EP0457635A1 - Combustible agglomerates containing granular carbonaceous combustible material and a binder and process for its manufacture - Google Patents
Combustible agglomerates containing granular carbonaceous combustible material and a binder and process for its manufacture Download PDFInfo
- Publication number
- EP0457635A1 EP0457635A1 EP91401118A EP91401118A EP0457635A1 EP 0457635 A1 EP0457635 A1 EP 0457635A1 EP 91401118 A EP91401118 A EP 91401118A EP 91401118 A EP91401118 A EP 91401118A EP 0457635 A1 EP0457635 A1 EP 0457635A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- agglomerate
- lignite coke
- binder
- starch
- weight
- 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.)
- Ceased
Links
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
- C10L5/14—Methods of shaping, e.g. pelletizing or briquetting with the aid of binders, e.g. pretreated binders with organic binders
Definitions
- the present invention relates to combustible agglomerates comprising a granular solid carbonaceous combustible material and a binder; it also relates to a process for manufacturing such agglomerates.
- Solid carbonaceous combustible materials are currently used in the most diverse fields and in particular in many industrial processes, in particular the processes of steel making or recarburization of steels and cast irons, where they serve as a source of energy. , reducing material and / or carburizing agent.
- the Applicant has therefore sought to bring this lignite coke in a denser, non-pulverulent form capable of being introduced into the converters in order to easily penetrate the mass of molten metal by simple gravity. It therefore carried out an in-depth study with a view to producing agglomerates from lignite coke and a binder, these agglomerates having to have sufficient mechanical strength to allow their handling under relatively severe conditions.
- an agglomerate, of the briquette, ball or pellet type having the desired properties and comprising a granular solid carbonaceous combustible material and a binder, in which said combustible material the aforementioned lignite coke and said binder is constituted by starch within which are distributed anthracite fines acting as reinforcing filler of the matrix formed by the starch.
- the lignite coke will preferably be chosen to have a grain size not greater than 5 mm, the anthracite fines for their part, preferably a particle size of the order of 0.5 to 4 mm.
- the proportion by weight of lignite coke, starch and anthracite fines within the agglomerate according to the invention is advantageously respectively from 60 to 90% (preferably 65-80%), 5 to 10% and 5 to 30% (preferably 10 to 25%), a particularly preferred composition being as follows: lignite coke 72% by weight, anthracite fines 20% by weight, starch 8% by weight.
- the starch used according to the invention can be chosen from starches of all kinds and in particular from native starches, for example corn or wheat starches, and native starches made soluble in water by a cooking treatment. extrusion.
- the water used in this process is advantageously used partially in the form of liquid and partially in the form of superheated steam, for example at a temperature of 150 to 200 ° C, especially 185 ° C, the relative proportions of the liquid water and steam being chosen so that the mixture to be kneaded is at the temperature of 100-110 ° C.
- the treatment of the dough uses conventional agglomeration techniques widely described in the literature; this may include, in particular, briquetting, extrusion and pressure compaction techniques.
- drying it advantageously consists in subjecting the agglomerate to a baking, preferably in an oven with circulation of hot air at 110-130 ° C.
- the agglomerate according to the invention has very good cohesion, its mechanical resistance to compression possibly reaching values of the order of 150.105Pa.
- the resulting dough is extracted at the base of the latter and brought into a compacting device of the roller press type having cavities imprinting the shape desired to agglomerates.
- the agglomerates thus obtained are then deposited on a metal mat passing through a hot air circulation oven at 110-130 ° C, the speed of advancement of this mat being chosen so that the residence time of said agglomerates inside the oven for at least 2 hours.
- the resulting dried agglomerates have a bulk density of the order of 0.7 and a compressive strength, measured using a compressometer of the SAHUT CONREUR type, of the order of 150.105Pa.
Abstract
Description
La présente invention concerne des agglomérés combustibles comprenant une matière combustible carbonée solide granulaire et un liant ; elle concerne également un procédé de fabrication de tels agglomérés.The present invention relates to combustible agglomerates comprising a granular solid carbonaceous combustible material and a binder; it also relates to a process for manufacturing such agglomerates.
