An activated carbon iodine adsorption value rapid intelligent detector and a detection method thereof

Abstract

The application discloses a kind of activated carbon iodine adsorption value fast intelligent detector and its detection method, it is related to activated carbon iodine adsorption value detection technical field, including sample type and detection parameter acquisition, activated carbon sample crushing, sample drying, weighing calibration, iodine standard solution and dilute hydrochloric acid automatic addition, stirring dissolution mixing, filtration liquid taking and automatic titration, and by AI image visual recognition automatic judgment indicator addition and titration end point, finally according to reagent concentration, reagent consumption, sample mass and correction coefficient automatically calculate the iodine adsorption value of activated carbon and generate detection record.The application is changed into continuous automatic detection process by multiple dispersed artificial steps, compared with traditional manual national standard detection method, the application reduces artificial waiting, artificial transfer, artificial color judgment and artificial calculation time, optimizes and simplifies detection method, can shorten the detection period of single sample, improve activated carbon production quality control, environmental protection acceptance and detection efficiency in on-site spot check.

Description

Technical Field

[0001] This invention relates to the field of activated carbon iodine adsorption detection technology, and in particular to a rapid intelligent detector for activated carbon iodine adsorption value and its detection method. Background Technology

[0002] The iodine adsorption value of activated carbon is an important indicator for evaluating its adsorption performance. Current national standard laboratory testing methods use titration, which requires sample crushing, drying, weighing, adding iodine solution, stirring, filtration, sodium thiosulfate titration, endpoint determination, result calculation, and quality control. This testing process involves multiple experimental instruments and manual operations, with numerous steps and a long overall testing cycle, making it difficult to meet the efficiency requirements for rapid on-site testing in production sites, environmental inspections, and environmental acceptance processes.

[0003] Meanwhile, traditional testing processes typically require manual transfer of iodine standard solution, sodium thiosulfate standard solution, hydrochloric acid, and starch indicator, as well as manual stirring, mixing, filtration, liquid collection, and titration. Since weighing, transfer, mixing, titration, and endpoint determination all rely on human experience, the operation demands a high level of expertise from the operators. Accuracy in weighing, precision in liquid collection, thorough mixing, and the determination of the titration color endpoint all require manual judgment, making the process not only cumbersome but also unsuitable for portable on-site testing.

[0004] In addition, traditional methods consume a large amount of reagents, requiring several hundred milliliters of reagent per sample, resulting in high testing costs per sample. This increases the company's investment in environmental management and adds to its economic burden.

[0005] To improve the detection efficiency of activated carbon iodine adsorption value, shorten the detection cycle, reduce the trouble of manual operation, lower the detection cost, and adapt to the rapid on-site detection environment, we propose a rapid intelligent detector for activated carbon iodine adsorption value and its detection method. Summary of the Invention

[0006] The purpose of this invention is to provide a rapid intelligent detector for the iodine adsorption value of activated carbon and its detection method, so as to solve the problems mentioned in the background art.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a rapid and intelligent detection method for iodine adsorption value of activated carbon, comprising:

[0008] Step 1: Obtain the sample type and detection parameters of the activated carbon sample to be tested. The detection parameters include the concentration of iodine standard solution and the concentration of sodium thiosulfate standard solution.

[0009] Step 2: Crush the activated carbon sample to be tested, weigh and tare the empty heating container, put the crushed activated carbon powder into the heating container with a pre-weighing of 0.3g, and automatically perform drying treatment according to the preset detection program;

[0010] Step 3: The heating container containing activated carbon powder is automatically transferred to the weighing position by a moving mechanism to obtain the actual mass of activated carbon powder. The active unit automatically determines whether the actual mass is within the allowable range of sample mass. If it is not within the allowable range, a prompt to replenish or reduce the sample is automatically output, and the actual mass is obtained again. If it is within the allowable range, the actual mass is automatically recorded as the iodine adsorption value for calculating the mass.

[0011] Step 4: Iodine standard solution and dilute hydrochloric acid are automatically added to the container containing activated carbon powder, and stirring is automatically started to ensure that the activated carbon powder and iodine standard solution are fully in contact to form a carbon-containing mixture.

[0012] Step 5: Automatically filter the carbon-containing mixture to obtain filtrate, and automatically quantitatively extract a preset volume of the filtrate to be titrated from the filtrate and transfer it to the titration container;

[0013] Step 6: Perform automatic titration of the filtrate to be titrated with sodium thiosulfate standard solution. At the same time, automatically and continuously collect the color image visual information of the solution in the titration container and automatically determine the titration stage based on the color image visual information. When the color image visual information reaches the first color change condition, starch indicator is automatically added. Continue titration and automatically stop titration when the color image visual information reaches the second color change condition, and record the amount of sodium thiosulfate standard solution consumed.

[0014] Step 7: Based on the concentration of the iodine standard solution, the concentration of the sodium thiosulfate standard solution, the amount of iodine standard solution added, the amount of sodium thiosulfate standard solution consumed, the actual mass of the activated carbon powder, and the correction coefficient corresponding to the sample type, the main control unit automatically calculates the iodine adsorption value of the activated carbon and automatically generates a detection record.

[0015] Preferably, in step 2, after the preset drying time is reached, the fan cooling module is automatically started to continuously collect the container temperature. When the container temperature drops to the preset transfer temperature, the main control unit automatically releases the transfer interlock and allows the moving mechanism to perform the transfer operation.

[0016] Preferably, step 3, obtaining and judging the actual mass of the activated carbon powder, includes:

[0017] After heating and cooling are complete, the moving mechanism transfers the heating container to the weighing platform, and the effective mass of the charcoal powder is weighed a second time.

