A renewable disposal method and system for waste activated carbon

Abstract

The present application relates to the technical field of waste activated carbon regeneration spectrum analysis, and specifically to a method and system for the regeneration of waste activated carbon, the method comprising: placing waste activated carbon particles on a quartz dish and placing it in a microwave high-temperature heating furnace, evacuating the furnace to a vacuum, and introducing a protective gas; then performing microwave heating to cause an activation reaction; after microwave heating and heat preservation, the temperature is lowered to room temperature, the introduction of the protective gas is stopped, and an activated carbon regeneration particle sample is obtained; during the microwave regeneration process, the pore structure stability is determined according to the difference between each Raman spectrum intensity of each pixel in the spectrum image of the activated carbon regeneration particle sample and the mutation point in the Raman spectrum intensity of each pixel, and the pore blockage significance of each pixel is analyzed to obtain the pore structure disorder of each pixel, obtain the carbon loss ratio, and feedback adjust the microwave power to obtain the next batch of waste activated carbon regeneration particles. The present application can improve the regeneration effect of waste activated carbon.

Description

Technical Field

[0001] The present application relates to the technical field of waste activated carbon regeneration spectral analysis, and in particular to a regenerative disposal method and system for waste activated carbon. Background Art

[0002] With the continuous development of environmental protection and environmental governance, people's environmental awareness continues to increase. Activated carbon has a highly developed pore structure and a high specific surface area, and its surface has a variety of oxygen-containing functional groups, which have good adsorption properties in both gas and liquid phases, so activated carbon is widely used in wastewater and waste gas treatment. However, organically contaminated waste activated carbon has the characteristics of hazardous waste. Treating waste activated carbon by incineration or landfilling is very likely to cause environmental pollution, so recycling waste activated carbon is an inevitable choice for green development.

[0003] At present, the regeneration methods of waste activated carbon mainly include thermal regeneration, electrochemical regeneration, wet catalytic oxidation regeneration, microwave regeneration, etc. Among them, thermal regeneration is widely used and is a relatively mature regeneration method in industry. The existing technology uses microwave regeneration method based on the property of molecular heating. The porous surface of waste activated carbon can absorb microwaves and accept microwave energy through dipole rotation and ion conduction, so that the waste activated carbon is evenly heated and the thermal desorption effect of adsorbent is improved.

[0004] However, there are some problems with the microwave regeneration method. When regenerating waste activated carbon, the existing technology cannot effectively adjust the microwave power, which easily leads to excessive carbon loss in the waste activated carbon, causing the pores of the waste activated carbon to be blocked, thereby affecting the regeneration effect of the waste activated carbon. Therefore, the traditional microwave regeneration technology cannot effectively adjust the microwave power, which leads to the problem that the pores of the waste activated carbon are easily blocked, thereby affecting the regeneration effect of the waste activated carbon. Summary of the invention

[0005] In order to solve the above technical problems, the purpose of this application is to provide a renewable disposal method and system for waste activated carbon. The technical solutions adopted are as follows:

[0006] The present application embodiment provides a method for regenerating waste activated carbon, comprising the following steps:

[0007] The waste activated carbon particles are placed on a quartz dish and then placed on a silicon carbide plate in a microwave high-temperature heating furnace;

[0008] Evacuate the microwave high-temperature heating furnace to a vacuum state, open the air inlet valve of the microwave high-temperature heating furnace, and introduce protective gas into the furnace;

[0009] Then, the waste activated carbon particles are heated and desorbed by microwaves, and the waste activated carbon reacts with the protective gas and water vapor introduced into the furnace to undergo activation reaction;

[0010] The tail gas of the reaction is treated, and after microwave heating and heat preservation, the temperature is lowered to room temperature, and the introduction of protective gas is stopped to obtain an activated carbon regeneration particle sample;

[0011] During the microwave regeneration process, the Raman spectrum data of the activated carbon particle samples on the quartz dish after the current batch of regeneration treatment is collected;

[0012] Determine the pore structure stability of each Raman spectrum intensity in each pixel according to the difference between each Raman spectrum intensity in each pixel and the mutation point in the Raman spectrum intensity of each pixel;

[0013] The pore structure stability of all Raman spectral intensities in each pixel constitutes the structural stability vector of each pixel;

[0014] Based on the disorder degree and abnormality of the pore structure stability in the structural stability vector, the pore blockage significance of each pixel is determined, and then the pore structure disorder degree of each pixel is determined by combining the similarity degree of the structural stability vector between each pixel and the pixels in its local range;

[0015] The pixels are segmented based on the disorder of pore structure to extract carbon loss pixels, and the carbon loss ratio is obtained by combining the number of carbon loss pixels.

