Embedded chlorine dioxide generator

Abstract

This utility model discloses an embedded chlorine dioxide generator, comprising a static mixer cavity and a generator cavity, both with adjacent end shells sequentially sealed and connected, and internal cavities interconnected. A jet pump for further connecting the static mixer cavity and the generator cavity is fixedly installed at the top of both cavities. Part of the wastewater inside the generator cavity can be returned to the static mixer cavity via the jet pump. A chlorine dioxide reactor is fixedly installed inside the generator cavity. The chlorine dioxide reactor includes a slender, annular chlorine dioxide reaction chamber. The inner and outer surfaces of the chlorine dioxide reaction chamber are completely immersed in the wastewater inside the generator cavity. The chlorine dioxide generated in the chlorine dioxide reaction chamber is directly input into the static mixer cavity, where it is thoroughly mixed with the wastewater entering the static mixer cavity.

Description

Technical Field

[0001] This utility model relates to an embedded chlorine dioxide generator, which is suitable for oxidizing and removing reducing substances such as sulfides from wastewater. Background Technology

[0002] Chlorine dioxide is typically produced by the chemical reaction of sodium chlorate or sodium chlorite with concentrated hydrochloric acid. Existing chlorine dioxide generators typically have chemical reaction tanks separate from the main sewage pipeline. The generated chlorine dioxide is then pumped into the main sewage pipeline, posing a risk of explosion or spillage. Even with safety measures such as explosion-proof devices, organized venting, and sodium hydroxide absorption equipment, the risk remains. Furthermore, the need for external circulating water to regulate the temperature of the reaction tank results in a bulky and costly system. Summary of the Invention

[0003] The purpose of this utility model is to provide an embedded chlorine dioxide generator, which is installed in series on the main sewage pipeline and integrates functions such as reaction liquid preheating, rapid mixing and reaction of reaction liquid, high-efficiency heat exchange, and rapid mixing of chlorine dioxide and sewage.

[0004] The embedded chlorine dioxide generator of this utility model is directly installed on the main sewage pipeline. It includes a static mixer chamber and a generator chamber with adjacent end shells sequentially sealed and connected, and internal cavities connected. Sewage enters from the other end of the static mixer chamber, flows sequentially through the static mixer chamber and the generator chamber, and then exits from the other end of the generator chamber. A jet pump for further connecting the static mixer chamber and the generator chamber is fixedly installed on the top of the static mixer chamber and the generator chamber. Some sewage inside the generator chamber can be returned to the static mixer chamber through the jet pump. A chlorine dioxide reactor is fixedly installed inside the generator cavity. The chlorine dioxide reactor includes a slender chlorine dioxide reaction chamber with a circular cross-section. The inner and outer surfaces of the chlorine dioxide reaction chamber are completely immersed in the sewage inside the generator cavity. The chlorine dioxide generated in the chlorine dioxide reaction chamber is directly input into the static mixer cavity to fully mix with the sewage entering the static mixer cavity.

[0005] Preferably, the chlorine dioxide reactor includes a feed mixer, a reaction tube bundle, a discharge guide pipe, and an external cavity fluid-blocking support structure; The reaction tube bundle includes multiple parallel reaction tubes, each of which includes a sleeve and a central tube. The chlorine dioxide reaction chamber is formed between the sleeve and the central tube. The multiple reaction tubes are connected in series at their ends via connecting pipes to form a long, meandering chlorine dioxide reaction chamber. One end of the chlorine dioxide reaction chamber is connected to the feed mixer extending outside the generator chamber, and the other end is connected to the discharge guide pipe extending into the static mixer chamber. All the reaction tubes are fixedly installed in the generator cavity after being arranged in parallel by the external cavity fluid-blocking support structure.

[0006] Preferably, the central pipe is a slender steel pipe with open ends, and an outer pipe section with the same diameter as the sleeve is formed at the sewage inlet end.

[0007] Preferably, the outer surface of the slender steel pipe from the outer pipe section to the sewage outlet end of the central pipe is integrally formed with multiple cylindrical protrusions.

