CN215139933U - Aerosol nucleation turbulent flow tube reactor capable of continuously adjusting reaction time - Google Patents
Aerosol nucleation turbulent flow tube reactor capable of continuously adjusting reaction time Download PDFInfo
- Publication number
- CN215139933U CN215139933U CN202120178648.3U CN202120178648U CN215139933U CN 215139933 U CN215139933 U CN 215139933U CN 202120178648 U CN202120178648 U CN 202120178648U CN 215139933 U CN215139933 U CN 215139933U
- Authority
- CN
- China
- Prior art keywords
- sample
- sampling
- sample inlet
- tube
- area
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Abstract
The utility model relates to a but continuous regulation reaction time's aerosol nucleation torrent flow tube reactor, its characterized in that: the reactor comprises an inner tube with the length-diameter ratio of 50-100, a drawable sample inlet tube, a sample inlet sealing end cover, a sample outlet sealing end cover and a drawable sampling tube; one end of the inner tube is a sample introduction end, and the other end of the inner tube is a sample discharge end; the inner tube comprises a sampling area with adjustable sampling position, a nucleation area and a sampling area with adjustable sampling position; the sample inlet end is positioned in the sample inlet area, and the sample outlet end is positioned in the sampling area; the sample inlet end of the sample inlet area is provided with a sample inlet sealing end cover, and the sample inlet pipe can be pulled to be matched with the sample inlet sealing end cover for use; the appearance end of sampling district is provided with out appearance mouth end cover, but the pull sampling pipe uses with a sample mouth end cover cooperation. The utility model discloses can be used to study the dynamics of aerosol nucleation, but have continuous adjustment reaction time, wall loss little, easy operation, easy repeated experiment, the characteristics of easy maintenance.
Description
Technical Field
The utility model belongs to atmospheric chemistry experiment research field, concretely relates to but continuous adjustment reaction time's aerosol nucleation torrent flow tube reactor.
Background
The dust haze problem is a serious environmental problem faced by China in recent years. Dust haze itself is an aerosol, where PM2.5, i.e., liquid or solid aerosol particles dispersed in air with a diameter less than or equal to 2.5 microns, has now become a major pollutant in the atmospheric environment. Atmospheric aerosol particles have a significant impact on the earth's atmospheric circulation system, including air quality, weather, global climate, ecosystem, and public health. Wherein, the aerosol influences the climate through direct radiation and aerosol-cloud interaction, namely indirect radiation forcing, and the reports of the special committee on climate change among governments indicate that the indirect radiation forcing is still the largest uncertainty factor in the aspect of evaluating the climate change. The aerosol mainly comes from primary particles and secondary particles, and the number concentration of particulate matters with 3-7nm (or 10nm and the like) in the atmosphere is increased sharply along with the change of time, and the process is called New Particle Formation (NPF). More than half of the cloud condensation nuclei worldwide come from new particle generation. The process of atmospheric new particle generation generally comprises two key stages: first, low volatility gas molecules, such as sulfuric acid, overcome the energy barrier to form a nucleation process of critical molecular clusters, which is critical clusters corresponding to a cluster size threshold above which clusters will be more likely to grow rather than evaporate. This is followed by a growth process in which the critical molecular clusters spontaneously grow into nano-sized particles. Nucleation at the molecular level, usually by hydrogen bonding, forms stable clusters of molecules (less than 3nm) that may contain single or multiple species, is key to understanding the mechanism of new particle generation. The key elements are to obtain the components and structures of the precursor, the intermediate and the product, the nucleation conditions and the nucleation rate, and the laboratory simulation, the external field observation and the theoretical calculation are the means for connecting the elements together.
The aerosol nucleation process is the research hotspot of environmental scientists and chemists at present, but because the particles of the aerosol condensation nucleus are very small and difficult to capture, many wars and blanks still exist for researching the nucleation mechanism of the aerosol. The research of secondary aerosol formation traditionally uses smog chamber experimental apparatus, and is unanimous in environmental condition through controlling concentrations such as oxidant, VOCs, along with time, detects different gaseous phase and particle phase composition and concentration change. The smoke box experiment is applicable to systems that react relatively slowly. For example, BVOC photooxidation processes such as pinenes, biomass combustion and photooxidation products, etc. The smoke box experiment has some limitations, generally, the loss of the wall of the smoke box is serious, the experiment researches the chemistry of the trace gas under the condition that the chemical concentration of the trace gas is far greater than the real atmospheric concentration, and the application of the reaction result to the inference of a chemical mechanism is seriously limited. The turbulent flow tube can ignore the wall loss of the reaction gas and is very suitable for kinetic study. The invention and the establishment of the turbulent flow tube reactor with controllable reaction time and within the second order are the basis and the important step of the research of the aerosol nucleation experiment.
