Tail gas treatment process and alkali liquor spraying equipment thereof

Abstract

The invention relates to the technical field of tail gas treatment, and particularly discloses a tail gas treatment process and alkali liquor spraying equipment thereof. Comprising a round liquid passing shell, a bottom round rod is fixedly connected to the bottom of the round liquid passing shell, an outer connecting round rod is fixedly connected to the outer side of the bottom round rod, an annular connecting plate is fixedly connected to the end, away from the bottom round rod, of the outer connecting round rod, a first liquid passing round hole is formed in the top of the annular connecting plate, and annular sponge is fixedly connected to the bottom of the annular connecting plate; the bottom of the bottom round rod is fixedly connected with a bottom round plate, the top of the bottom round plate is provided with a second liquid passing round hole, and the bottom of the bottom round plate is fixedly connected with a round sponge. And the situation that part of the tail gas flows upwards and is exhausted from the exhaust pipe to influence the treatment effect when the tail gas filled into the circular empty shell is too much and does not fully contact and react with the sprayed alkali liquor is prevented.

Description

Technical Field

[0001] The present invention relates to the technical field of tail gas treatment, and specifically to a tail gas treatment process and its lye spraying equipment. Background Art

[0002] Tail gas treatment refers to the treatment of pollutants such as industrial waste gas and automobile exhaust to reduce their harm to the environment and human health. Asphalt also generates waste gas during production. Asphalt tail gas includes combustible gas, sulfide gas, cyanide gas, odor gas, dust, etc. Asphalt tail gas will cause great harm to human health. Particulates, sulfur dioxide, nitrogen oxides, etc. in asphalt tail gas will stimulate the respiratory tract, causing symptoms such as coughing, asthma, and difficulty breathing. Therefore, asphalt tail gas needs to be treated. The treatment process of asphalt tail gas includes induced draft fan drainage, cooling, oil-gas separation, lye, activated carbon, and photo-oxygen deodorization. The lye here refers to lye spraying, mainly using the acid-base neutralization reaction. The acidic gas in the waste gas reacts chemically with the sprayed lye to generate corresponding salts and water, thereby removing the acidic gas from the waste gas. When the lye is sprayed, it will quickly fall to the bottom of the inner wall of the spray tower. When there is a large amount of tail gas entering from the bottom of the spray tower, a part of the tail gas will pass by the quickly falling lye, resulting in a short reaction time and difficult to fully react, affecting the treatment effect. Therefore, we propose a tail gas treatment process and its lye spraying equipment. Summary of the Invention

[0003] To solve the above technical problems, the present invention provides a tail gas treatment process and its lye spraying equipment, including the following steps: S1: Induced draft fan drainage. Through the negative pressure generated by the induced draft fan, the tail gas generated during the asphalt production process is collected and introduced into the cooling system. S2: Tail gas cooling. The temperature of the tail gas is reduced by using a heat exchanger or water spray cooling method. S3: Oil-gas separation. The oil mist and water vapor in the cooled tail gas are separated by using a cyclone separator, wire mesh demister, or electrostatic oil remover equipment. S4: Lye spraying. The tail gas after oil-gas separation enters the lye spraying equipment. Through the lye spraying equipment, the lye reacts with the acidic gas to generate corresponding salts and water, thereby removing the acidic gas from the tail gas. S5: Activated carbon adsorption. The tail gas treated with lye contacts the activated carbon to adsorb the residual organic pollutants in the tail gas, including various hydrocarbons and benzene series compounds, so that the tail gas is deeply purified and the emission concentration of organic pollutants is reduced. S6: Photo-oxygen deodorization. The tail gas after activated carbon adsorption treatment is deodorized by using photo-oxidation technology to decompose the odor substances in the tail gas and improve the air quality.

[0004] The lye spraying device includes a circular empty shell. A spraying device is fixedly connected to the top of the circular empty shell. A high-pressure circulation pump is communicated with the top of the spraying device. A concave connecting pipe is communicated with the top of the high-pressure circulation pump. A drain pipe is communicated with the bottom of the concave connecting pipe. An air inlet pipe is communicated with the bottom of the circular empty shell. An air outlet pipe is communicated with the part of the circular empty shell near the top on the outside. A driving motor is fixedly connected to the center of the bottom of the circular empty shell. The driving shaft of the driving motor penetrates through the circular empty shell and is fixedly connected with a cleaning device. Bottom support columns are fixedly connected to the bottom of the circular empty shell; The spraying device includes a circular liquid passing shell. A bottom circular rod is fixedly connected to the bottom of the circular liquid passing shell. An outer connecting circular rod is fixedly connected to the outside of the bottom circular rod. An annular connecting plate is fixedly connected to the end of the outer connecting circular rod away from the bottom circular rod. A liquid passing round hole one is opened at the top of the annular connecting plate. An annular sponge is fixedly connected to the bottom of the annular connecting plate; One end of the concave connecting pipe away from the high-pressure circulation pump is communicated with the bottom of the circular empty shell. The bottom of the cleaning device is rotationally connected to the inner wall of the circular empty shell through a rotating bolt; The circular liquid passing shell is set as a circular shell with a circular cavity inside and circular spraying holes opened at the bottom. The bottom of the circular liquid passing shell is fixedly connected to the top of the circular empty shell. There are multiple liquid passing round holes one, and the multiple liquid passing round holes one are distributed on the annular connecting plate; A bottom circular plate is fixedly connected to the bottom of the bottom circular rod. A liquid passing round hole two is opened at the top of the bottom circular plate. By respectively arranging the liquid passing round hole one and the liquid passing round hole two on the annular connecting plate and the bottom circular plate that are aligned with the spraying holes opened at the bottom of the circular liquid passing shell, the sprayed lye is directly injected into the sponge under a certain pushing force, preventing the sprayed lye from directly contacting the surfaces of the annular connecting plate and the bottom circular plate, resulting in the situation that when the sponge reaches the absorption saturation state, it is difficult for the lye to effectively penetrate into the interior of the sponge. A circular sponge is fixedly connected to the bottom of the bottom circular plate. By arranging the annular sponge and the circular sponge immersed in the lye to carry out an inhalation type full reaction on the tail gas, preventing when there is a large amount of tail gas filled into the circular empty shell, a part of the tail gas flows upward and is discharged from the exhaust pipe without fully contacting and reacting with the sprayed lye, affecting the treatment effect. By spraying, the lye fills the interiors of the annular sponge and the circular sponge, making the tail gas only contact and react with the lye on the surface of the sponge and difficult to enter the interior. Preventing a large amount of tail gas from entering the interior of the sponge and reacting with the lye, the produced reactants accumulate in the interior of the sponge and are difficult to treat, affecting the use effect of the sponge. By separately arranging the annular sponge and the circular sponge at the bottom of the circular liquid passing shell, it is convenient for the tail gas to have enough area to continue flowing upward after the neutralization reaction. Preventing when a circular sponge with the same outer diameter as the annular connecting plate is directly arranged at the bottom of the circular liquid passing shell, the reacted tail gas is difficult to effectively flow upward, resulting in a part of the tail gas being squeezed into the interior of the sponge and affecting the subsequent neutralization effect; A plurality of the second liquid passage round holes are provided, and the plurality of the second liquid passage round holes are distributed on the bottom circular plate.

