Asphalt flue gas purification device for laboratory

Abstract

The utility model relates to an asphalt flue gas purification device for a laboratory, and belongs to the technical field of flue gas purification. The device comprises a carrier gas device, an asphalt smoke discharging device, an aluminum oxide adsorption and purification device and a lime water purification device, the outlet end of the carrier gas device is communicated with a carrier gas inlet of the asphalt smoke discharging device through a carrier gas inlet pipe, and a smoke outlet of the asphalt smoke discharging device is communicated with the smoke inlet end of the aluminum oxide adsorption and purification device through a smoke conveying pipe I; the flue gas outlet end of the aluminum oxide adsorption purification device is communicated with the lime water purification device through a flue gas conveying pipe II, and the lime water purification device is emptied through a tail gas pipe. The device is simple in structure and high in purification efficiency, facilitates asphalt flue gas purification experiments in laboratories, does not cause pollution, and can be used for solving the problem of asphalt flue gas pollution in the continuous anode preparation process.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of asphalt flue gas purification devices for laboratory, belong to flue gas purification technical field. BACKGROUND

[0002] A large amount of harmful asphalt smoke dust is generated in the asphalt processing process, which is composed of polycyclic aromatic hydrocarbons, containing light boiling hydrocarbons and strong carcinogens. The asphalt smoke has gas-liquid two-phase characteristics, with a wide particle size distribution range from 0.01 microns to 10 microns. This characteristic makes it difficult to effectively treat with conventional purification methods. The main purification methods currently include absorption, incineration, adsorption and electrostatic collection. Although the absorption method can remove some toxic components, it has the problem of difficult regeneration of the absorbent. Although the incineration method has good purification effect, it has high energy consumption and may cause secondary pollution. The electrostatic collection method has complex equipment and high maintenance cost. Although the adsorption method is simple to operate, the adsorption efficiency of traditional adsorbents such as coke powder is limited and easy to saturate. In particular, in the laboratory environment, a purification device that can efficiently purify asphalt flue gas, is simple to operate and safe and reliable is needed, and temperature control and multi-stage purification during flue gas transportation also need to be considered. The existing technology cannot meet these requirements at the same time, and improvement is needed. SUMMARY

[0003] To solve the problems of low asphalt flue gas purification efficiency and incomplete treatment in the existing laboratory environment, the present application provides an asphalt flue gas purification device for laboratory, which transports inert carrier gas through a carrier gas device, realizes efficient treatment of asphalt flue gas by combining a multi-stage purification device, effectively removes harmful substances by using alumina adsorbent and lime water double purification mechanism, and has the advantages of efficient purification of asphalt flue gas, simple operation and safety and reliability.

[0004] The utility model adopts the technical scheme to solve its technical problem:

[0005] An asphalt flue gas purification device for laboratory includes a carrier gas device 1, an asphalt smoke outlet device, an alumina adsorption purification device and a lime water purification device 8. The outlet end of the carrier gas device 1 is connected to the carrier gas inlet of the asphalt smoke outlet device through a carrier gas inlet pipe. The flue gas outlet of the asphalt smoke outlet device is connected to the flue gas inlet end of the alumina adsorption purification device through a flue gas conveying pipe I. The flue gas outlet end of the alumina adsorption purification device is connected to the lime water purification device 8 through a flue gas conveying pipe II 5. The lime water purification device 8 is emptied through a tail gas pipe.

[0006] The device adopts a multi-stage cooperative purification mechanism, drives the flue gas flow through a carrier gas device, and combines the dual purification paths of alumina adsorption and lime water absorption. The carrier gas device delivers inert gas to the asphalt smoke outlet device, which controls the asphalt pyrolysis environment and carries the flue gas into the subsequent processing unit; the asphalt smoke outlet device generates asphalt flue gas containing gas and liquid phases in a sealed environment to avoid pollutant diffusion; the flue gas conveying pipe I directs the mixed flue gas to the alumina adsorption purification device, which removes organic components using the adsorption properties of alumina for gas phase pollutants; the flue gas after adsorption treatment is introduced into the lime water purification device through the flue gas conveying pipe II, and the residual acidic substances are eliminated through acid-base neutralization reaction; the tail gas pipe discharges the finally purified gas at high altitude. Through the process combination of carrier gas driving, adsorption purification and chemical absorption, a gradient treatment system for laboratory asphalt flue gas characteristics is formed, overcoming the defects of incomplete treatment of complex components by single purification method.

[0007] Preferably, the asphalt smoke outlet device includes a heating furnace 2, a sealed heating container 3 placed in the center of the heating zone of the heating furnace 2, the sealed heating container 3 is filled with asphalt, and the carrier gas inlet and flue gas outlet are opened on the top cover of the sealed heating container 3. Through the combination structure of heating furnace and sealed heating container, the asphalt is heated in a controlled sealed environment. The sealed heating container is precisely placed in the center of the heating zone of the heating furnace to ensure uniform heating of the asphalt and stable temperature field, avoiding unstable flue gas generation due to local temperature deviation. Through the physical isolation of the sealed container, it can not only prevent the unorganized escape of asphalt flue gas during heating, but also create a closed channel for the directional flow of carrier gas and flue gas. The carrier gas inlet and flue gas outlet on the top cover form a gas flow path, the carrier gas is injected from the inlet and fully mixed with the volatilized asphalt flue gas, and the mixed gas is directed out through the pre-set flue gas outlet, providing controllable conveying conditions for subsequent multi-stage purification treatment. The asphalt flue gas is dynamically mixed in the sealed heating container, which facilitates the measurement of the component concentration of the asphalt flue gas and enables better contact between the asphalt flue gas and the adsorbent.

