Device and method for detecting asphalt solid particles and volatile matters thereof

Abstract

The invention relates to the technical field of testing devices, and discloses an asphalt solid particulate matter and volatile matter detection device and method, and the device comprises a flue gas generation unit and a particulate matter and volatile organic compound collection unit; the tail end of the flue gas generating unit is connected with the head end of the particulate matter and volatile organic compound collecting unit through a connecting pipe, and the flue gas generating unit is used for generating and transmitting particulate matters and volatile organic compounds in the asphalt flue gas to the particulate matter and volatile organic compound collecting unit. According to the device and the method for detecting the asphalt solid particles and the volatile matters thereof, the solid particles can be effectively collected, the solid particles with different particle sizes can be collected, the concentration of the volatile organic compounds can be detected in real time, and the types and the contents of the volatile organic compounds can be analyzed.

Description

Technical Field

[0001] The invention relates to the technical field of testing devices, and in particular to a device and method for detecting asphalt solid particles and volatiles thereof. Background Art

[0002] In the field of transportation construction, asphalt materials are widely used in road paving due to their good adhesion and waterproof properties. However, during the mixing, transportation and paving of asphalt materials, a large amount of solid particles and harmful gases will inevitably be released. These substances are collectively referred to as asphalt fumes. These fumes have complex components and contain a variety of harmful substances. They will not only cause irreversible pollution to the surrounding natural environment, such as affecting air quality, soil and vegetation growth, but also pose a serious threat to people's health, such as increasing the risk of respiratory diseases. Therefore, the pollution problem of asphalt fume needs to be solved urgently to promote the sustainable development of the transportation construction industry.

[0003] In order to reduce the negative impact of asphalt fume on the environment and human body and achieve the rapid development of green transportation, academia and industry have begun to pay attention to the research on the collection and treatment technology of asphalt fume. However, the current asphalt fume collection methods still have some limitations. For example, the existing collection technology often focuses on the physical collection of fume, but pays less attention to the subsequent detection process, which may lead to the risk of sample contamination or data distortion during the detection process. Summary of the invention

[0004] In view of the deficiencies in the prior art, the present invention proposes a device and method for detecting asphalt solid particles and their volatiles, which are used to solve the above-mentioned technical problems.

[0005] In the first aspect, a detection device for asphalt solid particles is provided, comprising: a smoke generating unit and a particle and volatile organic compound collection unit; the end of the smoke generating unit is connected to the head end of the particle and volatile organic compound collection unit via a connecting pipe, and is used to generate and transmit the particle and volatile organic compound in the asphalt smoke to the particle and volatile organic compound collection unit.

[0006] Furthermore, the smoke generating unit comprises a drying tube 1, a drying tube 2, a constant temperature oil bath, a stirrer and a three-necked flask; the drying tube 1 and the drying tube 2 are respectively provided with a desiccant 1 and a desiccant 2;

[0007] The drying tube 1 is connected to the drying tube 2 through a silicone tube, one end of the three-necked flask is connected to a glass tube, and the glass tube is connected to the drying tube 2 through a silicone tube. The three-necked flask is installed on the constant temperature oil bath pot, and the stirrer is installed on the three-necked flask, and the stirring rod of the stirrer is located in the three-necked flask, and asphalt is provided in the three-necked flask.

[0008] Furthermore, the particle collection unit includes a second iron frame platform, a third iron frame platform, a filter membrane tube and an air pump;

[0009] The filter membrane tubes are respectively equipped with filter membrane one, filter membrane two and filter membrane three, and the filter membrane tubes are installed on iron frame platform two and iron frame platform three;

[0010] The other end of the three-necked flask is also connected to a glass tube, the glass tube is connected to the filter membrane tube through a silicone tube, and the filter membrane tube is connected to the vacuum pump through a silicone tube.

[0011] Furthermore, the second and third iron frame platforms are both installed with a height adjustment component, and the height adjustment component includes a driving motor, a first gear, a second gear, and a rotating rod. The second and third iron frame platforms are both installed with a first mounting plate and a second mounting plate. The driving motor is installed on the first mounting plate, and the output shaft of the driving motor is connected to the first gear, the first gear is meshed with the second gear, the second gear is connected to the rotating rod, one end of the rotating rod is connected to the second mounting plate, and the other end is connected to the iron frame platform. A sliding bar is threadedly connected to the rotating rod, and a fixing rod is also arranged between the second mounting plate and the iron frame platform, the fixing rod passes through the sliding bar, and the end of the sliding bar away from the rotating rod is connected to the filter membrane tube.

