Activated carbon adsorption and desorption system and method

Abstract

The application provides an activated carbon adsorption and desorption system and method, when the current adsorption capacity of activated carbon adsorbent in an adsorption link is higher than the critical adsorption capacity of the activated carbon adsorbent, the bed heat storage compensation of the standard temperature in a desorption link is carried out through the temperature fluctuation characteristics of the adsorption bed in the adsorption link and the ambient temperature of the adsorption bed, and the heat storage compensation temperature of each desorption stage in the desorption link is obtained; the activated carbon adsorbent is subjected to stage desorption based on the desorption time length of each desorption stage in the desorption link and all the heat storage compensation temperatures, the desorption residual amount of pollutants in the activated carbon adsorbent is extracted from the pollutant concentration information at the stage desorption outlet; the effective desorption rate of the activated carbon adsorbent is determined through the desorption residual amount and the current adsorption capacity, and the critical adsorption capacity of the activated carbon adsorbent in the next cycle is updated based on the effective desorption rate. The bed heat storage compensation in the activated carbon critical adsorption capacity updating can be realized based on the above scheme.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of activated carbon adsorption and desorption technology, and more particularly, to an activated carbon adsorption and desorption system and method. BACKGROUND

[0002] Activated carbon adsorption and desorption is a common wastewater treatment technology, mainly used for removing harmful substances in industrial wastewater. In the process of industrial production, many processes will produce wastewater containing harmful gases. If not treated before discharge, it will cause serious pollution to the environment and even harm human health.

[0003] In the existing activated carbon adsorption and desorption system, the traditional temperature control method often uses a fixed standard temperature for desorption operation, and does not fully consider the actual thermal state formed in the bed during the adsorption stage. Since the pollutants will produce exothermic reaction during the adsorption process, the heat accumulated in different regions of the bed will have significant differences. The existing technology lacks a dynamic perception and compensation mechanism for this non-uniform thermal field. When the system switches to the desorption stage, the fixed temperature heating method cannot meet the actual heat accumulation needs of each part of the bed, causing local areas to have insufficient or excessive temperature. The area with insufficient temperature cannot effectively desorb the pollutants, resulting in a large amount of undesorbed substances remaining in the micropores of the activated carbon; while the area with excessive temperature may cause the decomposition or sintering of heat-sensitive pollutants, further reducing the adsorption performance of the activated carbon. This mismatch between thermal state and temperature control not only affects the single desorption effect, but also causes the continuous decay of the activated carbon adsorption capacity due to the accumulation of residual pollutants, ultimately resulting in a decrease in the overall treatment efficiency of the system and an increase in the operating cost; therefore, how to realize the bed heat accumulation compensation in the critical adsorption capacity update of activated carbon has become a difficult problem in the industry. SUMMARY

[0004] The present application provides an activated carbon adsorption and desorption system and method, which can realize bed heat accumulation compensation in the critical adsorption capacity update of activated carbon.

[0005] In a first aspect, the present application provides an activated carbon adsorption and desorption cycle regulation method, which comprises:

[0006] Monitoring the inlet pollutant concentration and outlet pollutant concentration of the polluted wastewater during the adsorption link, and determining the current adsorption capacity of the activated carbon adsorbent in the adsorption link based on the wastewater flow in the adsorption link, the concentration difference between the inlet pollutant concentration and the outlet pollutant concentration, and the mass of the activated carbon adsorbent.

[0007] extract a temperature fluctuation feature of the adsorption bed in the adsorption link when the current adsorption capacity is higher than the critical adsorption capacity of the activated carbon adsorbent, start the segmented desorption of the activated carbon adsorbent, perform bed heat storage compensation on a standard temperature in the desorption link through the temperature fluctuation feature and an ambient temperature of the adsorption bed, and obtain a heat storage compensation temperature of each desorption stage in the desorption link;

[0008] obtain a desorption duration of each desorption stage in the desorption link, perform stage desorption on the activated carbon adsorbent based on the desorption duration and all the heat storage compensation temperatures, collect pollutant concentration information of a stage desorption outlet in the stage desorption, and extract a desorption residual amount of the pollutant in the activated carbon adsorbent from the pollutant concentration information;

[0009] determine an effective desorption rate of the activated carbon adsorbent through the desorption residual amount and the current adsorption capacity, and perform cycle updating on the critical adsorption capacity of the activated carbon adsorbent in the next cycle based on the effective desorption rate.

[0010] In some embodiments, determining the current adsorption capacity of the activated carbon adsorbent in the adsorption link based on the concentration difference between the inlet pollutant concentration and the outlet pollutant concentration in the adsorption link and the mass of the activated carbon adsorbent specifically includes:

[0011] determining the concentration difference between the inlet pollutant concentration and the outlet pollutant concentration;

[0012] obtaining the wastewater flow in the adsorption link and the mass of the activated carbon adsorbent;

[0013] determining the current adsorption capacity of the activated carbon adsorbent in the adsorption link through the concentration difference, the wastewater flow, and the mass of the activated carbon adsorbent.

[0014] In some embodiments, extracting the temperature fluctuation feature of the adsorption bed in the adsorption link specifically includes:

[0015] collecting temperature information of different positions of the adsorption bed in the adsorption link;

[0016] extracting temperature fluctuation amplitudes of the different positions of the adsorption bed from the temperature information;

[0017] determining the temperature fluctuation feature of the adsorption bed in the adsorption link through all the temperature fluctuation amplitudes.

