Tail gas treatment process and alkali solution spraying equipment thereof

Abstract

The present invention relates to the technical field of tail gas treatment, and specifically discloses a tail gas treatment process and alkali solution spraying equipment thereof. The tail gas treatment process and alkali solution spraying equipment thereof comprise a circular liquid-permeable shell, the bottom of the circular liquid-permeable shell being fixedly connected to a bottom circular rod, the outer side of the bottom circular rod being fixedly connected to an outer connecting circular rod, an end of the outer connecting circular rod away from the bottom circular rod being fixedly connected to an annular connecting plate, a first liquid-permeable circular hole being provided on the top of the annular connecting plate, an annular sponge being fixedly connected to the bottom of the annular connecting plate, a bottom of the bottom circular rod being fixedly connected to a bottom circular plate, a second liquid-permeable circular hole being provided on the top of the bottom circular plate, and a circular sponge being fixedly connected to the bottom of the bottom circular plate. The tail gas treatment process and alkali solution spraying equipment thereof, by providing an annular sponge and a circular sponge immersed in alkali solution, perform a suction-type full reaction on the tail gas, and prevent a large amount of tail gas from being filled into the circular shell, whereby a portion of the tail gas does not fully contact and react with the sprayed alkali solution and flows upward and is discharged from an exhaust pipe, affecting the treatment effect.

Description

Technical Field

[0001] The invention relates to the technical field of tail gas treatment, in particular to a tail gas treatment process and alkali solution spraying equipment thereof. 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 produces waste gas during production. Asphalt exhaust includes combustible gas, sulfide gas, cyanide gas, odorous gas and dust, etc. Asphalt exhaust can cause great harm to human health. Particulate matter, sulfur dioxide, nitrogen oxides, etc. in asphalt exhaust can irritate the respiratory tract and cause symptoms such as coughing, wheezing, and difficulty breathing. Therefore, asphalt exhaust must be treated. The treatment process of asphalt exhaust includes induced draft fan drainage, cooling, oil and gas separation, alkali solution, activated carbon, and photo-oxidation deodorization. The alkali solution refers to alkali solution spraying, which mainly utilizes acid-base neutralization reaction. The acid gas in the exhaust gas reacts chemically with the sprayed alkali solution to generate corresponding salt and water, thereby removing the acid gas from the exhaust gas.

[0003] When the alkali solution is sprayed, it will quickly fall down to the bottom of the inner wall of the spray tower. When there is a lot of tail gas entering from the bottom of the spray tower, some of the tail gas will pass by the rapidly falling alkali solution, resulting in a short reaction time and difficulty in fully reacting, affecting the treatment effect. Therefore, we proposed a tail gas treatment process and its alkali solution spraying equipment. Summary of the Invention

[0004] In order to solve the above technical problems, the present invention provides a tail gas treatment process and alkali solution spraying equipment thereof, comprising the following steps:

[0005] S1: The exhaust gas generated during the asphalt production process is collected and introduced into the cooling system through the negative pressure generated by the induced draft fan;

[0006] S2: Exhaust cooling, using heat exchanger or water spray cooling to reduce exhaust temperature;

[0007] S3: Oil and gas separation, using cyclone separators, wire mesh demisters or electrostatic oil removers to separate the oil mist and water vapor in the cooled exhaust gas;

[0008] S4: Alkali spraying: the tail gas after oil and gas separation enters the alkali spray equipment, where the alkali reacts with the acid gas to produce corresponding salt and water, thereby removing the acid gas from the tail gas;

[0009] S5: Activated carbon adsorption: the tail gas treated with alkali solution comes into contact with activated carbon to adsorb the residual organic pollutants in the tail gas, including various hydrocarbons and benzene series, so that the tail gas is deeply purified and the emission concentration of organic pollutants is reduced;

[0010] S6: Photo-oxidation deodorization uses photo-oxidation technology to deodorize the exhaust gas after activated carbon adsorption treatment, decompose odorous substances in the exhaust gas, and improve air quality.

[0011] The alkali solution spraying equipment includes a circular empty shell, the top of the circular empty shell is fixedly connected to a spray device, the top of the spray device is connected to a high-pressure circulation pump, the top of the high-pressure circulation pump is connected to a concave connecting pipe, the bottom of the concave connecting pipe is connected to a drain pipe, the bottom of the circular empty shell is connected to an air inlet pipe, the outer side of the circular empty shell near the top is connected to an air outlet pipe, the bottom center of the circular empty shell is fixedly connected to a drive motor, the drive shaft of the drive motor passes through the circular empty shell and is fixedly connected to a cleaning device, and the bottom of the circular empty shell is fixedly connected to a bottom support column;

[0012] The spray device includes a circular liquid-permeable shell, the bottom of the circular liquid-permeable shell is fixedly connected to a bottom round rod, the outer side of the bottom round rod is fixedly connected to an outer connecting round rod, the end of the outer connecting round rod away from the bottom round rod is fixedly connected to an annular connecting plate, the top of the annular connecting plate is provided with a liquid-permeable circular hole, and the bottom of the annular connecting plate is fixedly connected to an annular sponge;

[0013] One end of the concave connecting pipe away from the high-pressure circulation pump is connected to the bottom of the circular hollow shell, and the bottom of the cleaning device is rotatably connected to the inner wall of the circular hollow shell through a rotating bolt;

[0014] The circular liquid-passing shell is configured as a circular shell having a circular cavity inside and a circular spray hole at the bottom. The bottom of the circular liquid-passing shell is fixedly connected to the top of the circular hollow shell. A plurality of the liquid-passing circular holes are provided, and the plurality of the liquid-passing circular holes are distributed on the annular connecting plate.