[0005] Further, the cleaning device includes a vertical scraping rod. The vertical scraping rod that rotates with the guiding and feeding mechanism scrapes the inner wall of the circular empty shell to prevent a large amount of reaction residues from adhering to the inner wall of the circular empty shell after long-term use, which is difficult to remove and affects the subsequent tail gas treatment effect. One side of the vertical scraping rod is fixedly connected to the guiding and feeding mechanism. A top scraping rod is fixedly connected to a position near the top on one side of the vertical scraping rod. When the top scraping rod rotates with the vertical scraping rod, it scrapes the bottom surface of the circular liquid passage shell to prevent reaction residues from accumulating at the bottom of the circular liquid passage shell after long-term use and blocking the spraying holes, affecting the spraying effect. A triangular scraping block one is fixedly connected to one side of the vertical scraping rod. A curved scraping rod is fixedly connected to one side of the vertical scraping rod. A side connecting round rod is fixedly connected to one side of the vertical scraping rod. The end of the side connecting round rod far from the vertical scraping rod is fixedly connected to a concave scraping rod. When the curved scraping rod and the concave scraping rod rotate, they respectively scrape the outer surfaces of the annular sponge and the circular sponge to prevent an excessive amount of residues from gradually accumulating on the surfaces of the annular sponge and the circular sponge after long-term use, covering the sponge surface and affecting the contact effect between the tail gas and the sponge. A triangular scraping block two is fixedly connected to the top of the concave scraping rod. When the triangular scraping block one and the triangular scraping block two rotate, they respectively scrape the annular connecting plate and the top surface of the bottom circular plate to prevent a part of the residues flowing upward with the tail gas from continuously accumulating on the annular connecting plate and the bottom circular plate, blocking the first liquid passage round hole and the second liquid passage round hole and affecting the immersion of the lye into the sponge. The bottom of the guiding and feeding mechanism is fixedly connected to the driving shaft of the driving motor. Two vertical scraping rods are provided, and the two vertical scraping rods are distributed on both sides of the guiding and feeding mechanism. Two triangular scraping blocks one are provided, and the two triangular scraping blocks one are distributed at positions on one side of the vertical scraping rod below the top scraping rod. Two curved scraping rods are provided, and the two curved scraping rods are distributed at positions on one side of the vertical scraping rod below the triangular scraping block one. Two side connecting round rods are provided, and the two side connecting round rods are distributed at positions on one side of the vertical scraping rod below the curved scraping rod.

[0006] Furthermore, the guiding and pushing mechanism includes a triangular scraper. When the triangular scraper rotates, it scrapes the bottom of the inner wall of the circular empty shell, and through its inclined surface, the scraped residues are separated from the bottom of the inner wall of the circular empty shell, preventing the cleaning difficulty from increasing and affecting the cleaning effect when residues accumulate on the bottom of the inner wall of the circular empty shell for a long time. At the middle position on one side of the triangular scraper, there is a fixed connection with a first middle inclined plate. At the middle position on one side of the triangular scraper, there is a fixed connection with a second middle inclined plate. On one side of the second middle inclined plate, there is a fixed connection with a triangular inclined plate. When the triangular inclined plate rotates along with the first middle inclined plate and the second middle inclined plate, it pushes the residues between the first middle inclined plate and the second middle inclined plate to gradually move upward along its inclined surface and cross over the triangular inclined plate and fall on the triangular scraper, preventing a part of the residues pushed by the second middle inclined plate between the first middle inclined plate and the second middle inclined plate from continuously accumulating and being difficult to smoothly drain from the drain port into the concave connecting pipe. On one side of the triangular scraper, there is a fixed connection with a first inclined plate. On the side of the triangular scraper close to the first inclined plate, there is a fixed connection with a second inclined plate. By means of the first middle inclined plate, the second middle inclined plate, the first inclined plate, and the second inclined plate, the residues at the bottom of the inner wall of the circular empty shell are pushed to move to the drain port close to the concave connecting pipe for easy discharge, preventing excessive residues from still accumulating at the position where there is no drain port at the bottom of the inner wall of the circular empty shell and being difficult to discharge, which affects the subsequent tail gas treatment effect. When the residues are pushed to rotate through the inclined surface settings of the first middle inclined plate, the second middle inclined plate, the first inclined plate, and the second inclined plate, they move back and forth between the center square and the outer side direction at the bottom of the inner wall of the circular empty shell, which is convenient for the residues to move to the position of the drain port for discharge, preventing some residues close to the center direction and the outer side direction of the circular empty shell from being far away from the drain port and always being difficult to be smoothly discharged to the position of the drain port through pushing. The bottom of the triangular scraper is fixedly connected to the drive shaft of the drive motor. One side of the triangular scraper is fixedly connected to one side of the vertical scraper rod. There are two first middle inclined plates, and the two first middle inclined plates are symmetrically distributed about the center on both sides of the triangular scraper. There are two second middle inclined plates, and the two second middle inclined plates are symmetrically distributed about the center on both sides of the triangular scraper. One side of the first middle inclined plate is fixedly connected to one side of the triangular inclined plate. There are multiple first inclined plates, and the multiple first inclined plates are symmetrically distributed about the center on both sides of the triangular scraper. There are multiple second inclined plates, and the multiple second inclined plates are symmetrically distributed about the center on both sides of the triangular scraper.

