Tail gas absorption device and method for asphalt processing

Abstract

The invention discloses a tail gas absorption device and method for asphalt processing, and belongs to the technical field of tail gas treatment.The method comprises the steps that real-time working condition parameters of asphalt tail gas are obtained; obtaining target dynamic surface tension and target charge density based on the working condition parameters; based on the target value, the surfactant addition amount and the electrostatic ring working voltage are obtained; preparing spraying liquid, applying voltage, and measuring actual dynamic surface tension and actual charge density in real time; spraying the spraying liquid into an absorption tower for absorption, and obtaining theoretical absorption efficiency based on actual parameters; and comparing the theoretical absorption efficiency with the target absorption efficiency, if the theoretical absorption efficiency is smaller than the target value, adjusting the addition amount and / or the voltage and returning to the previous step, otherwise, maintaining the current parameter operation. Through cooperative regulation and control of dynamic surface tension and charge density and introduction of a closed-loop feedback mechanism, efficient and stable absorption of asphalt tail gas is achieved, and the problems that in the prior art, absorption efficiency fluctuation is large, and it is difficult to adapt to working condition changes are solved.

Description

Technical Field

[0001] This invention belongs to the field of exhaust gas treatment technology, and particularly relates to an exhaust gas absorption device and method for asphalt processing. Background Technology

[0002] Currently, spray absorption is commonly used to treat exhaust gas from asphalt processing. This method involves contacting the exhaust gas with a spray solution to remove pollutants through physical capture and dissolution.

[0003] In the prior art, for example, Chinese patent CN106474880A discloses an organic waste gas treatment system for modified asphalt production and an asphalt production section, which uses an absorption tower combined with cleaning oil for spray absorption, and the exhaust gas is condensed and then enters a combustion device for treatment. In addition, patent CN121288470A relates to a rubber asphalt production exhaust gas treatment device, which uses a filter screen for graded filtration supplemented by electrostatic cleaning; patent CN218834051U relates to an asphalt emulsifier exhaust gas adsorption device, which uses adsorption materials combined with cooling components to cool and filter the exhaust gas; and patent CN120114934A relates to an asphalt fume waste gas treatment system and its treatment method, which uses a dry circulating dust removal combined with regenerative combustion to treat asphalt fumes.

[0004] However, the aforementioned existing technologies all have the following drawbacks: First, the physical properties of the spray liquid (such as surface tension) are usually fixed and cannot be adjusted in real time according to the dynamic changes in exhaust gas conditions (particulate matter concentration, organic matter concentration, temperature, etc.), resulting in large fluctuations in absorption efficiency; second, no charge control is applied to the spray liquid, resulting in limited collection efficiency for submicron particles and organic droplets, making it difficult to achieve deep purification; third, there is a lack of a closed-loop feedback mechanism based on actual absorption effect, making it impossible to adaptively optimize operating parameters, resulting in high energy consumption and reagent consumption. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a tail gas absorption device and method for asphalt processing, which solves the aforementioned problems.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a method for absorbing exhaust gas from asphalt processing, comprising:

[0007] S1. Obtain real-time operating parameters of asphalt exhaust gas, including exhaust gas temperature, exhaust gas pressure, exhaust gas volumetric flow rate, particulate matter concentration and organic matter concentration in the exhaust gas.

[0008] S2. Based on the operating parameters, obtain the target dynamic surface tension and target charge density;

[0009] S3. Based on the target dynamic surface tension and target charge density, obtain the required amount of surfactant and the electrostatic ring working voltage;

[0010] S4. Based on the amount of surfactant added and the working voltage of the electrostatic ring, the spray liquid is prepared and a voltage is applied to measure the actual dynamic surface tension and actual charge density of the spray liquid in real time.

[0011] S5. The prepared spray liquid is sprayed into the absorption tower to contact and absorb the asphalt tail gas, and the theoretical absorption efficiency is obtained based on the actual dynamic surface tension and actual charge density.

[0012] S6. Compare the theoretical absorption efficiency with the set target absorption efficiency. If the theoretical absorption efficiency is less than the target absorption efficiency, adjust the amount of surfactant added and / or the working voltage of the electrostatic ring, and return to step S4; otherwise, maintain the current parameters.

[0013] Based on the above technical solutions, the present invention also provides the following optional technical solutions:

[0014] Further technical solution: In step S2:

[0015] The target dynamic surface tension is obtained using the following formula:

[0016]

[0017] in, Indicates the dynamic surface tension of the target. This represents the dynamic surface tension of the solvent at a reference temperature. This indicates the physical concentration of particulate matter in the exhaust gas. This indicates the reference value for particulate matter concentration. Indicates the exhaust gas temperature. Indicates the temperature reference value. This represents the influence coefficient of particulate matter concentration. This represents the particulate matter concentration index coefficient. This indicates the factors that affect temperature.

[0018] Further technical solution: In step S2, the target charge density is obtained using the following formula:

[0019]

[0020] in, Indicates the target charge density. This represents the reference value for the base charge density. This indicates the concentration of organic matter in the exhaust gas. This indicates a reference value for organic matter concentration. Indicates the exhaust gas volumetric flow rate. This represents a reference value for traffic flow. This represents the influence coefficient of organic matter concentration. This represents the organic matter concentration index coefficient. This represents the flow rate impact coefficient.

[0021] Further technical solution: In step S3:

[0022] First, the spray volumetric flow rate is obtained based on the set liquid-to-gas ratio and exhaust gas volumetric flow rate:

[0023]

[0024] in, Indicates the spray volumetric flow rate. This indicates the set liquid-to-gas ratio. Indicates the exhaust gas volumetric flow rate;

[0025] Secondly, the amount of surfactant added is determined based on the spray volumetric flow rate and the target dynamic surface tension.

[0026]

[0027] in, Indicates the amount of surfactant added. This represents the dynamic surface tension of the solvent at the current temperature. Indicates the dynamic surface tension of the target. The surfactant efficiency coefficient (unit: (mN / m)·h / kg) represents the amount of surfactant added per 1 kg / h increase in flow rate. The surface tension value that can be reduced (below) This indicates the volumetric flow rate of the spray liquid.

[0028] Further technical solution: In step S3, the electrostatic working voltage is obtained by the following formula:

[0029]

[0030] in, Indicates the operating voltage of the electrostatic ring. Indicates the target charge density. Indicates the volumetric flow rate of the spray liquid. It represents the electrostatic charging efficiency coefficient (unit: (μC / kg)·(m³ / h) / kV).

[0031] Further technical solution: In step S5, the theoretical absorption efficiency is obtained using the following formula:

[0032]

[0033] in, Indicates the theoretical absorption efficiency. This indicates the reference dynamic surface tension (taken from the dynamic surface tension of the solvent itself). This represents the actual dynamic surface tension. Represents the reference charge density. Represents the actual charge density, Indicates the volumetric flow rate of the spray liquid. Indicates exhaust gas flow rate. This represents the baseline coefficient for absorption efficiency. Indicates the surface tension index. Indicates the charge density index, This indicates the liquid-to-gas ratio index.

[0034] Further technical solution: In step S6, the method for adjusting the amount of surfactant added and / or the working voltage of the electrostatic ring is as follows:

[0035] The corrected value for surfactant addition amount is obtained based on theoretical absorption efficiency and target absorption efficiency:

[0036]

[0037] in, This indicates the correction value for the amount of surfactant added. Indicates the target absorption efficiency. Indicates the theoretical absorption efficiency. This indicates the adjustment coefficient for the proportion of addition (unit: kg / h).

[0038] The correction value for the operating voltage of the electrostatic loop is obtained based on the theoretical absorption efficiency and the target absorption efficiency.

[0039]

[0040] in, Correction value for the operating voltage of the electrostatic ring. Indicates the target absorption efficiency. Indicates the theoretical absorption efficiency. This represents the voltage proportional regulation coefficient (unit: kV).