[0012] In a second aspect, a volatile matter detection device is provided, comprising: a volatile organic matter collection unit;

[0013] The end of the smoke generating unit is connected to the head end of the volatile matter collecting unit through a connecting pipe, and is used to generate and transmit volatile organic matter in the asphalt smoke to the volatile organic matter detecting unit.

[0014] Furthermore, the volatile organic compound detection unit includes a volatile organic compound detector, and the volatile organic compound detector is respectively provided with a detector air inlet and a detector air outlet, and the detector air inlet is connected to the three-necked flask through a silicone tube.

[0015] In a third aspect, other components and content collection devices are provided;

[0016] The other component and content collection device includes a gas delivery unit and a gas collection unit;

[0017] The air supply unit is connected to the head end of the smoke generating unit through a connecting pipe, and the head end of the gas collecting unit is connected to the tail end of the smoke generating unit through a connecting pipe, so as to collect other components in the asphalt smoke.

[0018] Furthermore, the air supply unit includes an inflator, and the inflator is connected to the smoke generating unit through a silicone tube.

[0019] Furthermore, the gas collection unit comprises a gas sampling bag of aluminum foil, the gas sampling bag is provided with a gas bag air inlet, and the gas bag air inlet is connected to the three-necked flask through a silicone tube.

[0020] In a fourth aspect, a method for detecting asphalt solid particles is provided, based on the asphalt solid particle detection device described in any one of the above, comprising the following steps:

[0021] Pour the asphalt into a three-necked flask and place it in a constant temperature oil bath;

[0022] Insert a stirring rod into the three-necked flask and control the speed of the stirring rod;

[0023] Stable dry air is continuously introduced into the three-necked flask. After passing through drying tube 1 and drying tube 2, the air enters the interior of the three-necked flask to fully react with the asphalt, and carries the flue gas into the particulate matter collection unit from the other outlet of the three-necked flask;

[0024] Solid particles are collected by the filter membrane in the particle collection unit, and the quality difference of the filter membrane before and after the test is compared to quantitatively characterize the solid particle content in the asphalt fume.

[0025] In a fifth aspect, a method for detecting volatiles is provided, based on the volatiles detection device described in any one of the above, comprising the following steps:

[0026] Pour the asphalt into a three-necked flask and place it in a constant temperature oil bath;

[0027] Insert a stirring rod into the three-necked flask and control the speed of the stirring rod;

[0028] Stable dry air is continuously introduced into the three-necked flask. After passing through drying tube 1 and drying tube 2, the air enters the interior of the three-necked flask to fully react with the asphalt, and carries the flue gas into the volatile organic compound collection unit from the other outlet of the three-necked flask;

[0029] The volatile organic compound detector in the volatile organic compound collection unit is used to detect the volatile compound concentration in real time, and the type and content of the volatile organic compounds are analyzed using the integration tool.

[0030] In a sixth aspect, a method for detecting other components and contents is provided, based on the other components and contents collection device described in any one of the above, comprising the following steps:

[0031] Pour the asphalt into a three-necked flask and place it in a constant temperature oil bath;

[0032] Insert a stirring rod into the three-necked flask and control the speed of the stirring rod;

[0033] Stable dry air is continuously introduced into the three-necked flask. After passing through drying tube 1 and drying tube 2, the air enters the interior of the three-necked flask to fully react with the asphalt, and carries the flue gas into the gas collection unit from the other outlet of the three-necked flask;

[0034] The asphalt fume is collected by the aluminum foil gas sampling bag in the gas collection unit for the subsequent GC-MS test to qualitatively and quantitatively analyze the asphalt fume components.

[0035] The invention adopting the above technical solution has the following advantages:

[0036] 1. The present invention proposes a device and method for detecting asphalt solid particles and volatiles thereof, which can not only effectively collect solid particles, but also collect solid particles of different particle sizes.

[0037] 2. The present invention can not only analyze the VOCs gas concentration in real time, but also can be combined with an integration tool to quantitatively analyze the total amount of VOCs gas.