[0015] The bottom of the bottom round rod is fixedly connected to a bottom circular plate, and the top of the bottom circular plate is provided with two liquid-passing circular holes. By respectively arranging a liquid-passing circular hole one and a liquid-passing circular hole two on the annular connecting plate and the bottom circular plate, which are aligned with the spray hole opened at the bottom of the circular liquid-passing shell, the sprayed alkali liquid is directly injected into the sponge under a certain pushing pressure, thereby preventing the sprayed alkali liquid from directly contacting the surface of the annular connecting plate and the bottom circular plate, which makes it difficult for the alkali liquid to effectively penetrate into the sponge when the sponge reaches an absorption saturation state. The bottom of the bottom circular plate is fixedly connected to a circular sponge, and the annular sponge and the circular sponge immersed in the alkali liquid are provided to fully react with the exhaust gas by suction, thereby preventing a part of the exhaust gas from not being absorbed by the sprayed exhaust gas when the circular shell is filled with a lot of exhaust gas. The alkali solution fully contacts and reacts and flows upward and is discharged from the exhaust pipe, affecting the treatment effect. The alkali solution is filled in the annular sponge and the circular sponge by spraying, so that the exhaust gas only contacts and reacts with the alkali solution on the surface of the sponge and is difficult to enter the interior, thereby preventing a large amount of exhaust gas from entering the sponge and reacting with the alkali solution, and the generated reactants are accumulated inside the sponge and difficult to be treated, 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, there is enough area for the exhaust gas to continue to flow upward after the neutralization reaction, thereby preventing the exhaust gas from having difficulty in effectively flowing upward 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, resulting in a part of the exhaust gas being squeezed and infiltrated into the sponge, affecting the subsequent neutralization effect.

[0016] There are multiple second liquid-passing circular holes, and the multiple second liquid-passing circular holes are distributed on the bottom circular plate.

[0017] The cleaning device further comprises a vertical scraper rod, and the vertical scraper rod is rotated with the guide pushing mechanism to scrape the inner wall of the circular empty shell to clean it, so as to prevent a lot of reaction residues from being attached to the inner wall of the circular empty shell after long-term use and affecting the subsequent exhaust gas treatment effect. The top of the concave scraper rod is fixedly connected with a triangular scraper block 2. When the triangular scraper block 1 and the triangular scraper block 2 rotate, they respectively scrape and clean the top surface of the annular connecting plate and the bottom circular plate to prevent a part of the residue flowing upward with the exhaust gas from continuously accumulating on the annular connecting plate and the bottom circular plate, blocking the liquid through hole 1 and the liquid through hole 2 and affecting the alkali solution from soaking into the sponge. The bottom of the guide pushing mechanism is fixedly connected to the driving shaft of the driving motor. The vertical scraper rod is provided with two, and the two vertical scraper rods are distributed on both sides of the guide pushing mechanism. The triangular scraper block 1 is provided with two, and the two triangular scraper blocks 1 are distributed on one side of the vertical scraper rod at the position below the top scraper rod, the curved scraper rod is provided with two, and the two curved scraper rods are distributed on one side of the vertical scraper rod at the position below the triangular scraper block 1, and the side connecting round rods are provided with two, and the two side connecting round rods are distributed on one side of the vertical scraper rod at the position below the curved scraper rod.

