CN211426279U - Reaction tube for online measurement of total OH reactivity and measurement system with reaction tube - Google Patents
Reaction tube for online measurement of total OH reactivity and measurement system with reaction tube Download PDFInfo
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- CN211426279U CN211426279U CN201922378924.6U CN201922378924U CN211426279U CN 211426279 U CN211426279 U CN 211426279U CN 201922378924 U CN201922378924 U CN 201922378924U CN 211426279 U CN211426279 U CN 211426279U
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Abstract
The utility model relates to the technical field of atmospheric environment monitoring equipment, and discloses a reaction tube for online measurement of OH total reactivity, which comprises a main reaction chamber, a first air inlet arm, a second air inlet arm, an air outlet arm and a reflection chamber; the first air inlet arm comprises a main channel, a first support arm and a second support arm; first support arm and second support arm all communicate with the main entrance, the main entrance slope sets up in the one end of main reaction chamber, the second arm slope that admits air sets up in the one end of main reaction chamber, the axis of main entrance intersects in the main reaction chamber with the axis of second arm of admitting air, the top and the main reaction chamber intercommunication of reverberation chamber, the bottom convergent to the closure of reverberation chamber, the inner chamber of main reaction chamber and reverberation chamber is passed in proper order to the axis of main entrance, the arm of giving vent to anger sets up the other end at the main reaction chamber along the horizontal direction. The utility model also discloses a measurement system of having this reaction tube. The beneficial effects are that: the reaction tube capable of effectively reducing NO interference in the atmosphere improves the accuracy of measurement.
Description
Technical Field
The utility model relates to an atmospheric environment monitoring facilities technical field, concretely relates to total reactive's of on-line measurement OH reaction tube and have its measurement system.
Background
Ozone is an important air pollutant in near-ground atmosphere, particularly in the triangle area, ozone becomes the primary pollutant in the atmosphere, and a great deal of research shows that higher ozone concentration level can not only seriously threaten the physical and mental health safety of people, but also cause large-area yield reduction of crops and accelerate the aging speed of building materials. In addition, ozone is also an important greenhouse gas. The concentration of ozone in the atmosphere is mainly determined by Nitrogen Oxides (NO)X) And Volatile Organic Compounds (VOCs), so that certain policy support can be provided for emission reduction of ozone by researching an oxidation mechanism of NOx and VOCs in the atmosphere, but due to the fact that chemical reactions among pollutants in the atmosphere are complex, all pollutants in the atmosphere cannot be accurately measured by the existing measuring technology, particularly organic pollutants generated secondarily, and the contribution of unknown organic pollutants to ozone generation is difficult to accurately calculate. In recent years, researchers have proposed that the measurement of total atmospheric OH reactivity, which is the difference between the total atmospheric OH reactivity and the actually measured total atmospheric OH pollutant contribution, is referred to as the activity loss, can help to understand the ozone generation contribution of unknown organic pollutants. The contribution of the unknown contaminant to ozone production with missing activity can be calculated using a "box" model.
At present, the methods for measuring the total OH reactivity in the atmosphere mainly comprise a laser-induced fluorescence flow tube method, a laser-induced fluorescence flash photolysis method and a relative reactivity measurement method (CRM). The laser-induced fluorescence flow tube method and the laser-induced fluorescence flash photolysis method directly measure the total OH reactivity by directly measuring the attenuation degree of OH, and the CRM method indirectly measures the total OH reactivity by measuring the reaction between pyrrole as a reference species and OH free radicals. The CRM method has the advantages of simple operation, low operation cost, convenience in transportation and maintenance and the like, and is popular with researchers.
