EP0029712A2 - Mehrstufenverfahren für die Verbesserung von Kohle - Google Patents

Mehrstufenverfahren für die Verbesserung von Kohle Download PDF

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Publication number
EP0029712A2
EP0029712A2 EP80304161A EP80304161A EP0029712A2 EP 0029712 A2 EP0029712 A2 EP 0029712A2 EP 80304161 A EP80304161 A EP 80304161A EP 80304161 A EP80304161 A EP 80304161A EP 0029712 A2 EP0029712 A2 EP 0029712A2
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EP
European Patent Office
Prior art keywords
coal
oil
water
order
micro
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
EP80304161A
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English (en)
French (fr)
Other versions
EP0029712A3 (en
EP0029712B1 (de
Inventor
Edward C. Capes
William L. Thayer
Richard D. Coleman
Leonard Messer
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.)
MESSER, LEONARD
Canadian Patents and Development Ltd
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Canadian Patents and Development Ltd
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Publication date
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Publication of EP0029712A2 publication Critical patent/EP0029712A2/de
Publication of EP0029712A3 publication Critical patent/EP0029712A3/en
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Publication of EP0029712B1 publication Critical patent/EP0029712B1/de
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Classifications

    • 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
    • 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
    • C10L1/322—Coal-oil suspensions

