Asphalt fume treatment plant

Abstract

The present application relates to asphalt tail gas treatment equipment, including spray tower, the spray tower includes air inlet pipe, tower body and air outlet pipe, the air inlet pipe is connected with the lower side of the tower body, the air outlet pipe is connected with the top of the tower body, the air inlet pipe is communicated with the air outlet pipe through the tower body, the spray assembly is arranged in the tower body, the fan and the dirty oil purification device are installed at the connection of the air outlet pipe and the tower body, the spray assembly includes water inlet pipe and several spray heads, the water inlet pipe penetrates the side wall of the tower body and is communicated with the spray head, the fan is installed in the air outlet pipe and the tower body, the dirty oil purification device includes base, heat radiation strip and oil absorption material, the oil absorption material is filled in the base, the upper side of the base facing the fan is inclined to the center, a plurality of heat radiation strips are evenly spaced along the inclined direction of the upper side of the base, a plurality of oil leakage holes are arranged between two heat radiation strips. The fan is heated by the dirty oil purification device to prevent the tail gas from being hardened on the fan blade.

Description

Technical Field

[0001] This invention relates to the field of exhaust gas treatment technology, and in particular to asphalt exhaust gas treatment equipment. Background Technology

[0002] Asphalt is a brownish-black organic gel-like substance, a byproduct of the petrochemical industry, mainly obtained by distilling coal tar and crude oil. Its main components are asphaltenes and resins, followed by high-boiling-point mineral oils and small amounts of oxygen, sulfur, and nitrogen compounds. It is lustrous and exists in liquid, semi-solid, or solid states. It becomes brittle at low temperatures and has good adhesive and anti-corrosion properties. During asphalt production and processing, the continuous heating, dispersion, and stirring of asphalt and its impurities lead to the release of certain amounts of organic and inorganic matter, high-heat fumes, and dust. The main components are large amounts of suspended particles, oily fumes, and toxic aromatic compounds, which, if directly emitted, cause environmental pollution.

[0003] Existing methods for treating asphalt exhaust gas generally include: 1. Thermal incineration: Asphalt fumes are directly introduced into an incineration unit, where intense heat is used to remove waste gas components. 2. Adsorption purification: Adsorption materials are used to absorb one or more components from the asphalt-mixed fumes to achieve purification. The complete adsorption process can be divided into physical adsorption and chemical adsorption. 3. Electrostatic precipitation: When asphalt fumes enter an electrostatic field, the corona discharge generated between the cathode and anode breaks down the molecular structure of the asphalt fumes, causing the molecular bonds to break and thus achieving purification. Currently, the most commonly used method in the industry is spraying followed by adsorption purification of the exhaust gas. However, asphalt exhaust gas is characterized by a high concentration of oily molecules, which are highly prone to adhesion. During the spraying process, the spray nozzles become clogged, and liquid to solid asphalt adheres to the pipes and fan blades, forming solidified asphalt. This solidified asphalt is difficult to remove, causing nozzle blockage, fan blade hardening, and even damage, significantly reducing equipment lifespan and, in severe cases, rendering the system unusable. Summary of the Invention

[0004] Therefore, it is necessary to provide asphalt exhaust gas treatment equipment to address the above-mentioned problems.

[0005] An asphalt exhaust gas treatment device includes a spray tower. The spray tower includes an inlet pipe, a tower body, and an outlet pipe. The inlet pipe is connected to the lower side of the tower body, and one end of the outlet pipe is connected to the top of the tower body. The inlet pipe communicates with the outlet pipe through the tower body. A spray assembly is installed inside the tower body. A fan and a waste oil purification device are installed at the connection between the outlet pipe and the tower body. The spray assembly includes a water inlet pipe and several nozzles. The water inlet pipe penetrates the side wall of the tower body. Each nozzle includes a housing and several nozzles. The housing is hollow, and its upper end is detachably connected to the water outlet of the water inlet pipe. The lower end is spherical, and several nozzles are detachably installed on the spherical surface at the lower end of the housing. An expansion section is provided at the connection between the air outlet pipe and the tower body. The fan is installed in the expansion section. The sludge and oil purification device includes a base, heat radiation strips, and oil-absorbing material. The base is hollow and ring-shaped. The upper side of the base facing the fan is inclined towards the center. Several heat radiation strips are evenly spaced along the inclined direction of the upper side of the base. Several oil leakage holes are provided between two heat radiation strips. The oil-absorbing material fills the base and seals the oil leakage holes.

