CN214181821U - Return air circulation mechanism of spray drying tank - Google Patents

Abstract

The utility model discloses a spray drying jar return air circulation mechanism relates to the mist processing field in the drying process of aluminium oxide solution, it includes spray drying jar, rose box and vacuum pump, spray drying jar's air-out end and the air intake connection of rose box, the air outlet of rose box is connected with the air inlet end of vacuum pump, the air-out end of vacuum pump is connected with spray drying jar's air inlet end, install a plurality of filter layers in the cavity of rose box, a plurality of filter layers form the filter chamber with the lateral wall of rose box, and the air outlet of rose box is seted up in the filter chamber. The utility model has the advantages that: after the mixed gas discharged from the spray drying tank is treated by the filter tank, high-temperature hot air and a vaporous alumina solution are subjected to multi-layer filtering layers in the filter tank, the gas in the mixed gas is conveyed to the air inlet end of the spray dryer for cyclic utilization by the vacuum pump after the mixed gas is subjected to layer-by-layer filtering treatment, and alumina solids blocked by the filtering layers are deposited at the lower end of the filter tank and collected.

Description

Return air circulation mechanism of spray drying tank

Technical Field

The utility model relates to a mist among the drying process of aluminium oxide solution handles the field, especially a spray drying jar return air circulation mechanism.

Background

In the production process of high-purity alumina, the alumina solution generated by a reaction kettle needs to be subjected to solid-liquid separation through a spray drying tank, hot air is introduced into the top of the drying tank, feed liquid is simultaneously conveyed to the top of the tank, atomized liquid drops are sprayed through an atomizer, the surface area of the liquid drop groups is large, water is rapidly evaporated after the liquid drop groups are contacted with high-temperature hot air, the liquid drops become dry products in a very short time, the temperature is remarkably reduced after the hot air discharged from the bottom of the drying tank is contacted with the liquid drops, the humidity is increased, the liquid-solid separation of the alumina is finally realized, the high-purity alumina is obtained through processes such as calcination and the like on the solid, and mixed gas generated by the drying tank.

However, the mixed gas discharged from the drying tank contains alumina solution and alumina powder carried by hot air, the mixed gas contains liquid and solid, and cannot be directly discharged.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to overcome prior art's shortcoming, provide a spray drying jar return air circulation mechanism.

The purpose of the utility model is realized through the following technical scheme: the utility model provides a spray drying jar return air circulation mechanism, includes spray drying jar, rose box and vacuum pump, the air-out end of spray drying jar and the air intake connection of rose box, the air outlet of rose box and the air inlet end of vacuum pump are connected, the air-out end of vacuum pump and spray drying jar's air inlet end are connected, install a plurality of filter layers in the cavity of rose box, a plurality of filter layers form the filter chamber with the lateral wall of rose box, and the air outlet of rose box is seted up in the filter chamber.

Preferably, the upper end of the filter box is cylindrical, the lower end of the filter box is conical, the filter layer is installed at the upper end of the filter box and comprises a first filter layer, a second filter layer and a third filter layer, the third filter layer is located on the inner side of the second filter layer, the second filter layer is located on the inner side of the first filter layer, a first filter cavity is formed in a gap between the first filter layer and the second filter layer, a second filter cavity is formed in a gap between the second filter layer and the third filter layer, a third filter cavity is formed in a gap between the third filter layer and the side wall of the filter box provided with the air outlet, and the air outlet is located in the third filter cavity.

Preferably, the first filter layer is an 80 gauge wire screen, the second filter layer is a 50 gauge wire screen, and the third filter layer is a 28 gauge wire screen.

Preferably, the side wall of the upper end of the filter box is also provided with an air inlet, and the air inlet is positioned on the side wall opposite to the air outlet.

Preferably, a discharging pipe is arranged at an outlet at the lower end of the filter box.

Preferably, the blanking pipe is provided with a regulating valve.

The utility model has the advantages of it is following: the utility model discloses a handle the back with spray drying jar exhaust mist via the rose box, with the hot-blast and vaporific aluminium oxide solution of high temperature via the multilayer filter layer in the rose box, filter the air inlet end cyclic utilization that handles the back with wherein via the vacuum pump layer one layer upon layer, the aluminium oxide solid that is blockked by the filter layer is then the deposit is collected at the rose box lower extreme.

