CN103351043B - Vortex-type mixing sedimentation integrated reactor - Google Patents

Abstract

The invention discloses a vortex-type mixed-sedimentation integrated reactor, which is composed of a first column connected to each other, a shrinking cone, an expanding cone, and a second column, or the second column is connected to the sedimentation through a deflector district. The water flow enters the first cylinder tangentially, and flows downward while rotating. In the shrinking vertebral body, due to the smaller cross-section, the water flow rate increases. Entrainment, a larger recirculation zone appears near the wall of the expanded vertebral body and the second cylinder, generating negative pressure. During this process, the drug moves with the water flow, and the contact effect with the water flow is excellent, which can reduce the waste of drugs , reducing the dosage. The water flow through the second column part has an extremely low flow rate, which meets the requirements of entering the sedimentation tank. No mechanical stirring equipment is used, which reduces energy consumption and maintenance difficulty, and saves operating and maintenance costs.

Description

A vortex-type mixed-sedimentation integrated reactor

technical field

The invention relates to a reactor for water treatment, in particular to a vortex-type mixed-sedimentation integrated reactor for treating waste water with medicine. Not only can the mixing effect and precipitation effect of medicine and water be more effectively enhanced, but also no electric equipment is used, which reduces energy consumption.

Background technique

In the process of water purification, there are many processes to chemically react chemicals with impurities or pollutants in water by adding drugs, involving sewage treatment and regeneration, industrial wastewater treatment and reuse, circulating cooling water treatment, drinking water treatment, special industries Water and wastewater treatment, chemical industry, etc. The removal efficiency of these water treatment processes often depends on the mixing and separation effects of chemicals and target pollutants or impurities, and the clarifier process and coagulation sedimentation process are mainly used.

The clarifier process is a device that integrates the three processes of mixing, reaction of water and chemicals, and separation of flocs and water. It mainly includes mechanical stirring clarifier, hydraulic circulation clarifier, suspension clarifier, pulse clarifier. At present, the most widely used is the mechanically stirred clarifier. The mechanical agitation clarifier process is to use machinery to lift and stir the water to promote the circulation of sludge, and to make the solid impurities in the water contact with the formed sludge and flocculate, thereby achieving the effect of separation and precipitation. Its working principle is as follows: the raw water after dosing and mixing enters the first reaction chamber, contacts and reacts with the circulating sludge several times larger than the raw water under the agitation of the blades, and then is lifted to the second reaction chamber by the impeller to continue the reaction. into larger flocs, and then enter the separation chamber through the diversion chamber for sedimentation and separation. The working principle of the hydraulic circulation clarifier is basically the same as that of the mechanical agitation clarifier. The difference is that it does not use machinery but uses hydraulic power to mix and achieve sludge circulation under the action of the water ejector.

The coagulation-sedimentation process includes a coagulation process and a precipitation process. The coagulation process includes mixing and flocculation. The mixing process mainly uses a tubular static mixer to mix the coagulant and raw water, and then enters the flocculation tank. The flocculation process refers to the process of adding a coagulant and fully mixing the raw water, and under the action of the water flow, the micro flocs contact and collide with each other to form larger flocs. The flocculation tank is mainly divided into clapboard flocculation, folding plate flocculation, grid flocculation and mechanical flocculation. Sedimentation tanks are mainly divided into flat flow sedimentation tanks, vertical flow sedimentation tanks, radial flow sedimentation tanks, and inclined tube (slope plate) sedimentation tanks. Radial flow sedimentation tanks and inclined tube sedimentation tanks are the most widely used at present. The radial flow sedimentation tank is mostly circular, and the bottom of the tank is inclined. The water flows from the center to the periphery, and the flow rate gradually decreases. The inclined tube sedimentation tank is divided into a series of shallow sedimentation layers by using inclined parallel pipes or parallel pipes in the sedimentation area of the horizontal flow or vertical flow sedimentation tank, and the treated and settled sediments move with each other in each shallow sedimentation layer and separated.

At present, both the coagulation sedimentation process and the mechanical stirring clarifier process require mechanical stirring equipment, which has the disadvantages of large power consumption, high operating costs, and difficult maintenance.

Contents of the invention

In view of the defects or deficiencies in the above-mentioned prior art, the object of the present invention is to provide a vortex-type mixed-sedimentation integrated reactor, which adopts a mixed-sedimentation tank in a hydraulic mixing mode, which is different from a general mechanical agitation clarifier And the hydraulic circulation clarifier, without using any mechanical stirring equipment or water ejector, fully utilizes the gravity and initial flow velocity of the water flow, so that the water and coagulant generate vortex and reflux inside the reactor, and fully contact with flocculation, thus improving the chemical efficiency. The mixing effect reduces the use of mixing equipment, reduces energy consumption, reduces operation and maintenance costs, and makes maintenance easy.

