JPS642156Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention is a fluidized bed device that fluidizes powder and granular material filled in a container by the inflow of gas, which is discharged toward a regenerator or the like. The present invention relates to a device that prevents large lumps from being mixed into powder or granular materials.

[Prior art]

When a container is filled with powder and granular material and a gas is introduced through a perforated plate or other flow straightener, the particle layer remains stationary while the flow rate is low, but as the flow rate increases, the particle group's movement becomes more active and eventually the liquid begins to flow as if it were boiling. An apparatus that creates this state is called a fluidized bed apparatus, and fluidized bed apparatuses that fluidize granular catalysts are widely used in various chemical equipment such as reactors.

In this type of fluidized bed equipment, the deteriorated catalyst is guided to a regenerator to be regenerated, and the deteriorated catalyst generally falls from the discharge port into a conveying pipe called a downcomer and is regenerated inside the downcomer. Transported to the device. However, the conventional fluidized bed apparatus has the disadvantage that large lumps may get mixed into the downcomer, clogging the downcomer and hindering conveyance.

[Summary of the idea]

The present invention was developed in view of the above points, and is formed between the upward opening edge of the discharge pipe that opens in the fluidized bed and the lid body supported on this edge by a support body. In a cylindrical opening to the side, a plurality of wedge-shaped classification bodies are arranged side by side, with the opening side having the same width on the top and bottom, and the outer end side becoming narrower toward the bottom end. By configuring the system so that the particles flow into the discharge pipe through the gaps between adjacent classified bodies, and the large lumps larger than a predetermined particle size fall out of the discharge pipe along the classified bodies, large lumps are mixed into the discharge pipe and discharged. The present invention provides a device for preventing large lumps from being mixed in at the discharge port of a fluidized bed apparatus, which eliminates the clogging of the discharge pipe caused by the clogging of the discharge pipe. Embodiments of the present invention will be described in detail below with reference to the drawings.

[Example] Figures 1 to 4 show an example of the large lump contamination prevention device according to the present invention. FIG. 3 is an enlarged front view of the upper end, a front view and a plan view of the classification body, and FIG. 4 is a perspective view. In the figure,
A catalyst 4 is stored on a grid 3 provided in a closed tank 2 of the fluidized bed apparatus 1, and a gas inlet 5 is opened at the lower end of the tank 2. Reference numeral 6 denotes a downcomer as a discharge pipe connected to the regenerating device 7, which is inserted above the lattice 3 in the tank 2, and the upper end discharge port is filled with large lumps mixed in as shown in an enlarged view in Fig. 2. A prevention device 8 is provided. That is, a support body 9 is erected by welding at a location that divides the discharge port edge 6a of the downcomer 6 into three equal parts in the circumferential direction, and a lid body 10 formed under the support body 9 is erected by welding.
It is supported by welding to the upper end of the support body 9, and a support ring 10a formed in an annular shape having the same diameter as the discharge port of the downcomer 6 is integrally formed inside the lower end of the lid body 10. By doing this, the support ring 10
A cylindrical space is opened laterally between the outlet edge 6a and the outlet edge 6a, and a plurality of slitters 11 as classifiers are installed in this opening with support rings 10a at both upper and lower ends. and the outlet edge 6a, and are arranged in parallel at predetermined equal intervals. In addition, in FIG. 2, only two of these slitters 11 are shown, and illustration of the remaining slitters 11 is omitted. The slit 11 has a substantially prismatic shape as a whole, and an inclined surface 11a is formed at the upper end thereof to be inserted into a space having a triangular cross section formed on the back side of the lower end of the lid body 10. In addition, when viewed from the front, the opening side is shaped like a strip, and the outer side, which is the front side, is formed into a wedge shape that becomes narrower toward the lower end. By doing this, the spacing between adjacent slits 11 is the same width from top to bottom on the opening side, but becomes larger on the outside as it goes toward the bottom end, as shown by symbols t ₁ and t ₂ in the figure. ing.
Although the maximum spacing t ₂ is shown large in the diagram, it is 2 to 3 mm in the example and varies depending on the particle size of the catalyst.
t ₁ and t ₂ are set.

In the fluidized bed apparatus configured as above,
When a catalyst 4 is filled on a grid 3 in a tank 2 and a gas is allowed to flow in from the gas inlet, the catalyst 4 becomes fluidized as the flow rate increases, and this fluidized catalyst 4 is used for chemical reactions, etc. It will be done. The deteriorated catalyst 4 is then conveyed inside the downcomer 6 to the regenerator 7 and regenerated. In this case, the catalyst 4 flows into the discharge port of the downcomer 6 from the gap between the adjacent slitters 11, but since the dimension t ₁ of this gap is set according to the particle diameter of the catalyst 4, the particle diameter t ₁ Only the following items flow into the downcomer 6. When the catalyst 4 having a particle size of t ₁ or more collides with the slitter 11 , it cannot pass through the gap t ₁ , so it falls along the wedge-shaped tapered surface of the slitter 11 that expands downward, and is returned into the tank 2 .

[Effect of idea]

As is clear from the above explanation, according to the present invention, in the fluidized bed apparatus, a discharge pipe is formed between the upwardly opening end of the discharge pipe that opens in the fluidized bed and the lid supported by the support on this end. By arranging in parallel a plurality of wedge-shaped classifying bodies in a cylindrical opening to the side where the opening is in the form of a strip with the same width on the top and bottom and the outer end becoming narrower toward the bottom. , only particles with a predetermined particle size or less flow into the discharge pipe through the gaps between adjacent classified bodies, and large particles with a predetermined particle size or more collide with the classified bodies and then spread downward without adhering to the slitter. Since the particles fall extremely smoothly along the tapered surface and are returned into the tank, they do not flow into the discharge pipe, completely preventing large particles from clogging the pipe, and reducing the transport of particles within the discharge pipe. It is carried out extremely smoothly.

[Brief explanation of the drawing]

1 to 4 show an embodiment of a device for preventing large lumps from being mixed in at the discharge port of a fluidized bed device according to the present invention, and FIG. 1 is a schematic configuration diagram of a fluidized bed device implementing this device, and FIG. 3 is an enlarged front view of the upper end of the discharge pipe, FIG. 3 is a front view and a plan view of the classifier, and FIG. 4 is a perspective view. DESCRIPTION OF SYMBOLS 1... Fluidized bed apparatus, 2... Tank, 4... Catalyst, 6... Downcomer, 6a... Discharge port edge, 8
...Large lump contamination prevention device, 9...Support, 10...
Lid body, 11...Suritsuta.

Claims (1)

[Scope of utility model registration request] A plurality of supports are made to protrude upward from the discharge port edge of a discharge pipe arranged in the fluidized bed with the discharge port facing upward to support the lid body, and between the discharge port edge and the lid body. A plurality of classified bodies each having a wedge-like shape with the opening side having the same width up and down and the outer end becoming narrower toward the lower end are inserted into the lateral cylindrical opening formed in the cylindrical opening. A large lump contamination prevention device at a discharge port of a fluidized bed device, characterized in that the devices are arranged in parallel at intervals.