Filter cake moisture content monitoring device, method, system, and suction filtration testing device

Abstract

This application provides a filter cake moisture content monitoring device, method, system, and filtration testing device, relating to the field of filter press monitoring technology. The filter cake moisture content monitoring device includes: a first particle size measurement unit, a first thickness visual recognition unit, and a first control unit. The device measures the first slurry particle size using the first particle size measurement unit, identifies the filter cake thickness of the target filter cake using the first thickness visual recognition unit, and then uses the first control unit to determine the filter cake moisture content corresponding to the target filter cake based on the first slurry particle size, filter cake thickness, preset filtration-related data, and a preset moisture content determination algorithm. This achieves real-time monitoring of the filter cake moisture content without contacting the filter cake, thus avoiding damage to its integrity and preventing the transport of filter cakes with high moisture content. This reduces pipeline blockage and improves system stability.

Description

Technical Field

[0001] This application belongs to the field of filter monitoring technology, specifically relating to a filter cake moisture content monitoring device, method, system, and vacuum filtration testing device. Background Technology

[0002] The rotary drum vacuum filter receives the slurry input from upstream, and the rotating drum sequentially completes four operations: slurry filtration, filter cake drying, filter cake unloading, and filter media regeneration. Because the rotary drum vacuum filter is a continuous filter, its upstream and downstream equipment generally employs continuous processing equipment to match its high-throughput slurry processing capacity.

[0003] In related technologies, when the viscosity and particle size of the slurry entering the filter fluctuate, the filter still carries out filtration according to the established filtration process parameters, which directly leads to excessive moisture content in the filter cake. High moisture content in the filter cake can easily cause pipeline blockage during transportation and greatly increase the load on downstream equipment. All of these problems reduce the stability of the system.

[0004] Therefore, in related technologies, filter cakes with high moisture content can cause pipeline blockage and reduce system stability during transportation, which requires further optimization. Summary of the Invention

[0005] The technical problem to be solved by this application is to address the above-mentioned deficiencies in the existing technology by providing a filter cake moisture content monitoring device, method, system, and vacuum filtration testing device. Using this filter cake moisture content monitoring device, the filter cake moisture content can be monitored in real time, avoiding the conveying of filter cakes with high moisture content, thereby reducing pipeline blockage and improving system stability.

[0006] In a first aspect, embodiments of this application provide a filter cake moisture content monitoring device, comprising: The system comprises a first particle size measurement unit, a first thickness visual recognition unit, and a first control unit; The first particle size measurement unit is placed in the slurry storage container upstream of the vacuum drum filter; The first control unit is connected to the first particle size measurement unit and the first thickness visual recognition unit respectively; The first thickness visual recognition unit is used to identify the thickness of the target filter cake and transmit the filter cake thickness to the first control unit; the target filter cake is located at the end of the filter cake dewatering zone of the vacuum drum filter; The first particle size measuring unit is used to measure the first particle size of the slurry in the slurry storage container and transmit the first particle size to the first control unit; The first control unit is used to determine the filter cake moisture content corresponding to the target filter cake based on the first slurry particle size, filter cake thickness, preset filtration-related data, and preset moisture content determination algorithm; the preset filtration-related data is related to the vacuum drum filter.

[0007] In some embodiments of the first aspect, the first particle size measuring unit is an online particle size measuring instrument; The first thickness visual recognition unit is a visual recognition camera; A visual recognition camera is used to photograph the target filter cake in order to identify the thickness of the target filter cake.

[0008] In some embodiments of the first aspect, the preset filtration-related data includes: a first preset filter medium surface area and a first slurry solid content; the first preset filter medium surface area corresponds to the filter component in the vacuum drum filter; the first slurry solid content is the slurry solid content of the filter component in the vacuum drum filter. When determining the filter cake moisture content corresponding to the target filter cake based on the first slurry particle size, filter cake thickness, preset filtration-related data, and preset moisture content determination algorithm, it is specifically used for: Calculate the product of the filter cake thickness and the surface area of ​​the first preset filter medium to generate the filter cake volume; Calculate the quotient between the solid content of the first slurry and the volume of the filter cake to generate the corresponding filter cake density; Input the filter cake density and the first slurry particle size into the preset moisture content determination algorithm to generate the corresponding filter cake moisture content.

[0009] In some embodiments of the first aspect, the first control unit is further configured to: The first slurry solid content is calculated based on the slurry flow rate, the second slurry solid content, and the rotational speed of the vacuum drum filter; the slurry flow rate and the second slurry solid content are related to the slurry flowing into the vacuum drum filter from the slurry storage container.

[0010] Based on the same inventive concept, in a second aspect, embodiments of this application also provide a method for monitoring filter cake moisture content, based on any of the filter cake moisture content monitoring devices of the first aspect, wherein the method is applied to a first control unit in the filter cake moisture content monitoring device, and the method includes: The system receives the first slurry particle size transmitted by the first particle size measurement unit; the first slurry particle size is generated by the first particle size measurement unit in the slurry storage container; the slurry storage container is located upstream of the vacuum drum filter. The filter cake thickness is received from the first thickness visual recognition unit; the filter cake thickness is generated after the first thickness visual recognition unit performs thickness recognition on the target filter cake; the target filter cake is located at the end of the filter cake dewatering zone of the vacuum drum filter. The filter cake moisture content corresponding to the target filter cake is determined based on the first slurry particle size, filter cake thickness, preset filtration-related data, and preset moisture content determination algorithm; the preset filtration-related data is related to the vacuum drum filter.

[0011] In some embodiments of the second aspect, the preset filtration-related data includes: a first preset filter medium surface area and a first slurry solid content; the first preset filter medium surface area corresponds to the filter component in the vacuum drum filter; the first slurry solid content is the slurry solid content of the filter component in the vacuum drum filter. The filter cake moisture content corresponding to the target filter cake is determined based on the first slurry particle size, filter cake thickness, preset filtration-related data, and a preset moisture content determination algorithm, including: Calculate the product of the filter cake thickness and the surface area of ​​the first preset filter medium to generate the filter cake volume; Calculate the quotient between the solid content of the first slurry and the volume of the filter cake to generate the corresponding filter cake density; Input the filter cake density and the first slurry particle size into the preset moisture content determination algorithm to generate the corresponding filter cake moisture content.

[0012] In some embodiments of the second aspect, the method further includes: The first slurry solid content is calculated based on the slurry flow rate, the second slurry solid content, and the rotational speed of the vacuum drum filter; the slurry flow rate and the second slurry solid content are related to the slurry flowing into the vacuum drum filter from the slurry storage container.

[0013] Based on the same inventive concept, in a third aspect, embodiments of this application also provide a filter cake moisture content monitoring system, including: a vacuum drum filter, a slurry storage container, and a filter cake moisture content monitoring device as described in any of the first aspects; The slurry storage container is connected to the vacuum drum filter; The slurry storage container is used to store the slurry and transfer it to a vacuum drum filter for filtration to produce the target filter cake. The filter cake moisture content monitoring device is used to measure the first slurry particle size in the slurry storage container and to identify the filter cake thickness of the target filter cake; The filter cake moisture content monitoring device is also used to determine the filter cake moisture content corresponding to the target filter cake based on the first slurry particle size, filter cake thickness, preset filtration-related data, and preset moisture content determination algorithm; the preset filtration-related data is related to the vacuum drum filter.

