Multi-stage spraying-adsorption deep purification equipment for tail gas generated in naphthalene sulfonic acid production

Abstract

The invention discloses multistage spraying-adsorption deep purification equipment for naphthalene sulfonic acid production tail gas, and belongs to the technical field of industrial waste gas treatment. The multistage spraying-adsorption deep purification equipment for the naphthalene sulfonic acid production tail gas comprises a spraying tower, a cyclone separator and an adsorption box which are sequentially connected, the spraying tower is sequentially provided with a conical liquid collecting tank, a dispersion plate, a filler layer and an alkali liquor spraying pipe from bottom to top, and one side of the spraying tower is provided with a tail gas inlet pipe inserted into the lower portion of the dispersion plate. According to the multi-stage spraying-adsorption deep purification equipment for the naphthalene sulfonic acid production tail gas, the multi-stage spraying, cyclone separation and adsorption technologies are combined, SO2, acid gas and organic pollutants in the naphthalene sulfonic acid production tail gas are efficiently removed, the emission of harmful substances is reduced by adopting an efficient waste gas treatment method, and the environmental pollution is reduced. Meanwhile, waste water is recycled through the waste liquid collecting pool, and the activated carbon layer subjected to silanization treatment has good hydrophobicity.

Description

Technical Field

[0001] The invention relates to the technical field of industrial waste gas treatment, in particular to a multi-stage spray-adsorption deep purification device for tail gas produced by naphthalenesulfonic acid. Background Art

[0002] The exhaust gas produced during naphthalenesulfonic acid production has a complex composition, typically containing pollutants such as SO₂, SO₃, naphthalene vapor, sulfonic acid droplets, and fine dust. Traditional treatment methods (such as single-stage alkali spray or activated carbon adsorption) suffer from low purification efficiency, clogging, and secondary contamination. Existing technologies lack the synergistic optimization of multi-stage spray and adsorption processes, making it difficult to achieve deep exhaust purification and resource recovery. Summary of the Invention

[0003] The present invention aims to provide a multi-stage spray-adsorption deep purification device for tail gas from the production of naphthalenesulfonic acid. By combining multi-stage spraying, cyclone separation and adsorption technologies, the device can achieve efficient removal of SO2, acid gases and organic pollutants in the tail gas from the production of naphthalenesulfonic acid. The device adopts an efficient waste gas treatment method to reduce the emission of harmful substances, thereby solving the problems raised in the above-mentioned background technology.

[0004] To achieve the above-mentioned object, the present invention provides the following technical solution: a multi-stage spray-adsorption deep purification device for tail gas from naphthalenesulfonic acid production, comprising a spray tower, a cyclone separator and an adsorption box connected in sequence, wherein the spray tower is provided with a conical liquid collecting trough, a dispersion plate, a packing layer and an alkaline solution spray pipe in sequence from bottom to top, a tail gas inlet pipe inserted under the dispersion plate is provided on one side of the spray tower, and a water spray assembly is provided on the upper surface of the dispersion plate; the air inlet of the cyclone separator is connected to the top of the spray tower, and the air outlet of the cyclone separator is connected to the adsorption box, and a high-efficiency activated carbon layer is provided in the adsorption box.

[0005] Preferably, the water spray assembly includes a column, a water inlet pipe and a first fan. The lower end of the column is fixedly connected to the upper surface of the dispersion plate. A water inlet groove is opened in the column, and the water inlet pipe passes through the water inlet groove. A rotating shaft is provided at the lower end of the first fan, and the rotating shaft passes through the water inlet groove. A turbine is provided at the position where the rotating shaft is placed on the water inlet groove. The rotating shaft is perpendicular to the direction of the water inlet pipe. After the water in the water inlet pipe enters the water inlet groove, it drives the turbine in the water inlet groove to rotate, and controls the rotation of the first fan connected to the turbine. The rotation of the first fan drives the airflow in the spray tower upward, accelerates the upward movement of the exhaust gas, and further disperses the exhaust gas.

[0006] Preferably, a rotating groove is provided at the upper end of the column, the end of the water inlet pipe is connected to the rotating groove, the water in the water inlet pipe eventually flows into the rotating groove, the rotating shaft passes through the rotating groove, and a sealing ring is provided at a position where the rotating shaft is located outside the rotating groove, and a water inlet hole is opened at a position where the rotating shaft is located inside the rotating groove, and the water inlet hole is connected to the interior of the first fan.

