A method for tracing air pollutants using bubbles of different sizes and densities

Abstract

The application provides a method for tracing air pollutants by using bubbles with different sizes and densities, comprising the following steps: determining a target density value of a tracing bubble according to the density of a gaseous pollutant to be traced, or determining the target density value of the tracing bubble according to the aerodynamic diameter of a solid particle-shaped and droplet-form pollutant to be traced; preparing the tracing bubble with the target density value, and releasing the tracing bubble in air of a test area; collecting position information of the tracing bubble in the test area; and determining a motion direction, a motion trajectory and a motion speed of the tracing bubble in the test area according to the position information. The method for tracing air pollutants by using bubbles with different sizes and densities solves the problem of tracing particulate matters and gaseous pollutants carried in air.

Description

Technical Field

[0001] This invention relates to the field of environmental monitoring technology, and in particular to a method for tracing air pollutants using bubbles of different sizes and densities. Background Technology

[0002] Different types of pollutants exist in the air, including gaseous pollutants and fine particles, which impair indoor environmental quality and affect human health and industrial processes. However, the concentrations of these pollutants are relatively low, making them difficult to measure and observe, which limits research on the diffusion mechanisms of pollutants indoors.

[0003] Existing air tracing technologies use smoke or helium-filled bubbles to trace air. Smoke particles have a significant density difference from air, causing them to slip and affecting airflow in the measured area. While helium-filled bubbles have the same overall density as air and can effectively trace airflow, they are less effective at tracing particulate matter and gaseous pollutants carried in the air because exhaled particles have different diameters and different types of gaseous pollutants have varying densities.

[0004] Therefore, how to solve the problem of tracing particulate matter and gaseous pollutants carried in the air has become an important technical problem for those skilled in the art. Summary of the Invention

[0005] To address the problems existing in the prior art, embodiments of the present invention provide a method for tracing air pollutants using bubbles of different sizes and densities.

[0006] This invention provides a method for tracing air pollutants using bubbles of different sizes and densities, comprising:

[0007] The target density value of the tracer bubble is determined based on the density of the gaseous pollutant to be traced, or based on the aerodynamic diameter of the pollutant to be traced in the form of solid particles and droplets.

[0008] Prepare the tracer bubble with the target density value and release the tracer bubble into the air in the test area;

[0009] Collect the position information of the tracer bubble within the test area;

[0010] The direction, trajectory, and speed of the tracer bubble within the test area are determined based on the location information.

[0011] According to the present invention, a method for tracing air pollutants using bubbles of different sizes and densities, wherein determining the target density value of the tracer bubbles based on the aerodynamic diameter of the pollutants to be traced in the form of solid particles and droplets includes:

[0012] Determine the diameter of the tracer bubble;

[0013] The target density value of the tracer bubble is determined based on the aerodynamic diameter and the diameter of the tracer bubble.

[0014] According to the present invention, a method for tracing air pollutants using bubbles of different sizes and densities is provided, wherein determining the target density value of the tracer bubbles based on the density of the gaseous pollutant to be traced includes:

[0015] The density of the gaseous pollutant to be traced is directly used as the target density value of the tracer bubble.

[0016] According to the present invention, a method for tracing air pollutants using bubbles of different sizes and densities is provided, wherein the preparation of the tracer bubbles having the target density value includes:

[0017] Determine the thickness and density of the liquid film of the tracer bubble;

[0018] The density of the filling gas inside the tracer bubble is determined based on the target density value of the tracer bubble, the diameter of the tracer bubble, the thickness and density of the liquid film of the tracer bubble;

[0019] The tracer bubbles are prepared using a filling gas having the stated density value.

[0020] According to a method for tracing air pollutants using bubbles of different sizes and densities provided by the present invention, the step of preparing the tracer bubbles having the target density value further includes:

[0021] The composition of the filling gas is determined based on the density value.

[0022] According to the present invention, a method for tracing air pollutants using bubbles of different sizes and densities is provided, wherein the filling gas is a single-component gas or a mixture of gases having at least two components.

