EP0094307A2 - Strahlmühlen - Google Patents

Strahlmühlen Download PDF

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Publication number
EP0094307A2
EP0094307A2 EP83400913A EP83400913A EP0094307A2 EP 0094307 A2 EP0094307 A2 EP 0094307A2 EP 83400913 A EP83400913 A EP 83400913A EP 83400913 A EP83400913 A EP 83400913A EP 0094307 A2 EP0094307 A2 EP 0094307A2
Authority
EP
European Patent Office
Prior art keywords
nozzles
supplied
crusher
enclosure
distributor
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
EP83400913A
Other languages
English (en)
French (fr)
Other versions
EP0094307B1 (de
EP0094307A3 (en
Inventor
Simon Serge Verney
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.)
Broyeurs Poittemill Sa Dite
Original Assignee
Broyeurs Poittemill Sa Dite
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 Broyeurs Poittemill Sa Dite filed Critical Broyeurs Poittemill Sa Dite
Priority to AT83400913T priority Critical patent/ATE29972T1/de
Publication of EP0094307A2 publication Critical patent/EP0094307A2/de
Publication of EP0094307A3 publication Critical patent/EP0094307A3/fr
Application granted granted Critical
Publication of EP0094307B1 publication Critical patent/EP0094307B1/de
Expired 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
    • B02C19/00—Other disintegrating devices or methods
    • B02C19/06—Jet mills
    • B02C19/061—Jet mills of the cylindrical type

