Oil fume removal method and system based on electrostatic adsorption

Abstract

The application relates to an oil fume removal method and system based on electrostatic adsorption, and relates to the technical field of oil fume removal, and comprises the following steps: acquiring partition oil fume detection parameters; analyzing the partition oil fume detection parameters to generate partition basic voltages; analyzing the partition oil fume detection parameters and the partition basic voltages to generate space charge compensation voltages; calculating the sum of the partition basic voltages and the space charge compensation voltages to generate partition final voltages; and analyzing the partition final voltages to generate partition adjustment instructions and outputting the partition adjustment instructions; wherein the partition adjustment instructions represent controlling preset positive and negative ion generators in preset honeycomb partitions to charge oil fumes with the partition final voltages. The application has the effect of improving the oil fume particle removal rate.

Description

Technical Field

[0001] This application relates to the technical field of oil fume removal, and in particular to an oil fume removal method and system based on electrostatic adsorption. Background Technology

[0002] The core principle of electrostatic adsorption for capturing oil fume particles is to use a high-voltage electric field to charge the oil mist particles, and then use the physical property of opposite charges attracting each other to aggregate the oil mist particles into large oil droplets for collection and treatment.

[0003] In related technologies, a honeycomb structure is typically used to charge oil mist particles. Positive and negative ion generators are precisely arranged in a 1:1 ratio inside a regular hexagonal pipe. The regular hexagonal pipe forms a high-density planar honeycomb tube structure. When the oil fume airflow passes through the planar honeycomb tube structure, the positive and negative ion generators generate an electrostatic field with a rated voltage to charge the oil mist particles, so that the oil mist particles carry positive and negative charges respectively. Under the action of electric field force and airflow, the oil mist particles carrying positive and negative charges attract and collide with each other, thereby aggregating into large-diameter oil droplets. Finally, under the action of gravity, they fall into a detachable oil collection box for treatment.

[0004] Regarding the aforementioned technologies, positive and negative ion generators use rated voltage to generate an electrostatic field to charge oil mist particles. When the oil fume concentration increases instantaneously, a large number of oil mist particles rush into the electrostatic field of the evaporation ion generator, easily exceeding the upper limit of the electrostatic field's charge, causing the electrostatic field to become saturated. At this time, the uncharged oil mist particles escape with the oil fume airflow and cannot effectively aggregate to form large-diameter oil droplets, resulting in a low oil fume particle removal rate, and there is still room for improvement. Summary of the Invention

[0005] To improve the removal rate of oil fume particles, this application provides an oil fume removal method and system based on electrostatic adsorption.

[0006] Firstly, this application provides a method for removing oil fumes based on electrostatic adsorption, employing the following technical solution: Oil fume removal methods based on electrostatic adsorption include: Obtain the zoned oil fume detection parameters; The parameters for detecting kitchen fumes in different zones are analyzed to generate the basic voltage for each zone. The detection parameters of oil fume in different zones and the basic voltage of each zone are analyzed to generate a space charge compensation voltage. Calculate the sum of the partition base voltage and the space charge compensation voltage to generate the partition final voltage; The final voltage of the partition is analyzed to generate and output a partition adjustment command; the partition adjustment command indicates that the preset positive and negative ion generators in the preset cellular partition are charged with oil fumes by the final voltage of the partition.

[0007] Optionally, the step of analyzing the zoned oil fume detection parameters to generate the zoned baseline voltage includes: The particle size of oil fume, the density of oil droplets, the airflow velocity of oil fume, the mass concentration of oil fume, and the relative permittivity of oil droplets are determined based on the zoned oil fume detection parameters. The collision constraint efficiency is determined based on the mass concentration of oil fume detection. Based on the preset efficiency charge model, the collision constraint efficiency, oil fume particle detection particle size, oil droplet detection density, oil fume airflow velocity, and oil fume detection mass concentration are calculated to generate the efficiency constraint charge. The efficiency-constrained charge, the particle size of the oil fume particles, and the relative permittivity of the oil droplets were analyzed to generate the partitioned base voltage. The expression for the efficiency charge model is: ; In the formula, To constrain the charge amount for efficiency, For measuring the particle size of oil fume particles, For oil droplet detection density, The velocity of the oil fume airflow. For detecting the mass concentration of cooking fumes. For collision constraint efficiency, The preset aerodynamic viscosity, The preset Coulomb collision coefficient, The preset thickness of the honeycomb structure. This is the preset charging time constant.

[0008] Optionally, the steps of analyzing the efficiency-constrained charge, the detected particle size of the oil fume particles, and the relative permittivity of the oil droplets to generate the partitioned base voltage include: Based on the preset electric field charging model, the efficiency constraint charge, the detected particle size of oil fume particles, and the relative permittivity of oil droplets are calculated to generate the efficiency constraint electric field strength. The product of the efficiency constraint electric field strength and the preset electrode sidewall spacing is calculated to generate the average base voltage; The average base voltage is corrected to generate the zoned base voltage; The expression for the electric field charging model is: ; In the formula, To constrain the electric field strength for efficiency, To constrain the charge amount for efficiency, For measuring the particle size of oil fume particles, Let be the relative permittivity of the oil droplet. The vacuum dielectric constant is a preset value.

[0009] Optionally, the step of correcting the average base voltage to generate the zoned base voltage includes: The velocity of the oil fume airflow is calculated based on a preset positive ion correction model to generate a positive ion voltage correction coefficient. The velocity of the oil fume airflow is calculated based on a preset negative ion correction model to generate a negative ion voltage correction coefficient. The products of the positive ion voltage correction coefficient and the average base voltage, and the negative ion voltage correction coefficient and the average base voltage are calculated separately to generate the zoned positive ion voltage and the zoned negative ion voltage. Correlate the positive ion voltage and negative ion voltage of the partition to generate the partition base voltage; The expression for the positive ion correction model is: ; The expression for the negative ion correction model is: ; In the formula, This is the positive ion voltage correction factor. This is the negative ion voltage correction coefficient. The preset positive ion mobility, The preset negative ion mobility, The velocity of the oil fume airflow. This is the preset reference airflow velocity.

