Indoor Simulation and Behavior Quantification Method Based on the Actual Smoke Emission during Road Construction Period

Abstract

The present invention discloses an indoor simulation and behavior quantification method based on the actual situation of flue gas emissions during the road construction period. The method comprises the following steps: First, design an indoor simulation device for flue gas emissions; Second, determine the evaluation indexes and degree standards for the field-indoor environment matching degree; Third, determine the indoor simulation conditions based on the actual situation of flue gas emissions during the road construction period and the simulation device; Fourth, conduct a flue gas emission simulation test and quantify the multi-dimensional flue gas emission behavior of asphalt and mixtures. In the present invention, the indoor simulation method based on the actual situation of flue gas emissions during the road construction period is used to conduct a quantification test on the multi-dimensional flue gas emission behavior of asphalt and mixtures, and different indexes such as instantaneous concentration, emission rate, and total emission amount are proposed. It not only measures the instantaneous concentration of asphalt fume emissions at the moment of different stages from production to paving, but also quantifies the total amount of flue gas emissions of asphalt throughout the whole life cycle of road construction, providing a reliable basis for obtaining the flue gas data of the whole life cycle of asphalt pavement construction.

Description

Technical Field

[0001] The invention relates to an indoor simulation and behavior quantification method for asphalt fume emission, and in particular to an indoor simulation and behavior quantification method for fume emission based on the actual on-site fume emission during asphalt pavement construction. Background Art

[0002] During the processing and use of asphalt, its components migrate into the environment in the form of flue gas, becoming a source of environmental organic pollution. A large amount of polluting flue gas will be released during the pavement construction process, such as the asphalt hot storage stage, the asphalt mixture mixing stage, and the pavement paving and rolling stage. Asphalt flue gas contains thousands of substances, which not only cause environmental pollution, but also the main components such as acridines, phenols, pyridines, anthracene naphthalenes and benzopyrene substances have different degrees of harm to the human body. Existing studies have shown that the environmental burden and health hazards caused by high-performance new pavement materials such as rubber modified asphalt and SBS modified asphalt during processing and use are far greater than those of the base asphalt materials. Therefore, while improving the performance of pavement, environmental protection issues during pavement construction are also worthy of attention. Accurately quantifying the on-site emission of flue gas during asphalt pavement construction has become an issue of increasing concern in the field of urban environment and human health.

[0003] However, at present, the quantification of asphalt fume is mainly concentrated in the laboratory, which is far from the current status of fume emissions at construction sites. Specifically, the existing research has the following drawbacks:

[0004] (1) The indoor research on asphalt smoke is crude, the test equipment is simple, and the types of equipment used by different researchers are varied and not standardized; no indoor simulation method related to the actual on-site smoke emission is proposed;

[0005] (2) Due to climate factors, it is difficult to directly quantify the smoke on site, and the existing indoor quantification of asphalt smoke emissions is out of touch with the site, resulting in the problem of "difficult to quantify on site and distorted comparison indoors";

[0006] (3) Existing quantitative research on asphalt flue gas mainly focuses on comparative tests under controlled single conditions, which makes it difficult to obtain the actual flue gas emissions of specific targets. Summary of the invention

[0007] In order to solve the current research deficiencies in indoor simulation and behavior quantification of asphalt fume emissions, the present invention provides an indoor simulation and behavior quantification method based on the actual situation of fume emissions during pavement construction. The present invention achieves the purpose of keeping the indoor test associated with the environmental conditions of the construction site, quantifies the fume emission behavior of asphalt during the entire life cycle of pavement construction, and to a certain extent solves the difficulty of accurate quantification of on-site fume emissions due to the influence of climate.

[0008] The object of the present invention is achieved by the following technical solutions:

[0009] An indoor simulation method based on the actual situation of flue gas emissions during the road construction period, comprising the following steps:

[0010] Step 1: Design an indoor simulation device for flue gas emissions

[0011] The indoor simulation device for flue gas emissions includes a flue gas generation unit, a power unit, and a flue gas concentration detection unit. Each unit is tightly connected by a silica gel tube to form a relatively airtight environment, where:

[0012] The flue gas generation unit is provided with a first air inlet, a second air inlet, and a discharge port. The discharge port is used to obtain asphalt or asphalt mixture test samples at any time during the multi-dimensional flue gas emission behavior quantification test of asphalt and mixtures.

[0013] The power unit includes a first flowmeter, a second flowmeter, a first air pump, and a second air pump. The first air pump is connected to the first flowmeter through a silica gel tube, the first flowmeter is connected to the first air inlet of the flue gas generation unit through a silica gel tube, the second air pump is connected to the second flowmeter through a silica gel tube, and the second flowmeter is connected to the second air inlet of the flue gas generation unit through a silica gel tube.

[0014] The flue gas concentration detection unit is connected to the second air pump through a silica gel tube.