SUMMERY OF THE UTILITY MODEL
The utility model aims at overcoming the defects of the prior art, deeply researching the dynamic process of aerosol nucleation and providing an aerosol nucleation turbulent flow tube reactor capable of continuously adjusting the reaction time.
The utility model adopts the technical scheme as follows:
an aerosol nucleation turbulent flow tube reactor with continuously adjustable reaction time, characterized in that: the reactor comprises an inner tube with the length-diameter ratio of 50-100, a drawable sample inlet tube, a sample inlet sealing end cover, a sample outlet sealing end cover and a drawable sampling tube; one end of the inner tube is a sample introduction end, and the other end of the inner tube is a sample discharge end; the inner tube comprises a sampling area with adjustable sampling position, a nucleation area and a sampling area with adjustable sampling position; the sample inlet end is positioned in the sample inlet area, and the sample outlet end is positioned in the sampling area; the sample inlet end of the sample inlet area is provided with a sample inlet sealing end cover, and the sample inlet pipe can be pulled to be matched with the sample inlet sealing end cover for use; the appearance end of sampling district is provided with out appearance mouth end cover, but the pull sampling pipe uses with a sample mouth end cover cooperation.
Wherein the inner tube is a tubular reaction chamber. The aspect ratio is the ratio of the total length of the inner tube to the inner diameter of the inner tube. The sample injection area is a gas mixing area, is not wrapped by a shell and is exposed at room temperature. The nucleation area is an aerosol nucleation area, and an outer tube is sleeved outside the nucleation area and is of a water-bath temperature-control double-layer structure. The sampling area capable of adjusting the sampling position is an aerosol sampling area, is not wrapped by a shell and is exposed at room temperature.
Optionally, the turbulent flow tube reactor with high aspect ratio is used as an aerosol nucleation flow reaction chamber, a shell structure and quartz glass, the total length of the inner tube is 130cm, the inner diameter is 2cm, and the length-diameter ratio is up to 65. When the total flow of gases (nucleating precursor and carrier gas) is above 30 standard liters per minute, the reactant flow is turbulent (reynolds number Re ═ u ρ L/μ > 2000 where u, ρ, L, μ are flow rate, gas density, inside diameter of the tube, gas viscosity, respectively). The carrier gas used is "zero air", which is zero-order air obtained by removing carbon dioxide and other trace impurities from the dry air.
Optionally, a drawable sample inlet pipe, a sample inlet end cover, a fixed sample inlet, a primary sampling port, a temperature and humidity detection port, a rear-stage sampling port, a sample outlet end cover and a drawable sampling pipe are sequentially arranged on the inner pipe.
Optionally, the fixed sample inlet is arranged in a sample inlet area of an adjustable sample inlet position, the primary sampling port is arranged in a nucleation area, and the temperature and humidity detection port and the rear-stage sampling port are arranged in a sampling area of an adjustable sampling position. The primary sampling port is used as a fixed sample inlet.
Optionally, the reactor further comprises an outer tube, the outer tube is sleeved outside the nucleation region, and a water bath interlayer is formed between the outer tube and the nucleation region; and the outer pipe is sequentially provided with a water bath outlet and a water bath inlet.
Optionally, the inner tube is made of quartz glass and has a length-diameter ratio of 65.
Optionally, the temperature and humidity detection port is arranged in a sampling area of the adjustable sampling position, the temperature and humidity detection port is provided with a temperature and humidity meter, wherein the nucleation area outer pipe water bath controls the nucleation temperature of the aerosol, and the nucleation temperature is monitored by the temperature and humidity meter in real time.
Optionally, the drawable sample inlet pipe and the sample inlet sealing end cover are fixed by a stainless steel ball milling clamp; the drawable sampling tube and the sample outlet sealing end cover are fixed by a stainless steel ball milling clamp.
Optionally, the primary sampling ports comprise three primary sampling ports, the three primary sampling ports are uniformly distributed on the nucleation region, and the primary sampling ports are used as fixed sample injection ports; the fixed sample inlet comprises four fixed sample inlets which are uniformly distributed on a sample inlet area with an adjustable sample inlet position.
