CN117761262A - A box-type controllable and high-precision characterization system for volatile components of fugitive sources - Google Patents

Abstract

The invention provides a box-type controllable and high-precision characterization system for volatile components of fugitive sources, belonging to the field of air pollutant monitoring. The system includes: a volatilization dilution module, used to provide volatilization space for fugitive source samples, and volatilize Mixed gas is introduced into the space to dilute the volatile components of the escape source samples; the climate box temperature control module is used to control the ambient temperature during the volatilization process of the escape source samples; the drawer-type sampling module is used to transfer the escape source samples Sent into the volatilization space; the emission source component monitoring module is used to monitor the concentration of volatile components in the gas after the emission source sample has volatilized. The present invention ensures that the fugitive source sample can continue to evaporate for a long time without being affected through the volatilization dilution module, accurately controls the ambient temperature during the volatilization process of the fugitive source sample through the climate box temperature control module, and eliminates the fugitive source sample through the drawer-type sampling module. Ambient air pollution and human interference during the placement and volatilization process of fugitive source samples have improved the monitoring accuracy of volatile components of fugitive sources.

Description

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

Technical field

The invention relates to the field of air pollutant monitoring, and in particular to a box-type controllable and high-precision characterization system for volatile components of emission sources.

Background technique

The main sources of environmental air pollutants include industrial emission sources, motor vehicle emission sources, natural sources and domestic sources. With the continuous improvement of emission standards, industrial emissions and motor vehicle emissions have shown a rapid downward trend, and emissions from fugitive sources represented by volatile chemicals (Volatile Chemical Products, VCP) have a negative impact on atmospheric pollutants, especially volatile The contribution of volatile organic compounds (VOCs) has gradually become more prominent, mainly including unorganized emissions caused by the evaporation and volatilization of chemical products such as coatings, inks, adhesives, pesticides, personal care products, and cleaning products during use. VOCs refer to organic chemical substances that under normal conditions (20°C, 101.3kPa) have a vapor pressure above 13.3Pa and a boiling point below 260°C. Research shows that emissions from fugitive sources such as VCP can contribute more than 30% to anthropogenic VOCs, even exceeding the contribution of motor vehicle emissions in some large cities, and their contribution to the generation of secondary organic aerosols from anthropogenic sources can reach 50%. %about.

Emission sources refer to the fugitive emissions from the collection and storage of production materials containing volatile organic compounds and the open liquid surfaces of storage equipment, as well as the collection and storage of production process wastewater and waste liquids containing volatile organic compounds and the emissions from the open liquid surfaces of purification treatment facilities. emission. There are various volatile components emitted by fugitive sources. Taking VOCs as an example, they can be divided into various component categories such as alkanes, olefins, aromatic hydrocarbons, alcohols, aldehydes, and esters. The chemical reactivity of different components The toxicological properties are quite different, and the impacts on atmospheric chemistry and human health are also orders of magnitude different. In order to better quantify the emissions of volatile components from fugitive sources, and on this basis, carry out refined simulations of atmospheric secondary pollutants and predict human health impacts, it is necessary to conduct in-depth research on the volatile components and emission characteristics of each fugitive source. .

In the past, the headspace analysis method was usually used to measure the emission components of fugitive sources. Place the fugitive source sample in a constant-temperature sealed container and let it sit for a period of time until the volatilization state stabilizes. Then, conduct a component analysis of the air at the top of the closed container to obtain information on the volatile components emitted by the fugitive source. Due to factors such as differences in the ratio of raw materials and differences in the volatility of different components, there are large differences in the volatilization rates of different components emitted by fugitive sources, which results in the composition of the emissions being greatly affected by 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 the time scale. At the same time, in order to ensure the representativeness of the sampling, a constant ambient temperature needs to be maintained, making it impossible to study emission sources using this method. The composition of volatile components changes with time and temperature. In addition, for emission sources that are highly volatile and have obvious instantaneous emissions, the concentration in the headspace area of the container can easily exceed the measurement range and linear response range of the instrument. At the same time, it is difficult to eliminate the interference of ambient air during the sample placement process, which brings trouble to the analysis of components. Come to a bigger challenge.

