Automatic control device for air stirring and aeration for liquid storage tank

Abstract

The utility model relates to an automatic air stirring and aerating control device for a liquid storage tank, which is characterized in that a first pressure reduction regulating valve and a first pneumatic switch ball valve are arranged on a stirring pipeline, a second pressure reduction regulating valve and a second pneumatic switch ball valve are arranged on an aerating pipeline, and the stirring pipeline and the aerating pipeline are arranged outside the storage tank in parallel; the storage tank is provided with an ultrasonic liquid level meter, the stirring pipeline and the aeration pipeline are connected with a straight pipe after being converged, the straight pipe extends into the storage tank and extends to the bottom of the storage tank from the top of the storage tank, and the bottom of the straight pipe is connected with an in-tank aeration assembly. According to the utility model, the aeration branch and the stirring branch are arranged through the outside-tank compressed air pipeline to control the inside-tank aeration device, so that the two functions of stirring and aeration can be met, the full-automatic operation of the stirring and aeration process is realized, and the inside-tank pipeline and aerator parts are simplified; the device can be suitable for all liquid storage tanks which discontinuously use compressed air to blow off doped gas in liquid and have two functional requirements of stirring and aeration.

Description

Technical Field

[0001] This utility model relates to the field of phosphoric acid production technology, specifically to an automatic control device for air stirring and aeration in liquid 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 phosphoric acid entering the storage tank from the production unit needs to be precisely adjusted to a specific gravity by adding water, which requires air agitation to ensure that the specific gravity of the finished phosphoric acid is uniform.

[0003] In existing technologies, air aeration and agitation in storage tanks involve extending straight pipes from the top to the bottom of the tank. Air volume is manually controlled via a single manual valve, requiring experienced workers to adjust parameters such as pressure, flow rate, and time. This process is highly subjective, demands significant expertise from workers, and increases labor costs. Furthermore, straight pipe agitation and aeration make it difficult to control the amount of compressed air used, leading to waste. The large bubbles formed by compressed air overflowing directly from the pipe outlet fail to evenly agitate the phosphoric acid or adequately remove hydrogen sulfide contaminants from the finished phosphoric acid, resulting in low compressed air utilization efficiency. Utility Model Content

[0004] The purpose of this invention is to overcome the above-mentioned shortcomings and provide an automatic control device for air stirring and aeration in liquid storage tanks. An innovative design has been implemented in the external pipeline, using two branches—one for aeration and one for stirring—to control an internal aeration device, thus fulfilling both stirring and aeration functions. This achieves fully automatic operation of the stirring and aeration processes, simplifies the internal pipeline and aerator components, and is applicable to all liquid storage tanks where compressed air is used intermittently to remove impurities from the liquid, and where both stirring and aeration functions are required. It effectively improves compressed air utilization efficiency and reduces air consumption, enhances the automation level of the device, and reduces labor intensity.

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

[0006] An automatic control device for air stirring and aeration of a liquid storage tank includes a storage tank, a stirring pipeline, an aeration pipeline, a first pressure reducing regulating valve, a second pressure reducing regulating valve, a first pneumatic switch ball valve, and a second pneumatic switch ball valve. The first pressure reducing regulating valve and the first pneumatic switch ball valve are installed on the stirring pipeline, and the second pressure reducing regulating valve and the second pneumatic switch ball valve are installed on the aeration pipeline. The stirring pipeline and the aeration pipeline are connected in parallel outside the storage tank. The storage tank is equipped with an ultrasonic level gauge. The stirring pipeline and the aeration pipeline merge and are connected to a straight pipe that extends into the storage tank from the top to the bottom. The bottom of the straight pipe is connected to an aeration assembly inside the tank. The first pneumatic switch ball valve and the second pneumatic switch ball valve are respectively equipped with a first solenoid valve and a second solenoid valve. The first solenoid valve and the second solenoid valve are electrically connected to a first multi-functional delay switch and a second multi-functional delay switch, respectively. The first multi-functional delay switch, the second multi-functional delay switch, and the ultrasonic level gauge are all electrically connected to an intelligent digital display alarm.

[0007] Preferably, the first pressure reducing regulating valve controls the pressure and flow rate of the air agitator, with the agitation pressure being 2.2-2.4 bar and the flow rate being 40-60 m³ / h. The first multi-functional delay switch controls the air agitation time and cycle, with the mixing time as the agitation set time, and the agitation operation time is set to 2 hours.

[0008] Preferably, the second pressure reducing regulating valve controls the pressure and flow rate for air aeration, with an aeration pressure of 1.5-2 bar and a flow rate of 15-30 m³ / h. The second multi-functional delay switch controls the air aeration time and cycle period. The aeration operation has two time control modes to choose from: one is demand-based, which is set to the standard completion time of one tower deaeration; the other is a repetitive cycle mode.

