EP0300297B1 - Procédé et installation de traitement de produits granulaires utilisés dans le traitement hivernal de chaussées - Google Patents

Procédé et installation de traitement de produits granulaires utilisés dans le traitement hivernal de chaussées Download PDF

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Publication number
EP0300297B1
EP0300297B1 EP88110990A EP88110990A EP0300297B1 EP 0300297 B1 EP0300297 B1 EP 0300297B1 EP 88110990 A EP88110990 A EP 88110990A EP 88110990 A EP88110990 A EP 88110990A EP 0300297 B1 EP0300297 B1 EP 0300297B1
Authority
EP
European Patent Office
Prior art keywords
grit
dryer
air
drying
zone
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.)
Expired - Lifetime
Application number
EP88110990A
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German (de)
English (en)
Other versions
EP0300297A1 (fr
Inventor
Urs Peier
René Gloor
Werner Axt
Heinrich Weber
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.)
REC RECYCLING AG
Carl Schenck AG
Original Assignee
REC RECYCLING AG
Carl Schenck AG
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 REC RECYCLING AG, Carl Schenck AG filed Critical REC RECYCLING AG
Priority to AT88110990T priority Critical patent/ATE67257T1/de
Publication of EP0300297A1 publication Critical patent/EP0300297A1/fr
Application granted granted Critical
Publication of EP0300297B1 publication Critical patent/EP0300297B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01H—STREET CLEANING; CLEANING OF PERMANENT WAYS; CLEANING BEACHES; DISPERSING OR PREVENTING FOG IN GENERAL CLEANING STREET OR RAILWAY FURNITURE OR TUNNEL WALLS
    • E01H10/00—Improving gripping of ice-bound or other slippery traffic surfaces, e.g. using gritting or thawing materials ; Roadside storage of gritting or solid thawing materials; Permanently installed devices for applying gritting or thawing materials; Mobile apparatus specially adapted for treating wintry roads by applying liquid, semi-liquid or granular materials
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
    • B07B9/00—Combinations of apparatus for screening or sifting or for separating solids from solids using gas currents; General arrangement of plant, e.g. flow sheets
    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
    • E01C19/00—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving
    • E01C19/02—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving for preparing the materials
    • E01C19/05—Crushing, pulverising or disintegrating apparatus; Aggregate screening, cleaning, drying or heating apparatus; Dust-collecting arrangements specially adapted therefor

