CN117761262B - Box-type escape source volatile component controllable high-precision characterization system - Google Patents
Box-type escape source volatile component controllable high-precision characterization system Download PDFInfo
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Abstract
The invention provides a box-type escape source volatile component controllable high-precision characterization system, which belongs to the field of atmospheric pollutant monitoring, and comprises: 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 the volatile components of the dissipation source sample; the climate box temperature control module is used for controlling the ambient temperature in the volatilization process of the dissipation source sample; the drawer type sample injection module is used for sending the dissipation source sample into the volatilization space; and the dissipation source component monitoring module is used for monitoring the concentration of volatile components in the gas after the dissipation source sample volatilizes. According to the invention, the long-time continuous volatilization of the dissipation source sample is ensured under the condition of no influence by the volatilization dilution module, the environmental temperature in the volatilization process of the dissipation source sample is accurately controlled by the climate box temperature control module, the environmental air pollution and the artificial interference in the placement and volatilization process of the dissipation source sample are eliminated by the drawer type sample injection module, and the monitoring precision of the dissipation source volatile component is improved.
Description
Technical Field
The invention relates to the field of atmospheric pollutant monitoring, in particular to a box-type escape source volatile component controllable high-precision characterization system.
Background
Major sources of environmental atmospheric pollutants include industrial emissions sources, automotive emissions sources, natural sources, and living sources, among others. With the increasing emission standards, industrial emissions and automotive emissions have shown a rapid decline, while emissions from emissions sources, represented by volatile chemicals (Volatile Chemical Product, VCP), are increasingly contributing to atmospheric pollutants, especially to volatile organic compounds (volatile organic compounds, VOCs), mainly including the emissions from the emissions of chemical products such as paints, inks, adhesives, pesticides, personal care products, cleaning products, etc. during use. VOCs refer to organic chemicals having a vapor pressure of 13.3Pa or more and a boiling point of 260 ℃ or less in a normal state (20 ℃ C., 101.3 kPa). Researches show that the contribution of VCP and other escape source emissions to artificial source VOCs can reach more than 30%, and the contribution to the generation of artificial source secondary organic aerosols can reach about 50% in certain large cities even beyond the contribution of motor vehicle emissions.
The emission source refers to the emission of the open liquid surface of the collection and storage equipment of the production materials containing volatile organic matters, the collection and storage of the production process wastewater and waste liquid containing volatile organic matters and the emission of the open liquid surface of the purification treatment facility. Volatile components discharged by the dissipation source are various, and the volatile components can be classified into various component types such as alkanes, alkenes, aromatic hydrocarbons, alcohols, aldehydes and esters, and the like, so that the chemical reactivity and the toxicological property of different components are greatly different, and the influence on the atmospheric chemistry, the human health and the like is also in order of magnitude. In order to better quantify the emission of volatile components of the emission sources, and develop a refined simulation of secondary pollutants in the atmosphere and prediction of human health influence on the basis of the emission of the volatile components of the emission sources, intensive researches on the volatile components and emission characteristics of the emission sources are required.
The prior art emission component measurement of the emission source generally employs a headspace analysis method. And placing the dissipation source sample in a constant-temperature closed container, standing for a period of time until the volatile state is stable, and carrying out component analysis on the air at the top of the closed container to obtain the volatile component information emitted by the dissipation source. Due to the factors of the proportion difference of raw materials, the volatility difference of different components and the like, different component volatilization rates emitted by the dissipation sources are greatly different, so that the composition of the emitted components is greatly influenced by volatilization time and environmental temperature. The headspace analysis method aims at representing the composition of the components after the volatilization state of the sample reaches a stable state, does not relate to the composition change on a time scale, and needs to keep constant environment temperature to ensure the representativeness of sampling, so that the characteristic of the composition change of the components volatilized by a dissipation source along with time and temperature cannot be studied by applying the method. In addition, for a very volatile and instantaneous emission obvious dissipation source, the concentration of a headspace area in a container is very easy to exceed the measuring range and the linear response range of an instrument, and meanwhile, the interference of ambient air is difficult to be eliminated in the sample placing process, so that a great challenge is brought to the analysis of components.
