EP0234017A1 - Drehrohrmühle für die Herstellung eines pulverförmigen Materials in zwei unterschiedlichen Qualitäten - Google Patents

Drehrohrmühle für die Herstellung eines pulverförmigen Materials in zwei unterschiedlichen Qualitäten Download PDF

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Publication number
EP0234017A1
EP0234017A1 EP86117104A EP86117104A EP0234017A1 EP 0234017 A1 EP0234017 A1 EP 0234017A1 EP 86117104 A EP86117104 A EP 86117104A EP 86117104 A EP86117104 A EP 86117104A EP 0234017 A1 EP0234017 A1 EP 0234017A1
Authority
EP
European Patent Office
Prior art keywords
fineness
separator
mill
drying gas
pulverizer
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
EP86117104A
Other languages
English (en)
French (fr)
Other versions
EP0234017B1 (de
Inventor
Daniel Fontanille
Pierre Theilmann
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.)
Stein Industrie SA
Original Assignee
Stein Industrie SA
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 Stein Industrie SA filed Critical Stein Industrie SA
Priority to AT86117104T priority Critical patent/ATE49515T1/de
Publication of EP0234017A1 publication Critical patent/EP0234017A1/de
Application granted granted Critical
Publication of EP0234017B1 publication Critical patent/EP0234017B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C17/00—Disintegrating by tumbling mills, i.e. mills having a container charged with the material to be disintegrated with or without special disintegrating members such as pebbles or balls
    • B02C17/18—Details
    • B02C17/183—Feeding or discharging devices
    • B02C17/186—Adding fluid, other than for crushing by fluid energy
    • B02C17/1875—Adding fluid, other than for crushing by fluid energy passing gas through crushing zone
    • B02C17/189—Adding fluid, other than for crushing by fluid energy passing gas through crushing zone with return of oversize material to crushing zone
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C17/00—Disintegrating by tumbling mills, i.e. mills having a container charged with the material to be disintegrated with or without special disintegrating members such as pebbles or balls
    • B02C17/04—Disintegrating by tumbling mills, i.e. mills having a container charged with the material to be disintegrated with or without special disintegrating members such as pebbles or balls with unperforated container
    • B02C17/06—Disintegrating by tumbling mills, i.e. mills having a container charged with the material to be disintegrated with or without special disintegrating members such as pebbles or balls with unperforated container with several compartments
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
    • B02C23/18—Adding fluid, other than for crushing or disintegrating by fluid energy
    • B02C23/38—Adding fluid, other than for crushing or disintegrating by fluid energy in apparatus having multiple crushing or disintegrating zones