[0014] Based on the same inventive concept, in a fourth aspect, embodiments of this application also provide a filtration testing device, including: a slurry generation measurement unit, a filtration measurement unit, a second particle size measurement unit, a second thickness visual recognition unit, and a second control unit; The slurry generation measurement unit is connected to the filtration measurement unit; The second control unit is connected to the slurry generation measurement unit, the filtration measurement unit, the second particle size measurement unit, and the second thickness visual recognition unit, respectively. The slurry generation and measurement unit is used to generate and measure the first weight of the raw slurry, transmit the first weight to the second control unit, and flow the test slurry into the filtration and measurement unit; the test slurry is part or all of the raw slurry. The vacuum filtration measurement unit is used to perform vacuum filtration on the test slurry to generate an initial filter cake and a filtrate after filtration. It measures the weight change data of the test filter cake before and after drying, as well as the second weight of the filtrate, and transmits the weight change data and the second weight to the second control unit. The test filter cake is part or all of the initial filter cake. The second particle size measurement unit is used to measure the second particle size of the original slurry. The second thickness visual recognition unit is used to identify the thickness of the initial filter cake and transmit the thickness to the second control unit; The second control unit is used to construct a preset moisture content determination algorithm based on the first weight, the second weight, weight change data, thickness, the surface area of ​​the second preset filter medium, and the second slurry particle size.

[0015] In some embodiments of the fourth aspect, the slurry generation measurement unit includes: a slurry generation module and a slurry storage measurement module; The inlet ends of the slurry generation module and the slurry storage and measurement module are connected; The outlet end of the slurry storage measurement module is connected to the filtration measurement unit; The slurry generation module is used to generate raw slurry and transport the raw slurry to the slurry storage and measurement module; The slurry storage and measurement module is used to store the raw slurry delivered by the slurry generation module, deliver the test slurry to the filtration and measurement unit, and also to measure the first weight of the stored raw slurry and transmit the first weight to the second control unit.

[0016] In some embodiments of the fourth aspect, the slurry generation module includes: a sedimentation reaction raw material storage tank, a peristaltic pump, a hose, a sedimentation reaction vessel, and a stirrer; The outlet of the precipitation reaction raw material storage tank is connected in sequence to the peristaltic pump and the inlet of the precipitation reaction vessel via a hose; the overflow outlet of the precipitation reaction vessel is connected to the inlet of the slurry storage and measurement module. The raw material storage tank for the precipitation reaction uses a peristaltic pump to transport the slurry raw material to the precipitation reaction vessel; A stirrer is used to stir the slurry raw material flowing into the sedimentation reaction vessel to generate the original slurry; The sedimentation reaction vessel delivers the raw slurry to the slurry storage and measurement module through the overflow outlet; The second particle size measuring unit is suspended in the sedimentation reaction vessel to measure the second particle size of the original slurry in the sedimentation reaction vessel.

[0017] In some embodiments of the fourth aspect, the slurry storage measurement module includes: a slurry storage tank, a slurry weighing scale, a valve, and a slurry nozzle; The upper interface of the slurry storage tank is connected to the overflow outlet of the sedimentation reaction vessel; The lower end interface of the slurry storage tank is connected to the slurry nozzle via a valve; The slurry storage tank is placed on the slurry weighing scale; Slurry storage tanks are used to store the raw slurry transported from sedimentation reaction vessels; Valves are used to control the on / off state of the flow path between the slurry storage tank and the slurry nozzle; The slurry nozzle is used to deliver the test slurry to the filtration measurement unit; The slurry weighing scale is used to measure the initial weight of the raw slurry stored in the slurry storage tank and transmit the initial weight to the second control unit.

[0018] In some embodiments of the fourth aspect, the filtration measurement unit includes a vacuum filtration module, a filtrate storage tank, a filtrate weighing scale, and a drying measurement module. The slurry inlet end of the vacuum filtration module corresponds to the slurry nozzle, and the filtrate outlet end of the vacuum filtration module is connected to the lower interface of the filtrate storage tank. The upper interface of the filtrate storage tank is connected to the negative pressure supply end of the vacuum filtration module; The filtrate storage tank is placed on the filtrate weighing scale; The drying measurement module is connected to the second control unit; The filtrate storage tank is used to store the filtrate generated after the vacuum filtration module filters the test slurry; The filtrate weighing scale is used to measure the second weight of the filtrate stored in the filtrate storage tank and transmit the second weight to the second control unit; The second thickness visual recognition unit is used to identify the thickness of the initial filter cake generated by the vacuum filtration module and transmit the thickness to the second control unit; The drying measurement module is used to dry the test filter cake, measure the weight change data of the test filter cake before and after drying, and transmit the weight change data to the second control unit.

[0019] In some embodiments of the fourth aspect, the vacuum filtration module includes: a vacuum filtration stand, a negative pressure buffer tank, and a negative pressure source; The vacuum filtration platform is placed directly below the slurry nozzle, and the lower interface of the vacuum filtration platform is connected to the lower interface of the filtrate storage tank; the vacuum filtration platform is based on the structure of a vacuum drum filter mechanism. One end of the negative pressure buffer tank is connected to the upper interface of the filtrate storage tank; The other end of the negative pressure buffer tank is connected to a negative pressure source; The negative pressure source and negative pressure buffer tank are used to provide negative pressure to the vacuum filtration stand so that the vacuum filtration stand can filter the test slurry flowing out of the slurry nozzle to generate the initial filter cake.

[0020] In some embodiments of the fourth aspect, the drying measurement module includes: a drying oven and a filter cake weighing scale; The filter cake weighing scale is connected to the second control unit; The drying oven is used to dry the test filter cake; The filter cake weighing scale is used to measure the weight change data of the test filter cake before and after drying, and transmits the weight change data to the second control unit.

[0021] According to the filter cake moisture content monitoring device, method, system, and filtration testing device provided in the embodiments of this application, the filter cake moisture content monitoring device includes a first particle size measurement unit, a first thickness visual recognition unit, and a first control unit. The first particle size measurement unit measures the first slurry particle size, the first thickness visual recognition unit identifies the filter cake thickness of the target filter cake, and the first control unit determines the filter cake moisture content corresponding to the target filter cake based on the first slurry particle size, filter cake thickness, preset filtration-related data, and a preset moisture content determination algorithm. This achieves real-time monitoring of the filter cake moisture content without contacting the filter cake, thus avoiding damage to its integrity and preventing the transport of filter cakes with high moisture content. This reduces pipeline blockage and improves system stability. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of a filter cake moisture content monitoring device provided in an embodiment of this application; Figure 2 This illustration shows a schematic diagram of the filter assembly structure of the vacuum drum filter provided in an embodiment of this application; Figure 3 This illustration shows a flowchart of a filter cake moisture content monitoring method provided in an embodiment of this application. Figure 4 This is a schematic diagram of a filtration testing device provided in an embodiment of this application; Figure 5 This invention provides another schematic diagram of the structure of the filtration testing apparatus according to an embodiment of the present application. Figure 6 A schematic diagram of the structure of the vacuum filtration platform provided in the embodiment of this application is shown.

[0023] Symbol explanation: 10. First particle size measurement unit; 20. First thickness visual recognition unit; 30. First control unit; 40. Vacuum drum filter; 41. Filter assembly base; 43. First filter medium; 45. Filter assembly suction tube; 50. Slurry storage container; 210. Slurry generation measurement unit; 211. Precipitation reaction raw material storage tank; 212. Peristaltic pump; 213. Precipitation reaction container; 214. Stirrer; 215. Slurry storage tank; 216. Slurry weighing scale; 217. Valve; 218. Slurry nozzle; 230. Suction filtration measurement unit; 231. Vacuum suction filtration stand; 2311. Suction filtration funnel base; 2313. Second filter medium; 232. Negative pressure buffer tank; 233. Negative pressure source; 234. Filtrate storage tank; 235. Filtrate weighing scale; 250. Second particle size measurement unit; 270. Second thickness visual recognition unit; 290. Second control unit. Detailed Implementation

[0024] To enable those skilled in the art to better understand the technical solutions of this application, the application will be further described in detail below with reference to the accompanying drawings and embodiments.

