FR2819832A1 - DISCONTINUOUS COATING PLANT COMPRISING A MOUNTING CONSTRUCTION - Google Patents

Abstract

At least part of the components of the coating plant (1) consisting of the dryer (7), the gas filtration means (9) of the dryer, the fines recovery means (8a, 8b), the mixer (10a) and means (10b, 10c, 10d) for metering aggregates, powder and bitumen, the screening means (12) and the storage means (11) of the dried aggregates is arranged in a frame (6) comprising a first bar (6a) and a second bar (6b) of substantially parallelepiped shape each having a horizontal longitudinal axis and a vertical direction in which at least two stages (14a, 15a, 16a, 14b, 15b, 16b) of support of a The two bars are placed with their longitudinal axes forming an angle between them which can be 900. The longitudinal axes of the bars (6a, 6b) of the frame (6) can also be parallel and offset with respect to each other. 'a certain distance in a direction perpendicular to the two a longitudinal xes. A dried aggregate elevator (18) is placed in a junction zone (17) of the first bar (6a) and the second bar (6b) of the frame (6).

Description

The invention relates to a batch coating plant arranged

  in a frame facilitating the mounting and transport of the coating plant.

  Discontinuous coating plants are known which comprise mainly

  in addition, an aggregate dryer of the drum type with axial gas and aggregate circulation and a mixer into which the aggregates are introduced.

  dried, bitumen and fine materials, to carry out the preparation of

  stones made of aggregates and fine materials covered with bitumen. The coated materials are taken out of the mixer to be transported

  and discharged into storage hoppers. The mixes are then removed.

  taken into the hoppers and transported by trucks to the road construction site

  o they are spread and compacted.

  In addition to the

  dryer and mixer, various components that are required

  res in particular to ensure transfer, storage and classification

  particle size of the materials used.

  The coating plants include in particular means for recovering and filtering the gases from the dryer, means for recovering fines in the gases from the dryer as well as means for transfer and

  means for screening dried aggregates.

  The coating plants also include means for feeding

  specification of the mixer in dried aggregates, in fines and in bitumen and

  means of evacuating and storing bituminous mixes such as skips and

  mies. The various components of a asphalt mixing plant must be mounted on site to ensure the transfer of the different materials used for the manufacture of asphalt, under conditions ensuring

  efficient and economical operation of the plant.

  The assembly operations of the components of a power plant on the

  site require precise adjustment of component positions and can

  wind take a relatively long time, before we can start the

  plant for the production of asphalt.

  In particular, in the case where these mounting operations are repeated

  tives, for asphalt plants which are moved from one site to another, the transport and assembly of the components of a asphalt plant

  may be accompanied by excessive costs and lead times.

  It has already been proposed to group certain components of a power plant

  of coating, inside a vertical frame, in the form of a tower of coating

  bage which comprises, from bottom to top, the mixer, storage hoppers of

  aggregates and the screening plant for dried aggregates.

  On the other hand, the other essential components of the power plant

  bage, namely the dryer, filters and fines storage silos, as well

  that the asphalt storage hoppers must be mounted independently

  each other on site, so that they can supply

  the coating tower for dried aggregates and fines recovered during drying

aggregate chage.

  The dryer, which generally consists of a rotating drum

  by one end of which a burner penetrates, carries out a drying of the granules

  lats by counter-current circulation of the aggregates and the burner gases inside the drum, the gases containing fines separated from the aggregates

  during drying to be evacuated and treated so as to dust them-

  rer. The fines separated from the dryer gases are generally reused

as additives in the mixer.

  The assembly of the components constituted by the drum dryer, the filters for removing dust from the dryer gases and the storage silo (s)

  fines require operations which can be long and costly.

  The object of the invention is to propose a central coating plant

  continuous comprising an aggregate dryer of the drum type with axial circulation of gases and aggregates, means for recovering and filtering the gases from the dryer, means for recovering fines in the gases of the dryer, transfer means and means for screening dried aggregates, and a mixer comprising means for metering and supplying dried aggregates, fines and bitumen, for the preparation of mixes consisting of aggregates and fines covered with bitumen as well as means of disposal and asphalt storage, this plant being carried out

  so that it can be easily and quickly mounted on the user site.

  sation, from components whose transport is facilitated.

