CN115201071A - Air diffusion tracing method and system based on factory-bound malodor online monitoring system - Google Patents
Air diffusion tracing method and system based on factory-bound malodor online monitoring system Download PDFInfo
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- CN115201071A CN115201071A CN202211102031.9A CN202211102031A CN115201071A CN 115201071 A CN115201071 A CN 115201071A CN 202211102031 A CN202211102031 A CN 202211102031A CN 115201071 A CN115201071 A CN 115201071A
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- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N13/00—Investigating surface or boundary effects, e.g. wetting power; Investigating diffusion effects; Analysing materials by determining surface, boundary, or diffusion effects
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N13/00—Investigating surface or boundary effects, e.g. wetting power; Investigating diffusion effects; Analysing materials by determining surface, boundary, or diffusion effects
- G01N2013/003—Diffusion; diffusivity between liquids
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Abstract
The invention relates to an air diffusion tracing method and system based on a factory-bound malodor online monitoring system, wherein the method comprises the following steps: arranged in an odor monitoring areaNEach monitoring point; collecting malodorous gas pollutants and the concentration thereof monitored by each monitoring point, and simultaneously collecting meteorological information of each monitoring point; dividing malodorous gas pollutants monitored by all monitoring points into the malodorous gas pollutants according to a preset volume fractionNA tobacco mass; calculating according to the meteorological information to obtain a three-dimensional wind field, and then obtaining the motion track of each smoke group in the corresponding three-dimensional wind field; respectively calculating pollutant discharge amount corresponding to each smoke group according to the concentration of the malodorous gas pollutants and the wind speed in the meteorological information; overlapping pollutant discharge amount corresponding to each smoke group and a motion track in a three-dimensional wind field, and splicing according to preset volume fractions to obtain a pollutant diffusion distribution map; and positioning the position of the odor pollution source according to the pollutant diffusion distribution diagram. The inventionThe air diffusion tracing method has high tracing precision.
Description
Technical Field
The invention belongs to the technical field of atmospheric pollution monitoring, and particularly relates to an air diffusion tracing method and system based on a factory-bound malodor online monitoring system.
Background
The foul smell refers to any peculiar smell gas which stimulates olfactory organs to cause unpleasant feelings and damages the living environment. The source of the odor pollution is wide, the components are complex, various odor pollutants are mutually staggered and mutually influenced, and the monitoring difficulty is high. The on-line monitoring system for the factory malodors can simultaneously monitor various malodorous gases and the concentration of the malodorous gases in the air based on the characteristic spectrum absorption technology.
However, the existing malodor tracing model has the following disadvantages in inverting the pollution source distribution and concentration:
the traditional malodor empirical model generally assumes that the malodor pollution source is a constant, i.e., the pollution source is treated as a steady-state source; however, in actual malodorous contamination, there is a significant variation in the source of the contamination;
the (second) classical gaussian point source diffusion model is premised on "steady state" and represents only the average over a period of time. However, in practice, the classical gaussian model prediction is prone to errors due to the diffusion of odors being affected by complex or unsteady meteorological and topographical conditions.
Disclosure of Invention
Based on the above disadvantages and shortcomings in the prior art, it is an object of the present invention to at least solve one or more of the above problems in the prior art, in other words, to provide a method and system for tracing air diffusion based on a plant-wide malodor online monitoring system, which satisfies one or more of the above requirements.
In order to achieve the purpose of the invention, the invention adopts the following technical scheme:
an air diffusion tracing method based on a factory-bound malodor online monitoring system comprises the following steps:
s1, laying in an odor monitoring areaNAn on-line odor monitoring system for Taiwan factoryNEach monitoring point; wherein the content of the first and second substances,Nis an integer greater than 1;
collecting malodorous gas pollutants and the concentration thereof monitored by each monitoring point, and simultaneously collecting meteorological information of each monitoring point;
s2, dividing malodorous gas pollutants monitored by all monitoring points into a plurality of parts according to preset volume fractionsNIndividual cigarette groups; wherein each monitoring point corresponds to a smoke mass and the preset volume fraction is 1N；
Calculating according to the meteorological information of each monitoring point to obtain a three-dimensional wind field corresponding to each monitoring point;
s3, obtaining the motion trail of each smoke group in the corresponding three-dimensional wind field according to the Lagrange particle diffusion model;
respectively calculating pollutant discharge amount corresponding to each smoke group according to the concentration of the malodorous gas pollutants and the wind speed in the meteorological information;
s4, overlapping the pollutant discharge amount corresponding to each smoke mass and the motion trail in the three-dimensional wind field, and splicing according to a preset volume fraction to obtain a pollutant diffusion distribution map of the malodorous gas pollutants in the whole malodorous monitoring area in the atmosphere;
and S5, positioning the position of the odor pollution source according to the pollutant diffusion distribution map.
