Tail gas treatment device in asphalt production process

Abstract

The utility model relates to the technical field of asphalt production tail gas treatment, in particular to a tail gas treatment device in an asphalt production process, which comprises a gas treatment tank, a gas filtering device, a combustion device, a heating coil, a waste heat recovery device and a chimney, and a gas inlet pipe is arranged at the lower end of the gas treatment tank. The device is reasonable and compact in structure and convenient to use, tail gas is filtered layer by layer through the detachable filter screen and then fed into the combustion device to be combusted, generated flue gas passes through the waste heat recovery device and then is fed into the chimney through the gas outlet pipe to be discharged into the atmosphere, and waste heat is effectively utilized to preheat non-condensable tail gas when the non-condensable tail gas is filtered; through reasonable design of the flow direction of the air channel and the heat-conducting medium pipeline, the flow resistance of tail gas and heat-conducting media can be effectively reduced, sufficient combustion is promoted, energy consumption is reduced, combustible and volatile organic compounds in the tail gas are effectively removed, safety risks are reduced, and environmental pollution is reduced. The method has the characteristics of high treatment efficiency, good treatment effect, safety, labor saving, simplicity, convenience and high efficiency.

Description

Technical Field

[0001] This utility model relates to the field of asphalt production exhaust gas treatment technology, specifically an exhaust gas treatment device for the asphalt production process. Background Technology

[0002] The main negative electrode material used in current lithium-ion batteries is graphite-based carbon material that has undergone coating modification. This involves using high-soft-point coated asphalt to reduce the specific surface area of ​​the graphite-based carbon material, thereby improving the charge-discharge efficiency and cycle performance of lithium-ion batteries. During the production of high-soft-point coated asphalt, the exhaust gas mainly comes from two sources: first, asphalt powder melts in a high-temperature environment during heating and mixing in a high-temperature autoclave, producing asphalt fumes from the volatilization of light components in the asphalt; second, the raw carbon powder (petroleum coke, needle coke) is raw coke, and during heating, some volatile components escape, which are combustible organic compounds. Furthermore, because the raw materials in the production process are in the form of ultrafine powder, a high concentration of carbon powder is carried away during the exhaust process. Therefore, the main components of the exhaust gas during the production process are: asphalt fumes, combustible volatile organic gases, and a high concentration of carbon powder.

[0003] Chinese patent document CN216630091U discloses a tail gas treatment device for asphalt production, which includes a treatment box, an upper connecting cover, a filter screen, a fixed connecting frame, and a lower connecting cover. An air inlet pipe is inserted into the upper end of the treatment box, and the lower end of the air inlet pipe is fixedly connected to the upper connecting cover. A box door with a sealing ring is installed on the front side of the treatment box. The filter screen is fixedly connected to the middle of the fixed connecting frame. The filter screen, the fixed connecting frame, and the fixed connecting cylinder are evenly spaced inside the treatment box. The limiting mechanism is located at the connection between the fixed connecting frame and the fixed connecting cylinder. Although the exhaust gas treatment device can perform multi-stage filtration of particulate matter of different sizes in asphalt production exhaust gas, the treated exhaust gas is a non-condensable exhaust gas containing organic compounds such as carbon monoxide, methane, ethane, polycyclic aromatic hydrocarbons, benzene, and other volatile organic compounds. After emission, it will still cause environmental pollution. If such non-condensable exhaust gas mixes with oxygen in the air and reaches the flammability limit, it is easy to cause fires, explosions, and other safety accidents, posing a significant safety hazard. Summary of the Invention

[0004] The technical problem to be solved by this utility model is to provide a tail gas treatment device in the asphalt production process, which overcomes the shortcomings of the above-mentioned prior art. It can effectively solve the problem that the existing tail gas treatment devices for asphalt production cannot effectively remove combustible gases, polycyclic aromatic hydrocarbons, benzene and other volatile organic compounds in the tail gas, and the non-condensable tail gas still pollutes the environment and poses safety hazards.

[0005] This invention further solves the problems of low purification efficiency of non-condensable exhaust gas and inability to effectively utilize the residual heat in the exhaust gas of existing exhaust gas treatment devices for asphalt production.

[0006] The technical solution adopted by this utility model is as follows: a tail gas treatment device for asphalt production, including a gas treatment tank, a gas filtration device, a combustion device, a heating coil, a waste heat recovery device, and a chimney. The lower end of the gas treatment tank is provided with an inlet pipe, and the upper end with an exhaust pipe. A gas filtration device is located in the middle of the inner cavity of the gas treatment tank. The gas filtration device includes a lower hood, an upper hood, and at least three detachable filter screens. Each detachable filter screen has a handle at its front end. Filter screen mounting holes are provided on the front side of the gas treatment tank corresponding to the positions of each detachable filter screen. The outer edges of the lower and upper hoods are welded and fixed to the inner wall of the gas treatment tank and kept sealed. The inner cavity of the gas treatment tank between the lower and upper hoods forms a filtration chamber. A vertical air intake pipe connects the inlet pipe to the lower hood. A heating coil is located on the side wall of the gas treatment tank corresponding to the filtration chamber position. The detachable filter screens are spaced apart from bottom to top within the filtration chamber, and the aperture of each detachable filter screen varies from bottom to top. The components decrease in size sequentially. Above the gas filtration device is a combustion device, which includes a funnel-shaped combustion cylinder, an ejector, an igniter, and a gas supply pipe. The combustion cylinder is fixedly installed on the inner wall of the gas treatment tank above the gas filtration device. An ejector is located between the upper gas hood and the combustion cylinder. The middle of the ejector has an air intake port connected to the gas supply pipe. The outer end of the gas supply pipe extends through the side wall of the gas treatment tank and can deliver combustible gases or combustion-supporting gases such as natural gas or oxygen into the ejector. The lower inlet of the ejector is connected to the upper end of the inner cavity of the upper gas hood, and the upper outlet of the ejector is connected to the lower part of the inner cavity of the combustion cylinder. An igniter is located on the side wall of the combustion cylinder, which passes through the side wall of the combustion cylinder and extends to the upper end of the ejector. The exhaust pipe is connected to a waste heat recovery device, which can heat the liquid heat transfer medium in the heating coil. The lower end of the waste heat recovery device is connected to an exhaust pipe, which is equipped with an induced draft fan and connected to a chimney.

