Asphalt smoke harmful component collecting and analyzing device of asphalt mixture mixing plant

Abstract

The utility model discloses an asphalt smoke harmful component collecting and analyzing device for an asphalt mixture mixing plant, belongs to an asphalt smoke collecting device, and aims to solve the technical problems that the application scene of the conventional testing device is limited in a laboratory, the difference between the conventional testing device and the actual production construction link is large, the measurement result is rough, and the testing efficiency is high. According to the technical scheme, the device structurally comprises a compressed water-free air tank, a mixing plant, a speed-adjustable digital display gas sampler I, a self-heating constant-temperature oil gas assembly, a speed-adjustable digital display gas sampler II and a gas sampling detection assembly which are sequentially communicated through a pipeline; the self-heating constant-temperature oil gas assembly comprises a self-heating constant-temperature oil gas tank, a first container and a second container are arranged in the self-heating constant-temperature oil gas tank, a first bubble absorption pipe is arranged in the first container, one end of the first bubble absorption pipe is located at the lower position of the middle of the first container, and the first bubble absorption pipe is communicated with the first container.

Description

Technical Field

[0001] The utility model relates to an asphalt fume collecting device, in particular to an asphalt fume harmful component collecting and analyzing device of an asphalt mixture mixing plant. Background Art

[0002] Asphalt pavement has unique advantages in road paving, so it is widely used. However, during the high-temperature mixing and paving of asphalt mixture, a large amount of smoke containing harmful components will be generated. The smoke contains thousands of substances, some of which are not only harmful to human health, but also pollute the natural environment.

[0003] In order to suppress the generation of asphalt fume, most methods of adding inhibitors to asphalt are adopted. In order to detect the inhibitory effect of the inhibitor, it is usually necessary to conduct experiments on the detection of asphalt fume components. In the experiments on the detection of asphalt fume components, most of the existing experimental equipment is limited to the laboratory, which is quite different from the actual production and construction links. The measurement results are rough, unable to distinguish between organic and inorganic substances and the types and concentrations of substances, and the errors of parallel tests are large. The existence of these problems will affect the accuracy of the asphalt fume detection results. Summary of the invention

[0004] The technical task of the utility model is to provide a device for collecting and analyzing harmful components of asphalt smoke of an asphalt mixture mixing plant, so as to solve the problems that the applicable scenarios of existing test devices are limited to laboratories, which are quite different from the actual production and construction links, the measurement results are rough, and it is impossible to distinguish between organic and inorganic substances and the types and concentrations of substances, and the parallel test errors are large and affect the accuracy of asphalt smoke detection results.

[0005] The technical task of the utility model is achieved in the following way: a device for collecting and analyzing harmful components of asphalt smoke of an asphalt mixture mixing plant, comprising a compressed water-free air tank, a mixing plant, a speed-adjustable digital display gas sampler 1, a self-heating constant temperature oil and gas component, a speed-adjustable digital display gas sampler 2 and a gas sampling and detection component which are sequentially connected through pipelines;

[0006] The self-heating constant temperature oil and gas component includes a self-heating constant temperature oil and gas box, in which container one and container two are arranged. Container one is provided with bubble absorption tube one, one end of bubble absorption tube one is located at a lower position in the middle of container one and bubble absorption tube one is connected with container one, and the other end of bubble absorption tube one passes through the upper end surface of container one and is connected with adjustable speed digital display gas sampler one; container two is provided with bubble absorption tube two, one end of bubble absorption tube two is located at a lower position in the middle of container two and bubble absorption tube two is connected with container two, the other end of bubble absorption tube two passes through the upper end surface of container two and is connected with container one, and container two is connected with adjustable speed digital display gas sampler two through a pipeline.

[0007] Preferably, a gas sampling clamp is provided at one end of the bubble absorption tube close to the speed-adjustable digital gas sampler, and a filter membrane is provided in the gas sampling clamp.

[0008] Preferably, the gas sampling and detection assembly comprises a gas sampling bag and a portable gas detector, and the second adjustable speed digital display gas sampler is respectively connected to the gas sampling bag and the portable gas detector through a two-way valve.

[0009] Preferably, the adjustable speed digital display gas sampler 1 and the adjustable speed digital display gas sampler 2 both include a digital display screen and a speed adjustment button.

[0010] Preferably, the gas sampling clamp is a tetrafluoroethylene gas sampling clamp, and the filter membrane adopts an organic acid-alkali resistant PTFE filter membrane. The diameter of the filter membrane is 47 mm and the pore size of the filter membrane is 0.22 μm.