Definitions

  • the invention relates to a method for the preparation of grit used for winter service on walked and driven, at least partially icy and / or snow-covered traffic areas for the protection of people and vehicles against gliding, in particular of grit, which when used is contaminated by foreign materials and melt water and other liquids are moistened, the grit collected after use being cleaned and dehumidified from coarse-grained contaminants by sieving and then from fine-grained contaminants by air separation.
  • a method for separating a composite mixture of different particles is generally known.
  • an oscillating device is used, the mixture being conveyed over a first plateau to the edge of a discharge opening and then being carried upwards by air flow with air.
  • the particles of the mixture describe one corresponding parabolic trajectory and land either on a second plateau, on a corresponding landing area or on the floor pan of a channel.
  • this vibrating device is not suitable for separating dust-like contaminants from a moist grit.
  • US-A 4523988 describes a method for processing the abrasive grain of a blasting sand.
  • coarse impurities are first separated out and then the material is dried and then air sifted by separating dust.
  • the drying takes place in a drying drum, in which the material is rubbed against one another very strongly and is thus crushed to an undesirable extent in the manner of sand. This also means that part of the goods are discharged as abraded dust during the wind sifting.
  • the object of the present invention is to obtain high-quality grit by processing old grit, with as little old grit as possible being lost. Furthermore, the entire preparation process should be quick and inexpensive.
  • a vibrating fluid bed for drying and air separation to separate fine-grained impurities, which has a drying zone and an air separation zone, both zones being exposed to hot air.
  • Drying in a vibrating fluid bed can be carried out much more gently.
  • the material to be dried is only subjected to a micro-throwing motion on a vibrating fluid bed, abrasion of the material being substantially reduced.
  • the heating medium both in the drying zone and in the wind classification zone, directly through the one to be dried Is well conducted, there is an intensive heat exchange, so that the drying is accelerated.
  • the washed and pre-dewatered old chippings still contain 15-20% by weight of water which has to be evaporated in the dryer, while in the process according to the invention with old chippings which are moist in the landfill, this only has a moisture content of between 5-7% by weight. This means a 60-70% reduction in energy consumption when drying.
  • the collected grit is cleaned of coarse-grained contaminants by sieving and fine-grained grit by air sifting, while at the same time as the air sifting, the grit is dehumidified to a final moisture level suitable for use in winter service.
  • the invention also includes a system, the task of which is to be able to carry out the method optimally.
  • This object is achieved according to the invention in that the drying and the air separation for separating the fine-grained contaminants from the scattering material is provided in a vibrating fluid bed, which is preceded by a vibrating sieve for separating the coarse-grained contaminants.
  • the vibrating fluid bed has a drying zone and a separation zone, both zones being exposed to hot air.
  • the vibrating fluid bed can be a control device be assigned, which uses the exhaust air temperature of the separation zone as a reference variable.
  • the arrow 1 shows the transport of the used and collected old chippings, which is delivered to an intermediate landfill 2.
  • the delivery takes place here with transport vehicles or directly from the street sweepers.
  • the old chippings are conveyed from the intermediate landfill 2 into a feed bunker 4 by means of a conveying device 3, for example a charger.
  • a conveying device 3 for example a charger.
  • This is expediently dimensioned such that it can hold approximately a material supply with which the system can be operated for approximately 30-60 minutes.
  • the old chippings are removed from the feed bunker 4 by a suitable, controllable extraction device 5, which is designed, for example, as a vibration conveyor suitable for the bunker extraction.
  • the old chippings are fed to a separator 13 for the separation of coarse-grained impurities in the old chippings by a conveying member 12.
  • This feeding can take place directly or, as shown in FIG. 1, by means of the conveying element 12, for example an inclined conveyor.
  • the old grit usually contains about 5-7% by weight of coarse-grained impurities.
  • the separator 13 has the task of this Eliminate foreign bodies and grit particles with a grain size above the grit size of the spreading material of preferably 8-10 mm from the old grit. Separators 13 in the form of vibrating sieves are particularly suitable for this purpose.
  • the coarse-grained contaminants are supplied by a suitable transport device 15, for example a chute, to a container 23, for example a trough container.
  • the old chippings cleaned of coarse-grained impurities then reach a dryer 16 via a feed chute 14.
  • the dryer 16 has the task of conveying the landfill-moist old chippings with a moisture content of usually 4-7% by weight to a final moisture content of maximum 0.5% by weight dry so that the processed chippings remain free-flowing even at low temperatures.
