Ozone contact tank structure that can reduce post-reaction ozone concentration and optimize hydraulic efficiency

Abstract

This invention proposes an ozone contact tank structure that reduces post-reaction ozone concentration and optimizes hydraulic efficiency. A settling chamber is added after the ozone contact tank; each contact chamber is modified to have a progressively decreasing ozone emitter; a guide plate is located at the inlet of the reaction chamber, and a micro-powered turbine rotor is located within the reaction chamber. The settling chamber is connected to the final stage of the reaction chamber, with an exhaust vent at its top for tail gas discharge, allowing water to exit from the bottom of the tank. Each reaction chamber inlet has a guide baffle, which is an angled columnar structure. The contact tank is a three-stage reaction contact tank, with a progressively decreasing number of emitters in each tank. The contact tank design is simple, reduces ozone usage, requires no major modifications to the original tank structure, effectively reduces post-reaction ozone concentration, improves tail gas post-treatment efficiency, promotes full reaction between water and ozone, and improves the hydraulic performance of the tank.

Description

Technical Field

[0001] This invention relates to the field of ozone contact tanks, and more specifically to an ozone contact tank structure that can reduce the ozone concentration after the reaction and optimize hydraulic efficiency. Background Technology

[0002] Numerous examples demonstrate that traditional conventional water treatment processes in waterworks are inadequate to adapt to changes in existing water sources and meet increasingly stringent water quality standards. To effectively remove organic matter from raw water, especially newly emerging micro-polluting organic matter, it is necessary to develop new combined processes and advanced treatment technologies for drinking water. The most widely used advanced treatment technology is ozone-activated carbon technology.

[0003] The mass transfer efficiency of ozone in an ozone contact tank is affected by the ozone diffusion system and the tank structure. Current optimization efforts for ozone contact tanks primarily focus on improving ozone utilization efficiency, especially the ozone diffusion system and the tank's structural design. Optimizing the tank structure enhances its hydraulic efficiency and reduces backflow, short-circuiting, and stagnant flow.

[0004] Compared to fluorine, ozone is less soluble in water. Therefore, to ensure more thorough mixing of ozone and water, the ozone dosage must be increased, resulting in a certain amount of unreacted ozone in the exhaust gas. Common methods for treating ozone exhaust gas include activated carbon adsorption decomposition, thermal decomposition, and fused media decomposition. However, these methods suffer from several drawbacks. First, the exhaust gas contains not only ozone but also other impurities, leading to low treatment efficiency and complex processes. Second, recovering unreacted ozone through ozone recovery devices is costly and difficult to operate, and the exhaust gas cannot be directly emitted. This increases both ozone usage and water purification costs, resulting in low economic benefits. Summary of the Invention

[0005] To address the existing problems, the first objective of this invention is to reduce the concentration of ozone entering the next treatment unit by improving the structure of the ozone contact tank and controlling the amount of ozone added, thereby reducing the concentration of ozone after the reaction, improving the tail gas treatment efficiency, and reducing the pressure on the next treatment unit.

[0006] To achieve the first objective, this invention proposes a novel structure for an ozone contact tank and a novel arrangement of ozone emitters. The ozone contact tank in this invention adopts a three-section structure arranged sequentially from front to back. An inlet is located at the front of the ozone contact tank, and a settling chamber is located at the rear. The settling chamber, located after the third reaction chamber, is an independent chamber with a tail gas emission device at its top and its lower end directly connected to the outlet of the ozone contact tank, allowing the water to directly enter the next treatment stage. A different number of ozone emitters are installed in each contact chamber of the ozone contact tank, with the first reaction chamber containing the most emitters, and the number decreasing sequentially thereafter.

[0007] As an optimization, the height and width of the settling chamber are the same as those of the contact chamber and reaction chamber, and the length is calculated using a formula based on the different hydraulic retention times. The formula for calculating the length of the settling chamber is: Where V is the volume of the settling chamber (m³) 3 ); t is the hydraulic residence time (min), (refer to the "Water Supply and Drainage Design Manual" if no experimental materials are available); Q 水 Water flow rate (m) 3 / h).

