Flow guide structure for baffling type disinfection tank and design method of flow guide structure

Abstract

The invention discloses a flow guide structure for a baffling type disinfection tank and a design method thereof, the flow guide structure comprises baffles and flow guide plates arranged in the disinfection tank, the starting ends of the baffles are connected with the inner wall of the disinfection tank, flow channels exist between the open ends of the baffles and the inner wall of the disinfection tank, the multiple baffles are alternately arranged in the disinfection tank in parallel, and the flow guide plates are arranged in the disinfection tank. The guide plate is arranged at the open end of the baffle plate, and gaps exist between the guide plate and the open end of the baffle plate and between the guide plate and the inner wall of the disinfection tank, and the guide plate is used for guiding fluid flowing to the open end of the baffle plate. The inlet of each reaction chamber is divided into a left part and a right part through the guide plate, so that the influence of right-side high-speed fluid on left-side fluid flowing is weakened, meanwhile, the right-side high-speed fluid of each reaction chamber can be guided to flow through the guide plate, the flowing direction of the fluid is optimized, and the flowing speed of the left-side fluid of each reaction chamber is increased; therefore, the area of a backflow low-speed area is reduced, the strength of adherent flow is weakened, and the velocity distribution uniformity of fluid in the reaction chamber is optimized.

Description

Technical Field

[0001] This invention relates to the field of medical wastewater treatment technology, specifically to a flow guiding structure for a baffled disinfection tank and its design method. Background Technology

[0002] Disinfection of medical wastewater is a crucial step in ensuring aquatic ecosystem safety. Its core equipment, the disinfection tank, kills pathogenic microorganisms and removes impurities such as antibiotics by adding chemical disinfectants. However, existing baffle-type disinfection tanks for medical wastewater generally suffer from uneven flow field distribution, specifically manifested in the following drawbacks: (1) The flow field distribution is significantly uneven: In the inlet area of ​​the reaction chamber, the fluid directly impacts the opposite side wall under the action of inertia, and then forms a high-speed flow zone by adhering to the wall. This results in a serious uneven distribution of fluid velocity in the reaction chamber of the disinfection tank along the width (horizontal) and height (vertical) directions, with phenomena such as backflow, local short circuit, and flow dead zone.

[0003] (2) Excessive variation in hydraulic residence time: The uneven flow field leads to significant differences in the actual hydraulic residence time of different fluid micro-clusters in the pool. Some micro-clusters have too short a residence time, resulting in incomplete disinfection and degradation of pathogenic microorganisms and pollutants such as antibiotics; while some micro-clusters have too long a residence time, which increases the risk of generating toxic byproducts.

[0004] (3) Insufficient mixing of disinfectant and wastewater: Due to the non-uniformity of the flow field, the effective mixing of chemical disinfectant and wastewater is reduced, making it difficult to control the amount of disinfectant added. Insufficient addition will cause medical wastewater to fail to meet disinfection standards, while excessive addition will result in an excess of disinfectant at the outlet of the disinfection tank, which will have an adverse impact on the environment.

[0005] Current optimization measures for the flow field within disinfection tanks largely rely on empirical trial-and-error adjustments, such as simply changing the position or size of baffles. These methods fail to be based on in-depth analysis of the specific flow field characteristics within the tank, particularly important flow phenomena such as inlet impact, high-speed flow formation, and the distribution of the recirculation zone. Empirical methods cannot accurately predict and control complex flow field structures, resulting in limited and unreliable improvements in flow field uniformity. Summary of the Invention

[0006] The technical problem to be solved by the present invention is to address the problems of uneven flow field distribution, resulting in local short circuits, dead zones and backflow that are common in existing disinfection tanks. The invention provides a flow guiding structure and its design method for baffled disinfection tanks that is compact, can improve flow field uniformity, optimize hydraulic residence time distribution and enhance fluid mixing effect.

