Nitrification liquid backflow arrangement structure

Abstract

The utility model discloses a nitrification liquid backflow arrangement structure which comprises a denitrification tank, a water distribution pipe network is distributed at the bottom of the denitrification tank, the water distribution pipe network is connected with a nitrification liquid backflow pipeline, a plurality of water distribution units are arranged on the water distribution pipe network, and each water distribution unit comprises a Venturi tube and a reflection guide plate arranged at the bottom of the denitrification tank. One end of the Venturi tube is communicated with the water distribution pipe network, the other end is connected with an accelerating tube, and the outlet end of the accelerating tube faces the reflection guide plate. According to the scheme, flowing mixing of sewage and nitrification liquid in the denitrification tank is accelerated, and the denitrification treatment effect of the sewage in the denitrification tank is improved; meanwhile, the backflow water distribution speed of the nitrification liquid is increased, and the mixing speed of sewage and the nitrification liquid in the denitrification tank is accelerated.

Description

TECHNICAL FIELD

[0001] The utility model relates to sewage treatment filtration technical field especially is involved in a kind of nitration liquid backflow arrangement structure. BACKGROUND

[0002] The nitration liquid backflow system in sewage treatment is an important component in the biological treatment process of sewage, which plays a crucial role in improving nitrogen removal efficiency and improving effluent quality. The principle of nitration liquid backflow is mainly to achieve the denitrification process of nitrification reaction. In the process of sewage treatment, ammonia nitrogen in sewage is converted into nitrate nitrogen through nitrification reaction. Subsequently, the nitration liquid backflow system returns these nitrate nitrogen to the denitrification tank through the backflow pipeline, providing combined-state oxygen (actually nitrate as electron acceptor) for denitrification reaction, and converting nitrate nitrogen into nitrogen gas released into the atmosphere, thereby achieving denitrification effect.

[0003] The nitration liquid backflow arrangement structure is a device for uniform water distribution to the denitrification tank. The effect of sewage treatment by the denitrification tank is directly related to the uniform water distribution capability of the nitration liquid backflow arrangement structure. The existing nitration liquid backflow arrangement structure has the problem of uneven water distribution of nitration liquid backflow, which affects the effect of sewage treatment.

[0004] For example, Chinese patent publication No. CN219752060U, published on September 26, 2023, named "arrangement structure of nitration liquid backflow hydraulic stirring mixed denitrification zone", including denitrification zone, denitrification zone is provided with sewage inlet, sewage outlet and nitration liquid backflow inlet, the bottom of the denitrification zone is provided with water distribution and stirring pipe for water distribution and stirring, water distribution and stirring pipe is connected with nitration liquid backflow inlet, denitrification zone is provided with nitration liquid backflow pipeline outside, one end of nitration liquid backflow pipeline is connected with nitration liquid backflow inlet of denitrification zone, the other end is connected with nitration liquid backflow outlet at the end of aerobic tank, nitration liquid backflow pump is arranged on nitration liquid backflow pipeline.

[0005] The existing patent has the following disadvantages: the existing nitration liquid backflow arrangement structure has the problem of uneven water distribution of nitration liquid backflow and poor sewage mixing effect, which affects the effect of sewage treatment. INVENTION CONTENTS

[0006] The utility model aims at improving the problem of uneven water distribution of nitration liquid backflow and poor sewage mixing effect of the existing nitration liquid backflow arrangement structure, which affects the effect of sewage treatment, and provides a nitration liquid backflow arrangement structure that enhances the uniformity of nitration liquid backflow and improves the sewage mixing effect.