[0016] Based on the carbon loss ratio and in combination with the preset microwave power for microwave regeneration of the current batch of waste activated carbon, the microwave power for microwave regeneration of the next batch of waste activated carbon is obtained to obtain the next batch of regenerable waste activated carbon particles.

[0017] Preferably, the vacuum degree in the microwave high-temperature heating furnace is controlled at 0.08-0.09 MPa.

[0018] Preferably, the protective gas is nitrogen.

[0019] Preferably, during the microwave heating process, the preset microwave power is 800 W, the insulation temperature range is 500-600° C., and the insulation time is 10-20 min.

[0020] Preferably, the calculation formula corresponding to the pore structure stability of each Raman spectrum intensity in each pixel is:

[0021] , where is the pore structure stability of the jth Raman spectrum intensity in the ith pixel, is the normalization function, is the jth Raman spectrum intensity in the Raman intensity sequence of the i-th pixel, wherein all Raman spectrum intensities in the Raman spectrum data of each pixel are arranged in ascending order of wavelength to form the Raman intensity sequence of each pixel, is the number of mutation points in the Raman intensity mutation sequence of the i-th pixel, where all mutation points in the Raman intensity mutation sequence of each pixel are arranged in ascending order of wavelength to form the Raman intensity mutation sequence of each pixel, is the Euclidean distance function, is the Raman spectrum intensity corresponding to the sth mutation point in the Raman intensity mutation sequence of the ith pixel.

[0022] Preferably, the calculation formula corresponding to the pore blockage significance of each pixel is:

[0023] , where is the pore blockage significance of the i-th pixel, is the information entropy of all elements in the structural stability vector of the i-th pixel, and are respectively the mean of all abnormal data points and the mean of all normal data points in the structural stability vector of the i-th pixel, wherein anomaly detection is performed on the structural stability vector to extract all abnormal data points and normal data points.

[0024] Preferably, the calculation formula for the pore structure disorder degree of each pixel is:

[0025] , where is the pore structure disorder degree of the i-th pixel, is the number of pixels in the local pixel set, where the local pixel set of each pixel is composed of multiple pixels closest to each pixel. is the cosine similarity function, is the structural stability vector of the i-th pixel, is the structural stability vector of the g-th local pixel in the local pixel set of the i-th pixel, is the cosine similarity, To avoid values ​​with a denominator of zero.

[0026] Preferably, the carbon loss pixels are pixels corresponding to the pore structure disorder degree higher than the segmentation threshold, and the carbon loss ratio is the ratio of the number of carbon loss pixels to the total number of pixels.

[0027] Preferably, the corresponding calculation process of the microwave power during the microwave regeneration of the next batch of waste activated carbon is:

[0028] , where is the microwave power for the next batch of waste activated carbon microwave regeneration, The preset microwave power for the microwave regeneration of the current batch of spent activated carbon. is the carbon loss ratio, It is the adjustment coefficient of preset microwave power.

[0029] An embodiment of the present application also provides a renewable disposal system for waste activated carbon, the system comprising a memory, a processor, and a computer program stored in the memory and running on the processor, and the processor implements the steps of any one of the above methods when executing the computer program.