[0018] In some embodiments, performing bed heat storage compensation on a standard temperature in the desorption link through the temperature fluctuation feature and an ambient temperature of the adsorption bed to obtain a heat storage compensation temperature of each desorption stage in the desorption link specifically includes:

[0019] for each desorption stage in the desorption link, obtaining a standard temperature of the desorption stage;

[0020] evaluating the heat storage effect of the temperature fluctuation feature and the ambient temperature of the adsorption bed on the desorption stage, to obtain a heat storage compensation value of the desorption temperature in the desorption stage;

[0021] determining a heat storage compensation temperature of the desorption stage according to the heat storage compensation value and the standard temperature, to obtain the heat storage compensation temperature of each desorption stage in the desorption link.

[0022] In some embodiments, extracting the desorption residual amount of the pollutants in the activated carbon adsorbent from the pollutant concentration information specifically includes:

[0023] determining the desorption amount of the activated carbon adsorbent through the pollutant concentration information;

[0024] obtaining the initial mass of the activated carbon adsorbent;

[0025] determining the desorption residual amount of the pollutants in the activated carbon adsorbent according to the initial mass and the desorption amount.

[0026] In some embodiments, determining the effective desorption rate of the activated carbon adsorbent through the desorption residual amount and the current adsorption capacity specifically includes:

[0027] obtaining an environmental interference factor of the activated carbon adsorbent in the current desorption stage;

[0028] determining the effective desorption amount of the activated carbon adsorbent through the environmental interference factor and the desorption residual amount;

[0029] determining the effective desorption rate of the activated carbon adsorbent according to the effective desorption amount and the current adsorption capacity.

[0030] In some embodiments, cyclically updating the critical adsorption capacity of the activated carbon adsorbent in the next cycle based on the effective desorption rate specifically includes:

[0031] obtaining the critical adsorption capacity of the activated carbon adsorbent and an update threshold value;

[0032] when the effective desorption rate is lower than the update threshold value, updating the critical adsorption capacity through the efficiency difference between the effective desorption rate and the update threshold value, to complete the update of the critical adsorption capacity of the activated carbon adsorbent in the next cycle.

[0033] In a second aspect, the present application provides an activated carbon adsorption and desorption system, comprising a cycle adjustment unit, wherein the cycle adjustment unit comprises:

[0034] The monitoring module is configured to monitor the inlet pollutant concentration and the outlet pollutant concentration of the contaminated wastewater in the adsorption link, and determine the current adsorption capacity of the activated carbon adsorbent in the adsorption link based on the wastewater flow in the adsorption link, the concentration difference between the inlet pollutant concentration and the outlet pollutant concentration, and the mass of the activated carbon adsorbent;

[0035] The processing module is configured to extract the temperature fluctuation feature of the adsorption bed in the adsorption link when the current adsorption capacity is higher than the critical adsorption capacity of the activated carbon adsorbent, start the segmented desorption of the activated carbon adsorbent, perform bed heat storage compensation on the standard temperature in the desorption link by using the temperature fluctuation feature and the ambient temperature of the adsorption bed, and obtain the heat storage compensation temperature of each desorption stage in the desorption link.

[0036] The processing module is further configured to obtain the desorption duration of each desorption stage in the desorption link, perform stage desorption on the activated carbon adsorbent based on the desorption duration and all the heat storage compensation temperatures, collect the pollutant concentration information of the stage desorption outlet in the stage desorption, and extract the desorption residual amount of the pollutant in the activated carbon adsorbent from the pollutant concentration information.

[0037] The execution module is configured to determine the effective desorption rate of the activated carbon adsorbent by using the desorption residual amount and the current adsorption capacity, and perform cycle update on the critical adsorption capacity of the activated carbon adsorbent in the next cycle based on the effective desorption rate.

[0038] In a third aspect, the present application provides a computer device, which comprises a memory and a processor, the memory is configured to store a computer program, and the processor is configured to call and run the computer program from the memory, so that the computer device executes the activated carbon adsorption and desorption cycle adjustment method described above.

[0039] In a fourth aspect, the present application provides a computer readable storage medium, which stores instructions or codes, when the instructions or codes are run on a computer, the computer executes the activated carbon adsorption and desorption cycle adjustment method described above.

[0040] The technical scheme provided by the embodiments of the present application has the following beneficial effects:

[0041] The application provides an activated carbon adsorption and desorption system and method. In the adsorption link, the inlet pollutant concentration and the outlet pollutant concentration of the polluted wastewater are monitored, the current adsorption capacity of the activated carbon adsorbent in the adsorption link is determined based on the concentration difference between the wastewater flow, the inlet pollutant concentration and the outlet pollutant concentration in the adsorption link and the mass of the activated carbon adsorbent; when the current adsorption capacity is higher than the critical adsorption capacity of the activated carbon adsorbent, the temperature fluctuation characteristics of the adsorption bed layer in the adsorption link are extracted, the segmented desorption of the activated carbon adsorbent is started, the bed layer heat storage compensation of the standard temperature in the desorption link is carried out through the temperature fluctuation characteristics and the environmental temperature of the adsorption bed layer, the heat storage compensation temperatures of each desorption stage in the desorption link are obtained, the desorption time of each desorption stage in the desorption link is obtained, the stage desorption of the activated carbon adsorbent is carried out based on each desorption time and all heat storage compensation temperatures, the pollutant concentration information of the stage desorption outlet is collected in the stage desorption, the desorption residual amount of the pollutants in the activated carbon adsorbent is extracted from the pollutant concentration information, the effective desorption rate of the activated carbon adsorbent is determined through the desorption residual amount and the current adsorption capacity, and the critical adsorption capacity of the activated carbon adsorbent in the next cycle is updated cyclically based on the effective desorption rate.