[0008] More preferably, the carrier gas inlet pipe is inserted into the middle part of the sealed heating container 3 through the carrier gas inlet of the top cover of the sealed heating container 3. By extending the carrier gas inlet pipe to the middle part of the sealed heating container, the carrier gas is injected from the center of the container, which can enhance the contact area between the carrier gas and the molten asphalt. This design optimizes the carrier gas flow path, avoiding the phenomenon of short-distance diffusion of carrier gas only at the top of the container, so that the carrier gas can more fully carry the volatilized asphalt flue gas, thereby improving the flue gas collection efficiency. The feature of "inserting into the middle part of the sealed heating container" limits the depth range of the carrier gas inlet, dynamically mixes the asphalt flue gas, and ensures more uniform flow field distribution of the carrier gas inside the container, avoiding local excessive or insufficient gas flow leading to asphalt smoke escape.

[0009] Preferably, the outer side of the flue gas conveying pipe I is covered with a heat preservation sleeve 4. By setting a heat preservation sleeve on the outer side of the flue gas conveying pipe I, the heat exchange between the flue gas and the external environment during the conveying process can be effectively reduced, and the high temperature state of the asphalt flue gas can be maintained. The design of the heat preservation sleeve covering the outer side of the pipe makes it difficult for heat to be lost, avoiding the liquefaction and condensation of gaseous asphalt components in the flue gas due to temperature drop, thereby ensuring the adsorption efficiency of the subsequent aluminum oxide adsorption purification device for gaseous pollutants. This technical means, aiming at the phase characteristics of asphalt flue gas, realizes temperature control through physical isolation, ensuring the continuity and stability of the purification system operation.

[0010] More preferably, the heat preservation sleeve 4 is of a flexible structure, and the inner layer of the heat preservation sleeve 4 is attached to the outer side wall of the flue gas conveying pipe I. By setting a heat preservation sleeve with a flexible structure, the heat preservation sleeve can adapt to the surface shape changes of the flue gas conveying pipe with different diameters or bending shapes, avoiding the existence of gaps between the traditional rigid heat preservation layer and the pipe wall, which leads to a decrease in heat preservation effect. In particular, the direct attachment design of the inner layer of the heat preservation sleeve and the pipe wall forms a continuous and uniform heat preservation layer through physical contact conduction, which not only solves the problem of local heat dissipation caused by installation gaps in traditional heat preservation layers, but also eliminates the risk of cracking of the heat preservation layer caused by thermal expansion and contraction of the pipe through the deformation compensation ability of the flexible structure, ensuring that the asphalt flue gas maintains a stable temperature environment during the conveying process, preventing the condensation of gaseous components into liquid phase due to temperature drop, and ensuring the adsorption efficiency of the subsequent aluminum oxide adsorbent for gaseous pollutants.

[0011] More preferably, the heat preservation sleeve 4 is uniformly provided with heating resistance wires, the heating resistance wires are connected to a power supply, and the flue gas outlet end of the flue gas conveying pipe I is provided with a digital thermometer. Through the uniformly distributed heating resistance wires inside the heat preservation sleeve, the flue gas conveying pipe is actively heated, ensuring the stability of the flue gas temperature during the conveying process, avoiding the condensation of liquid phase components in the asphalt flue gas due to temperature drop, and affecting the performance of the subsequent adsorbent. The design of the heating resistance wires connected to an independent power supply allows the heating power to be flexibly adjusted according to actual needs, enhancing the temperature control adaptability. The digital thermometer at the flue gas outlet end can monitor the temperature change of the flue gas in real time, allowing the operator to accurately control the heating intensity, forming a closed-loop temperature management, thereby maintaining the optimal adsorption temperature conditions of the aluminum oxide adsorbent and ensuring the stability of the purification device operation.

[0012] Preferably, the alumina adsorption purification device comprises a water bath heating device 6 and an adsorption purification pipe 7, the adsorption purification pipe 7 is vertically fixedly arranged in the water bath heating device 6, the adsorption purification pipe 7 is filled with alumina adsorbent, the opening end of the adsorption purification pipe 7 is a flue gas inlet end and a flue gas outlet end respectively, the flue gas inlet end and the flue gas outlet end are located directly above the water bath heating device 6, the flue gas outlet end of the flue gas conveying pipe I is in communication with the flue gas inlet end of the adsorption purification pipe 7, and the flue gas outlet end of the adsorption purification pipe 7 is in communication with the flue gas inlet end of the flue gas conveying pipe II 5. By setting the water bath heating device, a constant temperature environment is provided for the adsorption purification pipe, so as to avoid the decrease of adsorption capacity of the alumina adsorbent due to temperature fluctuation, and at the same time, the structure of vertically fixing the adsorption purification pipe is adopted, so that the flue gas forms a stable upward airflow in the pipe, and the contact time with the alumina adsorbent is prolonged; the flue gas inlet end and the outlet end are arranged directly above the water bath heating device, which not only prevents the water bath medium from penetrating into the pipeline, but also enhances the gas-solid two-phase mass transfer efficiency through the temperature difference; the continuous pipe type structure is adopted to connect the flue gas conveying pipes I and II, so as to ensure uninterrupted operation of the purification process and avoid the problem of frequent replacement of adsorbent required by the traditional intermittent adsorption device; the alumina is selected as the adsorbent filler, and the porous characteristics thereof are utilized to have physical adsorption with the gas-liquid phase components in the bitumen flue gas, and the constant temperature condition is combined to maintain the stability of the adsorbent activity.

