Box-type controllable high-precision characterization system for volatile components of fugitive sources

Abstract

The present invention provides a box-type controllable high-precision characterization system for volatile components of fugitive sources, and relates to the field of atmospheric pollutant monitoring. The system comprises: a volatilization dilution module configured for providing a volatilization space for a fugitive source sample and introducing a mixed gas into the volatilization space, so as to dilute volatile components of the fugitive source sample; a climate chamber temperature control module configured for controlling the ambient temperature during the volatilization process of the fugitive source sample; a drawer-type sample injection module configured for feeding the fugitive source sample into the volatilization space; and a fugitive source component monitoring module configured for monitoring concentrations of volatile components in gases after the volatilization of the fugitive source sample. In the present invention, the use of a volatilization dilution module ensures a fugitive source sample volatilizes continuously over an extended period of time without interference, while a climate chamber temperature control module accurately controls the ambient temperature during the volatilization process of the fugitive source sample, and a drawer-type sample injection module eliminates environmental air pollution and human interference during the placement and volatilization process of the fugitive source sample, thereby improving monitoring precision with respect to volatile components of fugitive sources.

Description

A box-type controllable high-precision characterization system for volatile components of fugitive sources

[0001] This application claims priority to a Chinese patent application filed with the Patent Office of China on February 22, 2024, with application number 202410194733.7 and invention name “A box-type controllable high-precision characterization system for volatile components of fugitive sources”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present invention relates to the field of atmospheric pollutant monitoring, and in particular to a box-type controllable high-precision characterization system for volatile components of a fugitive source. Background Art

[0003] The main sources of ambient air pollutants include industrial emissions, motor vehicle emissions, natural sources, and domestic sources. With the continuous improvement of emission standards and the implementation of the "Dual Carbon" initiative, industrial and motor vehicle emissions have shown a rapid downward trend. However, fugitive emissions, represented by volatile chemicals (VCPs), have increasingly contributed to atmospheric pollutants, particularly volatile organic compounds (VOCs). These primarily include fugitive emissions from chemical products such as paints, inks, adhesives, pesticides, personal care products, and cleaning products during use. VOCs are organic chemicals with a vapor pressure above 13.3 Pa and a boiling point below 260°C under normal conditions (20°C, 101.3 kPa). Studies have shown that fugitive emissions from VCPs and other fugitive sources can contribute over 30% to anthropogenic VOCs, even exceeding the contribution of motor vehicle emissions in some major cities. They also contribute approximately 50% to the formation of anthropogenic secondary organic aerosols.

[0004] Fugitive sources refer to fugitive emissions from open liquid surfaces of equipment used to collect and store production materials containing volatile organic compounds, as well as fugitive emissions from open liquid surfaces of facilities used to collect, store, and purify production process wastewater and waste liquids containing volatile organic compounds. The volatile components emitted by fugitive sources vary widely. Taking VOCs as an example, they can be divided into multiple categories such as alkanes, alkenes, aromatic hydrocarbons, alcohols, aldehydes, and esters. The chemical reactivity and toxicological properties of different components vary greatly, and their impacts on atmospheric chemistry and human health also differ by orders of magnitude. In order to better quantify the emissions of volatile components from fugitive sources, and on this basis, conduct refined simulations of secondary atmospheric pollutants and predictions of human health impacts, it is necessary to conduct in-depth research on the volatile components and emission characteristics of each fugitive source.