Les matières combustibles carbonées solides sont à ce jour utilisées dans les domaines les plus divers et notamment dans de nombreux procédés industriels, en particulier les procédés d'élaboration des aciers ou de recarburation des aciers et des fontes, où elles servent de source d'énergie, de matière réductrice et/ou d'agent de carburation.Solid carbonaceous combustible materials are currently used in the most diverse fields and in particular in many industrial processes, in particular the processes of steel making or recarburization of steels and cast irons, where they serve as a source of energy. , reducing material and / or carburizing agent.
Dans le cas de ces procédés métallurgiques, utilisation est actuellement faite, à titre de matière combustible, de coke de lignite granulaire généralement obtenu par broyage du lignite, suivi de sa cokéfaction, ce coke de lignite se caractérisant par une grande friabilité, une structure granulaire, une densité en vrac de l'ordre de 0,5 et une très grande surface spécifique pouvant atteindre 300 m²/g.In the case of these metallurgical processes, use is currently made, as combustible material, of granular lignite coke generally obtained by grinding the lignite, followed by its coking, this lignite coke being characterized by high friability, a granular structure , a bulk density of the order of 0.5 and a very large specific surface of up to 300 m² / g.
Toutefois, la mise en oeuvre du coke de lignite dans les procédés métallurgiques ci-dessus présente certains inconvénients. Ainsi par exemple, l'introduction de ce coke dans les convertisseurs par des goulottes latérales est malaisé, car en raison de sa faible densité, il est difficile de le faire pénétrer dans la masse de métal fondu. En outre, en raison de son état pulvérulent, une partie de ce coke est perdue par suite de son inflammation à l'entrée du convertisseur. De plus, et toujours en raison de son état pulvérulent, son transport, sa manutention et son stockage sont délicats.However, the use of lignite coke in the above metallurgical processes has certain drawbacks. Thus, for example, the introduction of this coke into the converters by lateral chutes is difficult, because due to its low density, it is difficult to make it penetrate into the mass of molten metal. In addition, due to its pulverulent state, part of this coke is lost due to its ignition at the inlet of the converter. In addition, and still due to its pulverulent state, its transport, handling and storage are delicate.
La Demanderesse a donc cherché à amener ce coke de lignite sous une forme plus dense, non pulvérulente et susceptible d'être introduite dans les convertisseurs pour y pénétrer aisément la masse de métal fondu par simple gravité. Elle a donc procédé à une étude approfondie en vue de réaliser des agglomérés à partir du coke de lignite et d'un liant, ces agglomérés devant posséder une résistance mécanique suffisante pour permettre leur manutention dans des conditions relativement sévères.The Applicant has therefore sought to bring this lignite coke in a denser, non-pulverulent form capable of being introduced into the converters in order to easily penetrate the mass of molten metal by simple gravity. It therefore carried out an in-depth study with a view to producing agglomerates from lignite coke and a binder, these agglomerates having to have sufficient mechanical strength to allow their handling under relatively severe conditions.
Ces études ayant montré que l'utilisation d'un liant constitué uniquement par de l'amidon conduisait à des agglomérés peu satisfaisants du point de vue de leur résistance mécanique, la Demanderesse a cherché à associer l'amidon avec une charge de renforcement, une telle charge devant remplir quatre conditions, à savoir présenter une résistance mécanique propre élevée, faire preuve d'une grande force d'adhérence vis-à-vis de l'amidon, être compatible avec le coke de lignite dont la très grande surface spécifique en fait un produit tout à fait particulier et, de préférence, être elle-même combustible pour limiter la formation de cendres.These studies having shown that the use of a binder consisting solely of starch leads to agglomerates which are unsatisfactory from the point of view of their mechanical strength, the Applicant has sought to associate the starch with a reinforcing filler, a such a filler having to fulfill four conditions, namely to present a high own mechanical resistance, to demonstrate a great adhesion strength with respect to starch, to be compatible with lignite coke whose very large specific surface in makes a very special product and preferably be itself combustible to limit the formation of ash.
