DD136927B1 - ANROASTIVE FLOOR FOR SWIVEL LAYER APPARATUS - Google Patents

Description

Field of application of the invention

The invention relates to the field of fluidized bed technology and can be used to treat granular substances with fluid.

Media can be applied in a fluidized bed.

The processes involved can be drying, granulation or chemical reactions.

Characteristic of the known technical solutions

There are known fluidized bed apparatus with homogeneous mixing of the swirling good:

USSR Pat. 303488

GB Pat. 1106194

US Pat. 3890935

US Pat. 3814176

US Pat. 3817872

Furthermore, fluidized bed apparatus in which the material moves through certain flow conditions on circular or elliptical paths, known.

BROOS 2326792

GB Pat. 1,144,320

DOR Pat. 63 611

BRDAS 1442813

Furthermore, fluidized bed channels over which the material migrates in a fluidized state are used in the art.

FRG Patent 1729279

BRD-AS 2426714

BRD-AS 2320614 ^

DDRWP 101747

DDRWP 104720

DDRWP 56478

In the first two types of apparatus mentioned, the complete mixing of the layer means that even particles that have just gotten into the apparatus are immediately discharged from it, or that other particles remain in the apparatus for an above-average length of time.

In the case of the fluidized bed channels, the product, although defined, travels the length of the channel, but the air distribution under the channel and the edge effects become less favorable with increasing length of the channel.

There are known fluidized bed apparatus with homogeneous mixing of the material to be swirled, US Pat. 3565022, in which both suspensions can be dried and granulated, wherein the heat-sensitive suspension is fed into the fluidized bed. The agglomerates that form in this process are dried in the air stream required for producing fluidized beds, which may lead to local overheating as a result of the turbulent flows of the fluidized beds, since particles that have just got into the apparatus are immediately discharged from the same or stay longer than necessary in the apparatus.

Furthermore, fluidized bed apparatus in which the material moves through certain flow conditions on circular or elliptical paths, DD-WP 119304, known. These flow conditions are formed by a arranged in the fluidized bed apparatus distributor plate which is cup-shaped with an inclination angle a <20 ° and perforated, wherein the holes are arranged so that an opening ratio φ of free hole area results to the total hole area, which from the center to the periphery continuously and As the falling velocity of the particles at constant air flow rate is a function of the particle diameter, all of the particles of a given diameter sink into an exit lock without adequate drying.

Furthermore Wirbelschichtrinneh are known that the solution of the invention is so far obvious, DE-AS 2218034, that a fluidized bed apparatus for drying and / or cooling fine bulk materials with an elongated fluidized bed, enter the perforated bottom an air supply box is arranged, which at least with the bed forms a vibrator in directional vibration offset unit is applied. The disadvantage of the device is that the air distribution below the gutter and the edge influences with increasing length of the gutter and bulk density are unfavorable. It is also known to arrange gas-impermeable partitions as guide elements in fluidized bed plants, DE-AS 2217578, for improving the transport and drying effect of the product.

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Object of the invention

The object of the invention is to treat a solid particle mixture consisting of solid particles of different diameters with a fluid medium so that the residence time for the large particles is the same and an improvement in the quality of the product is achieved.

Explanation of the essence of the invention

The invention has for its object to provide a fluidized bed apparatus with a distributor plate, which is designed so that it separates the small particles from the large particles of a particle mixture, the small particles for a shorter time and the large particles for a long time with a fluid medium in Be brought in contact. This process should be carried out as possible in a compact apparatus.

In the already known solutions (homogeneous mixing of the layer or circular or elliptical path of the solid particles) it comes through the spectrum of the residence time that both individual particulate leave the machine immediately after entering the same again and thus not enough time with the fluid media were in contact as well as other particles remain too long in the apparatus. This happens regardless of the size of the particles.

Although an almost uniform residence time of all particles is achieved in the fluidized bed channels, the apparatuses, due to their channel-shaped design, have an unfavorable shape for the air distribution as well as increased edge influences.

