EP0025279A2 - Verfahren zur Herstellung einer gleichmässigen Dispersion eines festen Brennstoffs in Öl - Google Patents

Verfahren zur Herstellung einer gleichmässigen Dispersion eines festen Brennstoffs in Öl Download PDF

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Publication number
EP0025279A2
EP0025279A2 EP80302760A EP80302760A EP0025279A2 EP 0025279 A2 EP0025279 A2 EP 0025279A2 EP 80302760 A EP80302760 A EP 80302760A EP 80302760 A EP80302760 A EP 80302760A EP 0025279 A2 EP0025279 A2 EP 0025279A2
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EP
European Patent Office
Prior art keywords
oil
solid fuel
coal
solid
dispersion
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Granted
Application number
EP80302760A
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English (en)
French (fr)
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EP0025279B1 (de
EP0025279A3 (en
Inventor
Christopher John Veal
Derek Richard Wall
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BP PLC
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BP PLC
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Publication date
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Publication of EP0025279A2 publication Critical patent/EP0025279A2/de
Publication of EP0025279A3 publication Critical patent/EP0025279A3/en
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Publication of EP0025279B1 publication Critical patent/EP0025279B1/de
Expired legal-status Critical Current

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    • 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
    • C10L1/324—Dispersions containing coal, oil and water
    • 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
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B5/00—Making pig-iron in the blast furnace
    • C21B5/001—Injecting additional fuel or reducing agents
    • C21B5/003—Injection of pulverulent coal
    • C21B5/004—Injection of slurries