[0013] More preferably, the adsorption purification pipe 7 is a U-shaped purification pipe or a ring-shaped purification pipe. By designing the adsorption purification pipe as a U-shaped or ring-shaped structure, the contact area and reaction time of the alumina adsorbent and the bitumen flue gas can be significantly increased. The curved path of the U-shaped purification pipe forces the flue gas to flow in the pipe for multiple times, prolongs the contact time of the flue gas and the adsorbent, and enhances the physical adsorption effect; the closed circulation structure of the ring-shaped purification pipe causes the flue gas to form a vortex effect in the ring-shaped space, thereby increasing the utilization rate of the adsorbent surface area. These two specific pipe type structures can overcome the problems of too fast flue gas passing speed and insufficient adsorption existing in the traditional straight pipe structure, and at the same time, avoid the local adsorbent saturation failure phenomenon caused by uneven airflow distribution, so as to improve the adsorption efficiency and operation stability of the overall purification device.

[0014] Preferably, the lime water purification device 8 is filled with lime water, the cover of the lime water purification device 8 is provided with an air inlet through hole and an air outlet through hole, the flue gas outlet end of the flue gas conveying pipe II 5 penetrates through the air inlet through hole of the cover and extends to the bottom of the lime water purification device 8, the air inlet end of the tail gas pipe penetrates through the air outlet through hole of the cover and extends to the top of the lime water purification device 8, and the air inlet end of the tail gas pipe is located above the liquid level of the lime water. The gas-liquid efficient contact is realized by arranging the double through hole cover and the pipeline extension structure. The flue gas conveying pipe is extended to the bottom of the device, so that the flue gas slowly rises from the bottom of the lime water in the form of bubbles, the gas-liquid contact time is prolonged, the flue gas is fully dispersed, the chemical neutralization efficiency of the lime water on the acidic substances in the flue gas is improved, the air inlet end of the tail gas pipe is located above the liquid level, the gas-liquid separation space is formed, the liquid droplets carried by the purified gas are avoided, and the gas unidirectional flow path is established by using the liquid level difference.

[0015] Preferably, the carrier gas device 1 is a nitrogen cylinder or an argon cylinder. By adopting the nitrogen cylinder or the argon cylinder as the carrier gas source, the chemical inert characteristics of nitrogen and argon are utilized, and the reaction of the carrier gas with active substances such as polycyclic aromatic hydrocarbons and light boiling hydrocarbons in the asphalt flue gas is avoided. Specifically, the non-active carrier gas nitrogen can isolate the oxygen environment to prevent the oxidation of asphalt components at high temperature to generate secondary pollutants, and the rare gas argon can completely eliminate the interaction risk of the carrier gas and the flue gas components. Both kinds of gases can stably maintain the chemical environment of the flue gas conveying process, which not only avoids the combustion explosion hidden danger that may be caused by the traditional air carrier gas, but also guarantees the purification effect of the subsequent alumina adsorption and lime water absorption process.

[0016] The laboratory asphalt flue gas purification device has the advantages that:

[0017] (1) The laboratory asphalt flue gas purification device can solve the problems of low purification efficiency and incomplete treatment of asphalt flue gas in a laboratory environment, especially for the difficulty that dispersed pollutants in gas-liquid two-phase mixture are difficult to be effectively removed by conventional methods.

[0018] (2) The laboratory asphalt flue gas purification device transports inert gas through a carrier gas device, realizes efficient treatment of asphalt flue gas in combination with a multi-stage purification device, effectively removes harmful substances by using an alumina adsorbent and a lime water double purification mechanism, and has the advantages of efficient purification of asphalt flue gas, simple operation, safety and reliability. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is a laboratory asphalt flue gas purification device structure schematic view.

[0020] In the figure, the carrier gas device 1, heating furnace 2, sealed heating container 3, heat preservation sleeve 4, flue gas conveying pipe II 5, water bath heating device 6, adsorption purification pipe 7, lime water purification device 8. DETAILED DESCRIPTION

[0021] The technical solutions in the present application will be described clearly and completely below in combination with the drawings in the present application. Obviously, the described embodiments are only some of the embodiments of the present application, not all the embodiments. The components of the present application described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0022] In the prior art, the field of asphalt flue gas purification has long been faced with the problem of insufficient treatment efficiency of gas-liquid two-phase pollutants. In the traditional method, the absorption method has the problem of difficult regeneration of the absorbent, the incineration method requires a high-temperature environment, resulting in high energy consumption, the adsorption method has limited liquid-phase particle interception effect, and the electric capture method has the defects of complex equipment and high operating cost. The laboratory environment requires higher purification efficiency and operational safety, but the existing single purification method cannot achieve the simultaneous removal of gas-liquid two-phase pollutants, and residual pollutants can easily cause secondary pollution.

[0023] In order to solve the above problems, it is found in the research and development process that the laboratory asphalt smoke contains mixed pollutants of gaseous organic matter and liquid particles, and a multi-stage treatment system needs to be established. By analyzing the physical and chemical properties of gaseous pollutants and liquid particles, considering the adsorption capacity of aluminum oxide for organic matter and the neutralization effect of lime water, a purification path of adsorption and absorption cooperation is constructed. Further optimize the connection mode of the device, use carrier gas to drive to form a continuous treatment process, and avoid the condensation and retention of pollutants in the conveying process.

