Acid storage tank slag cleaning method and system

Abstract

The present invention relates to the technical field of storage tanks, and discloses a method and system for cleaning slag from an acid storage tank, comprising: an acid storage tank, a breathing port and an air suction port are arranged on the top of the acid storage tank, and the breathing port and the air suction port are used to circulate the acid mist in the acid storage tank; a liquid level gauge is connected to the side wall of the acid storage tank; an intermediate tank, a heat exchanger is arranged inside the intermediate tank, and the heat exchanger is used to heat the acid liquid through a fourth pipe and a fifth pipe, and a slag discharge pipe is arranged at the bottom of the intermediate tank; a pipe network is used to connect the acid storage tank, the intermediate tank and an acid-using device. When the slag cleaning operation starts, the first pipe and the third pipe are opened to allow the acid liquid to flow from the acid storage tank into the intermediate tank, and then the acid liquid enters the acid storage tank through the third pipe, and flushes the acid slag at the bottom of the tank to the intermediate tank, and after the flushing is completed, the first pipe is closed, and the acid liquid flows back to the acid storage tank through the third pipe, and the acid slag in the intermediate tank is discharged through the slag discharge pipe.

Description

Technical Field

[0001] The present invention relates to the technical field of acid storage tanks, and more particularly, to a method and system for cleaning acid residues in an acid storage tank. Background Art

[0002] Currently, low-level acid storage tanks are usually placed underground, and acid residues gradually deposit at the bottom of the tank, forming a relatively thick solid layer, which is difficult to clean and poses a high safety risk. When manually cleaning acid residues, workers need to enter the acid tank or approach the bottom of the acid tank. However, highly corrosive gases and acid mists are often present in the acid tank, which can easily cause harm to the human body. Moreover, the space in the acid tank is narrow, making it difficult to complete the cleaning thoroughly, especially for the acid residues deposited around the bottom of the tank, which is even more laborious.

[0003] High-level acid storage tanks are generally designed with a conical bottom, and acid residues gradually deposit at the lowest part of the conical bottom. The original intention of this design is to concentrate the acid residues by gravity for convenient regular discharge. However, since the acid residues become firm after accumulation, the deposits formed over time are very difficult to clean. The acid residues that have not been cleaned for a long time gradually solidify and even block the slag discharge port, and it is necessary to rely on powerful mechanical crushing or manual handling. To prevent the acid residues from blocking, it is necessary to frequently discharge the acid residue liquid, and each discharge will carry away a certain amount of acid liquid, resulting in waste. In addition, cleaning acid residues not only occupies the operators but also affects the normal operation of the equipment.

[0004] Therefore, it is particularly important to design a safe slag cleaning method or system that does not require stopping the operation. Summary of the Invention

[0005] In view of this, the present invention provides a method and system for cleaning acid residues in an acid storage tank, aiming to solve the problem that the current technology requires manual treatment and must stop the operation for slag cleaning.

[0006] An acid storage tank slag cleaning system provided by the present invention includes: an acid storage tank, at the top of which there are a breathing port and a suction port for circulating the acid mist in the acid storage tank; a liquid level gauge is connected to the side wall of the acid storage tank;

[0007] An intermediate tank, inside which there is a heat exchanger for heating the acid liquid, and a slag discharge pipeline is provided at the bottom of the intermediate tank;

[0008] A first pipeline, the two ends of which are respectively connected to the bottom of the acid storage tank and the side wall of the intermediate tank; a second pipeline, the two ends of which are respectively connected to the side wall of the acid storage tank and a fourth pipeline; a third pipeline, the two ends of which are respectively connected to the bottom of the side wall of the intermediate tank and the side wall of the acid storage tank, and a pumping device is connected to the third pipeline for pumping the acid liquid from the intermediate tank into the acid storage tank; a fourth pipeline, the two ends of which are connected to the intermediate tank and an acid-using device; the connection point of the third pipeline and the acid storage tank is higher than the connection point of the second pipeline and the acid storage tank.

[0009] Optionally, the fourth pipeline is a three-way pipeline, two ports of the fourth pipeline are respectively connected to the side wall of the intermediate tank and the acid device, and the other port is connected to the second pipeline through an acid valve;

[0010] Furthermore, it also includes:

[0011] A fifth pipeline, one end of which is connected to the acid-using device, and the other end of which is inserted into the interior of the intermediate tank.

[0012] Furthermore, a collection unit is provided at the bottom of the liquid level meter, and the collection unit is configured to collect the acid slag thickness, and the collection unit is electrically connected to the control unit, and the control unit controls the opening and closing of different valves in the first pipeline, the second pipeline, the third pipeline and the fourth pipeline according to the acid slag thickness;

[0013] The control unit is also electrically connected to the acid extraction device and controls the rotation speed of the booster pump in the acid extraction device according to the thickness of the acid slag.