[0025] The features and exemplary embodiments of various aspects of this application will now be described in detail. To make the objectives, technical solutions, and advantages of this application clearer, the application will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only configured to explain this application and are not configured to limit this application. For those skilled in the art, this application can be implemented without some of these specific details. The following description of the embodiments is merely to provide a better understanding of this application by illustrating examples of this application.

[0026] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0027] In related technologies, filter cakes with high moisture content can cause pipeline blockage and reduce system stability during transportation, which requires further optimization.

[0028] Example 1

[0029] The filter cake moisture content monitoring device provided in this application embodiment can be applied to the filter cake moisture content monitoring process in various technical fields.

[0030] like Figure 1 As shown, the filter cake moisture content monitoring device provided in this application embodiment includes: a first particle size measurement unit 10, a first thickness visual recognition unit 20, and a first control unit 30.

[0031] The first particle size measuring unit 10 is placed in the slurry storage container 50 upstream of the vacuum drum filter 40.

[0032] The first control unit 30 is connected to the first particle size measurement unit 10 and the first thickness visual recognition unit 20, respectively.

[0033] The first thickness visual recognition unit 20 is used to identify the thickness of the target filter cake and transmit the filter cake thickness to the first control unit 30. The target filter cake is located at the end of the filter cake dewatering zone of the vacuum drum filter 40.

[0034] The first particle size measuring unit 10 is used to measure the first particle size of the slurry in the slurry storage container 50 and transmit the first particle size to the first control unit 30.

[0035] The first control unit 30 is used to determine the filter cake moisture content corresponding to the target filter cake based on the first slurry particle size, filter cake thickness, preset filtration-related data, and a preset moisture content determination algorithm. The preset filtration-related data is related to the vacuum drum filter 40.

[0036] For example, the first particle size measurement unit 10 may be an online particle size analyzer, a laser diffraction particle size analyzer, a dynamic light scattering instrument, etc.

[0037] For example, the slurry storage container 50 is located upstream of the vacuum drum filter 40 and is used to store the precipitated slurry. The slurry storage container 50 can be a precipitated slurry reactor or a storage tank. The first particle size measuring unit 10 can be suspended inside the slurry storage container 50 or placed outside the slurry storage container 50, depending on the actual device used in the first particle size measuring unit 10.

[0038] For example, the vacuum drum filter 40 is a continuous solid-liquid separation device widely used in industries such as chemical, mining, and environmental protection. Its core principle is to achieve efficient separation of solid particles and liquid in a slurry by driving filtration through vacuum negative pressure.

[0039] The vacuum drum filter 40 can operate in different zones. In the filtration zone, the drum is immersed in the slurry tank, and vacuum suction forces the filtrate through the filter media, forming an initial filter cake on the surface of solid particles. In the dewatering zone, after the drum leaves the slurry, continuous vacuum suction further reduces the moisture content of the filter cake. The filter cake dewatering zone is the station before unloading in the vacuum drum filter 40. In the unloading zone, scrapers or backflushing air peel off the filter cake, completing the solid-liquid separation cycle. In the filter media regeneration zone, high-pressure water or compressed air cleans the filter media, such as the filter cloth.

[0040] like Figure 2 As shown, the filter assembly in the vacuum drum filter 40 includes a filter assembly base 41, a first filter medium 43, and a filter assembly suction tube 45. The filter assembly suction tube 45 is a tool for rapid and efficient solid-liquid separation.

[0041] The target filter cake is located at the end of the filter cake dewatering zone of the vacuum drum filter 40, indicating that the target filter cake has completed dewatering and will enter the unloading zone for the next step of filter cake stripping, completing the solid-liquid separation cycle. Therefore, the moisture content of the target filter cake is closely related to the subsequent filter cake conveying process.

[0042] For example, the first control unit 30 can be a microprocessor, a computer (e.g., a laptop computer), a server, etc.

[0043] For example, the first thickness visual recognition unit 20 can be a visual recognition camera, a visual sensor, a smart camera, etc.

[0044] For example, the preset filtration-related data is related to the vacuum drum filter 40, such as the filter components of the vacuum drum filter 40, including parameters such as the surface area of ​​the filter medium and the solid content of the slurry. The preset moisture content determination algorithm is based on the functional relationship between the slurry particle size (also known as the filter cake particle size), the filter cake density, and the moisture content. The filter cake density can be calculated based on the preset filtration-related data and the filter cake thickness.

[0045] In some embodiments, the first particle size measuring unit 10 is an online particle size measuring instrument.

[0046] The first thickness visual recognition unit 20 is a visual recognition camera.

[0047] A visual recognition camera is used to photograph the target filter cake in order to identify the thickness of the target filter cake.

[0048] By using an online particle size analyzer and a visual recognition camera, the filter cake moisture content monitoring device can be made more portable while meeting measurement requirements, and can be adapted to more scenarios in actual monitoring.

[0049] In some embodiments, the preset filtration-related data includes: a first preset filter media surface area and a first slurry solid content. The first preset filter media surface area corresponds to the filter element in the vacuum drum filter 40. The first slurry solid content is the slurry solid content of the filter element in the vacuum drum filter 40.

[0050] When the first control unit 30 determines the filter cake moisture content corresponding to the target filter cake based on the first slurry particle size, filter cake thickness, preset filtration-related data, and a preset moisture content determination algorithm, it is specifically used for: The filter cake volume is generated by multiplying the filter cake thickness by the surface area of ​​the first preset filter medium.

[0051] Calculate the quotient between the solid content of the first slurry and the volume of the filter cake to generate the corresponding filter cake density.

[0052] Input the filter cake density and the first slurry particle size into the preset moisture content determination algorithm to generate the corresponding filter cake moisture content.

[0053] For example, the first preset filter media surface area corresponds to the filter components in the vacuum drum filter 40, which generally includes multiple filter components, for example, 24 filter components. The filter media surface area of ​​each filter component is generally the same. The first slurry solids content of the filter component can be used to reflect the weight of the filter cake. This first slurry solids content is related to the rotational speed of the vacuum drum filter 40, the slurry outflow rate of the slurry storage container 50, and the second slurry solids content. The first slurry solids content can be calculated or pre-configured.

[0054] For example, the preset moisture content determination algorithm is based on the functional relationship between filter cake density, first slurry particle size, and filter cake moisture content.

[0055] In some embodiments, the first control unit 30 is further configured to: The first slurry solids content is calculated based on the slurry flow rate, the second slurry solids content, and the rotational speed of the vacuum drum filter. The slurry flow rate and the second slurry solids content are related to the slurry flowing into the vacuum drum filter 40 from the slurry storage container 50.

[0056] For example, the slurry flow rate and the rotation speed of the vacuum drum filter can be used to calculate the amount of slurry stored in the filter assembly, and then combined with the second slurry solid content, the first slurry solid content can be calculated.

[0057] The first slurry solid content can be calculated by taking the slurry flow rate, the second slurry solid content, and the speed of the vacuum drum filter. This allows us to determine the actual parameter data of the filter components, thus providing a basis for subsequent calculations to obtain the filter cake moisture content.