Definitions

  • the present invention relates to a rotary cylindrical grinder with a horizontal axis for the preparation of a pulverulent material with two different degrees of fineness, with members for introducing the material and a drying gas, then for discharging the pulverized material into the drying gas through its trunnions, separated by a transverse partition into two parts isolated from one another, each comprising its members for introducing and discharging the material and the drying gas by the adjoining trunnion.
  • Such grinders are used in particular for the preparation of pulverized coal ensuring the supply of boiler burners. They are of horizontal axis and rotate around it. They are generally loaded with balls or other grinding elements made of hard material which pulverize by crushing and crushing the material to be ground. In some cases, with materials other than coal, the grinding is carried out by attrition of the fragments of the material to be ground against each other.
  • a hot gas generally air
  • air is introduced into the grinder at the same time as the material to be ground, which ensures its drying during grinding, then pneumatic transport. sprayed material.
  • the material to be ground and the drying and transport gas are generally introduced into the mill by two hollow end pins.
  • the ground material emerges from these pins, which include partitions and screw systems for transporting the material to be ground.
  • the ground material suspended in the drying gas the grain size of which is quite wide, most often passes through a separator which lets the fine grains pass to use, and recycles the coarse grains with the raw material for a new passage in the mill.
  • Document GA-A-2007112 describes a mill divided into two sections, each fed by a different hopper, and in which the ground materials removed from the corresponding sections by entrainment in hot drying air are combined in a common separator to be sent for use with a uniform degree of fineness.
  • the object of the present invention is to provide a rotary cylindrical grinder which makes it possible to obtain these two different degrees of fineness.
  • the mill according to the invention is characterized in that the evacuation of each of its parts is connected to a separator of the ground grains according to their fineness, provided with a recycling conduit, and in that the separator connected to the part of the grinder ensuring the greatest fineness of grinding comprises a duct for evacuating the coarsest grains towards the supply duct of the part of the grinder ensuring a finest grinding fineness.
  • the part of the crusher intended to produce the pulverized material of the highest degree of fineness is advantageously connected to a source of hot air under a higher pressure than that of the air source supplying the part of the crusher intended to produce the material sprayed with a lower degree of finesse.
  • coal ball mill for feeding the burners of a boiler from two coals of different origins, the pilot burners being supplied with finely pulverized charcoal and the normal heating burners with pulverized charcoal less finely and richer in ash.
  • the rotary ball mill 1 with a horizontal axis comprises a partition 2 separating it into a left grinding chamber G and a right grinding chamber D.
  • the pins 3 of the crusher are arranged to ensure - the support and the rotation of the crusher (the latter using a motor not shown). - the supply of raw coal through line 3A, a space annular and a screw 4, the entry of the air for drying and transporting the pulverized coal arriving via line 5, through a central pipe 5A, - the outlet of the ground coal through the annular space and the evacuation duct 6.
  • the separator 7 on the left side corresponds to the production of the finest pulverized coal.
  • the expansion in the envelope cone 7A of the separator first causes the separation of the very large grains which are guided by the wall towards the transfer duct 8 towards the right side of the mill.
  • the grains of medium size fall into the inner cone 9 of the separator and are directed towards the recycling conduit 9A towards the left side of the mill.
  • the fine grains are entrained by the transport air towards use by the conduit 10.
  • the separator 11 on the right side corresponds to the production of a common fineness of the pulverized coal. It does not have a discriminating member between very large grains and medium grains, which are guided together by the wall towards the conduit 12 for recycling to the crusher, where they join the conduit 15 for supplying coal on the right side. of the crusher.
  • the pulverized coal of medium fineness is evacuated via line 13 towards use.
  • Each part of the mill has independent operation. Each of them is connected to a reserve of raw coal and to a supply device. Only the device 14 for feeding the right part (with hopper and endless belt) has been shown. This device opens into the feed pipe 15 of the mill, connected to the pipes 8 and 12 already mentioned. Thus, all of the refusal from the right separator 11 is returned to the raw coal supplying the right side of the mill, with the very large grains coming from the refusal from the left separator 7. Only the medium grains from the left separator are returned with the raw coal to the left side of the grinder.
  • An additional advantage of the arrangement described above is that it makes it possible to return part of the hard and ashy grains feed coal on the left side of the mill, intended to provide the best quality of pulverized coal, towards the right side, corresponding to a lower quality of pulverized coal.
  • This is explained by the following example.
  • There are two different grades of charcoal, the characteristics of which and the degree of fineness to be obtained for the pulverized product are indicated in the following table:
  • the left separator refuses 40 t / h that by a mechanical arrangement we share in 30 t / h joining the raw coal of the same origin and 10 t / h joining the coal on the right side crude from another origin. These 10% are very concentrated in ashes and inert, which can be estimated at 30%, which amounts to saying that we extract 3 t / h of ash from the production of 40 t / h of pulverized coal on the left side with a supply of flow rate of 50 t / h.
  • the right side thus produces 80 t / h with 34.5 t / h of ash, or 43%, and the fixed carbon goes from 25% to 26%.
  • the separation of the circuits, to the nearest duct 8, shows that it is possible to separately adjust the flow rates of transport and drying air, their temperature and their pressure.
  • the pressure must however be in the left side, greater than or equal to that on the right side, so that the air current which will be established in the duct 8 promotes the flow of the refusals from left to right.
  • the part of the crusher intended to produce the coarsest particle size material may not include balls or other grinding elements, that intended to produce the most fixed particle size material, on the other hand comprising these balls or grinding elements.
  • the separators may not be gravity separators, but of a different kind, for example with a screen.
  • the crusher according to the invention is more particularly suitable for grinding coal or a solid fossil fuel, it also applies to the grinding of other materials, in particular ores.

