Slurry storage and circulation system and descaling method therefor

Abstract

A slurry storage and circulation system (100) and a descaling method on the basis of the slurry storage and circulation system (100). The slurry storage and circulation system (100) comprises: a slurry tank body (10); a slurry pipe (20), connected to an output end of the slurry tank body (10); a thickness sensor (30), arranged on the inner wall of one of the slurry tank body (10) or the slurry pipe (20), and configured to measure a scaling thickness on the corresponding inner wall and output thickness data; a first cleaning solution tank (40), storing a first cleaning solution, the first cleaning solution tank (40) being communicated with the slurry tank body (10) or the slurry pipe (20) corresponding to the thickness sensor (30); a second cleaning solution tank (50), storing a second cleaning solution, the second cleaning solution tank (50) being communicated with the slurry tank body (10) or the slurry pipe (20) corresponding to the thickness sensor (30), and a descaling effect of the second cleaning solution being greater than a descaling effect of the first cleaning solution; and a controller, receiving thickness data of the thickness sensor (30), and on the basis of the thickness data, controlling the first cleaning solution tank (40) to output the first cleaning solution or the second cleaning solution tank (50) to output the second cleaning solution.

Description

A slurry storage and circulation system and descaling method thereof Technical Field

[0001] The present invention relates to the field of battery manufacturing, and more specifically, to a slurry storage and circulation system and a descaling method thereof in battery manufacturing. Background Art

[0002] With the development of science and technology, the application of electronic devices is becoming more and more extensive, especially the application scenarios of mobile electronic devices are becoming more and more diverse. Almost all mobile electronic devices are inseparable from the use of batteries. The research and development of battery technology is receiving increasing attention, and battery manufacturing technology is the core of the industry.

[0003] Lithium iron phosphate (LIFP) batteries, for example, are a common type of battery. Their excellent cycle performance, high safety, and environmental friendliness have made them a mainstream option in the current new energy industry. Currently available technologies for preparing LFP are primarily categorized into high-temperature solid-phase methods, carbothermal reduction methods, and hydrothermal methods. The high-temperature solid-phase method produces uneven phases, while the hydrothermal method requires high-temperature, high-pressure equipment, resulting in high equipment costs. Currently, the carbothermal reduction method is the primary method used for mass production of LFP.

[0004] In the existing process, the following defects and shortcomings exist in the slurry stages of premixing, grinding and spraying: scaling is easy to form in slurry pipes and tanks, the element ratio of the materials in the scale is unbalanced, and magnetic substances are easily generated when mixed into the slurry; the degree of automation is insufficient and the pipes and tanks are difficult to clean, requiring high-pressure water gun flushing and manual scraping; there are risks when manually entering the tank to clean the dirt.

[0005] Summary of the Invention

[0006] In light of the above, the present invention aims to address at least one of the technical problems existing in the prior art. To this end, the present invention provides a slurry storage and circulation system and a descaling method therefor. The slurry storage and circulation system provided by the present invention can automatically and intelligently prevent scaling on the inner walls of slurry equipment, thereby preventing the adverse effects on the stability of slurry composition.

[0007] To this end, in a first aspect, an embodiment of the present invention provides a slurry storage and circulation system, the slurry storage and circulation system comprising:

[0008] At least one slurry tank;

[0009] at least one slurry pipeline, the slurry pipeline being connected to the output end of the slurry tank;

[0010] At least one thickness sensor, disposed on the inner wall of one of the slurry tank or the slurry pipeline, for detecting the thickness of the scaling on the corresponding inner wall and outputting thickness data;

[0011] a first washing liquid tank storing a first washing liquid, wherein the first washing liquid tank is connected to the slurry tank or the slurry pipeline corresponding to the thickness sensor;

[0012] a second washing liquid tank storing a second washing liquid, the second washing liquid tank being connected to the slurry tank body or the slurry pipeline corresponding to the thickness sensor, wherein the descaling effect of the second washing liquid is greater than that of the first washing liquid;

[0013] A controller receives thickness data from the thickness sensor and controls the first washing liquid tank to output the first washing liquid or the second washing liquid tank to output the second washing liquid according to the thickness data.

[0014] Preferably, the thickness sensor is arranged on the inner wall of the slurry tank body, and the slurry storage and circulation system also includes a movable annular sprayer arranged on the slurry tank body, the movable annular sprayer receives the first washing liquid or the second washing liquid, and the movable annular sprayer is controlled by the controller.

[0015] Preferably, the first washing liquid tank outputs the first washing liquid through a first valve, the second washing liquid tank outputs the second washing liquid through a second valve, the first washing liquid and the second washing liquid are connected to the movable annular sprayer, the first washing liquid and the second washing liquid are connected to the slurry pipeline through a third valve, and the first valve, the second valve and the third valve are controlled by the controller.

[0016] Preferably, the slurry storage and circulation system also includes a weight sensor arranged at the bottom of the slurry tank body, and the weight sensor is used to detect the weight of the corresponding slurry tank body and output weight data. The controller receives the weight data of the weight sensor and controls the thickness sensor to start detection according to the weight data.