  To this end, at least part of the components of the power plant

  system consisting of the dryer, the gas filtration means, the means for recovering fines, the mixer and the means for metering the dried aggregates, the pulverulent and the bitumen, the screening means and the means for storing the dried aggregates is arranged in a frame comprising a first bar and a second bar of substantially parallelepiped shape, each having a horizontal longitudinal axis and a vertical direction in which are arranged, superimposed, at least two support stages of a component, the two bars being placed with their longitudinal axes offset and having a connecting part extending in the vertical direction, along which the

  means for transferring dried aggregates constituted by an elevator.

  In order to clearly understand the invention, we will describe by way of example

  ple, with reference to the attached figures, a coating plant

according to the invention.

  Figure 1 is an overview of a coating plant following

  the invention in the operating position on a site of use.

  Figure 2 is a perspective view of the two bars of the frame of the

  central unit containing components in superimposed arrangements.

  Figure 3 is a perspective view of a first bar of the frame

  of the plant containing in particular the aggregate dryer.

  Figure 4 is a perspective view of a second bar of the cent

  in particular containing the mixer for the production of mixes.

  Figure 5 is a perspective view of the entire frame of the

  central and its means of access devoid of its functional components-

  tional. In Figure 1, we see a coating plant designated so

  general by reference 1 and which mainly comprises a pro-

  duction, generally designated by the reference 2 and a storage unit

  asphalt mix designated by reference 3.

  The production unit 2 and the asphalt storage unit 3 are available

  located on the site near each other, so that guide means 4 of a skip 5 for transporting asphalt mixes are fixed between a lower part of the production unit 2 and an upper part of the storage unit 3 to allow the circulation of the skip 5 which provides transport

  asphalt mixes produced in production unit 2 up to the upper

  lower of the storage unit 3 constituted by a set of hoppers 3a, 3b, 3c, 3d. As can be seen in Figures 1 and 2, the production unit 2 of the

  coating plant comprises a frame 6 in which the various

  annents components of the coating plant, namely the drying drum 7, two hoppers for recovering and storing fines 8a and 8b, a set 9 for filtering the gases from the dryer, a mixer 10a above which are

  disposed means 10b for dosing aggregates, means 10c for dosing

  wise powder and 10d bitumen metering means, a device

  1 1 for aggregates storage and a screen 12 to ensure the classification

  particle size cation of the aggregates introduced into the storage device

kage 1 1.

  The frame 6 of the production unit 2 of the coating plant comprises

  carries two elements 6a and 6b of overall parallelepiped shape and

  each carrying a framework constituted by metal profiles assembled

  locked together delimiting compartments superimposed in the vertical direction, each compartment being intended for the support and mounting of one of the components or set of components 7, 8a, 8b, 9, 10a, 10b,

  1Oc and 1 Od, 1 1 and 12 from the power plant.

  Each of the elements 6a and 6b which comprises a base and three stages superimposed in the vertical direction will be designated under the

  term "bar" by analogy with building bars comprising a greater

  reality of floors. Each of the bars 6a and 6b comprises a base 13a (or 13b), a first stage 14a (or 14b), a second stage (15a (or 15b) and a third stage 16a (or 16b), the base and each of the stages

  can be made in the form of a module, comprising a parallel frame

  the epipedic made up of straight bars. Each of the assemblies constituting a basement or a stage comprises a parallelepipedic framework whose edges are arranged in a longitudinal direction and in a

  horizontal transverse direction and in the vertical direction along the-

  which the base and the floors are superimposed.

  Each of the stages 14a, 15a, 16a, 14b, 15b, 16b is intended to receive

  see one of the components of the control unit which were mentioned above.

  The components can be mounted inside the frames constituting each of the modules and transported inside these frames to be stacked

  on the site of use of the asphalt plant, the various modules adjja-

  cents stacked on top of each other being fixed on top of each other by mechanical means

  -mechanical. It is also possible to make the frames of each of the bars

6a and 6b as a single unit.

  As can be seen in Figures 1 and 2, the two bars 6a and 6b

  are placed and fixed in relative provisions such as their directors

  longitudinal positions are perpendicular to each other.

  More generally, the two bars could be placed so that their longitudinal directions make an angle between them

  any less than 180 (for example 120).

  The two bars 6a and 6b have a junction zone 17 extending

  in the vertical direction near the dihedral angle formed by the two bars 6a, 6b. In zone 17, there is an aggregate elevator

  18 vertical and mounted in the joining part of the bar 6b.