Preferably, the meteorological information further includes temperature, humidity, pressure and wind direction.
Preferably, in the step S3, the concentration of the malodorous gas pollutants monitored by the monitoring point corresponding to the wind speed less than 1.0m/SCPollutant discharge amount of smoke mass corresponding to the smoke massQThe relationship between them is:
wherein, the first and the second end of the pipe are connected with each other,
the downwind diffusion coefficient is the coefficient of diffusion,
is the diffusion coefficient of the side wind direction,
is a vertical diffusion coefficient of a gaussian equation,d a is the downwind component of the distance between the center of the smoke mass and the monitoring point,d c is the vertical component of the distance between the center of the plume and the monitoring point,Gis a vertical coefficient of a Gaussian equation,Hthe effective height of the center of the tobacco mass above the ground,his the height of the mixed layer.
Preferably, in step S3, the relationship between the concentration of the malodorous gas pollutants monitored by the monitoring point with the wind speed not less than 1.0m/S and the pollutant emission amount of the smoke mass corresponding to the concentration is as follows:
wherein the content of the first and second substances,j∈[1，N]，Q j is the wind speed of not less than 1.0m/sjThe pollutant discharge amount of the cigarette mass corresponding to each monitoring point after being superposed with the wind field,C j is as followsjThe concentration of malodorous gas pollutants monitored by each monitoring point,U j is a firstjAverage wind speed over a target time period at each monitoring point;
is as followsjAverage height of exhaust funnel in monitoring range of each monitoring point, if no exhaust funnel exists in monitoring range, then
The value is 1;αis a vertical diffusion coefficient of Gaussian equation
The exponent of (a) of (b),γis a vertical diffusion coefficient of Gaussian equation
Is/are as followsαCoefficient of order, i.e.
，x j Is as followsjThe actual radius of monitoring of the individual monitoring points,bis a constant term;
first, thejA monitoring point and the firstjAdjacent to 1 monitoring point.
As a preferred scheme, in the step S3, it is further determined whether the monitoring range of the monitoring point meets the condition of building washing; if yes, the vertical diffusion coefficient of the Gaussian equation is calculated according to the size of the building
Correcting; if not, the vertical diffusion coefficient of the Gaussian equation
And taking the value as the actual monitoring radius of the monitoring point.
Preferably, the conditions for washing the building are as follows:
wherein the content of the first and second substances,H q is the maximum height of the exhaust funnel in the monitoring range of the monitoring point,H b the height of the building within the monitoring range of the monitoring point,L b the smaller of the height and width of the building,T b is a building height constant coefficient.
Preferably, the above-mentionedT b The value is 0.5.
Preferably, the modifying the vertical diffusion coefficient of the gaussian equation according to the size of the building includes:
if it isH w /H b When the content of the organic acid is more than or equal to 5,
；
if the content is less than or equal to 1H w /H b When the ratio is less than 5, the reaction solution is,
；
if it isH w /H b When the ratio is less than 1, the reaction solution is,
；
H w in order to be the width of the building,H b is the height of the building and is,xis the actual monitoring radius of the monitoring point.
Preferably, in step S4, the pollutant diffusion profile is sharpened.
The invention also provides an air diffusion traceability system based on the plant-boundary malodor online monitoring system, which applies the air diffusion traceability method of any scheme, and the air diffusion traceability system comprises:
the collection module is used for collecting the malodorous gas pollutants and the concentration thereof monitored by each monitoring point and simultaneously collecting the meteorological information of each monitoring point;
a dividing module for dividing the malodorous gas pollutants monitored by all monitoring points into the malodorous gas pollutants according to a preset volume fractionNIndividual cigarette groups;
the calculation module is used for calculating to obtain a three-dimensional wind field corresponding to each monitoring point according to the meteorological information of each monitoring point;
the trajectory acquisition module is used for acquiring the motion trajectory of each smoke group in the corresponding three-dimensional wind field according to the Lagrange particle diffusion model;
the calculation module is also used for respectively calculating pollutant discharge amount corresponding to each smoke group according to the concentration of the malodorous gas pollutants and by combining the wind speed in the meteorological information;
the splicing module is used for superposing the pollutant discharge amount corresponding to each smoke mass and the motion trail in the three-dimensional wind field and splicing according to a preset volume fraction to obtain a pollutant diffusion distribution map of the malodorous gas pollutants in the whole malodorous monitoring area in the atmosphere;
and the positioning module is used for positioning the position of the odor pollution source according to the pollutant diffusion distribution diagram.