[0008] As an optimization, the number of emitters in each contact chamber can be assumed to be n for the third contact chamber, 2n for the second contact chamber, and 0 for the first contact chamber.

[0009] The second objective of this invention is to optimize the structure of the ozone contact tank, improve its hydraulic efficiency, increase the mixing degree of water and ozone, and reduce backflow, short-circuiting and stagnation to increase the water purification efficiency of the ozone contact tank.

[0010] To achieve the second objective mentioned above, the present invention adopts the following technical solution. The ozone contact tank employs a three-section structure arranged sequentially from front to back, with each section including contact chambers and reaction chambers positioned at opposite ends. Each contact chamber is equipped with an ozone emitter, and each reaction chamber has a flow guide baffle at its inlet. Each reaction chamber contains a micro-powered turbine rotor. The lower parts of the contact chambers and reaction chambers in each section are connected, while the upper parts of the reaction chambers and contact chambers in adjacent sections are connected. Baffles separate the contact chambers and reaction chambers. After one stage of reaction is completed, water continues to enter the contact chamber for the next stage of reaction. When water enters the reaction chamber after contacting ozone in the contact chamber, a flow guide baffle separates the water. A portion of the water, under the influence of the flow guide baffle and hydraulic force, impacts the turbulent micro-powered turbine rotor in the reaction chamber, causing it to rotate and thus ensuring thorough mixing and reaction of the water and ozone.

[0011] As an optimization, the baffle plate is a columnar structure with a certain angle, with both ends directly connected to the wall of the ozone contact tank. The included angle between the two plates is 105 degrees to allow more water to pass through. The vertical baffle is 180mm long and 80mm wide, and the inclined baffle is 200mm long and 80mm wide. It is an integral structure with the tank body and can be designed and constructed together with the tank body.

[0012] As an optimization, the micro-powered turbine rotors in each reaction chamber are composed of multiple small micro-powered turbine rotors connected in series on a rigid straight column, and the two ends of the rigid straight column are fixed to the wall of the ozone contact pool; the turbulence micro-powered turbine rotors in the reaction chamber are composed of 16 identical small micro-powered turbine rotors, made of high-density polyethylene, each small micro-powered turbine rotor consists of four blades, the blade thickness is 2mm, the blade length is 280mm, and the blade width is 128mm.

[0013] As an optimization, this invention uses Ansys Fluent software to simulate the state of water after passing through the baffle, ensuring that the turbulence-induced micro-powered turbine rotor in each reaction chamber is in the optimal position, as shown in the following figure. Figure 1 As shown.

[0014] Compared with the prior art, the present invention has the following advantages.

[0015] 1. Compared with other products, this invention uses a lower amount of ozone, does not require adjustment of the percentage of ozone gas added, reduces ozone loss and the concentration of ozone after the reaction, lowers the cost of exhaust gas treatment, is simple to design, reduces the amount of ozone used, does not require major modifications to the original tank, and has certain economic benefits.

[0016] 2. Compared to the reaction chamber of a traditional ozone contact tank, this invention adds a turbulent micro-powered turbine rotor and a guide plate to the reaction chamber. The position of the turbulent micro-powered turbine rotor was determined by flow field simulation using Ansys Fluent software. The actual position of the turbulent micro-powered turbine rotor was determined based on the actual flow field distribution in different reaction chambers, ensuring that the turbulent micro-powered turbine rotor in each reaction chamber is in the optimal position. The flow field in the reaction chamber is more uniform, reducing short-circuiting, stagnant flow, and dead water zones in the ozone contact tank. Attached Figure Description

[0017] Figure 1 This is a cross-sectional view of the ozone contact tank.

[0018] Figure 2 The image shows the simulation results from the ANSYS Fluent software.

[0019] Figure 3 This is the style of a micro-powered turbine rotor. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0021] The ozone contact tank of the present invention has a three-section structure, and each contact chamber and reaction chamber has the same size and structure.