[0011] Preferably, the pipeline is a glass tube or a silicone tube, and the diameter of the pipeline is 5mm to 20mm.

[0012] Preferably, the bubble absorption tube 1 and the bubble absorption tube 2 are filled with an adsorption solvent, and the adsorption solvent is cyclohexane.

[0013] Preferably, the self-heating constant temperature oil-gas box is filled with oil medium, and the oil medium is dimethyl silicone oil.

[0014] Preferably, the gas sampling bag is an aluminum foil sampling bag.

[0015] Preferably, the portable gas detector adopts an electrochemical sensor.

[0016] The asphalt smoke harmful component collection and analysis device of the asphalt mixture mixing plant of the utility model has the following advantages:

[0017] (I) The utility model connects various components in series through glass tubes or rubber tubes, and introduces the gas in the compressed anhydrous air tank into the mixing plant. The mixing plant has its own stirring function, and the production environment of the mixing plant is used as the asphalt fume generating device. The air flow rate is controlled and displayed in real time through an adjustable pump, and the air flow rate is controlled at 0.2L / min ～2L / min; after the mixing plant is heated to the production temperature, open the air tank and pump to start collecting. The solid components in the asphalt fume will adhere to the glass fiber filter membrane, and the mass of the solid particles can be weighed by a high-precision analytical balance; the organic components will dissolve in cyclohexane, and the type of pollutants will be identified and their concentrations will be quantified by gas chromatography-mass spectrometry (GCMS); the inorganic gas part will be collected through a gas sampling bag, and after its composition is determined by GCMS, it can also be detected in real time by a portable detector of the corresponding substance; the utility model has the characteristics of accurate and convenient measurement, organic and inorganic separation measurement, qualitative substance type and quantitative concentration, and does not affect the production site;

[0018] (ii) The air tank of the utility model contains compressed water-free air. The pump can be adjusted appropriately according to the size of the mixing plant space and display the air flow rate in real time to achieve precise control. The flow rate is controlled within 0.2 ～ Within 2L / min;

[0019] (III) The utility model is applicable to asphalt mixing plants. It is necessary to drill a small hole at each end of the closed space of the mixing plant and connect a silicone tube to realize a closed environment. The measurement can be carried out during the mixing and production of asphalt mixture, which will not affect the production and the measurement conditions are consistent with the engineering application conditions. The measurement results are more accurate. At the same time, it is used to control the flow rate of water-free air. The mixing plant has heating constant temperature and stirring functions.

[0020] (IV) The utility model solves the problems of the existing test device, such as the applicable scene is limited to the laboratory, there is a big difference with the actual production and construction links, the measurement results are rough, it is impossible to distinguish between organic and inorganic substances and the types and concentrations of substances, and the parallel test errors are large, and improves the accuracy of asphalt smoke detection results;

[0021] (V) The utility model uses a glass fiber filter membrane to collect solid particles of asphalt smoke. Compared with the traditional glass fiber filter cartridge, it has a smaller workmanship error and can collect solid particles more fully. The filter pore diameter of the filter membrane is 0.22 microns, which is the dividing point between the diameter of solid particles and the diameter of gas. The organic acid- and alkali-resistant PTFE filter membrane is used, which can effectively prevent the acidic or alkaline substances in the asphalt smoke from corroding and causing the filter membrane to be damaged during use.

[0022] (VI) The utility model uses cyclohexane (purity must be greater than 90%) fixed to 10 ml in two bubble absorption tubes connected in series as a solvent to dissolve asphalt fume. 1 ml of cyclohexane can dissolve about 0.5 g of asphalt, so cyclohexane can effectively absorb a sufficient amount of asphalt fume for microscopic testing and analysis; the bubble absorption tubes 1 and 2 can achieve a closed environment, have a small tube diameter and are inserted into the bottom of the solvent, which can generate a large number of bubbles so that the organic components in the asphalt fume are fully dissolved by cyclohexane;

[0023] (VII) The solubility of cyclohexane in asphalt fume is greatly affected by the solvent temperature. In order to accurately control the cyclohexane solvent collection temperature, the utility model adds a self-heating constant temperature oil bath component on the outside of the bubble absorption tube 1 and the bubble absorption tube 2, which can maintain the cyclohexane temperature in the bubble absorption tube at 25°C during the collection time, and the temperature control is accurate, reducing the influence of external conditions on the measurement results, and the utility model has good portability;