[0017] Preferably, it further comprises a sewage pipe, wherein the sewage pipe is connected to the slurry pipe through a fourth valve, and the fourth valve is controlled by the controller.

[0018] Preferably, the number of thickness sensors arranged in the slurry pipe is at least two, and they are spaced apart from the proximal end to the distal end of the slurry pipe relative to the slurry tank.

[0019] Preferably, the slurry tank body includes a first tank body and a second tank body, and the slurry pipeline includes a first circulation pipeline, and the first circulation pipeline is connected to the output end of the first tank body and the input end of the second tank body.

[0020] Preferably, the first tank body is a premixing tank, the second tank body is a sand grinding tank, the slurry tank body also includes a spray slurry buffer tank, and the slurry pipeline also includes a second flow pipeline. The first flow pipeline connects the output end of the premixing tank and the input end of the sand grinding tank, and the second flow pipeline connects the output end of the sand grinding tank and the input end of the spray slurry buffer tank.

[0021] Preferably, a spray dryer is further included, and the slurry pipeline further includes a third circulation pipeline, and the third circulation pipeline is connected to the output end of the spraying slurry buffer tank and the input end of the spray dryer.

[0022] Preferably, the first washing liquid includes clean water, and the second washing liquid includes at least one of oxalic acid, phosphoric acid, and sulfuric acid; more preferably, the second washing liquid includes oxalic acid.

[0023] In a second aspect, an embodiment of the present invention further provides a descaling method for the slurry storage and circulation system provided in accordance with the first aspect, the descaling method comprising:

[0024] S1. Detecting the thickness of scale on the inner wall of a slurry tank, or detecting the thickness of scale on the inner wall of a slurry pipeline;

[0025] S2, determining whether the thickness data exceeds a preset value;

[0026] S3: If yes, output the first washing liquid to clean the corresponding slurry tank or slurry pipeline, and re-execute step S1 and step S2;

[0027] S4. If it is repeatedly determined that the thickness data exceeds the preset value, output a second washing liquid to clean the corresponding slurry tank or the slurry pipeline, wherein the descaling effect of the second washing liquid is greater than the descaling effect of the first washing liquid.

[0028] In a third aspect, an embodiment of the present invention further provides a descaling method for the slurry storage and circulation system according to the first aspect, the descaling method comprising:

[0029] S1', detecting the first thickness data of scaling on the inner wall of the slurry tank;

[0030] S2', determining whether the first thickness data exceeds a first preset value;

[0031] S3': If yes, output the first washing liquid to clean the corresponding slurry tank, and re-execute step S1' and step S2';

[0032] S4', if it is repeatedly determined that the first thickness data exceeds the first preset value, outputting a second washing liquid to clean the slurry tank; wherein the descaling effect of the second washing liquid is greater than the descaling effect of the first washing liquid;

[0033] S5', detecting the second thickness data of scaling on the inner wall of the slurry pipeline;

[0034] S6', determining whether the second thickness data exceeds a second preset value;

[0035] S7': If yes, output the first washing liquid to clean the slurry pipeline, and re-execute steps S5' and S6';

[0036] S8': if it is repeatedly determined that the second thickness data exceeds the second preset value, output a second washing liquid to clean the slurry pipeline.

[0037] Preferably, step S5', step S6', step S7' and step S8' are repeatedly performed at least twice, wherein, during each repetition, step S5' detects the second thickness data of scale at different positions on the inner wall of the slurry pipe; preferably, the order of repetition is performed according to the distance between the slurry pipe and the slurry tank body from far to near.

[0038] Preferably, before step S1 or step S1', the method further includes:

[0039] S0. Detect the weight data of the slurry tank and calculate the weight change data, and determine whether the weight change data exceeds a preset change value. If so, execute step S1 or step S1'.

[0040] Preferably, in step S3, step S3' or step S7', outputting the first washing liquid to clean the slurry pipeline specifically includes: outputting the first washing liquid to clean the corresponding slurry tank or slurry pipeline several times.

[0041] Preferably, in step S4, step S4' or step S8', if it is repeatedly determined that the thickness data exceeds the preset value, the second washing liquid is output to clean the slurry tank body, specifically including: if it is repeatedly determined that the thickness data exceeds the preset value, the second washing liquid is output to clean the slurry tank body until the scaling thickness data is detected to be less than the preset value.

[0042] In a fourth aspect, an embodiment of the present invention further provides a descaling method for the slurry storage and circulation system provided in accordance with the first aspect, the descaling method comprising:

[0043] S1”, detect the thickness data of the scale on the inner wall of the slurry tank, or detect the thickness data of the scale on the inner wall of the slurry pipeline;

[0044] S2”, determining whether the thickness data exceeds a preset value;

[0045] If yes, output the first washing liquid to clean the corresponding slurry tank or slurry pipeline, and re-execute step S1" and step S2" until it is determined that the thickness data does not exceed the preset value; or, repeat step S1" and step S2" for a preset number of times, and it is determined that the thickness data still exceeds the preset value;

[0046] S4": If yes, output a second washing liquid to clean the corresponding slurry tank or the slurry pipeline, wherein the descaling effect of the second washing liquid is greater than the descaling effect of the first washing liquid.