In summary, there are still major deficiencies in the current research on the emission characteristics and composition of fugitive sources: 1. A large number of new volatile chemicals and other fugitive products are put into the market every year, but the volatility of their emissions is Research on measuring ingredients lags far behind. 2. The volatile components emitted by fugitive sources are greatly affected by ambient temperature, and their emission characteristics are also different on different time scales. However, there is currently research on the changing characteristics of emission components of fugitive sources on different time scales and at different temperatures. Very inadequate.

Contents of the invention

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

In order to achieve the above objectives, the present invention provides a box-type controllable and high-precision characterization system for volatile components of fugitive sources, which includes the following modules.

A volatilization dilution module is used to provide a volatilization space for the emission source sample, and to pass a mixed gas into the volatilization space to dilute the volatile components in the emission source sample; the mixed gas only includes oxygen and nitrogen.

The climate box temperature control module is connected to the volatilization dilution module and is used to control the ambient temperature during the volatilization process of the emission source sample.

A drawer-type sampling module is connected to the volatilization dilution module and used to send the escape source sample into the volatilization space.

The emission 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 emission source sample has volatilized.

Optionally, the volatilization dilution module includes: volatilization box equipment, zero air supply equipment, gas flow control equipment, a first sampling pipe and a second sampling pipe.

The volatilization box equipment is used to provide volatilization space for the escape 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 volatilization box device through the second sampling pipe.

The zero air supply device is used to provide mixed gas to the volatilization box device through the gas flow control device.

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

Optionally, the gas flow control device is a mass flow controller.

Optionally, the volatilization box device 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 escape source sample.

The spring hook is used to fix the outer corner of the flexible sampling bag and the inner corner of the outer frame of the supporting frame of the sampling bag, so that the flexible sampling bag is suspended inside the outer frame of the supporting frame of the sampling bag.

Optionally, the flexible sampling bag is a cubic sampling bag made of PFA-PTFE material; the supporting outer frame of the sampling bag is a cubic metal frame.

Optionally, the climate box temperature control module includes: climate box equipment, air inlet pipe, air outlet pipe, air circulation equipment, compression cooling equipment, electric heating equipment, temperature sensor and temperature control unit.

The evaporation box device is located inside the climate box device.

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

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

The temperature control unit is connected to the temperature sensor, the air circulation equipment, the compression cooling equipment and the electric heating equipment respectively. The temperature control unit is used to control the temperature in the climate box equipment according to the temperature inside the climate box equipment. The ventilation volume of the air circulation equipment is controlled, and the operating status of the compression cooling equipment and the electric heating equipment are controlled to adjust the air temperature in the climate box equipment.

Optionally, the drawer-type sampling module includes: a sealed door frame, a circular sealed door, a sampling drawer and a lever pressure screw.

The sealed door frame is sealed and embedded in the flexible sampling bag.

The sealing door frame and the sampling drawer are fixed to the circular sealing door through the lever pressure screw.

The inside of the sampling drawer carries the emission source sample, and the sampling drawer is used to send the emission source sample into the flexible sampling bag.

Optionally, the sealing door frame, the circular sealing door and the sampling drawer are all made of PFA-PTFE.

Optionally, the emission 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 The equipment is used to monitor the concentration of volatile components in the gas after the emission source sample has volatilized.

Optionally, 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 collect the components from the The volatilized gas is extracted from the volatilization space of the volatilization dilution module.

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 escape source sample through a volatilization dilution module, and passes mixed gas into the volatilization space to dilute the escape source sample. Volatile components ensure that the fugitive source sample can volatilize continuously for a long time without being affected. The climate chamber temperature control module can accurately control the ambient temperature during the volatilization process of the fugitive source sample, which provides a basis for studying the volatility of fugitive source emissions. The drawer-type sampling module can eliminate ambient air pollution and human interference during the placement and volatilization process of fugitive source samples, and ensure that fugitive source samples are within the volatilization space during long-term sampling processes. The stable volatilization ensures that the component measurement results are representative of the emission characteristics of the fugitive source, thereby improving the monitoring accuracy of the volatile components of the fugitive source.

Description of drawings

In order to explain the embodiments of the present invention or the technical solutions in the prior art more clearly, the drawings needed to be used in the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some of the drawings of the present invention. Embodiments, for those of ordinary skill in the art, other drawings can also be obtained based on these drawings without exerting creative efforts.

Figure 1 is a schematic diagram of a box-type controllable and high-precision characterization system for volatile components of emission sources provided by the present invention.