[0014] Furthermore, the top of the acid storage tank is connected with at least one concentrated acid port for increasing the concentration of the acid solution.

[0015] Furthermore, a blocking plate is provided at the connection between the first pipeline and the inner side of the intermediate tank.

[0016] On the other hand, the present invention also provides an acid storage tank slag cleaning method, which is applied to the above-mentioned acid storage tank slag cleaning system, comprising:

[0017] When the slag cleaning operation starts, the first pipeline and the third pipeline are opened, and the acid liquid flows from the acid storage tank into the intermediate tank and enters the acid storage tank through the third pipeline to wash the tank bottom. After the washing is completed, the acid residue in the intermediate tank is allowed to settle to the bottom, and the first pipeline is closed. The acid liquid returns to the acid storage tank through the third pipeline, and the acid residue is discharged through the slag discharge pipeline, and the third pipeline is closed;

[0018] When no slag cleaning operation is performed, the first pipeline and the third pipeline are closed, the second pipeline is opened, and the acid liquid flows from the acid storage tank through the second pipeline into the acid using device, the fourth pipeline and the fifth pipeline are opened for circulating heating pickling, and when the pickling is completed, the third pipeline is opened to return the acid liquid to the acid storage tank.

[0019] Furthermore, the control unit controls the opening and closing of different valves in the first pipeline, the second pipeline, the third pipeline and the fourth pipeline according to the thickness of the acid slag, specifically including:

[0020] An acid slag thickness cleaning threshold and an acid slag thickness initial threshold are set, the acid slag thickness cleaning threshold is greater than the acid slag thickness initial threshold, when the acid slag thickness exceeds the acid slag thickness cleaning threshold, it is determined that slag cleaning is required, the first pipeline and the third pipeline are opened, the acid liquid flows from the acid storage tank into the intermediate tank and enters the acid storage tank through the third pipeline to rinse the tank bottom, after the rinsing is completed, the acid slag in the intermediate tank is allowed to settle to the bottom, the first pipeline is closed, the acid liquid returns to the acid storage tank through the third pipeline, the acid slag is discharged through the slag discharge pipeline, and the third pipeline is closed;

[0021] When the acid slag thickness is lower than the initial threshold value of the acid slag thickness, it is determined that the slag cleaning operation is completed, the first pipeline and the third pipeline are closed, the second pipeline is opened, and the acid flows from the acid storage tank through the second pipeline into the acid using device. The fourth pipeline and the fifth pipeline are opened for circulating heating pickling. When the pickling is completed, the third pipeline is opened to return the acid to the acid storage tank.

[0022] Furthermore, the control unit is also electrically connected to the acid extraction device, and controlling the rotation speed of the booster pump in the acid extraction device according to the thickness of the acid slag specifically includes:

[0023] The acid slag thickness is further divided into a first acid slag thickness, a second acid slag thickness and a third acid slag thickness, and the initial threshold of the acid slag thickness is less than the first acid slag thickness, less than the second acid slag thickness, less than the third acid slag thickness, less than the acid slag thickness cleaning threshold, and the speed of the lifting pump is divided into a first speed, a second speed, a third speed and a fourth speed, and the first speed is less than the second speed, less than the third speed, less than the fourth speed; the lifting pump speed is determined according to the relationship between the current acid slag thickness and the initial threshold of the acid slag thickness, the first acid slag thickness, the second acid slag thickness, the third acid slag thickness and the acid slag thickness cleaning threshold.

[0024] Further, the determining of the lift pump speed according to the relationship between the current acid slag thickness and the acid slag thickness initial threshold, the first acid slag thickness, the second acid slag thickness, the third acid slag thickness and the acid slag thickness cleaning threshold specifically includes:

[0025] When the current acid slag thickness is greater than or equal to the initial threshold of acid slag thickness and less than the first acid slag thickness, the lifting pump selects the first speed; when the current acid slag thickness is greater than or equal to the first acid slag thickness and less than the second acid slag thickness, the lifting pump selects the second speed; when the current acid slag thickness is greater than or equal to the second acid slag thickness and less than the third acid slag thickness, the lifting pump selects the third speed; when the current acid slag thickness is greater than or equal to the third acid slag thickness and less than the acid slag thickness cleaning threshold, the lifting pump selects the fourth speed.