[0007] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme:

[0008] The application discloses a nitration liquid reflux arrangement structure, which comprises a denitrification tank, a water distribution pipe network is arranged on the bottom of the denitrification tank, a nitration liquid reflux pipeline is connected to the water distribution pipe network, and a plurality of water distribution units are arranged on the water distribution pipe network; each water distribution unit comprises a Venturi tube and a reflection guide plate arranged on the bottom of the denitrification tank; one end of the Venturi tube is communicated with the water distribution pipe network, and the other end of the Venturi tube is connected with an acceleration pipe; and the outlet end of the acceleration pipe faces the reflection guide plate. According to the nitration liquid reflux arrangement structure, the water distribution pipe network is arranged on the bottom of the denitrification tank, the nitration liquid is refluxed to the bottom of the denitrification tank through the nitration liquid reflux pipeline, the nitration liquid flows towards the reflection guide plate in sequence through the Venturi tube and the acceleration pipe, and then flows upwards along the reflection guide plate; the Venturi tube and the acceleration pipe are used for making the nitration liquid transit from a wide area to a narrow area, so that the flow rate of the nitration liquid is increased, the flow rate of the nitration liquid at the outlet end of the acceleration pipe is increased, and the nitration liquid can flow upwards along the reflection guide plate, thereby accelerating the flow mixing of the sewage and the nitration liquid in the denitrification tank, improving the denitrification treatment effect of the sewage in the denitrification tank, improving the water distribution speed of the nitration liquid reflux, and accelerating the mixing speed of the sewage and the nitration liquid in the denitrification tank; compared with the prior art, the nitration liquid reflux arrangement structure can solve the problems of uneven water distribution of the nitration liquid reflux and poor mixing effect of the sewage, can prevent the nitration liquid from being uniformly mixed with the sewage at the bottom of the denitrification tank, and can improve the overall sewage treatment effect in the denitrification tank.

[0009] As preferred, the reflection guide plate comprises an inclined surface arranged obliquely upwards, and the outlet end of the acceleration pipe is matched with the inclined surface of the reflection guide plate. The height of the inclined surface of the reflection guide plate matched with the acceleration pipe on the side close to the acceleration pipe is lower than the height on the side far from the acceleration pipe.

[0010] As preferred, the contraction section of the Venturi tube is connected with a suction pipe, and the suction pipe is communicated with the Venturi tube. As known in the prior art, the Venturi tube comprises an inlet section, a contraction section and a diffusion section. The inlet section guides the fluid to enter smoothly, the contraction section gradually accelerates the fluid, and the diffusion section gradually decelerates the fluid to reduce the turbulence. The contraction section of the Venturi tube is connected with the suction pipe, and the suction pipe sucks the sewage in the denitrification tank into the Venturi tube, thereby further accelerating the mixing speed of the sewage and the nitration liquid in the denitrification tank and improving the denitrification treatment effect of the sewage in the denitrification tank.

[0011] As preferred, the water distribution pipe network comprises a plurality of water distribution branch pipes arranged in parallel on the bottom of the denitrification tank, and the Venturi tubes are uniformly arranged on the water distribution branch pipes. The water distribution uniformity of the nitration liquid reflux is further promoted, and the mixing effect of the sewage is improved.

[0012] As preferred, the number of the reflection guide plates is multiple, and the multiple reflection guide plates are arranged in parallel on the bottom of the denitrification tank.

[0013] As preferred, the cross-sectional area of the outlet end of the acceleration pipe is smaller than that of the inlet end of the acceleration pipe, so that the nitrification liquid is transitioned from a wider area to a narrower area, thereby increasing the flow rate of the nitrification liquid, and the increased flow rate of the nitrification liquid at the outlet end of the acceleration pipe is capable of flowing upward along the reflection flow guide plate, thereby accelerating the flow mixing of the sewage and the nitrification liquid in the denitrification tank, improving the denitrification treatment effect of the sewage in the denitrification tank, and meanwhile, increasing the backflow distribution speed of the nitrification liquid and accelerating the mixing speed of the sewage and the nitrification liquid in the denitrification tank.

[0014] As preferred, the Venturi pipe and the acceleration pipe are horizontally arranged, and the suction pipe is vertically arranged on the Venturi pipe.