[0007] The following are further optimizations and / or improvements to the technical solution applied for:

[0008] Furthermore, as a preferred embodiment, the upper end of the heating coil extends through the upper right side wall of the gas treatment tank and forms a heater inlet. The upper part of the heating coil is coiled from top to bottom around the outside of the ejector. The upper middle part of the heating coil is coiled from top to bottom around the outside of the upper gas hood. The middle part of the heating coil is coiled from top to bottom inside the side wall of the gas treatment tank corresponding to the outside of the filter chamber. The lower middle part of the heating coil is coiled from top to bottom around the outside of the lower gas hood. The lower part of the heating coil is coiled from top to bottom around the outside of the priming vertical pipe. The lower end of the heating coil extends through the lower end of the right side wall of the gas treatment tank and forms a heater outlet.

[0009] Furthermore, preferably, the number of turns of the heating coil coiled outside the air intake riser is less than the number of turns of the heating coil coiled outside the air filter chamber.

[0010] Furthermore, as a preferred embodiment, a fixed plate lug is provided on the inner wall of the gas treatment tank at the upper end of the corresponding combustion cylinder and a first catalytic plate is installed thereon. A locking lug is provided on the outer edge of the first catalytic plate. The first catalytic plate is fixedly installed on the fixed plate lug by the locking lug and screws. At least one layer of second catalytic plate is fixed on the inner wall of the gas treatment tank above the first catalytic plate.

[0011] Furthermore, preferably, the waste heat recovery device includes a heat collector shell, a lower flange, a lower cover plate, an upper flange, a lower flange, an adjusting baffle, a neck pipe, and a heat absorption coil. The heat collector shell is cup-shaped with its opening facing downwards. An upper flange is fixed to the center of the bottom of the heat collector shell. The upper flange is connected to the exhaust pipe via an upper connector. A lower flange is provided on the outer side of the lower end of the heat collector shell, and a lower cover plate is fixedly installed with bolts. A lower flange is fixed to the center of the lower cover plate. The lower flange is connected to the exhaust pipe via a lower connector. An adjusting baffle that can move up and down is installed inside the inner cavity of the heat collector shell. The adjusting baffle is fixedly installed on the lower cover plate with no less than three adjusting bolts. The inner cavity of the heat collector shell above the adjusting baffle... A waste heat recovery chamber is formed, and a heat absorption coil is installed inside the waste heat recovery chamber. The heat absorption coil is welded and fixed to the inner wall of the heat collector shell by a connecting rod. The upper end of the heat absorption coil extends through the upper left side wall of the heat collector shell and forms a heat absorber liquid supply port. The lower end of the heat absorption coil extends through the middle left side wall of the heat collector shell and forms a heat absorber liquid return port. The heat absorber liquid supply port is connected to the heater inlet of the heating coil through a supply pipe. The heat absorber liquid return port is connected to the heater outlet of the heating coil through a return pipe with a circulation pump. The adjusting baffle has a baffle core hole in the center and a neck pipe is fixed thereon. The exhaust pipe is connected to the exhaust pipe in sequence through the upper connector, upper flange, waste heat recovery chamber, inner cavity of the neck pipe, lower flange, and lower connector.

[0012] Furthermore, as a preferred embodiment, the upper end of the neck pipe is welded and fixed to the adjusting partition plate, and the lower part of the neck pipe is located below the adjusting partition plate and is fixedly installed with a connecting sleeve by threads. A cup-shaped ash collection box is fixedly installed at the lower end of the connecting sleeve. The outer diameter of the connecting sleeve and the ash collection box is smaller than the inner diameter of the lower flange. The ash collection box can extend to the lower flange when the adjusting partition plate moves to the upper end of the lower cover plate.

[0013] Furthermore, preferably, the jet ejector includes a jet tube body, an air suction hood, a nozzle body, and a mixing tube body. The air suction hood is located in the middle of the inner cavity of the jet tube body. The middle part of the air suction hood protrudes outwards, forming an air suction chamber in the middle of its inner cavity. The outer side of the middle part of the air suction hood is welded and fixed to the inner wall of the jet tube body. An air intake port is located at the left end of the outer side of the jet tube body. The inner cavity of the air intake port communicates with the air suction chamber. The left end of the air intake port is connected to the inner end of the air supply pipe. The lower end of the air suction hood has a lower screw hole for fixing the nozzle body, and the upper end of the air suction hood has an upper screw hole for fixing the mixing tube body. The nozzle body includes a bottom conical section, a cylindrical section, a top conical section, and a nozzle port. The bottom conical section, cylindrical section, top conical section, and nozzle port are sequentially connected as a single unit from bottom to top. The outer conical surface of the bottom conical section is connected to the inner conical surface of the upper air hood. The nozzle tip cone section has an outer surface that is larger at the bottom and smaller at the top, facing the inner cavity port of the air intake. The inner wall of the nozzle tip cone section is also a conical surface that is larger at the bottom and smaller at the top. The inner walls of the nozzle cylindrical section and the nozzle port are cylindrical. The upper inner wall of the air intake chamber corresponding to the nozzle port position is a guide cone surface that is larger at the bottom and smaller at the top. The mixing tube is a cylindrical tube with a mixing cavity inside. The mixing cavity includes a cavity guide cone section, a cavity mixing section, a cavity diffusion section, and a cavity port section. The cavity guide cone section, cavity mixing section, cavity diffusion section, and cavity port section are connected sequentially from bottom to top. The inner wall of the cavity guide cone section is a conical surface with the same taper as the guide cone surface. The inner wall of the cavity mixing section is a cylindrical surface. The cavity diffusion section is a conical surface that is smaller at the bottom and larger at the top. The inner wall of the cavity port section is a cylindrical surface. The guide cone surface, the cavity guide cone section, and the outer side of the nozzle port form a funnel-shaped annular cavity with a continuously narrowing upper diameter.