The CRM method is to generate OH free radicals by photolyzing water vapor through an ultraviolet lamp, but the OH free radicals generated by photolyzing the water vapor can generate the same amount of H, and the H is easy to react with oxygen in sample gas to generate HO2Free radicals, HO2The free radicals react with Nitric Oxide (NO) in the sample gas to generate OH free radicals, the regeneration of the OH free radicals affects the concentration of pyrrole in the measurement process, and directly affects the accuracy of the measurement result, and a relative reactivity reaction tube (CRM reaction tube) is a core component in a relative reactivity measurement method (CRM), so it is urgently needed to design a reaction tube to solve the interference of NO in the sample gas on the concentration of the OH free radicals so as to improve the accuracy of the measurement result.
SUMMERY OF THE UTILITY MODEL
The utility model aims at overcoming the defects of the prior art, and providing a reaction tube for online measurement of OH total reaction activity, which has simple and reasonable structure and high accuracy. The utility model also provides an easy operation, the high measurement system who has above-mentioned total reactive reaction of on-line measuring OH of accuracy's reaction tube.
The purpose of the utility model is realized through the following technical scheme: a reaction tube comprises a main reaction chamber, a first air inlet arm, a second air inlet arm, an air outlet arm and a reflecting chamber; the first air inlet arm comprises a main channel, a first support arm and a second support arm; the first support arm and the second support arm are communicated with the main channel, the main channel is obliquely arranged at one end of the main reaction chamber and is communicated with the main reaction chamber, the second air inlet arm is obliquely arranged at one end of the main reaction chamber and is communicated with the main reaction chamber, the axis of the main channel and the axis of the second air inlet arm are intersected in the main reaction chamber, the top end of the reflection chamber is communicated with the main reaction chamber, the bottom end of the reflection chamber is gradually reduced to be closed, the axis of the main channel sequentially penetrates through the inner cavities of the main reaction chamber and the reflection chamber, and the air outlet arm is arranged at the other end of the main reaction chamber in the horizontal direction.
Further, the main channel comprises a large-diameter section and a small-diameter section which are coaxially arranged, one end of the small-diameter section is communicated with one end of the large-diameter section, the other end of the small-diameter section is communicated with the main reaction chamber, the first support arm is communicated with the large-diameter section, and the second support arm is communicated with the small-diameter section.
Further, the first support arm and the second support arm are perpendicular to the main channel.
Further, the axis of the main channel and the axis of the second air inlet arm are symmetrical along the horizontal axis of the main reaction chamber, and the axis of the main channel and the axis of the second air inlet arm form an included angle of 90 degrees.
Further, a sensor insertion arm is also included, which is in vertical communication with the main reaction chamber and is adjacent to the gas outlet arm.
Further, the side wall of the reflecting chamber is in a curve shape with smooth transition.
Furthermore, the main reaction chamber, the first air inlet arm, the second air inlet arm, the air outlet arm, the sensor insertion arm and the reflection chamber are all made of glass.
A measuring system comprises a reaction tube, an ultraviolet lamp irradiation system, an air inlet system, an air outlet system and a pressure and temperature detection system; the ultraviolet lamp irradiation system is connected with the other end of the main channel, the air inlet system is respectively connected with the first support arm, the second support arm and the second air inlet arm, the air outlet system is connected with the air outlet arm, the pressure and temperature detection system is connected with the sensor insertion arm, and the reaction tube is the reaction tube.
Furthermore, the air inlet system comprises a dry/wet nitrogen inlet assembly, an NO/zero air inlet assembly and a pyrrole standard air/zero air/sample air inlet assembly, the dry/wet nitrogen inlet assembly is connected with the first support arm, the NO/zero air inlet assembly is connected with the second support arm, and the pyrrole standard air/zero air/sample air inlet assembly is connected with the second air inlet arm.
Further, the ultraviolet lamp irradiation system includes a pen type ultraviolet lamp inserted into the other end of the main channel.