Optionally, the drawable sampling tube and the drawable sampling tube are both made of quartz glass.
Optionally, the drawable sample inlet tube is axially disposed along the inner tube.
Optionally, the drawable sampling tube is axially disposed along the inner tube.
Optionally, the flow tube reactor is an open integrated structure of gas mixing, aerosol nucleation and aerosol sampling; the mixing area is a section which is 10cm long at the front end, and no shell wraps the exposed part at room temperature; because reactant flow is in the turbulent flow state for it is more abundant than the laminar flow to mix to become, need not device and operation such as extra heating or stirring, 4 external diameters of evenly distributed are 1/4 inches size sample introduction pipes respectively, can realize 4 different kinds of nucleation precursor and advance the appearance simultaneously. Then a nucleation area with the length of 110 cm; an outer pipe is sleeved outside the nucleation area, a water bath interlayer is formed between the outer pipe and the inner pipe, and the water bath of the outer pipe controls the nucleation temperature of the aerosol to be between several and dozens of DEG; this portion had a sampling port with an outer diameter of 1/4 inches every 27cm, i.e., three pre-stage sampling ports. Finally, the sampling part is distributed by 2 sampling ports with outer diameters of 1/4 inches and 1/2 inches at the later stage and the length of about 10 cm; the device can be connected with various aerosol detection and analysis instruments for use, and the temperature and humidity of the sampled aerosol are monitored by a hygrothermograph in real time; wherein the hygrothermograph is arranged at the temperature and humidity detection port.
Optionally, the sample inlet comprises two sample inlet tubes which are fixed and can be drawn for sample introduction, and the sample outlet comprises two sample sampling tubes which are fixed and can be drawn for sample extraction. Both the drawable sample tube and the drawable sample tube were 70cm long with an outer diameter of 1/4 inches. Wherein the tail end of the drawable sample inlet pipe is of a shower head structure; and the reactant and other gases can be fully mixed from the sample inlet. The two are respectively fixed with the sample inlet and outlet sealing end covers by stainless steel ball milling clamps, thus realizing continuous adjustment of sample inlet and outlet positions and further realizing continuous adjustment of nucleation reaction time. Wherein, the gondola water faucet structure for toper "gondola water faucet" structure, the end is covered with the aperture, is favorable to following this introduction port reactant and other gaseous intensive mixing.
Optionally, the drawable sample inlet tube and the drawable sample inlet tube are made of quartz glass and are used together with the sealing end cap. The middle of the end cap is a standard 1/4 inch adapter and the nut fits and mates with an O-ring squeeze seal.
Optionally, the inner tube is a straight tube.
The utility model also provides an application of foretell flow tube reactor in sulphuric acid-water-dimethylamine ternary nucleation reaction.
The principle of the utility model is that: in the aerosol nucleation turbulent flow tube reactor capable of continuously adjusting the reaction time, the sample gas reaches a nucleation area with suddenly-reduced temperature after being rapidly mixed to reach turbulent flow to generate molecular clusters for further nucleation, the particle number continuously rises, the particle size continuously grows, and the particles quickly reach a detection area for detection. And acquiring molecular clusters and aerosol particles subjected to different residence times through drawing in and sampling pipes and at different sampling ports to obtain cluster component information and particle nucleation rate. By controlling the concentration and temperature and humidity of different precursors, different cluster components and nucleation rates are obtained, and the nucleation kinetic process is researched.
The beneficial effects of utility model are that:
(1) utilize the utility model discloses can realize aerosol nucleation process fast, utilize the critical sulfuric acid concentration that detection and analysis instrument can acquire aerosol nucleation, suitable humiture is difficult to the molecular cluster of catching in the atmosphere, and then simulates actual atmospheric aerosol nucleation process. The method provides convenience for researching the kinetic mechanism of aerosol nucleation;
(2) the utility model can realize the continuous adjustment of nucleation time, compared with the design of fixed sampling ports at different positions to realize the adjustment of nucleation time, the utility model can realize the continuous adjustment of nucleation reaction time by drawing in and out the sample tubes;
(3) the utility model has large length-diameter ratio, the reactant flow is easy to realize turbulence, and the loss of gas wall is reduced; shorter residence times also contribute to the critical substances for the nucleation process: capturing and detecting the molecular clusters;
(4) the utility model adopts the mode that the flowing pipe end cover is fixed and sealed by the stainless steel ball milling clamp, which has simple operation and good effect;
(5) the flow pipe is small and exquisite, is easy to connect and disassemble, and is very convenient to transfer and clean.
