GB2068056A - A method of transporting coal as a coal/water slurry through a pipeline - Google Patents

A method of transporting coal as a coal/water slurry through a pipeline Download PDF

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Publication number
GB2068056A
GB2068056A GB8002009A GB8002009A GB2068056A GB 2068056 A GB2068056 A GB 2068056A GB 8002009 A GB8002009 A GB 8002009A GB 8002009 A GB8002009 A GB 8002009A GB 2068056 A GB2068056 A GB 2068056A
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United Kingdom
Prior art keywords
coal
particles
particle size
water
slurry
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.)
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Application number
GB8002009A
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Shell Internationale Research Maatschappij BV
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Shell Internationale Research Maatschappij BV
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Publication date
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Priority to GB8002009A priority Critical patent/GB2068056A/en
Publication of GB2068056A publication Critical patent/GB2068056A/en
Withdrawn legal-status Critical Current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, 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
    • B65G53/00—Conveying materials in bulk through troughs, pipes or tubes by floating the materials or by flow of gas, liquid or foam
    • B65G53/30—Conveying materials in bulk through pipes or tubes by liquid pressure

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Mechanical Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Liquid Carbonaceous Fuels (AREA)

Abstract

A method of transporting coal as a coal/water slurry through a pipeline, wherein the coal in the slurry comprises at least 95% by weight of coal particles having a particle size smaller than 700 mu m and at most 10% by weight of coal particles having a particle size smaller than 44 mu m (see Figure).

Description

SPECIFICATION A method of transporting coal as a coal/water slurry through a pipeline The invention relates to a method of transporting coal as a coal/water slurry through a pipeline.
It is known to prepare a mixture of water and relatively small coal particles and to transport the mixture or slurry as formed through a pipeline, for example, from a coal mine to another location, whereafter the coal is separated from all or most of the water to obtain a coal product suitable for consumption or for further transport by rail or by ship.
It is an object of the invention to provide a method of transporting a coal/waterslurrythrough a pipeline, wherein the particle size distribution of the coal particles in the coal/water slurry is so selected that a coal/water slurry is obtained which, from a technical and economical point of view, is very suitable for transport through a pipeline and for further treatment after the pipeline transport.
In the present patent specification and in the claims pertaining thereto, the expression "particle size" means the largest dimension of a particle.
For this purpose, the invention relates to a method of transporting coal as a coal/water slurry through a pipeline, wherein the coal in the slurry comprises at least 95% by weight of coal particles having a particle size smaller than 700 Ftm and at most 10% by weight of coal particles having a particle size smallerthan 44 cm.
In an attractive embodiment of the above method, the coal in the slurry comprises at least 95% by weight of coal particles having a particle size smaller than 300 ijm.
In other attractive embodiments of the above methods, the coal in the slurry comprises at most 5% by weight of coal particles having a particle size smaller than 44 Ftm.
The quantity of water in the coal/water slurry is so selected that the slurry contains 10 to 50% by volume of coal particles in water.
The main advantages obtained by the method according to the invention are that, on the one hand the pressure losses and thus the energy consumption during the pipeline transport are relatively small, and that on the other hand the separation of the coal particles from the water by mechanical means is not too difficult and not too expensive.
Generally, it can be said that, during slurry pipeline transport the pressure losses and thus the energy consumption are lowest when the coal particles in the slurry have a small particle size, but not smaller than 10 Ftm. However, the separation of the coal particles from the water by mechanical means at the end of the pipeline is easiest when the particle size of the coal particles is relatively large.
In the method according to the invention use is made of a coal/water slurry wherein the particle size distribution of the coal particles is so selected that optimum conditions are obtained both in relation to energy consumption during pipeline transport and in relation to ease of separation of the coal particles from the water by mechanical means at the end of the pipeline.
The desired particle size distribution can be obtained by a combined operation of grinding and classifying of coal.
Also unwanted oversized or undersized particles could be removed from the mill output. The oversized particles could be further ground while the undersized particles could be used as a fuel. The fraction of unwanted undersized particles that cannot be used for the above application could be discarded or could be agglomerated to particles largerthan 44 cam.
More in particular, by grinding and classifying of coal, a coal product can be obtained comprising at least 95% by weight of coal particles having a particle size smaller than 700 Itm and at most 10% by weight of coal particles having a particle size smaller than 44 Ftm.
If desired, it is possible to carry out the said grinding and classifying operation in such a way that the above-mentioned value of 700 Ftm is replaced by 300 Ftm and/or said value of 10% is replaced by 5%.
The coal product obtained is mixed with a certain quantity of water, so as to produce a coal/water slurry containing 10 to 50% by volume of coal particles in water. This slurry is transported through a pipeline and at the end of the pipeline the coal particles are separated from the water by mechanical al means, for example by means of a centrifuge or by means of suitable sieves.
The diagram according to the figure shows some possible particle size distributions of the coal.
Along the lower horizontal axis of the diagram Tyler Standard Screens (TSS) are indicated in Mesh and along the upper horizontal axis of the diagram Sieve Openings (SO) are indicated in ym.
Along the vertical axis of the diagram coal particles retained on the screens are indicated in % by weight (Wr).
The curve I indicates a first possible particle size distribution of coal particles to be used in a coal/ water slurry according to the invention. Curves Il-IIA respectively Il-IIB indicate respectively second and third particle size distributions of coal particles to be used in the slurry according to the invention.
1. A method of transporting coal as a coal/water slurry through a pipeline, wherein the coal in the slurry comprises at least 95% by weight of coal particles having a particle size smaller than 700 Ftm and at most 10% by weight of coal particles having a particle size smaller than 44 ptm.
2. The method as claimed in claim 1, wherein the coal in the slurry comprises at least 95% by weight of coal particles having particle size smaller than 300 Ftm.
3. The method as claimed in any one of the claims 1 to 2, wherein the coal in the slurry comprises at most 5% by weight of coal particles having a particle size smaller than 44 Ftm.
4. The method as claimed in any one of the claims 1 to 3, wherein the coal/water slurry contains
**WARNING** end of DESC field may overlap start of CLMS **.