[0010] Optionally, the step of analyzing the zoned fume detection parameters and zoned baseline voltage to generate a space charge compensation voltage includes: The particle size, mass concentration, relative permittivity of oil droplets, and velocity of oil fume flow are determined based on the zoned oil fume detection parameters. Determine whether the concentration of detected oil fume meets the preset electric field distortion concentration threshold. If the conditions are met, the preset uncompensated voltage will be defined as the space charge compensation voltage. If the conditions are not met, the basic voltage of the zone, the mass concentration of oil fume detection, the particle size of oil fume particles, the relative permittivity of oil droplets, and the airflow velocity of oil fume will be analyzed to generate a space charge compensation voltage.

[0011] Optionally, the steps of analyzing the zoned base voltage, the mass concentration of oil fume detection, the particle size of oil fume, the relative permittivity of oil droplets, and the oil fume airflow velocity to generate a space charge compensation voltage include: The quantity concentration of oil fume is determined based on the particle size and mass concentration of oil fume. Based on the preset charge model, the partition base voltage, oil fume particle detection particle size, oil droplet relative permittivity and oil fume airflow velocity are calculated to generate the actual oil fume charge. The actual oil fume charge and the concentration of detected oil fumes are analyzed to generate a space charge compensation voltage. The expression for the charge model is: ; In the formula, This represents the actual amount of oil fume charge. For the zone's base voltage, For measuring the particle size of oil fume particles, Let be the relative permittivity of the oil droplet. The velocity of the oil fume airflow. The preset electrode sidewall spacing, The preset thickness of the honeycomb structure. The preset vacuum permittivity, This is the preset charging time constant.

[0012] Optionally, the step of analyzing the actual oil fume charge and the detected quantity concentration of oil fumes to generate a space charge compensation voltage includes: Determine the basic electric field strength of the zone based on the zone's basic voltage; Calculate the product of the actual oil fume charge and the detected oil fume concentration to generate the space charge density; The space charge density is calculated based on a pre-defined electric field location model to generate the outlet electric field strength variable. The basic electric field strength is substituted into the output electric field strength variable for solution to generate the space charge compensation voltage; The expression for the electric field position model is: ; In the formula, For the output electric field strength variable, The preset optimal electric field strength variable, space charge density, The preset vacuum permittivity, This is the preset thickness of the honeycomb structure.

[0013] Optionally, the step of analyzing the final voltage of the partition to generate and output partition adjustment instructions includes: Obtain historical voltage data for the partition; Calculate the absolute value of the difference between the final voltage of the partition and the historical voltage of the partition to generate the voltage regulation amount; Determine whether the voltage regulation amount meets the preset voltage regulation dead zone requirements; If the conditions are met, a partition adjustment command is generated and output based on the partition's historical voltage. If it does not meet the requirements, a partition adjustment command will be generated and output based on the final partition voltage.

[0014] Secondly, this application provides an oil fume removal system based on electrostatic adsorption, employing the following technical solution: An oil fume removal system based on electrostatic adsorption includes: The acquisition module is used to acquire the zoned oil fume detection parameters; A memory for storing a program for the electrostatic adsorption-based oil fume removal method as described in any of the preceding claims; The processor and the program in the memory can be loaded and executed by the processor to implement the oil fume removal method based on electrostatic adsorption as described in any of the above.

[0015] In summary, this application includes at least one of the following beneficial technical effects: 1. By analyzing the detection parameters of the zoned oil fume, the basic voltage of the zone that can effectively charge the oil fume in the zone can be determined, thereby increasing the upper limit of the charge of the positive and negative ion generators and ensuring that the electrostatic field generated by the positive and negative ion generators will not be saturated with adsorption. This will prevent the escape of oil fume particles that have not been charged in time, thereby improving the removal rate of oil fume particles. 2. By analyzing the zoned oil fume detection parameters and zoned base voltage, the space charge compensation voltage is obtained. The sum of the zoned base voltage and the space charge compensation voltage is calculated to compensate for the distortion of the electrostatic field after the oil fume particles are charged, thus obtaining the zoned final voltage and improving the accuracy of the zoned final voltage. 3. By combining the collision constraint efficiency with the efficiency charge model, the minimum charge required to meet the collision efficiency of oil fume is derived, i.e., the efficiency constraint charge. After analyzing the efficiency constraint charge, the detected particle size of oil fume particles, and the relative permittivity of oil droplets, the partition base voltage is obtained. This ensures that when the positive and negative ion generators generate an electrostatic field with the partition base voltage to charge the oil fume particles, the charge reaches the minimum charge required to meet the collision efficiency, thereby improving the removal rate of oil fume particles. Attached Figure Description

[0016] Figure 1 This is a flowchart of the oil fume removal method based on electrostatic adsorption in the embodiments of this application.

[0017] Figure 2 This is a flowchart of the steps in this application embodiment to analyze the zoned oil fume detection parameters to generate the zoned base voltage.

[0018] Figure 3This is a flowchart of the steps in this application embodiment to analyze the efficiency-constrained charge, the detected particle size of oil fume particles, and the relative permittivity of oil droplets to generate the partitioned base voltage.

[0019] Figure 4 This is a flowchart of the steps in this application embodiment to modify the average base voltage to generate the partition base voltage.

[0020] Figure 5 This is a flowchart of the steps in this application embodiment to analyze the zoned oil fume detection parameters and the zoned base voltage to generate a space charge compensation voltage.

[0021] Figure 6 This is a flowchart of the steps in this application embodiment to analyze the partition base voltage, oil fume detection mass concentration, oil fume particle detection particle size, oil droplet relative permittivity, and oil fume airflow velocity to generate a space charge compensation voltage.

[0022] Figure 7 This is a flowchart of the steps in this application embodiment to analyze the actual oil fume charge and the oil fume detection quantity concentration to generate a space charge compensation voltage.

[0023] Figure 8 This is a flowchart of the steps in this application embodiment to analyze the final voltage of the partition, generate partition adjustment instructions, and output them. Detailed Implementation

[0024] To make the purpose, technical solution, and advantages of this application clearer, the following description is provided in conjunction with the appendix. Figures 1 to 8 The present application will be further described in detail below with reference to embodiments. It should be understood that the specific embodiments described herein are for illustrative purposes only and are not intended to limit the scope of the application.