[0014] Furthermore, preferably, the intake pipe is equipped with a flame arrester, which is located below the gas treatment tank and connected to the end of the induced draft pipe away from the lower gas hood; a pressure alarm gauge is provided on the outside of the gas treatment tank corresponding to the lower end of the detachable filter screen at the lowest position, and the pressure alarm gauge is connected to the filter chamber below the detachable filter screen through a connecting pipe; a basket filter is provided on the exhaust pipe, which is located on the transverse section of the exhaust pipe and the filter element can be removed from its lower end for cleaning.

[0015] Furthermore, as a preferred embodiment, the lower end of the gas treatment tank is provided with a support leg, and the upper end of the chimney is provided with a rain cap.

[0016] This utility model has a reasonable and compact structure and is easy to use. The exhaust gas is filtered layer by layer through a detachable filter screen and then sent into the combustion device for combustion. The generated flue gas is sent into the chimney and discharged into the atmosphere through the exhaust pipe after passing through the waste heat recovery device. It effectively utilizes waste heat to preheat the non-condensable exhaust gas during filtration. Through the rational design of the gas flow direction and heat transfer medium pipeline, it can effectively reduce the flow resistance of exhaust gas and heat transfer medium, promote complete combustion, reduce energy consumption, effectively remove combustible and volatile organic compounds in exhaust gas, reduce safety risks, and reduce environmental pollution. It has the characteristics of high treatment efficiency, good treatment effect, safety, labor saving, simplicity and high efficiency. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the main structure of this utility model;

[0018] Figure 2 for Figure 1 A magnified schematic diagram of the partial structure at point A in the middle;

[0019] Figure 3 for Figure 1 A cross-sectional enlarged schematic diagram of the waste heat recovery device.

[0020] Legend: 1 is a gas processing tank, 101 is an air intake riser, 2 is a gas filtration device, 200 is a gas filtration chamber, 201 is a lower gas hood, 202 is an upper gas hood, 203 is a detachable filter screen, 3 is a combustion device, 301 is a combustion cylinder, 302 is an ejector, 3020 is an air intake port, 3021 is a gas suction hood body, 3022 is a nozzle body, 30221 is the nozzle bottom cone section, 30222 is the nozzle cylindrical section, 30223 is... The nozzle top cone section, 30224 is the nozzle port, 3023 is the mixing tube body, 30230 is the mixing cavity, 30231 is the cavity guide cone section, 30232 is the cavity mixing section, 30233 is the cavity diffusion section, 30234 is the cavity port section, 3024 is the gas suction chamber, 30241 is the guide cone surface, 3025 is the bell mouth annular cavity, 303 is the igniter, 304 is the gas supply pipe, and 305 is the fixed plate lug. 06 is the first catalytic plate, 307 is the second catalytic plate, 4 is the heating coil, 401 is the heater inlet, 402 is the heater outlet, 5 is the waste heat recovery device, 500 is the waste heat recovery chamber, 501 is the heat collector shell, 502 is the lower flange, 503 is the lower cover plate, 504 is the upper flange, 505 is the lower flange, 506 is the adjusting baffle, 507 is the neck pipe, 5071 is the connecting sleeve, and 5072 is the ash collection screen. Box, 508 is the heat absorption coil, 509 is the upper connector, 510 is the lower connector, 511 is the adjusting bolt, 512 is the heat absorber liquid supply port, 513 is the heat absorber liquid return port, 6 is the chimney, 601 is the rain cap, 7 is the air inlet pipe, 8 is the exhaust pipe, 9 is the air outlet pipe, 901 is the induced draft fan, 10 is the liquid supply pipe, 11 is the circulating pump, 12 is the liquid return pipe, 13 is the flame arrester, 14 is the pressure alarm gauge, and 15 is the basket filter. Detailed Implementation

[0021] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0022] Example 1:

[0023] As attached Figure 1As shown, this utility model provides a tail gas treatment device for asphalt production, including a gas treatment tank 1, a gas filtration device 2, a combustion device 3, a heating coil 4, a waste heat recovery device 5, and a chimney 6. The lower end of the gas treatment tank 1 is provided with an inlet pipe 7, and the upper end of the gas treatment tank 1 is provided with an exhaust pipe 8. The gas filtration device 2 is located in the middle of the inner cavity of the gas treatment tank 1. The gas filtration device 2 includes a lower gas hood 201, an upper gas hood 202, and at least three detachable filter screens 203. Each detachable filter screen 203 has a handle at its front end, corresponding to the gas treatment... The front side of the tank 1 is provided with filter screen mounting holes. The outer edges of the lower gas hood 201 and the upper gas hood 202 are welded and fixed to the inner wall of the gas treatment tank 1 and kept sealed. The inner cavity of the gas treatment tank 1 between the lower gas hood 201 and the upper gas hood 202 forms a filter chamber 200. An air intake pipe 101 is connected between the air inlet pipe 7 and the lower gas hood 201. A heating coil 4 is provided in the side wall of the gas treatment tank 1 corresponding to the position of the filter chamber 200. The detachable filter screens 203 are arranged at intervals from bottom to top in the filter chamber 200. The aperture of each detachable filter screen 203 decreases from bottom to top. The gas treatment unit is equipped with a combustion device 3, which includes a funnel-shaped combustion cylinder 301, an ejector 302, an igniter 303, and a gas supply pipe 304. The combustion cylinder 301 is fixedly installed on the inner wall of the gas treatment tank 1 above the gas filtration device 2. An ejector 302 is provided between the upper gas hood 202 and the combustion cylinder 301. The ejector 302 has an air intake 3020 in the middle and is connected to the gas supply pipe 304. The outer end of the gas supply pipe 304 extends out of the side wall of the gas treatment tank 1 and can deliver combustible gases or combustion-supporting gases such as natural gas or oxygen into the ejector 302. The lower inlet of 2 is connected to the upper end of the inner cavity of the upper gas hood 202, and the upper outlet of the jet injector 302 is connected to the lower part of the inner cavity of the combustion cylinder 301. An igniter 303 is provided on the side wall of the combustion cylinder 301. The igniter 303 passes through the side wall of the combustion cylinder 301 and extends to the upper end of the jet injector 302. The exhaust pipe 8 is connected to a waste heat recovery device 5. The waste heat recovery device 5 can heat the liquid heat transfer medium in the heating coil 4. The lower end of the waste heat recovery device 5 is connected to an exhaust pipe 9. An induced draft fan 901 is provided on the exhaust pipe 9 and is connected to the chimney 6.