  In general, the two bars 6a and 6b are arranged relative to each other so that their longitudinal directions are offset, either angularly, the longitudinal directions forming an angle between them, for example 90, as shown in Figures 2 and 3, this arrangement being called L-shaped arrangement, or misaligned, the directions

  longitudinal of the two bars 6a and 6b being parallel to each other but

  wedged relative to each other, a certain distance in a direction perpendicular to the longitudinal directions, this arrangement being called Z-arrangement. Inside the first stage 14a of the bar 6a is placed the drying drum 7 which is rotatably mounted, inside the stage 14a of the bar 6a around its longitudinal direction axis which is slightly inclined relative to the horizontal plane, the inlet end 7a of the drum by which the aggregates are introduced wet being at a higher level from the end of

  outlet 7b of the drum through which a burner 19 is introduced. In this way

  Finally, the aggregates and the gases from the burner 19 circulate against the current inside.

  drum 7, the aggregates being collected at the outlet end 7b

  and dumped into a receiving part of the aggregate elevator 18.

  The gases circulating in the drum 7 are loaded with fine materials detached from the aggregates and are evacuated by means of a collection hood 20 connected to a lower part of the recovery hopper 8b.

fine.

  In FIG. 3, the outlet end of the dry drum is shown.

  cheur 7 without the external structure comprising the burner fan.

  The gases at the outlet of the drum, recovered by the hood 20, are sucked

  res through the filter 9 which is a bag filter and the hopper 8b, by a uni-

  suction tee 21 disposed in the upper stage 16a of the bar 6a, adjacent to the bag filter 9. In this way, the charged gases

  fine materials are sucked through the hopper 8b in which is deposited

  smells of materials having a particle size similar to that of fine sand and through the filtration elements of the bag filter 9 on which are deposited the pulverulent materials having the particle size of a fine powder. The powdery materials stopped by the filter elements of the filter

  with handle 9 fall into the hopper 8a, recovering pulverized material

  rulents. When assembling the components of the successive stages 14a, 15a and 16a of the bar 6a, the recovery hood is connected to the hopper 8b in its lower inlet part and the upper outlet part of the hopper 8b to the inlet of the bag filter 9. Likewise, the upper part of the recovery hopper 8a is connected to the

  baghouse filter chamber 9.

  The base 13a may have a variable height less than the height of a stage of the bar, this height being chosen so as to

  ability to recover materials below the drying drum 7 or eff-

  possibly carry out maintenance operations on the drying drum 7. As can be seen in FIGS. 1, 2 and 4, the second bar 6b of the

  frame 6 comprises, above its base 13b, the stage 14b of the ma-

  laxeur 10 Oa, the stage 15b of the storage device 11 for the dried aggregates and the upper stage 16b of the device 12 for screening the dried aggregates in

the drying drum 7.

  According to the part 17 of junction of the bar 6b with the bar 6a is disposed, in the vertical direction, inside the bar 6b, the aggregate elevator 18, which can for example be a bucket elevator which takes loads the dried and hot aggregates at the outlet of the drum 7 to transport them in the vertical direction through the stages 14b, 15b and 16b, to a level situated above the upper stage 16b and a hopper d entry of the screening device 12. A chute 22 makes it possible to discharge the

  hot aggregates inside the screen 12 which performs a screening and a classification

  - particle size distribution of the aggregates which are introduced, according to their size, into different compartments of the storage hopper 11 disposed

  above the inlet of the means 10b for dosing dried aggregates of the ma-

  laxeur 10a. The metering means 10b is arranged above the mixer 10a and carries out the introduction in metered quantity, into the mixer 10a, of aggregates coming from the different parts of the storage hopper 11 in which the aggregates are stored by size-grading slice. Above the mixer 10a, there are also arranged means 10c for the metered introduction of fines coming either from the fines recovery hopper 8a placed in the bar 6a of the frame 6, or from a powder storage hopper placed on the site of use of the coating plant, in

  outside the frame 6 and means for metering and introducing bitumen 10d.

  One carries out, inside the mixer 10a, the mixing of the aggregates

  hot and dried, fines consisting of powder and bitumen, ma-

  nière to obtain, at the outlet of the mixer 10a, bituminous mixes which are

dumped into the skip 5.

  The skip 5 is brought under the mixer, thanks to the guide means 4 in the space provided by the base 13b resting on the ground of the site. When a load of asphalt has been dumped in the skip, it is moved to the upper part of the guide means, to reach above the hoppers of the storage unit 3. The asphalt contained in the skip are poured into a mobile distribution hopper which distributes the mixes between the different hoppers 3a, 3b, 3c and 3d of the unit

storage 3.

