RU53764U1 - INSTALLATION OF A BOILING LAYER FOR DRYING THERMOLABLE POLYDISPERSION BULK MATERIALS - Google Patents

Abstract

The invention relates to the drying of thermolabile bulk materials in an oscillating mode and can be used in chemical, processing, food and other industries and agriculture. The proposed dryer is simple in design and allows to achieve high quality drying in a fluidized state of polydisperse fine-grained materials. The dryer is characterized in that the supply of fresh drying agent and the exhaust is carried out in each tiered working chamber and the partitions separating the superlayer volume are located behind the bulk windows, and the central generatrix of the annular chambers is made in the form of a truncated cone.

Description

The utility model relates to devices for drying thermolabile bulk materials using a directionally moving fluidized bed in an oscillating mode and can be used in chemical, food and other industries.

Known fluidized bed dryer for thermolabile bulk materials, containing a vertical casing, separated by gas distribution gridless, supporting a layer of material on the belt-mounted annular chambers with a central cylindrical generatrix, communicating with each other by filling windows in the gratings and having a vertical partition in each of them, the lower and the upper chamber are connected respectively to the gas supply and gas outlet boxes, in each chamber a second a vertical partition, which divides the superlayer volume together with the first partition into two sections, the gas supply and exhaust ducts being also divided by vertical partitions into two compartments, corresponding to the sections of the chambers for autonomous supply of and diversion of different-temperature gas from them [1].

The drawback of the dryer is the reduction of the temperature difference between the drying agent and its moistening as the tiered annular chambers pass from bottom to top.

The utility model is aimed at increasing the drying efficiency of polydisperse materials by maintaining a constant temperature difference in the tiered chambers, eliminating stagnant zones and entrainment of fine-grained material and increasing the compactness of the dryer.

This is achieved by the fact that the lower compartments of the annular chambers are designed to supply a multi-temperature drying agent, and the upper ones are a working chamber for drying the material and removal of the spent drying agent.

Figure 1 shows the proposed dryer made in a perspective view with a complex section.

The dryer design is a cylindrical body 1, divided by a horizontal partition 2 into two different-temperature annular chambers. In the upper cover of the cylindrical body there is a loading hole 5 through which the wet polydisperse material is loaded. The device operates as follows, the material along the gutter enters the beginning of a gas-free gas distribution grid, separated by a partition 4 from

fill box. The material fed to the grate is fluidized and dried by passing through the annular chamber due to the directed flow of the drying agent supplied through the duct 7 into the chamber under the gas distribution grate 3 and through the overflow window 12 at the end of the cylindrical grate is poured into the other annular chamber. The spent drying agent through the pipe 9 is discharged from the chamber for cleaning.

The dried material, having got beyond the partition 4 onto the grate of the lower drying chamber, is again fluidized by the flow of a drying agent of a different temperature supplied through the duct 8. Passing along the grating of the lower chamber due to the directed flow of the drying agent, another part of the moisture is removed from the material. Then the material at the end of the grate through the overflow window 6 and the hopper is unloaded from the dryer. The spent drying agent of the lower chamber is also sent through the duct 10 for cleaning.

In the center of each drying chamber under the lattice for a directed air flow there is a cylinder 11, which passes into a cone in the superlattice, changing the cross section of the drying chamber, which contributes to less ablation of the dried material.

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

Source:

1. Patent A.S. RF №44804. Publ. 03/27/2005. Bull. Number 9

Claims (1)

The fluidized bed dryer for thermolabile polydisperse bulk materials, containing a vertical body, is divided by a horizontal partition into two working chambers, which in turn are divided by gas-distributing wireless gratings supporting a layer of material on half-spaced annular chambers with a central cylindrical generatrix in the gas compartment and a conical part in the working a chamber communicating with each other by means of overflow windows in gratings and having a partition in each of them, the lower and The upper chambers are individually connected respectively to a gas supply and gas outlet pipe, characterized in that the supply of fresh drying agent and exhaust is carried out in each tier-mounted working chamber, and the partitions separating the superlayer volume are located behind the bulk windows, equipped with a bulk material selector, and the central generatrix of the working part of the annular chambers is made in the form of a cone.