[0058] The filter cake moisture content monitoring device in this embodiment measures the first slurry particle size through the first particle size measurement unit 10 and identifies the filter cake thickness of the target filter cake through the first thickness visual recognition unit 20. Then, the first control unit 30 determines the filter cake moisture content corresponding to the target filter cake based on the first slurry particle size, filter cake thickness, preset filtration-related data, and preset moisture content determination algorithm, thereby realizing real-time monitoring of filter cake moisture content. This does not require contact with the filter cake and will not damage the integrity of the filter cake, thus avoiding the transportation of filter cakes with high moisture content, thereby reducing pipeline blockage and improving system stability.

[0059] The filter cake moisture content monitoring device in this embodiment adopts a non-contact online testing method, which avoids the impact of traditional contact testing on the normal operation of the filter machine. Online testing improves the testing speed of moisture content, which is conducive to early intervention in cases where the moisture content does not meet the standard, thereby improving the operational stability of the equipment.

[0060] Example 2

[0061] like Figure 3 As shown, the filter cake moisture content monitoring method provided in this application embodiment is based on the filter cake moisture content monitoring device of embodiment 1 and is applied to the first control unit 30 in the filter cake moisture content monitoring device. The method may include steps S101 to S103.

[0062] S101. Receive the first slurry particle size transmitted by the first particle size measurement unit. The first slurry particle size is measured by the first particle size measurement unit from the slurry generated in the slurry storage container. The slurry storage container is located upstream of the vacuum drum filter.

[0063] S102. Receive the filter cake thickness transmitted by the first thickness visual recognition unit. The filter cake thickness is generated by the first thickness visual recognition unit after thickness recognition of the target filter cake. The target filter cake is located at the end point of the filter cake dewatering zone of the vacuum drum filter.

[0064] S103. Determine the filter cake moisture content corresponding to the target filter cake based on the first slurry particle size, filter cake thickness, preset filtration-related data, and preset moisture content determination algorithm. The preset filtration-related data is related to the vacuum drum filter.

[0065] The filter cake moisture content monitoring method provided in this application avoids many problems caused by the failure to intervene in time when the moisture content of the continuous filter exceeds the standard. It solves the problems of filter cake damage and probe cleaning and decontamination that exist in traditional contact monitoring methods, and realizes the long-term healthy operation of the vacuum drum filter and its upstream and downstream equipment.

[0066] In some embodiments, the preset filtration-related data includes: a first preset filter media surface area and a first slurry solid content. The first preset filter media surface area corresponds to the filter element in the vacuum drum filter. The first slurry solid content is the slurry solid content of the filter element in the vacuum drum filter.

[0067] The process for determining the filter cake moisture content corresponding to the target filter cake based on the first slurry particle size, filter cake thickness, preset filtration-related data, and preset moisture content determination algorithm can be specifically described as follows: The filter cake volume is generated by multiplying the filter cake thickness by the surface area of ​​the first preset filter medium.

[0068] Calculate the quotient between the solid content of the first slurry and the volume of the filter cake to generate the corresponding filter cake density.

[0069] Input the filter cake density and the first slurry particle size into the preset moisture content determination algorithm to generate the corresponding filter cake moisture content.

[0070] In some implementations, a calculation process for the first slurry solid content is also included, as detailed below: The first slurry solids content is calculated based on the slurry flow rate, the second slurry solids content, and the rotational speed of the vacuum drum filter. The slurry flow rate and the second slurry solids content are related to the slurry flowing into the vacuum drum filter from the slurry storage container.

[0071] The filter cake moisture content monitoring method provided in this embodiment has the beneficial effects and implementation methods of the filter cake moisture content monitoring device provided in Embodiment 1 of this application. For details, please refer to the specific description of the filter cake moisture content monitoring device in Embodiment 1 above. This embodiment will not repeat the description here.

[0072] Example 3

[0073] The filter cake moisture content monitoring system provided in this application embodiment is based on the filter cake moisture content monitoring device provided in embodiment 1 of this application.

[0074] The filter cake moisture content monitoring system of this embodiment includes: a vacuum drum filter, a slurry storage container, and a filter cake moisture content monitoring device as described in Example 1.

[0075] The slurry storage container is connected to the vacuum drum filter.

[0076] The slurry storage container is used to store the slurry and transfer it to a vacuum drum filter for filtration to produce the target filter cake.

[0077] The filter cake moisture content monitoring device is used to measure the first slurry particle size in the slurry storage container and to identify the thickness of the target filter cake.

[0078] The filter cake moisture content monitoring device is also used to determine the filter cake moisture content corresponding to the target filter cake based on the first slurry particle size, filter cake thickness, preset filtration-related data, and a preset moisture content determination algorithm. The preset filtration-related data is related to the vacuum drum filter.

[0079] The filter cake moisture content monitoring system provided in this embodiment has the beneficial effects and implementation methods of the filter cake moisture content monitoring device provided in Embodiment 1 of this application. For details, please refer to the specific description of the filter cake moisture content monitoring device in Embodiment 1 above. This embodiment will not repeat the description here.

[0080] Example 4

[0081] like Figure 4 As shown in the figure, the dashed lines are used to describe the correlation of measurements. This application also provides a filtration testing device, including: a slurry generation measurement unit 210, a filtration measurement unit 230, a second particle size measurement unit 250, a second thickness visual recognition unit 270, and a second control unit 290.

[0082] The slurry generation measurement unit 210 is connected to the filtration measurement unit 230.

[0083] The second control unit 290 is connected to the slurry generation measurement unit 210, the filtration measurement unit 230, the second particle size measurement unit 250, and the second thickness visual recognition unit 270, respectively.

[0084] The slurry generation and measurement unit 210 is used to generate and measure the first weight of the raw slurry, transmit the first weight to the second control unit 290, and flow the test slurry into the filtration and measurement unit 230. The test slurry is part or all of the raw slurry.

[0085] The vacuum filtration measurement unit 230 is used to perform vacuum filtration on the test slurry, generating an initial filter cake and a filtrate after filtration. It measures the weight change of the filter cake before and after drying, as well as the second weight of the filtrate, and transmits the weight change data and the second weight to the second control unit 290. The test filter cake may be part or all of the initial filter cake.

[0086] The second particle size measuring unit 250 is used to measure the second particle size of the original slurry.

[0087] The second thickness visual recognition unit 270 is used to identify the thickness of the initial filter cake and transmit the thickness to the second control unit 290.

[0088] The second control unit 290 is used to construct a preset moisture content determination algorithm based on the first weight, the second weight, weight change data, thickness, the surface area of ​​the second preset filter medium, and the second slurry particle size.

[0089] For example, the vacuum filtration testing device is used to simulate the vacuum filtration process of an actual vacuum drum filter, and a preset moisture content determination algorithm is constructed during the specific vacuum filtration simulation test. The vacuum filtration measurement unit 230 maintains the same filling method, vacuum filtration method, and other aspects as the actual vacuum drum filter.

[0090] In some embodiments, the second particle size measurement unit 250 and the first particle size measurement unit 10 of Embodiment 1 are the same device, or the same device can be used. The second thickness visual recognition unit 270 and the first thickness visual recognition unit 20 of Embodiment 1 are the same device, or the same device can be used. The second control unit 290 and the first control unit 30 of Embodiment 1 are the same device, or the same device can be used.

[0091] For example, the second particle size measurement unit 250 and the first particle size measurement unit 10 can both be online particle size measuring instruments, the second thickness visual recognition unit 270 and the first thickness visual recognition unit 20 can both be visual recognition cameras, and the second control unit 290 and the first control unit 30 of Embodiment 1 can both be laptop computers.