  Instead of a skip, we could use a raclette conveyor whose

  arrangement would be that of the guide means 4 of the skip 5, between the base-

  13b of the bar 6b and the upper part of the storage unit 3.

  FIG. 5 shows the frame 6 of the coating plant devoid of the components of the plant, the stages 14a, 15a, 16a,

  14b, 15b and 16b provide housing and maintenance in the operating position-

nelle.

  Each of the stages 14a, 15a, 16a, 14b, 15b, 16b has a plan-

  expensive to work, each of the floors being accessible from the floor of the chan-

  tier, by a set of stairways 23a, 23b, 23c fixed according to

  one of the faces of one of the bars 6a, 6b of the frame 6, for example the direct face

  towards the interior corner of the bars.

  It should be noted that the floors of the two bars 6a and 6b are of the same height, so that the working floors are at the same

level for each of the floors.

  A single set of gateways 23a, 23b, 23c therefore makes it possible to

  serve all floors of the frame. The work floors are also

  dice on the inside and on the outside of the bars, by ram-

  bards 24 for protecting the staff of the asphalt mixing plant.

  As indicated above, each of the bars 6a and 6b of the frame 6 may comprise a set of modular frame elements each constituting a stage, these modular elements having dimensions similar to the dimension of maritime containers with a length of 30 or 40 feet. We

  can easily transport each of the modular elements in the-

  which has been fixed beforehand at least one equipment of the power plant

  bage, such as the dryer, the mixer and the means for metering aggregates, powder and bitumen, silos for recovering fines, the filter

  handle, the screening device or the gravel storage device

nulats.

  Each module can be brought to the site and the job can be done.

  crushing of the modules to constitute the two bars 6a and 6b.

  We first carry out the installation of the

  elements 13a and 13b on the site floor, the timing of the foundations 13a

  and 13b being produced so as to obtain an upper bearing surface by-

  completely horizontal. The two bases are arranged so that the two bars can be placed in a 90 ° arrangement such that

shown in the figures.

  The modules constituting each of the stages are then stacked and the parts of the components allowing the circulation of the components are connected together.

  solid materials and gases in the asphalt plant.

  The asphalt plant frame can be installed without it being

  stop planning civil engineering elements, such as slabs,

  crages or supports on the ground of the site where the power plant is used

  robage. Due to the construction of the frame, the components of the power plant

  are placed in relative positions allowing to put

  during operation the asphalt mixing plant without prior adjustment.

  The coating plant according to the invention can therefore be easily transported and mounted on a site to be used as an installation

  fixed for an extended period or, on the contrary, as a traveling installation

  rante that can be transported from one site to another.

  The invention is not limited to the embodiment which has been described.

  Thus the arrangement of the components of the power plant in the successive stages of the two bars of the frame can be different from that which has

been described.

  In particular, the stacking order of the drying drum,

  recovery of powders and the sewage gas purifying filter

  may be different from what has been described.

  Each of the bars has at least two superimposed stages.

  In the case of bars comprising only two stages, the means of

  filtration and storage of fines from the first bar and the screening means

  the second bar is used for storage and storage of dried aggregates

  on the same floor. It is also possible to provide a power station, a first bar of which is constituted by a coating tower and a second bar made

  analogously to the bar 6a of the device which has been described comprises

  both the drying drum, the powder storage hoppers and the filters

purifying gases from the dryer.

  Of course, the coating plants according to the invention may include elements other than those which are housed in the two bars of the frame and for example one or more hoppers for storing powdered materials and one or more hoppers for storing coated materials. as well as tanks

  fuel storage to power the dryer burner and bi-

  tume to supply the mixer distribution device.

  As indicated above, the two bars can be placed in

  a position offset angularly or in parallel but in arrangements

  tions with longitudinal axes offset in a direction perpendicular to a longitudinal direction in a horizontal plane of section of the two bars of the frame. In the case where the drying drum is placed on the upper floor of

  one of the bars of the frame, the aggregate elevator occupies only the upper part

  of the junction area of the two bars, to transport the granules

  hot dried lats, between the outlet of the drying drum and the upper part

  input of a screening device.

  The invention allows mounting to be carried out quickly and easily.

  on a site of a batch type asphalt mixing plant.