[0007] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows: A flow guiding structure for a baffle-type disinfection tank includes baffles and guide plates disposed within the disinfection tank. Wastewater inlet and outlet are respectively provided at both ends of the disinfection tank. The starting end of the baffle is fixedly connected to the inner wall of the disinfection tank, and a flow channel exists between the open end of the baffle and the inner wall of the disinfection tank. Multiple baffles are arranged alternately in parallel within the disinfection tank to form a baffle-type flow channel reaction chamber. The guide plate is disposed at the open end of the baffle, and gaps exist between the guide plate and both the open end of the baffle and the inner wall of the disinfection tank to guide the fluid flowing to the open end of the baffle.

[0008] As a further improvement of the present invention, the open end of the baffle is located inside the guide plate; the guide plate includes a streamlined curved panel and a straight panel connected to each other, the straight panel is parallel to the baffle, and the starting point of the straight panel is flush with the ending point of the open end of the baffle, and the ending point of the straight panel is flush with the starting point of the straight panel.

[0009] As a general technical concept, the present invention also provides a design method for the flow guiding structure applicable to the above-mentioned baffled disinfection tank, wherein the design of the installation position and shape of the flow guiding plate is carried out sequentially from upstream to downstream of the flow channel reaction chamber in the disinfection tank, including the following steps: Step S1: Set the deviation threshold , Define left-side flowability Centrality Two indicators describe the degree of fluid deviation downstream of the flow channel reaction chamber; Step S2: Initially set the forced flow distribution coefficient α; define the ratio between the forced flow rate of the fluid upstream of the flow channel reaction chamber and the total flow rate of the fluid upstream of the flow channel reaction chamber as the forced flow distribution coefficient; Step S3: Perform numerical simulation of the flow field inside the disinfection tank without a guide plate; Step S4: Based on the forced flow distribution coefficient α and the numerical simulation results, preliminarily design the front / rear end line positions of the guide vane; Step S5: Design the shape of the guide vane; Step S6: Perform numerical simulation of the flow field in the disinfection tank equipped with guide vanes; Step S7: Calculate the "leftward deviation" within the reaction chamber downstream of the guide vane. "and "clustering degree" "Two deflection indexes;" Step S8: Based on "leftward deviation" "and "clustering degree" ", Correct the front / rear end line position of the air deflector; Step S9: Output the position and shape of the flow guide plate, then end.

[0010] As a further improvement of the present invention, in step S1, The value ranges from 0.05 to 0.1.

[0011] As a further improvement of the present invention, in step S2, the value of α is 0.2 to 0.5.

[0012] As a further improvement of the present invention, step S4 further includes: Step S41: The longitudinal distance between the front / rear end line of the air deflector and the open end of the air deflector is set to... ,in, The length of the baffle, coefficient Take a value of 0.1 to 0.25; Step S42: The lateral distance between the front end line of the guide vane and the baffle is set to... ; Step S43: The lateral distance between the rear end line of the guide vane and the baffle is set to... ,in The width of the flow channel reaction chamber.

[0013] As a further improvement of the present invention, in step S42, fluid velocity or flow rate data at the flow cross section where the front end line of the guide vane is located is extracted from the numerical simulation results, and then the flow rate forced distribution coefficient is used to determine the flow rate. Sure .

[0014] As a further improvement of the present invention, step S5 further includes: Step S51: Set the horizontal cross-sectional curve of the streamlined curved panel in the guide vane; Step S52: Set the horizontal cross-sectional shape of the flat panel in the guide vane. Take the line segment between the end line of the streamlined curved panel and the rear end line of the guide vane as the horizontal cross-sectional shape of the flat panel.

[0015] As a further improvement of the present invention, in step S51, streamline diagrams on any horizontal plane within the range of 1 / 3 to 2 / 3 liquid level height are extracted from the numerical simulation results. A streamline passing through the front end line of the guide plate is selected, and then the position point where the streamline is flush with the open end of the baffle in the downstream reaction chamber is selected as the end line of the streamlined curved panel. The shape of the streamline between the front end line of the guide plate and the end line of the streamlined curved panel is the horizontal cross-sectional curve of the streamlined curved panel.

[0016] As a further improvement of the present invention, in step S7, the downstream reaction chamber is 1 to 2 times the distance from the end point of the guide plate. A vertical cross-section is taken along the width of the reaction chamber. This cross-section is divided into three regions of equal area along the width direction. The wastewater flow rates through these three regions are extracted from the numerical simulation results and denoted from left to right as follows: , , Calculate the "left deviation" using the following two formulas. "and "clustering degree" ": (1) (2) In equations (1) and (2), , which is the average flow rate of the three regions.

