Device and method for collecting heavy metal particles in waste gas

Abstract

The invention relates to the technical field of heavy metal detection, and discloses a device and method for collecting heavy metal particles in waste gas, and the method comprises the following steps: introducing the waste gas into a detection area based on an induced draft fan, collecting the air inlet rate of unit time at the inlet of the induced draft fan, and starting a rotating assembly arranged in the detection area; the initial rotating speed of the rotating assembly is determined according to the air inlet amount, air flowing speeds at multiple positions in the detection area are collected, the distribution condition of waste gas in the detection area is judged according to the air flowing speeds, and whether the initial rotating speed is adjusted or not is judged according to the distribution condition; putting the bipolar electrostatic rod into a detection area, and determining the collection frequency of the bipolar electrostatic rod according to the particulate matter concentration in the detection area; the heavy metal concentration is obtained according to the content of multiple groups of heavy metal particles after collection. The problem that the detection precision is influenced by uneven airflow in a traditional method is solved, and the waste gas heavy metal particle collection efficiency and the detection accuracy are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of heavy metal detection, and in particular, to a device and method for collecting heavy metal particles in waste gas. Background Art

[0002] In recent years, the government and power plants have placed an increasing emphasis on qualitatively measuring the proportion of "green" energy. The production and combustion processes generate a large amount of waste gas, which usually contains various harmful substances, among which heavy metal particles are the most harmful category. Heavy metal particles not only cause serious environmental pollution but also pose a significant threat to human health through the respiratory system. Therefore, how to effectively collect and accurately detect heavy metal particles in waste gas is an important technical issue in the field of environmental monitoring.

[0003] Traditional methods for detecting heavy metal particles in waste gas mainly rely on technologies such as physical filtration, chemical analysis, and spectral analysis. Traditional filtration methods often have low collection efficiency when dealing with tiny and lightweight heavy metal particles. These particles are prone to escaping with the airflow, resulting in inaccurate monitoring data. When conducting chemical analysis and spectral analysis, it is usually guided by an induced draft fan, but the operation of the induced draft fan will cause changes in the airflow velocity and direction. This non-uniform flow state will affect the distribution of heavy metal particles in the detection area, thereby affecting the working efficiency and detection accuracy of the collection device. For devices based on the principle of electrostatic deposition, temperature changes in the waste gas will also affect the working performance of the detection device. Temperature changes will change the charge capture efficiency of the electrostatic rod, resulting in the capture effect of particulate matter varying with temperature fluctuations.

[0004] Therefore, there is an urgent need for a device and method for collecting heavy metal particles in waste gas to solve the problems existing in the current technology. Summary of the Invention

[0005] In view of this, the present invention proposes a device and method for collecting heavy metal particles in waste gas, aiming to solve the problems of low collection accuracy of heavy metal particles and unrepresentative collected samples in the current waste gas heavy metal detection technology, which affect the detection quality.

[0006] The present invention proposes a method for collecting heavy metal particles in waste gas, including: Introducing waste gas into the detection area based on an induced draft fan, collecting the air intake volume per unit time at the inlet of the induced draft fan, and starting a rotating component arranged in the detection area; Determining the initial rotation speed of the rotating component according to the air intake volume, collecting the air flow velocities at several locations in the detection area, judging the distribution condition of the waste gas in the detection area according to the air flow velocities, and judging whether to adjust the initial rotation speed according to the distribution condition; Place the bipolar electrostatic rod into the detection area, and determine the collection frequency of the bipolar electrostatic rod according to the particulate matter concentration in the detection area; After collection, obtain the heavy metal concentration based on the heavy metal particulate matter content of multiple groups.

[0007] Further, the initial rotation speed is calculated by the following formula: ; where S represents the initial rotation speed, represents the flow rate adjustment coefficient, 0.5 ≤ ≤ 2, Q represents the air inflow volume per unit time at the inlet of the induced draft fan, V represents the volume of the detection area, represents the density of the waste gas, represents the dynamic viscosity of the waste gas, a and b represent the weight coefficients, and a + b = 1.