[0026] Compared with the prior art, the beneficial effect of the present invention is that the acid storage tank slag removal system is a system for processing acid slag generated when storing acid liquid. It includes components such as an acid storage tank, an intermediate tank, multiple pipelines and a control unit. A breathing port and an air suction port are provided on the top of the acid storage tank for circulating the acid mist in the acid storage tank. A liquid level gauge is connected to the side wall of the acid storage tank for monitoring the liquid level of the acid liquid. A heat exchanger is provided inside the intermediate tank for heating the acid liquid. A slag discharge pipeline is provided at the bottom of the intermediate tank for discharging the acid slag. The first pipeline in the system connects the acid storage tank and the side wall of the intermediate tank. The second pipeline connects the acid storage tank and the acid using device. The third pipeline connects the side wall bottom of the intermediate tank and the side wall of the acid storage tank, and is connected to an acid extraction device for extracting the acid liquid from the intermediate tank back to the acid storage tank. The connection point between the third pipeline and the acid storage tank is higher than the connection point between the second pipeline and the acid storage tank to keep the acid liquid flowing in the system. In addition to the above components, the system also includes a fourth pipeline, which is a three-way pipeline, two ports of which are connected to the side wall of the intermediate tank, and the other port is connected to the acid device through an acid valve. The fifth pipeline connects the acid device and the inside of the intermediate tank. A collection unit is provided at the bottom of the level gauge for collecting the thickness of the acid slag. The collection unit is electrically connected to the control unit, and the control unit controls the opening and closing of the valves in different pipelines according to the thickness of the acid slag, and controls the speed of the lifting pump in the acid extraction device. The top of the acid storage tank is also connected to at least one concentrated acid port for increasing the concentration of the acid solution. A baffle is provided at the connection between the first pipeline and the inner side of the intermediate tank for guiding the flow of the acid solution. The acid storage tank slag removal method is a method applied to the above-mentioned acid storage tank slag removal system. When the slag removal operation starts, the first pipeline and the third pipeline are opened to allow the acid solution to flow from the acid storage tank into the intermediate tank. Then, the acid solution enters the acid storage tank through the third pipeline and cleans the bottom of the tank. After the rinsing is completed, it is left to stand until the acid slag settles to the bottom. After closing the first pipeline, the acid solution flows back to the acid storage tank through the third pipeline, and the acid slag is discharged through the slag discharge pipeline. When the slag cleaning operation is not performed, the first pipeline and the third pipeline are closed, and the second pipeline is opened to allow the acid to flow from the acid storage tank into the acid using device, and then the fourth and fifth pipelines are opened for circulating heating pickling. After the pickling is completed, the third pipeline is opened to pump the acid back to the acid storage tank. The control unit controls the opening and closing of the valve and the speed of the booster pump according to the change in the thickness of the acid slag. Different operating modes and speeds are selected according to the relationship between the thickness of the acid slag and the threshold. This acid storage tank slag cleaning system and method can effectively handle the acid slag generated during the acid storage process, and realize automatic control, thereby improving work efficiency and safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present invention. Moreover, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0028] Figure 1 This is a schematic plan view of a slag removal system for an acid storage tank according to an embodiment of the present invention;

[0029] Figure 2 This is a partial enlarged view of the acid storage tank and the intermediate tank of an acid storage tank slag cleaning system according to an embodiment of the present invention.

[0030] In the figure, 1. acid storage tank; 2. breathing port; 3. air intake port; 4. liquid level gauge; 5. intermediate tank; 6. heat exchanger; 7. slag discharge pipeline; 8. first pipeline; 9. second pipeline; 10. third pipeline; 11. acid extraction device; 12. fourth pipeline; 13. acid using device; 14. acid using valve; 15. fifth pipeline; 16. collection unit; 17. control unit; 18. concentrated acid port. DETAILED DESCRIPTION

[0031] Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided in order to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art. It should be noted that, in the absence of conflict, the embodiments of the present invention and the features described in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0032] Depend on Figure 1 As shown, this embodiment provides an acid storage tank slag cleaning system, comprising: an acid storage tank 1, a breathing port 2 and an air suction port 3 are arranged on the top of the acid storage tank, and the breathing port 2 and the air suction port 3 are used to circulate the acid mist in the acid storage tank 1; a liquid level meter 4 is connected to the side wall of the acid storage tank 1;

[0033] The middle tank 5 has a heat exchanger 6 disposed inside thereof, and the heat exchanger 6 is used to heat the acid solution. A slag discharge pipe 7 is disposed at the bottom of the middle tank 5;

[0034] The first pipeline 8 has two ends respectively connected with the bottom of the acid storage tank 1 and the side wall of the intermediate pool 5; the second pipeline 9 has two ends respectively connected with the side wall of the acid storage tank 1 and the fourth pipeline 12; the third pipeline 10 has two ends respectively connected with the bottom of the side wall of the intermediate pool 5 and the side wall of the acid storage tank 1, and the third pipeline 10 is connected with an acid extraction device 11, which is used to pump acid from the intermediate pool 5 into the acid storage tank 1; the fourth pipeline 12 has two ends connected with the intermediate pool 5 and the acid using device 13; the connection point between the third pipeline 10 and the acid storage tank 1 is higher than the connection point between the second pipeline 9 and the acid storage tank 1.