[0017] Compared with the prior art, the advantages of the present invention are as follows: The present invention relates to a flow guiding structure and its design method for a baffle-type disinfection tank. Addressing the core problem in existing medical wastewater disinfection tanks where the inertial impact of fluid inlet against the right side wall of the baffle causes a high-speed flow channel on the right side of the reaction chamber and a reflux zone on the left side, resulting in severe flow field unevenness, the present invention proposes a solution based on precisely designed guide plates according to the original flow field characteristics. The guide plates guide the high-speed fluid on the right side of each reaction chamber through the guide plates, impacting the low-speed reflux zone at the inlet side of the reaction chamber and weakening the intensity of the wall-attached flow, thereby optimizing the uniformity of velocity distribution within the reaction chamber. This precise intervention weakens the tendency of high-speed fluid to concentrate on the right side wall, disrupts the stability of the reflux zone, effectively reduces its area, and fundamentally improves the uniformity of velocity distribution along both the width and vertical directions within the reaction chamber, achieving the goal of improving flow field uniformity.

[0018] The improvement of flow field uniformity itself helps to enhance fluid mixing and significantly reduce the differences in the flow paths experienced by different fluid micro-clusters, making them more consistent. This directly makes the actual hydraulic residence time distribution of each fluid micro-cluster more concentrated, improves the hydraulic efficiency of the disinfection tank, ensures that the hydraulic residence time of the fluid in the entire area reaches the minimum time required for degradation, and at the same time improves the uniformity of the flow field inside the disinfection tank, avoiding the generation of too many toxic byproducts due to excessive residence time of some fluids. Attached Figure Description

[0019] Figure 1 A schematic diagram of the flow line distribution inside the disinfection tank without a baffle plate; Figure 2 This is a schematic diagram of the overall structural principle of the baffled disinfection tank in a specific embodiment of the present invention; Figure 3 This is a top view schematic diagram of the baffled disinfection tank in a specific embodiment of the present invention; Figure 4 This is a schematic diagram of the design process of the guide plate in a specific embodiment of the present invention; Figure 5Figure (a) shows the hydraulic residence time distribution function and the distribution density function; Figure (b) shows the hydraulic residence time distribution density function.

[0020] Legend: 1. Wastewater inlet; 2. Baffle; 3. Guide plate; 31. Streamlined curved panel; 32. Flat panel; 4. Disinfection tank; 5. Wastewater outlet. Detailed Implementation

[0021] The present invention will be further described below with reference to the accompanying drawings and specific preferred embodiments, but this does not limit the scope of protection of the present invention.

[0022] In the description of this invention, it should be understood that the terms "side", "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0023] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more unless otherwise explicitly specified.

[0024] Example like Figure 2 and Figure 3 As shown, the flow guiding structure for a baffle-type disinfection tank of the present invention includes a baffle 2 and a flow guide plate 3 disposed within the disinfection tank 4. Wastewater inlet 1 and wastewater outlet 5 are respectively disposed at both ends of the disinfection tank 4. The starting end of the baffle 2 is fixedly connected to the inner wall of the disinfection tank 4, and a flow channel exists between the open end of the baffle 2 and the inner wall of the disinfection tank 4. Multiple baffles 2 are arranged alternately in parallel within the disinfection tank 4 to form multiple baffle-type flow channel reaction chambers. The flow guide plate 3 is disposed at the open end of the baffle 2, and gaps exist between the flow guide plate 3, the open end of the baffle 2, and the inner wall of the disinfection tank 4 to guide the fluid flowing to the open end of the baffle 2.

