VOCs emission flux infrared remote sensing monitoring system based on vertical wind field data

Abstract

The utility model discloses a VOCs (volatile organic compounds) emission flux infrared remote sensing monitoring system based on vertical wind field data, which comprises a mobile platform, the mobile platform is provided with an infrared shielding daily flux system, and the infrared shielding daily flux system is used for measuring an intermediate infrared absorption spectrum of the concentration of a volatile organic compound column. The infrared sun-masked flux system comprises a sun tracker and a mid-infrared Fourier transform spectrometer arranged at a light outlet of the sun tracker, a movable air extraction type Fourier transform infrared spectrum system is further arranged on the movable platform and used for measuring the volume concentration of the volatile organic compounds, a gas pump extracts plume air into a long-optical-path absorption cell, and the long-optical-path absorption cell is used for absorbing the plume air; the long-optical-path absorption cell is used for reflecting infrared light emitted by the infrared light source for multiple times and sending the infrared light to the intermediate infrared spectrometer; the mid-infrared spectrometer monitors and analyzes the plume air components and obtains the volume concentration of the to-be-detected components; the vertical wind field measuring device is used for continuously measuring wind speed and wind direction and acquiring vertical wind field data; and the positioning device is used for acquiring latitude and longitude information.

Description

TECHNICAL FIELD

[0001] The utility model relates to atmospheric environment monitoring and optical remote sensing field, concretely relates to a VOCs emission flux infrared remote sensing monitoring system based on vertical wind field data. BACKGROUND

[0002] The main method of VOCs unorganized emission online monitoring of industrial park in the current specification of our country is: gas chromatography flame ionization monitor (GC-FID) and gas chromatography mass spectrometer (GC-MS), however above technology can only monitor single station VOCs component concentration, cannot realize the direct monitoring of multi-point source, unorganized source VOCs emission flux, therefore new monitoring means is urgently needed to quantify the more larger multi-point source, unorganized source.

[0003] The wind speed for flux calculation should be the average speed of the measured gas, but spectral measurement does not give information about the vertical distribution of the gas, so the wind field uncertainty is the largest error source in the inversion of volatile organic compound emission flux. In order to obtain vertical wind field data, vertical wind field measuring devices are used for measurement, including but not limited to meteorological wind pole, near-ground meteorological station, GPS radio sonde, wind profile radar. Among them, the main function of meteorological wind pole is to install various meteorological sensors, including anemometer, wind vane, etc., to measure wind speed and wind direction information at different heights near the ground, and its advantage is that it can provide relatively stable and continuous near-ground wind field information and provide wind field basic data. The data of near-ground meteorological station has high accuracy and reliability, and other meteorological elements such as temperature, humidity, pressure, etc. can also be combined to comprehensively analyze the influence of atmospheric environment on wind field. The GPS radio sonde is mainly launched from the ground by a large helium balloon and continuously climbs in the atmosphere. During the flight, the radio sonde can transmit its GPS position information and other measurement data to the ground receiver in real time, and then the vertical wind field information can be recorded completely. Since the balloon and the radio sonde will move along the local horizontal wind field in the atmospheric environment, by deeply analyzing the change rule of the horizontal position of the sonde with time, the height profile of the wind speed can be accurately reconstructed. The wind profile radar can provide continuous wind profile data from near the ground to a higher height, and its detection height can be different according to the performance and setting of the radar, which can reach thousands of meters or even higher. The wind profile radar has high time resolution and spatial resolution, and can quickly and accurately monitor the dynamic changes of the wind field. Through the combination of the above vertical wind field measuring devices, the vertical profile of vector wind speed and direction can be established, and the accuracy of wind field measurement can be improved.

[0004] The prior art such as Chinese patent with publication number CN101694461A discloses a kind of pollution source gas emission flux infrared multi-component monitoring method and system, including a movable platform, the movable platform is provided with solar tracker, the front of the light outlet of solar tracker is provided with infrared spectrometer, the output of infrared spectrometer is connected with computer, the movable platform is also provided with GPS locator, the GPS locator is connected to the corresponding input end of computer.

[0005] Although the above patent can measure pollution component emission flux, it cannot measure component volume concentration, and it is difficult to obtain corresponding emission plume height. At the same time, the measurement of wind speed and direction is mainly near-ground data, and the vector wind speed and direction from the ground to the emission plume cannot be obtained, so there will be a large error in the process of emission flux measurement. At the same time, the number of volatile organic compounds measured by a single system is limited, and multiple systems can broaden the application range of the monitoring method. Practical new type content

[0006] The technical problem to be solved by the present application is to provide an infrared remote sensing monitoring system for VOCs emission flux based on vertical wind field data, which can compensate for the shortcomings of conventional methods for measuring the amount of gas emitted by pollution sources, and provide a mobile, fast and easy-to-use, high-accuracy, and more-component VOCs emission flux monitoring system.

