RU64749U1 - INSTALLATION FOR DRYING POLYDISPERSIONAL BULK MATERIALS IN A CENTRIFUGAL PSEUDO-LIQUIDED LAYER - Google Patents

Abstract

Using. The utility model refers can be used in chemical, processing, food and other industries and agriculture. Essence. The design consists in the fact that in the central generatrix of the annular chamber there are filled windows, the height of which is equal to the height of the fluidized bed of material particles, the central generatrix of the annular chamber is made in the form of a truncated cone, and in the outer cylindrical generatrix of the housing there are filled slots for the dried material to exit the dryer.

Description

The utility model relates to devices for drying bulk materials using a centrifugal fluidized bed and can be used in chemical, food and other industries,

A known fluidized bed dryer [1], comprising a vertical casing, separated by gas distribution without gratings, supporting a layer of material on tiered ring chambers with a central generatrix in the form of a cone, communicating with each other by means of poured windows in the gratings and having a radical partition in each of them, moreover, the lower and upper chambers are connected respectively to the gas supply and gas exhaust ducts, in each chamber a second partition is installed that separates together with the first by the partition, the superlayer volume is divided into two sections, the gas supply and gas exhaust ducts are also divided by vertical partitions into two compartments corresponding to the sections of the chambers for autonomous inlet into and discharge of different-temperature gas from them.

Its disadvantage is the decrease in drying efficiency due to the formation of stagnant zones, uneven gas distribution and entrainment of individual particles from the fluidized bed zone, the residence time of particles in the annular chamber.

The utility model is aimed at increasing the drying efficiency of polydisperse materials by eliminating stagnant zones and entrainment of fine-grained material, increasing the compactness of the dryer.

This is achieved by the fact that in the central generatrix of the annular chamber there are filled windows, the height of which is equal to the height of the fluidized bed of material particles, the central generatrix of the annular chamber is made in the form of a truncated cone, and in the outer cylindrical generatrix of the housing there are filled slots for the outlet of the dried material from the dryer.

Figure 1 schematically shows a longitudinal section; figure 2 is a section aa; figure 3 is a longitudinal section of the guide vanes.

The dryer contains a cylindrical vertical housing 1, a gas-free annular gas distribution grill 2, with guide profile vanes 3, an annular chamber 4, overflow windows 5, a gas supply 6 and a gas discharge 7 duct, a loading cone 8 and discharge bins 9, a cone distributor 10, a gas flow stabilizer 11 pouring gaps 12.

The dryer operates as follows.

Hot air is supplied to the annular chamber 4 through the gas supply duct 6. The material to be dried continuously enters the feed cone 8 to the gas distribution grill 2 through the overflow windows 5. Under the influence of oblique jets of air formed by the profile blades 3, the material is fluidized and moves along the grill 2 along

spiral to the cylindrical generatrix of the housing 1 under the action of centrifugal forces arising from the movement of particles along a curved path, and output through the filling slots 12 from the dryer. The speed of the fluidizing agents after exiting the fluidized bed decreases to a value that is lower than the speed of the particles of the material being processed by increasing the cross-sectional area along the height of the annular chamber 4, which allows drying of particles of various sizes, eliminating entrainment of particles. The residence time of the material particles is controlled by the speed of the drying agent at the entrance to the fluidized bed or by increasing the width of the annular chamber depending on the type and size of the particles of the initial and final moisture content of the material.

The dried material is discharged through the discharge hoppers 9, and the coolant is discharged through a gas outlet box 7.

The proposed dryer is simple in design and allows to achieve high quality drying with intensive process control.

Source:

1. RF patent RU 2241928, IPC C27F26B 17/10 Publ. 12/10/2004. Bull. Number 34

Claims (1)

Installation for drying polydisperse bulk materials in a centrifugal fluidized bed, containing a vertical casing, a gas distribution gridless, supporting a layer of material, annular chambers with a central generatrix in the form of a cone, gas supply and gas discharge ducts, characterized in that in the central generatrix of the annular chamber there are filled windows, the height of which is equal to the height of the fluidized bed of material particles, the central generatrix of the annular chamber is made in the form of a truncated cone, and the output is dried Vai material and mixing is carried through slits formed in the outer cylindrical body generatrix.