SU1760271A1 - Drier - Google Patents

Abstract

Usage: for drying materials in various national entities. The essence of the invention: the drying contains a rotating drum with a sieve placed in it, made in the form of a cylinder consisting of rods reinforced on one side on a perforated flange, and on the other on a baffle, the annular partition, and the number of discharge pipes of the discharge device is one more than the number of sieves 2. 3 sludge.

Description

The invention relates to a drying chamber, in particular to drum dryers that use a heat and mass transfer method of drying, and can be used in various sectors of the national economy, for example, in the chemical, food industry, agro-industry, mechanical engineering, etc.

A known dryer comprising a rotating drum, a loading device with a material supply nozzle, a device for supplying a heat transfer fluid disposed on an end casing, an unloading device with an outlet nozzle, built in the opposite end casing and a drive for rotating the drum 1.

The disadvantages of this dryer include the limited functionality, the inability to sift the material into fractions

The closest to the technical essence is a dryer, containing a rotating drum with an equidistant screen placed in it, loading and unloading devices, pipes for supplying heat transfer fluid and removal of the vapor-gas mixture, and the Sieve stand eliminates large inclusions from the base material, besides special slotted air ducts provide uniform passage of the air mixture inside the bulk material ensuring its drying 2.

The disadvantage is the limited functionality of the inability to sift the material into fractions while simultaneously drying the material.

The purpose of the invention is an extension of the national capabilities.

This goal is achieved by the fact that the sieve is made in the form of a cylinder consisting of rods fixed on one side on a perforated flange placed on the drum end on the side of the feed funnel, and on the other on the baffle ring wall. fixed on the perforated flange may be several, the bars of each sieve from the discharge side are fixed on individual

cl

xj CN O

Yu

Xj

annular breaker baffles providing free output of the separated fractions of the material without mixing them through the discharge nozzles, while the number of the discharge nozzles of the discharge device is one more than the number of sieves. The material being dried enters through the material supply nozzle into the conical feed hopper, and from it into the sieve, made of rods, the diametrical pitch between the rods is selected, which fraction of the material must be separated from litter and fines. Soil and fines fall between the rods. The movement of the separated coarse fraction occurs due to the tilt of the drum. The heat carrier, for example, heated air flows directionally through a perforated flange between the rods to the screened coarse material in the internal cavity of the sieve, which, rolling over the rods, is intensively blown from all sides by coolant and dried in a shorter period than in the prototype.

In case it is necessary to separate several fractions from each other, prepare a dryer with several equidistantly arranged screens fixed to a perforated flange. In this case, each fraction is in the internal volume of its sieve and is intensively blown by coolant. Unloading of each fraction is carried out along a separate branch pipe, and their mixing is prevented by baffle annular partitions.

Thus, the proposed device provides enhanced functionality: sifting material into fractions while drying according to the principle of heat and mass transfer.

H Figure 1 shows a general view of the dryer (eg the "th -th cut"); Figures 2 and 3 are variants of BE r eni with several sieves.

. V ka contains: driven rotary, s., Aban 1, cylindrical sieve 2, loading device with material supply nozzle 3, device for supplying heat transfer fluid 4 placed on the end casing 5, discharging device with discharge nozzles 6 and 7 and fittings removal of gas-vapor mixture 8 installed on the end casing 9.

The cylindrical sieve 2 is composed of a conical feed funnel 10, arranged racks 11 and rods 12, which are fixed to a perforated flange 13 with a certain diametrical pitch corresponding to a specific fraction of the material. Fastening the rods to the flange and

the spacers provide a certain amount of clearance C between the screen and the inner surface of the drum 1, which is necessary for the collection of fines and debris.

To conical feed hopper 13 with

the inside of the drum is fixed to the socket 14, which prevents clogging of the perforation with a dropping trifle. The perforation in the flange 13 is made to ensure that the coolant is introduced into the gap C.

Several sieves (15 and 16) can be mounted inside the drum mounted on a perforated flange 13, which provide for sieving the material into several fractions, for example, for potatoes into small, medium and large (see Figures 2 and 3). the sieve 5 is made with the maximum diametral pitch between the rods, for a large fraction

0 material (large potatoes), 16 sieve in a reduced step for the average fraction of the material (medium potato).

The rods between the two sieves through the hoops are secured with racks 11 and 17 to

5vthe inner surface of the drum and with the help of racks 18 between them.

To prevent mixing of the separated fractions of the material with each other, fender rings 19 and 20 are fixed at the ends of the sieves, they also serve for the directional movement of the heat transfer medium, restrain its free flow into the steam-gas outlet fitting 8. In the lower part of the end casing 9, the following branch pipes 21 are made for the coarse fraction, 22 for the middle section and 23 for the small fraction and sludge.

The operation of the dryer is as follows.

0 The burner device 4 is ignited,

if it is, or is adjusted, a specific flow of coolant provides drying of the material being processed. The dryer is heated for some time with the drive of the drum 1 turned on. After a certain temperature inside the dryer is reached, the material is fed through the nozzle of the loading device 3 at a certain feed rate to

0 depending on the drying mode. The material gets into the conical funnel 10, and then onto the rods of sieve 2 (sieve 15), part of it is sifted to sieve 16 and then the small part itself falls on the inner surface of bar5 ban 1. During sieving, forced blowing of pieces of material ng different levels of coolant is performed which is supplied from device 4 through a perforated flange into the gap C. The greatest intensity of the blowing is carried out to the material located on the rods of both sieves 15 and 16, the smallest to the fines and sludge located on the inner surface of the drum. 1, which is very important in terms of saving the consumption of heat agent.

The drying mode is provided by a certain inclination of the drum (angle 2), which creates a certain speed of movement of the material through the drum dryer, the speed of rotation of the drum (p 15 rpm, and 0 °), the amount of material supplied through the loading device 3, the mode of coolant supply. The sifted and dried material enters the discharge device made in the end casing 9. Each fraction enters through its outlet nipple 6 and 7 or 21, 22 and 23 on its delivery conveyor or in its container.

The use of the proposed dryer will allow:

- to expand the functionality; drying the material simultaneously with the sieving (each fraction

dried separately at different levels, i.e. sitah);

 to intensify heat and mass transfer, due to the improved contact of the heat transfer medium with the material being processed, more complete utilization of the working volume inside the drum.

Claims (1)

Claims of the Invention Dryer containing a rotating drum with an equidistant screen placed in it, loading and unloading devices, pipes for supplying heat carriers and removing the vapor-gas mixture and the rack, characterized in that, in order to expand its functionality, it additionally contains a loading funnel, The sieve can be at least one and made in the form of a cylinder consisting of rods fastened on one side on a perforated flange, placed on the drum end on the loading side of the thief. Onks, on the other hand, are on the baffle annular partition, and the number of discharge pipes of the discharge device is one more than the number of sieves. 4,777. FIG. one / / 2 Editor KG Sokolov, Compiled by M.Rozhkov Tehred M. Morgental 23 JLJ & V VSvb, .-.: .-,.,; , -, -,; .- .. Fig.Z Proofreader M.Tkach