Symbol description: 11-Volatilization 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 frame , 18-spring hook, 19-sealed door frame support lever, 21-climate box equipment, 22-air inlet pipe, 23-air 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-round sealed door, 33-sampling drawer, 34-lever pressure screw, 41-component monitoring equipment, 42-third sampling tube, 43-component monitoring equipment The air inlet sampling pipe, 44-drainage pump, 45-the fourth sampling pipe.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present invention.

The purpose of the present invention is to provide a box-type controllable and high-precision characterization system for volatile components of fugitive sources. By setting up a volatilization dilution module and a climate box temperature control module, on the one hand, it provides measurement for long-term continuous volatilization of fugitive source samples. Conditions, on the other hand, accurately control the volatilization temperature of the fugitive source sample, and cooperate with fast-response component monitoring equipment to provide support for studying the changing characteristics of the volatile component composition emitted by the fugitive source with time and temperature. It can also be used to dilute the sample and optimized sampling methods to solve the problems of concentration over-limit and ambient air interference.

In order to make the above objects, features and advantages of the present invention more obvious and understandable, the present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments.

The box-type controllable and high-precision characterization system for volatile components of fugitive sources provided by the invention includes: a volatile dilution module, a climate box temperature control module, a drawer-type sampling module and a fugitive source component monitoring module. Subsequently, the required instruments can be added according to the needs of relevant research or experiments.

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

Specifically, as shown in FIG. 1 , the volatilization dilution module includes: a volatilization box device 11 , a zero air supply device 12 , a gas flow control device 13 , a first sampling pipe 14 and a second sampling pipe 15 . The first sampling tube 14 and the second sampling tube 15 are both made of perfluoroalkoxy-polytetrafluoroethylene (Polyfluoroalkoxy-Polytetrafluoroethylene, PFA-PTFE) material. The diameters of the first sampling tube 14 and the second sampling tube 15 are and length can be flexibly determined according to site conditions.

The volatilization box device 11 is used to provide volatilization space for the emission source sample.

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 volatilization box device 11 through the second sampling pipe 15 .

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

The gas flow control device 13 is used to adjust the flow rate of the mixed gas entering the volatilization box device 11 . As a specific implementation, the gas flow control device 13 is a mass flow controller, which can adjust the pressure difference between the inlet and the outlet and accurately control the flow of passing gas with an accuracy of at least 1% of the maximum control flow.

In this embodiment, the volatilization 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 sampling bag made of PFA-PTFE material, and its length, width and height are flexibly determined according to needs. The sampling bag supporting outer frame 17 is a cubic metal frame, and its length, width and height are slightly larger than the dimensions of the flexible sampling bag 16 .

The flexible sampling bag 16 communicates with 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 emission source sample, that is, the emission source sample volatilizes inside the flexible sampling bag 16 .

The spring hook 18 is a spring with hooks at both ends, and is used to fix the outer corner of the flexible sampling bag 16 and the inner corner of the sampling bag support outer frame 17 so that the flexible sampling bag 16 is suspended from the sampling bag support. The inside of the outer frame 17 provides the flexible sampling bag 16 with a certain shrinkage space. The spring hook 18 is detachable and can be adjusted according to different experimental needs, and is convenient for cleaning and replacement of the flexible sampling bag 16 .

The flexible sampling bag 16 itself has a certain elasticity and a certain space for contraction and expansion, and can carry out dynamic volatilization and static accumulation tests of emission sources to identify emission characteristics.

In addition, the volatile dilution module also includes a sealed door frame support lever 19.

The volatilization dilution module set up in the present invention can simulate the dynamic volatilization conditions of the fugitive source by continuously providing dilution zero air, ensuring that the fugitive source sample continues to volatilize for a long time without being affected, which is a good way to record the fugitive source emissions. Emissions that vary in concentration of volatile components over time provide sampling conditions. In addition, the volatile dilution module can adjust the dilution ratio by controlling the supply flow of zero air, which can effectively avoid the problem of volatile component concentration exceeding the limit and improve the accuracy of component concentration measurement.

(2) The climate box temperature control module is connected to the volatilization dilution module. The climate box temperature control module is used to control the ambient temperature during the volatilization process of the escape source sample.

Specifically, the climate box temperature control module includes: climate box equipment 21, air inlet pipe 22, air outlet pipe 23, air circulation equipment 24, compression cooling equipment 25, electric heating equipment 26, temperature sensor 27 and temperature control unit 28.

