A reactor for a chlorine dioxide generator
By designing a trapezoidal structure and multi-stage reaction units, combined with an orthogonal array of filamentous catalysts, the problem of easy decomposition of chlorine dioxide concentration in the generator was solved, achieving efficient generation and stable operation.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- GUIZHOU WATER INVESTMENT TECHNOLOGY SERVICE CO LTD
- Filing Date
- 2025-05-23
- Publication Date
- 2026-06-30
AI Technical Summary
Existing chlorine dioxide generators suffer from poor reactor structure design, resulting in easy decomposition of chlorine dioxide concentration, low raw material conversion rate and purity, and unstable system operation.
The trapezoidal hollow cavity design increases the surface area of the reaction liquid, and the multi-stage reaction unit and the orthogonal array of filamentous catalysts extend the reaction time and improve the catalyst contact efficiency. Combined with the design of the reactor inlet pipe and aeration disc, it promotes gas-liquid-solid three-phase contact.
It significantly improves the purity and conversion rate of chlorine dioxide production, avoids the risk of decomposition caused by excessive concentration, and enhances the safety and stability of the system.
Smart Images
Figure CN224422801U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of chlorine dioxide preparation technology, specifically to a reactor for a chlorine dioxide generator. Background Technology
[0002] Chlorine dioxide, an internationally recognized highly effective disinfectant, possesses powerful bactericidal capabilities, effectively killing various microorganisms, including vegetative bacteria, bacterial spores, fungi, mycobacteria, and viruses, without inducing bacterial resistance. It is recommended by the World Health Organization as an AI-grade disinfectant. However, chlorine dioxide is difficult to store and transport, which necessitates the use of on-site chlorine dioxide generators for immediate application in places where large quantities of chlorine dioxide are used for disinfection.
[0003] Currently, the raw materials used in chlorine dioxide generators mainly include sodium chlorate, sodium chlorite, sulfuric acid (or hydrochloric acid), and reducing agents (such as hydrogen peroxide, urea, sucrose, etc.), or compound sodium chlorate and compound sodium bisulfate as raw materials. To improve the reaction efficiency, the concentration of raw materials used is generally high, resulting in a chlorine dioxide concentration in the reaction solution often exceeding 10%. However, when the chlorine dioxide concentration exceeds 10%, it is highly susceptible to decomposition, which in turn causes the chlorine dioxide generator to malfunction.
[0004] Regarding reactor structure, most existing chlorine dioxide generators adopt cylindrical or cuboid structures. These structures make it difficult for chlorine dioxide in the reaction solution to volatilize rapidly, further increasing the possibility of chlorine dioxide decomposition. Although some chlorine dioxide generators add catalysts to the reactor, the catalyst's distribution and structural design are unreasonable, preventing the catalyst from fully exerting its effectiveness. As a result, the raw material conversion rate and purity of the chlorine dioxide generator are at a low level. Utility Model Content
[0005] The purpose of this invention is to provide a reactor for a chlorine dioxide generator. The reactor includes a hollow inner cavity with a trapezoidal structure, which significantly increases the surface area of the reaction liquid compared to existing reactors. This allows chlorine dioxide in the reaction liquid to easily overflow into the gas phase space and be extracted, preventing the chlorine dioxide from decomposing due to excessive concentration and ensuring the safe and stable operation of the chlorine dioxide generator.
[0006] This utility model is achieved through the following technical solution:
[0007] A reactor for a chlorine dioxide generator, comprising:
[0008] The reactor body includes a trapezoidal hollow cavity, wherein the top area of the hollow cavity is larger than the bottom area of the hollow cavity.
[0009] The reaction unit is provided in multiple sets at the bottom reaction liquid area of the hollow inner cavity, and the adjacent reaction units are connected so that the raw materials entering the reaction liquid area can flow from the reaction unit in sequence.
