EP0408327B1 - Fuel briquettes - Google Patents

Fuel briquettes Download PDF

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Publication number
EP0408327B1
EP0408327B1 EP19900307561 EP90307561A EP0408327B1 EP 0408327 B1 EP0408327 B1 EP 0408327B1 EP 19900307561 EP19900307561 EP 19900307561 EP 90307561 A EP90307561 A EP 90307561A EP 0408327 B1 EP0408327 B1 EP 0408327B1
Authority
EP
European Patent Office
Prior art keywords
briquette
fuel
molasses
coal
briquette according
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.)
Expired - Lifetime
Application number
EP19900307561
Other languages
German (de)
French (fr)
Other versions
EP0408327A1 (en
Inventor
Duncan Taylor
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.)
RYAN INTERNATIONAL Ltd
Original Assignee
RYAN INTERNATIONAL Ltd
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
Application filed by RYAN INTERNATIONAL Ltd filed Critical RYAN INTERNATIONAL Ltd
Publication of EP0408327A1 publication Critical patent/EP0408327A1/en
Application granted granted Critical
Publication of EP0408327B1 publication Critical patent/EP0408327B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • C10L5/00—Solid fuels
    • C10L5/02—Solid fuels such as briquettes consisting mainly of carbonaceous materials of mineral or non-mineral origin
    • C10L5/06—Methods of shaping, e.g. pelletizing or briquetting
    • C10L5/10—Methods of shaping, e.g. pelletizing or briquetting with the aid of binders, e.g. pretreated binders

Definitions

  • the present invention is concerned with fuel briquettes and, in particular, briquettes made from carbonaceous fuel particles, such as powdered fine coal.
  • Coal briquettes are conventionally formed by bonding coal particles using an organic binder; many such binders have been proposed, including molasses, which is known for use in a low temperature briquetting process.
  • molasses which is known for use in a low temperature briquetting process.
  • Various inorganic hardening agents have been proposed for the molasses binder, such as lime (GB 2181449), phosphoric acid (GB 230306), calcium phosphate, ferric oxide, calcium carbonate and/or aluminium oxide (GB 2187754), and plaster of Paris (FR-A-326 283).
  • the present invention relates to a fuel briquette comprising carbonaceous fuel particles bonded together by means of a binder comprising molasses in an amount of at least 2% by weight, based on the weight of the briquette, and an inorganic hardening agent for the molasses, the hardening material being present in a minor (hardening) amount, relative to the weight of the molasses.
  • the hardening agent is present in an amount of 0.02 to 5% by weight, based on the weight of the briquette and comprises an alkali metal phosphate together with phosphoric acid and/or sulphuric acid.
  • the alkali metal phosphate is preferably pentasodium triphosphate (sodium orthophosphate).
  • the molasses is preferably present in an amount of 2 to 20% by weight (such as 5 to 15%) based on the weight of the briquette.
  • the phosphoric acid is present in an amount not exceeding 2% by weight of the briquette.
  • the binder should be substantially free of synthetic polymer binders; the molasses used as the binder may be cane or beet molasses.
  • the carbonaceous fuel used in the briquettes according to the present invention may be charcoal, coke, or coal.
  • the preferred fuel is a high rank non-caking coal, typically of the low smoke type, such as anthracite.
  • the fuel generally has a particle size below 3mm; anthracite duff is particularly preferred.
  • Other coals which may be used are steam coals. and heat-treated coals.
  • the briquettes according to the invention may be formed as agglomerates by extrusion, ring roll or roll pressing, die pressing, rotary table pressing or pelletising.
  • the green briquettes may be allowed to harden, for example, at room temperature over one to three days, or cured at elevated temperature (e.g. at 200 to 300°C for up to one hour). This hot curing may be carried out in an over containing an inert or partially inert atmosphere.
  • Anthracite dust was dried, crushed and screened to approximately 3mm, and then mixed with 8% molasses, 1% phosphoric acid and 0.3% sodium orthophosphate. The mixture was then forced into briquettes and cured at 260°C for one hour in an oxygen-controlled atmosphere.
  • the resulting briquettes were substantially non-friable and had satisfactory water-resistance.
  • Example 1 was repeated, except that 0.2% of sodium orthophosphate was used. Similar results were obtained.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Geology (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Organic Chemistry (AREA)
  • Solid Fuels And Fuel-Associated Substances (AREA)