[0007] Preferably, a water spray port is provided on the blade of the first fan, and the water spray port is connected to the water inlet hole. The first fan rotates in the rotating groove through the rotating shaft, and the water spray port rotates and sprays water to cool the rising exhaust gas.

[0008] Preferably, a corrugated plate is provided in the filler.

[0009] Preferably, a drive motor is provided at the upper end of the cyclone separator, the output end of the drive motor is connected to a second fan, the second fan is connected to the gas output end of the cyclone separator, a partition is provided below the second fan in the cyclone separator, and an air collecting port is provided on the lower surface of the partition.

[0010] Preferably, spiral blades are provided on the partition plate of the outer ring of the air collecting port, and the cyclone separator is connected to a waste liquid collection tank, and the collected droplets and particulate matter are collected and recycled by the waste liquid collection tank.

[0011] Preferably, the high-efficiency activated carbon layer is provided with no less than three layers, and the high-efficiency activated carbon layer is loaded with metal oxides.

[0012] Preferably, the processing method of the high-efficiency activated carbon layer is as follows: soaking the activated carbon in dilute nitric acid, washing with water and drying; ultrasonically impregnating it with a mixture of Fe(NO3)3·9H2O and Cu(NO3)2·3H2O, calcining it under N2 protection, and finally forming it by silanization treatment.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] The present invention proposes a multi-stage spray-adsorption deep purification device for naphthalenesulfonic acid production tail gas, which combines multi-stage spraying, cyclone separation and adsorption technology to achieve efficient removal of SO2, acidic gas and organic pollutants in the naphthalenesulfonic acid production tail gas, reduces the emission of harmful substances by adopting an efficient waste gas treatment method, and recycles waste water through a waste liquid collection pool. The activated carbon layer treated with silanization has good hydrophobicity, reduces the adhesion of sulfonic acid droplets, and thus extends the service life of the adsorption material. The water spray component drives the turbine to rotate through the water flow of the water inlet pipe, drives the first fan to rotate, and forcibly guides the tail gas to move upward, thereby improving the flow efficiency of the gas in the spray tower, avoiding local retention, and enhancing the gas-liquid contact effect. The rotation of the first fan further disperses the tail gas, causes it to rise evenly, prevents airflow short-circuiting, and improves the purification efficiency of the alkali solution spray. The water in the rotating tank enters the interior of the first fan through the water inlet hole of the rotating shaft and is rotated and sprayed out from the water spray port of the fan blade to form a fine water mist, which greatly increases the gas-liquid contact area, effectively reduces the tail gas temperature, and reduces the escape of volatile organic matter. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is an overall structural diagram of the multi-stage spray-adsorption deep purification equipment for naphthalenesulfonic acid production tail gas of the present invention;

[0016] Figure 2 This is a diagram showing the internal structure of the multi-stage spray-adsorption deep purification equipment for tail gas from naphthalenesulfonic acid production of the present invention;

[0017] Figure 3 This is a diagram showing the internal structure of the spray tower of the present invention;

[0018] Figure 4 This is a structural diagram of the water spray assembly of the present invention;

[0019] Figure 5 This is a structural diagram of a first fan of the present invention;

[0020] Figure 6 This is a structural diagram of the connection between the cyclone separator and the adsorption box of the present invention.

[0021] In the figure: 1. Spray tower; 11. Conical liquid collecting tank; 111. Disperser plate; 12. Exhaust gas inlet pipe; 13. Water spray assembly; 131. Column; 1311. Water inlet trough; 1312. Rotating trough; 132. Water inlet pipe; 133. First fan; 1331. Rotating shaft; 13311. Water inlet hole; 1332. Turbine; 1333. Water nozzle; 14. Gas collecting hood; 15. Alkali solution spray pipe; 16. Filler; 161. Corrugated plate; 2. Cyclone separator; 21. Drive motor; 22. Second fan; 23. Partition; 24. Air collecting port; 25. Spiral blade; 3. Adsorption box; 31. High-efficiency activated carbon layer; 4. Waste liquid collection tank. DETAILED DESCRIPTION

[0022] 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.