[0015] As preferred, the Venturi pipe is threadedly connected with the water distribution pipe network, so that the installation and dismounting are more convenient.

[0016] As preferred, the water distribution branch pipe is arranged in parallel with the length direction of the reflection flow guide plate, and one reflection flow guide plate can correspond to a plurality of Venturi pipes.

[0017] As preferred, the water distribution pipe network is supported on the bottom of the denitrification tank through the support piers.

[0018] Therefore, the utility model has the following beneficial effects: the flow mixing of the sewage and the nitrification liquid in the denitrification tank is accelerated, the denitrification treatment effect of the sewage in the denitrification tank is improved, and meanwhile, the backflow distribution speed of the nitrification liquid is increased and the mixing speed of the sewage and the nitrification liquid in the denitrification tank is accelerated. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 is a structural schematic view of the utility model.

[0020] Figure 2 is a structural schematic view of the water distribution unit removing the reflection flow guide plate in the utility model.

[0021] Figure 3 is a structural schematic view of the water distribution unit in the utility model.

[0022] As shown in the figure:

[0023] denitrification tank 1,

[0024] water distribution pipe network 2, water distribution branch pipe 2.1,

[0025] nitrification liquid backflow pipeline 3,

[0026] water distribution unit 4, Venturi pipe 4.1, acceleration pipe 4.2, suction pipe 4.3, reflection flow guide plate 4.4,

[0027] support pier 5. DETAILED DESCRIPTION

[0028] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the utility model will be further described below in conjunction with the accompanying drawings and specific implementation methods.

[0029] Example 1, as Figure 1 , Figure 2 , Figure 3 The nitrification liquid return arrangement structure shown includes a denitrification tank 1, a water distribution network 2 distributed at the bottom of the denitrification tank 1, a nitrification liquid return pipeline 3 connected to the water distribution network 2, and a plurality of water distribution units 4 provided on the water distribution network 2. The water distribution unit 4 includes a venturi tube 4.1 and a reflective guide plate 4.4 set at the bottom of the denitrification tank 1. One end of the venturi tube 4.1 is connected to the water distribution network 2, and the other end is connected to an acceleration tube 4.2. The outlet end of the acceleration tube 4.2 faces the reflective guide plate 4.4.

[0030] The nitrification liquor recirculation system is a crucial component of biological wastewater treatment, playing a vital role in improving denitrification efficiency and effluent quality. The working principle of nitrification liquor recirculation is primarily to facilitate the denitrification process through nitrification. During wastewater treatment, ammonia nitrogen in the wastewater is converted into nitrate nitrogen through nitrification. Subsequently, the nitrification liquor recirculation system returns this nitrate nitrogen to denitrification tank 1 via recirculation pipelines, providing combined oxygen (actually nitrate as an electron acceptor) for the denitrification reaction. This process converts nitrate nitrogen into nitrogen gas, which is released into the atmosphere, thus achieving the denitrification effect.

[0031] The nitrification liquor recirculation arrangement structure is a device for uniformly distributing water to the denitrification tank 1. The wastewater treatment effect of the denitrification tank 1 is directly related to the uniform water distribution capability of the nitrification liquor recirculation arrangement structure. Existing nitrification liquor recirculation arrangement structures suffer from uneven nitrification liquor recirculation water distribution, affecting the wastewater treatment effect. To improve the problems of uneven nitrification liquor recirculation water distribution and poor wastewater mixing effect in existing nitrification liquor recirculation arrangement structures, a nitrification liquor recirculation arrangement structure is provided that enhances the uniformity of nitrification liquor recirculation water distribution and improves the wastewater mixing effect.