[0024] As Figure 1As shown, the present application proposes a laboratory asphalt flue gas purification device, which comprises a carrier gas device 1, an asphalt smoke device, an alumina adsorption purification device and a lime water purification device 8. The outlet end of the carrier gas device 1 is communicated with the carrier gas inlet of the asphalt smoke device through a carrier gas inlet pipe. The flue gas outlet of the asphalt smoke device is communicated with the flue gas inlet end of the alumina adsorption purification device through a flue gas conveying pipe I. The flue gas outlet end of the alumina adsorption purification device is communicated with the lime water purification device 8 through a flue gas conveying pipe II 5. The lime water purification device 8 is emptied through a tail gas pipe. The carrier gas device refers to the gas source for providing inert gas to push the directional flow of flue gas, which can be realized by a high-pressure gas cylinder. The flue gas treatment speed is controlled by adjusting the gas flow. The asphalt smoke device refers to the equipment for generating asphalt flue gas under airtight conditions, which can be a container with heating function. The airtight structure prevents the leakage of pollutants. The alumina adsorption purification device refers to a container filled with alumina particles, which can be a vertically arranged tubular structure. The porous characteristics of alumina are used to adsorb gaseous organic pollutants. The lime water purification device refers to a container filled with alkaline solution, which can be a reactor with a gas inlet diffusion pipe. The residual acidic substances are eliminated by acid-base neutralization.

[0025] The carrier gas device delivers inert gas into the asphalt smoke device to dynamically mix the asphalt flue gas, which facilitates the measurement of the asphalt flue gas concentration and enables better contact between the asphalt flue gas and the adsorbent. The generated asphalt flue gas carried by the inert carrier gas enters the alumina adsorption purification device. The alumina adsorbent preferentially captures gaseous organic pollutants, and then the flue gas enters the lime water purification device, where liquid particles react with alkaline solution. The tail gas is discharged through the exhaust pipe after two-stage treatment. This process uses the synergistic effect of adsorption and absorption to treat gaseous and liquid pollutants respectively. The carrier gas system ensures that the pollutants are in a controllable delivery state throughout the process. This device uses multiple treatment units in series to overcome the shortcomings of incomplete removal of mixed pollutants by single purification methods. The alumina adsorption and lime water absorption form a complementary mechanism. The former physically adsorbs organic components, and the latter treats acidic substances and untrapped particles. Compared with the traditional electric capture method, this scheme does not require a high-voltage electric field, reducing equipment complexity. Compared with the use of adsorbents alone, the double purification path significantly improves the removal rate of pollutants.

[0026] The present application can realize the simultaneous purification of asphalt flue gas in a laboratory environment, effectively preventing the residual of organic pollutants and acidic substances. The alumina adsorbent has selective adsorption effect on carcinogens such as benzopyrene, and the lime water neutralizes acidic gases such as sulfur dioxide. Two-stage treatment ensures that the exhaust gas meets safety standards. The closed carrier gas delivery system avoids leakage of pollutants during operation, ensuring the health of experimental personnel.

[0027] The asphalt smoke generating device further includes a heating furnace 2 and a sealed heating container 3. The sealed heating container 3 is placed in the center of the heating area of the heating furnace 2, and is filled with asphalt. A carrier gas inlet and a smoke outlet are formed on the top cover of the sealed heating container 3. The heating furnace refers to a device for providing a heat source, which can be realized by resistance heating or gas heating. The uniformity of the temperature distribution in the center of the heating area is ensured by the structure design of the furnace body. The sealed heating container refers to a high-temperature-resistant container with a closed cavity, which can be made of stainless steel or ceramic material. The top cover is sealed by flange or threaded connection. The smoke generated by the heated asphalt is confined in the sealed space. The carrier gas inlet refers to a gas injection channel arranged on the top cover, which can be realized by a tubular interface with a sealing ring. It is used to introduce inert gas to mix with the volatilized asphalt smoke. The smoke outlet refers to a gas outlet channel arranged on the top cover, which can be realized by a pipeline structure with a smaller diameter than the carrier gas inlet. The mixed gas flows directionally driven by pressure difference.

[0028] The sealed heating container is accurately placed in the core area of the heating field of the heating furnace, so that the outer wall and the heating element are equidistantly distributed, thereby forming a stable temperature gradient in the container. When the asphalt is heated and volatilized, the sealed structure forces the smoke to gather inside the container. After the carrier gas is injected through the inlet, a dynamic airflow is formed, which is fully mixed with the smoke and then directed out of the smoke outlet along the preset path. The double-channel design of the top cover forms a one-way gas flow path, avoiding the retention or disordered diffusion of smoke in the container. At the same time, the controllable output of the mixed gas concentration is realized by adjusting the external carrier gas flow.

[0029] The traditional laboratory asphalt heating device uses an open container or a local exhaust hood to collect smoke, which has the problems of high escape rate and low collection efficiency. The present scheme forms a closed smoke generation and collection environment during the heating process through the cooperation of the sealed container and the directional gas channel, avoiding external air interference and unorganized emission of smoke. The optimized design of the heating field of the heating furnace further ensures the stability of the asphalt volatilization process, providing a component-controllable smoke source for subsequent purification treatment. The present application realizes the full-sealed generation and directional export of asphalt smoke in the laboratory environment, solving the problem of smoke escape caused by open operation of the traditional device. The space limitation of the sealed heating container improves the smoke gathering efficiency, and the dynamic mixing process of the carrier gas and the smoke avoids the saturation of the adsorbent caused by the local high concentration, creating controllable input conditions for multi-stage purification treatment.