[0041] The updated dosage and updated voltage are obtained based on the surfactant addition correction value and the electrostatic ring working voltage correction value:

[0042]

[0043]

[0044] in, Indicates the amount added in the update. Indicates updated voltage. Indicates the amount of surfactant added. This indicates the correction value for the amount of surfactant added. Indicates the operating voltage of the electrostatic ring. Correction value for the working voltage of the electrostatic ring.

[0045] Further technical solution: The solvent is water or washing oil.

[0046] A tail gas absorption device for asphalt processing adopts the above-mentioned tail gas absorption method for asphalt processing.

[0047] This invention provides a tail gas absorption device and method for asphalt processing, which has the following advantages compared with the prior art:

[0048] 1. This invention achieves dynamic matching between the physical properties of the spray liquid and the exhaust gas load by acquiring exhaust gas operating parameters in real time and calculating the target dynamic surface tension and target charge density based on these parameters. When the concentration of particulate matter in the exhaust gas increases, the target dynamic surface tension decreases accordingly, ensuring that the spray liquid can form finer droplets and increase the contact area; when the concentration of organic matter increases, the target charge density increases accordingly, enhancing the electrostatic capture capability of organic droplets. Compared with the existing technology that uses fixed-parameter spraying, this invention can adapt to changes in operating conditions, significantly improving the stability of absorption efficiency.

[0049] 2. This invention introduces a dual-parameter synergistic control mechanism of dynamic surface tension and charge density, and establishes a theoretical absorption efficiency model that includes surface tension ratio, charge density ratio, and liquid-to-gas ratio, thereby achieving a quantitative description of the absorption process. Low dynamic surface tension promotes atomization and wetting, while high charge density enhances electrostatic capture. The synergistic effect of these two factors makes it particularly suitable for the complex composition of asphalt exhaust gas, which contains both particulate matter and organic matter, with a particularly significant improvement in the capture efficiency of submicron-sized particles.

[0050] 3. This invention adopts a closed-loop feedback control strategy, which compares the theoretical absorption efficiency with the target absorption efficiency, and adjusts the amount of surfactant added and the working voltage of the electrostatic loop in real time according to the deviation, forming a complete control link of monitoring-calculation-execution-feedback-correction. This mechanism ensures that the absorption system always operates in the optimal state, avoiding the problems of efficiency decline or excessive reagent addition caused by operating condition fluctuations in traditional open-loop control, and reducing operating costs while ensuring compliance with emission standards.

[0051] 4. By introducing surfactant efficiency coefficient, electrostatic charging efficiency coefficient and proportional adjustment coefficient, this invention transforms the complex multi-physics absorption process into a quantitative calculation formula that can be implemented in engineering, making it easier to promote and apply in practical engineering. Attached Figure Description

[0052] Figure 1 This is a schematic diagram of the process of the present invention. Detailed Implementation

[0053] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0054] The specific implementation of the present invention will be described in detail below with reference to specific embodiments.

[0055] Please see Figure 1 According to one embodiment of the present invention, a method for absorbing exhaust gas from asphalt processing includes:

[0056] S1. Obtain real-time operating parameters of asphalt exhaust gas, including exhaust gas temperature, exhaust gas pressure, exhaust gas volumetric flow rate, particulate matter concentration and organic matter concentration in the exhaust gas.

[0057] S2. Based on the operating parameters, obtain the target dynamic surface tension and target charge density;

[0058] S3. Based on the target dynamic surface tension and target charge density, obtain the required amount of surfactant and the electrostatic ring working voltage;

[0059] S4. Based on the amount of surfactant added and the working voltage of the electrostatic ring, the spray liquid is prepared and a voltage is applied to measure the actual dynamic surface tension and actual charge density of the spray liquid in real time.

[0060] S5. The prepared spray liquid is sprayed into the absorption tower to contact and absorb the asphalt tail gas, and the theoretical absorption efficiency is obtained based on the actual dynamic surface tension and actual charge density.

[0061] S6. Compare the theoretical absorption efficiency with the set target absorption efficiency. If the theoretical absorption efficiency is less than the target absorption efficiency, adjust the amount of surfactant added and / or the working voltage of the electrostatic ring, and return to step S4; otherwise, maintain the current parameters.

[0062] In this embodiment of the invention, in step S1, real-time operating parameters of the asphalt exhaust gas are acquired. These parameters include exhaust gas temperature, exhaust gas pressure, exhaust gas volumetric flow rate, particulate matter concentration, and organic matter concentration in the exhaust gas. These parameters can be acquired in various ways. For example, manual inspection can be used, where operators periodically use handheld measuring devices to sample and analyze the exhaust gas, obtain various parameter values, and manually input them into the control system. Alternatively, a series of independent sensors can be deployed, such as temperature sensors, pressure sensors, flow meters, particulate matter concentration sensors, and organic matter concentration analyzers. These sensors measure the corresponding operating parameters and transmit the data to the central control unit.

[0063] In step S2, based on the aforementioned operating parameters, the target dynamic surface tension and target charge density are obtained. This acquisition process aims to determine the ideal physical properties that the spray liquid should possess based on the actual conditions of the exhaust gas. One implementation method is to pre-establish a series of empirical lookup tables. For example, based on different particulate matter concentration ranges and exhaust gas temperature ranges, the corresponding target dynamic surface tension values ​​are looked up; based on different organic matter concentration ranges and exhaust gas volumetric flow rate ranges, the corresponding target charge density values ​​are looked up. These lookup tables can be constructed based on historical operating data or experimental results. Another implementation method is to use a simplified linear or polynomial regression model, taking the operating parameters as input, and calculating the target dynamic surface tension and target charge density through preset coefficients.

[0064] In step S3, based on the target dynamic surface tension and target charge density, the required surfactant addition amount and electrostatic ring operating voltage are obtained. This step transforms the theoretical target into a practically operable control command. Specifically, this can be determined using a preset empirical formula or proportional relationship. For example, a fixed proportionality coefficient can be set to correlate the target dynamic surface tension with the surfactant addition amount, i.e., the difference between the surfactant addition amount and the target dynamic surface tension is proportional. Similarly, the electrostatic ring operating voltage can be correlated with the target charge density through an empirical conversion coefficient.

[0065] In step S4, based on the obtained surfactant addition amount and the electrostatic ring operating voltage, the spray solution is prepared and a voltage is applied, while the actual dynamic surface tension and actual charge density of the spray solution are measured in real time. The preparation of the spray solution is typically achieved using a metering pump, which precisely injects the surfactant into the solvent according to the calculated addition amount to form a mixed spray solution. Voltage application can be accomplished by placing an electrostatic ring or electrode in the pipe through which the spray solution flows and connecting it to an adjustable high-voltage power supply. The real-time measurement requires the configuration of appropriate online sensors; for example, an online dynamic surface tension meter can be used to continuously monitor the surface tension of the spray solution, and an online charge density sensor or conductivity sensor can be used to acquire the charge density information of the spray solution in real time. These measurement data are fed back to the control system for subsequent evaluation and adjustment.

[0066] In step S5, the prepared spray liquid is injected into the absorption tower to contact and absorb the asphalt exhaust gas. The theoretical absorption efficiency is obtained based on the actual dynamic surface tension and actual charge density. After being atomized through the nozzle, the spray liquid comes into full contact with the asphalt exhaust gas in the absorption tower in the form of fine droplets, achieving the capture and dissolution of pollutants (such as particulate matter and organic matter). During this process, in order to evaluate the current absorption effect, it is necessary to obtain the theoretical absorption efficiency. One method is to obtain it based on a pre-established simplified absorption model. This model can take into account parameters such as the actual dynamic surface tension, actual charge density, and liquid-to-gas ratio of the spray liquid, and estimate the current theoretical absorption efficiency by looking up a table or using a simple linear interpolation method.