[0015] Step 2: Determine the evaluation index and degree standard for the field-indoor environment matching degree

[0016] Collect asphalt at different stages during the construction of the asphalt pavement and conduct tests on the evaluation index for the field-indoor environment matching degree, where:

[0017] The evaluation index for the field-indoor environment matching degree includes: (1) Three major indexes: penetration, softening point, and ductility; (2) Infrared spectrum special functional group index; (3) Contents of four components: asphaltene, resin, saturate, and aromatic.

[0018] In the degree standard of the evaluation index for the field-indoor environment matching degree, the difference range of each evaluation index for the field-indoor environment matching degree under different degree standard levels is:

[0019] (1) Grade 1: 4 mm < penetration < 8 mm; 4 °C < softening point < 8 °C; 8 cm < ductility < 12 cm; 2% < special functional group index < 3%; 4% < asphaltene content < 8%; 3% < resin content < 5%; 2% < saturate content < 5%; 2% < aromatic content < 4%;

[0020] (2) Grade 2: 2 mm ≤ Penetration ≤ 4 mm; 1 °C ≤ Softening Point ≤ 4 °C; 4 cm ≤ Ductility ≤ 8 cm; 1.5% ≤ Special Functional Group Index ≤ 2%; 3% ≤ Asphaltene Content ≤ 4%; 1.5% ≤ Resin Content ≤ 3%; 1.5% ≤ Saturated Phenol Content ≤ 2%; 1% ≤ Aromatic Phenol Content ≤ 2%;

[0021] (3) Grade 3: 1 mm ≤ Penetration < 2 mm; 0.5 °C ≤ Softening Point < 1 °C; 2 cm ≤ Ductility < 4 cm; 0.5% ≤ Special Functional Group Index < 1.5%; 1.5% ≤ Asphaltene Content < 3%; 1% ≤ Resin Content < 1.5%; 1% ≤ Saturated Phenol Content < 1.5%; 0.5% ≤ Aromatic Phenol Content < 1%;

[0022] (4) Grade 4: Penetration < 1 mm; Softening Point < 0.5 °C; Ductility < 2 cm; Special Functional Group Index < 0.5%; Asphaltene Content < 1.5%; Resin Content < 1%; Saturated Phenol Content < 1%; Aromatic Phenol Content < 0.5%;

[0023] Step 3. Determine the indoor simulation conditions based on the actual situation of flue gas emissions during the road construction period and the simulation device

[0024] Step 3-1. Combine the indoor simulation device for flue gas emissions, sample asphalt specimens under different test conditions, and conduct tests on the evaluation indexes of the field-indoor environment matching degree respectively;

[0025] Step 3-2. At different stages, when the evaluation indexes of the field-indoor environment matching degree of the asphalt specimens collected at the road construction site and the asphalt specimens collected in the laboratory meet Grade 2 or above, the test conditions are used as the indoor simulation conditions for asphalt flue gas emissions;

[0026] Step 4. Conduct indoor simulation tests on flue gas emissions

[0027] Under the indoor simulation conditions determined in Step 3, asphalt flue gas is generated through the indoor simulation device for flue gas emissions to conduct indoor simulation of flue gas emissions.

[0028] A multi-dimensional flue gas emission behavior quantification method for asphalt and mixtures based on the actual situation of flue gas emissions during the road construction period, comprising the following steps:

[0029] Step 1. Design an indoor simulation device for flue gas emissions

[0030] The indoor simulation device for flue gas emissions includes a flue gas generation unit, a power unit, and a flue gas concentration detection unit. Each unit is tightly connected by a silica gel tube to form a relatively airtight environment, where:

[0031] The flue gas generating unit is provided with a first air inlet, a second air inlet and a discharge port. The discharge port is used to obtain asphalt or asphalt mixture test samples at any time during the quantification test of multi-dimensional flue gas emission behavior of asphalt and mixtures.

[0032] The power unit includes a first flowmeter, a second flowmeter, a first air pump and a second air pump. The first air pump is connected to the first flowmeter through a silica gel tube, the first flowmeter is connected to the first air inlet of the flue gas generating unit through a silica gel tube, the second air pump is connected to the second flowmeter through a silica gel tube, and the second flowmeter is connected to the second air inlet of the flue gas generating unit through a silica gel tube.

[0033] The flue gas concentration detection unit is connected to the second air pump through a silica gel tube.

[0034] Step 2: Determine the evaluation indexes of the on-site - indoor environment matching degree

[0035] Collect asphalt at different stages during the construction of asphalt pavement and conduct tests on the evaluation indexes of the on-site - indoor environment matching degree. The evaluation indexes of the on-site - indoor environment matching degree include: (1) three indexes of penetration, softening point and ductility; (2) infrared spectrum special functional group index; (3) contents of four components of asphaltene, resin, saturate and aromatic.