Compared with the prior art, the invention has the beneficial effects that:
(1) According to the invention, the cigarette groups are segmented, the pollutant discharge amount of each segmented cigarette group is calculated, and then the cigarette groups are overlapped and spliced with the motion tracks of the cigarette groups in the three-dimensional wind field to obtain the pollutant diffusion distribution map of the malodorous gas pollutants in the atmosphere in the whole malodorous monitoring area, so that the tracing of the malodorous pollution source is realized according to the pollutant diffusion distribution map, and the tracing precision is high;
(2) According to the method, the influence of the wind speed in the meteorological information on the diffusion distance of the malodorous gas pollutants and the concentration of the malodorous gas pollutants are integrated, the pollutant discharge amount corresponding to each smoke mass is obtained through calculation, the calculation precision of the pollutant discharge amount is improved, and the traceability precision is further improved;
(3) The invention considers the influence of building washing and further improves the tracing precision.
Drawings
FIG. 1 is a flow chart of an air diffusion tracing method based on a plant-wide malodor online monitoring system according to example 1 of the present invention;
FIG. 2 is a graph showing the influence of the diffusion distance of malodorous gas on the wind speed in example 1 of the present invention;
FIG. 3 is a graph showing the diffusion profile of contaminants before sharpening in accordance with example 1 of the present invention;
FIG. 4 is a graph of the diffusion profile of contaminants after sharpening in accordance with example 1 of the present invention;
fig. 5 is a structural diagram of an air diffusion traceability system based on a plant-wide malodor online monitoring system in example 1 of the present invention.
Detailed Description
In order to more clearly illustrate the embodiments of the present invention, the following description will explain the embodiments of the present invention with reference to the accompanying drawings. It is obvious that the drawings in the following description are only some examples of the invention, and that for a person skilled in the art, without inventive effort, other drawings and embodiments can be derived from them.
Example 1:
as shown in fig. 1, the air diffusion tracing method based on the factory-bound-malodor online monitoring system of the present embodiment includes the following steps:
s0, laying in an odor monitoring areaNAn on-line odor monitoring system for Taiwan factoryNEach monitoring point; wherein, the first and the second end of the pipe are connected with each other,Nis an integer greater than 1.
Specifically, a factory-bound odor online monitoring system is used for sampling malodorous gas generated in the industries of chemical industry, petroleum refining, pharmacy, coating, papermaking, food processing, essence and spice, sewage treatment, garbage landfill and the like, an ultraviolet absorption spectrum technology is used for generating a spectrum signal in a gas pool, a multi-component aliasing light absorption spectrum is subjected to single-component identification and differentiation through an iterative search optimal algorithm, and corresponding malodorous gas pollutants and the concentration thereof are inverted according to the Beer-Lambert law. The specific structure and detection principle of the factory-bound odor on-line monitoring system can refer to the prior art, and are not repeated herein.
S1, collecting malodorous gas pollutants and the concentration thereof monitored by each monitoring point, and simultaneously collecting meteorological information of each monitoring point through a meteorological station of each monitoring point.
Specifically, the meteorological information includes the five meteorological parameters, i.e., temperature, humidity, pressure, wind speed and wind direction, in order to simulate the diffusion and migration of malodorous gas pollutants according to meteorological conditions that vary over time and space.
S2, dividing malodorous gas pollutants monitored by all monitoring points into the malodorous gas pollutants according to a preset volume fractionNA tobacco mass; wherein each monitoring point corresponds to a cigarette mass with a preset volume fraction of 1-N；
And calculating according to the meteorological information of each monitoring point to obtain a three-dimensional wind field corresponding to each monitoring point.
In particular, dividedNThe individual lumps corresponding to the grid structure, e.g. 6X 6km 2 The grid corresponds to 36 smoke clusters. In addition, it belongs to the prior art to calculate and obtain the three-dimensional wind field corresponding to each monitoring point according to the meteorological information of each monitoring point, and details are not described herein.
S3, obtaining the motion trail of each smoke group in the corresponding three-dimensional wind field according to the Lagrange particle diffusion model; the lagrangian particle diffusion model belongs to the existing model and is not described herein.
In addition, pollutant discharge amount corresponding to each smoke group is calculated according to the concentration of the malodorous gas pollutants and the wind speed in meteorological information.
Specifically, taking a single monitoring point as an example, the corresponding smoke mass internal pollutant diffusion distribution formula is improved based on a two-dimensional Gaussian function, the diffusion coefficients of the smoke mass in the downwind direction and the crosswind direction are increased, and the influence of buildings (or undulating terrains with different heights) with different heights on the diffusion of the smoke mass is considered.