[0005] In the past, headspace analysis was typically used to measure the composition of fugitive source emissions. The fugitive source sample was placed in a constant temperature, sealed container, and allowed to stand for a period of time until the volatile state stabilized. The composition of the air above the sealed container was then analyzed to obtain information on the volatile components of the fugitive source emissions. Due to factors such as differences in the ratio of raw materials and the volatility of different components, there are significant differences in the volatilization rates of different components in fugitive source emissions, resulting in the emission composition being significantly affected by the volatilization time and ambient temperature. The headspace analysis method aims to characterize the composition of the sample after the volatile state reaches a stable state and does not involve composition changes on a time scale. At the same time, to ensure representative sampling, a constant ambient temperature needs to be maintained, making it impossible to use this method to study the changing characteristics of the composition of volatile components of fugitive sources over time and temperature. In addition, for fugitive sources that are highly volatile and have significant instantaneous emissions, the concentration in the headspace region of the container can easily exceed the instrument's measurement range and linear response range. At the same time, it is difficult to eliminate interference from ambient air during the sample placement process, posing a significant challenge to component analysis.

[0006] In summary, current research on the emission characteristics and composition of fugitive sources still has significant deficiencies: 1. A large number of new fugitive products, such as volatile chemicals, enter the market each year, but research on the measurement of their volatile components lags far behind. 2. The volatile components emitted by fugitive sources are significantly affected by ambient temperature, and their emission characteristics vary over different timescales. However, current research on the variation in emission composition of fugitive sources over different timescales and temperatures is insufficient.

[0007] Summary of the Invention

[0008] The purpose of the present invention is to provide a box-type controllable high-precision characterization system for volatile components of fugitive sources, which can improve the monitoring accuracy of volatile components of fugitive sources.

[0009] To achieve the above objectives, the present invention provides a box-type controllable high-precision characterization system for volatile components of fugitive sources, comprising the following modules.

[0010] The volatile dilution module is used to provide a volatilization space for the fugitive source sample and to introduce a mixed gas into the volatilization space to dilute the volatile components in the fugitive source sample; the mixed gas only includes oxygen and nitrogen.

[0011] The climate chamber temperature control module is connected to the volatilization dilution module and is used to control the ambient temperature during the volatilization process of the fugitive source sample.

[0012] The drawer-type sampling module is connected to the volatilization dilution module and is used to deliver the fugitive source sample into the volatilization space.

[0013] The fugitive source component monitoring module is connected to the volatilization dilution module and is used to monitor the concentration of volatile components in the gas after the fugitive source sample is volatilized.

[0014] In one embodiment, the volatility dilution module includes: a volatility box device, a zero air supply device, a gas flow control device, a first sampling tube, and a second sampling tube.

[0015] The volatilization box equipment is used to provide a volatilization space for the fugitive source sample.

[0016] The zero air supply device is connected to the gas flow control device through the first sampling pipe, and the gas flow control device is connected to the volatility box device through the second sampling pipe.

[0017] The zero air supply device is used to provide mixed gas to the volatility box device through the gas flow control device.

[0018] The gas flow control device is used to adjust the flow of the mixed gas entering the volatilization box device.

[0019] In one embodiment, the gas flow control device is a mass flow controller.

[0020] In one embodiment, the volatility box device includes: a flexible sampling bag, a sampling bag support frame, and a spring hook.

[0021] The flexible sampling bag is connected to the gas flow control device through the second sampling tube; the interior of the flexible sampling bag is a volatilization space for the fugitive source sample.

[0022] The spring hook is used to fix the outer corner of the flexible sampling bag and the inner corner of the sampling bag support outer frame, so that the flexible sampling bag is hung inside the sampling bag support outer frame.

[0023] In one embodiment, the flexible sampling bag is a cubic sampling bag made of PFA-PTFE material; and the sampling bag support outer frame is a cubic metal frame.

[0024] In one embodiment, the climate chamber temperature control module includes: a climate chamber device, an air inlet pipe, an air outlet pipe, an air circulation device, a compression cooling device, an electric heating device, a temperature sensor and a temperature control unit.

[0025] The volatility box device is located inside the climate box device.

[0026] The temperature sensor is located at the inner bottom of the climate chamber device, and is used to detect the temperature inside the climate chamber device in real time.