[0008] Further, when judging the distribution status of the waste gas in the detection area according to the air flow velocity, it includes: Arrange a number of wind speed sensors in the detection area, collect the air flow velocity data of the wind speed sensors, establish a velocity data set, and obtain the uniformity coefficient according to the velocity data set, and judge the distribution status of the waste gas in the detection area according to the uniformity coefficient; The uniformity coefficient is calculated by the following formula: ; ; ; where, represents the uniformity coefficient, represents the deviation of the air flow velocity in the detection area, represents the average air flow velocity in the detection area; N represents the number of wind speed sensors, and Fi represents the air flow velocity data collected by the i-th wind speed sensor.

[0009] Further, when judging the distribution status of the waste gas in the detection area according to the uniformity coefficient, it includes: When the uniformity coefficient Cj is greater than or equal to 0.1, it is determined that the distribution of the waste gas in the detection area is uneven, and the initial rotation speed is adjusted, and the detection is carried out at the adjusted rotation speed; When the uniformity coefficient Cj is less than 0.1, it is determined that the distribution of the waste gas in the detection area is uniform, and the initial rotation speed is not adjusted, and the detection is carried out at the initial rotation speed.

[0010] Further, when it is determined to adjust the initial rotation speed, it includes: Obtain the difference in uniformity coefficient, where the difference in uniformity coefficient is the difference between the uniformity coefficient and the threshold value of 0.1. Compare the difference in uniformity coefficient with a preset first preset difference and a second preset difference respectively. The first preset difference is less than the second preset difference. Select an adjustment coefficient according to the comparison result to adjust the initial rotation speed, and obtain the adjusted rotation speed; When the difference in uniformity coefficient is less than or equal to the first preset difference, determine the first adjustment coefficient to adjust the initial rotation speed; When the difference in uniformity coefficient is greater than the first preset difference and less than or equal to the second preset difference, determine the second adjustment coefficient to adjust the initial rotation speed; When the difference in uniformity coefficient is greater than the second preset difference, determine the third adjustment coefficient to adjust the initial rotation speed; Among them, the first adjustment coefficient is less than the second adjustment coefficient, the second adjustment coefficient is less than the third adjustment coefficient, and the first adjustment coefficient is greater than 1, and the third adjustment coefficient is less than 1.2.

[0011] Further, when determining the collection frequency of the bipolar electrostatic rod according to the particulate matter concentration in the detection area, it includes: Compare the particulate matter concentration with a preset first preset particulate matter concentration and a second preset particulate matter concentration respectively. The first preset particulate matter concentration is less than the second preset particulate matter concentration. Determine the collection frequency of the bipolar electrostatic rod according to the comparison result; Under the first comparison result, determine the collection frequency of the bipolar electrostatic rod as the first preset collection frequency; Under the second comparison result, determine the collection frequency of the bipolar electrostatic rod as the second preset collection frequency; Under the third comparison result, determine the collection frequency of the bipolar electrostatic rod as the third preset collection frequency; Among them, the first comparison result is that the particulate matter concentration is less than or equal to the first preset particulate matter concentration, the second comparison result is that the particulate matter concentration is greater than the first preset particulate matter concentration and less than or equal to the second preset particulate matter concentration, the third comparison result is that the particulate matter concentration is greater than the second preset particulate matter concentration, the first preset collection frequency is greater than the second preset collection frequency, and the second preset collection frequency is greater than the third preset collection frequency.

[0012] Further, when obtaining the heavy metal concentration according to the heavy metal particulate matter content in multiple groups after collection, it includes: The heavy metal concentration is calculated by the following formula: ; Among them, Gn represents the heavy metal concentration, Gi represents the content of the i-th heavy metal particulate matter, Ti represents the temperature at the i-th collection, Ty represents the standard temperature, β represents the temperature influence coefficient, M represents the average mass of a single heavy metal particle, and V represents the area of the detection region.

[0013] Compared with the prior art, the beneficial effects of the present invention are as follows: The exhaust gas is introduced into the detection region by an induced draft fan, the air intake volume data is collected in real time, and the rotating assembly arranged in the detection region is started to ensure that the exhaust gas can maintain a relatively uniform flow state when entering the detection region. According to the air intake volume, the initial rotation speed of the rotating assembly is determined, so that the flow rate and direction of the exhaust gas are optimized and controlled in the detection region, avoiding the problem of uneven distribution of heavy metal particles caused by changes in the air flow rate and direction. The flow velocity data at various locations is collected to judge the distribution status of the exhaust gas in the detection region in real time, and the speed and direction of the rotating assembly are dynamically adjusted accordingly. Further ensure that the heavy metal particles in the exhaust gas are evenly distributed in the detection region, improving the collection efficiency of the electrostatic rod and the accuracy of detection. The electrostatic rod effectively captures the heavy metal particles in the exhaust gas by using electrostatic force, and can flexibly adjust the collection frequency of the electrostatic rod according to the particulate matter concentration detected in real time. Ensure efficient capture of heavy metal particles. In the final calculation of the heavy metal concentration, by collecting multiple groups of heavy metal particulate matter content data and conducting comprehensive analysis, the random errors and fluctuations that may exist in a single collection process are reduced.