[0038] 3. The present invention can obtain asphalt fume conveniently and efficiently, providing technical support for subsequent asphalt production and scientific research.

[0039] 4. The present invention detects and analyzes asphalt fume under conditions of oxygen and air flow, which is closer to the asphalt fume release characteristics in actual engineering. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the specific implementation of the present invention, the following will briefly introduce the drawings required for use in the specific implementation. In all the drawings, each element or part is not necessarily drawn according to the actual scale.

[0041] Figure 1 It is a schematic diagram of the structure of the asphalt solid particles and volatile matter detection device of the present invention;

[0042] Figure 2 A graph showing the relationship between the concentration of volatile organic compounds and time in the volatile organic compound testing method of the present invention;

[0043] Figure 3 It is a schematic structural diagram of the height adjustment component in the smoke generating unit of the present invention. Description of the drawings:

[0045] Air supply unit 1, inflator 1-1,

[0046] Smoke generation unit 2, drying tube 1 2-1, desiccant 1 2-2, clamp 2-3, silicone tube 2-4, drying tube 2 2-5, desiccant 2 2-6, air flow meter 2-7, air valve 1 2-8, glass tube 2-9, rubber stopper 1 2-10, PTFE stopper 2-11, rubber stopper 2 2-12, air valve 2 2-13, stirrer 2-14, chuck 2-15, three-necked flask 2-16, asphalt 2-17, constant temperature oil bath pot 2-18, iron stand 1 2-19, dimethyl silicone oil 2-20, stirring rod 2-21

[0047] Particle collection unit 3, iron frame one 3-1, iron frame two 3-2, filter membrane tube 3-3, filter membrane one 3-4, filter membrane two 3-5, filter membrane three 3-6, vacuum pump 3-7,

[0048] Volatile organic compound detection unit 4, volatile organic compound detector 4-1, detector air inlet 4-2, detector air outlet 4-3, detector display screen 4-4,

[0049] Gas collection unit 5, aluminum foil gas sampling bag 5-1, gas bag air inlet 5-2,

[0050] Driving motor 6-1, first gear 6-2, second gear 6-3, rotating rod 6-4, first mounting plate 6-5, second mounting plate 6-6, sliding bar 6-7, fixing rod 6-8. DETAILED DESCRIPTION

[0051] The following embodiments of the technical solution of the present invention are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and are therefore only used as examples, and cannot be used to limit the protection scope of the present invention.

[0052] like Figure 1 to Figure 3 As shown, the asphalt solid particle detection device of the present invention comprises: an air supply unit 1, a smoke generation unit 2, a particle collection unit 3, a volatile organic matter detection unit 4 and a gas collection unit 5;

[0053] In some embodiments, the end of the smoke generating unit 2 is connected to the head end of the particle collecting unit 3 through a connecting tube (including a glass tube 2-9 and a silicone tube 2-4) for generating and transmitting solid particles in the asphalt smoke to the particle collecting unit 3.

[0054] In some embodiments, the end of the smoke generating unit 2 is connected to the head end of the volatile organic compound detection unit 4 through a connecting tube (including a glass tube 2-9 and a silicone tube 2-4) for generating and transmitting volatile organic compounds in asphalt smoke to the volatile organic compound detection unit 4.

[0055] In some embodiments, a certain section of the air supply unit 1 is connected to the head end of the smoke generating unit 2 through a connecting tube (including a glass tube 2-9 and a silicone tube 2-4), and the tail end of the smoke generating unit 2 is connected to the head end of the gas collecting unit 5 through a connecting tube (including a glass tube 2-9 and a silicone tube 2-4). It is used to transmit oxygen to promote the thermal oxygen reaction of asphalt, and also allows the generated asphalt smoke to enter the gas collecting unit 5 effectively and quickly.