The utility model has the advantages that:
the utility model has the characteristics of but continuous adjustment reaction time, wall loss are little, easy operation, easy repetition experiment, easy maintenance.
Drawings
FIG. 1: the utility model relates to an aerosol nucleation torrent flow tube reactor schematic diagram that can continuous adjustment reaction time.
FIG. 2: the utility model discloses end cover structure sketch map that the level was placed.
FIG. 3: the utility model discloses take flow tube plan view of size mark.
Wherein the dimensions are in millimeters.
FIG. 4: the embodiment of the utility model provides an embodiment particle number concentration is along with sulphuric acid flow variation relational graph.
In the figure, 1-a drawable sample inlet pipe, 2-a sample inlet sealing end cover, 3-a fixed sample inlet, 3.1-a fixed sample inlet, 3.2-a fixed sample inlet, 3.3-a fixed sample inlet, 3.4-a fixed sample inlet, 4-a water bath outlet, 5-a primary sample inlet, 5.1-a primary sample inlet, 5.2-a primary sample inlet, 5.3-a primary sample inlet, 6-a water bath inlet, 7-a temperature and humidity detection port, 8-a rear sample inlet, 9-a sample outlet sealing end cover and 10-a drawable sample inlet pipe.
Detailed Description
The following discussion is presented to enable a person skilled in the art to practice the invention, and is not intended to limit the invention to the embodiments shown, but is to be accorded the principles and features disclosed herein. The present invention will be further explained with reference to the accompanying drawings:
example 1
An aerosol nucleation turbulent flow tube reactor with continuously adjustable reaction time is shown in figure 1 and its dimensions are shown in figure 3, wherein the dimensions are given in millimeters. As shown in figure 1, the aerosol nucleation turbulent flow tube reactor capable of continuously adjusting reaction time is a shell structure made of quartz glass and mainly comprises an inner tube, a drawable sample inlet tube 1, a drawable sampling tube 10, an outer tube and other components, wherein the inner tube is a tubular reaction cavity, has the total length of 130cm, the inner diameter of 2cm and the length-diameter ratio of up to 65, and mainly comprises three integrated parts of a sample inlet region (I) with an adjustable sample inlet position, a nucleation region (II) and a sampling region (III) with an adjustable sampling position, and is an open integrated structure of gas mixture, aerosol nucleation and aerosol sampling. The left end of the inner tube is a sample introduction end, and the right end of the inner tube is a sample discharge end; the inner pipe is a straight pipe; the sample inlet end is positioned in the sample inlet area, and the sample outlet end is positioned in the sampling area.
Wherein, the sampling area (I) is a section which is 10cm long at the front end of the inner tube and is a gas mixing area, no shell is wrapped and exposed at room temperature, and because the reactant flow is in a turbulent flow state, the mixing is more sufficient than laminar flow, and devices and operations such as additional heating or stirring are not needed. The sample inlet area (I) is provided with a drawable sample inlet pipe 1, a sample inlet sealing end cover 2, a fixed sample inlet 3.1, a fixed sample inlet 3.3, a fixed sample inlet 3.2 and a fixed sample inlet 3.4 from left to right in sequence. Wherein the fixed sample inlet 3 comprises a fixed sample inlet 3.1, a fixed sample inlet 3.2, a fixed sample inlet 3.3 and a fixed sample inlet 3.4. The left end inlet of the sample inlet area (I) is a sample inlet end, a sample inlet sealing end cover 2 is arranged at the left end inlet of the sample inlet area (I), a drawable sample inlet pipe 1 extends into the inner pipe from the sample inlet end, the drawable sample inlet pipe 1 is arranged along the axial direction of the inner pipe, the drawable sample inlet pipe 1 is matched with the sample inlet sealing end cover 2 for use, and then a sample inlet 3 with a fixed position on the sample inlet area (I) is arranged, the sample inlet 3 comprises four fixed sample inlets 3.1-3.4, wherein the fixed sample inlets 3.1 and 3.2 are arranged on the lower part of the inner pipe, and the fixed sample inlets 3.3 and 3.4 are arranged on the upper part of the inner pipe; four fixed injection ports are uniformly distributed on the injection zone I, the injection ports are respectively connected with 4 injection pipes with the outer diameters of 1/4 inches, and the simultaneous injection of 4 different kinds of nucleation precursors can be realized. Wherein, the length of the drawable sample inlet pipe 1 is 70cm, the outer diameter is 1/4 inches, the tail end of the drawable sample inlet pipe 1 is a cone-shaped shower head structure, and the tail end is distributed with small holes which are beneficial to fully mixing the reactant and other gases from the sample inlet; the sample inlet pipe 1 and the sample inlet sealing end cover 2 are fixed by a stainless steel ball milling clamp, so that the sample inlet position is continuously adjustable, and the nucleation reaction time is continuously adjustable. The drawable sample inlet tube 1 is made of quartz glass. Injection port sealing end cap 2 as shown in fig. 2, fig. 2 shows the end cap structure placed horizontally therein, the middle of the end cap is a standard 1/4 inch adapter, and a nut is matched with an O-ring for compression sealing.