[0025] like Figure 1As shown, when there is no guide plate 3 in the disinfection tank 4, medical wastewater enters the first flow channel reaction chamber from the wastewater inlet 1. In the first flow channel reaction chamber, the wastewater, under the action of inertia, rushes towards the baffle opposite the wastewater inlet 1, thus forming a high-velocity mainstream zone with a relatively high flow rate near the baffle (on the right side of the first flow channel reaction chamber), while a low-velocity zone with a relatively low flow rate, possibly including backflow, is formed near the wall near the wastewater inlet 1. Similarly, due to inertia, the wastewater will also deviate in other flow channel reaction chambers, all showing a distribution pattern of low velocity near the inlet-side baffle and high velocity near the outlet-side baffle. After passing through all reaction chambers in all disinfection tanks 4, the wastewater is discharged from the wastewater outlet 5. Figure 3 As shown, by setting a guide plate 3 at the open end of the baffle 2, a portion of the high-speed fluid near the upstream flow channel reaction chamber is forcibly diverted to the low-speed zone on the left side of the downstream flow channel reaction chamber. like Figure 3 As shown, the open end of the baffle 2 is located inside the guide plate 3. The core function of the guide plate 3 is to "force" a portion of the high-speed fluid in the upstream flow channel reaction chamber to the low-speed region of the downstream flow channel reaction chamber, thereby improving the uniformity of the flow velocity across the flow cross section of the downstream flow channel reaction chamber. The guide plate 3 includes a streamlined curved panel 31 and a straight panel 32 connected to each other. The specific shape of the streamlined curved panel 31 can be determined based on the numerical simulation results of the flow field. The straight panel 32 is parallel to the baffle 2, and the starting point of the straight panel 32 is aligned with the end point of the open end of the baffle 2, while the end point of the straight panel 32 is aligned with the starting point of the straight panel 32.

[0026] In other embodiments, flow guide structures with similar shapes, such as curved surfaces or airfoils, can be used instead of the flow guide plate 3. For example, a curved flow guide structure or an airfoil flow guide structure with a hydrodynamically optimized profile can be used. Its shape, such as an arc or an airfoil cross-section, can more effectively guide the fluid, reduce flow resistance, and more accurately impact the recirculation zone or disperse the mainstream, thereby achieving better flow field uniformity and mixing effect. The profile design of the flow guide structure still needs to be adapted according to the original flow field characteristics, especially the location and range of the recirculation zone.

[0027] In other embodiments, instead of a single guide vane 3, a group (multi-stage) of guide vanes 3 can be arranged on the left side of the baffle 2 or in the area targeting the recirculation zone. These guide vanes 3 can be arranged in parallel or at a specific angle or with a gradient spacing to create a more gradual and smoother flow field guidance and dispersion effect, potentially eliminating high-speed channels and recirculation zones more thoroughly. The number of stages, spacing, and relative angles still need to be determined based on the original flow field characteristics.

[0028] In other embodiments, the function of the guide vane 3 can be integrated with the baffle 2 itself. For example, protrusions, fins, grooves, or openings with guiding functions can be machined or added to specific locations on the baffle 2 (such as the downstream surface near the left side or facing the recirculation zone). This integrated structure also serves to guide the fluid and disrupt the recirculation zone, and simplifies installation.

[0029] In this embodiment, the guide plate 3 is placed in the baffle zone of the baffle-type disinfection tank 4, that is, near the open end of the baffle 2, which has the following beneficial effects: 1) Improve flow field uniformity: By setting a specially structured guide plate 3 in the baffle zone, the flow velocity distribution of wastewater is actively intervened, the phenomenon of excessive concentration of high-speed fluid on the right side wall of the flow channel reaction chamber is suppressed, and the velocity distribution uniformity on the flow cross section of the flow channel reaction chamber of the disinfection tank 4 is improved.

[0030] 2) Optimize hydraulic residence time distribution: By improving flow field uniformity and promoting mixing, the hydraulic residence time distribution of each fluid micro-particle is more concentrated, avoiding or mitigating the risk of over- or under-disinfection caused by excessively long or short residence times of some fluid micro-particles.

[0031] 3) Enhance fluid mixing effect: The guide plate 3 guides the high-speed fluid to impact the original low-speed backflow zone, enhances the momentum exchange between fluids in different flow velocity zones, and significantly improves the mixing efficiency of disinfectant and wastewater.

