CN115445345A - Asphalt flue gas component capturing device and testing method - Google Patents

Abstract

An asphalt fume component capture device and testing method, belonging to the technical field of asphalt fume treatment, can solve the problem that the current asphalt road industry cannot capture the flue gas components in real time during the asphalt and modified asphalt process, and cannot accurately obtain the hot mix asphalt process. Smoke emissions and the resulting inaccurate environmental research. It includes a dry heat supply unit, a flue gas generating unit, a flue gas component capture unit and a flue gas purification unit, the end of the dry heat supply unit is connected to the head end of the flue gas generating unit through a pipe, and The end is connected to the head end of the flue gas component capturing unit through a pipe, and the end of the flue gas component capturing unit is connected to the head end of the flue gas purification unit through a pipe. The device of the present invention considers the influence of air composition and air flow rate on the generation of asphalt fume, not only can realize the quantitative capture and collection of the components of asphalt fume, but also can realize the real-time detection of the flue gas flow in the process of hot mixing asphalt.

Description

A kind of asphalt fume component capture device and testing method

technical field

The invention belongs to the technical field of asphalt fume treatment, and in particular relates to a device for capturing components of asphalt fume and a testing method.

Background technique

During the "14th Five-Year Plan" period, the construction of my country's ecological civilization has entered a critical period of focusing on carbon reduction, promoting the synergy of pollution reduction and carbon reduction, promoting the comprehensive green transformation of economic and social development, and realizing the improvement of ecological environment quality from quantitative change to qualitative change. As an important part of carbon emissions, the road transportation industry plays an important role in the construction of ecological civilization in my country. According to statistics, the carbon emissions of the transportation industry account for about 10.4% of my country's total carbon emissions, especially road transportation, which currently accounts for more than 85% of the country's total transportation carbon emissions, and is the absolute main body of transportation carbon emissions and the focus of emission reduction. As the main bonding material in highway pavement, asphalt is used more and more in expressways and urban roads due to its excellent material properties.

However, a large amount of exhaust gas pollution will be generated during the production, service and recycling of asphalt roads. Asphalt fume is the aerosol and vapor produced by the heating of asphalt and the combustion of asphalt-containing substances. Since asphalt is a high molecular polymer, the composition of the smoke generated during its production and use is also extremely complex. Studies have shown that asphalt fume is mainly composed of liquid hydrocarbon particles and gaseous hydrocarbons and their derivatives, which can cause significant irritation to the human skin, respiratory system, and mucous membranes. Among them, anthracene-naphthalene, phenol, acridine, pyridine, benzopyrene and other substances in asphalt flue gas will have great harm to human health and natural ecological environment. In recent years, the state and local governments have successively promulgated a number of environmental protection policy documents, which put forward higher requirements for the comprehensive treatment of VOC (volatile organic compounds), so both asphalt production and construction are facing huge environmental pressure. At the same time, the output and composition of asphalt fume have a certain degree of correlation with the oxygen content of the air and the contact area of the air. Reasonably capturing asphalt components and scientifically exploring the impact of asphalt fume on the road industry have great practical significance for road industry research and actual production.

However, at present, many asphalt fume capture and collection devices and equipment for the road industry are concentrated in bag filter, boiler dust collector, filter cartridge dust collector, cyclone dust collector and manual collection, which is not only expensive, time-consuming and labor-intensive. And it cannot fully capture the flue gas components due to changes in the external environment such as air components and flow rates, and it is impossible to accurately determine the quantitative research on asphalt production, research and development, and environmental protection treatment. Based on the above reasons, the development of an asphalt fume component capture device and testing method is of great significance for the production and environmental protection of the road industry.

Contents of the invention

Aiming at the deficiencies in the current industry such as the inability to quantitatively evaluate the influence of air components and flow rates on asphalt fume components, and the inability to accurately capture asphalt fume, the invention provides a device for capturing asphalt fume components and a testing method. The invention can not only realize the collection and purification of asphalt mixture smoke, but also realize the real-time detection of the smoke concentration in the asphalt.