In summary, the current research on emission characteristics and component compositions of emission sources has a great disadvantage: 1. a large number of novel volatile chemicals and other dissipation products are put on the market every year, but the research on the measurement of the volatile components emitted by the dissipation products is far lagging behind. 2. Volatile components emitted by the fugitive source are greatly affected by the ambient temperature and their emission characteristics are also different on different time scales, but the research on the variation characteristics of the emitted components of the fugitive source on different time scales and at different temperatures is quite insufficient at present.
Disclosure of Invention
The invention aims to provide a box-type escape source volatile component controllable high-precision characterization system which can improve the monitoring precision of the escape source volatile component.
In order to achieve the aim, the invention provides a box-type escape source volatile component controllable high-precision characterization system which comprises the following modules.
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 includes only oxygen and nitrogen.
And 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.
Optionally, the volatilization dilution 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 evaporation box device is used for providing evaporation 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.
Optionally, the gas flow control device is a mass flow controller.
Optionally, the volatilizing box device includes: 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.
Optionally, 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.
Optionally, the climate box temperature control module comprises: climate box equipment, intake pipe, outlet duct, air circulation equipment, compression cooling equipment, electric heat intensification equipment, temperature sensor and temperature control unit.
The volatile box device is located inside the climatic box device.
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.
Optionally, the drawer type sample injection module includes: sealing door frame, circular sealing door, advance kind drawer and lever pressure screw.
The sealed door frame is sealed and inlaid on the flexible sampling bag.
The sealing door frame and the sample injection 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.
Optionally, the sealing door frame, the circular sealing door and the sample introduction drawer are all made of PFA-PTFE.
Optionally, the fugitive source composition 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.
Optionally, the emission 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.
According to the specific embodiment provided by the invention, the invention discloses the following technical effects: according to the invention, the volatilization diluting module is used for providing a volatilization space for the dissipation source sample, and mixed gas is introduced into the volatilization space to dilute volatile components in the dissipation source sample, so that long-time continuous volatilization of the dissipation source sample under the condition of no influence is ensured, the climate box temperature control module is used for accurately controlling the ambient temperature in the volatilization process of the dissipation source sample, so that support is provided for researching the change characteristics of the composition of volatile components emitted by the dissipation source along with time and temperature, the drawer type sample injection module can be used for eliminating the environmental air pollution and the human interference in the placement and volatilization process of the dissipation source sample, stable volatilization of the dissipation source sample in the volatilization space is ensured in the long-time sampling process, the representativeness of component measurement results on the emission characteristics of the dissipation source is ensured, and the monitoring precision of the dissipation source volatile components is further improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions of the prior art, the drawings that are needed in the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a box-type emission source volatile component controllable high-precision characterization system provided by the invention.
Symbol description: 11-volatilize case equipment, 12-zero air supply equipment, 13-gas flow control equipment, 14-first sampling pipe, 15-second sampling pipe, 16-flexible sampling bag, 17-sampling bag support frame, 18-spring hanger, 19-sealed door frame support lever, 21-climatic case equipment, 22-intake pipe, 23-outlet pipe, 24-air circulation equipment, 25-compression cooling equipment, 26-electrothermal heating equipment, 27-temperature sensor, 28-temperature control unit, 31-sealed door frame, 32-circular sealing door, 33-sampling drawer, 34-lever pressure screw, 41-component monitoring equipment, 42-third sampling pipe, 43-intake sampling pipe of component monitoring equipment, 44-drainage pump, 45-fourth sampling pipe.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The invention aims to provide a box-type escape source volatile component controllable high-precision characterization system, which provides measurement conditions for long-time continuous volatilization of an escape source sample on one hand and accurately controls the volatilization temperature of the escape source sample on the other hand by arranging a volatilization dilution module and a climate box temperature control module, provides support for researching the change characteristics of the composition of volatile components discharged by the escape source along with time and temperature by matching with a quick-response component monitoring device, and can solve the problems of concentration overrun and ambient air interference through sample dilution and an optimized sample injection mode.
In order that the above-recited objects, features and advantages of the present invention will become more readily apparent, a more particular description of the invention will be rendered by reference to the appended drawings and appended detailed description.
The invention provides a box-type escape source volatile component controllable high-precision characterization system, which comprises: the device comprises a volatilization dilution module, a climate box temperature control module, a drawer type sample injection module and a dissipation source component monitoring module. The required instruments can be added later according to the requirements of related researches or experiments.
(1) 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 includes oxygen and nitrogen. Wherein the volume ratio of oxygen to nitrogen is about 1:4.