Definitions

  • This invention relates to the preparation of dispersions of solid fuels in liquid fuels in tumbling ball mills and, more particularly, to the preparation of dispersions of coal in oil.
  • Our British Patent Specification No. 1523193 discloses a method for the preparation of coal oil dispersions which method comprises grinding coal in a medium consisting essentially of gas oil and/or a heavier petroleum fraction until the particle size is reduced to a value below 10 micron and the dispersion contains 15 to 55% by weight coal expressed as a percentage by weight of the total dispersion.
  • 1523193 discloses that grinding can be carried out in vibratory or agitatory ball mills.
  • Tumbling ball mills are, of course, well known grinding machines and have been used in the past in both batch and continuous processes. They have been used primarily for the dry grinding of friable solids such as cement clinker. In certain applications, however, it is desirable to grind in the wet state, that is, when the solids are suspended in a liquid forming a slurry.
  • the liquid concerned is normally water.
  • An example of such a process is the beneficiation of metal bearing ores.
  • light hydrocarbon fractions are employed. The latter tend to be batch processes, however, carried out on a small scale.
  • colloidal fuel may be prepared by grinding coal in oil in tube mills.
  • the term "colloidal fuel” was used loosely at that time to describe relatively coarse suspensions of coal in oil.
  • the most relevant fuel described contained coal particles ground so that at least 90% passed through a 100 mesh screen (B.S.S.) and 85% through a 200 mesh screen (B.S.S.).
  • Such dimensions are far in excess of colloidal dimensions quoted by Glasstone as being in the range 0.2-0.005 micron. (Glasstone,Textbook of Physical Chemistry, Second Edition, Macmillan & Co. Ltd., London, 1953, page 1232.)
  • a method for the preparation of a uniform solid fuel-oil dispersion which method comprises grinding the solid fuel in an oil medium in a tumbling ball mill until the mean solid particle size is reduced to a value in the range 1 to 10 micron, preferably 2 to 5 micron, and the dispersion contains 15 to 55% by weight solid fuel, preferably 30 to 45%, expressed as a percentage by weight of the total dispersion.
  • Suitable friable solids include coals of various ranks, solvent refined coal, coal coke and petroleum coke.
  • the preferable friable solid is bituminous coal.
  • a suitable oil is a petroleum fuel oil fraction having a viscosity of not more than 6000 seconds, preferably not more than 3500 seconds Redwood No. 1 at 100°F (37.8°C).
  • the required viscosity may be achieved by "cutting back" if necessary with, for example, gas oil.
  • the tumbling ball mill is preferably operated under standard tumbling ball mill conditions, i.e. with the balls occupying 10-50%, most preferably 30-45%, of the internal volume, with the mixture of solid fuel and oil occupying 5 to 45%, and the speed of rotation of the mill about 60 to 95%, preferably 70 to 80%, of the critical speed which is defined as the lowest speed at which a single element of the charge would be held against the internal surface by centrifugal force.
  • this atmosphere will normally be air.
  • an inert blanket e.g. of nitrogen. This has the further advantage of eliminating the risk of forming hazardous vapour mixtures.
  • Inert gas blanketing is particularly advantageous when grinding at relatively high temperatures, e.g. close to or above the flash point of the oil.
  • the solid fuel supplied to the tumbling ball mill is preground to a particle size not greater than 250 micron. This may be achieved by conventional size reducing machinery such as atritors, hammer mills, etc.
  • lump coal can be supplied to the ball mill and ground down to its final size within the mill.
  • a large tumbling ball mill often known as a tube mill, e.g., having a length to diameter ratio of greater than 3:1,it may be desirable to subdivide the mill into a number of compartments separated by screens through which the mixture can flow.
  • the size of the balls is progressively reduced from the inlet chamber to the outlet chamber.
  • Ball mills usually contain steel balls and these are suitable for the present purpose.
  • the dispersions will generally be prepared, used and stored at elevated temperature and under these conditions will be more stable than corresponding dispersions prepared in the presence of air.
  • the solid fuel-oil dispersions are suitable for use in blast furnaces, cement kilns and in industrial, marine and utility boilers.
  • the stability of the solid fuel-oil dispersion is a function of three important variables - the method of grinding, the final particle size and the concentration of solid in oil. If all three are chosen correctly then the dispersion is of enhanced stability at elevated and ambient temperatures.
  • the dispersion is in the form of a weak, thixotropic gel in which a physical network is formed by solid particles in oil. It is a uniform structure from which the solid particles cannot settle out because they form part of it. This is unlike coal oil dispersions prior to those disclosed in 1523193 which were merely slurries in which the coal particles were suspended in the oil from which they would eventually settle out, or colloidal suspensions.
  • the solid particles are not ground in the oil in the absence of air, the solid particles will become oxidised and interact unfavourably. If the solid particle size is too great, forces will be insufficient to confer stability.
  • the concentration of the solid particles is also critical. If it is too low, the dispersion will be unstable. If it is too high, the dispersion will become too solid like for pumping.
  • the coal was passed through the pregrinding system described with reference to the drawing and passed to storage 6, with a maximum particle size of 212 microns.
  • the oil from storage at 80°C was passed through the heater 8 where its temperature was raised to 120°C.
  • the mill was operated at a speed of 24 rpm (80% critical).
  • the mean particle size of the coal after grinding was 3.7 micron as determined by an optical microscope technique.
  • a sample of the dispersion prepared above showed no signs of settling after standing for 24 hours at 100°C.
  • Lump coal. is supplied by line 1 to a screen 2 which passes lumps of size below 6.4mm to an atritor 3 which reduces the particle size to 70% wt below 200 mesh. Oversize lumps from the screen 2 are reduced in size in a jaw-crusher 4 and returned to the screen 2. Particles from the atritor 3 move to a classifier 5 from which particles below 212 microns in size are passed by an air lift to storage 6 and oversize particles are returned to the atritor 3 for further comminution.
  • Oil is supplied by line 7, passed through a heater 8 and powdered coal from storage 6 is added to the oil at the entry to a tumbling ball mill 9.
  • the mill is divided into three chambers separated by screens 10 and 11.
  • the mill supplied with nitrogen by means (not shown) to provide an inert atmosphere within the mill.
  • the coal-oil mixture passes continuously through the chambers of the mill and is removed by line 12.
  • the oil was a mixed source heavy fuel oil with a viscosity of 3500 seconds Redwood No. 1 at 100°F (37.8°C). It had the following properties:

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Dispersion Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Liquid Carbonaceous Fuels (AREA)
  • Solid Fuels And Fuel-Associated Substances (AREA)
  • Crushing And Grinding (AREA)
EP80302760A 1979-08-15 1980-08-12 Verfahren zur Herstellung einer gleichmässigen Dispersion eines festen Brennstoffs in Öl Expired EP0025279B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB7928409 1979-08-15
GB7928409 1979-08-15

Publications (3)

Publication Number Publication Date
EP0025279A2 true EP0025279A2 (de) 1981-03-18
EP0025279A3 EP0025279A3 (en) 1981-09-09
EP0025279B1 EP0025279B1 (de) 1984-03-14

Family

ID=10507218

Family Applications (2)

Application Number Title Priority Date Filing Date
EP80302759A Ceased EP0025278A3 (de) 1979-08-15 1980-08-12 Verfahren zur Herstellung einer gleichmässigen Dispersion aus bröckligem festem Brennstoff, Öl und Wasser und die erhaltene Dispersion aus Brennstoff, Öl und Wasser
EP80302760A Expired EP0025279B1 (de) 1979-08-15 1980-08-12 Verfahren zur Herstellung einer gleichmässigen Dispersion eines festen Brennstoffs in Öl

