CN111965263A - Portable organic volatile matter short-term test appearance - Google Patents
Portable organic volatile matter short-term test appearance Download PDFInfo
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- CN111965263A CN111965263A CN202010817880.7A CN202010817880A CN111965263A CN 111965263 A CN111965263 A CN 111965263A CN 202010817880 A CN202010817880 A CN 202010817880A CN 111965263 A CN111965263 A CN 111965263A
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N30/00—Investigating or analysing materials by separation into components using adsorption, absorption or similar phenomena or using ion-exchange, e.g. chromatography or field flow fractionation
Abstract
The invention discloses a portable organic volatile matter rapid detector, which comprises a core component and an analyzer, wherein the core component extracts gas to be analyzed and enables the organic volatile matter gas to be shunted with air, and the core component sends the organic volatile matter gas to the analyzer. The core part includes the core shell, it separates the inside space of core shell for hot flow chamber and cold flow chamber to set up the baffle in the core shell, hot flow chamber and cold flow intracavity have been annotated to the extract liquid, hot flow chamber and cold flow chamber intercommunication and constitute circulation channel, bottom in the core shell sets up the circulating pump, the hot flow intracavity has the extract liquid that the part that generates heat is used for heating the hot flow intracavity, the detector still includes the intake pipe, set up the drainage fan in the intake pipe, the external gas of waiting to analyze is connected to intake pipe one end, one end penetrates the bottom that is located the cold flow chamber in the core shell, the drainage fan is with the outer analytic gas of waiting of core shell introduce in the intake pipe and discharge at the end, cold flow chamber top sets up arranges to external blast pipe, hot flow chamber top sets up the appearance trachea that leads.
Description
Technical Field
The invention relates to the field of organic volatile matter detection equipment, in particular to a portable organic volatile matter rapid detector.
Background
Volatile Organic Compounds (VOCs) not only can affect human health, stimulate eyes and respiratory tracts, cause allergy to human skin and cause discomfort symptoms such as headache, pharyngalgia, hypodynamia and the like, but also have carcinogenicity.
Meanwhile, the volatile organic compound is also an important precursor for forming secondary pollutants such as fine particulate matters (PM2.5), ozone (O3) and the like, and further causes atmospheric environmental problems such as dust haze, photochemical smog and the like. With the rapid development of industrialization and urbanization in China and the continuous increase of energy consumption, regional composite air pollution characterized by PM2.5 and O3 is increasingly prominent, the phenomenon of heavy air pollution in a region is increased in a large range, the sustainable development of socioeconomic performance is severely restricted, and the health of people is threatened.
Along with the improvement of the attention of people to the pollution of volatile organic compounds, the nation also puts forward clear requirements on the treatment, emission control, detection and supervision of the volatile organic compounds.
The premise of the requirement of organic volatile matter treatment is to reliably detect the organic volatile matter, and the existing detection means is to detect the molecular level by a chromatographic analysis method to obtain a peak intensity curve and calculate the concentration of the organic volatile matter by combining with the gas flow or the volume of a sample bottle.
In the prior art, a chromatographic analysis method uses a complex and bulky machine, needs more auxiliary equipment to ensure detection precision and detection preparation work, and is portable and high in precision, which are two requirements that cannot be unified.
Disclosure of Invention
The invention aims to provide a portable quick detector for organic volatile matters, which aims to solve the problems in the prior art.
In order to achieve the purpose, the invention provides the following technical scheme:
a portable organic volatile quick detector comprises a core component and an analyzer, wherein the core component extracts gas to be analyzed and enables the organic volatile gas to be separated from air, and the core component sends the organic volatile gas to the analyzer. The separated organic volatile gas can be continuously and directly sent to an analyzer for chromatographic analysis without intermittent sample sending analysis, and devices such as a cold trap and the like can be omitted in a direct sample sending mode for occasions with low analysis precision requirements under certain conditions.