[0047] The slurry storage and circulation system provided in the embodiment of the present invention has a simple structure. By detecting the scale thickness on the inner wall of the slurry tank or slurry pipeline, it automatically controls the cleaning action, and sets a first washing liquid and a second washing liquid with different cleaning effects to clean the slurry tank or slurry pipeline. It can achieve good descaling effect and fully automated control, save resources, be suitable for large-scale application, and achieve cost reduction and efficiency improvement in production and manufacturing. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] FIG1 is a schematic diagram of the framework structure of a slurry storage and circulation system provided by a first embodiment of the present invention;

[0049] FIG2 is a schematic diagram of the framework structure of a slurry storage and circulation system provided by a second embodiment of the present invention;

[0050] FIG3 is a schematic diagram of the framework structure of a slurry storage and circulation system provided in a third embodiment of the present invention;

[0051] FIG4 is a flow chart of a descaling method for a slurry storage and circulation system provided in a fourth embodiment of the present invention;

[0052] FIG5 is a flow chart of a descaling method for a slurry storage and circulation system according to a fifth embodiment of the present invention;

[0053] FIG6 is a flow chart of a descaling method for a slurry storage and circulation system provided in a sixth embodiment of the present invention. DETAILED DESCRIPTION

[0054] The following describes embodiments of the present invention in detail, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and are not to be construed as limiting the present invention.

[0055] The disclosure below provides many different embodiments or examples for realizing different structures of the present invention. In order to simplify the disclosure of the present invention, the components and settings of specific examples are described below. Of course, they are merely examples and are not intended to limit the present invention. In addition, the present invention may repeat reference numbers and / or letters in different examples. This repetition is for the purpose of simplicity and clarity and does not in itself indicate the relationship between the various embodiments and / or settings discussed. In addition, the present invention provides examples of various specific processes and materials, but those skilled in the art will appreciate the applicability of other processes and / or the use of other materials.

[0056] Referring to FIG. 1 to FIG. 3 , an embodiment of the present invention provides a slurry storage and circulation system 100 , including:

[0057] At least one slurry tank 10;

[0058] At least one slurry pipe 20, the slurry pipe 20 is connected to the output end of the slurry tank 10;

[0059] At least one thickness sensor 30, provided on the inner wall of one of the slurry tank 10 or the slurry pipe 20, for detecting the scaling thickness of the corresponding inner wall and outputting thickness data;

[0060] A first washing liquid tank 40 stores a first washing liquid, and the first washing liquid tank 40 is connected to the slurry tank body 10 or the slurry pipeline 20 corresponding to the thickness sensor 30;

[0061] A second washing liquid tank 50 stores a second washing liquid. The second washing liquid tank 50 is connected to the slurry tank body 10 or the slurry pipeline 20 corresponding to the thickness sensor 30. The descaling effect of the second washing liquid is greater than that of the first washing liquid.

[0062] A controller (not shown) receives thickness data from the thickness sensor 30 and controls the first washing liquid tank 40 to output the first washing liquid or the second washing liquid tank 50 to output the second washing liquid according to the thickness data.

[0063] In this embodiment, the slurry tank body 10 is used to store slurry or perform a process flow. During this process, the slurry will form a certain amount of scale on the inner wall of the slurry tank body 10. When the structural thickness reaches a certain level, the scale may fall off and mix into the new slurry during subsequent storage and process flow, changing the element ratio of the new slurry, thereby affecting the normal progress of the process flow. Similarly, the slurry pipeline 20 is a way to transfer the slurry that has completed a certain process flow in the slurry tank body 10 to the next process step. The inner wall of the slurry pipeline 20 will also produce the same scaling problem as the inner wall of the slurry tank body 10. In this embodiment, the thickness sensor 30 detects the thickness data of the scale, and then automatically controls the use of the first washing liquid and the second washing liquid with different effects to clean the scaled area according to the thickness data, thereby realizing an efficient automatic descaling function. In addition, in this embodiment, the thickness sensor 30 specifically adopts an infrared detection sensor to perform infrared identification of the scale thickness on the inner wall and provide real-time feedback.

[0064] Further, referring to FIG1 , the thickness sensor 30 includes a first thickness sensor 31 disposed on the inner wall of the slurry tank 10 , and the slurry storage and circulation system 100 further includes a movable annular sprayer 60 disposed on the slurry tank 10 , the movable annular sprayer 60 receiving the first washing liquid or the second washing liquid, and the movable annular sprayer 60 is controlled by the controller. In this embodiment, for cleaning the slurry tank 10 , an adapted movable annular sprayer 60 is provided accordingly. Upon receiving a cleaning instruction, the movable annular sprayer 60 outputs the first washing liquid or the second washing liquid and moves up and down within the slurry tank 10 to fully clean the inner wall of the slurry tank 10 .