This is followed by a middle 110cm long section of the inner tube, which is the nucleation zone (two), which is the aerosol nucleation zone. The nucleation zone was provided with a sampling port of 1/4 inches outside diameter, three primary sampling ports 5.1, 5.2 and 5.3 from left to right, each of which was connected to a sampling tube, every about 27 cm. The primary sample ports 5.1, 5.2 and 5.3 also serve as fixed sample ports. The outer pipe is sleeved outside the nucleation area (II) and is of a water bath temperature control double-layer structure; form the water bath intermediate layer between outer tube and the inner tube, the water bath intermediate layer is used for storing the water of water bath for hydrologic cycle, and the right-hand member lower part of outer tube is provided with circulation water bath import 6, and the left end upper portion of outer tube is provided with water bath export 4. The outer pipe water bath of the nucleation area (II) controls the nucleation temperature of the aerosol, the precursor reactant enters the aerosol nucleation area to generate nuclei, the temperature of the part is lower according to the working principle of the flow pipe, and the temperature is controlled between several degrees and dozens of degrees in the experimental process.
Finally, an inner tube part of about 10cm in length is a sampling area (III) of adjustable sampling position, and the sampling area is an aerosol sampling area. And the sampling area (III) is not wrapped by a shell layer and is exposed at room temperature. The sampling district has set gradually temperature and humidity measurement mouth 7 from a left side to the right side, back level sample connection 8, play appearance mouth end cover 9, but pull sampling pipe 10. A hygrothermograph is arranged at the temperature and humidity detection port 7. The drawable sampling tube 10 extends into the inner tube from the sample outlet end of the sampling region (III), and the drawable sampling tube 10 is axially arranged along the inner tube. And the water bath of the nucleation area (II) controls the nucleation temperature of the aerosol, and the hygrothermograph monitors the nucleation temperature and humidity of the aerosol in real time. Wherein, back level sample connection 8 includes that 2 external diameters are 1/4 and 1/2 inches big or small back level sample connection respectively, can be connected the use with multiple aerosol detection analysis instrument, through setting up the hygrothermograph real-time supervision nucleation temperature at humiture detection mouth 7. Wherein, the rear-stage sampling port with the outer diameter of 1/2 inches is positioned at the lower part of the inner tube, and the rear-stage sampling port with the outer diameter of 1/4 inches is positioned at the upper part of the inner tube. The right-hand member export of sampling district (three) is out the appearance end, and this place is provided with out appearance mouth end cover 9, but in the sample tube 10 can stretch into the inner tube from out the appearance end, but the setting of inner tube axial is followed to pull sample tube 10, but pull sample tube 10 uses with the cooperation of play appearance mouth end cover 9. Wherein the drawable sampling tube 10 is 70cm long and 1/4 inches in outside diameter; sampling pipe 10 is fixed with a sample outlet end cover 9 with stainless steel ball-milling clamp, realizes that the appearance position lasts adjustable, and then nucleation reaction time is adjustable in succession, and the torrent can be rapid. The drawable sampling tube 10 is made of quartz glass. Outlet seal end cap configuration as also shown in fig. 2, fig. 2 shows the end cap configuration in which the end cap is placed horizontally with a standard 1/4 inch adapter in the middle of the end cap and a nut fitting to match the O-ring squeeze seal.
