EP0086129B1 - Wässrige Suspensionen die zumindest einen festen Brennstoff enthalten und Verfahren zu dessen Herstellung - Google Patents

Wässrige Suspensionen die zumindest einen festen Brennstoff enthalten und Verfahren zu dessen Herstellung Download PDF

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Publication number
EP0086129B1
EP0086129B1 EP83400145A EP83400145A EP0086129B1 EP 0086129 B1 EP0086129 B1 EP 0086129B1 EP 83400145 A EP83400145 A EP 83400145A EP 83400145 A EP83400145 A EP 83400145A EP 0086129 B1 EP0086129 B1 EP 0086129B1
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EP
European Patent Office
Prior art keywords
weight
solid combustible
aqueous suspensions
grinding
alkaline metal
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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
EP83400145A
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English (en)
French (fr)
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EP0086129A1 (de
Inventor
Jean-Louis Merry
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Charbonnages de France CDF
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Charbonnages de France CDF
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Publication of EP0086129A1 publication Critical patent/EP0086129A1/de
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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 aqueous suspensions of at least one solid fuel and a process for their preparation. These suspensions are remarkably stable and can be used in particular as fuel or for their gasification.
  • aqueous suspensions containing at least 60% by weight of at least one solid fuel which are stable on storage and can be pumped and dispersed in burners without particular difficulties.
  • Surfactants also called surfactants or detergents or surfactants, are, as is known, compounds capable of modifying the surface tension of the medium by giving it wettability properties. These are molecules with groups of marked hydrophilic and hydrophobic nature. They may be anionic surfactants (for example alkali metal alkylarylsulfonates), cationic (for example quaternary ammonium salts) or nonionic (for example polyether oxides).
  • anionic surfactants for example alkali metal alkylarylsulfonates
  • cationic for example quaternary ammonium salts
  • nonionic for example polyether oxides
  • the preferred surfactants for the present invention are alkali metal alkylarylsulfonates, for example sodium alkyl naphthalenesulfonates.
  • Dispersants also called deflocculants, are compounds capable of creating or amplifying the formation of electrical charges of the same sign on the surface of solid fuel particles. They therefore promote the creation of repulsion forces of an electrical nature between these particles.
  • the alkali metal silicates in particular the metasilicates
  • the alkali metal polyphosphates and the alkaline salts of organic polyacids (in particular the polyacrylates) are used.
  • Anionic surfactants and in particular alkali metal alkylarylsulfonates also have dispersing properties. However, they are insufficient to allow these products to be used alone in the suspensions which are the subject of the invention.
  • Gelling agents are compounds capable of forming colloidal solutions or suspensions of a thixotropic nature in water. They therefore give the suspensions of solid fuels in water a high viscosity at rest without affecting their pumpability and dispersibility properties in the burners.
  • Cellulose ethers are advantageously used, for example carboxymethylcellulose or methylcellulose.
  • the solid fuel is present in the aqueous suspensions according to the invention in the ground state so that 80% by weight of the grains have a dimension of less than 80 micrometers.
  • the aqueous suspensions present combustion difficulties, and that if more than 80% of the grains have a dimension less than 80 microns, the suspensions obtained are difficult to pump.
  • the grinding operation is such that 80% by weight of the solid fuel grains have a dimension of less than 80 micrometers.
  • the amount of water added during the implementation of the process is such that an aqueous suspension of solid fuel is obtained containing from 60 to 80% by weight of solid fuel.
  • aqueous suspensions according to the invention can also be obtained by dispersion of dry solid fuel in water.
  • wet grinding in the liquid phase is preferred because it does not present the risks of explosion inherent in dry grinding and does not require prior drying of the solid fuel.
  • agents facilitating the comminution of solid fuel Such additives get into the cracks of the solid fuel during grinding and prevent them from closing, thus acting as fracturing or embrittling agents.
  • tetraline pyridine, ethanolamine, acrylonitrile, orthocyclohexylphenol, sodium silicoaluminate.
  • An interesting raw material for the preparation of the suspensions according to the invention consists of the schlamms of coal washers which constitute an already divided product and which hardly currently has any other application than on-site combustion.
  • a particular mode of preparation of the suspensions according to the invention consists, beforehand, in subjecting the schlamms to a purification treatment, for example by flotation, in order to bring their content of non-combustible residue to a value of less than 10% and preferably of the order of 6 to 8% (expressed by weight relative to dry coal), then subjecting them to additional grinding in a liquid medium until their particle size is brought to a value such that 80% by weight of the grains have a dimension less than 80 micrometers, and to add, before or during grinding, water and the additives described above so as to produce a final product preferably containing from 60 to 80% by weight of carbon.
  • Coal washing schlamms obtained from Freyming charcoal (flaming fatty) are subjected to a flotation treatment in the presence of 400 grams per tonne of a mixture containing 25% methylisobutylcarbinol and 75% light fuel oil. Said flotation treatment is followed by filtration or centrifugation and sieving; a carbon is thus obtained at 15% water and 6% ash (expressed by weight relative to dry coal).
  • the suspension obtained has a viscosity at rest which gives it great stability on storage.
  • the rheogram of the product shows that it shears around 2 S - 1 and that the viscosity, after shearing for 2 minutes at 100 S - 1 , is 670 mPa.s (centipoises).
  • This product was burned in an experimental boiler with a power of 1 megawatt thermal equipped with a burner as described in FR-A-2 054 741 with an excess of air of 20%.
  • the thermal combustion efficiency is 80.3% against 89.2% for combustion of dry pulverized coal burning under the same conditions, a difference of only 8.9%.
  • the viscosities measured were, in the first case of 652 mPa.s (centipoise), in the second case of 670 mPa.s (centipoise), in the third case of 380 mPa.s (centipoise).

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  • 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)
  • Detergent Compositions (AREA)
  • Fireproofing Substances (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)
  • Solid Fuels And Fuel-Associated Substances (AREA)
  • Emulsifying, Dispersing, Foam-Producing Or Wetting Agents (AREA)

Claims (13)

1. Wässrige Suspensionen mit einem Gehalt von wenigstens 60 Gew.-% wenigstens eines festen Brennstoffes, dadurch gekennzeichnet, dass sie enthalten:
von 0,01 bis 1 Gew.-% wenigstens eines grenzflächenaktiven Mittels,
von 0,01 bis 1 Gew.-% wenigstens eines Dispergiermittels, ausgewählt unter Alaklimetallsilikaten, Alkalimetallpolyphosphaten und Alkalisalzen von organischen Polysäuren, und
von 0,01 bis 0,1 Gew.-% wenigstens eines Gelierungsmittels.
2. Wässrige Suspensionen nach Anspruch 1, dadurch gekennzeichnet, dass die Korngrössenverteilung des festen Brennstoffes ausserdem derart ist, dass 80 Gew.-% der Körner eine Abmessung unterhalb von 80 Mikrometer (µm) besitzen.
3. Wässrige Suspensionen nach einem der Ansprüche 1 und 2, dadurch gekennzeichnet, dass das grenzflächenaktive Mittel unter den anionischen, grenzflächenaktiven Mitteln ausgewählt ist.
4. Wässrige Suspensionen nach Anspruch 3, dadurch gekennzeichnet, dass das anionische, grenzflächenaktive Mittel ein Alkalimetallalkylarylsulfonat ist.
5. Wässrige Suspensionen nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass das als Dispergiermittel verwendete Alkalimetallsilikat Natriummetasilikat ist.
6. Wässrige Suspensionen nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, dass das Gelierungsmittel ein Zelluloseether ist.
7. Verfahren zur Herstellung von wässrigen Suspensionen nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, dass man den festen Brennstoff in feuchtem Medium mahlt und dass man zu der Mischung von festem Brennstoff und Wasser vor, während oder nach dem Mahlen zusetzt:
von 0,01 bis 1 Gew.-% wenigstens eines grenzflächenaktiven Mittels,
von 0,01 bis 1 Gew.-% wenigstens eines Dispergiermittels, ausgewählt unter Alkalimetallsilikaten, Alkalimetallpolyphosphaten und Alkalisalzen von organischen Polysäuren,
von 0,01 bis 0,1 Gew.-% wenigstens eines Gelierungsmittels, und
Wasser in ausreichender Menge, damit die erhaltene Suspension wenigstens 60 Gew.-% festen Brennstoff enthält.
8. Verfahren nach Anspruch 7, dadurch gekennzeichnet, dass man den festen Brennstoff mahlt, bis 80 Gew.-% der Körner eine Abmessung unterhalb von 80 Mikrometer (Ilm) besitzen.
9. Verfahren nach einem der Ansprüche 7 und 8, dadurch gekennzeichnet, dass das Wasser in einer solchen Menge zugesetzt wird, dass die erhaltene Suspension 60 bis 80 Gew.-% an festem Brennstoff enthält.
10. Verfahren nach einem der Ansprüche 7 bis 9, dadurch gekennzeichnet, dass man den festen Brennstoff in Anwesenheit eines die Zerkleinerung des festen Brennstoffes erleichternden Zusatzstoffes mahlt.
11. Verfahren nach einem der Ansprüche 7 bis 10, dadurch gekennzeichnet, dass der feste Brennstoff in den Schlämmen der Kohlewäsche enthalten ist.
12. Verfahren nach Anspruch 11, dadurch gekennzeichnet, dass die Schlämme vor dem Mahlen gereinigt werden, bis ihr Gehalt an nicht brennbaren Rückständen unterhalb von 10% liegt.
13. Verfahren nach Anspruch 12, dadurch gekennzeichnet, dass die Reinigung durch Flotation durchgeführt wird.
EP83400145A 1982-01-29 1983-01-21 Wässrige Suspensionen die zumindest einen festen Brennstoff enthalten und Verfahren zu dessen Herstellung Expired EP0086129B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8201421 1982-01-29
FR8201421A FR2520750B1 (fr) 1982-01-29 1982-01-29 Suspensions aqueuses d'au moins un combustible solide et un procede pour leur preparation

Publications (2)

Publication Number Publication Date
EP0086129A1 EP0086129A1 (de) 1983-08-17
EP0086129B1 true EP0086129B1 (de) 1986-03-12

Family

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EP83400145A Expired EP0086129B1 (de) 1982-01-29 1983-01-21 Wässrige Suspensionen die zumindest einen festen Brennstoff enthalten und Verfahren zu dessen Herstellung

Country Status (6)

Country Link
EP (1) EP0086129B1 (de)
JP (1) JPS58134189A (de)
CA (1) CA1189702A (de)
DE (1) DE3362486D1 (de)
ES (1) ES519360A0 (de)
FR (1) FR2520750B1 (de)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61225287A (ja) * 1985-03-29 1986-10-07 Tsuneo Masuda 炭化物水スラリ−およびその製造方法ならびに製造装置
AU612127B2 (en) * 1986-12-26 1991-07-04 Ube Industries, Ltd. Solid fuel-water slurry composition and process for the preparation of the same
DE3927567C2 (de) * 1989-08-21 1998-07-02 Aqualon Co Verwendung von hydrophob modifizierten Celluloseethern in wäßrigen Kohleaufschlämmungen und die so erhaltenen, stabilisierten Kohleaufschlämmungen
JPH04130805U (ja) * 1991-05-24 1992-12-01 株式会社日立工機原町 帯鋸盤における鋸車駆動ベルト緊張装置
CN105251464B (zh) * 2015-11-23 2017-07-04 河南华天环保科技有限公司 一种高效捕捉吸附去除烟尘的除尘改性剂

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0065259A2 (de) * 1981-05-15 1982-11-24 Pennsylvania Glass Sand Corporation Verfahren zur Herstellung einer brennbaren Kohle/Wasser-Mischung

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE430399C (de) * 1926-06-15 Johannes Bernardus Nachenius Verfahren und Vorrichtung zur Herstellung eines hochwertigen Brennstoffes aus abgesetztem Kohlenschlamm und Feinkohlen
CA1010931A (en) * 1973-07-05 1977-05-24 George A. Pouska Pipelining of dried coal-water slurries
US4045092A (en) * 1975-09-22 1977-08-30 The Keller Corporation Fuel composition and method of manufacture
US4104035A (en) * 1975-12-11 1978-08-01 Texaco Inc. Preparation of solid fuel-water slurries
GB1522575A (en) * 1976-06-24 1978-08-23 Texaco Development Corp Production of solid fuel-water slurries
US4217109A (en) * 1977-05-31 1980-08-12 Ab Scaniainventor Composition comprising a pulverized purified substance, water and a dispersing agent, and a method for preparing the composition

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0065259A2 (de) * 1981-05-15 1982-11-24 Pennsylvania Glass Sand Corporation Verfahren zur Herstellung einer brennbaren Kohle/Wasser-Mischung

Also Published As

Publication number Publication date
FR2520750A1 (fr) 1983-08-05
ES8405060A1 (es) 1984-05-16
EP0086129A1 (de) 1983-08-17
DE3362486D1 (en) 1986-04-17
JPS58134189A (ja) 1983-08-10
CA1189702A (fr) 1985-07-02
FR2520750B1 (fr) 1986-06-06
ES519360A0 (es) 1984-05-16

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