[0024] (8) The gas passes through a rotary two-way valve and is connected to an external portable inorganic gas detector to effectively measure the concentration and type of inorganic gas in the asphalt fume in real time;

[0025] (IX) The gas passes through a rotary two-way valve and is connected to an external gas sampling bag. The concentration of harmful gases in the sampling bag can be used to determine whether cyclohexane has fully adsorbed the asphalt fume. If it is not fully adsorbed, the test parameters can be adjusted by increasing the volume of cyclohexane solution or reducing the air flow rate of the pump;

[0026] (10) After the collection of the present invention is completed, the gas components in the cyclohexane solution and the gas sampling bag are analyzed by gas chromatography-mass spectrometry to identify the types of substances and quantitatively analyze the concentrations of substances.

[0027] Therefore, the utility model has the characteristics of reasonable design, simple structure, easy processing, small size, convenient use, multi-purpose, etc., and thus has good promotion and use value. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The utility model is further described below in conjunction with the accompanying drawings.

[0029] Attached Figure 1 This is a schematic diagram of the structure of a device for collecting and analyzing harmful components of asphalt smoke from an asphalt mixture mixing plant.

[0030] In the figure: 1. Compressed anhydrous air tank, 2. Mixing plant, 3. Adjustable speed digital display gas sampler 1, 4. Adjustable speed digital display gas sampler 2, 5. Self-heating constant temperature oil and gas box, 6. Container 1, 7. Container 2, 8. Bubble absorption tube 1, 9. Bubble absorption tube 2, 10. Gas sampling clamp, 11. Filter membrane, 12. Gas sampling bag, 13. Portable gas detector, 14. Two-way valve, 15. Digital display screen, 16. Speed ​​control button, 17. Adsorption solvent, 18. Oil medium, 19. Pipeline. DETAILED DESCRIPTION

[0031] With reference to the accompanying drawings and specific embodiments of the specification, a device for collecting and analyzing harmful components of asphalt smoke of an asphalt mixture mixing plant of the present invention is described in detail below.

[0032] Example:

[0033] As attached Figure 1As shown, this embodiment provides a device for collecting and analyzing harmful components of asphalt smoke of an asphalt mixture mixing plant, and its structure includes a compressed water-free air tank 1, a mixing plant 2, an adjustable speed digital display gas sampler 3, a self-heating constant temperature oil and gas component, an adjustable speed digital display gas sampler 4 and a gas sampling and detection component which are sequentially connected through pipelines.

[0034] The self-heating constant temperature oil and gas component in this embodiment includes a self-heating constant temperature oil and gas box 5, in which container 16 and container 27 are installed, a bubble absorption tube 18 is installed in container 16, one end of the bubble absorption tube 18 is located in the lower middle part of container 16 and the bubble absorption tube 18 is connected to container 16, and the other end of the bubble absorption tube 18 passes through the upper end surface of container 16 and is connected to the adjustable speed digital display gas sampler 13; a bubble absorption tube 29 is installed in container 27, one end of the bubble absorption tube 29 is located in the lower middle part of container 27 and the bubble absorption tube 29 is connected to container 27, the other end of the bubble absorption tube 29 passes through the upper end surface of container 27 and is connected to container 16, and container 27 is connected to the adjustable speed digital display gas sampler 24 through a pipeline 19.

[0035] A gas sampling clamp 10 is installed at one end of the bubble absorption tube 8 in this embodiment close to the speed-adjustable digital gas sampler 3, and a filter membrane 11 is installed in the gas sampling clamp 10.

[0036] The gas sampling and detection assembly in this embodiment includes a gas sampling bag 12 and a portable gas detector 13. The adjustable speed digital display gas sampler 24 is connected to the gas sampling bag 12 and the portable gas detector 13 through a two-way valve 14 respectively.

[0037] The speed-adjustable digital-display gas sampler 1 3 and the speed-adjustable digital-display gas sampler 2 4 in this embodiment both include a digital display screen 15 and a speed adjustment button 16 .

[0038] The gas sampling clamp 10 in this embodiment is a tetrafluoroethylene gas sampling clamp, and the filter membrane 11 adopts an organic acid- and alkali-resistant PTFE filter membrane. The diameter of the filter membrane is 47 mm, and the pore size of the filter membrane is 0.22 μm.