Claims (12)

**WARNING** start of CLMS field may overlap end of DESC **. SPECIFICATION A method of transporting coal as a coal/water slurry through a pipeline The invention relates to a method of transporting coal as a coal/water slurry through a pipeline. It is known to prepare a mixture of water and relatively small coal particles and to transport the mixture or slurry as formed through a pipeline, for example, from a coal mine to another location, whereafter the coal is separated from all or most of the water to obtain a coal product suitable for consumption or for further transport by rail or by ship. It is an object of the invention to provide a method of transporting a coal/waterslurrythrough a pipeline, wherein the particle size distribution of the coal particles in the coal/water slurry is so selected that a coal/water slurry is obtained which, from a technical and economical point of view, is very suitable for transport through a pipeline and for further treatment after the pipeline transport. In the present patent specification and in the claims pertaining thereto, the expression "particle size" means the largest dimension of a particle. For this purpose, the invention relates to a method of transporting coal as a coal/water slurry through a pipeline, wherein the coal in the slurry comprises at least 95% by weight of coal particles having a particle size smaller than 700 Ftm and at most 10% by weight of coal particles having a particle size smallerthan 44 cm. In an attractive embodiment of the above method, the coal in the slurry comprises at least 95% by weight of coal particles having a particle size smaller than 300 ijm. In other attractive embodiments of the above methods, the coal in the slurry comprises at most 5% by weight of coal particles having a particle size smaller than 44 Ftm. The quantity of water in the coal/water slurry is so selected that the slurry contains 10 to 50% by volume of coal particles in water. The main advantages obtained by the method according to the invention are that, on the one hand the pressure losses and thus the energy consumption during the pipeline transport are relatively small, and that on the other hand the separation of the coal particles from the water by mechanical means is not too difficult and not too expensive. Generally, it can be said that, during slurry pipeline transport the pressure losses and thus the energy consumption are lowest when the coal particles in the slurry have a small particle size, but not smaller than 10 Ftm. However, the separation of the coal particles from the water by mechanical means at the end of the pipeline is easiest when the particle size of the coal particles is relatively large. In the method according to the invention use is made of a coal/water slurry wherein the particle size distribution of the coal particles is so selected that optimum conditions are obtained both in relation to energy consumption during pipeline transport and in relation to ease of separation of the coal particles from the water by mechanical means at the end of the pipeline. The desired particle size distribution can be obtained by a combined operation of grinding and classifying of coal. Also unwanted oversized or undersized particles could be removed from the mill output. The oversized particles could be further ground while the undersized particles could be used as a fuel. The fraction of unwanted undersized particles that cannot be used for the above application could be discarded or could be agglomerated to particles largerthan 44 cam. More in particular, by grinding and classifying of coal, a coal product can be obtained comprising at least 95% by weight of coal particles having a particle size smaller than 700 Itm and at most 10% by weight of coal particles having a particle size smaller than 44 Ftm. If desired, it is possible to carry out the said grinding and classifying operation in such a way that the above-mentioned value of 700 Ftm is replaced by 300 Ftm and/or said value of 10% is replaced by 5%. The coal product obtained is mixed with a certain quantity of water, so as to produce a coal/water slurry containing 10 to 50% by volume of coal particles in water. This slurry is transported through a pipeline and at the end of the pipeline the coal particles are separated from the water by mechanical al means, for example by means of a centrifuge or by means of suitable sieves. The diagram according to the figure shows some possible particle