[0056] In some embodiments, the smoke generating unit 2 includes a drying tube 1 2-1, a drying tube 2-5, a constant temperature oil bath 2-18, a stirrer 2-14 and a three-necked flask 2-16; the drying tube 1 2-1 and the drying tube 2 2-5 are respectively provided with a desiccant 1 2-2 and a desiccant 2 2-6;

[0057] The drying tube 1 2-1 is connected to the drying tube 2-5 through the silicone tube 2-4, the left end of the three-necked flask 2-16 is connected to the glass tube 2-9, and the glass tube 2-9 is connected to the drying tube 2-5 through the silicone tube 2-4. The three-necked flask 2-16 is installed on a constant temperature oil bath 2-18. The three-necked flask 2-16 has three ports. The stirrer 2-14 is installed on the middle port of the three-necked flask 2-16. The middle port of the three-necked flask 2-16 is provided with a polytetrafluoroethylene (PTFE) plug 2-11, and the stirring rod 2-21 of the stirrer 2-14 is located in the three-necked flask 2-16. A chuck 2-15 is provided between the stirring rod 2-21 and the stirrer 2-14. Asphalt 2-17 is provided in the three-necked flask 2-16, and dimethyl silicone oil 2-20 is provided in the constant temperature oil bath 2-18.

[0058] The smoke generating unit 2 also includes an iron frame 2-19, and an air flow meter 2-7 and an air valve 2-8 are installed on the silicone tube 2-4 between the glass tube 2-9 and the drying tube 2-5.

[0059] Specifically, the inlet of the drying tube 1 2-1 in the smoke generating unit 2 is in contact with the air, and the outlet is connected to the inlet of the drying tube 2-5 through a silicone tube 2-4 and a clamp 2-3. A desiccant 1 2-2 and a desiccant 2 2-6 are built in. The desiccants can be of the same type or different types. The outlet of the drying tube 2-5 is connected to the inlet of the air flow meter 2-7 through a silicone tube 2-4 and a clamp 2-3. The outlet of the air flow meter 2-7 is connected to the left mouth of the three-necked flask 2-16 through a silicone tube 2-4, a glass tube 2-9 and a clamp 2-3. The right mouth of the three-necked flask 2-16 is connected to the filter membrane tube 3-3 at the head end of the collecting unit.

[0060] After the gas in the flue gas generating unit 2 passes through the drying tube 1 2-1 and the drying tube 2 2-5, it enters the interior of the three-necked flask 2-16 filled with high-temperature molten asphalt through the silicone tube 2-4 and the glass tube 2-9 connected to the left mouth of the three-necked flask 2-16. After the asphalt is fully reacted, the flue gas is carried by the silicone tube 2-4 and the glass tube 2-9 connected to the right mouth of the three-necked flask 2-16 and enters the particle collection unit 3; the three-necked flask 2-16 is placed in a constant temperature oil bath 2-18 of corresponding temperature, and rubber PTFE plugs 2-11 are set at the left and right mouths, and a PTFE plug 2-11 is set at the middle mouth; one end of the stirring rod 2-21 passes through the PTFE plug 2-11 and is fixed to the agitator 2-14 by the chuck 2-15, and the other end of the stirring rod 2-21 is provided with a stirring blade, which is located in the asphalt 2-17.

[0061] In some embodiments, the particle collection unit 3 includes a second iron frame 3-1, a third iron frame 3-2, a filter membrane tube 3-3, and an air pump 3-7;

[0062] In order to prevent the problem of low solid particle collection efficiency caused by too large a distance between the collection filters, the present invention sets a glass filter tube 3-3, which is equipped with filter one 3-4, filter two 3-5 and filter three 3-6, and the filter tube 3-3 is installed between the iron frame platform 2 3-1 and the iron frame platform 3-2. The filter one 3-4, filter two 3-5 and filter three 3-6 can be set as PTFE filter membrane, glass fiber filter membrane, polypropylene (PP) filter membrane and other filter membranes with high adsorption capacity. According to the solid particle collection efficiency, it is recommended to use PTFE filter membrane.

[0063] The right end of the three-necked flask 2-16 is also connected to a glass tube 2-9, on which a rubber stopper 2-12 is installed. The glass tube 2-9 is connected to the filter membrane tube 3-3 through a silicone tube 2-4, and an air valve 2-13 is installed between the glass tube 2-9 and the silicone tube 2-4. The filter membrane tube 3-3 is connected to the vacuum pump 3-7 through the silicone tube 2-4.

[0064] Specifically, the particle collection unit 3 allows dry air to carry asphalt smoke into the filter membrane tube 3-3, and has built-in filter membranes 1 3-4, 2 3-5, and 3-6 with a diameter of 47 mm, which collect large-size, medium-size, and small-size particles, respectively. The pore sizes of the filter membranes 1 3-4, 2 3-5, and 3-6 can be set according to actual needs. For example, the filter membranes 1 3-4, 2 3-5, and 3 3-6 are set according to the pore size combinations of (3μm, 2μm, 1μm), (1μm, 0.45μm, 0.22μm), and (0.45μm, 0.22μm, (1μm, 0.45μm, 0.1μm), etc.