[0010] In this design, the reactor utilizes a trapezoidal hollow cavity design to create a spatial layout where the reaction liquid area is wider at the top and narrower at the bottom. The enlarged surface area at the top significantly improves the volatilization efficiency of chlorine dioxide gas, effectively avoiding the risk of decomposition caused by concentrations exceeding 10%. The continuous arrangement of multiple reaction units, with their adjacent interconnected design, allows the raw materials to form a progressive flow path within the reaction liquid area. This extends the reaction time and promotes full contact between the catalyst and the reactants, thereby improving the raw material conversion rate and chlorine dioxide purity. Furthermore, the multi-stage reaction disperses the heat of reaction, further enhancing the safety and stability of the system operation.
[0011] As a further embodiment of the reactor, the ratio of the top area of the hollow inner cavity to the bottom area of the hollow inner cavity is 1:0.4 to 0.8.
[0012] In this scheme, by limiting the area ratio of the top to the bottom of the hollow cavity of the trapezoidal structure to 1:0.4 to 0.8, it not only ensures a significant increase in the surface area of the reaction liquid (more than 50% higher than the traditional cylindrical / cubic structure), but also avoids the problems of unstable reactor center of gravity or material waste caused by an excessively wide top.
[0013] As a further embodiment of the reactor, in order to maximize the volatilization efficiency of chlorine dioxide gas (controlling the concentration in the reaction liquid below a safe threshold) and avoid liquid stagnation or increased flow resistance due to an excessively wide top, the ratio of the top area to the bottom area of the hollow inner cavity is 1:0.5 to 0.6.
[0014] As a further embodiment of the reactor, each reaction unit includes a filamentous catalyst arranged in an array perpendicular to the direction of feed flow.
[0015] In this scheme, by arranging the filamentous catalyst in an array perpendicular to the direction of feed flow, a high-density three-dimensional catalytic network is formed. This forces the feed to penetrate the catalyst filament bundle multiple times during the flow process, significantly increasing the contact path and time between the reaction liquid and the catalyst. This orthogonal arrangement not only ensures the uniform distribution of the catalyst in the reaction liquid region, but also enhances the mass transfer efficiency through forced convection.
[0016] As a further embodiment of the reactor, the filamentous catalyst is positioned 20–30 mm away from the bottom and sides.
[0017] In this scheme, by maintaining a distance of 20-30 mm between the filamentous catalyst and the bottom and sides of the reactor, the problem of active site blockage caused by catalyst contact with the reactor wall or bottom deposits is effectively avoided while ensuring the stable fixation of the catalyst.
[0018] As a further embodiment of the reactor, the diameter of the filamentous catalyst is Φ0.3 to Φ1.5.
[0019] In this scheme, by limiting the diameter of the filamentous catalyst to the range of Φ0.3 to Φ1.5, an optimized balance between specific surface area and fluid resistance is achieved while ensuring the mechanical strength of the catalyst.
[0020] As a further improvement to the reactor, to further optimize the balance between specific surface area and fluid resistance, the diameter of the filamentous catalyst is Φ0.5~Φ1.0.
[0021] As a further embodiment of the reactor, adjacent reaction units are separated by reactor partitions, and the reactor partitions have connecting holes that connect the adjacent reaction units.
[0022] In this design, adjacent reaction units are separated by reactor partitions with interconnecting holes, creating a multi-stage, ordered reaction space within the reactor. Firstly, the partitions segment the reaction process, preventing interference between different reaction stages and ensuring the raw materials react fully in each unit, thus improving reaction stability and controllability. Secondly, the interconnecting holes ensure the raw materials flow sequentially between reaction units, achieving reaction continuity. Furthermore, the interconnecting holes also limit and rectify the flow of the reaction liquid, allowing it to enter the next reaction unit at a more uniform speed and state, guaranteeing relatively consistent reaction conditions within each unit and contributing to improved overall reaction efficiency and the quality of chlorine dioxide production.
[0023] As a further embodiment of the reactor, the distance between the reactor partition and the top of the hollow inner cavity is 40-80 mm.
[0024] In this scheme, by maintaining a distance of 40-80 mm between the reactor partition and the top of the hollow inner cavity, this distance range can ensure the effective residence time of the reaction liquid in each reaction unit, and avoid the excessive gas phase space caused by the partition being too high.