[0023] According to a method for tracing air pollutants using bubbles of different sizes and densities provided by the present invention, after preparing the tracer bubbles having the target density value, the method further includes:

[0024] The tracer bubbles that meet the target density value are selected.

[0025] According to the present invention, a method for tracing air pollutants using bubbles of different sizes and densities is provided, wherein the step of screening the tracer bubbles that meet the target density value includes:

[0026] The tracer bubble is transported to the test area using a transport medium, wherein the transport medium is a gas with the same density as the target density value.

[0027] According to the present invention, a method for tracing air pollutants using bubbles of different sizes and densities is provided, wherein the diameter of the tracer bubbles ranges from 1 to 3 millimeters.

[0028] According to a method for tracing air pollutants using bubbles of different sizes and densities provided by the present invention, determining the diameter of the tracer bubbles includes:

[0029] The diameter of the nozzle of the tracer bubble generator is determined based on the diameter range of the tracer bubble;

[0030] When the nozzle of the tracer bubble generator can continuously and stably generate bubbles, the diameter of the bubbles is the diameter of the tracer bubble.

[0031] The method for tracing air pollutants using bubbles of different sizes and densities provided by this invention determines a target density value for the tracer bubble based on the aerodynamic diameter or density of the pollutant to be traced, and then uses the tracer bubble with the target density value to trace the corresponding pollutant. Because the density or aerodynamic diameter of the tracer bubble matches the pollutant to be traced, the tracer bubble can effectively trace the pollutant, thereby solving the problem of tracing particulate matter and gaseous pollutants carried in the air. Attached Figure Description

[0032] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0033] Figure 1 This is a flowchart of the method for tracing air pollutants using bubbles of different sizes and densities provided by the present invention;

[0034] Figure 2 This is a flowchart provided by the present invention for determining the target density value of tracer bubbles when the pollutant to be traced is in the form of solid particles or droplets;

[0035] Figure 3 This is a flowchart for determining the diameter of a tracer bubble, provided by the present invention;

[0036] Figure 4 This is a flowchart for preparing tracer bubbles with a target density value, provided by the present invention. Detailed Implementation

[0037] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0038] The following is combined Figures 1 to 4 This invention describes a method for tracing air pollutants using bubbles of different sizes and densities, according to embodiments of the present invention.

[0039] Reference Figures 1 to 4 This invention provides a method for tracing air pollutants using bubbles of different sizes and densities, comprising the following steps:

[0040] Step 110: Determine the target density value of the tracer bubble based on the density of the gaseous pollutant to be traced, or determine the target density value of the tracer bubble based on the aerodynamic diameter of the pollutant to be traced in the form of solid particles and droplets.

[0041] Once the pollutant to be traced is selected, the state type of the pollutant is determined accordingly.

[0042] If the contaminant to be traced is in the form of solid particles or droplets, it has a definite diameter. Based on the diameter of the solid particles or droplets, the aerodynamic diameter of the contaminant can be calculated. Based on the aerodynamic diameter of the contaminant, the target density value of the tracer bubble can be calculated.

[0043] If the pollutant to be traced is a gas, it has a definite density. Based on the density of the pollutant, the target density value of the tracer bubble is determined.

[0044] Step 120: Prepare the tracer bubble with the target density value and release the tracer bubble into the air in the test area.

[0045] After determining the target density value of the tracer bubble in step 110, tracer bubbles are prepared according to the target density value, ensuring that the density of the tracer bubbles matches the target density value. The prepared tracer bubbles are then released into the air of the test area.

[0046] When the pollutant to be traced is in the form of solid particles or droplets, the aerodynamic diameter of the produced tracer bubble can be made to match the aerodynamic diameter of the pollutant. This avoids slippage and interference with airflow during the tracing process.

[0047] When the pollutant to be traced is a gas, the density of the tracer bubble produced can be made to match the density of the pollutant, thus effectively tracing the pollutant.

[0048] Step 130: Collect the position information of the tracer bubble within the test area.