[0008] Preferably, the sleeve is a slender steel pipe with a large open section at one end that is sealed and connected to the outer pipe section of the central pipe, and a closed end at the other end. The closed end has a through hole for the water outlet of the central pipe to pass through, and the closed end is sealed and connected to the outer wall of the water outlet of the central pipe.

[0009] Preferably, the sleeve has a cylindrical groove near the large open section for embedding a temperature sensor.

[0010] Preferably, the diameter of the sleeve is 2-3 times the diameter of the central tube.

[0011] Preferably, the feed mixer includes a feed chamber, a heating device, and two parallel feed pipes.

[0012] The embedded chlorine dioxide generator of this invention integrates three major functions: chlorine dioxide generation, chlorine dioxide addition and mixing, and heat exchange in the reaction system. Since the generation and addition of chlorine dioxide are both completed within a space surrounded by wastewater, and the chemical reaction system is entirely placed in a wastewater bath, the newly generated chlorine dioxide mixes immediately with the wastewater, eliminating the risk of chlorine dioxide explosion or spillage at the source. This achieves inherent safety in the chlorine dioxide generation and addition process, while utilizing heat exchange between the wastewater and the reaction system ensures stability and reliability. Attached Figure Description

[0013] Figure 1 This is a three-dimensional schematic diagram of the chlorine dioxide generator in this utility model.

[0014] Figure 2 This is a top view of the chlorine dioxide generator in this utility model.

[0015] Figure 3 This is a side view of the chlorine dioxide generator in this utility model.

[0016] Figure 4 yes Figure 3A schematic diagram of the longitudinal section along line AA.

[0017] Figure 5 yes Figure 3 A schematic diagram of the transverse cross-sectional structure along the BB line.

[0018] Figure 6 This is a schematic diagram illustrating the working principle of the chlorine dioxide generator in this utility model.

[0019] Figure 7 This is a three-dimensional structural diagram of the reactor in this utility model.

[0020] Figure 8 This is a front view schematic diagram of the reactor in this utility model.

[0021] Figure 9 This is a side view of the reactor structure in this utility model.

[0022] Figure 10 This is a schematic diagram of the reaction tube in this utility model.

[0023] Figure 11 yes Figure 10 A cross-sectional view of the intermediate reaction tube along the CC line.

[0024] Figure 12 This is a three-dimensional structural diagram of the central tube in this utility model.

[0025] Figure 13 This is a schematic diagram of the cross-sectional structure of the central tube in this utility model.

[0026] Figure 14 This is a three-dimensional structural diagram of the sleeve in this utility model.

[0027] Figure 15 This is a schematic diagram of the cross-sectional structure of the sleeve in this utility model.

[0028] Figure 16 yes Figure 11 Enlarged diagram of point D in the middle. Detailed Implementation

[0029] The specific embodiments of this utility model will now be described in detail with reference to the accompanying drawings.

[0030] like Figure 1 , Figure 2 and Figure 3As shown, the chlorine dioxide generator of this invention includes a static mixer chamber 1 and a generator chamber 2, which are sequentially sealed together with their outer shells and connected internally. Specifically, the two adjacent ends of the static mixer chamber 1 and the generator chamber 2 are sealed together. An inlet 10 is provided at the other end of the static mixer chamber 1, and an outlet 20 is provided on the side wall of the generator chamber 2 near the other end. The inlet 10 and outlet 20 connect to the main sewage pipeline; that is, sewage from the main pipeline enters through the inlet 10, flows through the static mixer chamber 1 and the generator chamber 2, and is then output through the outlet 20. A reactor 21 is provided inside the generator chamber 2, where a first and second reagent react to generate chlorine dioxide. Typically, sodium chlorate or sodium chlorite reacts with concentrated hydrochloric acid according to the following reaction formula.

[0031] 2NaClO3 + 4HCl (conc.) = 2NaCl + Cl2↑ + 2ClO2↑ + 2H2O 5NaClO2 + 4HCl = 4ClO2 + 5NaCl + 2H2O A jet pump 3 is installed at the top of the generator chamber 2 and the static mixer chamber 1, which can backflow the wastewater inside the generator chamber 2 into the static mixer chamber 1 for further mixing. Figure 4 As shown, an internal jet injector 14 is installed inside the static mixer chamber 1 to quickly and evenly mix the chlorine dioxide generated inside the reactor 21 into the wastewater entering the static mixer chamber 1.