[0025] As a further embodiment of the reactor, the reaction unit includes a reactor inlet pipe, a catalyst wire fixing plate, and an aeration plate. One end of the reactor inlet pipe is connected to the top wall of the hollow inner cavity and extends outward from the reactor body. The other end of the reactor inlet pipe extends to the bottom of the hollow inner cavity and is sequentially connected to the catalyst wire fixing plate and the aeration plate. The filamentous catalyst is connected between the catalyst wire fixing plate and the aeration plate.
[0026] In this scheme, air is directly introduced into the bottom of the hollow inner cavity through the reactor air inlet pipe. It is then evenly dispersed into microbubbles by the aeration disc. During the ascent, the microbubbles form a gas-liquid-solid three-phase contact interface with the filamentous catalyst, which significantly improves the mass transfer efficiency. The integrated design of the catalyst filament fixing disc and the aeration disc not only provides stable vertical support for the filamentous catalyst, ensuring that it is orthogonally arrayed in the reaction liquid, but also causes the catalyst filament bundle to vibrate slightly through the gas disturbance effect of the aeration disc, effectively preventing scaling on the catalyst surface.
[0027] Compared with the prior art, this utility model has the following advantages and beneficial effects:
[0028] 1. This utility model, through the hollow inner cavity of the trapezoidal structure, increases the surface area of the reaction liquid by more than 50% compared with the traditional cylindrical / cubic structure, significantly accelerates the overflow of chlorine dioxide gas, controls the concentration of the reaction liquid below the safe threshold, and avoids the risk of decomposition;
[0029] 2. The multi-stage reaction unit of this utility model, combined with the orthogonal array arrangement of filamentous catalysts, increases the contact area and extends the contact time between the raw materials and the catalyst. At the same time, the integrated design of the reactor inlet pipe, reactor aeration disc and catalyst fixing disc reduces the scaling rate and improves the mass transfer efficiency through microbubble disturbance. Attached Figure Description
[0030] The accompanying drawings, which are included to provide a further understanding of the embodiments of the present invention and form part of this application, do not constitute a limitation thereof. In the drawings:
[0031] Figure 1 This is a front view of the present invention;
[0032] Figure 2 This is a top view of the present invention;
[0033] Figure 3 for Figure 2 A schematic diagram of the cross-sectional structure marked AA.
[0034] The attached diagram shows the markings and corresponding component names:
[0035] 1-Mixer; 2-Primary reactor; 3-Primary reactor inlet pipe; 4-Secondary reactor; 5-Secondary reactor inlet pipe; 6-Disinfectant outlet; 7-Primary reactor aeration disc; 8-Primary reactor catalyst wire; 9-Primary reactor catalyst wire fixing disc; 10-Secondary reactor aeration disc; 11-Secondary reactor catalyst wire; 12-Secondary reactor catalyst wire fixing disc; 13-Connecting hole; 14-Reactor partition. Detailed Implementation
[0036] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the embodiments and accompanying drawings. The illustrative embodiments and descriptions of this utility model are only used to explain this utility model and are not intended to limit this utility model.
[0037] Example 1
[0038] This embodiment 1 provides a reactor for a chlorine dioxide generator, such as... Figures 1-3 As shown, it includes the reactor body and the reaction unit.
[0039] Please refer to Figure 1 As shown, the reactor body can be made of titanium, PTFE, CPVC, or 2204 stainless steel, preferably titanium or CPVC. The reactor body includes a trapezoidal hollow cavity, and the ratio of the top area to the bottom area of the hollow cavity is 1:0.4 to 0.8. This ensures a significant increase in the surface area of the reaction liquid while avoiding instability of the reactor center of gravity or material waste caused by an excessively wide top. Preferably, to maximize the volatilization efficiency of chlorine dioxide gas, the ratio of the top area to the bottom area of the hollow cavity is 1:0.5 to 0.6.
