Catalytic ozonation reaction tower capable of being filled with catalyst filler in multi-stage manner

Abstract

The invention discloses a catalytic ozonation reaction tower capable of being filled with catalyst packing in multiple stages, which comprises a tower body, the tower body is filled with the catalyst packing in multiple stages, the height of the catalyst packing can reach 2-6m, the ozone utilization efficiency is promoted to be improved by 30-80%, the pollutant removal efficiency is promoted to be improved by 30-60%, and under the requirement of the same pollutant removal amount, the ozone utilization rate is improved by 30-80%. The investment of equipment such as an ozone generator and a reaction tower is reduced by 30-50%; each filler layer is provided with a backwashing gas distribution pipeline system and a backwashing water outlet, so that step-by-step backwashing operation can be realized, the height of the filler layers is low, a good expansion bed loosening effect is easily realized during backwashing, catalyst fillers are mutually rubbed and are not easy to scale and harden, SS (suspended solids) or sludge obtained by backwashing is more easily discharged from the backwashing water outlets, and the service life of the catalyst fillers is prolonged. The catalyst packing layer is kept clean, so that the catalytic ozonation reaction tower is in a high-efficiency state for a long time, the overhaul period of the reaction tower is shortened, and the service life of the catalyst is prolonged.

Description

Technical Field

[0001] The present invention relates to the field of sewage treatment, and particularly to an ozone catalytic oxidation reaction tower capable of being filled with catalyst fillers in multiple stages. Background Art

[0002] Ozone catalytic oxidation is a kind of advanced oxidation process in the sewage treatment process. As one of the effective means of sewage treatment, advanced oxidation has been widely and deeply applied in the field of sewage treatment. Ozone catalytic oxidation can directly oxidize the pollutants in the wastewater into carbon dioxide and water, without generating any new pollutants during the process, and the operation process mainly consumes electric energy, which is convenient for operation and management. Therefore, it has been widely applied in the stages of sewage pretreatment and advanced treatment. How to further improve the rate and efficiency of ozone catalytic oxidation, reduce the operation cost, and maintain the long-term high-efficiency and stable operation of the ozone catalytic oxidation process has always been a subject of continuous research in the sewage treatment industry.

[0003] Ozone catalytic oxidation is to introduce a catalyst on the basis of ozone oxidation to improve the rate and efficiency of the oxidation reaction. According to the different phases of the catalyst, it is divided into homogeneous catalytic oxidation and heterogeneous catalytic oxidation. Homogeneous catalysis often adds liquid catalysts (such as hydrogen peroxide), and the catalyst will flow out of the reactor together with the sewage, resulting in the need to continuously add the catalyst, and the additional reagent consumption leads to an increase in the operation cost, so it is less used in sewage treatment projects. Correspondingly, heterogeneous ozone catalytic oxidation uses solid catalysts. The active components of the ozone catalyst are fixed on the substrate through physical or chemical methods such as sintering, making it not easy to lose and maintaining the catalytic effect for a long time. In engineering, it is actually filled in the reaction tower in the form of fillers. Since the ozone catalytic oxidation reaction needs to keep the pollutants, ozone and the catalyst in close contact, the cleanliness of the solid catalyst material is particularly important. In actual operation, gas backwashing is mostly used to avoid problems such as fouling, caking, and sludge wrapping caused by water quality pollution. Another factor affecting the oxidation effect is the filling height of the catalyst. The higher the filling height, the longer the contact trajectory between ozone and sewage and the catalyst during the rising process, and the higher the removal efficiency of pollutants. However, if the catalyst filler layer is set too high, it will lead to incomplete backwashing. In addition, it will also cause it difficult for sludge or suspended matter to pass through the filler layer and be discharged out of the reaction tower. Therefore, the design of the ozone catalytic reaction tower is particularly crucial.

[0004] Based on this, the present invention proposes an ozone catalytic oxidation reaction tower capable of being filled with catalyst fillers in multiple stages. Summary of the Invention

[0005] The object of the present invention is to provide an ozone catalytic oxidation reaction tower capable of multi-stage filling of catalyst fillers, so as to solve the problems of the existing heterogeneous ozone catalytic oxidation reaction tower that on the one hand, the higher the filling height of the catalyst filler is, the better, and on the other hand, if the filler is filled too high, backwashing will be incomplete, the packing layer cannot be fully fluidized, resulting in sludge or suspended matter not being discharged, and it is easy to cause scaling and caking problems.