[0030] The application further proposes that the carrier gas inlet pipe passes through the carrier gas inlet of the top cover of the sealed heating container 3 and is inserted into the middle part of the sealed heating container 3. The insertion into the middle part of the sealed heating container means that the end of the carrier gas inlet pipe extends to the longitudinal center area inside the container, and a hard high-temperature-resistant metal pipe or a ceramic pipe can be used as the pipe material to achieve positioning by adjusting the length of the pipe. This design makes the carrier gas injection point avoid the top space and directly act on the molten asphalt area in the middle part of the container. Among them, the dynamic mixed asphalt fume refers to the gas flow path uniformly distributed from the center to the periphery formed by the diffusion of the carrier gas in the middle part of the container, which avoids the local area of the asphalt fume not being fully carried due to uneven gas flow distribution.

[0031] After the carrier gas is injected from the middle part of the sealed heating container, a ring-shaped diffusion gas flow is formed on the surface of the molten asphalt, covering a larger asphalt volatilization area. Since the carrier gas inlet is located in the middle part of the container, the gas flow can simultaneously escape upward and penetrate downward in the vertical direction, increasing the contact time with the asphalt. After the fume generated by the heated molten asphalt is wrapped by the carrier gas, it is discharged from the top fume outlet along the gas flow direction, avoiding the decrease in carrying efficiency caused by the short distance flow of the carrier gas on the surface layer when the traditional top gas inlet is used.

[0032] The conventional carrier gas injection method usually sets the gas inlet pipe at the top or sidewall of the sealed container, and the carrier gas directly enters the top space and quickly flows to the outlet, failing to fully contact the surface of the molten asphalt. The design of extending the gas inlet pipe to the middle part of the container makes the carrier gas flow path pass through the core area of asphalt volatilization, solving the problem of low asphalt fume carrying efficiency caused by uneven gas flow distribution and achieving effective coverage of the fume source. The application improves the flow field distribution of the carrier gas in the sealed container, so that the carrier gas can fully contact the fume volatilized from the surface of the molten asphalt, improving the fume carrying efficiency. At the same time, it avoids the phenomenon of asphalt fume escaping caused by excessive local gas flow, and improves the collection and treatment capacity of the subsequent purification device for fume.

[0033] The application further proposes that the outer side of the fume conveying pipe I is covered with a heat preservation sleeve 4. The heat preservation sleeve refers to a structure covering the outside of the fume conveying pipe I for reducing heat loss, which can be made of flexible material and attached to the outer wall of the pipe to achieve heat preservation by insulating the heat exchange between the external environment and the pipe. The fume conveying pipe I refers to the pipe structure connecting the asphalt fume outlet device and the alumina adsorption purification device, which is used to convey high-temperature asphalt fume inside, and the heat preservation sleeve can prevent heat loss.

[0034] The heat preservation sleeve is wrapped on the outer surface of the flue gas conveying pipe I, and the temperature drop rate of the flue gas is reduced by physical insulation. When the high-temperature asphalt flue gas flows in the pipe, the heat preservation sleeve reduces heat conduction and convection with the outside cold air, maintains the gas phase state of the flue gas, and avoids the condensation of gaseous components into liquid particles due to temperature reduction. Therefore, the flue gas entering the alumina adsorption purification device still maintains a gaseous state, ensuring the effective capture of pollutants by the adsorbent.

[0035] In the conventional technology, the conveying pipe lacks heat preservation measures, resulting in rapid temperature drop of the flue gas, condensation of gaseous asphalt into liquid droplets, and reduction of the adsorption efficiency of the alumina adsorbent to pollutants. The present application adds a heat preservation sleeve to achieve temperature control with a simple structure, without the need for additional heating equipment to maintain the stability of the physical state of the flue gas. The present application effectively prevents the temperature of the asphalt flue gas from dropping sharply during transportation due to heat dissipation, avoids the condensation of gaseous pollutants into liquid state and the separation from the gas phase system, thereby ensuring the processing effect of the alumina adsorption purification device and ensuring the continuous and stable operation of the entire purification system.

[0036] The present application further proposes that the heat preservation sleeve 4 is a flexible structure, and the inner layer of the heat preservation sleeve 4 is attached to the outer wall of the flue gas conveying pipe I. The flexible structure refers to a wrapping layer composed of a material that can undergo elastic deformation, which can be realized by using silicone, rubber or foamed polymer material. The inner layer is attached, which means that the heat preservation sleeve and the outer wall of the pipe form a gapless contact surface, which can be realized by using a hot melt adhesive layer or a vacuum adsorption process, thereby enhancing the heat conduction efficiency by eliminating air gaps.

[0037] The flexible structure of the heat preservation sleeve produces adaptive deformation when the pipe is heated and expanded, maintaining the integrity of the wrapping layer and avoiding the cracking or separation of traditional rigid insulation materials due to thermal stress. The inner layer is attached to form a continuous contact interface between the heat preservation sleeve and the outer wall of the pipe, and the heat is directly conducted to the outside of the heat preservation layer through material contact, reducing heat loss caused by air gaps. This structure can inhibit the temperature drop of asphalt flue gas during transportation, prevent the condensation of gaseous components into liquid particles due to temperature reduction, and ensure the adsorption activity of gaseous pollutants by subsequent alumina adsorbent.

[0038] Traditional heat preservation layers use hard materials to wrap pipes, which can easily cause gaps due to uneven pipe surfaces during installation, resulting in uneven local heat dissipation. When the pipe expands and contracts, the hard heat preservation layer cannot deform synchronously, and is prone to cracking or falling off. The present application uses flexible materials to dynamically attach to the pipe, eliminating gaps and compensating for deformation, achieving uniform and stable heat preservation effect. The present application effectively maintains the temperature stability of the flue gas conveying pipe, avoids the condensation of gaseous components in asphalt flue gas into liquid phase, ensures the adsorption efficiency of gaseous pollutants by alumina adsorbent, and solves the problem of gas-liquid two-phase separation caused by temperature fluctuation.