When the utility model is used, the used zero air is the zero air generated by a zero air generator (model 737-15, AADCO). The structure is shown in figure 1, the inner pipe of the aerosol nucleation turbulent flow tube reactor capable of continuously adjusting the reaction time is a flow pipe, wherein a drawable sample inlet pipe 1 is arranged at the front end cover of a sample inlet area (I), four fixed sample inlets 3.1-3.4 are reserved next to the sample inlet area, different substances can be introduced aiming at different research systems, the fixed sample inlet pipe is 2cm long and 6mm in outer diameter, and the four fixed sample inlets 3.1, 3.2, 3.3 and 3.4 are respectively the sample inlet pipe with the length of 2cmZero air, water vapor, supplemented zero air, Dimethylamine (DMA) vapor inlet, drawable sample injection tube into nucleation sensitive sulfuric acid (H)2SO4) And (4) steam. The specific access method is as follows: firstly, 97% concentrated sulfuric acid is injected into a bubbler, air holes are submerged in the liquid level, zero air generated by a zero air generator (model 737-15, AADCO) is introduced, a flow meter is adjusted to control the flow of sample injection steam, and a gaseous sample is fed into a flow pipe through a drawable sample injection pipe 1; similarly, ultrapure water and a prepared dimethylamine solution (volume ratio DMA: H)2O is 1: 3) respectively placing the two bubblers in the other two bubblers, and respectively blowing zero air serving as carrier gas into the flow tubes through fixed sample inlets 3.2 and 3.4; the fixed sample inlets 3.1 and 3.3 are respectively a zero air sample inlet and a supplementary zero air sample inlet, and are adjusted together with zero air flow during sample introduction, so that the relative humidity, the concentration of sulfuric acid and the concentration of dimethylamine are all adjustable under the condition that the total flow of 30sLpm in the tubular reactor is not changed. When the DMA sample inlet is changed from 3.4 to 5.1 or 5.2, the fixed sample inlet is sealed by a plug of the placing hose.
After sample introduction, all components are rapidly mixed in a tubular reaction cavity to quickly reach turbulence, a double-layer structure of water bath temperature control is added on a structure of a nucleation area (II) of a main body of a flow tube, the double-layer structure comprises a circulating water bath inlet 6 and a water bath outlet 4, a precursor reactant enters an aerosol nucleation area to generate nuclei, the temperature of the part is lower according to the working principle of the flow tube, and the temperature is controlled between several degrees and more than ten degrees in the experimental process. The nucleation zone (II) is 110cm in length, and three pre-stage sampling ports with an outer diameter of 1/4 inches are arranged at intervals of about 27 cm. Finally, 2 sampling areas (three) with outer diameters of 1/4 and 1/2 inches are distributed in the length of about 10cm and are respectively provided with a rear-stage sampling port 8. After the sample gas is rapidly mixed and reaches turbulence, the sample gas reaches a nucleation area (II) with suddenly reduced temperature to generate molecular clusters for further nucleation, the particle number continuously rises, the particle size continuously grows, and the sample gas rapidly reaches a sampling area (III) for detection. The change of the particle number concentration with time is the most basic parameter for identifying whether nucleation occurs, a carbon tube (particle loss is reduced) is directly connected with a drawable sampling port and a sample inlet of a particle size amplifier (PSM, model A10, Airmodus ltd., Finland) combined with a condensation nucleus particle counter (CPC, model A20, Airmodus ltd., Finland) instrument, the particle concentration is directly displayed in real time by the instrument and data is stored, the change of the new particle number concentration formed by continuous nucleation reaction time is obtained, and the nucleation rate of the aerosol can be judged in combination with the reaction time.
In the experimental process, the flow of introducing the purge sulfuric acid steam is adjusted to change the concentration of sulfuric acid in the flow tube, the temperature and humidity of the nucleation area and the change of the sample introduction position so as to observe the generation condition of new particles of 1-3 nm.