[0006] Preferably, the oil-absorbing material is aluminum silicate fiber cotton.

[0007] Preferably, a groove is provided between the two heat radiation strips, and a plurality of oil leakage holes are spaced apart in the groove.

[0008] Preferably, the heat radiation strip is triangular in shape.

[0009] Preferably, the nozzle is hollow, a wire mesh is provided at the nozzle outlet, a perforated plate is provided inside the nozzle, and a baffle is installed at the nozzle port. The baffle is connected to the perforated plate through a spring rod, and the baffle is in movable contact with the nozzle port.

[0010] Preferably, the baffle is umbrella-shaped, and the edge of the baffle has a notch.

[0011] Preferably, it also includes an adsorption tower, with the other end of the gas outlet pipe connected to the lower end of the adsorption tower, and the adsorption tower is provided with a first adsorption plate, a second adsorption plate and a third adsorption plate arranged at intervals from bottom to top.

[0012] Preferably, the first adsorption plate includes a first screen, a gravel layer, and a heat exchange tube, wherein the gravel layer is filled in the first screen and the heat exchange tube is buried in the gravel layer.

[0013] Preferably, the second adsorption plate includes a second screen and a porous ceramic ball layer, wherein the porous ceramic ball layer fills the second screen.

[0014] Preferably, the third adsorption plate includes a third screen and activated carbon, with the activated carbon filling the third screen.

[0015] The advantages of this invention are: 1. The nozzle and the housing are detachably connected, which makes it easy to clean or replace a single nozzle directly after it becomes clogged, without having to replace the entire nozzle head, greatly reducing the cost of use and indirectly improving the service life of the entire nozzle head; 2. An oil purification device is installed below the fan. When the fan is working, oil fume molecules will adhere to the fan blades facing the spray tower. After the heat radiation strip is energized, it radiates heat to the fan blades, causing the oil fume molecules on the fan blades to heat up and be flung away by the fan blades, preventing the oil fume molecules from condensing and condensing on the fan blades. The liquid oil fume molecules follow the inclined surface of the base and are absorbed by the oil-absorbing material from the oil leakage hole, thus completing the collection. This ensures the working condition of the fan, improves the service life of the fan, reduces the amount of oil fume adsorbed in the exhaust pipe, and prevents the exhaust pipe from becoming clogged over time. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of an asphalt tail gas treatment device in one embodiment;

[0017] Figure 2 This is a schematic diagram of an explosion of a waste oil purification device;

[0018] Figure 3 An explosion diagram of a waste oil purification device from another perspective;

[0019] Figure 4 This is a schematic diagram of a nozzle explosion.

[0020] Figure 5 This is a schematic diagram of a nozzle explosion. Detailed Implementation