[0007] The wind speed used for flux calculation should be the average speed of the measured gas, but spectral measurement does not provide information about the vertical distribution of the gas, so wind field uncertainty is the largest error source in VOCs emission flux inversion. Since the wind and the gas in the emission plume are not measured at the same place or at the same time, the measured result may not represent the wind speed in the plume, and conventional near-ground anemorumbometer cannot effectively monitor the wind speed and direction at high altitudes, so a more complete vertical wind field measuring instrument is needed to establish the vertical profile of vector wind speed and direction through continuous measurement, and improve the accuracy of wind field measurement.

[0008] To solve the above problems, the technical scheme of the present application is as follows:

[0009] The present application provides an infrared remote sensing monitoring system for VOCs emission flux based on vertical wind field data, which includes a mobile platform, an infrared solar occultation flux system is provided on the mobile platform, the infrared solar occultation flux system is used to measure the mid-infrared absorption spectrum of volatile organic compound column concentration, the infrared solar occultation flux system includes a solar tracker and a corresponding mid-infrared Fourier transform spectrometer provided at the light outlet of the solar tracker, and the mobile platform is also provided with:

[0010] The mobile air extraction Fourier transform infrared spectrum system for measuring the volume concentration of volatile organic matters comprises an infrared light source, a long optical path absorption cell, a gas pump and a mid-infrared spectrometer, the gas pump extracts plume air into the long optical path absorption cell, the long optical path absorption cell is used for multiple reflection of infrared light emitted by the infrared light source and sent into the mid-infrared spectrometer, and the mid-infrared spectrometer monitors and analyzes the plume air components and obtains the volume concentration of the to-be-measured components.

[0011] The vertical wind field measuring device is used for continuously measuring wind speed and wind direction and obtaining vertical wind field data.

[0012] The positioning device is used for obtaining latitude and longitude information.

[0013] Preferably, the sun tracker is an imaging feedback type sun tracker.

[0014] The positioning device is a positioning device based on a GPS positioning system or a Beidou positioning system.

[0015] The vertical wind field measuring device is a meteorological wind pole, a near-ground meteorological station, a GPS radio sonde or a wind profile radar.

[0016] Specifically, the meteorological wind pole is provided with a meteorological sensor; and the meteorological sensor is a wind speed meter and / or a wind vane.

[0017] When the motion platform moves or turns, the sun tracker always aims at the sun by adjusting the angle and position of the internal reflector.

[0018] The monitoring system has the advantages that:

[0019] The monitoring system combines the volume concentration and the column concentration of the same component measured by the infrared sun-avoiding flux system and the mobile air extraction Fourier transform infrared spectrum system, obtains the monitored plume height of the emission plume, obtains the vertical wind field data by using the vertical wind field measuring device, and reduces the error in the emission flux measurement process. Meanwhile, the ratio of the column concentration and the volume concentration of the same component measured by the infrared sun-avoiding flux system and the mobile air extraction Fourier transform infrared spectrum system can convert the volume concentration of the component (such as aromatic volatile organic matter) that cannot be monitored by the single infrared sun-avoiding flux system into the corresponding emission flux, and widens the monitoring range of the prior art. Therefore, the monitoring system has important significance for quantifying the emission of multi-point sources and unorganized sources. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 The utility model discloses a system composition structure schematic diagram.

[0021] Identified in the figure: mobile platform 1, solar tracker 2, mid-infrared Fourier transform spectrometer 3, mid-infrared spectrometer 4, long optical path absorption cell 5, gas pump 6, infrared light source 7, vertical wind field measuring device 8, positioning device 9, computing unit 10. DETAILED DESCRIPTION

[0022] Example 1

[0023] Reference Figure 1 The utility model provides a VOCs emission flux infrared remote sensing monitoring system, including mobile platform 1, be equipped with infrared eclipse flux system on mobile platform 1, and infrared eclipse flux system is used for measuring mid-infrared absorption spectrum of volatile organic matter column concentration, and infrared eclipse flux system includes solar tracker 2 and the mid-infrared Fourier transform spectrometer 3 of corresponding light outlet of solar tracker, still be equipped with on mobile platform 1:

[0024] Mobile air extraction type Fourier transform infrared spectrum system is used for measuring volatile organic matter volume concentration, including infrared light source 7, long optical path absorption cell 5, gas pump 6 and mid-infrared spectrometer 4, gas pump 6 extracts plume air to long optical path absorption cell 5, and long optical path absorption cell 5 is used for multiple reflection infrared light of infrared light source 7 emission and sends into mid-infrared spectrometer 4;Mid-infrared spectrometer 4 monitors and analyzes plume air component and obtains the volume concentration of the component to be measured;Vertical wind field measuring device 8 is used for continuously measuring wind speed and direction, obtains vertical wind field data;Positioning device 9 is used for obtaining latitude and longitude information.