Compared with the prior art, the utility model have following advantage:
1. the reaction tubeThe first support arm is connected with a dry/wet nitrogen gas inlet assembly, the second support arm is connected with an NO/zero air gas inlet assembly, the second gas inlet arm is connected with a pyrrole standard gas/zero air/sample gas inlet assembly, in the measuring process, NO standard gas with certain concentration is led in through the second support arm, H generated by photolysis of water vapor entering along with high-purity nitrogen gas in the first support arm reacts with oxygen in zero air to generate HO2Free radicals, then HO2The free radical reacts with NO to generate OH free radical, ensuring HO before entering the main reaction chamber2The free radicals are completely consumed, thereby eliminating NO and HO in the sample gas2The interference of OH free radicals generated by the free radical reaction ensures the accuracy of the measurement result. The reaction tube can realize accurate measurement of total OH reaction activity under the condition of high NOx.
2. The reflecting chamber in the reaction tube is in a horn shape, incident ultraviolet rays enter the reflecting chamber and are reflected in the reflecting chamber to finally disappear at the end, and the phenomenon that the ultraviolet rays are repeatedly reflected in the whole main reaction chamber to cause excessive photochemical reaction is avoided. The main channel in the reaction tube comprises a large-diameter section and a small-diameter section, wherein the joint of the large-diameter section and the small-diameter section is provided with a concave step surface, and the step surface can be used for blocking a part of ultraviolet rays from entering a main reaction chamber and preventing excessive photochemical reaction.
3. The utility model provides a measurement system, convenient for material collection, the equipment is simple, and maneuverability is strong, can realize the total reactive accurate measurement of OH under the high NOx condition.
Drawings
The accompanying drawings, which form a part of the present application, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. In the drawings:
figure 1 shows a schematic structural view of a reaction tube according to the present invention;
fig. 2 shows a schematic structural view of a measuring system according to the invention;
in the figure, 1 is the main reaction chamber; 2 is a sensor insertion arm; 3 is a second air inlet arm; 4 is an air outlet arm; 5 is a reflecting chamber; 6 is a main channel; 7 is a first support arm; 8 is a second support arm; 9 is a large-diameter section; 10 is a small diameter section; 11 is a pen-shaped ultraviolet lamp; 12 is a high-purity nitrogen cylinder; 13 is a humidifying bottle; 14 is a first three-way electromagnetic valve; 15 is a mass flow controller; 16 is an NO gas cylinder; 17 is a first zero-air cylinder; 18 is a pyrrole standard gas bottle; 19 is a second zero-air cylinder; 20 is a sample gas inlet pipe; 21 is a second three-way electromagnetic valve; 22 is a proton transfer reaction mass spectrometer; 23 is a flow pump; 24 is a bypass; and 25 is a pressure/temperature sensor.
Detailed Description
The present invention will be further explained with reference to the drawings and examples.
The reaction tube shown in fig. 1 comprises a main reaction chamber 1, a first air inlet arm, a second air inlet arm 3, an air outlet arm 4 and a reflection chamber 5; the first air inlet arm comprises a main channel 6, a first support arm 7 and a second support arm 8; the first support arm 7 and the second support arm 8 are both communicated with the main channel 6, the main channel 6 is obliquely arranged at one end of the main reaction chamber 1 and is communicated with the main reaction chamber 1, the second air inlet arm 3 is obliquely arranged at one end of the main reaction chamber 1 and is communicated with the main reaction chamber 1, the axis of the main channel 6 and the axis of the second air inlet arm 3 are intersected in the main reaction chamber 1, the top end of the reflection chamber 5 is communicated with the main reaction chamber 1, the bottom end of the reflection chamber 5 is gradually reduced to be closed, the axis of the main channel 6 sequentially penetrates through the inner cavities of the main reaction chamber 1 and the reflection chamber 5, and the air outlet arm 4 is arranged at the other end of the main reaction chamber 1 along the horizontal direction. A first support arm 7 in the reaction tube is connected with a dry/wet nitrogen gas inlet assembly, a second support arm 8 is connected with an NO/zero air gas inlet assembly, a second gas inlet arm 3 is connected with a pyrrole standard gas/zero air/sample gas inlet assembly, in the measuring process, NO standard gas with certain concentration is led in through the second support arm 8, H generated by water vapor photolysis entering along with high-purity nitrogen gas in the first support arm 7 reacts with oxygen in zero air to generate HO2Free radicals, then HO2The free radicals react with NO rapidly to generate OH free radicals, ensuring HO before entering the main reaction chamber 12The free radicals are completely consumed, thereby eliminating NO and HO in the sample gas2The interference of OH free radicals generated by the free radical reaction can be avoided, and the OH free radicals in the main reaction chamber 1 can be avoidedThe base concentration fluctuates, the concentration of pyrrole is influenced, and the measurement result is influenced.