[0042] It can be seen that, in the present application, the effective desorption rate of the activated carbon adsorbent is determined by the desorption residual amount and the current adsorption capacity, and the critical adsorption amount of the activated carbon adsorbent in the next cycle is updated based on the effective desorption rate. First, the heat storage compensation temperature is determined to obtain accurate desorption temperature regulation parameters, so as to realize dynamic heat balance optimization of the activated carbon bed. In the adsorption link, due to the heat release caused by the adsorption of pollutants and the influence of environmental factors, a non-uniform temperature field distribution is formed in the activated carbon bed. By extracting the temperature fluctuation characteristics of the adsorption bed and combining the environmental temperature data, the system can quantify the influence of bed heat storage on the desorption process, so that the set temperature of each desorption stage is accurately matched with the actual heat state of the bed. The energy waste problem caused by traditional fixed temperature desorption is overcome, and the best desorption temperature is achieved in each region of the bed. Therefore, the use of adsorption waste heat can significantly reduce the external energy input of the desorption process, thereby eliminating the phenomenon of incomplete desorption in local bed, and protecting the pore structure of activated carbon through accurate temperature control, prolonging the service life of activated carbon. Then, the desorption residual amount is determined to obtain a quantitative index of the regeneration effect of activated carbon, so as to establish a closed-loop control logic of critical adsorption amount updating, so as to objectively evaluate the effectiveness of this desorption regeneration. The desorption residual amount as an evaluation process variable reveals the balance state between adsorption and desorption. Combined with the current adsorption capacity, the performance degradation trend of activated carbon can be judged. Based on the comparison between the effective desorption rate and the preset threshold, the system can intelligently adjust the critical adsorption amount of the next cycle. If the desorption is not complete, the critical value is reduced to avoid premature saturation. If the desorption is sufficient, the critical value is appropriately increased to extend the adsorption period. The feedback mechanism centered on the desorption residual amount makes the critical adsorption amount no longer a static parameter, but a process variable that evolves dynamically with the actual state of activated carbon. Finally, the dual optimization of system processing efficiency and operation economy is realized. In summary, based on the above scheme, the bed heat storage compensation in the activated carbon critical adsorption amount updating can be realized. BRIEF DESCRIPTION OF DRAWINGS

[0043] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor.

[0044] Figure 1 is an exemplary flowchart of the activated carbon adsorption and desorption cycle regulation method according to some embodiments of the present application;

[0045] Figure 2 is a working principle diagram of activated carbon adsorption and desorption according to some embodiments of the present application;

[0046] Figure 3is a flowchart of determining the effective desorption rate according to some embodiments of the present application;

[0047] Figure 4 is a structural diagram of a circulating conditioning unit according to some embodiments of the present application;

[0048] Figure 5 is a structural diagram of a computer device for implementing the activated carbon adsorption and desorption circulating conditioning method according to some embodiments of the present application. DETAILED DESCRIPTION

[0049] In order to better understand the technical solutions of the present application, the technical solutions of the present application will be described in detail below in combination with the drawings in the specification and specific embodiments.

[0050] Reference Figure 1 The figure is an exemplary flowchart of an activated carbon adsorption and desorption circulating conditioning method according to some embodiments of the present application, which mainly includes the following steps:

[0051] In step 101, the inlet pollutant concentration and the outlet pollutant concentration of the contaminated wastewater are monitored in the adsorption link, and the current adsorption capacity of the activated carbon adsorbent in the adsorption link is determined based on the concentration difference between the wastewater flow, the inlet pollutant concentration and the outlet pollutant concentration in the adsorption link and the mass of the activated carbon adsorbent.

[0052] It should be noted that in the present application, the inlet pollutant concentration refers to the pollutant content of the contaminated wastewater to be treated before entering the activated carbon adsorption system, and the inlet pollutant concentration can reflect the initial pollution load of the wastewater; the outlet pollutant concentration refers to the pollutant content of the wastewater after being treated by the activated carbon adsorption, and the outlet pollutant concentration can be used to evaluate the adsorption effect and the real-time adsorption state of the activated carbon; wherein the inlet pollutant concentration and the outlet pollutant concentration are expressed in mass concentration, and the unit is mg / L.

[0053] When specifically implemented, before the wastewater enters the adsorption system, an online water quality analyzer (for example, a ultraviolet-visible spectrophotometer) is installed to directly determine the concentration of the target pollutant in the wastewater as the inlet pollutant concentration; a detection point is set downstream of the adsorption bed layer, and the same analyzer as the inlet is used to ensure data comparability, so that the collected pollutant concentration at the detection point is taken as the outlet pollutant concentration.

[0054] In some embodiments, reference is made to Figure 2The figure is a working principle diagram of activated carbon adsorption and desorption shown in some embodiments of the present application, which shows the working principle of a typical activated carbon adsorption and desorption system. The system contains two adsorption beds (adsorption bed A and adsorption bed B), which alternately perform adsorption and desorption operations. The exhaust gas generated by the pollution source is first introduced into the adsorption bed A by the main fan, and the organic pollutants are adsorbed by the activated carbon here, and the purified gas is then discharged into the atmosphere.

[0055] When the activated carbon in the adsorption bed A reaches the saturation state, the system switches to the adsorption bed B for adsorption, while the adsorption bed A enters the desorption stage. The desorption process introduces fresh air through the dry air fan and uses the heat provided by the heat exchanger to heat the saturated activated carbon, so that the adsorbed organic pollutants are released from the activated carbon. The released concentrated organic exhaust gas is then guided to the catalytic oxidation system CO for further treatment, and finally converted into harmless carbon dioxide and water vapor, completing the entire purification process. At the same time, the system is also provided with a waste heat utilization device, which can recover the heat generated in the desorption process, improving energy utilization efficiency.