  • Suitable dryer types can be used for drying bulk goods.
  • dryers designed as vibrating fluid bed dryers are particularly advantageous for this, since the wind sifting can be integrated into the construction of the dryer 16 in order to separate the fine-grained impurities.
  • a vibrating fluid bed dryer is comparatively small in its outer dimensions and can therefore be very easily accommodated even in confined spaces, for example on a vehicle.
  • Vibratory fluid bed dryers differ from stationary fluid bed dryers in that they are set in a directional vibration by a vibration exciter. In this way, the items to be dried are also fluidized by the oscillating movement, in addition to the air flow generated in the dryer, so that even items that are difficult to fluidize, such as moist chippings, can be dried.
  • the dryer 16 is provided with an air separation zone 17 integrated therein, as will be explained in detail with reference to FIG. 2.
  • the wind sifting zone 17 is located at the end of a drying zone 18 designed as a drying section, since it is only here that the fine-grained impurities are released from the grit.
  • the wind sifting zone 17 differs from the drying zone 18 essentially in that the air velocity corresponds to at least 1.5 times the sinking velocity of the largest particles to be removed and the exhaust air duct is designed such that the detached fine-grained impurities are entrained by the air flow into an exhaust air line 19 will. For this reason, the wind classification zone 17 is equipped with its own exhaust air line 19 for the removal of the dust-laden air classifier exhaust air.
  • the drying zone also has its own exhaust air duct 20.
  • the old chippings cleaned in this way contain a maximum of 0.5-2.0% dust-like impurities.
  • the split silo 31 has a removal device 32, via which the grit can be removed for further distribution.
  • the dryer 16 is supplied by a hot gas generator 22 with drying air at a temperature between 200 and 300 ° C.
  • the hot gas generator 22 consists of a combustion chamber 23 ', a total air blower 25, a primary air blower 26, a reservoir 24 and actuators 27, 28 which are required for the operation of the hot gas generator 22.
  • the hot gas generator 22 can be operated with either liquid, gaseous or solid fuels.
  • the dust-laden exhaust air emerging from the wind classification zone 17 and the drying zone 18 of the dryer 16 is conducted via a line 29 into a dedusting system 6.
  • An exhaust air fan 7 is connected on the clean gas side of the dedusting system 6 in order to prevent wear on the fan components or at least to keep them low.
  • the cleaned exhaust air is blown out into the atmosphere through a line 8.
  • the dust separated in the dedusting system 6 is discharged from the dedusting system 6 via a conveying element 9, for example a collecting screw, and introduced into a closed container 10, for example a closed trough container.
  • the dryer 16 has a vibration isolation frame 36, which is supported on spring elements 37 on a fixed bottom surface 39.
  • the machine parts of the wind classification zone 17 and the drying zone 18 form a counterweight to the mass of the vibration isolation frame 36 and are connected to the vibration isolation frame 36 by flexible coupling members 40.
  • a vibration exciter 41 for example with rotating unbalances, is fastened to the vibration isolation frame 36 and is driven by a drive 42.
  • An air chamber 43 for the drying zone 18 and a further air chamber 44 for the air separation zone are formed in the two zones 17, 18 and the vibration isolation frame 36, from which two chambers the air passes through a floor 45 into the drying zone 18 and through a further floor 46 into the Wind classification zone 17 flows.
  • the interim storage of the old chippings 1 in the open landfill 2 has the consequence that the moisture of the same is constantly subject to strong fluctuations during the dismantling from the landfill 2.
  • Special control measures are required to ensure smooth operation.
  • the amounts of chippings that are passed through are controlled by automatic control devices 47, 48, 49. These control devices are connected to the control valves 27, 28 and to the controllable bunker discharge device 5.
  • the regulation of the amount of old chippings implemented has the task of compensating for longer-term fluctuations in the feed moisture, while the regulation of the drying air temperature compensates for the shorter-term fluctuations.
  • the dehumidification of the old chippings is not suitable as a guide variable because it is difficult to measure continuously. However, it has been shown that the exhaust air temperature of the air visibility zone 17 is very well suited as a substitute guide variable.
  • the system described can be used in a transportable version.
  • the system is shown on two vehicles 11, 38, which can be carried out with motor drives or as a trailer or semi-trailer.
  • Another possibility is the arrangement on a so-called swap body.
  • the swap body is easily detachably connected to the chassis, so that the chassis and the system can be removed at the place of use can be operated alone on the swap body. Since the mobile system can also work in the vicinity of residential areas, all system components can be designed with low noise emissions or can be equipped with additional noise protection devices.

