SU1204247A1 - Fall-through sectioning grid for apparatus provided with fluidized bed - Google Patents

Description

The invention relates to processes in the fluidized bed of a petroleum refining, petrochemical, and other industries where fluidized powder or microspherical product apparatuses are used.

The aim of the invention is to improve the homogeneity of the fluidized bed, reduce the entrainment of the fluidized product and reduce the hydraulic resistance of the lattice.

To achieve the goal, the dip sectional lattice is made of several horizontal rows of inclined plates. At the apex of the angle between the adjacent plates of each row, it has gaps that prevent the formation of reverse gas flows, and the gaps of the underlying row are located opposite the plates, which eliminates the possibility of leakage of gas puzzles without their destruction.

Fig, 1 shows a lattice, top view; in fig. 2 shows section A-A in FIG. one.

Each lattice section is made of several rows of inclined plates 1 fixed by welding along the ends to frame 2. When assembling the grill for better gas distribution and catalyst mixing, the lattice sections are angled 60-90 to each other.

The lattice works as follows.

The gas is blown through the product bed, the latter is fluidized, forming a superlattice dense and sublattice diluted layers. Frequent gas bubbles formed in the fluidized bed when they strike the surface of the inclined plates 1

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VNIIPI Order 8456/6 Circulation 540 Subscription Branch ShSh Patent, Uzhgorod, Projecto st., 4

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the lower row of the lattice is destroyed, and the other part of the puzzles that slip through the slots of the lower row is either destroyed or reduced in size, hitting the surface of the plates of the upper row of the lattice. The inclined plates of the upper row, being at the same time a barrier for gas flow, reduce catalyst carryover from the bed. Reducing the size of the bubbles and the release of the product into the over-bed space leads to an improvement in the homogeneity of the fluidized bed. The presence of slots at the apex of the angle formed by the inclined plates of the upper and lower rows of the lattice excludes the reverse currents of the gas, and consequently, the longitudinal mixing of the gas and the hydraulic resistance of the lattice are reduced.

The geometrical characteristics of the lattice, such as the width of the slots and plates, the distance between the rows of plates of one section and the angle between 1 points in each case, have certain values depending on the fluidization regime, the properties of the gas and the fluidized product.

The use of the proposed lattice improves the homogeneity of the fluidized bed and reduces the entrainment of the fluidized product.

The angle between adjacent plates of the row is maintained between 80-90 °. At an angle of more than 90 °, there is a stagnation of the catalyst on the surface of the plates, at an angle of less than –60 °, the emergence of through channels is possible, slippage without destruction and entrainment of the fluidized product, since the plates lose the function of the striker.

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Claims (2)

1. Failing SECTIONAL GRILLE FOR DEVICES WITH PSEUDO- I ’* II h Fig! LIQUID LAYER, including inclined plates, forming slots between them and arranged in rows along the height of the apparatus, characterized in that, in order to increase work efficiency by improving the homogeneity of the fluidized bed and reduce the hydraulic resistance of the lattice, the slots of the upper row are placed against the inclined plates of the lower row . 2. Grill pop. 1, characterized in that the plates in each row are mounted at an angle of 60-90 to one another.