[0025] Reference Figure 1 This application discloses a method for removing oil fumes based on electrostatic adsorption, including the following steps: Step S100: Obtain the zoned oil fume detection parameters.

[0026] In the process of charging oil fume particles by generating an electrostatic field with a fixed voltage using positive and negative ion generators within the honeycomb structure, if a high concentration of oil fume floods into the honeycomb structure, the electrostatic field may not be able to charge all the oil fume particles in time. The oil fume particles then escape with the oil fume flow, and the uncharged oil fume particles cannot effectively collide and aggregate, thus failing to form large oil droplets that can be collected under gravity, resulting in a low removal rate of oil fume particles. To solve this problem, it is necessary to ensure that the electrostatic field of the honeycomb structure can effectively charge oil fume in different states. Therefore, it is necessary to detect the oil fume detection parameters of each zone, and then quantify the voltage required to effectively charge oil fume in that state based on the detection parameters. This ensures that all oil fume particles carry sufficient positive or negative ions, collide and aggregate after leaving the honeycomb structure, thereby improving the removal rate of oil fume particles.

[0027] The zoned oil fume detection parameters are parameters related to the charge of oil fume particles in different zones of the honeycomb structure. The honeycomb structure is divided into multiple sector regions, and the voltage of the positive and negative ion generators in different sector regions is adjusted independently to accommodate different oil fume distributions in different zones. The zoned oil fume detection parameters include oil fume particle detection size, oil droplet detection density, oil fume airflow velocity, oil fume detection mass concentration, and oil droplet relative permittivity.

[0028] The detected particle size of oil fume particles is the average particle size of oil fume particles within the zone. The initial particle size of oil fume particles is detected in real time by a laser particle size analyzer installed in the zone. The number of particles with the same initial particle size is counted, and the proportion of the number is calculated. The initial particle sizes are then weighted and summed using the proportion of the number as a weight to obtain the detected particle size of oil fume particles.

[0029] The oil droplet detection density is the mass density of the oil droplet, which is calculated by the operator using a liquid density meter to measure the density of the oil multiple times and then calculating the average value.

[0030] The velocity of the oil fume airflow is the velocity of the oil fume airflow within the zone. The initial value is obtained by real-time detection of the hot-wire anemometer installed at the zone entrance. The initial value is then processed by moving average filtering to obtain the oil fume airflow velocity. The oil fume airflow velocity can be used to quantify the time that oil fume particles spend in the electrostatic field.

[0031] The oil fume detection mass concentration is the oil fume concentration within the zone, that is, the total mass of oil fume contained in a unit volume of air within the zone. The initial value is obtained in real time by a laser scattering type oil fume concentration sensor installed at the zone entrance, and then the initial value is processed by moving average filtering to obtain the oil fume detection mass concentration.

[0032] The relative permittivity of an oil droplet is the ratio of the oil droplet's dielectric constant to the vacuum dielectric constant. It reflects the oil droplet's polarization ability and polarity. The larger the relative permittivity of an oil droplet, the more uneven the charge distribution inside the oil droplet, and the stronger its polarization response under an electrostatic field. It is obtained by the operator using a dielectric constant measuring instrument to measure the relative permittivity of the oil in an ideal environment and then calculating the average value.

[0033] Step S101: Analyze the zoned oil fume detection parameters to generate the zoned base voltage.

[0034] The partition base voltage is the voltage at which the partition charges the oil fume particles under ideal conditions. It includes the partition positive ion voltage and the partition negative ion voltage. This partition base voltage ensures that the positive and negative ion generators within the partition effectively charge the oil fume particles in their current state, guaranteeing that the collision and aggregation efficiency of the charged particles meets the minimum collection requirements. The partition positive ion voltage is the voltage at which the positive ion generator within the partition charges the oil fume particles, and the partition negative ion voltage is the voltage at which the negative ion generator within the partition charges the oil fume particles. These are obtained by the processing terminal after analyzing and calculating the partition oil fume detection parameters. The specific method is described in [reference needed]. Figure 2 The steps.

[0035] Step S102: Analyze the zoned oil fume detection parameters and zoned base voltage to generate space charge compensation voltage.

[0036] The space charge compensation voltage is the voltage required to compensate for the distortion of the electrostatic field caused by the electric field generated after the oil fume particles carry a charge. During the movement of the oil fume particles, the charge gradually increases. Once it reaches a certain level, the oil fume particles form an electric field, which distorts the electrostatic field. At this point, when the electrostatic field charges the oil fume particles, it cannot ensure that the charge of the oil fume particles reaches saturation. Therefore, it is necessary to compensate for the distorted electrostatic field. This compensation is obtained by the processing terminal after analyzing and calculating the zoned oil fume detection parameters and the zoned base voltage. Specific methods are described in [reference needed]. Figure 5 The steps.

[0037] Step S103: Calculate the sum of the partition base voltage and the space charge compensation voltage to generate the partition final voltage.

[0038] The final voltage of a zone is the actual voltage at which the positive and negative ion generators in that zone charge the oil fume particles. It includes the actual voltage of the zone's positive ions and the actual voltage of the zone's negative ions, and is obtained by the processing terminal by calculating the sum of the zone's base voltage and space charge compensation voltage.

[0039] Step S104: Analyze the final voltage of the partition to generate and output partition adjustment instructions.

[0040] The zoning adjustment command is a command to control the positive and negative ion generators within the cell zoning zone to charge the cooking fumes using the zone's final voltage. This is obtained by the processing terminal after analyzing the zone's final voltage. For specific methods, refer to [reference needed]. Figure 8 The steps.

[0041] Cellular partitioning refers to the fan-shaped areas obtained by uniformly dividing a high-density planar honeycomb tube structure composed of regular hexagonal pipes. The specific number of partitions is determined by the operator based on the actual situation.