[0039] The pipeline 19 in this embodiment is made of glass tube or silicone tube, and the diameter of the pipeline is 5mm. ～ 20mm

[0040] In this embodiment, the bubble absorption tube 1 8 and the bubble absorption tube 2 9 are filled with an adsorption solvent 17, and the volume of the bubble absorption tube 1 8 and the bubble absorption tube 2 9 is 10 ～ 75ml, transparent in color, self-heating constant temperature oil bath component with a temperature control range of 0°C ～200°C, the adsorption solvent 17 in the bubble absorption tube 1 8 and the bubble absorption tube 2 9 is cyclohexane. The purity of the adsorption solvent cyclohexane must be not less than 90%, and the bubble port diameter of the bubble absorption tube 1 8 and the bubble absorption tube 2 9 is 1 mm ～ 5mm. The cyclohexane solution obtained after the cyclohexane solvent adsorption is completed needs to be at 1℃ ～ The samples were kept at a constant temperature of 6°C and measured by gas chromatography-mass spectrometry (GCMS). The injection method of the gas chromatography-mass spectrometry (GCMS) was direct injection or headspace injection.

[0041] The self-heating constant temperature oil-gas box 5 in this embodiment is filled with oil medium 18, and the oil medium is dimethyl silicone oil.

[0042] The gas sampling bag 12 in this embodiment is an aluminum foil sampling bag.

[0043] The portable gas detector 13 in this embodiment uses an electrochemical sensor to measure the gases sulfur dioxide, hydrogen sulfide, carbon monoxide and nitrogen dioxide. The portable gas detector measures sulfur dioxide in a range of 0 ～ 50PPM, the measuring range of hydrogen sulfide is 0 ～ 20PPM, the measuring range of carbon monoxide is 0 ～ 2000PPM, the measuring range of nitrogen dioxide is 0 ～ 50PPM.

[0044] The specific implementation is as follows:

[0045] (1) Turn on the self-heating constant temperature oil bath assembly and set the temperature to 25°C;

[0046] (2) respectively, fill the bubble absorption tube 18 and the bubble absorption tube 29 with cyclohexane adsorption solvent fixed to 10 ml, insert the bubble ports at the lower ends of the bubble absorption tube 18 and the bubble absorption tube 29 into the bottom of the container 16 and the container 27, seal the air inlet ends of the bubble absorption tube 18 and the bubble absorption tube 29 and the container 16 and the container 27 with frosted glass ports, and seal the bubble absorption tube 18 and the bubble absorption tube 29 in series with a glass tube or a rubber tube;

[0047] (3) When the temperature of the self-heating constant temperature oil bath 5 is stabilized at about 25°C, the two bubble absorption tubes 1 8 and 2 9 connected in series are placed in the self-heating constant temperature oil bath 5;

[0048] (4) The right side of the self-heating constant temperature oil bath 5 is connected to the speed-adjustable digital display gas sampler 1 3, and the left side is connected to the left side of the speed-adjustable digital display gas sampler 2 4 through a glass tube or a silicone tube;

[0049] (5) Connect the right side of the adjustable speed digital display gas sampler 24 to the left side of the two-way valve 14 through a glass tube or a silicone tube;

[0050] (6) Turn on the portable gas detector 13 in a clean air environment and wait for its reading to stabilize;

[0051] (7) Connect the two outlets on the right side of the two-way valve 14 to the gas sampling bag 12 and the portable gas detector 13 through glass tubes or silicone tubes;

[0052] (8) Take a filter membrane 11 that has been dried to a constant weight, weigh its mass using a high-precision analytical balance (accuracy 0.1 mg) and record it;

[0053] (9) Place the filter membrane 11 into the gas sampling clamp 10, connect the left side of the gas sampling clamp 10 to the right outlet of the adjustable speed digital display gas sampler 3 through a glass tube or a silicone tube, and connect the right side of the gas sampling clamp 10 to the left side of the self-heating constant temperature oil bath 5 through a glass tube or a silicone tube;

[0054] (10) Start the mixing plant 2 without introducing air, and heat the mixing plant 2 to the production temperature while stirring;

[0055] (11) After the mixing plant 2 is heated to the production temperature, the outlet of the compressed anhydrous air tank 1 and the left inlet of the mixing plant 2 are connected through a glass tube or a silicone tube, and the right outlet of the mixing plant 2 and the left inlet of the adjustable speed digital display gas sampler 3 are connected through a glass tube or a silicone tube;

[0056] (12) Open the compressed water-free air tank 1, and then open the adjustable speed digital display gas sampler 1 3 and the adjustable speed digital display gas sampler 2 4, and press the timer to start timing.