Family Applications Before (1)

Application Number Title Priority Date Filing Date
EP80302759A Ceased EP0025278A3 (de) 1979-08-15 1980-08-12 Verfahren zur Herstellung einer gleichmässigen Dispersion aus bröckligem festem Brennstoff, Öl und Wasser und die erhaltene Dispersion aus Brennstoff, Öl und Wasser

Country Status (7)

Country Link
EP (2) EP0025278A3 (de)
JP (2) JPS5636592A (de)
KR (2) KR830003567A (de)
AU (2) AU6133280A (de)
DE (1) DE3066980D1 (de)
PL (2) PL125850B1 (de)
ZA (2) ZA804725B (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0042726A2 (de) * 1980-06-19 1981-12-30 The British Petroleum Company p.l.c. Brennstoffzusammensetzung
RU2611630C1 (ru) * 2016-04-26 2017-02-28 Федеральное государственное бюджетное образовательное учреждение высшего образования "Московский технологический университет" Способ приготовления водосодержащей топливно-угольной суспензии

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2131453A (en) * 1982-06-10 1984-06-20 Otisca Ind Ltd Coal compositions
JPS61271395A (ja) * 1985-05-27 1986-12-01 Universal Gijutsu Kaihatsu Kenkyusho:Kk 複合燃料
JPS62213015A (ja) * 1986-03-13 1987-09-18 オリンパス光学工業株式会社 防水型電気接点
JPS6440289U (de) * 1987-09-04 1989-03-10
EP3237584A4 (de) * 2014-12-23 2018-07-18 Rhodia Operations Flüssige biokraftstoffzusammensetzungen
BR112019009623A2 (pt) * 2016-11-11 2019-09-10 Earth Tech Usa Limited partículas de hidrocarboneto sólido derivado de carvão
PL240448B1 (pl) 2019-05-22 2022-04-04 Univ Technologiczno Przyrodniczy Im Jana I Jedrzeja Sniadeckich Sposób aktywizacji mieszanki liofilizowanych acidofilnych bakterii kwasu mlekowego przeznaczonych do niskotemperaturowej dekontaminacji ochratoksyny A w krwi spożywczej

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2343039A1 (fr) * 1976-03-05 1977-09-30 British Petroleum Co Melanges d'huiles et de houille

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR774915A (fr) * 1933-06-23 1934-12-17 Procédé d'obtention de combustibles
GB454796A (en) * 1935-04-08 1936-10-08 Sutton Manor Collieries Ltd Improvements in the manufacture of fuel and the fuel thereby produced
DE887560C (de) * 1943-05-01 1953-08-24 Bergwerksverband Zur Verwertun Verfahren zur Herstellung von Fliesskohle
US4030894A (en) * 1975-06-30 1977-06-21 Interlake, Inc. Stabilized fuel slurry
US4153421A (en) * 1976-05-17 1979-05-08 Interlake, Inc. Stabilized fuel slurry

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2343039A1 (fr) * 1976-03-05 1977-09-30 British Petroleum Co Melanges d'huiles et de houille

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
"COMMINUTION", p. 23 and fig. 3, Edit.: V.C. MARSHALL, publ. by Inst. of Chemical Engineers, 1975 *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0042726A2 (de) * 1980-06-19 1981-12-30 The British Petroleum Company p.l.c. Brennstoffzusammensetzung
EP0042726A3 (de) * 1980-06-19 1982-04-21 The British Petroleum Company p.l.c. Brennstoffzusammensetzung
RU2611630C1 (ru) * 2016-04-26 2017-02-28 Федеральное государственное бюджетное образовательное учреждение высшего образования "Московский технологический университет" Способ приготовления водосодержащей топливно-угольной суспензии

Also Published As

Publication number Publication date
AU6133380A (en) 1981-02-19
ZA804725B (en) 1982-03-31
KR830003569A (ko) 1983-06-21
EP0025278A2 (de) 1981-03-18
AU6133280A (en) 1981-02-19
PL226236A1 (de) 1981-04-24
DE3066980D1 (en) 1984-04-19
KR830003567A (ko) 1983-06-21
EP0025279B1 (de) 1984-03-14
PL125850B1 (en) 1983-06-30
JPS5636592A (en) 1981-04-09
PL226237A1 (de) 1981-04-24
EP0025279A3 (en) 1981-09-09
ZA804726B (en) 1982-03-31
EP0025278A3 (de) 1981-09-02
JPS5628291A (en) 1981-03-19

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