size distributions of the coal. Along the lower horizontal axis of the diagram Tyler Standard Screens (TSS) are indicated in Mesh and along the upper horizontal axis of the diagram Sieve Openings (SO) are indicated in ym. Along the vertical axis of the diagram coal particles retained on the screens are indicated in % by weight (Wr). The curve I indicates a first possible particle size distribution of coal particles to be used in a coal/ water slurry according to the invention. Curves Il-IIA respectively Il-IIB indicate respectively second and third particle size distributions of coal particles to be used in the slurry according to the invention. CLAIMS
1. A method of transporting coal as a coal/water slurry through a pipeline, wherein the coal in the slurry comprises at least 95% by weight of coal particles having a particle size smaller than 700 Ftm and at most 10% by weight of coal particles having a particle size smaller than 44 ptm.
2. The method as claimed in claim 1, wherein the coal in the slurry comprises at least 95% by weight of coal particles having particle size smaller than 300 Ftm.
3. The method as claimed in any one of the claims 1 to 2, wherein the coal in the slurry comprises at most 5% by weight of coal particles having a particle size smaller than 44 Ftm.
4. The method as claimed in any one of the claims 1 to 3, wherein the coal/water slurry contains 10 to 50% by volume of coal particles in water.
5. A method of producing a coal/water slurry for use in the methods as claimed in claim 1, comprising grinding and clasifying coal so as to obtain a coal product comprising at least 95% by weight of coal particles having a particle size smaller than 700 ,etm and at most 10% by weight of coal particles having a particle size smaller than 44 Ftm and mixing the coal product with water.
6. The method as claimed in claim 5, comprising grinding and classifying coal so as to obtain a coal product comprising at least 95% by weight of coal particles having a particle size smaller than 300 Mm.
7. The method as claimed in any one of the claims 5 to 6, comprising grinding and classifying coal so as to obtain a coal product comprising at most 5% by weight of coal particles having a particle size smaller than 44 um.
8. The method as claimed in any one of the claims 5 to 7, wherein the coal product obtained is mixed with such a quantity of water that coal/water slurry is obtained containing 10 to 50% by volume of coal particles in water.
9. A coal/water slurry produced by means of the method as claimed in any one of the claims 5 to 8, wherein the coal in the slurry comprises at least 95% by weight of coal particles having a particle size smaller than 700 ,etm and at most 10% by weight of coal particles having a particle size smaller than 44 ytm.
10. A method oftransporting coal as a coal/water slurry through a pipeline as claimed in claim 1 and substantially as hereinbefore described.
11. A method of producing a coal/water slurry as claimed in claim 5 and substantially as hereinbefore described.
12. A coal/water slurry as claimed in claim 9 and substantially as hereinbefore described.
GB8002009A 1980-01-22 1980-01-22 A method of transporting coal as a coal/water slurry through a pipeline Withdrawn GB2068056A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB8002009A GB2068056A (en) 1980-01-22 1980-01-22 A method of transporting coal as a coal/water slurry through a pipeline

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB8002009A GB2068056A (en) 1980-01-22 1980-01-22 A method of transporting coal as a coal/water slurry through a pipeline

Publications (1)

Publication Number Publication Date
GB2068056A true GB2068056A (en) 1981-08-05

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GB8002009A Withdrawn GB2068056A (en) 1980-01-22 1980-01-22 A method of transporting coal as a coal/water slurry through a pipeline

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GB (1) GB2068056A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4525173A (en) * 1982-05-19 1985-06-25 The British Petroleum Company P.L.C. Mineral slurries
AU571255B2 (en) * 1983-08-19 1988-04-14 British Petroleum Company Plc, The Mineral slurries

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4525173A (en) * 1982-05-19 1985-06-25 The British Petroleum Company P.L.C. Mineral slurries
AU571255B2 (en) * 1983-08-19 1988-04-14 British Petroleum Company Plc, The Mineral slurries

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