The core part includes the core shell, it is hot flow chamber and cold flow chamber to set up the space separation inside the core shell for the baffle in the core shell, hot flow chamber and cold flow intracavity have been annotated to the extract liquid, hot flow chamber and cold flow chamber intercommunication and constitute circulation channel, bottom in the core shell sets up the circulating pump, the extract pump with the cold flow intracavity is backward flowed back to the cold flow chamber toward the hot flow chamber and at hot flow chamber top to the circulating pump, the hot flow intracavity has the extract that the part that generates heat is used for heating the hot flow intracavity, the detector still includes the intake pipe, set up the drainage fan in the intake pipe, the external gas of waiting to analyze is connected to intake pipe one end, one end penetrates the bottom that is located the cold flow chamber in the core shell, the drainage fan is with waiting to analyze outside the core shell and is introduced in the intake pipe and is discharged at the end, cold flow chamber top sets up arranges outside blast pipe, hot.
The core shell is a core device for carrying out air inlet shunting, gas enters an air inlet pipe from the outside and is blown into a cold flow cavity at the tail end, gas to be analyzed floats up in a bubble mode, organic volatile matter gas is extracted and absorbed by extraction liquid, air components are insoluble or slightly soluble in the extraction liquid, the air components are discharged out of the device from the top of the cold flow cavity, organic volatile matter components are absorbed in the extraction liquid, the extraction liquid is conveyed to a hot flow cavity from the cold flow cavity along with a circulating pump, the extraction liquid extracting the organic volatile matter is heated in the hot flow cavity, the organic volatile matter in the extraction liquid is heated and separated out and floats and accumulates on the top of the hot flow cavity, a sample gas pipe is arranged at the top of the hot flow cavity for carrying out chromatographic analysis, the gas discharged from the hot flow cavity filtered by the core shell is the organic volatile matter with the concentration of almost 100 percent, remarkable peak intensity can be obtained in a chromatograph, and subsequent calculation is carried out, the large difference between the peak intensity and the baseline can effectively reduce the error of the device, and the extraction liquid filters the air component and stacks the air component, so the peak intensity is higher and the baseline vibration is smaller on the curve chart.
And gas flow meters are arranged on the sample gas pipe and the exhaust pipe, and the concentration ratio of the organic volatile matters in the inlet gas can be obtained by combining the peak intensity, the flow rate in the sample gas pipe and the flow rate in the exhaust pipe. The organic volatile extraction process can be continuously carried out, the chromatographic analysis of the organic substances can also be continuously carried out, the detector of the invention is fixed, and the environmental gas at one place is monitored and identified for a long time, so that the information of the concentration change of the organic volatile at the place in a period of time can be obtained, and the information is continuous.
When the air inlet pipe enters the core shell, the air inlet pipe firstly penetrates into the hot flow cavity and then penetrates through the partition plate to enter into the cold flow cavity, the air inlet pipe is provided with a flow resistance valve, and the flow resistance valve is close to the position where the air inlet pipe penetrates through the partition plate.
The setting of flow resistance valve makes to have great pressure to one section pipeline of flow resistance valve by drainage fan, and the influent stream is compressed on this section pipeline, and then the temperature rises, and the intraductal gas that the temperature rises just in time passes through the extract liquid of pipe wall with heat transfer for the thermal current intracavity, makes extract liquid temperature rise and then organic volatile matter precipitate, promptly: one section pipeline from the drainage fan to the flow resistance valve in the air inlet pipe is used as a heat source of the heat flow cavity, the heat source does not need to be independently arranged, and the heat flow cavity has the following effect: the gas that the choker was compressed before the valve under the condition that experiences the heat transfer, can flow after the choker valve, adiabatic expansion is caused in the sudden drop of pressure, and the temperature reduces fast, promptly: the mixed gas temperature of discharging into cold flow intracavity is less than the inlet air temperature, and microthermal mixed gas blows in the extract in cold flow chamber, and organic volatile matter is in lower temperature fuses in the extract, is difficult to reach precipitation temperature, promptly: the organic volatile matters entering the cold flow cavity can have high solubility at low temperature, the extraction liquid extracts the organic volatile matters in the mixed gas as much as possible, and the dissolved organic volatile matters are not separated out until the extraction liquid is pumped into the hot flow cavity by the cold flow cavity to be heated, and are sent to the analyzer through the sample gas pipe at the top of the hot flow cavity. The temperature change of gas is constructed through the flow resistance valve, heat is concentrated in the heat flow cavity, the cold flow cavity keeps low temperature, and the shunting effect and the extraction maximization are fully guaranteed.