Drawings

Fig. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic top view of a filtration tank;

in the figure, 1-a spray drying tank, 2-a filter box, 21-an air inlet, 22-a first filter layer, 23-a second filter layer, 24-a third filter layer, 25-an air outlet, 26-a blanking pipe, 27-an adjusting valve, 3-a vacuum pump, 4-a first filter cavity and 5-a second filter cavity.

Detailed Description

To make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the drawings of the embodiments of the present invention are combined to clearly and completely describe the technical solutions of the embodiments of the present invention, and obviously, the described embodiments are some embodiments of the present invention, not all embodiments. The components of embodiments of the present invention, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

In the present invention, the embodiments and the features of the embodiments may be combined with each other without conflict.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate the position or positional relationship based on the position or positional relationship shown in the drawings, or the position or positional relationship which the products of the present invention are conventionally placed in use, or the position or positional relationship which the skilled person conventionally understand, and are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the device or element to which the reference is made must have a specific position, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used merely to distinguish one description from another, and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In this embodiment, as shown in fig. 1, a return air circulation mechanism of a spray drying tank includes a spray drying tank 1, a filter box 2 and a vacuum pump 3, an air outlet end of the spray drying tank 1 is connected with an air inlet 21 of the filter box 2, an air outlet 25 of the filter box 2 is connected with an air inlet end of the vacuum pump 3, an air outlet end of the vacuum pump 3 is connected with an air inlet end of the spray drying tank 1, a plurality of filter layers are installed in a cavity of the filter box 2, the filter layers form a filter cavity with a side wall of the filter box 2, and the air outlet 25 is opened in the filter cavity, so that when mixed gas in the filter box 2 exits from the air outlet 25, the mixed gas discharged from the spray drying tank must be filtered by the filter layers, the mixed gas enters the filter box 2 via the air inlet 21, high-temperature hot air and mist-shaped alumina solution pass through the filter layers in the filter box 2, and after being filtered layer by layer, the gas in the mixed gas is conveyed to the air inlet end of the spray drying tank 1 via the vacuum pump 3 for circulation In use, alumina solids that are retained by the filter layer are deposited at the lower end of the filter box and can be collected.

In this embodiment, as shown in fig. 1 and fig. 2, the upper end of the filter box 2 is cylindrical, the lower end is conical, the upper end of the filter box 2 is provided with a plurality of filter layers 20, each filter layer 20 includes a first filter layer 22, a second filter layer 23 and a third filter layer 24, the third filter layer 24 is located on the inner side of the second filter layer 23, the second filter layer 23 is located on the inner side of the first filter layer 22, a gap between the first filter layer 22 and the second filter layer 23 forms a first filter chamber 4, a gap between the second filter layer 23 and the third filter layer 24 forms a second filter chamber 5, a gap between the third filter layer 24 and the sidewall of the filter box 2 provided with the air outlet 25 forms a third filter chamber 28, and the air outlet 25 is located in the third filter chamber 28.

In this embodiment, as shown in fig. 1 and fig. 2, it is concluded from long-term practical experience that the diameter of dust particles in the mixed gas from the spray drying tank 1 is mostly between 0.05mm and 0.1mm, the first filter layer 22 is a 80-precision metal wire filter screen capable of filtering dust with a diameter larger than 0.1mm, the second filter layer 23 is a 50-precision metal wire filter screen capable of filtering dust with a diameter larger than 0.05mm, the third filter layer is a 28-precision metal filter screen capable of filtering dust with a diameter larger than 0.028mm, the third filter layer 24 has a higher precision than the second filter layer 23, so that the mixed gas not filtered by the second filter layer 23 can be filtered by the third filter layer 24, and similarly, the second filter layer 23 has a higher precision than the first filter layer 22, and at the same time, the filter layer with a higher precision can block the solid powder and then fall out of the lower-precision filter layer outside the mixed gas, the diameter of dust particles in the mixed gas from the spray drying tank 1 is mostly between 0.05mm and 0.1mm, and the mixed gas after layer-by-layer filtration meets the requirement of recycling, so that powder cannot be accumulated at the bottom end of the filter layer.