[0032] The nitration liquid reflux arrangement structure in one of the above embodiments, the water distribution pipe network 2 is distributed at the bottom of the denitrification tank 1, the water distribution pipe network 2 is connected with the nitration liquid reflux pipeline 3, and the nitration liquid reflux pipeline 3 is used for refluxing the nitration liquid to the bottom of the denitrification tank 1, the nitration liquid flows towards the reflective guide plate 4.4 through the Venturi tube 4.1 and the acceleration pipe 4.2 in sequence, and flows upwards along the reflective guide plate 4.4, the Venturi tube 4.1 and the acceleration pipe 4.2 increase the flow rate of the nitration liquid by making the nitration liquid transition from a wider area to a narrower area, so that the flow rate of the nitration liquid at the outlet end of the acceleration pipe 4.2 is increased to flow upwards along the reflective guide plate 4.4, thereby accelerating the flow mixing of the sewage and the nitration liquid in the denitrification tank 1, improving the denitrification treatment effect of the sewage in the denitrification tank 1, and meanwhile, improving the water distribution speed of the nitration liquid reflux and the mixing speed of the sewage and the nitration liquid in the denitrification tank 1, compared with the existing nitration liquid reflux arrangement structure, the technical scheme improves the problems of uneven water distribution of the nitration liquid reflux and poor sewage mixing effect of the existing nitration liquid reflux arrangement structure, prevents the problem that the nitration liquid cannot be uniformly mixed with the sewage at the bottom of the denitrification tank 1, and improves the overall sewage treatment effect in the denitrification tank 1.

[0033] Embodiment two, as shown in Figure 1 , Figure 2 , Figure 3 a kind of nitration liquid reflux arrangement structure, including denitrification tank 1, denitrification tank 1 bottom is distributed with water distribution pipe network 2, water distribution pipe network 2 is connected with nitration liquid reflux pipeline 3, water distribution pipe network 2 is equipped with several water distribution units 4, water distribution unit 4 includes Venturi tube 4.1 and the reflective guide plate 4.4 arranged at the bottom of denitrification tank 1, one end of Venturi tube 4.1 is communicated with water distribution pipe network 2, the other end is connected with acceleration pipe 4.2, the outlet end of acceleration pipe 4.2 is towards reflective guide plate 4.4.

[0034] In the embodiment, the reflective guide plate 4.4 includes an inclined surface arranged obliquely upwards, and the outlet end of the acceleration pipe 4.2 cooperates with the inclined surface of the reflective guide plate 4.4. The height of the inclined surface of the reflective guide plate 4.4 that cooperates with the acceleration pipe 4.2 on the side close to the cooperating acceleration pipe 4.2 is lower than the height on the side away from the cooperating acceleration pipe 4.2.

[0035] Further optimize the water distribution pipe network 2, as shown in Figure 1 , the water distribution pipe network 2 includes several water distribution branch pipes 2.1 distributed in parallel at the bottom of the denitrification tank 1, and the Venturi tubes 4.1 are uniformly distributed on each water distribution branch pipe 2.1. Further promote the uniformity of the nitration liquid reflux water distribution and improve the sewage mixing effect.

[0036] Further optimize the reflective guide plate 4.4, as shown in Figure 1 , Figure 2 , Figure 3 , the number of reflective guide plates 4.4 is multiple, and the multiple reflective guide plates 4.4 are distributed in parallel at the bottom of the denitrification tank 1.

[0037] The acceleration pipe 4.2 is further optimized, as shown in Figure 1 、 Figure 2 、 Figure 3 The outlet end cross-sectional area of the acceleration pipe 4.2 is smaller than the inlet end cross-sectional area of the acceleration pipe 4.2. The nitration liquid is transitioned from a wider area to a narrower area, so as to increase the flow rate of the nitration liquid, so that the flow rate of the nitration liquid at the outlet end of the acceleration pipe 4.2 is increased to flow upward along the reflection guide plate 4.4, thereby accelerating the flow mixing of the sewage and the nitration liquid in the denitrification tank 1, improving the denitrification treatment effect of the sewage in the denitrification tank 1; at the same time, the backflow distribution speed of the nitration liquid is increased, and the mixing speed of the sewage and the nitration liquid in the denitrification tank 1 is accelerated.