For realizing above-mentioned task, the present invention adopts following technical solution:

A vortex mixing reactor is characterized in that it is composed of a first cylinder connected to each other, a contraction cone, an expansion cone, and a second cylinder, and a throat is formed between the contraction cone and the expansion cone. There is a water inlet pipe on the first column, the top of the first column has a drug inlet and an observation and sampling port, and the lower part of the second column is provided with a water outlet, which is mainly used for the coagulation process; where:

The height-dimension ratio of the first cylinder, shrinking vertebral body, expanding vertebral body, and second cylinder is 3:5:1:10, and the diameter ratio of the first cylinder, throat, and second cylinder is 15:1: 5. The angle of contraction cone is 46.97°, and the angle of expansion cone is 30.96°.

Another technical solution of the present invention is:

A vortex-type mixed-sedimentation integrated reactor, characterized in that it is composed of a first column connected to each other, a contraction cone, an expansion cone, a second column, a deflector and a settling area, and the contraction cone and the expansion A throat is formed between the vertebral bodies, and a water inlet pipe is provided on the first column. The top of the first column has a drug inlet and an observation and sampling port. The second column is connected to the sedimentation area through a deflector. Compared with the above-mentioned The vortex mixing reactor is mainly characterized by the addition of a sedimentation zone after the mixing zone, and is mainly used for the coagulation and sedimentation process; among them:

The height-dimension ratio of the first cylinder, shrinking vertebral body, expanding vertebral body, and second cylinder is 3:5:1:10, and the diameter ratio of the first cylinder, throat, and second cylinder is 15:1: 5. The angle of contraction cone is 46.97°, and the angle of expansion cone is 30.96°;

An annular sump is arranged on the settling area, an outlet pipe is arranged under the annular sump, and a mud bucket and a mud discharge pipe are arranged below the settling area.

The integrated vortex mixing and sedimentation reactor of the present invention can be used in all chemical and other fields involving the mixing or mixing and separation of liquids and medicaments, liquids and liquids. Compared with the existing technology at home and abroad, it has the following advantages:

1. The structure is simple. The integrated vortex mixing and sedimentation reactor is divided into two parts: the vortex mixing area and the sedimentation area, which adopts hydraulic mixing mode and does not use mechanical stirring.

2. Backflow occurs in the mixing zone. The water flow enters water tangentially from the first cylinder, forming a vortex flow, and flows downward while rotating. When the water flows to the throat, due to the sharp reduction of the cross-section, the water flows into the expansion section at a large vertical downward speed. Due to the sudden increase in the cross-section, the expansion section is entrained by the water longitudinal jet, and the local flow below the throat is very complicated, forming A very strong eddy current and turbulent flow zone are formed, the velocity gradient is large, and a large recirculation zone appears near the wall.

3. The water outlet speed in the mixing zone is small, and the mixing time is shorter than that of conventional flocculation tanks. When entering the sedimentation area from the mixing area, the water flow velocity is extremely small, which meets the speed required by the sedimentation tank. The water flow can be fully mixed with the medicine under the action of the vortex, which reduces the mixing time.

4. The coagulation effect is good and the dosage of medicine is reduced. The vortex-type mixed-sedimentation integrated reactor uses the principle of vortex to fully mix the drug with water, and the drug is fully contacted and flocculated in the vortex mixing area with the water flow, which reduces the dosage of the drug and saves the cost of the drug.

5. Water enters the siphon. The vortex-type mixed-sedimentation integrated reactor is connected to the high-level water tank in front, and the water intake is controlled by a siphon. The bell mouth of the siphon is set at the lowest water level of the high-level water tank. At the lowest water level, the siphon is destroyed and the water supply is stopped. The use of siphon to transport fluid does not require any external power. The combination of siphon and high-level water tank can moderately adjust the water volume and water flow rate. Yes, the reactor can be operated continuously or intermittently.

6. The vortex-type mixed-sedimentation integrated reactor can be applied to different occasions. Where there is a sedimentation tank, the vortex mixing reactor can be used alone as a dosing coagulation tank; where the water quality is not high, the vortex mixing and sedimentation integrated reactor can be used to directly treat sewage or waste water.