As shown in fig. 2, the influence of the wind speed on the diffusion distance of the malodorous gas pollutants is large, and the following method comprehensively considers the influence of the wind speed on the diffusion distance of the malodorous gas pollutants and calculates the pollutant emission amount corresponding to the smoke mass, and the detailed description is as follows:
(1) If the wind speed at the monitoring point is less than 1.0m/s (including a calm wind state, namely the wind speed is 0 m/s), the concentration of the malodorous gas pollutants monitored by the monitoring pointCPollutant discharge amount of smoke group corresponding to the smoke groupQThe relationship between them is:
wherein the content of the first and second substances,
the downwind diffusion coefficient is the coefficient of diffusion,
the diffusion coefficient of the side wind direction is,
is a vertical diffusion coefficient of a gaussian equation,d a is the downwind component of the distance between the center of the smoke mass and the monitoring point,d c is the vertical component of the distance between the center of the plume and the monitoring point,Gis a vertical coefficient of a Gaussian equation,Hthe effective height of the center of the tobacco mass above the ground,his the height of the mixed layer.
Side wind diffusion coefficient (i.e. horizontal diffusion coefficient)
Vertical diffusion coefficient of sum gaussian equation
Mainly for the beginning and the end of the smoke mass (or the smoke after being elongated) within a time step. The diffusion coefficient of the smoke mass changes continuously along with the change of time and diffusion distance, so that an equation with the two parameters (time and diffusion distance) as variables can be respectively established to calculate the diffusion coefficient.
(2) If the wind speed at the monitoring point is not less than 1.0m/s, the relationship between the concentration of the malodorous gas pollutants monitored by the monitoring point and the pollutant emission amount of the smoke mass corresponding to the concentration is as follows:
wherein, the first and the second end of the pipe are connected with each other,j∈[1，N]，Q j is the wind speed of not less than 1.0m/sjThe pollutant discharge amount of the cigarette mass corresponding to each monitoring point after being superposed with the wind field,C j is as followsjThe concentration of malodorous gas pollutants monitored by each monitoring point,U j is as followsjAverage wind speed over a target time period at each monitoring point;
is as followsjAverage height of exhaust funnel in monitoring range of each monitoring point, if no exhaust funnel exists in monitoring range, then
The value is 1;αis a vertical diffusion coefficient of Gaussian equation
The power of (a) is,γis a vertical diffusion coefficient of Gaussian equation
Is/are as followsαCoefficient of order, i.e.
，x j Is as followsjActual monitoring radius of each monitoring point (same asxOnly that here is specifically referred to asjThe actual monitoring radius of each monitoring point),bis a constant term; in addition, the firstjA monitoring point and aj1 monitoring points always kept adjacentThe specific distribution can be divided according to actual conditions.
Generally, in an odor monitoring area, at least one factory-boundary odor online monitoring system is installed in a monitoring range of every square kilometer to monitor the concentration of odor gas pollutants near the ground, namely, the area covered by each factory-boundary odor online monitoring system for monitoring odor unorganized emission sourcesS≤1km 2 For example, if 2 plant-boundary odor on-line monitoring systems are arranged in each square kilometer of monitoring range, the area covered by each plant-boundary odor on-line monitoring systemSIs 0.5km 2 By analogy, the arrangement of the calculated pollutant discharge amount corresponding to each smoke group has practical significance; accordingly, the actual monitoring radius of the monitoring point
。
In practical application, some buildings or obstacles may have obvious influence on the diffusion and lifting of the smoke discharged by the low short smoke mass, so that the migration and diffusion routes of the smoke are changed, and the phenomenon is called building downwash; at this time, the route of the migration and diffusion of the gas flow can be divided into two parts:
on one side of the windward side of the building or the obstacle, the wind carrying with the pollutants is blocked by the building or the obstacle, and a part of the airflow bypasses the building or the obstacle, moves forwards from two sides and generates rotary lifting at the lee side of the building or the obstacle;
(II) the other part of the airflow is blocked by the building or the obstacle and can directly jump over the building or the obstacle;
the air flow of the two parts of which the migration routes are changed can form a cave region; when the airflow passes through the hole area, the turbulence intensity is gradually increased, the turbulence characteristic is gradually the same as that of the airflow without the obstruction influence of buildings or obstacles, and the area is called a turbulence excitation area. Thus, the present embodiment parameterizes the turbulence excitation region.
Specifically, in step S3, it is determined whether the condition for washing the building down is satisfied within the monitoring range of the monitoring point; if it isIf so, then the vertical diffusion coefficient of the Gaussian equation is calculated according to the size of the building
Correcting; if not, the vertical diffusion coefficient of the Gaussian equation
Actual monitoring radius taking value as monitoring pointx。
Wherein, the condition of washing the building is as follows:
wherein the content of the first and second substances,H q is the maximum height of the exhaust funnel within the monitoring range of the monitoring point,H b to be the height of the building within the monitoring range of the monitoring point,L b for the smaller of the height and width of the building,T b is a constant coefficient of height of the building, usuallyT b The value is 0.5.