The evaporation box device 11 is located inside the climate box device 21 . The climate box device 21 is a box-type structure made of thermal insulation material, and the front can be opened to put the evaporation box device 11 into it. The internal space is equipped with an air inlet divergence port and an air outlet air collection port, which are connected to the air inlet pipe 22 and the air outlet pipe 23 respectively to realize one-way circulation of air inside the climate box device 21.

The internal air of the flexible sampling bag 16 is sealed with the first sampling pipe 14 and the third sampling pipe 42, and is independent of the internal air of the climate box device 21 without interference. Holes are drilled on both sides of the climate box device 21 for the first sampling pipe 14 and the third sampling pipe 42 to pass.

The temperature sensor 27 is located at the inner bottom of the climate box device 21 , and is used to detect the temperature inside the climate box device 21 in real time.

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

As a specific implementation, the air circulation device 24 is a fan. The fan sends the temperature-controlled air into the interior of the climate box device 21 through the air inlet pipe 22 to realize one-way gas circulation between the climate box device 21 and the volatilization box device 11, and is discharged from the air outlet pipe 23 to ensure that the air inside the climate box device 21 is The temperature is in a stable state, achieving the purpose of accurately controlling the temperature in the flexible sampling bag 16 .

The compression cooling device 25 uses air as a heat exchange medium to exchange heat, and the heat is taken away through the air. When the indoor air in the room enters the compression cooling device 25, the heat of the indoor air is quickly transferred to the aluminum alloy core with good thermal conductivity. The air passes through the wind channel at high speed and forcibly takes away the heat, causing the temperature of the indoor air to decrease. After the temperature decreases, The air enters the inside of the climate box device 21 through the air circulation device 24 to achieve the purpose of reducing the temperature inside the climate box device 21.

The electric heating device 26 is a device that heats the air by heating current through a resistance wire. It has the advantages of uniform heating, stable heat supply, high efficiency, compact structure, sensitive response, and easy automatic control. The air after the temperature rises through the air The circulation device 24 enters the inside of the climate box device 21 to achieve the purpose of raising the temperature inside the climate box device 21 .

The temperature control unit 28 is connected to the temperature sensor 27, the air circulation device 24, the compression cooling device 25 and the electrothermal heating device 26 respectively. That is, 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 . One end of the electrothermal heating device 26 is connected to the air circulation device 24 and the other end is connected to the temperature control unit 28 .

The temperature control unit 28 is used to control the ventilation of the air circulation device 24 according to the temperature in the climate box device 21, and control the operating status of the compression cooling device 25 and the electric heating device 26, so as to The air temperature in the climate box device 21 is adjusted in time to more stably control the temperature conditions when the escape source sample volatilizes, thereby affecting the volatilization of the escape source sample in the flexible sampling bag 16 and avoiding the impact of changes in the external ambient temperature. On the basis of ensuring the stable measurement of the components of the fugitive source sample due to the interference of the volatilization process and concentration measurement, the temperature can also be controlled to affect the volatilization rate of the fugitive source sample components, and the variation of the fugitive source sample components under different temperature conditions can be studied. Emission characteristics and patterns.

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

The climate box temperature control module provided by the present invention can accurately control the volatilization temperature of the escape source sample by adjusting the temperature and flow rate of the one-way circulating gas, and provides a method for studying the changing characteristics of the volatile components emitted by the escape source with time and temperature. support.

(3) The drawer-type sampling module is connected to the volatilization dilution module, and the drawer-type sampling module is used to send the escape source sample into the volatilization space.

Specifically, the drawer-type sampling module includes: a sealed door frame 31 , a circular sealed door 32 , a sampling drawer 33 and a lever pressure screw 34 . The number of lever pressure screws 34 is multiple. Preferably, the sealing door frame 31 , the circular sealing door 32 and the sampling drawer 33 are all made of PFA-PTFE material.

The sealing door frame 31 is sealed and inlaid on the flexible sampling bag 16, and the inlay is well sealed. Specifically, the sealing door frame 31 is connected to the sealing door frame support lever 19 in the volatile dilution module to ensure fixed support.

The sealing door frame 31 and the sampling drawer 33 are fixed to the circular sealing door 32 through the lever pressure screw 34 . Specifically, the circular sealing door 32 and the sealing door frame 31 are fixed by four lever pressure screws 34. The edge of the circular sealing door 32 is in contact with the plate of the sealing door frame 31 to provide pressure sealing.