[0018] Determine whether the effective mass falls within the allowable range of 0.2g to 0.26g; if it is below the allowable range, an automatic sample replenishment prompt is output; if it is above the allowable range, an automatic sample reduction prompt is output; if it is within the allowable range, the effective mass is automatically locked and modification is prohibited during subsequent testing.

[0019] Preferably, the iodine standard solution and dilute hydrochloric acid are added automatically in step 4;

[0020] The automatic dosing process of iodine standard solution includes: first, the peristaltic pump is automatically started to deliver 20 mL of iodine standard solution to a container placed on the weighing platform through the pipeline. The volume of the 20 mL solution is controlled by weighing based on the weight calculated by "volume × solution density". Before the iodine standard solution is added, the weighing platform automatically deducts the weight of the beaker and activated carbon and tare it. After the addition begins, when the mass of the weighing platform reaches the preset weight of "volume × solution density", the addition is completed and the process stops automatically.

[0021] Beforehand, manually draw 2 mL of 5% hydrochloric acid using a plastic syringe and place it in the slot of the moving mechanism; after the iodine standard solution has been added, the push rod will be automatically activated to push the syringe and complete the one-time rapid addition of dilute hydrochloric acid;

[0022] After the iodine standard solution and dilute hydrochloric acid have been added, the stirring program will start automatically.

[0023] Preferably, in step 5, the automatic filtration of the carbon-containing mixture includes:

[0024] The vacuum filtration pump is started to introduce the carbon-containing mixture into the filtration assembly, which is a two-stage combination filtration membrane with a pore size of "1μm + 0.45μm".

[0025] The main control unit automatically collects pump running time, filtration flow rate, and filtration pressure parameters during the filtration process;

[0026] The system automatically determines whether the filter membrane is clogged or has any missing parts based on the parameters.

[0027] If a blockage or leakage is detected, the filtrate sampling will be automatically stopped and a prompt to replace the filter membrane or reinstall the filter assembly will be displayed; if no abnormality is detected, 10 mL of filtrate will be quantitatively drawn from the filtrate container and transferred to the titration container.

[0028] Preferably, in step 6, the color image visual information includes at least two of the following: RGB color values, HSV color values, and luminance values. The first color change condition and the second color change condition are determined as follows:

[0029] Before titration begins, a high-definition camera automatically captures background images of the titration container and images of the initial solution to establish a color visual benchmark under the current detection environment.

[0030] During the titration process, the AI ​​color vision recognition module automatically and continuously acquires solution images and removes image areas corresponding to container edges, bubbles, stirring vortices, and external reflective areas.

[0031] The system automatically extracts RGB color values, HSV color values, and brightness values ​​from the retained solution area and forms the current color visual characteristics.

[0032] When the current color visual feature matches the light yellow feature range, and the number of consecutive matches reaches the first stable number, the first color change condition is automatically met and starch indicator is quickly and automatically added.

[0033] After adding starch indicator, color visual features are collected again. When the current color visual feature matches the colorless and transparent feature range, and the number of consecutive matches reaches the second stable number, the second color change condition is automatically met and the titration is stopped.

[0034] Preferably, in step 6, when determining the second color change condition, a titration over-control is set, specifically including:

[0035] Based on the rate of change of color visual characteristics during titration, the titration control program automatically divides the addition of sodium thiosulfate standard solution into a continuous addition stage, a decelerated addition stage, and a slow single-drop confirmation stage.

[0036] When the color visual characteristics are close to the light yellow characteristic range or the colorless and transparent characteristic range, reduce the dripping speed of the metering pump;

[0037] When the color visual features enter the near-end point range, the metering pump is automatically controlled to add the color visual image in a slow single-drop manner, and after each drop, a preset mixing time is waited before the color visual image is collected.

[0038] If the color visual characteristics do not stabilize into the colorless and transparent characteristic region after slow single-drop addition, continue slow single-drop addition; if they stabilize into the colorless and transparent characteristic region, stop adding drops and record the final volume.

[0039] Preferably, the activated carbon iodine adsorption value in step 7 is calculated as follows: E = (C1 × V1 - 2.2 × C2 × V2) × 126.9 / m / K;

[0040] Where E is the iodine adsorption value of activated carbon, C1 is the concentration of iodine standard solution, V1 is the volume of iodine standard solution added, C2 is the concentration of sodium thiosulfate standard solution, V2 is the volume of sodium thiosulfate standard solution consumed, m is the actual mass of activated carbon powder, and K is the correction coefficient; when the sample type is new carbon, K is 0.9; when the sample type is old carbon, K is 0.86.

[0041] Preferably, before performing activated carbon iodine adsorption value testing, the process also includes solution calibration and pipeline status verification steps:

[0042] After each batch of iodine standard solution and sodium thiosulfate standard solution is replaced, the reagent preparation date and calibration status should be read.

[0043] If the reagent has exceeded its preset expiration date or has not been calibrated, the sample testing process must be stopped, and a prompt will be made to perform solution calibration.

[0044] First, the sodium thiosulfate standard solution was automatically titrated and standardized using a reference solution. Then, the iodine standard solution was automatically titrated and standardized using the standardized sodium thiosulfate standard solution.

[0045] A rapid intelligent detector for activated carbon iodine adsorption value, used to implement any one of the rapid intelligent detection methods for activated carbon iodine adsorption value, comprising:

[0046] The machine body is provided with a detection chamber, which is equipped with a heating plate, a weighing platform, and a container station for placing filtrate containers, titration containers, and waste liquid containers.