[0030] From the above, it can be seen that the method and system for regenerating waste activated carbon provided by the present application have at least the following beneficial effects:

[0031] Compared with the prior art, the present application cannot effectively feedback-regulate the microwave power of microwave regeneration, which easily leads to excessive carbon loss in the waste activated carbon, causing the pores of the waste activated carbon to be blocked, thereby affecting the regeneration efficiency of the waste activated carbon. The present invention extracts the stability characteristics of the pore structure of the activated carbon particle sample and the significant characteristics of pore blockage. The more obvious the pore blockage characteristics of the activated carbon particle sample are, the lower the suitability of the microwave power for microwave regeneration is; further, the carbon loss characteristics are analyzed through the chaotic characteristics of the pore structure of the activated carbon particle sample to obtain the carbon loss ratio of the current activated carbon particle sample. The carbon loss ratio can more accurately reflect the suitability of the microwave power. The higher the carbon loss ratio is, the lower the suitability of the microwave power is. Therefore, the present invention uses the carbon loss ratio to effectively feedback-regulate the microwave power, avoids the phenomenon of excessive carbon loss in the waste activated carbon, and improves the regeneration effect of the waste activated carbon. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the technical solutions and advantages in the embodiments of the present application or the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0033] Figure 1 A flow chart of the steps of a regenerable disposal method for waste activated carbon provided in this application;

[0034] Figure 2 A schematic diagram showing the comparison of the spectral intensity between the normal pore structure and the abnormal pore structure provided in this application;

[0035] Figure 3 A schematic diagram of abnormal detection results of all pore structure stability in the structural stability vector is provided for this application;

[0036] Figure 4 The microwave power adjustment flow chart provided for this application. DETAILED DESCRIPTION

[0037] In order to further explain the technical means and effects adopted by the present application to achieve the predetermined invention purpose, the following is a detailed description of the specific implementation method, structure, characteristics and effects of a renewable disposal method and system for waste activated carbon proposed in the present application, in combination with the accompanying drawings and preferred embodiments. In the following description, different "one embodiment" or "another embodiment" does not necessarily refer to the same embodiment. In addition, specific features, structures or characteristics in one or more embodiments may be combined in any suitable form.

[0038] Unless otherwise specified and limited, terms such as "comprises", "comprising" or any other variants thereof are intended to cover non-exclusive inclusion, so that a circuit structure, article or device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such articles or devices. In the absence of further restrictions, an element defined by the sentence "comprising a ..." does not exclude the presence of other identical elements in the article or device including the element. In addition, the term "and\or" used herein includes any and all combinations of one or more related listed items. All technical and scientific terms used herein have the same meaning as those commonly understood by technicians in the technical field of this application.

[0039] The specific scheme of a method and system for regenerating and disposing waste activated carbon provided by the present application is described in detail below with reference to the accompanying drawings.

[0040] See also Figure 1 , which shows a flow chart of a method for regenerating waste activated carbon provided by an embodiment of the present application, comprising the following steps:

[0041] The purpose of this embodiment is to effectively adjust the microwave power in the microwave regeneration method to avoid the clogging of the pores of the waste activated carbon and improve the regeneration effect of the waste activated carbon.

[0042] In this embodiment, microwave regeneration technology is used to achieve the regeneration of waste activated carbon. The implementation steps of microwave regeneration technology are as follows:

[0043] S1, placing the waste activated carbon particles on a quartz dish, and then placing it on a silicon carbide plate in a microwave high-temperature heating furnace.

[0044] S2, regeneration environment treatment: evacuate the microwave high temperature heating furnace to a vacuum, open the air inlet valve of the microwave high temperature heating furnace, and introduce protective gas into the furnace.

[0045] In this embodiment, the environment inside the microwave high-temperature heating furnace is evacuated to a vacuum state by a vacuum pump, and the vacuum degree inside the microwave high-temperature heating furnace is controlled at 0.08-0.09MPa. Then, the air inlet valve of the microwave high-temperature heating furnace is opened to introduce a protective gas into the furnace, wherein the protective gas is nitrogen.

[0046] S3, then the waste activated carbon particles are subjected to microwave heating and desorption, and the waste activated carbon undergoes activation reaction with the introduced protective gas and water vapor in the furnace.

[0047] In this embodiment, the preset microwave power of the microwave heating program is 800W, the insulation temperature range is 500-600℃, and the insulation time is 10-20min. The waste activated carbon particles in the microwave high-temperature heating furnace are heated by microwaves. The waste activated carbon particles are heated in the microwave high-temperature heating furnace, and the adsorbed inorganic substances and high-boiling point organic substances are desorbed. At the same time, the waste activated carbon reacts with the protective gas and water vapor introduced at high temperature in the furnace to activate the activated carbon, thereby realizing the micropore reconstruction of the activated carbon.