Description in static condition

According to the invention the object is achieved in that a distributor plate made of expanded metal is arranged in a known fluidized bed apparatus with a rectangular cross-section. The expanded metal is divided into individual segments.

In the individual segments, the direction of the slots of the expanded metal is different.

Likewise, the expanded metal may have different opening ratios in the individual segments. Between individual segments vertical gas-impermeable partitions are attached. Perpendicular to the flow direction of the solid are mounted at a height of 50 to 200 mm from the ground baffles of expanded metal. These baffles have a large aperture ratio and are arranged so that the opening of the expanded metal points downwards. The baffles are inclined to the vertical up to 45 °.

In the corners of the apparatus in which the solid is deflected, triangular baffles are mounted, wherein the openings are arranged at a viewing angle of preferably 45 ° from the corner to the longitudinal direction.

Description of the function

Due to the arrangement of different expanded metal segments on the distributor plate, a transport effect in the horizontal direction is transmitted to the material to be treated with a fluid medium. It is surprising that the transport effect acts more strongly on the large particles of a particle mixture and thus on the one hand a directed flow of solids in one or more desired direction is achieved and on the other hand the particulate mixture is partially demixed, the small particulate matter are discharged upward, while the large particles on a defined path, which can be determined by the arrangement of the expanded metal segments and the partition walls arranged between them, pass through the apparatus. Thus, the large particulates have a longer and defined residence time in the apparatus, while the small particles only briefly contact the fluid medium and then immediately leave the apparatus overhead.

It is also surprising that the desired type of flow guidance is improved by perpendicular to the flow direction baffles made of expanded metal, when the height of the baffles is 200 mm and are mounted at a distance of 100mm from the ground.

Embodiment ^f

The invention is explained in more detail below with reference to schematic drawings of two exemplary embodiments.

The first embodiment is shown by FIGS. 1-4.

Fig. 1: shows a possible arrangement of expanded metal segments as a distributor plate in a fluidized bed apparatus Fig. 2: shows a longitudinal section through a fluidized bed apparatus the built-in distributor plate and the arrangement of the

Dividing plates or the baffles and the arrangement of the discharge Fig.3: shows a section through Fig. 2nd

Fig. 4: shows a section through Fig. 3, on which the arrangement of the Guteintrages can be seen in the fluidized bed. As an example, a fluidized bed apparatus for cooling a granular substance is selected.

In a rectangular fluidized bed apparatus 1 is a distributor plate 2, which consists of several expanded metal segments 5,6, 7. Oiese segments 5,6,7 have different opening ratios and different slot directions and are arranged as follows.

In the plan view (FIG. 1), a feed segment 6 with an opening ratio vpn 15% is arranged in the inflow base 2, the base seat direction of which is parallel -. m bottom edge of the ground to the center shows.

The width of this segment 6 is ¹ A of the bottom width and the length of the segment 6 0.2 of the shelf length. The feed segment 6 is followed by conveyor segments 7 of the same width, which have the same slot direction as the feed segment 6, but with an aperture ratio of 5%. These conveyor segments 7 terminate at the bottom end at an angle of 45 ° and pass into a deflection segment 5, which has an opening ratio of 10% and whose slot direction points in the direction of the bisector to the center of the apparatus 1.

In mirror image, another similar deflection segment 5 is arranged, to which further conveyor segments 7 adjoin., Whose slot direction is opposite to that of the first conveyor segments 7 and has an aperture ratio of 5%. These conveyor segments 7 terminate analogously in a deflection segment 5 with a 10% aperture ratio, the slot direction of which in turn points to the apparatus center point 1.