7. It is easy to manage and maintain, and the operation cost is extremely low. There is no mechanical stirring equipment, which not only saves equipment maintenance costs, reduces maintenance and management difficulties, but also saves energy consumption. The investment cost of the equipment is small, and the market popularization and application prospect is broad.

Description of drawings

Fig. 1 is a schematic structural view of the vortex mixing reactor of the present invention.

The marks in the figure represent respectively: 1. water inlet pipe, 2. first cylinder, 3. contraction vertebral body, 4. expansion vertebral body, 5. second cylinder body, 6. water outlet, 11. drug inlet pipe, 12 , Observe the sampling port.

Fig. 2 is a schematic diagram of the overall structure of the vortex-type mixed-sedimentation integrated reactor of the present invention. Wherein, after the mixed liquid passes through the water outlet of the vortex mixing reactor in Fig. 1, it passes through the circular hole on the outer wall of the vortex mixing reactor, and enters the precipitation area through the deflector.

FIG. 3 is a top view of FIG. 2 .

The marks in the figure represent respectively: 1, water inlet pipe, 2, first cylinder, 3, shrinking vertebral body, 4, expanding vertebral body, 5, second cylinder, 6', round hole, 7, mud bucket, 8 . Sedimentation area, 9. Annular sump, 10. Outlet pipe, 11. Drug inlet pipe, 12. Observation and sampling port, 13. Mud discharge pipe, 14. Baffle plate.

Fig. 4 is a trace diagram of the drug in the 12.3L vortex mixed-sedimentation integrated reactor simulated by FLUENT in Example 1 over time. The trajectory of the drug and the water flow in this figure is consistent, that is, the partial backflow area generated at the lower end of the throat not only prolongs the residence time of the drug and the water flow, increases the mixing time of the drug and the water flow, but also strengthens the mixing effect of vortex and turbulent flow, improving mixed effect.

Fig. 5 is a pressure cloud diagram of the 12.3L vortex mixed-sedimentation integrated reactor simulated by FLUENT in Example 1. In this figure, a negative pressure area is generated at the lower end of the throat, so that the water in this area will generate near-wall backflow.

Fig. 6 is the velocity vector diagram of water in the 12.3L vortex mixed-sedimentation integrated reactor simulated by FLUENT in Example 1. This figure mainly expresses the trajectory of water flow.

Fig. 7 is a diagram of the turbulent dissipation rate at the outlet of the 12.3L vortex mixed-sedimentation integrated reactor simulated by FLUENT in Example 1. It can be seen from λ ₀ =(υ ³ /ε) ^1/4 that when λ ₀ is closer to the particle diameter, it means that the collision between particles is stronger. where υ refers to the kinematic viscosity of the fluid and ε refers to the turbulent dissipation rate.

Fig. 8 is a trace diagram of the drug in the 12.3m ³ vortex mixed-sedimentation integrated reactor simulated by FLUENT in Example 2 with time. The trajectory of the drug and the water flow in this figure is consistent, that is, the partial backflow area generated at the lower end of the throat not only prolongs the residence time of the drug and the water flow, increases the mixing time of the drug and the water flow, but also strengthens the mixing effect of vortex and turbulent flow, improving mixed effect.

Fig. 9 is the pressure contour of the 12.3m ³ vortex-type mixed-sedimentation integrated reactor simulated by FLUENT in Example 2. In this figure, a negative pressure area is generated at the lower end of the throat, so that the water in this area will generate near-wall backflow.

Fig. 10 is the velocity vector diagram of water in the 12.3m ³ vortex mixed-sedimentation integrated reactor simulated by FLUENT in Example 2. This figure mainly expresses the trajectory of water flow.

Fig. 11 is a diagram of the turbulent dissipation rate at the outlet of the 12.3m ³ vortex mixed-sedimentation integrated reactor simulated by FLUENT in Example 2. It can be seen from λ ₀ =(υ ³ /ε) ^1/4 that when λ ₀ is closer to the particle diameter, it means that the collision between particles is stronger. where υ refers to the kinematic viscosity of the fluid and ε refers to the turbulent dissipation rate.

The present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments.

Detailed ways

According to the technical scheme of the present invention, a vortex type mixing reactor is mainly composed of four parts: the first cylinder 2, the contraction cone 3, the expansion cone 4, and the second cylinder 5, which are connected to each other. The contraction cone 3 and A throat is formed between the expanded vertebral bodies 4; a water inlet pipe 1 is provided on the first cylinder 5, and the top of the first cylinder 5 has a drug inlet 11 and an observation sampling port 12;

Or enter the settling tank 8 after the second cylinder 5 through the deflector; the proportion parameters of the first cylinder 2, the contraction cone 3, the expansion cone 4, the second cylinder 5 and the throat are determined by The FLUENT software simulates and determines the optimal ratio through the drug trajectory diagram, pressure cloud diagram, turbulent intensity cloud diagram, and turbulent energy consumption cloud diagram respectively. The optimal ratio simulation diagram is: there is a reflux state in the drug trajectory diagram of the four parts of the expanded vertebral body; There is a negative pressure area in the pressure cloud map; the turbulence intensity and turbulent energy consumption at the outlet are the largest.