[0023] In order to solve the problems of low purification efficiency, easy clogging, and secondary pollution in single alkali solution spraying or activated carbon adsorption, the synergistic optimization of multi-stage spraying and adsorption processes is insufficient, making it difficult to achieve deep purification of tail gas and resource recovery. Figures 1-6 , this embodiment provides the following technical solutions:

[0024] A multi-stage spray-adsorption deep purification device for tail gas from naphthalenesulfonic acid production comprises a spray tower 1, a cyclone separator 2 and an adsorption box 3. After spray treatment in the spray tower 1, most of the SO2 and acid gases in the tail gas from the naphthalenesulfonic acid production are removed. The gas enters the cyclone separator 2 to separate droplets and particulate matter in the tail gas. The adsorption box 3 is provided with a layer 31 filled with high-efficiency activated carbon to adsorb naphthalene vapor and organic components, thereby deeply purifying the tail gas from the naphthalenesulfonic acid production.

[0025] Specifically, a conical liquid collecting trough 11 is provided at the bottom of the spray tower 1, and the lower end of the conical liquid collecting trough 11 is connected to the waste liquid collection tank 4 through a pipe. A dispersion plate 111 is provided on the upper surface of the conical liquid collecting trough 11, and air holes are evenly distributed on the dispersion plate 111. A tail gas inlet pipe 12 is provided on one side of the spray tower 1, and one end of the tail gas inlet pipe 12 extends to the lower end of the dispersion plate 111. The tail gas enters the spray tower 1 through the tail gas inlet pipe 12. The cone-shaped liquid collecting trough 11 is filled with spray liquid due to continuous spraying. The tail gas is passed into the collected spray liquid through the tail gas inlet pipe 12 to achieve contact between the tail gas and the spray liquid, and the tail gas is initially cooled. The tail gas overflowing from the collected spray liquid is evenly dispersed and rises under the action of the dispersion plate 111.

[0026] More specifically, a water spray assembly 13 is provided in the middle of the upper surface of the dispersion plate 111. The water spray assembly 13 includes a column 131, a water inlet pipe 132, and a first fan 133. The lower end of the column 131 is fixedly connected to the upper surface of the dispersion plate 111. A water inlet groove 1311 is provided in the column 131. The water inlet pipe 132 passes through the water inlet groove 1311. A rotating shaft 1331 is provided at the lower end of the first fan 133. The rotating shaft 1331 passes through the water inlet groove 1311. The rotating shaft 1331 is placed at the position of the water inlet trough 1311 and a turbine 1332 is provided. The rotating shaft 1331 is perpendicular to the direction of the water inlet pipe 132. After the water from the water inlet pipe 132 enters the water inlet trough 1311, it drives the turbine 1332 in the water inlet trough 1311 to rotate, and controls the rotation of the first fan 133 connected to the turbine 1332. The rotation of the first fan 133 drives the air flow in the spray tower 1 upward, accelerates the upward movement of the exhaust gas, and further disperses the exhaust gas.

[0027] It should be noted that the upper end of the column 131 is provided with a rotating groove 1312, the end of the water inlet pipe 132 is connected to the rotating groove 1312, and the water in the water inlet pipe 132 eventually flows into the rotating groove 1312. At the same time, the rotating shaft 1331 passes through the rotating groove 1312, and the rotating shaft 1331 is provided with a sealing ring at the position outside the rotating groove 1312. The rotating shaft 1331 is provided with a water inlet hole 13311 at the position inside the rotating groove 1312. The water inlet hole 13311 is connected to the first air inlet hole 13311. The fan 133 is internally connected, and a water spray port 1333 is provided on the blades of the first fan 133. The water spray port 1333 is connected to the water inlet hole 13311. The first fan 133 rotates in the rotating groove 1312 through the rotating shaft 1331. There is water introduced into the rotating groove 1312 by the water inlet pipe 132. The water inlet hole 13311 is soaked in the water and the water is directed to the water spray port 1333. As the first fan 133 rotates, the water spray port 1333 rotates and sprays the water out to cool the rising exhaust gas.

[0028] In this embodiment, an air collecting hood 14 is provided at the upper end of the spray tower 1, an alkali solution spray pipe 15 is provided in the spray tower 1 below the air collecting hood 14, and a filler 16 is provided below the alkali solution spray pipe 15. The alkali solution spray pipe 15 sprays alkali solution into the spray tower 1, and contacts with the exhaust gas flowing upstream to eliminate most of SO2 and acidic gases. A corrugated plate 161 is provided in the filler 16, which is separated by the corrugated plate 161 to extend the time for the exhaust gas to pass through and ensure that the exhaust gas is fully in contact with the alkali solution.