[0021] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention can be practiced in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0022] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0023] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0024] like Figures 1-4As shown, the asphalt exhaust gas treatment equipment includes a spray tower 1. The spray tower 1 includes an inlet pipe 11, a tower body 12, and an outlet pipe 13. The inlet pipe 11 is connected to the lower side of the tower body 12, and one end of the outlet pipe 13 is connected to the top of the tower body 12. The inlet pipe 11 communicates with the outlet pipe 13 through the tower body 12. A spray assembly 3 is installed inside the tower body 12. A fan 4 and a waste oil purification device 5 are installed at the connection between the outlet pipe 13 and the tower body 12. The spray assembly 3 includes a water inlet pipe 31 and several nozzles 32. The water inlet pipe 31 penetrates the side wall of the tower body 12. The nozzles 32 include a housing 321 and several nozzles 322. The housing 321 is hollow, and the upper end of the housing 321 is detachably connected to the outlet of the water inlet pipe 31. The lower end of the housing 321 is spherical, and several nozzles 322 are detachably installed on the spherical surface at the lower end of the housing 321. An expansion section 131 is provided at the connection between the air outlet pipe 13 and the tower body 12. The fan 4 is installed in the expansion section 131. The sludge and oil purification device 5 includes a base 51, heat radiation strips 52 and oil-absorbing material 53. The base 51 is hollow and ring-shaped. The upper side of the base 51 facing the fan 4 is inclined towards the center. Several heat radiation strips 52 are evenly spaced along the inclined direction of the upper side of the base 51. Several oil leakage holes 511 are provided between two heat radiation strips 52. The oil-absorbing material 53 fills the base 51 and seals the oil leakage holes 511. Specifically, in this embodiment, during use, high-temperature asphalt exhaust gas enters the spray tower 1 through the air inlet pipe 11. The spray tower 1 is a circular tower type, and the spray assembly 3 is installed in the middle of the spray tower 1. When the high-temperature exhaust gas rises, the water pump inputs absorbent liquid into the spray tower 1 through the water inlet pipe 31. The absorbent liquid is sprayed into a water mist through the nozzle 32. In this design, the lower end of the shell 32 is designed to be spherical, so that the absorbent liquid sprayed by the nozzle 322 has a wider range and reacts more fully with the exhaust gas. When the exhaust gas comes into contact with the mist-like absorbent liquid sprayed by the nozzle 32, not only does the temperature of the exhaust gas decrease, but the dust particles carried in it are also encapsulated by water droplets and fall to the bottom of the spray tower 1 under their own gravity, thus completing the collection. It should be noted that each nozzle 322 is installed on the housing 321 individually using a threaded connection. This prevents oil fume molecules in the exhaust gas from adhering to dust particles and clogging the nozzle 322 over time. In this case, maintenance personnel can replace only the individual nozzle 322 without replacing the entire spray head 32, which greatly reduces the cost of use. Furthermore, clogging of a single nozzle 322 will not affect the use of the entire spray head 32.

[0025] Furthermore, an exhaust pipe 13 is provided at the upper end of the spray tower 1, which is connected to the spray tower 1. An expansion section 131 is provided at its connection point for installing a fan 4. When the fan 4 is turned on, it draws air, causing the exhaust gas to mix with water mist and enter the adsorption tower 2 through the exhaust pipe 13 for physical adsorption purification before being discharged. When the oil molecules in the exhaust gas come into contact with the blades of the fan 4, they will directly adhere to the blades. Over time, as the exhaust gas temperature decreases, the liquid condenses on the blades, damaging the fan 4 and causing it to malfunction. Therefore, in this technical solution, to prevent oil molecules from condensing and condensing on the fan blades of the fan 4, an oil purification device 5 is installed below the fan 4. This device includes a base 51, a heat radiation strip 52, and an oil-absorbing material 53. The base 51 is made of a high-temperature resistant material with low thermal conductivity to prevent the heat radiation strip 52 from conducting its own temperature into the base 51, thus reducing its own temperature and the heat radiation effect on the fan 4. The base 51 is annular, facilitating the passage of exhaust gas. Its hollow interior allows for the filling of the high-temperature resistant oil-absorbing material 53. The upper side of the base 51 is inclined towards the center, with several heat radiation strips 52 spaced along this inclination. It should be noted that each heat radiation strip 52 contains a built-in electric heating wire. When energized, the wire dissipates heat, radiating heat to the fan 4, keeping the oil molecules on the fan blades in a liquid state. As the fan 4 continues to rotate and perform work, when the centrifugal force exerted on the oil molecules by the fan blades exceeds their adsorption force, they are flung onto the base 51. Because the base 51 is inclined and the heat radiation strips 52 act as guides, the oil molecules slide down the inclination direction, falling into the oil drain hole 511 and being absorbed by the oil-absorbing material 53. Specifically, in the embodiment, the oil-absorbing material 53 is aluminum silicate fiber cotton, which has strong high temperature resistance. In order to prevent the oil-absorbing material 53 from evaporating due to heat transfer from the base 51 after absorbing oil, a heat-insulating coating is provided on the inner side of the base 51, or heat-insulating cotton is wrapped on the surface of the oil-absorbing material 53. The oil-absorbing material 53 only needs to leak out at the oil leakage hole 511.