The present invention adopts following technical scheme:

A device for capturing asphalt smoke components, comprising a dry heat supply unit, a smoke generation unit, a smoke component capture unit and a smoke purification unit, the end of the dry heat supply unit is connected to the smoke generation unit through a pipe The end of the flue gas generating unit is connected to the head end of the flue gas component capture unit through a pipe, and the end of the flue gas component capture unit is connected to the head end of the flue gas purification unit through a pipe.

Further, the dry heat air supply unit includes an air tank, a condenser 1, a heat pipe 1, a heat pipe 2 and an evaporator 1, the outlet of the gas tank is connected to one end of the heat pipe 1 through a pipe, and an air valve is provided on the pipe 1. A first flow meter and a pipe connector, the other end of the heat pipe 1 is connected to one end of the heat pipe 2 through the pipe connector, the heat pipe 1 is located in the condenser 1, and the heat pipe 2 is located in the evaporator 1.

Further, the flue gas generating unit includes a heating furnace, a stainless steel asphalt cylinder, a gas input pipe and a gas output pipe, the stainless steel asphalt cylinder is located above the heating furnace, a stopper is provided on the stainless steel asphalt cylinder, and one end of the gas input pipe passes through a pipe connector Connect with the dry heat air supply unit, the other end goes through the plug and extends into the stainless steel asphalt tank, one end of the gas output pipe goes through the plug into the stainless steel asphalt tank, the part of the gas input pipe extending into the stainless steel asphalt tank is larger than the part of the gas output pipe extending into the stainless steel The part of the asphalt cylinder is long.

Further, the flue gas component capturing unit includes evaporator 2, a first flue gas filter, condenser 2, a second flue gas filter and a third flue gas filter, the first flue gas filter is located in the evaporator In the second, the third flue gas filter is located in the second condenser. One end of the first flue gas filter is connected to the gas output pipe of the flue gas generating unit through a pipe connector, and the other end is connected to the second flue gas filter through a pipe connector. One end of the smoke filter is connected, and one end of the second smoke filter is connected with one end of the third smoke filter through a pipe connector.

Further, the first flue gas filter, the second flue gas filter and the third flue gas filter all include a stainless steel casing 1, and the two ends of the stainless steel casing 1 are respectively provided with a flue gas input plug 1 and a flue gas output plug 1. The stainless steel shell is filled with porous ceramic particles.

Further, the flue gas purification unit includes an air extraction pump and a flue gas purifier, one end of the air extraction pump is connected to the flue gas component capture unit through a pipeline, a second flow meter is provided on the pipeline, and the other end is connected to the flue gas component through a pipeline connector. One end of the air purifier is connected.

Further, the flue gas purifier includes a stainless steel casing 2, the two ends of the stainless steel casing 2 are respectively provided with a flue gas input plug 2 and a flue gas output plug 2, and the stainless steel casing 2 is filled with activated carbon.

A method for detecting and testing hot-mix asphalt smoke by using a bitumen smoke component capture device, comprising the following steps:

Step 1. Open the air valve and air pump in turn to conduct a pre-test for the test, and observe the gas flow results through the first flowmeter and the second flowmeter to ensure that the gas in the test device is unobstructed and has good sealing;

Step 2. In order to study the influence of air components on the generation of asphalt fume, control different gas components by controlling the gas components of the gas tank, and set three gas components for detection;

Step 3. In order to study the influence of air flow on the generation of asphalt fume, control different gas flows by controlling the air valve, the first flow meter, the second flow meter and the suction pump, and set the three flow rates of the gas flow for detection;

Step 4. In order to study the flue gas of different production processes and stages of asphalt heating, mixing and modification, three temperature and time intervals of the heating furnace are set for detection;

Step 5. In order to observe the dissipation of asphalt flue gas at different temperatures, set the temperature of the second and third groups of evaporator and condenser to capture the components of the flue gas;

Step 6. Turn off the dry heat supply unit, the flue gas generating unit, the flue gas component capture unit and the flue gas purification unit in turn, and then turn off the first flue gas filter, the second flue gas filter and the third flue gas filter Separating, taking out the porous ceramic particles in the first flue gas filter, the second flue gas filter and the third flue gas filter respectively in turn, and placing the porous ceramic particles in trichlorethylene to separate out the bitumen flue gas, and finally obtain Capture amount of different components of bitumen flue gas.