[0039] The application further proposes that the heating resistance wire is uniformly arranged in the heat preservation sleeve 4, the heating resistance wire is connected with the power supply, and the flue gas outlet end of the flue gas conveying pipe I is provided with a digital thermometer. The heating resistance wire refers to an electrically conductive element used to actively provide heat, which can be made of nickel-chromium alloy material or iron-chromium-aluminum alloy material into a spiral structure, which is uniformly distributed in the heat preservation sleeve to realize continuous heating of the flue gas conveying pipe, so as to avoid condensation of liquid components due to temperature drop of bitumen flue gas during conveying. The digital thermometer refers to a measuring device that can display temperature values in real time, which can use thermocouples or thermal resistors as temperature sensors, and intuitively feedback the temperature data of the flue gas outlet end through the digital display screen, so as to facilitate the operator to adjust the power of the heating resistance wire in time and maintain the stability of the flue gas temperature.

[0040] The heating resistance wire generates heat after being powered on, and the heat is uniformly transmitted to the flue gas conveying pipe through the heat preservation sleeve, so as to ensure that the temperature of the bitumen flue gas does not decrease significantly during conveying. The digital thermometer monitors the temperature of the flue gas outlet end in real time, and when the temperature is detected to be lower than the preset range, the power of the heating resistance wire can be adjusted; otherwise, the power is reduced, thereby forming a closed-loop temperature control mechanism, avoiding the liquid components in the bitumen flue gas from adhering to the inner wall of the pipeline due to condensation, and maintaining the optimal adsorption temperature condition of the subsequent alumina adsorbent.

[0041] The conventional heat preservation sleeve only slows down heat loss through thermal insulation materials, and cannot actively compensate for temperature loss, especially when the ambient temperature is low or the conveying distance is long. The scheme actively heats the heating resistance wire and combines the real-time feedback of the digital thermometer, which can dynamically adjust the heating power to ensure that the temperature is stable within the required range, overcoming the limitations of passive heat preservation. The temperature of the bitumen flue gas is stably controlled during conveying, avoiding the liquid components from adhering to the inner wall of the pipeline due to condensation, and ensuring that the subsequent alumina adsorbent is in an appropriate working temperature range, thereby improving the stability and continuity of the purification effect.

[0042] The application further proposes an alumina adsorption purification device, which comprises a water bath heating device 6 and an adsorption purification pipe 7. The adsorption purification pipe 7 is vertically fixed in the water bath heating device 6, the adsorption purification pipe 7 is filled with alumina adsorbent, the open end of the adsorption purification pipe 7 is a flue gas inlet end and a flue gas outlet end respectively, the flue gas inlet end and the flue gas outlet end are located directly above the water bath heating device 6, the flue gas outlet end of the flue gas conveying pipe I is in communication with the flue gas inlet end of the adsorption purification pipe 7, and the flue gas outlet end of the adsorption purification pipe 7 is in communication with the flue gas inlet end of the flue gas conveying pipe II 5. The water bath heating device refers to a constant temperature control device for transferring heat through a liquid medium, which can be realized by a closed circulating water tank, and the water temperature is maintained constant by an internal electric heater. The vertical fixation of the adsorption purification pipe refers to the longitudinal installation of the pipe body perpendicular to the ground, which can be realized by a flange fixing frame, and the airflow direction is optimized by gravity. The alumina adsorbent refers to a solid particulate material with a porous structure, which can be filled with γ-type alumina balls with a particle size range of 0.5-3mm, and the organic components in the flue gas are captured by physical adsorption. The flue gas inlet end and the outlet end are located directly above the water bath heating device, that is, the pipeline connection is kept at a safe distance from the water bath liquid surface, and a vertical spacing of at least 5-10cm can be provided to avoid liquid backflow.

[0043] The water bath heating device maintains the temperature of the liquid medium constant in a preset range, for example, in the range of 50-80℃, so that the adsorption purification pipe is in a constant temperature environment. When the asphalt-containing flue gas flows through the adsorption purification pipe, the alumina adsorbent keeps the pore structure open at a stable temperature, and the gas-liquid two-phase components in the flue gas are fully adsorbed. The vertical pipe body structure makes the flue gas flow from bottom to top, prolongs the contact path of the airflow and the adsorbent, and increases the flue gas residence time. The high arrangement of the inlet end and the outlet end forms a temperature difference gradient, the temperature of the flue gas is higher than the water bath temperature when it enters, and gradually cools down during the flow process, which promotes the migration of the gas phase components to the surface of the adsorbent. The continuous pipe structure avoids the operation of replacing the adsorbent required by the traditional adsorption tower, and realizes continuous operation by connecting multiple groups of adsorption purification pipes in parallel.

[0044] The conventional adsorption device is directly exposed to the ambient temperature, and the opening and closing state of the adsorbent pores is affected by the temperature fluctuation of the flue gas. For example, when the flue gas temperature is lower than 40℃, the adsorption capacity decreases due to the shrinkage of alumina pores. The existing method has a dead zone when using the adsorption tower structure, and part of the adsorbent cannot effectively contact the flue gas. The vertical pipe body structure realizes full cross-section utilization by forced upward airflow. The gas inlet of the conventional adsorption equipment is usually arranged on the side wall of the container, which is easy to cause local airflow short circuit. The present scheme forms a uniform airflow field through the top inlet. The conventional water bath equipment often immerses the pipeline in the liquid, which has the risk of medium penetration. The present scheme is arranged at a high position to maintain heat conduction and ensure airtightness. The present application realizes stable control of the active state of the adsorbent, eliminates the influence of temperature fluctuation on adsorption efficiency, and prolongs the effective adsorption time. The gas-solid two-phase contact mode is optimized, so that the flue gas components fully diffuse in the pipe body and react with the adsorbent surface. The risk of water bath medium polluting the gas pipeline is avoided, and the continuous operation ability of the purification system is ensured. Through the synergistic effect of physical adsorption and temperature control, the removal efficiency of polycyclic aromatic hydrocarbons in asphalt flue gas is significantly improved.