[0048] S4, treating the tail gas of the reaction: the tail gas treatment process can be treated by the tail gas treatment method in the prior art. Specifically, in this embodiment, the waste gas generated in the regeneration process is condensed through a U-shaped tube, and the residual organic waste is absorbed by an alcohol bottle filled with alcohol, and then the residual acidic substances are secondary absorbed by an alkali bottle filled with alkali solution, and then discharged outdoors.

[0049] S5, after the microwave heating and insulation is completed, the temperature is cooled to room temperature and the introduction of protective gas is stopped to obtain the activated carbon regeneration particle sample.

[0050] In order to improve the regeneration efficiency of the waste activated carbon, in this embodiment, the spectrum data of the activated carbon particle sample on the quartz dish is analyzed to adjust the microwave power during the microwave regeneration of the waste activated carbon, so as to achieve efficient regeneration of the waste activated carbon. The specific process is as follows:

[0051] Step 1: During the microwave treatment process, collect Raman spectrum data of the activated carbon particle sample on the quartz dish after the current batch of regeneration treatment.

[0052] In order to effectively adjust the microwave power in the microwave regeneration method, the Raman spectrum of the activated carbon particle sample on the quartz dish after the current regeneration treatment was collected by Raman imaging spectrometer to obtain the Raman spectrum data of each pixel in the activated carbon particle sample;

[0053] The Raman spectrum data of each pixel are preprocessed, and a sequence consisting of all Raman spectrum intensities in the Raman spectrum data of each pixel arranged in ascending order of wavelength is used as the Raman light intensity sequence of each pixel.

[0054] Step 2: Determine the pore structure stability of each Raman spectrum intensity in each pixel based on the difference between each Raman spectrum intensity in each pixel and the mutation point in the Raman spectrum intensity of each pixel.

[0055] Generally speaking, the microwave power of the microwave heating program determines the regeneration temperature in the waste activated carbon. A higher microwave power will cause excessive carbon loss in the waste activated carbon, resulting in blockage of the pores of the waste activated carbon; while a lower microwave power will easily cause incomplete regeneration of the waste activated carbon.

[0056] In order to effectively control and adjust the microwave power of the waste activated carbon regeneration, it is necessary to analyze the pore structure characteristics of the activated carbon particle sample after the current regeneration treatment. When the pore structure at a certain pixel position in the activated carbon particle sample changes significantly, it is an abnormal pore structure. At this time, the change in the Raman spectrum intensity is prone to sudden changes. The schematic diagram of the spectral intensity comparison between normal pore structure and abnormal pore structure is shown in Figure 2 As shown, Figure 2 In the figure, the horizontal axis is the wavelength and the vertical axis is the Raman spectrum intensity.

[0057] In order to analyze the mutation characteristics of the Raman spectral intensity at the pixel position, in this embodiment, the Raman intensity sequence of each pixel is used as the input of the Pettitt mutation point detection algorithm. In this embodiment, the significance level parameter in the Pettitt mutation point detection algorithm is taken as 0.05, and the Pettitt mutation point detection algorithm outputs all the mutation points in the Raman intensity sequence of each pixel, wherein the Pettitt mutation point detection algorithm is a well-known technology, and the specific process will not be repeated here.

[0058] In order to characterize the pore structure characteristics of the Raman spectrum intensity corresponding to each wavelength, all the mutation points in the Raman intensity sequence of each pixel are arranged in ascending order of wavelength as the Raman intensity mutation sequence of each pixel. The Raman intensity mutation sequence reflects the mutation characteristics of the pore structure at the corresponding position of the pixel to a certain extent. At the same time, the smaller the similarity distance between the Raman spectrum intensity in the Raman intensity sequence and the mutation point in the Raman intensity mutation sequence, the greater the correlation between the pore structure characteristics of the Raman spectrum intensity and the pore structure mutation characteristics, which to a certain extent indicates that the stability of the pore structure of the waste activated carbon at this position is worse, and the activated carbon particle sample is more likely to have a large carbon loss phenomenon during the regeneration process.

