CN109060456B - Calibration device and method for fixed source dilution channel sampler - Google Patents
Calibration device and method for fixed source dilution channel sampler Download PDFInfo
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Abstract
The invention discloses a calibration device and a calibration method for a fixed source dilution channel sampler. The calibration device comprises: the device comprises a fan, an air pipeline, an aerosol pipeline, a heating device, a water vapor conveying device and a standard dust device; the first end of the air pipeline is connected with the first end of the aerosol pipeline through a heating device; a fan is fixed at the second end of the air pipeline; a dust inlet and a water vapor inlet are also formed in the pipe wall of the first end of the aerosol pipeline; the water vapor conveying device is connected with the aerosol pipeline through a water vapor inlet; the standard dust device is connected with the aerosol pipeline through a dust inlet; the pipe wall of the middle section of the aerosol pipeline is also provided with a plurality of groups of test ports, each group of test ports comprises a plurality of test ports, and the plurality of test ports of the same group are uniformly distributed on the pipe wall of the aerosol pipeline in a surrounding manner; the sampler measures the dust concentration in the aerosol duct through the test port. By adopting the calibration device and the calibration method, the sampler can be calibrated in real time, so that the use precision of the sampler is improved.
Description
Technical Field
The invention relates to the field of sampler calibration, in particular to a calibration device and method of a fixed source dilution channel sampler.
Background
The particulate matter sampling and analyzing instrument is widely applied to the fields of environmental protection, scientific research and the like, and the analysis of air quality by fixed sources (chimneys of steel plants, chimneys of cement plants, heating boilers and the like), mobile sources (automobiles, airplanes, ships and the like), environment receptors (samplers of monitoring sites) and the like relates to the analysis of particulate matters, including the analysis of the number concentration, the mass spectrum components and the like of the particulate matters, and the analysis instrument are required to be related to the particulate matter. When current particulate matter instrument sampling analysis data, because the unknown of sampling environment, often can appear data inaccurate, overrange, outlier, instrument operating parameter phenomenon such as unusual, the project research that sometimes spends many material resources, financial resources to go on, because changeable environmental problem leads to data collection few, inaccurate, and is big with actual data difference.
The operating parameters of the particle instrument are different under different environmental conditions, and the temperature, the humidity, the altitude and the like have influence on the operating parameters of the particle instrument. The existing simulation test device for researching aerosol particles is usually a box body, is used for generating aerosol particles and then statically calibrating an instrument, cannot control and simulate the actual conditions such as pressure, wind speed and the like, and has larger change of the operating parameters of the particle instrument in a complex environment due to lack of simulation of the real environment of a windy, high-altitude, low-pressure and low-temperature area.
Disclosure of Invention
The invention aims to provide a calibration device and a calibration method for a fixed source dilution channel sampler, which are used for calibrating the fixed source dilution channel sampler in real time by simulating various environments so as to improve the use precision of the fixed source dilution channel sampler.
In order to achieve the purpose, the invention provides the following scheme:
a calibration apparatus for a fixed-source dilution channel sampler, the calibration apparatus comprising: the device comprises a fan, an air pipeline, an aerosol pipeline, a heating device, a water vapor conveying device and a standard dust device;
the first end of the air pipeline is connected with the first end of the aerosol pipeline through the heating device; the fan is fixed at the second end of the air pipeline; the fan is used for sending the air heated by the heating device into the aerosol pipeline;
a dust inlet and a water vapor inlet are also formed in the pipe wall of the first end of the aerosol pipeline; the water vapor conveying device is connected with the aerosol pipeline through the water vapor inlet and is used for conveying water vapor into the aerosol pipeline; the standard dust device is connected with the aerosol pipeline through the dust inlet and is used for generating standard dust and transmitting the standard dust into the aerosol pipeline;
a plurality of groups of test ports are also arranged on the pipe wall of the middle section of the aerosol pipeline, each group of test ports comprises a plurality of test ports, and the plurality of test ports of the same group are uniformly distributed on the pipe wall of the aerosol pipeline in a surrounding manner; the fixed source dilution channel sampler measures the dust concentration in the aerosol pipeline through the test port, and the calibration of each fixed source dilution channel sampler is realized according to the analysis of a dust concentration standard value and the measurement value of each fixed source dilution channel sampler.
Optionally, the calibration device adjusts the aerosol temperature in the aerosol pipeline by adjusting the heating temperature of the heating device; the calibration device adjusts the aerosol humidity in the aerosol pipeline by adjusting the transmission power of the water vapor transmission device; the calibration device adjusts the dust concentration in the aerosol pipeline by adjusting the power of the standard dust device.
