CN-116068125-B - Method for tracing air pollutants by utilizing bubbles with different sizes and densities

CN116068125BCN 116068125 BCN116068125 BCN 116068125BCN-116068125-B

Abstract

The invention provides a method for tracing air pollutants by utilizing bubbles with different sizes and densities, which comprises the steps of determining a target density value of trace bubbles according to the density of gaseous pollutants to be traced, or determining the target density value of trace bubbles according to aerodynamic diameters of the pollutants to be traced in the form of solid particles and liquid drops, preparing the trace bubbles with the target density value, applying the trace bubbles in air of a test area, collecting position information of the trace bubbles in the test area, and determining the movement direction, movement track and movement speed of the trace bubbles in the test area according to the position information. The method for tracing the air pollutants by utilizing the bubbles with different sizes and densities solves the tracing problem of the particulate matters and the air pollutants carried in the air.

Inventors

WANG HUAN
LIAO YIFAN
DUAN MENGJIE
LI XIANTING

Assignees

清华大学

Dates

Publication Date: 20260512
Application Date: 20211102

Claims (6)

1. A method for tracking air pollutants with bubbles of varying size and density, comprising: Determining a target density value of the tracer bubble according to aerodynamic diameters of the pollutants to be traced in the form of solid particles and liquid drops; Preparing the trace bubbles with the target density value, and applying the trace bubbles in the air of a test area; Collecting position information of the trace bubbles in the test area; Determining the movement direction, movement track and movement speed of the trace bubble in the test area according to the position information; Said determining a target density value of the tracer bubble from the aerodynamic diameter of the contaminant to be traced in the form of solid particles and droplets comprises: Determining the diameter of the trace bubble, wherein the diameter of the trace bubble ranges from 1 millimeter to 3 millimeters; Determining a target density value of the tracer bubble according to the aerodynamic diameter and the diameter of the tracer bubble; the determining the diameter of the tracer bubble comprises: determining the diameter of a nozzle of a trace bubble generator according to the diameter range of the trace bubble; when the nozzle of the trace bubble generator can continuously and stably generate bubbles, the diameter of the bubbles is the diameter of the trace bubbles.
2. The method of tracking air pollutants with bubbles of varying size and density as set forth in claim 1, wherein said producing said tracked bubbles having said target density value includes: determining the thickness and density of the liquid film of the trace bubble; Determining a density value of the filling gas in the trace bubble according to the target density value of the trace bubble, the diameter of the trace bubble, the thickness and the density of the liquid film of the trace bubble; And preparing the trace bubble by using the filling gas with the density value.
3. The method of tracking air pollutants with bubbles of varying size and density as set forth in claim 2, wherein said producing said tracked bubbles having said target density value further includes: And determining the composition of the filling gas according to the density value.
4. A method of tracking air pollutants with bubbles of different size and density according to claim 3, characterised in that the filling gas is a single component gas or a gas mixture having at least two components.
5. The method of tracking air pollutants with bubbles of varying size and density as set forth in claim 1, further comprising, after said preparing said tracked bubbles having said target density value: screening the trace bubbles meeting the target density value.
6. The method of tracking air pollutants with bubbles of different sizes and densities according to claim 5, wherein said screening said tracked bubbles for compliance with said target density value comprises: and conveying the trace bubbles to the test area by using a conveying medium, wherein the conveying medium is gas with the density consistent with the target density value.

Description

Method for tracing air pollutants by utilizing bubbles with different sizes and densities Technical Field The invention relates to the technical field of environmental monitoring, in particular to a method for tracing air pollutants by utilizing bubbles with different sizes and densities. Background Different types of contaminants, including gaseous contaminants and small particles, exist in the air, which can impair the quality of the indoor environment and can have an impact on personnel health and process production. However, the concentration of these contaminants is relatively low and cannot be easily measured and observed by itself, limiting the relevant research on the mechanism of diffusion of the contaminants in the room. Existing air tracing techniques use smoke or bubbles filled with helium for air tracing. The smoke particles have larger difference with the air density, so that the smoke particles can slip, and the air flow of a detected area can be influenced to a certain extent. While helium filled bubbles have the same overall density as air, although they provide better flow of trace air, due to the different diameters of the particles exhaled by the person, the corresponding densities of different types of gaseous contaminants are not the same, resulting in less than better flow of trace air carried particulate matter and gaseous contaminants. Therefore, how to solve the tracing problem of the particulate matters and the gaseous pollutants carried in the air is an important technical problem to be solved by the person skilled in the art. Disclosure of Invention Aiming at the problems existing in the prior art, the embodiment of the invention provides a method for tracing air pollutants by utilizing bubbles with different sizes and densities. The invention provides a method for tracing air pollutants by utilizing bubbles with different sizes and densities, which comprises the following steps: Determining a target density value of the tracer bubble according to the density of the gaseous contaminant to be traced, or determining a target density value of the tracer bubble according to the aerodynamic diameter of the contaminant to be traced in the form of solid particles and liquid droplets; Preparing the trace bubbles with the target density value, and applying the trace bubbles in the air of a test area; Collecting position information of the trace bubbles in the test area; And determining the movement direction, movement track and movement speed of the trace bubble in the test area according to the position information. According to the present invention there is provided a method of tracing an air contaminant with bubbles of different sizes and densities, said determining a target density value of the traced bubbles from aerodynamic diameters of the contaminant to be traced in the form of solid particles and droplets, comprising: Determining the diameter of the trace bubble; And determining a target density value of the trace bubble according to the aerodynamic diameter and the diameter of the trace bubble. According to the method for tracing air pollutants by utilizing bubbles with different sizes and densities, the target density value of the traced bubbles is determined according to the density of the gaseous pollutants to be traced, and the method comprises the following steps: and directly taking the density of the gaseous pollutant to be tracked as a target density value of the tracking bubbles. According to the present invention there is provided a method of tracking air pollutants using bubbles of different sizes and densities, said producing said tracked bubbles having said target density value comprising: determining the thickness and density of the liquid film of the trace bubble; Determining a density value of the filling gas in the trace bubble according to the target density value of the trace bubble, the diameter of the trace bubble, the thickness and the density of the liquid film of the trace bubble; And preparing the trace bubble by using the filling gas with the density value. According to the method for tracing air pollutants by utilizing bubbles with different sizes and densities, the tracing bubbles with the target density value are prepared, and the method further comprises the following steps: And determining the composition of the filling gas according to the density value. According to the method for tracing air pollutants by utilizing bubbles with different sizes and densities, the filling gas is single-component gas or a gas mixture with at least two components. According to the method for tracing air pollutants by utilizing bubbles with different sizes and densities, after the tracing bubbles with the target density value are prepared, the method further comprises the following steps: screening the trace bubbles meeting the target density value. According to the method for tracing air pollutants by utilizing bubbles with different sizes and densities, the scree