Reactor and reaction device

Abstract

The utility model relates to the field of chemical engineering and environmental protection, and discloses a reactor and a reaction device.The reactor comprises a reactor body, a liquid phase zone located on the lower portion and a gas phase zone located on the upper portion are arranged in the reactor body, the liquid phase zone is used for containing liquid phase substances, the gas phase zone is used for containing gas phase substances, and the reactor body of the liquid phase zone is made of carbon steel; the reactor body is made of carbon steel, the inner wall of the reactor body is coated with a nonmetal first corrosion-resistant coating, the reactor body in the gas phase region is made of high alloy steel, the reactor is made of cheap carbon steel for the liquid phase region with high chloride ion concentration, and the inner wall of the reactor is coated with a corrosion-resistant coating. The reactor has two characteristics of corrosion resistance and low production cost, and the reactor is made of high alloy steel with excellent oxidation resistance aiming at a gas phase region with strong oxidizing property, so that the service life of the reactor is ensured while the production cost is effectively controlled, the continuous operation period of the reaction device is effectively prolonged, and the operation cost is reduced.

Description

Technical Field

[0001] The utility model relates to the fields of chemical industry and environmental protection, and in particular to a reactor and a reaction device. Background Art

[0002] Ozone itself has a strong oxidizing effect. Catalytic ozone oxidation technology is a highly effective industrial wastewater treatment technology. Compared with other advanced oxidation processes, it offers lower investment and operating costs, making it a hot topic in wastewater treatment in recent years. When used in wastewater treatment, the core equipment is the catalytic ozone oxidation reactor. Within this reactor, ozone oxidizes or degrades harmful substances in the wastewater, ensuring that the industrial wastewater meets discharge requirements.

[0003] Therefore, the long-term stable operation of the ozone catalytic oxidation reactor, which is the core equipment, is related to the stable operation of the entire ozone catalytic oxidation device, and is also related to the operating costs of the ozone catalytic oxidation device.

[0004] Industrial wastewater usually contains a large amount of chloride ions, which are highly corrosive. As the end point, the water quality of the wastewater is usually unstable and is prone to fluctuations beyond design expectations.

[0005] At present, the main body of the ozone catalytic oxidation reactor is generally made of the same material, and its overall materials include austenitic stainless steel, duplex steel, steel-lined PTFE, steel-lined PO, steel-lined fiberglass, etc. Among them, austenitic stainless steel has limited resistance to chloride ions. When the water quality fluctuates, especially when the chloride ion content increases, austenitic stainless steel is prone to intergranular corrosion, which greatly reduces the mechanical strength of the metal shell; duplex steel and steel-lined PTFE have good resistance to chloride ion corrosion, but the cost of the reactor is relatively high and it is not competitive in the market; steel-lined PO has excellent resistance to chloride ion corrosion, but when there is a gas phase space at the top of the ozone catalytic oxidation reactor, the PO material as the corrosion-resistant layer will quickly undergo oxidation aging and partial shedding in the ozone environment, resulting in high maintenance costs and long maintenance periods; steel-lined fiberglass is widely used in wastewater storage tanks, but it is not suitable for ozone catalytic oxidation reactors with internal parts (such as fillers, catalysts, etc.), and the reactor design life is short and the economic efficiency is poor. In summary, the current ozone catalytic oxidation reactors all have certain defects. Utility Model Content

[0006] The purpose of the utility model is to overcome the problems of limited chloride ion resistance, easy aging of the lining or high cost of existing reactors, and to provide a reactor and a reaction device. The reactor has good chloride ion resistance, and the lining is not easy to age, while the production cost is low and it is suitable for market application.

[0007] In order to achieve the above-mentioned purpose, the first aspect of the present invention provides a reactor, wherein the reactor includes a reactor body, and a liquid phase zone located at the lower part and a gas phase zone located at the upper part of the reactor body are provided, wherein the liquid phase zone is used to accommodate liquid phase substances, and the gas phase zone is used to accommodate gas phase substances, the material of the reactor body in the liquid phase zone is carbon steel, and the inner wall thereof is coated with a non-metallic first corrosion-resistant coating, and the material of the reactor body in the gas phase zone is high alloy steel.

