FR2460704A1 - DEVICE FOR THE TREATMENT WITH A FLUID OF A SUBSTANCE LIKELY TO FLOW - Google Patents

Abstract

A DEVICE FOR THE MECHANICAL, THERMAL OR CHEMICAL TREATMENT OF A SUBSTANCE LIKELY TO FLOW, IN PARTICULAR A SUSPENSION, BY AT LEAST ONE FLUID, INCLUDES AT LEAST ONE TREATMENT ZONE 1. THIS IS PRACTICALLY VERTICAL IN SPACE AND IS BROUGHT FROM THE BOTTOM UP BY THE TREATMENT FLUID 2. THE LIKELY LOWING SUBSTANCE TO BE TREATED IS INTRODUCED INTO THE TREATMENT AREA. THE PROFILE OF THE TREATMENT ZONE BROUGHT THROUGH THE CURRENT VARIES GRADUALLY OR BY STEPS FROM BOTTOM TO TOP. THE CURRENT IS ESSENTIALLY DIRECTED IN ZIG-ZAG IN THE TREATMENT ZONE BY THE SHAPE GIVEN TO THE WALLS 4 OF THIS AND OR BY INCORPORATED GASKETS, IN ORDER TO OBTAIN A DEFINED TURBULENCE AT THE LEVEL OF THE SHARP AREAS OF THE WALL AND OR OF THE INCORPORATED GASKETS .

Description

The invention relates to a device for mechanical, thermal treatment

  or chemical of a substance capable of

  flow, in particular a suspension, by at least one fluid.

  It may, for example, be a washing operation of a raw salt using pure brine. In this case, the impurities of the raw salt must be extracted from it by washing

  and removed by decantation or sedimentation.

  As an example of a device for the chemical treatment of substances liable to flow, mention will be made

agitator vessels of different models. Their main role

cipal is to gather and mix the elements put in reaction.

  As an example of a device for the heat treatment of substances liable to flow, heat exchangers are known. In the case of the direct action heat exchanger, its main role is to bring together, mix and, if necessary, then separate the elements, for example

in a stuffing apparatus.

  Regarding the mechanical treatment of substances

  these likely to flow in the sense of the invention, we cite-

ra sedimentation apparatus and vessels, hydrocy-

  clones, sorting and sieving devices, where

intervene the force of gravity.

With such devices, it is common to learn

plique all of the methods of treatment mentioned, that is to say, mechanical as well as chemical or thermal, individually or in combination.

With the treatment devices mentioned,

Very specific requirements are imposed as to the time of stay of the elements. This is how it can be for example

required that the solid particles of a suspension to be treated remain

  try as much as possible in contact with the treatment fluid for the same period of time, calculated from the moment when the particles come into contact with the fluid until the completion of the treatment or until that the particles leave the device. In particular, it should not be possible to form, along the treatment current, any dead zone in which the contact time available for treatment would be significantly longer than the average contact time on

the whole processing current.

In previously known devices, allowing

  perform alone or in combination with mechanical treatments

  ques, thermal and chemical, the specific adaptation of the dwell time spectrum to the particle size spectrum is only possible imperfectly. Processing times for oversized and undersized grains are reduced and undesirably increased in the devices, respectively

previously known.

With the present invention, it is desired to achieve that the mechanical, thermal or chemical treatment of a substance liable to flow, carried out individually or in combination, takes place in such a way that in the case of fluids free of particles, a narrow and perfectly defined time spectrum of

stay is maintained and that in the event of a suspension

  of particles to be treated, their residence time spectrum

is specifically adapted to the particle size spectrum.

  In a device for mechanical treatment, ther-

  mique or chemical of a substance liable to flow, in particular from a suspension, by at least one fluid, this object is achieved according to the invention by the fact that it is provided at least

  a treatment area that is practically vertical in the es

  pace and is traversed from bottom to top by the treatment fluid

  and into which the substance liable to escape is introduced

  flow which must be treated, the profile of the treatment zone traversed by the current varying gradually or in steps

from bottom to top and, moreover, the current being directed essential-

  zigzag in the treatment area by the shape given to the wall

  thereof and / or by incorporated linings, in order to obtain a turbu-

  lence defined at the sharp edges of the wall and / or incorporated fittings. According to a possible embodiment, this desired flow

is obtained by the fact that the treatment zone is delimited between parts

kings in the shape of a zigzag.

The capacity of the device can be increased by having several treatment zones parallel to each other and by connecting them

between them.

  According to a preferred embodiment, the profile of the treatment zone traversed by the current gradually widens in the direction of flow; such treatment zones are then arranged in a fan shape and connected in parallel, so that each treatment zone has,

  with its neighbor, a common wall, limiting the two zones.

According to another possible embodiment, the processing zones

  are annular and the profile traversed by the current progressively widens

  in the direction of flow; such treatment areas are used

  tees coaxially one inside the other.

In the treatment zone according to the invention, in which the inten-

sity of the current varies with the variation of the profile traversed by the current, a

  wider particle size spectrum is treated with an approximate residence time

matively equal.

  Moreover, the object of the invention will be described and explained in detail.

more detailed lesson with the help of some examples of realization illustrated by

the drawings.

FIG. 1 is a schematic view in longitudinal section of a pre-

mier example of achievement.