[0027] The air circulation device is connected to the interior of the climate box device through the air inlet pipe and the air outlet pipe, and is respectively connected to the compression cooling device and the electric heating device; the air circulation device is used to circulate air inside the climate box device through the air inlet pipe and the air outlet pipe.

[0028] The temperature control unit is respectively connected to the temperature sensor, the air circulation device, the compression cooling device and the electric heating device. The temperature control unit is used to control the ventilation volume of the air circulation device according to the temperature in the climate chamber device, and control the operating status of the compression cooling device and the electric heating device to adjust the air temperature in the climate chamber device.

[0029] In one embodiment, the drawer-type sampling module includes: a sealing door frame, a circular sealing door, a sampling drawer, and a lever pressure screw.

[0030] The sealing door frame is sealed and embedded in the flexible sampling bag.

[0031] The sealing door frame and the sampling drawer are both fixed to the circular sealing door via the lever pressure screws.

[0032] The interior of the sampling drawer carries the fugitive source sample, and the sampling drawer is used to deliver the fugitive source sample into the flexible sampling bag.

[0033] In one embodiment, the sealing door frame, the circular sealing door, and the sampling drawer are all made of PFA-PTFE.

[0034] In one embodiment, the fugitive source component monitoring module includes: a component monitoring device and a third sampling tube; the component monitoring device is connected to the volatilization space of the volatilization dilution module through the third sampling tube, and the component monitoring device is used to monitor the concentration of volatile components in the gas after the fugitive source sample is volatilized.

[0035] In one embodiment, the emission source component monitoring module further includes a drainage pump and a fourth sampling tube; the drainage pump is connected to the component monitoring device through the fourth sampling tube; the drainage pump is used to extract the volatilized gas from the volatilization space of the volatilization dilution module.

[0036] According to the specific embodiments provided by the present invention, the present invention discloses the following technical effects: the present invention provides a volatilization space for the fugitive source sample through a volatilization dilution module, and introduces a mixed gas into the volatilization space to dilute the volatile components in the fugitive source sample, thereby ensuring that the fugitive source sample continues to volatilize for a long time without being affected. The ambient temperature during the volatilization process of the fugitive source sample can be accurately controlled by the climate chamber temperature control module, providing support for studying the changing characteristics of the volatile component composition of the fugitive source emission with time and temperature. The drawer-type sampling module can eliminate ambient air pollution and human interference during the placement and volatilization of the fugitive source sample, ensure the stable volatilization of the fugitive source sample in the volatilization space during the long sampling process, ensure that the component measurement results are representative of the fugitive source emission characteristics, and thereby improve the monitoring accuracy of the volatile components of the fugitive source.

[0037] Figures in the specification

[0038] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0039] FIG1 is a schematic diagram of a box-type controllable high-precision characterization system for volatile components of a fugitive source provided by the present invention.

[0040] Explanation of symbols: 11-Volatization box equipment, 12-Zero air supply equipment, 13-Gas flow control equipment, 14-First sampling tube, 15-Second sampling tube, 16-Flexible sampling bag, 17-Sampling bag support outer frame, 18-Spring hook, 19-Sealed door frame support lever, 21-Climate chamber equipment, 22-Inlet pipe, 23-Outlet pipe, 24-Air circulation equipment, 25-Compression cooling equipment, 26-Electric heating equipment, 27-Temperature sensor, 28-Temperature control unit, 31-Sealed door frame, 32-Circular sealed door, 33-Sampling drawer, 34-Lever pressure screw, 41-Component monitoring equipment, 42-Third sampling tube, 43-Inlet sampling tube of component monitoring equipment, 44-Drainage pump, 45-Fourth sampling tube. DETAILED DESCRIPTION

[0041] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0042] The purpose of the present invention is to provide a box-type controllable high-precision characterization system for volatile components of fugitive sources. By setting up a volatilization dilution module and a climate chamber temperature control module, on the one hand, it provides measurement conditions for the long-term and continuous volatilization of fugitive source samples, and on the other hand, it accurately controls the volatilization temperature of the fugitive source samples. In conjunction with a fast-response component monitoring device, it provides support for studying the changing characteristics of the volatile component composition of fugitive source emissions with time and temperature. At the same time, it can also solve the problems of concentration exceeding the limit and ambient air interference through sample dilution and optimized sampling methods.