[0067] In step S6, the theoretical absorption efficiency is compared with the set target absorption efficiency. If the theoretical absorption efficiency is less than the target absorption efficiency, the amount of surfactant added and / or the electrostatic ring operating voltage are adjusted, and the system returns to step S4; otherwise, the current parameters are maintained. This step constitutes a closed-loop control mechanism. When the theoretical absorption efficiency does not reach the expected target, the system will trigger parameter adjustments. For example, a fixed adjustment strategy can be set, such as increasing the amount of surfactant added by a fixed small amount or increasing the electrostatic ring operating voltage by a fixed small amount when the efficiency is lower than the target value. This adjustment can be a single parameter adjustment or a coordinated adjustment of two parameters. After adjustment, the system will re-execute step S4, reconfigure the spray liquid and measure its properties, thus entering the next optimization cycle. If the theoretical absorption efficiency reaches or exceeds the target value, it indicates that the current parameter settings are effective, and the system will continue to operate with the existing parameters to save energy and reagent consumption.

[0068] The following example will provide a more detailed explanation of the above technical solution:

[0069] Suppose a user needs to purify the exhaust gas generated during asphalt production at an asphalt processing plant. This exhaust gas contains high concentrations of particulate matter and organic matter, and its operating parameters (such as temperature, flow rate, and pollutant concentration) fluctuate dynamically with changes in production load. The user sets a target absorption efficiency of 95%.

[0070] First, in step S1, the system acquires the operating parameters of the asphalt exhaust gas in real time. For example, the online sensor monitors the current exhaust gas temperature as 180℃, the exhaust gas pressure as 1.2 atmospheres, the exhaust gas volumetric flow rate as 10,000 cubic meters per hour, the particulate matter concentration as 500 mg / m³, and the organic matter concentration as 200 mg / m³. These data are transmitted to the control system in real time.

[0071] Next, in step S2, the control system calculates the target dynamic surface tension and target charge density that the spray liquid should achieve under the current operating conditions based on these real-time operating parameters. For example, based on the particulate matter concentration and exhaust gas temperature, the system calculates that the target dynamic surface tension should be 35 mN / m; based on the organic matter concentration and exhaust gas volumetric flow rate, the system calculates that the target charge density should be 15 μC / kg. These target values ​​are dynamically determined based on the exhaust gas characteristics, rather than being fixed.

[0072] Subsequently, in step S3, the control system obtains the required amount of surfactant to be added and the operating voltage of the electrostatic ring based on the calculated target dynamic surface tension of 35 mN / m, the target charge density of 15 μC / kg, and the set liquid-to-gas ratio. For example, the system calculates that to achieve a surface tension of 35 mN / m, the amount of surfactant to be added to the spray liquid is 5 kg / h; and to achieve a charge density of 15 μC / kg, the operating voltage applied by the electrostatic ring is 10 kV.

[0073] In step S4, the control system instructs the metering pump to add surfactant to the solvent at a rate of 5 kg / h, and instructs the high-voltage power supply to apply a 10 kV operating voltage to the electrostatic ring, thereby preparing a spray solution with specific physical properties. Simultaneously, online sensors measure the actual dynamic surface tension of the spray solution in real time, for example, 34.8 mN / m, and the actual charge density, for example, 14.9 μC / kg. These actual measurements are fed back to the control system.

[0074] In step S5, the prepared spray solution is injected into the absorption tower to fully contact and absorb the asphalt exhaust gas. During this process, the low surface tension of the spray solution helps to better wet and capture particulate matter and organic droplets in the exhaust gas, while its charge effectively enhances the capture efficiency of submicron-sized particulate matter and organic droplets through electrostatic adsorption. After absorption is complete, the control system calculates the current theoretical absorption efficiency based on the actual dynamic surface tension of the spray solution (34.8 mN / m), the actual charge density (14.9 μC / kg), and other operating parameters. For example, the calculation results show a theoretical absorption efficiency of 92%.

[0075] Finally, in step S6, the control system compares the theoretical absorption efficiency of 92% with the set target absorption efficiency of 95%. Since 92% is less than 95%, the system determines that the current absorption effect has not met the target. Therefore, the control system adjusts the surfactant addition amount and / or the electrostatic ring operating voltage according to the preset adjustment strategy. For example, the system may calculate that the surfactant addition amount needs to be increased by 0.5 kg / h and the electrostatic ring operating voltage needs to be increased by 0.5 kV. The adjusted new parameters (surfactant addition amount 5.5 kg / h, electrostatic ring operating voltage 10.5 kV) are sent back to step S4, the system reconfigures the spray liquid and measures it, and re-enters the absorption cycle. This closed-loop feedback process continues until the theoretical absorption efficiency reaches or exceeds the target absorption efficiency. At this point, the system will maintain the current parameters to ensure that the purification requirements are met while optimizing reagent and energy consumption.

[0076] Firstly, addressing the problem of large fluctuations in absorption efficiency caused by fixed spray liquid properties in existing technologies, this embodiment acquires exhaust gas operating parameters in real time in step S1, and calculates and obtains the target dynamic surface tension, target charge density, and corresponding surfactant addition amount and electrostatic ring operating voltage in real time based on these dynamic parameters in steps S2 and S3. For example, in the above example, when the exhaust gas operating conditions change, the system can dynamically adjust the surface tension of the spray liquid to 35 mN / m and apply a 10 kV voltage to achieve a charge density of 15 μC / kg. This ability to adaptively adjust the spray liquid properties according to the actual exhaust gas conditions overcomes the problem of rigid spray liquid parameters in traditional methods, ensuring that high absorption efficiency is maintained under different operating conditions and avoiding large fluctuations in efficiency.

[0077] Secondly, addressing the limitation of existing technologies in capturing submicron particles and organic droplets due to the lack of charge control over the spray liquid, this embodiment obtains the electrostatic ring operating voltage in step S3 and applies the voltage in step S4 to charge the spray liquid, forming charged droplets with the target charge density. In the example above, by applying a 10kV electrostatic ring operating voltage, the spray liquid is endowed with an actual charge density of 14.9μC / kg. When this charged spray liquid comes into contact with the exhaust gas in the absorption tower, it can effectively enhance the capture capacity of fine particles and organic droplets through electrostatic adsorption, thereby achieving a deeper purification effect. This has a technological advantage in treating fine pollutants compared to traditional spraying methods that rely solely on physical capture and dissolution.

[0078] Furthermore, addressing the issue of high energy and reagent consumption due to the lack of a closed-loop feedback mechanism based on actual absorption effects in existing technologies, this embodiment obtains the theoretical absorption efficiency in step S5 and compares it with the set target absorption efficiency in step S6, adjusting operating parameters based on the comparison result. In the example above, when the theoretical absorption efficiency (92%) is lower than the target absorption efficiency (95%), the system can automatically adjust the surfactant addition amount and / or the electrostatic loop operating voltage, and return to step S4 for recirculation optimization. This real-time closed-loop feedback control mechanism allows the system to adaptively optimize based on actual absorption effects, avoiding blind operation and excessive consumption of reagents and energy. Through continuous parameter adjustments, the system can achieve the expected purification target with minimal resource consumption, thereby reducing operating costs.

[0079] In summary, this embodiment effectively solves the problems of efficiency fluctuations, insufficient purification depth, and high energy and chemical consumption in existing asphalt exhaust gas treatment technologies by introducing dynamic parameter acquisition, adaptive control of spray liquid properties, and closed-loop feedback optimization mechanism. It provides an asphalt processing exhaust gas absorption method with higher efficiency, intelligence, and economy.

[0080] Preferably, in step S2, the target dynamic surface tension is obtained by the following formula:

[0081]

[0082] in, Indicates the dynamic surface tension of the target. This represents the dynamic surface tension of the solvent at a reference temperature. This indicates the physical concentration of particulate matter in the exhaust gas. This indicates the reference value for particulate matter concentration. Indicates the exhaust gas temperature. Indicates the temperature reference value. This represents the influence coefficient of particulate matter concentration. This represents the particulate matter concentration index coefficient. Indicates factors affecting temperature;

[0083] In step S2, the target charge density is obtained using the following formula:

[0084]

[0085] in, Indicates the target charge density. This represents the reference value for the base charge density. This indicates the concentration of organic matter in the exhaust gas. This indicates a reference value for organic matter concentration. Indicates the exhaust gas volumetric flow rate. This represents a reference value for traffic flow. This represents the influence coefficient of organic matter concentration. This represents the organic matter concentration index coefficient. This represents the flow rate impact coefficient.