[0065] Furthermore, the first washing liquid tank 40 outputs the first washing liquid through the first valve 101, and the second washing liquid tank 50 outputs the second washing liquid through the second valve 102. The first washing liquid and the second washing liquid are connected to the movable annular sprayer 60, and the first washing liquid and the second washing liquid are connected to the slurry pipeline 20 through the third valve 103. The first valve 101, the second valve 102, and the third valve 103 are controlled by the controller. In this embodiment, by providing the first valve 101, the second valve 102, and the third valve 103, and all of them being controlled by the controller, automatic control of the output of the first washing liquid or the second washing liquid during the aforementioned cleaning operation is achieved.

[0066] Furthermore, the slurry storage and circulation system 100 further includes a weight sensor 70 provided at the bottom of the slurry tank 10. The weight sensor 70 is used to detect the weight of the corresponding slurry tank 10 and output weight data. The controller receives the weight data from the weight sensor 70 and controls the thickness sensor 30 to start detection according to the weight data. In this embodiment, by performing weight detection on the slurry tank 10, specifically, performing weight change detection on the slurry tank 10, for example, when the weight change between two weight detections reaches the weight of the process flow slurry, it indicates that the slurry tank 10 has completed the sequential slurry flow. At this time, it is the best time to perform detection and descaling without affecting the slurry process flow.

[0067] Furthermore, the slurry storage and circulation system 100 also includes a sewage pipe 80, which is connected to the slurry pipe 20 through a fourth valve 104, and the fourth valve 104 is controlled by the controller. In this embodiment, in the process of controlling the cleaning of the slurry tank body 10 or the slurry pipe 20, the first washing liquid or the second washing liquid that has completed cleaning is discharged through the sewage pipe 80. Specifically, the number of sewage pipes 80 is set to two, one of which is set at the output end near the slurry tank body 10, for discharging the waste liquid for cleaning the slurry tank body 10; the other is set at the end of the slurry pipe 20 away from the slurry tank body 10, for discharging the waste liquid for cleaning the slurry pipe 20.

[0068] Furthermore, the thickness sensor 30 includes a second thickness sensor 32 disposed in the slurry pipe 20. There are at least two second thickness sensors 32, spaced from the proximal end to the distal end of the slurry pipe 20 relative to the slurry tank 10. In this embodiment, since the slurry pipe 20 generally has a certain length and the degree of slurry scaling varies at different lengths, for example, the distal second thickness sensor 32 is activated first and automatically cleaned, simultaneously completing the cleaning of the proximal end. Theoretically, after the distal second thickness sensor 32 is activated, the proximal second thickness sensor 32 is activated. Since the detection and cleaning of the distal end also effectively cleans the proximal end, the thickness data detected by the proximal second thickness sensor 32 is likely to indicate that cleaning is not necessary. Alternatively, when the distal second thickness sensor 32 is activated and detects that the distal end does not require cleaning, this does not necessarily mean that cleaning of the proximal end is not necessary. In this case, the proximal second thickness sensor 42 should still be activated for detection and appropriate cleaning based on the detected thickness data to ensure overall descaling.

[0069] Further, please refer to Figure 2. The slurry tank body 10 of the slurry storage and circulation system 100 includes a first tank body 11 and a second tank body 12. The slurry pipeline 20 includes a first circulation pipeline 21. The first circulation pipeline 21 connects the output end of the first tank body 11 and the input end of the second tank body 12. In this embodiment, the slurry storage and circulation system 100 includes a first tank body 11, a second tank body 12, and a first circulation pipeline 21 connecting the first tank body 11 and the second tank body 12, realizing two slurry process flows and corresponding slurry circulation, and on this basis, further realizing automatic descaling of the equipment. In this embodiment, the first thickness sensor 31 of the thickness sensor 30 is correspondingly arranged on the inner walls of the first tank body 11 and the second tank body 12, and the second thickness sensor 32 of the thickness sensor 30 is correspondingly arranged on the inner wall of the first circulation pipeline 21.

[0070] Further, please refer to Figure 3, the first tank body 11 is a premixing tank, the second tank body 12 is a sanding tank, the slurry tank body 10 also includes a spray slurry buffer tank 13, and the slurry pipeline 20 also includes a second circulation pipeline 22. The first circulation pipeline 21 connects the output end of the premixing tank and the input end of the sanding tank, and the second circulation pipeline 22 connects the output end of the sanding tank and the input end of the spray slurry buffer tank 13. In this embodiment, the slurry storage and circulation system 100 specifically includes a premixing tank, a sanding tank and a spray slurry buffer tank 13, and accordingly, realizes the slurry process of premixing, sanding and spray slurry storage, and on this basis, further realizes the automatic descaling of the equipment. In this embodiment, the first thickness sensor 31 of the thickness sensor 30 is correspondingly arranged on the inner wall of the premixing tank, the sanding tank and the spray slurry buffer tank 13, and the second thickness sensor 32 of the thickness sensor 30 is correspondingly arranged on the inner wall of the first circulation pipeline 21 and the second circulation pipeline 22.

