SU1753219A1 - Shaft-type cooler of pelletized material - Google Patents

Abstract

Usage: in the cooling technology of granular materials. SUMMARY OF THE INVENTION: In the mine cooler 1, the granules after the press And containing two shafts with an exhaust device 19, there is additionally a filter 3 with its air duct 9, the walls of the shafts in height are combined, consisting of 3/4-2 / 3 louvers 12 or grids 13, and in the upper part of grids 13 or louvers 12, respectively, the central air chamber is divided by flap 7 into two parts — the upper one connected to the cyclone 2 and the lower one connected to the filter 3, in the cooling cavity there are movable guides plates, ochlenennye connecting rods with You are a final year at device 19, side cooling chamber are separated by a partition 20 into two parts - an upper and a lower 2-yl. (L S x | SJ GJ Yu

Description

rff / noibiu product

This invention relates to a technology for cooling granular materials in mine-type installations produced on rotary-ring presses using steam, which is a plasticizer for the granulation process. The device can be used in the grain processing industry and other branches of the agro-industrial complex when cooling granulated animal feed, bran, grass meal, flour slides, pulp and other materials made using steam or subjected to post-aging steam treatment.

A device for cooling granulated materials is known, which includes a shaft-type cooler, a cyclone and a fan (see Installation equipment for pelletizing DG brand feeds. Passport DG.PS. - Rostov-on-Don, 1979. - p. 47) used to cool not only compound feeds, but also other materials. The cooler in this case is a DG-P shaft column with two cooling cavities limited by end walls, one of which is made in the form of a blind over the entire height, and the opposite one is a grid over the entire height.

The disadvantage of this mine cooler of granular materials (mixed feed) is that the exhaust air is sent to the cyclone for cleaning through a hole made in the lower part of the air chamber, which occupies 1/3 of its height. At the same time, the speed of the exhaust air in the outlet section of the cooler at its standard flow rate is 16.0,., 16.5 m / s, which leads to the removal of significant amounts of valuable feed products in the form of cooling chambers into the central air chamber and further into the cyclone. dust and ungranulated part of the product, which are not completely trapped in a single cyclone, since its average purification rate is only 90% (see Volodin NP, Kastorny MG, Krivoshey AI Reference book on aspiration and pneumatic conveying installations - M .: Kolos, 1984, p. 18), and an elusive portion of dust is emitted into the atmosphere, polluting the environment and leading to the loss of valuable feedstuffs. In addition, the exhaust air is saturated with moisture, and this leads to the fact that the dust, which is removed from the cooling chambers of the device, smears the sieve walls of the cooler, is deposited and accumulates on the inner surfaces of the duct and

cyclone, worsening the aerodynamic regime - the work of the cooler and reducing the efficiency of dust cleaning.

The closest to the claimed technical solution (prototype) is a device consisting of a shaft cooler, a cyclone and a fan, which is almost completely consistent with the analogue, except that the material is cooled according to an improved technology, i.e. Exhaust air is discharged through two openings in the upper part of the cooler. At the same time, the air movement in the cooling body is changed to the opposite, and the louvre and mesh walls are interchanged in places 1.

The use of advanced technology has reduced the air velocity in the outlet section of the cooler to

0 6.0 ... 6.6 m / s and reduce the amount of dust and the ungranulated part of the product, carry 1 into the cyclone dust collector together with the exhaust air and slightly reduce the amount of dust emitted into the atmosphere. However, this mine cooler of granular materials (prototype) has the same disadvantages as the analog, i.e. Together with the exhaust air, a significant amount of dust is removed from the cooling zone to aspiration and is emitted into the atmosphere after cleaning in a cyclone-dust collector, leading to loss of valuable feedstuffs and pollution of the atmosphere.

5 In the technology of cooling granular materials produced using steam or subjected to post-press steam treatment, no fabric bag filters are used, since

0 they quickly stick with moistened dust, cakes form on the filter cloth and the filters do not fulfill their function.

The aim of the invention is to reduce

5 pylones This helps reduce the amount of pollutant emissions into the atmosphere and reduce the loss of valuable feed products.

