced into a dehydrating device 14 which removes water 15 therefrom, and the resulting slurry is made into cake having a coal content of not less than 60% by weight. Subsequently, the cake is made into a fluid in a device 16. In this way, fine-particle high-loaded coal-water slurry 7 is produced and is transferred by means of the pump 6.
  • the underflow slurry should then be subjected to further tests in the particle size analyzer to determine what the particle size distribution of the underflow slurry is and its attendant surface area and porosity.
  • the underflow slurry is passed through a third line to a final trim tank. If, however, the solids content or the viscosity or the specific surface area or the porosity of the underflow slurry is not as desired, then a portion of the underflow slurry is passed through the second line to a second mill. Depending on how badly the underflow slurry is out of specification, from 1 to 30 volume percent of the underflow slurry is passed to the second mill and the remainder is passed to the final trim tank.
  • Water is fed into the second mill so that the solids concentration of the ground slurry fed through the second line is adjusted to 30 to 60 volume percent.
  • the diluted slurry in the second mill is then ground in the second mill until at least 95 volume percent of the particles in the slurry have diameters less than 20 microns and preferably, less than 15 microns.
  • the classifier may be a vibrating screen classifier, a cylinder-shaped classifier, or a horizontal disc-shaped classifier.
  • Fig. 1 shows the embodiment of the present invention.
  • a first stage mill 3a is supplied with coal 1, water 4, and a dispersion agent 5 under the operation of a weighing feeder 2 in such a manner that slurry having a predetermined coal content can be obtained.
  • the coal 1 is ground within the first stage mill 3a and the mixture flows out as slurry 8.
  • the slurry 8 is then led to a classifier 9 wherein coarser particles 9b contained in the slurry 8 are removed from the mixture.
  • a lower flow 9a is directly supplied to a second stage mill 3b wherein it is successively ground, flows out from the second stage mill 3b as fine-particle high loaded coal-water slurry 7 containing minimal coarse particles, and then is transferred by means of a pump 6.
  • the coarser particles 9b may be sent back to the first stage mill 3a through suitable means and may be ground together with coal 1, water 4, and a dispersion agent 5.
  • the slurry 8, the lower flow 9a, and the fine-particle high loaded coal-water slurry 7 have practically the same coal content which is not less than 60% by weight.
  • the lower flow 9a containing lesser amount of coarse particles is supplied to the mill 3b where it is ground again. Therefore, since the coarse particles are substantially low in this stage of grinding, the coal particles can be adequately subjected to grinding action without any disturbance, thus promoting the grinding operation and thereby producing fine-particle high loaded coal-water slurry 7 which contains minimal coarse particles.
  • first stage mill 3a and the second stage mill 3b a ball mill which is so dimensioned that the ratio of length to diameter is 2 to 4 is used. Therefore, within the first stage and second stage mills 3a and 3b, grinding can so proceed in the state of high loaded coal-water slurry with adequately long residence time to prepare fine-particle high loaded coal-water slurry having a (specified) particle size distribution. This arrangement achieves a remarkably finer particle size distribution or arrangement in comparison to that of the case of a single mill having the length to diameter ratio of approximately 3.
  • Each of the curve groups collectively indicates the data values of a number of experiments.
  • ordinate value (cumulative oversize of 150 ⁇ m corresponding to a abscissa value 85% (cumulative undersize of 74 ⁇ m) is much lower in curve group a (the present invention) than in curve groups b and c (prior arts).
  • the present invention makes it possible to prepare fine-particle high loaded coal-water slurry containing minimal coarse particles, and also possible, when the slurry is supplied to combustion equipment to be burned therein, to reduce the amount of the unburnt carbon in the combustion residue, and to lower the NOx concentration in the exhaust gases.
  • the second stage mill is supplied with slurry from the first stage mill after coarser particles have been removed from the slurry by means of the classifier, and the slurry is then ground in the second stage mill, and also because the grinding is performed for an adequate period, fine-particle high loaded coal-water slurry containing minimal coarse particles can be prepared by relatively simple method and equipment without any complicated equipment or operation, and in addition, when the slurry is supplied to combustion equipment to be burnt therein, the amount of unburnt carbon in the combustion residue can be reduced and also the NOx concentration in the exhaust gases can be lowered.
  • the capability of the classifier can be increased, various advantages are attainable, such as the possibility of mass production of fine-particle high loaded coal-water slurry, and the possibility of excellent grinding efficiency (reduced power consumption) and grindability.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Liquid Carbonaceous Fuels (AREA)
  • Crushing And Grinding (AREA)
EP19860308894 1985-11-16 1986-11-14 Method of preparing fine-particle high-loaded coal-water slurry Expired EP0223573B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP256900/85 1985-11-16
JP25690085A JPS62116692A (ja) 1985-11-16 1985-11-16 微粒高濃度石炭水スラリ−の製造方法および装置

Publications (3)

Publication Number Publication Date
EP0223573A2 EP0223573A2 (en) 1987-05-27
EP0223573A3 EP0223573A3 (en) 1988-09-21
EP0223573B1 true EP0223573B1 (en) 1991-08-28

Family

ID=17298951

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19860308894 Expired EP0223573B1 (en) 1985-11-16 1986-11-14 Method of preparing fine-particle high-loaded coal-water slurry

Country Status (5)

Country Link
EP (1) EP0223573B1 (enExample)
JP (1) JPS62116692A (enExample)
AU (1) AU572410B2 (enExample)
CA (1) CA1279477C (enExample)
DE (1) DE3681123D1 (enExample)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10287522B2 (en) 2013-01-31 2019-05-14 General Electric Company System and method for preparing coal water slurry

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1021343C (zh) * 1986-12-26 1993-06-23 宇部兴产株式会社 固体燃料-水浆液组合物及其制备方法
DE3718568C1 (de) * 1987-06-03 1988-06-30 Steinmueller Gmbh L & C Verfahren zur Herstellung einer Kohle-Wasser-Mischung fuer die Verbrennung in einer Wirbelschichtfeuerung und Vorrichtung zur Durchfuehrung des Verfahrens
JP2001190974A (ja) * 2000-01-07 2001-07-17 Masumi Kusunoki 粉体分散機用解砕フィルタ装置

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4391702A (en) * 1977-10-07 1983-07-05 Nippon Steel Corporation Method for classification of coals for coke production
DE2919914A1 (de) * 1979-05-17 1980-11-20 Stotz Ag A Siebrost, insbesondere vibrationssiebrost
AU545527B2 (en) * 1981-12-03 1985-07-18 Electric Power Development Co. Ltd. Production of high concentration of coal
US4477260A (en) * 1982-05-05 1984-10-16 Alfred University Research Foundation, Inc. Process for preparing a carbonaceous slurry
US4477259A (en) * 1982-05-05 1984-10-16 Alfred University Research Foundation, Inc. Grinding mixture and process for preparing a slurry therefrom
GB2121819B (en) * 1982-06-14 1985-03-27 Smidth & Co As F L Method of manufacturing a pumpable coal/liquid mixture

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10287522B2 (en) 2013-01-31 2019-05-14 General Electric Company System and method for preparing coal water slurry

Also Published As

Publication number Publication date
EP0223573A2 (en) 1987-05-27
AU6510686A (en) 1987-05-21
DE3681123D1 (de) 1991-10-02
JPS62116692A (ja) 1987-05-28
AU572410B2 (en) 1988-05-05
EP0223573A3 (en) 1988-09-21
CA1279477C (en) 1991-01-29
JPH0329275B2 (enExample) 1991-04-23

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