[0086] Among them, the target dynamic surface tension This represents the desired dynamic surface tension value that the sprayed liquid will achieve when absorbing asphalt exhaust gas. This value is based on the particulate matter concentration in the exhaust gas. and exhaust gas temperature The dynamic calculations, designed to optimize the contact and capture efficiency of the spray liquid and particulate matter in the exhaust gas, are obtained through a pre-set mathematical model combined with real-time monitoring of exhaust gas operating parameters. The dynamic surface tension of the solvent at the reference temperature is also considered. This refers to the dynamic surface tension of the selected solvent at a specific standard temperature. This parameter serves as a reference value, reflecting the inherent physical properties of the solvent, and can be obtained through experimental measurement or by consulting standard physical property data. (The text also mentions particulate matter concentration in exhaust gas.) This refers to the content of solid or liquid particulate matter in asphalt exhaust gas. This parameter is one of the key factors affecting the surface tension requirements of the spray fluid and is usually obtained in real time using an online particulate matter monitor (such as a laser scattering particulate matter concentration meter or a beta-ray particulate matter concentration meter). Particulate matter concentration reference value. This is a preset reference value used to normalize particulate matter concentration. This value can be determined based on historical operating data, design conditions, or industry standards; for example, it can be set as the average particulate matter concentration under a typical operating condition. Exhaust gas temperature. This refers to the real-time temperature of asphalt exhaust gas. The exhaust gas temperature affects the physical properties of the spray solution and the movement of particulate matter, thus impacting the absorption effect. This parameter is typically measured in real-time using temperature sensors such as thermocouples or infrared thermometers. Temperature reference value. This is a preset reference value used to normalize the exhaust gas temperature. This value can be determined based on the solvent characteristics, the absorber's design temperature, or typical operating temperature; for example, it can be set to a standard ambient temperature or the average temperature at the absorber inlet. Particulate matter concentration influence coefficient. This is a dimensionless adjustment parameter used to quantify the effect of particulate matter concentration changes on the dynamic surface tension of a target. This coefficient is typically obtained through experimental calibration, numerical simulation, or empirical data fitting. (Particulate matter concentration index coefficient) This is a dimensionless exponential parameter used to describe the nonlinear relationship between particulate matter concentration and the dynamic surface tension of a target. This coefficient is also determined through experimental calibration or data fitting, reflecting the sensitivity of surface tension requirements to changes in particulate matter concentration. Temperature influence factors. It is a dimensionless exponential parameter used to describe the nonlinear relationship between exhaust gas temperature and the target dynamic surface tension. This coefficient is determined experimentally or empirically and reflects the sensitivity of temperature changes to the surface tension requirements of the spray liquid.

[0087] Target charge density This indicates the desired charge density value that the spraying fluid will achieve when absorbing asphalt exhaust gas. This value is based on the concentration of organic matter in the exhaust gas. and exhaust gas volume flow rate The dynamic calculations, designed to optimize the electrostatic adsorption and capture efficiency of the spray fluid on organic matter in the exhaust gas, are obtained through a pre-set mathematical model combined with real-time monitored exhaust gas operating parameters. (Base charge density reference value) This refers to the baseline charge density that the spray fluid should possess under specific reference operating conditions. This parameter serves as a benchmark value, reflecting the charge density requirement without the influence of specific organic matter or flow rate. It can be determined experimentally or based on design requirements. Organic matter concentration in the exhaust gas. This refers to the content of volatile organic compounds (VOCs) in asphalt exhaust gas. This parameter is one of the key factors affecting the charge density requirements of the spray liquid and is usually monitored in real time using equipment such as online gas chromatographs, Fourier transform infrared spectroscopy (FTIR), or total organic carbon (TOC) analyzers. Reference values ​​for organic matter concentration. This is a preset reference value used to normalize organic matter concentration. This value can be determined based on environmental emission standards, design conditions, or historical data; for example, it can be set as a certain allowable emission limit or typical operating concentration. Exhaust gas volumetric flow rate. This refers to the real-time volumetric flow rate of asphalt exhaust gas passing through the absorption tower. The exhaust gas flow rate affects the contact time between the spray liquid and the exhaust gas, as well as the efficiency of electrostatic adsorption. This parameter is typically measured in real-time using flow sensors such as orifice plate flow meters, vortex flow meters, or ultrasonic flow meters. Flow reference value. This is a preset reference value used to normalize the exhaust gas volumetric flow rate. This value can be determined based on the absorber's design capacity or typical operating flow rate; for example, it can be set as the absorber's maximum design flow rate or average operating flow rate. Organic matter concentration influence coefficient. This is a dimensionless adjustment parameter used to quantify the effect of changes in organic matter concentration on the target charge density. This coefficient is typically obtained through experimental calibration, numerical simulation, or empirical data fitting. Organic matter concentration index coefficient. This is a dimensionless exponential parameter used to describe the nonlinear relationship between organic matter concentration and target charge density. This coefficient is also determined through experimental calibration or data fitting, reflecting the sensitivity of changes in organic matter concentration to charge density requirements. Flow Influence Coefficient It is a dimensionless exponential parameter used to describe the nonlinear relationship between exhaust gas volume flow rate and target charge density. This coefficient is determined experimentally or empirically and reflects the sensitivity of flow rate changes to the charge density requirements of the spray liquid.

[0088] In the aforementioned exhaust gas absorption method for asphalt processing, in order to overcome the limitation of traditional methods in accurately determining the spray fluid parameters under dynamic working conditions, this application introduces a mathematical model based on real-time working condition parameters to dynamically calculate the target dynamic surface tension. and target charge density Specifically, by obtaining the exhaust gas temperature and the concentration of particulate matter in exhaust gas By substituting this into the preset surface tension calculation formula, the target dynamic surface tension that the spray fluid should possess under the current working conditions can be accurately obtained. This formula takes into account the dynamic surface tension of the solvent at the reference temperature. The effects of particulate matter concentration and temperature on surface tension were investigated using the particulate matter concentration influence coefficient. Particulate matter concentration index coefficient and temperature-related factors Adjustments were made to ensure that the calculation results accurately reflected the actual requirements of particulate matter in the exhaust gas on the surface tension of the spray liquid. Simultaneously, the concentration of organic matter in the exhaust gas was obtained. and exhaust gas volume flow rate By substituting this into the preset charge density calculation formula, the target charge density that the spray fluid should possess under the current operating conditions can be dynamically obtained. The formula uses the base charge density reference value. Based on the influence coefficient of organic matter concentration, Organic matter concentration index coefficient and flow impact coefficient The impact of organic matter concentration and exhaust gas flow rate is quantified to ensure that the charge density of the spray fluid can effectively respond to changes in organic matter in the exhaust gas. This dynamic calculation mechanism based on real-time operating parameters enables the physicochemical properties of the spray fluid to be highly matched with the actual characteristics of asphalt exhaust gas, thus providing a scientific basis for the precise configuration of the subsequent spray fluid and voltage application, significantly improving the targeting and effectiveness of exhaust gas absorption.