Description

  • The present invention is concerned with fuel briquettes and, in particular, briquettes made from carbonaceous fuel particles, such as powdered fine coal.
  • Coal briquettes are conventionally formed by bonding coal particles using an organic binder; many such binders have been proposed, including molasses, which is known for use in a low temperature briquetting process. Various inorganic hardening agents have been proposed for the molasses binder, such as lime (GB 2181449), phosphoric acid (GB 230306), calcium phosphate, ferric oxide, calcium carbonate and/or aluminium oxide (GB 2187754), and plaster of Paris (FR-A-326 283).
  • We have now devised alternative inorganic hardening agents for a molasses-based binder for use in making fuel briquettes.
  • Broadly, the present invention relates to a fuel briquette comprising carbonaceous fuel particles bonded together by means of a binder comprising molasses in an amount of at least 2% by weight, based on the weight of the briquette, and an inorganic hardening agent for the molasses, the hardening material being present in a minor (hardening) amount, relative to the weight of the molasses. According to the present invention the hardening agent is present in an amount of 0.02 to 5% by weight, based on the weight of the briquette and comprises an alkali metal phosphate together with phosphoric acid and/or sulphuric acid.
  • The alkali metal phosphate is preferably pentasodium triphosphate (sodium orthophosphate).
  • The molasses is preferably present in an amount of 2 to 20% by weight (such as 5 to 15%) based on the weight of the briquette. Typically the phosphoric acid is present in an amount not exceeding 2% by weight of the briquette.
  • It is preferred that the binder should be substantially free of synthetic polymer binders; the molasses used as the binder may be cane or beet molasses.
  • The carbonaceous fuel used in the briquettes according to the present invention may be charcoal, coke, or coal. The preferred fuel is a high rank non-caking coal, typically of the low smoke type, such as anthracite. The fuel generally has a particle size below 3mm; anthracite duff is particularly preferred. Other coals which may be used are steam coals. and heat-treated coals.
  • The briquettes according to the invention may be formed as agglomerates by extrusion, ring roll or roll pressing, die pressing, rotary table pressing or pelletising.
  • The green briquettes may be allowed to harden, for example, at room temperature over one to three days, or cured at elevated temperature (e.g. at 200 to 300°C for up to one hour). This hot curing may be carried out in an over containing an inert or partially inert atmosphere.
  • In order that the present invention may be more fully understood, the following Examples (in which all percentages are by weight) are given by way of illustration only.
    • Example 1
  • Anthracite dust was dried, crushed and screened to approximately 3mm, and then mixed with 8% molasses, 1% phosphoric acid and 0.3% sodium orthophosphate. The mixture was then forced into briquettes and cured at 260°C for one hour in an oxygen-controlled atmosphere.
  • The resulting briquettes were substantially non-friable and had satisfactory water-resistance.
    • Example 2
  • Example 1 was repeated, except that 0.2% of sodium orthophosphate was used. Similar results were obtained.

Claims (8)

  1. A fuel briquette comprising carbonaceous fuel particles bonded together by means of a binder comprising molasses in an amount of at least 2% and an inorganic hardening agent for the molasses in an amount of 0.02 to 5%, both percentages being based on the weight of the briquette, characterised in that the hardening agent comprises an alkali metal phosphate together with phosphoric acid and/or sulphuric acid.
  2. A briquette according to claim 1, wherein the molasses is present in an amount of 2 to 20% based on the weight of the briquette.
  3. A briquette according to claim 1 or 2, which is substantially free of synthetic polymer binders.
  4. A briquette according to any of claims 1 to 3, in which the carbonaceous fuel comprises charcoal, coke or coal.
  5. A briquette according to claim 4, in which the coal is a high rank, low-smoke non-caking coal.
  6. A briquette according to claim 5 wherein said coal is anthracite.
  7. A briquette according to any of claims 1 to 6, in which the fuel has a particle size below 3mm.
  8. A fuel briquette according to any of claims 1 to 7, which is formed by extrusion, ring roll or roll pressing, die pressing, rotary table pressing or pelletising.
EP19900307561 1989-07-11 1990-07-09 Fuel briquettes Expired - Lifetime EP0408327B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB898915866A GB8915866D0 (en) 1989-07-11 1989-07-11 Fuel briquettes
GB8915866 1989-07-11

Publications (2)

Publication Number Publication Date
EP0408327A1 EP0408327A1 (en) 1991-01-16
EP0408327B1 true EP0408327B1 (en) 1993-09-29

Family

ID=10659866

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19900307561 Expired - Lifetime EP0408327B1 (en) 1989-07-11 1990-07-09 Fuel briquettes

Country Status (3)

Country Link
EP (1) EP0408327B1 (en)
DE (1) DE69003612T2 (en)
GB (1) GB8915866D0 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19916271C2 (en) * 1999-04-12 2002-10-17 Schwarze Pumpe Energiewerke Ag Process for the production of heat-resistant pellets for gasification
DE29910271U1 (en) * 1999-06-15 2000-10-26 Poetzsch Jens Active ingredient component for the cosmetic area
RU2495092C1 (en) * 2012-05-18 2013-10-10 Айтбер Махачевич Бижанов Extrusion-type fuel briquette (brex)

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR326283A (en) * 1902-11-11 1903-05-21 Simons Joseph Improvements in the manufacture of charcoal briquettes
GB222449A (en) * 1923-09-28 1925-05-14 Henri Du Boistesselin Process for agglomerating coal dust and other powdered fuels
GB230306A (en) * 1924-05-05 1925-03-12 Theodore Nagel Improvements in or relating to briquettes and the process of producing the same
GB2181449B (en) * 1985-10-05 1989-05-04 Bobrite Limited Fuel briquettes
GB8606332D0 (en) * 1986-03-14 1986-04-23 Coal Industry Patents Ltd Coal briquetting process

Also Published As

Publication number Publication date
GB8915866D0 (en) 1989-08-31
EP0408327A1 (en) 1991-01-16
DE69003612D1 (en) 1993-11-04
DE69003612T2 (en) 1994-02-17

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