[0029] like Figure 6 As shown, the air inlet pipe of the cyclone separator 2 is connected to the air collecting cover 14, and the tail gas after the alkali solution spraying is led into the cyclone separator 2. The upper end of the cyclone separator 2 is provided with a driving motor 21, and the output end of the driving motor 21 is connected to the second fan 22. The second fan 22 is connected to the gas output end of the cyclone separator 2. A partition 23 is provided below the second fan 22 in the cyclone separator 2. The lower surface of the partition 23 is provided with an air collecting port 24. The outer wall of the air collecting port 24 is opposite to the air inlet pipe of the cyclone separator 2, and the outer circle of the air collecting port 24 is provided with a fan. A spiral blade 25 is provided on the partition 23. The exhaust gas entering the cyclone separator 2 spirals downward under the guidance of the spiral blade 25. Under the centrifugal force, the droplets and particulate matter in the exhaust gas are thrown to the side wall of the cyclone separator 2, and the gas spirals upward in the center of the cyclone separator 2 and enters the air collecting port 24. The second fan 22 works above the air collecting port 24 to accelerate the upward airflow and direct the rising airflow to the adsorption box 3. The bottom of the cyclone separator 2 is connected to the waste liquid collection pool 4, and the collected droplets and particulate matter are collected and recycled by the waste liquid collection pool 4.

[0030] In this embodiment, the adsorption box 3 is provided with at least three layers of high-efficiency activated carbon layers 31. The high-efficiency activated carbon layers 31 are loaded with metal oxides, taking into account high adsorption capacity, acid corrosion resistance and catalytic oxidation ability. The specific processing method is as follows:

[0031] A mixture of high-specific-surface-area coconut shell activated carbon and coal-based columnar activated carbon was selected. The advantages of the coconut shell activated carbon's well-developed micropores were utilized to adsorb organic matter such as naphthalene. The coal-based columnar activated carbon had high mechanical strength and was suitable for high airflow impact. The mixed activated carbon was soaked in 5% dilute nitric acid for 2 hours to remove ash and increase surface oxygen-containing functional groups, such as -COOH and -OH, to improve the metal oxide loading efficiency. The mixture was then washed with water until neutral, dried at 105°C for 4 hours.

[0032] Preparation of impregnation solution:

[0033] Dissolve Fe(NO3)3·9H2O and Cu(NO3)2·3H2O (molar ratio 2:1) in deionized water to a concentration of 0.5 mol / L, and add 1% citric acid as a complexing agent to prevent premature precipitation of metal ions;

[0034] Dipping process:

[0035] The activated carbon and impregnation solution were mixed in a mass ratio of 1:5, and ultrasound was used at 40 kHz for 30 min to promote the infiltration and stirred at 60 °C for 6 h to ensure uniform loading.

[0036] Drying and calcination:

[0037] After drying at 80℃, calcination was carried out at 350℃ for 2h under N2 protection to decompose the nitrate into Fe2O3-CuO composite oxide;

[0038] Silanization treatment:

[0039] The loaded activated carbon was immersed in an ethanol solution of 3-aminopropyltriethoxysilane (5% v / v), reacted at 60° C. for 4 hours, and dried to form a hydrophobic layer to reduce the adhesion of sulfonic acid droplets.

[0040] Add 3% polyvinyl alcohol binder and extrude into honeycomb shape to improve air flow.

[0041] Working process: The tail gas from naphthalenesulfonic acid production enters the spray tower 1 through the tail gas inlet pipe 12. The spray liquid collected by the conical liquid collecting tank 11 is initially cooled and some pollutants are removed. Under the action of the dispersion plate 111 of the conical liquid collecting tank 11, the tail gas is evenly distributed and initially cooled. During the rising process, the tail gas encounters the water mist sprayed by the water spray assembly 13, which further cools it down. The tail gas is accelerated upward by the first fan 133 and contacts the alkali solution sprayed by the alkali solution spray pipe 15 in countercurrent. The corrugated plate 161 in the packing layer 16 prolongs the contact time, and most of the SO 2 and acidic gases are neutralized and absorbed. The tail gas after primary purification enters the cyclone separator 2, where the spiral blades 25 cause the droplets and particulate matter to centrifugally settle. The droplets and particulate matter are thrown to the side wall due to centrifugal force and collected in the waste liquid collection tank 4. The gas rises through the air collecting port 24 and continues to rise after being accelerated by the second fan 22; the tail gas passes through the multi-layer high-efficiency activated carbon layer 31 in the adsorption box 3, and the Fe2O3-CuO composite oxide supported by the activated carbon catalyzes the oxidation and adsorption of naphthalene vapor and organic components to achieve deep purification.