At this time, the vertical diffusion coefficient of the Gaussian equation is calculated according to the size of the building
The following three different cases exist for making the correction:
if it isH w /H b When the content of the organic acid is more than or equal to 5,
；
if the content is less than or equal to 1H w /H b When the ratio is less than 5, the reaction solution is,
；
if it isH w /H b When the ratio is less than 1, the reaction solution is,
；
H w in order to be the width of the building,H b is the height of the building and is,xis the actual monitoring radius of the monitoring point.
And S4, overlapping the pollutant discharge amount corresponding to each smoke mass and the motion trail in the three-dimensional wind field, and splicing according to a preset volume fraction to obtain a pollutant diffusion distribution diagram of the malodorous gas pollutants in the whole malodorous monitoring area in the atmosphere, as shown in FIG. 3.
Wherein, if the overlapping condition of the cigarette groups exists in the splicing process, the overlapping part is cut off; for the specific stacking and splicing process, reference may be made to the prior art, which is not described herein again.
In addition, the pollutant diffusion distribution map is sharpened through an image processing technology, as shown in fig. 4.
And S5, positioning the position of the odor pollution source according to the pollutant diffusion distribution map. As shown in figure 4, Q1, Q2 are pollution source central point position, the diffusion condition of foul gas pollutant in the atmosphere can be observed clearly through the density degree of contour line and the depth degree of colour, this diffusion condition has combined the blockking of building or barrier, meteorological conditions such as wind speed, wind direction, objectively accurate, all show clearly to the specific source place of pollutant and pollutant discharge intensity, for environmental protection department fixes a position the pollution source fast, handle the foul smell incident of polluting and provide assistance, important reality using meaning has.
Based on the air diffusion traceability method based on the factory-boundary malodor online monitoring system in the embodiment, as shown in fig. 5, the embodiment further provides an air diffusion traceability system based on the factory-boundary malodor online monitoring system, which includes an acquisition module, a segmentation module, a calculation module, a trajectory acquisition module, a judgment module, a splicing module, a sharpening module, and a positioning module.
Specifically, a factory-bound odor online monitoring system is used for sampling malodorous gas generated in the industries of chemical industry, petroleum refining, pharmacy, coating, papermaking, food processing, essence and spice, sewage treatment, garbage landfill and the like, an ultraviolet absorption spectrum technology is used for generating a spectrum signal in a gas pool, a multi-component aliasing light absorption spectrum is subjected to single-component identification and differentiation through an iterative search optimal algorithm, and corresponding malodorous gas pollutants and the concentration thereof are inverted according to the Beer-Lambert law. The specific structure and detection principle of the factory-bound odor on-line monitoring system can refer to the prior art, and are not repeated herein.
The collection module of this embodiment is used for gathering the foul gas pollutant and the concentration of each monitoring point monitoring, gathers the meteorological information of each monitoring point simultaneously. Specifically, the meteorological information includes the five meteorological parameters, i.e., temperature, humidity, pressure, wind speed and wind direction, in order to simulate the diffusion and migration of malodorous gas pollutants according to meteorological conditions that vary over time and space.
The segmentation module of the embodiment is used for segmenting malodorous gas pollutants monitored by all monitoring points into malodorous gas pollutants according to a preset volume fractionNIndividual cigarette groups; wherein each monitoring point corresponds to a smoke mass and the preset volume fraction is 1N(ii) a In particular, dividedNThe individual lumps corresponding to the grid structure, e.g. 6X 6km 2 The grid corresponds to 36 smoke clusters.
The calculation module of the embodiment is used for calculating to obtain a three-dimensional wind field corresponding to each monitoring point according to the meteorological information of each monitoring point; the calculation of the three-dimensional wind field belongs to the prior art, and is not described herein.
The trajectory acquisition module of the embodiment is used for acquiring the motion trajectory of each smoke group in the corresponding three-dimensional wind field according to the Lagrange particle diffusion model; the lagrangian particle diffusion model belongs to the existing model and is not described herein.
The calculation module of this embodiment is also used for calculating the pollutant emission that each cigarette group corresponds according to foul gas pollutant concentration and the wind speed that combines in the meteorological information respectively. Specifically, taking a single monitoring point as an example, the corresponding smoke mass internal pollutant diffusion distribution formula is improved based on a two-dimensional Gaussian function, the diffusion coefficients of the smoke mass in the downwind direction and the crosswind direction are increased, and the influence of buildings (or undulating terrains with different heights) with different heights on the diffusion of the smoke mass is considered.