[0065] After passing through the filter membrane, the gas is extracted by the vacuum pump 3-7, and the vacuum pump 3-7 provides stable gas for the entire device; the filter membrane tube 3-3 is fixed by the iron frame 2 3-1 and the iron frame 3 3-2.

[0066] The PTFE filter membrane has a front and back side, the front side is smooth and hydrophobic, and the back side is rough and hydrophobic. It can not only have a good adsorption and collection effect on solid particles, but also prevent errors caused by water condensation; by setting filter membranes with different pore sizes, different solid particles can be collected according to their particle sizes; filter membranes 1 3-4, 2 3-5 and 3-6 with different pore sizes are first weighed on an analytical balance with an accuracy of 0.0001g, and then are placed in the filter membrane tube 3-3 with the hydrophobic surface facing the gas flow direction and the hydrophilic surface in the same direction as the gas flow direction to collect solid particles in the asphalt flue gas.

[0067] The collection process lasts for a corresponding time, which is the amount of solid particles released in the asphalt fume at the corresponding time. The vacuum pump 3-7 provides a stable airflow rate for the device, extracts the internal smoke out of the three-necked flask 2-16, and collects solid particles through 3-4, filter membrane 2 3-5 and filter membrane 3 3-6. At the same time, due to negative pressure, fresh air from the outside enters the three-necked flask 2-16 through the drying tube 1 2-1, desiccant 1 2-2, drying tube 2 2-5 and desiccant 2 2-6 to continue to participate in the asphalt thermal oxidation reaction, and then is extracted from the three-necked flask 2-16 through the vacuum pump 3-7.

[0068] In some embodiments, a height adjustment component is installed on both the iron frame platform 2 3-1 and the iron frame platform 3 3-2, and the height adjustment component includes a drive motor 6-1, a first gear 6-2, a second gear 6-3, and a rotating rod 6-4. A first mounting plate 6-5 and a second mounting plate 6-6 are installed on both the iron frame platform 2 3-1 and the iron frame platform 3-2. The drive motor 6-1 is installed on the first mounting plate 6-5, and the output shaft of the drive motor 6-1 is connected to the first gear 6-2, the first gear 6-2 is meshed with the second gear 6-3, the second gear 6-3 is connected to the rotating rod 6-4, the top end of the rotating rod 6-4 is connected to the second mounting plate 6-6, and the bottom end is connected to the iron frame platform. A sliding bar 6-7 is threadedly connected to the rotating rod 6-4, and a fixed rod 6-8 is also arranged between the second mounting plate 6-6 and the iron frame platform. The fixed rod 6-8 passes through the sliding bar 6-7, and the end of the sliding bar 6-7 away from the rotating rod 6-4 is connected to the filter membrane tube 3-3.

[0069] Specifically, the drive motor 6-1 is started, and the drive motor 6-1 drives the first gear 6-2 and the second gear 6-3 to rotate, thereby causing the rotating rod 6-4 to rotate, and then driving the slide bar 6-7 to move up and down on the rotating rod 6-4. Due to the restriction of the fixed rod 6-8 on the slide bar 6-7, the slide bar 6-7 can only move up and down, and finally the use height of the filter membrane tube 3-3 can be adjusted to ensure that its height is consistent with the height of the glass tube 2-9 at the right mouth of the three-necked flask 2-16.

[0070] In some other embodiments, a method for detecting asphalt solid particles is provided, based on any one of the above-mentioned devices for detecting asphalt solid particles, comprising the following steps:

[0071] Step S01, pour 300 g of high-temperature molten asphalt 2-17 into a 500 mL three-necked flask 2-16, and then place it in an oil bath at a corresponding temperature;

[0072] Step S02, inserting a PTFE plug 2-11 and a stirring rod into the middle opening of a 500 mL three-necked flask 2-16;

[0073] Step S03, continuously introducing stable dry air into the left opening, i.e., the air inlet, of the 500mL three-necked flask 2-16; at the right opening, i.e., the air outlet, of the 500mL three-necked flask 2-16, the air flow passes through the filter membrane tube 3-3 equipped with filter membranes of different pore sizes;

[0074] Step S04, weigh the filter membranes with different pore sizes before and after the test, compare the mass difference before and after the test, quantitatively characterize the solid particle content in the asphalt flue gas, and calculate the solid particle generation amount according to formula (1).