[0042] The positive and negative ion generators are positioned along the axis of a regular hexagonal pipe in a honeycomb structure. The positive and negative ion generators are precisely arranged in a 1:1 ratio. When the oil fume airflow passes through the planar honeycomb pipe structure, the positive and negative ion generators generate an electrostatic field with the final voltage of the partition to charge the oil mist particles, so that the oil mist particles carry positive and negative charges respectively. Under the action of electric field force and airflow, the oil mist particles carrying positive and negative charges attract and collide with each other, thus aggregating into large-diameter oil droplets, which finally fall into the detachable oil collection box for treatment under the action of gravity.

[0043] Reference Figure 2 The steps for analyzing the zoned oil fume detection parameters to generate the zoned baseline voltage include: Step S200: Determine the particle size of oil fume, the density of oil droplets, the airflow velocity of oil fume, the mass concentration of oil fume, and the relative permittivity of oil droplets based on the zoned oil fume detection parameters.

[0044] In this step, the particle size of the oil fume particles, the density of the oil droplets, the velocity of the oil fume airflow, the mass concentration of the oil fume, and the relative permittivity of the oil droplets are consistent with those disclosed in step S100. They are obtained by the processing terminal from the data set corresponding to the zoned oil fume detection parameters according to actual usage requirements.

[0045] Step S201: Determine the collision constraint efficiency based on the detected mass concentration of oil fume.

[0046] The collision constraint efficiency is the minimum efficiency required for charged oil fume particles to collide and aggregate. This efficiency ensures that oil fume particles can effectively aggregate into large oil droplets for collection, significantly reducing oil fumes in the exhaust gas and meeting emission standards. The efficiency is determined by comparing the detected oil fume mass concentration with the set oil fume mass concentration threshold at the treatment terminal. If the concentration is less than the oil fume mass concentration threshold, the collision constraint efficiency is set to 95%; if it is greater, it is set to 98%, ensuring the removal effect of oil fumes.

[0047] The oil fume mass concentration threshold is the oil fume mass concentration that is used to classify collision constraint efficiency. When it is higher than this value, there are more oil fume particles. Even when the efficiency is low, a large number of particles are still emitted, so it is necessary to improve the collision constraint efficiency. When it is lower than this value, there are fewer oil fume particles. Maintaining a certain low efficiency can meet emission requirements while saving system energy consumption. The oil fume mass concentration threshold is determined by the operator through experiments with oil fume at step concentrations and efficiencies. When it is determined that the oil fume at a certain concentration cannot meet the emission standards at that efficiency, then that concentration is determined as the oil fume mass concentration threshold.

[0048] Step S202: Based on the preset efficiency charge model, calculate the collision constraint efficiency, oil fume particle detection particle size, oil droplet detection density, oil fume airflow velocity, and oil fume detection mass concentration to generate the efficiency constraint charge.

[0049] Among them, the efficiency charge model is the model for calculating the efficiency-constrained charge, and its specific expression is as follows: .

[0050] In the formula, To constrain the charge amount for efficiency, For measuring the particle size of oil fume particles, For oil droplet detection density, The velocity of the oil fume airflow. For detecting the mass concentration of cooking fumes. For collision constraint efficiency, The preset aerodynamic viscosity is denoted by , where is the viscous force coefficient within the air that hinders relative motion. For example, The preset Coulomb collision coefficient reflects the probability of Coulomb collisions between oil droplets carrying opposite charges. Taking 1.5 as an example, the operator uses a monodisperse oil droplet generator to produce oil droplets with a defined particle size and concentration. By adjusting different ionization voltages, the oil droplets are charged. Then, a laser particle size analyzer is used to detect the particle size distribution before and after aggregation, and the aggregation efficiency is calculated and fitted to obtain the result. The preset honeycomb structure thickness is determined by the operator based on actual conditions, with the minimum boundary being one-tenth of the maximum oil fume velocity to ensure that the oil fume remains in the electrostatic field for a sufficient time. The preset charging time constant, i.e., the time required for the oil droplet charge to reach 63.2% of its saturation charge, is determined by... Calculations show that The preset vacuum permittivity, The preset ion number density is determined by the performance of the positive and negative ion generators. It is the elementary charge, that is , The preset ion mobility is obtained by calculating the average value of the positive and negative ion mobility.

[0051] The efficiency-charge model is based on the collision-constrained efficiency to inversely derive the efficiency-constrained charge. The derivation process is as follows. Some parameters are eliminated during the derivation, so the reason for obtaining these parameters will not be explained further. The collision efficiency of oil fume particles carrying opposite charges is dominated by Coulomb collisions, and the expression is: In the formula, For actual collision efficiency, The amount of positive charge on the oil droplet. The amount of negative charge on the oil droplet is equal to the amount of negative charge on the oil droplet. The oil droplet number concentration is calculated by using the formulas for particle size and spherical volume to determine the oil droplet mass. Then, the quotient of the detected oil fume mass concentration and the oil droplet mass is calculated. The expression is: The exponent term in the formula This represents the probability that an oil droplet passes through the ionization region without a collision. Subtracting the exponent from 1 gives the probability of a collision. This represents the expected number of collisions within that time period, and the number of molecules... and The larger the value, the stronger the attraction and the more collisions. The larger the droplets, the more oil droplets there are, and the easier they are to collide. The larger the value, the longer the residence time, the greater the charge, and the greater the probability of collision, while the denominator contains... The larger the value, the greater the drag, and the lower the probability of a collision. The larger the value, the shorter the time, and the lower the probability of collision. The larger the value, the greater the mass, which in turn results in greater inertia. This makes it more difficult to change the trajectory and collide, thus lowering the probability of a collision.

[0052] The expression for the collision probability clearly shows that when the efficiency is not lower than the set efficiency, the oil droplet charge meets the minimum requirement for collision. Therefore, it is necessary to... ,and and They are equal, and the expression is: This reflects that the oil droplets gradually reach saturation charge in the ionization region. Therefore, the expression simplifies to After taking the natural logarithm of both sides and rearranging the terms, we get... After solving, we get .

[0053] The efficiency-constrained charge is the minimum charge required by oil fume particles, determined by the collision efficiency of the oil fume particles. It is calculated by the processing terminal by substituting the collision constraint efficiency, the detected particle size of oil fume particles, the detected oil droplet density, the oil fume airflow velocity, and the detected oil fume mass concentration into the efficiency charge model.