As shown in fig. 2, the wind speed has a great influence on the diffusion distance of the malodorous gas pollutants, and the following method comprehensively considers the influence of the wind speed on the diffusion distance of the malodorous gas pollutants and calculates the pollutant discharge amount corresponding to the smoke mass, and the detailed description is as follows:
(1) If the wind speed at the monitoring point is less than 1.0m/s (including a calm wind state, namely the wind speed is 0 m/s), the concentration of the malodorous gas pollutants monitored by the monitoring pointCPollutant discharge amount of smoke mass corresponding to the smoke massQThe relationship between them is:
wherein the content of the first and second substances,
the downwind diffusion coefficient is the coefficient of diffusion,
is the diffusion coefficient of the side wind direction,
is a vertical diffusion coefficient of a gaussian equation,d a is the downwind component of the distance between the center of the smoke mass and the monitoring point,d c is the vertical component of the distance between the center of the plume and the monitoring point,Gis a vertical coefficient of a Gaussian equation,Hthe effective height of the center of the tobacco mass above the ground,his the height of the mixed layer.
Side wind diffusion coefficient (i.e. horizontal diffusion coefficient)
Vertical diffusion coefficient of sum gaussian equation
Mainly for the beginning and the end of the smoke mass (or the smoke after being elongated) in a time step. The diffusion coefficient of the smoke mass changes continuously along with the change of time and diffusion distance, so that an equation with the two parameters (time and diffusion distance) as variables can be respectively established to calculate the diffusion coefficient.
(2) If the wind speed at the monitoring point is not less than 1.0m/s, the relationship between the concentration of the malodorous gas pollutants monitored by the monitoring point and the pollutant emission amount of the smoke mass corresponding to the concentration is as follows:
wherein the content of the first and second substances,j∈[1，N]，Q j is the wind speed of not less than 1.0m/sjThe pollutant discharge amount of the cigarette mass corresponding to each monitoring point after being superposed with the wind field,C j is as followsjThe concentration of malodorous gas pollutants monitored by each monitoring point,U j is as followsjAverage wind speed over a target time period at each monitoring point;
is as followsjAverage height of exhaust funnel in monitoring range of each monitoring point, if no exhaust funnel exists in monitoring range, then
The value is 1;αis a vertical diffusion coefficient of Gaussian equation
The power of (a) is,γis a vertical diffusion coefficient of Gaussian equation
Is/are as followsαCoefficient of order, i.e.
，x j Is as followsjActual radius of monitoring of each monitoring point (same asxOnly that here is specifically referred to asjThe actual monitoring radius of each monitoring point),bis a constant term; in addition, the firstjA monitoring point and the firstjThe-1 monitoring points are always kept adjacent, and the specific distribution can be divided according to the actual situation.
Generally, in an odor monitoring area, at least one factory-boundary odor online monitoring system is installed in a monitoring range of every square kilometer to monitor the concentration of odor gas pollutants near the ground, namely, the area covered by each factory-boundary odor online monitoring system for monitoring odor unorganized emission sourcesS≤1km 2 For example, if 2 factory floor malodors are distributed in the monitoring range of each square kilometerThe measurement system is used for monitoring the area covered by each plant odor on-line monitoring systemSIs 0.5km 2 By analogy, the arrangement of the calculated pollutant discharge amount corresponding to each smoke group has practical significance; accordingly, the actual monitoring radius of the monitoring point
。
In practical application, some buildings or obstacles may have obvious influence on the diffusion and lifting of the smoke discharged by the low short smoke mass, so that the migration and diffusion routes of the smoke are changed, and the phenomenon is called building downwash; at this time, the route of the migration and diffusion of the gas flow can be divided into two parts:
on one side of the windward side of the building or the obstacle, the wind carrying with the pollutants is blocked by the building or the obstacle, and a part of the airflow bypasses the building or the obstacle, moves forwards from two sides and generates rotary lifting at the lee side of the building or the obstacle;
(II) the other part of the airflow is blocked by the building or the obstacle and can directly jump over the building or the obstacle;
the air flow of the two parts of which the migration routes are changed can form a cave region; as the air flow passes through the cavitation zone, the turbulence intensity gradually increases and the turbulence characteristics gradually become the same as those of a turbulent flow not hindered by buildings or obstacles, and this area is called the turbulence excitation zone. Thus, the present embodiment parameterizes the turbulence excitation region.
Specifically, the judgment module of the embodiment is used for judging whether the condition of building washing is met in the monitoring range of the monitoring point; if yes, the vertical diffusion coefficient of the Gaussian equation is calculated according to the size of the building
Correcting; if not, the vertical diffusion coefficient of the Gaussian equation
Actual monitoring radius taking value as monitoring pointx。
Wherein, the condition of washing the building is as follows:
wherein the content of the first and second substances,H q is the maximum height of the exhaust funnel within the monitoring range of the monitoring point,H b to be the height of the building within the monitoring range of the monitoring point,L b the smaller of the height and width of the building,T b is a constant coefficient of height of the building, usuallyT b The value is 0.5.