The beneficial effects of the present invention are as follows:

1. A flue gas component capture device and testing method proposed by the present invention can not only control the influence of air components on the generation of asphalt fume, but also quantitatively control the influence of air flow on the generation of asphalt fume;

2. A flue gas component capture device and testing method proposed in the present invention can capture bitumen flue gas components in groups, and can obtain bitumen flue gas components more efficiently and reasonably, providing better support for bitumen production and scientific research;

3. A flue gas component capture device and testing method proposed in the present invention finally purifies the remaining flue gas by means of chemical purification, which can deal with the flue gas pollution generated in the asphalt production and modification process more environmentally friendly.

Description of drawings

Fig. 1 is the overall structure schematic diagram of the asphalt fume component capturing device of the present invention;

Fig. 2 is a structural schematic diagram of a first flue gas filter, a second flue gas filter or a third flue gas filter;

Fig. 3 is the structural representation of flue gas purifier;

Among them: 1-dry heat supply unit; 2-flue gas generating unit; 3-flue gas component capture unit; 4-flue gas purification unit; 1-1-gas tank; 1-2-gas valve; 1-3 -First flowmeter; 1-4-pipe connector; 1-5 condenser one; 1-6-heat pipe one; 1-7-heat pipe two; 1-8-evaporator one; 2-1-heating Furnace; 2-2-stainless steel asphalt cylinder; 2-3-asphalt; 2-4-plug; 2-5-gas input pipe; 2-6-gas output pipe; 3-1-evaporator two; 3-2- The first flue gas filter; 3-3 the second flue gas filter; 3-4- condenser two; 3-5- the third flue gas filter; 4-1- the second flow meter; 4-2- pumping Air pump; 4-3-flue gas purifier; 3-3-1-stainless steel shell one; 3-3-2-flue gas input plug one; 3-3-3-flue gas output plug one;3-3-4 -Porous ceramic particles; 4-3-1-Stainless steel shell two; 4-3-2-Smoke input plug two; 4-3-3-Smoke output plug two; 4-3-4-Activated carbon.

detailed description

The present invention will be further described in conjunction with the accompanying drawings.

Specific embodiment one: as shown in Figure 1, an asphalt fume component capture device includes a dry heat supply unit 1, a flue gas generation unit 2, a flue gas component capture unit 3 and a flue gas purification unit 4, the The end of the dry heat supply unit 1 is connected to the head end of the flue gas generation unit 2 through a pipe, and provides dry heat oxygen for the thermal oxygen aging of the asphalt hot mixing process; the end of the flue gas generation unit 2 is connected to the flue gas component capture unit 3 through a pipe The head end is connected to accurately obtain different specific gravity components of the flue gas; the end of the flue gas component capture unit 3 is connected to the head end of the flue gas purification unit 4 through pipes to obtain the flow rate after the flue gas is captured, and further purify the flue gas of hot mix asphalt .

Embodiment 2: The dry heat air supply unit 1 includes an air tank 1-1, an air valve 1-2, a first flow meter 1-3, a pipeline connector 1-4, a condenser 1-5, and a heat pipe One 1-6, heat pipe two 1-7, evaporator one 1-8. The air tank 1-1 controls the outflow of air through the air valve 1-2, and obtains air at a certain flow rate through the first flow meter 1-3, and the end of the first flow meter 1-3 is connected to the heat pipe 1-6 through the pipe connector Connect, and condense the gas in condenser one 1-5, the end of heat pipe one 1-6 is connected to heat pipe two 1-7 by a pipe connector, and the gas is heated through evaporator one 1-8.

The smoke generating unit 2 can ensure that the bitumen undergoes thermo-oxidative reaction and generates smoke under the action of certain air input.

