EP0124488B1 - Verfahren zur Herstellung von stabilen Kohle-Wasser-Gemischen - Google Patents

Verfahren zur Herstellung von stabilen Kohle-Wasser-Gemischen Download PDF

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Publication number
EP0124488B1
EP0124488B1 EP84830057A EP84830057A EP0124488B1 EP 0124488 B1 EP0124488 B1 EP 0124488B1 EP 84830057 A EP84830057 A EP 84830057A EP 84830057 A EP84830057 A EP 84830057A EP 0124488 B1 EP0124488 B1 EP 0124488B1
Authority
EP
European Patent Office
Prior art keywords
coal
water
grinding
preparation
water mixtures
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
EP84830057A
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English (en)
French (fr)
Other versions
EP0124488A1 (de
Inventor
Luigi Palumbo
Giansilvio Malgarini
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.)
Rina Consulting Centro Sviluppo Materiali SpA
Original Assignee
Centro Sviluppo Materiali SpA
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 Centro Sviluppo Materiali SpA filed Critical Centro Sviluppo Materiali SpA
Priority to AT84830057T priority Critical patent/ATE49016T1/de
Publication of EP0124488A1 publication Critical patent/EP0124488A1/de
Application granted granted Critical
Publication of EP0124488B1 publication Critical patent/EP0124488B1/de
Expired legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G OR C10K; LIQUIFIED PETROLEUM GAS; USE OF ADDITIVES TO FUELS OR FIRES; FIRE-LIGHTERS
    • C10L1/00—Liquid carbonaceous fuels
    • C10L1/32—Liquid carbonaceous fuels consisting of coal-oil suspensions or aqueous emulsions or oil emulsions
    • C10L1/326—Coal-water suspensions

Definitions

  • the present invention relates to a process for the preparation of stable coal-water mixtures. More precisely it relates to the production of coal-water mixtures with a high coal content, suitable for use as a substitute for fuel oil or metallurgical coke (e.g. in blast furnaces).
  • coal is coming to play an ever more important role for use as auxiliary fuel injected into the blast furnace via the tuyeres.
  • WO-A-83/00501 discloses a multistep process utilizing a first wet grinding and second final grinding in presence also of a suitable fluidising agent.
  • Prescription of particle size obtainable is restricted to the teaching that a given percentage of solids must be finer than a specified particle size.
  • Disclosed viscosities are in a range (1000 to 4000 cPs at 60 rpms, corresponding to 1300-5000 cPs at 30 rpms) which causes the slurries to be pumpable and sprayable with great difficulties.
  • EP-A-117742 which utilizes ground coal to prepare the slurry with water and dispersant, and obtains a too high viscosity (more than 1400 cPs).
  • WO-A-84/03297 discloses a process in which a non-specific multistep grinding (wet, or dry or any other way) is used to obtain a particular bimodal particle size distribution involving two different mean diameters. Also in this case the viscosity obtained is too high for the slurry to be easily pumped.
  • This invention proposes to eliminate these difficulties by providing a simple, cheap process for preparing coal-water mixture with a coal content of 70 to 80% which is easy to pump and is stable timewise.
  • coal is fed into a mill together with the quantity of water desired in the final mixture. Typically 70-80% (by weight) of coal is added to 20-30% of water. At this stage between 0,05 and 2% (by weight) of known fluidizing agents, such as humic acid based compounds or their derivatives or lignin sulphonates are added. Preferably, coal is finer than 3 mm in size.
  • the first stage of grinding must provide a mixture in which the harmonic mean diameter of the coal particles is around 60 pm, at least 50% of the coal being finer than 74 um, and less than 20% coarser than 250 ⁇ m.
  • the type of mill is not binding according to the invention.
  • the minus 3 mm coal was wet ground in a disc mill, as described above, feeding to the first mill the coal, water and additive in the quantities desired for the final suspension.
  • the static stability of the mixtures over the course of time is indicated by the variation in the number of seconds required for a 20 g rod 3 mm in diameter to penetrate under its own weight through a 180 mm depth of mixture stored in the undisturbed state.
  • the coal had all settled out after one week, so penetration of the rod was stopped by the coal layer.
  • the assessment was made as objectively as possible, being based on the ratio of the penetration time after five weeks compared with that when the mixture had just been made up (zero weeks). With a ratio of less than 4 the stability of the mixture was considered very good, while if it was between 4 and 10 it was classed as good.
  • the mixtures thus prepared are suitable for substituting fuel oil and similar petroluem derivatives in applications such as, for instance, fuel in thermal-electric power stations or as auxiliary fuel for injection into blast furnaces via the tuyeres.
  • the mixtures appear to be very interesting for the latter application, not only from the economic point of view but also because they permit particularly uniform efficient blast-furnace operation.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Liquid Carbonaceous Fuels (AREA)
  • Manufacture Of Iron (AREA)
  • Solid Fuels And Fuel-Associated Substances (AREA)

Claims (2)