[0036] Step 3: Determine the indoor simulation conditions based on the actual situation of flue gas emission during the pavement construction period and the simulation device

[0037] Step 3-1: Combine the indoor simulation device for flue gas emission, sample asphalt specimens under different test conditions, and conduct tests on the evaluation indexes of the on-site - indoor environment matching degree respectively.

[0038] Step 3-2: At different stages, take the test conditions when the evaluation indexes of the on-site - indoor environment matching degree of the asphalt specimens collected at the pavement construction site and the asphalt specimens collected in the laboratory meet level 2 or above as the indoor simulation conditions for asphalt flue gas emission.

[0039] Step 4: Carry out the quantification of multi-dimensional flue gas emission behavior of asphalt and mixtures

[0040] Under the indoor simulation conditions determined in Step 3, generate asphalt flue gas through the indoor simulation device for flue gas emission, and conduct the quantification of multi-dimensional flue gas emission behavior of asphalt and mixtures. The multi-dimensional flue gas emission behavior of asphalt and mixtures is quantified by indexes such as instantaneous concentration, emission rate and total emission amount. Among them: the index "instantaneous concentration" is directly obtained through the flue gas concentration detection unit; the index "emission rate" is calculated according to formula (a); the index "total emission amount" is calculated according to formula (b):

[0041]

[0042] Where: G is the flue gas release rate (kg / h); Q2 and Q1 are the display data of the second flowmeter and the first flowmeter (m 3 / h); t is the monitoring time (h); V is the volume of the glass bottle (m 3 ); M is the gas molecular weight; A is the volume concentration of the gas (ppm);

[0043]

[0044] Where: m is the total amount of flue gas released (kg); G is the flue gas release rate (kg / h); t is the monitoring time (h).

[0045] Compared with the prior art, the present invention has the following advantages:

[0046] 1. The indoor simulation method for flue gas emissions of the present invention not only provides an indoor simulation device for flue gas emissions, but also proposes an evaluation index for the matching degree between the on-site and indoor environments. In addition, based on the actual on-site flue gas emissions during the asphalt pavement construction period, the present invention stipulates the indoor simulation conditions based on the simulation device, achieving the purpose of keeping the indoor test associated with the construction site environmental conditions. The indoor simulation method for flue gas emissions in the present invention solves to a certain extent the difficulty that it is difficult to accurately quantify the on-site flue gas emissions affected by the climate.

[0047] 2. The indoor simulation method based on the actual on-site flue gas emissions during the pavement construction period in the present invention conducts multi-dimensional flue gas emission behavior quantification tests on asphalt and mixtures, and proposes different indexes such as instantaneous concentration, emission rate, and emission total amount. It not only measures the instantaneous concentration of asphalt fumes at the moment of emission in different stages from production to paving, but also quantifies the total amount of flue gas emissions of asphalt throughout the life cycle of pavement construction, providing a reliable basis for obtaining the flue gas data of the asphalt pavement construction life cycle and being conducive to accurately evaluating the environmental protection performance of asphalt materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] Figure 1 It is a schematic structural diagram of the indoor simulation device for on-site flue gas emissions during the asphalt pavement construction period of the present invention, where: 1. Flue gas generation unit, 2. Power unit, 3. Flue gas concentration detection unit, 4. Silicone tube, 1-1. Discharge port, 2-1. First flowmeter, 2-2. Second flowmeter, 2-3. First air pump, 2-4. Second air pump.

[0049] Figure 2 It is the quantification result of the emission behavior of hydrogen sulfide gas in the flue gas of rubber asphalt CRA-1 and rubber asphalt CRA-2. DETAILED DESCRIPTION OF THE INVENTION

[0050] The technical solution of the present invention is further described below in conjunction with the accompanying drawings, but is not limited thereto. Any modification or equivalent replacement of the technical solution of the present invention without departing from the spirit and scope of the technical solution of the present invention should be included in the protection scope of the present invention.

[0051] Specific implementation method 1. This implementation method provides an indoor simulation and behavior quantification method based on the actual situation of smoke emissions during road construction, and the method includes the following steps:

[0052] Step 1: Design a smoke emission indoor simulation device

[0053] like Figure 1 As shown, the indoor simulation device for smoke emission includes a smoke generating unit 1, a power unit 2 and a smoke concentration detection unit 3, and each unit is tightly connected by a silicone tube 4 to form a relatively closed environment, wherein:

[0054] The smoke generating unit 1 is provided with a first air inlet, a second air inlet and a discharge port 1-1, through which the test sample (asphalt or asphalt mixture) can be obtained at any time when conducting a quantitative test of multi-dimensional smoke emission behavior of asphalt or mixture;

[0055] The power unit 2 includes a first flow meter 2-1, a second flow meter 2-2, a first air pump 2-3 and a second air pump 2-4. The first air pump 2-3 is connected to the first flow meter 2-1 through a silicone tube 4. The first flow meter 2-1 is connected to the first air inlet of the smoke generating unit 1 through the silicone tube 4. The second air pump 2-4 is connected to the second flow meter 2-2 through the silicone tube 4. The second flow meter 2-2 is connected to the second air inlet of the smoke generating unit 1 through the silicone tube 4.