[0007] The present invention provides a tail gas treatment process and its lye spraying device. It has the following beneficial effects: 1. The tail gas treatment process and its lye spraying equipment suck in and fully react with the tail gas by arranging an annular sponge and a circular sponge immersed in the lye, preventing the situation that when there is a large amount of tail gas filled into the circular shell, some tail gas flows upward and is discharged from the exhaust pipe without fully contacting and reacting with the sprayed lye, which affects the treatment effect. The vertical scraping rod rotating with the guiding and pushing mechanism scrapes and cleans the inner wall of the circular shell to prevent a large amount of reaction residues from adhering to the inner wall of the circular shell after long-term use, which is difficult to remove and affects the subsequent tail gas treatment effect. The residues at the bottom of the inner wall of the circular shell are pushed by the middle inclined plate 1, middle inclined plate 2, first inclined plate and second inclined plate to move to the liquid discharge port near the concave connecting pipe for easy discharge, preventing excessive residues from still accumulating at the position where the liquid discharge port is not opened at the bottom of the inner wall of the circular shell, which is difficult to discharge and affects the subsequent tail gas treatment effect.

[0008] 2. The tail gas treatment process and its lye spraying equipment are provided with a spraying device. The tail gas is sucked in and fully reacted by arranging an annular sponge and a circular sponge immersed in the lye, preventing the situation that when there is a large amount of tail gas filled into the circular shell, some tail gas flows upward and is discharged from the exhaust pipe without fully contacting and reacting with the sprayed lye, which affects the treatment effect. By respectively arranging a liquid passing round hole 1 and a liquid passing round hole 2 on the annular connecting plate and the bottom circular plate, which are aligned with the spraying holes opened at the bottom of the circular liquid passing shell, the sprayed lye is directly injected into the sponge under a certain pushing pressure, preventing the sprayed lye from directly contacting the surfaces of the annular connecting plate and the bottom circular plate, resulting in the situation that when the sponge reaches the absorption saturation state, it is difficult for the lye to effectively penetrate into the interior of the sponge. The interior of the annular sponge and the circular sponge is filled with lye through spraying, so that the tail gas only contacts and reacts with the lye on the surface of the sponge and is difficult to enter the interior, preventing a large amount of tail gas from entering the interior of the sponge and reacting with the lye, and the reactants produced are accumulated in the interior of the sponge and are difficult to treat, which affects the use effect of the sponge. By separately arranging the annular sponge and the circular sponge at the bottom of the circular liquid passing shell, it is convenient for the tail gas to continue to flow upward in a sufficient area after the neutralization reaction, preventing the situation that when a circular sponge with the same outer diameter as the annular connecting plate is directly arranged at the bottom of the circular liquid passing shell, the reacted tail gas is difficult to effectively flow upward, resulting in some tail gas being squeezed into the interior of the sponge, which affects the subsequent neutralization effect.

[0009] 3. The tail gas treatment process and its lye spraying device are provided with a cleaning device. The vertical scraping rod that rotates with the guiding and pushing mechanism scrapes the inner wall of the circular empty shell to prevent a large amount of reaction residues from adhering to the inner wall of the circular empty shell after long-term use, which is difficult to remove and affects the subsequent tail gas treatment effect. When the top scraping rod rotates with the vertical scraping rod, it scrapes the bottom surface of the circular liquid passing shell to prevent the reaction residues from accumulating at the bottom of the circular liquid passing shell after long-term use and blocking the spraying holes, which affects the spraying effect. When the triangular scraping block 1 and the triangular scraping block 2 rotate, they respectively scrape the top surfaces of the annular connecting plate and the bottom circular plate to prevent a part of the residues flowing upward with the tail gas from continuously accumulating on the annular connecting plate and the bottom circular plate, blocking the liquid passing round holes 1 and 2 and affecting the immersion of lye into the sponge. When the curved scraping rod and the concave scraping rod rotate, they respectively scrape the outer surfaces of the annular sponge and the circular sponge to prevent the surfaces of the annular sponge and the circular sponge from gradually accumulating too many residues after long-term use, covering the sponge surface and affecting the contact effect between the tail gas and the sponge.

[0010] 4. The tail gas treatment process and its lye spraying device are provided with a guiding and pushing mechanism. When the triangular scraper rotates, it scrapes the bottom of the inner wall of the circular empty shell, and through its inclined surface, the scraped residues are separated from the bottom of the inner wall of the circular empty shell, preventing the residues from accumulating at the bottom of the inner wall of the circular empty shell for a long time, increasing the cleaning difficulty and affecting the cleaning effect. Through the middle inclined plate 1, the middle inclined plate 2, the first inclined plate and the second inclined plate, the residues at the bottom of the inner wall of the circular empty shell are pushed to move towards the drain opening near the concave connecting pipe for easy discharge, preventing too many residues from still accumulating at the position where the drain opening is not opened at the bottom of the inner wall of the circular empty shell, which is difficult to discharge and affects the subsequent tail gas treatment effect. When the residues are pushed to rotate through the inclined surface settings of the middle inclined plate 1, the middle inclined plate 2, the first inclined plate and the second inclined plate, they move back and forth between the center square and the outer side direction at the bottom of the inner wall of the circular empty shell for easy movement of the residues to the position of the drain opening for discharge, preventing some residues near the center direction and the outer side direction of the circular empty shell from being far away from the drain opening and always being difficult to be smoothly discharged to the position of the drain opening through pushing. When the triangular inclined plate rotates with the middle inclined plate 1 and the middle inclined plate 2, it pushes the residues between the middle inclined plate 1 and the middle inclined plate 2 to gradually move upward along its inclined surface and cross the triangular inclined plate to fall on the triangular scraper, preventing some residues pushed to between the middle inclined plate 1 and the middle inclined plate 2 by the middle inclined plate 2 from continuously accumulating and being difficult to be smoothly discharged from the drain opening to the concave connecting pipe. Description of the Drawings