[0042] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0043] While the embodiments of the present invention have been shown and described, it will be apparent to those skilled in the art that various changes, modifications, substitutions, and alterations can be made to the embodiments without departing from the principles and spirit of the invention.

Claims

1. A multi-stage spray-adsorption deep purification device for tail gas from naphthalenesulfonic acid production, comprising a spray tower (1), a cyclone separator (2) and an adsorption box (3) connected in sequence, characterized in that: The spray tower (1) is provided with a conical liquid collecting tank (11), a dispersion plate (111), a packing layer (16) and an alkali solution spray pipe (15) in sequence from bottom to top; a tail gas inlet pipe (12) inserted below the dispersion plate (111) is provided on one side of the spray tower (1); a water spray assembly (13) is provided on the upper surface of the dispersion plate (111); the air inlet of the cyclone separator (2) is connected to the top of the spray tower (1), and the air outlet of the cyclone separator (2) is connected to the adsorption box (3); and a high-efficiency activated carbon layer (31) is provided in the adsorption box (3).

2. The multi-stage spray-adsorption deep purification equipment for naphthalenesulfonic acid production tail gas according to claim 1, wherein The water spray assembly (13) comprises a column (131), a water inlet pipe (132) and a first fan (133). The lower end of the column (131) is fixedly connected to the upper surface of the dispersion plate (111). A water inlet groove (1311) is provided in the column (131). The water inlet pipe (132) passes through the water inlet groove (1311). A rotating shaft (1331) is provided at the lower end of the first fan (133). The rotating shaft (1331) passes through the water inlet groove (1311). A turbine (1332) is provided at the position where the rotating shaft (1331) is placed in the water inlet groove (1311).

3. The multi-stage spray-adsorption deep purification equipment for naphthalenesulfonic acid production tail gas according to claim 2, wherein A rotating groove (1312) is provided at the upper end of the column (131), the end of the water inlet pipe (132) is communicated with the rotating groove (1312), the rotating shaft (1331) passes through the rotating groove (1312), and a sealing ring is provided at a position where the rotating shaft (1331) is located outside the rotating groove (1312), and a water inlet hole (13311) is provided at a position where the rotating shaft (1331) is located inside the rotating groove (1312), and the water inlet hole (13311) is communicated with the interior of the first fan (133).

4. The multi-stage spray-adsorption deep purification equipment for naphthalenesulfonic acid production tail gas according to claim 3, wherein A water spray port (1333) is provided on the fan blade of the first fan (133), and the water spray port (1333) is communicated with the water inlet hole (13311).

5. The multi-stage spray-adsorption deep purification equipment for naphthalenesulfonic acid production tail gas according to claim 1, characterized in that: A corrugated plate (161) is provided in the filler (16).

6. The multi-stage spray-adsorption deep purification equipment for naphthalenesulfonic acid production tail gas according to claim 1, characterized in that: A driving motor (21) is provided at the upper end of the cyclone separator (2); the output end of the driving motor (21) is connected to a second fan (22); the second fan (22) is communicated with the gas output end of the cyclone separator (2); a partition (23) is provided below the second fan (22) in the cyclone separator (2); and an air collecting port (24) is provided on the lower surface of the partition (23).

7. The multi-stage spray-adsorption deep purification equipment for naphthalenesulfonic acid production tail gas according to claim 6, characterized in that: The outer ring partition (23) of the air collecting port (24) is provided with spiral blades (25), and the cyclone separator (2) is connected to a waste liquid collection tank (4), and the collected droplets and particulate matter are collected and recycled by the waste liquid collection tank (4).

8. The multi-stage spray-adsorption deep purification equipment for naphthalenesulfonic acid production tail gas according to claim 1, characterized in that: The high-efficiency activated carbon layer (31) is provided with no less than three layers, and the high-efficiency activated carbon layer (31) is loaded with metal oxides.

9. The multi-stage spray-adsorption deep purification equipment for naphthalenesulfonic acid production tail gas according to claim 8, characterized in that: The processing method of the high-efficiency activated carbon layer (31) is as follows: using dilute nitric acid to soak the activated carbon, washing with water and drying; using Fe(NO3)3·9H2O and Cu(NO3)2·3H2O mixed solution for ultrasonic impregnation, and calcining under N2 protection, and finally silanization treatment to form.

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