[0032] like Figure 4 , Figure 5 and Figure 6 As shown, the reactor 21, which is fixedly installed inside the generator cavity 2, includes a feed mixer 210, a reaction tube bundle 211, a discharge guide pipe 212, and an external cavity fluid-blocking support structure 213 (hereinafter referred to as the support structure). The reactor 21 is made of stainless steel that is resistant to corrosion by concentrated hydrochloric acid and chlorine dioxide to obtain the same heat transfer coefficient. The sealing material is polytetrafluoroethylene. The specific structure and working principle are as follows.

[0033] like Figure 7 and Figure 9 As shown, the reaction tube bundle 211 includes multiple parallel reaction tubes 214. This embodiment takes seven parallel reaction tubes 214 that are distributed and arranged at equal intervals as an example, but it is not limited to this.

[0034] like Figure 10 and Figure 11As shown, each reaction tube 214 includes a central tube 215 and a sleeve 216. The central tube 215 is inserted into the sleeve 216 from one end. Both ends of the sleeve 216 are sealed to the central tube 215, forming a closed annular channel 217 between the sleeve 216 and the central tube 215. Each end of the annular channel 217 is provided with a connecting tube 218 for series connection.

[0035] like Figure 12 and Figure 13 As shown, the central pipe 215 is a slender steel pipe, with one end being a sewage inlet 219 and the other end being a sewage outlet 222. The sewage inlet 219 has an outer pipe section 220 integrally formed outside the slender steel pipe, closed at one end and open at the other. Preferably, as shown... Figure 12 As shown, the outer pipe end 220 is directly expanded outward through the slender tube body of the central pipe 215, forming a funnel shape at the expanded end, which can enhance the water flow velocity of the central pipe 215. After the expansion is formed, the inner and outer diameters of the outer pipe section 220 are the same as the inner and outer diameters of the sleeve 216.

[0036] like Figure 14 and Figure 15 As shown, the sleeve 216 is a slender steel pipe with a diameter 2-3 times that of the central pipe 215. One end has a large open section 224 that seals and abuts against the outer pipe section 220 of the central pipe 215, and the other end is a closed end 227. The closed end 227 has a through hole 225 for the outlet end 222 of the central pipe 215 to pass through. A groove 226 for a sealing ring is provided on the wall of the through hole 225. The outlet end 222 of the central pipe 215 enters through the large open section 224 of the sleeve 216 and extends out of the closed end of the sleeve 216, and is sealed and connected via the sealing groove 226 and the sealing ring 224. Figure 16 As shown. Simultaneously, after the central tube 215 is inserted into the sleeve 216, the open end of the outer tube 220 seals against the large open section 224 of the sleeve 216 (e.g., using a sealing ring, clamp, and bolts for fixing), thereby forming an annular channel 217 between the sleeve 216 and the central tube 215. A cylindrical groove 228 is integrally formed on the outer wall surface of the sleeve 216 near the large open section 224 for fixing the temperature sensor.

[0037] like Figure 11 , Figure 12 and Figure 13 As shown, the outer surface of the slender steel pipe from the outer pipe section 220 to the outlet end 219 of the central pipe 215 is integrally formed with multiple cylindrical protrusions 221. These protrusions not only serve as flow barriers for the liquid medicine in the annular channel 217 inside the reaction pipe 214, but also as a supporting structure for the central pipe 215. The blockage ratio of the protrusions 221, which act as flow barriers, to the reaction pipe 214 is controlled at 0.2~0.35, and the liquid medicine forms a Karman vortex street fluid in the annular channel 217 of the reaction pipe 214.

