Air stirring and aerating device for phosphoric acid storage tank

Abstract

The utility model relates to an air stirring and aerating device for a phosphoric acid storage tank, which comprises a straight pipe, the straight pipe extends from the top of the storage tank to the bottom of the storage tank, the bottom of the straight pipe is connected with an annular pipe through a communicating pipe, the straight pipe, the communicating pipe and the annular pipe are mutually communicated, and aerating discs or aerating nozzles are uniformly distributed in the circumferential direction of the annular pipe. According to the utility model, the aeration discs or the aeration nozzles are uniformly distributed at the bottom of the straight pipe, compressed air is cut into uniform small bubbles, the small bubbles are uniformly overflowed, hydrogen sulfide gas impurities in finished phosphoric acid are fully blown away during air aeration operation, and the phosphoric acid in the storage tank can be uniformly stirred according to the specific gravity during air stirring operation.

Description

Technical Field

[0001] This utility model relates to the field of phosphoric acid purification technology, specifically to an air stirring and aeration device for phosphoric acid storage tanks. Background Technology

[0002] Because the finished phosphoric acid in the phosphoric acid storage tank contains hydrogen sulfide gas impurities, air aeration is usually required to remove residual hydrogen sulfide gas. The produced phosphoric acid needs to be adjusted according to the target specific gravity (the actual produced phosphoric acid has a high specific gravity, so water needs to be added to mix the acid), which requires air agitation to ensure that the specific gravity of the finished phosphoric acid is uniform.

[0003] A phosphoric acid production device with low aluminum ion content, patent number CN202321097288.X, has the advantages of high filtration efficiency, high hydrogen sulfide removal efficiency, and low aluminum ion content. However, its air aeration method is as follows: the aeration tank has a first air pipe extending from the top to the bottom of the tank, and the first air pipe is connected to a compressed air unit via a second air pipe. This structure has the following defects: the first air pipe is a straight pipe, and the amount of compressed air used for aeration is difficult to control, which easily leads to waste; the aeration is too concentrated, and the aeration time is too long, which also wastes compressed air; the compressed air overflows directly from the pipe outlet, and the large bubbles formed cannot fully blow away the hydrogen sulfide gas mixed in with the finished phosphoric acid, nor can they fully agitate the phosphoric acid. Utility Model Content

[0004] The purpose of this utility model is to overcome the above-mentioned shortcomings and provide an air stirring and aeration device for phosphoric acid storage tanks. By evenly distributing aeration discs or aeration nozzles at the bottom of a straight pipe, compressed air is cut into uniform small bubbles. The small bubbles overflow evenly, and the hydrogen sulfide gas impurities in the finished phosphoric acid are fully blown away during the air aeration operation. During the air stirring operation, the specific gravity of the phosphoric acid in the storage tank can be stirred evenly.

[0005] The purpose of this utility model is achieved as follows:

[0006] An air stirring and aeration device for a phosphoric acid storage tank includes a straight pipe extending from the top to the bottom of the tank. The bottom of the straight pipe is connected to an annular pipe via a connecting pipe. The straight pipe, the connecting pipe, and the annular pipe are interconnected. Aeration discs or aeration nozzles are evenly distributed around the annular pipe.

[0007] Preferably, the connecting pipe is cross-shaped, and aeration discs or aeration nozzles are evenly distributed along the length of the connecting pipe.

[0008] Preferably, the aeration disc includes a first distribution branch pipe and an aeration disc head. The first distribution branch pipe is welded above the connecting pipe or annular pipe. The aeration disc head includes a mounting plate, an internal threaded sleeve, and a conical ring. The mounting plate has an internal threaded sleeve at its lower center. The internal threaded sleeve is screwed to the first distribution branch pipe. Multiple slots are evenly distributed circumferentially at the threaded connection between the internal threaded sleeve and the first distribution branch pipe. Multiple concentric conical rings are spaced apart outside the internal threaded sleeve. Through holes are evenly distributed on the conical surface of the conical ring.

[0009] Preferably, the bottom of the conical ring is the smaller diameter end.

[0010] Preferably, the through holes on two adjacent conical rings are staggered.

[0011] Preferably, the slot is provided in the circumferential direction of the external thread of the first distribution branch pipe head, or in the circumferential direction of the internal thread of the internal thread sleeve.