[0043] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0044] The box-type, controllable, high-precision characterization system for volatile components from fugitive sources provided by the present invention includes a volatile dilution module, a climate chamber temperature control module, a drawer-type sampling module, and a fugitive component monitoring module. Required instruments can be added later based on the needs of relevant research or experiments.

[0045] (1) The volatile dilution module is used to provide a volatilization space for the fugitive source sample and introduce a mixed gas into the volatilization space to dilute the volatile components in the fugitive source sample. The mixed gas includes oxygen and nitrogen. The volume ratio of oxygen to nitrogen is approximately 1:4.

[0046] Specifically, as shown in Figure 1, the volatile dilution module includes: a volatile chamber 11, a zero air supply 12, a gas flow control device 13, a first sampling tube 14, and a second sampling tube 15. Both the first sampling tube 14 and the second sampling tube 15 are made of perfluoroalkoxy-polytetrafluoroethylene (PFA-PTFE). The diameter and length of the first sampling tube 14 and the second sampling tube 15 are flexibly determined based on site conditions.

[0047] The volatilization box device 11 is used to provide a volatilization space for the fugitive source sample.

[0048] The zero air supply device 12 is connected to the gas flow control device 13 through the first sampling pipe 14 , and the gas flow control device 13 is connected to the volatility box device 11 through the second sampling pipe 15 .

[0049] The zero air supply device 12 is used to provide mixed gas to the volatility box device 11 through the gas flow control device 13 .

[0050] The gas flow control device 13 is used to adjust the flow rate of the mixed gas entering the volatility box device 11. In a specific embodiment, the gas flow control device 13 is a mass flow controller that can adjust the pressure difference between the inlet and outlet to precisely control the flow rate of the gas with an accuracy of at least 1% of the maximum controlled flow rate.

[0051] In this embodiment, the volatility box device 11 includes a flexible sampling bag 16, a sampling bag support frame 17, and a spring hook 18. The flexible sampling bag 16 is a cube-shaped sampling bag made of PFA-PTFE material, with its length, width, and height dimensions flexibly determined based on demand. The sampling bag support frame 17 is a cube-shaped metal frame with length, width, and height dimensions slightly larger than those of the flexible sampling bag 16.

[0052] The flexible sampling bag 16 is connected to the gas flow control device 13 through the second sampling tube 15. The interior of the flexible sampling bag 16 is a volatilization space for the fugitive source sample, that is, the fugitive source sample volatilizes inside the flexible sampling bag 16.

[0053] The spring hook 18 is a spring with hooks at both ends, used to secure the outer corners of the flexible sampling bag 16 to the inner corners of the sampling bag support frame 17, allowing the flexible sampling bag 16 to be suspended within the sampling bag support frame 17 and providing a certain amount of shrinkage space for the flexible sampling bag 16. The spring hook 18 is a detachable design that can be adjusted according to different experimental needs and facilitates the cleaning and replacement of the flexible sampling bag 16.

[0054] The flexible sampling bag 16 itself has a certain elasticity and a certain space for contraction and expansion, and can be used to carry out dynamic volatilization and static accumulation tests of the fugitive source, thereby identifying the emission characteristics.

[0055] In addition, the volatilization and dilution module further includes a sealing door frame supporting lever 19 .