At this time, the vertical diffusion coefficient of the Gaussian equation is calculated according to the size of the building
The following three different cases exist for making the correction:
if it isH w /H b When the content of the organic acid is more than or equal to 5,
；
if the ratio of 1 to less than or equal toH w /H b When the ratio is less than 5, the reaction solution is,
；
if it isH w /H b When the ratio is less than 1, the reaction solution is,
；
H w is the width of the building and is,H b is the height of the building and is,xis the actual monitoring radius of the monitoring point.
The splicing module of this embodiment is used for overlapping the pollutant emission amount that each cigarette group corresponds and the motion trail in the three-dimensional wind field and splices according to preset volume fraction and obtains the pollutant diffusion distribution map of the foul gas pollutant in the atmosphere in the whole foul monitoring area, as shown in fig. 3. In addition, the pollutant diffusion distribution map is sharpened through an image processing technology by a sharpening module, as shown in fig. 4.
The positioning module of the embodiment is used for positioning the position of the malodor pollution source according to the pollutant diffusion distribution diagram. As shown in fig. 4, Q1 and Q2 are central points of the pollution source, and the diffusion of malodorous pollutants in the atmosphere can be clearly observed through the density degree and the color depth degree of the contour lines, and the diffusion is objectively and accurately combined with the blocking of buildings or obstacles, and meteorological conditions such as wind speed and wind direction.
Example 2:
the difference between the air diffusion traceability method based on the factory-bound malodor online monitoring system in the embodiment and the embodiment 1 is that:
the method has the advantages that the step of judging the washing of the building and the step of correcting the vertical diffusion coefficient of the Gaussian equation are omitted, the calculation amount of tracing is simplified, the tracing efficiency is improved, and the requirements of different applications are met;
other steps can be referred to example 1.
The air diffusion traceability system based on the factory odor online monitoring system in the embodiment is different from the air diffusion traceability system in the embodiment 1 in that:
the correction of a Gaussian equation vertical diffusion coefficient by a judgment module and a calculation module is omitted, the calculation amount of tracing is simplified, the tracing efficiency is improved, and the requirements of different applications are met;
other architectures can refer to example 1.
Example 3:
the difference between the air diffusion traceability method based on the factory-bound malodor online monitoring system in the embodiment and the embodiment 1 is that:
a sharpening processing step is omitted, the tracing efficiency is improved, and the requirements of different applications are met;
other steps can be referred to example 1.
The difference between the air diffusion traceability system based on the factory-bound malodor online monitoring system of the embodiment and the embodiment 1 is that:
a sharpening module is omitted, so that the tracing efficiency is improved, and the requirements of different applications are met;
other architectures can refer to example 1.
It should be noted that the above embodiments can be freely combined as necessary. The foregoing has outlined rather broadly the preferred embodiments and principles of the present invention and it will be appreciated that those skilled in the art may devise variations of the present invention that are within the spirit and scope of the appended claims.
Claims (10)
1. An air diffusion tracing method based on a factory-bound malodor online monitoring system is characterized by comprising the following steps:
s1, arranging in an odor monitoring areaNAn on-line monitoring system for odor in Taiwan factoryNEach monitoring point; wherein the content of the first and second substances,Nis an integer greater than 1;
collecting malodorous gas pollutants and the concentration thereof monitored by each monitoring point, and simultaneously collecting meteorological information of each monitoring point;
s2, dividing malodorous gas pollutants monitored by all monitoring points into the malodorous gas pollutants according to a preset volume fractionNIndividual cigarette groups; wherein each monitoring point corresponds to a cigarette mass with a preset volume fraction of 1-N；
Calculating according to the meteorological information of each monitoring point to obtain a three-dimensional wind field corresponding to each monitoring point;
s3, obtaining the motion trail of each smoke group in the corresponding three-dimensional wind field according to the Lagrange particle diffusion model;
respectively calculating pollutant discharge amount corresponding to each smoke group according to the concentration of the malodorous gas pollutants and the wind speed in the meteorological information;
s4, overlapping the pollutant discharge amount corresponding to each smoke mass and the motion trail in the three-dimensional wind field, and splicing according to a preset volume fraction to obtain a pollutant diffusion distribution map of the malodorous gas pollutants in the whole malodorous monitoring area in the atmosphere;
and S5, positioning the position of the odor pollution source according to the pollutant diffusion distribution map.
2. The air diffusion traceability method based on the factory-bound malodor on-line monitoring system as claimed in claim 1, wherein the meteorological information further comprises temperature, humidity, pressure and wind direction.