[0014] On the other hand, the present application also provides a device for collecting heavy metal particles in exhaust gas for applying the above method for collecting heavy metal particles in exhaust gas, including: An induced draft fan for introducing the exhaust gas into the detection region; A rotating assembly arranged in the detection region, the rotation direction of the rotating assembly being perpendicular to the air intake direction of the induced draft fan; A sensor assembly including a first air intake sensor, a plurality of air velocity sensors, a dust concentration sensor, and a temperature sensor; A control device electrically connected to the induced draft fan, the rotating assembly, and the sensor assembly, the control device including a collection unit, a judgment unit, and a processing unit; The collection unit is configured to determine the initial rotation speed of the rotating assembly according to the air intake volume; The judgment unit is configured to collect the air flow velocities at several locations in the detection region, judge the distribution status of the exhaust gas in the detection region according to the air flow velocities, and judge whether to adjust the initial rotation speed according to the distribution status; The processing unit is configured to determine the collection frequency of the bipolar electrostatic rod according to the particulate matter concentration in the detection region, and obtain the heavy metal concentration according to multiple groups of heavy metal particulate matter contents after collection.

[0015] It is understood that the device and method for collecting heavy metal particles in waste gas provided by this application have the same beneficial effects, which will not be elaborated here. Description of the Drawings

[0016] By reading the following detailed description of the preferred embodiments, various other advantages and benefits will become clear to those of ordinary skill in the art. The drawings are only for the purpose of showing the preferred embodiments and are not considered to be a limitation of the present invention. Moreover, throughout the drawings, the same reference numerals are used to represent the same components. In the drawings: Figure 1 is a flowchart of the method for collecting heavy metal particles in waste gas provided by an embodiment of the present invention; Figure 2 is a structural block diagram of the device for collecting heavy metal particles in waste gas provided by an embodiment of the present invention. Detailed Embodiments

[0017] The exemplary embodiments of the present disclosure will be described in more detail below with reference to the drawings. Although the exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided so that the present disclosure can be more thoroughly understood and the scope of the present disclosure can be fully conveyed to those skilled in the art. It should be noted that, without conflict, the embodiments in the present invention and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the drawings and in combination with the embodiments.

[0018] In some embodiments of the present application, referring to Figure 1 as shown, this embodiment provides a method for collecting heavy metal particles in waste gas, including: S100: Introduce the waste gas into the detection area based on an induced draft fan, collect the air intake volume per unit time at the inlet of the induced draft fan, and turn on the rotating assembly arranged in the detection area.

[0019] S200: Determine the initial rotation speed of the rotating assembly according to the air intake volume, collect the air flow velocities at several locations in the detection area, judge the distribution condition of the waste gas in the detection area according to the air flow velocities, and judge whether to adjust the initial rotation speed according to the distribution condition.

[0020] S300: Place the bipolar electrostatic rod in the detection area, and determine the collection frequency of the bipolar electrostatic rod according to the particle concentration in the detection area.

[0021] S400: Obtain the heavy metal concentration according to the content of multiple groups of heavy metal particles after collection.