[0059] Based on the above analysis, the pore structure stability of each Raman spectrum intensity in each pixel is calculated:

[0060] , where is the pore structure stability of the jth Raman spectrum intensity in the ith pixel, is the normalization function, is the number of mutation points in the Raman intensity mutation sequence of the i-th pixel, is the Euclidean distance function, is the jth Raman spectrum intensity in the Raman light intensity sequence of the i-th pixel, is the Raman spectrum intensity corresponding to the sth mutation point in the Raman light intensity mutation sequence of the i-th pixel. The larger the Euclidean distance between the Raman spectrum intensities, the smaller the similarity between the pore structure characteristics corresponding to the Raman spectrum intensity and the pore structure mutation characteristics, which means that the stability of the pore structure is higher, and the greater the pore structure stability.

[0061] Generally speaking, the greater the change in the pore structure stability at a certain pixel position, the higher the abnormality of the pore structure stability change under Raman spectra of different wavelengths, and the more it conforms to the characteristics of pore blockage caused by carbon loss. At this time, the microwave power for regenerating the waste activated carbon is less suitable to continue, and the more effective control and adjustment of the microwave power is needed.

[0062] In order to accurately identify the characteristics of pore blockage caused by carbon loss, so as to facilitate the subsequent effective adjustment of the microwave power of microwave regeneration, the vector composed of the pore structure stability of all Raman spectral intensities in each pixel is recorded as the structural stability vector of each pixel. The structural stability vector reflects the changes in the pore structure stability characteristics at the pixel position. The larger the abnormal characteristics appearing in the structural stability vector, the more likely it is that it is caused by pore blockage.

[0063] Step 3: Based on the disorder degree and abnormality of the pore structure stability in the structural stability vector, determine the pore blockage significance of each pixel, and then determine the pore structure disorder degree of each pixel based on the similarity of the structural stability vector between each pixel and the pixels in its local range.

[0064] In order to analyze the abnormal characteristics in the structural stability vector, all elements in the structural stability vector of each pixel are used as the input of the local anomaly factor algorithm. In this embodiment, the neighborhood parameter value in the anomaly detection algorithm is 12, the anomaly ratio is 0.1, and the local anomaly factor algorithm outputs all abnormal data in the structural stability vector. The local anomaly factor algorithm is a well-known technology, and the specific process is not repeated here. In this embodiment, the schematic diagram of the anomaly detection result using the local anomaly factor for anomaly detection is shown in FIG. Figure 3 As shown, Figure 3 The data in the middle circle are abnormal data, and the data in the dots are normal data.

[0065] Normally, the abnormal data in the structural stability vector can reflect the characteristics of the pore blockage phenomenon. If the difference between the abnormal data in the structural stability vector and the remaining normal data is larger, and the degree of disorder in the structural stability vector is higher, it means that the pore blockage characteristics at the pixel position are more obvious to a certain extent, and the suitability of the microwave power for microwave regeneration is lower.

[0066] Based on the above analysis, the pore blockage significance of each pixel is determined based on the disorder degree and abnormality of the pore structure stability in the structural stability vector. The expression in this embodiment is:

[0067] , where is the pore blockage significance of the i-th pixel, is the information entropy of all elements in the structural stability vector of the i-th pixel, and are the mean of all abnormal data points and the mean of all normal data points in the structural stability vector of the i-th pixel, respectively. The larger the information entropy and the greater the difference between the mean of abnormal data points and the mean of normal data points, the higher the degree of disorder in the structural stability vector and the greater the difference between abnormal data and normal data, which reflects that the greater the significance of the pore blockage characteristics at the pixel position, the greater the significance of pore blockage.

[0068] Generally speaking, the greater the degree of disorder of the pore structure change in a certain pixel local area on the regenerated activated carbon particle sample, the worse the effect of microwave power in the regeneration process, and the more likely it is to produce greater carbon loss. For example, the disorder characteristics such as pore blockage, carbon skeleton structure collapse, and ablation in the activated carbon indicate to a certain extent that the microwave power is too high in the current regeneration process, causing the absorption of microwaves inside the waste activated carbon to become unstable, making the pore structure disorder degree of the local area of ​​the pixel at a high level. Therefore, at this time, it is more necessary to effectively control and adjust the microwave power of the microwave regeneration process to improve the regeneration effect of the waste activated carbon.