[0056] The readings of the first flow meter 2-1 and the second flow meter 2-2 are recorded as Q1 and Q2 respectively, the first air pump 2-3 is a direct-filling air pump, and the second air pump 2-4 is an intermittent air pump, and the mode is a pump suction mode. By adjusting the running time and the stop time of the second air pump 2-4 and the working state of the smoke generating unit 1, the indoor smoke emission environment can be matched with the construction site environment;

[0057] The smoke concentration detection unit 3 is connected to the second air pump 2 - 4 through a silicone tube 4 .

[0058] Step 2: Determine the evaluation index and degree standard of site-indoor environment matching

[0059] Asphalt was collected at different stages of the asphalt pavement construction process, and the site-indoor environment matching evaluation index test was carried out, including:

[0060] The on-site - indoor environment matching degree evaluation indicators include: (1) the three major indicators of penetration, softening point, and ductility; (2) the infrared spectrum special functional group index; (3) the contents of four components, namely asphaltene, resin, saturate, and aromatic, as shown in Table 1.

[0061] Table 1 Degree standards for on-site - indoor environment matching degree evaluation indicators

[0062]

[0063] Step 3: Determine the indoor simulation conditions based on the actual situation of flue gas emissions during the road construction period and the simulation device

[0064] (1) In combination with the indoor simulation device for flue gas emissions, asphalt samples under different test conditions are sampled and the on-site - indoor environment matching degree evaluation indicators are tested respectively.

[0065] (2) At different stages, the test conditions when the on-site - indoor environment matching degree evaluation indicators of the asphalt samples collected at the road construction site and the asphalt samples collected in the laboratory meet Grade 2 or above are used as the indoor simulation conditions for quantifying the asphalt flue gas emission behavior, where:

[0066] The different stages include 3 stages of the road construction period: asphalt thermal storage stage, asphalt mixture mixing stage, and mixture paving stage;

[0067] The methods for collecting asphalt samples at the road construction site and in the laboratory are as follows:

[0068] (a) Asphalt thermal storage stage: Sampling directly from the indoor reaction kettle / on-site asphalt heating tank, and the heating time is 0.5 - 168 h;

[0069] (b) Mixture mixing stage:

[0070] Indoor: After the asphalt mixture is mixed, the asphalt in the loose mixture is recovered by the extraction - distillation method, and the mixing time is 30 - 600 s;

[0071] On-site: After the mixture is mixed at the mixing station, samples are directly taken for the extraction - distillation test to recover the asphalt in the mixture, and the mixing time is 30 - 600 s;

[0072] (c) Mixture paving stage:

[0073] Indoor: After the mixture is mixed, it is left standing until the paving temperature, and the asphalt in the loose mixture is recovered by the extraction - distillation method. The paving temperature is the mixing temperature minus 0 - 40 °C;

[0074] On-site: Samples are taken at the road paving site for the extraction - distillation test to recover the asphalt in the mixture;

[0075] Step 4: Conduct smoke emission simulation tests and quantify the multi-dimensional smoke emission behavior of asphalt and mixture

[0076] Under the indoor simulation conditions determined in step 3, asphalt fume is generated by a fume emission indoor simulation device, and the fume emission behavior is quantified, where:

[0077] The quantitative indicators of the smoke emission behavior include instantaneous concentration, emission rate, and total emission amount;

[0078] The instantaneous concentration is directly obtained by a smoke concentration detection unit;

[0079] The emission rate is calculated according to formula (a);

[0080]

[0081] Where: G is the smoke release rate (kg / h); Q2 and Q1 are the display data of the second flow meter and the first flow meter respectively (m 3 / h); t is the monitoring time (h); V is the volume of the glass bottle (m 3 ); M is the molecular weight of the gas; A is the volume concentration of the gas (ppm);

[0082] The total amount of emissions is calculated according to formula (b):

[0083]

[0084] Where: m is the total amount of smoke released (kg); G is the smoke release rate (kg / h); t is the monitoring time (h).

[0085] This implementation method can be used to quantify the smoke emission behavior during the asphalt hot storage stage, and can also be used to quantify the smoke emission behavior during the asphalt mixture mixing and paving stage.

[0086] Specific embodiment 2. This embodiment is different from specific embodiment 1 in that the smoke generating unit 1 is suitable for asphalt material, the asphalt heating temperature is (softening point + 90)°C, the continuous heating time is 1h, 1.5h, 2h, 3h, 5h, and 10h respectively, and the operating time and rest time of the intermittent air pump 2-4 are 60s and 30s respectively.

[0087] Specific implementation method 3: This implementation method is different from specific implementation methods 1 to 2 in that the indoor simulation conditions refer to: the field-indoor environment matching evaluation index of the asphalt samples collected at the pavement construction site and the asphalt samples collected in the laboratory meets level 3. This implementation method is used to simulate the smoke emission behavior of the asphalt hot storage stage during the pavement construction period.