The air inlet pipe is provided with a section of coil pipe, the coil pipe is positioned between the drainage fan and the flow resistance valve, and the coil pipe is immersed in the heat flow cavity extraction liquid. The existence of the coil pipe enhances the heat exchange effect between the air inlet pipe and the extraction liquid in the heat flow cavity.
The baffle plate is provided with a return pipe, one end of the return pipe is connected with the surface layer extract liquid of the hot flow cavity, and the other end of the return pipe is connected with the middle layer extract liquid of the cold flow cavity. The back flow pipe is used for cooperating the circulating pump to constitute circulation channel, and the extract in the hot flow intracavity preferably need not direct reflux to the top layer in cold flow chamber, because, the extract in the hot flow intracavity is saturated to organic volatile matter, receive the intensification or flow disturbance will appear organic volatile matter a little, if hot flow chamber top layer liquid direct flow to cold flow chamber top layer, then the disturbance of flow probably leads to when part organic volatile matter flows back directly appearing in cold flow chamber top layer and arrange to the air along with the air component of come-up, be unfavorable for the accuracy of measurement, the back flow pipe inserts behind certain degree of depth, just can let the extract of returning have a mixed buffer distance with the cryogenic fluids in the cold flow chamber, organic volatile matter can not appear to the extract after the cooling.
The detector also comprises two cold trap pipes and a sample inlet pipe which are used alternately, the sample inlet pipe is connected with the analyzer, and the two cold trap pipes are respectively connected with the sample gas pipe and the sample inlet pipe alternately. Although the air component is filtered in the core shell, part of the air component still can reach the heat flow cavity due to dissolution or extraction liquid flow, the gas purity in the air inlet pipe is influenced, and secondary adsorption and desorption are carried out through the cold trap pipe in the precision occasion and the occasion that the analyzer does not well enter other components (the dissolution and the precipitation of organic volatile matters in the extraction liquid are counted as primary adsorption and desorption).
The sample inlet ends of the two cold trap pipes are connected with the sample gas pipe through two branch pipelines respectively, the electromagnetic valves are arranged on the branch pipelines, the sample inlet ends of the two cold trap pipes are connected with the sample inlet pipe through two branch pipelines respectively, the electromagnetic valves are arranged on the branch pipelines, the tail ends of the two cold trap pipes are connected with a gas carrying pipe respectively, the tail ends of the two cold trap pipes are connected to an exhaust pipe respectively, the electromagnetic valves are arranged at the tail ends of the two cold trap pipes respectively, and the tail ends of the two cold trap pipes are connected to the check valves of the gas carrying pipes respectively.
This structure is two cold trap pipe alternate use's specific structure, as shown in the figure, when using above one cold trap pipe as adsorbing usefulness, respectively to the sample trachea through the cold trap pipe, the solenoid valve on four branches of sample inlet pipe controls, let the sample inlet end of above one cold trap pipe link to each other with the sample trachea, let next cold trap pipe link to each other with sample inlet pipe, last cold trap pipe tail end exhaust pipe in line, next cold trap pipe tail end connection carrier gas pipe introduces the carrier gas, the part except waiting to analyze organic volatile matter in the gas that comes by the sample trachea arranges to blast pipe eduction gear through last cold trap pipe's last tail section. .
The detector also comprises a gyro frame, the outer ring of the gyro frame is fixed on the components which are statically placed when the shell components of the detector are used, and the like, as shown in the figure, the bottom of the core shell is provided with a balancing weight, and the core shell is arranged on the gyro frame. The gyro frame helps the core body part to realize universal rotation, keeps the postures of the sample gas pipe and the exhaust pipe in the core shell above and below the balancing weight, and prevents the extract liquor in the core shell from blocking the sample gas pipe and the exhaust pipe after the core shell is turned upside down.
Compared with the prior art, the invention has the beneficial effects that: according to the invention, ambient gas is sucked into the air inlet pipe by the drainage fan, the flow resistance valve is arranged at the tail end of the air inlet pipe to pressurize the gas in the air inlet pipe so as to raise the temperature of the gas, the heat is transferred to the extraction liquid in the heat flow cavity to separate out the organic volatile matters dissolved in the gas, the tail end of the air inlet pipe is subjected to pressure drop and the temperature of the gas discharged into the cold flow cavity is reduced, the gas has high solubility in the cold flow cavity, the extraction liquid in the cold flow cavity is sent into the heat flow cavity by the circulating pump to be heated and separated out, the separation of the organic volatile matters and air components is completed in the core shell, the concentration of the organic volatile matters discharged to a subsequent analyzer is greatly improved firstly; thereby two cold trap pipes use in turn further eliminate the air component in the high concentration organic volatile matter gas, prevent that the air component from entering into and influencing the analyzer life-span in the analyzer, if the analyzer precision requirement is not high, self can allow trace air component to get into, then can directly get into the high concentration organic volatile matter drainage in the sample gas pipe, reduce the setting of cold trap pipe, detect structural simplification greatly.