[0054] Step S203: Analyze the efficiency constraint charge, the detected particle size of oil fume particles, and the relative permittivity of oil droplets to generate the partition base voltage.

[0055] The partition base voltage in this step is the same as the partition base voltage in step S101. It is obtained by the processing terminal after analyzing and calculating the efficiency constraint charge, the detected particle size of oil fume particles, and the relative permittivity of oil droplets. The specific method is as follows: Figure 3 The steps.

[0056] Reference Figure 3 The steps for generating the partitioned base voltage include analyzing the efficiency-constrained charge, the particle size of the oil fume particles, and the relative permittivity of the oil droplets. Step S300: Based on the preset electric field charging model, calculate the efficiency constraint charge, the detected particle size of oil fume particles, and the relative permittivity of oil droplets to generate the efficiency constraint electric field strength.

[0057] The electric field charging model is used to calculate the efficiency-constrained electric field strength, and its specific expression is as follows: .

[0058] In the formula, To constrain the electric field strength for efficiency, To constrain the charge amount for efficiency, For measuring the particle size of oil fume particles, Let be the relative permittivity of the oil droplet. The vacuum dielectric constant is a preset value.

[0059] The electric field charge model is derived by inversely from the saturated charge model. The expression for the saturated charge model is: After rearranging the terms, we obtain the electric field charge model, while the saturated charge model reflects the maximum charge that a spherical particle can achieve under the action of an electrostatic field. The particle size and electric field strength directly affect the maximum charge; the larger the particle size, the more charge it can carry, and the greater the electric field strength, the more charge it can apply. The polarization factor quantifies the dielectric polarization capability of the oil droplet. The larger the polarization factor, the stronger the attraction of the induced charge of the oil droplet to the surrounding ions, and the more charge it can carry.

[0060] The efficiency constraint electric field strength is the electric field strength required to ensure that the oil fume particles carry the efficiency constraint charge. It is calculated by the processing terminal by substituting the efficiency constraint charge, the detected particle size of the oil fume particles, and the relative permittivity of the oil droplets into the electric field charging model.

[0061] Step S301: Calculate the product between the efficiency constraint electric field strength and the preset electrode sidewall spacing to generate the average base voltage.

[0062] The electrode sidewall spacing is the distance between the positive and negative ion generator and the honeycomb sidewall, which is actually measured by the operator.

[0063] The average base voltage is the ionization voltage determined without considering the difference in the mobility of positive and negative ions. It is obtained by calculating the product between the efficiency constraint electric field strength and the electrode sidewall spacing at the processing terminal.

[0064] Step S302: Correct the average base voltage to generate the zoned base voltage.

[0065] The partition base voltage in this step is the same as the partition base voltage in step S203. It is obtained by the processing terminal after correcting the average base voltage based on the difference in positive and negative ion mobility. The specific method is as follows: Figure 4 The steps.

[0066] Reference Figure 4 The steps for correcting the average base voltage to generate the zoned base voltage include: Step S400: Calculate the velocity of the oil fume airflow based on the preset positive ion correction model to generate a positive ion voltage correction coefficient.

[0067] Among them, the positive ion correction model is the model for calculating the positive ion voltage correction coefficient, and its specific expression is as follows: .

[0068] In the formula, This is the positive ion voltage correction factor. This is the negative ion voltage correction coefficient. The preset positive ion mobility is used to... For example, The preset negative ion mobility is used to... For example, The velocity of the oil fume airflow. The preset reference airflow velocity corresponds to the working condition where the oil droplet residence time is equal to the average time charge constant.

[0069] Because the mobility of negative ions is greater than that of positive ions, under the same voltage, the amount of negative charge carried by an oil droplet will be greater than the amount of positive charge carried by the droplet, leading to a decrease in collision efficiency. Therefore, to ensure that the two are consistent, the voltage for positive ions needs to be increased and the voltage for negative ions needs to be decreased to ensure that the charge is consistent. In the expression... Reflects the strength of the correction. Reflecting the necessity of revision, Reflecting the degree of influence of wind speed, at low wind speeds there is enough time to charge the battery, so the value approaches 0; at high wind speeds, the charging time is insufficient, so the value approaches 1.

[0070] The positive ion voltage correction coefficient is a coefficient used to compensate for the low positive ion mobility, which results in a low positive ion charge in oil droplets. It is calculated by substituting the oil fume gas flow velocity into the positive ion correction model at the processing terminal.

[0071] Step S401: Calculate the velocity of the oil fume airflow based on the preset negative ion correction model to generate a negative ion voltage correction coefficient.

[0072] The negative ion correction model is used to calculate the negative ion voltage correction coefficient, and its specific expression is as follows: .

[0073] In the formula, This is the positive ion voltage correction factor. This is the negative ion voltage correction coefficient. The preset positive ion mobility, The preset negative ion mobility, The velocity of the oil fume airflow. This is the preset reference airflow velocity.

[0074] The negative ion voltage correction coefficient is a suppression coefficient for negative ion voltage to ensure that the positive ion charge is equal to the negative ion charge. It is calculated by substituting the oil fume airflow velocity into the negative ion correction model at the processing terminal.

[0075] Step S402: Calculate the product of the positive ion voltage correction coefficient and the average base voltage, and the negative ion voltage correction coefficient and the average base voltage, respectively, to generate the zoned positive ion voltage and the zoned negative ion voltage.

[0076] In this step, the partitioned positive ion voltage and partitioned negative ion voltage are consistent with those disclosed in step S101. They are obtained by the processing terminal by calculating the product of the positive ion voltage correction coefficient and the average base voltage, and the negative ion voltage correction coefficient and the average base voltage, respectively. This increases the positive ion voltage and decreases the negative ion voltage, ensuring that the positive ion charge and the negative ion charge are equal, thus solving the problem that the positive and negative ion charges are different under the same voltage due to the difference in the mobility of positive and negative ions.

[0077] Step S403: Correlate the partition positive ion voltage and partition negative ion voltage to generate the partition base voltage.

[0078] In this process, after determining the positive ion voltage and negative ion voltage of the partition, the processing terminal arranges the positive ion voltage and negative ion voltage of the partition into a two-dimensional array in sequence to obtain the partition base voltage.