[0024] The non-condensable exhaust gas from the high-soft-point coated asphalt production process enters the gas treatment tank 1 through the inlet pipe 7, then enters the filter chamber 200 through the induced draft pipe 101 for filtration, and is then sent to the combustion device 3. The exhaust gas in the combustion chamber 301 is ignited by the burner head on the igniter 303, and the resulting flue gas is discharged through the exhaust pipe 8 at the top of the gas treatment tank 1. The purified exhaust gas then enters the waste heat recovery device 5 through the exhaust pipe 8 to heat the liquid heat transfer medium such as heat transfer oil in the heating coil 4. The exhaust gas after passing through the waste heat recovery device 5 is then sent into the chimney 6 through the outlet pipe 9 equipped with an induced draft fan 901. The exhaust gas is then discharged into the atmosphere. By installing multiple detachable filters 203 within the filtration chamber 200, non-condensable exhaust gas can be filtered in stages, thereby sequentially filtering solid particulate matter of different particle sizes. The detachable filters 203 facilitate the removal of the filters for cleaning the filtered particles, preventing filter clogging, promoting efficient resource utilization, reducing costs, and improving practicality. The separate installation of the filtration device 2 and combustion device 3 ensures that filtration and combustion purification processes do not interfere with each other, preventing the high-temperature gases generated during combustion from igniting the filter material on the detachable filters 203. The ejector 302 allows the upper hood 202 to... After the combustible volatile organic gases are fully mixed with natural gas, they are injected upwards into the combustion chamber 301 for combustion. The mixture is ignited by the igniter 303, which is safe and convenient to control, effectively reducing the safety risks associated with manual ignition. The exhaust fan 901 provides exhaust power for the exhaust gas, which helps to accelerate the discharge of the treated gas. At the same time, it can also improve the combustion conditions within the combustion device 3, ensuring a smooth and stable gas flow. It can burn and decompose the combustible volatile organic gases in the non-condensable exhaust gas into other gases, effectively removing combustible gases and volatile organic compounds from the exhaust gas, reducing safety risks and minimizing emissions. This invention addresses environmental pollution by rationally designing the gas flow direction in the preheating, filtration, combustion, and waste heat recovery processes for non-condensable exhaust gases, as well as the pipeline flow direction of the liquid heat-conducting medium in the waste heat recovery device 5 and heating coil 4. This effectively reduces the resistance to gas flow and the resistance to the circulation of the liquid heat-conducting medium during exhaust gas treatment, effectively utilizes the waste heat after exhaust gas combustion, reduces energy consumption, and improves exhaust gas treatment efficiency. This invention has a compact structure and a more rational design, resulting in better purification of non-condensable exhaust gases during asphalt production. It is safe, labor-saving, simple, and highly efficient.

[0025] Example 2:

[0026] As attached Figure 1As shown, the difference between this embodiment and Embodiment 1 is that the upper end of the heating coil 4 extends through the upper right side wall of the gas treatment tank 1 and forms a heater inlet 401. The upper part of the heating coil 4 is coiled from top to bottom around the outside of the ejector 302. The upper middle part of the heating coil 4 is coiled from top to bottom around the outside of the upper gas hood 202. The middle part of the heating coil 4 is coiled from top to bottom inside the side wall of the gas treatment tank 1 corresponding to the outside of the filter chamber 200. The lower middle part of the heating coil 4 is coiled from top to bottom around the outside of the lower gas hood 201. The lower part of the heating coil 4 is coiled from top to bottom around the outside of the priming vertical pipe 101. The lower end of the heating coil 4 extends through the lower end of the right side wall of the gas treatment tank 1 and forms a heater outlet 402.

[0027] During operation, non-condensable exhaust gas enters the gas treatment tank 1 through the inlet pipe 7, and flows from bottom to top through the induced draft pipe 101, lower gas hood 201, filter chamber 200, and upper gas hood 202 before entering the ejector 302. Meanwhile, the liquid heat transfer medium enters the heating coil 4 through the heater inlet 401, swirling downwards through the heating coil 4 and exiting through the heater outlet 402. As the liquid heat transfer medium flows downwards, its temperature gradually decreases. The downward flow direction of the liquid heat transfer medium conforms to the thermodynamic characteristic of liquids sinking after cooling, resulting in smoother flow within the heating coil 4. During this process, the lower-temperature liquid heat transfer medium at the bottom of the heating coil 4 initially preheats the non-condensable exhaust gas in the induced draft pipe 101. Then, the slightly higher-temperature liquid heat transfer medium in the middle of the heating coil 4 preheats the lower gas hood 201 and filter chamber 200. 00. The non-condensable exhaust gas in the upper gas hood 202 is gradually preheated. Finally, the higher-temperature liquid heat transfer medium at the top of the heating coil 4 preheats the mixed gas in the ejector 302 to a higher temperature. This achieves a gradual preheating of the non-condensable exhaust gas from low to high temperature by the heating coil 4, which can effectively improve the combustion efficiency of the non-condensable exhaust gas, reduce the consumption of natural gas during combustion, and make the exhaust gas burn more completely, thereby reducing the amount of pollutants emitted in the treated gas. It is also conducive to further making full use of the residual heat in the exhaust gas. The upward flow of the heated non-condensable exhaust gas conforms to the thermodynamic characteristics of gas rising when heated, effectively reducing the upward flow resistance. The non-condensable exhaust gas also flows more smoothly in the gas treatment tank 1, and can also prevent the non-condensable exhaust gas from condensing in the filter chamber 200 and corroding the components, thus extending the service life of the equipment.