Definitions

  • This invention relates to an in-line,method for the beneficiation of coal and the formation of a coal-in-oil combustible fuel therefrcm.
  • the coal fines may contain significant proportions of hydrophilic (or oleophobic) impurity or ash-forming particles composed of silica, alumina, pyrite, etc. to which the functional groups of the light hydrocarbon oil bridging liquid are incapable of attaching themselves so that when the coal particle agglomerates are formed, these particles remain suspended in the water and are thus effectively separated from the coal particles.
  • hydrophilic (or oleophobic) impurity or ash-forming particles composed of silica, alumina, pyrite, etc.
  • Impurity-liberated, coal-in-oil suspensions would be a useful alternative fuel for existing oil-fired electrical generating facilities resulting in a saving in the oil consumption.
  • Other possible uses for these suspensions are marine fuels, fuels for industrial boilers and as injected fuels for blast furnaces.
  • Controlled moisture content could also be useful when the coal-in-oil suspension is subjected to vibratory energy such as, for example, in burners which use vibratory energy to increase the combustion efficiency in combustion chambers.
  • an in-line method for the beneficiation of coal and the formation of a coal-in-oil combustible fuel therefrom comprising:
  • FIG. 1 there is shown an in-line method for the beneficiation of coal and the formation of a coal-in-oil combustible fuel therefrom, comprising:
  • a dry pulverizer 28 is used for the initial stage of grinding since this will generally pulverize coal faster and in a smaller equipment volume than with wet methods, although wet grinding may be used throughout, if desired.
  • the coal is ground down to a required particle size sufficient to effect separation or dissociation of coal particles and impurities.
  • Coal to be pulverized is fed from a storage hopper 30 to the dry pulverizer 28 which is swept with air from a supply 32.
  • the swept air, with entrained pulverized coal is fed from the pulverizer 28 to a wet scrubber 34.
  • Water containing the pulverized coal is fed from the wet scrubber 34 to ti.e wet mill 1 while air, which has been scrubbed free from the pulverized coal in the wet scrubber 34, is exhausted therefrom at 36.
  • coal-in-water slurry 2 from the wet mill 1 is stirred in three mixing devices 4 to 6 arranged in cascade.
  • One mixing device could be used provided that the residence time for the coal of the coal-in-water slurry 2 therein to be micro-agglomerated is tolerable. With the embodiment shown in Figure 1, a residence time of four minutes was required and so the three mixing devices 4 to 6 were provided.
  • the first mixing device 4 is a high shear mixing device and may be a conventional turbine mixer.
  • the first mixing device 4 is used to disperse the light oil agglomerating liquid 8 in the coal-in-water slurry 2 and give an initial mixing.
  • the second and third mixing devices, 5 and 6 respectively, are relatively lower blade speed, intermediate intensity mixing devices as compared with the mixing device 4 and are for producing the micro-agglomerates. It should be noted that in different embodiments of the present invention, only one lower, intermediate-intensity mixing device is necessary and in other embodiments different mixing devices may be used, such as, for example, one or more emulsifying units with or without one or more lower, intermediate intensity mixing devices.
  • the light oil agglomerating liquid additive 8 is fed to the first mixing device 4 from a storage tank 38.
  • micro-agglomerated, impurity-liberated coal is separated from the dissociated components comprising primarily a large amount of inorganic impurities and some water on the screen 10, which in this embodiment is a stationary, inclined screen down which the separated, micro-agglomerated, impurity-liberated coal rolls and emerges as micro-agglomerates 12 while the dissociated inorganic impurities and water, designated 40, drain through the screen and are conveyed to a settling pond 42.
  • a vibrating screen separator or wet cyclone separator could be used at this stage if the micro-agglomerates possess sufficient strength not to break up in such apparatus.
  • the embodiment shown in Figure 1 is arranged to recycle most of the water from delivery 40 to the settling tank 42, together with make-up water 44 which is fed thereto.
  • the water 46 from the settling tank provides feed to the wet scrubber 34, wet mill 1 and the first mixing device 4. -
  • the micro-agglomerates 12 then pass to the mixing device 14 which is also a relatively lower blade speed, intermediate intensity mixing device as compared with the mixing device 4.
  • the relatively larger agglomerates are separated from the dissociated water and inorganic impurities on the vibrating screen 18 because the relatively larger agglomerates have sufficient strength not to break up on the vibrating screen 18, which is an efficient separator for the purpose.
  • a wet cyclone separator, other types of screens, etc., could also be used at this stage if desired.
  • the reason why the water portion 52 is returned to the mixing device 14 is to ensure that sufficient water is delivered, with the relatively larger agglomerates, to the vibrating screen 18 to ensure that the inorganic impurities are thoroughly washed from the relatively larger agglomerates. This substantially reduces the possibility of inorganic impurities being carried over the vibrating screen 18 with the relatively larger agglomerates.
  • the water in mixing device 14 would usually be heated to about 60°C to reduce the viscosity of the heavy fuel oil 16. Recirculation of water portion 52 avoids loss of thermal energy in discarded hot water.
  • the mixer 22, to which the relatively larger agglomerates 20 are conveyed in this embodiment is a stationary, cylindrical vessel having a mixing device rotating about a horizontal axis.
  • Other types of mixers may also be used such aa, for example, a paddle type mixer.
  • the coal-in-oil combustible fuel 26 is stored in an agitated condition in a holding tank 56 from which it is withdrawn by a pump 58 at the desired rate for consumption as a combustible fuel in, for example, an electrical power generating installation (not shown).
  • the method can be matched to the desired rate of consumption of the combustible fuel so that the holding tank 56 is merely provided for storage to accommodate any fluctuations in the production of the coal-in-oil combustible fuel or the consumption thereof.
  • Minto coal A typical analysis of the Minto coal is given below which shows that this is a coal having a high ash and sulphur content.
  • the weight ratio of air to coal fed to the dry pulveriser 28 was in the range 1.5:1 to 2:1. Of the order of 40 wt % coal and 60 wt % water were present in the wet mill 1.
  • the first mixing device 4 was fed of the order of 20 wt % coal, 3 wt % No. 2 fuel oil and 77 wt % water.
  • the plant was a pilot plant designed to be capable of treating 100 Imperial gallons/min. (455 1/min.) of slurry 2, which is equivalent to about 6 tons/hour (5.44 tonnes/ hour) of coal solids (including impurities) based on the 20 wt % slurry fed to the first mixing device 4.
  • the blades of the high shear mixing device 4 which were driven by a 5 HP motor at 3,220 rpm, comprised two groups of four high shear impeller blades, two of which are shown for each group and designated 60 to 63, which tapered radially outwardly towards truncated extremities.
  • the high shear impeller blades 60 and 62 were mounted in an 18 inch (0.46 m) internal diameter tank 64 having a 35 inch (0.89 m) height with an annular baffle 66 between the impeller blades 60 and 62 and four vertical baffles, two of which are shown and desiccated 68 and 70, equally spaced therearound to enhance their shearing effect on the coal-in-water slurry 2.
  • the four blades of each of the relatively lower blade speed, intermediate intensity mixing devices 5, 6 and 14, which were driven by a 5 HP motor at 280 rpm comprised pitched, turbine impeller blades two of which are shown and designated 72 and 74.
  • the blades 72 and 74 were mounted in a 40 in. (1.02 m) internal diameter vessel having a 40 in. (1.02 m) overflow height with four vertical baffles, two of which are shown and designated 76 and 78, equally spaced around the blades 72 and 74 to enhance their shearing effect.
  • the dissociated inorganic impurities and water, designated 40 mainly comprised of the order of 96 wt % water and 3 wt % ash and sulphur as the main inorganic impurities together with of the order of 1 wt % unagglomer- ated combustible matter.
  • the relatively larger agglomerates produced by mixer 14 comprised of the order of 70 wt % coal, 20 wt % oil and 10 wt % water to which was added sufficient No. 6 fuel oil in the mixer 22 for the coal-in-oil combustible fuel 26 to comprise a coal/oil weight ratio of 40/60.
  • Preferred light oils as agglomerating liquid are No. 2 fuel oil and diesel oil.
  • Other light oils as agglomerating liquid are, for example, light petroleum fractions, kerosene, coke oven light oil and light crude and residual and waste oils.
  • Preferred heavy fuel oils as agglomerating liquid are No. 6 fuel oil and heavy residual oils.
  • Other heavy fuel oils as agglomerating liquid are, for example, crude oils and coke oven tar.
  • the quantity of light oil agglomerating liquid additive usod will depend upon the type of coal being processed and how finely the coal must be ground to produce impurity-liberated coal particles. While a greater quantity of light oil agglomerating liquid additive could be used than of the order of 20 wt % of the total weight of solids of the coal-in-water slurry the desirable thing according to the present invention is that only of the order of up to 20 wt % need be used so that the final coal-in-oil combustible fuel will contain,for example, the maximum amount of heavy oil for which an oil-fired installation was originally designed, when the coal-in-oil combustible fuel is for use in this manner.