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Processing Of Solid Wastes (AREA)
  • Solid-Sorbent Or Filter-Aiding Compositions (AREA)
  • Drying Of Solid Materials (AREA)
  • Fertilizers (AREA)
  • Manufacture And Refinement Of Metals (AREA)

Claims (4)

1. Procédé de traitement de produit d'épandage utilisé pour le service hivernal sur des surfaces empruntées par des piétons et des véhicules, au moins en partie verglacées et/ou recouvertes de neige, pour la protection des personnes et des voitures contre le dérapage, notamment d'abrasif qui, lors de sa mise en oeuvre, est souillé par des matériaux étrangers et rendu humide par l'eau de fonte et d'autres liquides, le produit d'épandage recueilli après sa mise en oeuvre étant débarrassé des impuretés à gros grains par tamisage et séparé ensuite des impuretés à grains fins par séparation à air et asséché, caractérisé en ce que pour le séchage et la séparation à air, il est prévu, en vue de la séparation des impuretés à graine fins, un lit fluidisé qui comporte une zone de séchage (18) et une zone de séparation à air (17), les deux zones étant alimentées en air chaud.
2. Procédé selon la revendication 1, caractérisé en ce que l'épuration du produit d'épandage recueilli est transportable et réalisé en des lieux de mise en oeuvre différents.
3. Installation pour la mise en oeuvre du procédé selon la revendication 1, caractérisée en ce que pour le séchage et la séparation à air, en vue de la séparation des impuretés à grains fins contenues dans le produit d'épandage recueilli, il est prévu un séchoir (16) avec un lit fluidisé dans lequel se succèdent une zone de séchage (18) et une zone de séparation à air (17), un tamis oscillant (13) étant monté en avant du séchoir (16), pour la séparation des impuretés à gros grains contenues dans le produit d'épandage recueilli.
4. Installation selon la revendication 3, caractérisée en ce que pour le dosage du produit d'épandage recueilli il est prévu, dans le séchoir (16) un dispositif d'extraction (5) et pour le séchoir (16) un générateur de gaz chaud (22), des dispositifs de régulation (47, 48, 49) étant associés au dispositif d'extraction (5), au séchoir (16) et au génerateur de gaz chaud (22), de manière que le débit de produit d'épandage soit réglé en fonction de la température de l'air évacué du séchoir (16).
EP88110990A 1987-07-23 1988-07-09 Procédé et installation de traitement de produits granulaires utilisés dans le traitement hivernal de chaussées Expired - Lifetime EP0300297B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT88110990T ATE67257T1 (de) 1987-07-23 1988-07-09 Verfahren und anlage zur aufbereitung von fuer den winterdienst eingesetztem streugut.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH2800/87A CH672753A5 (fr) 1987-07-23 1987-07-23
CH2800/87 1987-07-23

Publications (2)

Publication Number Publication Date
EP0300297A1 EP0300297A1 (fr) 1989-01-25
EP0300297B1 true EP0300297B1 (fr) 1991-09-11

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EP88110990A Expired - Lifetime EP0300297B1 (fr) 1987-07-23 1988-07-09 Procédé et installation de traitement de produits granulaires utilisés dans le traitement hivernal de chaussées

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EP (1) EP0300297B1 (fr)
AT (1) ATE67257T1 (fr)
CH (1) CH672753A5 (fr)
DE (1) DE3864769D1 (fr)
DK (1) DK166629B1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105970769B (zh) * 2016-06-03 2019-02-26 徐州徐工养护机械有限公司 一种水平扩展式沥青混合料成品仓

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4523988A (en) * 1983-08-18 1985-06-18 Apache Equipment, Inc. Apparatus and method for producing virgin and/or reclaiming used abrasives
DE3606238C2 (de) * 1985-03-11 1997-05-07 Gen Kinematics Corp Schwingscheider

Also Published As

Publication number Publication date
DE3864769D1 (de) 1991-10-17
EP0300297A1 (fr) 1989-01-25
ATE67257T1 (de) 1991-09-15
CH672753A5 (fr) 1989-12-29
DK166629B1 (da) 1993-06-21
DK411888A (da) 1989-01-24
DK411888D0 (da) 1988-07-22

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