[0022] It can be understood that in S100, the exhaust gas is introduced from the outside to a specific detection area by an induced draft fan, the air inflow rate data per unit time at the inlet of the induced draft fan is collected, and the rotating assembly arranged in the detection area is started. Ensure that the exhaust gas can be guided into the detection area, and preliminarily judge the air flow condition entering the detection area through the air inflow rate data. Start the rotating assembly to assist in controlling and regulating the flow state of the exhaust gas in the detection area, so that the air flow is as uniform and stable as possible. In S200, according to the collected air inflow rate data, the initial rotation speed of the rotating assembly is determined, the air flow velocity data is collected at several positions in the detection area by multiple sensors, these flow velocity data are analyzed, the distribution condition of the exhaust gas in the detection area is judged, and according to the analysis result, it is judged whether it is necessary to adjust the initial rotation speed of the rotating assembly to optimize the distribution of the exhaust gas. Reasonably set the initial speed of the rotating assembly through the air inflow rate, so that the exhaust gas flows evenly when entering the detection area, monitor the air flow distribution in the detection area in real time, and maintain the uniform distribution of the exhaust gas by dynamically adjusting the speed of the rotating assembly, improving the capture efficiency of the electrostatic rod. In S300, the bipolar electrostatic rod is placed in the detection area to capture heavy metal particles in the exhaust gas, and the collection frequency of the bipolar electrostatic rod is dynamically adjusted according to the particulate matter concentration data in the detection area. By real-time monitoring the particulate matter concentration, the collection frequency is flexibly adjusted. In S400, according to the collected multi-group heavy metal particulate matter content data, the concentration of heavy metals in the exhaust gas is calculated. Through the comprehensive processing of multi-group data, the random error in the single collection process is reduced.

[0023] In some embodiments of the present application, the initial rotation speed is obtained by calculation according to the following formula: ; where S represents the initial rotation speed, represents the flow velocity adjustment coefficient, 0.5 ≤ ≤ 2, Q represents the air inflow rate per unit time at the inlet of the induced draft fan, V represents the volume of the detection area, represents the density of the exhaust gas, represents the dynamic viscosity of the exhaust gas, a, b represent the weight coefficients, and a + b = 1.

[0024] Specifically, the consideration of the exhaust gas density and viscosity in the formula enhances the adaptability of the system in various complex environments, improves the overall operation stability and collection efficiency, and can still maintain stable operating performance when dealing with exhaust gases with different physical properties.

[0025] It can be understood that by calculating the initial rotation speed, the flow of the exhaust gas in the detection area is made more uniform and stable. The capture efficiency of heavy metal particles and the detection accuracy are improved, and the problem of inaccurate detection caused by changes in air flow and physical properties in the traditional method is overcome.

[0026] In some embodiments of the present application, when judging the distribution of waste gas in the detection area according to the air flow velocity, it includes: arranging a plurality of wind speed sensors in the detection area, collecting the air flow velocity data of the wind speed sensors, establishing a velocity data set, and obtaining a uniformity coefficient according to the velocity data set, and judging the distribution of waste gas in the detection area according to the uniformity coefficient.

[0027] The uniformity coefficient is calculated by the following formula: ; ; ; Wherein, represents the uniformity coefficient, represents the deviation of the air flow velocity in the detection area, represents the average air flow velocity in the detection area. N represents the number of wind speed sensors, and Fi represents the air flow velocity data collected by the i-th wind speed sensor.

[0028] Specifically, the distribution of waste gas in the detection area is judged by the calculated uniformity coefficient. If the uniformity coefficient is low, it means that the waste gas distribution is relatively uniform. If the uniformity coefficient is high, the speed of the rotating component needs to be adjusted to improve the distribution uniformity of the waste gas.

[0029] It can be understood that by arranging a plurality of wind speed sensors and using the uniformity coefficient to quantify and evaluate the distribution of waste gas in the detection area, the areas with uneven flow can be accurately identified. It is beneficial to the refined management and optimization of the waste gas distribution. The uniformity coefficient provides an objective measurement standard to help judge in real time whether the speed of the rotating component needs to be adjusted. According to the calculated uniformity coefficient, the rotation speed can be automatically or manually adjusted to ensure the continuous uniformity of the waste gas distribution, thereby improving the collection efficiency and detection accuracy of the electrostatic rod. Even under complex and changing flow conditions, through precise flow velocity monitoring and uniformity evaluation, efficient and accurate heavy metal particle collection and detection can be maintained, which is beneficial to adapting to different waste gas characteristics and operating environments In some embodiments of the present application, when judging the distribution of waste gas in the detection area according to the uniformity coefficient, it includes: when the uniformity coefficient Cj is greater than or equal to 0.1, it is determined that the distribution of waste gas in the detection area is uneven, and the initial rotation speed is adjusted, and the detection is carried out at the adjusted rotation speed. When the uniformity coefficient Cj is less than 0.1, it is determined that the distribution of waste gas in the detection area is uniform, and the initial rotation speed is not adjusted, and the detection is carried out at the initial rotation speed.