[0079] Reference Figure 5The steps for analyzing the zoned oil fume detection parameters and zoned baseline voltage to generate space charge compensation voltage include: Step S500: Determine the particle size of oil fume, the mass concentration of oil fume, the relative permittivity of oil droplets, and the airflow velocity of oil fume based on the zoned oil fume detection parameters.

[0080] In this step, the particle size, mass concentration, relative permittivity of oil droplets, and airflow velocity of the oil fume particles are the same as those disclosed in step S100. They are obtained by the processing terminal from the data set corresponding to the zoned oil fume detection parameters according to actual usage requirements.

[0081] Step S501: Determine whether the concentration of the detected oil fume meets the requirements of the preset electric field distortion concentration threshold.

[0082] The electric field distortion concentration threshold is the minimum concentration of cooking fumes that will cause distortion in the electrostatic field. Operators conduct experiments with gradient concentrations of cooking fumes, detecting the number of particles in the emitted gas. Once the number exceeds the threshold, that concentration is determined as the electric field distortion concentration threshold. The electric field distortion concentration threshold must not exceed the specified threshold value.

[0083] The processing terminal determines whether the concentration of detected oil fume is not greater than the electric field distortion concentration threshold, thereby determining whether the current oil fume concentration will cause electrostatic field distortion.

[0084] Step S5011: If the condition is met, the preset uncompensated voltage is defined as the space charge compensation voltage.

[0085] If the processing terminal determines that the mass concentration of the detected oil fume is not greater than the electric field distortion concentration threshold, it indicates that the number of oil fume particles is small and the electric field generated by the charge carried by the oil fume particles is insufficient to distort the electrostatic field. Therefore, voltage compensation is not required, and the uncompensated voltage is defined as the space charge compensation voltage.

[0086] Uncompensated voltage is the voltage value without voltage compensation, which is 0.

[0087] Step S5012: If not met, analyze the partition base voltage, oil fume detection mass concentration, oil fume particle detection particle size, oil droplet relative permittivity, and oil fume airflow velocity to generate a space charge compensation voltage.

[0088] If the processing terminal determines that the detected mass concentration of oil fume is greater than the electric field distortion concentration threshold, it indicates that the number of oil fume particles is large, and the electric field generated by the charge carried by the oil fume particles is sufficient to distort the electrostatic field. Therefore, voltage compensation is required. This involves analyzing and calculating the zoned base voltage, detected mass concentration of oil fume, detected particle size of oil fume, relative permittivity of oil droplets, and oil fume airflow velocity to obtain the space charge compensation voltage. The specific method is described in [reference needed]. Figure 6 The steps.

[0089] Reference Figure 6 The steps for generating a space charge compensation voltage include analyzing the zoned base voltage, the mass concentration of detected oil fumes, the particle size of detected oil fumes, the relative permittivity of oil droplets, and the airflow velocity of oil fumes. Step S600: Determine the quantity concentration of oil fume based on the particle size and mass concentration of oil fume.

[0090] Among them, the number concentration of oil fume detection refers to the number of oil fume particles contained in a unit volume of air, which is obtained by the processing terminal by substituting the oil fume particle detection particle size, oil droplet density, and oil fume detection mass concentration into the value. It was calculated in the middle.

[0091] Step S601: Based on the preset charge model, calculate the partition base voltage, oil fume particle detection particle size, oil droplet relative permittivity and oil fume airflow velocity to generate the actual oil fume charge.

[0092] The charge model is used to calculate the actual charge of cooking fumes, and its specific expression is as follows: .

[0093] In the formula, This represents the actual amount of oil fume charge. For the zone's base voltage, For measuring the particle size of oil fume particles, Let be the relative permittivity of the oil droplet. The velocity of the oil fume airflow. The preset electrode sidewall spacing, The preset thickness of the honeycomb structure. The preset vacuum permittivity, This is the preset charging time constant.

[0094] The charge of oil fume particles in the ionization region increases exponentially with time, approaching a saturation charge level. Describes the residence time as the quotient of the honeycomb structure thickness and the oil fume airflow velocity for the saturated charge of oil droplets under the partitioned base voltage. The proportionality coefficient describes the change of charge over time. The actual charge is determined by multiplying the proportionality coefficient by the saturated charge.

[0095] The actual oil fume charge is the actual charge of the oil fume under the current zone base voltage. It is calculated by the processing terminal by substituting the zone base voltage, the detected particle size of the oil fume particles, the relative permittivity of the oil droplets, and the oil fume airflow velocity into the charge model.

[0096] Step S602: Analyze the actual oil fume charge and the oil fume detection quantity concentration to generate a space charge compensation voltage.

[0097] The space charge compensation voltage in this step is the same as the space charge compensation voltage in step S5012. It is obtained by the processing terminal after analyzing and calculating the actual oil fume charge and the oil fume detection quantity concentration. The specific method is as follows: Figure 7 The steps.

[0098] Reference Figure 7 The steps for analyzing the actual oil fume charge and the concentration of detected oil fumes to generate a space charge compensation voltage include: Step S700: Determine the base electric field strength of the partition based on the partition base voltage.

[0099] Among them, the basic electric field strength of the zone is the electrostatic field strength generated by the positive and negative ion generators in the zone, which is obtained by the processing terminal by calculating the quotient of the basic voltage of the zone and the distance between the electrode sidewalls.

[0100] Step S701: Calculate the product of the actual oil fume charge and the detected oil fume concentration to generate the space charge density.

[0101] Among them, the space charge density is the amount of charge carried by all oil fume particles per unit volume, which is obtained by the product of the actual oil fume charge and the detected concentration of oil fume by the processing terminal.

[0102] Step S702: Calculate the space charge density based on the preset electric field location model to generate the outlet electric field strength variable.

[0103] The electric field location model is used to calculate the variable of the outlet electric field intensity, and its specific expression is as follows: .

[0104] In the formula, For the output electric field strength variable, The preset optimal electric field strength variable is an unknown. space charge density, The preset vacuum permittivity, This is the preset thickness of the honeycomb structure.