[0089] The following is a concrete example to illustrate this. Suppose that during the asphalt processing, the exhaust gas treatment system monitors the exhaust gas temperature in real time using sensors installed in the flue. At 150℃, the concentration of particulate matter in the exhaust gas The concentration was 200 mg / m³, and the concentration of organic matter in the exhaust gas was monitored by an online analyzer. The exhaust gas volumetric flow rate is 50 ppm. The capacity is 10,000 m³ / h. The control system is preset with the dynamic surface tension of the solvent at the reference temperature. The particulate matter concentration reference value is 70 mN / m. 100 mg / m³, temperature reference value The temperature is 100℃. A baseline charge density reference value is also preset. The reference value for organic matter concentration is 10 μC / kg. 20ppm, reference flow rate The capacity is 8000 m³ / h. Relevant empirical coefficients. , , , , , It has also been determined through preliminary experiments, data fitting, or expert experience assignment. For example, It can be set to 0.5. It can be set to 0.8. It can be set to 0.3; It can be set to 0.2. It can be set to 1.2. It can be set to 0.5. In this case, the control system can use the provided formula to calculate the target dynamic surface tension required under the current operating conditions based on the real-time monitoring data and preset parameters. and target charge density These calculations were subsequently used to guide the amount of surfactant added and the setting of the electrostatic ring's operating voltage.

[0090] Through the above technical solution, this application can dynamically and accurately determine the target dynamic surface tension and target charge density of the spraying liquid based on the real-time changing operating parameters of asphalt exhaust gas. This quantitative calculation method based on mathematical models overcomes the limitations of traditional experience-based judgment or fixed parameter settings, enabling the physicochemical properties of the spraying liquid to be highly matched with the actual content, temperature, flow rate, and other factors of particulate matter and organic matter in the exhaust gas. Therefore, the spraying liquid can more effectively wet and capture particulate matter in the exhaust gas and remove organic matter more efficiently through electrostatic adsorption, significantly improving the targeting, stability, and overall efficiency of asphalt exhaust gas absorption, and avoiding the decline in absorption effect or resource waste caused by parameter mismatch.

[0091] Preferably, in step S3:

[0092] First, the spray volumetric flow rate is obtained based on the set liquid-to-gas ratio and exhaust gas volumetric flow rate:

[0093]

[0094] in, Indicates the spray volumetric flow rate. This indicates the set liquid-to-gas ratio. Indicates the exhaust gas volumetric flow rate;

[0095] Secondly, the amount of surfactant added is determined based on the spray volumetric flow rate and the target dynamic surface tension.

[0096]

[0097] in, Indicates the amount of surfactant added. This represents the dynamic surface tension of the solvent at the current temperature. Indicates the dynamic surface tension of the target. The surfactant efficiency coefficient (unit: (mN / m)·h / kg) represents the amount of surfactant added per 1 kg / h increase in flow rate. The surface tension value that can be reduced (below) Indicates the volumetric flow rate of the spray liquid;

[0098] In step S3, the electrostatic working voltage is obtained using the following formula:

[0099]

[0100] in, Indicates the operating voltage of the electrostatic ring. Indicates the target charge density. Indicates the volumetric flow rate of the spray liquid. It represents the electrostatic charging efficiency coefficient (unit: (μC / kg)·(m³ / h) / kV).

[0101] The set liquid-to-gas ratio R refers to the ratio between the volumetric flow rate of the sprayed liquid and the volumetric flow rate of the exhaust gas to be treated during the asphalt exhaust gas absorption process. This ratio is usually preset based on the design of the absorption tower, the characteristics of the exhaust gas, and the desired absorption effect. For example, it can be determined based on empirical values ​​or through experimental optimization to ensure that the sprayed liquid can fully cover the pollutants in the exhaust gas while avoiding over-spraying and resource waste. This ratio can be a fixed value or dynamically adjusted within a certain range according to the characteristics of the exhaust gas. Spray volumetric flow rate This refers to the volume of spray liquid injected into the absorption tower per unit time. Its function is to serve as a basis for subsequent calculations of surfactant dosage and electrostatic ring operating voltage, ensuring that the supply of spray liquid matches the tail gas treatment requirements. The spray volumetric flow rate can be precisely controlled using a metering pump or flow meter, for example, by adjusting the pump speed or valve opening. Target dynamic surface tension. This refers to the surface tension value desired by the spraying fluid to achieve optimal absorption when it comes into contact with asphalt exhaust gas. This value is dynamically calculated based on real-time operating parameters such as particulate matter concentration and temperature in the exhaust gas. Its purpose is to guide the addition of surfactants to optimize the spraying fluid's ability to capture particulate matter and organic matter in the exhaust gas. Surfactant addition amount... This refers to the mass of surfactant that needs to be added to the spray solution per unit time. Its function is to adjust the dynamic surface tension of the spray solution to achieve the target dynamic surface tension. The addition of surfactant can be achieved through metering pumps, titration devices, or automatic proportioning systems. For example, the amount added can be precisely controlled by controlling the running time or flow rate of the addition pump. The dynamic surface tension of the solvent at the current temperature. This refers to the surface tension of a pure solvent (such as water or wash oil) without surfactants at the current ambient temperature. This parameter is the benchmark for calculating the required amount of surfactant to add because it reflects the inherent wetting properties of the solvent itself. This value can be obtained by consulting a table of solvent physical properties or through experimental measurement. Surfactant efficiency coefficient This is a parameter characterizing the effectiveness of a surfactant. It represents the reduction in surface tension of the spray liquid by a unit increase in surfactant dosage at a specific flow rate. This coefficient is usually obtained through experimental calibration, expert experience assignment, or fitting of historical data. Its function is to quantify the effect of surfactant on surface tension, thereby accurately calculating the required dosage. (Electrostatic ring operating voltage) This is the voltage applied to the electrostatic ring, used to charge the spray liquid, giving it a charge. Its function is to generate an electric field, enhancing the spray liquid's ability to adsorb charged or polarizable particles in the exhaust gas, thus improving absorption efficiency. The operating voltage of the electrostatic ring can be adjusted and controlled by a high-voltage power supply, for example, by adjusting the power supply's output voltage or current. Target charge density This refers to the amount of charge per unit volume of spray fluid required to achieve optimal absorption when it comes into contact with asphalt exhaust gas. This value is dynamically calculated based on real-time operating parameters such as the concentration of organic matter and the volumetric flow rate in the exhaust gas. Its function is to guide the voltage application of the electrostatic ring, thereby optimizing the spray fluid's electrostatic capture ability of organic matter and particulate matter in the exhaust gas. Electrostatic charging efficiency coefficient. It is a parameter characterizing the charging efficiency of the electrostatic ring, representing the charge density that the spray liquid can obtain under a specific spray liquid volume flow rate when a unit voltage is applied. This coefficient is usually obtained through experimental calibration, expert experience assignment, or historical data fitting. Its function is to quantify the influence of the electrostatic ring voltage on the charge density, thereby accurately calculating the required working voltage.

[0102] This application's solution achieves dynamic regulation of key parameters of the spray liquid through a series of precise calculations and controls. First, based on real-time acquired exhaust gas operating parameters, the system can dynamically determine the optimal target dynamic surface tension and target charge density of the spray liquid under the current operating conditions. Building upon this, to transform these theoretical target values ​​into practically operable control parameters, this application introduces a precise calculation mechanism. Based on the preset liquid-to-gas ratio and the real-time measured exhaust gas volumetric flow rate, the system can accurately calculate the required spray liquid volumetric flow rate, ensuring a dynamic match between the spray liquid supply and exhaust gas treatment needs. Subsequently, using the calculated spray liquid volumetric flow rate, target dynamic surface tension, and the solvent's own dynamic surface tension, combined with the surfactant's efficiency coefficient, the system can accurately calculate the amount of surfactant required to achieve the target surface tension, thereby optimizing the spray liquid's wettability and capture capability. Simultaneously, combining the spray liquid volumetric flow rate, target charge density, and electrostatic charging efficiency coefficient, the system can accurately calculate the operating voltage required for the electrostatic ring, and by applying this voltage, enhance the electrostatic adsorption of charged or polarizable pollutants in the exhaust gas by the spray liquid. This dynamic and quantitative control method allows the physicochemical properties of the spray fluid to adapt to changes in exhaust gas conditions in real time, thus overcoming the problems of large fluctuations in absorption efficiency and poor adaptability caused by fixed parameters or empirical adjustments in traditional methods. The entire process forms the basis of a closed-loop control, providing accurate input for subsequent absorption efficiency evaluation and parameter optimization, ensuring the high efficiency and stability of the asphalt exhaust gas absorption process.