[0011] Figure 1 It is a schematic diagram of the tail gas treatment process of the present invention; Figure 2 It is a schematic diagram of the structure of the lye spraying device of the present invention; Figure 3 It is a schematic diagram of the bottom side sectional structure of the lye spraying device of the present invention; Figure 4 Schematic diagram of the partial side-sectional structure of the spray device of the present invention; Figure 5 Schematic diagram of the bottom structure of the spray device of the present invention; Figure 6 Schematic diagram of the partial structure of the cleaning device of the present invention; Figure 7 Schematic diagram of the overall structure of the cleaning device of the present invention; Figure 8 Schematic diagram of the structure of the guiding and pushing mechanism of the present invention; Figure 9 Schematic diagram of the bottom structure of the guiding and pushing mechanism of the present invention.

[0012] In the figure: 1, circular empty shell; 2, spray device; 3, high-pressure circulation pump; 4, concave connecting pipe; 5, drain pipe; 6, intake pipe; 7, outlet pipe; 8, drive motor; 9, cleaning device; 10, bottom support column; 201, circular liquid-passing shell; 202, bottom circular rod; 203, outer connecting circular rod; 204, annular connecting plate; 205, first circular liquid-passing hole; 206, annular sponge; 207, bottom circular plate; 208, second circular liquid-passing hole; 209, circular sponge; 901, vertical scraping rod; 902, guiding and pushing mechanism; 903, top scraping rod; 904, first triangular scraping block; 905, curved scraping rod; 906, side connecting circular rod; 907, concave scraping rod; 908, second triangular scraping block; 9021, triangular scraping plate; 9022, first middle inclined plate; 9023, second middle inclined plate; 9024, triangular inclined plate; 9025, first inclined plate; 9026, second inclined plate. Detailed implementation manners

[0013] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0014] Please refer to Figures 1 - 5 , the present invention provides a tail gas treatment process and its lye spraying equipment, including the following steps: S1: Draft by the induced draft fan. Through the negative pressure generated by the induced draft fan, the tail gas generated during the asphalt production process is collected and introduced into the cooling system; S2: Tail gas cooling. The temperature of the tail gas is reduced by using a heat exchanger or a water spraying cooling method; S3: Oil-gas separation. The oil mist and water vapor in the cooled tail gas are separated by using a cyclone separator, a wire mesh demister or an electrostatic oil remover device; S4: Alkaline solution spraying. The tail gas after oil-gas separation enters the alkaline solution spraying equipment. Through the alkaline solution spraying equipment, a neutralization reaction occurs between the alkaline solution and the acidic gas, generating corresponding salts and water, thereby removing the acidic gas from the tail gas. S5: Activated carbon adsorption. The tail gas treated with alkaline solution contacts the activated carbon to adsorb the residual organic pollutants in the tail gas, including various hydrocarbons and benzene series compounds, so as to deeply purify the tail gas and reduce the emission concentration of organic pollutants. S6: Photo-oxidation deodorization. The tail gas after activated carbon adsorption treatment is deodorized by using photo-oxidation technology to decompose the odor substances in the tail gas and improve the air quality.