[0056] In some embodiments, determining the current adsorption capacity of the activated carbon adsorbent in the adsorption link based on the concentration difference between the inlet pollutant concentration and the outlet pollutant concentration in the adsorption link, the wastewater flow in the adsorption link, and the mass of the activated carbon adsorbent can be achieved by the following steps:

[0057] Determine the concentration difference between the inlet pollutant concentration and the outlet pollutant concentration;

[0058] Obtain the wastewater flow in the adsorption link and the mass of the activated carbon adsorbent;

[0059] Determine the current adsorption capacity of the activated carbon adsorbent in the adsorption link by the concentration difference, the wastewater flow, and the mass of the activated carbon adsorbent.

[0060] It should be noted that in the present application, the current adsorption capacity refers to the amount of pollutants adsorbed by unit mass of activated carbon at a certain time, with the unit of mg / g; the concentration difference is the concentration difference reflecting the removal effect of activated carbon on pollutants; the wastewater flow represents the total wastewater through the adsorption system; and the mass of the activated carbon adsorbent refers to the total weight of the activated carbon loaded in the adsorption system, with the unit of g.

[0061] In a specific implementation, first, the concentration difference between the inlet pollutant concentration and the outlet pollutant concentration can be determined by subtracting the inlet pollutant concentration from the outlet pollutant concentration; then, the wastewater flow in the adsorption link and the mass of the activated carbon adsorbent can be obtained by monitoring the wastewater flow in the adsorption link using an ultrasonic flow meter and obtaining the mass of the activated carbon adsorbent from the initial loading record of the adsorption system, and if the system is a fluidized bed, the activated carbon needs to be supplemented regularly, and the dynamic update is performed through a mass sensor or a loading volume-density conversion; finally, the current adsorption capacity of the activated carbon adsorbent in the adsorption link can be determined by multiplying the concentration difference by the wastewater flow based on the principle of mass conservation, obtaining the total amount of pollutants adsorbed by the activated carbon per unit time, and dividing the total amount of pollutants by the mass of the activated carbon to obtain the current adsorption capacity of the activated carbon per unit mass.

[0062] In step 102, when the current adsorption capacity is higher than the critical adsorption capacity of the activated carbon adsorbent, the temperature fluctuation characteristics of the adsorption bed in the adsorption link are extracted, the segmented desorption of the activated carbon adsorbent is started, and the bed heat storage compensation temperature of each desorption stage in the desorption link is obtained by compensating the standard temperature in the desorption link based on the temperature fluctuation characteristics and the environmental temperature of the adsorption bed.

[0063] It should be noted that in this application, the critical adsorption capacity refers to the pollutant load of the activated carbon adsorbent when it reaches the limit of effective adsorption capacity under specified conditions. The critical adsorption capacity can be determined by experiment or historical data statistics and stored in the control console of the activated carbon adsorption system. The critical adsorption capacity can reflect the threshold value of the activated carbon to maintain ideal adsorption efficiency, and exceeding the critical adsorption capacity will result in a significant decrease in adsorption performance. When the current adsorption capacity exceeds the critical adsorption capacity of the activated carbon adsorbent, it indicates that the adsorption capacity of the activated carbon adsorbent is close to saturation, and the effective adsorption of its pore structure to pollutants tends to be limited. Continuing to run will result in a significant decrease in adsorption efficiency and a risk of pollutant breakthrough. At this time, the activated carbon adsorbent needs to be started for regeneration program, and the adsorption performance of the activated carbon is restored through the desorption link. At the same time, this state also reflects the actual treatment capacity of the activated carbon under the current working condition, providing an important basis for process optimization and material replacement. The determination of the critical adsorption capacity is a key control index for maintaining the continuous and stable operation of the adsorption system.

[0064] In some embodiments, the temperature fluctuation characteristics of the adsorption bed in the adsorption link can be extracted by the following steps:

[0065] Collecting temperature information of the adsorption bed at different positions in the adsorption link;

[0066] extracting temperature fluctuation amplitudes of the adsorption bed at different positions from the temperature information;

[0067] determining the temperature fluctuation characteristics of the adsorption bed in the adsorption link through all the temperature fluctuation amplitudes.

[0068] It should be noted that in this application, the temperature fluctuation characteristics refer to the temperature change rule of the adsorption bed in the adsorption process; the temperature information refers to the temperature value reflecting the local thermal effect in the adsorption process; and the temperature fluctuation amplitude represents the degree of temperature change at different positions of the adsorption bed.

[0069] In a specific implementation, first, the temperature information of the adsorption bed at different positions in the adsorption link can be collected in the following manner, that is, a plurality of high-precision temperature sensors (such as PT100 platinum resistance or thermocouple) are arranged at key positions (such as the gas inlet end, the gas outlet end, and the middle part) of the adsorption bed to record the temperature information at each position in real time at a fixed sampling frequency (default 1 time / second). In other embodiments, the temperature sensors can also be distributed according to the needs, which is not limited here, as long as the sensors are uniformly distributed to ensure coverage of the cross section and depth of the bed, and the data is transmitted to the central monitoring system through wired or wireless transmission, and signal anti-interference processing is performed; then, the temperature fluctuation amplitudes of the adsorption bed at different positions can be extracted from the temperature information in the following manner, that is, for each position of the adsorption bed, the corresponding temperature information at the position is obtained, all maximum and minimum values in the temperature information are counted, and the difference between each maximum value and the adjacent minimum value is calculated as the temperature fluctuation value of the maximum value, so as to remove the maximum value and the minimum value in all temperature fluctuation values, and the mean value of the remaining temperature fluctuation values is calculated as the temperature fluctuation amplitude at the position. Through the above manner, the temperature fluctuation amplitudes at each position of the adsorption bed can be obtained, that is, the temperature fluctuation amplitudes at different positions of the adsorption bed can be obtained; finally, the temperature fluctuation characteristics of the adsorption bed in the adsorption link can be determined through all the temperature fluctuation amplitudes in the following manner, that is, the mean value of all the temperature fluctuation amplitudes is taken as the temperature fluctuation characteristics of the adsorption bed in the adsorption link.