Drawings
In order that the present invention may be more readily and clearly understood, a more particular description of the invention briefly described above will be rendered by reference to specific embodiments that are illustrated in the appended drawings.
FIG. 1 is a schematic structural view of a core shell component of the present invention;
FIG. 2 is a schematic view of the flow of extraction fluid within a core housing component of the present invention;
FIG. 3 is a graph comparing the peak curve of the organic material detected by the present invention with the curve of a conventional detector;
FIG. 4 is a schematic diagram of the present invention using two cold trap tubes to improve analyzer inlet air;
fig. 5 is a schematic view of the rotation of the core-shell of the present invention mounted on a spinning top.
In the figure: 1-core shell, 11-hot flow cavity, 12-cold flow cavity, 13-partition plate, 131-return pipe, 2-air inlet pipe, 21-coil pipe, 3-sample air pipe, 4-exhaust pipe, 51-drainage fan, 52-flow resistance valve, 53-circulating pump, 54-counterweight, 61-cold trap pipe, 62-sample inlet pipe, 63-electromagnetic valve, 64-carrier air pipe, 65-check valve, 7-analyzer and 9-gyroscope frame.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in FIGS. 1 to 4, a portable rapid detector for organic volatile compounds comprises a wick unit and an analyzer 7, wherein the wick unit extracts a gas to be analyzed and divides the gas of organic volatile compounds from air, and the wick unit sends the gas of organic volatile compounds to the analyzer 7. The separated organic volatile gas can be continuously and directly sent to an analyzer for chromatographic analysis without intermittent sample sending analysis, and devices such as a cold trap and the like can be omitted in a direct sample sending mode for occasions with low analysis precision requirements under certain conditions.
The core body part comprises a core shell 1, a partition plate 13 is arranged in the core shell 1 to divide the space inside the core shell 1 into a hot flow cavity 11 and a cold flow cavity 12, extract liquid is filled in the hot flow cavity 11 and the cold flow cavity 12, the hot flow cavity 11 is communicated with the cold flow cavity 12 to form a circulating channel, a circulating pump 53 is arranged at the bottom inside the core shell 1, the extract liquid in the cold flow cavity 12 is pumped to the hot flow cavity 11 by the circulating pump 53 and flows back to the cold flow cavity 12 at the top of the hot flow cavity 11, a heating part is arranged in the hot flow cavity 11 and is used for heating the extract liquid in the hot flow cavity 11, the detector also comprises an air inlet pipe 2, a drainage fan 51 is arranged on the air inlet pipe 2, one end of the air inlet pipe 2 is connected with external gas to be analyzed, one end of the air inlet pipe penetrates into the core shell 1 and is positioned at the bottom of the cold flow cavity 12, the drainage fan 51 introduces the gas to be analyzed outside, the top of the hot flow chamber 11 is provided with a sample gas tube 3 leading to the analyzer 7.
The core shell 1 is a core device for gas inlet and flow splitting, gas enters the gas inlet pipe 2 from the outside and is blown into the cold flow cavity 12 at the tail end, gas to be analyzed floats up in a bubble form, organic volatile matter gas is extracted and absorbed by extraction liquid, air components are insoluble or slightly soluble in the extraction liquid, the air components are discharged out of the device from the top of the cold flow cavity 12, the organic volatile matter components are absorbed in the extraction liquid, the extraction liquid is conveyed to the hot flow cavity 11 from the cold flow cavity 12 by the circulating pump 54, the extraction liquid with the organic volatile matters extracted is heated in the hot flow cavity 11, the organic volatile matters in the extraction liquid are heated and separated out and float and accumulate on the top of the hot flow cavity 11, the sample gas pipe 3 is conveyed to the analyzer 7 for chromatographic analysis, the gas discharged from the hot flow cavity 11 through which the core shell 1 is filtered is the organic volatile matters with the concentration of almost 100%, as shown in figure 3, remarkable peak intensity can be obtained in, in fig. 3, the solid line is the peak intensity curve detected in the present application, the dotted line is the conventional direct intake air, the detection curve after the cold trap is intermittently adsorbed and desorbed and spliced and adjusted according to time, the concentration parameter of the organic volatile matter is obtained by subsequent calculation after the peak intensity curve is obtained, and the error of the device can be effectively reduced by the large difference between the peak intensity vertex and the baseline, because the extraction liquid "filters" the intake air of the air component and "stacks" the intake air of the organic volatile matter component, the peak intensity is higher and the baseline vibration is smaller on the graph.