[0015] The alkaline solution spraying equipment includes a circular empty shell 1. The top of the circular empty shell 1 is fixedly connected with a spraying device 2. The top of the spraying device 2 is communicated with a high-pressure circulation pump 3. The top of the high-pressure circulation pump 3 is communicated with a concave connecting pipe 4. The bottom of the concave connecting pipe 4 is communicated with a drain pipe 5. The bottom of the circular empty shell 1 is communicated with an air inlet pipe 6. The part of the circular empty shell 1 near the top on the outside is communicated with an air outlet pipe 7. The center of the bottom of the circular empty shell 1 is fixedly connected with a driving motor 8. The driving shaft of the driving motor 8 penetrates the circular empty shell 1 and is fixedly connected with a cleaning device 9. The bottom of the circular empty shell 1 is fixedly connected with a bottom support column 10. The spraying device 2 includes a circular liquid passing shell 201. The bottom of the circular liquid passing shell 201 is fixedly connected with a bottom circular rod 202. The outside of the bottom circular rod 202 is fixedly connected with an outer connecting circular rod 203. One end of the outer connecting circular rod 203 away from the bottom circular rod 202 is fixedly connected with an annular connecting plate 204. A liquid passing round hole one 205 is opened at the top of the annular connecting plate 204. The bottom of the annular connecting plate 204 is fixedly connected with an annular sponge 206. One end of the concave connecting pipe 4 away from the high-pressure circulation pump 3 is communicated with the bottom of the circular empty shell 1. The bottom of the cleaning device 9 is rotationally connected with the inner wall of the circular empty shell 1 through a rotating bolt. The circular liquid passing shell 201 is set as a circular shell with a circular cavity inside and circular spraying holes opened at the bottom. The bottom of the circular liquid passing shell 201 is fixedly connected with the top of the circular empty shell 1. There are multiple liquid passing round holes one 205, and the multiple liquid passing round holes one 205 are distributed on the annular connecting plate 204. The bottom of the bottom circular rod 202 is fixedly connected with a bottom circular plate 207. A liquid passing round hole two 208 is opened at the top of the bottom circular plate 207. The bottom of the bottom circular plate 207 is fixedly connected with a circular sponge 209. There are multiple liquid - passing round holes II 208, and the multiple liquid - passing round holes II 208 are distributed on the bottom - placed round plate 207. During use, start the driving motor 8 to drive the cleaning device 9 to rotate to a position where it does not block the air inlet pipe 6 and the concave - shaped connecting pipe 4. At this time, fill the circular empty shell 1 with tail gas from the air inlet pipe 6. The tail gas entering the circular empty shell 1 flows upward and contacts the spraying device 2 for a neutralization reaction with the alkali solution. The tail gas after reacting with the alkali solution continues to flow upward and is discharged outward through the air outlet pipe 7. At the same time, the high - pressure circulation pump 3 can pump the alkali solution that has fallen to the bottom of the inner wall of the circular empty shell 1 back into the spraying device 2 through the concave - shaped connecting pipe 4 for reuse. After the alkali solution is reused multiple times, the salt and water generated after multiple reactions of the alkali solution in the circular empty shell 1 can be discharged through the drain pipe 5. At the same time, drive the cleaning device 9 to rotate through the driving motor 8 to clean the residues on the inner wall of the circular empty shell 1 and the surface of the spraying device 2 and discharge them outward through the drain pipe 5. After the reaction products are completely discharged, the drain pipe 5 can be docked with the alkali solution tank, and the alkali solution can be pumped into the spraying device 2 again through the high - pressure circulation pump 3 for use. The tail gas entering the circular empty shell 1 from the air inlet pipe 6 flows upward and contacts the circular sponge 209 and the annular sponge 206 in sequence, and finally flows upward through the inside of the inner side of the annular connecting plate 204 and is discharged from the exhaust pipe. The high - pressure circulation pump 3 pumps the alkali solution in the concave - shaped connecting pipe 4 into the circular liquid - passing shell 201 and sprays it evenly downward through the circular liquid - passing shell 201. The alkali solution sprayed from the bottom of the circular liquid - passing shell 201 falls on the annular connecting plate 204 and the bottom - placed round plate 207, and penetrates into the annular sponge 206 and the circular sponge 209 respectively through the liquid - passing round hole I 205 and the liquid - passing round hole II 208. The tail gas flowing upward and contacting the annular sponge 206 and the circular sponge 209 will enter the inside of the sponge for a neutralization reaction with the alkali solution. By setting the immersed annular sponge 206 and circular sponge 209 in the alkali solution, a suction - type full reaction of the tail gas is carried out. By respectively setting the liquid - passing round hole I 205 and the liquid - passing round hole II 208 on the annular connecting plate 204 and the bottom - placed round plate 207 that are aligned with the spraying holes opened at the bottom of the circular liquid - passing shell 201, the sprayed alkali solution is directly injected into the sponge under a certain pushing force. Through spraying, the alkali solution fills the inside of the annular sponge 206 and the circular sponge 209, making it difficult for the tail gas to enter the inside and only contact and react with the alkali solution on the surface of the sponge. By separately arranging the annular sponge 206 and the circular sponge 209 at the bottom of the circular liquid - passing shell 201, there is enough area for the tail gas to continue to flow upward after the neutralization reaction.