[0092] For example, the slurry generation and measurement unit 210 can generate a raw slurry based on the precipitation reaction raw materials, and at the same time measure the generated raw slurry to obtain the first weight of the raw slurry.

[0093] For example, the test slurry is part or all of the original slurry. In practical applications, a portion of the original slurry is generally used as the test slurry to flow into the filtration measurement unit 230 for filtration.

[0094] For example, the filtration measurement unit 230 can perform filtration on the test slurry, and simultaneously measure the weight change data of the resulting test filter cake before and after drying, as well as the second weight of the filtrate. The test filter cake can be part or all of the initial filter cake. In practical applications, drying only a portion of the initial filter cake is generally sufficient, and the determined weight change data can be used for subsequent calculations with essentially the same effect. Using the weight change data of a portion of the initial filter cake can improve drying efficiency and save resources.

[0095] For example, when constructing the preset moisture content determination algorithm in the vacuum filtration testing device, it is based on the functional relationship between slurry particle size, filter cake density, and moisture content. Therefore, it is necessary to determine the slurry particle size, filter cake density, and moisture content based on the first weight, second weight, weight change data, thickness, second preset filter medium surface area, and second slurry particle size. At the same time, through multiple tests, multiple sets of slurry particle size, filter cake density, and moisture content are obtained to calculate the functional relationship between slurry particle size, filter cake density, and moisture content, and then construct the preset moisture content determination algorithm.

[0096] The vacuum filtration testing device in this embodiment, based on the characteristic that the density of the same filter cake is only affected by particle size, moisture content, and filling method, first obtains the functional relationship between filter cake density and particle size and moisture content through vacuum filtration experiments, thus providing a basis for online monitoring of filter cake moisture content in Example 1. This allows the use of a non-contact online testing method in Example 1, avoiding the impact of traditional contact testing on the normal operation of the filter. At the same time, it improves the speed of moisture content testing, which is beneficial for early intervention in cases where the moisture content is not up to standard, thereby improving the operational stability of the equipment.

[0097] like Figure 5 As shown in the figure, the rotational speed is exemplified by, for example, 300 rad / s (radians per second), and the weight is 2689.58 g (grams) or 515.58 g.

[0098] In some embodiments, the slurry generation measurement unit 210 includes a slurry generation module and a slurry storage measurement module.

[0099] The inlet terminals of the slurry generation module and the slurry storage and measurement module are connected.

[0100] The outlet end of the slurry storage measurement module is connected to the filtration measurement unit 230.

[0101] The slurry generation module is used to generate raw slurry and deliver it to the slurry storage and measurement module.

[0102] The slurry storage and measurement module is used to store the raw slurry delivered by the slurry generation module and to deliver the test slurry to the filtration and measurement unit 230. It is also used to measure the first weight of the stored raw slurry and transmit the first weight to the second control unit 290.

[0103] For example, the slurry generation module can generate raw slurry based on precipitation reaction raw materials, and the second particle size measurement unit 250 can be placed in the slurry generation module or outside the slurry generation module to measure the raw slurry in the slurry generation module.

[0104] For example, the slurry storage measurement module includes a storage device and a measuring device.

[0105] In some embodiments, the slurry generation module includes: a sedimentation reaction raw material storage tank 211, a peristaltic pump 212, a hose, a sedimentation reaction container 213, and a stirrer 214.

[0106] The outlet of the precipitation reaction raw material storage tank 211 is connected in sequence to the peristaltic pump 212 and the inlet of the precipitation reaction vessel 213 via a hose. The overflow outlet of the precipitation reaction vessel 213 is connected to the inlet of the slurry storage and measurement module.

[0107] The raw material storage tank 211 for precipitation reaction transports the slurry raw material to the precipitation reaction vessel 213 via a peristaltic pump 212.

[0108] Agitator 214 is used to agitate the slurry raw material flowing into sedimentation reaction vessel 213 to generate the original slurry.

[0109] The sedimentation reaction vessel 213 delivers the raw slurry to the slurry storage and measurement module through the overflow outlet.

[0110] The second particle size measuring unit 250 is suspended in the sedimentation reaction vessel 213 to measure the second slurry particle size of the original slurry in the sedimentation reaction vessel 213.

[0111] For example, the peristaltic pump 212 can transport the raw materials from the precipitation reaction raw material storage tank 211 to the precipitation reaction vessel 213 through a hose to react and generate the original slurry.

[0112] For example, the precipitation reaction vessel 213 can be a precipitation reaction cup, with the cup mouth as the inlet and the overflow outlet at the cup mouth as the outlet. Using a precipitation reaction cup can improve the efficiency of the precipitation reaction, the product recovery rate, and operational safety.

[0113] For example, the stirrer 214 can be a magnetically stirred sedimentation reactor, and the sedimentation reaction vessel 213 can be placed on top of the magnetically stirred sedimentation reactor. The magnetically stirred sedimentation reactor allows the raw materials in the sedimentation reaction vessel 213 to be stirred in a non-contact manner to generate the original slurry, making the stirring method more convenient.

[0114] The second slurry particle size corresponds to the original slurry, which is similar to the slurry stored in the slurry storage container in Example 1.

[0115] In some embodiments, the slurry storage and measurement module includes: a slurry storage tank 215, a slurry weighing scale 216, a valve 217, and a slurry nozzle 218.

[0116] The upper interface of the slurry storage tank 215 is connected to the overflow outlet of the sedimentation reaction vessel 213.

[0117] The lower end interface of the slurry storage tank 215 is connected to the slurry nozzle 218 via valve 217.

[0118] The slurry storage tank 215 is placed on the slurry weighing scale 216.

[0119] The slurry storage tank 215 is used to store the raw slurry transported by the precipitation reaction vessel 213.

[0120] Valve 217 is used to control the on / off state of the flow path between slurry storage tank 215 and slurry nozzle 218.

[0121] The slurry nozzle 218 is used to deliver the test slurry to the filtration measurement unit 230.

[0122] The slurry weighing scale 216 is used to measure the first weight of the raw slurry stored in the slurry storage tank 215 and transmit the first weight to the second control unit 290.

[0123] For example, valve 217 can be a ball valve, which has advantages such as fast opening and closing, tight sealing, low flow resistance and long service life, thereby improving the opening and closing efficiency and sealing performance of the filtration test device.

[0124] For example, the slurry nozzle 218 can improve the fluid control effect of the filtration test device and reduce resource consumption through more precise fluid control.

[0125] In some embodiments, the filtration measurement unit includes a vacuum filtration module, a filtrate storage tank, a filtrate weighing scale 235, and a drying measurement module.

[0126] The slurry inlet end of the vacuum filtration module corresponds to the slurry nozzle 218, and the filtrate outlet end of the vacuum filtration module is connected to the lower interface of the filtrate storage tank.

[0127] The upper interface of the filtrate storage tank is connected to the negative pressure supply end of the vacuum filtration module.

[0128] The filtrate storage tank is placed on the filtrate weighing scale 235.

[0129] The drying measurement module is connected to the second control unit 290.

[0130] The filtrate storage tank is used to store the filtrate generated after the vacuum filtration module filters the test slurry.

[0131] The filtrate weighing scale 235 is used to measure the second weight of the filtrate stored in the filtrate storage tank and transmit the second weight to the second control unit 290.

[0132] The second thickness visual recognition unit 270 is used to identify the thickness of the initial filter cake generated by the vacuum filtration module and transmit the thickness to the second control unit 290.

[0133] The drying measurement module is used to dry the test filter cake, measure the weight change data of the test filter cake before and after drying, and transmit the weight change data to the second control unit 290.