[0075] M=(M a -M a1 )+(M b -M b1 )+(M c -M c1 ) (1)

[0076] Where, M represents the mass of solid particles in asphalt flue gas, unit: g;

[0077] M a It indicates the mass of filter membrane 3-4 after the test, unit: g;

[0078] M a1 It indicates the mass of filter membrane 3-4 before the test, unit: g;

[0079] M b It indicates the mass of filter membrane 23-5 after the test, unit: g;

[0080] M b1It indicates the mass of filter membrane 23-5 before the test, unit: g.

[0081] M c It indicates the mass of filter membrane 3-6 after the test, unit: g;

[0082] M c1 It indicates the mass of filter membrane 3-6 before the test, unit: g;

[0083] In some embodiments, in step S01, the heating temperature is 140-200°C.

[0084] In some embodiments, in step S01, since the melting temperature of asphalt is different from the test temperature, the three-necked flask 2-16 is first placed in an oil bath for 5 to 10 minutes, and the asphalt temperature is detected with a thermometer. The required test can be performed only after the asphalt temperature rises to the test temperature.

[0085] In some embodiments, in step S02, the rotation speed of the stirring rod is controlled to be 200-300 rpm, and the stirring rod is prevented from rotating simultaneously with the PTFE plug 2-11 to cause leakage of asphalt fume.

[0086] In some embodiments, in step S03, the air is dried.

[0087] In some embodiments, in step S03, the air flow rate is 1-2 L / min.

[0088] In some embodiments, in step S03 , the air includes 21% oxygen, 78% nitrogen, and 1% other impurity gases.

[0089] In some embodiments, in step S03, the filter membrane is hydrophobic and smooth on the front side and hydrophilic and fibrous on the back side.

[0090] In some embodiments, in step S04, the filter membranes before and after the test are placed on an analytical balance (with an accuracy of 0.0001 g), weighed more than 5 times and an average value is taken to obtain the content of solid particles on the filter membrane.

[0091] In some embodiments, along the gas flow direction, a vacuum pump 3-7 is connected behind the filter membrane tube 3-3 to use its power to control the flow rate of the gas.

[0092] In some embodiments, the collection time of the device is generally preferably controlled within 1 hour.

[0093] In other embodiments, a volatile matter detection device is provided;

[0094] The volatile matter detection device comprises a volatile organic matter detection unit 4;

[0095] The end of the smoke generating unit 2 can be connected to the head end of the volatile organic compound detection unit 4 through a connecting tube (including a glass tube 2-9 and a silicone tube 2-4) to generate and transmit the volatile organic compound gas in the asphalt smoke to the volatile compound detection unit 4.

[0096] In some embodiments, the volatile organic compound detection unit 4 includes a volatile organic compound detector (portable volatile organic compound detector), which is respectively provided with a detector air inlet 4-2 and a detector air outlet 4-3, and the detector air inlet 4-2 is connected to the three-necked flask 2-16 through a silicone tube 2-4.

[0097] Specifically, the volatile organic compound detection unit 4 allows the VOCs gas generated by the smoke generation unit 2 to enter the detector from the air inlet 4-2, and uses the ultraviolet light inside the volatile organic compound detector to ionize the VOCs gas into positive ions and negative ions. The VOCs content is evaluated by detecting the charge of the ionized gas, and the concentration value is displayed on the display screen of the concentration volatile organic compound detector in units of ppm. At the same time, the relationship between the VOCs gas concentration and time curve is obtained, and corresponding data processing software, such as Figure 2 As shown, the area below the concentration curve and enclosed by the x-axis (x=0) is integrated to characterize the VOCs release amount. Finally, the detected gas is released into the atmosphere through the detector outlet 4-3.

[0098] In some other embodiments, a method for detecting volatiles is provided, based on any of the volatile detection devices described above, comprising the following steps:

[0099] After the asphalt is heated to the corresponding temperature, close the air inlet valve 2-8 and the air outlet valve 2-13 of the three-necked flask 2-16, keep it for 5 minutes, and then open the air inlet valve 2-8 and the air outlet valve 2-13 after 5 minutes to detect the VOCs gas concentration of the asphalt flue gas, and obtain the relationship between the VOCs concentration and time S(x), such as Figure 2 shown.