[0070] In some embodiments, the heat storage compensation temperature of each desorption stage in the desorption link can be obtained by performing bed heat storage compensation on the standard temperature in the desorption link through the temperature fluctuation characteristics and the ambient temperature of the adsorption bed by using the following steps:

[0071] For each desorption stage in the desorption link, the standard temperature of the desorption stage is obtained;

[0072] The heat storage influence of the bed in the desorption stage is evaluated through the temperature fluctuation characteristics and the ambient temperature of the adsorption bed, and a heat storage compensation value of the desorption temperature in the desorption stage is obtained;

[0073] The heat storage compensation temperature of each desorption stage in the desorption link is obtained according to the heat storage compensation value and the standard temperature.

[0074] It should be noted that in the present application, the heat storage compensation temperature represents the actual control temperature of the desorption stage; the standard temperature refers to the pre-set target temperature of the desorption stage; and the heat storage compensation value refers to the adjustment amount required for the standard temperature to offset the influence of bed heat storage, which refers to the additional heat accumulated in the activated carbon bed due to the exothermic reaction in the adsorption stage.

[0075] In a specific implementation, firstly, for each desorption stage in the desorption link, the standard temperature of the desorption stage can be obtained by the following method, that is, according to the activated carbon regeneration process requirements, the basic temperature curve of each desorption stage is set for different pollutants, for example, the preheating stage is 80℃, the main desorption stage is 200℃, and the cooling stage is 50℃, and the parameters are stored in the control system database and can be automatically called when the activated carbon type is switched. For each desorption stage in the desorption link, the standard temperature of the desorption stage is obtained from the control system database of the activated carbon adsorbent; then, the influence of bed heat storage on the desorption temperature in the desorption stage is evaluated by the temperature fluctuation characteristics and the environment temperature of the adsorption bed, and the heat storage compensation value of the desorption temperature in the desorption stage can be obtained by the following method, that is, the environment temperature of the adsorption bed at the end of adsorption is measured by using a temperature sensor, so that the sum of the environment temperature and the temperature fluctuation characteristics is taken as the bed heat storage temperature of the desorption stage, the influence factor of the bed heat storage on the desorption temperature of the activated carbon adsorbent is calculated from the control system database of the activated carbon adsorbent, and the product of the influence factor and the bed heat storage temperature is taken as the heat storage compensation value of the desorption temperature in the desorption stage; finally, the heat storage compensation temperature of the desorption stage is determined according to the heat storage compensation value and the standard temperature, and the heat storage compensation temperature of each desorption stage in the desorption link is obtained by the following method, that is, the sum of the heat storage compensation value and the standard temperature is taken as the heat storage compensation temperature of the desorption stage, and the heat storage compensation temperature of each desorption stage in the desorption link can be obtained by the above method.

[0076] In step 103, the desorption time length of each desorption stage in the desorption link is obtained, and the activated carbon adsorbent is subjected to stage desorption based on each desorption time length and all heat storage compensation temperatures. The pollutant concentration information of the stage desorption outlet is collected in the stage desorption, and the desorption residual amount of the pollutant in the activated carbon adsorbent is extracted from the pollutant concentration information.

[0077] It should be noted that in the present application, the desorption time length refers to the time duration of each desorption stage; and the pollutant concentration information refers to the real-time concentration data of the pollutant discharged from the bed outlet during the desorption process, which can reflect the progress and effect of the desorption.

[0078] In a specific implementation, first, the desorption duration of each desorption stage in the desorption link can be obtained in the following manner: obtaining the desorption duration of each desorption stage in the desorption link from a process database of the activated carbon adsorbent; then, the stage desorption of the activated carbon adsorbent based on the desorption duration and all heat storage compensation temperatures can be implemented in the following manner: in each desorption stage in the desorption link, the heat storage compensation temperature of the desorption stage is used as the desorption temperature of the desorption link, and the corresponding desorption duration is continued, so that the stage desorption of the activated carbon adsorbent in the desorption stage is completed, and the stage desorption of the activated carbon adsorbent in each desorption stage in the desorption link is completed through the above manner; finally, the pollutant concentration information of the stage desorption outlet in the stage desorption can be collected in the following manner: using an online water quality analyzer (for example, an ultraviolet-visible spectrophotometer) to collect the pollutant concentration of the stage desorption outlet every fixed time interval (1 second by default) in the stage desorption, so that the set of all pollutant concentrations is used as the pollutant concentration information of the stage desorption outlet.

[0079] In some embodiments, extracting the desorption residual amount of the pollutant in the activated carbon adsorbent from the pollutant concentration information can be implemented in the following steps:

[0080] determining the desorption amount of the activated carbon adsorbent from the pollutant concentration information;

[0081] obtaining the initial mass of the activated carbon adsorbent;

[0082] determining the desorption residual amount of the pollutant in the activated carbon adsorbent according to the initial mass and the desorption amount.

[0083] It should be noted that in this application, the desorption residual amount represents the proportion of the pollutant remaining in the activated carbon pores after the desorption is completed; the desorption amount refers to the total amount of the pollutant desorbed and discharged from the surface of the activated carbon in the desorption stage, and the desorption amount can reflect the regeneration degree of the activated carbon; the initial mass refers to the total mass of the activated carbon adsorbent before desorption, which includes the mass of the activated carbon itself and the mass of the adsorbed pollutant.