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  • 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)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Liquid Carbonaceous Fuels (AREA)
  • Solid Fuels And Fuel-Associated Substances (AREA)
EP19800304161 1979-11-22 1980-11-20 Mehrstufenverfahren für die Verbesserung von Kohle Expired EP0029712B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CA000340749A CA1117884A (en) 1979-11-22 1979-11-22 In-line method for the beneficiation of coal and the formation of a coal-in-oil combustible fuel therefrom
CA340749 1979-11-22

Publications (3)

Publication Number Publication Date
EP0029712A2 true EP0029712A2 (de) 1981-06-03
EP0029712A3 EP0029712A3 (en) 1981-11-11
EP0029712B1 EP0029712B1 (de) 1984-07-25

Family

ID=4115706

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19800304161 Expired EP0029712B1 (de) 1979-11-22 1980-11-20 Mehrstufenverfahren für die Verbesserung von Kohle

Country Status (3)

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EP (1) EP0029712B1 (de)
CA (1) CA1117884A (de)
DE (1) DE3068727D1 (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2526680A2 (fr) * 1978-12-04 1983-11-18 American Minechem Corp Procede de transformation de matieres charbonneuses en une charge d'alimentation amelioree
US4726810A (en) * 1984-05-23 1988-02-23 Her Majesty The Queen In Right Of The Province Of Alberta As Represented By The Minister Of Energy And Natural Resources Process for the selective agglomeration of sub-bituminous coal fines
WO1990012078A1 (en) * 1989-03-31 1990-10-18 Union Oil Company Of California Separable coal-in-oil mixtures having controlled sedimentation properties and method for making same
US5096461A (en) * 1989-03-31 1992-03-17 Union Oil Company Of California Separable coal-oil slurries having controlled sedimentation properties suitable for transport by pipeline

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4730787A (en) * 1984-06-19 1988-03-15 The University Of Toronto Innovations Foundation Method of separating solids by simultaneous comminution and agglomeration

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3665066A (en) * 1969-11-28 1972-05-23 Canadian Patents Dev Beneficiation of coals
NL7609905A (nl) * 1975-09-09 1977-03-11 Shell Int Research Werkwijze ter bereiding van een suspensie van deeltjes in een koolwaterstofolie.

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2526680A2 (fr) * 1978-12-04 1983-11-18 American Minechem Corp Procede de transformation de matieres charbonneuses en une charge d'alimentation amelioree
US4726810A (en) * 1984-05-23 1988-02-23 Her Majesty The Queen In Right Of The Province Of Alberta As Represented By The Minister Of Energy And Natural Resources Process for the selective agglomeration of sub-bituminous coal fines
WO1990012078A1 (en) * 1989-03-31 1990-10-18 Union Oil Company Of California Separable coal-in-oil mixtures having controlled sedimentation properties and method for making same
US5096461A (en) * 1989-03-31 1992-03-17 Union Oil Company Of California Separable coal-oil slurries having controlled sedimentation properties suitable for transport by pipeline

Also Published As

Publication number Publication date
EP0029712A3 (en) 1981-11-11
DE3068727D1 (en) 1984-08-30
EP0029712B1 (de) 1984-07-25
CA1117884A (en) 1982-02-09

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