[0069] In order to analyze the degree of disorder of the pore structure in the local area of ​​the pixel, in this embodiment, a set of K pixels with the closest Euclidean distance to each pixel is recorded as the local pixel set of each pixel. In this embodiment, the value of K is 10. The greater the difference between the structural stability vectors of the pixel and its local pixel, and the more significant the pore blocking characteristics at the pixel position, the higher the degree of disorder of the pore structure in the local area of ​​the pixel.

[0070] Based on the above analysis, the pore structure disorder of each pixel is calculated according to the pore blockage significance of each pixel and the similarity between the structural stability vector of each pixel and the pixels in its local range. The expression is:

[0071] , where is the pore structure disorder degree of the i-th pixel, is the size of the local pixel set, is the cosine similarity function, is the structural stability vector of the i-th pixel, is the structural stability vector of the g-th local pixel in the local pixel set of the i-th pixel, To avoid a value with a denominator of zero, the value in this embodiment is taken as 0.1. The smaller the cosine similarity and the greater the pore blockage significance, to a certain extent, the more it can be explained that the degree of disorder of the pore structure in the local area of ​​the pixel is higher, and the greater the degree of disorder of the pore structure, the more likely it is that a large carbon loss will occur.

[0072] Step 4: Segment the pixels based on the disorder of the pore structure to extract the carbon loss pixels, and obtain the carbon loss ratio based on the number of carbon loss pixels.

[0073] Generally speaking, the greater the degree of disorder of the pore structure change in the local area of ​​the pixel, to a certain extent, it indicates that the microwave power is too large during the current regeneration process, causing the absorption of microwaves inside the waste activated carbon to become unstable and resulting in a large carbon loss phenomenon. At this time, it is more necessary to control and adjust the microwave power during microwave regeneration. In order to effectively control and adjust the microwave power during microwave regeneration, it is necessary to further analyze the carbon loss characteristics of the current activated carbon particle sample.

[0074] Specifically, in this embodiment, the pore structure disorder corresponding to all pixels is used as the input of the maximum inter-class variance algorithm, and the segmentation threshold of all pore structure disorder is output, and the pixels corresponding to the pore structure disorder higher than the segmentation threshold are used as carbon loss pixels, wherein the maximum inter-class variance algorithm is a well-known technology, and the specific process will not be repeated here.

[0075] The greater the proportion of carbon loss pixels, to a certain extent, it can reflect that the current activated carbon particle sample has a greater carbon loss during the regeneration process, resulting in a poor regeneration effect of the activated carbon after regeneration. In order to extract the carbon loss characteristics of the current activated carbon particle sample, the ratio of the number of carbon loss pixels to the total number of pixels is taken as the carbon loss ratio of the current batch of activated carbon particle samples. The greater the carbon loss ratio, the greater the microwave power of the current activated carbon particle sample during the regeneration process, and the more effective control and adjustment of the microwave power is needed to improve the regeneration effect of the next batch of regenerated activated carbon particles.

[0076] Step 5: Based on the carbon loss ratio and in combination with the preset microwave power for microwave regeneration of the current batch of waste activated carbon, the microwave power for microwave regeneration of the next batch of waste activated carbon is obtained to obtain the next batch of regenerable waste activated carbon particles.

[0077] The microwave power for the next batch of microwave regeneration is controlled and adjusted based on the carbon loss ratio of the current activated carbon particle sample. The higher the carbon loss ratio, the greater the carbon loss amount generated and the greater the degree of microwave power reduction. Conversely, the lower the carbon loss ratio, the smaller the carbon loss amount generated and the smaller the degree of microwave power reduction.

[0078] Therefore, this embodiment calculates the microwave power when the next batch of waste activated carbon is subjected to microwave regeneration:

[0079] , where is the microwave power for the next batch of waste activated carbon microwave regeneration, is the preset microwave power for microwave regeneration of the current batch of waste activated carbon, which is 800W in this embodiment. is the carbon loss ratio, It is the adjustment coefficient of the preset microwave power, which is used to limit the range of microwave power. In this embodiment, the value is 100W.