[0022] The labels in the attached diagram are as follows: 1. Inlet, connected to the first contact chamber; 2. Ozone contact tank wall; 3. Upper partition of the ozone contact tank, used to separate the contact chamber and the reaction chamber; 4. First contact chamber, with the highest ozone content; 5. Ozone release device; 6. Turbulence column, located in the reaction chamber, to ensure thorough mixing of ozone and water, promoting reaction efficiency; 7. First reaction chamber; 8. Second contact chamber, with a relatively lower amount of ozone than the first section; 9. Second reaction chamber, equipped with the same turbulence column as the first reaction chamber; 10. Third contact chamber, with a lower ozone content than the second section; 11. Third reaction chamber, equipped with the same turbulence column as the first and second reaction chambers; 12. Ozone contact tank settling chamber, connected to the outlet, with a tail gas discharge port at the top; 13. Outlet, connected to the next treatment unit; 14. Tail gas discharge port, located at the top of the settling chamber; 15. Liquid level; 16. Lower partition of the ozone contact tank, separating the reaction chamber from the next contact chamber.

[0023] The specific requirements for construction shall be determined according to actual construction needs, and no specific restrictions shall be imposed in this application.

[0024] Example 1: A structure for effectively reducing ozone content after a reaction, comprising a settling chamber and a number of releasers of varying sizes.

[0025] The settling chamber is located at the very end of the three-stage ozone contact tank. Its inlet is connected to the inlet of the final reaction chamber, separated by a partition. A tail gas emission device is located at the top of the settling chamber, and the outlet of the settling chamber is also the outlet of the ozone contact tank. After the water has settled sufficiently in the settling chamber, tail gases such as ozone and oxygen produced during the reaction are discharged. The water retention time is generally more than ten minutes, reducing the concentration of ozone retained in the water in the next treatment unit. The varying numbers of ozone emitters are standard ozone contact tank emitters, with no special requirements; only the number of emitters in different contact tanks needs to be changed. The first contact chamber has the most emitters, the third contact tank has the fewest, and the number of emitters decreases sequentially. Assuming the third-stage reaction involves spraying n particles, then the second contact chamber has 2n emitters, and the first contact chamber has 3n emitters. This design avoids the need to control the percentage of ozone intake at different contact points, which reduces the amount of ozone added to a certain extent, lowers the concentration of ozone after the reaction, and saves economic costs.

[0026] As a further improvement, the hydraulic residence time of the settling chamber can be determined using the following method: the height and width are the same as those of the contact chamber and reaction chamber, and the length is calculated using a formula based on the different hydraulic residence times. The formula for calculating the length of the settling chamber is: Where V is the volume of the settling chamber (m³) 3 ); t is the hydraulic residence time (min), (refer to the "Water Supply and Drainage Design Manual" if no experimental materials are available); Q 水 Water flow rate (m) 3 / h).

[0027] Example 2, a structure for optimizing hydraulic efficiency, includes a guide vane and a turbulence-driven micro-power turbine rotor.

[0028] The guide vanes, identical to those in the ozone contact tank, are constructed using the same materials. The bottom of the vane is 180mm from the bottom of the contact tank, and the left side of the guide vane is 300mm from the right side of the partition between the contact chamber and the reaction chamber. The vertical guide vane is 80mm wide and 180mm high; the inclined guide vane is 80mm wide and 200mm high, forming a 105-degree angle with the vertical guide vane. This design allows for a relatively larger volume of water entering the reaction chamber, resulting in more water rotating on the turbulent micro-powered turbine rotor. The turbulent micro-powered turbine rotor consists of 16 small micro-powered turbine rotors connected in series on a rigid straight column. The rigid column has a diameter of [diameter missing] mm and is fixed at both ends to the walls at both ends of the ozone contact tank. The positions of the turbine rotors, determined by the location of the guide vanes, were simulated using Ansys Fluent software. The actual positions of the turbine rotors were determined based on the actual flow field distribution in different reaction chambers, ensuring that the turbine rotors in each reaction chamber are in optimal positions, resulting in a more uniform flow field within the reaction chamber.