The goal is achieved by the mine cooler of granular materials containing two mines with an exhaust device in the lower part and with mesh and louvered walls and a central air distribution chamber located between the shafts with a rotary valve dividing it into upper and lower parts and lateral air chambers, as well as an exhaust air exhaust duct connected to a cyclone, inlet nozzles and coolant outlet nozzles, additionally contain a filter with its air duct equipped with a valve, and t mines, the walls of the shafts in height are made combined, consisting of 3/4-2 / 3 in the lower part of the louver or grid, and in the upper part of the grid or louver with a transition section between them, the side air chambers are additionally divided into the upper and the lower inclined partition, one of the inlet pipes of the heating medium is connected to the upper part of the central air distribution chamber, and the other two - to the lower side chambers, the outlet pipes of the heat carrier are connected to the upper side chambers communicated with the cyclone and parts of the central chamber, the latter of which is designed as a confuser and connected to the filter by means of its duct, is installed in the central chamber at a height of 3/4-2 / 3 from the exhaust device, at the level of the transition section, in each of the mines are additionally installed at least two movable guide plates with an inclination of 0 to 45 ° from the angle of inclination to the vertical, elevated one relative to the other and communicated by means of a pull-out device.

The side air chambers are separated by an inclined partition at a height corresponding to the height of the flap in the central air chamber. In their lower part (on the side surfaces of the cooler), additional inlets are made for the entry of cooling air.

The proposed device differs from the prototype in that it additionally contains a filter with its air duct, fitted with a valve, and the plugs, the walls of the mines in height, are combined, consisting of 3 / 4-2 / 3 in the lower part of a blind or mesh, and in the upper part, respectively, of a grid or louver with a transition section between them, the side air chambers are additionally divided into upper and lower sloping partitions; one of the heating system inlet pipes is connected to the upper part of the central air distribution chamber, the other two are connected to the lower side chambers, the outlet pipes of heat transfer media are connected to the upper side chambers in communication with the cyclone, and to the lower part of the central chamber, the last of which is designed as a confuser and connected to the filter through its air duct; at a height of 3 / 4-2 / 3 from the exhaust device, at the level of the transition section, at least two movable guide plates with an adjustable angle from 0 ° to 45 ° to the vertical are installed in each of the shafts, height displaced one relative to another and communicated by means of t g with the exhaust device. Making the end walls of the height combined (at the bottom of 3 / 4-2 / 3 of the height of the grid or blinds and vice versa with a transitional area between them) caused by the need to drain from the cooler at the initial moment of cooling the exhaust air having a high moisture content and directing it to clean in cyclone. Between the upper outer part of the screen walls and the lower outer part of the louver there is a transition section (gap) for dust carried away by the exhaust air and returning it along the inclined partition (in case of deposition on it) into the granule layer. Dust and impermeable material particles in the cooling pits in the space between the granules, under the action of air blown through the material layer, move from the central and peripheral layers (from the louvre wall area) to the grid, i.e. exhaust air outlet. Upon further cooling of the facet (lower part), the direction of air movement in the layer is reversed and the exhaust air from the central chamber through the confuser is directed through the duct with the valve to the filter for cleaning. Since moisture (steam) is removed from the granules at the initial cooling moment, low moisture content is removed from the bottom of the cooler, at which the filter fabric of the additional filter is not moistened - and the air is cleaned from dust in the filter under normal conditions x, and the residual dust content of the air emitted into the atmosphere does not exceed 2 .26 mg / m3 of air (depending on the type of filter and the type of filter cloth).

Placing the flap, which can be either pivotal or in the form of a gate in the air chamber at a height of 3/4-2 / 3 from its base, corresponding to the transition of the end walls from the louver to the grid and vice versa, due to the need to divide the central air chamber into two parts - upper and lower when the mine cooler granular materials in the stationary mode. At the initial moment of time, when only the mines of the cooler are filled with granules, the flap opens, combines the upper and lower parts of the central air chamber into a common one, while the valve on the duct connecting the cooler with the filter is closed and the exhaust air enters only the cyclone. After the cooler mines are completely filled with granules, the flap closes the central air chamber and divides it into two parts - upper and lower, opens the valve on the air duct connecting the cooler with the filter, and the stationary cooling mode of the granules begins, and the exhaust air comes out through two pipes in the upper part &; "The cooler allows to reduce its speed to 2.1 m / s with a standard air flow rate in the device.

Making the outlet in the lower part of the central air chamber of the cooler follows its height, unlike its counterpart, where this hole constitutes about 1/3 of the entire height of the chamber, reduces the air velocity in the outlet to 5.4 m / s and the exhaust air through two nozzles in the upper part of the cooler allows reducing its speed to 2.1 m / s with a standard air flow in the device.