Specifically, as shown in fig. 1, the volatilization diluting module includes: a volatilization box device 11, a zero air supply device 12, a gas flow control device 13, a first sampling tube 14 and a second sampling tube 15. The first sampling tube 14 and the second sampling tube 15 are both made of a perfluoroalkoxy resin-Polytetrafluoroethylene (PFA-PTFE) material, and the tube diameters and lengths of the first sampling tube 14 and the second sampling tube 15 are flexibly determined according to the site conditions.
The evaporation tank device 11 is used for providing evaporation space for the dissipation source sample.
The zero air supply device 12 communicates with the gas flow control device 13 through the first sampling tube 14, and the gas flow control device 13 communicates with the evaporation tank device 11 through the second sampling tube 15.
The zero air supply device 12 is configured to supply the mixed gas to the evaporation tank device 11 through the gas flow rate control device 13.
The gas flow control device 13 is used for adjusting the flow rate of the mixed gas entering the volatilizing box device 11. As a specific embodiment, the gas flow control device 13 is a mass flow controller, and can adjust the pressure difference between the inlet and the outlet, accurately control the flow rate of the passing gas, and the accuracy is at least 1% of the maximum control flow rate.
In this embodiment, the volatilization box device 11 includes: a flexible sampling bag 16, a sampling bag support frame 17 and a spring hanger 18. The flexible sampling bag 16 is a square sampling bag made of PFA-PTFE material, and the length, width and height dimensions are flexibly determined according to requirements. The sampling bag supporting outer frame 17 is a square metal frame, and the length, width and height dimensions are slightly larger than those 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 inside of the flexible sampling bag 16 is a volatilization space for the dissipation source sample, that is, the dissipation source sample volatilizes inside the flexible sampling bag 16.
The spring hooks 18 are springs with hooks at two ends, and are used for fixing the outer corners of the flexible sampling bag 16 and the inner corners of the sampling bag supporting outer frame 17, so that the flexible sampling bag 16 is suspended inside the sampling bag supporting outer frame 17 and provided for a certain shrinkage space of the flexible sampling bag 16. The spring hanger 18 is of a detachable design, can be adjusted according to different experimental requirements, and facilitates 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 perform dynamic volatilization and static accumulation tests of the dissipation source, thereby identifying the emission characteristics.
In addition, the evaporation dilution module further comprises a sealed door frame support lever 19.
The volatilization diluting module provided by the invention can simulate the dynamic volatilization condition of the dissipation source by continuously providing the diluting zero air, ensure long-time continuous volatilization of the dissipation source sample under the condition of no influence, and provide sampling conditions for recording the discharge of the volatile component concentration of the dissipation source discharge along with the change of time. And moreover, the volatilization dilution module can adjust the dilution ratio by controlling the supply flow of zero air, so that the problem of overrun of the concentration of volatile components can be effectively avoided, and the accuracy of component concentration measurement is improved.
(2) The climate box temperature control module is connected with the volatilization diluting module and is used for controlling the ambient temperature in the volatilization process of the dissipation source sample.
Specifically, the climate box temperature control module includes: the air conditioning system comprises a climate box 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.
The evaporation tank apparatus 11 is located inside the climate tank apparatus 21. The climatic chamber device 21 is a chamber structure made of thermal insulation material, and the front side of the climatic chamber device can be opened to be placed into the volatilizing chamber device 11. The inner space is provided with an air inlet dispersing port and an air outlet collecting port which are respectively connected with an air inlet pipe 22 and an air outlet pipe 23, so that unidirectional circulation of air in the climatic box equipment 21 is realized.
The interior air of the flexible sampling bag 16 is hermetically connected to the first sampling tube 14 and the third sampling tube 42, independent of the interior air of the climatic chamber device 21, and is not disturbed. The climate box assembly 21 is perforated on both sides for the passage of the first sampling tube 14 and the third sampling tube 42.
The temperature sensor 27 is located at an inner bottom portion of the climate box device 21, and the temperature sensor 27 is used for detecting the temperature in the climate box device 21 in real time.
The air circulation device 24 is communicated with the inside of the climatic chamber device 21 through the air inlet pipe 22 and the air outlet pipe 23, and is respectively connected with the compression cooling device 25 and the electric heating device 26. The air circulation device 24 is configured to circulate air inside the climate box device 21 through the air inlet pipe 22 and the air outlet pipe 23.