[0100] In some embodiments, the VOCs gas is quantitatively analyzed. Figure 2 The area below the curve and enclosed by the x-axis (x=0) is integrated using formula (2) to characterize the VOCs release.

[0101]

[0102] In the formula, A represents the total amount of VOCs, unit: ppm·min;

[0103] S(x) represents the relationship between VOCs concentration and time;

[0104] t 1 Indicates the start time, unit: min;

[0105] t 2 Indicates the end time, unit: min.

[0106] The other steps are the same as the detection method of asphalt solid particles.

[0107] In other embodiments, other components and content collection devices are provided;

[0108] The device for collecting other components and contents includes an air supply unit 1 and a gas collection unit 5; the air supply unit 1 is connected to the front end of the smoke generating unit 2 through a connecting tube (including a glass tube 2-9 and a silicone tube 2-4), and the front end of the gas collection unit 5 is connected to the rear end of the smoke generating unit 2 through a connecting tube (including a glass tube 2-9 and a silicone tube 2-4), so as to collect other components in the asphalt smoke.

[0109] In some embodiments, the air supply unit 1 includes an inflator 1 - 1 , and the inflator 1 - 1 is connected to the smoke generating unit 2 via a silicone tube 2 - 4 .

[0110] Specifically, the function of the inflator 1-1 is similar to that of the vacuum pump 3-7, which delivers a constant airflow into the closed container to promote the thermal oxidation reaction of asphalt to produce smoke.

[0111] In some embodiments, the gas collection unit 5 includes an aluminum foil gas sampling bag, on which a gas bag air inlet 5-2 is provided, and the gas bag air inlet 5-2 is connected to the three-necked flask 2-16 via a silicone tube 2-4.

[0112] Specifically, the air in the gas collection unit 5 carries the asphalt fume and enters the aluminum foil gas sampling bag 5-1 through the air bag air inlet 5-2, and then other components and contents in the fume are analyzed by GC-MS test.

[0113] In other embodiments, a method for detecting other components and contents is provided, based on any of the other components and contents collection devices described above, comprising the following steps:

[0114] After the asphalt is heated to the corresponding temperature, the aluminum foil gas sampling bag 5-1 is connected to the end of the smoke generating unit 2, and the air flow rate is controlled to 50-100 mL / min and maintained for 2 minutes.

[0115] The other steps are the same as the detection method of asphalt solid particles and the detection method of volatiles.

[0116] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention, and they should all be included in the scope of the claims and specification of the present invention.

Claims

1. A device for detecting asphalt solid particles, characterized in that: include: A smoke generating unit and a particulate matter and volatile organic compound collecting unit; the end of the smoke generating unit is connected to the head end of the particulate matter and volatile organic compound collecting unit through a connecting pipe, and is used to generate and transmit the particulate matter and volatile organic compound in the asphalt smoke to the particulate matter and volatile organic compound collecting unit.

2. The asphalt solid particle detection device according to claim 1, characterized in that: The smoke generating unit comprises a drying tube 1, a drying tube 2, a constant temperature oil bath, a stirrer and a three-necked flask; the drying tube 1 and the drying tube 2 are respectively provided with a desiccant 1 and a desiccant 2; The drying tube 1 is connected to the drying tube 2 through a silicone tube, one end of the three-necked flask is connected to a glass tube, and the glass tube is connected to the drying tube 2 through a silicone tube. The three-necked flask is installed on the constant temperature oil bath pot, and the stirrer is installed on the three-necked flask, and the stirring rod of the stirrer is located in the three-necked flask, and asphalt is provided in the three-necked flask.

3. The asphalt solid particle detection device according to claim 2, characterized in that: The particle collection unit comprises a second iron frame platform, a third iron frame platform, a filter membrane tube and an air pump; The filter membrane tubes are respectively equipped with filter membrane one, filter membrane two and filter membrane three, and the filter membrane tubes are installed on iron frame platform two and iron frame platform three; The other end of the three-necked flask is also connected to a glass tube, the glass tube is connected to the filter membrane tube through a silicone tube, and the filter membrane tube is connected to the vacuum pump through a silicone tube.