[0088] Specific implementation method 4: This implementation method is different from specific implementation methods 1 to 3 in that the running time and the rest time of the second air pump 2-4 are 30s and 60s respectively.

[0089] Specific implementation mode five: This implementation mode is different from specific implementation modes one to three in that the running time and the rest time of the second air pump 2-4 are 0s and 60s respectively.

[0090] Specific implementation method six: The difference between this implementation method and specific implementation methods one to three is that the running time and the rest time of the second air pump 2-4 are 60s and 0s respectively.

[0091] Specific implementation method seven: This implementation method is different from specific implementation methods one to six in that the indoor simulation conditions refer to: the site-indoor environment matching evaluation index of the asphalt samples collected at the pavement construction site and the asphalt samples collected in the laboratory meets level 2.

[0092] Specific implementation eight: This implementation differs from specific implementations one to six in that the indoor simulation conditions refer to: the site-indoor environment matching evaluation index of the asphalt samples collected at the pavement construction site and the asphalt samples collected in the laboratory meets level 4.

[0093] Specific embodiment 9: This embodiment is different from specific embodiments 1 to 8 in that the smoke generating unit 1 in the smoke emission indoor simulation device is suitable for asphalt mixture, the asphalt mixture mixing temperature is (storage temperature-5)°C, and the mixing time is 60s, 120s, 180s, 300s, 420s and 600s respectively. This embodiment simulates the smoke emission behavior of the asphalt mixture mixing stage during the pavement construction period.

[0094] Specific embodiment 10: This embodiment is different from specific embodiments 1 to 8 in that the smoke generating unit 1 in the smoke emission indoor simulation device is suitable for asphalt mixture, and the paving temperatures are (mixing temperature - 5) ° C, (mixing temperature - 10) ° C, and (mixing temperature - 15) ° C. This embodiment simulates the smoke emission behavior of asphalt mixture paving stage during pavement construction.

[0095] Embodiment 1:

[0096] This embodiment provides a method for indoor simulation of smoke emission based on the actual on-site smoke emission during asphalt pavement construction. The method includes three parts: an indoor simulation device for smoke emission, an evaluation index for on-site-indoor environment matching, and indoor simulation conditions based on the simulation device, wherein:

[0097] 1. Indoor simulation device for smoke emission: Figure 1As shown in the figure, the device includes a flue gas generation unit 1, a power unit 2, and a flue gas concentration detection unit 3. Each unit is tightly connected through a silica gel tube 4 to form a relatively airtight environment, where:

[0098] The flue gas generation unit 1 is provided with a first air inlet, a second air inlet, and a discharge port 1-1. Through the discharge port 1-1, test samples (asphalt or asphalt mixture) can be obtained at any time during the multi-dimensional flue gas emission behavior quantification test of asphalt or mixture.

[0099] The power unit 2 includes a first flowmeter 2-1, a second flowmeter 2-2, a first air pump 2-3, and a second air pump 2-4. The first air pump 2-3 is connected to the first flowmeter 2-1 through a silica gel tube 4. The first flowmeter 2-1 is connected to the first air inlet of the flue gas generation unit 1 through a silica gel tube 4. The second air pump 2-4 is connected to the second flowmeter 2-2 through a silica gel tube 4. The second flowmeter 2-2 is connected to the second air inlet of the flue gas generation unit 1 through a silica gel tube 4.

[0100] The readings of the first flowmeter 2-1 and the second flowmeter 2-2 are denoted as Q1 and Q2 respectively. The first air pump 2-3 is a direct filling type air pump, and the second air pump 2-4 is an intermittent type air pump. The adopted mode is pump suction type. By adjusting the running time and stopping time of the second air pump 2-4, the indoor flue gas emission environment can be matched with the construction site environment.

[0101] The flue gas concentration detection unit 3 is connected to the second air pump 2-4 through a silica gel tube 4.

[0102] II. Field - indoor environment matching degree evaluation index: The field - indoor environment matching degree evaluation index is three major indicators (penetration, softening point, ductility), infrared spectrum special functional group index, and four-component content, and the degree standard of the matching degree evaluation index is further formulated.

[0103] III. Indoor simulation conditions based on the simulation device: In the heat storage stage, the field - indoor environment matching degree evaluation indexes of the asphalt samples collected at the road construction site and the asphalt samples collected in the laboratory meet Grade 3.

[0104] In this embodiment, the flue gas generation unit 1 is applicable to asphalt materials. The asphalt heating temperature is (softening point + 90) °C, and the continuous heating times are 1h, 1.5h, 2h, 3h, 5h, and 10h respectively. The running time and stopping time of the intermittent air pump are 60s and 30s respectively.

[0105] In this embodiment, the results of the field - indoor environment matching degree evaluation index and the degree standard evaluation of rubber asphalt CRA - 1 are shown in Table 2.