[0038] like Figure 7 , Figure 8 and Figure 9 As shown, the support structure 213 is integrally formed from a metal sheet, in the shape of a disc, with a diameter slightly smaller than the cross-sectional diameter of the reactor cavity 2. It includes a support portion 230 that can be fixedly connected to the inner wall of the reactor cavity 2. Seven through holes 231 are evenly arranged within the support portion for the reaction pipe 214 to pass through. Multiple irregularly shaped holes 232 are formed between the through holes 231 to allow wastewater to flow freely within the reactor cavity 2. This support structure 213 also serves as a fluid-blocking structure on the outer wall of the reactor 21, a reaction pipe support frame designed according to fluid-blocking technology. The support portion 230 matches the inner diameter of the generator cavity 2. After the reactor 21 is fixed within the generator cavity 2, wastewater flowing from the static mixer cavity 1 into the generator cavity 2 forms a vortex when passing through the support structure 213, which facilitates the mixing of the reagent input from the generator 21 with the wastewater and also facilitates heat exchange between the wastewater and the reaction pipe 214.

[0039] Seven reaction tubes 214 pass through two parallel support structures 213. The parallel-assembled reaction tubes 214 are connected end-to-end by connecting pipes 218, sequentially connecting the annular channel 217. Finally, they are fixed to the inner wall of the reactor chamber 2 via the support structures 213, ensuring the reaction tubes 214 are completely submerged in wastewater. This not only fixes the reaction tube bundle 211 but also serves as a flow-blocking structure within the reactor chamber 2. The outer pipe ends 220 of the central pipe 215 all face the direction of the static mixer chamber 1. The flared outer pipe ends 220 allow wastewater to flow rapidly into the central pipe 215, filling its slender tube with wastewater. This completely covers the chemical solution within the annular channel 217 of the reaction tubes 214. The wastewater flowing in the central pipe 215 and the wastewater flowing in the generator chamber 2 simultaneously exchange heat with the chemical solution in the reactor 21, allowing the chemical solution to react in a very safe environment.

[0040] like Figure 4 and Figure 5 As shown, the feed mixer 210 is fixedly installed on the side wall of the reactor cavity 2 and extends into the reactor cavity 2. It includes a feed chamber 240, a heating device 22, and two feed ports 241. The two feed ports 241 are connected to the annular channel 217 via feed pipes 242, and the two feed ports 241 are respectively connected to the storage devices of the first reagent (agent A) and the second reagent (agent B). The heating device 22 is used to indirectly heat the first reagent and the second reagent respectively. The heating device 22 can be an electric heater or a water bath heater, and a temperature sensor is installed at the liquid outlet. The heating device 22 has a heat output regulation function and a self-limiting temperature function. The temperature regulation range is from room temperature to 60°C, and the upper limit of the heating temperature is 60°C.

[0041] like Figure 4 and Figure 6 As shown, the discharge guide pipe 212 of the reactor 21 is installed parallel to the reaction pipe 214. It is directly installed at the end of the reaction pipe 214, which is furthest from the feed mixer 210, and extends into the interior of the static mixer, communicating with the inner jet device 14. With the help of the inner jet device 14, which acts as a flow obstruction, the outlet end of the liquid is located at the sewage inlet end of the entire chlorine dioxide generator. The newly generated chlorine dioxide is mixed with the sewage through the outlet of the discharge guide pipe 212, and is fully mixed in the static mixer cavity 1.

[0042] like Figure 6 As shown, the mixing equipment in this invention is equipped with a controller and an automatic control program. Specifically, it includes a first metering pump for controlling the first and second reagents, and a second metering pump for controlling the wastewater volume. The flow rate can be proportionally adjusted using the second and first metering pumps. Multiple temperature sensors 23, connected to the inside of the generator chamber 2, are located at the top of the generator chamber 2 to monitor the reaction temperature during chlorine dioxide generation at different stages of the reactor 21's path (position). Specifically, three temperature sensors are evenly spaced on the reaction tube 214, and a temperature sensor is also installed on the feed mixer 210. During normal operation, the average temperature of the three temperature sensors on the reaction tube 214 forms a regulating loop with the heater's output function, thereby controlling the reaction temperature. This allows for temperature adjustment and control according to different stages, ensuring a more complete and efficient chlorine dioxide reaction. When the wastewater temperature is higher than the feed temperature but lower than the set reaction temperature, the reaction tubes at the front of reactor 21 obtain heat from the wastewater to start the reaction. As the reaction temperature rises in the rear section, the wastewater cools the reaction tubes. The temperature peak occurs in the middle section, and the chlorine dioxide yield distribution is wider in each section of reaction tube 214. When the wastewater temperature is lower, the feed is heated to the reaction start temperature by the heating device 22, and the wastewater cools the reaction tubes. The temperature peak occurs in the front section of reaction tubes, and the chlorine dioxide conversion rate is relatively more distributed in the front section of reaction tubes.