Elle a ainsi abouti, selon l'invention, à la mise au point d'un aggloméré, du type briquette, boulet ou pellet, ayant les propriétés souhaitées et comprenant une matière combustible carbonée solide granulaire et un liant, dans lequel ladite matière combustible comprend le coke de lignite susmentionné et ledit liant est constitué par de l'amidon au sein duquel sont réparties des fines d'anthracite agissant en tant que charge de renforcement de la matrice formée par l'amidon.It has thus resulted, according to the invention, in the development of an agglomerate, of the briquette, ball or pellet type, having the desired properties and comprising a granular solid carbonaceous combustible material and a binder, in which said combustible material the aforementioned lignite coke and said binder is constituted by starch within which are distributed anthracite fines acting as reinforcing filler of the matrix formed by the starch.
Dans cet aggloméré, le coke de lignite sera de préférence choisi pour présenter une dimension de grain non supérieure à 5 mm, les fines d'anthracite présentant pour leur part, de préférence une dimension de particule de l'ordre de 0,5 à 4 mm.In this agglomerate, the lignite coke will preferably be chosen to have a grain size not greater than 5 mm, the anthracite fines for their part, preferably a particle size of the order of 0.5 to 4 mm.
Par ailleurs, la proportion en poids de coke de lignite, d'amidon et de fines d'anthracite au sein de l'aggloméré selon l'invention est avantageusement respectivement de 60 à 90 % (de préférence 65-80 %), 5 à 10 % et 5 à 30 % (de préférence 10 à 25 %), une composition particulièrement préférée étant comme suit : coke de lignite 72 % en poids, fines d'anthracite 20 % en poids, amidon 8 % en poids.Furthermore, the proportion by weight of lignite coke, starch and anthracite fines within the agglomerate according to the invention is advantageously respectively from 60 to 90% (preferably 65-80%), 5 to 10% and 5 to 30% (preferably 10 to 25%), a particularly preferred composition being as follows: lignite coke 72% by weight, anthracite fines 20% by weight, starch 8% by weight.
L'amidon mis en oeuvre selon l'invention peut être choisi parmi les amidons de toute nature et notamment parmi les amidons natifs, par exemple de maïs ou de blé, et les amidons natifs rendus solubles dans l'eau par un traitement de cuisson-extrusion.The starch used according to the invention can be chosen from starches of all kinds and in particular from native starches, for example corn or wheat starches, and native starches made soluble in water by a cooking treatment. extrusion.
Le procédé selon l'invention pour la fabrication, en continu ou discontinu, de l'aggloméré décrit ci-dessus, se caractérise en ce qu'il comprend :
- le malaxage, de préférence à une température de 100 à 110° C, de quantités appropriées de coke de lignite, de fines d'anthracite et d'amidon, avec de l'eau utilisée en une quantité de poids de 15 à 40 %, de préférence de 15 à 35 %, de la somme des poids du coke de lignite et des fines d'anthracite,
- le traitement de la pâte résultante pour l'amener sous la forme d'aggloméré, et
- le séchage de l'aggloméré obtenu.
- kneading, preferably at a temperature of 100 to 110 ° C, of appropriate quantities of lignite coke, anthracite fines and starch, with water used in an amount of weight of 15 to 40%, preferably from 15 to 35%, of the sum of the weights of lignite coke and anthracite fines,
- treating the resulting pulp to bring it into the form of agglomerate, and
- drying of the agglomerate obtained.
L'eau utilisée dans ce procédé est avantageusement mise en oeuvre partiellement sous la forme de liquide et partiellement sous la forme de vapeur surchauffée, par exemple à une température de 150 à 200° C, notamment 185° C, les proportions relatives de l'eau liquide et de la vapeur d'eau étant choisies de manière à ce que le mélange à malaxer soit à la température de 100-110° C.The water used in this process is advantageously used partially in the form of liquid and partially in the form of superheated steam, for example at a temperature of 150 to 200 ° C, especially 185 ° C, the relative proportions of the liquid water and steam being chosen so that the mixture to be kneaded is at the temperature of 100-110 ° C.