[0038] The Venturi pipe 4.1 and the acceleration pipe 4.2 are further optimized, as shown in Figure 1 、 Figure 2 、 Figure 3 The Venturi pipe 4.1 and the acceleration pipe 4.2 are both horizontally arranged, and the suction pipe 4.3 is vertically arranged on the Venturi pipe 4.1. The suction pipe 4.3 and the Venturi pipe 4.1 are vertically arranged.

[0039] The Venturi pipe 4.1 is further optimized, and the Venturi pipe 4.1 is threadedly connected with the water distribution pipe network 2. The installation and disassembly are more convenient.

[0040] The reflection guide plate 4.4 is further optimized, as shown in Figure 1 、 Figure 3 The water distribution branch pipe 2.1 is arranged in parallel with the length direction of the reflection guide plate 4.4. One reflection guide plate 4.4 can correspond to several Venturi pipes 4.1.

[0041] The water distribution pipe network 2 is further optimized, as shown in Figure 1 The water distribution pipe network 2 is supported on the bottom of the denitrification tank 1 by the support pier 5.

[0042] In one embodiment of the above-described nitrification liquid recirculation arrangement, a water distribution network 2 is distributed at the bottom of the denitrification tank 1. The water distribution network 2, through the nitrification liquid recirculation pipeline 3, allows the nitrification liquid to recirculate back to the bottom of the denitrification tank 1. The nitrification liquid flows sequentially through the Venturi tube 4.1 and the acceleration tube 4.2 toward the reflective guide plate 4.4, and flows upward along the reflective guide plate 4.4. The Venturi tube 4.1 and the acceleration tube 4.2 increase the flow velocity of the nitrification liquid by transitioning it from a wider area to a narrower area, so that the increased flow velocity of the nitrification liquid at the outlet end of the acceleration tube 4.2 can flow along the reflective guide plate. Plate 4.4 flows upward, thereby accelerating the flow and mixing of wastewater and nitrified liquid in denitrification tank 1, and improving the denitrification treatment effect of wastewater in denitrification tank 1; at the same time, it increases the nitrified liquid return water distribution speed, accelerating the mixing speed of wastewater and nitrified liquid in denitrification tank 1. Compared with the existing nitrified liquid return arrangement structure, this technical solution improves the problems of uneven nitrified liquid return water distribution and poor wastewater mixing effect in the existing nitrified liquid return arrangement structure, prevents the problem of nitrified liquid not being able to mix evenly with wastewater at the bottom of denitrification tank 1, and improves the overall wastewater treatment effect in denitrification tank 1.

[0043] Therefore, this invention accelerates the flow and mixing of wastewater and nitrification liquid in the denitrification tank, improving the denitrification effect of wastewater in the denitrification tank; at the same time, it increases the reflux distribution speed of nitrification liquid, accelerating the mixing speed of wastewater and nitrification liquid in the denitrification tank.

[0044] Example 3, as Figure 1 , Figure 2 , Figure 3 The nitrification liquid return arrangement structure shown includes a denitrification tank 1, a water distribution network 2 distributed at the bottom of the denitrification tank 1, a nitrification liquid return pipeline 3 connected to the water distribution network 2, and a plurality of water distribution units 4 provided on the water distribution network 2. The water distribution unit 4 includes a venturi tube 4.1 and a reflective guide plate 4.4 set at the bottom of the denitrification tank 1. One end of the venturi tube 4.1 is connected to the water distribution network 2, and the other end is connected to an acceleration tube 4.2. The outlet end of the acceleration tube 4.2 faces the reflective guide plate 4.4.