And gas flow meters are arranged on the sample gas pipe 3 and the exhaust pipe 4, and the concentration ratio of the organic volatile matters in the inlet gas can be obtained by combining the peak intensity, the flow rate in the sample gas pipe 3 and the flow rate in the exhaust pipe 4. The organic volatile extraction process can be continuously carried out, the chromatographic analysis of the organic substances can also be continuously carried out, the detector of the invention is fixed, and the environmental gas at one place is monitored and identified for a long time, so that the information of the concentration change of the organic volatile at the place in a period of time can be obtained, and the information is continuous.
When the air inlet pipe 2 enters the core shell 1, the air inlet pipe firstly penetrates into the hot flow cavity 11 and then penetrates through the partition plate 13 to enter into the cold flow cavity 12, the air inlet pipe 2 is provided with a flow resistance valve 52, and the flow resistance valve 52 is close to the position where the air inlet pipe 2 penetrates through the partition plate 13.
The setting of flow resistance valve 52 makes and has great pressure on the section pipeline of flow resistance valve 52 by drainage fan 51, and the influent stream gas is compressed on this section pipeline, and then the temperature rises, and the intraductal gas that the temperature rises just in time passes through the extract liquid that the pipe wall transmitted the heat to in the heat flow chamber 11, makes the extract liquid temperature rise and then organic volatile matter is appeared, promptly: one section of pipeline from the drainage fan 51 to the flow resistance valve 52 on the air inlet pipe 2 is used as a heat source of the heat flow cavity 11, so that the heat source does not need to be separately arranged, and the heat flow cavity has the following effects: the gas compressed before the choke valve 52, when undergoing heat exchange, may undergo adiabatic expansion after flowing through the choke valve 52 due to a sudden pressure drop, with a rapid temperature drop, namely: the mist temperature of discharging into in the cold flow chamber 12 is less than the inlet air temperature, and microthermal mist blows in the extract in cold flow chamber 12, and organic volatile matter is fused in the extract under lower temperature, is difficult to reach precipitation temperature, promptly: the organic volatile matter entering the cold flow chamber 12 can have a high solubility at low temperature, and the extraction liquid extracts as much organic volatile matter in the mixed gas as possible, until the extraction liquid is pumped into the hot flow chamber 11 by the cold flow chamber 12 to be heated, the dissolved organic volatile matter does not begin to separate out, and is sent to the analyzer 7 through the sample gas pipe 3 at the top of the hot flow chamber 11. The temperature change of the gas is constructed through the flow resistance valve 52, so that the heat is concentrated in the heat flow cavity 11, the cold flow cavity 12 is kept at low temperature, and the flow dividing effect and the extraction maximization are fully ensured.
The inlet pipe 2 is provided with a section of coil 21, the coil 21 is positioned between the drainage fan 51 and the flow resistance valve 52, and the coil 21 is immersed in the extraction liquid in the hot flow cavity 11. The presence of the coil 21 enhances the heat exchange between the inlet pipe 2 and the extraction fluid in the hot fluid chamber 11.
The baffle 13 is provided with a return pipe 131, one end of the return pipe 131 is connected with the surface layer extract liquid in the hot flow cavity 11, and the other end is connected with the middle layer extract liquid in the cold flow cavity 12. The return pipe 131 is used for cooperating with the circulating pump 53 to form a circulating channel, and the extract liquid in the hot flow cavity 11 preferably does not need to directly flow back to the surface layer of the cold flow cavity 12, because the extract liquid in the hot flow cavity 11 is saturated to the organic volatile matter and the organic volatile matter is separated out by slight temperature rise or flow disturbance, if the liquid on the surface layer of the hot flow cavity 11 directly flows to the surface layer of the cold flow cavity 12, the disturbance of the flow may cause part of the organic volatile matter to directly separate out on the surface layer of the cold flow cavity 12 during backflow and be discharged into the air along with the floating air component, which is not beneficial to the accuracy of metering, after the return pipe 131 is inserted into a certain depth, the return extract liquid and the low-temperature liquid in the cold flow cavity 12 can have a mixing buffer distance, and the cooled extract liquid.