[0030] In some embodiments of the present application, when it is determined to adjust the initial rotation speed, it includes: obtaining the difference in uniformity coefficient, where the difference in uniformity coefficient is the difference between the uniformity coefficient and the threshold value of 0.1, comparing the difference in uniformity coefficient with a preset first preset difference and a second preset difference respectively, the first preset difference is less than the second preset difference, selecting an adjustment coefficient according to the comparison result to adjust the initial rotation speed, and obtaining the adjusted rotation speed.

[0031] Specifically, when the difference in uniformity coefficient is less than or equal to the first preset difference, determine the first adjustment coefficient to adjust the initial rotation speed. When the difference in uniformity coefficient is greater than the first preset difference and less than or equal to the second preset difference, determine the second adjustment coefficient to adjust the initial rotation speed. When the difference in uniformity coefficient is greater than the second preset difference, determine the third adjustment coefficient to adjust the initial rotation speed. Among them, the first adjustment coefficient is less than the second adjustment coefficient, the second adjustment coefficient is less than the third adjustment coefficient, and the first adjustment coefficient is greater than 1, and the third adjustment coefficient is less than 1.2.

[0032] It can be understood that by real-time monitoring the uniformity coefficient and automatically adjusting the rotation speed according to the size of the difference, the distribution state of the waste gas is automatically optimized during operation. The need for manual intervention is reduced, and the intelligent level and operation convenience of the system are improved. Dynamically adjusting the rotation speed can effectively cope with the problem of uneven flow of waste gas flow, thereby improving the collection efficiency and detection accuracy of heavy metal particles. By setting different adjustment coefficients, rapid response to different degrees of uniformity changes is achieved. Uniform waste gas distribution provides a stable working environment for collection devices such as electrostatic rods, avoiding the problem of reduced capture efficiency caused by uneven flow velocity. Ensures the reliability and repeatability of the detection results.

[0033] In some embodiments of the present application, when determining the collection frequency of the bipolar electrostatic rod according to the particulate matter concentration in the detection area, it includes: comparing the particulate matter concentration with a preset first preset particulate matter concentration and a second preset particulate matter concentration respectively, the first preset particulate matter concentration is less than the second preset particulate matter concentration, and determining the collection frequency of the bipolar electrostatic rod according to the comparison result.

[0034] Specifically, under the first comparison result, the collection frequency of the bipolar electrostatic rod is determined as the first preset collection frequency. Under the second comparison result, the collection frequency of the bipolar electrostatic rod is determined as the second preset collection frequency. Under the third comparison result, the collection frequency of the bipolar electrostatic rod is determined as the third preset collection frequency. Among them, the first comparison result is that the particulate matter concentration is less than or equal to the first preset particulate matter concentration, the second comparison result is that the particulate matter concentration is greater than the first preset particulate matter concentration and less than or equal to the second preset particulate matter concentration, the third comparison result is that the particulate matter concentration is greater than the second preset particulate matter concentration, the first preset collection frequency is greater than the second preset collection frequency, and the second preset collection frequency is greater than the third preset collection frequency.

[0035] It can be understood that by adjusting the collection frequency in real time, it is possible to adapt to exhaust gas environments with different concentration levels. Regardless of how the particulate matter concentration in the exhaust gas changes, the working frequency of the electrostatic rod can be quickly adjusted to ensure the maximization of the collection efficiency. In the case of high concentrations, reducing the collection frequency can prevent the electrostatic rod from being overly saturated, thereby improving the capture efficiency. In the case of low concentrations, increasing the collection frequency can ensure that sufficient samples are captured, providing more accurate heavy metal concentration data.

[0036] In some embodiments of the present application, when obtaining the heavy metal concentration based on the heavy metal particulate matter content of multiple groups after collection, it includes: the heavy metal concentration is calculated by the following formula: ; where Gn represents the heavy metal concentration, Gi represents the content of the i-th heavy metal particulate matter, Ti represents the temperature at the i-th collection, Ty represents the standard temperature, β represents the temperature influence coefficient, M represents the average mass of a single heavy metal particle, and V represents the detection area.

[0037] Specifically, the core of the formula is to correct the heavy metal particulate matter content collected each time according to the difference between the temperature at the time of collection and the standard temperature, so as to correct the influence of temperature on the collection result. By dividing by the temperature adjustment coefficient, the amount of particulate matter collected at different temperatures is adjusted. The sum of the corrected particulate matter contents is divided by the volume of the detection area, and considering the average mass of a single heavy metal particle, the heavy metal concentration after temperature correction is finally obtained.