[0134] For example, the vacuum filtration module is similar to the vacuum drum filter in that it uses negative pressure vacuum filtration.

[0135] For example, the drying measurement module in Figure 5As not shown, the drying measurement module measures the weight change of the test filter cake before and after drying to determine the moisture content of the test filter cake.

[0136] In some embodiments, the vacuum filtration module includes: a vacuum filtration stand 231, a negative pressure buffer tank 232, and a negative pressure source 233.

[0137] The vacuum filtration stand 231 is placed directly below the slurry nozzle 218, and its lower interface is connected to the lower interface of the filtrate storage tank. The vacuum filtration stand 231 is based on the structure of a vacuum drum filter mechanism.

[0138] One end of the negative pressure buffer tank 232 is connected to the upper interface of the filtrate storage tank.

[0139] The other end of the negative pressure buffer tank 232 is connected to the negative pressure source 233.

[0140] The negative pressure source 233 and the negative pressure buffer tank 232 are used to provide negative pressure to the vacuum filtration stand 231 so that the vacuum filtration stand 231 filters the test slurry flowing out of the slurry nozzle 218 to generate an initial filter cake.

[0141] For example, such as Figure 6 As shown, the vacuum filtration platform 231 consists of a filtration funnel base 2311, a second filter medium 2313, and a steel structure platform. The second filter medium 2313 is the same as the first filter medium of the vacuum drum filter. The funnel outlet pipe diameter is the same as the filtration tube of the vacuum drum filter assembly, thus better mimicking the filtration effect of the vacuum drum filter.

[0142] In some implementations, the drying measurement module includes an oven and a filter cake weighing scale.

[0143] The filter cake weighing scale is connected to the second control unit 290.

[0144] The oven is used to dry the test filter cake.

[0145] The filter cake weighing scale is used to measure the weight change data of the test filter cake before and after drying, and transmits the weight change data to the second control unit 290.

[0146] For example, when drying test filter cakes in an oven, the operator may place the test filter cakes into the oven, or a conveyor may be used to transport the test filter cakes into the oven, such as a robotic arm.

[0147] To further describe the filtration testing apparatus provided in this embodiment, the testing process will be described in detail below. In this embodiment, the precipitation reaction vessel 213 is a precipitation reaction cup, the valve 217 is a ball valve, the stirrer 214 is a magnetically stirred precipitation reactor, the second particle size measurement unit 250 is an online particle size analyzer, the second thickness visual recognition unit 270 is a visual recognition camera, and the second control unit 290 is a laptop computer. The connection relationships of the filtration testing apparatus can be found in [reference needed]. Figure 5 .

[0148] Step 1: The outlet of the raw material storage tank 211 for precipitation reaction is guided to the precipitation reaction cup by a hose, and the hose passes through the peristaltic pump 212 to control the flow rate.

[0149] Step 2: Place the online particle size analyzer in the sedimentation reaction vessel to test the particle size of the slurry.

[0150] Step 3: Place the sedimentation reaction cup on the magnetically stirred sedimentation reactor and place the slurry storage tank 215 on the slurry weighing scale 216.

[0151] Step 4: Connect the overflow outlet of the sedimentation reaction cup to the upper interface of the slurry storage tank 215, connect the lower interface of the slurry storage tank 215 to the slurry nozzle 218, and connect a ball valve in series in the middle.

[0152] Step 5: Place the vacuum filtration stand 231 directly below the slurry nozzle 218, and connect the lower interface of the vacuum filtration stand 231 to the lower interface of the filtrate storage tank 234.

[0153] Step 6: Place the filtrate storage tank 234 on the filtrate weighing scale 235, and connect the upper interface of the filtrate storage tank to the negative pressure buffer tank 232. Connect the negative pressure buffer tank 232 to the negative pressure source 233.

[0154] Step 7: Point the visual recognition camera at the vacuum filtration table 231 to identify the filter cake thickness, and connect the data transmission cables of the online particle size analyzer, slurry weighing scale 216, visual recognition camera, and filtrate weighing scale 235 to the laptop computer to collect data.

[0155] Step 8: Prepare the raw materials required for the slurry precipitation reaction and place them in the precipitation reaction raw material storage tank 211 respectively.

[0156] Step 9: Close the ball valve, set the stirring speed of the magnetically stirred sedimentation reactor, and turn on the peristaltic pump 212 to stir the solution flowing into the reaction cup, thereby continuously generating precipitate. Record the slurry particle size μ measured by the online particle size analyzer. When the slurry level exceeds the overflow port of the sedimentation reaction cup, the slurry overflows into the slurry storage tank 215.

[0157] Step 10: Once the weight of the slurry storage tank 215 reaches the predetermined value, turn off the peristaltic pump 212 and open the outlet ball valve of the slurry storage tank 215, allowing the slurry to flow through the slurry nozzle 218 to the vacuum filtration table 231. The predetermined value can be set based on actual measurements.

[0158] Step 11: When the reading of the slurry weighing scale 216 does not change, close the ball valve and record the weight change of the slurry weighing scale 216. The above weight change is the weight A of the slurry entering the vacuum filtration table 231.

[0159] Step 12: Adjust the negative pressure source 233 to a lower negative pressure value, filter until the reading of the filtrate weighing scale 235 does not change, record the filtrate weight M1 and identify the filter cake thickness H1 through the visual recognition camera.

[0160] Step 13: Slightly increase the negative pressure value of negative pressure source 233 and continue filtration.

[0161] Step 14: Repeat step 13 multiple times, recording the filtrate weights M2, M3, M4… and filter cake thicknesses H2, H3, H4… each time, until the negative pressure value of negative pressure source 233 is increased and the reading of filtrate weighing scale 235 does not change. Record the final filtrate weight M. n and filter cake thickness H n .

[0162] Step 15: Slurry weight A and filtrate weight (M1, M2, M3…M) n The difference between A-M1, A-M2, A-M3…AM is used to calculate the weight of the filter cake for each step. n The thickness of the filter cake (H1, H2, H3…H) is identified by a visual recognition camera. n Multiplying the filter cake volume (V1, V2, V3…V) by the preset surface area S of the filter medium yields the filter cake volume. n The density of the filter cake, ρ1, ρ2, ρ3…ρ, is obtained by using the ratio of the filter cake weight to its volume. n .

[0163] Step 16: Obtain the final M n Take X weight from the filter cake sample and dry it in an oven until it reaches a constant weight Y. The weight loss XY is the weight of water in the filter cake. Divide the mass of water XY in the sampled filter cake by the weight X of the sampled filter cake to obtain the final moisture content ξ of the filter cake. n .

[0164] Step 17: Final moisture content of the filter cake ξ n Multiply by the weight of the filter cake m n The weight B of water in the slurry is obtained.

[0165] Step 18: Subtract the weight of the filtrate (M1, M2, M3...M) from the weight of the water in the slurry (B).n ), to obtain the weight of water in each filter cake B-M1, B-M2, B-M3…BM n .

[0166] Step 19: Weight of water in the filter cake (B-M1, B-M2, B-M3…BM) n Divide by the weight of the filter cake (m1, m2, m3...m n ), to obtain the moisture content of the filter cake ξ1, ξ2, ξ3…ξ for each time. n .

[0167] Step 20: Calculate the densities ρ1, ρ2, ρ3…ρ of the filter cake obtained above. n and filter cake moisture content ξ1, ξ2, ξ3…ξ n The function of moisture content versus density of filter cake at a certain particle size is fitted to form a relationship.