[0035] It is understandable that the slag cleaning of the high-level acid storage tank 1 in the system only requires a lifting pump for acid discharge and an intermediate tank 5, which can be cleaned at any time. After the acid slag flows to the intermediate tank 5, the acid slag can be discharged into the wastewater ditch when there is no acid in the tank. A movable slag bucket lined with a space bag is set in the wastewater tank. The acid slag flows into the space bag through the wastewater ditch and can be lifted out by a crane for treatment. The lifting pump and the intermediate tank 5 used in the entire slag cleaning process are existing equipment in the pickling system, and there is no need for manual direct contact with the acid slag or entering a confined space for operation. The cleaning process is short, the cleaning time is free, and there is no need to stop work for cleaning or occupy pickling work time.

[0036] In this preferred embodiment, it also includes:

[0037] The fourth pipeline 12 is a three-way pipeline, two ports of which are respectively connected to the side wall of the intermediate tank 5 and the acid device 13 , and the other port is connected to the second pipeline 9 through the acid valve 14 .

[0038] In this preferred embodiment, it also includes:

[0039] The fifth pipeline 15 has one end connected to the acid device 13 and the other end inserted into the middle tank 5 .

[0040] In this preferred embodiment, a collection unit 16 is provided at the bottom of the liquid level meter 4, and the collection unit 16 is configured to collect the acid slag thickness. The collection unit 16 is electrically connected to the control unit 17, and the control unit 17 controls the opening and closing of different valves in the first pipeline 8, the second pipeline 9, the third pipeline 10 and the fourth pipeline 12 according to the acid slag thickness;

[0041] The control unit 17 is also electrically connected to the acid extraction device 11, and controls the rotation speed of the booster pump in the acid extraction device 11 according to the thickness of the acid slag.

[0042] In this preferred embodiment, the top of the acid storage tank 1 is connected with two concentrated acid ports 18 for increasing the concentration of the acid solution.

[0043] In this preferred embodiment, a blocking plate is provided at the connection between the first pipeline 8 and the inner side of the intermediate tank 5 .

[0044] It is understandable that the acid storage tank slag cleaning system realizes the efficient management of acid liquid and acid slag through multiple intelligent components and pipeline networks. The system can automatically monitor the thickness of acid slag and adjust the operations of pipelines and pumps according to the monitoring results to optimize the slag cleaning process. This not only improves the operating efficiency of the system but also reduces the dependence on manual operations. The breathing port 2 and the suction port 3 are used to manage the air pressure inside the acid tank and balance the acid mist to ensure the safe operation of the system. The liquid level gauge 4 is used to measure the liquid level of the acid liquid to prevent operating problems caused by overage or shortage. The intermediate tank 5 serves as a transfer and heating place for the acid liquid, and the slag discharge pipeline 7 at its bottom is designed to facilitate the cleaning of the precipitated acid slag. The heat exchanger 6 heats the acid liquid to improve the cleaning efficiency and reaction rate. The first to third pipelines 10 are designed to circulate the acid liquid between the acid storage tank 1 and the intermediate tank 5, and different operating purposes are achieved by adjusting the flow direction. The fifth pipeline 15 connects the acid-using device 13 and the intermediate tank 5 to further expand the utilization of the acid liquid.