[0105] This model is based on the one-dimensional Poisson equation: the differential equation of electric field intensity with respect to electric field position is equal to the quotient of space charge density and vacuum permittivity. At the entrance of the ionization region, the space charge density is 0, therefore the actual electric field intensity equals the optimal electric field intensity variable. The one-dimensional Poisson equation is calculated from 0 to... Integrating the results yields the variable of the outlet electric field strength.

[0106] The outlet electric field strength variable is the electric field strength variable that should exist at the outlet of the ionization zone. The processing terminal substitutes the space charge density into the electric field position model to obtain an expression with only one unknown, which is the outlet electric field strength variable. The unknown is the optimal electric field strength variable, which is the compensated electric field strength. Under this electric field strength, even if the oil fume causes distortion to the electrostatic field, it can still ensure effective charging of oil fume particles.

[0107] Step S703: Substitute the basic electric field strength into the output electric field strength variable to solve for the space charge compensation voltage.

[0108] In this process, after determining the outlet electric field strength variable, the outlet electric field strength variable is made equal to the base electric field strength to ensure that the outlet electric field strength is equal to the base electric field strength, so that the oil fume particles are still effectively charged at the outlet. After solving for the optimal electric field strength variable, the product of the optimal electric field strength variable and the electrode sidewall distance is calculated to obtain the optimized voltage. Then, the difference between the optimized voltage and the zone base voltage is calculated to obtain the space charge compensation voltage.

[0109] Reference Figure 8 The steps for analyzing the final voltage of a partition to generate and output partition adjustment instructions include: Step S800: Obtain historical voltage of the partition.

[0110] Among them, the historical voltage of the partition is the voltage of the partition in the previous adjustment cycle, which is obtained by backing up the partition after calculating the final voltage of the partition in the previous cycle.

[0111] Step S801: Calculate the absolute value of the difference between the final voltage of the partition and the historical voltage of the partition to generate the voltage regulation amount.

[0112] Among them, the voltage adjustment amount is the adjustment amount between the voltage of the current cycle and the voltage of the previous cycle, which is obtained by the processing terminal calculating the absolute value of the difference between the final voltage of the partition and the historical voltage of the partition.

[0113] Step S802: Determine whether the voltage regulation amount meets the requirements of the preset voltage regulation dead zone.

[0114] The voltage regulation dead zone is the minimum voltage adjustment amount of the positive and negative ion generator. It is used to prevent frequent voltage adjustments caused by minor voltage fluctuations due to noise and oil fume concentration. Taking 50V as an example, the voltage regulation dead zone must not exceed the specified value.

[0115] The system processes the voltage regulation by determining whether the voltage adjustment amount is not greater than the voltage regulation dead zone, thereby determining whether voltage adjustment is necessary.

[0116] Step S8021: If the conditions are met, generate and output the partition adjustment command based on the partition's historical voltage.

[0117] If the processing terminal determines that the voltage adjustment amount is not greater than the voltage adjustment dead zone, it indicates that the voltage adjustment amount is small, which is very likely due to noise or slight fluctuations in oil fume concentration. Therefore, no voltage adjustment is required. After binding the historical voltage of the partition with the partition number, a partition adjustment command is generated and output.

[0118] Step S8022: If it does not meet the requirements, generate and output the partition adjustment command based on the final partition voltage.

[0119] If the processing terminal determines that the voltage adjustment amount is greater than the voltage adjustment dead zone, it indicates that the voltage adjustment amount is large and is caused by a sudden change in the oil fume concentration. Therefore, voltage adjustment is required. The final voltage of the partition is bound to the partition number to generate a partition adjustment command and output it.

[0120] Based on the same inventive concept, embodiments of this application provide an oil fume removal system based on electrostatic adsorption, comprising: The acquisition module is used to acquire the zone's oil fume detection parameters and the zone's historical voltage. A memory for storing programs for oil fume removal methods based on electrostatic adsorption; The processor can load and execute programs in memory to implement a method for removing oil fumes based on electrostatic adsorption.

[0121] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the above-described division of functional modules is used as an example. In practical applications, the above functions can be assigned to different functional modules as needed, that is, the internal structure of the device can be divided into different functional modules to complete all or part of the functions described above. The specific working process of the system, device, and unit described above can be referred to the corresponding process in the foregoing method embodiments, and will not be repeated here.

[0122] This application provides a computer-readable storage medium storing a computer program that can be loaded by a processor and executed as a method for removing oil fumes based on electrostatic adsorption.

[0123] Computer storage media include, for example, USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, optical disks, and other media that can store program code.

[0124] Based on the same inventive concept, embodiments of this application provide a smart terminal, including a memory and a processor, wherein the memory stores a computer program that can be loaded and executed by the processor for a method of removing oil fumes based on electrostatic adsorption.

[0125] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the above-described division of functional modules is used as an example. In practical applications, the above functions can be assigned to different functional modules as needed, that is, the internal structure of the device can be divided into different functional modules to complete all or part of the functions described above. The specific working process of the system, device, and unit described above can be referred to the corresponding process in the foregoing method embodiments, and will not be repeated here.

[0126] The above are all preferred embodiments of this application and are not intended to limit the scope of protection of this application. Any feature disclosed in this specification (including the abstract and drawings) may be replaced by other equivalent or similar features unless specifically stated otherwise. That is, unless specifically stated otherwise, each feature is only one example of a series of equivalent or similar features.