Definitions

  • the present invention relates to improvements in jet mills in which the granular or pulverulent material is introduced continuously or not in an enclosure around which are arranged several nozzles supplied with pressurized fluid ensuring substantially horizontal centripetal jets within the material. to cause crushing zones by impacts between the grains (attrition) and cause the finest particles to rise, which are then continuously extracted from above, while the larger particles, because they are insufficiently crushed, fall laterally. in the material to be ground. The large particles entrained with the fines are reintroduced into the grinding chamber after classification in the separator.
  • the speed of the particles is generated by a high pressure gas or vapor expelled through nozzles.
  • -Gas or vapor can be inert towards the material to be ground.
  • the material to be ground is introduced laterally into an enclosure around which are arranged nozzles which cause horizontal jets. which rise upward within matter.
  • a version is provided where the nozzles are arranged annularly so as to concentrate their effect in the center of the enclosure.
  • the gas or the vapor are injected continuously and the speed of the jet is generally supersonic.
  • This continuous blowing has the disadvantage of creating zones of low material concentration since this material cannot be reintroduced with a suitable flow rate in the jet, in particular in the initial zone where the speed is the greatest.
  • the particles are permanently animated with a movement with relatively high speeds and, consequently, the accelerations which they undergo are moderate when they fall in the zones of jets where there reign higher speeds.
  • the frequency of shocks is relatively low, which decreases the intensity and efficiency of grinding on the one hand and energy efficiency on the other.
  • the low acceleration decreases the relative shock velocities which also decreases the intensity and efficiency of the grinding.
  • the present invention is intended to remedy these drawbacks.
  • the crusher of the invention is mainly characterized by the fact that the nozzles are distributed at different levels and are supplied by pulses controlled by gas by at least one distributor supplying the different nozzles alternately.
  • a rotary distributor with gradually reducing passage section. This is obtained by modulating the rotation of the distributor, or again by an appropriate passage section of the conduit in the rotary distributor.
  • This section can be in a drop of water, for example, and reduce the flow rate at the end of closing.
  • the nozzles are distributed in several series, each series being supplied by the same ramp external to the enclosure and each ramp receiving its separate, pulsed supply.
  • the nozzles When the nozzles are supplied individually through the distributor, they can be supplied successively in a circular permutation. Said nozzles can also be arranged and supplied so as to act in a helical permutation.
  • the shape of the enclosure is varied. It can be cylindrical, prismatic, conical, pyramidal, barrel-shaped or any other form deemed appropriate. However, in some of these forms, and depending on the distribution of the nozzles, there may be areas where the material is insufficiently agitated. To remedy this, at least one secondary nozzle is supplied continuously.
  • the distributor As for the distributor supplying the different nozzles according to an established program but which can be varied, its operation is then controlled from a microprocessor device which thus manages the supply of the nozzles according to different criteria chosen by an operator .
  • Pulsed blowing allows materials to be reintroduced into the high speed areas of the jet while the blowing stops. Thus, upon resumption of blowing, the material is strongly accelerated; in this way, the blowing takes place every period in an area of high concentration of materials and its efficiency is improved.
  • the distribution of the nozzles and the pulses given to their supply are determined by the material, the initial fineness, the final fineness and the production to be carried out. In any case, it was found that production was improved with a reduction in consumption of energy.
  • the crusher of the invention is located in the center of an installation of which there is a General view in FIG. 7.
  • the grinding chamber (1) which here has the shape of a vertical cylinder but can have any other prismatic, conical, pyramidal or other shape which improves attrition and reduces the speed of the material at the walls .
  • This grinding enclosure is surrounded by two ramps, one of the first level (4) and the other of the second level (5) which surround, like rings, the middle part of the enclosure (1).
  • the ramps (4) and (5) feed nozzles, respectively (2) and (3).
  • Each of the ramps (4) and (5) is fed in turn by the interme- of iaire valves (6) and (7) that control supply all or nothing for each of the ramps (4) and (5 ) and therefore nozzles (2) and (3).
  • the valves (6) and (7) are supplied, according to the arrows (20), (21) by pressurized gas or dry steam.
  • the ground material finely enough inside the grinding chamber (1) rises to the top and ends up in a separator (8) from which the finest particles are sent into a second separator (9) of finished products while the largest particles are returned to the screw conveyor (14) which supplies the grinding chamber (1) by the return pipe ( 1 1) and the lock (12).
  • the gases having conveyed the products are sent from the separator (9) to the filter (10) which returns them to the atmosphere according to the arrow (22).
  • the ground products are collected in (23) and (24).
  • the products to be ground are poured into the feed hopper (13) which is closed by a lock (25) and which opens into the screw conveyor (14) to feed the grinding chamber (1).
  • the conveyor (14) has a sealing device (15) between the hopper (13) and the grinding chamber (1).
  • the sealing device is advantageously constituted by an interruption of the screw inside the conveyor (14).
  • the product to be ground introduced into the grinding chamber (1) by the conveyor (14) falls on a porous bottom (17) under which there is an air chamber (18) to fluidize said product, in particular with a view to evacuating the unmilled material accumulated at the bottom of the enclosure (1) by the combination of the inclination of the bottom (17) with blowing air into said chamber (18). Uncrushed products are discharged through the lock (19). However, to avoid any accumulation of new products introduced by the conveyor (14), an auxiliary nozzle (16) is provided which blows gas continuously without releasing the outlet from the conveyor (14).
  • a line (26) is provided between the top of the enclosure (1) and the top of the hopper (13) to balance the pressures and facilitate feeding.
  • the essential characteristic of the device of the invention resides in the grinding chamber (1) where nozzles (2) and (3) are provided distributed at different levels and where the supply of said nozzles (2) and ( 3), by two separate ramps (4) and (5), is controlled by valves (6) and (7) whose operation depends on a distribution device which determines their alternating pulsating opening. Different variants in the food tation of the various nozzles and their distribution will be explained below.
  • FIG. 5 represents a longitudinal section of nozzles (2) which consist of a convergent of a divergent (28) connected by a neck (29) which is a narrow orifice.
  • nozzles (2) which consist of a convergent of a divergent (28) connected by a neck (29) which is a narrow orifice.
  • a rotary distributor (48) (FIG. 8) is used, the distributor channel (49) of which has a drop-shaped section as shown in FIG. 9.
  • FIG. 1 there is shown a grinding enclosure (1) with nozzles (2) and (3) distributed over two different levels.
  • the nozzles (3) of the upper level are supplied separately by conduits (31), (32), (33) themselves successively supplied by a solenoid valve (34) threaded from an electronic switch with adjustable frequency ( 35) to which it is connected by line (36).
  • the nozzles (2) are supplied in successive pulses by the conduits (37), (38), (39) from a solenoid valve (40) whose operation is controlled by the electronic frequency switch adjustable (35) to which it is connected by the line (41).
  • the compressed supply gas generally air, arrives through the supply pipe (42), which can be isolated by the valve (43) and which supplies the two solenoid valves (34), (40).
  • the electronic adjustable frequency switch (35) is advantageously accompanied by an adjustable calculator (35) is advantageously accompanied by a microprocessor computer which makes it possible to adjust the blowing time of each nozzle and the moment when this blowing will take place. All these times are adjustable so that we can manage at will the operation of each of the nozzles to create the maximum number of turbulence zones and move them at will in order to obtain the greatest possible efficiency in grinding.
  • FIG. 4 there is shown the same grinding chamber (1) with nozzles (3) supplied by a ramp (5) receiving compressed gas through the pipe (44). Also shown are nozzles (201) and (202) which are supplied either by ramps similar to the ramp (5), or individually as has been explained above and illustrated in FIG. 1.
  • solenoid valves similar to the solenoid valves (34), (40) which are controlled by a switch similar to the switch (35).
  • a grinding chamber (1) with its feed screw conveyor (14) and on the walls of which are distributed nozzles (203), (204), (205) and (206) according to verti wedges.
  • the nozzles (203) can be supplied by the same ramp. It is the same for each of the nozzle groups (204), (205) and (206). Each of these ramps is then connected to a solenoid valve which distributes the air in the form of cyclic pulses according to the control of an electronic switch with adjustable frequency.
  • each of the nozzles (203) to (206) can receive a supply by a separate pipe which also leads to a piloted solenoid valve in order to obtain the maximum of adjustment possibilities in the pulsations carried out.
  • nozzles (207) distributed helically at the periphery of the grinding chamber (1).
  • the nozzles (207) can be supplied by one or more helical ramps which receive a supply of pulsed gas.
  • a separate SUPPLY TERMINAL t ation of each of the nozzles (207) by means of a separate pipe which leads to a solenoid répartissan cyclic pulsations of gas following a program established by a adjustable frequency electronic switch.