[0045] The acid storage tank slag cleaning system is a system used to handle the acid slag generated during the storage of acid liquid. It includes components such as the acid storage tank 1, the intermediate tank 5, multiple pipelines, and the control unit 17. The breathing port 2 and the suction port 3 are provided at the top of the acid storage tank 1 for circulating the acid mist inside the acid storage tank 1. The side wall of the acid storage tank 1 is connected with the liquid level gauge 4 for monitoring the liquid level of the acid liquid. The heat exchanger 6 is arranged inside the intermediate tank 5 for heating the acid liquid. The slag discharge pipeline 7 is provided at the bottom of the intermediate tank 5 for discharging the acid slag. The first pipeline 8 in the system connects the side walls of the acid storage tank 1 and the intermediate tank 5. The second pipeline 9 has both ends communicating with the side wall of the acid storage tank 1 and the acid-using device 13 respectively. The third pipeline 10 connects the bottom of the side wall of the intermediate tank 5 and the side wall of the acid storage tank 1 and is connected with the acid pumping device 11 for pumping the acid liquid from the intermediate tank 5 back to the acid storage tank 1. The connection point of the third pipeline 10 with the acid storage tank 1 is higher than the connection point of the second pipeline 9 with the acid storage tank 1 to maintain the flow of the acid liquid in the system. In addition to the above components, the system also includes the fourth pipeline 12, which is a three-way pipeline with one end connected to the acid storage tank 1 and the other two ports respectively connected to the side wall of the intermediate tank 5 and the acid-using device 13. The fifth pipeline 15 connects the acid-using device 13 and the inside of the intermediate tank 5. The collecting unit 16 is arranged at the bottom of the liquid level gauge 4 for collecting the thickness of the acid slag. The collecting unit 16 is electrically connected with the control unit 17, and the control unit 17 controls the opening and closing of the valves in different pipelines according to the thickness of the acid slag and controls the rotation speed of the lift pump in the acid pumping device 11. At least one concentrated acid port 18 is also connected to the top of the acid storage tank 1 for increasing the concentration of the acid liquid. A baffle is arranged at the connection of the first pipeline 8 and the inside of the intermediate tank 5 for guiding the flow of the acid liquid.

[0046] Furthermore, the present application also proposes an acid storage tank slag cleaning method applied to the acid storage tank slag cleaning system, including:

[0047] When starting the slag cleaning operation, open the first pipeline 8 and the third pipeline 10. The acid liquid flows from the acid storage tank 1 into the intermediate tank 5. Subsequently, use the acid pumping device 11 to flush the bottom of the tank with the acid liquid entering the acid storage tank 1 through the third pipeline 10. After the flushing is completed, let it stand still until the acid slag in the intermediate tank 5 sinks to the bottom. Then close the first pipeline 8. The acid liquid returns to the acid storage tank 1 through the third pipeline 10, and the acid slag is discharged through the slag discharge pipeline 7. Then close the third pipeline 10;

[0048] When not performing the slag cleaning operation, close the first pipeline 8 and the third pipeline 10, and open the second pipeline 9. The acid liquid flows from the acid storage tank 1 into the acid using device 13 and is circulated and heated through the fourth pipeline 12 and the fifth pipeline 15. When the acid liquid heating is completed, open the acid using valve 14 of the fourth pipeline 12, and the acid liquid flows into the acid using device 13.

[0049] It can be understood that the cleaning process is specifically as follows: When the thickness of the acid slag exceeds the cleaning threshold, the system opens the first pipeline 8. The acid liquid enters the intermediate tank 5 through this path, and then is pumped back to the acid storage tank 1 through the third pipeline 10 to flush the bottom of the tank. After the flushing is completed, the system stands still to let the acid slag precipitate, and then the sediment is discharged through the slag discharge pipeline 7.

[0050] In this preferred embodiment, the control unit 17 controls the opening and closing of different valves in the first pipeline 8, the second pipeline 9, the third pipeline 10, and the fourth pipeline 12 according to the thickness of the acid slag, which specifically includes:

[0051] There is set an acid slag thickness cleaning threshold and an acid slag thickness initial threshold. The acid slag thickness cleaning threshold is greater than the acid slag thickness initial threshold. When the acid slag thickness exceeds the acid slag thickness cleaning threshold, it is judged that slag cleaning operation is required. Open the first pipeline 8. The acid liquid flows from the acid storage tank 1 into the intermediate tank 5. Subsequently, the acid liquid enters the acid storage tank 1 through the third pipeline 10 and flushes the bottom of the tank. After the flushing is completed, let it stand still until the acid slag in the intermediate tank 5 sinks to the bottom. Then close the first pipeline 8. The acid liquid returns to the acid storage tank 1 through the third pipeline 10, and the acid slag is discharged through the slag discharge pipeline 7. Then close the third pipeline 10;

[0052] When the acid slag thickness is lower than the acid slag thickness initial threshold, it is judged that the slag cleaning operation is completed. Close the first pipeline 8 and the third pipeline 10, and open the second pipeline 9. The acid liquid flows from the acid storage tank 1 into the acid using device 13 and is circulated and heated through the fourth pipeline 12 and the fifth pipeline 15. When the heating and acid cleaning are completed, open the third pipeline 10 to pump the acid liquid back to the acid storage tank 1.