[0045] The present application further proposes that the adsorption purification pipe 7 is a U-shaped purification pipe or a ring-shaped purification pipe. The U-shaped purification pipe refers to a pipe body with a curved structure, which can be specifically formed by bending stainless steel material to form a double-port symmetrical U-shaped channel, and the bending radius can be 50-100mm. This structure prolongs the flue gas flow path and increases the contact time of alumina adsorbent and flue gas. The ring-shaped purification pipe refers to a pipe body with a closed ring structure, which can be specifically a ring-shaped quartz glass pipe or a metal ring pipe, and the ring diameter can be 200-300mm. This structure forms a circulating flow space to promote the vortex motion of flue gas to enhance the capture efficiency of pollutants on the adsorbent surface.

[0046] When the flue gas enters the U-shaped purification pipe from the inlet, a secondary flow is generated in the curved path, causing the airflow direction to be deflected multiple times. This flow pattern forces the flue gas to make more complete contact with the alumina particles packed in the pipe wall, and the residence time of the adsorbent per unit volume is extended compared to the straight pipe structure. For the annular purification pipe, the flue gas forms a vortex under the action of centrifugal force in the closed annular space, and the adsorbent particles are distributed in a gradient on the annular cross-section, forming a high-density adsorption layer near the pipe wall, effectively intercepting the asphalt smoke particles in the gas phase. Traditional adsorption purification devices generally use straight pipe structures, and the flue gas passes through the adsorption layer in a laminar flow state, which has the problem of insufficient contact time leading to incomplete utilization of the adsorbent. The U-shaped or annular structure changes the flow pattern, allowing the flue gas to extend the path and turbulent mixing in a limited space, overcoming the uneven distribution of gas flow in straight pipes. The present application realizes efficient adsorption of polycyclic aromatic hydrocarbons in asphalt flue gas, and improves the processing capacity of alumina adsorbent per unit volume, while avoiding the premature saturation of the adsorbent due to excessive local gas flow velocity. The purification device does not need to be frequently replaced during operation, and the maintenance cycle is extended.

[0047] The present application further proposes that the lime water purification device 8 is filled with lime water, and the cover of the lime water purification device 8 is provided with an air inlet hole and an air outlet hole. The flue gas outlet end of the flue gas conveying pipe II 5 passes through the air inlet hole of the cover and extends to the bottom of the lime water purification device 8, and the air inlet end of the tail gas pipe passes through the air outlet hole of the cover and extends to the top of the lime water purification device 8. The air inlet end of the tail gas pipe is located above the liquid surface of the lime water. The air inlet hole refers to the gas inlet channel provided on the cover, which can be realized by a metal sleeve structure with a sealing ring. Its function is to fix the flue gas conveying pipe at the bottom of the device to form a deep gas injection. The air outlet hole refers to the gas outlet channel which is spatially isolated from the air inlet hole. It can be realized by a short pipe structure welded independently. Its function is to build a one-way gas flow path above the liquid surface. The flue gas outlet end extending to the bottom refers to the structure that the end of the pipeline maintains a gap of 5-10 cm from the bottom of the container. It can be designed with the end of the bent pipe upwards. Its function is to increase the gas-liquid contact area by the upward diffusion of the gas.

[0048] When the asphalt flue gas containing acidic substances is injected through the pipeline extending to the bottom of the device, the gas rises slowly from the bottom of the lime water in the form of continuous bubbles, and the bubbles form a diffusion path in the liquid phase. The bubbles make full contact with the lime water during the rising process, and the acidic substances react with calcium hydroxide. The air inlet end of the tail gas pipe is arranged above the liquid surface, so that the purified gas forms a gas-liquid separation zone at the liquid surface, and the residual liquid droplets fall back to the liquid phase due to gravity. The dry gas is discharged through the air outlet hole. The spatial isolation of the air inlet and outlet channels forms a one-way gas flow path, preventing the short flow of unreacted gas.

[0049] Traditional purification devices mostly use surface spraying or shallow contact method, which results in short contact time and insufficient reaction. The present application increases the contact time to 2-3 times of the conventional method by forcing the gas to diffuse from the bottom. The gas outlet in the prior art is usually directly arranged at the top of the container, which easily leads to liquid droplet entrainment. The liquid surface separation zone in the present application realizes gas-liquid separation through gravity settling. The conventional device needs to be equipped with a circulating pump or a stirring device to promote gas-liquid mixing. The present application realizes efficient contact under non-powered conditions through physical structure optimization. The present application solves the problem of low purification efficiency of acidic substances caused by insufficient contact between lime water and asphalt fume. The contact time is prolonged and the diffusion effect is strengthened by bottom gas injection. The liquid surface separation zone is used to avoid the entrainment of liquid droplets in the purified gas. The device structure is simplified while achieving efficient neutralization of acidic substances.

[0050] The present application further proposes that the carrier gas device 1 is a nitrogen cylinder or an argon cylinder. The nitrogen cylinder refers to a high-pressure container for storing compressed nitrogen, which can be realized by a standard industrial cylinder connected with a pressure reducing valve and a carrier gas inlet pipe. Nitrogen is a non-active gas, which can isolate the oxygen environment during transportation to avoid high-temperature oxidation of asphalt components. The argon cylinder refers to a high-pressure container for storing compressed argon, which can be realized by a seamless steel cylinder connected with a heating device through a pipeline. Argon is a rare gas, which is completely inert and can eliminate the possibility of reaction between the carrier gas and the flue gas components.