[0057] (13) Keep the device in place during the collection process and end the sampling after 1 hour.

[0058] (14) Turn off the adjustable speed digital display gas sampler 1 3 and the adjustable speed digital display gas sampler 2 4 in sequence;

[0059] (15) Close the compressed water-free air tank 1;

[0060] (16) Remove the gas sampling clamp 10, take out the filter membrane 11 and put it into a dryer to dry. After drying to constant weight, weigh it with an analytical balance (accuracy 0.1 mg), and subtract the first weighing result, that is, the mass of the solid particles;

[0061] (17) The cyclohexane solution (organic liquid gas component) that has absorbed the asphalt fume and the gas in the gas sampling bag 12 (inorganic gas component) are subjected to gas chromatography-mass spectrometry (GCMS) to identify the substance types and quantify their concentrations.

[0062] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the utility model.

Claims

1. A device for collecting and analyzing harmful components of asphalt smoke from an asphalt mixture mixing plant, characterized in that: It includes a compressed water-free air tank, a mixing plant, a speed-adjustable digital display gas sampler 1, a self-heating constant temperature oil and gas component, a speed-adjustable digital display gas sampler 2 and a gas sampling and detection component which are sequentially connected through pipelines; The self-heating constant temperature oil and gas component includes a self-heating constant temperature oil and gas box, in which container one and container two are arranged. Container one is provided with bubble absorption tube one, one end of bubble absorption tube one is located at a lower position in the middle of container one and bubble absorption tube one is connected with container one, and the other end of bubble absorption tube one passes through the upper end surface of container one and is connected with adjustable speed digital display gas sampler one; container two is provided with bubble absorption tube two, one end of bubble absorption tube two is located at a lower position in the middle of container two and bubble absorption tube two is connected with container two, the other end of bubble absorption tube two passes through the upper end surface of container two and is connected with container one, and container two is connected with adjustable speed digital display gas sampler two through a pipeline.

2. The device for collecting and analyzing harmful components of asphalt smoke of an asphalt mixture mixing plant according to claim 1 is characterized in that: A gas sampling clamp is arranged at one end of the bubble absorption tube close to the speed-adjustable digital display gas sampler, and a filter membrane is arranged in the gas sampling clamp.

3. The device for collecting and analyzing harmful components of asphalt smoke of an asphalt mixture mixing plant according to claim 1 is characterized in that: The gas sampling and detection component comprises a gas sampling bag and a portable gas detector, and the second adjustable speed digital display gas sampler is respectively connected to the gas sampling bag and the portable gas detector through a two-way valve.

4. The device for collecting and analyzing harmful components of asphalt smoke of an asphalt mixture mixing plant according to claim 1 is characterized in that: The speed-adjustable digital-display gas sampler 1 and the speed-adjustable digital-display gas sampler 2 both comprise a digital display screen and a speed adjustment button.

5. The device for collecting and analyzing harmful components of asphalt smoke of an asphalt mixture mixing plant according to claim 2 is characterized in that: The gas sampling clamp is a tetrafluoroethylene gas sampling clamp, and the filter membrane adopts an organic acid-alkali resistant PTFE filter membrane. The diameter of the filter membrane is 47 mm, and the pore size of the filter membrane is 0.22 μm.

6. The device for collecting and analyzing harmful components of asphalt smoke of an asphalt mixture mixing plant according to claim 1, characterized in that: The pipeline is made of glass tube or silicone tube, and the diameter of the pipeline is 5mm~20mm.

7. The device for collecting and analyzing harmful components of asphalt smoke of an asphalt mixture mixing plant according to claim 1 is characterized in that: The first bubble absorption tube and the second bubble absorption tube are filled with an adsorption solvent, and the adsorption solvent is cyclohexane.

8. The device for collecting and analyzing harmful components of asphalt smoke of an asphalt mixture mixing plant according to claim 1 is characterized in that: The self-heating constant temperature oil-gas box is filled with oil medium, and the oil medium is dimethyl silicone oil.

9. The device for collecting and analyzing harmful components of asphalt smoke of an asphalt mixture mixing plant according to claim 3 is characterized in that: The gas sampling bag is an aluminum foil sampling bag.

10. The device for collecting and analyzing harmful components of asphalt smoke of an asphalt mixture mixing plant according to claim 3, characterized in that: The portable gas detector adopts an electrochemical sensor.

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