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WO2024189525A1 - Procédé de prétraitement de fines de charbon avant granulation - Google Patents

Procédé de prétraitement de fines de charbon avant granulation Download PDF

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Publication number
WO2024189525A1
WO2024189525A1 PCT/IB2024/052360 IB2024052360W WO2024189525A1 WO 2024189525 A1 WO2024189525 A1 WO 2024189525A1 IB 2024052360 W IB2024052360 W IB 2024052360W WO 2024189525 A1 WO2024189525 A1 WO 2024189525A1
Authority
WO
WIPO (PCT)
Prior art keywords
coal fines
coal
feed
mixer
particle size
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.)
Pending
Application number
PCT/IB2024/052360
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English (en)
Inventor
Johannes Gerhardus COETZEE
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.)
Viljoen Johan Hendrik
Original Assignee
Viljoen Johan Hendrik
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 Viljoen Johan Hendrik filed Critical Viljoen Johan Hendrik
Priority to AU2024237847A priority Critical patent/AU2024237847A1/en
Publication of WO2024189525A1 publication Critical patent/WO2024189525A1/fr
Anticipated expiration legal-status Critical
Pending 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 OR C10K; LIQUIFIED PETROLEUM GAS; USE OF ADDITIVES TO FUELS OR FIRES; FIRE-LIGHTERS
    • C10L5/00—Solid fuels
    • C10L5/02—Solid fuels such as briquettes consisting mainly of carbonaceous materials of mineral or non-mineral origin
    • C10L5/34—Other details of the shaped fuels, e.g. briquettes
    • C10L5/36—Shape
    • C10L5/363—Pellets or granulates
    • 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
    • C10L5/00—Solid fuels
    • C10L5/02—Solid fuels such as briquettes consisting mainly of carbonaceous materials of mineral or non-mineral origin
    • C10L5/04—Raw material of mineral origin to be used; Pretreatment thereof
    • 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
    • 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
    • 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
    • C10L5/00—Solid fuels
    • C10L5/02—Solid fuels such as briquettes consisting mainly of carbonaceous materials of mineral or non-mineral origin
    • C10L5/34—Other details of the shaped fuels, e.g. briquettes
    • C10L5/36—Shape
    • 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
    • C10L2250/00—Structural features of fuel components or fuel compositions, either in solid, liquid or gaseous state
    • C10L2250/06—Particle, bubble or droplet size
    • 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
    • C10L2290/00—Fuel preparation or upgrading, processes or apparatus therefore, comprising specific process steps or apparatus units
    • C10L2290/14—Injection, e.g. in a reactor or a fuel stream during fuel production
    • 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
    • C10L2290/00—Fuel preparation or upgrading, processes or apparatus therefore, comprising specific process steps or apparatus units
    • C10L2290/14—Injection, e.g. in a reactor or a fuel stream during fuel production
    • C10L2290/146—Injection, e.g. in a reactor or a fuel stream during fuel production of 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 OR C10K; LIQUIFIED PETROLEUM GAS; USE OF ADDITIVES TO FUELS OR FIRES; FIRE-LIGHTERS
    • C10L2290/00—Fuel preparation or upgrading, processes or apparatus therefore, comprising specific process steps or apparatus units
    • C10L2290/24—Mixing, stirring of fuel components
    • 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
    • C10L2290/00—Fuel preparation or upgrading, processes or apparatus therefore, comprising specific process steps or apparatus units
    • C10L2290/28—Cutting, disintegrating, shredding or grinding
    • 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
    • C10L2290/00—Fuel preparation or upgrading, processes or apparatus therefore, comprising specific process steps or apparatus units
    • C10L2290/30—Pressing, compressing or compacting