A method of calibrating a fixed-source dilution channel sampler, the method comprising:
obtaining a measurement value of a fixed source dilution channel sampler; the measured value is a dust concentration value in the aerosol pipeline obtained by the fixed source dilution channel sampler through a sampling port of the calibration device; the calibration device comprises: the device comprises a fan, an air pipeline, an aerosol pipeline, a heating device, a water vapor conveying device and a standard dust device; the first end of the air pipeline is connected with the first end of the aerosol pipeline through the heating device; the fan is fixed at the second end of the air pipeline; the fan is used for sending the air heated by the heating device into the aerosol pipeline; a dust inlet and a water vapor inlet are also formed in the pipe wall of the first end of the aerosol pipeline; the water vapor conveying device is connected with the aerosol pipeline through the water vapor inlet and is used for conveying water vapor into the aerosol pipeline; the standard dust device is connected with the aerosol pipeline through the dust inlet and is used for generating standard dust and transmitting the standard dust into the aerosol pipeline; a plurality of groups of test ports are also arranged on the pipe wall of the middle section of the aerosol pipeline, each group of test ports comprises a plurality of test ports, and the plurality of test ports of the same group are uniformly distributed on the pipe wall of the aerosol pipeline in a surrounding manner;
acquiring a standard value of dust concentration in the aerosol pipeline;
and determining the measurement efficiency of the fixed source dilution channel sampler according to the dust concentration standard value and the measured value.
Optionally, the obtaining the measurement value of the fixed-source dilution channel sampler previously further includes:
acquiring set parameters of simulated aerosol, wherein the set parameters comprise the temperature, the humidity and the dust concentration of the aerosol;
adjusting the heating temperature of the heating device to adjust the temperature of the aerosol;
adjusting the delivery power of the water vapor delivery device to adjust the humidity of the aerosol;
adjusting the power of the standard dust device to adjust the dust concentration of the aerosol.
Optionally, the obtaining a measurement value of the fixed-source dilution channel sampler further includes:
obtaining a plurality of measurements of the fixed source dilution channel sampler at a plurality of test ports; the plurality of test ports belong to the same group;
determining a dispersion of the fixed source dilution channel samplers from the plurality of measurements.
Optionally, the determining the measurement efficiency of the fixed-source dilution channel sampler according to the dust concentration standard value and the measurement value further includes:
acquiring a plurality of groups of measured values of different fixed source dilution channel samplers at different groups of test ports; different groups of measured values correspond to different groups of test ports;
and determining parallelism among different fixed source dilution channel samplers according to the multiple groups of measured values.
According to the specific embodiment provided by the invention, the invention discloses the following technical effects:
when the calibration device is used for calibration, different calibration requirements of the fixed source dilution channel sampler can be realized through a plurality of groups of test ports and a plurality of test ports in the same group, and the calibration efficiency of the sampler can be improved;
moreover, different testing environments can be simulated by adjusting the temperature, the humidity and the dust concentration of the aerosol, so that calibration results of the sampler in different testing environments can be obtained, and the calibrated sampler is adopted for sampling, so that the sampling precision of the sampler can be improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise.
FIG. 1 is a schematic structural diagram of a calibration apparatus of a fixed source dilution channel sampler according to the present invention;
FIG. 2 is a schematic flow chart of the calibration method of the fixed source dilution channel sampler of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
FIG. 1 is a schematic structural diagram of a calibration apparatus of a fixed source dilution channel sampler according to the present invention. As shown in fig. 1, the calibration apparatus includes: the device comprises a fan 1, an air pipeline 2, an aerosol pipeline 3, a heating device 4, a water vapor conveying device 5 and a standard dust device 6;
a first end of the air duct 2 is connected to a first end of the aerosol duct 3 via the heating device 4. The heating device 4 heats the air in the air duct 2. The fan 1 is fixed at the second end of the air pipeline 2; the fan 1 powers the air flow, and as shown in the figure, the fan 1 provides wind to transfer heated air in the air duct 2 to the aerosol duct 3.
The pipe wall of the first end of the aerosol pipeline 3 is also provided with a dust inlet 3-1 and a water vapor inlet 3-2; the water vapor conveying device 5 is connected with the aerosol pipeline 3 through the water vapor inlet 3-2, and the water vapor conveying device 5 conveys the generated water vapor into the aerosol pipeline 3 through the pipeline and the water vapor inlet 3-2. The standard dust device 6 is connected with the aerosol pipeline 3 through the dust inlet 3-1, and the standard dust device 6 is used for generating standard dust and transmitting the generated standard dust into the aerosol pipeline 3 through the pipeline and the dust inlet 3-1. In this way, aerosol is formed in the aerosol pipe 3, and the aerosol is filled in the whole aerosol pipe 3 by the power provided by the fan 1.
