EP0739653A1 - Verbesserung zur Beseitigung des Explosionsrisikos in einer Zerkleinerungsanlage - Google Patents

Verbesserung zur Beseitigung des Explosionsrisikos in einer Zerkleinerungsanlage Download PDF

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Publication number
EP0739653A1
EP0739653A1 EP95400936A EP95400936A EP0739653A1 EP 0739653 A1 EP0739653 A1 EP 0739653A1 EP 95400936 A EP95400936 A EP 95400936A EP 95400936 A EP95400936 A EP 95400936A EP 0739653 A1 EP0739653 A1 EP 0739653A1
Authority
EP
European Patent Office
Prior art keywords
water
atmosphere
installation
improvement
air
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.)
Withdrawn
Application number
EP95400936A
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English (en)
French (fr)
Inventor
René Bertho
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.)
FRANCAISE DES FERRAILLES Cie
Original Assignee
FRANCAISE DES FERRAILLES Cie
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 FRANCAISE DES FERRAILLES Cie filed Critical FRANCAISE DES FERRAILLES Cie
Priority to EP95400936A priority Critical patent/EP0739653A1/de
Publication of EP0739653A1 publication Critical patent/EP0739653A1/de
Withdrawn legal-status Critical Current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
    • 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
    • B02C23/20—Adding fluid, other than for crushing or disintegrating by fluid energy after crushing or disintegrating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C13/00—Disintegrating by mills having rotary beater elements ; Hammer mills
    • B02C13/26—Details
    • B02C13/31—Safety devices or measures
    • 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
    • B02C23/04—Safety devices

Definitions

  • the present invention relates to an improvement intended to eliminate the risks of explosions in grinding installations.
  • the force generated by a detonation is unstoppable, the rubber hatches not acting given the speed of the flame.
  • the Applicant has sought, for its part, not simply to combat the risk of primary explosion but to provide a solution to the problems of so-called secondary explosions in grinding installations.
  • the proposed solution has the advantage of being particularly simple in its implementation.
  • the invention relates to an improvement intended to eliminate the risks of dust explosions in grinding installations consisting in creating an atmosphere containing 70 to 100% of water relative to the saturation throughout the direct suction area of the air containing pulverulent materials, located downstream of the mill.
  • the water content in said atmosphere will be greater than 90% and preferably between 90 and 95%.
  • the humid atmosphere produced in the downstream part of the mill is in the form of a mist consisting of fine water droplets and obtained in particular by atomization or vaporization of water in said atmosphere.
  • the quantity of water to be injected into the atmosphere of the downstream part of the mill where the pulverulent particles ground to the desired size are found is chosen so as to achieve the desired degree of humidity in this atmosphere, while remaining at a humidity level below the dew point at room temperature in this atmosphere.
  • This amount of water is advantageously chosen from the range between 10 and 40 g of water per m3 of air.
  • the invention relates to the use of the improvement described above to avoid the risks of dust explosions in any installation implementing a process comprising a step of grinding non-putrescible materials.
  • the grinding stage is generally followed by various subsequent stages of separation of the ground material.
  • Such steps include in particular steps for sorting the ground material, depending on the nature and / or the particle size of the ground products.
  • the invention relates to installations implementing the improvement of the invention.
  • These installations include in particular means for spraying water at the outlet of the mill and means for controlling the relative humidity prevailing in the direct air suction circuit at the outlet of the mill, for the purpose of regulating from said rate to the desired value.
  • FIG. 1 schematically represents an installation for grinding and separating the ground particles according to their nature and their particle size.
  • Figure 2 shows in more detail an essential part of the grinding installation constituted by the grinder.
  • FIG. 3 represents a so-called MOLLIER diagram making it possible to relate the weight of water vapor contained in 1 m 3 of air to the percentage of relative humidity with respect to air saturation as a function of temperature.
  • Figure 1 there is shown schematically a grinding line and separation of the ground particles, more particularly suitable for the grinding of automobile wrecks.
  • Figure 2 shows in more detail the mill of the installation shown in Figure 1.
  • the grinding line consists of the conventional elements of a grinding installation and there are simply added to it the elements making it possible to impose and regulate the humidity rate. wanted in the part of the installation conventionally the most subject to the risks of secondary explosions.
  • FIGS. 1 and 2 further comprises, and this is what creates the originality of the invention, means making it possible to introduce water in the form of fine droplets at the outlet of the mill so as to create an atmosphere containing the desired degree of humidity throughout the circuit 2 for direct air suction at the outlet of the mill. It further comprises means for regulating and controlling this humidity level.
  • these means consist of devices 13 for injecting steam under high pressure at the outlet of the mill 1.
  • These devices 13 advantageously consist of nozzles intended to inject the desired quantity of water produced by a water booster pump (not shown), so as to create in the circuit 2 a kind of mist.
  • the number of nozzles used and the flow rate of each are determined according to the quantity of water to be injected.
  • control of the humidity level in circuit 2 is advantageously done by indirectly controlling the humidity level of the air. rejected by the entire installation by placing a humidity probe 14 on the exhaust circuit of the entire installation.
  • the air flows are conventionally controlled throughout the installation and regulated by means of the fan 15.
  • the percentage of relative humidity given by the humidity probe 14 can therefore be directly linked to the humidity level in the evacuation circuit where this gauge is located. Knowing the air flow rates in this zone as well as in circuit 2 will allow easy access to the determination of the relative humidity level in circuit 2.
  • controlling the humidity level by means of the humidity gauge 14 will make it possible to know the humidity level in circuit 2.
  • This rate can then be controlled and regulated by adjusting the flow rate of the nozzles which will advantageously be equipped with solenoid valves 16 so as to be able to control from the mill cabin the operation of the booster group producing water as a function of the hygrometric degree and the temperature.
  • the method according to the invention not only considerably reduces the risks of secondary explosions due to the presence of moisture in the form of a mist which promotes the cohesion of the dust, their agglomeration as well as the reduction of static electricity. and increases their heat absorption capacity. Furthermore, controlling the humidity level at values remaining below 100% with respect to saturation makes it possible to avoid the known drawbacks of excess water.
  • the process of the invention also makes it possible, as we have seen previously, to reduce the discharge of dust into the atmosphere, which in certain cases simplifies the installations.