[0056] The volatile dilution module provided by the present invention can simulate the dynamic volatilization conditions of a fugitive source by continuously providing dilution zero air. This ensures that the fugitive source sample continues to volatilize for a long time without being affected, providing sampling conditions for recording the time-varying concentration of volatile components emitted by the fugitive source. Furthermore, the volatile dilution module can adjust the dilution ratio by controlling the supply flow rate of zero air, effectively preventing the problem of excessive volatile component concentration and improving the accuracy of component concentration measurement.

[0057] (2) A climate chamber temperature control module is connected to the volatilization dilution module, and the climate chamber temperature control module is used to control the ambient temperature during the volatilization process of the fugitive source sample.

[0058] Specifically, the climate chamber temperature control module includes: a climate chamber device 21 , an air inlet pipe 22 , an air outlet pipe 23 , an air circulation device 24 , a compression cooling device 25 , an electric heating device 26 , a temperature sensor 27 and a temperature control unit 28 .

[0059] The volatility chamber 11 is located within the climate chamber 21. The climate chamber 21 is a box-like structure made of insulating material, with an open front to house the volatility chamber 11. The interior space is equipped with an air inlet and outlet, which connect to the air inlet pipe 22 and air outlet pipe 23, respectively, to achieve one-way circulation of air within the climate chamber 21.

[0060] The air inside the flexible sampling bag 16 is sealed and connected to the first sampling tube 14 and the third sampling tube 42, and is independent of and undisturbed by the air inside the climate chamber 21. The climate chamber 21 has holes on both sides for the first sampling tube 14 and the third sampling tube 42 to pass through.

[0061] The temperature sensor 27 is located at the inner bottom of the climate chamber device 21 . The temperature sensor 27 is used to detect the temperature inside the climate chamber device 21 in real time.

[0062] The air circulation device 24 is connected to the interior of the climate chamber 21 through the air inlet pipe 22 and the air outlet pipe 23, and is respectively connected to the compression cooling device 25 and the electric heating device 26. The air circulation device 24 is used to circulate air inside the climate chamber 21 through the air inlet pipe 22 and the air outlet pipe 23.

[0063] As a specific embodiment, the air circulation device 24 is a fan. The fan delivers temperature-controlled air into the climate chamber device 21 through the air inlet pipe 22, achieving a one-way circulation of air between the climate chamber device 21 and the volatilization chamber device 11. The air is then discharged through the air outlet pipe 23, ensuring that the temperature inside the climate chamber device 21 remains stable, thereby achieving the purpose of accurately controlling the temperature inside the flexible sampling bag 16.

[0064] The compression cooling device 25 uses air as a heat exchange medium, with the heat being carried away by the air. When ambient room air enters the compression cooling device 25, the heat from the indoor air is quickly transferred to the aluminum alloy core, which has excellent thermal conductivity. The air then flows through the air duct at high speed, forcibly carrying away the heat, lowering the indoor air temperature. The cooled air then flows through the air circulation device 24 into the climate chamber 21, thereby lowering the temperature inside the climate chamber 21.

[0065] The electric heating device 26 is a device that allows electric current to pass through a resistance wire to generate heat to heat the air. It has the advantages of uniform heating, stable heat supply, high efficiency, compact structure, sensitive response and easy automatic control. The air with increased temperature enters the interior of the climate chamber device 21 through the air circulation device 24, thereby achieving the purpose of increasing the temperature inside the climate chamber device 21.

[0066] The temperature control unit 28 is connected to the temperature sensor 27, the air circulation device 24, the compression cooling device 25, and the electric heating device 26. Specifically, one end of the compression cooling device 25 is connected to the air circulation device 24, and the other end is connected to the temperature control unit 28. The electric heating device 26 is connected to the air circulation device 24, and the other end is connected to the temperature control unit 28.