The reflecting chamber 5 is horn-shaped, the whole body and the main reaction chamber form an angle of 45 degrees, the side wall of the reflecting chamber 5 is in a curve shape with smooth transition, the bottom end of the reflecting chamber 5 is a tip end, the tip end faces the air outlet arm, and the axis of the main channel 6 sequentially passes through the inner cavities of the main reaction chamber 1 and the reflecting chamber 5. By this arrangement, the ultraviolet light entering from the main channel 6 enters the reflection chamber and is reflected in the reflection chamber 5 and finally disappears at the end, thereby avoiding the repeated reflection of the ultraviolet light in the whole main reaction chamber and causing excessive photochemical reaction.
The main channel 6 comprises a large-diameter section 9 and a small-diameter section 10 which are coaxially arranged, one end of the small-diameter section 10 is communicated with one end of the large-diameter section 9, the other end of the small-diameter section 10 is communicated with the main reaction chamber 1, the first support arm 7 is communicated with the large-diameter section 9, and the second support arm 8 is communicated with the small-diameter section 10. Through the arrangement, the joint of the large-diameter section 9 and the small-diameter section 10 is a concave step surface towards the axis of the main channel 6, and the step surface can be used for blocking a part of ultraviolet rays from entering the main reaction chamber 1 and preventing excessive photochemical reaction. Specifically, the large diameter section may be 1/2 inches in diameter and the small diameter section may be 1/4 inches in diameter.
The first arm 7 and the second arm 8 are perpendicular to the main channel 6. By this arrangement, the flow velocity of the gas can be increased, and the reaction rate in the main channel 6 can be increased.
The axis of the main channel 6 and the axis of the second air inlet arm 3 are symmetrical along the horizontal axis of the main reaction chamber 1, and the axis of the main channel 6 and the axis of the second air inlet arm 3 form an included angle of 90 degrees. By this arrangement, the contact efficiency between the gases introduced from the main passage 6 and the second gas inlet arm 3 can be improved, and the reaction efficiency can be improved.
And a sensor insertion arm 2, wherein the sensor insertion arm 2 is communicated with the main reaction chamber 1 along the vertical direction and is close to the gas outlet arm 4. The sensor insertion arm 2 is inserted with a pressure/temperature sensor through a Teflon (Teflon) joint for detecting real-time pressure and temperature in the main reaction chamber 1.
The main reaction chamber 1, the first air inlet arm, the second air inlet arm 3, the air outlet arm 4, the sensor insertion arm 2 and the reflection chamber 5 are all made of glass. Convenient material taking, convenient processing and low cost.
As shown in fig. 2, a measuring system includes a reaction tube, an ultraviolet lamp irradiation system, an air inlet system, an air outlet system, and a pressure and temperature detection system; the ultraviolet lamp irradiation system is connected with the other end of the main channel, the air inlet system is respectively connected with the first support arm 7, the second support arm 8 and the second air inlet arm 3, the air outlet system is connected with the air outlet arm 4, the pressure and temperature detection system is connected with the sensor insertion arm 2, and the reaction tube is the reaction tube. When the ports of the reaction tube are connected with the ultraviolet lamp irradiation system, the air inlet system, the air outlet system and the pressure and temperature detection system, Teflon joints are adopted for connection so as to prevent the influence on the gas in the main reaction chamber.