[0106] Table 2 Results of the field - indoor environment matching degree evaluation index and degree standard evaluation of rubber asphalt CRA - 1

[0107]

[0108] Example 2:

[0109] This example provides a method for quantifying the flue gas emission behavior during the asphalt thermal storage stage based on the indoor simulation method of flue gas emissions on-site during the construction period of asphalt pavement. The method includes the following steps:

[0110] 1. Collect the asphalt during the asphalt thermal storage stage in the process of pavement construction of rubber asphalt CRA-1, and conduct tests on the evaluation indexes of the on-site - indoor environment matching degree.

[0111] 2. Combine the indoor flue gas emission simulation device in Example 1, and take the CRA-1 asphalt specimens heated at 180 ± 5 °C for 1 h, 1.5 h, 2 h, 3 h, 5 h, and 10 h respectively, and conduct tests on the evaluation indexes of the on-site - indoor environment matching degree.

[0112] 3. Take the test conditions when the evaluation indexes of the on-site - indoor environment matching degree of the asphalt specimens collected at the pavement construction site and the asphalt specimens collected in the laboratory meet Level 3 as the indoor simulation conditions for quantifying the flue gas emission behavior of asphalt.

[0113] 4. Under the determined indoor simulation conditions, generate asphalt flue gas through the indoor simulation device, and quantify the flue gas emission behavior of rubber asphalt CRA-1 during the thermal storage stage.

[0114] In this example, the quantification results of the flue gas emission behavior of rubber asphalt CRA-1 are as Figure 2 shown.

[0115] Example 3:

[0116] This example provides a method for quantifying the flue gas emission behavior during the asphalt thermal storage stage based on the indoor simulation method of flue gas emissions on-site during the construction period of asphalt pavement. The method includes the following steps:

[0117] 1. Collect the asphalt during the asphalt thermal storage stage in the process of pavement construction of rubber asphalt CRA-2, and conduct tests on the evaluation indexes of the on-site - indoor environment matching degree.

[0118] 2. Combine the indoor flue gas emission simulation device in Example 1, and take the CRA-2 asphalt specimens heated at 190 ± 5 °C for 1 h, 1.5 h, 2 h, 3 h, 5 h, and 10 h respectively, and conduct tests on the evaluation indexes of the on-site - indoor environment matching degree.

[0119] 3. When the matching degree evaluation index of the on-site and laboratory environments of the asphalt samples collected at the pavement construction site and the asphalt samples collected in the laboratory meets Level 3, the test conditions are the indoor simulation conditions for quantifying the asphalt fume emission behavior.

[0120] 4. Under the determined indoor simulation conditions, asphalt fumes are generated through an indoor simulation device, and the fume emission behavior of rubber asphalt CRA-2 during the heat storage stage is quantified.

[0121] In this embodiment, the quantification results of the fume emission behavior of rubber asphalt CRA-2 are as Figure 2 shown.

Claims

1. A method for indoor simulation of flue gas emissions based on the actual flue gas emissions during the road construction period, characterized in that The method comprises the following steps: Step 1: Design a smoke emission indoor simulation device The indoor simulation device for smoke emission comprises a smoke generating unit, a power unit, and a smoke concentration detection unit, and each unit is tightly connected by a silicone tube to form a relatively closed environment, wherein: The smoke generating unit is provided with a first air inlet, a second air inlet and a discharge port, and the discharge port is used to obtain asphalt or asphalt mixture test samples at any time when conducting a quantitative test of multi-dimensional smoke emission behavior of asphalt and mixture; The power unit comprises a first flow meter, a second flow meter, a first air pump and a second air pump, the first air pump is connected to the first flow meter through a silicone tube, the first flow meter is connected to the first air inlet of the smoke generating unit through the silicone tube, the second air pump is connected to the second flow meter through the silicone tube, and the second flow meter is connected to the second air inlet of the smoke generating unit through the silicone tube; The smoke concentration detection unit is connected to the second air pump through a silicone tube; Step 2: Determine the evaluation index and degree standard of site-indoor environment matching Asphalt was collected at different stages of the asphalt pavement construction process, and the site-indoor environment matching evaluation index test was carried out, including: The evaluation indicators of on-site and indoor environment matching include: (1) three major indicators: needle penetration, softening point, and ductility; (2) special functional group index of infrared spectrum; (3) content of four components: asphaltene, colloid, saturated phenol, and aromatic phenol; Step 3: Determine the indoor simulation conditions based on the actual smoke emission during the pavement construction period and the simulation device Step 3.

1. Combined with the indoor simulation device for flue gas emission, sample asphalt samples under different test conditions and conduct field-indoor environment matching evaluation index tests respectively; Step 3.2: At different stages, the test conditions when the field-indoor environment matching evaluation index of the asphalt samples collected at the pavement construction site and the asphalt samples collected in the laboratory meets level 2 or above are the indoor simulation conditions for asphalt fume emissions; Step 4: Conduct indoor simulation test of flue gas emission Under the indoor simulation conditions determined in step three, asphalt smoke is generated by a smoke emission indoor simulation device to perform indoor simulation of smoke emission.