The sampling drawer 33 is a hollow rectangular parallelepiped designed to be hollowed out in the middle of the circular sealing door 32 . The inside of the sampling drawer 33 carries the emission source sample, and the sampling drawer 33 is used to send the emission source sample into the flexible sampling bag 16 .

The external area of the sampling drawer 33 needs to be slightly larger than the hollowed-out area in the middle of the circular sealing door 32 to ensure sealing. The sampling drawer 33 uses the same lever pressure screw 34 to press the outside of the drawer to provide a pressure seal. The lever pressure screw 34 is a fixing device to ensure the sealing of the drawer-type sampling module.

The drawer-type sampling module provided by the present invention can eliminate ambient air pollution and human interference during the placement and volatilization process of the fugitive source sample, ensure the stable volatilization of the fugitive source sample in the flexible sampling bag 16 during the long-term sampling process, and ensure the composition of the fugitive source sample. The measurement results are representative of the emission characteristics of the fugitive source.

(4) The emission source component monitoring module is connected to the volatilization dilution module. The emission source component monitoring module is used to monitor the concentration of volatile components in the gas after the emission source sample has volatilized.

Specifically, the emission 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. The component monitoring device 41 is used to monitor the concentration of volatile components in the gas after volatilization of the emission source sample. .

The inlet sampling pipe 43 of the component monitoring device is connected to the gas outlet pipe (third sampling pipe 42 ) of the flexible sampling bag 16 in the volatile dilution module to ensure that the volatile gas from the escape source sample can enter the component monitoring device 41 . The gas emitted by the sample is blown out of the flexible sampling bag 16 and enters the component monitoring device 41 through the third sampling tube 42. The component monitoring device 41 can quickly obtain the measured evaporation source volatilization in real time. Concentration information of sexual components, its high accuracy means that the accuracy of time measurement can be on the order of seconds.

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 .

The component monitoring equipment 41 can realize high-precision monitoring of the concentration of volatile components from various emission sources in the atmosphere (such as inorganic gases, gaseous volatile organic compounds, etc.), including but not limited to existing online monitoring instruments for volatile organic compounds and online greenhouse gases. Monitoring instruments, etc.

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 through the fourth sampling pipe 45 . The drainage pump 44 is used to extract volatilized gas from the volatilization space of the volatilization dilution module. The drainage pump 44 is a low-power rotary vane vacuum pump, and its rated power, maximum sampling flow rate, maximum vacuum degree and other parameters can be determined according to actual needs.

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

Taking the more typical personal care products among volatile chemicals as an example, zero air is flushed through the volatilization box device 11 at a fixed flow rate through the volatilization dilution module to fully remove the residual ambient air in the volatilization box device 11. The samples of personal care products pass through the drawer. The sampling module is placed in the evaporation box device 11. The positive pressure of the evaporation box device 11 ensures isolation from the ambient air. The volatilization box device 11 is placed in the 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 with zero air in the volatilization box device 11, they are sent to the emission source component monitoring module through the sampling tube, and the concentration is measured with a time resolution of 1 second to obtain the composition of the volatile components of the sample over time. Emission characteristics affected by time and temperature conditions.

The present invention makes up for the limitations of the existing headspace analysis technology in the analysis process of volatile components emitted by fugitive sources, and can carry out analysis of emissions of fugitive products such as volatile chemicals without being interfered by external ambient air. The measurement of volatile components characterizes the changes in volatile components emitted by fugitive sources with time and temperature, and provides data support for refined simulation and prediction of atmospheric secondary pollutants. Based on the fact that the current air pollution control work has gradually advanced from the total amount control of fugitive sources to the composition control, and there are still major deficiencies in the current research on the emission characteristics and volatile component composition of fugitive sources represented by volatile chemicals, etc. , this invention may be widely promoted and applied in fields such as updating air pollutant emission inventories in the future, and has certain commercial prospects.

This article uses specific examples to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method and the core idea of the present invention; at the same time, for those of ordinary skill in the art, according to the present invention There will be changes in the specific implementation methods and application scope of the ideas. In summary, the contents of this description should not be construed as limitations of the present invention.