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  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Disintegrating Or Milling (AREA)
EP95400936A 1995-04-26 1995-04-26 Verbesserung zur Beseitigung des Explosionsrisikos in einer Zerkleinerungsanlage Withdrawn EP0739653A1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP95400936A EP0739653A1 (de) 1995-04-26 1995-04-26 Verbesserung zur Beseitigung des Explosionsrisikos in einer Zerkleinerungsanlage

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP95400936A EP0739653A1 (de) 1995-04-26 1995-04-26 Verbesserung zur Beseitigung des Explosionsrisikos in einer Zerkleinerungsanlage

Publications (1)

Publication Number Publication Date
EP0739653A1 true EP0739653A1 (de) 1996-10-30

Family

ID=8221484

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95400936A Withdrawn EP0739653A1 (de) 1995-04-26 1995-04-26 Verbesserung zur Beseitigung des Explosionsrisikos in einer Zerkleinerungsanlage

Country Status (1)

Country Link
EP (1) EP0739653A1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2230019A3 (de) * 2009-03-21 2014-10-15 Ventilatorenfabrik Oelde Gmbh Verfahren zum Zerkleinern von grobem Schrott oder schrottähnlichen Materialien sowie Vorrichtung zur Durchführung des Verfahrens

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB657621A (en) * 1948-01-22 1951-09-26 Agicide Lab Inc Process for grinding and classifying organic materials
US3603514A (en) * 1969-07-28 1971-09-07 Williams Patent Crusher & Pulv Scrap reducing and refining apparatus
US4378851A (en) * 1980-09-08 1983-04-05 Quad Environmental Technologies Corporation Method for inhibiting explosions
US4712741A (en) * 1984-03-14 1987-12-15 Kabushiki Kaisha Takuma Explosion preventive rotation crusher
JPH06226136A (ja) * 1992-12-04 1994-08-16 N K K Plant Kensetsu Kk 回転破砕機の防爆装置
JPH06226137A (ja) * 1992-12-04 1994-08-16 N K K Plant Kensetsu Kk 回転破砕機の防爆装置

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB657621A (en) * 1948-01-22 1951-09-26 Agicide Lab Inc Process for grinding and classifying organic materials
US3603514A (en) * 1969-07-28 1971-09-07 Williams Patent Crusher & Pulv Scrap reducing and refining apparatus
US4378851A (en) * 1980-09-08 1983-04-05 Quad Environmental Technologies Corporation Method for inhibiting explosions
US4712741A (en) * 1984-03-14 1987-12-15 Kabushiki Kaisha Takuma Explosion preventive rotation crusher
JPH06226136A (ja) * 1992-12-04 1994-08-16 N K K Plant Kensetsu Kk 回転破砕機の防爆装置
JPH06226137A (ja) * 1992-12-04 1994-08-16 N K K Plant Kensetsu Kk 回転破砕機の防爆装置

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 018, no. 601 (C - 1274) 16 November 1994 (1994-11-16) *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2230019A3 (de) * 2009-03-21 2014-10-15 Ventilatorenfabrik Oelde Gmbh Verfahren zum Zerkleinern von grobem Schrott oder schrottähnlichen Materialien sowie Vorrichtung zur Durchführung des Verfahrens

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