Multistage spray-adsorption deep purification equipment for naphthalenesulfonic acid production tail gas

Abstract

The application discloses a kind of multistage spray-adsorption deep purification equipment of naphthalenesulfonic acid production tail gas, belong to industrial waste gas processing technical field.The multistage spray-adsorption deep purification equipment of naphthalenesulfonic acid production tail gas of the application, including the spray tower, cyclone separator and adsorption box connected in sequence, the spray tower is sequentially provided with conical liquid collecting tank, dispersion plate, filler layer and lye spray pipe from below to above, the side of spray tower is provided with the tail gas inlet pipe inserted into the below of dispersion plate.The multistage spray-adsorption deep purification equipment of naphthalenesulfonic acid production tail gas proposed in the application, combine multistage spray, cyclone separation and adsorption technology, realize the efficient removal of SO2, acid gas and organic pollutants in naphthalenesulfonic acid production tail gas, using efficient waste gas treatment method reduces harmful substance emission, while recycling wastewater through waste liquid collection tank, the activated carbon layer of silanization treatment has good hydrophobicity.

Description

Technical Field

[0001] This invention relates to the field of industrial waste gas treatment technology, specifically to a multi-stage spray-adsorption deep purification device for naphthalene sulfonic acid production tail gas. Background Technology

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

[0003] The purpose of this invention is to provide a multi-stage spray-adsorption deep purification device for naphthalene sulfonic acid production tail gas. By combining multi-stage spraying, cyclone separation and adsorption technologies, it achieves efficient removal of SO2, acidic gases and organic pollutants from naphthalene sulfonic acid production tail gas. The efficient waste gas treatment method reduces the emission of harmful substances and solves the problems mentioned in the background art.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a multi-stage spray-adsorption deep purification device for naphthalenesulfonic acid production tail gas, comprising a spray tower, a cyclone separator, and an adsorption box connected in sequence. The spray tower is provided with a conical liquid collection tank, a dispersion plate, a packing layer, and an alkaline spray pipe arranged sequentially from bottom to top. A tail gas inlet pipe inserted below 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. A high-efficiency activated carbon layer is provided inside 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 provided inside 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 of the rotating shaft in the water inlet groove. The rotating shaft is perpendicular to the direction of the water inlet pipe. After the water from the water inlet pipe enters the water inlet groove, it drives the turbine in the water inlet groove to rotate, which 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, the upper end of the column is provided with a rotating groove, 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 the position of the rotating shaft outside the rotating groove. A water inlet hole is opened at the position of the rotating shaft inside the rotating groove, and the water inlet hole is connected to the inside of the first fan.

[0007] Preferably, the first fan blades are provided with water spray nozzles, which are connected to the water inlet. The first fan rotates in the rotating slot via a rotating shaft, and the water spray nozzles spray water out to cool the rising exhaust gas.

[0008] Preferably, the packing material is provided with a corrugated plate.

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

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

[0011] Preferably, the high-efficiency activated carbon layer has at least 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: the activated carbon is soaked in dilute nitric acid, washed and dried; ultrasonically impregnated with a mixture of Fe(NO3)3·9H2O and Cu(NO3)2·3H2O, calcined under N2 protection, and finally silanized to form the final product.

[0013] Compared with the prior art, the beneficial effects of the present invention are:

[0014] This invention proposes a multi-stage spray-adsorption deep purification device for naphthalene sulfonic acid production tail gas. Combining multi-stage spraying, cyclone separation, and adsorption technologies, it achieves efficient removal of SO2, acidic gases, and organic pollutants from naphthalene sulfonic acid production tail gas. The efficient waste gas treatment method reduces harmful substance emissions, while wastewater is recycled through a wastewater collection tank. The silanized activated carbon layer has good hydrophobicity, reducing sulfonic acid droplet adhesion and extending the service life of the adsorption material. The water spray assembly drives the turbine to rotate through the water flow in the inlet pipe, which in turn drives the first fan to rotate, forcibly guiding the tail gas upwards, improving the flow efficiency of the gas in the spray tower, avoiding local stagnation, and enhancing the gas-liquid contact effect. The rotation of the first fan further disperses the tail gas, causing it to rise evenly, preventing airflow short-circuiting, and improving the purification efficiency of the alkaline spray. Water in the rotating tank enters the first fan through the water inlet hole of the rotating shaft and is sprayed out from the spray nozzle of the fan blade, forming a fine water mist, significantly increasing the gas-liquid contact area, effectively reducing the tail gas temperature, and reducing the escape of volatile organic compounds. Attached Figure Description