[0032] like Figure 4 As shown, this embodiment provides a design method applicable to the above-described flow guiding structure. The design of the installation position and shape of the flow guiding plate 3 proceeds sequentially from upstream to downstream of the flow channel reaction chamber in the disinfection pool 4, including the following steps: Step S1: Set the deviation threshold , More preferably, it is 0.05 to 0.1. Left-deflection flow rate is defined. Centrality Two indicators describe the degree of fluid deviation downstream of the flow channel reaction chamber; the deviation threshold is used to evaluate the rationality of the position and shape of the guide plate 3.

[0033] Step S2: Initially set the forced flow distribution coefficient α, preferably between 0.2 and 0.5; define the ratio between the forced flow rate of the fluid upstream of the flow channel reaction chamber (i.e., the fluid flow rate to the right of the guide plate front end line) and the total flow rate of the fluid upstream of the flow channel reaction chamber (i.e., the total flow rate on the flow section where the guide plate front end line is located) as the forced flow distribution coefficient; the forced flow distribution coefficient is used to initially design the front and rear end line positions of the guide plate 3. Different forced flow distribution coefficients can be set for guide plates 3 at different positions, or the same forced flow distribution coefficient can be set.

[0034] Step S3: Perform numerical simulation of the flow field inside the disinfection tank 4 under the condition of no guide plate 3.

[0035] Step S4: Based on the forced flow distribution coefficient α and the numerical simulation results, the initial design of the front / rear end line positions of the guide vane 3 is performed. Specifically: Step S41: The longitudinal distance between the front / rear end line of the guide vane 3 and the open end of the guide vane 3 is set to... ,in, The length of baffle 2, coefficient The value should be between 0.1 and 0.25, with 0.125 being preferred. For accurate settings, refer to the numerical simulation results in step S3. Ensure that the front end line of the guide plate 3 is in the stable flow (straight streamline) region of the upstream flow channel reaction chamber.

[0036] Step S42: The lateral distance between the front end line of the guide vane 3 and the baffle 2 is set to... Specifically, fluid velocity or flow rate data at the flow cross-section where the front end of the guide vane 3 is located is extracted from the numerical simulation results, and then the flow rate is determined based on the forced distribution coefficient. Sure Ensure that the flow rate on the right side of the front end of the guide vane 3 accounts for the proportion of the total flow rate of the cross section. That is, to ensure that there is a certain amount of total flow. A proportionate amount of fluid is introduced into the left side of the downstream flow channel reaction chamber.

[0037] Step S43: The lateral distance between the rear end line of the guide vane 3 and the baffle 2 is set to... ,in The width of the flow channel reaction chamber.

[0038] Step S5: Design the shape of the guide vane 3, specifically as follows: Step S51: Set the horizontal cross-sectional curve of the streamlined curved panel 31 in the guide vane 3. Extract the streamline diagram from any horizontal plane within the 1 / 3 to 2 / 3 liquid level height range from the numerical simulation results. Select the streamline passing through the front end line of the guide vane 3, and then select the point where this streamline is flush with the open end of the baffle 2 in the downstream reaction chamber as the terminal line of the streamlined curved panel 31. The shape of the streamline between the front end line of the guide vane 3 and the terminal line of the streamlined curved panel 31 is the horizontal cross-sectional curve of the streamlined curved panel 31. It can be understood that in other embodiments, a method based on numerical simulation or a simplified method can also be used, for example, simplified to a combination of straight lines and arcs.

[0039] Step S52: Set the horizontal cross-sectional shape of the flat panel 32 in the guide vane 3, and take the line segment between the end line of the streamlined curved panel 31 and the rear end line of the guide vane 3 as the horizontal cross-sectional shape of the flat panel 32.

[0040] Step S6: Perform numerical simulation of the flow field inside the disinfection tank 4 with the guide plate 3 arranged; Step S7: Calculate the "leftward deviation" in the reaction chamber downstream of the guide vane 3. "and "clustering degree" "Two flow deviation indices. Specifically, the distance from the downstream reaction chamber to the guide vane end point is 1 to 2 times..." A vertical cross-section is taken along the width of the reaction chamber. This cross-section is divided into three regions of equal area along the width direction. The wastewater flow rates through these three regions are extracted from the numerical simulation results and denoted from left to right as follows: , , Calculate the "left deviation" using the following two formulas. "and "clustering degree" ": (1) (2) In equations (1) and (2), , which is the average flow rate of the three regions.