The detector also comprises two cold trap pipes 61 and a sample inlet pipe 62 which are used alternately, wherein the sample inlet pipe 62 is connected with the analyzer 7, and the two cold trap pipes 61 are respectively connected with the sample gas pipe 3 and the sample inlet pipe 62 alternately. Although the air component is filtered in the cartridge shell 1, there is still a possibility that a part of the air component reaches the hot flow chamber 11 due to dissolution or the flow of the extraction liquid, which affects the purity of the gas in the gas inlet pipe 3, and in the case of accuracy and the case of the analyzer 7 not well entering other components, the secondary adsorption and desorption is performed through the cold trap pipe 61 (the dissolution and precipitation of the organic volatile in the extraction liquid is counted as the primary adsorption and desorption).
The sample inlet ends of the two cold trap pipes 61 are connected with the sample gas pipe 3 through two branch pipelines respectively and are provided with electromagnetic valves 63 on the branch pipelines, the sample inlet ends of the two cold trap pipes 61 are also connected with the sample inlet pipe 62 through two branch pipelines respectively and are provided with electromagnetic valves 63 on the branch pipelines, the tail ends of the two cold trap pipes 61 are connected with a gas carrying pipe 65 respectively, the tail ends of the two cold trap pipes 61 are connected to the exhaust pipe 4, the tail ends of the two cold trap pipes 61 are provided with electromagnetic valves respectively, and the tail ends of the two cold trap pipes 61 are connected to the respective branch pipelines of the gas carrying pipe 65 and are provided with check valves 65 facing the cold trap pipes 61.
The structure is a concrete structure with two cold trap pipes 61 used alternately, as shown in fig. 4, when the upper cold trap pipe 61 is used as adsorption, the electromagnetic valves 63 on the four branches of the sample gas pipe 3 and the sample inlet pipe 62 are respectively controlled through the cold trap pipe 61, the sample gas inlet end of the upper cold trap pipe 61 is connected with the sample gas pipe 3, the lower cold trap pipe 61 is connected with the sample inlet pipe 62, the tail end of the upper cold trap pipe 61 is directly discharged into the exhaust pipe 4, the tail end of the lower cold trap pipe 61 is connected with the carrier gas pipe 64 to introduce carrier gas, and the part of the gas from the sample gas pipe 3 except organic volatile matters to be analyzed is discharged to the exhaust pipe 4 through the tail section of the upper cold trap pipe 61 to be discharged out of the device. .
As shown in fig. 5, the detecting instrument further includes a gyro frame 9, an outer ring of the gyro frame 9 is fixed on a component which is statically placed when the shell component of the detecting instrument is used, as shown in fig. 1, a weight block 54 is arranged at the bottom of the core shell 1, and the core shell 1 is installed on the gyro frame 9. The gyro frame 9 helps the core body part to realize universal rotation, keeps the postures of the sample gas pipe 3 and the exhaust pipe 4 in the core shell 1 above and the balance weight block 54 below, and prevents the extract liquor in the core shell 1 from blocking the sample gas pipe 3 and the exhaust pipe 4 after being turned upside down.
The main use process of the device is as follows: the detector is placed at a place where organic volatile matters need to be detected, the air around the air is sucked by the drainage fan to enter the air inlet pipe 2, the supercharging temperature is increased, heat is transferred to the extraction liquid in the hot flow cavity 11 to separate out the organic volatile matters dissolved in the extraction liquid, the pressure drop at the tail end of the air inlet pipe 2 is reduced, the temperature of the air flowing into the cold flow cavity 12 is reduced, the air has high solubility in the cold flow cavity 12, the extraction liquid in the cold flow cavity 12 is sent into the hot flow cavity 11 by the circulating pump 53 to be heated and separated out, the separation of the organic volatile matters and air components is completed in the core shell 1, the concentration of the organic volatile matters discharged to the subsequent analyzer 7 is greatly improved, a larger peak height is formed on a peak intensity curve, the detection.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Claims (8)
1. A portable organic volatile matter rapid detector is characterized in that: the apparatus comprises a wick unit which draws the gas to be analyzed and separates the volatile organic compound gas from air, and an analyzer (7) which sends the volatile organic compound gas to the analyzer (7).