2. The method for indoor simulation of flue gas emissions based on the actual flue gas emissions during the road construction period according to claim 1, characterized in that The first air pump is a direct-filling air pump, and the second air pump is an intermittent air pump. By adjusting the running time and the rest time of the second air pump and the working state of the smoke generating unit, the indoor smoke emission environment can be matched with the construction site environment.

3. The method for indoor simulation of flue gas emissions based on the actual flue gas emissions during the road construction period according to claim 1, characterized in that The different stages include asphalt hot storage stage, asphalt mixture mixing stage, and mixture paving stage.

4. The method for indoor simulation of flue gas emissions based on the actual flue gas emissions during the road construction period according to claim 1, characterized in that The method for collecting asphalt samples at the pavement construction site and in the laboratory is as follows: (1) Asphalt hot storage stage: direct sampling from indoor reactor / on-site asphalt heating tank; (2) Mixing stage: Indoor: After the asphalt mixture is mixed, the asphalt in the loose mixture is recovered by extraction-distillation; On-site: After the mixing station completes the mixing of the mixture, samples are directly taken for extraction-distillation test to recover the asphalt in the mixture; (3) Mixture paving stage: Indoor: After the mixture is mixed, let it stand until it reaches the paving temperature, and then use the extraction-distillation method to recover the asphalt in the loose mixture; Site: Sampling is carried out on the road surface during paving, and extraction-distillation test is conducted to recover asphalt in the mixture. During the indoor test, the heating time in the asphalt heat storage stage is 0.5 - 168 h; the mixing time in the asphalt mixture mixing stage is 30 - 600 s; the paving temperature in the mixture paving stage is the mixing temperature minus 0 - 40 °C.

5. The method for indoor simulation of flue gas emissions based on the actual flue gas emissions during the road construction period according to claim 1, characterized in that In the second step, the difference range of each on-site - indoor environment matching degree evaluation index under different standard grades is as follows: (1) Grade 1: 4 mm < penetration < 8 mm; 4 °C < softening point < 8 °C; 8 cm < ductility < 12 cm; 2% < special functional group index < 3%; 4% < asphaltene content < 8%; 3% < resin content < 5%; 2% < saturated phenol content < 5%; 2% < aromatic phenol content < 4%; (2) Grade 2: 2 mm ≤ penetration ≤ 4 mm; 1 °C ≤ softening point ≤ 4 °C; 4 cm ≤ ductility ≤ 8 cm; 1.5% ≤ special functional group index ≤ 2%; 3% ≤ asphaltene content ≤ 4%; 1.5% ≤ resin content ≤ 3%; 1.5% ≤ saturated phenol content ≤ 2%; 1% ≤ aromatic phenol content ≤ 2%; (3) Grade 3: 1 mm ≤ penetration < 2 mm; 0.5 °C ≤ softening point < 1 °C; 2 cm ≤ ductility < 4 cm; 0.5% ≤ special functional group index < 1.5%; 1.5% ≤ asphaltene content < 3%; 1% ≤ resin content < 1.5%; 1% ≤ saturated phenol content < 1.5%; 0.5% ≤ aromatic phenol content < 1%; (4) Grade 4: penetration < 1 mm; softening point < 0.5 °C; ductility < 2 cm; special functional group index < 0.5%; asphaltene content < 1.5%; resin content < 1%; saturated phenol content < 1%; aromatic phenol content < 0.5%.

6. A multi-dimensional flue gas emission behavior quantification method for asphalt and mixtures based on the actual flue gas emissions during the road construction period, characterized in that The method includes the following steps: Step 1: Design an indoor simulation device for flue gas emission The indoor simulation device for flue gas emission includes a flue gas generation unit, a power unit, and a flue gas concentration detection unit. Each unit is tightly connected by a silica gel tube to form a relatively closed environment, where: The flue gas generation unit is provided with a first air inlet, a second air inlet, and a discharge port. The discharge port is used to obtain asphalt or asphalt mixture test samples at any time during the multi-dimensional flue gas emission behavior quantification test of asphalt and mixture. The power unit includes a first flowmeter, a second flowmeter, a first air pump, and a second air pump. The first air pump is connected to the first flowmeter through a silica gel tube, the first flowmeter is connected to the first air inlet of the flue gas generation unit through a silica gel tube, the second air pump is connected to the second flowmeter through a silica gel tube, and the second flowmeter is connected to the second air inlet of the flue gas generation unit through a silica gel tube; The flue gas concentration detection unit is connected to the second air pump through a silica gel tube; Step 2: Determine the on-site - indoor environment matching degree evaluation index Collect asphalt at different stages during the construction of the asphalt pavement and conduct tests on the on-site - indoor environment matching degree evaluation index. The on-site - indoor environment matching degree evaluation index includes: (1) Three major indexes: penetration, softening point, and ductility; (2) Infrared spectrum special functional group index; (3) Contents of four components: asphaltene, resin, saturated phenol, and aromatic phenol. Step 3. Determine the indoor simulation conditions based on the actual situation of flue gas emissions during the road construction period and the simulation device Step 3-1. Combine the indoor simulation device for flue gas emissions, sample asphalt specimens under different test conditions, and conduct on-site-indoor environmental matching degree evaluation index tests respectively; Step 3-2. At different stages, when the on-site-indoor environmental matching degree evaluation indexes of the asphalt specimens collected at the road construction site and the asphalt specimens collected in the laboratory meet Grade 2 or above, the test conditions are the indoor simulation conditions for quantifying the asphalt flue gas emission behavior; Step 4. Carry out multi-dimensional quantification of asphalt and mixture flue gas emission behavior Under the indoor simulation conditions determined in Step 3, generate asphalt flue gas through the indoor simulation device for flue gas emissions, and conduct multi-dimensional quantification of asphalt and mixture flue gas emission behavior. The indexes of the behavior quantification include instantaneous concentration, emission rate, and total emission amount.