[0103] The following is a concrete example illustrating this. In an asphalt processing exhaust gas absorption system, sensors first monitor the temperature, pressure, volumetric flow rate, particulate matter concentration, and organic matter concentration of the asphalt exhaust gas in real time. This real-time data is input into a control unit. Based on a preset mathematical model, the control unit calculates the target dynamic surface tension and target charge density that the spraying liquid should achieve under the current operating conditions. Next, the control unit calculates the required spraying liquid volumetric flow rate based on the system's preset liquid-to-gas ratio and the real-time measured exhaust gas volumetric flow rate. For example, if the exhaust gas flow rate increases, the spraying liquid volumetric flow rate will also increase accordingly to maintain the set liquid-to-gas ratio. Then, the control unit uses the calculated spraying liquid volumetric flow rate, the target dynamic surface tension, and the dynamic surface tension of the solvent (e.g., water or wash oil) at the current temperature, combined with a pre-calibrated surfactant efficiency coefficient, to accurately calculate the mass flow rate of the surfactant to be added to the spraying liquid. This calculation result is sent to a metering pump, which precisely injects the surfactant into the spraying liquid preparation tank according to instructions. Simultaneously, the control unit uses the calculated spray liquid volumetric flow rate and target charge density, combined with a pre-calibrated electrostatic charging efficiency coefficient, to precisely calculate the operating voltage required for the electrostatic ring. This calculation result is sent to a high-voltage power supply, which adjusts its output voltage according to instructions and applies it to the electrostatic ring inside the absorption tower, thereby charging the spray liquid. Through this process, the dynamic surface tension and charge density of the spray liquid are precisely adjusted to the optimal state matching the current exhaust gas conditions before entering the absorption tower.

[0104] Through the above technical solution, this application enables precise and dynamic control of key parameters of the spray fluid during the absorption of asphalt exhaust gas. Specifically, by calculating the target dynamic surface tension and target charge density based on real-time exhaust gas operating parameters, and combining the spray fluid volumetric flow rate, solvent characteristics, and efficiency coefficient, this method can quantitatively determine the amount of surfactant added and the operating voltage of the electrostatic ring. This quantitative and dynamic adjustment mechanism allows the wettability and electrostatic adsorption capacity of the spray fluid to adapt to changes in exhaust gas composition and flow rate in real time, thereby avoiding the problems of large fluctuations in absorption efficiency and poor adaptability caused by traditional empirical or fixed parameter control methods. Ultimately, this helps to significantly improve the absorption efficiency of particulate matter and organic matter in asphalt exhaust gas, ensure emission compliance, and optimize operating costs.

[0105] Preferably, in step S5, the theoretical absorption efficiency is obtained by the following formula:

[0106]

[0107] in, Indicates the theoretical absorption efficiency. This indicates the reference dynamic surface tension (taken from the dynamic surface tension of the solvent itself). This represents the actual dynamic surface tension. Represents the reference charge density. Represents the actual charge density, Indicates the volumetric flow rate of the spray liquid. Indicates exhaust gas flow rate. This represents the baseline coefficient for absorption efficiency. Indicates the surface tension index. Indicates the charge density index, This indicates the liquid-to-gas ratio index.

[0108] Theoretical absorption efficiency represents the expected removal capacity of the absorption system for pollutants in asphalt exhaust gas under current operating conditions. It is a quantitative indicator used to evaluate the effect of the spray liquid after contact absorption with the exhaust gas. By calculating the theoretical absorption efficiency, the performance of the absorption process can be predicted, providing data support for subsequent system optimization and parameter adjustment. This can be achieved through calculation using a pre-established mathematical model or by fitting experimental data. Reference dynamic surface tension refers to the dynamic surface tension of the solvent itself under specific reference conditions. It is usually taken as the inherent dynamic surface tension of the solvent without the addition of surfactant. This parameter serves as a benchmark value to measure the degree to which the addition of surfactant changes the dynamic surface tension of the spray liquid, thus reflecting its potential impact on absorption efficiency. Actual dynamic surface tension refers to the dynamic surface tension of the spray liquid measured in real time after the spray liquid is prepared and voltage is applied. This parameter directly reflects the current physical properties of the spray liquid and is one of the key factors affecting absorption efficiency. Its measurement can be achieved using an online surface tension meter, such as the oscillating jet method or the maximum bubble pressure method. Reference charge density refers to the baseline charge density of the spray liquid under specific reference conditions. This parameter serves as a benchmark value to measure the change in the charge density of the spray liquid after voltage is applied by the electrostatic ring, thus reflecting its potential impact on absorption efficiency. Actual charge density refers to the real-time charge density of the spray liquid after it has been prepared and voltage applied. This parameter directly reflects the current charged state of the spray liquid and is another key factor affecting absorption efficiency. Its measurement can be achieved using an online charge density sensor, such as a Faraday cylinder or an electrostatic induction probe. Spray liquid volumetric flow rate refers to the volume of spray liquid entering the absorption tower per unit time. This parameter directly affects the contact area and contact time between the spray liquid and the exhaust gas, and is an important operating parameter affecting absorption efficiency. It can be monitored and controlled in real time using a flow meter. Exhaust gas flow rate refers to the volume of asphalt exhaust gas entering the absorption tower per unit time. This parameter reflects the load of the exhaust gas to be treated and is another important operating parameter affecting absorption efficiency. It can be monitored in real time using a flow meter. The absorption efficiency benchmark coefficient is an empirical parameter reflecting the basic absorption efficiency level achievable by the absorption system under ideal or benchmark conditions. This coefficient is typically obtained through experimental calibration, historical data analysis, or expert assignment, and is used to calibrate theoretical absorption efficiency models. The surface tension exponent is an empirical parameter used to quantify the impact of dynamic surface tension changes in the spray liquid on absorption efficiency. This exponent is typically obtained through experimental data fitting or expert assignment, reflecting the nonlinear relationship between surface tension and absorption efficiency. The charge density exponent is an empirical parameter used to quantify the impact of changes in the charge density of the spray liquid on absorption efficiency. This exponent is typically obtained through experimental data fitting or expert assignment, reflecting the nonlinear relationship between charge density and absorption efficiency.The liquid-to-gas ratio index is an empirical parameter used to quantify the influence of the ratio of spray liquid volume flow rate to exhaust gas flow rate (i.e., liquid-to-gas ratio) on absorption efficiency. This index is usually obtained by fitting experimental data or by assigning values ​​based on expert experience, and reflects the nonlinear relationship between the liquid-to-gas ratio and absorption efficiency.

[0109] In the aforementioned method for absorbing exhaust gas from asphalt processing, to achieve accurate evaluation and optimized control of the absorption process, this application further proposes a method for obtaining the theoretical absorption efficiency. This method uses a comprehensive mathematical model to calculate the actual dynamic surface tension of the sprayed liquid obtained from actual measurements. and actual charge density And key operating parameters, including spray liquid volumetric flow rate. and exhaust gas flow This model combines preset reference values ​​(reference dynamic surface tension, reference charge density) with empirical coefficients (absorption efficiency benchmark coefficient, surface tension index, charge density index, liquid-to-gas ratio index) obtained through experimental calibration or empirical assignment. Specifically, the model quantifies the combined effects of changes in actual dynamic surface tension relative to reference dynamic surface tension, changes in actual charge density relative to reference charge density, and the liquid-to-gas ratio on absorption efficiency through exponential functions. This reflects the promoting effect of surfactants in reducing surface tension on absorption. This reflects the effect of electrostatic charge on enhancing particulate matter capture efficiency. This term reflects the impact of the liquid-to-gas ratio on mass transfer and capture efficiency. In this way, the system can dynamically calculate a theoretical absorption efficiency based on real-time operating conditions. Obtaining this theoretical absorption efficiency elevates the entire absorption method from merely adjusting and measuring parameters to a level capable of quantitatively predicting the current absorption effect. This provides a solid theoretical basis and quantitative standard for the subsequent step S6, which compares the theoretical absorption efficiency with the set target absorption efficiency and adjusts the surfactant dosage and / or the electrostatic ring operating voltage accordingly. This forms a closed-loop, intelligent control system, ensuring that the absorption process always operates at or near-optimal efficiency.