[0041] Step S8: Based on "leftward deviation" "and "clustering degree" ", Correct the front / rear end line positions of the guide vane 3; the specific rules are shown in Table 1.

[0042] Table 1. Correction Rules for Front / Rear End Lines of the Deflector

[0043] Step S9: Output the position and shape of the flow guide plate 3, then end.

[0044] In this embodiment, the design parameters (shape, size, and position) of the guide vane 3 are specifically matched to the characteristics (such as position, range, and intensity) of the recirculation region formed on the inlet side of the reaction chamber (especially the right side of the baffle 2) when the guide vane 3 is not added. In actual implementation, the shape and position parameters of the guide vane 3 need to be flexibly designed according to the specific characteristics of the recirculation region. The above parameters are adaptable and flexible and not fixed, so as to achieve the best fit between the guide vane structure and the flow field characteristics.

[0045] Hydraulic residence time is an important parameter for evaluating hydraulic efficiency. The theoretical hydraulic residence time is equal to the ratio of the reactor's effective volume to the fluid volumetric flow rate. However, due to the non-uniform flow field within the reactor, such as the presence of short-circuiting and dead zones, the actual hydraulic residence time varies for different fluid particles. Therefore, the actual hydraulic residence time refers to the actual time required for the fluid to completely exit the reaction chamber after entering. To verify the flow guiding effect of the guide plate 3 in this embodiment, the specific hydraulic residence time distribution function and distribution density function are shown below. Figure 5As shown in the diagram, ST-1 represents the operating condition of the typical disinfection tank 4 without any improvements, ST-2 represents the operating condition of the disinfection tank 4 after adding baffle 2, and ST-3 represents the operating condition of the disinfection tank 4 after adding guide plate 3 based on the flow field characteristics. The peak value of the distribution density function of ST-3 is significantly higher than that of ST-1 and ST-2, indicating that more fluid particles flow out of the disinfection tank 4 within a similar time period under this condition, and its hydraulic residence time distribution is more concentrated, resulting in a more ideal treatment effect for medical wastewater.

[0046] In this embodiment, the design and arrangement of the guide plate 3 serves two purposes. First, the guide plate 3 divides the inlet of each flow channel reaction chamber into left and right parts, reducing the impact of the high-speed fluid on the left side. Second, by guiding the high-speed fluid on the right side of each flow channel reaction chamber through the guide plate 3, the flow direction of the fluid is optimized, increasing the flow velocity of the fluid on the left side of each flow channel reaction chamber. This reduces the area of ​​the low-speed backflow zone, weakens the intensity of the wall-attached flow, and optimizes the uniformity of the velocity distribution within the reaction chamber. The uniform flow field improves the mixing effect within the disinfection tank, allowing each fluid micro-particle to flow out of the disinfection tank within a similar time period. The hydraulic residence time distribution is more concentrated, improving hydraulic efficiency and avoiding the problems of over-reaction and under-reaction.

[0047] The above description is merely a preferred embodiment of the present invention. The scope of protection of the present invention is not limited to the above embodiments. All technical solutions falling within the scope of the present invention's concept are within the scope of protection of the present invention. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principles of the present invention should also be considered within the scope of protection of the present invention.

Claims

1. A flow guiding structure for a baffle-type disinfection tank, characterized in that, The system includes a baffle (2) and a guide plate (3) installed in the disinfection tank (4). The two ends of the disinfection tank (4) are respectively provided with a wastewater inlet (1) and a wastewater outlet (5). The starting end of the baffle (2) is connected and fixed to the inner wall of the disinfection tank (4). There is a flow channel between the open end of the baffle (2) and the inner wall of the disinfection tank (4). Multiple baffles (2) are arranged alternately in parallel in the disinfection tank (4) to form a zigzag flow channel reaction chamber. The guide plate (3) is installed at the open end of the baffle (2). There are gaps between the guide plate (3) and the open end of the baffle (2) and the inner wall of the disinfection tank (4) to guide the fluid flowing to the open end of the baffle (2).