[0080] The microwave power for the next batch of waste activated carbon during microwave regeneration can be determined through the above process, and the next batch of waste activated carbon can be subjected to microwave regeneration treatment using steps S1-S5 to obtain regenerated activated carbon, thereby ensuring the regeneration effect of the waste activated carbon.

[0081] Specifically, the microwave power adjustment flow chart of the microwave regeneration process in this embodiment is as follows: Figure 4 shown.

[0082] Furthermore, in order to verify the quality of the sample regenerated after adjusting the microwave power during the microwave regeneration process in this embodiment, this embodiment provides the following data comparison table before and after adjusting the microwave power, and compares multiple samples from the previous and next batches, as shown in Table 1.

[0083] Table 1

[0084]

[0085] Samples 1, 2, 3, and 4 in Table 1 are samples obtained by regenerating waste activated carbon before microwave power control and adjustment, wherein the carbon loss ratio is also obtained by the method of steps 1 to 4 in the embodiment of the present application, and the proportion of carbon loss pixels is analyzed to obtain the carbon loss ratio; samples 5, 6, 7, and 8 are samples obtained by regenerating waste activated carbon after microwave power control and adjustment. It can be seen from the above table that after controlling and adjusting the microwave power by the method in this example, the carbon loss ratio is significantly reduced, and at the same time, the specific surface area of ​​the activated carbon is improved.

[0086] To sum up, compared with the prior art, which cannot effectively feedback-regulate the microwave power of microwave regeneration, it is easy to cause excessive carbon loss in the waste activated carbon, resulting in blockage of the pores of the waste activated carbon, thereby affecting the regeneration efficiency of the waste activated carbon. The above method of this embodiment analyzes the stability characteristics of the pore structure of the activated carbon particle sample and the significance characteristics of the pore blockage. The more obvious the pore blockage characteristics of the activated carbon particle sample, the lower the suitability of the microwave power for microwave regeneration; further, the carbon loss characteristics are analyzed through the chaotic characteristics of the pore structure of the activated carbon particle sample to obtain the carbon loss ratio of the current activated carbon particle sample. The carbon loss ratio can more accurately reflect the suitability of the microwave power. Therefore, the present invention uses the carbon loss ratio to effectively feedback-regulate the microwave power to avoid the phenomenon of excessive carbon loss in the waste activated carbon and improve the regeneration effect of the waste activated carbon.

[0087] Based on the same inventive concept as the above method, an embodiment of the present application also provides a renewable disposal system for waste activated carbon, including a memory, a processor, and a computer program stored in the memory and running on the processor, and when the processor executes the computer program, the steps of any one of the above-mentioned methods for renewable disposal of waste activated carbon are implemented.

[0088] It is to be understood that the sequence of the embodiments of the present application described above is for description only and does not represent the advantages and disadvantages of the embodiments. The above describes specific embodiments of the present specification. In addition, the processes depicted in the accompanying drawings do not necessarily require the specific order or continuous order shown to achieve the desired results. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0089] The various embodiments in this specification are described in a progressive manner, and the same or similar parts between the various embodiments can be referenced to each other, and each embodiment focuses on the differences from other embodiments.

[0090] The above content is only an implementation method of the present application and is not intended to limit the scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly used in other related technical fields, are also included in the protection scope of the present application.