Claims (10)

  1.- Discontinuous coating plant with a granular dryer   lats (7) of the drum type with axial circulation of gases and aggregates, means of recovery and filtration (20, 9) of the gases from the dryer (7), means of recovery (8a, 8b) of fines, in gases from the dryer (7),   screening means (12) and storage means (11) of dry aggregates   chés and a mixer (10a) comprising means (lOb, 10c, 10d) for   wise and supply of dried aggregates, fines and bitumen, for the   preparation of asphalt consisting of aggregates and fines covered with bi-   tume as well as means of evacuation (4, 5) and storage (3) of asphalt,   characterized in that at least part of the components of the cen-   coating hopper (1) consisting of the dryer (7), the gas filtration means (9), the fines recovery means (8a, 8b), the mixer (10a) and the means for metering the dried aggregates , powder and bitumen (lOb, 10Oc, 10d), the screening means (12) and the storage means (11) of the dried aggregates, is placed in a frame comprising a first   bar (6a) and a second bar (6b) of substantially parallelepiped shape   that each having a horizontal longitudinal axis and a direction ver-   - ticale along which are arranged, in a superimposed manner, at least two stages (14a, 15a, 16a, 14b, 15b, 16b) for supporting a component (7, 8a, 8b, 9, 10a, 10b, 10c, 10d , 11, 12), the two bars (6a, 6b) being placed with their longitudinal axes offset and comprising a joining part (17) extending in the vertical direction in which is placed a means of   transfer (18) of dried aggregates constituted by an elevator.   2.- coating plant according to claim 1, characterized in that the longitudinal axes of the first bar (6a) and the second   bar (6b) of the frame (6) of the coating plant (1) are angularly offset   relative to each other, so as to form an angle between them laughing at 180.   3.- coating plant according to claim 2, characterized by   causes the longitudinal directions of the first bar (6a) and the se-   conde barre (6b) of the frame (6) of the coating plant make between them a year- 90 gle.   4.- coating plant according to claim 1, characterized in that the longitudinal axes of the first bar (6a) and the second bar (6b) of the frame (6) are mutually parallel and offset one by compared to   the other, in a horizontal plane of section of the frame, in a direction per-   pendulum to the axes of the first and second bars (6a, 6b).   5.- coating plant according to any one of claims   1 to 4, characterized in that the first bar (6a) of the frame (6) has three superimposed stages (14a, 15a, 16a), a first stage (14a) containing the dryer (7), a second stage (15a ) containing the means (8a, 8b) for recovering fines and the third stage (16a), the filtration means (9) of the gases from the dryer (7), and that the second bar (6b) also comprises three stages, one first stage (14b) containing the mixer (10a) and the means for dosing dried aggregates, pulverulent and bitumen (10b, c, 10d), a second stage (15b) containing the aggregate storage device (11 and a third stage (16b) containing a screening device (12) aggregates.   6. A coating plant according to claim 5, characterized in that the first stage (14a) of the first bar (6a) of the frame (6) and the first stage (14b) of the second bar (6b) of the frame (6) rest on a respective base (13a, 13b) itself resting on the ground of a site   of use of the coating plant (1).   7.- coating plant according to any one of claims   1 to 6, characterized in that each of the bars (6a, 6b) of the frame (6) is   constituted by superimposed modular elements having the form of ossa-   parallelepipedal structures each constituting a base (13a, 13b)   or a stage (14a, 15a, 16a, 14b, 15b, 16b) of the fixed frame.   8. Central according to claim 7, characterized in that each of the modular elements of the first bar (6a) and the second bar (6b) of the frame (6) of parallelepiped shape defining a stage of the first or the second bars (6a, 6b) have the dimensions of a shipping container.   9.- coating plant according to any one of claims   7 and 8, characterized in that each of the modular elements of the   first bar (6a) and the second bar (6b) of the frame, of parallel shape   piped, is made by assembling straight profiled bars and   carries mechanical fastening elements on at least one modular element adjacent area.   10.- coating plant according to any one of claims   1 to 9, characterized in that the stages (14a, 15a, 16a, 14b, 15b, 16b) of the first bar (6a) and the second bar (6b) of the frame (6) have identical heights in the vertical direction and each have a work floor, the work floors of the first and   the second bars (6a, 6b) of the frame (6) being served by the same assembly-   ble (23a, 23b, 23c) of stairways-gangways fixed along a vertical face of   one of the first bar (6a) and the second bar (6b) of the frame (6).