[0051] Nitrogen or argon is transported into the sealed heating container through the carrier gas inlet pipe, mixed with the asphalt fume volatilized by heating to form inert mixed gas. Since nitrogen does not contain active oxygen, it can avoid the combination of asphalt derivatives with oxygen under high-temperature conditions to generate secondary pollutants. Argon does not react with polycyclic aromatic hydrocarbons and light boiling hydrocarbons in the flue gas during transportation, ensuring that the subsequent alumina adsorbent only physically adsorbs the target pollutants. The selection of the carrier gas enables the flue gas transportation system to operate in a constant chemical environment, avoiding the combustion risk that may be caused by traditional air carrier gas, and avoiding the reduction of purification efficiency caused by the participation of the carrier gas in the reaction.

[0052] Traditional laboratory devices often use air as a carrier gas, which is easy to react with active substances in high-temperature asphalt fume, producing oxidation byproducts and increasing the risk of explosion. When nitrogen or argon is used as a carrier gas, its chemical inertness ensures that the mixed gas remains stable during transportation and processing, eliminating safety hazards and avoiding interference with the purification effect of adsorbents and absorbents. The present application effectively avoids unintended reactions between the carrier gas and the components of asphalt fume, ensuring the specific adsorption efficiency of alumina adsorbent to target pollutants, and reducing the safety risk under high-temperature operating conditions through inert gas environment. The purification device can maintain stable chemical conditions when dealing with mixed gas and liquid pollutants, ensuring the full neutralization of residual pollutants by lime water.

[0053] The utility model is described in detail above in combination with the drawings, but the utility model is not limited to the above embodiment, and various changes can be made within the knowledge of those skilled in the art without departing from the purpose of the utility model.

Claims

1. A laboratory bitumen fume scrubbing device characterised in that: The device comprises a carrier gas device (1), a pitch smoke outlet device, an alumina adsorption purification device and a lime water purification device (8), the outlet end of the carrier gas device (1) is communicated with the carrier gas inlet of the pitch smoke outlet device through a carrier gas inlet pipe, the smoke outlet of the pitch smoke outlet device is communicated with the smoke inlet end of the alumina adsorption purification device through a smoke conveying pipe I, the smoke outlet end of the alumina adsorption purification device is communicated with the lime water purification device (8) through a smoke conveying pipe II (5), and the lime water purification device (8) is emptied through a tail gas pipe.

2. The laboratory bitumen fume scrubbing device according to claim 1, characterized in that the bitumen The smoke outlet device comprises a heating furnace (2) and a sealed heating container (3), the sealed heating container (3) is placed in the center of the heating area of the heating furnace (2), the sealed heating container (3) is filled with pitch, and the top cover of the sealed heating container (3) is provided with a carrier gas inlet and a smoke outlet.

3. The laboratory bitumen fume scrubbing device according to claim 2, characterized in that: The carrier gas inlet pipe passes through the carrier gas inlet of the top cover of the sealed heating container (3) and is inserted into the middle part of the sealed heating container (3).

4. The laboratory use bitumen fume purification device according to claim 1, characterized in that: The outer side of the smoke conveying pipe I is provided with a heat preservation sleeve (4).

5. The laboratory bitumen fume scrubbing device according to claim 4, characterized in that: The heat preservation sleeve (4) is of a flexible structure, and the inner layer of the heat preservation sleeve (4) is attached to the outer side wall of the smoke conveying pipe I.

6. The laboratory bitumen fume scrubbing device according to claim 4, characterized in that: The heat preservation sleeve (4) is uniformly provided with heating resistance wires, the heating resistance wires are connected with a power supply, and the smoke outlet end of the smoke conveying pipe I is provided with a digital thermometer.

7. The laboratory use bitumen fume purification device according to claim 1, characterized in that: The alumina adsorption purification device comprises a water bath heating device (6) and an adsorption purification pipe (7), the adsorption purification pipe (7) is vertically fixed in the water bath heating device (6), the adsorption purification pipe (7) is filled with alumina adsorbent, the opening end of the adsorption purification pipe (7) is a smoke inlet end and a smoke outlet end respectively, the smoke inlet end and the smoke outlet end are located directly above the water bath heating device (6), the smoke outlet end of the smoke conveying pipe I is communicated with the smoke inlet end of the adsorption purification pipe (7), and the smoke outlet end of the adsorption purification pipe (7) is communicated with the smoke inlet end of the smoke conveying pipe II (5).

8. The laboratory bitumen fume scrubbing device according to claim 7, characterized in that: The adsorption purification pipe (7) is a U-shaped purification pipe or a ring-shaped purification pipe.

9. The laboratory use bitumen fume purification device according to claim 1, characterized in that: The lime water purification device (8) is filled with lime water, the cover of the lime water purification device (8) is provided with an air inlet hole and an air outlet hole, the smoke outlet end of the smoke conveying pipe II (5) passes through the air inlet hole of the cover and extends to the bottom of the lime water purification device (8), the air inlet end of the tail gas pipe passes through the air outlet hole of the cover and extends to the top of the lime water purification device (8), and the air inlet end of the tail gas pipe is located above the lime water liquid level.

10. The laboratory use bitumen fume purification device according to claim 1, characterized in that: The carrier gas device (1) is a nitrogen cylinder or an argon cylinder.

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