[0049] The movement characteristics of the tracer bubble in the air of the test area are consistent with the movement characteristics of the pollutant to be traced in the air. The position information of the tracer bubble in the test area can represent the position information of the pollutant to be traced in the air under the same conditions.

[0050] In the specific data collection process, a camera can be set up in the test area to capture images of the tracer bubble's movement at different times.

[0051] At least two cameras should be set up, pointing at the test area from multiple angles, and ensuring that the measurement points within the test area can be captured by at least two cameras from different angles.

[0052] Step 140: Determine the movement direction, trajectory, and speed of the tracer bubble within the test area based on the location information.

[0053] The position of the tracer bubble in the image represents its location within the test area. The position information of the tracer bubble is extracted from images captured at various time points.

[0054] Based on the position information of the tracer bubble, the direction and trajectory of the tracer bubble's movement can be determined, that is, the direction and trajectory of the pollutant to be traced in the air.

[0055] Based on the trajectory of the tracer bubble and the time interval between camera shots, the speed of the tracer bubble can be calculated, that is, the speed of the pollutant to be traced in the air.

[0056] With this setup, the above method can be used to trace tiny pollutants in the air using visualized tracer bubbles, improving the visualization effect. Furthermore, since the density or aerodynamic diameter of the tracer bubble is consistent with the pollutant to be traced, the tracer bubble can effectively trace the pollutant, thus solving the problem of tracing particulate matter and pollutants carried in the air.

[0057] In this embodiment of the invention, when determining the target density value of the tracer bubble, if the pollutant to be traced is in a gaseous state, the density of the pollutant to be traced is directly used as the target density value of the tracer bubble.

[0058] If the pollutant to be traced is in the form of solid particles or droplets, the steps for determining the target density value of the tracer bubble based on the aerodynamic diameter of the pollutant in the form of solid particles or droplets specifically include:

[0059] Step 111: Determine the diameter of the tracer bubble.

[0060] The size of the tracer bubble should be small enough to be visualized; generally, tracer bubbles with a diameter of 1-3 mm are used for tracing.

[0061] The steps for determining the diameter of the tracer bubble specifically include:

[0062] Step 1111: Determine the diameter of the nozzle of the tracer bubble generator based on the diameter range of the tracer bubble.

[0063] Based on the general diameter range of the tracer bubble used, select the nozzle of the tracer bubble generator to ensure that the nozzle can generate tracer bubbles within that diameter range when the tracer bubble generator is working.

[0064] Step 1112: When the nozzle of the tracer bubble generator can continuously and stably generate bubbles, the diameter of the bubbles is the diameter of the tracer bubble.

[0065] Install the selected nozzle onto the tracer bubble generator and conduct a test. When the nozzle of the tracer bubble generator can continuously and stably generate bubbles, measure the actual diameter of the generated bubbles and take the measured actual diameter of the bubbles as the diameter of the tracer bubbles.

[0066] Step 112: Determine the target density value of the tracer bubble based on the aerodynamic diameter and the diameter of the tracer bubble.

[0067] Using formula (where d) a For the aerodynamic diameter, d e ρ is the diameter of the bubble. p ρ is the density of the bubble, ρ0 is the density of water, and χ is the proportionality coefficient. Based on the aerodynamic diameter of the pollutant to be traced and the diameter of the tracer bubble, the target density value of the tracer bubble can be calculated.

[0068] In this embodiment of the invention, the step of preparing the tracer bubble having the target density value specifically includes:

[0069] Step 121: Determine the thickness and density of the liquid film of the tracer bubble.

[0070] The liquid film of a tracer bubble is typically water, with a fixed thickness and a known density.

[0071] Step 122: Determine the density value of the filling gas inside the tracer bubble based on the target density value of the tracer bubble, the diameter of the tracer bubble, the thickness and density of the liquid film of the tracer bubble.

[0072] The tracer bubble is spherical, and the area inside the liquid film is filled with gas. The overall diameter and density of the tracer bubble, as well as the diameter of the tracer bubble and the thickness of the liquid film, are already determined, thus allowing us to obtain the diameter of the filling gas portion. Calculations can then be performed to determine the density of the filling gas.