[0067] The temperature control unit 28 is used to control the ventilation volume of the air circulation device 24 according to the temperature in the climate chamber device 21, and control the operating status of the compression cooling device 25 and the electric heating device 26, so as to timely adjust the air temperature in the climate chamber device 21, more stably control the temperature conditions during the volatilization of the fugitive source sample, thereby affecting the volatilization of the fugitive source sample in the flexible sampling bag 16, avoiding the interference of changes in the external ambient temperature on the volatilization process and concentration measurement, and ensuring the stable measurement of the fugitive source sample components. At the same time, the volatilization rate of the fugitive source sample components can be affected by controlling the temperature, and the emission characteristics and laws of the fugitive source sample components under different temperature conditions can be studied.

[0068] In addition, the temperature control unit 28 is also used to display the temperature inside the climate box device 21 in real time through a display panel.

[0069] The temperature control module of the climate chamber provided in the present invention can accurately control the volatilization temperature of the fugitive source sample by adjusting the temperature and flow of the one-way circulating gas, providing support for studying the changing characteristics of the volatile component composition of the fugitive source emissions with time and temperature.

[0070] (3) A drawer-type sampling module is connected to the volatilization dilution module, and the drawer-type sampling module is used to deliver the fugitive source sample into the volatilization space.

[0071] Specifically, the drawer-type sample introduction module includes: a sealed door frame 31, a circular sealed door 32, a sample introduction drawer 33, and a lever pressure screw 34. There are multiple lever pressure screws 34. Preferably, the sealed door frame 31, the circular sealed door 32, and the sample introduction drawer 33 are all made of PFA-PTFE material.

[0072] The sealing door frame 31 is sealed and embedded in the flexible sampling bag 16, and the embedding part is sealed. Specifically, the sealing door frame 31 is connected to the sealing door frame support lever 19 in the volatilization dilution module to ensure fixed support.

[0073] The sealing door frame 31 and the sample drawer 33 are both fixed to the circular sealing door 32 by the lever pressure screws 34. Specifically, the circular sealing door 32 is fixed to the sealing door frame 31 by four lever pressure screws 34. The edge of the circular sealing door 32 contacts and fits with the plate of the sealing door frame 31 to provide a pressure seal.

[0074] The sampling drawer 33 is a hollow cuboid hollowed out in the middle of the circular sealing door 32. The sampling drawer 33 carries the fugitive source sample and is used to deliver the fugitive source sample into the flexible sampling bag 16.

[0075] The outer area of ​​the sample drawer 33 needs to be slightly larger than the hollowed-out area of ​​the circular sealing door 32 to ensure a tight seal. The sample drawer 33 uses the same lever pressure screw 34 to press against the outside of the drawer, providing a pressure seal. The lever pressure screw 34 is a fixing device that ensures the drawer-style sample module is sealed.

[0076] The drawer-type sampling module provided in the present invention can eliminate environmental air pollution and human interference during the placement and volatilization of fugitive source samples, ensure the stable volatilization of fugitive source samples in the flexible sampling bag 16 during long-term sampling, and ensure that the component measurement results are representative of the fugitive source emission characteristics.

[0077] (4) The fugitive source component monitoring module is connected to the volatilization dilution module, and the fugitive source component monitoring module is used to monitor the concentration of volatile components in the gas after the fugitive source sample is volatilized.

[0078] Specifically, the fugitive source component monitoring module includes a component monitoring device 41 and a third sampling tube 42. The component monitoring device 41 is connected to the volatilization space of the volatilization dilution module through the third sampling tube 42, and is used to monitor the concentration of volatile components in the gas after the fugitive source sample is volatilized.

[0079] The component monitoring device's inlet sampling tube 43 is connected to the outlet pipe (third sampling tube 42) of the flexible sampling bag 16 in the volatile dilution module, ensuring that volatile gases from the fugitive source sample can enter the component monitoring device 41. After the volatile gases from the sample are blown out of the flexible sampling bag 16 and enter the component monitoring device 41 through the third sampling tube 42 and the third sampling tube 43, the component monitoring device 41 can quickly obtain real-time concentration information of the measured volatile components from the fugitive source. This high-precision measurement accuracy can reach the order of seconds.