[0026] like Figures 2-3 As shown, a groove 521 is provided between the two heat radiation strips 52. After the oily liquid on the fan blades 4 is thrown onto the base 51, it slides down the inclined surface of the base 51, allowing the oily liquid to collect in the groove 521. This prevents the liquid from spreading out on the upper side of the base 51, increasing its surface area, making it easier to evaporate when heated, and then hardening on the surface of the base 51 after drying. Several oil drain holes 511 are arranged in a row, spaced apart in the groove 521. The oily liquid is captured and collected by the oil-absorbing material 53 from the oil drain holes 511, preventing the oily liquid from adhering to the surface of the base 51. Over time, the oily liquid can easily harden back into a solid state and block the oil drain holes 511.

[0027] like Figures 2-3As shown, the heat radiation strip 52 is triangular in shape, so that the oil that is flung by the fan blades 4 slides down the heat radiation strip 52 into the groove 521, avoiding continuous adhesion to the heat radiation strip 52. Under the influence of the heat radiation strip 52, it is easy to re-evaporate into a gaseous state.

[0028] like Figures 4-5 As shown, the nozzle 322 is hollow, with a wire mesh 3221 at the outlet. A perforated plate 3222 is installed inside the nozzle 322, and a baffle 3223 is installed at the port of the nozzle 322. The baffle 3223 is connected to the perforated plate 3222 via a spring rod 3224, and the baffle 3223 movably abuts against the port of the nozzle 322. Specifically, in this embodiment, the nozzle 322 is a cylindrical metal tube connected to the housing 321 via a threaded connection. After the absorbent liquid passes through the inlet pipe 31 and the housing 321, it is sprayed out from the port of the nozzle 322. The mesh-like wire mesh 3221 at the outlet of the nozzle 322 can disperse the water column into fine water columns or even mist, increasing the contact area with the exhaust gas. A perforated plate 3222 is installed in the middle of the nozzle 322, which is connected to the baffle 3223 by a spring rod 3224. The perforated plate 3222 has a small obstruction force on the absorbent liquid flowing in the nozzle 322. When the water column is sprayed out from the port of the nozzle 322, the water column with a certain water pressure acts on the baffle 3223. The spring rod 3224 is stretched from its natural state, so that the baffle 3223 is separated from the port of the nozzle 322. The water column hits the baffle 3223 and can be completely dispersed into a mist, increasing the contact reaction area with the exhaust gas and improving the cooling, absorption and purification effect of the exhaust gas. When the absorbent stops spraying, the force acting on the baffle 3223 disappears, and the spring rod 3224 returns from the stretched state, causing the baffle 3223 to re-seal the port of the nozzle 322, preventing the residual exhaust gas in the spray tower 1 from entering the nozzle 322. Over time, the exhaust gas adheres to and blocks the port of the nozzle 322, causing the absorbent to be unable to spray normally. It is necessary to replace the nozzle 322 or increase the cleaning and maintenance frequency, which increases the operating cost.

[0029] like Figures 4-5 As shown, the baffle 3223 is umbrella-shaped, with its arched surface facing the port of the nozzle 322. The baffle 3223 has a notch on its edge, which disperses the water column to form a wider mist surface area and has a better spray absorption effect on the exhaust gas.

[0030] like Figure 1As shown, the system includes an adsorption tower 2, with the other end of an outlet pipe 13 connected to the lower end of the adsorption tower 2, used for physical adsorption of the exhaust gas after spray treatment. Inside the adsorption tower 2, a first adsorption plate 21, a second adsorption plate 22, and a third adsorption plate 23 are spaced apart from bottom to top. This spacing reduces the overall thickness of the layer. Furthermore, the first adsorption plate 21, the second adsorption plate 22, and the third adsorption plate 23 contain different adsorption materials, facilitating individual replacement of adsorption plates according to their usage status and simplifying subsequent maintenance and repair.

[0031] like Figure 1 As shown, the first adsorption plate 21 includes a first screen 211, a gravel layer 212, and a heat exchange tube 213. The gravel layer 212 is filled within the first screen 211, and the heat exchange tube 213 is embedded within the gravel layer 212. Specifically, when the exhaust gas mixed with water vapor rises in the adsorption tower 2, it first passes through the first adsorption plate 21. The gravel layer 212 has relatively large gaps, which can adsorb and filter larger particles in the exhaust gas. Furthermore, the heat exchange tube 213 comes into contact with the water vapor, exchanging heat and causing the water vapor to condense and liquefy within the gravel layer 212. This prevents the water vapor from being directly discharged and forming a ring of white mist at the inlet of the spray tower 2, which could easily lead to misunderstandings about pollution among surrounding residents and cause panic.