[0028] As attached Figure 1 As shown, the number of turns of the heating coil 4 coiled outside the exhaust riser 101 is less than the number of turns of the heating coil 4 coiled outside the filter chamber 200. By having a heating coil 4 with more turns coiled outside the filter chamber 200, it is beneficial to make full use of the residual heat after the exhaust gas combustion to preheat the gas in the filter chamber 200, thereby further improving the combustion efficiency of the non-condensable exhaust gas.

[0029] Example 3:

[0030] As attached Figure 1 As shown, the difference between this embodiment and embodiments 1 and 2 is that a fixed plate lug 305 is provided on the inner wall of the gas treatment tank 1 at the upper end of the combustion cylinder 301, and a first catalytic plate 306 is installed thereon. A locking lug is provided on the outer edge of the first catalytic plate 306. The first catalytic plate 306 is fixedly installed on the fixed plate lug 305 by the locking lug and screws. At least one layer of second catalytic plates 307 is fixed on the inner wall of the gas treatment tank 1 above the first catalytic plate 306. The first catalytic plate 306 and the second catalytic plate 307 can effectively reduce the temperature required for gas decomposition and significantly increase the rate of gas decomposition. Through oxidation-reduction, harmful gases in the combustion gas are decomposed into harmless components, and the stability of the combustion reaction can be improved, further improving the efficiency of the combustion device in treating exhaust gas.

[0031] Example 4:

[0032] As attached Figure 1 , 3As shown, the difference between this embodiment and embodiments 1-3 is that the waste heat recovery device 5 includes a heat collector shell 501, a lower flange 502, a lower cover plate 503, an upper flange 504, a lower flange 505, an adjusting baffle 506, a neck pipe 507, and a heat absorption coil 508. The heat collector shell 501 is cup-shaped with its opening facing downwards. The upper flange 504 is fixed to the center of the bottom of the heat collector shell 501. The upper flange 504 is connected to the exhaust pipe 8 through an upper connector 509. A lower flange 502 is provided on the outer side of the lower end of the heat collector shell 501, and a lower cover plate 503 is fixedly installed on it with bolts. A lower connecting flange 505 is fixed in the middle of the lower cover plate 503. The lower connecting flange 505 is connected to the air outlet pipe 9 through a lower connector 510. An adjustable baffle 506 that can move up and down is installed in the inner cavity of the heat collector shell 501. The adjustable baffle 506 is fixedly installed on the lower cover plate 503 by no less than three adjusting bolts 511. The heat collector above the adjustable baffle 506... The inner cavity of the casing 501 forms a waste heat recovery chamber 500. A heat absorption coil 508 is installed within the waste heat recovery chamber 500. The heat absorption coil 508 is welded and fixed to the inner wall of the casing 501 via a connecting rod. The upper end of the heat absorption coil 508 protrudes through the upper left side wall of the casing 501, forming a heat absorber liquid supply port 512. The lower end of the heat absorption coil 508 protrudes through the middle left side wall of the casing 501, forming a heat absorber liquid return port 513. The heat absorber liquid supply port 512 supplies liquid... Pipe 10 is connected to the heater inlet 401 of the heating coil 4. The absorber return port 513 is connected to the heater outlet 402 of the heating coil 4 through the return pipe 12 with the circulation pump 11. The adjusting baffle 506 has a baffle core hole in the center and a neck pipe 507 is fixed thereon. The exhaust pipe 8 is connected to the exhaust pipe 9 in sequence through the upper connector 509, the upper flange 504, the waste heat recovery chamber 500, the inner cavity of the neck pipe 507, the lower flange 505, and the lower connector 510.

[0033] By turning the adjusting bolt 511, the up-down position of the adjusting baffle 506 can be changed, thereby adjusting the volume of the waste heat recovery chamber 500. This can adjust the amount of heat storage exhaust gas used to directly heat the heat absorption coil 508, thereby adjusting the maximum heating temperature of the heat absorption coil 508. It can also adjust the size of the cavity space where the heat absorption coil 508 is located, thereby avoiding resonance between the heat absorption coil 508 and the surrounding gas during operation due to thermal expansion and contraction. This can effectively reduce the noise of the heat absorption coil 508 in the waste heat recovery device 5 during operation.

[0034] Example 5:

[0035] As attached Figure 3As shown, the difference between this embodiment and embodiments 1-4 is that the upper end of the neck pipe 507 is welded and fixed to the adjusting partition 506, and the lower part of the neck pipe 507 is located below the adjusting partition 506 and is fixedly installed with a connecting sleeve 5071 by threads. A cup-shaped ash collection box 5072 is fixedly installed at the lower end of the connecting sleeve 5071. The outer diameter of the connecting sleeve 5071 and the ash collection box 5072 is smaller than the inner diameter of the lower flange 505. The ash collection box 5072 can extend below the lower flange 505 when the adjusting partition 506 moves to the upper end of the lower cover plate 503. The dust collection box 5072 can collect dust particles falling from the exhaust pipe 8, the upper flange 504, and the waste heat recovery chamber 500. After removing the lower connector 510, by moving the adjusting baffle 506 to the lower limit position, the dust collection box 5072 can be moved below the lower flange 505, so that the dust collection box 5072 can be removed for cleaning, making it more convenient to use.