In this embodiment, as shown in fig. 1 and 2, the air inlet 21 is located on the side wall of the opposite position of the air outlet 25, so that the air inlet 21 can be ensured to form a direct convection channel, the flow rate of the mixed gas is increased, the filtering efficiency is improved, and the air inlet 21 is arranged at the upper end, so that the air inlet 21 is prevented from blowing up dust accumulated at the lower end.

In this embodiment, as shown in fig. 1 and fig. 2, a discharging pipe 26 is opened at a lower outlet of the filter box 2, an adjusting valve 27 is installed on the discharging pipe 26, the adjusting valve 27 is opened to output the dust accumulated in the discharging pipe 26 to the outside of the filter box, so that the dust can be conveniently collected, and the adjusting valve 27 can be closed during operation to prevent the airflow from escaping from the discharging pipe 26.

The working process of the utility model is as follows: the mixed gas discharged from the spray drying tank 1 enters the inside of the filter box 2 through the air inlet 21, then the dust with the diameter larger than 0.1mm is filtered by the first filter layer 22, the dust with the diameter larger than 0.05mm is filtered by the second filter layer 23, the dust with the diameter larger than 0.028mm is filtered by the third filter layer 24, most of the dust particles in the mixed gas discharged from the spray drying tank 1 are 0.05-0.1 in diameter, the mixed gas after filtering treatment layer by layer meets the requirement of recycling, the filtered gas is conveyed to the air inlet end of the spray dryer 1 through the vacuum pump 3 for recycling, the alumina dust blocked by the filter layers is deposited at the lower end of the filter box, and when the filter box 2 stops ventilation, the regulating valve 27 can be opened to recycle the solid powder.

Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments or portions thereof without departing from the spirit and scope of the invention.

Claims (6)

1. The utility model provides a spray drying jar return air circulation mechanism which characterized in that: including spray drying jar (1), rose box (2) and vacuum pump (3), the air-out end of spray drying jar (1) with air intake (21) of rose box (2) are connected, the air outlet (25) of rose box (2) with the air inlet end of vacuum pump (3) is connected, the air-out end of vacuum pump (3) with the air inlet end of spray drying jar (1) is connected, install a plurality of filter layer (20) in the cavity of rose box (2), it is a plurality of filter layer (20) with the lateral wall of rose box (2) forms the filter chamber, just air outlet (25) are located in the filter chamber.

2. The spray dryer canister return air circulation mechanism of claim 1, wherein: the upper end of the filter box (2) is cylindrical, the lower end is conical, the upper end of the filter box (2) is provided with the filter layer (20), the filter layer (20) comprises a first filter layer (22), a second filter layer (23) and a third filter layer (24), the third filter layer (24) is located on the inside of the second filter layer (23), the second filter layer (23) is located on the inside of the first filter layer (22), a first filter chamber (4) is formed by a gap between the first filter layer (22) and the second filter layer (23), a second filter chamber (5) is formed by the gap between the second filter layer (23) and the third filter layer (24), and a third filter cavity (28) is formed by a gap between the third filter layer (24) and the side wall of the filter box (2) provided with the air outlet, and the air outlet (25) is positioned in the third filter cavity (28).

3. The spray dryer canister return air circulation mechanism of claim 2, wherein: the first filter layer (22) is a wire filter screen with the precision of 80, the second filter layer (23) is a wire filter screen with the precision of 50, and the third filter layer is a wire filter screen with the precision of 28.

4. The spray dryer canister return air circulation mechanism of claim 2, wherein: the air inlet (21) is positioned on the side wall opposite to the air outlet (25).

5. The spray dryer canister return air circulation mechanism of claim 4, wherein: and a discharging pipe (26) is arranged at the outlet at the lower end of the filter box (2).

6. The spray dryer canister return air circulation mechanism of claim 5, wherein: and the discharging pipe (26) is provided with an adjusting valve (27).

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