[0047] The main control unit, located inside the machine, is used to perform detection process control, data acquisition, color recognition result judgment, titration endpoint judgment, and iodine adsorption value calculation.

[0048] The main control screen, connected to the main control unit, is used to input sample information, reagent concentration, sample type and detection parameters, and to display the detection status and detection results;

[0049] The pulverizing module is used to pulverize the activated carbon sample to be tested.

[0050] The heating and drying module has a container containing activated carbon placed on top of a ceramic flat heating plate. The main control unit has built-in automatic heating, temperature rise and timing programs for temperature-controlled drying of activated carbon powder.

[0051] A fan cooling module is located near the heating and drying module and is used to automatically start after drying to assist in cooling the container containing activated carbon.

[0052] The weighing module includes a gravity sensor for obtaining the actual mass of the activated carbon powder.

[0053] The moving mechanism is equipped with two moving mechanism modules in the horizontal and vertical directions and limit sensors, which are used to transfer containers or pick up and put in liquid addition components between the heating and drying module, weighing module, dissolving container station, filtrate container station and titration container station.

[0054] The liquid addition and titration module includes multiple independently controlled metering pumps or peristaltic pumps and a syringe plunger module, which are used to deliver iodine standard solution, sodium thiosulfate standard solution, filtrate, and add dilute hydrochloric acid and starch indicator, respectively.

[0055] A filtration module, located between the dissolving container and the filtrate container, is used to filter carbon-containing mixtures.

[0056] The stirring module includes a dissolving mechanical stirrer and a titration magnetic stirrer, which are used for dissolving and mixing activated carbon powder with iodine standard solution and for mixing the titrant during titration, respectively.

[0057] The cleaning module is used to automatically clean pipes and containers after sample testing is completed;

[0058] The AI ​​color vision recognition module includes a camera, a light shield, and an image processing unit. The camera is positioned facing the titration container to capture visual images of the solution color during titration. The image processing unit extracts RGB color values, HSV color values, and brightness values. The AI ​​machine recognition system then outputs the judgment results of the first and second color change conditions. The light shield is used to ensure the stability of the system's light source and light.

[0059] The data storage and printing module is connected to the main control unit and is used to store sample information, weighing data, reagent concentration, titration consumption, iodine adsorption value results and detection time, and print the test report according to the user's selection.

[0060] The technical effects and advantages of this invention are as follows:

[0061] (1) The present invention uses a main control unit to perform process control on sample type, detection parameters, drying and cooling, weighing and verification, automatic liquid addition, automatic dissolution, automatic filtration and liquid extraction, automatic titration, AI color vision recognition and result calculation. This transforms the detection of iodine adsorption value of activated carbon from multiple scattered manual steps into a continuous automatic detection process. Compared with the traditional manual detection method, the present invention reduces the time for manual waiting, manual transfer, manual color judgment and manual calculation, optimizes and simplifies the detection method, shortens the detection cycle of a single sample, and improves the detection efficiency in activated carbon production quality control, environmental protection acceptance and on-site sampling inspection.

[0062] (2) The detection method of the present invention optimizes and simplifies the national standard method, adopts an automatic control process, and achieves precise temperature control, precise metering, full dissolution, and precise automatic titration. This greatly eliminates human operation errors, improves the detection accuracy of small mass materials, effectively reduces the amount of activated carbon powder and reagent consumption required for detection, significantly reduces reagent consumption and detection costs, and also ensures that the accuracy and error rate of iodine adsorption value detection are ≤5%, which is within an acceptable range.

[0063] (3) The detector of the present invention integrates a crushing module, a heating and drying module, a fan cooling module, a weighing module, a moving mechanism, a liquid addition and titration module, a filtration module, a stirring module, a cleaning module, an AI color vision recognition module, a data storage and printing module into the machine body. The operator only needs to complete the sample placement, parameter confirmation and necessary consumable replacement, and the instrument can automatically complete the detection. This reduces the dependence on professional experimental personnel and fixed laboratory conditions, reduces the difficulty of manual operation, and facilitates portable and rapid detection in production sites, engineering acceptance sites, environmental monitoring sites and other scenarios. Attached Figure Description

[0064] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used together with the embodiments of the invention to explain the invention, but do not constitute a limitation thereof. In the drawings:

[0065] Figure 1 This is a flowchart of the automatic detection process of the present invention;

[0066] Figure 2 This is a flow chart of the quantitative liquid preparation process of the present invention;

[0067] Figure 3 This is an integrated flowchart of the detector of the present invention;

[0068] Figure 4 This is a flowchart of the process verification of the present invention;

[0069] Figure 5 This is a flowchart illustrating the on-site rapid detection and result traceability process of the present invention;

[0070] Figure 6 This is a schematic diagram of the detector structure of the present invention.

[0071] In the diagram: 101. Main control screen; 102. Data storage and printing module; 103. Weighing module; 104. Light shield; 105. Fan cooling module; 106. Container station; 107. Moving mechanism; 108. Liquid addition and titration module; 109. Camera; 201. Heating plate; 202. Dissolving container; 204. Filtrate container; 205. Titration container; 206. Waste liquid container. Detailed Implementation

[0072] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0073] This invention provides, for example Figures 1-6 The method for rapid and intelligent detection of iodine adsorption value on activated carbon, as shown, includes:

[0074] Step 1: Obtain the sample type and detection parameters of the activated carbon sample to be tested. The detection parameters include the concentration of iodine standard solution and the concentration of sodium thiosulfate standard solution.