[0006] To achieve the above object, the present invention provides the following solutions:

[0007] The present invention provides an ozone catalytic oxidation reaction tower capable of multi-stage filling of catalyst fillers, including a tower body. An effluent weir is provided in the upper part of the tower body, and the effluent weir is connected to an outlet. A second catalyst filler layer is supported by a third support plate below the effluent weir. A second backwashing drain port is provided between the effluent weir and the second catalyst filler layer. A second pebble cushion layer is provided between the second catalyst filler layer and the third support plate. A second backwashing air distribution pipe system is supported by a second support plate below the third support plate, and the second backwashing air distribution pipe system is connected to a second backwashing air inlet. A first catalyst filler layer is supported by a first support plate below the second support plate. A first backwashing drain port is provided between the second support plate and the first catalyst filler layer. A first pebble cushion layer is provided between the first catalyst filler layer and the first support plate. A gas-liquid mixing water distribution pipe system is provided below the first support plate, and the gas-liquid mixing water distribution pipe system is connected to a gas-liquid mixing water inlet. A first backwashing air distribution pipe system is provided below the gas-liquid mixing water distribution pipe system, and the first backwashing air distribution pipe system is connected to a first backwashing air inlet. An inlet, a circulating outlet and a drain port are provided below the first backwashing air distribution pipe system.

[0008] Preferably, the overall height of the tower body is 6-10 m, and the diameter is 1-4 m. The tower body includes a tower shell, the material of which is 316L stainless steel, fiberglass or PP. A head is provided at the top of the tower shell, and a bottom plate is provided at the bottom.

[0009] Preferably, lifting lugs are provided on both sides of the tower shell.

[0010] Preferably, an observation port, a breathing valve port and a tail gas discharge port are provided on the head.

[0011] Preferably, the filling heights of both the second catalyst packing layer and the first catalyst packing layer are 0.5 - 2 m; the heights between the top of the first catalyst packing layer and the first backwash drain outlet, and between the top of the second catalyst packing layer and the second backwash drain outlet are both 0.3 - 0.8 m; the height between the top of the second catalyst packing layer and the weir is 1 - 1.5 m.

[0012] Preferably, the filling heights of both the second pebble cushion layer and the first pebble cushion layer are 0.3 - 1.2 m.

[0013] Preferably, the third support plate, the second support plate, and the first support plate all adopt the form of perforated plates, with a plate thickness of 10 - 30 mm and a small hole diameter of 2 - 8 mm.

[0014] Preferably, the heights between the first support plate and the bottom plate, and between the second support plate and the third support plate 22 are both 0.6 - 1.5 m.

[0015] Preferably, the side wall of the tower body is successively provided with a second feed inlet, a second maintenance opening, a first feed inlet, and a first maintenance opening from top to bottom, all with a specification of DN500 - DN1000. The second catalyst packing layer is matched with the position of the second feed inlet, the first catalyst packing layer is matched with the position of the first feed inlet, the second backwash gas distribution pipeline system is matched with the position of the second maintenance opening, and the first backwash gas distribution pipeline system is matched with the position of the first maintenance opening.

[0016] Preferably, both the second backwash gas distribution pipeline system and the first backwash gas distribution pipeline system adopt gas backwashing, with a backwashing intensity of 10 - 30 L / m 2 ·s.

[0017] The present invention has achieved the following beneficial technical effects compared with the prior art:

[0018] 1. The present invention realizes the multi-stage filling of the catalyst packing in the reaction tower. The superimposed filling height of the catalyst packing can reach 2 - 6 m, while the packing height of the traditional single-layer catalyst-filled reaction tower is generally 0.5 - 4 m. The increase in the catalyst filling height promotes a 30% - 80% increase in the ozone utilization efficiency and a 30% - 60% increase in the pollutant removal efficiency. Under the requirement of the same pollutant removal amount, the investment in equipment such as ozone generators and reaction towers is reduced by 30% - 50%.

[0019] 2. The present invention sets up multi-stage catalyst packing filling layers. In actual production operation, the number of catalyst packing stages can be selectively filled according to the required effect, with great operation flexibility, and the cost of purchasing catalyst packing for users can be reduced.