2. The flow guiding structure for a baffle-type disinfection tank according to claim 1, characterized in that, The open end of the baffle (2) is located inside the guide plate (3); the guide plate (3) includes a streamlined curved panel (31) and a flat panel (32) connected to each other. The flat panel (32) is parallel to the baffle (2), and the starting point of the flat panel (32) is flush with the end point of the open end of the baffle (2), and the end point of the flat panel (32) is flush with the starting point of the flat panel (32).

3. A design method for a flow guiding structure applicable to the baffle-type disinfection tank as described in claim 1 or 2, characterized in that, The installation position and shape of the guide plate (3) are designed sequentially from upstream to downstream of the flow channel reaction chamber in the disinfection pool (4), including the following steps: Step S1: Set the deviation threshold , Define left-side flowability Centrality Two indicators describe the degree of fluid deviation downstream of the flow channel reaction chamber; Step S2: Initially set the forced flow distribution coefficient α; define the ratio between the forced flow rate of the fluid upstream of the flow channel reaction chamber and the total flow rate of the fluid upstream of the flow channel reaction chamber as the forced flow distribution coefficient; Step S3: Perform numerical simulation of the flow field inside the disinfection tank (4) without the guide plate (3); Step S4: Based on the forced flow distribution coefficient α and the numerical simulation results, the front / rear end line positions of the guide plate (3) are initially designed; Step S5: Design the shape of the guide vane (3); Step S6: Perform numerical simulation of the flow field inside the disinfection tank (4) with the guide plate (3) arranged; Step S7: Calculate the leftward deviation of the flow channel reaction chamber downstream of the guide vane (3). "and" concentration "Two deflection indexes;" Step S8: Based on "leftward deviation" "and" concentration ", correct the front / rear end line position of the guide vane (3); Step S9: Determine the position and shape of the output guide plate (3), then end.

4. The design method according to claim 3, characterized in that, In step S1 The value ranges from 0.05 to 0.

1.

5. The design method according to claim 3, characterized in that, In step S2, the value of α is 0.2 to 0.

5.

6. The design method according to claim 3, characterized in that, Step S4 further includes: Step S41: The longitudinal distance between the front / rear end line of the guide plate (3) and the open end of the guide plate (3) is set to... ,in, The length of baffle (2) is given by the coefficient. Take a value of 0.1 to 0.25; Step S42: The lateral distance between the front end line of the guide vane (3) and the baffle (2) is set to... ; Step S43: The lateral distance between the rear end line of the guide vane (3) and the baffle (2) is set to... ,in The width of the flow channel reaction chamber.

7. The design method according to claim 6, characterized in that, In step S42, fluid velocity or flow rate data at the flow cross section where the front end line of the guide vane (3) is located is extracted from the numerical simulation results, and then the flow rate is determined according to the forced distribution coefficient. Sure .

8. The design method according to claim 3, characterized in that, Step S5 further includes: Step S51: Set the horizontal cross-sectional curve of the streamlined curved panel (31) in the guide vane (3); Step S52: Set the horizontal cross-sectional shape of the flat panel (32) in the guide plate (3). Take the line segment between the end line of the streamlined curved panel (31) and the rear end line of the guide plate (3) as the horizontal cross-sectional shape of the flat panel (32).

9. The design method according to claim 8, characterized in that, In step S51, streamline diagrams are extracted from any horizontal plane within the range of 1 / 3 to 2 / 3 of the liquid level height from the numerical simulation results. A streamline passing through the front end line of the guide plate (3) is selected, and then the position point where the streamline is flush with the open end of the baffle (2) in the downstream reaction chamber is selected as the end line of the streamline curved panel (31). The shape of the streamline between the front end line of the guide plate (3) and the end line of the streamline curved panel (31) is the horizontal cross-sectional curve of the streamline curved panel (31).

10. The design method according to claim 3, characterized in that, In step S7, the downstream reaction chamber is 1 to 2 times the distance from the end point of the guide plate (3). A vertical cross-section is taken along the width of the reaction chamber. This cross-section is divided into three regions of equal area along the width direction. The wastewater flow rates through these three regions are extracted from the numerical simulation results and denoted from left to right as follows: , , Calculate the "left deviation" using the following two formulas. "and" concentration ": （1） （2） In equations (1) and (2), , which is the average flow rate of the three regions.

Images