[0075] In practice, before entering the testing process, the detector inputs the sample name, batch number, and sample type of the activated carbon sample to be tested via the main control screen 101 or the host computer. The main control unit calls the corresponding testing program based on the selected sample type and reads the required testing parameters, including the concentrations of the iodine standard solution and the sodium thiosulfate standard solution. The preferred preset addition volume of the iodine standard solution is 20 mL, the preferred filtrate sampling volume is 10 mL, and the preferred sample mass range is 0.2 g to 0.26 g.

[0076] After confirming that the above parameters are complete and within the allowable range, the main control unit generates the current testing task and binds and saves the sample type, reagent concentration, liquid volume, sampling volume, and weighing range to the testing task. If there are any issues such as uncalibrated reagent concentration, unselected sample type, or parameters exceeding the preset range, the main control unit will prevent the subsequent testing process from starting and output a prompt.

[0077] By setting up the above parameters, different types of activated carbon samples can be matched with corresponding correction coefficients, drying strategies and calculation parameters before entering the testing process, avoiding parameter mismatches caused by manual temporary selection or recording. At the same time, by binding reagent concentration, liquid volume and weighing range to the testing task in advance, it can ensure that subsequent automatic liquid addition, weighing judgment, titration calculation and result traceability have a unified data source, thereby improving the standardization, automation and reliability of the testing process.

[0078] Step 2: Crush the activated carbon sample to be tested, weigh and tare the empty heating container, place the crushed activated carbon powder into the heating container and pre-weigh 0.3g, and perform drying treatment.

[0079] Step 2, which determines whether to perform drying treatment based on the sample type, includes:

[0080] Read the sample type identifier obtained from user input or system recognition, and call the preprocessing rule corresponding to the sample type identifier;

[0081] The heating module is controlled to heat up to the drying temperature at a preset heating rate and maintain the preset drying time, while simultaneously collecting data on heating temperature changes.

[0082] After the preset drying time is reached, the fan cooling module 105 is automatically started and the container temperature is continuously collected. When the container temperature drops to the preset transfer temperature, the moving mechanism 107 is allowed to perform the transfer operation.

[0083] In practice, the activated carbon sample to be tested is first pulverized into a uniform powder by a pulverizing module, preferably ground to a size that can pass through a 200-mesh sieve to reduce the impact of particle size differences on the contact adsorption of iodine solution. The pulverized activated carbon powder is placed in a heating container. The main control unit reads the sample type identifier input by the user or recognized by the system and calls the corresponding preprocessing rules. The main control unit controls the heating module to heat to the drying temperature at a preset heating rate and maintains the preset drying time. At the same time, the heating temperature change data is collected in real time by a temperature sensor to ensure that the drying process is under control. After drying is completed, the fan cooling module 105 is activated to cool the heating container by air or other means. The main control unit only allows the moving mechanism 107 to grab or transfer the container when the container temperature is detected to be lower than the preset transfer temperature.

[0084] Step 3: Transfer the heating container containing activated carbon powder to the weighing position, obtain the actual mass of the activated carbon powder, and determine whether the actual mass is within the allowable range of sample mass. If it is not within the allowable range of sample mass, output a prompt to replenish or reduce the sample, and obtain the actual mass again. If it is within the allowable range of sample mass, record the actual mass as the mass for calculating the iodine adsorption value.

[0085] Step 3, which involves obtaining and determining the actual mass of the activated carbon powder, includes:

[0086] After heating and cooling are complete, the moving mechanism 107 transfers the heating container to the weighing platform and weighs the effective mass of the charcoal powder for the second time.

[0087] Determine if the effective mass falls within the allowable range of 0.2g to 0.26g; if it is below the allowable range, output a sample replenishment prompt; if it is above the allowable range, output a sample reduction prompt; if it is within the allowable range, lock the effective mass and prohibit modification during subsequent testing.

[0088] In practice, after drying or pretreatment, the heated container is transferred to the weighing position by the moving mechanism 107 and placed on the weighing module 103. The main control unit first controls the weighing sensor to perform a tare operation, recording the mass of the empty container or reaching a zero state to eliminate the influence of the container's own weight on the sample mass. Subsequently, the weighing data after adding activated carbon powder is collected, and the stability of multiple consecutive sampling results is judged; when the change between consecutive weighing data is less than the preset weighing fluctuation threshold, the weighing state is considered stable, and the current weighing data is taken as the valid mass.

[0089] The main control unit compares the effective mass with the preset allowable sample mass range, preferably determining whether it falls between 0.2g and 0.26g. If the effective mass is below the allowable range, a supplementary sample prompt is output via the display screen, buzzer, or indicator light; if the effective mass is above the allowable range, a sample reduction prompt is output, and weighing data is re-acquired after adjustment. If the effective mass is within the allowable range, this mass is locked as the calculated mass for this iodine adsorption value and is bound to the sample number and testing task for storage, and cannot be arbitrarily modified during subsequent testing.

[0090] The above settings can prevent inaccurate calculation results caused by unstable container weight, unstable weighing, manual recording errors, or sample quantity deviations. At the same time, the sample replenishment and reduction prompts make sample quantity control more intuitive, and the quality locking mechanism ensures that the weighing data corresponds one-to-one with the subsequent titration calculations, thereby improving the accuracy and traceability of the test results.

[0091] Step 4: Automatically add iodine standard solution and dilute hydrochloric acid to the container containing activated carbon powder, and start stirring to ensure that the activated carbon powder and iodine standard solution are fully in contact to form a carbon-containing mixture.

[0092] In step 4, the iodine standard solution and dilute hydrochloric acid are added automatically.