[0071] Furthermore, the slurry storage and circulation system 100 also includes a spray dryer 95, and the slurry pipeline 20 also includes a third circulation pipeline 23, and the third circulation pipeline 23 is connected to the output end of the spray slurry buffer tank 13 and the input end of the spray dryer 95. In this embodiment, the slurry storage and circulation system 100 specifically includes a premixing tank, a sand grinding tank, a spray slurry buffer tank 13 and a spray dryer 95, and accordingly, realizes the process flow of premixing, sand grinding and spray slurry storage and spray drying, and on this basis, further realizes the automatic descaling of the equipment. In this embodiment, the first thickness sensor 31 of the thickness sensor 30 is correspondingly arranged on the inner wall of the premixing tank, the sand grinding tank and the spray slurry buffer tank 13, and the second thickness sensor 32 of the thickness sensor 30 is correspondingly arranged on the inner wall of the first circulation pipeline 21, the second circulation pipeline 22 and the third circulation pipeline 23.

[0072] In the above-mentioned slurry storage and circulation system, during the slurry circulation process, the slurry is transferred from the premixing tank to the sand milling tank through the slurry pipe 20 by a homogenizing pump, and from the sand milling tank to the spray slurry buffer tank 13 through the slurry pipe 20 by a pneumatic diaphragm pump, and from the spray slurry buffer tank 13 to the spray dryer 95 through the slurry pipe 20 by a pneumatic diaphragm pump.

[0073] The following describes the working process of the slurry storage and circulation system 100 of this embodiment.

[0074] After each batch of materials is put into the premixing tank and premixing is completed, after the slurry is transferred to the sand milling tank, that is, after the weighing of the premixing tank shows that it is lower than a certain set weight (judging that the transfer of this batch of materials is completed), the tank inner wall scale thickness sensor 31 starts working first. After the detection value of the tank inner wall scale thickness sensor 31 is higher than the set value, the movable annular sprayer 60 starts to move vertically downward from the set height, spraying water (first washing liquid) while moving, stops spraying water after moving to the set end height, and then moves upward to its original position. This process is one cycle. After the water spraying cycle is repeated 3 times, if the scale thickness of the tank inner wall is not lower than the set value, oxalic acid (second washing liquid) is sprayed until the scale thickness of the tank inner wall is lower than the set value, and the inner wall scale cleaning is completed. In this process, water and oxalic acid solution are discharged from the sewage valve 80 (indirect flushing pipeline).

[0075] When the detection value of the scale thickness sensor 31 on the inner wall of the tank is lower than the set value, the scale thickness sensor 32 on the inner wall at the far end of the pipeline starts to work. When the detection value of the scale thickness sensor 32 on the inner wall of the pipeline is higher than the set value, the first valve 101, the sewage valve 90 and the pure water tank valve are automatically opened to start pure water flushing. If the scale on the inner wall of the pipeline is not lower than the set value after flushing three times, the oxalic acid solution valve is automatically opened, the pure water tank valve is closed, and oxalic acid cleaning is started until the detection value of the scale thickness sensor 32 on the inner wall of the pipeline is lower than the set value.

[0076] When the detection value of the inner wall scale thickness sensor 32 at the far end of the pipeline is lower than the set value, the inner wall scale thickness sensor 32 at the next far end of the pipeline starts to work, and the subsequent cleaning actions refer to the above steps and are not repeated here, until all the inner wall thickness sensors 32 of the pipeline have completed their work.

[0077] After the above steps, the premix tank to sand mill process flow, the premix tank body and the circulation pipeline are automatically cleaned. It is understood that the further automated cleaning process from the sand mill to the spray slurry buffer process, and the automated cleaning process from the spray slurry buffer to the spray dryer process are also based on the above principles and will not be repeated here.

[0078] Furthermore, the first washing liquid includes clean water, and the second washing liquid includes at least one of oxalic acid, phosphoric acid, and sulfuric acid; preferably, the second washing liquid includes oxalic acid. In this embodiment, the first washing liquid and the second washing liquid with graded cleaning effects are used to clean the slurry tank 10 and the slurry pipe 20 in a variety of cleaning modes. For example, clean water with lower cleaning effect is first used for cleaning, and then an acidic solution is used for cleaning when the clean water cleaning effect is not obvious. This ensures the effect of automatic descaling while saving resources.

[0079] Referring to FIG4 , an embodiment of the present invention further provides a descaling method according to the slurry storage and circulation system 100 , the descaling method comprising:

[0080] S1. Detecting the thickness of scale on the inner wall of a slurry tank, or detecting the thickness of scale on the inner wall of a slurry pipeline;

[0081] S2, determining whether the thickness data exceeds a preset value;

[0082] S3: If yes, output the first washing liquid to clean the corresponding slurry tank or slurry pipeline, and re-execute step S1 and step S2;

[0083] S4. If it is repeatedly determined that the thickness data exceeds the preset value, output a second washing liquid to clean the corresponding slurry tank or the slurry pipeline, wherein the descaling effect of the second washing liquid is greater than the descaling effect of the first washing liquid.