Landscapes

  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Disintegrating Or Milling (AREA)
  • Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)
EP83400913A 1982-05-12 1983-05-05 Strahlmühlen Expired EP0094307B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT83400913T ATE29972T1 (de) 1982-05-12 1983-05-05 Strahlmuehlen.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8208532 1982-05-12
FR8208532A FR2526679B1 (fr) 1982-05-12 1982-05-12 Perfectionnements aux broyeurs a jets

Publications (3)

Publication Number Publication Date
EP0094307A2 true EP0094307A2 (de) 1983-11-16
EP0094307A3 EP0094307A3 (en) 1985-10-09
EP0094307B1 EP0094307B1 (de) 1987-09-30

Family

ID=9274083

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83400913A Expired EP0094307B1 (de) 1982-05-12 1983-05-05 Strahlmühlen

Country Status (5)

Country Link
EP (1) EP0094307B1 (de)
AT (1) ATE29972T1 (de)
DE (1) DE3373875D1 (de)
ES (1) ES522193A0 (de)
FR (1) FR2526679B1 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4852811A (en) * 1985-08-01 1989-08-01 E.C.C. International Limited Comminution of material
AT400820B (de) * 1988-11-07 1996-03-25 Zementanlagen Und Maschinenbau Fliessbett-gegenstrahlmühle

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104841536A (zh) * 2014-02-18 2015-08-19 昆山市密友装备制造有限责任公司 气流粉碎机用喷嘴进气改良结构

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1935344A (en) * 1931-06-16 1933-11-14 American Pulverizing Corp Camd Impact pulverizer
US1948609A (en) * 1932-01-18 1934-02-27 American Pulverizing Corp Method of pulverizing minerals and similar materials
US2628786A (en) * 1948-08-25 1953-02-17 Celanese Corp Moving-fluid-stream pulverizing apparatus with screened discharge
FR2104091A5 (de) * 1970-08-14 1972-04-14 Alpine Ag

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1935344A (en) * 1931-06-16 1933-11-14 American Pulverizing Corp Camd Impact pulverizer
US1948609A (en) * 1932-01-18 1934-02-27 American Pulverizing Corp Method of pulverizing minerals and similar materials
US2628786A (en) * 1948-08-25 1953-02-17 Celanese Corp Moving-fluid-stream pulverizing apparatus with screened discharge
FR2104091A5 (de) * 1970-08-14 1972-04-14 Alpine Ag

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4852811A (en) * 1985-08-01 1989-08-01 E.C.C. International Limited Comminution of material
AT400820B (de) * 1988-11-07 1996-03-25 Zementanlagen Und Maschinenbau Fliessbett-gegenstrahlmühle

Also Published As

Publication number Publication date
FR2526679B1 (fr) 1988-04-08
DE3373875D1 (en) 1987-11-05
FR2526679A1 (fr) 1983-11-18
EP0094307B1 (de) 1987-09-30
ES8401864A1 (es) 1984-02-01
ES522193A0 (es) 1984-02-01
ATE29972T1 (de) 1987-10-15
EP0094307A3 (en) 1985-10-09

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