[0038] It can be understood that the temperature correction formula effectively eliminates the interference of temperature fluctuations on the collection and detection results of heavy metal particles. Even under different temperature conditions, the system can ensure the stability and reliability of the calculated results of heavy metal concentrations through the temperature correction mechanism. The temperature correction mechanism reduces the strict control requirements for the environmental temperature of the detection area, reduces the complexity of equipment and operations, and makes the system easier to operate and maintain.

[0039] In the above embodiments, the exhaust gas is introduced into the detection area by an induced draft fan, the air intake volume data is collected in real time, and the rotating assembly arranged in the detection area is started to ensure that the exhaust gas can maintain a relatively uniform flow state when entering the detection area. According to the air intake volume, the initial rotation speed of the rotating assembly is determined, so that the flow velocity and direction of the exhaust gas are optimized and controlled in the detection area, avoiding the problem of uneven distribution of heavy metal particles caused by changes in the air flow velocity and direction. The flow velocity data at various locations is collected to judge the distribution status of the exhaust gas in the detection area in real time, and the speed and direction of the rotating assembly are dynamically adjusted accordingly. Further ensure that the heavy metal particles in the exhaust gas are evenly distributed in the detection area, improving the collection efficiency of the electrostatic rod and the accuracy of detection. The electrostatic rod effectively captures heavy metal particles in the exhaust gas by using electrostatic force, and can flexibly adjust the collection frequency of the electrostatic rod according to the particulate matter concentration detected in real time. Ensure efficient capture of heavy metal particles. In the final heavy metal concentration calculation, by collecting multiple groups of heavy metal particulate matter content data and conducting comprehensive analysis, the random errors and fluctuations that may exist in a single collection process are reduced.

[0040] In another preferred embodiment based on the above embodiments, referring to Figure 2 as shown, this embodiment provides a device for collecting heavy metal particles in exhaust gas, which is used to apply the above method for collecting heavy metal particles in exhaust gas, and includes: An induced draft fan for introducing the exhaust gas into the detection area; A rotating assembly arranged in the detection area, and the rotation direction of the rotating assembly is perpendicular to the air intake direction of the induced draft fan; A sensor assembly including a first air intake sensor, several anemometers, a dust concentration sensor, and a temperature sensor; A control device electrically connected to the induced draft fan, the rotating assembly, and the sensor assembly, and the control device includes a collection unit, a judgment unit, and a processing unit; The collection unit is configured to determine the initial rotation speed of the rotating assembly according to the air intake volume; The judgment unit is configured to collect the air flow velocities at several locations in the detection area, judge the distribution status of the exhaust gas in the detection area according to the air flow velocities, and judge whether to adjust the initial rotation speed according to the distribution status; The processing unit is configured to determine the collection frequency of the bipolar electrostatic rod according to the particulate matter concentration in the detection area, and obtain the heavy metal concentration according to multiple groups of heavy metal particulate matter contents after collection.

[0041] It can be understood that the induced draft fan introduces the waste gas into the detection area through a pipeline. The detection area is an enclosed temporary storage area. The rotating assembly is arranged in the middle of the detection area. The rotating assembly disperses the waste gas introduced by the induced draft fan through rotation, so that the waste gas presents a free distribution state in the detection area. The wind speed sensors are evenly arranged in the detection area, and at least two wind speed sensors are provided. At the same time, a dust concentration sensor and a temperature sensor are also arranged in the detection area to detect the overall dust concentration and temperature data in the detection area.

[0042] It can be understood that in the above embodiment, the waste gas is introduced into the detection area through the induced draft fan, the air intake volume data is collected in real time, and the rotating assembly arranged in the detection area is started to ensure that the waste gas can maintain a relatively uniform flow state when entering the detection area. According to the air intake volume, the initial rotation speed of the rotating assembly is determined, so that the flow rate and direction of the waste gas are optimized and controlled in the detection area, avoiding the problem of uneven distribution of heavy metal particles caused by changes in the air flow speed and direction. The flow speed data at each place is collected to judge the distribution status of the waste gas in the detection area in real time, and the speed and direction of the rotating assembly are dynamically adjusted accordingly. Further ensure that the heavy metal particles in the waste gas are evenly distributed in the detection area, improving the collection efficiency of the electrostatic rod and the accuracy of detection. The electrostatic rod effectively captures the heavy metal particles in the waste gas by using electrostatic force, and can flexibly adjust the collection frequency of the electrostatic rod according to the particulate matter concentration detected in real time. Ensure efficient capture of heavy metal particles. In the final heavy metal concentration calculation, by collecting multiple groups of heavy metal particulate matter content data and conducting comprehensive analysis, the random errors and fluctuations that may exist in a single collection process are reduced.