[0053] It can be understood that the acid tank slag removal system optimizes the maintenance and management process of the acid storage tank through a series of automated operations and intelligent control. The liquid level meter 4 and the acquisition unit 16 are used to monitor the acid slag thickness in real time, and automatically determine when the slag removal operation is required. Specifically, the acquisition unit 16 can be an image acquisition device. By opening a window or replacing the part of the acid storage tank 1 corresponding to the acquisition unit 16 with a transparent material, the acid slag at the bottom of the acid storage tank 1 can be recorded, analyzed and detected to obtain the acid slag thickness; the acquisition unit 16 can also be an ultrasonic sensor, and the acid slag thickness is determined by analyzing the ultrasonic historical data reflected back. According to the thickness of the acid slag, different pipeline valves are automatically opened or closed to ensure the optimization of the acid flow path. The acid is circulated and heated in the intermediate tank 5 to improve the slag removal effect and maintain the acid state during the non-slag removal operation. According to different acid slag thickness levels, the speed of the lifting pump is adjusted to ensure efficient slag removal and save energy.

[0054] In this preferred embodiment, the control unit 17 is also electrically connected to the acid extraction device 11, and the speed of the booster pump in the acid extraction device 11 is controlled according to the thickness of the acid slag, specifically including:

[0055] The acid slag thickness is further divided into the first acid slag thickness, the second acid slag thickness and the third acid slag thickness, and the initial threshold of the acid slag thickness is less than the first acid slag thickness, less than the second acid slag thickness, less than the third acid slag thickness, and less than the acid slag thickness cleaning threshold. The speed of the lifting pump is divided into the first speed, the second speed, the third speed and the fourth speed, and the first speed is less than the second speed, less than the third speed, and less than the fourth speed. The lifting pump speed is determined according to the relationship between the current acid slag thickness and the initial threshold of the acid slag thickness, the first acid slag thickness, the second acid slag thickness, the third acid slag thickness and the acid slag thickness cleaning threshold.

[0056] In this preferred embodiment, determining the boost pump speed according to the relationship between the current acid slag thickness and the initial acid slag thickness threshold, the first acid slag thickness, the second acid slag thickness, the third acid slag thickness and the acid slag thickness cleaning threshold specifically includes:

[0057] When the current acid slag thickness is greater than or equal to the initial acid slag thickness threshold and less than the first acid slag thickness, the lift pump selects the first speed; when the current acid slag thickness is greater than or equal to the first acid slag thickness and less than the second acid slag thickness, the lift pump selects the second speed; when the current acid slag thickness is greater than or equal to the second acid slag thickness and less than the third acid slag thickness, the lift pump selects the third speed; when the current acid slag thickness is greater than or equal to the third acid slag thickness and less than the acid slag cleaning threshold, the lift pump selects the fourth speed. The intelligent control strategy not only improves the flexibility and response speed of the system, but also optimizes energy consumption and ensures optimal operating efficiency under different working conditions. By automatically adjusting the speed of the lift pump and the state of the pipeline valve, the system can provide more efficient and economical slag cleaning services.

[0058] It is understandable that the acid tank slag removal method is a method applied to the above-mentioned acid tank slag removal system. When the slag removal operation starts, the first pipeline 8 is opened to allow the acid liquid to flow from the acid tank 1 into the intermediate tank 5, and then the acid liquid enters the acid tank 1 through the acid extraction device 11 and the third pipeline 10, and cleans the tank bottom. After the flushing is completed, it is left to stand until the acid slag settles to the bottom. After closing the first pipeline 8, the acid liquid flows back to the acid tank 1 through the third pipeline 10, and the acid slag is discharged through the slag discharge pipeline 7. When the slag removal operation is not performed, the first pipeline 8 and the third pipeline 10 are closed, and the second pipeline 9 is opened to allow the acid liquid to flow from the acid tank 1 into the acid device 13, and circulate and heat through the fourth pipeline 12 and the fifth pipeline 15. After the heated pickling is completed, the third pipeline 10 is opened to return the acid liquid to the acid tank 1. The control unit 17 controls the opening and closing of the valve and the speed of the lifting pump according to the change in the thickness of the acid slag. Different operation modes and speeds are selected according to the relationship between the thickness of the acid slag and the threshold. The acid storage tank slag cleaning system and method can effectively process the acid slag generated during the acid storage process, and realize automatic control, thereby improving work efficiency and safety.