FIG. 4 is a graph showing the variation of particle number concentration with the flow rate of sulfuric acid in the embodiment of the present invention. The number of 1-3nm particles formed by the sulfuric acid-dimethylamine-water ternary system under different reaction time (determined by DMA sample injection position) is changed along with the sulfuric acid flow (in proportion to the sulfuric acid concentration). Wherein the sample injection flow rate of DMA is fixed at 1.00sLpm, the sample injection positions are respectively at 3.4, 5.1 and 5.2, the total flow rate is 30sLpm, H2SO4The sample injection position is fixed at 54.5cm (approximately aligned with the sample injection port 5.2) of the nucleation area, and the sampling port can be pulled to the tail end to be fixed and then is directly connected with the carbon tube to enter a PSM + CPC instrument for sampling. The water bath temperature of the nucleation area is 2 ℃, the temperature and humidity of the sampling area are 10 ℃ and 38% RH. It can be seen that the number of particles from 1 to 3nm increases with increasing concentration of sulfuric acid; the condition of the DMA introduced at different positions can be different due to the change of nucleation time and the influence of water on the particle number and the corresponding nucleation process. The phenomena of nucleation occurrence, particle number change and different nucleation processes illustrate that the utility model can be used for the kinetic research of aerosol nucleation.
After the experiment is finished, the sample injection is stopped, the air duct is disconnected, and the flow tube can be directly disassembled and cleaned. The specific implementation mode is as follows: and (4) vibrating and cleaning the inner tube for two or three times by using hot ultrapure water, and then drying by using zero air. If residual sulfuric acid, organic matters and the like are adhered to the inner wall of the tubular reaction cavity after continuous accumulation experiments, a high-temperature hot air blowing method can be adopted to remove: after simple cleaning, the outer tube of the tubular reaction cavity is gradually heated by water bath in stages, and high-flow zero-air is introduced into the inner tube for purging.
The above embodiments are provided only for the purpose of describing the present invention, and are not intended to limit the scope of the present invention. The scope of the invention is defined by the appended claims. Various equivalent substitutions and modifications can be made without departing from the spirit and principles of the invention, and are intended to be within the scope of the invention.
Claims (9)
1. An aerosol nucleation turbulent flow tube reactor with continuously adjustable reaction time, characterized in that: the reactor comprises an inner tube with the length-diameter ratio of 50-100, a drawable sample inlet tube (1), a sample inlet sealing end cover (2), a sample outlet sealing end cover (9) and a drawable sampling tube (10); one end of the inner tube is a sample introduction end, and the other end of the inner tube is a sample discharge end; the inner tube comprises a sampling area with adjustable sampling position, a nucleation area and a sampling area with adjustable sampling position; the sample inlet end is positioned in the sample inlet area, and the sample outlet end is positioned in the sampling area; a sample inlet sealing end cover (2) is arranged at the sample inlet end of the sample inlet area, and the drawable sample inlet pipe (1) is matched with the sample inlet sealing end cover (2) for use; the sampling end of the sampling area is provided with a sampling port sealing end cover (9), and the sampling pipe (10) can be pulled to be matched with the sampling port sealing end cover (9) for use.
2. The flow tube reactor of claim 1 wherein: the inner tube is sequentially provided with a drawable sample inlet tube (1), a sample inlet sealing end cover (2), a fixed sample inlet (3.1-3.4), a primary sample inlet (5.1-5.3), a temperature and humidity detection port (7), a rear-stage sample inlet (8), a sample outlet sealing end cover (9) and a drawable sample inlet tube (10).
3. The flow tube reactor of claim 2 wherein: the fixed sample inlet (3.1-3.4) is arranged in a sample injection area with an adjustable sample injection position, the primary sample inlet (5.1-5.3) is arranged in a nucleation area, and the temperature and humidity detection port (7) and the post-stage sample inlet (8) are arranged in a sample injection area with an adjustable sample injection position; wherein, the primary sampling port (5.1-5.3) is used as a fixed sample inlet.
4. The flow tube reactor of claim 1 wherein: the reactor also comprises an outer pipe, the outer pipe is sleeved outside the nucleation area, and a water bath interlayer is formed between the outer pipe and the nucleation area; the outer pipe is sequentially provided with a water bath outlet (4) and a water bath inlet (6).
5. The flow tube reactor of claim 1 wherein: the inner tube is made of quartz glass, and the length-diameter ratio is 65.
6. The flow tube reactor of claim 4 wherein: temperature and humidity measurement mouth (7) set up in the sampling district of adjustable sampling position, temperature and humidity measurement mouth (7) department is equipped with the warm and humid acidimeter, and wherein nucleation district outer tube water bath control aerosol nucleation temperature, nucleation temperature by warm and humid acidimeter real-time supervision.