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

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

[0017] Figure 3 This is a diagram of 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 the first fan of the present invention;

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

[0021] In the diagram: 1. Spray tower; 11. Conical liquid collection tank; 111. Dispersion plate; 12. Tail gas inlet pipe; 13. Water spray assembly; 131. Column; 1311. Water inlet tank; 1312. Rotating tank; 132. Water inlet pipe; 133. First fan; 1331. Rotating shaft; 13311. Water inlet hole; 1332. Turbine; 1333. Water spray nozzle; 14. Gas collection hood; 15. Alkali spray pipe; 16. Packing material; 161. Corrugated plate; 2. Cyclone separator; 21. Drive motor; 22. Second fan; 23. Baffle plate; 24. Air collection port; 25. Spiral blades; 3. Adsorption box; 31. High-efficiency activated carbon layer; 4. Waste liquid collection tank. Detailed Implementation

[0022] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] To address the issues of low purification efficiency, clogging, and secondary pollution associated with single-stage alkaline spraying or activated carbon adsorption, and to overcome the limitations of synergistic optimization between multi-stage spraying and adsorption processes, achieving deep purification of exhaust gases and resource recovery remains challenging. Please refer to [link to relevant documentation]. Figures 1-6 This embodiment provides the following technical solution:

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

[0025] Specifically, a conical liquid collection tank 11 is provided at the bottom of the spray tower 1. The lower end of the conical liquid collection tank 11 is connected to a waste liquid collection tank 4 through a pipe. A dispersion plate 111 is provided on the upper surface of the conical liquid collection tank 11. The dispersion plate 111 has evenly distributed air vents. A tail gas inlet pipe 12 is provided on one side of the spray tower 1. 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 conical liquid collection tank 11 collects spray liquid due to continuous spraying. The tail gas is introduced into the collected spray liquid through the tail gas inlet pipe 12 to achieve contact between the tail gas and the spray liquid, and to perform preliminary cooling of the tail gas. The tail gas overflowing from the collected spray liquid is dispersed and rises evenly under the action of the dispersion plate 111.

[0026] More specifically, a water spray assembly 13 is provided at the middle position 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 inside the column 131, and 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, and the rotating shaft 1331 passes through the water inlet groove 1311. Furthermore, a turbine 1332 is installed at the position of the rotating shaft 1331 in the water inlet tank 1311. 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 tank 1311, it drives the turbine 1332 in the water inlet tank 1311 to rotate, which controls the first fan 133 connected to the turbine 1332 to rotate. The rotation of the first fan 133 drives the airflow 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 a rotating groove 1312 is provided at the upper end of the column 131, and the end of the water inlet pipe 132 is connected to the rotating groove 1312. 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 a sealing ring is provided at the position of the rotating shaft 1331 outside the rotating groove 1312. A water inlet hole 13311 is opened at the position of the rotating shaft 1331 inside the rotating groove 1312. The water inlet hole 13311 is connected to the first air... The fan 133 is internally connected, and the fan blades of the first fan 133 are provided with a water spray nozzle 1333. The water spray nozzle 1333 is connected to the water inlet 13311. The first fan 133 rotates in the rotating groove 1312 through the rotating shaft 1331. Water is introduced into the rotating groove 1312 through the water inlet pipe 132. The water inlet 13311 is immersed in water and directs the water to the water spray nozzle 1333. As the first fan 133 rotates, the water spray nozzle 1333 sprays water out in a rotating manner to cool the rising exhaust gas.