As a specific embodiment, the air circulation device 24 is a fan. The fan sends the air after the temperature control into the inside of the climatic box equipment 21 through the air inlet pipe 22, realizes the unidirectional circulation of the air between the climatic box equipment 21 and the volatilizing box equipment 11, is discharged by the air outlet pipe 23, ensures that the temperature in the climatic box equipment 21 is in a stable state, and achieves the aim of accurately controlling the temperature in the flexible sampling bag 16.
The compression cooling device 25 exchanges heat using air as a medium for heat exchange, and the heat is taken away by the air. When room temperature air enters the compression cooling equipment 25, heat of the room air is rapidly transferred to the aluminum alloy core body with good heat conduction performance, the air passes through the air passage at a high speed, and the heat is forcedly taken away, so that the temperature of the room air is reduced, and the air with reduced temperature enters the inside of the climatic box equipment 21 through the air circulation equipment 24, so that the aim of reducing the temperature in the climatic box equipment 21 is fulfilled.
The electrothermal heating device 26 is a device for heating air by heating current through a resistance wire, and has the advantages of uniform heating, stable heat supply, high efficiency, compact structure, sensitive reaction, convenient implementation of automatic control and the like, and the air with the temperature being increased enters the inside of the climatic box device 21 through the air circulation device 24, so that the aim of increasing the temperature in the climatic box device 21 is fulfilled.
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, 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 configured to control the ventilation amount of the air circulation device 24 according to the temperature in the climatic chamber device 21, control the operation states of the compression cooling device 25 and the electrothermal heating device 26, and timely adjust the air temperature in the climatic chamber device 21, and more stably control the temperature condition when the dissipation source sample volatilizes, so as to affect the volatilization of the dissipation source sample in the flexible sampling bag 16, and on the basis of avoiding the interference of the change of the external environment temperature on the volatilization process and the concentration measurement and ensuring the stable measurement of the dissipation source sample component, the emission characteristics and the law of the dissipation source sample component under different temperature conditions can be studied by controlling the temperature so as to affect the volatilization rate of the dissipation source sample component.
Furthermore, the temperature control unit 28 is also adapted to display the temperature in the climate box arrangement 21 in real time via a display panel.
The temperature control module of the climate box can accurately control the volatilization temperature of the dissipation source sample by adjusting the temperature and the flow of the unidirectional circulating gas, and provides support for researching the change characteristics of the composition of volatile components discharged by the dissipation source along with time and temperature.
(3) The drawer type sample injection module is connected with the volatilization dilution module and is used for sending the dissipation source sample into the volatilization space.
Specifically, the drawer type sample injection module comprises: the sealing door frame 31, the round sealing door 32, the sample introduction drawer 33 and the lever pressure screw 34. The number of lever pressure screws 34 is plural. Preferably, the sealing door frame 31, the circular sealing door 32 and the sample introduction 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 inlaid part is sealed well. Specifically, the sealing door frame 31 is connected with the sealing door frame supporting lever 19 in the evaporation dilution module to ensure a fixed support.
The sealing door frame 31 and the sample introduction drawer 33 are both fixed with the circular sealing door 32 through the lever pressure screw 34. Specifically, the round seal door 32 is fixed to the seal door frame 31 by 4 lever pressure screws 34, and the edge of the round seal door 32 is brought into contact engagement with the plate material of the seal door frame 31 to provide pressure seal.
The sample introduction drawer 33 is a hollow cuboid which is hollowed out in the middle of the circular sealing door 32. The sample introduction drawer 33 carries the escape source sample inside, and the sample introduction drawer 33 is used for sending the escape source sample into the flexible sampling bag 16.
The area of the outer part of the sample drawer 33 needs to be slightly larger than the hollowed-out area of the middle part of the circular sealing door 32 so as to ensure sealing. The sample introduction drawer 33 employs 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, and the tightness of the drawer type sample injection module is ensured.
The drawer type sample injection module provided by the invention can eliminate environmental air pollution and artificial interference in the process of placing and volatilizing the dissipation source sample, ensure stable volatilization of the dissipation source sample in the flexible sampling bag 16 in the long-time sampling process, and ensure the representativeness of component measurement results on the emission characteristics of the dissipation source.
(4) 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.
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 communicated with the volatilization space of the volatilization diluting module through the third sampling pipe 42, and the component monitoring device 41 is used for monitoring the concentration of volatile components in the gas after the dissipation source sample volatilizes.