[0073] Step 124: Prepare the tracer bubble using a filling gas having the stated density value.

[0074] After calculating the density value of the filling gas, tracer bubbles can be generated using a tracer bubble generator and a filling gas with the corresponding density value.

[0075] In this embodiment, the step of preparing the tracer bubble having the target density value further includes:

[0076] Step 123: Determine the composition of the filling gas based on the density value.

[0077] After calculating and determining the density value of the filling gas in step 122, the composition of the filling gas is selected and determined based on the density value.

[0078] The filling gas can be a single-component gas or a mixture of gases with at least two components. The content of each component in the gas mixture needs to be calculated and determined based on the density of each component and the density of the filling gas.

[0079] In this embodiment of the invention, after the tracer bubbles with the target density value are prepared, before releasing the tracer bubbles into the air in the test area, the tracer bubbles need to be screened. The tracer bubbles that meet the target density value are screened out and transported to the test area. The tracer bubbles that do not meet the target density value need to be prohibited from entering the test area.

[0080] In this embodiment, the step of selecting tracer bubbles that meet the target density value specifically includes:

[0081] The tracer bubble is transported to the test area using a transport medium, wherein the transport medium is a gas with the same density as the target density value.

[0082] In other words, tracer bubbles are generated using a tracer bubble generator and then transported via a conveying medium. The density of the conveying medium matches the target density value of the tracer bubbles. During transport, tracer bubbles with densities inconsistent with the conveying medium will spontaneously break down and dissipate, while those with densities consistent with the conveying medium will remain and be transported to the test area with the medium. By screening the density of the tracer bubbles, the consistency of their density is improved, which helps to improve the accuracy of the tracer results.

[0083] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for tracing air pollutants using bubbles of different sizes and densities, characterized in that, include: The target density value of the tracer bubble is determined based on the aerodynamic diameter of the pollutant to be traced, which is in the form of solid particles or droplets. Prepare the tracer bubble with the target density value and release the tracer bubble into the air in the test area; Collect the position information of the tracer bubble within the test area; The movement direction, trajectory, and speed of the tracer bubble within the test area are determined based on the location information. The determination of the target density value of the tracer bubble based on the aerodynamic diameter of the tracer pollutant in the form of solid particles and droplets includes: The diameter of the tracer bubble is determined to be in the range of 1-3 mm; The target density value of the tracer bubble is determined based on the aerodynamic diameter and the diameter of the tracer bubble; Determining the diameter of the tracer bubble includes: The diameter of the nozzle of the tracer bubble generator is determined based on the diameter range of the tracer bubble; When the nozzle of the tracer bubble generator can continuously and stably generate bubbles, the diameter of the bubbles is the diameter of the tracer bubble.

2. The method for tracing air pollutants using bubbles of different sizes and densities according to claim 1, characterized in that, The preparation of the tracer bubble having the target density value includes: Determine the thickness and density of the liquid film of the tracer bubble; The density of the filling gas inside the tracer bubble is determined based on the target density value of the tracer bubble, the diameter of the tracer bubble, the thickness and density of the liquid film of the tracer bubble; The tracer bubbles are prepared using a filling gas having the stated density value.

3. The method for tracing air pollutants using bubbles of different sizes and densities according to claim 2, characterized in that, The process of preparing the tracer bubble having the target density value further includes: The composition of the filling gas is determined based on the density value.

4. The method for tracing air pollutants using bubbles of different sizes and densities according to claim 3, characterized in that, The filling gas is a single-component gas, or a mixture of gases having at least two components.

5. The method for tracing air pollutants using bubbles of different sizes and densities according to claim 1, characterized in that, After preparing the tracer bubble with the target density value, the method further includes: The tracer bubbles that meet the target density value are selected.

6. The method for tracing air pollutants using bubbles of different sizes and densities according to claim 5, characterized in that, The process of filtering tracer bubbles that meet the target density value includes: The tracer bubble is transported to the test area using a transport medium, wherein the transport medium is a gas with the same density as the target density value.

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