[0084] In this embodiment, based on the above-mentioned slurry storage and circulation system 100, an automated descaling control process is implemented. Specifically, according to the thickness data of the scaled area, when the thickness data meets the preset descaling thickness, that is, exceeds the preset value, it is determined that a descaling operation is required. The descaling operation first controls the output of the first washing liquid to clean the scaled area. After the cleaning action is completed, the thickness data of the scaled area is detected again. On the one hand, if the detected thickness data does not exceed the preset descaling thickness, that is, is lower than the preset value, it is determined that the descaling is completed and the operation can be stopped; on the other hand, if the detected thickness data still meets the preset descaling thickness, it is determined that further descaling operation is required. At this time, the second washing liquid is controlled to be output to clean the descaling area. Because the cleaning effect of the second washing liquid is higher than that of the first washing liquid, after these two rounds of cleaning operations, the descaling effect on the scaled area can be effectively guaranteed.

[0085] Referring to FIG5 , an embodiment of the present invention further provides another descaling method according to the slurry storage and circulation system 100 , the descaling method comprising:

[0086] S1', detecting the first thickness data of scaling on the inner wall of the slurry tank;

[0087] S2', determining whether the first thickness data exceeds a first preset value;

[0088] S3': If yes, output the first washing liquid to clean the corresponding slurry tank, and re-execute step S1' and step S2';

[0089] S4', if it is repeatedly determined that the first thickness data exceeds the first preset value, outputting a second washing liquid to clean the slurry tank; wherein the descaling effect of the second washing liquid is greater than the descaling effect of the first washing liquid;

[0090] S5', detecting the second thickness data of scaling on the inner wall of the slurry pipeline;

[0091] S6', determining whether the second thickness data exceeds a second preset value;

[0092] S7': If yes, output the first washing liquid to clean the slurry pipeline, and re-execute steps S5' and S6';

[0093] S8': if it is repeatedly determined that the second thickness data exceeds the second preset value, output a second washing liquid to clean the slurry pipeline.

[0094] In this embodiment, based on the above-mentioned slurry storage and circulation system 100, an automated descaling control process is implemented. Specifically, according to the thickness data of the scaled area, when the thickness data meets the preset descaling thickness, that is, exceeds the preset value, it is determined that a descaling operation is required. The descaling operation first controls the output of the first washing liquid to clean the scaled area. After the cleaning action is completed, the thickness data of the scaled area is detected again. On the one hand, if the detected thickness data does not exceed the preset descaling thickness, that is, is lower than the preset value, it is determined that the descaling is completed and the operation can be stopped; on the other hand, if the detected thickness data still meets the preset descaling thickness, it is determined that further descaling operations are required. At this time, the second washing liquid is controlled to be output to clean the descaling area, because the cleaning effect of the second washing liquid is higher than that of the first washing liquid. After these two rounds of cleaning operations, the descaling effect on the scaled area can be effectively guaranteed. The descaling method of this embodiment includes two groups of control steps for sequentially detecting and cleaning the slurry tank 10 and the slurry pipeline for scale, and each group of control steps is as described above.

[0095] Furthermore, the steps S5', S6', S7', and S8' are repeatedly performed at least twice, wherein, during each repetition, the step S5' detects the second thickness data of the scale at different positions on the inner wall of the slurry pipe; preferably, the order of repetition is performed according to the distance between the slurry pipe and the slurry tank body from far to near. In this embodiment, the descaling method repeats steps S5', S6', S7', and S8' at least twice, corresponding to the number of second thickness sensors 32 in the slurry pipe 20. Each repeated step is a detection and cleaning control process performed on one of the second thickness sensors 32. The working order of at least two second thickness sensors 32 is performed in sequence according to the distance from the slurry tank body 10 from the far end to the near end. This principle has been described in detail in the above content and will not be repeated here.

[0096] Further, referring to Figures 4 and 5, in the descaling method of the above two embodiments, before step S1 or step S1', the method further includes: S0, detecting the weight data of the slurry tank body and calculating the weight change data, determining whether the weight change data exceeds a preset change value, and if so, executing step S1 or step S1'. In this embodiment, by pre-detecting the weight change of the slurry tank body 10, it is determined that the slurry tank body 10 has completed the sequential slurry flow, and then determining the timing for descaling detection and cleaning to avoid adverse effects on the equipment process flow.

[0097] Furthermore, in step S3, step S3', or step S7', outputting the first washing liquid to clean the slurry pipe specifically includes outputting the first washing liquid to clean the corresponding slurry tank or slurry pipe several times. In this embodiment, it can be understood that because the first washing liquid is a washing liquid with low cleaning efficiency, such as water, when using the first washing liquid for cleaning, increasing the number of cleaning times to several times, such as 2 times, 3 times, 4 times, etc., can improve the corresponding descaling effect.