[0045] In this embodiment, the converging section of the Venturi tube 4.1 is connected to a suction pipe 4.3, and the suction pipe 4.3 is connected to the Venturi tube 4.1. As is known in the prior art, the Venturi tube 4.1 includes an inlet section, a converging section, and a diffuser section. The inlet section guides the fluid to enter smoothly, the converging section gradually accelerates the fluid, and the diffuser section gradually decelerates the fluid, reducing turbulence. The suction pipe 4.3 is connected to the converging section of the Venturi tube 4.1, and the suction pipe 4.3 draws wastewater from the denitrification tank 1 into the Venturi tube 4.1, further accelerating the mixing speed of the wastewater and nitrified liquid in the denitrification tank 1, and improving the nitrogen removal effect of the wastewater in the denitrification tank 1.

[0046] Specifically, the reflection flow guide plate 4.4 includes an inclined surface arranged obliquely upward, and the outlet end of the acceleration pipe 4.2 is matched with the inclined surface of the reflection flow guide plate 4.4. The height of the inclined surface of the reflection flow guide plate 4.4 matched with the acceleration pipe 4.2 near the side matched with the acceleration pipe 4.2 is lower than the height of the side far away from the acceleration pipe 4.2.

[0047] The water distribution pipe network 2 is further optimized, as shown in Figure 1 The water distribution pipe network 2 includes a plurality of water distribution branch pipes 2.1 distributed in parallel at the bottom of the denitrification tank 1, and the Venturi pipes 4.1 are uniformly distributed on each water distribution branch pipe 2.1. Further promote the uniformity of the nitrification liquid reflux and water distribution, and improve the sewage mixing effect.

[0048] The reflection flow guide plate 4.4 is further optimized, as shown in Figure 1 , Figure 2 , Figure 3 The number of the reflection flow guide plates 4.4 is multiple, and the multiple reflection flow guide plates 4.4 are distributed in parallel at the bottom of the denitrification tank 1.

[0049] The acceleration pipe 4.2 is further optimized, as shown in Figure 1 , Figure 2 , Figure 3 The cross-sectional area of the outlet end of the acceleration pipe 4.2 is smaller than the cross-sectional area of the inlet end of the acceleration pipe 4.2. So that the nitrification liquid transits from a wider area to a narrower area, thereby increasing the flow rate of the nitrification liquid. The increased flow rate of the nitrification liquid at the outlet end of the acceleration pipe 4.2 can flow upward along the reflection flow guide plate 4.4, thereby accelerating the flow mixing of the sewage and the nitrification liquid in the denitrification tank 1, improving the denitrification treatment effect of the sewage in the denitrification tank 1; at the same time, the speed of the nitrification liquid reflux and water distribution is improved, and the mixing speed of the sewage and the nitrification liquid in the denitrification tank 1 is accelerated.

[0050] The Venturi pipe 4.1 and the acceleration pipe 4.2 are further optimized, as shown in Figure 1 , Figure 2 , Figure 3 The Venturi pipe 4.1 and the acceleration pipe 4.2 are both horizontally arranged, and the suction pipe 4.3 is vertically arranged on the Venturi pipe 4.1. The suction pipe 4.3 and the Venturi pipe 4.1 are vertically arranged.

[0051] The Venturi pipe 4.1 is further optimized, and the Venturi pipe 4.1 is threadedly connected with the water distribution pipe network 2. The installation and disassembly are more convenient.

[0052] The reflection flow guide plate 4.4 is further optimized, as shown in Figure 1 , Figure 3 The water distribution branch pipe 2.1 is arranged in parallel with the length direction of the reflection flow guide plate 4.4. One reflection flow guide plate 4.4 can correspond to a plurality of Venturi pipes 4.1.

[0053] The water distribution pipe network 2 is further optimized, as shown inFigure 1 The water distribution pipe network 2 is supported on the bottom of the denitrification tank 1 by the support 5.