[0008] The medium in the middle and lower sections of the ozone catalytic oxidation reactor is a liquid phase. The main components of the liquid phase are industrial wastewater and a small amount of ozone. The corrosiveness of the liquid phase medium comes from the chloride ions and other ions in the wastewater. Therefore, carbon steel with good corrosion resistance and low price is selected for the liquid phase area, and a layer of corrosion-resistant material is lined on its inner wall. Since the ozone concentration in the liquid phase is relatively low and the corrosion-resistant layer is immersed in the liquid phase, the corrosion-resistant layer material hardly ages. The upper section of the ozone catalytic oxidation reactor is a gas phase space, the main components of which are ozone, oxygen, and entrained water mist. The medium characteristics of this section are mainly manifested in the strong oxidizing effect of ozone and the corrosion of a small amount of water mist. Therefore, high-alloy steel with good oxidation resistance and trace chloride ion corrosion resistance is selected for this part, and its inner wall no longer needs to be coated.

[0009] The utility model selects different materials according to the characteristics of media in different sections, so that the reactor has good corrosion resistance and oxidation resistance, avoids aging of the inner lining layer, and reduces the cost of the reactor.

[0010] In this application, carbon steel refers to an iron-carbon alloy with a carbon content of 0.0218-2.11 wt%, also known as plain carbon steel. High-alloy steel refers to an alloy steel containing at least 10 wt% of alloying elements. Both types of steel are readily available, and various types of carbon steel and high-alloy steel are commercially available. The carbon steel and high-alloy steel used in this application are commercially available products, and there are no specific requirements for their specific types.

[0011] Preferably, an annular sealing plate is provided in the reactor body below the gas phase zone, the outer edge of the sealing plate is fixedly connected to the inner wall of the reactor body, the inner circle of the sealing plate forms a channel, and the material of the sealing plate is the same as that of the reactor body in the gas phase zone;

[0012] The upper edge of the first corrosion-resistant coating extends upward to the lower surface of the sealing plate to form a second corrosion-resistant coating.

[0013] With the above structure, the rising gas phase can enter the gas phase zone through the channel formed by the inner circle of the sealing plate. The upper end of the corrosion-resistant coating is sealed by the sealing plate, forming a complete and continuous structure, which can effectively avoid the hidden danger of the corrosion-resistant layer falling off due to structural discontinuity. The second corrosion-resistant coating in the gas phase zone is close to the liquid phase zone at the same time, and some liquid will be entrained in the rising gas, which reduces the concentration of the oxidizing gas and makes this part of the second corrosion-resistant coating less likely to show obvious aging phenomena.

[0014] Preferably, the upper edge of the second corrosion-resistant coating extends along the lower surface of the sealing plate to cover the lower surface of the sealing plate, forming a third corrosion-resistant coating. With this structure, on the one hand, the third corrosion-resistant coating allows the second corrosion-resistant coating to continue to form a continuous structure, avoiding possible cracking in the upper section of the second corrosion-resistant coating. On the other hand, because the third corrosion-resistant coating is located in the gas-liquid interface transition zone, the liquid entrained by the rising gas reduces the concentration of the oxidizing gas, making this portion of the corrosion-resistant coating less susceptible to significant aging.

[0015] Preferably, the height of the second corrosion-resistant coating is 80-150 mm. If the height of the second corrosion-resistant coating is too low or too high, it will affect its corrosion resistance and whether it will crack. The height selected in this application takes both into account and ensures its service life.

[0016] Preferably, the width of the sealing plate is 50-150 mm. This structure not only provides a continuous structure for the corrosion-resistant coating, but also ensures smooth ascent of the rising gas. The width of the sealing plate can be any value between any two of 50 mm, 80 mm, 100 mm, 120 mm, and 150 mm.

[0017] Preferably, the first, second, and third corrosion-resistant coatings are made of the same material, selected from any one of propylene oxide, polyethylene, and polypropylene, and have a thickness of 10-15 mm. When the first, second, and third corrosion-resistant coatings are made of the same material, selected from any one of propylene oxide, polyethylene, and polypropylene, their thickness can be any value between any two of 10 mm, 12 mm, and 15 mm. There are no particular requirements for the specific types of propylene oxide, polyethylene, and polypropylene, as long as they are commercially available products.

[0018] Preferably, the first, second, and third corrosion-resistant coatings are made of the same epoxy resin material, and have a thickness of 3-5 mm. When the first, second, and third corrosion-resistant coatings are made of the same epoxy resin material, their thickness can be any value between any two of 3 mm, 4 mm, and 5 mm. There are no particular requirements for the specific choice of epoxy resin; any commercially available product can be used.

[0019] By adopting the above solution and selecting different thicknesses according to different materials, it is possible to effectively ensure its corrosion resistance and control production costs.

