SU1333400A1 - Gas distributing plate - Google Patents

Abstract

The invention relates to the design of fluidized-bed chemical apparatus and makes it possible to increase the reliability of their operation. The gas distribution grid of the fluidized bed apparatus is provided with a support frame 1, made in the form of parallel rows of paired plates 2, connected by transverse end plates 5. Spacing sleeves (PB) 6 are clamped between the upper and lower plates 2, and the grate bars (K) are missed through PB 6 with a radial clearance allowing each unit K to be moved within PB 6 in four degrees of freedom. During the operation of the apparatus K laid with a radial gap inside the PB 6, they begin to vibrate and their self-treating occurs, which ensures a longer operation of the lattice, excluding sticking to the surface K of solid deposits. 6 Il. from 13 g 1 00 О5 СО 4 fig, 1

Description

The invention relates to chemical engineering and can be used in fluidized bed apparatus.

The purpose of the invention is to increase the reliability of operation, as well as to simplify the manufacture and maintenance of the apparatus.

FIG. 1 shows a grill mounted in the housing of a fluidized bed or foam apparatus, the general view of FIG. 2 shows a section A-A in FIG. in fig. 3 shows a section BB in FIG. 2; in fig. 4 — node I in FIG. one; FIG. 5 is a sectional view BB in FIG. 1j in FIG. 6 - grille mounted in the case of lined apparatus, general view.

The gas distribution grid of the fluidized bed or foam apparatus contains a rigid support frame 1 consisting of paired plates 2, assembled in parallel rows 3 and 4 and connected by two transverse end strips 5. In frame 1 there may be two or more parallel rows from paired plates depending on the diameter of the apparatus (only two rows are shown in Fig. 2).

Spacer sleeves 6 are clamped between the upper and lower plates with a certain pitch, which corresponds to the living cross-section of the brush required for operation. The sleeves 7 are passed through the sleeves 6, while there is a radial clearance between the outer diameter of the grate 7 and the inner diameter of the spacer 6, which allows each single grate to move within the spacer of the spacer; longitudinally, transversely in two planes — horizontal and vertical — and rotation around its axis. A frame 1 with grate 7 is laid on a support shelf 8 welded to the body 9 of the apparatus or made of lined material 10. From above the frame 1 is axled by a stop ring 11 welded to the body 12 of the apparatus or made of lined material. Flange connection 13 is provided for mounting and dismounting the grille.

The support frame 1 is assembled from paired plates 2, between which spacers 6 are placed with a definite pitch, the plates are placed 2 in parallel, and welded with transverse end strips 5. You are 0

five

0

five

0

five

0

five

0

five

the honeycomb of the transverse strips 5 is taken up by a few 1 cm (20-25) pain nie, than the distance between the upper and lower plates 2. This is done in order to lift the ends of the grate 7 above the supporting shelf 8 and eliminate the possible contact of the grate bars

7 regiments 8, which limit their lateral movement. Through the spacer sleeves 6, made of standard pipes and fixed on the plates 2 by welding, the grates 7, also made of standard pipes of a certain length, are passed, the ends of the KOTopbix are plugged. The grid in assembled form is installed on the support shelf 8 of the lower part 9 of the housing of the apparatus, after which the upper part 12 of the housing is installed. Last equipped with restrictive shelf

11, which is separated from the support ring 8 at a distance exceeding the height 1, so that with a possible linear expansion of the frame 1 from the effect of temperature, the lattice itself and the limiting support shelves do not deform

8 devices. After mounting the grille on the support shelf 8, the apparatus is assembled by tightening the flange connection 13 by installing a gasket material. In this form, the grille is ready for operation. The dismantling of the grille was performed in the reverse order.

The device works as follows.

The material processed in the fluidized bed or foam layer is fed to the grate, from below the gaseous agent is fed under the grate, with which the fluidized bed or foam layer is formed for the gas-solid or gas-liquid systems, respectively. During operation in these systems, in virtually any aero-hydrodynamic mode, hydraulic oscillations (shocks) occur due to the nature of these processes, due to which the grate 7, laid with a radial clearance inside the spacer sleeves 6, begin to vibrate. In this case, if the material being processed is prone to sticking to the surface of the grates 7 or if sediment is deposited from the liquid, which is also capable of deposition on the surfaces, then during the vibration of the grates their self-rubbing occurs. All this provides

more TipofloJmHTenbHvro continuous work of the rehear, contributing to a longer maintenance of it in the working state compared to the grate having grate fixed from moving in the transverse direction.

In addition, even if sticking to the surface of the grate 7 of solid deposits due to the rotation of the grate around its axis, these deposits are evenly distributed over the entire surface, slowly reducing the living section of the grid, which also prolongs its continuous operation.

The radial gap between the grate bars and the spacer sleeves with the maximum possible run-up of the neighboring grate 7 does not reflect in any way the uniformity of gas distribution and the stability of the fluidized bed or foam layer. In the same processes, where the magnitude of the linear velocity of the gas exceeds 3 m / s in the cross section of the apparatus, and also taking into account the possible density of reflux for gas systems

ten

c

2o

33400

liquid.

25

the observed non-uniformity of the gap width is completely unnoticeable due to the hydraulic backwater formed in the system, due to which the distribution and contact of the phases in the boiling or foam layers are ensured,

Claims (1)

Invention Formula The gas distribution grid of the fluidized bed apparatus containing a support and grate mounted in spacer sleeves with the possibility of longitudinal movement, characterized in that, in order to increase the reliability of operation of the apparatus, it is equipped with a support frame, designed in parallel paired plates connected by transverse end slats, inside of which there are grate bars placed inside the support sleeves with a radial clearance allowing them to transversely and rotate around its axis. n FIG. 2 Editor M. Petrov Compiled by L. Lazarenko Tehred L. Serdyukova Proofreader E. Roshko Order 3865/8 "Circulation 510 Subscription VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab, 4/5 Production polygraphic enterprise, Uzhgorod, st. Proektna, 4 fig.b