Definitions

  • This invention relates in general to the field of pelletizing of coal fines and, in particular, to a novel process for pre-treating coal fines before they are pelletized to improve homogeneity and cohesion of formed coal pellets with a view to increasing mechanical durability and combustion characteristics of such pellets.
  • Coal a combustible, sedimentary rock
  • coal is still the backbone of the world’s energy grid, providing the electricity needed to turn on lights, heat homes, and cook meals.
  • coal fines are an unavoidable by-product of coal mining, processing, and handling. Fine coal is generally classified as a material having a particle size of between 0.15mm and 1 mm. After handling and cleaning, roughly 15% to 20% of mined coal material consists of fines, which can range from powder to small granules.
  • coal fines cannot be used directly for combustion, and are often dumped in hazardous coal slurries, causing expensive and environmentally challenging disposal problems.
  • Coal fines present all sorts of problems, not only during processing, but throughout transport as well.
  • coal fines or coal dust constitute a health hazard when breathed in, are capable of spontaneous combustion, result in significant product losses due to dust being carried away, and can form problematic build-up in mechanical components.
  • Coal fines handling, storage, and disposal operations represent a significant and unproductive expense for the coal industry.
  • coal fines may provide significant advantages to the coal industry, often in the form of low ash and low nitrogen contents, high reactivity and lower mining costs.
  • both the problems of moisture content and fines handling must be addressed.
  • the current emphasis in finding useful applications for coal fines is their utilization in combination with binders to produce coal pellets especially for the stoker coal markets, but also as a more convenient method of shipping to electric power plants for subsequent on-site pulverization and combustion.
  • Coal pellets are created through agglomeration of coal fines by tumbling moist coal fines in drums or discs to produce round coal pellets. More particularly, coal fines are typically fed into a pelletising machine, such as a pin mixer, along with water and/or a binder, where they are conditioned into granules. Once granule formation begins, coal granules are generally fed onto a disc pelletizer, where they are further grown and rounded into more refined coal pellets. From the pelletizer, they are fed to a rotary dryer, where they are dried into a final product.
  • a pelletising machine such as a pin mixer
  • a binder Once granule formation begins, coal granules are generally fed onto a disc pelletizer, where they are further grown and rounded into more refined coal pellets. From the pelletizer, they are fed to a rotary dryer, where they are dried into a final product.
  • binders are disclosed in the prior art to assist with agglomeration of coal fines
  • the goal is to produce pellets that have a pellet size of approximately 3mm to 50mm, that will allow sufficient air flow to be optimally combustible, but that exhibit sufficient mechanical durability to withstand transportation, handling, and fluctuating weather conditions. It is herein that lies the problem: even though pelletizing addresses fines handling problems in principle, coal pellets themselves often do not remain in stable, agglomerated form during transport and downstream handling, or in the presence of high atmospheric moisture or rain, instead breaking apart and reverting to coal fines of various sizes. Coal is a hydrophobic material, meaning that it is not attracted to water.
  • coal fines are not wetted properly, it cannot efficiently bind in the presence of a binder, resulting in unstable coal pellets that disintegrate during transport and handling, which problem is exacerbated in the presence of atmospheric moisture.
  • Feeding binder into a pelletizing machine together with a moist coal fines feed causes caking and clumping on the machine walls, which further reduces proper admixing and binding of the coal fines particles with the binder.
  • a process which is suitable for, although not limited to, pre-treating coal fines before pelletising to improve homogeneity and cohesion of formed coal pellets, wherein the process provides the steps of - mechanically reducing particle size of coal fines in a feed stream to less than
  • pellet should be interpreted to include briquette, log and block and is intended to refer to all forms of pellets, briquettes, logs, blocks and other coal agglomerates produced by binding coal fines into a binder material.
  • pelletizing is intended to refer to equivalent processes for producing coal agglomerates.
  • the particle size of the coal fines in the feed stream may preferably be reduced mechanically to less than 1 mm before being wetted.
  • the particle size may be reduced to less than 1 mm through high-speed rotation, preferably at between 250rpm and 800rpm, in a first mixer, while it is being wetted with water.
  • the coal fines feed may be wetted with water to a moisture content of preferably 20%.
  • the first mixer may be a pug mill mixer, blade mixer or paddle mixer, which is conventionally operated at 60rpm, but which the applicants operate at between 250rpm and 800rpm to achieve the high-speed agitation of the coal fines feed to reduce particle size mechanically.
  • the wetted coal fines feed may be introduced into a second mixer where it is further reduced through high-speed rotation, preferably at between 250rpm and 800rpm, to a particle size of less than 300pm.
  • the coal fines may be reduced in the second mixer to a particle size of less than 100pm.
  • the second mixer may be a pug mill mixer, blade mixer or paddle mixer, which is conventionally operated at 60rpm, but which the applicants operate at between 250rpm and 800rpm to achieve the high-speed agitation of the coal fines feed to reduce particle size.
  • the coal fines may be reduced in the second mixer to a particle size of less 100pm, while it is being admixed with a binder, under high-speed rotation conditions, preferably at between 250rpm and 800rpm.
  • the wetted and binder-admixed coal fines feed may preferably have a particle size of less than 100pm when it is introduced into a pelletizing machine.
  • the invention includes a wetted and binder-admixed coal fines feed produced according to the process of the invention.
  • the invention further includes pellets produced from a wetted and binder-admixed coal fines feed produced according to the process of the invention.
  • the process commences with feeding coal fines of varying particle sizes from a feeding hopper [10] to a particle screen [12], where larger particles are separated out.
  • the remaining coal fines are then conveyed through one or a number of sizing machines [14], as is known in the prior art.
  • the process of the invention essentially provides three process steps for pre-treating such coal fines, namely mechanically reducing particle size of the coal fines to increase coal particle surface area; wetting the reduced coal particles through high-speed rotation of the particles in the presence of water; and binding the wetted particles with a binder through high- speed rotation of the particles in the presence of the binder, before introducing the pre-treated coal fines feed into a pelletizing machine.
  • the invention provides introducing the coal fines feed into a first mixer [16] together with water, where the particle size of the coal fines is mechanically reduced to less than 3mm, but preferably less than 1 mm. This is done through highspeed rotation, typically at between 250rpm and 800rpm, of the coal fines feed in the presence of the water, to achieve high-speed surface wetting of the coal particles while they are being reduced in size. It is important to note that the moisture content of the coal fines in the first mixer [16] is measured to ensure that the wetted coal fines feed in the first mixer [16] has a moisture content of 15% - 25%. In order to determine how much water needs to be introduced into the first mixer [16], the moisture content of the coal fines feed is measured at [24] before the coal fines feed is introduced into the first mixer [16].
  • the wetted coal fines feed is then introduced into a second mixer [18] where the wetted coal fines feed is admixed with a binder to a total feed volume concentration of 3% - 7%.
  • the prior art provides various binders that are suited to this process step. This is done through high-speed rotation, typically at between 250rpm and 800rpm, of the coal fines feed in the presence of the binder, to achieve high-speed coating and binding of the wetted coal particles with the binder while the coal particles are further being reduced in size.
  • the wetted and binder-coated coal particles have a particle size of less than 100pm by the time they are introduced into a pelletizing machine.
  • coal fines feed can be wetted and admixed with the binder in a single mixer by increasing retention time of the coal fines feed in the mixer.
  • coal fines feed is then introduced into a pelletising machine [20] for pellet formation, heated and dried [22] and separated into pellet sizes, as provided for in the prior art.