[0043] In summary, this invention integrates three major functions: chlorine dioxide generation, chlorine dioxide addition and mixing, and heat exchange in the reaction system. Since both the generation and addition of chlorine dioxide are completed within a space surrounded by wastewater, the chemical reaction system is essentially placed in a wastewater bath. The newly generated chlorine dioxide mixes immediately with the wastewater, eliminating the risk of chlorine dioxide explosion or spillage at the source and achieving inherent safety in the chlorine dioxide generation and addition process. Simultaneously, the heat exchange between the wastewater and the reaction system ensures stability and reliability.

Claims

1. An embedded chlorine dioxide generator, directly installed on a main sewage pipeline, comprising a static mixer chamber and a generator chamber with adjacent end shells sequentially sealed and connected, and internal cavities interconnected. Sewage enters from the other end of the static mixer chamber, flows sequentially through the static mixer chamber and the generator chamber, and exits from the other end of the generator chamber, characterized in that... A jet pump for further connecting the static mixer cavity and the generator cavity is fixedly installed on the top of the static mixer cavity and the generator cavity, and some of the sewage inside the generator cavity can be returned to the static mixer cavity through the jet pump. A chlorine dioxide reactor is fixedly installed inside the generator cavity. The chlorine dioxide reactor includes a slender chlorine dioxide reaction chamber with a circular cross-section. The inner and outer surfaces of the chlorine dioxide reaction chamber are completely immersed in the sewage inside the generator cavity. The chlorine dioxide generated in the chlorine dioxide reaction chamber is directly input into the static mixer cavity to fully mix with the sewage entering the static mixer cavity.

2. The embedded chlorine dioxide generator according to claim 1, characterized in that, The chlorine dioxide reactor includes a feed mixer, a reaction tube bundle, a discharge guide pipe, and an external cavity fluid-blocking support structure. The reaction tube bundle includes multiple parallel reaction tubes, each of which includes a sleeve and a central tube. The chlorine dioxide reaction chamber is formed between the sleeve and the central tube. The multiple reaction tubes are connected in series at their ends via connecting pipes to form a long, meandering chlorine dioxide reaction chamber. One end of the chlorine dioxide reaction chamber is connected to the feed mixer extending outside the generator chamber, and the other end is connected to the discharge guide pipe extending into the static mixer chamber. All the reaction tubes are fixedly installed in the generator cavity after being arranged in parallel by the external cavity fluid-blocking support structure.

3. The embedded chlorine dioxide generator according to claim 2, characterized in that, The central pipe is a slender steel pipe with open ends, and an outer pipe section with the same diameter as the sleeve is expanded outward at the sewage inlet end.

4. The embedded chlorine dioxide generator according to claim 3, characterized in that, The central pipe has multiple cylindrical protrusions integrally formed on the outer surface of the slender steel pipe from the outer pipe section to the sewage outlet.

5. The embedded chlorine dioxide generator according to claim 3, characterized in that, The sleeve is a slender steel pipe with a large open section at one end that is sealed and connected to the outer pipe section of the central pipe, and a closed end at the other end. The closed end has a through hole for the water outlet of the central pipe to pass through, and the closed end is sealed and connected to the outer wall of the water outlet of the central pipe.

6. The embedded chlorine dioxide generator according to claim 5, characterized in that, The sleeve has a cylindrical groove near the large open section for embedding a temperature sensor.

7. The embedded chlorine dioxide generator according to claim 4, characterized in that, The diameter of the sleeve is 2-3 times the diameter of the central tube.

8. The embedded chlorine dioxide generator according to claim 2, characterized in that, The feed mixer includes a feed chamber, a heating device, and two parallel feed pipes.

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