[0018] Furthermore, the guide pushing mechanism includes a triangular scraper, which scrapes the bottom of the inner wall of the circular empty shell when the triangular scraper rotates, and makes the scraped residues disengage from the bottom of the inner wall of the circular empty shell through its inclined surface, so as to prevent the residues from accumulating on the bottom of the inner wall of the circular empty shell for a long time, which increases the difficulty of cleaning and affects the cleaning effect. A central inclined plate 1 is fixedly connected to the middle of one side of the triangular scraper, a central inclined plate 2 is fixedly connected to the middle of one side of the triangular scraper, and a triangular inclined plate is fixedly connected to one side of the central inclined plate 2. When the triangular inclined plate rotates with the central inclined plate 1 and the central inclined plate 2, the central inclined plate The residue between the first and middle inclined plates two gradually moves upward along the inclined surface thereof and passes over the triangular inclined plate and falls on the triangular scraper, preventing a portion of the residue pushed by the middle inclined plate two to the middle inclined plate one and the middle inclined plate two from continuously accumulating and being difficult to be smoothly discharged from the drainage port to the concave connecting pipe. One side of the triangular scraper is fixedly connected to the first inclined plate, and the side of the triangular scraper close to the first inclined plate is fixedly connected to the second inclined plate. The residue at the bottom of the inner wall of the circular empty shell is pushed to the drainage port close to the concave connecting pipe for easy discharge by the middle inclined plate one, the middle inclined plate two, the first inclined plate and the second inclined plate, preventing the circular empty shell from being discharged. The position at the bottom of the inner wall where no drainage port is provided still has too much residue accumulated, which is difficult to be discharged and affects the subsequent exhaust gas treatment effect. When the residue is pushed to rotate by the inclined surface arrangement of the middle inclined plate 1, the middle inclined plate 2, the first inclined plate and the second inclined plate, it moves back and forth between the center square near the bottom of the inner wall of the circular empty shell and the outer direction to facilitate the movement of the residue to the position of the drainage port for discharge, and prevents a part of the residue near the center direction and the outer direction of the circular empty shell from being far away from the drainage port, and it is always difficult to be pushed to the position of the drainage port for smooth discharge. The bottom of the triangular scraper is fixedly connected to the driving shaft of the driving motor. One side of the triangular scraper is fixedly connected to one side of the vertical scraper rod, two central inclined plates are provided, and the two central inclined plates are symmetrically distributed on both sides of the triangular scraper, two central inclined plates are provided, and the two central inclined plates are symmetrically distributed on both sides of the triangular scraper, one side of the central inclined plate is fixedly connected to one side of the triangular inclined plate, multiple first inclined plates are provided, and multiple first inclined plates are symmetrically distributed on both sides of the triangular scraper, multiple second inclined plates are provided, and multiple second inclined plates are symmetrically distributed on both sides of the triangular scraper.

[0019] The present invention provides a tail gas treatment process and alkali solution spraying equipment thereof, which has the following beneficial effects:

[0020] 1. The exhaust gas treatment process and alkali solution spraying equipment thereof are provided with an annular sponge and a circular sponge immersed in alkali solution to perform a suction-type full reaction on the exhaust gas, so as to prevent that when a large amount of exhaust gas is filled into the circular empty shell, a part of the exhaust gas does not fully contact and react with the sprayed alkali solution and flows upward and is discharged from the exhaust pipe, affecting the treatment effect; the vertical scraper rod rotated with the guide pushing mechanism performs a scraping-type cleaning on the inner wall of the circular empty shell, so as to prevent a large amount of reaction residues from being attached to the inner wall of the circular empty shell after long-term use and being difficult to remove, affecting the subsequent exhaust gas treatment effect; the residues at the bottom of the inner wall of the circular empty shell are pushed to the drain port near the concave connecting pipe for easy discharge by the middle inclined plate 1, the middle inclined plate 2, the first inclined plate and the second inclined plate, so as to prevent excessive residues from being accumulated at the position at the bottom of the inner wall of the circular empty shell where no drain port is opened and being difficult to discharge, affecting the subsequent exhaust gas treatment effect.

[0021] 2. The tail gas treatment process and alkali solution spraying equipment thereof are provided with a spraying device, which is provided with an annular sponge and a circular sponge immersed in alkali solution to fully react the tail gas by suction, so as to prevent that when the tail gas filled in the circular empty shell is large, a part of the tail gas does not fully contact and react with the sprayed alkali solution and flows upward and is discharged from the exhaust pipe, thereby affecting the treatment effect. By respectively providing a liquid-through hole 1 and a liquid-through hole 2 on the annular connecting plate and the bottom circular plate, which are aligned with the spray hole opened at the bottom of the circular liquid-through shell, the sprayed alkali solution is directly injected into the sponge under a certain pushing pressure, so as to prevent the sprayed alkali solution from directly contacting the surface of the annular connecting plate and the bottom circular plate, resulting in the sponge reaching the absorption saturation state. The liquid can no longer effectively penetrate into the sponge, and the alkali solution is filled into the annular sponge and the circular sponge by spraying, so that the exhaust gas only contacts the alkali solution on the surface of the sponge and reacts, and it is difficult to enter the interior, thereby preventing a large amount of exhaust gas from entering the sponge and reacting with the alkali solution. The reactants produced are accumulated in the sponge and are difficult to handle, affecting the use effect of the sponge. By separately arranging the annular sponge and the circular sponge at the bottom of the circular liquid-permeable shell, there is enough area for the exhaust gas to continue to flow upward after the neutralization reaction, thereby preventing the exhaust gas from having difficulty in effectively flowing upward when a circular sponge with the same outer diameter as the annular connecting plate is directly arranged at the bottom of the circular liquid-permeable shell, resulting in a part of the exhaust gas being squeezed and infiltrated into the sponge, affecting the subsequent neutralization effect.