[0040] Meanwhile, a mixer 1 and a disinfectant outlet 6 are connected to both ends of the hollow inner cavity. The mixer 1 is a static mixer or a dynamic mixer. The two raw materials are added from the front end of the mixer 1 and after being fully mixed in the mixer 1, they enter the reaction liquid area in the hollow inner cavity. Multiple reaction units are continuously set in the reaction liquid area. The reaction unit can be 1 to 4 stages, preferably 2 stages, that is, a first-stage reactor 2 and a second-stage reactor 4 are continuously set in the reaction liquid area.
[0041] Specifically, the primary reactor 2 includes a primary reactor inlet pipe 3, a primary reactor catalyst wire fixing plate 9, and a primary reactor aeration plate 7. One end of the primary reactor inlet pipe 3 is connected to the top wall of the hollow inner cavity and extends outward from the reactor body. The other end of the primary reactor inlet pipe 3 extends to the bottom of the hollow inner cavity and is connected to the primary reactor catalyst wire fixing plate 9 and the primary reactor aeration plate 7 in sequence. Primary reactor catalyst wires 8 are connected between the primary reactor catalyst wire fixing plate 9 and the primary reactor aeration plate 7. The primary reactor catalyst wires 8 are vertically arrayed and fixed between the two plates and are orthogonal to the raw material flow direction. The primary reactor catalyst wires 8 maintain a distance of 20-30 mm from the bottom and sides of the reactor body, forming a three-dimensional catalytic network. This ensures that the raw material must penetrate the catalyst wire bundle multiple times during the flow process, significantly increasing the contact path and time between the reaction liquid and the catalyst.
[0042] Similarly, the secondary reactor 4 also includes a secondary reactor inlet pipe 5, a secondary reactor catalyst wire fixing plate 12, and a secondary reactor aeration plate 10. One end of the secondary reactor inlet pipe 5 is connected to the top wall of the hollow inner cavity and extends outward to the outside of the reactor body. The other end of the secondary reactor inlet pipe 5 extends to the bottom of the hollow inner cavity and is connected to the secondary reactor catalyst wire fixing plate 12 and the secondary reactor aeration plate 10 in sequence. The secondary reactor catalyst wires 11 are connected between the secondary reactor catalyst wire fixing plate 12 and the secondary reactor aeration plate 10. The secondary reactor catalyst wires 11 are vertically arrayed and fixed between the two plates and are orthogonal to the direction of raw material flow. The secondary reactor catalyst wires 11 maintain a distance of 20-30 mm from the bottom and the sides of the reactor body to form a three-dimensional catalytic network. This ensures that the raw material must penetrate the catalyst wire bundle multiple times during the flow process, which significantly increases the contact path and time between the reaction liquid and the catalyst.
[0043] Working process: Two raw materials are added from the front end of mixer 1. After being fully mixed in mixer 1, they enter the primary reactor 2. The reaction liquid fully contacts and reacts with the primary reactor catalyst wire in the primary reactor 2. After reacting, it enters the secondary reactor 4 and fully contacts and reacts with the secondary reactor catalyst wire 11 in the secondary reactor. After reacting, it is drawn out from the disinfectant outlet pipe 6 at the top of the secondary reactor 4. At the same time as the reaction liquid enters the reactor from the mixer, air is automatically introduced from the primary reactor air inlet pipe 3 and the secondary reactor air inlet pipe 5. The air is evenly distributed into the primary and secondary reaction liquids through the primary reactor aeration plate 7 and the secondary reactor aeration plate 10. The chlorine dioxide in the reaction liquid is blown out into the gas phase space of the reactor and is drawn out from the disinfectant 6.
[0044] Example 2
[0045] This embodiment 2 provides a reactor for a chlorine dioxide generator based on embodiment 1, such as... Figures 1-3As shown, the above-mentioned reaction unit includes four reactors, and each reactor is separated by a reactor partition 14. The reactor partition 14 has a connecting hole 13 that connects the first-stage reactor 2 and the second-stage reactor 4, so that a multi-stage orderly reaction space is formed in the reactor, thereby dividing the reaction process into stages, avoiding mutual interference between different reaction stages, allowing the raw materials to react fully in each reactor, and improving the stability and controllability of the reaction.
