SU817456A1 - Gas distributing arrangement for multizone fluidised-bed apparatus - Google Patents

Description

holes in the lateral surface of the lattice are blocked by the material of the sublattice layer, i.e. A stable multi-zone apparatus has been achieved. The experiments were carried out in a laboratory setup representing

a cold model of a multi-zone apparatus with a fluidized bed of material with an internal diameter of 56 mm.

In tab. 1 shows the results of studies conducted in a laboratory setup.

Table 1

60.0 in the lower zone of multi-zone an, 0

,sixteen

40.0 Material is at the bottom level. knock down the side of the sieve 10, 0 The material is at the bottom, 32

0.51

1.60

1.61

The choice of the correlation of the cross-sectional area of the central opening of the grating 5c to the sulla of the ary cross-sectional area of the lateral openings of the lattice 2, and to the upper edge area of the grating 8, within the above limits is due to the need to maintain a steady uniform liquefaction of the sublattice & lattice with a given speed.

At 8 c. The dBD is less disturbed by the uniformity of the parata material, the material is kept at the level of the lower edge of the lattice. The bursts of material reach the lateral surface of the gratings. The side holes are covered with caps consisting of conglomerates of particles of material. Over time, they cover most of the side holes. Discharge of material through the central opening is terminated. he cut the pipe. Bursts of the board. The picture is repeated as in experiment 1, but for a longer period of time, it was cut off of the nozzle. The caps appear rarely and immediately get knocked down by the next bursts. Material satisfactorily flows from one zone to another.

The material is at the level of the lower edge of the nozzle, the material flows well from one zone

to another.

Also.

Material affliction, violation of uniformity of flow through the nozzle 4.. .

from one zone to another as a result of the crust of particles in the nozzle.

At Longer than 1.6, the homogeneity and stability of the fluidization of the material is disturbed and a so-called central boiling occurs, at which the side of the ainrjapat machine forms a ring of stationary material, which gradually compresses, and in the high-temperature process it is sintered. The choice of the limit in the ratio S ".,: KS S is made according to the results of experimental studies given in Table. 2

0.06

0.07

2.28 For stable operation of a multizone zone of a fluidized bed apparatus, it is necessary to remove from the bottom of the smaller base of the lattice to the bottom of the larger base of 0.0025 (Su, -. E-0.065. Table 3 shows the cooling characteristics material depending on the ratio Su, -Sp. Gas distribution device provides a uniform fluidization, material without sides

Table

Unloading of material from one zone to another is difficult due to the wreck of particles in the nozzle.

The liquefaction of the material is homogeneous, the discharge of material from one zone to another is free.

Same i i

 I "-"

The discharge of the material proceeds normally, the liquefaction is heterogeneous.

Unloading material is normal. A central boiling of the material was observed with the formation of a ring of a stationary material along the periphery of the lattice.

 The platelet of the lattice openings with a conglomerate of particles allows one to withstand a given level of the sublattice material layer and the uniform flow of material from one zone to another without partially cooling the material. The device allows for fast unloading of material at forced stops of a multi-zone apparatus with a fluid bed, preventing caking of the material and its sintering in high-temperature processes.

Claims (3)

Invention Formula 1, Gas distribution device for fluidized bed hip devices, containing a truncated cone with side holes, fixed in the side walls of the device using a support flange, characterized in that, for the purpose of stable operation of the device, it is provided with an extension & shms down a pipe fixed to the lower lower base of the re; an aunt whose length is 0.32: 1, 6 perimeter of the smaller base of the lattice 2. The device according to claim 1, which is based on the fact that the ratio the cross-sectional area of the smaller base of the lattice to the total cross-sectional area of the lateral openings of the lattice is approximately 0.071.6 3. The device according to claim 1, about tl, which is often so that the ratio of the cross-sectional area of the smaller lattice base to the cross-sectional area of its larger base is 0.0025-0.065. Sources of information taken into account in the examination .c1. U.S. Patent 3,370,361, Cl. 34 57, 1977.