[0036] Example 6:

[0037] As attached Figure 1 , 2As shown, the difference between this embodiment and embodiments 1-5 is that the jet injector 302 includes a jet tube body, an air suction hood 3021, a nozzle body 3022, and a mixing tube body 3023. The air suction hood 3021 is located in the middle of the inner cavity of the jet tube body. The middle part of the air suction hood 3021 protrudes outward, forming an air suction chamber 3024 in the middle of its inner cavity. The outer side of the middle part of the air suction hood 3021 is welded and fixed to the inner wall of the jet tube body. An air intake port 3020 is located at the left end of the outer side of the jet tube body. The inner cavity of the air intake port 3020 communicates with the air suction chamber 3024. The left end of the air intake port 3020 is connected to the inner end of the air supply pipe 304. Connected to the upper air intake hood 3021, the lower end of the hood 3021 has a lower screw hole for fixing a nozzle body 3022, and the upper end of the air intake hood 3021 has an upper screw hole for fixing a mixing tube body 3023. The nozzle body 3022 includes a nozzle bottom conical section 30221, a nozzle cylindrical section 30222, a nozzle top conical section 30223, and a nozzle port 30224. The nozzle bottom conical section 30221, the nozzle cylindrical section 30222, the nozzle top conical section 30223, and the nozzle port 30224 are connected as a whole from bottom to top. The outer conical surface of the nozzle bottom conical section 30221 is adapted to the inner conical surface of the upper air intake hood 202. The outer surface of the nozzle top cone section 30223 is a conical surface that is larger at the bottom and smaller at the top, and it faces the inner cavity port of the air intake 3020. The inner wall of the nozzle top cone section 30223 is also a conical surface that is larger at the bottom and smaller at the top. The inner walls of the nozzle cylindrical section 30222 and the nozzle port 30224 are cylindrical surfaces. The upper inner wall of the air intake chamber 3024 corresponding to the nozzle port 30224 is a guide cone surface 30241 that is larger at the bottom and smaller at the top. The mixing tube 3023 is a cylindrical tube with a mixing cavity 30230 inside. The mixing cavity 30230 includes a cavity guide cone section 30231, a cavity mixing section 30232, a cavity diffusion section 30233, and a tube. The cavity port segment 30234, the cavity guide cone segment 30231, the cavity mixing segment 30232, the cavity diffusion segment 30233, and the cavity port segment 30234 are connected sequentially from bottom to top. The inner wall of the cavity guide cone segment 30231 is a conical surface with the same taper as the guide cone surface 30241. The inner wall of the cavity mixing segment 30232 is a cylindrical surface. The cavity diffusion segment 30233 is a conical surface with a smaller bottom and a larger top. The inner wall of the cavity port segment 30234 is a cylindrical surface. The guide cone surface 30241, the cavity guide cone segment 30231, and the outer side of the nozzle port 30224 form a funnel-shaped annular cavity 3025 with a continuously narrowing upper diameter.

[0038] The nozzle body 3022 increases the flow rate of the non-condensable exhaust gas in the upper gas hood 202, allowing it to enter the gas suction chamber 3024 of the gas suction hood body 3021. After passing through the bell-shaped annular cavity 3025, it is rapidly ejected upward through the mixing pipe 30230, creating a relative negative pressure in the gas suction chamber 3024 and generating a Venturi effect. This draws the combustible gas or combustion-supporting gas from the gas supply pipe 304 into the gas suction chamber 3024, and allows the combustible gas or combustion-supporting gas to mix rapidly with the non-condensable exhaust gas in the mixing pipe 30230. When the mixture is sent into the combustion cylinder 301 and ignited by the igniter 303, the combustion is more complete and stable.

[0039] Example 7:

[0040] As attached Figure 1 As shown, the difference between this embodiment and embodiments 1-6 is that a flame arrester 13 is provided on the air intake pipe 7. The flame arrester 13 is located below the gas processing tank 1 and is connected to the end of the induced draft pipe 101 away from the lower gas cover 201. A pressure alarm gauge 14 is provided on the outside of the gas processing tank 1 at the lower end of the detachable filter screen 203 at the lowest position. The pressure alarm gauge 14 is connected to the filter chamber 200 below the detachable filter screen 203 through a connecting pipe. A basket filter 15 is provided on the exhaust pipe 8. The basket filter 15 is located on the horizontal section of the exhaust pipe 8 and the filter element can be removed from its lower end for cleaning.

[0041] Because the air intake riser 101 and the filter chamber 200 below the detachable filter screen 203 form a buffer cavity, the pressure fluctuations of the non-condensable exhaust gas delivered from the intake pipe 7 can be buffered and stabilized, ensuring that the non-condensable exhaust gas is delivered evenly and stably to the detachable filter screen 203, achieving uniform and stable filtration and purification; the flame arrester 13 installed before the air intake riser 101 can effectively improve the safety performance of other equipment at the front end of the intake pipe 7, and its placement below the gas treatment tank 1 results in a smaller overall size of the equipment, reducing the space it occupies; the pressure alarm gauge 14 can promptly detect and eliminate pressure fluctuations. Check the pressure value inside the air filtration chamber 200 to observe the blockage of the removable filter screen 203 and determine whether it needs to be removed and cleaned. The basket filter 15 is located on the horizontal section of the exhaust pipe 8, making it located on the side of the gas treatment tank 1, which makes it easier to remove its filter element for cleaning. The basket filter 15 can purify and filter the high-temperature exhaust gas that is about to enter the waste heat recovery device 5 in advance, filtering out dust particles and impurities such as combustion ash in the gas, and preventing dust and impurities from covering the heat absorption coil 508 and affecting the heat exchange efficiency.

[0042] As required, as attached Figure 1As shown, the lower end of the gas treatment tank 1 is equipped with a support leg, and the upper end of the chimney 6 is equipped with a rain cap 601. The rain cap 601 can prevent rain and snow from entering the chimney 6, effectively preventing water accumulation and corrosion inside the chimney 6. At the same time, it can prevent rainwater from entering the chimney 6 and mixing with the exhaust gas to form acidic substances that corrode equipment components.