[0012] Preferably, the aeration nozzle includes a second distribution branch pipe and a plug. The second distribution branch pipe is welded to the bottom of the connecting pipe or the annular pipe, and the plug is disposed at the bottom of the distribution branch pipe. The plug and the second distribution branch pipe are spot welded together.

[0013] Preferably, multiple weld points are evenly distributed around the circumference of the plug, and 2-4 weld points are provided.

[0014] The beneficial effects of this utility model are:

[0015] This invention cuts compressed air into uniform small bubbles by evenly distributing aeration discs or aeration nozzles at the bottom of a straight pipe. The small bubbles overflow evenly, and the air aeration operation fully blows away hydrogen sulfide gas impurities in the finished phosphoric acid. The air stirring operation can agitate the phosphoric acid in the storage tank to make it uniform.

[0016] It effectively improves the efficiency of compressed air agitation and acid preparation, enabling phosphoric acid of different specific gravities to be agitated into a finished phosphoric acid product with uniform specific gravity more quickly; and saves the amount of compressed air required for agitation and aeration operations in phosphoric acid storage tanks. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of an air stirring and aeration device for a phosphate storage tank according to Embodiment 1 of this utility model.

[0018] Figure 2 This is a schematic diagram of the aeration disc structure.

[0019] Figure 3 This is a schematic diagram of the structure of an air stirring and aeration device for a phosphate storage tank according to Embodiment 2 of this utility model.

[0020] Figure 4 This is a schematic diagram of the aeration nozzle.

[0021] Among them: straight pipe 1; connecting pipe 2; ring pipe 3; aeration disc 4; first distribution branch pipe 4.1; aeration disc head 4.2; mounting plate 4.2.1; internal threaded sleeve 4.2.2; conical ring 4.2.3; through hole 4.2.4; slotted 4.3; aeration nozzle 5; second distribution branch pipe 5.1; plug 5.2. Detailed Implementation Example 1

[0022] See Figure 1 and Figure 2 This utility model relates to an air stirring and aeration device for a phosphoric acid storage tank, comprising a straight pipe 1, a connecting pipe 2, and an annular pipe 3. The straight pipe 1 extends from the top to the bottom of the storage tank. The bottom of the straight pipe 1 is connected to the annular pipe 3 via the connecting pipe 2. The connecting pipe 2 is cross-shaped. The straight pipe 1, the connecting pipe 2, and the annular pipe 3 are interconnected. Aeration discs 4 are evenly distributed along the length of the connecting pipe 2 and the circumference of the annular pipe 3. Each aeration disc 4 includes a first distribution branch pipe 4.1 and an aeration disc head 4.2. The first distribution branch pipe 4.1 is welded to the top of the connecting pipe 2 or the annular pipe 3 and is threadedly connected to the aeration disc head 4.2. The aeration disc head 4.2 includes a mounting plate 4.2.1, an internally threaded sleeve 4.2.2, and a conical ring 4.2.3. The internally threaded sleeve 4.2.2 is located at the center below the mounting plate 4.2.1. The first distribution branch pipe 4.1 is screwed in. Multiple slots 4.3 are evenly distributed circumferentially at the threaded connection between the internal threaded sleeve 4.2.2 and the first distribution branch pipe 4.1. Multiple conical rings 4.2.3 are spaced apart outside the internal threaded sleeve 4.2.2. Through holes 4.2.4 are evenly distributed on the conical surface of each conical ring 4.2.3. The bottom of the conical ring 4.2.3 is a small-diameter end, increasing the contact area between compressed air and the conical ring 4.2.3. The through holes on two adjacent conical rings 4.2.3 are staggered, prolonging the contact time between compressed air and the conical ring 4.2.3. Compressed air enters the tank bottom from the straight pipe 1, is distributed through the connecting pipe 2 and the annular pipe 3, and then enters each aeration disc. It overflows from the slots at the head of the distribution branch pipe and is cut into uniform small bubbles through the staggered through holes. The uniform overflow of the small bubbles effectively blows away hydrogen sulfide gas impurities in the finished phosphoric acid, while also agitating the phosphoric acid in the storage tank.