[0084] In a specific implementation, first, determining the desorption amount of the activated carbon adsorbent from the pollutant concentration information can be implemented in the following manner: calculating the definite integral of all pollutant concentrations in the pollutant concentration information as the desorption amount of the activated carbon adsorbent; then, obtaining the initial mass of the activated carbon adsorbent can be implemented in the following manner: before desorption, the total mass of the adsorption bed is measured by an embedded weighing sensor, and the initial mass of the activated carbon adsorbent is obtained by subtracting the self-weight of the bed body from the total mass of the adsorption bed; finally, determining the desorption residual amount of the pollutant in the activated carbon adsorbent according to the initial mass and the desorption amount can be implemented in the following manner: the ratio of the desorption amount to the initial mass is used as the desorption residual amount of the pollutant in the activated carbon adsorbent.

[0085] In step 104, an effective desorption rate of the activated carbon adsorbent is determined based on the desorption residual amount and the current adsorption capacity, and a critical adsorption amount of the activated carbon adsorbent in the next cycle is updated based on the effective desorption rate.

[0086] In some embodiments, the effective desorption rate of the activated carbon adsorbent is determined based on the desorption residual amount and the current adsorption capacity, and the critical adsorption amount of the activated carbon adsorbent in the next cycle is updated based on the effective desorption rate. Figure 3 The figure is a flowchart for determining the effective desorption rate in some embodiments of the present application, and the effective desorption rate in the present embodiment can be determined by the following steps:

[0087] In step 1041, an environmental interference factor of the activated carbon adsorbent in the current desorption stage is obtained.

[0088] In step 1042, an effective desorption amount of the activated carbon adsorbent is determined based on the environmental interference factor and the desorption residual amount.

[0089] In step 1043, an effective desorption rate of the activated carbon adsorbent is determined based on the effective desorption amount and the current adsorption capacity.

[0090] It should be noted that in the present application, the effective desorption rate represents the degree of complete regeneration of the activated carbon adsorbent after desorption; the environmental interference factor refers to the influence degree of external environmental factors on the accuracy of pollutant measurement during desorption; and the effective desorption amount is the desorption amount reflecting the real regeneration effect.

[0091] In a specific implementation, first, the environmental interference factor of the activated carbon adsorbent in the current desorption stage can be obtained by the following method, that is, obtaining the environmental parameters in the current desorption stage, and obtaining the interference factor of the environmental parameters on the desorption amount of the activated carbon adsorbent from the process database of the activated carbon adsorbent as the environmental interference factor of the activated carbon adsorbent in the current desorption stage; then, the effective desorption amount of the activated carbon adsorbent can be determined by the following method based on the environmental interference factor and the desorption residual amount, that is, multiplying the environmental interference factor and the desorption residual amount to obtain the effective desorption amount of the activated carbon adsorbent; finally, the effective desorption rate of the activated carbon adsorbent can be determined by the following method based on the effective desorption amount and the current adsorption capacity, that is, taking the ratio of the effective desorption amount and the current adsorption capacity as the effective desorption rate of the activated carbon adsorbent.

[0092] In some embodiments, the critical adsorption amount of the activated carbon adsorbent in the next cycle can be updated based on the effective desorption rate by the following steps:

[0093] The critical adsorption amount of the activated carbon adsorbent and an update threshold are obtained.

[0094] When the effective desorption rate is lower than the update threshold, the critical adsorption capacity is updated by the efficiency difference between the effective desorption rate and the update threshold, and the updating of the critical adsorption capacity of the activated carbon adsorbent in the next cycle is completed.

[0095] In a specific implementation, first, the critical adsorption capacity of the activated carbon adsorbent and the update threshold can be obtained from the control console of the activated carbon adsorption system, and the update threshold is used to determine whether the critical adsorption capacity needs to be adjusted; then, when the effective desorption rate is lower than the update threshold, the critical adsorption capacity is updated by the efficiency difference between the effective desorption rate and the update threshold, and the updating of the critical adsorption capacity of the activated carbon adsorbent in the next cycle is completed by the following method: when the effective desorption rate is greater than the update threshold, the current critical adsorption capacity is maintained; when the effective desorption rate is lower than the update threshold, the difference between the update threshold and the effective desorption rate is calculated as the efficiency difference, the adjustment ratio corresponding to the efficiency difference in the update mapping table of the activated carbon adsorption system control console is obtained, and the product of the critical adsorption capacity and the adjustment ratio is taken as the update value of the critical adsorption capacity. The update value is taken as the critical adsorption capacity of the activated carbon adsorbent in the next cycle, and the updating of the critical adsorption capacity of the activated carbon adsorbent in the next cycle is completed by the above method.

[0096] In addition, another aspect of the present application provides an activated carbon adsorption and desorption system, which includes a cycle adjustment unit, and the cycle adjustment unit includes a monitoring module, a processing module, and an execution module. Figure 4 The figure is a structural schematic diagram of the cycle adjustment unit according to some embodiments of the present application, which includes a monitoring module 201, a processing module 202, and an execution module 203, which are described as follows:

[0097] The monitoring module 201 is mainly used to monitor the inlet pollutant concentration and the outlet pollutant concentration of the polluted wastewater in the adsorption link, and to determine the current adsorption capacity of the activated carbon adsorbent in the adsorption link based on the concentration difference between the wastewater flow, the inlet pollutant concentration, and the outlet pollutant concentration in the adsorption link and the mass of the activated carbon adsorbent;

[0098] The processing module 202 is used to extract the temperature fluctuation characteristics of the adsorption bed in the adsorption link when the current adsorption capacity is higher than the critical adsorption capacity of the activated carbon adsorbent, to start the segmented desorption of the activated carbon adsorbent, to perform bed heat storage compensation on the standard temperature in the desorption link by the temperature fluctuation characteristics and the environment temperature of the adsorption bed, and to obtain the heat storage compensation temperature of each desorption stage in the desorption link.