[0043] In the description of this application, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0044] This utility model is described in the appendix to the specification. Figure 1 For reference purposes, directional terms such as "up," "down," "left," "right," "top," and "bottom" are used only to better and more clearly explain and understand this utility model, and are not intended to indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0045] The preferred embodiments of this utility model have been described above, but should not be construed as limiting the claims. This utility model is not limited to the above embodiments, and its specific structure may vary. Any simple modifications, equivalent changes, and substitutions made to the above embodiments based on the technical essence of this utility model are still within the protection scope of this utility model.

Claims

1. A tail gas treatment device for asphalt production process, characterized in that: The system includes a gas processing tank, a gas filtration device, a combustion device, a heating coil, a waste heat recovery device, and a chimney. The gas processing tank has an inlet pipe at its lower end and an exhaust pipe at its upper end. A gas filtration device is located in the middle of the gas processing tank's inner cavity. This device includes a lower hood, an upper hood, and at least three detachable filter screens. Each detachable filter screen has a handle at its front end. Filter screen mounting holes are located on the front side of the gas processing tank corresponding to each detachable filter screen position. The outer edges of the lower and upper hoods are welded and fixed to the inner wall of the gas processing tank, maintaining a seal. The inner cavity of the gas processing tank between the lower and upper hoods forms a filtration chamber. A vertical air intake pipe connects the inlet pipe to the lower hood. A heating coil is located on the side wall of the gas processing tank corresponding to the filtration chamber position. The detachable filter screens are spaced apart from bottom to top within the filtration chamber, with the aperture of each detachable filter screen decreasing sequentially from bottom to top. The device is equipped with a combustion device, which includes a funnel-shaped combustion cylinder, an ejector, an igniter, and a gas supply pipe. The combustion cylinder is fixedly installed on the inner wall of a gas treatment tank above a gas filtration device. An ejector is provided between the upper gas hood and the combustion cylinder. The middle part of the ejector has an air intake and is connected to a gas supply pipe. The outer end of the gas supply pipe extends through the side wall of the gas treatment tank and can deliver natural gas or oxygen into the ejector. The lower inlet of the ejector is connected to the upper end of the inner cavity of the upper gas hood, and the upper outlet of the ejector is connected to the lower part of the inner cavity of the combustion cylinder. An igniter is provided on the side wall of the combustion cylinder. The igniter passes through the side wall of the combustion cylinder and extends to the upper end of the ejector. The exhaust pipe is connected to a waste heat recovery device, which can heat the liquid heat transfer medium in the heating coil. The lower end of the waste heat recovery device is connected to an exhaust pipe, which is equipped with an induced draft fan and connected to a chimney.

2. The exhaust gas treatment device for asphalt production process according to claim 1, characterized in that: The upper end of the heating coil extends through the upper right side wall of the gas treatment tank and forms a heater inlet. The upper part of the heating coil is coiled from top to bottom around the outside of the ejector. The upper middle part of the heating coil is coiled from top to bottom around the outside of the upper gas hood. The middle part of the heating coil is coiled from top to bottom inside the side wall of the gas treatment tank corresponding to the outside of the filter chamber. The lower middle part of the heating coil is coiled from top to bottom around the outside of the lower gas hood. The lower part of the heating coil is coiled from top to bottom around the outside of the priming vertical pipe. The lower end of the heating coil extends through the lower end of the right side wall of the gas treatment tank and forms a heater outlet.

3. The exhaust gas treatment device for asphalt production process according to claim 2, characterized in that: The number of turns of the heating coil coiled outside the air intake vertical pipe is less than the number of turns of the heating coil coiled outside the air filter chamber.

4. A tail gas treatment device for asphalt production process according to claim 1, 2, or 3, characterized in that: A fixed plate lug is provided on the inner wall of the gas treatment tank at the upper end of the combustion cylinder, and a first catalytic plate is installed thereon. A locking lug is provided on the outer edge of the first catalytic plate. The first catalytic plate is fixed on the fixed plate lug by the locking lug and screws. At least one second catalytic plate is fixed on the inner wall of the gas treatment tank above the first catalytic plate.

5. A tail gas treatment device for asphalt production process according to claim 1, 2, or 3, characterized in that: The waste heat recovery device includes a heat collector shell, a lower flange, a lower cover plate, an upper flange, a lower flange, an adjusting baffle, a neck pipe, and a heat absorption coil. The heat collector shell is cup-shaped with its opening facing downwards. An upper flange is fixed to the center of the bottom of the heat collector shell, and the upper flange is connected to an exhaust pipe via an upper connector. A lower flange is provided on the outer side of the lower end of the heat collector shell, and a lower cover plate is fixedly installed thereon with bolts. A lower flange is fixed to the center of the lower cover plate, and the lower flange is connected to an exhaust pipe via a lower connector. An adjusting baffle that can move up and down is installed inside the inner cavity of the heat collector shell. The adjusting baffle is fixedly installed on the lower cover plate with no less than three adjusting bolts. The inner cavity of the heat collector shell above the adjusting baffle forms a waste heat recovery area. The waste heat recovery chamber is equipped with a heat absorption coil, which is welded and fixed to the inner wall of the heat collector shell by a connecting rod. The upper end of the heat absorption coil extends through the upper left side wall of the heat collector shell and forms the heat absorber liquid supply port, while the lower end extends through the middle left side wall of the heat collector shell and forms the heat absorber liquid return port. The heat absorber liquid supply port is connected to the heater inlet of the heating coil through a supply pipe, and the heat absorber liquid return port is connected to the heater outlet of the heating coil through a return pipe with a circulation pump. The adjusting baffle has a baffle core hole in the center and a neck pipe is fixed thereon. The exhaust pipe is connected to the exhaust pipe in sequence through the upper connector, upper flange, waste heat recovery chamber, inner cavity of the neck pipe, lower flange, and lower connector.