[0032] like Figure 1 As shown, the second adsorption plate 22 includes a second screen 221 and a porous ceramic ball layer 222, with the porous ceramic ball layer 222 filling the second screen 221. The third adsorption plate 23 includes a third screen 231 and activated carbon 232, with the activated carbon 232 filling the third screen 231. The porous ceramic ball layer and activated carbon layer provide a large surface area, making it very easy to absorb and collect impurities, much like a magnetic field where all molecules have mutual attraction. Furthermore, the exhaust gas passes through the heat exchange tube 213 in the first adsorption plate 21, further reducing its temperature to below 40 degrees Celsius. This ensures that the activated carbon layer 232 and the porous ceramic ball layer 222 can properly adsorb and recover the exhaust gas. The moisture content of the exhaust gas after heat exchange through the heat exchange tube 213 is further reduced, resulting in a relative humidity of less than 60%, thus avoiding interference with the absorption of organic gases by the activated carbon.

[0033] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. An asphalt exhaust gas treatment device, including a spray tower, characterized in that: The spray tower includes an air inlet pipe, a tower body, and an air outlet pipe. The air inlet pipe is connected to the lower side of the tower body, and one end of the air outlet pipe is connected to the top of the tower body. The air inlet pipe communicates with the air outlet pipe through the tower body. A spray assembly is installed inside the tower body. A fan and a waste oil purification device are installed at the connection between the air outlet pipe and the tower body. The spray assembly includes a water inlet pipe and several nozzles. The water inlet pipe penetrates the side wall of the tower body. Each nozzle includes a housing and several nozzles. The housing is hollow, and its upper end is detachably connected to the water outlet of the water inlet pipe. The lower end of the housing is spherical. The dry nozzle is detachably installed on the spherical surface at the lower end of the housing. An expansion section is provided at the connection between the air outlet pipe and the tower body. The fan is installed inside the expansion section. The sludge and oil purification device includes a base, heat radiation strips, and oil-absorbing material. The base is hollow and ring-shaped. The upper side of the base facing the fan is inclined towards the center. Several heat radiation strips are evenly spaced along the inclined direction of the upper side of the base. Several oil leakage holes are provided between two heat radiation strips. The oil-absorbing material fills the base and seals the oil leakage holes.

2. The asphalt exhaust gas treatment equipment as described in claim 1, characterized in that: The oil-absorbing material is aluminum silicate fiber cotton.

3. The asphalt exhaust gas treatment equipment as described in claim 1, characterized in that: A groove is provided between the two heat radiation strips, and a plurality of oil leakage holes are provided at intervals within the groove.

4. The asphalt exhaust gas treatment equipment as described in claim 1, characterized in that: The thermal radiation strips are triangular in shape.

5. The asphalt exhaust gas treatment equipment as described in claim 1, characterized in that: The nozzle is hollow, with a wire mesh at the nozzle outlet and a perforated plate inside the nozzle. A baffle is installed at the nozzle port, and the baffle is connected to the perforated plate via a spring rod. The baffle is in movable contact with the nozzle port.

6. The asphalt exhaust gas treatment equipment as described in claim 5, characterized in that: The baffle is umbrella-shaped, and a notch is provided on the edge of the baffle.

7. The asphalt exhaust gas treatment equipment as described in claim 1, characterized in that: It also includes an adsorption tower, with the other end of the outlet pipe connected to the lower end of the adsorption tower. The adsorption tower is provided with a first adsorption plate, a second adsorption plate and a third adsorption plate arranged at intervals from bottom to top.

8. The asphalt tail gas treatment equipment as described in claim 7, characterized in that: The first adsorption plate includes a first screen, a gravel layer and a heat exchange tube, wherein the gravel layer is filled in the first screen and the heat exchange tube is buried in the gravel layer.

9. The asphalt tail gas treatment equipment as described in claim 7, characterized in that: The second adsorption plate includes a second screen and a porous ceramic ball layer, wherein the porous ceramic ball layer fills the second screen.

10. The asphalt tail gas treatment equipment as described in claim 7, characterized in that: The third adsorption plate includes a third screen and activated carbon, with the activated carbon filling the third screen.

Images