[0022] 3. The exhaust gas treatment process and its alkali solution spraying equipment are provided with a cleaning device. The vertical scraper rod rotates with the guide pushing mechanism to scrape and clean the inner wall of the circular empty shell, so as to prevent a large amount of reaction residues from being attached to the inner wall of the circular empty shell after long-term use and being difficult to remove, which affects the subsequent exhaust gas treatment effect. The top scraper rod scrapes and cleans the bottom surface of the circular liquid-passing shell as the vertical scraper rod rotates, so as to prevent the reaction residues from accumulating at the bottom of the circular liquid-passing shell after long-term use and clogging the spray holes and affecting the spray effect. When the triangular scraper block 1 and the triangular scraper block 2 rotate, they respectively scrape and clean the top surfaces of the annular connecting plate and the bottom circular plate, so as to prevent a part of the residues flowing upward with the exhaust gas from continuously accumulating on the annular connecting plate and the bottom circular plate, clogging the liquid-passing circular hole 1 and the liquid-passing circular hole 2 and affecting the alkali solution from soaking into the sponge. When the curved scraper rod and the concave scraper rod rotate, they respectively scrape and clean the outer surfaces of the annular sponge and the circular sponge, so as to prevent the annular sponge and the circular sponge from gradually accumulating too much residue on the surface after long-term use, covering the sponge surface and affecting the contact effect between the exhaust gas and the sponge.

[0023] 4. The tail gas treatment process and alkali solution spraying equipment thereof are provided with a guide pushing mechanism. When the triangular scraper rotates, it scrapes the bottom of the inner wall of the circular empty shell, and the scraped residue is separated from the bottom of the inner wall of the circular empty shell by its inclined surface, so as to prevent the residue from accumulating on the bottom of the inner wall of the circular empty shell for a long time, which increases the difficulty of cleaning and affects the cleaning effect. The residue at the bottom of the inner wall of the circular empty shell is pushed to the drainage port near the concave connecting pipe for easy discharge by the middle inclined plate 1, the middle inclined plate 2, the first inclined plate and the second inclined plate, so as to prevent the accumulation of excessive residue at the position where the drainage port is not provided on the bottom of the inner wall of the circular empty shell and makes it difficult to discharge and affects the subsequent tail gas treatment effect. The inclined surface of the inclined plate pushes the residue to rotate, and moves back and forth between the center square near the bottom of the inner wall of the circular empty shell and the outer direction, so that the residue can be moved to the position of the drain port for discharge, thereby preventing a part of the residue near the center and outer direction of the circular empty shell from being far away from the drain port, and always being difficult to be pushed to the position of the drain port for smooth discharge. When the triangular inclined plate rotates with the middle inclined plate 1 and the middle inclined plate 2, the residue between the middle inclined plate 1 and the middle inclined plate 2 is pushed to gradually move upward along its inclined surface and cross the triangular inclined plate and fall on the triangular scraper, thereby preventing a part of the residue pushed by the middle inclined plate 2 to the space between the middle inclined plate 1 and the middle inclined plate 2 from continuing to accumulate, and being difficult to be discharged smoothly from the drain port to the concave connecting pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 Schematic diagram of the tail gas treatment process of the present invention;

[0025] Figure 2 This is a schematic structural diagram of the alkali solution spraying equipment of the present invention;

[0026] Figure 3This is a schematic diagram of the bottom side cross-sectional structure of the alkali solution spraying equipment of the present invention;

[0027] Figure 4 It is a schematic diagram of a partial side cross-section structure of the spray device of the present invention;

[0028] Figure 5 This is a schematic diagram of the bottom structure of the spray device of the present invention;

[0029] Figure 6 It is a schematic diagram of the partial structure of the cleaning device of the present invention;

[0030] Figure 7 This is a schematic diagram of the overall structure of the cleaning device of the present invention;

[0031] Figure 8 This is a structural diagram of the guide pushing mechanism of the present invention;

[0032] Figure 9 This is a schematic diagram of the bottom structure of the guide pushing mechanism of the present invention.

[0033] Figure: 1, circular shell; 2, spray device; 3, high-pressure circulation pump; 4, concave connecting pipe; 5, drain pipe; 6, air inlet pipe; 7, air outlet pipe; 8, drive motor; 9, cleaning device; 10, bottom support column; 201, circular liquid shell; 202, bottom round rod; 203, external round rod; 204, annular connecting plate; 205, liquid hole 1; 206, annular sponge; 207, bottom round plate; 208, liquid hole 2; 2 09, round sponge; 901, vertical scraper; 902, guide pushing mechanism; 903, top scraper; 904, triangular scraper block 1; 905, curved scraper; 906, side-connected round rod; 907, concave scraper; 908, triangular scraper block 2; 9021, triangular scraper; 9022, center inclined plate 1; 9023, center inclined plate 2; 9024, triangular inclined plate; 9025, first inclined plate; 9026, second inclined plate. DETAILED DESCRIPTION

[0034] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0035] See also Figure 1-Figure 5 The present invention provides a tail gas treatment process and alkali solution spraying equipment thereof, comprising the following steps:

[0036] S1: The exhaust gas generated during the asphalt production process is collected and introduced into the cooling system through the negative pressure generated by the induced draft fan;

[0037] S2: Exhaust cooling, using heat exchanger or water spray cooling to reduce exhaust temperature;

[0038] S3: Oil and gas separation, using cyclone separators, wire mesh demisters or electrostatic oil removers to separate the oil mist and water vapor in the cooled exhaust gas;

[0039] S4: Alkali spraying: the tail gas after oil and gas separation enters the alkali spray equipment, where the alkali reacts with the acid gas to produce corresponding salt and water, thereby removing the acid gas from the tail gas;

[0040] S5: Activated carbon adsorption: The tail gas treated with alkali solution comes into contact with activated carbon to adsorb the residual organic pollutants in the tail gas, including various hydrocarbons and benzene series, so that the tail gas is deeply purified and the emission concentration of organic pollutants is reduced;

[0041] S6: Photo-oxidation deodorization uses photo-oxidation technology to deodorize the exhaust gas after activated carbon adsorption treatment, decompose odorous substances in the exhaust gas, and improve air quality.