Le traitement de la pâte, pour l'amener sous la forme d'aggloméré, fait appel à des techniques classiques d'agglomération largement décrites dans la littérature ; il pourra s'agir notamment des techniques de briquetage, d'extrusion et de compactage par pression.The treatment of the dough, to bring it into the form of agglomerate, uses conventional agglomeration techniques widely described in the literature; this may include, in particular, briquetting, extrusion and pressure compaction techniques.
Quant au séchage, il consiste avantageusement à soumettre l'aggloméré à un étuvage, de préférence dans un four à circulation d'air chaud à 110-130° C.As for drying, it advantageously consists in subjecting the agglomerate to a baking, preferably in an oven with circulation of hot air at 110-130 ° C.
L'aggloméré selon l'invention présente une très bonne cohésion, sa résistance mécanique à la compression pouvant atteindre des valeurs de l'ordre de 150.10⁵Pa.The agglomerate according to the invention has very good cohesion, its mechanical resistance to compression possibly reaching values of the order of 150.10⁵Pa.
Pour illustrer l'invention, on donne ci-après un exemple, non limitatif, de fabrication de l'aggloméré selon l'invention.To illustrate the invention, a non-limiting example of the manufacture of the agglomerate according to the invention is given below.
Dans un malaxeur comprenant des bras horizontaux solidaires d'un arbre vertical tournant à 11 tours/mn, on introduit, d'une part 72 kg de coke de lignite, 20 kg de fines d'anthracite et 8 kg d'amidon natif de blé et, d'autre part 20 kg d'eau chaude à une température proche de 100° C. Par ailleurs, de la vapeur d'eau surchauffée à 185° C est introduite dans le malaxeur par des buses réparties sur toute la hauteur de sa paroi latérale, la quantité de vapeur injectée par ces buses étant choisie de manière à ce que le mélange malaxé ait une température de l'ordre de 100-110° C.72 kg of lignite coke, 20 kg of anthracite fines and 8 kg of native wheat starch are introduced into a mixer comprising horizontal arms secured to a vertical shaft rotating at 11 rpm. and, on the other hand 20 kg of hot water at a temperature close to 100 ° C. Furthermore, steam superheated to 185 ° C is introduced into the mixer by nozzles distributed over the entire height of its side wall, the quantity of steam injected by these nozzles being chosen so that the kneaded mixture has a temperature of the order of 100-110 ° C.
Après de préférence une durée de séjour d'au moins 3 mn 30 s dudit mélange dans le malaxeur, la pâte résultante est extraite à la base de ce dernier et amenée dans un dispositif de compactage du type presse à rouleaux présentant des cavités imprimant la forme désirée aux agglomérés.After preferably a residence time of at least 3 min 30 s of the said mixture in the mixer, the resulting dough is extracted at the base of the latter and brought into a compacting device of the roller press type having cavities imprinting the shape desired to agglomerates.
Les agglomérés ainsi obtenus sont ensuite déposés sur un tapis métallique traversant un four à circulation d'air chaud à 110-130° C, la vitesse d'avancement de ce tapis étant choisie pour que le temps de séjour desdits agglomérés à l'intérieur du four soit d'au moins 2 heures.The agglomerates thus obtained are then deposited on a metal mat passing through a hot air circulation oven at 110-130 ° C, the speed of advancement of this mat being chosen so that the residence time of said agglomerates inside the oven for at least 2 hours.
Les agglomérés séchés résultants présentent une densité en vrac de l'ordre de 0,7 et une résistance à la compression, mesurée au moyen d'un compressiomètre du type SAHUT CONREUR, de l'ordre de 150.10⁵Pa.The resulting dried agglomerates have a bulk density of the order of 0.7 and a compressive strength, measured using a compressometer of the SAHUT CONREUR type, of the order of 150.10⁵Pa.