1. Verfahren zur Herstellung eines stabilen und pumpbaren Kohle/Wassergemisches, das 70 bis 80% Kohle (Gew.), bekannte Fluidisierungsmittel in einem Anteil zwischen 0,05 und 2 Gew.-%, sowie dem Rest, bis auf 100%, Wasser enthält, gekennzeichnet durch die Kombination der folgenden beiden Schritte:
Vermahlen der gesamten Kohle zusammen mit dem Wasser und dem Fluidisierungsmittel in den gleichen für das Endgemisch erforderlichen Anteilen;
Durchführung diese Vermahlens bis zu einem Punkt, wo der harmonische mittlere Durchmesser der Kohlepartikel um 50 µm beträgt und wenigstens 60% der Kohle feiner als 74 pm sind, während weniger als 10% grober als 250 µm sind.
2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß wenigstens 70% der Kohle nach dem Vermahlen eine Partikelgröße von weniger als 74 µm aufweisen.
EP84830057A 1983-04-29 1984-03-06 Verfahren zur Herstellung von stabilen Kohle-Wasser-Gemischen Expired EP0124488B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT84830057T ATE49016T1 (de) 1983-04-29 1984-03-06 Verfahren zur herstellung von stabilen kohlewasser-gemischen.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT4818583 1983-04-29
IT48185/83A IT1197637B (it) 1983-04-29 1983-04-29 Procedimento per la preparazione di miscele stabili carbone-acqua

Publications (2)

Publication Number Publication Date
EP0124488A1 EP0124488A1 (de) 1984-11-07
EP0124488B1 true EP0124488B1 (de) 1989-12-27

Family

ID=11265084

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84830057A Expired EP0124488B1 (de) 1983-04-29 1984-03-06 Verfahren zur Herstellung von stabilen Kohle-Wasser-Gemischen

Country Status (10)

Country Link
EP (1) EP0124488B1 (de)
AR (1) AR230842A1 (de)
AT (1) ATE49016T1 (de)
AU (1) AU568637B2 (de)
BR (1) BR8401913A (de)
CA (1) CA1274686A (de)
DE (1) DE3480850D1 (de)
IN (1) IN162513B (de)
IT (1) IT1197637B (de)
ZA (1) ZA842004B (de)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5380563A (en) * 1991-06-20 1995-01-10 Coal Industry (Patents) Limited Ceramic welding
US5686028A (en) * 1991-07-03 1997-11-11 Glaverbel Process for forming a coherent refractory mass on a surface
JP2595465B2 (ja) * 1994-04-13 1997-04-02 英司 池田 水・石炭混合燃料
AUPN451795A0 (en) * 1995-08-01 1995-08-24 Isentropic Systems Ltd Improvements in the use of carbonaceous fuels
AU714670B2 (en) * 1995-08-01 2000-01-06 Dut Pty Ltd Improvements in the use of carbonaceous fuels

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1983000501A1 (en) * 1981-07-31 1983-02-17 Univ Alfred Res Coal-water slurry
WO1984003297A1 (en) * 1983-02-22 1984-08-30 Univ Alfred Res Novel grinding mixture and process for preparing a slurry therefrom
EP0117742A2 (de) * 1983-02-25 1984-09-05 Dai-Ichi Kogyo Seiyaku Co., Ltd. Herstellung einer wässrigen Kohlensuspension mit hohem Kohlegehalt

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE398155C (de) * 1913-08-01 1924-07-02 Hermann Plauson Verfahren zur Erzeugung eines fluessigen Heizstoffes durch Vermahlen von Kohle oder kohlehaltigen Stoffen im Gemisch mit einer Fluessigkeit
JPS5620090A (en) * 1979-07-26 1981-02-25 Kao Corp Dispersant for slurry of coal powder in water
JPS5896690A (ja) * 1981-12-03 1983-06-08 Electric Power Dev Co Ltd 石炭の高濃度スラリ−の製造方法
JPS58117283A (ja) * 1981-12-29 1983-07-12 Electric Power Dev Co Ltd 石炭スラリ−組成物
US4498906A (en) * 1982-03-22 1985-02-12 Atlantic Research Corporation Coal-water fuel slurries and process for making

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1983000501A1 (en) * 1981-07-31 1983-02-17 Univ Alfred Res Coal-water slurry
WO1984003297A1 (en) * 1983-02-22 1984-08-30 Univ Alfred Res Novel grinding mixture and process for preparing a slurry therefrom
EP0117742A2 (de) * 1983-02-25 1984-09-05 Dai-Ichi Kogyo Seiyaku Co., Ltd. Herstellung einer wässrigen Kohlensuspension mit hohem Kohlegehalt

Also Published As

Publication number Publication date
IN162513B (de) 1988-06-04
AU568637B2 (en) 1988-01-07
EP0124488A1 (de) 1984-11-07
AR230842A1 (es) 1984-07-31
ATE49016T1 (de) 1990-01-15
IT1197637B (it) 1988-12-06
AU2611284A (en) 1984-11-01
DE3480850D1 (de) 1990-02-01
CA1274686A (en) 1990-10-02
ZA842004B (en) 1984-12-24
IT8348185A0 (it) 1983-04-29
BR8401913A (pt) 1984-12-04

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