[0009] Preferably, the in-tank aeration assembly includes an annular pipe, a connecting pipe, and aeration discs. The connecting pipe is cross-shaped, and the straight pipe is interconnected with the annular pipe and the connecting pipe. Aeration discs are evenly distributed around the annular pipe.

[0010] Preferably, the connecting pipe is cross-shaped, and aeration discs are evenly distributed along the length of the connecting pipe.

[0011] Preferably, the aeration disc includes a distribution branch pipe and an aeration disc head. The distribution branch pipe is welded above the connecting pipe or the 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 distribution branch pipe. Multiple slots are evenly distributed circumferentially at the threaded connection between the internal threaded sleeve and the distribution branch pipe. Multiple concentric conical rings are spaced apart outside the internal threaded sleeve.

[0012] Preferably, the conical surface of the conical ring is evenly distributed with through holes, and the through holes on two adjacent conical rings are staggered.

[0013] The beneficial effects of this utility model are:

[0014] The pressure and flow rate required for aeration and mixing are set by the corresponding pressure reducing regulating valve, the time and cycle of aeration and mixing are set by the corresponding multi-functional delay switch, and the opening / closing of the pneumatic switch ball valve is controlled by the solenoid valve. The pressure reducing regulating valve of the aeration branch is set with a small pressure to meet the required flow rate for aeration and a long cycle; the pressure reducing regulating valve of the mixing branch is set with a large pressure to meet the required flow rate for mixing and a short cycle.

[0015] The low liquid level and very low liquid level protections set by the intelligent numerical control alarm instrument are triggered by the liquid level signal of the ultrasonic level gauge on the top of the tank, and the stirring and aeration pipelines are shut off.

[0016] By evenly distributing aeration discs at the bottom of the compressed air straight pipe inside the tank, the 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 thoroughly 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, thereby improving the efficiency of compressed air use and saving the amount of compressed air used. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of an automatic control device for air stirring and aeration in a liquid storage tank according to the present invention.

[0018] Figure 2 This is a schematic diagram of the structural distribution of the aeration discs.

[0019] Figure 3 This is a schematic diagram of the internal structure of the aeration disc.

[0020] The components include: storage tank 1; stirring pipeline 2; aeration pipeline 3; straight pipe 4; in-tank aeration assembly 5; ring pipe 5.1; connecting pipe 5.2; aeration disc 5.3; distribution branch pipe 5.3.1; aeration disc head 5.3.2; mounting plate 5.3.2.1; internal threaded sleeve 5.3.2.2; conical ring 5.3.2.3; through hole 5.3.2.4; first pressure reducing regulating valve 6; second pressure reducing regulating valve 7; first pneumatic switch ball valve 8; second pneumatic switch ball valve 9; first solenoid valve 10; second solenoid valve 11; first multi-functional delay switch 12; second multi-functional delay switch 13; intelligent digital display alarm 14; and ultrasonic level gauge 15. Detailed Implementation

[0021] See Figure 1-3This utility model relates to an automatic control device for air stirring and aeration in a liquid storage tank, comprising a storage tank 1, a stirring pipeline 2, an aeration pipeline 3, a first pressure reducing regulating valve 6, a second pressure reducing regulating valve 7, a first pneumatic switch ball valve 8, a second pneumatic switch ball valve 9, a first solenoid valve 10, a second solenoid valve 11, a first multi-functional delay switch 12, a second multi-functional delay switch 13, an intelligent digital display alarm 14, and an ultrasonic level gauge 15. The stirring pipeline 2 and the aeration pipeline 3 are arranged in parallel outside the storage tank 1. The stirring pipeline 2 and the aeration pipeline 3 merge and are connected to a straight pipe 4. The straight pipe 4 extends into the storage tank 1 from the top to the bottom of the tank. The bottom of the straight pipe 4 is connected to the aeration assembly 5 inside the tank through a connecting pipe 5.

[0022] The first pressure reducing regulating valve 6 and the first pneumatic switch ball valve 8 are installed on the stirring pipeline 2, and the second pressure reducing regulating valve 7 and the second pneumatic switch ball valve 9 are installed on the aeration pipeline 3. The stirring pipeline 2 and the aeration pipeline 3 are connected in parallel. The storage tank 1 is equipped with an ultrasonic level gauge 15. The first pneumatic switch ball valve 8 and the second pneumatic switch ball valve 9 are controlled by the first solenoid valve 10 and the second solenoid valve 11, respectively, thereby controlling the opening and closing of the corresponding pipelines. The first solenoid valve 10 and the second solenoid valve 11 are electrically connected to the first multi-functional delay switch 12 and the second multi-functional delay switch 13, respectively. The first multi-functional delay switch 12, the second multi-functional delay switch 13 and the ultrasonic level gauge 15 are all electrically connected to the intelligent digital display alarm instrument 14.