The inlet sampling tube 43 of the component monitoring device is connected to the outlet line (third sampling tube 42) of the flexible sampling bag 16 in the volatilization dilution module, ensuring that the volatilized gas of the fugitive source sample can enter the component monitoring device 41. After the gas emitted by the sample dissipation is blown out from the flexible sampling bag 16 and enters the component monitoring device 41 through the third sampling tube 42 and the third sampling tube 42, the component monitoring device 41 can rapidly acquire the concentration information of the volatile component of the dissipation source in real time, and the high precision of the concentration information can reach the order of seconds in time measurement.
Further, the component monitoring device 41 incorporates a sampling pump capable of drawing sample air from the air flow branch of the outlet of the climatic chamber device 21.
The component monitoring device 41 can realize high-precision monitoring of the concentration of volatile components of various dissipation sources in the atmosphere (such as inorganic gases, gaseous volatile organic compounds and the like), including but not limited to the existing volatile organic compound on-line monitoring instrument, greenhouse gas on-line monitoring instrument and the like.
The fugitive source component monitoring module further comprises a drain pump 44 and a fourth sampling tube 45. The drainage pump 44 is connected to the component monitoring device 41 through the fourth sampling tube 45. The drainage pump 44 is used for pumping the volatilized gas from the volatilizing space of the volatilizing dilution module. The drainage pump 44 is a low-power rotary vane vacuum pump, and its rated power, maximum sampling flow, maximum vacuum degree and other parameters can be determined according to actual requirements.
The fourth sampling tube 45 is made of PFA-PTFE material, and the length and the tube diameter of the fourth sampling tube are determined according to practical requirements.
Taking a typical personal care product in volatile chemicals as an example, zero air is flushed out of the volatilization box device 11 through a volatilization dilution module at a fixed flow, residual ambient air in the volatilization box device 11 is sufficiently removed, a sample of the personal care product is placed into the volatilization box device 11 through a drawer type sample injection module, and isolation from the ambient air is ensured by positive pressure of the volatilization box device 11. The volatilizing box device 11 is arranged in the climatic box device 21, and the temperature conditions in the volatilizing process of the sample are stably controlled by controlling the ventilation quantity of air circulation, the working states of the compression cooling device 25 and the electric heating device 26 through the climatic box temperature control module. After the volatile components of the sample are diluted by zero air in the volatile box device 11, the emission source component monitoring module fed in by the sampling tube and concentration measurement is carried out with a time resolution of 1 second, so as to obtain emission characteristics of the composition of the volatile components of the sample influenced by time and temperature conditions.
The invention makes up the limitation of the existing headspace analysis technology in the process of analyzing the volatile components emitted by the emission source, can carry out the measurement work of the volatile components emitted by the emission products such as volatile chemicals and the like under the condition of not being interfered by external environment air, characterizes the change of the volatile components emitted by the emission source along with time and temperature, and provides data support for carrying out the fine simulation and prediction of secondary pollutants in the atmosphere. Based on the fact that the total amount control of the dissipation sources is gradually advanced to component control in the current air pollution treatment work, and the current research on the emission characteristics of the dissipation sources represented by volatile chemicals and the like and the composition of the volatile components is greatly insufficient, the invention can be widely popularized and applied in the fields of updating the air pollutant emission list and the like in the future, and has a certain commercial prospect.
The principles and embodiments of the present invention have been described herein with reference to specific examples, the description of which is intended only to assist in understanding the methods of the present invention and the core ideas thereof; also, it is within the scope of the present invention to be modified by those of ordinary skill in the art in light of the present teachings. In view of the foregoing, this description should not be construed as limiting the invention.
Claims (6)
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 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 equipment, the compression cooling equipment and the electric heating equipment, and is used for controlling the ventilation quantity of the air circulation equipment according to the temperature in the climatic box equipment and controlling the running states of the compression cooling equipment and the electric heating equipment so as to adjust the air temperature in the climatic box equipment;
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;
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 sample introduction drawer is used for carrying the dissipation source sample into the flexible sampling bag;
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 escape source volatile component controllable high-precision characterization system according to claim 1, wherein the sealing door frame, the circular sealing door and the sample introduction drawer are all made of PFA-PTFE.
5. 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.
6. The box-type escape source volatile component controllable high-precision characterization system according to claim 5, 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.
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