The smoke component capturing unit 3 can capture different components of the smoke.

The flue gas purification unit 4 can purify the remaining part of asphalt flue gas.

The air tank 1-1 can provide air with different gas components, and provide an external gas environment for heating asphalt to generate flue gas.

The condenser one 1-5 and the evaporator one 1-8 can provide dry air at different temperatures, and provide different heat source gases for the generation of asphalt flue gas.

Other components and connections are the same as those in the first embodiment.

Specific embodiment three: As shown in Figure 1, the flue gas generating unit 2 includes a heating furnace 2-1, a stainless steel asphalt cylinder 2-2, asphalt 2-3, a plug 2-4, a gas input pipe 2-5, a gas Output pipes 2-6. The stainless steel asphalt tank 2-2 is filled with asphalt 2-3 and covered with a plug 2-4 to form an airtight asphalt storage. The plug 2-4 is connected to the input pipe 2-5 and the gas output pipe 2-6 to ensure that the gas can be input. Output, the gas input pipe 2-5 is connected to the dry heat gas supply unit 1 through a pipe connector to provide hot oxygen aging gas for the asphalt 2-3 in the stainless steel asphalt tank 2-2, and the end of the gas output pipe 2-6 is connected to the Pipe connector connection.

The heating furnace 2-1 can provide different temperature heat sources for the hot gas generator, and provide heat sources for different asphalt production processes.

The other components and connections are the same as those in Embodiment 1 or Mode 2.

Embodiment 4: The flue gas component capture unit 3 includes a pipe connector, an evaporator 2 3-1, a first flue gas filter 3-2, a second flue gas filter 3-3, and a condenser 2 3 -4. The third flue gas filter 3-5. The second evaporator 3-1 is connected to the pipe connector and the first smoke filter 3-2, the first smoke filter 3-2 and the second smoke filter 3-3 are connected to each other through the pipe and the pipe connector, and the second The first flue gas filter 3-2 is placed in the evaporator 2 3-1, the second flue gas filter 3-3 and the third flue gas filter 3-5 are connected to each other with pipes and pipe connectors, and the third flue gas filter Device 3-5 is placed among condenser two 3-4, and is connected with pipeline connector.

The first flue gas filter 3-2, the second flue gas filter 3-3 and the third flue gas filter 3-5 contain porous ceramic particles inside, which are used for asphalt fume capture and collection.

The second evaporator 3-1 and the second condenser 3-4 can provide different ambient temperatures for the first flue gas filter 3-2 and the third flue gas filter 3-5 respectively, so as to ensure that the asphalt flue gas components are at Captured at different ambient temperatures.

The other components and connections are the same as those in the first embodiment or the second or the third embodiment.

Fifth specific embodiment: the flue gas purification unit 4 includes a second flow meter 4-1, an air suction pump 4-2, and a flue gas purifier 4-3. The second flow meter 4-1, the suction pump 4-2, and the flue gas purifier 4-3 are connected through a pipe connector.

The air extraction pump 4-2, the second flow meter 4-1 combined with the gas tank 1-1, the gas valve 1-2, and the first flow meter 1-3 can provide the air gas with different flow rates for the smoke generating unit 2, For asphalt fume generation under different airflows.

The flue gas purifier 4-3 contains activated carbon to purify the remaining exhaust gas and ensure that the asphalt flue gas does not pollute the outside world.

The other components and connections are the same as those in the specific embodiment 1, mode 2, mode 3 or mode 4.