[0042] The alkali solution spraying equipment includes a circular empty shell 1, a spraying device 2 is fixedly connected to the top of the circular empty shell 1, a high-pressure circulation pump 3 is connected to the top of the spraying device 2, a concave connecting pipe 4 is connected to the top of the high-pressure circulation pump 3, a drain pipe 5 is connected to the bottom of the concave connecting pipe 4, an air inlet pipe 6 is connected to the bottom of the circular empty shell 1, an air outlet pipe 7 is connected to the outer side of the circular empty shell 1 near the top, a drive motor 8 is fixedly connected to the center of the bottom of the circular empty shell 1, a drive shaft of the drive motor 8 passes through the circular empty shell 1 and is fixedly connected to a cleaning device 9, and a bottom support column 10 is fixedly connected to the bottom of the circular empty shell 1;

[0043] The spray device 2 includes a circular liquid-permeable shell 201, the bottom of which is fixedly connected to a bottom circular rod 202, the outer side of which is fixedly connected to an outer connecting circular rod 203, and an annular connecting plate 204 is fixedly connected to the end of the outer connecting circular rod 203 away from the bottom circular rod 202. The top of the annular connecting plate 204 is provided with a liquid-permeable circular hole 205, and the bottom of the annular connecting plate 204 is fixedly connected to an annular sponge 206;

[0044] One end of the concave connecting pipe 4 away from the high-pressure circulating pump 3 is connected to the bottom of the circular hollow shell 1, and the bottom of the cleaning device 9 is rotatably connected to the inner wall of the circular hollow shell 1 through a rotating bolt;

[0045] The circular liquid-passing shell 201 is configured as a circular shell having a circular cavity inside and a circular spray hole at the bottom. The bottom of the circular liquid-passing shell 201 is fixedly connected to the top of the circular hollow shell 1. A plurality of liquid-passing circular holes 205 are provided, and the plurality of liquid-passing circular holes 205 are distributed on the annular connecting plate 204.

[0046] The bottom of the bottom round rod 202 is fixedly connected to a bottom circular plate 207, the top of the bottom circular plate 207 is provided with a second liquid hole 208, and the bottom of the bottom circular plate 207 is fixedly connected to a circular sponge 209;

[0047] There are multiple liquid-passing circular holes 208, and the multiple liquid-passing circular holes 208 are distributed on the bottom circular plate 207. When in use, 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 exhaust gas is filled into the circular empty shell 1 from the air inlet pipe 6. The exhaust gas entering the circular empty shell 1 flows upward and contacts the spray device 2 to react with the alkali solution. The exhaust gas after reacting with the alkali solution continues to flow upward and is discharged outward through the outlet pipe 7. At the same time, the high-pressure circulation pump 3 can re-draw the alkali solution falling from the bottom of the inner wall of the circular empty shell 1 into the spray device 2 through the concave connecting pipe 4 for re-treatment. Reuse, after the alkali solution is reused many times, the salt and water produced by the multiple reactions of the alkali solution in the circular empty shell 1 can be discharged through the drain pipe 5, and at the same time, the cleaning device 9 is driven by the driving motor 8 to rotate to clean the inner wall of the circular empty shell 1 and the surface of the spray device 2 to clean the residue and discharge it outward through the drain pipe 5. After the reaction product is completely discharged, it can be connected to the alkali solution tank through the drain pipe 5 and the alkali solution is pumped into the spray 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 turn, and finally flows upward through the inner side of the annular connecting plate 204 The alkali solution in the concave connecting pipe 4 is pumped into the circular liquid shell 201 and evenly sprayed to the bottom through the circular liquid shell 201. The alkali solution sprayed from the bottom of the circular liquid 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 through the liquid hole 1 205 and the liquid hole 2 208 respectively. The tail gas flowing upward and contacting the annular sponge 206 and the circular sponge 209 will enter the sponge interior and react with the alkali solution. By arranging the annular sponge 206 and the circular sponge 209 immersed in the alkali solution, the tail gas in the concave connecting pipe 4 is evenly sprayed to the bottom through the circular liquid shell 201. To fully react the tail gas by suction, a liquid hole 1 205 and a liquid hole 208 are respectively provided on the annular connecting plate 204 and the bottom circular plate 207, which are aligned with the spray hole opened at the bottom of the circular liquid shell 201, so that the sprayed alkali liquid is directly injected into the sponge under a certain pushing pressure, and the alkali liquid is filled with the inside of the annular sponge 206 and the circular sponge 209 by spraying, so that the tail gas only contacts and reacts with the alkali liquid on the surface of the sponge and is difficult to enter the interior. By separately arranging the annular sponge 206 and the circular sponge 209 at the bottom of the circular liquid shell 201, there is enough area for the tail gas to continue to flow upward after the neutralization reaction.