Claims (8)

1. the utility model provides a controllable high accuracy characterization system of loss source volatile composition of box, its characterized in that, the controllable high accuracy characterization system of loss source volatile composition of box includes:

The evaporation dilution module is used for providing an evaporation space for the dissipation source sample and introducing mixed gas into the evaporation space so as to dilute volatile components in the dissipation source sample; the mixed gas only comprises oxygen and nitrogen;

The volatilization diluting module comprises: the device comprises a volatilizing 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 for providing a volatilization space for the dissipation source sample; the zero air supply device is communicated with the gas flow control device through the first sampling pipe, and the gas flow control device is communicated with the volatilizing box device through the second sampling pipe; the zero air supply device is used for providing mixed gas for the volatilizing box device through the gas flow control device; the gas flow control device is used for adjusting the flow of the mixed gas entering the volatilizing box device;

The volatilization box device comprises: the flexible sampling bag, the sampling bag supporting outer frame and the spring hook; the flexible sampling bag is communicated with the gas flow control device through the second sampling pipe; the inside of the flexible sampling bag is a volatilization space for dissipation source samples; the spring hook is used for fixing the outer corner of the flexible sampling bag and the inner corner of the sampling bag supporting outer frame, so that the flexible sampling bag is suspended in the sampling bag supporting outer frame;

The climate box temperature control module is connected with the volatilization diluting module and used for controlling the ambient temperature in the volatilization process of the dissipation source sample;

The drawer type sample injection module is connected with the volatilization dilution module and used for sending the dissipation source sample into the volatilization space;

and the dissipation source component monitoring module is connected with the volatilization diluting module and is used for monitoring the concentration of volatile components in the gas after the dissipation source sample volatilizes.

2. The box-type emission source volatile component controllable high-precision characterization system according to claim 1, wherein the gas flow control device is a mass flow controller.

3. The box-type escape source volatile component controllable high-precision characterization system according to claim 1, wherein the flexible sampling bag is a square sampling bag made of PFA-PTFE material; the sampling bag support outer frame is a cube metal frame.

4. The box-type emission source volatile component controllable high-precision characterization system according to claim 1, wherein the climate box temperature control module comprises: the air conditioner comprises climate box equipment, an air inlet pipe, an air outlet pipe, air circulation equipment, compression cooling equipment, electric heating equipment, a temperature sensor and a temperature control unit;

The volatilizing box equipment is positioned inside the climatic box equipment;

The temperature sensor is positioned at the inner bottom of the climatic chamber equipment and is used for detecting the temperature in the climatic chamber equipment in real time;

The air circulation device is communicated with the inside of the climatic box device through the air inlet pipe and the air outlet pipe and is respectively connected with the compression cooling device and the electric heating device; the air circulation device is used for performing air circulation on the inside of the climatic box device through the air inlet pipe and the air outlet pipe;

The temperature control unit is respectively connected with the temperature sensor, the air circulation device, the compression cooling device and the electric heating device, and is used for controlling the ventilation quantity of the air circulation device according to the temperature in the climatic box device and controlling the running states of the compression cooling device and the electric heating device so as to adjust the air temperature in the climatic box device.

5. The box-type emission source volatile component controllable high-precision characterization system according to claim 1, wherein the drawer-type sample injection module comprises: sealing door frame, round sealing door, sample feeding drawer and lever pressure screw;

The sealed door frame is hermetically inlaid on the flexible sampling bag;

The sealing door frame and the sample introduction drawer are fixed with the circular sealing door through the lever pressure screw;

the inside of the sample introduction drawer bears the escape source sample, and the sample introduction drawer is used for sending the escape source sample into the flexible sampling bag.

6. the system of claim 5, wherein the sealed door frame, the circular sealed door, and the sample drawer are all PFA-PTFE.

7. The box-type emission source volatile component controllable high-precision characterization system according to claim 1, wherein the emission source component monitoring module comprises: component monitoring equipment and a third sampling tube;

The component monitoring equipment is communicated with the volatilization space of the volatilization dilution module through the third sampling pipe and is used for monitoring the concentration of volatile components in the gas after the dissipation source sample volatilizes.

8. the box-type escape source volatile component controllable high-precision characterization system according to claim 7, wherein the escape source component monitoring module further comprises a drainage pump and a fourth sampling tube;

the drainage pump is connected with the component monitoring equipment through the fourth sampling pipe; the drainage pump is used for extracting volatilized gas from the volatilization space of the volatilization diluting module.