Specific Embodiment Six: This embodiment is described in conjunction with Fig. 1 to Fig. 2. A method for capturing asphalt fume components described in this embodiment includes the following steps:

Step 1. Open the gas valve 1-2 and air pump 4-2 in turn to conduct a pre-test for the test, and observe the gas flow results through the first flow meter 1-3 and the second flow meter 4-1 to ensure that the gas in the test device Unobstructed and with good sealing;

Step 2. In order to study the influence of air components on the generation of asphalt fume, different gas components are controlled by controlling the gas components of the gas tank 1-1, and three gas components are set for detection, as shown in Table 1 for details;

Table 1 Effect of air components on asphalt fume generation and capture parameters

Step 3. In order to study the influence of air flow on the generation of asphalt fume, control different gas flows through the gas control valve 1-2, the first flow meter 1-3, the second flow meter 4-1 and the air pump 4-2 , set the gas flow rate to three flow rates for detection, see Table 2 for details;

Table 2 Air flow parameter table

Step 4. In order to study the flue gas of different production processes and stages such as asphalt heating, mixing and modification, set three temperature and time intervals of heating furnace 2-1 for detection, set three groups of temperature intervals and their length, see for details table 3;

Table 3 Temperature parameters of asphalt flue gas

Step 5. In order to observe the dissipation of asphalt flue gas at different temperatures, set the ambient temperature of the evaporator 2 3-1 and the condenser 2 3-4 to capture the components of the flue gas. The capture ambient temperature table is shown in the table 4.

Table 4. Environmental temperature parameters for asphalt fume capture

Step 6. Turn off the dry heat supply unit 1, the flue gas generating unit 2, the flue gas component capture unit 3 and the flue gas purification unit 4 in sequence, and then put the first flue gas filter 3-2, the second flue gas filter 3-3 and the third flue gas filter 3-5 are separated, and the first flue gas filter 3-2, the second flue gas filter 3-3 and the third flue gas filter 3-5 are respectively taken out successively. Porous ceramic particles 3-3-4, and the porous ceramic particles 3-3-4 are placed in trichlorethylene to precipitate asphalt fume, and finally obtain the capture amount of different components of asphalt fume.

The above description is only a preferred embodiment of the present invention, and does not limit the present invention in any form. Although the present invention has been disclosed as above with preferred implementation cases, it is not intended to limit the content of the present invention. Anyone familiar with this field Those skilled in the art, without departing from the scope of the technical solution of the present invention, when they can use the technical content disclosed above to make some changes and modifications are regarded as equivalent embodiments of the equivalent changes of the present invention, according to the technical solution of the present invention and its inventive concept Any equivalent replacement or change shall fall within the protection scope of the present invention.

Claims (8)