[0048] See also Figures 1-9The present invention provides an exhaust gas treatment process and an alkali solution spraying device thereof: the cleaning device 9 includes a vertical scraper rod 901, one side of the vertical scraper rod 901 is fixedly connected to a guide pushing mechanism 902, one side of the vertical scraper rod 901 near the top is fixedly connected to an overhead scraper rod 903, one side of the vertical scraper rod 901 is fixedly connected to a triangular scraper block 1 904, one side of the vertical scraper rod 901 is fixedly connected to a curved scraper rod 905, one side of the vertical scraper rod 901 is fixedly connected to a side connecting round rod 906, one end of the side connecting round rod 906 away from the vertical scraper rod 901 is fixedly connected to a concave scraper rod 907, and the top of the concave scraper rod 907 is fixedly connected to a triangular scraper block 2 908. The bottom of the guide pushing mechanism 902 is fixedly connected to the driving shaft of the driving motor 8, and two vertical scraping rods 901 are provided, and the two vertical scraping rods 901 are distributed on both sides of the guide pushing mechanism 902, two triangular scraping blocks 904 are provided, and the two triangular scraping blocks 904 are distributed on one side of the vertical scraping rod 901 and below the top scraping rod 903, two curved scraping rods 905 are provided, and the two curved scraping rods 905 are distributed on one side of the vertical scraping rod 901 and below the triangular scraping block 904, and two side connecting round rods 906 are provided, and the two side connecting round rods 906 are distributed on one side of the vertical scraping rod 901 and below the curved scraping rod 905;

[0049] The guide pushing mechanism 902 includes a triangular scraper 9021, a central inclined plate 1 9022 is fixedly connected to the middle of one side of the triangular scraper 9021, a central inclined plate 2 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 2 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 1 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 rod 901 rotates, it always contacts the inner wall of the circular empty shell 1. As the guide pushing mechanism 902 rotates, the vertical scraper rod 901 scrapes and cleans the inner wall of the circular empty shell 1. When the guide pushing mechanism 902 rotates, the vertical scraper rod 901 drives the top scraper rod 903, the triangular scraper block 1 904, the curved scraper rod 905, the side connecting round rod 906, the concave scraper rod 907 and the triangular scraper block 2 908 to rotate together. When the top scraper rod 903 rotates with the vertical scraper rod 901 The bottom surface of the circular liquid-passing shell 201 is scraped and cleaned. When the triangular scraper 1 904 and the triangular scraper 2 908 rotate, they scrape and clean the top surface of the annular connecting plate 204 and the bottom circular plate 207 respectively. When the curved scraper rod 905 and the concave scraper rod 907 rotate, they scrape and clean the outer surface of the annular sponge 206 and the circular sponge 209 respectively. When the residue needs to be discharged outward through the drain pipe 5, the drive motor 8 is started to drive the top triangular scraper 9021 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.At the same time, the triangular scraper rod will also drive the central inclined plate 1 9022, the central inclined plate 2 9023, the triangular inclined plate 9024, the first inclined plate 9025 and the second inclined plate 9026 on the two sides adjacent to the vertical scraper rod 901 to rotate together. As the triangular scraper 9021 rotates clockwise, the central inclined plate 2 9023 and the first inclined plate 9025 push the residue to move along their inclined surfaces in the direction close to the center of the triangular scraper 9021. The residue moved to the triangular scraper 9021 through the first inclined plate 9025 passes over the triangular scraper 9021 and contacts the central inclined plate 1 9022 and the second inclined plate 9026 on the opposite side and moves through their inclined surfaces in the direction close to the outside of the circular empty shell 1. The residue at the bottom of the inner wall of the circular empty shell 1 is pushed to the discharge port near the concave connecting pipe 4 by the central inclined plate 1 9022, the central inclined plate 2 9023, the first inclined plate 9025 and the second inclined plate 9026. To facilitate discharge, the inclined surfaces of the first and second central inclined plates 9022, 9023, 9025, and 9026 push the residue to move back and forth between the center square near the bottom of the inner wall of the circular hollow shell 1 and the outer direction, so that the residue can be moved to the position of the drain port for discharge. As the triangular scraper 9021 rotates, the second central inclined plate 9023 guides the pushed residue to between the first and second central inclined plates 9022, 9023. As the second and first central inclined plates 9023 rotate, they drive the triangular inclined plate 9024 between them to rotate together. As the first and second central inclined plates 9022, 9023 rotate, the triangular inclined plate 9024 pushes the residue between the first and second central inclined plates 9022, 9023, to gradually move upward along its inclined surface, pass over the triangular inclined plate 9024, and fall onto the triangular scraper 9021.