[0168] Step 21: Repeat steps 8 to 20. By adjusting the stirring speed of the magnetic stirring sedimentation reactor and the feed speed of the peristaltic pump 212 in step 9, slurries of different particle sizes are obtained. Then, the relationship between the moisture content and density of the material at different particle sizes is obtained. With particle size as a variable, the functional relationship ρ(μ, ξ) between density and particle size and moisture content is obtained.

[0169] After determining the functional relationship, it can be applied to the moisture content monitoring process in Example 1, as shown in steps 22 to 24.

[0170] Step 22: Place the online particle size analyzer in the slurry storage container (sedimentation slurry reactor or storage tank) upstream of the vacuum drum filter, and aim the visual recognition camera at the end point of the vacuum drum filter's desliming process. The data collected by the online particle size analyzer and the visual recognition camera are then transmitted to the laptop.

[0171] Step 23: When the vacuum drum filter is running normally, the slurry solids content entering each filter element is calculated using the slurry flow rate, slurry solids content, and vacuum drum filter rotation speed. The filter cake thickness H is obtained by visual recognition camera. a The particle size of the slurry was measured in μ by an online particle size analyzer. a Filter cake thickness H a Multiplying the surface area S of the filter medium gives the filter cake volume V. a The filter cake density ρ is obtained by dividing the solid content of each filter element by the filter cake volume. a .

[0172] Step 24: Based on the functional relationship between the density of this material and its particle size and moisture content ρ(μ, ξ), and density ρ... a and slurry particle size μ a The moisture content of the filter cake was calculated.

[0173] Before the first step, a vacuum filtration platform is made. The vacuum filtration platform consists of a filtration funnel base, a filter medium, and a steel structure platform. The filter medium is the same as that of the vacuum drum filter. The outlet pipe diameter of the funnel is the same as that of the vacuum drum filter assembly filtration tube. The filtration area is the same as that of the vacuum drum filter assembly filtration area.

[0174] The online particle size analyzer, filtrate weighing scale, and visual recognition camera are all equipped with radiation-resistant and acid / alkali-resistant skid-mounted systems to enable inspection, maintenance, and replacement under radioactive conditions. These three measuring devices characterize slurry particle size, filtrate weight, and filter cake thickness, respectively, with measurement accuracies of ±8 μm, ±0.1 g, and ±1 mm. They enable monitoring of filter cake moisture content in a vacuum drum filter without contact with the filter cake.

[0175] All data calculations are performed using laptops to improve computing speed and enable real-time online monitoring of moisture content.

[0176] The testing and monitoring methods in this embodiment utilize the characteristic that the density of the same type of filter cake is only affected by particle size, moisture content, and filling method. The vacuum filtration platform ensures consistency with the filter cake filling method of the vacuum drum filter. First, a functional relationship ρ(μ, ξ) between filter cake density and particle size and moisture content is obtained through vacuum filtration experiments. During normal operation of the vacuum drum filter, the filter cake particle size (i.e., the aforementioned slurry particle size) and filter cake density are obtained online using an online particle size analyzer and visual recognition. These are then input into the fitted function to achieve online monitoring of the filter cake moisture content. By employing a non-contact online testing method, the impact of traditional contact testing on the normal operation of the filter is avoided. Simultaneously, online testing increases the speed of moisture content testing, facilitating early intervention for substandard moisture content and improving equipment operational stability.

[0177] It is understood that the above embodiments are merely exemplary implementations used to illustrate the principles of this application, and this application is not limited thereto. For those skilled in the art, various modifications and improvements can be made without departing from the spirit and substance of this application, and these modifications and improvements are also considered to be within the scope of protection of this application.

Claims

1. A filter cake moisture content monitoring device, characterized in that, include: The system comprises a first particle size measurement unit, a first thickness visual recognition unit, and a first control unit; The first particle size measuring unit is placed in the slurry storage container upstream of the vacuum drum filter; The first control unit is connected to the first particle size measurement unit and the first thickness visual recognition unit, respectively. The first thickness visual recognition unit is used to identify the thickness of the target filter cake and transmit the filter cake thickness to the first control unit; the target filter cake is located at the end of the filter cake dewatering zone of the vacuum drum filter; The first particle size measuring unit is used to measure the first particle size of the slurry in the slurry storage container and transmit the first particle size to the first control unit; The first control unit is used to determine the filter cake moisture content corresponding to the target filter cake based on the first slurry particle size, the filter cake thickness, preset filtration-related data, and a preset moisture content determination algorithm; the preset filtration-related data is related to the vacuum drum filter. The preset moisture content determination algorithm is a functional relationship between slurry particle size, filter cake density, and filter cake moisture content. The preset filtration-related data includes: the surface area of ​​a first preset filter medium and the solid content of a first slurry; the surface area of ​​the first preset filter medium corresponds to the filter component in the vacuum drum filter; the solid content of the first slurry is the solid content of the slurry in the filter component of the vacuum drum filter. When the first control unit determines the filter cake moisture content corresponding to the target filter cake based on the first slurry particle size, the filter cake thickness, preset filtration-related data, and a preset moisture content determination algorithm, it is specifically used for: Calculate the product of the filter cake thickness and the surface area of ​​the first preset filter medium to generate the filter cake volume; Calculate the quotient between the solid content of the first slurry and the volume of the filter cake to generate the corresponding filter cake density; The filter cake density and the first slurry particle size are input into a preset moisture content determination algorithm to generate the corresponding filter cake moisture content.

2. The apparatus according to claim 1, characterized in that, The first particle size measurement unit is an online particle size analyzer; The first thickness visual recognition unit is a visual recognition camera; The visual recognition camera is used to photograph the target filter cake in order to identify the thickness of the target filter cake.

3. The apparatus according to claim 1, characterized in that, The first control unit is also used for: The first slurry solid content is calculated based on the slurry flow rate, the second slurry solid content, and the rotational speed of the vacuum drum filter; the slurry flow rate and the second slurry solid content are related to the slurry flowing into the vacuum drum filter from the slurry storage container.

4. A method for monitoring the moisture content of filter cake, characterized in that, Based on the filter cake moisture content monitoring device according to any one of claims 1 to 3, the method is applied to a first control unit in the filter cake moisture content monitoring device, the method comprising: The system receives a first slurry particle size transmitted by a first particle size measurement unit; the first slurry particle size is generated by the first particle size measurement unit from the slurry in the slurry storage container; the slurry storage container is located upstream of the vacuum drum filter. The filter cake thickness is received from the first thickness visual recognition unit; the filter cake thickness is generated by the first thickness visual recognition unit after recognizing the thickness of the target filter cake; the target filter cake is located at the end point of the filter cake dewatering zone of the vacuum drum filter. The filter cake moisture content corresponding to the target filter cake is determined based on the first slurry particle size, the filter cake thickness, preset filtration-related data, and a preset moisture content determination algorithm; the preset filtration-related data is related to the vacuum drum filter; the preset moisture content determination algorithm is a functional relationship between slurry particle size, filter cake density, and filter cake moisture content. The preset filtration-related data includes: the surface area of ​​a first preset filter medium and the solid content of a first slurry; the surface area of ​​the first preset filter medium corresponds to the filter component in the vacuum drum filter; the solid content of the first slurry is the solid content of the slurry in the filter component of the vacuum drum filter. The step of determining the filter cake moisture content corresponding to the target filter cake based on the first slurry particle size, the filter cake thickness, preset filtration-related data, and a preset moisture content determination algorithm includes: Calculate the product of the filter cake thickness and the surface area of ​​the first preset filter medium to generate the filter cake volume; Calculate the quotient between the solid content of the first slurry and the volume of the filter cake to generate the corresponding filter cake density; The filter cake density and the first slurry particle size are input into a preset moisture content determination algorithm to generate the corresponding filter cake moisture content.