1. An asphalt flue gas component capture device, characterized in that it includes a dry heat supply unit (1), a flue gas generation unit (2), a flue gas component capture unit (3) and a flue gas purification unit (4 ), the end of the dry heat supply unit (1) is connected to the head end of the flue gas generation unit (2) through a pipe, and the end of the flue gas generation unit (2) is connected to the flue gas component capture unit (3) through a pipe The head end of the flue gas component capture unit (3) is connected to the head end of the flue gas purification unit (4) through a pipe. 2. The asphalt fume component capture device according to claim 1, characterized in that: the dry heat air supply unit (1) includes an air tank (1-1), a condenser (1-5) , heat pipe one (1-6), heat pipe two (1-7) and evaporator one (1-8), the outlet of the gas tank (1-1) passes through the pipe and one end of heat pipe one (1-6) connection, the pipeline is provided with an air valve (1-2), a first flow meter (1-3) and a pipeline connector (1-4), and the other end of the heat pipe one (1-6) is connected to the heat conduction pipe through the pipeline connector One end of the second pipe (1-7) is connected, the first heat pipe (1-6) is located in the first condenser (1-5), and the second heat pipe (1-7) is located in the first evaporator (1-8). 3. A device for capturing asphalt fume components according to claim 2, characterized in that: the flue gas generating unit (2) includes a heating furnace (2-1), a stainless steel asphalt tank (2-2), Gas input pipe (2-5) and gas output pipe (2-6), the stainless steel asphalt tank (2-2) is located above the heating furnace (2-1), and the stainless steel asphalt tank (2-2) is provided with a plug (2 -4), one end of the gas input pipe (2-5) is connected to the dry heat supply unit (1) through a pipe connector, and the other end is inserted into the stainless steel asphalt tank (2-2) through the plug (2-4), One end of the gas output pipe (2-6) goes through the plug (2-4) and extends into the stainless steel asphalt cylinder (2-2), and the gas input pipe (2-5) extends into the stainless steel asphalt cylinder (2-2) The gas output pipe (2-6) stretches into the part length of the stainless steel asphalt tank (2-2). 4. An asphalt smoke component capture device according to claim 3, characterized in that: the smoke component capture unit (3) includes evaporator two (3-1), a first smoke filter (3-2), condenser two (3-4), second flue gas filter (3-3) and third flue gas filter (3-5), first flue gas filter (3-2) Located in the second evaporator (3-1), the third flue gas filter (3-5) is located in the second condenser (3-4), and one end of the first flue gas filter (3-2) passes through the pipe connector It is connected to the gas output pipe (2-6) of the flue gas generating unit (2), and the other end is connected to one end of the second flue gas filter (3-3) through a pipe connector, and the second flue gas filter (3-3) One end of 3) is connected with one end of the third flue gas filter (3-5) through a pipe connector. 5. A device for capturing asphalt smoke components according to claim 4, characterized in that: the first smoke filter (3-2), the second smoke filter (3-3) and the second smoke filter The three flue gas filters (3-5) all include stainless steel casing one (3-3-1), and the two ends of the stainless steel casing one (3-3-1) are respectively provided with flue gas input plugs one (3-3-2 ) and flue gas output plug one (3-3-3), and the stainless steel shell one (3-3-1) is filled with porous ceramic particles (3-3-4). 6. The asphalt fume component capture device according to claim 5, characterized in that: the flue gas purification unit (4) includes an air pump (4-2) and a flue gas purifier (4-3) , one end of the exhaust pump (4-2) is connected to the flue gas component capture unit (3) through a pipeline, the second flow meter (4-1) is installed on the pipeline, and the other end is connected to the flue gas purifier ( 4-3) One end connection. 7. A device for capturing asphalt fume components according to claim 6, characterized in that: the flue gas purifier (4-3) includes a stainless steel shell two (4-3-1), a stainless steel shell two ( The two ends of 4-3-1) are respectively equipped with smoke input plug 2 (4-3-2) and smoke output plug 2 (4-3-3), and the stainless steel shell 2 (4-3-1) is filled Activated carbon (4-3-4). 8. A method for hot-mix asphalt fume detection and testing utilizing the asphalt fume component capture device as claimed in any one of claims 1-7, characterized in that: comprising the steps of: Step 1. Open the gas valve (1-2) and air pump (4-2) in turn to conduct a pre-test for the test, and observe the gas flow through the first flow meter (1-3) and the second flow meter (4-1) As a result, ensure that the gas in the test device is unobstructed and has good sealing; Step 2. In order to study the influence of air components on the generation of asphalt fume, control different gas components by controlling the gas components of the gas tank (1-1), and set three gas components for detection; Step 3. In order to study the influence of air flow rate on asphalt fume generation, by controlling the air valve (1-2), the first flow meter (1-3), the second flow meter (4-1) and the air pump (4- 2), control different gas flow rates, set the gas flow rate to three flow rates for detection; Step 4. In order to study the flue gas in different production processes and stages of asphalt heating, mixing and modification, set three temperature and time intervals of the heating furnace (2-1) for testing; Step 5. In order to observe the dissipation of asphalt flue gas at different temperatures, set three sets of temperatures in the evaporator 2 (3-1) and condenser 2 (3-4) to capture the components of the flue gas; Step 6. Turn off the dry heat supply unit (1), the flue gas generating unit (2), the flue gas component capture unit (3) and the flue gas purification unit (4), and then put the first flue gas filter (3 -2), the second flue gas filter (3-3) and the third flue gas filter (3-5) are separated, and the first flue gas filter (3-2) and the second flue gas filter are taken out in turn The porous ceramic particles (3-3-4) in the device (3-3) and the third flue gas filter (3-5), and the porous ceramic particles (3-3-4) are placed in trichlorethylene The asphalt fume is precipitated, and finally the capture amount of different components of the asphalt fume is obtained.

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