[0020] 3. The present invention is provided with a backwashing air distribution pipeline system and a backwashing drain outlet for each layer of packing layer, which can realize step-by-step backwashing operation. The height of the packing layer is low, and it is easy to achieve a good expansion and loosening effect during backwashing, enabling the catalyst packings to rub against each other, making it difficult for the catalyst packings to scale and cake. At the same time, the SS or sludge washed out during backwashing is more easily discharged from the backwashing drain outlet, keeping the catalyst packing layer clean, enabling the ozone catalytic oxidation reaction tower to be in a high-efficiency state for a long time, reducing the maintenance period of the reaction tower, and extending the service life of the catalyst.

[0021] 4. The present invention reasonably arranges lifting lugs, feed inlets and maintenance openings, making installation and maintenance convenient. Description of the Drawings

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0023] Figure 1 It is a schematic diagram of the external structure of an ozone catalytic oxidation reaction tower that can be filled with catalyst packings in multiple stages provided by the present invention;

[0024] Figure 2 It is a schematic sectional structure diagram of an ozone catalytic oxidation reaction tower that can be filled with catalyst packings in multiple stages provided by the present invention;

[0025] In the figure: 1. Observation port; 2. Breather valve port; 3. Tail gas discharge port; 4. Head; 5. Water outlet; 6. Second-layer feed inlet; 7. Second-layer maintenance opening; 8. First-layer feed inlet; 9. First-layer maintenance opening; 10. First-layer backwashing air inlet; 11. Water inlet; 12. Gas-liquid mixed water inlet; 13. Circulation water outlet; 14. Drain port; 15. Second-layer backwashing air inlet; 16. First-layer backwashing drain outlet; 17. Second-layer backwashing drain outlet; 18. Lifting lug; 19. Weir; 20. Second-layer catalyst packing layer; 21. Second-layer pebble cushion layer; 22. Third-layer support plate; 23. Second-layer backwashing air distribution pipeline system; 24. Second-layer support plate; 25. First-layer catalyst packing layer; 26. First-layer pebble cushion layer; 27. First-layer support plate; 28. Gas-liquid mixed water distribution pipeline system; 29. First-layer backwashing air distribution pipeline system; 30. Tower body; 31. Bottom plate. Detailed Embodiments

[0026] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0027] The object of the present invention is to provide an ozone catalytic oxidation reaction tower capable of multi-stage filling of catalyst fillers to solve the problems existing in the prior art.

[0028] To make the above objects, features and advantages of the present invention more obvious and understandable, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0029] Embodiment 1:

[0030] This embodiment provides an ozone catalytic oxidation reaction tower capable of multi-stage filling of catalyst fillers. As shown in Figure 1 and Figure 2 , it includes a tower body. An effluent weir 19 is provided in the upper part of the tower body. The effluent weir 19 is connected to the water outlet 5. The second catalyst filler layer 20 is supported by a third support plate 22 below the effluent weir 19. A second backwash drain port 17 is provided between the effluent weir 19 and the second catalyst filler layer 20. A second pebble cushion layer 21 is provided between the second catalyst filler layer 20 and the third support plate 22. The second backwash gas distribution pipeline system 23 is supported by a second support plate 24 below the third support plate 22. The second backwash gas distribution pipeline system 23 is connected to the second backwash inlet 15. The first catalyst filler layer 25 is supported by a first support plate 27 below the second support plate 24. A first backwash drain port 16 is provided between the second support plate 24 and the first catalyst filler layer 25. A first pebble cushion layer 26 is provided between the first catalyst filler layer 25 and the first support plate 27. A gas-liquid mixing water distribution pipeline system 28 is provided below the first support plate 27. The gas-liquid mixing water distribution pipeline system 28 is connected to the gas-liquid mixing water inlet 12. A first backwash gas distribution pipeline system 29 is provided below the gas-liquid mixing water distribution pipeline system 28. The first backwash gas distribution pipeline system 29 is connected to the first backwash inlet 10. An inlet 11, a circulating water outlet 13 and a drain port 14 are provided below the first backwash gas distribution pipeline system 29.

[0031] As an implementation manner, the overall height of the tower body is 10 m and the diameter is 1.2 m.

[0032] As an implementation manner, the tower body includes a tower body 30. A head 4 is provided at the top of the tower body 30, and a bottom plate 31 is provided at its bottom.