Thus, the presence in the claimed technical solution of distinctive features (additional equipment of the device with a filter with its air duct, equipped with a valve, and drafts, making the walls of the mines along the height combined, consisting of 3 / 4-2 / 3 in the lower part of their blinds or grids, and in the upper part, respectively, of a grid or louver with a transitional area between them, additional separation of the side air chambers into the upper and lower sloping walls, connecting one of the heat transfer pipes to the upper part The central air distribution chamber, and the other two to the lower side chambers, connect the heat transfer nozzles to the upper side chambers communicated with the cyclone and to the lower part of the central chamber, the latter of which is in the form of a confuser and connecting it to the filter through its air duct; dampers in the central chamber at a height of 3 / 4-2 / 3 from the outlet, at the level of the transition section, additional installation in each of the mines at least two movable guide layers an inclination with an adjustable angle of 0 to 45 ° to the vertical, offset in height relative to each other and communicated by tapping with the discharge device), allows to reduce dust emission by reducing

air velocity in the output sections of the shah. granular materials cooler.

The partitions dividing the side air chambers into two parts are inclined at an angle of 60 ° to the horizontal so that the dust that is carried by the exhaust air and partially can settle in the upper outlets is able to descend and return to the bed of granules through the transition section (gaps between external sieve and louvered walls).

Specified distinguishing features

5, the device claimed is not in their entirety in the known technical solutions and, when used, makes it possible to reduce dust emission. This reduces the amount of emissions of pollutants into the atmosphere, as well as reduces the loss of valuable feed products.

Figure 1 shows schematically a general view of a device for cooling granular materials, which contains a quench cooler 1, a cyclone 2, a filter 3, a fan 4, nozzles 5 for the heat carrier in the upper part of the side chambers of the cooler 1, an output confuser 6 in the lower part of the central chamber cooler 1, damper

0 7, dividing the central air chamber into two parts - upper and lower, valve 8 at the air duct 9 connecting cooler 1 with filter 3, inlets 10 in the lower side and inlet 11 11 in the upper part of cooler 1.

FIG. 2 schematically shows a cooler 1, which contains louvre 12 and mesh 13 walls of the mines, forming the central air chamber of the lower part

0 14, the upper part 15 and the shafts 16, the movable guide plates 17 communicated by the rods 18 with the exhaust device 19 (one bar is shown in Fig. 2, the others are not shown), and the inclined partitions 20 two parts - upper and lower.

The injected mine cooler of granular materials works as follows.

0 Hot granules after the press (or after steam treatment) with a temperature of 50 ... 80 ° C and more enter the cooling chambers of the chiller 1. At the initial moment of the cooling process (at

5 incomplete filling of the cooling pits 16 with granules) the flap 7 in the central air chamber is open, which allows to combine the lower 14 and upper 15 parts into one common central air chamber, and the valve 8 on the air duct 9 connecting the lower part of the central air chamber with filter 3, closed and all the spent coolant flows from the side chambers through two outlet pipes 5 in the upper part of the cooler f through the duct into the cyclone 2 for cleaning. In this case, the movable guide plates 17 are located at an angle of 45 ° to the vertical plane, since the discharge device does not work during this (initial) period of time. After the cooling pits 16 are completely filled with granulated material, the flap 7 closes and thereby divides the central air chamber into two parts, the lower 14 and the upper 15, and the valve 8 opens at the air duct 9, connecting the lower part 14 of the central air chamber with filter 3. In this way , the stationary mode of operation of the mine cooler of granular materials occurs, during which continuous filling of the cooling pits 16 with granules and their discrete discharge through the discharge device 19 occurs. When filling hopper 1 above the cooler up to a certain upper layer is switched on the discharge device 19 and starts the release of cooled material. When a layer of granules 18 is discharged, the articulating movable guide plates 17 with the discharge devices 19 are set in motion and the guide plates 17 under their action are lowered from the occupied position corresponding to 45 ° to the vertical plane to the position 0 ° to the vertical , shutting off the blinds and grids on the border of the transition section, t, e of two zones of the air chamber, and preventing the possibility of transfer of exhaust air with high moisture content from the upper part of the cooling chambers to the lower and further to the lower part of the central air The chamber and filter 3. When the exhaust device 19 returns to its original position, in which the pellets do not discharge, the guide plates 17 take up their original position (45 ° to the vertical plane) and, in this case, together with the layer of granules, prevent the passage of waste air with high moisture content from the upper part of cooling pits 16 to the lower part 14 of the central air chamber. When moving, the moving guide plates 17 loosen a layer of granules, which intensifies their cooling process. waiting