[0020] Preferably, the high-alloy steel is austenitic stainless steel or duplex stainless steel. Austenitic stainless steel or duplex stainless steel has excellent oxidation resistance. The present application uses this material for the gas phase section to ensure reactor life while avoiding excessive production costs. There are no specific requirements for the specific type of austenitic or duplex stainless steel; commercially available products such as S31603 or S22053 are sufficient.

[0021] There are no special requirements for the specific model of carbon steel, and commercially available products such as Q235B, Q245R, Q345R, etc.

[0022] Preferably, the height ratio of the liquid phase region to the gas phase region is 15-25:3. For ozone catalytic oxidation treatment of wastewater, the liquid phase region can generally be divided into three parts from bottom to top. The bottom contains wastewater to be treated, oxygen, and ozone. The middle part has fillers and catalysts for catalytic oxidation. The upper area is for re-mixing of gas and liquid, while the gas phase region mainly collects the rising oxygen, ozone, etc. and then discharges them into other areas. Therefore, the height of the liquid phase region is generally much greater than that of the gas phase region, and the ratio of the heights of the two can be any value between any two values ​​of 15:3, 20:3, and 25:3.

[0023] The second aspect of the present invention provides a reaction device, which includes the reactor described in the first aspect of the present invention.

[0024] Through the above technical solution, this application targets the liquid phase region with a higher chloride ion concentration, and the material of the reactor is selected from economical carbon steel, and a corrosion-resistant coating is applied on its inner wall, so that it has both the characteristics of corrosion resistance and low production cost. For the gas phase region with strong oxidizing properties, the material of the reactor is selected from high-alloy steel with excellent oxidation resistance, thereby effectively controlling the production cost while ensuring the life of the reactor.

[0025] The reactor provided in this application is not only suitable for ozone catalytic oxidation treatment of wastewater, but can also be used in other reactions with the same or similar characteristics. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the structure of the reactor.

[0027] Description of Reference Numerals

[0028] 1-reactor body; 2-gas phase zone; 3-sealing plate; 4-liquid phase zone; 5-first corrosion-resistant coating; 6-second corrosion-resistant coating; 7-third corrosion-resistant coating; 8-top cover. DETAILED DESCRIPTION

[0029] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0030] The terms "first", "second", etc. are used to distinguish similar objects and are not used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable under appropriate circumstances so that the embodiments of the present application can be implemented in an order other than those illustrated or described herein. The objects distinguished by "first", "second", etc. are generally of the same type and do not limit the number of objects. For example, the first object can be one or more.

[0031] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

[0032] Example 1

[0033] like Figure 1 As shown, a reactor comprises a reactor body 1, wherein a liquid phase zone 4 is provided at the lower portion and a gas phase zone 2 is provided at the upper portion of the reactor body 1, wherein the liquid phase zone 4 is used to accommodate liquid phase substances, and the gas phase zone 2 is used to accommodate gas phase substances, and the material of the reactor body 1 of the liquid phase zone 4 is carbon steel, and a non-metallic first corrosion-resistant coating 5 is coated on its inner wall, and the material of the reactor body 1 of the gas phase zone 2 is high alloy steel.

[0034] Among them, the height ratio of the liquid phase zone 4 and the gas phase zone 2 is 15-25:3, the bottom of the liquid phase zone 4 has a liquid inlet for liquid entry and a gas supply port for oxygen and ozone entry (not shown in the figure), the middle of the liquid phase zone 4 has a filler and a catalyst (not shown in the figure), and the top of the gas phase zone is closed by a top cover 8, and the material of the top cover 8 is the same as the material of the reactor body 1 of the gas phase zone 2.

[0035] The high alloy steel is austenitic stainless steel or duplex stainless steel. There is no particular requirement for the specific types of carbon steel and austenitic or duplex stainless steel, and existing commercially available products can be used. For example, the carbon steel type can be Q345R, Q235B, Q245R, and the stainless steel type can be S31603 or S22053.

[0036] An annular sealing plate 3 is provided in the reactor body 1 at the lower part of the gas phase zone 2. The outer edge of the sealing plate 3 is fixedly connected to the inner wall of the reactor body 1. The inner circle of the sealing plate 3 forms a channel for gas to pass through. The material of the sealing plate 3 is the same as that of the reactor body 1 in the gas phase zone 2. The upper edge of the first corrosion-resistant coating 5 extends upward to the lower surface of the sealing plate 3 to form a second corrosion-resistant coating 6.