Mirrored to this arrangement, a second conveyor segment pair 7 is arranged with associated deflection segments 5 and the same aperture ratio, wherein the conveying direction of the conveyor segments 7 is rotated by 180 °. Instead of the feed segment 6 is here a downcomer 8, which has the width of a conveyor segment 7. The following area ratios are realized with this apparatus:

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Area of all articulation segments ._ _n Total area ~ ^] ? * ^U / °

Surface of the reception segment _ ς « ψ total area ^» ^ ^{/ ΰ}

Area of all Fördersegmenbe _{ftn n} "" "~ ⁼ Total ^{ÖU> u / o}

between the individual conveyor segments 7 perpendicular partitions 3 are arranged in the manner shown in Figure 1 type, which have a height of Ve the bottom length. Perpendicular to these partitions 3 are further baffles 4 made of expanded metal with an aperture ratio of 25% arranged so that a distance of 100 mm remains between the lower edge baffle plate 4 and bottom. The slot direction of the expanded metal points down.

The invention will be further explained with reference to a second embodiment. The second exemplary embodiment includes FIGS. 5 and 6.

FIG. 5 shows a further possibility of the arrangement of expanded metal segments as distributor plate 2.

6 shows a section through FIG. 5.

In the second embodiment, the expanded metal segments are arranged so that the expanded metals point in a direction parallel to the periphery of the soil at the right and left outer edge of the soil. In this case, a task segment 6 with an aperture ratio of 15% is arranged at the beginning of each page. The width of the two object segments 6 is ^1/3 of the bottom width, length 0.5 of the bottom width.

At this task segments 6 close conveyor segments 7, which have an aperture ratio of 0.5%. The conveyor segments 7 run at the end at an angle of 45 ° out of the apparatus corner The deflecting segments 5 have an aperture ratio of 10% In mirror image to the outer deflecting segments 5, two inner deflecting segments 5 are mounted whose slot direction is perpendicular to the slot direction of the outer deflecting segments 5 and their opening ratio is again 10%.

The inner deflection segments 5 are adjoined by further conveyor segments 7 whose slot directions are arranged opposite to the slot direction of the outer conveyor segments 7. The width of these conveyor segments 7 is Vs of the bottom width, their opening ratio is 5%.

The middle conveyor segments 7 terminate in a downcomer 8. The following area ratios are thereby realized:

Area of all T _term segments _Λη ^ total area " ^{IU / 0}

Area of the task segments - pn ^ total area ~ ^{/ 0}

Furthermore, 7 vertical gas-impermeable partitions 3 are mounted according to the type shown in Fig. 5 between the individual conveyor segments.

Perpendicular to these partitions 3 baffles 4 are made of expanded metal with an aperture ratio of 25%. The slit device of the expanded metal points downwards. Between lower edge baffle plate 4 and bottom remains a free height of 100 mm. The height of the baffles is 200 mm, their width V3 of the bottom width.

Claims (4)

-1- 205 Invention claim: 1. distributor plate for fluidized bed apparatus, in particular fluidized bed dryer with gas-impermeable partitions as guide elements, preferably granular substances are treated with fluid media in a fluidized bed, characterized in that the onflow floor (2) of individual segments (5,6,7) in expanded metal design exists, in which both the direction of the slot openings and the opening ratios are different, wherein between the conveyor segments (7) transversely to the flow direction of the solid baffles (4) are arranged. 2. Floor according to item 1, characterized in that the expanded metal baffles (4) at an angle of 0 to the vertical with an opening ratio φ> 20%, wherein the opening of the baffle plate (4) to the distributor plate (2) shows are arranged: --- 3. inflow base according to item 2, characterized in that in each case over the last conveyor segments (7) in the flow direction triangular expanded metal deflecting segments (5) with the opening direction at an angle of preferably 45 ° to the flow direction, are arranged. 4. inflow base according to the points 1-3, characterized in that the conveyor segments (7) by an expanded metal feed segment (6) with an opening ratio of 10-20% and a downcomer (8) arranged above a conveying member, preferably rotary valve (9) and in turn connected to a task segment (6) of one or more subsequent stages. For this 6 pages drawings