[0046] In some embodiments, in order to further ensure the effective residence time of the reaction liquid in each stage reactor, the distance between the upper edge of the reactor partition 14 and the top of the hollow inner cavity is 40-80 mm.
[0047] In some embodiments, in order to further ensure the mechanical strength of the catalyst while achieving an optimized balance between specific surface area and fluid resistance, the diameter of the filamentous catalyst is Φ0.3 to Φ1.5, preferably Φ0.5 to Φ1.0.
[0048] Working process: Two raw materials are added from the front end of the dynamic mixer. After being fully mixed in mixer 1, they enter the primary reactor 2. The reaction liquid reacts fully with the catalyst in the primary reactor 2 and then enters the secondary reactor 4 through the connecting hole 13 at the bottom of the primary reactor 2. After reacting fully with the catalyst in the secondary reactor, it enters the tertiary reactor from the top of the secondary reactor. After reacting in the tertiary reactor, it enters the quaternary reactor from the bottom. The reaction liquid after reacting in the quaternary reactor is drawn out from the disinfectant outlet pipe 6. At the same time as the reaction liquid enters the reactor from the mixer, air is automatically introduced from the aeration pipes of each reactor and evenly distributed to the reaction liquid in each stage through the aeration discs of each stage. The chlorine dioxide in the reaction liquid is blown out into the gas phase space of the reactor and drawn out from the disinfectant 6.
[0049] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of this utility model. It should be understood that the above description is only a specific embodiment of this utility model and is not intended to limit the scope of protection of this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the scope of protection of this utility model.
Claims
1. A reactor for a chlorine dioxide generator, characterized by, include: The reactor body includes a trapezoidal hollow cavity, wherein the top area of the hollow cavity is larger than the bottom area of the hollow cavity. The reaction unit is provided in multiple sets at the bottom reaction liquid area of the hollow inner cavity, and the adjacent reaction units are connected so that the raw materials entering the reaction liquid area can flow from the reaction unit in sequence.
2. A reactor for a chlorine dioxide generator according to claim 1, characterized in that The ratio of the top area of the hollow inner cavity to the bottom area of the hollow inner cavity is 1:0.4 to 0.
8.
3. A reactor for a chlorine dioxide generator according to claim 2, wherein The ratio of the top area of the hollow inner cavity to the bottom area of the hollow inner cavity is 1:0.5 to 0.
6.
4. A reactor for a chlorine dioxide generator according to claim 1, characterized in that, Each reaction unit includes a filamentous catalyst, which is arranged in an array perpendicular to the direction of feed flow.
5. A reactor for a chlorine dioxide generator according to claim 4, wherein The filamentous catalyst is 20-30 mm away from the bottom and the sides.
6. A reactor for a chlorine dioxide generator according to claim 4, wherein The diameter of the filamentous catalyst is Φ0.3~Φ1.
5.
7. A reactor for a chlorine dioxide generator according to claim 6, wherein The diameter of the filamentous catalyst is Φ0.5~Φ1.
0.
8. A reactor for a chlorine dioxide generator according to claim 4, characterized in that, The adjacent reaction units are separated by a reactor partition (14), and the reactor partition (14) has a connecting hole (13) that connects the adjacent reaction units.
9. A reactor for a chlorine dioxide generator according to claim 8, characterized in that The distance between the reactor partition (14) and the top of the hollow inner cavity is 40-80 mm.
10. A reactor for a chlorine dioxide generator according to claim 8, characterized in that The reaction unit includes a reactor inlet pipe, a catalyst wire fixing plate, and an aeration plate. One end of the reactor inlet pipe is connected to the top wall of the hollow inner cavity and extends outward from the reactor body. The other end of the reactor inlet pipe extends to the bottom of the hollow inner cavity and is connected to the catalyst wire fixing plate and the aeration plate in sequence. The filamentous catalyst is connected between the catalyst wire fixing plate and the aeration plate.