[0093] The automatic dosing process of iodine standard solution specifically includes:

[0094] First, the peristaltic pump is automatically started to deliver 20 mL of iodine standard solution to the container containing activated carbon powder placed on the weighing platform through the pipeline. The volume of the 20 mL solution is controlled by weighing based on the weight calculated by "volume × solution density". Before adding the iodine standard solution, the weighing platform automatically deducts the weight of the beaker and activated carbon and tare it. After the addition is started, when the mass of the weighing platform reaches the preset weight of "volume × solution density", the addition is completed and the system stops automatically.

[0095] 2 mL of 5% hydrochloric acid was manually drawn into the slot of the moving mechanism 107 beforehand using a plastic syringe; after the iodine standard solution was added, the push rod was automatically activated to push the syringe and complete the one-time rapid addition of dilute hydrochloric acid.

[0096] After the iodine standard solution and dilute hydrochloric acid have been added, the stirring program will start automatically.

[0097] In practice, after the activated carbon powder is weighed to be qualified, the main control unit controls the iodine standard solution delivery pump to add 20 ml of iodine standard solution into the dissolving container 202, and controls the liquid addition mechanism to add a preset amount of dilute hydrochloric acid.

[0098] Then, the stirring mechanism is activated to fully mix the activated carbon powder with the iodine standard solution and dilute hydrochloric acid to form a carbon-containing mixture.

[0099] Step 5: Automatically filter the carbon-containing mixture to obtain filtrate, and quantitatively extract a preset volume of the filtrate to be titrated into titration container 205.

[0100] Step 5, which involves automatic filtration of the carbon-containing mixture, includes:

[0101] The vacuum filtration pump is started to introduce the carbon-containing mixture into the filtration assembly, which is set as a two-stage combination filtration membrane with a pore size of "1μm + 0.45μm".

[0102] Collect parameters such as pump running time, filtration flow rate, and filtration pressure during the filtration process;

[0103] Determine whether the filter membrane is clogged or has any missing parts based on the parameters;

[0104] If a blockage or leakage is detected, filtrate sampling will be stopped and a prompt to replace the filter membrane or reinstall the filter assembly will be displayed; if no abnormality is detected, 10 mL of filtrate will be quantitatively drawn from filtrate container 204 and transferred to titration container 205.

[0105] In practice, after the activated carbon powder reacts with the iodine standard solution and dilute hydrochloric acid, the main control unit starts the filtration pump, introducing the carbon-containing mixture in the dissolution container 202 into the filtration assembly via the extraction pipeline. The filtration assembly is equipped with a two-stage combined filtration membrane with pore sizes of 1μm and 0.45μm to trap fine activated carbon powder and suspended impurities, ensuring that the liquid entering the filtrate container 204 meets the requirements for subsequent titration sampling. During the filtration process, the main control unit collects at least one filtration status parameter, including the filtration pump running time, filtration flow rate, or filtration pressure, and compares it with a preset filtration status range.

[0106] If the filtration time is significantly prolonged, the filtration flow rate is lower than the preset flow rate, or the filtration pressure rises abnormally, it is determined that the filter membrane may be clogged. If the filtration pressure is too low, the flow rate increases abnormally, or obvious carbon powder residue appears in the filtrate, it is determined that the filter membrane may be missing, damaged, or improperly installed. If any of the above abnormalities exist, the system stops filtrate sampling and prompts for replacement of the filter membrane or reinstallation of the filter assembly via the display screen or alarm module. If the filtration status is normal, the metering pump is controlled to quantitatively extract 10 mL of filtrate from the filtrate container 204 and transfer it to the titration container 205.

[0107] With the above settings, the quality of the filtrate can be monitored before titration, preventing carbon powder residue from entering the titration process and affecting color recognition and endpoint judgment. At the same time, it can promptly detect abnormalities such as filter membrane blockage or missing parts, reducing detection errors caused by insufficient filtration, inaccurate sampling volume, or turbid filtrate, and improving the stability and reliability of the detection process.

[0108] Step 6: Perform automatic titration of the filtrate to be titrated with sodium thiosulfate standard solution. At the same time, collect the color image visual information of the solution in the titration container 205 and determine the titration stage based on the color image visual information. When the color image visual information reaches the first color change condition, starch indicator is automatically added. Continue titration and stop titration when the color image visual information reaches the second color change condition. Automatically record the amount of sodium thiosulfate standard solution consumed.

[0109] In step 6, the color image visual information includes at least two of the following: RGB color values, HSV color values, and luminance values. The first color change condition and the second color change condition are determined as follows:

[0110] Before titration begins, acquire background images of titration container 205 and initial solution images to establish a color visual benchmark under the current detection environment;

[0111] During the titration process, solution images were continuously acquired, and image areas corresponding to container edges, air bubbles, stirring vortices, and external reflective areas were removed.

[0112] The system automatically extracts RGB color values, HSV color values, and brightness values ​​from the retained solution area and forms the current color visual characteristics.

[0113] When the current color visual feature matches the light yellow feature range, and the number of consecutive matches reaches the first stable number, it is determined that the first color change condition is met and starch indicator is quickly and automatically added.

[0114] After adding starch indicator, color visual features are collected again. When the current color visual feature matches the colorless and transparent feature range, and the number of consecutive matches reaches the second stable number, the second color change condition is automatically met and the titration is stopped.

[0115] In step 6, when determining the second color change condition, a titration over-control is set, specifically including:

[0116] Based on the rate of change of color visual characteristics during titration, the addition method of sodium thiosulfate standard solution is divided into a continuous titration stage, a decelerated titration stage, and a slow single-drop confirmation stage.