[0043] Those skilled in the art should understand that the embodiments of the present application can be provided as a method, a system, or a computer program product. Therefore, the present application can take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware aspects. Moreover, the present application can take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0044] The present application is described with reference to the flowcharts and / or block diagrams of methods, apparatuses (systems), and computer program products according to the embodiments of the present application. It should be understood that each flow and / or block in the flowchart and / or block diagram can be implemented by computer program instructions, and the combination of flows and / or blocks in the flowchart and / or block diagram can also be implemented by computer program instructions. These computer program instructions can be provided to the processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing devices to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing devices generate for implementing in the process Figure 1 one process or multiple processes and / or blocksFigure 1 means for the functions specified in one or more boxes.

[0045] These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to operate in a particular manner, such that the instructions stored in the computer-readable memory produce a manufacture including an instruction means that implements the functions specified in one Figure 1 process or a plurality of processes and / or boxes Figure 1 or more boxes.

[0046] These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus, such that a series of operational steps are performed on the computer or other programmable apparatus to produce a computer-implemented process, whereby the instructions executed on the computer or other programmable apparatus provide steps for implementing the functions specified in one Figure 1 process or a plurality of processes and / or boxes Figure 1 or more boxes.

[0047] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them. Although the present invention has been described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: modifications or equivalent replacements can still be made to the specific embodiments of the present invention. Any modification or equivalent replacement that does not depart from the spirit and scope of the present invention shall be covered by the protection scope of the claims of the present invention.

Claims

1. A method for collecting heavy metal particles in exhaust gas, characterized in that: include: Based on the exhaust gas introduced into the detection area by the induced draft fan, the air intake volume per unit time at the inlet of the induced draft fan is collected and the rotating component arranged in the detection area is turned on; determining an initial rotation speed of the rotating component according to the air intake volume, collecting air flow speeds at several locations in the detection area, judging a distribution condition of exhaust gas in the detection area according to the air flow speeds, and judging whether to adjust the initial rotation speed according to the distribution condition; placing a bipolar electrostatic rod into the detection area, and determining the collection frequency of the bipolar electrostatic rod according to the concentration of particles in the detection area; After collection, the heavy metal concentration is obtained based on the contents of multiple groups of heavy metal particles.

2. The method for collecting heavy metal particles in exhaust gas according to claim 1, characterized in that: The initial rotation speed is calculated by the following formula: ； Where S represents the initial rotation speed, Indicates the flow rate adjustment coefficient, 0.5≤ ≤2, Q represents the air volume per unit time at the inlet of the induced draft fan, V represents the volume of the detection area, represents the density of exhaust gas, represents the dynamic viscosity of the exhaust gas, a and b represent weight coefficients, and a+b=1.

3. The method for collecting heavy metal particles in exhaust gas according to claim 1, characterized in that: When judging the distribution of the exhaust gas in the detection area according to the air flow velocity, it includes: Arrange a plurality of wind speed sensors in the detection area, collect air flow speed data from the wind speed sensors, establish a speed data set, obtain a uniformity coefficient according to the speed data set, and judge the distribution status of the exhaust gas in the detection area according to the uniformity coefficient; The uniformity coefficient is calculated by the following formula: ； ； ； in, represents the uniformity coefficient, Indicates the air flow velocity deviation in the detection area. represents the average air flow velocity in the detection area; N represents the number of wind speed sensors, and Fi represents the air flow velocity data collected by the i-th wind speed sensor.