[0099] It should be noted that the processing module 202 is also used to obtain the desorption time length of each desorption stage in the desorption link, and perform stage desorption on the activated carbon adsorbent based on the desorption time length and all the heat storage compensation temperatures, collect the pollutant concentration information of the stage desorption outlet in the stage desorption, and extract the desorption residual amount of the pollutant in the activated carbon adsorbent from the pollutant concentration information.

[0100] The execution module 203 is mainly used to determine the effective desorption rate of the activated carbon adsorbent by the desorption residual amount and the current adsorption capacity, and perform cycle updating on the critical adsorption amount of the activated carbon adsorbent in the next cycle based on the effective desorption rate.

[0101] The above describes the examples of the activated carbon adsorption and desorption system and method provided by the embodiments of the present application in detail. It can be understood that the corresponding device contains the hardware structure and / or software module corresponding to the execution of each function in order to realize the above functions. Those skilled in the art should easily realize that the units and algorithm steps of each example described in combination with the embodiments disclosed in the present application can be realized in the form of hardware or a combination of hardware and computer software. Whether a certain function is executed in the form of hardware or computer software driving hardware depends on the specific application and design constraints of the technical solution. Professional technicians can use different methods to realize the described functions for each specific application, but such implementation should not be considered beyond the scope of the present application.

[0102] In some embodiments, the present application also provides a computer device, which comprises a memory and a processor, the memory is used to store a computer program, and the processor is used to call and run the computer program from the memory, so that the computer device executes the above-mentioned activated carbon adsorption and desorption cycle adjustment method.

[0103] In some embodiments, with reference to Figure 5 The dashed line in the figure indicates that the unit or the module is optional, and the figure is a structural schematic diagram of a computer device for implementing the activated carbon adsorption and desorption cycle adjustment method according to the embodiments of the present application. The activated carbon adsorption and desorption cycle adjustment method described in the above embodiments can be implemented by the computer device shown in the figure, which comprises at least one processor 301, a memory 302 and at least one communication unit 305, and the computer device can be a terminal device or a server or a chip. Figure 5

[0104] ​The processor 301 can be a general processor or a special-purpose processor. For example, the processor 301 can be a central processing unit (CPU), which can be used to control a computer device, execute a software program, and process data of the software program. The computer device can further include a communication unit 305 to implement input (reception) and output (transmission) of signals.

[0105] For example, the computer device can be a chip, and the communication unit 305 can be an input and / or output circuit of the chip, or the communication unit 305 can be a communication interface of the chip, and the chip can be a component of a terminal device or a network device or other device.

[0106] For another example, the computer device can be a terminal device or a server, and the communication unit 305 can be a transceiver of the terminal device or the server, or the communication unit 305 can be a transceiver circuit of the terminal device or the server.

[0107] The computer device can include one or more memories 302, which store a program 304 that can be executed by the processor 301 to generate instructions 303, so that the processor 301 performs the method described in the above method embodiments according to the instructions 303. Optionally, the memory 302 can further store data (such as a target audit model). Optionally, the processor 301 can further read the data stored in the memory 302, and the data can be stored in the same storage address as the program 304, or the data can be stored in a different storage address from the program 304.

[0108] The processor 301 and the memory 302 can be separately arranged or integrated together, for example, integrated on a system on chip (SOC) of a terminal device.

[0109] It should be understood that each step of the above method embodiments can be completed by a logic circuit in the form of hardware or instructions in the form of software in the processor 301. The processor 301 can be a CPU, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA), or other programmable logic devices, for example, discrete gates or transistor logic devices, or discrete hardware components.

[0110] Those skilled in the art will appreciate that embodiments of the present application can be devised for a method, a system, or a computer program product. Accordingly, the present application can take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application can take the form of a computer program product on one or more computer readable storage media (including, but not limited to, disk storage, CD-ROMs, optical storage devices, etc.) embodying computer readable program code.

[0111] For example, in some embodiments, the present application also provides a computer readable storage medium having instructions or codes stored therein, which, when executed on a computer, cause the computer to perform the above-mentioned activated carbon adsorption / desorption cycle regulation method.

[0112] While the preferred embodiments of the application have been described, additional variations and modifications can be made to the embodiments by those skilled in the art once they learn of the basic inventive concepts. Therefore, the appended claims are intended to encompass within their scope all such variations and modifications as are included within the scope of the application.

[0113] Obviously, numerous modifications and variations of the present application are possible in light of the above teachings. It is therefore to be understood that within the scope of the appended claims and their equivalents, the application can be practiced otherwise than as specifically described.