[0080] Furthermore, the component monitoring device 41 has a built-in sampling pump, which can extract sample air from the air flow branch at the outlet of the climate chamber device 21 .

[0081] The component monitoring device 41 can realize high-precision monitoring of the concentrations of volatile components from various escape sources in the atmosphere (such as inorganic gases, gaseous volatile organic compounds, etc.), including but not limited to existing volatile organic compound online monitoring instruments, greenhouse gas online monitoring instruments, etc.

[0082] The emission source component monitoring module also includes a drainage pump 44 and a fourth sampling tube 45. The drainage pump 44 is connected to the component monitoring device 41 via the fourth sampling tube 45. The drainage pump 44 is used to extract the volatilized gas from the volatilization space of the volatilization dilution module. The drainage pump 44 is a low-power rotary vane vacuum pump. Its parameters, such as rated power, maximum sampling flow rate, and maximum vacuum level, can be determined based on actual needs.

[0083] The fourth sampling tube 45 is made of PFA-PTFE material, and its length and diameter are determined according to actual needs.

[0084] Taking personal care products, which are typical of volatile chemicals, as an example, the volatile box device 11 is flushed with zero air at a fixed flow rate through the volatile dilution module to fully remove the residual ambient air in the volatile box device 11. The sample of personal care products is placed in the volatile box device 11 through the drawer-type sampling module. The positive pressure of the volatile box device 11 ensures isolation from the ambient air. The volatile box device 11 is placed in a climate box device 21. The climate box temperature control module controls the ventilation volume of the air circulation, the working status of the compression cooling device 25 and the electric heating device 26 to stably control the temperature conditions during the sample volatilization process. After the volatile components of the sample are diluted by zero air in the volatile box device 11, they are sent to the fugitive source component monitoring module through the sampling tube, and the concentration is measured with a time resolution of 1 second to obtain the emission characteristics of the composition of the sample volatile components affected by time and temperature conditions.

[0085] The present invention overcomes the limitations of existing headspace analysis technology in the analysis of volatile components emitted from fugitive sources. It can measure the volatile components emitted by fugitive products such as volatile chemicals without being disturbed by the external ambient air, characterize the changes in volatile components emitted by fugitive sources over time and temperature, and provide data support for the refined simulation and prediction of secondary atmospheric pollutants. Based on the fact that the current atmospheric pollution control work has gradually progressed from the total amount control of fugitive sources to the control of components, and the current research on the emission characteristics and volatile component composition of fugitive sources represented by volatile chemicals still has significant deficiencies, the present invention may be widely promoted and applied in the future in the fields of updating the atmospheric pollutant emission inventory, and has certain commercial prospects.

[0086] This document uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only intended to help understand the method and core concept of the present invention. At the same time, those skilled in the art will find that the specific implementation methods and application scopes may vary based on the concept of the present invention. In summary, the contents of this specification should not be construed as limiting the present invention.

Claims

1. A box-type controllable high-precision characterization system for volatile components of fugitive sources, characterized by: The box-type controllable high-precision characterization system for volatile components of fugitive sources includes: A volatilization dilution module is used to provide a volatilization space for the fugitive source sample and to introduce a mixed gas into the volatilization space to dilute the volatile components in the fugitive source sample; the mixed gas only includes oxygen and nitrogen; A climate chamber temperature control module, connected to the volatilization dilution module, for controlling the ambient temperature during the volatilization of the fugitive source sample; A drawer-type sampling module, connected to the volatilization dilution module, for delivering the fugitive source sample into the volatilization space; The fugitive source component monitoring module is connected to the volatilization dilution module and is used to monitor the concentration of volatile components in the gas after the fugitive source sample is volatilized.