[0023] The slot 4.3 is provided in the external thread circumferential direction of the head of the first distribution branch pipe 4.1, or the slot 4.3 is provided in the internal thread circumferential direction of the internal thread sleeve 4.2.2. Example 2

[0024] See Figure 3 and Figure 4This utility model relates to an air stirring and aeration device for a phosphoric acid storage tank, comprising a straight pipe 1, a connecting pipe 2, and an annular pipe 3. The straight pipe 1 extends from the top of the storage tank to the bottom of the tank. The bottom of the straight pipe 1 is connected to the annular pipe 3 through the connecting pipe 2. The connecting pipe 2 is cross-shaped. The straight pipe 1, the connecting pipe 2, and the annular pipe 3 are interconnected. Aeration nozzles 5 are evenly distributed along the length of the connecting pipe 2 and the circumference of the annular pipe 3. Each aeration nozzle 5 includes a second distribution branch pipe 5.1 and a plug 5.2. The second distribution branch pipe 5.1 is welded to the bottom of the connecting pipe 2 or the annular pipe 3. The plug 5.2 is located at the bottom of the distribution branch pipe 5.1. The plug 5.2 and the second distribution branch pipe 5.1 are spot welded together, with multiple weld points evenly distributed along the circumference of the plug. The number of weld points is 2-4.

[0025] Compressed air enters the bottom of the tank from the straight pipe 1, and after being distributed through the connecting pipe 2 and the ring pipe 3, it enters each aeration nozzle 5. It overflows through the gap between the plug 5.2 and the second distribution branch pipe 5.1 where no spot welding has been performed, and is cut into uniform small bubbles. The small bubbles overflow evenly, which fully blows away the hydrogen sulfide gas impurities in the finished phosphoric acid, and at the same time can also stir the phosphoric acid in the storage tank evenly.

[0026] In addition to the above embodiments, this utility model also includes other implementation methods. All technical solutions formed by equivalent transformation or equivalent substitution should fall within the protection scope of the claims of this utility model.

Claims

1. An air stirring and aeration device for a phosphoric acid storage tank, comprising a straight pipe extending from the top to the bottom of the tank, characterized in that: The bottom of the straight pipe is connected to the annular pipe through a connecting pipe. The straight pipe, the connecting pipe and the annular pipe are interconnected. Aeration discs or aeration nozzles are evenly distributed around the annular pipe.

2. The air stirring and aeration device for a phosphoric acid storage tank according to claim 1, characterized in that: The connecting pipe is cross-shaped, and aeration discs or aeration nozzles are evenly distributed along the length of the connecting pipe.

3. The air stirring and aeration device for a phosphoric acid storage tank according to claim 2, characterized in that: The aeration disc includes a first distribution branch pipe and an aeration disc head. The first distribution branch pipe is welded above the connecting pipe or annular pipe. The aeration disc head includes a mounting plate, an internal threaded sleeve, and a conical ring. The mounting plate has an internal threaded sleeve at its lower center. The internal threaded sleeve is screwed to the first distribution branch pipe. Multiple slots are evenly distributed circumferentially at the threaded connection between the internal threaded sleeve and the first distribution branch pipe. Multiple concentric conical rings are spaced apart outside the internal threaded sleeve. Through holes are evenly distributed on the conical surface of the conical ring.

4. The air stirring and aeration device for a phosphoric acid storage tank according to claim 3, characterized in that: The bottom of the conical ring is the smaller diameter end.

5. The air stirring and aeration device for a phosphoric acid storage tank according to claim 4, characterized in that: The through holes on two adjacent conical rings are misaligned.

6. The air stirring and aeration device for a phosphoric acid storage tank according to claim 3, characterized in that: The slot is set in the circumferential direction of the external thread at the head of the first distribution branch pipe, or in the circumferential direction of the internal thread of the internal thread sleeve.

7. The air stirring and aeration device for a phosphoric acid storage tank according to claim 2, characterized in that: The aeration nozzle includes a second distribution branch pipe and a plug. The second distribution branch pipe is welded to the bottom of the connecting pipe or the annular pipe, and the plug is located at the bottom of the distribution branch pipe. The plug and the second distribution branch pipe are spot welded together.

8. The air stirring and aeration device for a phosphoric acid storage tank according to claim 7, characterized in that: Multiple weld points are evenly distributed around the circumference of the plug, with 2-4 weld points provided.

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