[0059] In summary, the acid storage tank slag removal system is a system for treating the acid slag generated when storing acid liquid. It includes components such as an acid storage tank 1, an intermediate tank 5, multiple pipelines and a control unit 17. The top of the acid storage tank 1 is provided with a breathing port 2 and an air inlet 3 for circulating the acid mist in the acid storage tank 1. The side wall of the acid storage tank 1 is connected with a liquid level meter 4 for monitoring the liquid level of the acid liquid. A heat exchanger 6 is provided inside the intermediate tank 5 for heating the acid liquid. A slag discharge pipeline 7 is provided at the bottom of the intermediate tank 5 for discharging the acid slag. The first pipeline 8 in the system connects the side wall of the acid storage tank 1 and the intermediate tank 5. The second pipeline 9 connects the acid storage tank 1 and the acid device 13. The third pipeline 10 connects the bottom of the side wall of the intermediate tank 5 and the side wall of the acid storage tank 1, and is connected with an acid extraction device 11 for extracting the acid liquid from the intermediate tank 5 back to the acid storage tank 1. The connection point of the third pipeline 10 with the acid storage tank 1 is higher than the connection point of the second pipeline 9 with the acid storage tank 1 to keep the acid liquid flowing in the system. In addition to the above components, the system also includes a fourth pipeline 12, which is a three-way pipeline, one end of which is connected to the acid storage tank 1, and the other two ports are respectively connected to the side wall of the intermediate pool 5 and the acid device 13. . The fifth pipeline 15 connects the acid device 13 and the inside of the intermediate pool 5. A collection unit 16 is provided at the bottom of the liquid level meter 4 for collecting the thickness of the acid slag. The collection unit 16 is electrically connected to the control unit 17, and the control unit 17 controls the opening and closing of the valves in different pipelines according to the thickness of the acid slag, and controls the speed of the lifting pump in the acid extraction device 11. At least one concentrated acid port 18 is also connected to the top of the acid storage tank 1 for increasing the concentration of the acid solution. A baffle is provided at the connection between the first pipeline 8 and the inner side of the intermediate pool 5 for guiding the flow of the acid solution. The acid storage tank slag cleaning method is a method applied to the above-mentioned acid storage tank slag cleaning system. When the slag cleaning operation starts, the first pipeline 8 is opened to allow the acid solution to flow from the acid storage tank 1 into the intermediate pool 5, and then the acid solution enters the acid storage tank 1 through the third pipeline 10, and cleans the bottom of the tank. After the flushing is completed, it is left to stand until the acid slag settles to the bottom. After closing the first pipeline 8, the acid liquid flows back to the acid storage tank 1 through the third pipeline 10, and the acid slag is discharged through the slag discharge pipeline 7. When the slag removal operation is not performed, the first pipeline 8 and the third pipeline 10 are closed, and the second pipeline 9 is opened to allow the acid liquid to flow from the acid storage tank 1 into the acid using device 13, and circulate and heat through the fourth pipeline 12 and the fifth pipeline 15. After the heated pickling is completed, the third pipeline 10 is opened and returned to the acid storage tank 1. The control unit 17 controls the opening and closing of the valve and the speed of the booster pump according to the change in the thickness of the acid slag. Different operating modes and speeds are selected according to the relationship between the thickness of the acid slag and the threshold value. This acid storage tank slag removal system and method can effectively handle the acid slag generated during the acid storage process, and realize automatic control, thereby improving work efficiency and safety.

[0060] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the present invention can still be modified or replaced by equivalents. Any modification or equivalent replacement that does not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A slag removal system for an acid storage tank, characterized in that: include: The acid storage tank has a breathing port and an air inlet on the top thereof, and the breathing port and the air inlet are used to circulate the acid mist in the acid storage tank; The side wall of the acid storage tank is connected to a liquid level gauge; a collection unit is provided at the bottom of the liquid level gauge, and the collection unit is configured to collect the thickness of the acid slag. The collection unit is electrically connected to a control unit, and the control unit controls the opening and closing of different valves in the first pipeline, the second pipeline, the third pipeline, and the fourth pipeline according to the thickness of the acid slag; The control unit is also electrically connected to the acid extraction device, and controls the rotation speed of the booster pump in the acid extraction device according to the thickness of the acid slag; The middle tank has a heat exchanger disposed inside thereof, and the heat exchanger is used to heat the acid liquid. A slag discharge pipe is disposed at the bottom of the middle tank. The heat exchanger heats the acid liquid to improve the cleaning efficiency and reaction rate. A first pipeline, whose two ends are respectively connected to the bottom of the acid storage tank and the side wall of the intermediate tank; a second pipeline, whose two ends are respectively connected to the side wall of the acid storage tank and a fourth pipeline; a third pipeline, whose two ends are respectively connected to the bottom of the side wall of the intermediate tank and the side wall of the acid storage tank, an acid extraction device is connected to the third pipeline, and the acid extraction device is used to pump acid from the intermediate tank into the acid storage tank; a fourth pipeline, whose two ends are connected to the intermediate tank and an acid using device; a connection point between the third pipeline and the acid storage tank is higher than a connection point between the second pipeline and the acid storage tank; and further comprising: The fourth pipeline is a three-way pipeline, two ports of which are respectively connected to the side wall of the intermediate tank and the acid device, and the other port is connected to the second pipeline through an acid valve; and further includes: A fifth pipeline, one end of which is connected to the acid-using device, and the other end of which is inserted into the interior of the intermediate tank.

