SU1318774A1 - Fluidized bed apparatus - Google Patents

Abstract

The invention relates to the field of mechanical engineering and can be used for heat treatment of a working fluid, for example, in heat exchangers, chemical reactors, drying units and other devices. The purpose of the invention is to increase operational reliability. In a fluidized bed apparatus comprising a housing, a gas distribution grid 2, a fluidized bed of dispersed material 3, a horizontal failure wall 4, the dispersed material is placed under the latter, the product of the square of the effective average particle diameter of which is less than the square of the effective average particle diameter of the fluidized dispersed material on its density. 1 il. (About & About N4 00 4 Air) (

Description

The invention relates to mechanical engineering and can be used for heat treatment of a working medium, for example, in heat exchangers, chemical reactors, solar aggregates and other devices.

The purpose of the invention is to increase operational reliability.

The drawing shows a diagram of the fluidized bed apparatus for the heat treatment of the working fluid.

The apparatus 1 comprises a housing and a gas distribution grid 2, on which the backfilling of a disposable dispersible bed is located. 3. The apparatus is divided into sections by a horizontal collapsing partition 4, under which a device for supplying heat is located, for example a nozzle 5 for fuel supply, and under which are placed additional dispersed particles 6, in which the effective average diameter is greater than the effective diameter of the holes in the partition 4, and the speed of the onset of pseudo-salt and less than the speed of the onset of fluidization particles of fluidized bed of dispersed material 3. A heat exchanger 7 is installed above the partition 4 for supplying a working fluid, for example a heat carrier.

The presence of a movable layer of floating up additional dispersed particles under the horizontal collapsing partitioning wall increases the sub-partitioning component of the thermal resistance of the partition, which leads to a significant decrease in temperature at the lower boundary of the partition, which means that the apparatus operates reliably.

In order for the dispersed particles to occupy the upper part of the layer under the partition during operation, it is necessary that their effective average diameter be greater than the effective diameter of the holes in the partition and the ratio

, dlf2 rp (1)

where LeF WG, - respectively, the effective average diameter and density of additional dispersed particles; , p, - respectively, the effective average diameter and density of the particles of the bed of the fluidized dispersed material.

The fulfillment of relation (1) means that the rate of the onset of fluidization of additional dispersed particles, yes, will be less than the rate of onset of the fluidized particles of the bed of fluidized dispersed material

ША, m, 4j,,

which leads to the ascent of additional particles.

The device works as follows.

When gas is applied, such as air, under

gas distribution grid 2 backfill

fluidized particulate material 3

and additional dispersed particles b

5 are fluidized, and additional dispersed particles occupy the upper part of the layer under the partition 4 and cannot penetrate through it, forming a moving layer. The moving layer of additional dispersed particles, having a thermal resistance, reduces the temperature at the lower boundary of the partition 4.

Thus, the placement in the section under the partition of additional dispersed particles forming during fusion

5, a movable layer underneath it allows reducing the temperature at its lower boundary, which ensures reliable and uninterrupted operation of such a partition and the entire apparatus as a whole for a long time.

thirty

Claims (1)

Invention Formula Fluidized bed apparatus for heat treatment of the working fluid, comprising a housing, a gas distribution grid, a fluidized dispersed fluidized bed material, at least one horizontal failure wall, a device for supplying heat, located in the section under the partition, a device for supplying a fluidizing agent and a device for supplying the working fluid to the fluidized bed, characterized in that, in order to improve operational reliability, in the section under the partition dispersed material is placed, and the product of the square of the effective average diameter of its particles and their density is less than the product of the square of the effective average diameter of particles doozhizhaemogo particulate material on its density.