[0050] 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 exhaust gas is filled into the circular empty shell 1 from the air inlet pipe 6. The exhaust gas entering the circular empty shell 1 flows upward and contacts the spraying device 2 to react with the alkali solution. The exhaust gas after reacting with the alkali solution continues to flow upward and is discharged outward through the outlet pipe 7. At the same time, the high-pressure circulation pump 3 can re-pump the alkali solution that falls from the bottom of the inner wall of the circular empty shell 1 into the spraying device 2 for reuse through the concave connecting pipe 4. After the alkali solution is reused many times, the salt and water produced after the alkali solution in the circular empty shell 1 reacts many times can be discharged through the drain pipe 5. At the same time, the driving motor 8 drives the cleaning device 9 to rotate to clean the circular empty shell. 1 and the surface of the spray device 2 are cleaned of residues and discharged outwardly through the drain pipe 5. After the reaction product is completely discharged, the drain pipe 5 can be connected to the alkali liquid tank to pump the alkali liquid into the spray 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 turn. Finally, it flows upward through 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 liquid in the concave connecting pipe 4 into the circular liquid shell 201 and sprays it evenly to the bottom through the circular liquid shell 201. The alkali liquid sprayed from the bottom of the circular liquid shell 201 falls on the annular connecting plate 204 and the bottom circular plate 207, and passes through the liquid hole 204. 05 and the liquid-passing circular hole 208 penetrate into the annular sponge 206 and the circular sponge 209 respectively, and the tail gas flowing upward and contacting the annular sponge 206 and the circular sponge 209 will enter the interior of the sponge and react with the alkali solution. By arranging the annular sponge 206 and the circular sponge 209 immersed in the alkali solution, the tail gas is fully reacted by suction. By arranging the liquid-passing circular hole 1 205 and the liquid-passing circular hole 208 aligned with the spray hole opened at the bottom of the circular liquid-passing shell 201 on the annular connecting plate 204 and the bottom circular plate 207 respectively, the sprayed alkali solution is directly injected into the sponge under a certain pushing pressure, and the alkali solution is filled in the annular sponge 206 and the circular sponge 209 by spraying, so that the tail gas only reacts with the alkali solution on the surface of the sponge. It is difficult for the contact reaction to enter the interior. 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 exhaust gas to continue to flow upward after the neutralization reaction. 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 top guide pusher mechanism 902 to rotate. The guide pusher 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 drain port. When the guide pusher mechanism 902 rotates, it drives the vertical scrapers 901 on both sides to rotate. When the vertical scraper 901 rotates, it is in contact with the inner wall of the circular empty shell 1 at all times. As the guide pusher mechanism 902 rotates, the vertical scraper 901 scrapes and cleans the inner wall of the circular empty shell 1.When the vertical scraper 901 rotates along with the guide pushing mechanism 902, it drives the top scraper 903, triangular scraper block 1 904, curved scraper 905, side connecting round rod 906, concave scraper 907 and triangular scraper block 2 908 on one side to rotate together. When the top scraper 903 rotates along with the vertical scraper 901, it scrapes and cleans the bottom surface of the circular liquid shell 201. When the triangular scraper block 1 904 and the triangular scraper block 2 908 rotate, they respectively scrape and clean the top surface of the annular connecting plate 204 and the bottom circular plate 207. When the curved scraper 905 and the concave scraper 907 rotate, they respectively scrape and clean the outer surface of the annular sponge 206 and the circular sponge 209. The residue needs to be discharged outward through the drain pipe 5. When discharging, 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 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 scraper rods will also drive the middle inclined plate 1 9022, the middle inclined plate 2 9023, the triangular inclined plate 9024, the first inclined plate 9025 and the second inclined plate 9026 on the two sides adjacent to the vertical scraper rod 901 to rotate together. When the middle inclined plate 2 9023 and the first inclined plate 9025 rotate clockwise with the triangular scraper 9021, they push the residues along their inclined surfaces to the sides. The residue on the triangular scraper 9021 moves toward the center of the triangular scraper 9021 through the first inclined plate 9025, passes over the triangular scraper 9021, contacts the middle inclined plate 1 9022 and the second inclined plate 9026 on the opposite side, and moves toward the outer side of the circular shell 1 through its inclined surface. The residue at the bottom of the inner wall of the circular shell 1 is pushed to the drain port near the concave connecting pipe 4 for easy discharge by the middle inclined plate 1 9022, the middle inclined plate 2 9023, the first inclined plate 9025 and the second inclined plate 9026. When the residue is pushed to rotate near the concave connecting pipe 4, the inclined surface setting of the middle inclined plate 1 9022, the middle inclined plate 2 9023, the first inclined plate 9025 and the second inclined plate 9026 is set. The circular hollow shell 1 moves back and forth between the center square at the bottom and the outer side of the inner wall, facilitating the movement of residue to the drain port for discharge. As the triangular scraper 9021 rotates, the second central inclined plate 9023 guides the residue pushed between the first and second central inclined plates 9022. The rotation of the second and first central inclined plates 9023 drives the triangular inclined plate 9024 between them to rotate together. As the first and second central inclined plates 9022 and 9023 rotate, the triangular inclined plate 9024 pushes the residue between them gradually upward along its slope, passing over the triangular inclined plate 9024 and landing on the triangular scraper 9021.

[0051] Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field and related fields without making creative efforts should fall within the scope of protection of the present invention. Structures, devices, and operating methods not specifically described and explained in the present invention shall be implemented in accordance with conventional means in the field unless otherwise specified or limited.