[0037] Furthermore, the upper edge of the second corrosion-resistant coating 6 extends along the lower surface of the sealing plate 3 to cover the lower surface of the sealing plate 3 to form a third corrosion-resistant coating 7. In some embodiments, the materials of the first corrosion-resistant coating 5, the second corrosion-resistant coating 6 and the third corrosion-resistant coating 7 can be the same or different, as long as they are all non-metallic and corrosion-resistant.

[0038] In this example, the first corrosion-resistant coating 5, the second corrosion-resistant coating 6 and the third corrosion-resistant coating 7 are made of the same material and have the same thickness. They are integrally formed by rotational molding. When the material is selected from any one of propylene oxide, polyethylene or polypropylene, the thickness is 10-15 mm, wherein the height of the second corrosion-resistant coating is 80-150 mm, and the width of the sealing plate is 50-150 mm.

[0039] In some other embodiments, the material of the second corrosion-resistant coating 6 and the third corrosion-resistant coating 7 is the same as that of the first corrosion-resistant coating 5, and the thickness is also the same. They are integrally formed by rotational molding, and the material is epoxy resin material with a thickness of 3-5 mm. Among them, the height of the second corrosion-resistant coating is 80-150 mm, and the width of the sealing plate is 50-150 mm.

[0040] The present application also provides a reaction device, which includes the above-mentioned reactor.

[0041] This application selects composite materials based on the segmented characteristics of the medium in the ozone catalytic oxidation reactor and the obvious differences in corrosiveness and oxidizing properties of the medium in different segments. Specifically, carbon steel is selected for the liquid phase region with a high chloride ion content and is lined with a corrosion-resistant layer. For the gas phase region with strong oxidizing properties, high-alloy steel with excellent antioxidant properties is selected. Through the composite selection of materials, the corrosive requirements of different media in the reactor are met without significantly increasing costs and having an aesthetically pleasing appearance. This greatly extends the continuous and stable operation time of the ozone catalytic oxidation device, reduces the inspection and maintenance workload of operation and maintenance personnel, and reduces the operating costs of the ozone catalytic oxidation device, thus having great advantages in market competitiveness.

[0042] The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited thereto. Within the technical concept of the present invention, the technical solution of the present invention may be subjected to various simple modifications, including combining the specific technical features in any suitable manner. To avoid unnecessary repetition, the present invention will not further describe various possible combinations. However, these simple modifications and combinations should also be considered as disclosed in the present invention and fall within the scope of protection of the present invention.

Claims

1. A reactor, characterized in that The reactor includes a reactor body, which is provided with a liquid phase zone located at the bottom and a gas phase zone located at the top, wherein the liquid phase zone is used to accommodate liquid phase substances, and the gas phase zone is used to accommodate gas phase substances. The material of the reactor body in the liquid phase zone is carbon steel, and its inner wall is coated with a non-metallic first corrosion-resistant coating, and the material of the reactor body in the gas phase zone is high-alloy steel.

2. The reactor according to claim 1, characterized in that An annular sealing plate is provided in the reactor body at the lower part of the gas phase zone, the outer edge of the sealing plate is fixedly connected to the inner wall of the reactor body, the inner circle of the sealing plate forms a channel, and the material of the sealing plate is the same as that of the reactor body in the gas phase zone; The upper edge of the first corrosion-resistant coating extends upward to the lower surface of the sealing plate to form a second corrosion-resistant coating.

3. The reactor according to claim 2, characterized in that The upper edge of the second corrosion-resistant coating extends along the lower surface of the sealing plate to cover the lower surface of the sealing plate, forming a third corrosion-resistant coating.

4. The reactor according to claim 2 or 3, characterized in that The height of the second corrosion-resistant coating is 80-150 mm.

5. The reactor according to claim 2 or 3, characterized in that The width of the sealing plate is 50-150 mm.

6. The reactor according to claim 3, characterized in that The first corrosion-resistant coating, the second corrosion-resistant coating and the third corrosion-resistant coating are made of the same material, selected from any one of propylene oxide, polyethylene or polypropylene, and have a thickness of 10-15 mm.

7. The reactor according to claim 3, characterized in that The first corrosion-resistant coating, the second corrosion-resistant coating and the third corrosion-resistant coating are made of the same material, which is epoxy resin material, and have a thickness of 3-5 mm.

8. The reactor according to any one of claims 1 to 3, characterized in that The high alloy steel is austenitic stainless steel or duplex stainless steel.

9. The reactor according to any one of claims 1 to 3, characterized in that The height ratio of the liquid phase region to the gas phase region is 15-25:

3.

10. A reaction device, characterized in that: The reactor comprises the reactor described in any one of claims 1 to 9.

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