Claims

1. A method for regenerating waste activated carbon, characterized in that: The following steps are involved: The waste activated carbon particles are placed on a quartz dish and then placed on a silicon carbide plate in a microwave high-temperature heating furnace; Evacuate the microwave high-temperature heating furnace to a vacuum state, open the air inlet valve of the microwave high-temperature heating furnace, and introduce protective gas into the furnace; Then, the waste activated carbon particles are heated and desorbed by microwaves, and the waste activated carbon reacts with the protective gas and water vapor introduced into the furnace to undergo activation reaction; The tail gas of the reaction is treated, and after microwave heating and heat preservation, the temperature is lowered to room temperature, and the introduction of protective gas is stopped to obtain an activated carbon regeneration particle sample; During the microwave regeneration process, the Raman spectrum data of the activated carbon particle samples on the quartz dish after the current batch of regeneration treatment is collected; Determine the pore structure stability of each Raman spectrum intensity in each pixel according to the difference between each Raman spectrum intensity in each pixel and the mutation point in the Raman spectrum intensity of each pixel; The pore structure stability of all Raman spectral intensities in each pixel constitutes the structural stability vector of each pixel; Based on the disorder degree and abnormality of the pore structure stability in the structural stability vector, the pore blockage significance of each pixel is determined, and then the pore structure disorder degree of each pixel is determined by combining the similarity degree of the structural stability vector between each pixel and the pixels in its local range; The pixels are segmented based on the disorder of pore structure to extract carbon loss pixels, and the carbon loss ratio is obtained by combining the number of carbon loss pixels. Based on the carbon loss ratio, combined with the preset microwave power for microwave regeneration of the current batch of waste activated carbon, the microwave power for microwave regeneration of the next batch of waste activated carbon is obtained to obtain the next batch of regenerable waste activated carbon particles; The corresponding calculation formula for the pore structure stability of each Raman spectrum intensity in each pixel is: , where is the pore structure stability of the jth Raman spectrum intensity in the ith pixel, is the normalization function, is the jth Raman spectrum intensity in the Raman intensity sequence of the i-th pixel, wherein all Raman spectrum intensities in the Raman spectrum data of each pixel are arranged in ascending order of wavelength to form the Raman intensity sequence of each pixel, is the number of mutation points in the Raman intensity mutation sequence of the i-th pixel, where all mutation points in the Raman intensity mutation sequence of each pixel are arranged in ascending order of wavelength to form the Raman intensity mutation sequence of each pixel, is the Euclidean distance function, is the Raman spectrum intensity corresponding to the s-th mutation point in the Raman light intensity mutation sequence of the i-th pixel; The process of acquiring the mutation point is as follows: taking the Raman light intensity sequence of each pixel as the input of the mutation point detection algorithm, and outputting all the mutation points in the Raman light intensity sequence of each pixel; The corresponding calculation formula for the pore blockage significance of each pixel is: , where is the pore blockage significance of the i-th pixel, is the information entropy of all elements in the structural stability vector of the i-th pixel, and are respectively the mean of all abnormal data points and the mean of all normal data points in the structural stability vector of the i-th pixel, wherein the structural stability vector is subjected to anomaly detection to extract all abnormal data points and normal data points; The calculation formula of the pore structure disorder degree of each pixel is: , where is the pore structure disorder degree of the i-th pixel, is the number of pixels in the local pixel set, where the local pixel set of each pixel is composed of multiple pixels closest to each pixel. is the cosine similarity function, is the structural stability vector of the i-th pixel, is the structural stability vector of the g-th local pixel in the local pixel set of the i-th pixel, To avoid values ​​with a denominator of zero; The carbon loss pixel is a pixel corresponding to a pore structure disorder degree higher than a segmentation threshold, and the carbon loss ratio is a ratio of the number of carbon loss pixels to the total number of pixels; The corresponding calculation process of microwave power during microwave regeneration of the next batch of waste activated carbon is: , where is the microwave power for the next batch of waste activated carbon microwave regeneration, The preset microwave power for the microwave regeneration of the current batch of spent activated carbon. is the carbon loss ratio, It is the adjustment coefficient of preset microwave power.

2. A renewable disposal method for waste activated carbon according to claim 1, characterized in that: The vacuum degree in the microwave high temperature heating furnace is controlled at 0.08-0.09 MPa.

3. The method for regenerating waste activated carbon according to claim 1, characterized in that: The protective gas is nitrogen.

4. A renewable disposal method for waste activated carbon according to claim 1, characterized in that: During the microwave heating process, the preset microwave power is 800W, the insulation temperature range is 500-600°C, and the insulation time is 10-20min.

5. A regenerable disposal system for waste activated carbon, comprising a memory, a processor, and a computer program stored in the memory and running on the processor, characterized in that: When the processor executes the computer program, the steps of the method according to any one of claims 1 to 4 are implemented.

Images