[0117] When the color visual characteristics are close to the light yellow characteristic range or the colorless and transparent characteristic range, reduce the dripping speed of the metering pump;

[0118] When the color visual features enter the near-end point range, the metering pump is controlled to add the color slowly in a single-drop manner, and after each drop, a preset mixing time is waited before the color image is collected.

[0119] If the color visual characteristics do not stabilize into the colorless and transparent characteristic region after slow single-drop addition, continue slow single-drop addition; if they stabilize into the colorless and transparent characteristic region, stop adding and record the final volume.

[0120] In practice, after the titration filtrate is transferred into the titration container 205, the main control unit starts the magnetic stirrer and the sodium thiosulfate standard solution metering pump, and the camera 109 continuously acquires images of the solution inside the titration container 205. Before titration begins, the system first acquires images of the container background and the initial solution to establish a color visual reference corresponding to the current illumination, container transmittance, and initial solution color. During titration, the image processing unit removes container edges, air bubbles, stirring vortices, and reflective areas, extracting only the RGB color values, HSV color values, and brightness values ​​from the effective solution area to form the current color visual characteristics.

[0121] When the current color visual feature falls into the light yellow feature range multiple times consecutively, the first color change condition is determined to be met, and the main control unit controls the liquid addition mechanism to add starch indicator. Titration then continues while color visual features are collected. When the color visual feature falls into the colorless and transparent feature range multiple times consecutively, the second color change condition is determined to be met, and titration stops. To avoid over-addition at the endpoint, the system automatically adjusts the dropping method based on the color change rate: continuous dropping when far from the endpoint, slowing down dropping as approaching the endpoint, and switching to single-drop confirmation near the endpoint. After each single drop, the system waits for the solution to mix thoroughly before judging the color state.

[0122] The above settings can reduce errors in color judgment by human eyes and reduce the impact of light, bubbles and stirring fluctuations on endpoint identification. At the same time, staged addition and single-drop confirmation can avoid excessive addition of sodium thiosulfate, improving the accuracy of endpoint volume recording and the repeatability of test results.

[0123] Step 7: Calculate the iodine adsorption value of activated carbon based on the concentration of iodine standard solution, the concentration of sodium thiosulfate standard solution, the amount of iodine standard solution added, the amount of sodium thiosulfate standard solution consumed, the actual mass of activated carbon powder, and the correction coefficient corresponding to the sample type, and generate a detection record.

[0124] In step 7, the iodine adsorption value of activated carbon is calculated as follows: E = C1 × V1 - 2.2 × C2 × V2 × 126.9 / m / K;

[0125] Where E is the iodine adsorption value of activated carbon, C1 is the concentration of iodine standard solution, V1 is the volume of iodine standard solution added, C2 is the concentration of sodium thiosulfate standard solution, V2 is the volume of sodium thiosulfate standard solution consumed, m is the actual mass of activated carbon powder, and K is the correction factor; when the sample type is new carbon, K is 0.9; when the sample type is old carbon, K is 0.86.

[0126] After calculation, the system generates a test record by combining the iodine adsorption value E with the sample number, sample type, sample mass, reagent concentration, added volume, titration volume consumed, detection time, and operator information. This record is stored in the data storage module and can be displayed on the screen or printed out as a test report. If any necessary parameter is missing, exceeds the allowable range, or is not locked during the calculation process, the system will not output the final result and will prompt the user to reconfirm the data source.

[0127] The above settings allow the iodine adsorption value calculation process to directly call upon automatically collected and locked data, reducing manual transcription and substitution errors. Simultaneously, matching correction coefficients for new and old char improves the adaptability of calculation results under different sample conditions. The automatic generation and saving of test records also facilitates subsequent quality traceability, batch comparison, and report management.

[0128] The process includes solution calibration and pipeline status verification before performing activated carbon iodine adsorption value testing.

[0129] After each batch of iodine standard solution and sodium thiosulfate standard solution is replaced, the reagent preparation date and calibration status should be read.

[0130] If the reagent has exceeded its preset expiration date or has not been calibrated, the sample testing process must be stopped, and a prompt will be made to perform solution calibration.

[0131] First, the sodium thiosulfate standard solution was automatically titrated and standardized using a reference solution, and then the iodine standard solution was automatically titrated and standardized using the standardized sodium thiosulfate standard solution.

[0132] In practice, before entering the sample testing process, the main control unit reads the preparation date, expiration date, and calibration status of each reagent, including iodine standard solution, sodium thiosulfate standard solution, and starch indicator. If any reagent exceeds its preset expiration date, has not been calibrated, or has missing calibration data, the main control unit will prevent the sample testing process from starting and will output a prompt to re-prepare or perform calibration on the display screen.

[0133] During solution calibration, the system first uses a reference solution to automatically titrate and calibrate the sodium thiosulfate standard solution, determines the titration endpoint by color recognition, and calculates the actual concentration of the sodium thiosulfate standard solution; then, it uses the calibrated sodium thiosulfate standard solution to automatically titrate and calibrate the iodine standard solution, obtains the actual concentration of the iodine standard solution, and saves it.

[0134] By setting the above parameters, expired reagents and uncalibrated solutions can be avoided from being used directly in the test, thus reducing the impact of reagent concentration deviations and liquid volume deviations on the iodine adsorption value results.