3. The air diffusion tracing method based on factory interior malodor on-line monitoring system according to claim 2, wherein in step S3, the concentration of malodorous gas pollutants monitored by monitoring points corresponding to wind speeds less than 1.0m/S is usedCPollutant discharge amount of smoke mass corresponding to the smoke massQThe relationship between them is:
wherein the content of the first and second substances,
the downwind diffusion coefficient is the coefficient of diffusion,
the diffusion coefficient of the side wind direction is,
is a vertical diffusion coefficient of a gaussian equation,d a is the downwind component of the distance between the center of the smoke mass and the monitoring point,d c is the vertical component of the distance between the center of the plume and the monitoring point,Gis a vertical coefficient of a Gaussian equation,Hthe effective height of the center of the tobacco mass above the ground,his the height of the mixed layer.
4. The air diffusion tracing method based on the factory-bound-malodor online monitoring system according to claim 3, wherein in the step S3, the relationship between the concentration of malodorous gas pollutants monitored by the monitoring point with the wind speed not less than 1.0m/S and the pollutant emission amount of the smoke mass corresponding to the concentration is as follows:
wherein the content of the first and second substances,j∈[1，N]，Q j the wind speed is not less than 1.0m/sjEach monitoring point corresponds toThe pollutant discharge amount of the smoke group superposed with the wind field,C j is as followsjThe concentration of malodorous gas pollutants monitored by each monitoring point,U j is as followsjAverage wind speed over a target time period at each monitoring point;
is as followsjAverage height of exhaust funnel in monitoring range of each monitoring point, if no exhaust funnel exists in monitoring range, then
The value is 1;αis a vertical diffusion coefficient of Gaussian equation
The power of (a) is,γis a vertical diffusion coefficient of Gaussian equation
Is/are as followsαCoefficient of order, i.e.
，x j Is as followsjThe actual radius of monitoring of the individual monitoring points,bis a constant term;
first, thejA monitoring point and the firstjAdjacent to 1 monitoring point.
5. The air diffusion tracing method based on the factory odor online monitoring system according to claim 3 or 4, characterized in that in step S3, it is further determined whether the condition of building washing is satisfied within the monitoring range of the monitoring point; if yes, the vertical diffusion coefficient of the Gaussian equation is calculated according to the size of the building
Correcting; if not, the vertical diffusion coefficient of the Gaussian equation
And taking the value as the actual monitoring radius of the monitoring point.
6. The air diffusion tracing method based on the factory-bound-malodor online monitoring system according to claim 5, wherein the conditions for building washing down are as follows:
wherein, the first and the second end of the pipe are connected with each other,H q is the maximum height of the exhaust funnel in the monitoring range of the monitoring point,H b the height of the building within the monitoring range of the monitoring point,L b the smaller of the height and width of the building,T b is a building height constant coefficient.
7. The method as claimed in claim 6, wherein the air diffusion tracing method is based on a plant-wide malodor on-line monitoring systemT b The value is 0.5.
8. The air diffusion tracing method based on the factory-bound-malodor online monitoring system according to claim 6, wherein the modifying the Gaussian equation vertical diffusion coefficient according to the size of the building comprises:
if it isH w /H b When the content of the organic acid is more than or equal to 5,
；
if the content is less than or equal to 1H w /H b When the ratio is less than 5, the reaction solution is,
；
if it isH w /H b When the ratio is less than 1, the reaction solution is,
；
H w in order to be the width of the building,H b is the height of the building and is,xis the actual monitoring radius of the monitoring point.
9. The air diffusion tracing method based on the factory-boundary malodor online monitoring system according to claim 1, wherein in the step S4, the pollutant diffusion profile is sharpened.
10. An air diffusion traceability system based on a plant-wide malodor online monitoring system, which is applied to the air diffusion traceability method of any one of claims 1-9, wherein the air diffusion traceability system comprises:
the collection module is used for collecting the malodorous gas pollutants and the concentration thereof monitored by each monitoring point and simultaneously collecting the meteorological information of each monitoring point;
a division module for dividing the malodorous gas pollutants monitored by all monitoring points into the malodorous gas pollutants according to a preset volume fractionNIndividual cigarette groups;
the calculation module is used for calculating to obtain a three-dimensional wind field corresponding to each monitoring point according to the meteorological information of each monitoring point;
the trajectory acquisition module is used for acquiring the motion trajectory of each smoke group in the corresponding three-dimensional wind field according to the Lagrange particle diffusion model;
the calculation module is also used for respectively calculating pollutant discharge amount corresponding to each smoke group according to the concentration of the malodorous gas pollutants and by combining the wind speed in the meteorological information;
the splicing module is used for superposing the pollutant discharge amount corresponding to each smoke group and the motion trail in the three-dimensional wind field and splicing according to a preset volume fraction to obtain a pollutant diffusion distribution map of the malodorous gas pollutants in the whole malodorous monitoring area in the atmosphere;
and the positioning module is used for positioning the position of the odor pollution source according to the pollutant diffusion distribution diagram.
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