2. The portable rapid detector for organic volatile compounds according to claim 1, wherein: the core component comprises a core shell (1), a partition plate (13) is arranged in the core shell (1) to separate the space inside the core shell (1) into a hot flow cavity (11) and a cold flow cavity (12), extract liquid is injected into the hot flow cavity (11) and the cold flow cavity (12), the hot flow cavity (11) is communicated with the cold flow cavity (12) and forms a circulating channel, a circulating pump (53) is arranged at the bottom in the core shell (1), the extract liquid in the cold flow cavity (12) is pumped into the hot flow cavity (11) by the circulating pump (53) and flows back to the cold flow cavity (12) at the top of the hot flow cavity (11), a heating component is arranged in the hot flow cavity (11) to heat the extract liquid in the hot flow cavity (11), the detector further comprises an air inlet pipe (2), a drainage fan (51) is arranged on the air inlet pipe (2), one end of the air inlet pipe (2) is connected with external gas to be analyzed, and one end of the air inlet pipe penetrates into the bottom of the cold flow cavity (12) in the core shell (, the gas to be analyzed outside the core shell (1) is introduced into the gas inlet pipe (2) by the drainage fan (51) and is discharged from the tail end, the top of the cold flow cavity (12) is provided with a gas exhaust pipe (4) which is exhausted to the outside, and the top of the hot flow cavity (11) is provided with a sample gas pipe (3) which leads to the analyzer (7).
3. The portable rapid detector for organic volatile compounds according to claim 2, characterized in that: when the air inlet pipe (2) enters the core shell (1), the air inlet pipe firstly penetrates into the hot flow cavity (11) and then penetrates through the partition plate (13) to enter into the cold flow cavity (12), the air inlet pipe (2) is provided with a flow resistance valve (52), and the flow resistance valve (52) is close to the position where the air inlet pipe (2) penetrates through the partition plate (13).
4. The portable rapid detector for organic volatile compounds according to claim 3, wherein: the air inlet pipe (2) is provided with a section of coil pipe (21), the coil pipe (21) is located between the drainage fan (51) and the flow resistance valve (52), and the coil pipe (21) is immersed in the extraction liquid in the hot flow cavity (11).
5. The portable rapid detector for organic volatile compounds according to claim 2, characterized in that: a return pipe (131) is arranged on the partition plate (13), one end of the return pipe (131) is connected with the surface layer extract liquid in the hot flow cavity (11), and the other end of the return pipe is connected with the middle layer extract liquid in the cold flow cavity (12).
6. The portable rapid detector for organic volatile compounds according to claim 2, characterized in that: the detector also comprises two cold trap pipes (61) and a sample inlet pipe (62) which are used alternately, wherein the sample inlet pipe (62) is connected with the analyzer (7), and the two cold trap pipes (61) are respectively and alternately connected with the sample gas pipe (3) and the sample inlet pipe (62).
7. The portable rapid detector for organic volatile compounds according to claim 6, wherein: two the sample inlet end of cold trap pipe (61) is connected and is set up solenoid valve (63), two on branch pipeline through two branch pipeline respectively with sample trachea (3) the sample inlet end of cold trap pipe (61) still with advance appearance pipe (62) and set up solenoid valve (63), two on branch pipeline through two branch pipeline connections respectively the tail end of cold trap pipe (61) is connected one respectively and is carried trachea (65), two the tail end of cold trap pipe (61) still is connected to on blast pipe (4), two the tail end of cold trap pipe (61) sets up the solenoid valve respectively, two the tail end of cold trap pipe (61) is connected to and sets up check valve (65) towards cold trap pipe (61) on the branch of trachea (65) separately.
8. The portable rapid detector for organic volatile compounds according to claim 2, characterized in that: the detector further comprises a gyroscope frame (9), a balancing weight (54) is arranged at the bottom of the core shell (1), and the core shell (1) is installed on the gyroscope frame (9).
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