[0016] Please refer to Figures 1 - 9, the present invention provides an exhaust gas treatment process and its lye spraying device: The cleaning device 9 includes a vertical scraping rod 901, on one side of the vertical scraping rod 901 is fixedly connected a guiding and pushing mechanism 902, at a position near the top on one side of the vertical scraping rod 901 is fixedly connected a top scraping rod 903, on one side of the vertical scraping rod 901 is fixedly connected a triangular scraping block one 904, on one side of the vertical scraping rod 901 is fixedly connected a curved scraping rod 905, on one side of the vertical scraping rod 901 is fixedly connected a side connecting round rod 906, at the end of the side connecting round rod 906 away from the vertical scraping rod 901 is fixedly connected a concave scraping rod 907, at the top of the concave scraping rod 907 is fixedly connected a triangular scraping block two 908, the bottom of the guiding and pushing mechanism 902 is fixedly connected to the driving shaft of the driving motor 8, there are two vertical scraping rods 901, and the two vertical scraping rods 901 are distributed on both sides of the guiding and pushing mechanism 902, there are two triangular scraping blocks one 904, and the two triangular scraping blocks one 904 are distributed at a position on one side of the vertical scraping rod 901 below the top scraping rod 903, there are two curved scraping rods 905, and the two curved scraping rods 905 are distributed at a position on one side of the vertical scraping rod 901 below the triangular scraping block one 904, there are two side connecting round rods 906, and the two side connecting round rods 906 are distributed at a position on one side of the vertical scraping rod 901 below the curved scraping rod 905; The guide pushing mechanism 902 includes a triangular scraper 9021, a central inclined plate 9022 is fixedly connected to the middle of one side of the triangular scraper 9021, a central inclined plate 9023 is fixedly connected to the middle of one side of the triangular scraper 9021, a triangular inclined plate 9024 is fixedly connected to one side of the central inclined plate 9023, a first inclined plate 9025 is fixedly connected to one side of the triangular scraper 9021, a second inclined plate 9026 is fixedly connected to the side of the triangular scraper 9021 close to the first inclined plate 9025, the bottom of the triangular scraper 9021 is fixedly connected to the drive shaft of the drive motor 8, one side of the triangular scraper 9021 is fixedly connected to one side of the vertical scraper rod 901, two central inclined plates 9022 are provided, and the two A central inclined plate 9022 is centrally symmetrically distributed on both sides of the triangular scraper 9021, two central inclined plates 9023 are provided, and the two central inclined plates 9023 are centrally symmetrically distributed on both sides of the triangular scraper 9021, one side of the central inclined plate 9022 is fixedly connected to one side of the triangular inclined plate 9024, a plurality of first inclined plates 9025 are provided, and the plurality of first inclined plates 9025 are centrally symmetrically distributed on both sides of the triangular scraper 9021, a plurality of second inclined plates 9026 are provided, and the plurality of second inclined plates 9026 are centrally symmetrically distributed on both sides of the triangular scraper 9021. When in use, when the alkali solution is repeatedly used to replace the alkali solution through the drain pipe 5, the drive motor 8 is started to drive the guide at the top The pushing mechanism 902 rotates, and the guide pushing mechanism 902 rotates to push the residue accumulated at the bottom of the inner wall of the circular empty shell 1 to move toward the discharge port. When the guide pushing mechanism 902 rotates, it drives the vertical scraper rods 901 on both sides to rotate. When the vertical scraper rods 901 rotate, they are in contact with the inner wall of the circular empty shell 1 at all times. As the guide pushing mechanism 902 rotates, the vertical scraper rods 901 scrape and clean the inner wall of the circular empty shell 1. As the guide pushing mechanism 902 rotates, the vertical scraper rods 901 drive the top scraper rods 903, the triangular scraper block 1 904, the curved scraper rods 905, the side round rods 906, the concave scraper rods 907 and the triangular scraper block 2 908 on one side to rotate together. When the top scraper rods 903 rotate with the vertical scraper rods 901 The bottom surface of the circular liquid-passing shell 201 is scraped and cleaned. When the triangular scraper block 1 904 and the triangular scraper block 2 908 rotate, the top surfaces of the annular connecting plate 204 and the bottom circular plate 207 are scraped and cleaned respectively. When the curved scraper rod 905 and the concave scraper rod 907 rotate, the outer surfaces of the annular sponge 206 and the circular sponge 209 are scraped and cleaned respectively. When the residue needs to be discharged outward through the drain pipe 5, the driving motor 8 is started to drive the triangular scraper 9021 on the top to rotate. When the triangular scraper 9021 rotates, it scrapes the bottom of the inner wall of the circular empty shell 1 and makes the scraped residue separate from the bottom of the inner wall of the circular empty shell 1 through its inclined surface. When the triangular scraper 9021 rotates, it drives the vertical scrapers 901 on both sides to rotate.Meanwhile, the triangular scraping rod will also drive the middle inclined plate one 9022, middle inclined plate two 9023, triangular inclined plate 9024, first inclined plate 9025 and second inclined plate 9026 adjacent to both sides of the vertical scraping rod 901 to rotate together. When the middle inclined plate two 9023 and the first inclined plate 9025 rotate clockwise with the triangular scraping plate 9021, they push the residue to move along its inclined surface towards the center of the triangular scraping plate 9021. The residue that moves onto the triangular scraping plate 9021 through the first inclined plate 9025 contacts the middle inclined plate one 9022 and the second inclined plate 9026 on the opposite side and moves along their inclined surfaces towards the outside of the circular shell 1. The residue at the bottom of the inner wall of the circular shell 1 is pushed by the middle inclined plate one 9022, middle inclined plate two 9023, first inclined plate 9025 and second inclined plate 9026 to move closer to the drain port of the concave connecting pipe 4 for discharge. Through the inclined surface settings of the middle inclined plate one 9022, middle inclined plate two 9023, first inclined plate 9025 and second inclined plate 9026, when the residue is pushed to rotate, it moves back and forth between the center square and the outer side near the bottom of the inner wall of the circular shell 1, facilitating the movement of the residue to the position of the drain port for discharge. When the middle inclined plate two 9023 rotates with the triangular scraping plate 9021, it guides the pushed residue between the middle inclined plate one 9022 and the middle inclined plate two 9023. When the middle inclined plate two 9023 and the middle inclined plate one 9022 rotate, they drive the triangular inclined plate 9024 between them to rotate together. When the triangular inclined plate 9024 rotates with the middle inclined plate one 9022 and the middle inclined plate two 9023, it pushes the residue between the middle inclined plate one 9022 and the middle inclined plate two 9023 to gradually move upward along its inclined surface and cross over the triangular inclined plate 9024 and fall onto the triangular scraping plate 9021.,