Claims (10)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR9006129A FR2662172B1 (en) | 1990-05-16 | 1990-05-16 | COMBUSTIBLE AGGLOMERATES COMPRISING A GRANULAR CARBON FUEL MATERIAL AND A BINDER AND THEIR MANUFACTURING METHOD. |
| FR9006129 | 1990-05-16 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP0457635A1 true EP0457635A1 (en) | 1991-11-21 |
Family
ID=9396676
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP91401118A Ceased EP0457635A1 (en) | 1990-05-16 | 1991-04-26 | Combustible agglomerates containing granular carbonaceous combustible material and a binder and process for its manufacture |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP0457635A1 (en) |
| FR (1) | FR2662172B1 (en) |
| IE (1) | IE911640A1 (en) |
| NO (1) | NO911891L (en) |
| RU (1) | RU2016048C1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19961325C2 (en) * | 1999-12-18 | 2001-11-15 | Rheinische Braunkohlenw Ag | Barbecue briquette for preparing food on an embers and process for its production |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100206500B1 (en) * | 1995-12-29 | 1999-07-01 | 이구택 | Method of block coke for iron melting furnace |
| AT505227B1 (en) * | 2007-05-09 | 2012-07-15 | Siemens Vai Metals Tech Gmbh | PROCESS FOR THE MANUFACTURE OF FORMINGS |
| AU2013245608A1 (en) * | 2012-04-10 | 2014-09-25 | Primetals Technologies Austria GmbH | Process and apparatus for briquette production |
| RU2501845C1 (en) * | 2012-05-18 | 2013-12-20 | Открытое акционерное общество "Новолипецкий металлургический комбинат" | Extruded coke briquette (brec) |
| RU2655175C1 (en) * | 2018-03-14 | 2018-05-24 | Акционерное общество "Сибирская Угольная Энергетическая Компания" | Method of obtaining metallurgical briquette |
| RU2747049C1 (en) * | 2020-10-01 | 2021-04-23 | Общество с ограниченной ответственностью «Сибнииуглеобогащение» | Method for producing smokeless household fuel |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR855725A (en) * | 1939-02-03 | 1940-05-18 | Fuel briquette and process for its manufacture | |
| GB946358A (en) * | 1960-09-09 | 1964-01-15 | Husky Oil Company | Barbecue briquettes and method of making the same |
| FR2317225A1 (en) * | 1975-06-23 | 1977-02-04 | Siap Soc Ind Agglom Petrol | PROCESS FOR MANUFACTURING GRAPHITE-BASED AGGLOMERS |
-
1990
- 1990-05-16 FR FR9006129A patent/FR2662172B1/en not_active Expired - Fee Related
-
1991
- 1991-04-26 EP EP91401118A patent/EP0457635A1/en not_active Ceased
- 1991-05-13 IE IE164091A patent/IE911640A1/en unknown
- 1991-05-15 RU SU914895304A patent/RU2016048C1/en active
- 1991-05-15 NO NO91911891A patent/NO911891L/en unknown
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR855725A (en) * | 1939-02-03 | 1940-05-18 | Fuel briquette and process for its manufacture | |
| GB946358A (en) * | 1960-09-09 | 1964-01-15 | Husky Oil Company | Barbecue briquettes and method of making the same |
| FR2317225A1 (en) * | 1975-06-23 | 1977-02-04 | Siap Soc Ind Agglom Petrol | PROCESS FOR MANUFACTURING GRAPHITE-BASED AGGLOMERS |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19961325C2 (en) * | 1999-12-18 | 2001-11-15 | Rheinische Braunkohlenw Ag | Barbecue briquette for preparing food on an embers and process for its production |
Also Published As
| Publication number | Publication date |
|---|---|
| IE911640A1 (en) | 1991-11-20 |
| NO911891D0 (en) | 1991-05-15 |
| RU2016048C1 (en) | 1994-07-15 |
| FR2662172B1 (en) | 1992-09-04 |
| NO911891L (en) | 1991-11-18 |
| FR2662172A1 (en) | 1991-11-22 |
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