[0025] The solar tracker 2 used in the utility model is selected as an imaging feedback type solar tracker, and the positioning device 9 is a positioning device based on a GPS positioning system or a Beidou positioning system.

[0026] The vertical wind field measuring device 8 used in the utility model includes but is not limited to a meteorological anemometer, a near-ground meteorological station, a GPS radio sonde or a wind profile radar. The meteorological anemometer is provided with a meteorological sensor; and the meteorological sensor includes an anemograph, a wind vane and the like.

[0027] When the mobile platform 1 moves or turns, the solar tracker 2 can always be aligned with the sun by adjusting the angle and position of the internal reflector.

[0028] The VOCs emission flux infrared remote sensing monitoring system further includes a computing unit 10 for analyzing data, and the infrared eclipse flux system utilizes the solar tracker 2 (which can be selected as an imaging feedback type solar tracker) to vertically guide the sunlight into the mid-infrared Fourier transform spectrometer 3, the mid-infrared Fourier transform spectrometer 3 measures and analyzes the sunlight passing through the component to be measured, the obtained data is transmitted to the computing unit 10 for processing, and the column concentration of the component to be measured is obtained.

[0029] The mobile pumping Fourier transform infrared spectroscopy system introduces the plume air into the sample inlet through a Teflon tube, and then extracts the plume air into the long optical path absorption cell 5 through the gas pump 6. The long optical path absorption cell 5 is used to reflect the infrared light emitted by the infrared light source 7 multiple times and send it into the mid-infrared spectrometer 4. The mid-infrared spectrometer 4 can analyze the components of the plume air and obtain the volume concentration of the measured components. The obtained data is transmitted to the computing unit 10.

[0030] The column concentration (mg / m2) of the measured components by the infrared sun-avoiding flux system and the ground volume concentration (mg / m2) of the same components measured by the mobile pumping Fourier transform infrared spectroscopy system are combined to estimate the height of the factory emission plume by the computing unit 10. 2 3 The vertical wind field data from the ground to the height of the emission plume at the site is measured by the vertical wind field measuring device 8. The average vector wind speed during the measurement process is obtained after real-time measurement along the measurement path.

[0031] The column concentration of the gas obtained by the mobile infrared sun-avoiding flux system can constitute a cross section. The latitude and longitude information of the mobile platform is obtained in real time by the positioning device 9 arranged on the mobile platform 1. The column concentration along the driving path is integrated by combining the information. The obtained result is multiplied by the average vector wind speed obtained in the previous step to obtain the total emission flux under the monitoring path.

[0032] The ratio of the column concentration and the volume concentration of the same components measured by the infrared sun-avoiding flux system and the mobile pumping Fourier transform infrared spectroscopy system is combined. The volume concentration of the components that cannot be monitored by a single infrared sun-avoiding flux system is converted into the emission flux by the computing unit 10.​

Claims

1. A VOCs emission flux infrared remote sensing monitoring system based on vertical wind field data, comprising a mobile platform, wherein the mobile platform is equipped with an infrared solar occultation flux system, the infrared solar occultation flux system being used to measure the mid-infrared absorption spectrum of volatile organic compound column concentration, the infrared solar occultation flux system comprising a solar tracker and a mid-infrared Fourier transform spectrometer correspondingly disposed at the light output port of the solar tracker, characterized in that, The mobile platform is also equipped with: A mobile air-pumping Fourier transform infrared spectroscopy system is used to measure the volume concentration of volatile organic compounds. It includes an infrared light source, a long-path absorption cell, a gas pump, and a mid-infrared spectrometer. The gas pump draws a plume of air into the long-path absorption cell, which is used to reflect the infrared light emitted by the infrared light source multiple times and send it to the mid-infrared spectrometer. The mid-infrared spectrometer monitors and analyzes the air components of the plume and obtains the volume concentration of the component to be measured; Vertical wind field measurement device is used to continuously measure wind speed and direction to obtain vertical wind field data; A positioning device used to obtain latitude and longitude information.

2. The VOCs emission flux infrared remote sensing monitoring system according to claim 1, characterized in that, The solar tracker is an imaging feedback solar tracker.

3. The VOCs emission flux infrared remote sensing monitoring system according to claim 1, characterized in that, The positioning device is a positioning device based on a GPS positioning system or a Beidou positioning system.

4. The VOCs emission flux infrared remote sensing monitoring system according to claim 1, characterized in that, The vertical wind field measurement device is a meteorological wind mast, a near-surface meteorological station, a GPS radiosonde, or a wind profiler radar.

5. The VOCs emission flux infrared remote sensing monitoring system according to claim 4, characterized in that, The weather mast is equipped with a weather sensor; The meteorological sensor is an anemometer and / or a wind vane.

6. The VOCs emission flux infrared remote sensing monitoring system according to claim 1, characterized in that, When the mobile platform moves or turns, the solar tracker always aligns with the sun by adjusting the angle and position of its internal reflector.

Images