[0017] When the present invention is in operation, the driving motor 8 is started to drive the cleaning device 9 to rotate to a position where the air inlet pipe 6 and the concave connecting pipe 4 are not blocked. At this time, the tail gas is filled into the circular empty shell 1 from the air inlet pipe 6. The tail gas entering the circular empty shell 1 flows upward and contacts the spraying device 2 for neutralization reaction with the lye. The tail gas after reacting with the lye continues to flow upward and is discharged outward through the air outlet pipe 7. At the same time, the high-pressure circulating pump 3 can draw the lye falling from the bottom of the inner wall of the circular empty shell 1 back into the spraying device 2 through the concave connecting pipe 4 for repeated use. After the lye is repeatedly used for many times, the salt and water generated after the lye reacts many times in the circular empty shell 1 can be discharged through the drain pipe 5. At the same time, the cleaning device 9 is driven by the driving motor 8 to rotate to clean the residues on the inner wall of the circular empty shell 1 and the surface of the spraying device 2 and discharge them outward through the drain pipe 5. After the reaction products are completely discharged, the drain pipe 5 can be connected to the lye tank, and the lye can be drawn into the spraying device 2 again by the high-pressure circulating pump 3 for use. The tail gas entering the circular empty shell 1 from the air inlet pipe 6 flows upward and contacts the circular sponge 209 and the annular sponge 206 in sequence, and finally flows upward through the inner side of the annular connecting plate 204 and is discharged from the exhaust pipe. The high-pressure circulating pump 3 draws the lye in the concave connecting pipe 4 into the circular liquid passing shell 201 and sprays it evenly to the bottom through the circular liquid passing shell 201. The lye sprayed from the bottom of the circular liquid passing shell 201 falls on the annular connecting plate 204 and the bottom circular plate 207, and penetrates into the annular sponge 206 and the circular sponge 209 respectively through the liquid passing round hole 1 205 and the liquid passing round hole 2 208. The tail gas flowing upward and contacting the annular sponge 206 and the circular sponge 209 will enter the inside of the sponge for neutralization reaction with the lye. By arranging the annular sponge 206 and the circular sponge 209 immersed in the lye, the tail gas can be fully reacted in a suction manner. By respectively arranging the liquid passing round hole 1 205 and the liquid passing round hole 2 208 on the annular connecting plate 204 and the bottom circular plate 207 that are aligned with the spraying holes opened at the bottom of the circular liquid passing shell 201, the sprayed lye is directly injected into the sponge under a certain pushing force. Through spraying, the inside of the annular sponge 206 and the circular sponge 209 is filled with the lye, so that the tail gas can only contact and react with the lye on the surface of the sponge and is difficult to enter the inside. By separately arranging the annular sponge 206 and the circular sponge 209 at the bottom of the circular liquid passing shell 201, it is convenient for the tail gas to have enough area to continue flowing upward after the neutralization reaction. When the lye is replaced through the drain pipe 5 after being repeatedly used many times, the driving motor 8 is started to drive the guiding and pushing mechanism 902 at the top to rotate. The guiding and pushing mechanism 902 rotates to push the residues accumulated at the bottom of the inner wall of the circular empty shell 1 towards the drain port. When the guiding and pushing mechanism 902 rotates, the vertical scraping rods 901 on both sides are driven to rotate. When the vertical scraping rods 901 rotate, they are always in contact with the inner wall of the circular empty shell 1. The vertical scraping rods 901 rotating with the guiding and pushing mechanism 902 scrape and clean the inner wall of the circular empty shell 1.When the vertical scraping rod 901 rotates with the guiding and feeding mechanism 902, it drives the overhead scraping rod 903, the first triangular scraping block 904, the curved scraping rod 905, the side-connected round rod 906, the concave scraping rod 907, and the second triangular scraping block 908 on one side to rotate together. When the overhead scraping rod 903 rotates with the vertical scraping rod 901, it performs scraping and cleaning on the bottom surface of the circular liquid-conducting shell 201. When the first triangular scraping block 904 and the second triangular scraping block 908 rotate, they respectively perform scraping and cleaning on the top surfaces of the annular connecting plate 204 and the bottom circular plate 207. When the curved scraping rod 905 and the concave scraping rod 907 rotate, they respectively perform scraping and cleaning on the outer surfaces of the annular sponge 206 and the circular sponge 209. When it is necessary to discharge the residues through the drain pipe 5, the driving motor 8 is started to drive the triangular scraper 9021 at the top to rotate. When the triangular scraper 9021 rotates, it scrapes the bottom of the inner wall of the circular empty shell 1 and makes the scraped residues separate from the bottom of the inner wall of the circular empty shell 1 through its inclined surface. When the triangular scraper 9021 rotates, it drives the vertical scraping rods 901 on both sides to rotate. At the same time, the triangular scraping rod also drives the first middle inclined plate 9022, the second middle inclined plate 9023, the triangular inclined plate 9024, the first inclined plate 9025, and the second inclined plate 9026 on the adjacent sides of the vertical scraping rod 901 to rotate together. When the second middle inclined plate 9023 and the first inclined plate 9025 rotate clockwise with the triangular scraper 9021, they push the residues along their inclined surfaces in the direction close to the center of the triangular scraper 9021. The residues that move to the triangular scraper 9021 through the first inclined plate 9025 cross the triangular scraper 9021 and contact the first middle inclined plate 9022 and the second inclined plate 9026 on the opposite side and move in the direction close to the outside of the circular empty shell 1 through their inclined surfaces. The residues at the bottom of the inner wall of the circular empty shell 1 are pushed by the first middle inclined plate 9022, the second middle inclined plate 9023, the first inclined plate 9025, and the second inclined plate 9026 to move close to the drain port of the concave connecting pipe 4 for discharge. Through the inclined surface settings of the first middle inclined plate 9022, the second middle inclined plate 9023, the first inclined plate 9025, and the second inclined plate 9026, when the residues are pushed to rotate, they move back and forth between the center square and the outside direction close to the bottom of the inner wall of the circular empty shell 1, which is convenient for the residues to move to the position of the drain port for discharge. When the second middle inclined plate 9023 rotates with the triangular scraper 9021, it guides the pushed residues to between the first middle inclined plate 9022 and the second middle inclined plate 9023. When the second middle inclined plate 9023 and the first middle inclined plate 9022 rotate, they drive the triangular inclined plate 9024 between them to rotate together. When the triangular inclined plate 9024 rotates with the first middle inclined plate 9022 and the second middle inclined plate 9023, it pushes the residues between the first middle inclined plate 9022 and the second middle inclined plate 9023 to gradually move upward along its inclined surface and cross the triangular inclined plate 9024 and fall on the triangular scraper 9021.,

[0018] Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all embodiments. All other embodiments obtained by those of ordinary skill in the art and related fields based on the embodiments of the present invention without creative efforts shall fall within the scope of protection of the present invention. Structures, devices, and operation methods not specifically described and explained in the present invention, unless otherwise specified and limited, are implemented according to conventional means in the art.

Claims

1. A tail gas treatment process, characterized in that, It includes the following steps: S1: Induced draft fan drainage. Through the negative pressure generated by the induced draft fan, the tail gas generated in the asphalt production process is collected and introduced into the cooling system; S2: Tail gas cooling. The heat exchanger or water spray cooling method is used to reduce the temperature of the tail gas; S3: Oil-gas separation. The oil mist and water vapor in the cooled tail gas are separated by using a cyclone separator, wire mesh demister or electrostatic oil remover equipment; S4: Alkali solution spraying. The tail gas after oil-gas separation enters the alkali solution spraying equipment. Through the alkali solution spraying equipment, the alkali solution reacts with the acidic gas to generate corresponding salts and water, thereby removing the acidic gas from the tail gas; S5: Activated carbon adsorption. The tail gas treated by the alkali solution contacts the activated carbon to adsorb the residual organic pollutants in the tail gas, including hydrocarbons and benzene series, so that the tail gas is deeply purified and the emission concentration of organic pollutants is reduced; S6: Photo-oxygen deodorization. The photo-oxidation technology is used to deodorize the tail gas treated by activated carbon adsorption, decompose the odor substances in the tail gas, and improve the air quality; The alkali solution spraying equipment includes a circular empty shell (1), and a spraying device (2) is fixedly connected to the top of the circular empty shell (1) The spraying device (2) includes a circular liquid passing shell (201). A bottom circular rod (202) is fixedly connected to the bottom of the circular liquid passing shell (201). An outer connecting circular rod (203) is fixedly connected to the outer side of the bottom circular rod (202). One end of the outer connecting circular rod (203) far from the bottom circular rod (202) is fixedly connected to an annular connecting plate (204). A liquid passing round hole one (205) is opened at the top of the annular connecting plate (204). An annular sponge (206) is fixedly connected to the bottom of the annular connecting plate (204).