[0028] In this embodiment, a gas collecting hood 14 is provided at the upper end of the spray tower 1, and an alkaline spray pipe 15 is provided inside the spray tower 1 below the gas collecting hood 14. A packing 16 is provided below the alkaline spray pipe 15. The alkaline spray pipe 15 sprays alkaline solution into the spray tower 1, which comes into contact with the countercurrent tail gas to eliminate most of the SO2 and acidic gases. A corrugated plate 161 is provided inside the packing 16 to separate the tail gas and prolong the time the tail gas passes through, ensuring that the tail gas and alkaline solution are fully in contact.

[0029] like Figure 6 As shown, the air inlet pipe of the cyclone separator 2 is connected to the gas collection hood 14, allowing the exhaust gas sprayed with alkaline solution to enter the cyclone separator 2. A drive motor 21 is installed at the upper end of the cyclone separator 2, and the output end of the drive motor 21 is connected to a second fan 22. The second fan 22 is connected to the gas output end of the cyclone separator 2. A baffle 23 is installed below the second fan 22 inside the cyclone separator 2, and an air collection port 24 is installed on the lower surface of the baffle 23. The outer wall of the air collection port 24 is opposite to the air inlet pipe of the cyclone separator 2, and the outer ring of the air collection port 24 is... The partition 23 is equipped with spiral blades 25. The exhaust gas entering the cyclone separator 2 moves downward spirally under the guidance of the spiral blades 25. Under centrifugal force, the droplets and particulate matter in the exhaust gas are thrown towards the side wall of the cyclone separator 2, while the gas spirals upward in the center of the cyclone separator 2 and enters the air collection port 24. The second fan 22 works above the air collection port 24 to accelerate the airflow upward and direct the rising airflow to the adsorption box 3. The bottom of the cyclone separator 2 is connected to the waste liquid collection tank 4, and the collected droplets and particulate matter are collected and recycled by the waste liquid collection tank 4.

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

[0031] High specific surface area coconut shell activated carbon and coal-based columnar activated carbon were selected and mixed. The coconut shell activated carbon was used to adsorb organic matter such as naphthalene by taking advantage of its well-developed micropores, while 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 the surface oxygen-containing functional groups, such as -COOH and -OH, to improve the loading efficiency of metal oxides. The mixture was washed with water until neutral and dried at 105℃ 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] Impregnation process:

[0035] Activated carbon and impregnation solution were mixed at a mass ratio of 1:5, and ultrasonically assisted at 40 kHz for 30 min to promote penetration. The mixture was then stirred at 60 ℃ for 6 hours to ensure uniform loading.

[0036] Drying and calcination:

[0037] After drying at 80℃, it is calcined at 350℃ for 2 hours under N2 protection to decompose nitrate into Fe2O3-CuO composite oxide;

[0038] Silanization treatment:

[0039] The loaded activated carbon was soaked in an ethanol solution (5% v / v) of 3-aminopropyltriethoxysilane and reacted at 60°C for 4 hours. After drying, a hydrophobic layer was formed, which reduced the adhesion of sulfonic acid droplets.

[0040] Adding 3% polyvinyl alcohol binder and extruding it into a honeycomb structure improves airflow.

[0041] Working process: The tail gas from naphthalene sulfonic acid production enters the spray tower 1 through the tail gas inlet pipe 12. The spray liquid collected by the conical collection tank 11 provides initial cooling and removes some pollutants. Under the action of the dispersion plate 111 in the conical collection tank 11, the tail gas is evenly distributed and initially cooled. During its ascent, the tail gas encounters water mist sprayed from the water spray assembly 13, further cooling it. It is then accelerated upwards by the first fan 133, coming into countercurrent contact with the alkali solution sprayed from the alkali solution spray pipe 15. The corrugated plates 161 in the packing layer 16 extend the contact time, dissipating most of the SO₂. 2. The acidic gas is neutralized and absorbed. The tail gas after primary purification enters the cyclone separator 2. Here, the droplets and particles are centrifuged and settled by the action of the spiral blades 25. The droplets and particles are thrown to the side wall and collected in the waste liquid collection tank 4 due to centrifugal force. The gas rises through the air collection 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. The Fe2O3-CuO composite oxide loaded on the activated carbon catalyzes oxidation and adsorbs naphthalene vapor and organic components, achieving deep purification.