The air inlet system comprises a dry/wet nitrogen inlet assembly, an NO/zero air inlet assembly and a pyrrole standard gas/zero air/sample gas inlet assembly, the dry/wet nitrogen inlet assembly is connected with a first supporting arm 7, the NO/zero air inlet assembly is connected with a second supporting arm 8, and the pyrrole standard gas/zero air/sample gas inlet assembly is connected with a second air inlet arm 3.
Wherein, the dry/wet nitrogen gas inlet component comprises a high-purity nitrogen gas bottle 12, a humidifying bottle 13 and a first three-way electromagnetic valve 14; the outlet end of the high-purity nitrogen gas cylinder 12 is connected with the inlet end of a first three-way electromagnetic valve 14 through a mass flow controller 15, the inlet end of a humidifying cylinder 13 is connected with one outlet end of the first three-way electromagnetic valve 14, the outlet end of the humidifying cylinder 13 is connected with a first support arm through a Teflon connector, and the other outlet end of the first three-way electromagnetic valve 14 is connected with the first support arm 7 through a Teflon connector. As shown in fig. 2, the outlet end of the humidifying bottle 13 and the other outlet end of the first three-way solenoid valve 14 are converged together by a pipe and then connected to the first arm 7 through the same Teflon fitting. Whether the high-purity nitrogen gas entering the first branch arm 7 needs to be humidified or not is controlled by a first three-way electromagnetic valve 14.
The NO/zero air inlet assembly comprises an NO gas bottle 16 and a first zero air gas bottle 17; the outlet ends of the NO gas bottle 16 and the first zero-air gas bottle 17 are respectively corresponding to the two inlet ends of a three-way Teflon connector through a mass flow controller 15The outlet end of the three-way Teflon joint is connected with the second support arm 8. Zero air is used as carrier gas to lead NO with certain concentration into the second support arm 8, so as to lead HO generated by water vapor photolysis2And the free radicals are completely consumed, so that the interference of NO in the sample gas on the concentration of the OH free radicals is eliminated.
The pyrrole standard gas/zero air/sample gas inlet assembly comprises a pyrrole standard gas bottle 18, a second zero air bottle 19, a sample gas inlet pipe 20, a main gas inlet pipe and a second three-way electromagnetic valve 21, wherein the two ends of the main gas inlet pipe are respectively connected with the pyrrole standard gas bottle 18 and the second gas inlet arm 3, the outlet ends of the sample gas inlet pipe 20 and the second zero air bottle 19 are respectively connected with the two inlet ends of the second three-way electromagnetic valve 21, and the outlet end of the second three-way electromagnetic valve 21 is connected with the second gas inlet arm 3 through the main gas inlet pipe. Wherein, the outlet end of the pyrrole standard gas bottle 18 and the outlet end of the second zero air bottle 19 are both provided with a mass flow controller 15. The second three-way electromagnetic valve 21 controls the sample gas as the carrier gas to continuously feed the pyrrole standard gas into the main reaction chamber 1 or the zero air as the carrier gas to continuously feed the pyrrole standard gas into the main reaction chamber 1. Wherein the inlet end of the sample gas inlet tube 20 is disposed in the atmosphere to be measured.
The gas outlet system comprises a proton transfer reaction mass spectrometer 22(PTR-MS) and a flow pump 23; the flow pump 23 is made of Teflon, the mass flow controller 15 is connected with the gas outlet arm 4 through a Teflon connector, one end of the flow pump 23 is connected with the mass flow controller 15, and the other end of the flow pump 23 is connected with the proton transfer reaction mass spectrometer 22. Gas communicating with each gas inlet arm is pumped into the main reaction chamber 1 by a flow pump 23, the total flow of the flow pump 23 is controlled by a mass flow controller 15, and a proton transfer reaction mass spectrometer 22(PTR-MS) measures the concentration of the reference species pyrrole in the main reaction chamber 1. And a bypass 24(bypass) for discharging excess gas through the bypass 24 when the amount of gas discharged from the main reaction chamber 1 is larger than the amount of gas introduced into the mass spectrometer 22 for proton transfer reaction.