[0135] A rapid intelligent detector for activated carbon iodine adsorption value, used to implement any one of the rapid intelligent detection methods for activated carbon iodine adsorption value, comprising:

[0136] The machine body has a detection chamber, which contains a heating plate 201, a weighing platform, and a container station 106 for placing a filtrate container 204, a titration container 205, and a waste liquid container 206.

[0137] The main control unit, located inside the machine, is used to perform detection process control, data acquisition, color recognition result judgment, titration endpoint judgment, and iodine adsorption value calculation.

[0138] The main control screen 101 is connected to the main control unit and is used to input sample information, reagent concentration, sample type and detection parameters, and to display the detection status and detection results.

[0139] The pulverizing module is used to pulverize the activated carbon sample to be tested.

[0140] The heating and drying module has a ceramic flat heating plate 201 on top of a container containing activated carbon. The main control unit has built-in automatic heating, temperature rise and timing programs for temperature-controlled drying of activated carbon powder.

[0141] The fan cooling module 105 is located near the heating and drying module and is used to automatically start after drying to provide auxiliary cooling for containers containing activated carbon.

[0142] Weighing module 103 includes a gravity sensor for automatically acquiring the actual mass of activated carbon powder and iodine standard solution added;

[0143] The moving mechanism 107 is equipped with two moving mechanism modules in the horizontal and vertical directions and limit sensors, which are used to transfer containers or pick up and put in liquid addition components between the heating and drying module, the weighing module 103, the dissolving container 202, the filtrate container 204 and the titration container 205.

[0144] The liquid addition and titration module 108 includes multiple independently controlled metering pumps or peristaltic pumps and syringe plunger modules, which are used to deliver iodine standard solution, sodium thiosulfate standard solution, dilute hydrochloric acid, starch indicator and filtrate, respectively.

[0145] A filtration module is disposed between the dissolving container 202 and the filtrate container 204 for filtering the carbon-containing mixture;

[0146] The stirring module includes a dissolving mechanical stirrer and a titration magnetic stirrer, which are used for dissolving and mixing activated carbon powder with iodine standard solution and for mixing the titrant during titration, respectively.

[0147] The cleaning module is used to automatically clean pipes and containers after sample testing is completed;

[0148] The AI ​​color vision recognition module includes a camera 109, a light shield 104, and an image processing unit. The camera 109 is positioned facing the titration container 205 to capture visual images of the solution color during the titration process. The image processing unit is used to extract RGB color values, HSV color values, and brightness values. The AI ​​machine recognition system is then used to output the judgment results of the first and second color change conditions. The light shield 104 is used to ensure the stability of the system's light source and light.

[0149] The data storage and printing module 102 is connected to the main control unit and is used to store sample information, weighing data, reagent concentration, titration consumption, iodine adsorption value results and detection time, and print the test report according to the user's selection.

[0150] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A rapid and intelligent method for detecting the iodine adsorption value of activated carbon, characterized in that, include: Step 1: Obtain the sample type and detection parameters of the activated carbon sample to be tested; Step 2: The activated carbon sample to be tested is pulverized and then automatically dried according to the preset detection program; Step 3: Obtain the actual mass of the activated carbon powder, and the main control unit automatically determines whether the actual mass is within the allowable range of sample mass; Step 4: Iodine standard solution and dilute hydrochloric acid are automatically added to the container containing activated carbon powder, and stirring is automatically started to form a carbon-containing mixture. Step 5: Automatically filter the carbon-containing mixture and automatically extract a preset volume of the filtrate to be titrated. Step 6: Perform automatic titration of the filtrate to be titrated with sodium thiosulfate standard solution, while automatically and continuously acquiring the color image visual information of the solution in the titration container; when the color image visual information reaches the first color change condition, starch indicator is automatically added; continue titration and automatically stop titration when the color image visual information reaches the second color change condition, and automatically record the amount of sodium thiosulfate standard solution consumed. Step 7: The main control unit automatically calculates the iodine adsorption value of activated carbon.

2. The rapid and intelligent detection method for iodine adsorption value of activated carbon according to claim 1, characterized in that, In step 2, after the preset drying time is reached, the fan cooling module is automatically started and the container temperature is continuously collected. When the container temperature drops to the preset transfer temperature, the main control unit automatically releases the transfer interlock and allows the moving mechanism to perform the transfer operation.

3. The rapid and intelligent detection method for iodine adsorption value of activated carbon according to claim 1, characterized in that, Step 3, which involves obtaining and determining the actual mass of the activated carbon powder, includes: After heating and cooling are complete, the moving mechanism transfers the heating container to the weighing platform to weigh the effective mass of the charcoal powder. Determine whether the effective mass falls within the allowable range of 0.2g to 0.26g; if it is below the allowable range, an automatic sample replenishment prompt is output; if it is above the allowable range, an automatic sample reduction prompt is output; if it is within the allowable range, the effective mass is automatically locked and modification is prohibited during subsequent testing.

4. The rapid and intelligent detection method for iodine adsorption value of activated carbon according to claim 1, characterized in that, The automatic addition of iodine standard solution and dilute hydrochloric acid in step 4; The automatic dosing process of iodine standard solution includes: first, the peristaltic pump is automatically started to deliver 20 mL of iodine standard solution to a container placed on the weighing platform through the pipeline. The volume of the 20 mL solution is controlled by weighing based on the weight calculated by "volume × solution density". Before the iodine standard solution is added, the weighing platform automatically deducts the weight of the beaker and activated carbon and tare it. After the addition begins, when the mass of the weighing platform reaches the preset weight of "volume × solution density", the addition is completed and the process stops automatically. Beforehand, manually draw 2 mL of 5% hydrochloric acid using a plastic syringe and place it in the slot of the moving mechanism; after the iodine standard solution has been added, the push rod will be automatically activated to push the syringe and complete the one-time rapid addition of dilute hydrochloric acid; After the iodine standard solution and dilute hydrochloric acid have been added, the stirring program will start automatically.