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

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

Claims

1. A multi-stage spray-adsorption deep purification device for naphthalenesulfonic acid production tail gas, 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 sequentially provided with a conical liquid collecting groove (11), a dispersion plate (111), a filler (16) and a lye spraying pipe (15) from bottom to top, one side of the spray tower (1) is provided with a tail gas inlet pipe (12) inserted below the dispersion plate (111), and the upper surface of the dispersion plate (111) is provided with a water spraying assembly (13); the air inlet of the cyclone separator (2) is connected with the top of the spray tower (1), the air outlet of the cyclone separator (2) is connected with the adsorption box (3), and the high-efficiency activated carbon layer (31) is arranged in the adsorption box (3). The water spraying assembly (13) comprises a stand (131), a water inlet pipe (132) and a first fan (133), the lower end of the stand (131) is fixedly connected with the upper surface of the dispersion plate (111), the stand (131) is provided with a water inlet groove (1311), the water inlet pipe (132) penetrates through the water inlet groove (1311), the lower end of the first fan (133) is provided with a rotating shaft (1331), the rotating shaft (1331) penetrates through the water inlet groove (1311), and a turbine (1332) is arranged at the position of the rotating shaft (1331) in the water inlet groove (1311). The upper end of the stand (131) is provided with a rotating groove (1312), the tail end of the water inlet pipe (132) is communicated with the rotating groove (1312), the rotating shaft (1331) penetrates through the rotating groove (1312), a sealing ring is arranged at the position of the rotating shaft (1331) outside the rotating groove (1312), a water inlet hole (13311) is arranged at the position of the rotating shaft (1331) in the rotating groove (1312), the water inlet hole (13311) is communicated with the inside of the first fan (133), and a water spraying opening (1333) is arranged on the fan blade of the first fan (133) and communicated with the water inlet hole (13311). The upper end of the cyclone separator (2) is provided with a driving motor (21), the output end of the driving motor (21) is connected with a second fan (22), the second fan (22) is communicated with the gas outlet end of the cyclone separator (2), a partition plate (23) is arranged below the second fan (22) in the cyclone separator (2), the lower surface of the partition plate (23) is provided with a wind collecting opening (24), the partition plate (23) outside the wind collecting opening (24) is provided with a spiral blade (25), and the cyclone separator (2) is connected with a waste liquid collecting pool (4), and the collected liquid drops and particulate matters are collected and recycled by the waste liquid collecting pool (4).

2. The multi-stage spray-adsorption deep purification apparatus for naphthalenesulfonic acid production tail gas according to claim 1, characterized by, The filler (16) is provided with a corrugated plate (161).

3. The multi-stage spray-adsorption deep purification apparatus for naphthalenesulfonic acid production tail gas according to claim 1, characterized by, The high-efficiency activated carbon layer (31) is provided with not less than three layers, and the high-efficiency activated carbon layer (31) is loaded with metal oxides.

4. The multi-stage spray-adsorption deep purification apparatus for naphthalenesulfonic acid production tail gas according to claim 3, characterized by, The processing method of the high-efficiency activated carbon layer (31) is as follows: the activated carbon is soaked in dilute nitric acid, washed with water and dried; the activated carbon is ultrasonically impregnated in a mixed solution of Fe(NO3)3·9H2O and Cu(NO3)2·3H2O, calcined under N2 protection, and finally silanized and formed.

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