[0110] The following is a specific example to illustrate this. In the asphalt exhaust gas absorption process, assume that the actual dynamic surface tension of the spray fluid is measured in step S4. The actual charge density is 35 mN / m. The concentration was 15 μC / kg. Simultaneously, the spray liquid volumetric flow rate was monitored using a flow meter. The exhaust gas flow rate is 10 m³ / h. The flow rate is 1000 m³ / h. The preset reference dynamic surface tension... The dynamic surface tension (i.e., the solvent itself) is 72 mN / m, and the reference charge density is... The value is 5 μC / kg. The baseline coefficient for absorption efficiency was determined through prior experimental calibration or expert evaluation. The surface tension index is 0.05. The charge density index is 0.8. The liquid-to-gas ratio is 0.6. The value is 0.4. Substituting these values ​​into the formula for calculating the theoretical absorption efficiency yields... =0.85. This calculation result will serve as a quantitative assessment of the absorption effect under the current operating conditions, used to compare it with the set target absorption efficiency, thereby guiding subsequent parameter adjustments.

[0111] Through the above technical solution, this application overcomes the problem of lacking quantitative basis for evaluating the absorption effect in traditional asphalt exhaust gas absorption methods. By introducing the calculation of theoretical absorption efficiency, the system can accurately predict and quantitatively evaluate the performance of the absorption process based on real-time operating parameters and actual measurements. This predictive capability means that when the system adjusts parameters in step S6, it is no longer blindly trying or relying on experience, but has a clear theoretical basis. Specifically, when the theoretical absorption efficiency is lower than the target absorption efficiency, the system can promptly and accurately identify the performance deficiency and guide the adjustment of surfactant addition and / or electrostatic ring working voltage based on the quantitative results, thereby ensuring that the absorption process always maintains a high-efficiency operating state. This significantly improves the intelligence, stability, and optimization level of the asphalt exhaust gas absorption process, effectively reduces operating costs, and ensures that emissions meet standards.

[0112] Preferably, in step S6, the method for adjusting the amount of surfactant added and / or the working voltage of the electrostatic ring is as follows:

[0113] The corrected value for surfactant addition amount is obtained based on theoretical absorption efficiency and target absorption efficiency:

[0114]

[0115] in, This indicates the correction value for the amount of surfactant added. Indicates the target absorption efficiency. Indicates the theoretical absorption efficiency. This indicates the adjustment coefficient for the proportion of addition (unit: kg / h).

[0116] The correction value for the operating voltage of the electrostatic loop is obtained based on the theoretical absorption efficiency and the target absorption efficiency.

[0117]

[0118] in, Correction value for the operating voltage of the electrostatic ring. Indicates the target absorption efficiency. Indicates the theoretical absorption efficiency. This represents the voltage proportional regulation coefficient (unit: kV).

[0119] The updated dosage and updated voltage are obtained based on the surfactant addition correction value and the electrostatic ring working voltage correction value:

[0120]

[0121]

[0122] in, Indicates the amount added in the update. Indicates updated voltage. Indicates the amount of surfactant added. This indicates the correction value for the amount of surfactant added. Indicates the operating voltage of the electrostatic ring. Correction value for the working voltage of the electrostatic ring.

[0123] In this embodiment of the invention, the adjustment method includes obtaining a correction value for the amount of surfactant added based on the theoretical absorption efficiency and the target absorption efficiency. This correction value represents the amount of surfactant needed to bring the theoretical absorption efficiency closer to the target absorption efficiency. Its function is to quantify the difference between the current absorption effect and the target, and to translate this difference into a specific adjustment instruction for the surfactant dosage. This correction value can be calculated by multiplying the difference between the target absorption efficiency and the theoretical absorption efficiency by a preset dosage ratio adjustment coefficient. This is used to determine, for example, when the theoretical absorption efficiency is lower than the target absorption efficiency, the correction value is positive, indicating that the amount of surfactant needs to be increased. The adjustment coefficient for the amount added. It is a proportional factor used to convert the absorption efficiency deviation into a surfactant addition correction value. Its function is to determine the system's response sensitivity to the absorption efficiency deviation, that is, the magnitude of surfactant addition adjustment when the absorption efficiency deviates from the target value. This coefficient can be determined through experimental calibration, empirical setting, or optimization based on control theory (such as the proportional term in PID control).

[0124] In addition, the method also includes obtaining the electrostatic loop operating voltage correction value based on the theoretical absorption efficiency and the target absorption efficiency. This correction value represents the operating voltage of the electrostatic ring required to bring the theoretical absorption efficiency closer to the target absorption efficiency. Its function is to quantitatively adjust the electrostatic field strength based on the deviation in absorption effect. This correction value can be calculated by multiplying the difference between the target and theoretical absorption efficiency by a preset voltage proportional adjustment coefficient. This is obtained, for example, when the theoretical absorption efficiency is lower than the target absorption efficiency, the correction value is positive, indicating that the operating voltage of the electrostatic ring needs to be increased. Voltage proportional adjustment coefficient. It is a proportional factor used to convert the absorption efficiency deviation into a correction value for the electrostatic loop operating voltage. Its function is to determine the system's response sensitivity to the absorption efficiency deviation, that is, the magnitude of the adjustment of the electrostatic loop operating voltage when the absorption efficiency deviates from the target value. This coefficient can also be determined through experimental calibration, empirical setting, or optimization based on control theory.

[0125] Based on this, the method further uses a correction value for the amount of surfactant added. Correction value for the working voltage of the electrostatic ring Get Update Added Quantity and updating voltage Among them, the amount of updates added. This refers to the current amount of surfactant added. Based on this, a correction value for the amount of surfactant added is added. The resulting new surfactant dosage serves to provide a corrected dosage that better suits the current operating conditions and target absorption efficiency requirements, guiding the subsequent preparation of the spray solution. (Update voltage) This refers to the current operating voltage of the electrostatic ring. Based on this, the working voltage correction value of the electrostatic ring is added. The new electrostatic loop operating voltage obtained thereafter serves to provide a corrected electrostatic loop operating voltage that better matches the current operating conditions and target absorption efficiency requirements, in order to guide the subsequent application of the electrostatic field.

[0126] The proposed solution introduces a dynamic feedback adjustment mechanism to ensure that the asphalt exhaust gas absorption process can continuously and stably achieve the preset target absorption efficiency. Specifically, during system operation, the theoretical absorption efficiency is first calculated based on real-time operating parameters. Subsequently, the absorption efficiency of this theory was studied. With the pre-set target absorption efficiency Compare them. If the theoretical absorption efficiency is found... Below target absorption efficiency This indicates that the current spray liquid parameters have failed to achieve the expected absorption effect. In this case, the system will adjust the dosage ratio based on the deviation between the two parameters using a preset adjustment coefficient. and voltage proportional adjustment coefficient The correction values ​​for surfactant addition amount were calculated respectively. and the correction value of the operating voltage of the electrostatic ring These correction values ​​quantify the amount of parameter adjustment required to compensate for insufficient absorption efficiency. These correction values ​​are then individually added to the current surfactant dosage. and the operating voltage of the electrostatic ring This allows us to obtain the updated and added amount. and update voltage These updated parameters are then fed back to the spray fluid configuration and voltage application stages, prompting the system to reconfigure the spray fluid and apply corresponding voltages. This, in turn, affects the actual dynamic surface tension and actual charge density, ultimately causing the fluid to re-enter the absorption tower to contact and absorb the asphalt exhaust gas, and the theoretical absorption efficiency to be recalculated. This cyclical adjustment process forms a closed-loop control system, enabling the absorption method to self-correct based on actual operating results. This overcomes the problem of substandard absorption efficiency that may result from relying solely on predicted parameters, ensuring the robustness and high efficiency of the absorption process.