2. The tail gas treatment process according to claim 1, characterized in that: The top of the spraying device (2) is communicated with a high-pressure circulation pump (3). The top of the high-pressure circulation pump (3) is communicated with a concave connecting pipe (4). The bottom of the concave connecting pipe (4) is communicated with a drain pipe (5). The bottom of the circular empty shell (1) is communicated with an air inlet pipe (6). The part of the circular empty shell (1) near the top on the outside is communicated with an air outlet pipe (7). A driving motor (8) is fixedly connected to the center of the bottom of the circular empty shell (1). The driving shaft of the driving motor (8) penetrates through the circular empty shell (1) and is fixedly connected to a cleaning device (9). A bottom support column (10) is fixedly connected to the bottom of the circular empty shell (1). One end of the concave connecting pipe (4) far from the high-pressure circulation pump (3) is communicated with the bottom of the circular empty shell (1). The bottom of the cleaning device (9) is rotationally connected to the inner wall of the circular empty shell (1) through a rotating bolt.

3. The tail gas treatment process according to claim 1, characterized in that: The circular liquid passing shell (201) is set as a circular shell with a circular cavity inside and circular spraying holes opened at the bottom. The bottom of the circular liquid passing shell (201) is fixedly connected to the top of the circular empty shell (1). There are multiple liquid passing round holes one (205), and the multiple liquid passing round holes one (205) are distributed on the annular connecting plate (204).

4. The tail gas treatment process according to claim 1, characterized in that: The bottom of the bottom circular rod (202) is fixedly connected with a bottom circular plate (207). A second liquid-passing round hole (208) is formed in the top of the bottom circular plate (207). A circular sponge (209) is fixedly connected to the bottom of the bottom circular plate (207).

5. The tail gas treatment process according to claim 4, characterized in that: A plurality of the second liquid-passing round holes (208) are provided, and the plurality of the second liquid-passing round holes (208) are distributed on the bottom circular plate (207).

6. The tail gas treatment process according to claim 1, characterized in that: The cleaning device (9) includes a vertical scraping rod (901). A guiding and pushing mechanism (902) is fixedly connected to one side of the vertical scraping rod (901). A top scraping rod (903) is fixedly connected to a position near the top on one side of the vertical scraping rod (901). A first triangular scraping block (904) is fixedly connected to one side of the vertical scraping rod (901). A curved scraping rod (905) is fixedly connected to one side of the vertical scraping rod (901). A side-connected circular rod (906) is fixedly connected to one side of the vertical scraping rod (901). A concave scraping rod (907) is fixedly connected to the end of the side-connected circular rod (906) away from the vertical scraping rod (901). A second triangular scraping block (908) is fixedly connected to the top of the concave scraping rod (907).

7. The tail gas treatment process according to claim 6, characterized in that: The bottom of the guiding and pushing mechanism (902) is fixedly connected to the driving shaft of the driving motor (8). Two vertical scraping rods (901) are provided, and the two vertical scraping rods (901) are distributed on both sides of the guiding and pushing mechanism (902). Two first triangular scraping blocks (904) are provided, and the two first triangular scraping blocks (904) are distributed at positions on one side of the vertical scraping rod (901) below the top scraping rod (903). Two curved scraping rods (905) are provided, and the two curved scraping rods (905) are distributed at positions on one side of the vertical scraping rod (901) below the first triangular scraping block (904). Two side-connected circular rods (906) are provided, and the two side-connected circular rods (906) are distributed at positions on one side of the vertical scraping rod (901) below the curved scraping rod (905).

8. A tail gas treatment process according to claim 6, characterized in that: The guiding and pushing mechanism (902) includes a triangular scraping plate (9021). A first middle inclined plate (9022) is fixedly connected to the middle of one side of the triangular scraping plate (9021). A second middle inclined plate (9023) is fixedly connected to the middle of one side of the triangular scraping plate (9021). A triangular inclined plate (9024) is fixedly connected to one side of the second middle inclined plate (9023). A first inclined plate (9025) is fixedly connected to one side of the triangular scraping plate (9021). A second inclined plate (9026) is fixedly connected to the side of the triangular scraping plate (9021) close to the first inclined plate (9025).

9. The tail gas treatment process according to claim 8, characterized in that: The bottom of the triangular scraping plate (9021) is fixedly connected to the drive shaft of the drive motor (8). One side of the triangular scraping plate (9021) is fixedly connected to one side of the vertical scraping rod (901). There are two middle inclined plates I (9022), and the two middle inclined plates I (9022) are symmetrically distributed about the center on both sides of the triangular scraping plate (9021). There are two middle inclined plates II (9023), and the two middle inclined plates II (9023) are symmetrically distributed about the center on both sides of the triangular scraping plate (9021). One side of the middle inclined plate I (9022) is fixedly connected to one side of the triangular inclined plate (9024). There are multiple first inclined plates (9025), and the multiple first inclined plates (9025) are symmetrically distributed about the center on both sides of the triangular scraping plate (9021). There are multiple second inclined plates (9026), and the multiple second inclined plates (9026) are symmetrically distributed about the center on both sides of the triangular scraping plate (9021).

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