7. The flow tube reactor of claim 1 wherein: the drawable sample inlet pipe (1) and the sample inlet sealing end cover (2) are fixed by a stainless steel ball milling clamp; the drawable sampling tube (10) and the sample outlet sealing end cover (9) are fixed by a stainless steel ball milling clamp; preferably, the drawable sample tube (1) and the drawable sample tube (10) are each 70cm long and each one quarter inch in outside diameter.
8. The flow tube reactor of claim 2 wherein: the primary sampling ports comprise three primary sampling ports, and the three primary sampling ports are uniformly distributed on the nucleation area; the fixed sample inlet comprises four fixed sample inlets which are uniformly distributed on a sample inlet area with an adjustable sample inlet position.
9. The flow tube reactor of claim 1 wherein: the drawable sampling tube (1) and the drawable sampling tube (10) are both made of quartz glass; preferably, the drawable sampling tube (1) is arranged axially along the inner tube; preferably, the drawable sampling tube (10) is arranged axially along the inner tube.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120178648.3U CN215139933U (en) | 2021-01-22 | 2021-01-22 | Aerosol nucleation turbulent flow tube reactor capable of continuously adjusting reaction time |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120178648.3U CN215139933U (en) | 2021-01-22 | 2021-01-22 | Aerosol nucleation turbulent flow tube reactor capable of continuously adjusting reaction time |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215139933U true CN215139933U (en) | 2021-12-14 |
Family
ID=79407248
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120178648.3U Active CN215139933U (en) | 2021-01-22 | 2021-01-22 | Aerosol nucleation turbulent flow tube reactor capable of continuously adjusting reaction time |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215139933U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112915955A (en) * | 2021-01-22 | 2021-06-08 | 中国科学技术大学 | Aerosol nucleation turbulent flow tube reactor capable of continuously adjusting reaction time |
-
2021
- 2021-01-22 CN CN202120178648.3U patent/CN215139933U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112915955A (en) * | 2021-01-22 | 2021-06-08 | 中国科学技术大学 | Aerosol nucleation turbulent flow tube reactor capable of continuously adjusting reaction time |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN215139933U (en) | Aerosol nucleation turbulent flow tube reactor capable of continuously adjusting reaction time | |
| CN109060463B (en) | Opposite flame soot collecting device and method and soot volume fraction measuring method | |
| CN107374585B (en) | Haze environment simulation device for experimental animals | |
| CN201819828U (en) | Nitrogen blowing concentrator | |
| CN206177876U (en) | Real -time on -line measuring pyrolysis product's sampling device | |
| CN107917824A (en) | A kind of low pressure in minienvironment cabin adjusts the method for sampling and device | |
| CN107064117A (en) | Nitrogen oxides and peroxyacetyl nitrate joint on-line measuring device and method | |
| CN108872033A (en) | The heterogeneous reaction activity measurement device and method of gaseous pollutant in atmospheric environment | |
| CN206038385U (en) | Stationary source volatile organic compounds sampling probe | |
| CN104713938B (en) | The on-line analysis system and method for a kind of continuous monitoring catalysis reduction nitrobenzene reaction | |
| CN108435269B (en) | Multi-sheath atmospheric chemical laminar flow reaction system | |
| CN103913548B (en) | A kind of experimental provision and experimental technique studying SNCR performance in New Type Dry-process Cement Production dore furnace | |
| CN112915955A (en) | Aerosol nucleation turbulent flow tube reactor capable of continuously adjusting reaction time | |
| CN106501135A (en) | A kind of aerosol is into nuclear reactor | |
| CN203164044U (en) | Portable sample concentrator | |
| CN104374631B (en) | Nitrogen blowing instrument | |
| CN106000484B (en) | A kind of photochemistry emulation smog box | |
| CN206492388U (en) | Suitable for the sterilizing system of articles for children | |
| CN206362772U (en) | Material for air purification purifying property determines device | |
| CN205241251U (en) | Ludox closed loop reation kettle | |
| CN105731415B (en) | A kind of overlength carbon nano pipe preparation facilities and preparation method thereof | |
| CN201819830U (en) | Nitrogen supply device for nitrogen blowing meter | |
| CN209428415U (en) | A kind of automatic cycle water-bath type laboratory reactor fertilizer gassy fermentation device | |
| CN208427075U (en) | More sheath Atmospheric Chemistry laminar flow reaction systems | |
| CN107271236A (en) | System and its purposes in hud typed aerosol is prepared occur for a kind of hud typed aerosol |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |