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EP0118440A1 - Dispersion charbon-eau et son procede d'obtention. - Google Patents

Dispersion charbon-eau et son procede d'obtention.

Info

Publication number
EP0118440A1
EP0118440A1 EP82903239A EP82903239A EP0118440A1 EP 0118440 A1 EP0118440 A1 EP 0118440A1 EP 82903239 A EP82903239 A EP 82903239A EP 82903239 A EP82903239 A EP 82903239A EP 0118440 A1 EP0118440 A1 EP 0118440A1
Authority
EP
European Patent Office
Prior art keywords
dispersion
coal
substance
polymers
weight
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.)
Granted
Application number
EP82903239A
Other languages
German (de)
English (en)
Other versions
EP0118440B1 (fr
Inventor
Lars Lennart Stigsson
Bjoern Lindman
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.)
Fluidcarbon International AB
Original Assignee
Fluidcarbon International AB
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
Priority claimed from PCT/SE1982/000107 external-priority patent/WO1983000500A1/fr
Application filed by Fluidcarbon International AB filed Critical Fluidcarbon International AB
Publication of EP0118440A1 publication Critical patent/EP0118440A1/fr
Application granted granted Critical
Publication of EP0118440B1 publication Critical patent/EP0118440B1/fr
Expired legal-status Critical Current

Links

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, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
    • 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 coal-water dispersion which is ve ry stable in storage and is suitable for transport and direct energy production without preceding dewatering. More particularly the invention relates to a dispersion comprising water, pulverized coal and additive, the coal content amounting to at least 60 % by weight.
  • a dispersion of coal is considerably less polluting and can be more easily handled than solid coal and also eliminates some risks involved in transport and storage. Such a dispersion is also preferred from an economical point of view.
  • the reason for using coal dispersions is the planned increased use of coal as a basic energy source in large as well as small plants for producing electricity, steam and heat.
  • Physical conversion is another method of transferring the coal into liquid form, and the invention relates to this method. It is practised by dispersing the coal in a liquid which may consist of water as in the case of the dispersion of the invention, or of some organic fuel such as heating oil, methanol, etc.
  • the main problem of water dispersions of pulverized coal is to make the dispersion stable at low viscosity.
  • the coal particles must not sediment during storage or transport of the coal-water dispersion.
  • the coal-water dispersion shall have a high pumpability and shall have rheological properties so as to be suitable for burning by conventional technique probably modified to a minor degree.
  • anionic surfactants and at least one electrolyte among other additives are used to prevent sedimentation and improve rheology. Tests have shown that the sedimentation stability as well as the rheological properties do not satisfy the desired demands.
  • the dispersion according to the invention is characterized in that the dispersion contains at least one substance adsorbed to the surfaces of the coal particles, which provides repulsion between the coal particles by hydration forces.
  • said substance comprises a zwitterionic amphiph ⁇ le.
  • the invention also provides a method of manufacturing the dispersion, wherein said substance providing the repulsion between the coal particles by hydration forces is supplied to the pulverized coal either dispersed in water or dissolved in an organic solvent.
  • the dispersion has rheological properties wh i ch allow the dispersion to be pumped and transported through pipelines at a greatly reduced friction, and above all has a considerably improved stability against flocculation as well as sedimentation.
  • the dispersion moreover has such properties that it can be atomized without forming aggl omerates in a suitable burner equipment.
  • coal-water dispersions which by definition are thermodynamically instable, are being stabilized the sedimentation and aggregation rates are reduced by creating a barrier which counteracts the particle attraction.
  • This repulsive effect can be achieved by three main principles: electrostatic stabilization, sterical stabilization, and stabilization by means of hydration forces.
  • the stabilization changes the energy of the particles and/or creates a high barrier preventing particle attraction. On the basis of these principles it is possible to stabilize high contents of coal particles in a water medium by the addition of small amounts of organic additives.
  • a non-micelle-forming zwitterionic surfactant such as lecithin or an alkylbetain, which is thus relatively difficult to dissolve in water, is first dissolved in an organic solvent.
  • the solvent can consist of for example octanol, hexadecaneor methanol and can be recovered in a suitable manner or can comprise an insignificant portion by weight of the dispersion.
  • the surfactant can be dispersed directly in water probably in the form of a lamellar liquid crystalline phase, or can be dissolved in water by the addition of an additive having the property of creating soluble mixed aggregates with lecithin.
  • the surfactant preparation is added to a dis persion of pulverized coal or in connection with the pulverization step.
  • the pulverized coal can be produced by wet grinding solid coal, the pulverized coal thus obtained being beneficiaated and dewatered.
  • the surfactant preparation can be added to the pulverized coal in the process of grinding as a grinding aid or in the process of remediation as a flotation reagent making the coal surface more hydrophobic or after the process of dewatering.
  • Suitable fractions of the coal powder in the final product range from 1 to 200 yum (preferably ⁇ 150 ⁇ m) with a broad size distribution (polydispersed coal powder).
  • Optimum packing is obtained according to Fuller.
  • the smaller particle size the greater stability but it is expensive to grind coal down to submicron particle sizes.
  • the particle concentration can be varied within a broad range.
  • Coal-water dispersions with a dry substance content between 65 and 80 % by weight are of particular interest because these dispersions have a high, energy content and good rheological properties for example for transport in pipelines.
  • the size distribution must be particularly taken into account. In the normal case this can be done on the basis of simple geometrical considerations as to the minimization of the free volume when packing particles of different sizes. It is also possible to add larger coal particles in the range from 0.5 to 5 mm to a dispersion in order to obtain in this manner a more energy-rich coal-water dispersion, particularly in view of transporting.
  • Another possibility according to the invention includes addition of oil to the slurry (0 - 10 % ) either in the pulverization step or later to improve flame stability when the slurry is being burnt, especially in small scale applications.
  • hydro philic anionic or non-ionic polymers may be added to the dispersion in order to provide some form of a steric barrier and in order to reduce the friction between the particles.
  • polyethers polysaccharides, polyalcohols and polyacrylates.
  • Particularly suitable according to the invention are polyethyleneoxide, copolymers of the polyethyleneoxide- -polypropyleneoxide type, carboxymethylcellulose, xanthan gum, and polymers of the type block or graft copolymers with balanced hydrophilic-lipophilic content.
  • concentration of polymers in percent by weight based on the total weight can be varied between 0.1 and 5 % but is economically optimal at about 0.5 % .
  • the salt is calcium hydroxide or dolomite powder.
  • the salt neutralizes acid gas components generated at the oxidation of the fuel and can be recovered in a particle percipitator.
  • an agent can be added to the dispersion which forms a monomolecul ar layer in the interface.
  • an agent is cetyl alcohol or hexadecanol.
  • the invention provides substantial advantages over the prior art technique of stabilizing coal particles in water. Due to an excellent sedimentation stability combined with favourable rheological properties for pumping, the dispersion obtained is well suited for transport ing coal in an appropriate manner in conduits or pipelines for use for example in the chemical industry or for direct energy production. Combustion tests in boilers designed for heavy oil have shown that the dispersion is very suitable to replace oil completely or partly.

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)
  • Colloid Chemistry (AREA)
  • Liquid Carbonaceous Fuels (AREA)
  • Solid Fuels And Fuel-Associated Substances (AREA)
  • Emulsifying, Dispersing, Foam-Producing Or Wetting Agents (AREA)

Abstract

Dispersion contenant de l'eau, du charbon pulvérisé et des additifs et qui est en outre stable pendant le stockage, peut être pompée et brûlée par une technique conventionnelle. La teneur en charbon de la dispersion se situe entre 60 et 85 % en poids et la dispersion contient au moins une substance adsorbée sur les surfaces des particules de charbon, ce qui provoque une répulsion entre les particules de charbon sous l'action des forces d'hydratation.
EP82903239A 1982-04-05 1982-11-12 Dispersion charbon-eau et son procede d'obtention Expired EP0118440B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
WOPCT/SE82/00107 1982-04-05
PCT/SE1982/000107 WO1983000500A1 (fr) 1981-08-03 1982-04-05 Dispersion charbon-eau

Publications (2)

Publication Number Publication Date
EP0118440A1 true EP0118440A1 (fr) 1984-09-19
EP0118440B1 EP0118440B1 (fr) 1988-03-02

Family

ID=20345679

Family Applications (2)

Application Number Title Priority Date Filing Date
EP82903239A Expired EP0118440B1 (fr) 1982-04-05 1982-11-12 Dispersion charbon-eau et son procede d'obtention
EP83900669A Withdrawn EP0105878A1 (fr) 1982-04-05 1983-02-04 Dispersion charbon-eau et son procede de production

Family Applications After (1)

Application Number Title Priority Date Filing Date
EP83900669A Withdrawn EP0105878A1 (fr) 1982-04-05 1983-02-04 Dispersion charbon-eau et son procede de production

Country Status (11)

Country Link
EP (2) EP0118440B1 (fr)
JP (1) JPS59500520A (fr)
AU (1) AU1223183A (fr)
BR (1) BR8306789A (fr)
CA (1) CA1216425A (fr)
DK (1) DK558483A (fr)
ES (1) ES8402341A1 (fr)
FI (1) FI834462L (fr)
IT (1) IT1207967B (fr)
NO (1) NO834432L (fr)
WO (2) WO1983003617A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0118440B1 (fr) * 1982-04-05 1988-03-02 Fluidcarbon International Ab Dispersion charbon-eau et son procede d'obtention

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT370763B (de) * 1977-05-31 1983-05-10 Scaniainventor Ab Kohlensuspension, enthaltend pulverisierte kohle, wasser und dispergierungsmittel, sowie verfahren zur herstellung derselben
US4242098A (en) * 1978-07-03 1980-12-30 Union Carbide Corporation Transport of aqueous coal slurries
US4282006A (en) * 1978-11-02 1981-08-04 Alfred University Research Foundation Inc. Coal-water slurry and method for its preparation
US4326855A (en) * 1979-11-08 1982-04-27 Cottell Eric Charles Process for beneficiating and stabilizing coal/oil/water fuels
GB2087862B (en) * 1980-11-18 1984-08-01 Dearborn Chemicals Ltd Process for dispersing particulate material in aqueous systems
US4358293A (en) * 1981-01-29 1982-11-09 Gulf & Western Manufacturing Co. Coal-aqueous mixtures
SE436136B (sv) * 1981-08-03 1984-11-12 Fluidcarbon Ab Kol-vattendispersion med additiv bestaende av zwitterjonisk tensid och dermed samverkande hydrofila polymerer
JPS5840392A (ja) * 1981-09-04 1983-03-09 Sumitomo Chem Co Ltd 石炭組成物
EP0118440B1 (fr) * 1982-04-05 1988-03-02 Fluidcarbon International Ab Dispersion charbon-eau et son procede d'obtention

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO8303617A1 *

Also Published As

Publication number Publication date
ES519418A0 (es) 1984-01-16
IT8224584A0 (it) 1982-12-03
JPS59500520A (ja) 1984-03-29
WO1983003617A1 (fr) 1983-10-27
CA1216425A (fr) 1987-01-13
DK558483D0 (da) 1983-12-05
AU1223183A (en) 1983-11-04
WO1983003618A1 (fr) 1983-10-27
EP0105878A1 (fr) 1984-04-25
NO834432L (no) 1983-12-02
FI834462A0 (fi) 1983-12-05
ES8402341A1 (es) 1984-01-16
EP0118440B1 (fr) 1988-03-02
DK558483A (da) 1983-12-05
BR8306789A (pt) 1984-03-07
IT1207967B (it) 1989-06-01
FI834462L (fi) 1983-12-05

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