7. The multi-dimensional flue gas emission behavior quantification method for asphalt and mixtures based on the actual flue gas emissions during the road construction period according to claim 6, characterized in that The different stages include the asphalt heat storage stage, the asphalt mixture mixing stage, and the mixture paving stage.

8. The multi-dimensional flue gas emission behavior quantification method for asphalt and mixtures based on the actual flue gas emissions during the road construction period according to claim 6, characterized in that The methods for collecting asphalt specimens at the road construction site and in the laboratory are as follows: (1) Asphalt heat storage stage: Direct sampling from the indoor reaction kettle / on-site asphalt heating tank; (2) Mixture mixing stage: Indoor: After the asphalt mixture is mixed, recover the asphalt in the loose mixture by extraction-distillation method; On-site: After the mixture is mixed at the mixing station, directly sample and conduct extraction-distillation test to recover the asphalt in the mixture; (3) Mixture paving stage: Indoor: After the mixture is mixed, let it stand until the paving temperature, and recover the asphalt in the loose mixture by extraction-distillation method; On-site: Sample at the road paving site and conduct extraction-distillation test to recover the asphalt in the mixture; During the indoor test, the heating time in the asphalt heat storage stage is 0.5 - 168h; the mixing time in the asphalt mixture mixing stage is 30 - 600s; the paving temperature in the mixture paving stage is the mixing temperature minus 0 - 40°C.

9. The multi-dimensional flue gas emission behavior quantification method for asphalt and mixtures based on the actual flue gas emissions during the road construction period according to claim 6, characterized in that In Step 2, the difference ranges of each on-site-indoor environmental matching degree evaluation index under different degree standard grades are as follows: (1) Grade 1: 4mm < penetration < 8mm; 4°C < softening point < 8°C; 8cm < ductility < 12cm; 2% < special functional group index < 3%; 4% < asphaltene content < 8%; 3% < resin content < 5%; 2% < saturated phenol content < 5%; 2% < aromatic phenol content < 4%; (2) Grade 2: 2mm ≤ penetration ≤ 4mm; 1°C ≤ softening point ≤ 4°C; 4cm ≤ ductility ≤ 8cm; 1.5% ≤ special functional group index ≤ 2%; 3% ≤ asphaltene content ≤ 4%; 1.5% ≤ resin content ≤ 3%; 1.5% ≤ saturated phenol content ≤ 2%; 1% ≤ aromatic phenol content ≤ 2%; (3) Grade 3: 1mm ≤ penetration < 2mm; 0.5°C ≤ softening point < 1°C; 2cm ≤ ductility < 4cm; 0.5% ≤ special functional group index < 1.5%; 1.5% ≤ asphaltene content < 3%; 1% ≤ resin content < 1.5%; 1% ≤ saturated phenol content < 1.5%; 0.5% ≤ aromatic phenol content < 1%; (4) Grade 4: Penetration < 1 mm; Softening point < 0.5 °C; Ductility < 2 cm; Special functional group index < 0.5%; Asphaltene content < 1.5%; Resin content < 1%; Saturated phenol content < 1%; Aromatic phenol content < 0.5%.

10. The multi-dimensional flue gas emission behavior quantification method for asphalt and mixtures based on the actual flue gas emissions during the road construction period according to claim 6, characterized in that The instantaneous concentration is directly obtained by the flue gas concentration detection unit; the emission rate is calculated according to formula (a); the total emission is calculated according to formula (b). Where: G is the flue gas emission rate; Q2 and Q1 are the data displayed by the second flowmeter and the first flowmeter respectively; t is the monitoring time; V is the volume of the glass bottle; M is the gas molecular weight; m is the total flue gas emission; A is the volume concentration of the gas.

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