5. The rapid and intelligent detection method for iodine adsorption value of activated carbon according to claim 1, characterized in that, Step 5, the automatic filtration of the carbon-containing mixture, includes: The vacuum filtration pump is started to introduce the carbon-containing mixture into the filtration assembly, which is a two-stage combined filtration membrane with a pore size of "1μm + 0.45μm". The main control unit automatically collects pump running time, filtration flow rate, and filtration pressure parameters during the filtration process; The system automatically determines whether the filter membrane is clogged or has any missing parts based on the parameters. If a blockage or missing component is detected, the filtrate sampling will be automatically stopped and a prompt to replace the filter membrane or reinstall the filter assembly will be output. If no abnormality is detected, 10 mL of filtrate will be automatically drawn from the filtrate container (204) and transferred to the titration container (205).

6. The rapid and intelligent detection method for iodine adsorption value of activated carbon according to claim 1, characterized in that, In step 6, the color image visual information includes at least two of the following: RGB color values, HSV color values, and luminance values. The first color change condition and the second color change condition are determined as follows: Before the titration begins, a high-definition camera automatically captures the background image of the titration container (205) and the initial solution image to establish a color visual benchmark under the current detection environment; During the titration process, the AI ​​color vision recognition module automatically and continuously acquires solution images and removes image areas corresponding to container edges, bubbles, stirring vortices, and external reflective areas. The system automatically extracts RGB color values, HSV color values, and brightness values ​​from the retained solution area and forms the current color visual characteristics. When the current color visual feature matches the light yellow feature range, and the number of consecutive matches reaches the first stable number, the first color change condition is automatically met and starch indicator is quickly and automatically added. After adding starch indicator, color visual features are collected again. When the current color visual feature matches the colorless and transparent feature range, and the number of consecutive matches reaches the second stable number, the second color change condition is automatically met and the titration is stopped.

7. The rapid and intelligent detection method for iodine adsorption value of activated carbon according to claim 6, characterized in that, In step 6, setting a titration over-control when determining the second color change condition specifically includes: Based on the rate of change of color visual characteristics during titration, the titration control program automatically divides the addition of sodium thiosulfate standard solution into a continuous addition stage, a decelerated addition stage, and a slow single-drop confirmation stage. When the color visual characteristics are close to the light yellow characteristic range or the colorless and transparent characteristic range, reduce the dripping speed of the metering pump; When the color visual features enter the near-end point range, the metering pump is automatically controlled to add the color visual image in a slow single-drop manner, and after each drop, a preset mixing time is waited before the color visual image is collected. If the color visual characteristics do not stabilize into the colorless and transparent characteristic region after slow single-drop addition, continue slow single-drop addition; if they stabilize into the colorless and transparent characteristic region, stop adding drops and record the final volume.

8. The rapid and intelligent detection method for iodine adsorption value of activated carbon according to claim 1, characterized in that, In step 7, the iodine adsorption value of activated carbon is calculated as follows: E = (C1 × V1 - 2.2 × C2 × V2) × 126.9 / m / K; Where E is the iodine adsorption value of activated carbon, C1 is the concentration of iodine standard solution, V1 is the volume of iodine standard solution added, C2 is the concentration of sodium thiosulfate standard solution, V2 is the volume of sodium thiosulfate standard solution consumed, m is the actual mass of activated carbon powder, and K is the correction coefficient; when the sample type is new carbon, K is 0.9; when the sample type is old carbon, K is 0.

86.

9. The rapid and intelligent detection method for iodine adsorption value of activated carbon according to claim 1, characterized in that, Before performing activated carbon iodine adsorption value testing, the following steps are also included: solution calibration and pipeline status verification: After each batch of iodine standard solution and sodium thiosulfate standard solution is replaced, the reagent preparation date and calibration status should be read. If the reagent has exceeded its preset expiration date or has not been calibrated, the sample testing process must be stopped, and a prompt will be made to perform solution calibration. First, the sodium thiosulfate standard solution was automatically titrated and standardized using a reference solution. Then, the iodine standard solution was automatically titrated and standardized using the standardized sodium thiosulfate standard solution.

10. A rapid intelligent detector for activated carbon iodine adsorption value, used to implement the rapid intelligent detection method for activated carbon iodine adsorption value according to any one of claims 1 to 9, characterized in that, include: The body, wherein a detection chamber is provided inside the body; The main control unit, located inside the machine, is used to perform detection process control, data acquisition, color visual recognition result judgment, titration endpoint judgment, and iodine adsorption value calculation. The pulverizing module is used to pulverize the activated carbon sample to be tested. The heating and drying module is used for temperature-controlled drying of activated carbon powder; The weighing module is used to automatically obtain the actual mass of activated carbon powder and iodine standard solution added. A moving mechanism for transferring containers or picking up and placing liquid filling parts; The liquid addition and titration module is used to deliver iodine standard solution, sodium thiosulfate standard solution, filtrate, and to add dilute hydrochloric acid and starch indicator. A filtration module is used to filter carbon-containing mixtures. The stirring module is used for dissolving and mixing activated carbon powder with iodine standard solution and for mixing the titrant during titration. The AI ​​color vision recognition module includes a camera and an image processing unit. The camera is used to acquire visual images of the solution color during the titration process, and the image processing unit is used to output the judgment results of the first color change condition and the second color change condition.

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