The pressure temperature detection system includes a pressure/temperature sensor 25 inserted into the main reaction chamber 1 through a Teflon (Teflon) joint for monitoring the reaction temperature and pressure in real time.
The uv lamp irradiation system includes a pen-shaped uv lamp 11 inserted into the other end of the main channel 6. The direction of the arrow in fig. 1 is the ultraviolet lamp irradiation direction. The pen-type ultraviolet lamp 11 was placed in the 1/2 inch diameter main channel 6 through an 1/2-turn 1/4Teflon fitting.
During the specific use, place the reaction tube on the support, whole measurement system is located the atmospheric environment that awaits measuring, connects ultraviolet lamp irradiation system, air intake system, air outlet system and pressure temperature detecting system with main reaction tube in proper order, and the entrance point of sample gas inlet tube 20 is directly arranged in the atmospheric environment that awaits measuring. The measuring process is mainly divided into the following working conditions:
c0 operating condition: the pyrrole standard gas/zero air/sample gas inlet assembly leads pyrrole with certain concentration into the main reaction chamber 1 through the second gas inlet arm by taking zero air as carrier gas, the dry/wet nitrogen gas inlet assembly leads dry high-purity nitrogen with certain flow rate through the first support arm 7, and the ultraviolet lamp is closed, wherein the pyrrole concentration is called as C0 working condition;
c1 operating condition: on the basis of a CO working condition, an ultraviolet lamp is turned on, partial photolysis of pyrrole in the main reaction chamber 1 occurs, and the concentration of the pyrrole is called as a C1 working condition;
c2 operating condition: on the basis of the C1 working condition, the wet/dry nitrogen gas inlet assembly is filled with humidified high-purity nitrogen gas through the first support arm 7, the NO/zero air inlet assembly is filled with NO standard gas with a certain concentration through the second support arm 8, the ultraviolet lamp is turned on, water vapor entering along with the nitrogen gas can generate H and OH free radicals under the irradiation of the ultraviolet lamp, and the H and zero air react to generate HO2Free radicals, then HO2The free radicals react with NO entering through the second support arm 8 to generate OH free radicals, the OH free radicals enter the main reaction cavity 1 to react with pyrrole, and the concentration of the pyrrole is called as C2 working condition;
c3 operating condition: the zero gas of the second gas inlet arm 3 is changed into sample gas on the basis of the working condition of C2, pyrrole with a certain concentration is introduced into the main reaction chamber by taking the sample gas as carrier gas, pollutants in the sample gas react with OH free radicals, and the pollutants in the sample gas and the pyrrole react with the OH free radicals in a competition manner (namely, the pollutants in the sample gas and the pyrrole react with the OH free radicals), so that the concentration of the pyrrole in the main reaction chamber 1 is increased, which is called as the working condition of C3.
On the basis of the above measurements, the sample gas or the reactivity of the sample gas can be calculated according to the following formula:
wherein c1, c2 and c3 have the same meanings as described above, the pyrrole concentration of the reference species under different working conditions is shown, kx represents the OH reaction rate constant of the known pyrrole of the reference species, and k isOHThe result of the measured reactivity of the sample gas.
In the measurement process, water vapor entering along with nitrogen can generate H and OH free radicals under the irradiation of an ultraviolet lamp, and H and zero air react to generate HO2Free radicals, then HO2The free radical reacts with NO entering through the second support arm 8 to generate OH free radical, H generated by water vapor photolysis can be completely consumed by arranging the second support arm 8 and the NO/zero air inlet assembly, OH free radical is guaranteed to enter the main reaction chamber 1, the influence of NO in sample gas on the concentration of the OH free radical is eliminated, the constancy of the concentration of the OH free radical in the main reaction chamber 1 is guaranteed, the accuracy of measurement is guaranteed, and the accurate measurement of the total OH reaction activity under the high NOx condition is realized.