[0098] Furthermore, in step S4, step S4' or step S8', if it is repeatedly determined that the thickness data exceeds the preset value, the second washing liquid is output to clean the slurry tank body, specifically including: if it is repeatedly determined that the thickness data exceeds the preset value, the second washing liquid is output to clean the slurry tank body until the scale thickness data is detected to be less than the preset value. It can be understood that although the second washing liquid is a washing liquid with a strong cleaning effect, using a certain amount of the second washing liquid for cleaning can meet most of the descaling needs, but in practice there may still be a few cases where it is necessary to increase the cleaning amount or cleaning time. Therefore, in this embodiment, during the cleaning process of the second washing liquid, the thickness of the scale is still continuously detected, and the cleaning action of the second washing liquid is also continued until the scale thickness is reduced to below the preset value, thereby ensuring the descaling effect.

[0099] Referring to FIG. 6 , an embodiment of the present invention further provides another descaling method according to the above-mentioned slurry storage and circulation system, the descaling method comprising:

[0100] S1”, detect the thickness data of the scale on the inner wall of the slurry tank, or detect the thickness data of the scale on the inner wall of the slurry pipeline;

[0101] S2”, determining whether the thickness data exceeds a preset value;

[0102] If yes, output the first washing liquid to clean the corresponding slurry tank or slurry pipeline, and re-execute step S1" and step S2" until it is determined that the thickness data does not exceed the preset value; or, repeat step S1" and step S2" for a preset number of times, and it is determined that the thickness data still exceeds the preset value;

[0103] S4": If yes, output a second washing liquid to clean the corresponding slurry tank or the slurry pipeline, wherein the descaling effect of the second washing liquid is greater than the descaling effect of the first washing liquid.

[0104] In this embodiment, the difference from the aforementioned descaling method is that when the first washing liquid is selected for cleaning, the scale thickness is repeatedly detected after one cleaning is completed until the detected scale thickness is reduced to an allowable range, or the number of repeated cleanings reaches a preset number, such as 3 times, 4 times, 5 times, etc., and the scale thickness still does not decrease to the allowable range, and then the second washing liquid is used for strong descaling, which saves resources while ensuring the descaling effect.

[0105] In the aforementioned slurry storage and circulation system, the controller is specifically a programmable logic controller (PLC). The weight sensor, thickness sensor, homogenizing pump, pneumatic diaphragm pump, valves, and other components of the system are all automatically controlled by the PLC. The aforementioned descaling method is also automatically controlled by the PLC.

[0106] To sum up, the slurry storage and circulation system provided in the embodiment of the present invention has a simple structure. By detecting the scale thickness on the inner wall of the slurry tank or slurry pipeline, it automatically controls the cleaning action, and sets the first washing liquid and the second washing liquid with different cleaning effects to clean the slurry tank or slurry pipeline. It can achieve good descaling effect and fully automated control, save resources, be suitable for large-scale application, and achieve cost reduction and efficiency improvement in production and manufacturing.

[0107] In the description of this specification, the reference terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

[0108] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to the embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the claims and their equivalents.

Claims

1. A slurry storage and circulation system, characterized in that: The slurry storage and circulation system comprises: At least one slurry tank; At least one slurry pipeline, the slurry pipeline is connected to the output end of the slurry tank; At least one thickness sensor, disposed on the inner wall of one of the slurry tank or the slurry pipeline, for detecting the scaling thickness of the corresponding inner wall and outputting thickness data; a first washing liquid tank storing a first washing liquid, wherein the first washing liquid tank is connected to the slurry tank body or the slurry pipeline corresponding to the thickness sensor; a second washing liquid tank storing a second washing liquid, the second washing liquid tank being connected to the slurry tank body or the slurry pipeline corresponding to the thickness sensor, and the descaling effect of the second washing liquid being greater than the descaling effect of the first washing liquid; A controller receives thickness data from the thickness sensor and controls the first washing liquid tank to output the first washing liquid or the second washing liquid tank to output the second washing liquid according to the thickness data.

2. The slurry storage and circulation system according to claim 1, characterized in that: The thickness sensor is arranged on the inner wall of the slurry tank body, and the slurry storage and circulation system also includes a movable annular sprayer arranged on the slurry tank body, the movable annular sprayer receives the first washing liquid or the second washing liquid, and the movable annular sprayer is controlled by the controller.

3. The slurry storage and circulation system according to claim 2, characterized in that: The first washing liquid tank outputs the first washing liquid through the first valve, the second washing liquid tank outputs the second washing liquid through the second valve, the first washing liquid and the second washing liquid are connected to the movable annular sprayer, the first washing liquid and the second washing liquid are connected to the slurry pipeline through the third valve, and the first valve, the second valve and the third valve are controlled by the controller.

4. The slurry storage and circulation system according to claim 1, characterized in that: The slurry storage and circulation system also includes a weight sensor arranged at the bottom of the slurry tank body, and the weight sensor is used to detect the weight of the corresponding slurry tank body and output weight data. The controller receives the weight data of the weight sensor and controls the thickness sensor to start detection according to the weight data.

5. The slurry storage and circulation system according to claim 1, characterized in that: It also includes a sewage pipe, which is connected to the slurry pipe through a fourth valve, and the fourth valve is controlled by the controller.