[0127] As a specific implementation method, the above adjustment method can be implemented by a controller integrated into the control system. This controller can be a programmable logic controller (PLC) or an industrial computer, internally running a preset control algorithm. When the theoretical absorption efficiency calculated in step S5... Below target absorption efficiency When the time comes, the controller will immediately initiate the adjustment program. For example, the controller can adjust according to the formula... and Calculate the required correction value. This includes the proportional adjustment coefficient. and These values ​​can be pre-determined through experimental testing, system identification methods, or expert experience, and stored in the controller's parameter library. The controller then modifies these correction values ​​with the current surfactant addition amount. and the operating voltage of the electrostatic ring Perform algebraic operations to generate new control instructions, i.e., update the added quantity. and update voltage These new instructions are sent to the corresponding actuators via analog or digital output modules. For example, they may control the frequency converter of the surfactant metering pump to adjust its speed, thereby changing the dosage; or control the output of the high-voltage power supply to adjust the operating voltage of the electrostatic ring. After the actuators complete the adjustment, the system returns to step S4 to remeasure the actual dynamic surface tension and actual charge density of the spray liquid, and re-enters the absorption cycle until the theoretical absorption efficiency reaches or exceeds the target absorption efficiency.

[0128] Through the above technical solution, this application provides a dynamic and adaptive method for asphalt exhaust gas absorption. This method can monitor the absorption effect in real time and automatically adjust key operating parameters, namely the surfactant dosage and / or the electrostatic loop operating voltage, based on the deviation between the theoretical absorption efficiency and the target absorption efficiency. This effectively solves the problem that relying solely on preset or static parameters is insufficient to continuously guarantee absorption efficiency under complex and variable asphalt exhaust gas conditions. By introducing a feedback control mechanism, the system can continuously optimize and correct the absorption effect, thereby ensuring that the asphalt exhaust gas treatment process always maintains a highly efficient and stable state, significantly improving the reliability of exhaust gas absorption and the ability to meet emission standards.

[0129] Preferably, the solvent is water or washing oil.

[0130] A tail gas absorption device for asphalt processing adopts the above-mentioned tail gas absorption method for asphalt processing.

[0131] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus.

[0132] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A method for absorbing exhaust gas from asphalt processing, characterized in that, include: S1. Obtain real-time operating parameters of asphalt exhaust gas, including exhaust gas temperature, exhaust gas pressure, exhaust gas volumetric flow rate, particulate matter concentration and organic matter concentration in the exhaust gas. S2. Based on the operating parameters, obtain the target dynamic surface tension and target charge density; S3. Based on the target dynamic surface tension and target charge density, obtain the required amount of surfactant and the electrostatic ring working voltage; S4. Based on the amount of surfactant added and the working voltage of the electrostatic ring, the spray liquid is prepared and a voltage is applied to measure the actual dynamic surface tension and actual charge density of the spray liquid in real time. S5. The prepared spray liquid is sprayed into the absorption tower to contact and absorb the asphalt tail gas, and the theoretical absorption efficiency is obtained based on the actual dynamic surface tension and actual charge density. S6. Compare the theoretical absorption efficiency with the set target absorption efficiency. If the theoretical absorption efficiency is less than the target absorption efficiency, adjust the amount of surfactant added and / or the working voltage of the electrostatic ring, and return to step S4; otherwise, maintain the current parameters.

2. The method for absorbing exhaust gas from asphalt processing according to claim 1, characterized in that, In step S2: The target dynamic surface tension is obtained using the following formula: ； in, Indicates the dynamic surface tension of the target. This represents the dynamic surface tension of the solvent at a reference temperature. This indicates the physical concentration of particulate matter in the exhaust gas. This indicates the reference value for particulate matter concentration. Indicates the exhaust gas temperature. Indicates the temperature reference value. This represents the influence coefficient of particulate matter concentration. This represents the particulate matter concentration index coefficient. This indicates the factors that affect temperature.

3. The method for absorbing exhaust gas from asphalt processing according to claim 2, characterized in that, In step S2, the target charge density is obtained using the following formula: ； in, Indicates the target charge density. This represents the reference value for the base charge density. This indicates the concentration of organic matter in the exhaust gas. This indicates a reference value for organic matter concentration. Indicates the exhaust gas volumetric flow rate. This represents a reference value for traffic flow. This represents the influence coefficient of organic matter concentration. This represents the organic matter concentration index coefficient. This represents the flow rate impact coefficient.

4. The method for absorbing exhaust gas from asphalt processing according to claim 3, characterized in that, In step S3: First, the spray volumetric flow rate is obtained based on the set liquid-to-gas ratio and exhaust gas volumetric flow rate: ； in, Indicates the spray volumetric flow rate. This indicates the set liquid-to-gas ratio. Indicates the exhaust gas volumetric flow rate; Secondly, the amount of surfactant added is determined based on the spray volumetric flow rate and the target dynamic surface tension. ； in, Indicates the amount of surfactant added. This represents the dynamic surface tension of the solvent at the current temperature. Indicates the dynamic surface tension of the target. This represents the surfactant efficiency coefficient. This indicates the volumetric flow rate of the spray liquid.

5. The method for absorbing exhaust gas from asphalt processing according to claim 4, characterized in that, In step S3, the electrostatic working voltage is obtained using the following formula: ； in, Indicates the operating voltage of the electrostatic ring. Indicates the target charge density. Indicates the volumetric flow rate of the spray liquid. This represents the electrostatic charging efficiency coefficient.

6. The method for absorbing exhaust gas from asphalt processing according to claim 5, characterized in that, In step S5, the theoretical absorption efficiency is obtained using the following formula: ； in, Indicates the theoretical absorption efficiency. This indicates the reference dynamic surface tension (taken from the dynamic surface tension of the solvent itself). This represents the actual dynamic surface tension. Represents the reference charge density. Represents the actual charge density, Indicates the volumetric flow rate of the spray liquid. Indicates exhaust gas flow rate. This represents the baseline coefficient for absorption efficiency. Indicates the surface tension index. Indicates the charge density index, This indicates the liquid-to-gas ratio index.

7. The method for absorbing exhaust gas from asphalt processing according to claim 6, characterized in that, In step S6, the method for adjusting the amount of surfactant added and / or the working voltage of the electrostatic ring is as follows: The corrected value for surfactant addition amount is obtained based on theoretical absorption efficiency and target absorption efficiency: ； in, This indicates the correction value for the amount of surfactant added. Indicates the target absorption efficiency. Indicates the theoretical absorption efficiency. This indicates the coefficient for adjusting the proportion of added ingredients; The correction value for the operating voltage of the electrostatic loop is obtained based on the theoretical absorption efficiency and the target absorption efficiency. ； in, Correction value for the operating voltage of the electrostatic ring. Indicates the target absorption efficiency. Indicates the theoretical absorption efficiency. This represents the voltage proportional adjustment coefficient; The updated dosage and updated voltage are obtained based on the surfactant addition correction value and the electrostatic ring working voltage correction value: ； ； in, Indicates the amount added in the update. Indicates updated voltage. Indicates the amount of surfactant added. This indicates the correction value for the amount of surfactant added. Indicates the operating voltage of the electrostatic ring. Correction value for the working voltage of the electrostatic ring.

8. The method for absorbing exhaust gas from asphalt processing according to any one of claims 1-7, characterized in that, The solvent is water or washing oil.

9. A tail gas absorption device for asphalt processing, characterized in that, The method for absorbing exhaust gas from asphalt processing as described in any one of claims 1-7 is adopted.

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