6. The exhaust gas treatment device for asphalt production process according to claim 4, characterized in that: The waste heat recovery device includes a heat collector shell, a lower flange, a lower cover plate, an upper flange, a lower flange, an adjusting baffle, a neck pipe, and a heat absorption coil. The heat collector shell is cup-shaped with its opening facing downwards. An upper flange is fixed to the center of the bottom of the heat collector shell, and the upper flange is connected to an exhaust pipe via an upper connector. A lower flange is provided on the outer side of the lower end of the heat collector shell, and a lower cover plate is fixedly installed thereon with bolts. A lower flange is fixed to the center of the lower cover plate, and the lower flange is connected to an exhaust pipe via a lower connector. An adjusting baffle that can move up and down is installed inside the inner cavity of the heat collector shell. The adjusting baffle is fixedly installed on the lower cover plate with no less than three adjusting bolts. The inner cavity of the heat collector shell above the adjusting baffle forms a waste heat recovery area. The waste heat recovery chamber is equipped with a heat absorption coil, which is welded and fixed to the inner wall of the heat collector shell by a connecting rod. The upper end of the heat absorption coil extends through the upper left side wall of the heat collector shell and forms the heat absorber liquid supply port, while the lower end extends through the middle left side wall of the heat collector shell and forms the heat absorber liquid return port. The heat absorber liquid supply port is connected to the heater inlet of the heating coil through a supply pipe, and the heat absorber liquid return port is connected to the heater outlet of the heating coil through a return pipe with a circulation pump. The adjusting baffle has a baffle core hole in the center and a neck pipe is fixed thereon. The exhaust pipe is connected to the exhaust pipe in sequence through the upper connector, upper flange, waste heat recovery chamber, inner cavity of the neck pipe, lower flange, and lower connector.

7. The exhaust gas treatment device for asphalt production process according to claim 5, characterized in that: The upper end of the neck pipe is welded and fixed to the adjusting partition plate. The lower part of the neck pipe is located below the adjusting partition plate and is fixedly installed with a connecting sleeve by threads. A cup-shaped ash collection box is fixedly installed at the lower end of the connecting sleeve. The outer diameter of the connecting sleeve and the ash collection box is smaller than the inner diameter of the lower flange. The ash collection box can extend to the lower flange when the adjusting partition plate moves to the upper end of the lower cover plate.

8. A tail gas treatment device for asphalt production process according to claim 6, characterized in that: The upper end of the neck pipe is welded and fixed to the adjusting partition plate. The lower part of the neck pipe is located below the adjusting partition plate and is fixedly installed with a connecting sleeve by threads. A cup-shaped ash collection box is fixedly installed at the lower end of the connecting sleeve. The outer diameter of the connecting sleeve and the ash collection box is smaller than the inner diameter of the lower flange. The ash collection box can extend to the lower flange when the adjusting partition plate moves to the upper end of the lower cover plate.

9. A tail gas treatment device for asphalt production process according to claim 1, 2, 3, 6, 7, or 8, characterized in that: The jet injector includes a jet tube body, an air suction hood, a nozzle body, and a mixing tube body. The air suction hood is located in the middle of the inner cavity of the jet tube body. The middle part of the air suction hood protrudes outwards, forming an air suction chamber in the middle of its inner cavity. The outer side of the middle part of the air suction hood is welded and fixed to the inner wall of the jet tube body. An air intake port is located at the left end of the outer side of the jet tube body. The inner cavity of the air intake port communicates with the air suction chamber, and the left end of the air intake port is connected to the inner end of the air supply pipe. The lower end of the air suction hood has a lower screw hole for fixing the nozzle body, and the upper end of the air suction hood has an upper screw hole for fixing the mixing tube body. The nozzle body includes a bottom conical section, a cylindrical section, a top conical section, and a nozzle port. The bottom conical section, cylindrical section, top conical section, and nozzle port are connected sequentially from bottom to top. The outer conical surface of the bottom conical section matches the inner conical surface of the upper air hood. The outer surface of the nozzle tip cone section is a conical surface that is larger at the bottom and smaller at the top, and it faces the inner cavity port of the air intake. The inner wall of the nozzle tip cone section is also a conical surface that is larger at the bottom and smaller at the top. The inner walls of the nozzle cylindrical section and the nozzle port are cylindrical surfaces. The upper inner wall of the air intake chamber corresponding to the nozzle port position is a guide cone surface that is larger at the bottom and smaller at the top. The mixing tube is a cylindrical tube with a mixing cavity inside. The mixing cavity includes a cavity guide cone section, a cavity mixing section, a cavity diffusion section, and a cavity port section. The cavity guide cone section, cavity mixing section, cavity diffusion section, and cavity port section are connected sequentially from bottom to top. The inner wall of the cavity guide cone section is a conical surface with the same taper as the guide cone surface. The inner wall of the cavity mixing section is a cylindrical surface. The cavity diffusion section is a conical surface that is smaller at the bottom and larger at the top. The inner wall of the cavity port section is a cylindrical surface. The guide cone surface, the cavity guide cone section, and the outer side of the nozzle port form a funnel-shaped annular cavity with a continuously narrowing upper diameter.

10. A tail gas treatment device for asphalt production process according to claim 9, characterized in that: A flame arrester is installed on the air intake pipe, which is located below the gas treatment tank and connected to the end of the venting riser away from the lower hood. A pressure alarm gauge is installed on the outside of the gas treatment tank at the lower end of the detachable filter screen at the lowest position. The pressure alarm gauge is connected to the filter chamber below the detachable filter screen through a connecting pipe. A basket filter is installed on the exhaust pipe, which is located on the horizontal section of the exhaust pipe and allows the filter element to be removed from its lower end for cleaning. The lower end of the gas treatment tank is equipped with a support leg, and the upper end of the chimney is equipped with a rain cap.

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