[0054] In one of the above embodiments, the nitration liquid reflux arrangement is distributed on the bottom of the denitrification tank 1 by the water distribution pipe network 2, the water distribution pipe network 2 is connected to the bottom of the denitrification tank 1 by the nitration liquid reflux pipeline 3, the nitration liquid flows to the reflection guide plate 4.4 through the Venturi tube 4.1 and the acceleration tube 4.2 in sequence, and flows upward along the reflection guide plate 4.4, the Venturi tube 4.1 and the acceleration tube 4.2 increase the flow rate of the nitration liquid by making the nitration liquid transition from a wider area to a narrower area, so that the flow rate of the nitration liquid at the outlet end of the acceleration tube 4.2 is increased to flow upward along the reflection guide plate 4.4, thereby accelerating the flow mixing of the sewage and the nitration liquid in the denitrification tank 1, improving the denitrification treatment effect of the sewage in the denitrification tank 1; at the same time, the water distribution speed of the nitration liquid reflux is improved, and the mixing speed of the sewage and the nitration liquid in the denitrification tank 1 is accelerated, compared with the existing nitration liquid reflux arrangement, the technical scheme improves the problems of uneven water distribution of the nitration liquid reflux, poor sewage mixing effect and the like of the existing nitration liquid reflux arrangement, prevents the problem that the nitration liquid cannot be uniformly mixed with the sewage at the bottom of the denitrification tank 1, and improves the overall sewage treatment effect in the denitrification tank 1.

[0055] Therefore, the utility model accelerates the flow mixing of the sewage and the nitration liquid in the denitrification tank, improves the denitrification treatment effect of the sewage in the denitrification tank; at the same time, the water distribution speed of the nitration liquid reflux is improved, and the mixing speed of the sewage and the nitration liquid in the denitrification tank is accelerated.

[0056] The above-mentioned specific embodiments are only the preferred embodiments of the utility model, and are not intended to limit the specific implementation range of the utility model. Any equivalent changes made according to the shape and structure of the utility model should be included in the protection scope of the utility model.

Claims

1. A nitrification liquid reflux arrangement comprising a denitrification tank, characterized in that, The water distribution pipe network is provided with a water distribution unit, the water distribution unit comprises a Venturi tube and a reflection guide plate arranged at the bottom of the denitrification tank, one end of the Venturi tube is communicated with the water distribution pipe network, and the other end is connected with an acceleration pipe, and the outlet end of the acceleration pipe faces the reflection guide plate.

2. A nitration liquid reflux arrangement according to claim 1, characterised in that, The reflection guide plate comprises an inclined surface arranged obliquely upward, and the outlet end of the acceleration pipe cooperates with the inclined surface of the reflection guide plate.

3. A nitration liquid reflux arrangement according to claim 2, characterised in that, The suction pipe is connected with the converging section of the Venturi tube, and the suction pipe is communicated with the Venturi tube.

4. A nitration liquid reflux arrangement according to claim 1 or 2 or 3, characterised in that, The water distribution pipe network comprises a plurality of water distribution branch pipes which are arranged in parallel at the bottom of the denitrification tank, and the Venturi tubes are uniformly arranged on each water distribution branch pipe.

5. A nitration liquid reflux arrangement according to claim 1 or 2 or 3, characterised in that, The number of the reflection guide plates is multiple, and the multiple reflection guide plates are arranged in parallel at the bottom of the denitrification tank.

6. A nitration liquid reflux arrangement according to claim 1 or 2 or 3, characterised in that, The cross-sectional area of the outlet end of the acceleration pipe is smaller than that of the inlet end of the acceleration pipe.

7. A nitration liquid reflux arrangement according to claim 3, characterised in that, The Venturi tube and the acceleration pipe are arranged horizontally, and the suction pipe is arranged vertically on the Venturi tube.

8. A nitration liquid reflux arrangement according to claim 1 or 2 or 3, characterised in that, The Venturi tube is threadedly connected with the water distribution pipe network.

9. A nitration liquid reflux arrangement according to claim 1 or 2 or 3, characterised in that, The water distribution branch pipe is arranged in parallel with the length direction of the reflection guide plate.

10. A nitration liquid reflux arrangement according to claim 1 or 2 or 3, characterised in that, The water distribution pipe network is supported on the bottom of the denitrification tank by a support pier.

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