[0033] As an implementation manner, the material of the tower body 30 is 316L stainless steel. Of course, in other embodiments, materials such as fiberglass or PP can also be used according to actual requirements.

[0034] As an implementation manner, lifting lugs 18 are provided on both sides of the tower body 30 to facilitate hoisting, installation and transportation.

[0035] As an implementation manner, an observation port 1, a breather valve port 2 and a tail gas discharge port 3 are provided on the head 4, which can be used for observation, installation of a breather valve and connection of tail gas treatment equipment respectively.

[0036] As an implementation manner, the filling heights of the second catalyst packing layer 20 and the first catalyst packing layer 25 are both 2m.

[0037] As an implementation manner, the heights between the top of the first catalyst packing layer and the first backwash drain port 16, and between the top of the second catalyst packing layer and the second backwash drain port 17 are both 0.3m.

[0038] As an implementation manner, the height between the top of the second catalyst packing layer 20 and the weir 19 is 1m.

[0039] As an implementation manner, the filling heights of the second pebble cushion layer 21 and the first pebble cushion layer 26 are both 0.3m.

[0040] As an implementation manner, the third support plate 22, the second support plate 24 and the first support plate 27 all adopt the form of perforated plates, with a plate thickness of 20mm and a small hole diameter of 4mm.

[0041] As an implementation manner, the heights between the first support plate 27 and the bottom plate 31, and between the second support plate 24 and the third support plate 22 are both 1.2m.

[0042] As an implementation manner, the side wall of the tower body 30 is successively provided with a second feed inlet 6, a second maintenance port 7, a first feed inlet 8 and a first maintenance port 9 from top to bottom, and their specifications are all DN500. The second catalyst packing layer 20 is matched with the second feed inlet 6 in position, the first catalyst packing layer 25 is matched with the first feed inlet 8 in position, the second backwash gas distribution pipeline system 23 is matched with the second maintenance port 7 in position, and the first backwash gas distribution pipeline system 29 is matched with the first maintenance port 9 in position, so as to facilitate loading and maintenance.

[0043] As an implementation manner, both the second backwash gas distribution pipeline system 23 and the first backwash gas distribution pipeline system 29 adopt gas backwashing, and the backwashing intensity is 25L / m2·s.

[0044] It should be understood that in this application, the tail gas discharge port 3 is connected to the tail gas destructor pipeline, the breather valve port 2 is connected to the breather valve, the water outlet 5 is connected to the water outlet pipeline, the second layer backwash drain port 17 is connected to the backwash drain pipeline, the second layer backwash air inlet 15 is connected to the external fan pipeline, the first layer backwash air inlet 10 is connected to the external fan pipeline, the water inlet 11 is connected to the water inlet pipeline, the gas-liquid mixed water inlet 12 is connected to the outlet pipeline of the high-efficiency dosing device, the circulating water outlet 13 is connected to the inlet pipeline of the high-efficiency dosing device, and the vent port 14 is connected to the vent pipeline; the above pipelines, components, and equipment are all prior arts in this field, and they are not the key points to be protected by this application, so their specific structures and working principles will not be elaborated herein.

[0045] When the ozone catalytic oxidation reaction tower capable of multi-stage filling of catalyst fillers provided by the present invention is in use, sewage enters from the water inlet 11 and undergoes ozone catalytic oxidation reaction through multiple packing layers, thereby achieving purification treatment. The treated sewage is discharged from the water outlet 5. Since each packing layer is provided with a backwash air distribution pipeline system and a backwash drain port, a step-by-step backwash operation is realized. The SS or sludge washed out is discharged from the backwash drain port, keeping the catalyst packing layer clean, and at the same time achieving a good expansion and fluidization effect, causing the catalyst fillers to rub against each other, and the catalyst fillers are not prone to fouling and caking.

[0046] The present invention elaborates on the principle and implementation manner of the present invention by applying specific examples. The description of the above embodiments is only used to help understand the method and its core idea of the present invention; at the same time, for those of ordinary skill in the art, there will be changes in the specific implementation manner and application scope according to the idea of the present invention. In summary, the content of this specification should not be construed as a limitation to the present invention.

