DE3123263A1 - Fluidising device - Google Patents

Abstract

A fluidising device with a blower unit and an expansion conducting nozzle, which are designed in such a way that the suddenly expanding air is always introduced directly tangentially relative to the wall, specifically in such a way that the wall-flow site is considerably reduced between the wall and the bulk material stored.

Description

Air blast device

The invention relates to a method for prevention and / or elimination of bulk material deposits, preferably on bunker or silo walls, or. to that, the To fundamentally improve the flowability of bunkered bulk materials.

It is already known to achieve this goal with air bumpers to be used, which are attached to the outside of the bunker or silo walls, with the air supply Always feed pipes through the walls into the bunker or silo interior.

Such tubes are either directly more or less on the central axis of the bunker or silo or they are angled at a certain distance from the wall that the tubes stir the compressed air more tangentially.

This means that there is a fundamental defect in all such constructions on: The compressed air is always directed against the bulk material itself, i.e. will to achieve a useful effect, the flow location of the respective bulk material must be can be significantly reduced.

At least it depends on the cohesive forces in the bulk material as possible to be completely eliminated.

As a rule, a considerable amount of energy is required for this.

Another disadvantage is that in the direction of the bunker or Silo wall correspondingly large reaction forces occur, which in turn special fastening structures make it necessary on the walls or the z3. with thin-walled sheet steel bunkers or sheet steel silos generally exclude the use of air blast devices.

With the ones already mentioned, at a certain distance from the wall and more or less tangential to this angled pipes occurs when Air leakage against the bulk material is always a moment on the fastening elements of the Lurtschlaggerät is introduced into the wall.

This technology is therefore used for thin-walled bunkers or bunkers.

Silo constructions not considered at all.

Another disadvantage of the direct shooting of the saved Bulky goods with LuSt consists in the fact that a large number of cohesive bulk goods through the Bildvuag reacts by so-called "'air ducts" in which further supplied Blasts of compressed air dissipate.

Such air ducts in turn very often form stable vaults, ie. the opposite of what should be achieved occurs in the worst case.

Beer now uses the invention by proposing a device at which is completely dispensed with, the compressed air in order to reduce the respective Expand the bulk flow location directly against the compact, stored pile allow.

Since the wall yield point always occurring at the same time is always essential is smaller than the flow location of the bulk material and since it is both decreasing Surface roughness of the wall, as well as decreases with increasing pressure, lies in the inventive idea in this context by means of suitable technical measures to take advantage of.

These measures are basically to start with the compressed air jet no longer into the bulk material itself; but against the interface between the bulk material and wall, i.e. the compressed air directly tangential to the bunker or Initiate silo wall.

Here, the outlet opening of the pipe is shaped so that it is wider Luftstrotu of low thickness stops like, so to speak "peeling" between Wall and bulk material is performed.

Feih particles adhering to the bunker or silo walls become in this way sufficiently fluidized.

This avoids the dreaded bridging, because these backs cannot form an abutment on the walls.

Furthermore, in the bunker or. A mass flow achieved in the silo in that the fluidized edge zones of the stored bulk material as a sliding layer, as it were take effect during the discharge process.

In addition, the blow-out unit of the air blast device is in the bunker or inside the silo with an extremely short building expansionsgeitde ; ç æ he, 4ie with the sudden discharge of the compressed air only to very low moment forces leads.

This means that very thin-walled bunkers and / or silos can also be used such air blast devices are equipped without fear of wall damage have to.

Furthermore, it is proposed according to the invention that the blow-out unit so rotatable to stocked that basically a circular surface with a full turn the bunker or. Silo wall can be coated.

Compared to conventional constructions, the invention leads to improved flow effect of the stored bulk material to a far lower energy wall as well as to lower loads on the bunker or silo walls.

The blow-out unit proposed according to the invention with an expansion nozzle for air blast devices is shown in principle as follows: Figure 1 shows the inventive Blow-out unit (1) in connection with expansion nozzle (2) of an air blast device with the bunker or silo wall (3).

Fig.2 shows the blow-out unit (1) according to the invention with an expansion guide nozzle (2) an air blast device in connection with the bunker or silo wall (3) and the basically possible turning device (4) and the mounting plate (5 ).

Fig.3 shows the basically possible turning device (4) as well the mounting plate (5) and furthermore different positions of the basically rotatably arranged expansion nozzle (2)

Claims (4)

Claims 1. LuStschlaggerät according to Fig. 1 and 2 with blowing out unit (1) and expansion guide nozzle (2), characterized in that the suddenly expanding Supply air is always introduced directly tangential to the wall (3). 2. Air blast device according to Fig. 1 and 2 and according to claim 1, characterized in that the suddenly expanding air between the wall (3) and the stored bulk material is initiated1 that the wall yield point is decisively reduced. 3. Air blow device, especially as shown in Fig. 2, with blow-out unit (1) and expansion guide nozzle (2) according to claims 1 and 2, characterized in that the expansion nozzle (2) designed and attached to the wall (3) is that with suddenly expanding air there is practically no significant moment in the wall (3) or in the rotating device (4) and / or in the mounting plate (5) is initiated. 4. Air blast device according to claims 1, 2 and 3, in particular according to Fig. 5, characterized in that the expansion nozzle (2) basically so is rotatably arranged that an approximately kréis-shaped surface of the bunker or silo inner wall can be coated with suddenly expanding compressed air.