2. The acid storage tank slag cleaning system according to claim 1, characterized in that: The top of the acid storage tank is connected with at least one concentrated acid port for increasing the concentration of the acid solution.

3. The acid storage tank slag cleaning system according to claim 2, characterized in that: A blocking plate is provided at the connection between the first pipeline and the inner side of the intermediate pool.

4. A method for cleaning slag from an acid storage tank, applied to the acid storage tank cleaning system according to any one of claims 1 to 3, characterized in that: include: When the slag cleaning operation starts, the first pipeline and the third pipeline are opened, and the acid liquid flows from the acid storage tank into the intermediate tank, and then the acid liquid entering the acid storage tank washes the tank bottom. After the washing is completed, the acid residue in the intermediate tank is allowed to settle to the bottom, and the first pipeline is closed. The acid liquid returns to the acid storage tank through the third pipeline, and the acid residue is discharged through the slag discharge pipeline, and the third pipeline is closed; When the slag cleaning operation is not performed, the first pipeline and the third pipeline are closed, and the acid flows from the acid storage tank through the second pipeline into the acid using device, and the fourth pipeline and the fifth pipeline are opened for circulating heating pickling. When the pickling is completed, the third pipeline is opened to return the acid to the acid storage tank.

5. A method for cleaning slag from an acid storage tank according to claim 4, characterized in that: The control unit controls the opening and closing of different valves in the first pipeline, the second pipeline, the third pipeline and the fourth pipeline according to the thickness of the acid slag, specifically including: An acid slag thickness cleaning threshold and an acid slag thickness initial threshold are provided, the acid slag thickness cleaning threshold is greater than the acid slag thickness initial threshold, when the acid slag thickness exceeds the acid slag thickness cleaning threshold, it is determined that slag cleaning is required, the first pipeline and the third pipeline are opened, the acid liquid flows from the acid storage tank into the intermediate tank and enters the acid storage tank through the third pipeline and rinses the tank bottom, after the rinsing is completed, the acid slag in the intermediate tank is allowed to settle to the bottom, the first pipeline is closed, the acid liquid returns to the acid storage tank through the third pipeline, the acid slag is discharged through the slag discharge pipeline, and the third pipeline is closed; When the acid slag thickness is lower than the initial threshold value of the acid slag thickness, it is determined that the slag cleaning operation is completed, the first pipeline and the third pipeline are closed, the second pipeline is opened, and the acid flows from the acid storage tank through the second pipeline into the acid using device. The fourth pipeline and the fifth pipeline are opened for circulating heating pickling. When the pickling is completed, the third pipeline is opened to return the acid to the acid storage tank.

6. A method for cleaning slag from an acid storage tank according to claim 5, characterized in that: The control unit is also electrically connected to the acid extraction device, and controlling the rotation speed of the booster pump in the acid extraction device according to the thickness of the acid slag specifically includes: The acid slag thickness is further divided into a first acid slag thickness, a second acid slag thickness and a third acid slag thickness, and the initial threshold of the acid slag thickness is less than the first acid slag thickness, less than the second acid slag thickness, less than the third acid slag thickness, less than the acid slag thickness cleaning threshold, and the speed of the lifting pump is divided into a first speed, a second speed, a third speed and a fourth speed, and the first speed is less than the second speed, less than the third speed, less than the fourth speed; the lifting pump speed is determined according to the relationship between the current acid slag thickness and the initial threshold of the acid slag thickness, the first acid slag thickness, the second acid slag thickness, the third acid slag thickness and the acid slag thickness cleaning threshold.

7. A method for cleaning slag from an acid storage tank according to claim 6, characterized in that: Determining the lift pump speed according to the relationship between the current acid slag thickness and the acid slag thickness initial threshold, the first acid slag thickness, the second acid slag thickness, the third acid slag thickness and the acid slag thickness cleaning threshold specifically includes: When the current acid slag thickness is greater than or equal to the initial threshold of acid slag thickness and less than the first acid slag thickness, the lifting pump selects the first speed; when the current acid slag thickness is greater than or equal to the first acid slag thickness and less than the second acid slag thickness, the lifting pump selects the second speed; when the current acid slag thickness is greater than or equal to the second acid slag thickness and less than the third acid slag thickness, the lifting pump selects the third speed; when the current acid slag thickness is greater than or equal to the third acid slag thickness and less than the acid slag thickness cleaning threshold, the lifting pump selects the fourth speed.

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