6. The slurry storage and circulation system according to claim 1, characterized in that: The number of thickness sensors arranged in the slurry pipeline is at least two, and they are arranged at intervals from the proximal end to the distal end of the slurry pipeline relative to the slurry tank.

7. The slurry storage and circulation system according to claim 1, characterized in that: The slurry tank body includes a first tank body and a second tank body, and the slurry pipeline includes a first circulation pipeline, and the first circulation pipeline is connected with the output end of the first tank body and the input end of the second tank body.

8. The slurry storage and circulation system according to claim 7, characterized in that: The first tank body is a premixing tank, the second tank body is a sand grinding tank, the slurry tank body also includes a spray slurry buffer tank, and the slurry pipeline also includes a second flow pipeline. The first flow pipeline connects the output end of the premixing tank and the input end of the sand grinding tank, and the second flow pipeline connects the output end of the sand grinding tank and the input end of the spray slurry buffer tank.

9. The slurry storage and circulation system according to claim 8, characterized in that: It also includes a spray dryer, and the slurry pipeline also includes a third circulation pipeline, and the third circulation pipeline is connected to the output end of the spray slurry buffer tank and the input end of the spray dryer.

10. The slurry storage and circulation system according to claim 1, characterized in that: The first washing liquid includes clean water, and the second washing liquid includes at least one of oxalic acid, phosphoric acid and sulfuric acid; preferably, the second washing liquid includes oxalic acid.

11. A descaling method for a slurry storage and circulation system according to any one of claim 1, characterized in that: The descaling method comprises: S1. Detecting the thickness data of the scaling on the inner wall of the slurry tank, or detecting the thickness data of the scaling on the inner wall of the slurry pipeline; S2, determining whether the thickness data exceeds a preset value; S3, if yes, output the first washing liquid to wash the corresponding slurry tank or slurry pipeline, and re-execute step S1 and step S2; S4. If it is repeatedly determined that the thickness data exceeds the preset value, a second washing liquid is output to clean the corresponding slurry tank or the slurry pipeline, wherein the descaling effect of the second washing liquid is greater than the descaling effect of the first washing liquid.

12. A descaling method for a slurry storage and circulation system according to any one of claim 1, characterized in that: The descaling method comprises: S1', detecting the first thickness data of scaling on the inner wall of the slurry tank; S2', determining whether the first thickness data exceeds a first preset value; S3', if yes, output the first washing liquid to wash the corresponding slurry tank, and re-execute step S1' and step S2'; S4', if it is repeatedly determined that the first thickness data exceeds the first preset value, output a second washing liquid to wash the Slurry tank; wherein the descaling effect of the second washing liquid is greater than the descaling effect of the first washing liquid; S5', detecting the second thickness data of scaling on the inner wall of the slurry pipeline; S6', determining whether the second thickness data exceeds a second preset value; S7', if yes, output the first washing liquid to clean the slurry pipeline, and re-execute step S5' and step S6'; S8', if it is repeatedly determined that the second thickness data exceeds the second preset value, output a second washing liquid to clean the slurry pipeline.

13. The descaling method according to claim 12, wherein the steps S5', S6', S7' and S8' are repeatedly performed at least twice, wherein: During each repetition, step S5' detects the second thickness data of scale at different positions on the inner wall of the slurry pipeline; preferably, the repetition is performed in a sequence from far to near according to the distance between the slurry pipeline and the slurry tank.

14. The descaling method according to claim 11 or 12, characterized in that: Before the step S1 or the step S1', the method further includes: S0. Detect the weight data of the slurry tank and calculate the weight change data, and determine whether the weight change data exceeds a preset change value. If so, execute step S1 or step S1'.

15. The descaling method according to claim 11 or 12, characterized in that: In the step S3, the step S3' or the step S7', outputting the first washing liquid to clean the slurry pipeline specifically includes: outputting the first washing liquid to clean the corresponding slurry tank or slurry pipeline several times.

16. The descaling method according to claim 11 or 12, characterized in that: In step S4, step S4' or step S8', if it is repeatedly determined that the thickness data exceeds the preset value, a second washing liquid is output to clean the slurry tank body, which specifically includes: if it is repeatedly determined that the thickness data exceeds the preset value, a second washing liquid is output to clean the slurry tank body until the scaling thickness data is detected to be less than the preset value.

17. A descaling method for a slurry storage and circulation system according to any one of claims 1 to 10, characterized in that: The descaling method comprises: S1”, detect the thickness data of the scaling on the inner wall of the slurry tank, or detect the thickness data of the scaling on the inner wall of the slurry pipeline; S2”, judging whether the thickness data exceeds a preset value; S3”, if yes, output the first washing liquid to clean the corresponding slurry tank or slurry pipeline, and re-execute step S1” and step S2” until it is determined that the thickness data does not exceed the preset value; or, repeat the step S1” and step S2” for a preset number of times, and determine that the thickness data still exceeds the preset value; S4", if yes, output the second washing liquid to clean the corresponding slurry tank or slurry pipeline, wherein the The descaling effect of the second washing liquid is greater than the descaling effect of the first washing liquid.

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