Claims

1. A method for removing oil fumes based on electrostatic adsorption, characterized in that, include: Obtain the zoned oil fume detection parameters; The parameters for detecting kitchen fumes in different zones are analyzed to generate the basic voltage for each zone. The detection parameters of oil fume in different zones and the basic voltage of each zone are analyzed to generate a space charge compensation voltage. Calculate the sum of the partition base voltage and the space charge compensation voltage to generate the partition final voltage; The final voltage of the partition is analyzed to generate and output partition adjustment instructions; The partition adjustment command indicates that the preset positive and negative ion generators in the preset cellular partition are controlled to charge the oil fumes with the final voltage of the partition. The steps for analyzing the zoned oil fume detection parameters to generate the zoned baseline voltage include: The particle size of oil fume, the density of oil droplets, the airflow velocity of oil fume, the mass concentration of oil fume, and the relative permittivity of oil droplets are determined based on the zoned oil fume detection parameters. The collision constraint efficiency is determined based on the mass concentration of oil fume detected. Based on the preset efficiency charge model, the collision constraint efficiency, oil fume particle detection particle size, oil droplet detection density, oil fume airflow velocity, and oil fume detection mass concentration are calculated to generate the efficiency constraint charge. The efficiency-constrained charge, the particle size of the oil fume particles, and the relative permittivity of the oil droplets were analyzed to generate the partitioned base voltage. The expression for the efficiency charge model is: ； In the formula, To constrain the charge amount for efficiency, For measuring the particle size of oil fume particles, For oil droplet detection density, The velocity of the oil fume airflow. For detecting the mass concentration of cooking fumes. For collision constraint efficiency, The preset aerodynamic viscosity, The preset Coulomb collision coefficient, The preset thickness of the honeycomb structure. The preset charging time constant; The steps for analyzing the zoned oil fume detection parameters and zoned baseline voltage to generate space charge compensation voltage include: The particle size, mass concentration, relative permittivity of oil droplets, and velocity of oil fume flow are determined based on the zoned oil fume detection parameters. Determine whether the concentration of detected oil fume meets the preset electric field distortion concentration threshold. If the conditions are met, the preset uncompensated voltage will be defined as the space charge compensation voltage. If the conditions are not met, the basic voltage of the zone, the mass concentration of oil fume detection, the particle size of oil fume particles, the relative permittivity of oil droplets, and the airflow velocity of oil fume will be analyzed to generate a space charge compensation voltage.

2. The method for removing oil fumes based on electrostatic adsorption according to claim 1, characterized in that, The steps for generating the partitioned base voltage include analyzing the efficiency-constrained charge, the particle size of the oil fume particles, and the relative permittivity of the oil droplets. Based on the preset electric field charging model, the efficiency constraint charge, the detected particle size of oil fume particles, and the relative permittivity of oil droplets are calculated to generate the efficiency constraint electric field strength. The product of the efficiency constraint electric field strength and the preset electrode sidewall spacing is calculated to generate the average base voltage; The average base voltage is corrected to generate the zoned base voltage; The expression for the electric field charging model is: ； In the formula, To constrain the electric field strength for efficiency, To constrain the charge amount for efficiency, For measuring the particle size of oil fume particles, Let be the relative permittivity of the oil droplet. The vacuum dielectric constant is a preset value.

3. The method for removing oil fumes based on electrostatic adsorption according to claim 2, characterized in that, The steps for correcting the average base voltage to generate the zoned base voltage include: The velocity of the oil fume airflow is calculated based on a preset positive ion correction model to generate a positive ion voltage correction coefficient. The velocity of the oil fume airflow is calculated based on a preset negative ion correction model to generate a negative ion voltage correction coefficient. The products of the positive ion voltage correction coefficient and the average base voltage, and the negative ion voltage correction coefficient and the average base voltage are calculated separately to generate the zoned positive ion voltage and the zoned negative ion voltage. Correlate the positive ion voltage and negative ion voltage of the partition to generate the partition base voltage; The expression for the positive ion correction model is: ； The expression for the negative ion correction model is: ； In the formula, This is the positive ion voltage correction factor. This is the negative ion voltage correction coefficient. The preset positive ion mobility, The preset negative ion mobility, The velocity of the oil fume airflow. This is the preset reference airflow velocity.

4. The method for removing oil fumes based on electrostatic adsorption according to claim 1, characterized in that, The steps for generating a space charge compensation voltage include analyzing the zoned base voltage, the mass concentration of detected oil fumes, the particle size of detected oil fume particles, the relative permittivity of oil droplets, and the airflow velocity of oil fumes: The quantity concentration of oil fume is determined based on the particle size and mass concentration of oil fume. Based on the preset charge model, the partition base voltage, oil fume particle detection particle size, oil droplet relative permittivity and oil fume airflow velocity are calculated to generate the actual oil fume charge. The actual oil fume charge and the concentration of detected oil fumes are analyzed to generate a space charge compensation voltage. The expression for the charge model is: ； In the formula, This represents the actual amount of oil fume charge. For the zone's base voltage, For measuring the particle size of oil fume particles, Let be the relative permittivity of the oil droplet. The velocity of the oil fume airflow. The preset electrode sidewall spacing, The preset thickness of the honeycomb structure. The preset vacuum permittivity, This is the preset charging time constant.

5. The method for removing oil fumes based on electrostatic adsorption according to claim 4, characterized in that, The steps for analyzing the actual oil fume charge and the detected quantity and concentration of oil fumes to generate a space charge compensation voltage include: Determine the basic electric field strength of the zone based on the zone's basic voltage; Calculate the product of the actual oil fume charge and the detected oil fume concentration to generate the space charge density; The space charge density is calculated based on a pre-defined electric field location model to generate the outlet electric field strength variable. The basic electric field strength is substituted into the output electric field strength variable for solution to generate the space charge compensation voltage; The expression for the electric field position model is: ； In the formula, For the output electric field strength variable, The preset optimal electric field strength variable, space charge density, The preset vacuum permittivity, This is the preset thickness of the honeycomb structure.

6. The method for removing oil fumes based on electrostatic adsorption according to claim 1, characterized in that, The steps for analyzing the final voltage of a partition to generate and output partition adjustment commands include: Obtain historical voltage data for the partition; Calculate the absolute value of the difference between the final voltage of the partition and the historical voltage of the partition to generate the voltage regulation amount; Determine whether the voltage regulation amount meets the preset voltage regulation dead zone requirements; If the conditions are met, a partition adjustment command is generated and output based on the partition's historical voltage. If it does not meet the requirements, a partition adjustment command will be generated and output based on the final partition voltage.

7. A fume removal system based on electrostatic adsorption, characterized in that, include: The acquisition module is used to acquire the zoned oil fume detection parameters; A memory for storing the program of the oil fume removal method based on electrostatic adsorption as described in any one of claims 1 to 6; The processor and the program in the memory can be loaded and executed by the processor to implement the oil fume removal method based on electrostatic adsorption as described in any one of claims 1 to 6.

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