Claims

1. A tail gas treatment process, characterized in that: The following steps are involved: S1: The exhaust gas generated during the asphalt production process is collected and introduced into the cooling system through the negative pressure generated by the induced draft fan; S2: Exhaust cooling, using heat exchanger or water spray cooling to reduce exhaust temperature; S3: Oil and gas separation, using cyclone separators, wire mesh demisters or electrostatic oil removers to separate the oil mist and water vapor in the cooled exhaust gas; S4: Alkali spraying: the tail gas after oil and gas separation enters the alkali spray equipment, where the alkali reacts with the acid gas to produce corresponding salt and water, thereby removing the acid gas from the tail gas; S5: Activated carbon adsorption: the tail gas treated with alkali solution comes into contact with 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: Photooxidation deodorization uses photooxidation technology to deodorize the exhaust gas after activated carbon adsorption treatment, decompose odorous substances in the exhaust gas, and improve air quality; The alkali solution spraying equipment comprises a circular hollow shell (1), the top of which is fixedly connected to a spraying device (2). The spray device (2) comprises a circular liquid-passing shell (201), the bottom of the circular liquid-passing shell (201) is fixedly connected to a bottom circular rod (202), the outer side of the bottom circular rod (202) is fixedly connected to 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 to an annular connecting plate (204), a liquid-passing circular hole (205) is provided on the top of the annular connecting plate (204), and an annular sponge (206) is fixedly connected to the bottom of the annular connecting plate (204); A driving motor (8) is fixedly connected to the bottom center of the circular hollow shell (1), and a driving shaft of the driving motor (8) passes through the circular hollow shell (1) and is fixedly connected to a cleaning device (9); The cleaning device (9) comprises a vertical scraper (901), one side of the vertical scraper (901) is fixedly connected to a guide pushing mechanism (902), one side of the vertical scraper (901) is fixedly connected to a top scraper (903), one side of the vertical scraper (901) is fixedly connected to a triangular scraper block (904), and one side of the vertical scraper (901) is fixedly connected to a curved scraper (905).

2. A tail gas treatment process according to claim 1, characterized in that: The top of the spray device (2) is connected to a high-pressure circulation pump (3), the top of the high-pressure circulation pump (3) is connected to a concave connecting pipe (4), the bottom of the concave connecting pipe (4) is connected to a drain pipe (5), the bottom of the circular empty shell (1) is connected to an air inlet pipe (6), the outer portion of the circular empty shell (1) near the top is connected to an air outlet pipe (7), the bottom of the circular empty shell (1) is fixedly connected to a bottom support column (10), the end of the concave connecting pipe (4) away from the high-pressure circulation pump (3) is connected to the bottom of the circular empty shell (1), and the bottom of the cleaning device (9) is rotatably 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 configured as a circular shell having a circular cavity inside and a circular spray hole at the bottom. The bottom of the circular liquid-passing shell (201) is fixedly connected to the top of the circular hollow shell (1). A plurality of the liquid-passing circular holes (205) are provided, and the plurality of the liquid-passing circular holes (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 to a bottom circular plate (207), the top of the bottom circular plate (207) is provided with a second liquid-passing circular hole (208), and the bottom of the bottom circular plate (207) is fixedly connected to a circular sponge (209).

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

6. The tail gas treatment process according to claim 1, characterized in that: One side of the vertical scraper rod (901) is fixedly connected to a side connecting round rod (906), one end of the side connecting round rod (906) away from the vertical scraper rod (901) is fixedly connected to a concave scraper rod (907), and the top of the concave scraper rod (907) is fixedly connected to a second triangular scraper block (908).

7. The tail gas treatment process according to claim 6, characterized in that: The bottom of the guide pushing mechanism (902) is fixedly connected to the drive shaft of the drive motor (8), two vertical scraper rods (901) are provided, and the two vertical scraper rods (901) are distributed on both sides of the guide pushing mechanism (902), two triangular scraper blocks (904) are provided, and the two triangular scraper blocks (904) are distributed on one side of the vertical scraper rod (901) and below the top scraper rod (903), two curved scraper rods (905) are provided, and the two curved scraper rods (905) are distributed on one side of the vertical scraper rod (901) and below the triangular scraper block (904), and two side connecting round rods (906) are provided, and the two side connecting round rods (906) are distributed on one side of the vertical scraper rod (901) and below the curved scraper rod (905).

8. The tail gas treatment process according to claim 1, characterized in that: The guide pushing mechanism (902) comprises a triangular scraper (9021), a first central inclined plate (9022) being fixedly connected to the middle of one side of the triangular scraper (9021), a second central inclined plate (9023) being fixedly connected to the middle of one side of the triangular scraper (9021), a triangular inclined plate (9024) being fixedly connected to one side of the second central inclined plate (9023), a first inclined plate (9025) being fixedly connected to one side of the triangular scraper (9021), and a second inclined plate (9026) being fixedly connected to the side of the triangular scraper (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 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 central inclined plates (9022) are centrally symmetrically distributed on both sides of the triangular scraper (9021), and two central inclined plates (9023) are provided, and the two central inclined plates (9023) are centrally symmetrical. The first inclined plates (9025) are arranged in a centrally symmetrical manner on both sides of the triangular scraper (9021); one side of the centrally oriented 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).

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