4. The method for collecting heavy metal particles in exhaust gas according to claim 3, characterized in that: When judging the distribution status of the exhaust gas in the detection area according to the uniformity coefficient, it includes: When the uniformity coefficient Cj is greater than or equal to 0.1, it is determined that the exhaust gas is unevenly distributed in the detection area, the initial rotation speed is adjusted, and the detection is performed at the adjusted rotation speed; When the uniformity coefficient Cj is less than 0.1, it is determined that the exhaust gas is uniformly distributed in the detection area, and the initial rotation speed is not adjusted, and the detection is performed at the initial rotation speed.

5. The method for collecting heavy metal particles in exhaust gas according to claim 4, characterized in that: When determining to adjust the initial rotation speed, the method includes: Obtaining a uniformity coefficient difference, where the uniformity coefficient difference is a difference between the uniformity coefficient and a threshold value of 0.1, comparing the uniformity coefficient difference with a first preset difference and a second preset difference respectively, where the first preset difference is smaller than the second preset difference, and selecting an adjustment coefficient according to the comparison result to adjust the initial rotation speed, and obtaining an adjusted rotation speed; When the uniformity coefficient difference is less than or equal to a first preset difference, determining a first adjustment coefficient to adjust the initial rotation speed; When the uniformity coefficient difference is greater than a first preset difference and less than or equal to a second preset difference, determining a second adjustment coefficient to adjust the initial rotation speed; When the uniformity coefficient difference is greater than a second preset difference, determining a third adjustment coefficient to adjust the initial rotation speed; The first adjustment coefficient is smaller than the second adjustment coefficient, the second adjustment coefficient is smaller than the third adjustment coefficient, and the first adjustment coefficient is greater than 1, and the third adjustment coefficient is less than 1.

2.

6. The method for collecting heavy metal particles in exhaust gas according to claim 1, characterized in that: When the collection frequency of the bipolar electrostatic rod is determined according to the concentration of particles in the detection area, it includes: The particle concentration is compared with a first preset particle concentration and a second preset particle concentration respectively, the first preset particle concentration is less than the second preset particle concentration, and the collection frequency of the bipolar electrostatic rod is determined according to the comparison result; Under the first comparison result, determining the collection frequency of the bipolar electrostatic rod to be the first preset collection frequency; Under the second comparison result, determining the collection frequency of the bipolar electrostatic rod to be the second preset collection frequency; Under the third comparison result, determining the collection frequency of the bipolar electrostatic rod to be the third preset collection frequency; Among them, the first comparison result is that the particulate matter concentration is less than or equal to the first preset particulate matter concentration, the second comparison result is that the particulate matter concentration is greater than the first preset particulate matter concentration and less than or equal to the second preset particulate matter concentration, the third comparison result is that the particulate matter concentration is greater than the second preset particulate matter concentration, the first preset collection frequency is greater than the second preset collection frequency, and the second preset collection frequency is greater than the third preset collection frequency.

7. The method for collecting heavy metal particles in exhaust gas according to claim 1, characterized in that: After collection, the heavy metal concentration is obtained based on the content of multiple groups of heavy metal particles, including: The heavy metal concentration is calculated by the following formula: ； Wherein, Gn represents the heavy metal concentration, Gi represents the content of the i-th heavy metal particles, Ti represents the temperature at the time of the i-th collection, Ty represents the standard temperature, β represents the temperature influence coefficient, M represents the average mass of a single heavy metal particle, and V represents the area of ​​the detection area.

8. A device for collecting heavy metal particles in exhaust gas, used for applying the method for collecting heavy metal particles in exhaust gas according to any one of claims 1 to 7, characterized in that: include: An induced draft fan, used to introduce exhaust gas into the detection area; A rotating assembly is arranged in the detection area, and the rotating direction of the rotating assembly is perpendicular to the air inlet direction of the induced draft fan; A sensor assembly, including a first air inlet sensor, a plurality of wind speed sensors, a dust concentration sensor and a temperature sensor; A control device, electrically connected to the induced draft fan, the rotating assembly and the sensor assembly, the control device comprising a collection unit, a judgment unit and a processing unit; The collecting unit is configured to determine the initial rotation speed of the rotating component according to the air intake volume; The judgment unit is configured to collect air flow velocities at several locations in the detection area, judge the distribution of exhaust gas in the detection area according to the air flow velocities, and judge whether to adjust the initial rotation speed according to the distribution; The processing unit is configured to determine the collection frequency of the bipolar electrostatic rod according to the concentration of particulate matter in the detection area, and obtain the heavy metal concentration according to the content of multiple groups of heavy metal particulate matter after collection.

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