The temperature, the humidity and the dust concentration of the aerosol can be adjusted, and the effect of adjusting the temperature of the aerosol in the aerosol pipeline 3 is realized by adjusting the heating temperature of the heating device 4; the effect of adjusting the aerosol humidity in the aerosol pipeline 3 is realized by adjusting the transmission power of the water vapor transmission device 5; the effect of adjusting the dust concentration in the aerosol pipeline 3 is achieved by adjusting the power of the standard dust device 6.
The temperature regulation range is usually room temperature-115 ℃, the humidity regulation range is usually room humidity-90%, at this time, when the temperature and humidity regulation range is determined according to the room temperature and the room humidity, the calibration device of the invention is also provided with a temperature sensor and a humidity sensor, the heating device 4 determines the temperature regulation range according to room temperature data transmitted by the temperature sensor, and the water vapor conveying device 5 determines the humidity regulation range according to the room humidity data transmitted by the humidity sensor. Meanwhile, some samplers are required to be used in special environments, such as low temperature, high humidity, etc. In this case, the temperature sensor and the humidity sensor are switched off, the heating device 4 determining the temperature control range on the basis of its own power or a preset threshold value, and the water vapor delivery device 5 determining the humidity control range on the basis of its own power or a preset threshold value.
The pipe wall of the middle section of the aerosol pipeline 3 is also provided with a plurality of groups of test ports 3-3, each group of test ports comprises a plurality of test ports, the plurality of test ports of the same group are uniformly distributed on the pipe wall of the aerosol pipeline 3 in a surrounding way, and each group of test ports can comprise 3 or 4 test ports. In this case, the plane formed by the plurality of test ports of the same group is perpendicular to the axis of the aerosol pipe 3, and the plurality of groups of test ports are distributed along the axis of the aerosol pipe 3. As shown, 5 sets of test ports are included.
The fixed source dilution channel sampler measures the dust concentration in the aerosol pipeline through the test port, and the calibration of each fixed source dilution channel sampler is realized according to the measurement value of each fixed source dilution channel sampler and the analysis of the dust concentration standard value in the simulation environment. Meanwhile, according to different use environments of each fixed source dilution channel sampler, corresponding parameters of aerosol can be adjusted, so that the sampler can be calibrated in corresponding environments.
By adopting the calibration device, the invention also provides a calibration method, and fig. 2 is a flow schematic diagram of the calibration method of the fixed source dilution channel sampler. As shown in fig. 2, the calibration method includes:
step 100: measurements of the fixed source dilute channel sampler are obtained. And placing the fixed source dilution channel sampler at a test port of the aerosol pipeline, and calculating according to the display value of the sampler to obtain the measured value of the dust concentration at the corresponding position of the sampler.
Step 200: and acquiring a standard value of dust concentration in the aerosol pipeline. The standard value of the dust concentration is preset in advance, and the output power of the standard dust device is properly adjusted according to the standard value of the dust concentration, so that the aerosol in the aerosol pipeline keeps the standard value concentration.
Step 300: and determining the measurement efficiency of the fixed source dilution channel sampler according to the dust concentration standard value and the measured value. For example, the sampler corresponds to a measurement value of Amg/m3The standard value of dust concentration is Bmg/m3Then the collection efficiency of the sampler is
When the sampler is used specifically, the actual value of the point to be measured can be determined according to the acquisition efficiency and the measured value of the fixed source dilution channel sampler.
Besides the calibration method, the calibration device can realize the following calibration when in use:
the dispersion calibration of the same instrument can be realized. And measuring the same instrument in the same group of test ports for multiple times, and calculating the standard deviation to obtain the dispersion of the same instrument.
And the simultaneous calibration of multiple groups of instruments can be realized. When multiple groups of instruments are calibrated, each group of instruments corresponds to one group of test ports, and the collection efficiency of the multiple groups of instruments can be obtained respectively. Then, according to the comparison among the multiple groups of instruments, the parallelism among the multiple groups of instruments can be obtained.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The principles and embodiments of the present invention have been described herein using specific examples, which are provided only to help understand the method and the core concept of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.