The above-mentioned specific implementation is the preferred embodiment of the present invention, can not be right the utility model discloses the limit, any other does not deviate from the technical scheme of the utility model and the change or other equivalent replacement modes of doing all contain within the scope of protection of the utility model.
Claims (10)
1. A reaction tube for on-line measurement of total OH reactivity is characterized in that: comprises a main reaction chamber, a first air inlet arm, a second air inlet arm, an air outlet arm and a reflecting chamber; the first air inlet arm comprises a main channel, a first support arm and a second support arm; the first support arm and the second support arm are communicated with the main channel, the main channel is obliquely arranged at one end of the main reaction chamber and is communicated with the main reaction chamber, the second air inlet arm is obliquely arranged at one end of the main reaction chamber and is communicated with the main reaction chamber, the axis of the main channel and the axis of the second air inlet arm are intersected in the main reaction chamber, the top end of the reflection chamber is communicated with the main reaction chamber, the bottom end of the reflection chamber is gradually reduced to be closed, the axis of the main channel sequentially penetrates through the inner cavities of the main reaction chamber and the reflection chamber, and the air outlet arm is arranged at the other end of the main reaction chamber in the horizontal direction.
2. The reaction tube for on-line measurement of OH total reactivity according to claim 1, wherein: the main channel comprises a large-diameter section and a small-diameter section which are coaxially arranged, one end of the small-diameter section is communicated with one end of the large-diameter section, the other end of the small-diameter section is communicated with the main reaction chamber, the first support arm is communicated with the large-diameter section, and the second support arm is communicated with the small-diameter section.
3. The reaction tube for on-line measurement of OH total reactivity according to claim 1, wherein: the first support arm and the second support arm are both perpendicular to the main channel.
4. The reaction tube for on-line measurement of OH total reactivity according to claim 1, wherein: the axis of the main channel and the axis of the second air inlet arm are symmetrical along the horizontal axis of the main reaction chamber, and an included angle of 90 degrees is formed between the axis of the main channel and the axis of the second air inlet arm.
5. The reaction tube for on-line measurement of OH total reactivity according to claim 1, wherein: the device also comprises a sensor insertion arm which is communicated with the main reaction chamber along the vertical direction and is close to the air outlet arm.
6. The reaction tube for on-line measurement of total OH reactivity according to claim 5, wherein: the main reaction chamber, the first air inlet arm, the second air inlet arm, the air outlet arm, the sensor insertion arm and the reflection chamber are all made of glass.
7. The reaction tube for on-line measurement of OH total reactivity according to claim 1, wherein: the side wall of the reflecting chamber is in a curve shape with smooth transition.
8. A measurement system, characterized by: comprises a reaction tube, an ultraviolet lamp irradiation system, an air inlet system, an air outlet system and a pressure and temperature detection system; the ultraviolet lamp irradiation system is connected with the other end of the main channel, the air inlet system is respectively connected with the first support arm, the second support arm and the second air inlet arm, the air outlet system is connected with the air outlet arm, the pressure and temperature detection system is connected with the sensor insertion arm, and the reaction tube is the reaction tube in any one of the claims 1-7.
9. The measurement system of claim 8, wherein: the air inlet system comprises a dry/wet nitrogen inlet assembly, an NO/zero air inlet assembly and a pyrrole standard air/zero air/sample air inlet assembly, the dry/wet nitrogen inlet assembly is connected with a first support arm, the NO/zero air inlet assembly is connected with a second support arm, and the pyrrole standard air/zero air/sample air inlet assembly is connected with the second air inlet arm.
10. The measurement system of claim 8, wherein: the UV lamp irradiation system includes a pen-shaped UV lamp inserted into the other end of the main channel.
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