Landscapes

  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Crushing And Grinding (AREA)
  • Disintegrating Or Milling (AREA)
  • Combined Means For Separation Of Solids (AREA)
  • Crushing And Pulverization Processes (AREA)
  • Saccharide Compounds (AREA)
EP86117104A 1985-12-11 1986-12-09 Drehrohrmühle für die Herstellung eines pulverförmigen Materials in zwei unterschiedlichen Qualitäten Expired - Lifetime EP0234017B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT86117104T ATE49515T1 (de) 1985-12-11 1986-12-09 Drehrohrmuehle fuer die herstellung eines pulverfoermigen materials in zwei unterschiedlichen qualitaeten.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8518328A FR2591127B1 (fr) 1985-12-11 1985-12-11 Broyeur cylindrique rotatif pour la preparation d'un materiau pulverulent en deux qualites differentes.
FR8518328 1985-12-11

Publications (2)

Publication Number Publication Date
EP0234017A1 true EP0234017A1 (de) 1987-09-02
EP0234017B1 EP0234017B1 (de) 1990-01-17

Family

ID=9325669

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86117104A Expired - Lifetime EP0234017B1 (de) 1985-12-11 1986-12-09 Drehrohrmühle für die Herstellung eines pulverförmigen Materials in zwei unterschiedlichen Qualitäten

Country Status (6)

Country Link
EP (1) EP0234017B1 (de)
JP (1) JPS62191051A (de)
AT (1) ATE49515T1 (de)
DE (1) DE3668272D1 (de)
FR (1) FR2591127B1 (de)
IN (1) IN169769B (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1991014133A1 (fr) * 1990-03-06 1991-09-19 Stein Industrie Procede et systeme de broyage et de sechage pour un combustible solide
FR2793168A1 (fr) * 1999-05-07 2000-11-10 Alstom Broyeur a boulets
CN109937718A (zh) * 2019-03-28 2019-06-28 广州贤智科技有限公司 一种具有烘干功能的高效型秸秆粉碎机
CN114308285A (zh) * 2021-12-28 2022-04-12 河北德尚瓷业有限公司 一种带有出料装置的陶瓷球磨机

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4124416A1 (de) * 1991-07-23 1993-01-28 Krupp Polysius Ag Einrichtung und verfahren zur zerkleinerung von mahlgut unterschiedlicher koernung
FR2745731B1 (fr) * 1996-03-08 1998-04-17 Gec Alsthom Stein Ind Broyeur a boulets
CN102247912A (zh) * 2011-01-10 2011-11-23 朱海良 球磨机组自动卸料系统
WO2016196456A1 (en) * 2015-06-01 2016-12-08 Flsmidth A/S Vertical roller mill

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1257591A (fr) * 1960-05-27 1961-03-31 Nikex Nehezipari Kulkere Broyeur ou moulin à circulation et à grand rendement avec compartiments séparés
GB2007112A (en) * 1977-10-03 1979-05-16 Foster Wheeler Energy Corp Pulverizer arrangement

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2928939A1 (de) * 1979-07-18 1981-02-12 Kloeckner Humboldt Deutz Ag Muehle

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1257591A (fr) * 1960-05-27 1961-03-31 Nikex Nehezipari Kulkere Broyeur ou moulin à circulation et à grand rendement avec compartiments séparés
GB2007112A (en) * 1977-10-03 1979-05-16 Foster Wheeler Energy Corp Pulverizer arrangement

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1991014133A1 (fr) * 1990-03-06 1991-09-19 Stein Industrie Procede et systeme de broyage et de sechage pour un combustible solide
FR2793168A1 (fr) * 1999-05-07 2000-11-10 Alstom Broyeur a boulets
WO2000067910A1 (fr) * 1999-05-07 2000-11-16 Alstom Broyeur a boulets
AU756235B2 (en) * 1999-05-07 2003-01-09 Alstom Ball mill
US6547171B1 (en) 1999-05-07 2003-04-15 Alstom Pulverizing installation
CN109937718A (zh) * 2019-03-28 2019-06-28 广州贤智科技有限公司 一种具有烘干功能的高效型秸秆粉碎机
CN109937718B (zh) * 2019-03-28 2020-10-23 潍坊希普生物科技有限公司 一种具有烘干功能的高效型秸秆粉碎机
CN114308285A (zh) * 2021-12-28 2022-04-12 河北德尚瓷业有限公司 一种带有出料装置的陶瓷球磨机

Also Published As

Publication number Publication date
EP0234017B1 (de) 1990-01-17
ATE49515T1 (de) 1990-02-15
FR2591127B1 (fr) 1989-10-06
JPH0119940B2 (de) 1989-04-13
FR2591127A1 (fr) 1987-06-12
DE3668272D1 (de) 1990-02-22
IN169769B (de) 1991-12-21
JPS62191051A (ja) 1987-08-21

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