  Figures 2 and 3 show axially a second and a

  third embodiment in detail.

  Figure 4 illustrates another embodiment, shown

axonometrically in elevation.

Figure 5 shows an example of Figure 4 in schematic longitudinal section. Figure 6 is a sectional view, taken along the line VIVI of the

figure 5.

The device for mechanical, thermal or

  chemical of a substance liable to flow, in particular

-4 culier a suspension, with at least one fluid, comprises at least one treatment zone which is designated by 1 in all the figures. The treatment area is practically vertical in space. That is to say, a slight inclination of the treatment zone relative to the vertical is possible, as is

  will see later in some embodiments.

  The treatment zone is traversed from bottom to top by a treatment fluid which is introduced through a pipe 2. The substance liable to flow which must be treated is

introduced into the treatment zone via a pipe 3.

  The profile of the treatment zone traversed by the cou-

  rant varies gradually or in steps from bottom to top.

  Figures 1 and 5 show that the profile widens by

bottom up.

The treatment zone is provided with zigzag-shaped walls 4, as can be seen particularly clearly in FIGS. 1, 5 and 6, or else there are provided

  incorporated fittings 5 in the form of a zig-zag. Such garnitu-

res are shown axonometrically in Figures 2 and 3.

These incorporated walls or fittings direct the cou-

  rant through the treatment area, so that a defined turbulence occurs at each of their

sharp edges. This current guidance leaves no dead zone.

The variation in the profile of the treatment zone traversed by the current is accompanied by a corresponding variation in the speed

  of flow. Areas where flow is slower or narrows

lentit are planned and sized for the treatment of the most

  small particles in the particle size spectrum.

In order to increase capacity, some processing zones

are arranged and joined in parallel, as shown in the

figure 1.

A method of constructing the device of the invention, saving space and materials, is shown in the

Figures 4 to 6 for the case of enlarged treatment zones

  gradually feels from bottom to top.

The treatment zones are directly contiguous, so that each treatment zone has, with its neighbor, a common wall which respectively delimits the two zones on one side. This results in a fan-shaped structure, as can be seen in particular in FIG. 5. The different

  annuity zones each have a rectangular cross section.

According to another embodiment, the areas of

treatment have an annular shape. They are arranged coaxia-

relative to each other and are nested one inside the other. An erf axial longitudinal section view of

this device has the same appearance as that of FIG. 5. Any-

  times, the zones are conical structures with symmetry of revo-

lution. The operating mode of the device, transposable

universally to other mechanical and thermal treatments

ques, chemical or combined, will now be described as

example about a washing and separation operation.

A soiled suspension must be treated with a liquid

of washing. Solid matter particles must be separated from soiled matter. For example, it’s

  process raw salt with pure brine. -

Raw salt, which is soiled by elements in solu-

tion or undissolved, is backwashed in the device with pure brine. In the equipment used for this purpose, for example of the type shown in FIGS. 5

and 6, the supply of raw salt is carried out each time by the

barrel 3 arranged laterally, in the upper part of the treatment zone. The pure brine reaches the treatment zone from below via line 2. In each section of the treatment zone, delimited by two elbows adjacent to the

  wall, it reigns, as a result of the gradual widening of the-

  treatment area, a predominant average driving force, so that one can associate -a particle size-defined at each level of the device. In this way, we manage to retain in the treatment zone, at the top of the device the small particles which are likely to be entrained outside and at the bottom of the device the large particles which strongly sediment, and to subject them to the process. of washing for a period of

  stay similar, as do particles of medium size.

  For balance sheet reasons, when operating in a

stationary, a current is extracted at the top of the apparatus.

particles containing mainly small particles of salt as well as suspended matter and, at the bottom of the apparatus, a stream of particles containing mainly large particles as well as matters depositing in flowing water, streams which correspond together to the stream of particles

  at the feed funnel.

Claims (6)

1. Device for mechanical and thermal treatment or chemical of a substance liable to flow, in particular pour a suspension, with at least one fluid, characterized in   that at least one treatment area is provided which is practical   vertical in space and which is traversed from bottom to top by the treatment fluid and into which the   leakable substance to be treated, the pro-   wire of the treatment zone traversed by the current varying progressively or in steps from bottom to top and, moreover, the current being directed essentially in a zig-zag in the treatment zone by the shape given to the wall thereof and / op by incorporated linings, in order to obtain a defined turbulence at the sharp edges of the wall and / or the inserts   corporates. 2. Device according to claim 1, characterized in that the treatment zone is delimited between walls in zigzag shape. 3. Device according to claim 1, characterized in that several treatment zones are arranged and joined   in parallel with each other. 4. Device according to claim 1, characterized in that the profile of the treatment zone traversed by the   current gradually widens in the direction of flow.   5. Device according to claim 3 or 4, character-   laughed at in that the treatment zones are juxtaposed and joined in parallel, each treatment zone having, with its neighbor, a common wall which limits the two zones, so that all the treatment zones, seen together in section   longitudinal, form a fan structure.   6. Device according to claim 1 or 3, character-   laughed in that the treatment zones are annular, in that   as their profiles crossed by the current widen progress- in the direction of flow and in that the annular treatment zones are arranged coaxially with one another and   nested one inside the other.