Claims

1. A method for regulating the adsorption-desorption cycle of activated carbon, characterized in that, The method includes the following steps: In the adsorption process, the inlet and outlet pollutant concentrations of the polluted wastewater are monitored. Based on the wastewater flow rate in the adsorption process, the concentration difference between the inlet and outlet pollutant concentrations, and the mass of the activated carbon adsorbent, the current adsorption capacity of the activated carbon adsorbent in the adsorption process is determined. When the current adsorption capacity is higher than the critical adsorption capacity of the activated carbon adsorbent, the temperature fluctuation characteristics of the adsorption bed in the adsorption process are extracted, the segmented desorption of the activated carbon adsorbent is initiated, and the standard temperature in the desorption process is compensated for by the temperature fluctuation characteristics and the ambient temperature of the adsorption bed to obtain the heat compensation temperature of each desorption stage in the desorption process. The desorption time of each desorption stage in the desorption process is obtained. Based on each desorption time and all heat storage compensation temperatures, the activated carbon adsorbent is desorbed in stages. During the stage desorption, the pollutant concentration information at the stage desorption outlet is collected. The desorption residue of pollutants in the activated carbon adsorbent is extracted from the pollutant concentration information. The effective desorption rate of the activated carbon adsorbent is determined by the desorption residue and the current adsorption capacity, and the critical adsorption capacity of the activated carbon adsorbent in the next cycle is updated based on the effective desorption rate. Specifically, the temperature fluctuation characteristics of the adsorption bed in the extraction and adsorption process include: Collect temperature information at different locations in the adsorption bed during the adsorption process; Extract the temperature fluctuation amplitude at different locations in the adsorption bed from various temperature data; The temperature fluctuation characteristics of the adsorption bed in the adsorption process are determined by measuring all temperature fluctuation amplitudes. Specifically, the cyclical updating of the critical adsorption capacity of the activated carbon adsorbent in the next cycle based on the effective desorption rate includes: To obtain the critical adsorption capacity and update threshold of activated carbon adsorbent; When the effective desorption rate is lower than the update threshold, the critical adsorption amount is updated based on the efficiency difference between the effective desorption rate and the update threshold, thereby completing the update of the critical adsorption amount of the activated carbon adsorbent in the next cycle.

2. The method as described in claim 1, characterized in that, The current adsorption capacity of the activated carbon adsorbent in the adsorption process is determined based on the wastewater flow rate, the concentration difference between the inlet and outlet pollutants, and the mass of the activated carbon adsorbent. Specifically, this includes: Determine the concentration difference between the inlet pollutant concentration and the outlet pollutant concentration; To obtain the wastewater flow rate and the mass of activated carbon adsorbent in the adsorption process; The current adsorption capacity of the activated carbon adsorbent in the adsorption process is determined by the concentration difference, the wastewater flow rate, and the mass of the activated carbon adsorbent.

3. The method as described in claim 1, characterized in that, By using the temperature fluctuation characteristics and the ambient temperature of the adsorption bed to compensate for the standard temperature in the desorption process, the heat storage compensation temperature for each desorption stage is obtained, specifically including: For each desorption stage in the desorption process, obtain the standard temperature of the desorption stage; The influence of the temperature fluctuation characteristics and the ambient temperature of the adsorption bed on the heat storage of the bed during the desorption stage is evaluated to obtain the heat storage compensation value of the desorption temperature during the desorption stage. The heat storage compensation temperature for the desorption stage is determined based on the heat storage compensation value and the standard temperature, thereby obtaining the heat storage compensation temperature for each desorption stage in the desorption process.

4. The method as described in claim 1, characterized in that, Extracting the desorption residue of pollutants from the activated carbon adsorbent from the pollutant concentration information specifically includes: The desorption amount of activated carbon adsorbent is determined by the pollutant concentration information. Obtain the initial mass of the activated carbon adsorbent; The residual amount of pollutants in the activated carbon adsorbent is determined based on the initial mass and the desorption amount.

5. The method as described in claim 1, characterized in that, Determining the effective desorption rate of activated carbon adsorbent by using the desorption residue and the current adsorption capacity specifically includes: To obtain environmental interference factors during the current stage of activated carbon adsorbent desorption; The effective desorption amount of activated carbon adsorbent is determined by the environmental interference factors and the desorption residue. The effective desorption rate of the activated carbon adsorbent is determined based on the effective desorption amount and the current adsorption capacity.

6. An activated carbon adsorption-desorption system, comprising a circulation adjustment unit, wherein the activated carbon adsorption-desorption circulation adjustment is performed using the method described in any one of claims 1 to 5, characterized in that, The cycle adjustment unit includes: The monitoring module is used to monitor the inlet and outlet pollutant concentrations of polluted wastewater in the adsorption stage, and to determine the current adsorption capacity of the activated carbon adsorbent in the adsorption stage based on the wastewater flow rate in the adsorption stage, the concentration difference between the inlet and outlet pollutant concentrations, and the mass of the activated carbon adsorbent. The processing module is used to extract the temperature fluctuation characteristics of the adsorption bed in the adsorption process when the current adsorption capacity is higher than the critical adsorption capacity of the activated carbon adsorbent, start the segmented desorption of the activated carbon adsorbent, and perform bed heat storage compensation on the standard temperature in the desorption process through the temperature fluctuation characteristics and the ambient temperature of the adsorption bed to obtain the heat storage compensation temperature of each desorption stage in the desorption process. The processing module is also used to obtain the desorption time of each desorption stage in the desorption process, perform staged desorption of the activated carbon adsorbent based on each desorption time and all heat storage compensation temperatures, collect pollutant concentration information at the stage desorption outlet during stage desorption, and extract the desorption residue of pollutants in the activated carbon adsorbent from the pollutant concentration information. The execution module is used to determine the effective desorption rate of the activated carbon adsorbent by means of the desorption residue and the current adsorption capacity, and to update the critical adsorption capacity of the activated carbon adsorbent in the next cycle based on the effective desorption rate.

7. A computer device, characterized in that, The computer device includes a memory and a processor. The memory is used to store computer programs, and the processor is used to call and run the computer programs from the memory, so that the computer device performs the activated carbon adsorption-desorption cycle regulation method according to any one of claims 1 to 5.

8. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores instructions or code that, when executed on a computer, cause the computer to implement the activated carbon adsorption-desorption cycle regulation method as described in any one of claims 1 to 5.

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