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)

Abstract

L'invention concerne un procédé de prétraitement de fines de charbon avant granulation en vue d'améliorer l'homogénéité et la cohésion des granulés de charbon formés. L'invention concerne essentiellement trois étapes de traitement pour le prétraitement de telles fines de charbon, à savoir la réduction mécanique de la granulométrie des fines de charbon à moins de 3 mm afin d'augmenter la surface des particules de charbon ; le mouillage des particules de charbon réduites par rotation à grande vitesse des particules en présence d'eau ; et la liaison des particules mouillées à l'aide d'un liant par rotation à grande vitesse des particules en présence du liant en une concentration volumique de 3 % à 7 % tout en réduisant davantage mécaniquement la granulométrie des fines de charbon à moins de 300 µm ; avant l'introduction de la charge de fines de charbon prétraitées dans une machine de granulation.
PCT/IB2024/052360 2023-03-13 2024-03-12 Procédé de prétraitement de fines de charbon avant granulation Pending WO2024189525A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2024237847A AU2024237847A1 (en) 2023-03-13 2024-03-12 Process for pre-treating coal fines before pellitising

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ZA202303507 2023-03-13
ZA2023/03507 2023-03-13

Publications (1)

Publication Number Publication Date
WO2024189525A1 true WO2024189525A1 (fr) 2024-09-19

Family

ID=92754458

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2024/052360 Pending WO2024189525A1 (fr) 2023-03-13 2024-03-12 Procédé de prétraitement de fines de charbon avant granulation

Country Status (2)

Country Link
AU (1) AU2024237847A1 (fr)
WO (1) WO2024189525A1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4455148A (en) * 1981-04-09 1984-06-19 Mitsui Engineering & Shipbuilding Co., Ltd. Method for de-ashing and transportation of coal
US5242470A (en) * 1991-08-09 1993-09-07 Zeigler Coal Holding Company Pelletizing coal or coke with starch particles
US6284017B1 (en) * 1996-11-11 2001-09-04 Sumitomo Metal Industries, Ltd. Method and facility for producing reduced iron
US20120285082A1 (en) * 2010-01-01 2012-11-15 Mcgoldrick Fredrick Pellets and Processes Therefor
US20220228081A1 (en) * 2021-01-21 2022-07-21 Carbon Technology Holdings, LLC Processes for producing biocarbon pellets with adjustable grindability index

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4455148A (en) * 1981-04-09 1984-06-19 Mitsui Engineering & Shipbuilding Co., Ltd. Method for de-ashing and transportation of coal
US5242470A (en) * 1991-08-09 1993-09-07 Zeigler Coal Holding Company Pelletizing coal or coke with starch particles
US6284017B1 (en) * 1996-11-11 2001-09-04 Sumitomo Metal Industries, Ltd. Method and facility for producing reduced iron
US20120285082A1 (en) * 2010-01-01 2012-11-15 Mcgoldrick Fredrick Pellets and Processes Therefor
US20220228081A1 (en) * 2021-01-21 2022-07-21 Carbon Technology Holdings, LLC Processes for producing biocarbon pellets with adjustable grindability index

Also Published As

Publication number Publication date
AU2024237847A1 (en) 2025-09-18

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