[0023] The first pressure reducing regulating valve 6 controls the pressure and flow rate of the air agitator. The agitation pressure is 2.2-2.4 bar, and the flow rate is 40-60 m³ / h. The first multi-functional delay switch 12 controls the air agitation time and cycle. According to the set agitation time and cycle, the first multi-functional delay switch 12 controls the first pneumatic switch ball valve 8 through the first solenoid valve 10. The opening / closing of the first pneumatic switch ball valve 8 controls the opening / closing of the output air of the agitation pipeline 2. According to specific requirements, the mixing time is used as the agitation set time, which is currently set to 2 hours.

[0024] The second pressure-reducing regulating valve 7 controls the pressure and flow rate for air aeration. The aeration pressure is 1.5-2 bar, and the flow rate is 15-30 m³ / h. The second multi-functional delay switch 13 controls the air aeration time and cycle period. According to the set aeration time and cycle period, the second multi-functional delay switch 13 controls the second pneumatic switch ball valve 9 through the second solenoid valve 11. The opening / closing of the second pneumatic switch ball valve 9 controls the opening / closing of the output air of the aeration pipeline 3. The aeration operation has two time control modes to choose from: one is demand-based, generally set to the standard completion time of one tower deaeration, such as 16:00 or 24:00; the other is a reciprocating cycle mode.

[0025] The low liquid level and very low liquid level protection signals from the ultrasonic level gauge 15 on the top of the tank are triggered by the intelligent digital control alarm 15, which forcibly shuts down the stirring and aeration pipelines. The stirring pipeline has a control button, and the aeration pipeline has a control button; when the liquid level protection is activated, the corresponding control button is forcibly disconnected. When the liquid level in the tank is ≤1.6m, the ultrasonic level gauge feeds back a low low liquid level signal to the intelligent digital display alarm, triggering the low low liquid level protection. The controller then controls the second pneumatic switch ball valve to close, shutting down the aeration pipeline. When the liquid level in the tank is ≤4m, the ultrasonic level gauge feeds back a low liquid level signal to the intelligent digital display alarm, triggering the low liquid level protection. The controller then controls the first pneumatic switch ball valve to close, shutting down the stirring pipeline.

[0026] The tank aeration assembly 5 includes an annular pipe 5.1, a connecting pipe 5.2, and an aeration disc 5.3. The connecting pipe 5.2 is cross-shaped. The straight pipe 4 is interconnected with the annular pipe 5.1 and the connecting pipe 5.2. The aeration discs 5.3 are evenly distributed along the length of the connecting pipe 5.2 and around the circumference of the annular pipe 5.1.

[0027] The aeration disc 5.3 includes a distribution branch pipe 5.3.1 and an aeration disc head 5.3.2. The distribution branch pipe 5.3.1 is welded to the upper part of the connecting pipe 5.2 or the annular pipe 5.1. The distribution branch pipe 5.3.1 is threadedly connected to the aeration disc head 5.3.2. The aeration disc head 5.3.2 includes a mounting plate 5.3.2.1, an internally threaded sleeve 5.3.2.2, and a conical ring 5.3.2.3. The mounting plate 5.3.2.1 has an internally threaded sleeve 5.3.2.2 at its center below. The internally threaded sleeve 5.3.2.2 is threaded to the distribution branch pipe 5.3.1. The internally threaded sleeve 5.3.2.2 has multiple slots evenly distributed around its circumference at the threaded connection point with the distribution branch pipe 5.3.1. The internally threaded sleeve 5.3.2.2 has multiple conical rings 5 ​​at intervals around its outer surface. 3.2.3, The conical surface of the conical ring 5.3.2.3 is evenly distributed with through holes 5.3.2.4. The bottom of the conical ring 5.3.2.3 is a small diameter end, which increases the contact area between the compressed air and the conical ring. The through holes 5.3.2.4 on two adjacent conical rings 5.3.2.3 are staggered to prolong the contact time between the compressed air and the conical ring. The compressed air enters the bottom of the tank from the straight pipe 4, and after being distributed through the connecting pipe 5.2 and the ring pipe 5.1, it enters each aeration plate 5.3. It overflows from the slot at the head of the distribution branch pipe 5.3.1 and is cut into uniform small bubbles through the staggered through holes. 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 phosphoric acid in the storage tank can be stirred evenly.

[0028] The slot is set in the external thread circumference of the head of the distribution branch pipe 5.3.1, or the slot is set in the internal thread circumference of the internal thread sleeve.