Claims (6)
1. A calibration apparatus for a fixed-source dilution tunnel sampler, the calibration apparatus comprising: the device comprises a fan, an air pipeline, an aerosol pipeline, a heating device, a water vapor conveying device and a standard dust device;
the first end of the air pipeline is connected with the first end of the aerosol pipeline through the heating device; the fan is fixed at the second end of the air pipeline; the fan is used for sending the air heated by the heating device into the aerosol pipeline; the pipe diameter of the first end of the air pipeline is larger than that of the second end of the air pipeline, and the pipe diameter of the first end of the aerosol pipeline is larger than that of the middle section of the aerosol pipeline;
a dust inlet and a water vapor inlet are also formed in the pipe wall of the first end of the aerosol pipeline; the water vapor conveying device is connected with the aerosol pipeline through the water vapor inlet and is used for conveying water vapor into the aerosol pipeline; the standard dust device is connected with the aerosol pipeline through the dust inlet and is used for generating standard dust and transmitting the standard dust into the aerosol pipeline;
a plurality of groups of test ports are also arranged on the pipe wall of the middle section of the aerosol pipeline, each group of test ports comprises a plurality of test ports, and the plurality of test ports of the same group are uniformly distributed on the pipe wall of the aerosol pipeline in a surrounding manner; the fixed source dilution channel sampler measures the dust concentration in the aerosol pipeline through the test port, and the calibration of each fixed source dilution channel sampler is realized according to the analysis of a dust concentration standard value and the measurement value of each fixed source dilution channel sampler.
2. The calibration device according to claim 1, wherein the calibration device adjusts the aerosol temperature in the aerosol pipeline by adjusting the heating temperature of the heating device; the calibration device adjusts the aerosol humidity in the aerosol pipeline by adjusting the transmission power of the water vapor transmission device; the calibration device adjusts the dust concentration in the aerosol pipeline by adjusting the power of the standard dust device.
3. A calibration method of a fixed source dilution channel sampler, the calibration method comprising:
obtaining a measurement value of a fixed source dilution channel sampler; the measured value is a dust concentration value in the aerosol pipeline obtained by the fixed source dilution channel sampler through a sampling port of the calibration device; the calibration device comprises: the device comprises a fan, an air pipeline, an aerosol pipeline, a heating device, a water vapor conveying device and a standard dust device; the first end of the air pipeline is connected with the first end of the aerosol pipeline through the heating device; the fan is fixed at the second end of the air pipeline; the pipe diameter of the first end of the air pipeline is larger than that of the second end of the air pipeline, and the pipe diameter of the first end of the aerosol pipeline is larger than that of the middle section of the aerosol pipeline; the fan is used for sending the air heated by the heating device into the aerosol pipeline; a dust inlet and a water vapor inlet are also formed in the pipe wall of the first end of the aerosol pipeline; the water vapor conveying device is connected with the aerosol pipeline through the water vapor inlet and is used for conveying water vapor into the aerosol pipeline; the standard dust device is connected with the aerosol pipeline through the dust inlet and is used for generating standard dust and transmitting the standard dust into the aerosol pipeline; a plurality of groups of test ports are also arranged on the pipe wall of the middle section of the aerosol pipeline, each group of test ports comprises a plurality of test ports, and the plurality of test ports of the same group are uniformly distributed on the pipe wall of the aerosol pipeline in a surrounding manner;
acquiring a standard value of dust concentration in the aerosol pipeline;
and determining the measurement efficiency of the fixed source dilution channel sampler according to the dust concentration standard value and the measured value.
4. The calibration method according to claim 3, wherein the obtaining of the measurement values of the fixed-source dilution channel sampler further comprises:
acquiring set parameters of simulated aerosol, wherein the set parameters comprise the temperature, the humidity and the dust concentration of the aerosol;
adjusting the heating temperature of the heating device to adjust the temperature of the aerosol;
adjusting the delivery power of the water vapor delivery device to adjust the humidity of the aerosol;
adjusting the power of the standard dust device to adjust the dust concentration of the aerosol.
5. The calibration method according to claim 3, wherein the obtaining of the measurement values of the fixed-source dilution channel sampler is followed by:
obtaining a plurality of measurements of the fixed source dilution channel sampler at a plurality of test ports; the plurality of test ports belong to the same group;
determining a dispersion of the fixed source dilution channel samplers from the plurality of measurements.
6. The calibration method according to claim 3, wherein the determining the measurement efficiency of the fixed-source dilution channel sampler according to the dust concentration standard value and the measurement value further comprises:
acquiring a plurality of groups of measured values of different fixed source dilution channel samplers at different groups of test ports; different groups of measured values correspond to different groups of test ports;
and determining parallelism among different fixed source dilution channel samplers according to the multiple groups of measured values.
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