5. A filter cake moisture content monitoring system, characterized in that, include: Vacuum drum filter, slurry storage container, and filter cake moisture content monitoring device as described in any one of claims 1 to 3; The slurry storage container is connected to the vacuum drum filter. The slurry storage container is used to store the slurry and transfer the slurry to the vacuum drum filter for filtration to generate the target filter cake. The filter cake moisture content monitoring device is used to measure the first slurry particle size in the slurry storage container and to identify the filter cake thickness of the target filter cake; The filter cake moisture content monitoring device is also used to determine the filter cake moisture content corresponding to the target filter cake based on the first slurry particle size, the filter cake thickness, preset filtration-related data, and a preset moisture content determination algorithm; the preset filtration-related data is related to the vacuum drum filter. The preset moisture content determination algorithm is a functional relationship between slurry particle size, filter cake density, and filter cake moisture content. The preset filtration-related data includes: the surface area of ​​a first preset filter medium and the solid content of a first slurry; the surface area of ​​the first preset filter medium corresponds to the filter component in the vacuum drum filter; the solid content of the first slurry is the solid content of the slurry in the filter component of the vacuum drum filter. When the filter cake moisture content monitoring device determines the filter cake moisture content corresponding to the target filter cake based on the first slurry particle size, the filter cake thickness, preset filtration-related data, and a preset moisture content determination algorithm, it is specifically used for: Calculate the product of the filter cake thickness and the surface area of ​​the first preset filter medium to generate the filter cake volume; Calculate the quotient between the solid content of the first slurry and the volume of the filter cake to generate the corresponding filter cake density; The filter cake density and the first slurry particle size are input into a preset moisture content determination algorithm to generate the corresponding filter cake moisture content.

6. A vacuum filtration testing device, characterized in that, include: The system includes a slurry generation measurement unit, a filtration measurement unit, a second particle size measurement unit, a second thickness visual recognition unit, and a second control unit. The slurry generation measurement unit is connected to the filtration measurement unit; The second control unit is connected to the slurry generation measurement unit, the filtration measurement unit, the second particle size measurement unit, and the second thickness visual recognition unit, respectively. The slurry generation and measurement unit is used to generate and measure the first weight of the original slurry, transmit the first weight to the second control unit, and flow the test slurry into the filtration and measurement unit; the test slurry is part or all of the original slurry. The vacuum filtration measurement unit is used to perform vacuum filtration on the test slurry to generate an initial filter cake and a filtrate after filtration, and to measure the weight change data of the test filter cake before and after drying, as well as to measure the second weight of the filtrate, and to transmit the weight change data and the second weight to the second control unit; the test filter cake is part or all of the initial filter cake; The second particle size measuring unit is used to measure the second particle size of the original slurry; The second thickness visual recognition unit is used to identify the thickness of the initial filter cake and transmit the thickness to the second control unit; The second control unit is used to construct a preset moisture content determination algorithm based on the first weight, the second weight, the weight change data, the thickness, the surface area of ​​the second preset filter medium, and the second slurry particle size.

7. The apparatus according to claim 6, characterized in that, The slurry generation measurement unit includes: a slurry generation module and a slurry storage measurement module; The slurry generation module and the slurry storage and measurement module are connected at their inlet ends; The outlet end of the slurry storage measurement module is connected to the filtration measurement unit; The slurry generation module is used to generate the raw slurry and transport the raw slurry to the slurry storage and measurement module; The slurry storage and measurement module is used to store the raw slurry delivered by the slurry generation module, and to deliver the test slurry to the filtration and measurement unit. It is also used to measure the first weight of the stored raw slurry and transmit the first weight to the second control unit.

8. The apparatus according to claim 7, characterized in that, The slurry generation module includes: a sedimentation reaction raw material storage tank, a peristaltic pump, a hose, a sedimentation reaction container, and a stirrer; The outlet of the precipitation reaction raw material storage tank is connected in sequence to the peristaltic pump and the inlet of the precipitation reaction container via a hose; the overflow outlet of the precipitation reaction container is connected to the inlet of the slurry storage and measurement module. The precipitation reaction raw material storage tank delivers the slurry raw material to the precipitation reaction vessel via the peristaltic pump; The stirrer is used to stir the slurry raw material flowing into the precipitation reaction vessel to generate the original slurry; The precipitation reaction vessel delivers the raw slurry to the slurry storage and measurement module through the overflow outlet; The second particle size measuring unit is suspended in the sedimentation reaction vessel to measure the second slurry particle size of the original slurry in the sedimentation reaction vessel.

9. The apparatus according to claim 8, characterized in that, The slurry storage and measurement module includes: a slurry storage tank, a slurry weighing scale, valves, and slurry nozzles; The upper interface of the slurry storage tank is connected to the overflow outlet of the precipitation reaction vessel; The lower end interface of the slurry storage tank is connected to the slurry nozzle through the valve; The slurry storage tank is placed on the slurry weighing scale; The slurry storage tank is used to store the raw slurry transported by the precipitation reaction vessel; The valve is used to control the on / off state of the flow path between the slurry storage tank and the slurry nozzle; The slurry nozzle is used to deliver the test slurry to the filtration measurement unit; The slurry weighing scale is used to measure the first weight of the raw slurry stored in the slurry storage tank and transmit the first weight to the second control unit.

10. The apparatus according to claim 9, characterized in that, The filtration measurement unit includes a vacuum filtration module, a filtrate storage tank, a filtrate weighing scale, and a drying measurement module. The slurry inlet end of the vacuum filtration module corresponds to the slurry nozzle, and the filtrate outlet end of the vacuum filtration module is connected to the lower interface of the filtrate storage tank. The upper interface of the filtrate storage tank is connected to the negative pressure supply end of the vacuum filtration module; The filtrate storage tank is placed on the filtrate weighing scale; The drying measurement module is connected to the second control unit; The filtrate storage tank is used to store the filtrate generated after the vacuum filtration module filters the test slurry. The filtrate weighing scale is used to measure the second weight of the filtrate stored in the filtrate storage tank and transmit the second weight to the second control unit; The second thickness visual recognition unit is used to identify the thickness of the initial filter cake generated by the vacuum filtration module and transmit the thickness to the second control unit; The drying measurement module is used to dry the test filter cake, measure the weight change data of the test filter cake before and after drying, and transmit the weight change data to the second control unit.

11. The apparatus according to claim 10, characterized in that, The vacuum filtration module includes: a vacuum filtration stand, a negative pressure buffer tank, and a negative pressure source; The vacuum filtration frame is placed directly below the slurry nozzle, and the lower interface of the vacuum filtration frame is connected to the lower interface of the filtrate storage tank; the vacuum filtration frame is based on the structure of a vacuum drum filter mechanism. One end of the negative pressure buffer tank is connected to the upper interface of the filtrate storage tank; The other end of the negative pressure buffer tank is connected to the negative pressure source; The negative pressure source and the negative pressure buffer tank are used to provide negative pressure to the vacuum filtration stand so that the vacuum filtration stand can filter the test slurry flowing out of the slurry nozzle to generate the initial filter cake.

12. The apparatus according to claim 10, characterized in that, The drying measurement module includes: a drying oven and a filter cake weighing scale; The filter cake weighing scale is connected to the second control unit; The oven is used to dry the test filter cake; The filter cake weighing scale is used to measure the weight change data of the test filter cake before and after drying, and transmits the weight change data to the second control unit.

Images