4. The asphalt solid particle detection device according to claim 3, characterized in that: The second and third iron frame platforms are both installed with a height adjustment component, and the height adjustment component includes a driving motor, a first gear, a second gear, and a rotating rod. The second and third iron frame platforms are both installed with a first mounting plate and a second mounting plate. The driving motor is installed on the first mounting plate, and the output shaft of the driving motor is connected to the first gear, the first gear is meshed with the second gear, the second gear is connected to the rotating rod, one end of the rotating rod is connected to the second mounting plate, and the other end is connected to the iron frame platform. A sliding bar is threadedly connected to the rotating rod, and a fixing rod is also arranged between the second mounting plate and the iron frame platform, the fixing rod passes through the sliding bar, and the end of the sliding bar away from the rotating rod is connected to the filter membrane tube.

5. A volatile matter detection device, characterized in that: include: Volatile organic compound collection unit; The end of the smoke generating unit is connected to the head end of the volatile matter collecting unit through a connecting pipe, and is used to generate and transmit volatile organic matter in the asphalt smoke to the volatile organic matter detecting unit.

6. The volatile matter detection device according to claim 5, characterized in that: The volatile organic compound detection unit comprises a volatile organic compound detector, and the volatile organic compound detector is respectively provided with a detector air inlet and a detector air outlet, and the detector air inlet is connected to the three-necked flask through a silicone tube.

7. Other components and content collection device, characterized in that: The other component and content collection device includes a gas delivery unit and a gas collection unit; The air supply unit is connected to the head end of the smoke generating unit through a connecting pipe, and the head end of the gas collecting unit is connected to the tail end of the smoke generating unit through a connecting pipe, so as to collect other components in the asphalt smoke.

8. The other component and content collection device according to claim 7, characterized in that: The air supply unit includes an inflator, and the inflator is connected to the smoke generating unit through a silicone tube.

9. The other component and content collection device according to claim 7, characterized in that: The gas collection unit comprises a gas sampling bag of aluminum foil, the gas sampling bag is provided with a gas bag air inlet, and the gas bag air inlet is connected to the three-necked flask through a silicone tube.

10. A method for detecting solid particles in asphalt, characterized in that: The asphalt solid particle detection device according to any one of claims 1 to 4 comprises the following steps: Pour the asphalt into a three-necked flask and place it in a constant temperature oil bath; Insert a stirring rod into the three-necked flask and control the speed of the stirring rod; Stable dry air is continuously introduced into the three-necked flask. After passing through drying tube 1 and drying tube 2, the air enters the interior of the three-necked flask to fully react with the asphalt, and carries the flue gas into the particulate matter collection unit from the other outlet of the three-necked flask; Solid particles are collected by the filter membrane in the particle collection unit, and the quality difference of the filter membrane before and after the test is compared to quantitatively characterize the solid particle content in the asphalt fume.

11. A method for detecting volatile substances, characterized in that: The volatile matter detection device according to any one of claims 5 to 6 comprises the following steps: Pour the asphalt into a three-necked flask and place it in a constant temperature oil bath; Insert a stirring rod into the three-necked flask and control the speed of the stirring rod; Stable dry air is continuously introduced into the three-necked flask. After passing through drying tube 1 and drying tube 2, the air enters the interior of the three-necked flask to fully react with the asphalt, and carries the flue gas into the volatile organic compound collection unit from the other outlet of the three-necked flask; The volatile organic compound detector in the volatile organic compound collection unit is used to detect the volatile compound concentration in real time, and the type and content of the volatile organic compounds are analyzed using the integration tool.

12. The method for detecting other components and contents is characterized in that: The other component and content collection device according to any one of claims 7 to 9 comprises the following steps: Pour the asphalt into a three-necked flask and place it in a constant temperature oil bath; Insert a stirring rod into the three-necked flask and control the speed of the stirring rod; Stable dry air is continuously introduced into the three-necked flask. After passing through drying tube 1 and drying tube 2, the air enters the interior of the three-necked flask to fully react with the asphalt, and carries the flue gas into the gas collection unit from the other outlet of the three-necked flask; The asphalt fume is collected by the aluminum foil gas sampling bag in the gas collection unit for the subsequent GC-MS test to qualitatively and quantitatively analyze the asphalt fume components.

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