[0029] As a further improvement, the material is high-density polyethylene, such as... Figure 3 As shown, the micro-power turbine rotor consists of a sleeve and fan blades, with a total diameter of 333 mm. The inner diameter of the sleeve is d = 105 mm, and the outer diameter is d = 205 mm. The fan blades are four identical blades evenly distributed around the sleeve, with a blade thickness of 2 mm, a blade length of 280 mm, and a blade width of 128 mm.

[0030] It should be noted that, in this invention application, the terms "comprising," "including," or any other variations thereof are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0031] The above description is merely a specific embodiment of this invention, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features of this application.

Claims

1. An ozone contact tank structure that can reduce the ozone concentration after the reaction and optimize hydraulic efficiency, characterized in that, The ozone contact tank adopts a three-section structure arranged sequentially from front to back, and each section includes a contact chamber and a reaction chamber arranged at the front and back. Each contact chamber is equipped with an ozone emitter, and each reaction chamber has a flow guide baffle at its inlet. Each reaction chamber is equipped with a micro-powered turbine rotor. The lower parts of the contact chambers and reaction chambers of each section are connected, and the upper parts of the reaction chambers and contact chambers of adjacent sections are connected. The ozone contact tank has an inlet at the front and a settling chamber at the rear. The inlet is connected to the contact chamber of the first section. The top of the settling chamber has an exhaust port for exhaust gas and is connected to the reaction chamber of the third section. The lower rear side has an outlet.

2. The ozone contact tank structure as described in claim 1, which reduces the ozone concentration after the reaction and optimizes hydraulic efficiency, is characterized in that... The flow guide baffle is used to guide the fluid, which drives the micro-power turbine rotor to rotate under the action of water.

3. The ozone contact tank structure as described in claim 1, which reduces the ozone concentration after the reaction and optimizes hydraulic efficiency, is characterized in that... The number of ozone emitters is greatest in the first contact chamber and least in the third contact chamber, with the number of ozone emitters decreasing sequentially from the first to the third section.

4. The ozone contact tank structure as described in claim 3, which reduces the ozone concentration after the reaction and optimizes hydraulic efficiency, is characterized in that... Given that the number of indoor ozone emitters in the third segment is n, the number of indoor ozone emitters in the second segment is 2n, and the number of indoor ozone emitters in the first segment is 3n.

5. The ozone contact tank structure as described in claim 2, which reduces the ozone concentration after the reaction and optimizes hydraulic efficiency, is characterized in that... The height and width of the settling chamber are the same as those of the contact chamber and the reaction chamber, and the length is calculated using a formula according to the different hydraulic residence times. The formula for calculating the length of the settling room is: Where V is the volume of the settling chamber; t is the hydraulic residence time; Q 水 This refers to the water flow rate.

6. The ozone contact tank structure as described in claim 1, which reduces the ozone concentration after the reaction and optimizes hydraulic efficiency, is characterized in that... The flow guide baffle is a columnar structure with a certain angle, and its two ends are directly connected to the wall of the ozone contact tank, forming an integral structure with the tank body.

7. The ozone contact tank structure as described in claim 1, which reduces the ozone concentration after the reaction and optimizes hydraulic efficiency, is characterized in that... Each reaction chamber contains a micro-powered turbine rotor consisting of multiple small micro-powered turbine rotors connected in series on a rigid straight column, with both ends of the rigid straight column fixed to the wall of the ozone contact pool.

8. The ozone contact tank structure as described in claim 7, which reduces the ozone concentration after the reaction and optimizes hydraulic efficiency, is characterized in that... Each reaction chamber contains 16 identical small micro-powered turbine rotors made of high-density polyethylene. Each small micro-powered turbine rotor is a four-bladed impeller with a blade thickness of 2mm, a blade length of 280mm, and a blade width of 128mm.

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