In the case of a stationary cooling process, at the initial moment of time, the cooling air flows through the inlet 11, while from the hot granules to

the process of passing air through their layer removes moisture (steam). Together with the spent saturated air, a layer of material is carried out of the layer of material.

is released from air as a result of its purification in a cyclone 2, and is partially emitted into the atmosphere. In the process of production of granulated material from the cooler 1 granules from the top of two cooling

0 of the shafts 16, several already dried (without steam) and partially cooled down into the lower part. Air entering the lower part of the cooling shafts 16 through the inlet holes 10 in the lower side part of the cooler passes from the side air chambers through the louvre walls 12, a layer of cooled material, mesh walls 13, in the form of waste enters the central air chamber,

0 through the outlet and the confuser 6 from the cooler 1 and is further directed through the duct 9 into the filter 3 for cleaning, after which it enters the fan 4. Dust removed from the exhaust air to the upper outlet nozzles 5 can settle on the inclined partition wall 20 and go through it into the layer of granules through the transition section (the gap between the outer sieve 13 and the outer pallet 12 wall). Wherein

For example, the inlet pit cooler of granulated materials can have one common ventilator or two for the upper and lower parts, i.e., after the cyclone 2, air can flow to one fan, and along 5 filter 3 to the other.

Compared with the prototype, the claimed pit cooler of granular materials has the following advantages: it allows to reduce dust removal and

0 thereby reducing the amount of emissions of pollutants into the atmosphere and reducing the loss of valuable feed products due to its additional equipping with filter 3, making 1 walls in the cooler

5 combined - from the louver 12 and the grid 13 and vice versa, making in the upper part 15 of the central air chamber an additional inlet 11 for the entry of cooling air,

0 connecting the two upper outlet pipes 5 with a duct to the cyclone 2, making an opening (confuser) 6 over its entire height in the lower part 14 of the central air chamber 6 and connecting it with an air 5 with water 9 having a valve 8, with an additional filter 3, placed in each cooling shaft 16 movable guide plates 17 articulated by rods 18 with a cooler exhaust device 19, having in its lower part on

side surfaces are additional inlet openings 10 for admission of cooling air, for separating the side air chambers by inclined partitions 20 into two parts — upper and lower, thereby ensuring separate cleaning of the air released from the cooler from dust — exhaust air with high water content — in the cyclone and exhaust air with low moisture content in the filter. This allows to reduce the dust emission and thereby reduce the amount of harmful emissions into the atmosphere after the filter to 2 ... 20 mg / m3 of air, depending on the type of filter and the type of filter cloth and, moreover, to reduce the loss of valuable feedstuffs.

Claims (1)

Formula of Invention Mine cooler of granulated materials containing two mines with an exhaust device in the lower part with mesh and wall panels and a central air distribution chamber located between the mines with a rotary valve dividing it into upper and lower parts, and side air chambers, as well as the air duct of the outlet the exhaust air connected to the cyclone, the inlet nozzles and the outlet nozzles of the coolant, characterized by the fact that reduce dust removal, it additionally contains a filter with its air duct, fitted with a valve, and the plugs, the walls of the mines in height, are combined, 3 / 4-2 / 3 in the lower part of the louver or net, and in the upper part of the net or louver with a transition section between them, the side air chambers are additionally divided into upper and lower sloping walls, one of the nozzles the coolant is connected to the upper part of the central air distribution chamber, and the other two - to the lower side chambers, heat transfer nozzles are connected to the upper side chambers in communication with the cyclone, and to the lower part of the central chamber, the last of the nozzles is designed as a confueor and under the hood to the filter through its duct, the rotary valve in the central chamber is set at a height of 3 / 4-2/3 from the exhaust device at the level of the transition section, in each of the mines at least two movable guide plates with an adjustable angle from 0 to 45 ° to the vertical are installed, displaced in height one about relative to another and communicated by means of t g with an outlet device. BUT nineteen