2. The box-type controllable high-precision characterization system for volatile components of fugitive sources according to claim 1 is characterized in that: The volatilization dilution module includes: a volatilization box device, a zero air supply device, a gas flow control device, a first sampling tube and a second sampling tube; The volatilization box device is used to provide a volatilization space for the fugitive source sample; The zero air supply device is connected to the gas flow control device through the first sampling pipe, and the gas flow control device is connected to the volatility box device through the second sampling pipe; The zero air supply device is used to provide mixed gas to the volatility box device through the gas flow control device; The gas flow control device is used to adjust the flow of the mixed gas entering the volatilization box device.

3. The box-type controllable high-precision characterization system for volatile components of fugitive sources according to claim 2 is characterized in that: The gas flow control device is a mass flow controller.

4. The box-type controllable high-precision characterization system for volatile components of fugitive sources according to claim 2 is characterized in that: The volatility box equipment includes: a flexible sampling bag, a sampling bag support frame and a spring hook; The flexible sampling bag is connected to the gas flow control device through the second sampling tube; The interior of the flexible sampling bag is a volatilization space for the fugitive source sample; The spring hook is used to fix the outer corner of the flexible sampling bag and the inner corner of the sampling bag support outer frame, so that the flexible sampling bag is hung inside the sampling bag support outer frame.

5. The box-type controllable high-precision characterization system for volatile components of fugitive sources according to claim 4 is characterized in that: The flexible sampling bag is a cubic sampling bag made of PFA-PTFE material; the sampling bag support outer frame is a cubic metal frame.

6. The box-type controllable high-precision characterization system for volatile components of fugitive sources according to claim 2 is characterized in that: The climate chamber temperature control module includes: climate chamber equipment, air inlet pipe, air outlet pipe, air circulation equipment, compression cooling equipment, electric heating equipment, temperature sensor and temperature control unit; The volatility box device is located inside the climate box device; The temperature sensor is located at the inner bottom of the climate chamber device, and is used to detect the temperature inside the climate chamber device in real time; The air circulation device is in communication with the interior of the climate chamber device through the air inlet pipe and the air outlet pipe, and is connected to the compression cooling device and the electric heating device respectively; the air circulation device is used to circulate air inside the climate chamber device through the air inlet pipe and the air outlet pipe; The temperature control unit is respectively connected to the temperature sensor, the air circulation device, the compression cooling device and the electric heating device. The temperature control unit is used to control the ventilation volume of the air circulation device according to the temperature in the climate chamber device, and control the operating status of the compression cooling device and the electric heating device to adjust the air temperature in the climate chamber device.

7. The box-type controllable high-precision characterization system for volatile components of fugitive sources according to claim 4 is characterized in that: The drawer-type sampling module includes: a sealing door frame, a circular sealing door, a sampling drawer and a lever pressure screw; The sealing door frame is sealed and embedded in the flexible sampling bag; The sealing door frame and the sampling drawer are both fixed to the circular sealing door by the lever pressure screw; The interior of the sampling drawer carries the fugitive source sample, and the sampling drawer is used to deliver the fugitive source sample into the flexible sampling bag.

8. The box-type controllable high-precision characterization system for volatile components of fugitive sources according to claim 7 is characterized in that: The sealing door frame, the circular sealing door and the sampling drawer are all made of PFA-PTFE.

9. The box-type controllable high-precision characterization system for volatile components of fugitive sources according to claim 1 is characterized in that: The emission source component monitoring module includes: component monitoring equipment and a third sampling tube; The component monitoring device is connected to the volatilization space of the volatilization dilution module through the third sampling tube, and the component monitoring device is used to monitor the concentration of volatile components in the gas after the volatilization of the fugitive source sample.

10. The box-type controllable high-precision characterization system for volatile components of fugitive sources according to claim 9 is characterized in that: The emission source component monitoring module further includes a drainage pump and a fourth sampling tube; The drainage pump is connected to the component monitoring device through the fourth sampling tube; the drainage pump is used to extract the volatilized gas from the volatilization space of the volatilization dilution module.

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