Claims

1. An ozone catalytic oxidation reaction tower capable of being filled with catalyst fillers in multiple stages, characterized in that: The tower body comprises a tower body, wherein a water outlet weir is provided at the upper part of the tower body, the water outlet weir is connected to the water outlet, a second catalyst packing layer is supported by a third supporting plate below the water outlet weir, a second backwash drain outlet is provided between the water outlet weir and the second catalyst packing layer, a second pebble cushion layer is provided between the second catalyst packing layer and the third supporting plate, a second backwash air distribution pipeline system is supported by a second supporting plate below the third supporting plate, the second backwash air distribution pipeline system is connected to the second backwash air inlet, a first backwash air distribution pipeline system is supported by a first supporting plate below the second supporting plate A first layer of catalyst packing layer is provided, a first layer of backwash drain outlet is provided between the second layer of supporting plate and the first layer of catalyst packing layer, a first layer of pebble cushion is provided between the first layer of catalyst packing layer and the first layer of supporting plate, a gas-liquid mixed water distribution pipeline system is provided below the first layer of supporting plate, the gas-liquid mixed water distribution pipeline system is connected to the gas-liquid mixed water inlet, a first layer of backwash air distribution pipeline system is provided below the gas-liquid mixed water distribution pipeline system, the first layer of backwash air distribution pipeline system is connected to the first layer of backwash air inlet, and a water inlet, a circulating water outlet and a drain outlet are provided below the first layer of backwash air distribution pipeline system.

2. The ozone catalytic oxidation reaction tower capable of being filled with catalyst fillers in multiple stages according to claim 1, characterized in that: The overall height of the tower body is 6-10m, and the diameter is 1-4m. The tower body comprises a tower body, and its material is 316L stainless steel, fiberglass or PP. The top of the tower body is provided with a head, and the bottom of the tower body is provided with a bottom plate.

3. The ozone catalytic oxidation reaction tower capable of being filled with catalyst fillers in multiple stages according to claim 2, characterized in that: Lifting ears are arranged on both sides of the tower body.

4. The ozone catalytic oxidation reaction tower capable of being filled with catalyst fillers in multiple stages according to claim 2, characterized in that: The sealing head is provided with an observation port, a breathing valve port and an exhaust gas discharge port.

5. The ozone catalytic oxidation reaction tower capable of being filled with catalyst fillers in multiple stages according to claim 1, characterized in that: The filling heights of the second catalyst packing layer and the first catalyst packing layer are both 0.5-2m; the height between the top of the first catalyst packing layer and the first backwash drain port, and the height between the top of the second catalyst packing layer and the second backwash drain port are both 0.3-0.8m; the height between the top of the second catalyst packing layer and the outlet weir is 1-1.5m.

6. The ozone catalytic oxidation reaction tower capable of being filled with catalyst fillers in multiple stages according to claim 1, characterized in that: The filling heights of the second pebble cushion layer and the first pebble cushion layer are both 0.3-1.2 m.

7. The ozone catalytic oxidation reaction tower capable of being filled with catalyst fillers in multiple stages according to claim 1, characterized in that: The third layer supporting plate, the second layer supporting plate and the first layer supporting plate are all in the form of perforated plates with a plate thickness of 10-30 mm and a small hole diameter of 2-8 mm.

8. The ozone catalytic oxidation reaction tower capable of being filled with catalyst fillers in multiple stages according to claim 2, characterized in that: The height between the first supporting plate and the bottom plate, and the height between the second supporting plate and the third supporting plate 22 are both 0.6-1.5 m.

9. The ozone catalytic oxidation reaction tower capable of being filled with catalyst fillers in multiple stages according to claim 2, characterized in that: The side walls of the tower body are provided with a second-layer feed port, a second-layer inspection port, a first-layer feed port and a first-layer inspection port in sequence from top to bottom, and their specifications are all DN500-DN1000. The second-layer catalyst packing layer matches the position of the second-layer feed port, the first-layer catalyst packing layer matches the position of the first-layer feed port, the second-layer backwash air distribution pipeline system matches the position of the second-layer inspection port, and the first-layer backwash air distribution pipeline system matches the position of the first-layer inspection port.

10. The ozone catalytic oxidation reaction tower capable of being filled with catalyst fillers in multiple stages according to claim 1, characterized in that: The second layer backwash air distribution pipeline system and the first layer backwash air distribution pipeline system both use gas backwashing, and the backwashing intensity is 10-30L / m 2 ·s.

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