[0029] An automatic control device for air stirring and aeration in a liquid storage tank includes the following steps:

[0030] The ultrasonic level gauge 15 on the storage tank 1 collects the liquid level signal in the storage tank and feeds the liquid level signal back to the intelligent digital display alarm 14. The intelligent digital display alarm 14 compares the received liquid level signal with the preset liquid level.

[0031] When the liquid level signal is within the set liquid level value, select the operating mode as needed, and set the stirring or aeration time and cycle through the corresponding multi-functional delay switch to carry out stirring or aeration operations.

[0032] When the liquid level signal is lower than the set liquid level value, the low liquid level protection of the intelligent digital display alarm 14 is activated.

[0033] When the liquid level in the tank is ≤4m, the ultrasonic level gauge 15 will feed back the low liquid level signal to the intelligent digital display alarm 14, triggering the low liquid level protection. The first solenoid valve 10 controls the first pneumatic switch ball valve 8 to close, and the stirring pipeline 2 to close.

[0034] When the liquid level in the tank is ≤1.6m, the ultrasonic level gauge 15 feeds back the low liquid level signal to the intelligent digital display alarm 14, triggering the low liquid level protection. The second solenoid valve 11 controls the second pneumatic switch ball valve 9 to close, and the aeration pipeline 3 is closed.

[0035] 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 automatic control device for air stirring and aeration in a liquid storage tank, characterized in that: The system includes a storage tank, a stirring pipeline, an aeration pipeline, a first pressure-reducing regulating valve, a second pressure-reducing regulating valve, a first pneumatic ball valve, and a second pneumatic ball valve. The first pressure-reducing regulating valve and the first pneumatic ball valve are located on the stirring pipeline, while the second pressure-reducing regulating valve and the second pneumatic ball valve are located on the aeration pipeline. The stirring pipeline and the aeration pipeline are connected in parallel outside the storage tank. The storage tank is equipped with an ultrasonic level gauge. The stirring pipeline and the aeration pipeline merge and are connected to a straight pipe that extends into the storage tank from the top to the bottom. The bottom of the straight pipe is connected to an aeration assembly inside the tank. The first pneumatic ball valve and the second pneumatic ball valve are respectively equipped with a first solenoid valve and a second solenoid valve. The first solenoid valve and the second solenoid valve are electrically connected to a first multi-functional delay switch and a second multi-functional delay switch, respectively. The first multi-functional delay switch, the second multi-functional delay switch, and the ultrasonic level gauge are all electrically connected to an intelligent digital display alarm.

2. The automatic control device for air stirring and aeration in a liquid storage tank according to claim 1, characterized in that: The first pressure reducing regulating valve controls the pressure and flow rate of the air agitator. The agitation pressure is 2.2-2.4 bar and the flow rate is 40-60 m³ / h. The first multi-functional delay switch controls the air agitation time and cycle, with the mixing time as the agitation set time. The agitation operation time is set to 2 hours.

3. The automatic control device for air stirring and aeration in a liquid storage tank according to claim 1, characterized in that: The second pressure reducing regulating valve controls the pressure and flow rate for air aeration. The aeration pressure is 1.5-2 bar and the flow rate is 15-30 m³ / h. The second multi-functional delay switch controls the air aeration time and cycle. There are two time control modes for aeration operation: one is demand-based, which is set to the standard completion time of one tower deaeration; the other is cyclic mode.

4. The automatic control device for air stirring and aeration in a liquid storage tank according to claim 1, characterized in that: The in-tank aeration assembly includes an annular pipe, a connecting pipe, and aeration discs. The connecting pipe is cross-shaped, and the straight pipe is interconnected with the annular pipe and the connecting pipe. Aeration discs are evenly distributed around the annular pipe.

5. An automatic control device for air stirring and aeration in a liquid storage tank according to claim 4, characterized in that: The connecting pipe is cross-shaped, and aeration discs are evenly distributed along the length of the connecting pipe.

6. The automatic control device for air stirring and aeration in a liquid storage tank according to claim 5, characterized in that: The aeration disc includes a distribution branch pipe and an aeration disc head. The distribution branch pipe is welded above the connecting pipe or the annular pipe. The aeration disc head includes a mounting plate, an internal threaded sleeve, and a conical ring. The internal threaded sleeve is provided at the center of the lower part of the mounting plate. The internal threaded sleeve is screwed to the distribution branch pipe. Multiple slots are evenly distributed around the threaded connection between the internal threaded sleeve and the distribution branch pipe. Multiple concentric conical rings are provided at intervals outside the internal threaded sleeve.

7. An automatic control device for air stirring and aeration in a liquid storage tank according to claim 6, characterized in that: The conical surface of the conical ring is evenly distributed with through holes, and the through holes on two adjacent conical rings are staggered.

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