After the FLUENT simulation, the optimal ratio is determined according to these three evaluation indicators, and the optimal ratio of the height of the first cylinder 2, contraction cone 3, expansion cone 4, and second cylinder 5 is 3:5 : 1:10; the diameter ratio of the first cylinder 2, the throat, and the second cylinder 5 is 15:1:5; at this time, the angle of the contracted cone 3 is 46.97°, and the angle of the expanded vertebral body 4 is 30.96°; The scale of the vortex mixing reactor can be scaled proportionally with the amount of treated water; the size of the drug inlet 11 has been simulated and found that the mixing effect has nothing to do with the size of the drug inlet 11, so the commonly used size of the drug inlet is Yes; the size of water inlet 1 should be determined according to the simulation results of vortex mixing and sedimentation integrated reactors of different volumes. When the vortex mixing reactor is 41.5m ³ , the diameter of water inlet 1 should not be greater than 300mm.

The sedimentation zone 8 is in the form of a radial flow sedimentation tank, with water in the center and outlet around the periphery, and mud discharge in the form of a mud discharge pipe at the bottom. The vortex mixed-sedimentation integrated reactor adopts a tangential water inlet method for the water inlet of the reaction zone, and adopts an annular water collection tank for water outlet.

The following are examples given by the inventors.

Example 1:

Referring to Fig. 1 of the example, the present embodiment provides a specific structure of the mixing zone of a vortex mixing reactor, which consists of a first cylinder 2, a contraction cone 3, an expansion cone 4, and a second cylinder 5. One cylinder 2 is provided with a water inlet pipe 1 , the top of the first cylinder 2 has a drug inlet 11 and an observation sampling port 12 , and the lower part of the second cylinder 5 is provided with a water outlet 6 .

The vortex mixing reactor has a volume of 12.3L and is made of plexiglass. It is mainly used to treat a small amount of acid wastewater in the laboratory, and the dosed agent is magnesium hydroxide. The simulation results refer to Figure 4, Figure 5, Figure 6, and Figure 7, which are mainly the simulation results of the internal flow field of the vortex mixing reactor. The dimensions of each part of the vortex mixing reactor are as follows:

1) The diameter of the first cylinder 2 is 0.3m and the height is 0.09m;

2) The upper diameter of the contracted vertebral body 3 is 0.3m, the lower diameter is 0.02m, and the height is 0.15m;

3) The upper diameter of the expanded vertebral body 4 is 0.02m, the lower diameter is 0.1m, and the height is 0.03m;

4) The diameter of the second cylinder 5 is 0.1m and the height is 0.3m;

5) The total height of the vortex mixing reactor is 0.57m.

The mode of operation is continuous operation. Using the vortex mixing reactor made in this embodiment, the steps of the treatment method for laboratory acid wastewater are as follows:

1. According to the mixing zone of the vortex mixing reactor shown in Figure 1, a high-level water tank is connected in front of the water inlet pipe 1 to store the experimental acid wastewater used in the laboratory. The acidic wastewater enters the vortex mixing reactor tangentially from the water inlet pipe 1, and flows downward while rotating in the first column 2, generating a huge vortex. At this time, magnesium hydroxide is injected into the acidic wastewater body from the drug inlet 11 at the same time. The center is entrained by the eddy current and moves together with the water flow. When the two enter the expanded vertebral body 4 from the contracted vertebral body 3 together, they pass through the throat part formed by the contracted vertebral body 3 and the expanded vertebral body 4. Because the fluid suddenly enters the section The smaller part thus produces a great velocity downward flow. When entering the expanded vertebral body 4, due to the sudden enlargement of the cross-section, the velocity gradient is large due to the entrainment of the fluid longitudinal jet, between the expanded vertebral body 4 and the second There is a large reflux area near the wall of the second column 5, where negative pressure is generated. At this time, magnesium hydroxide and acidic wastewater will perform multiple reflux movements in this area to carry out neutralization reactions, and then the fluid is stable. The water flows out of the reactor from the water outlet 6.

2. The water inlet pipe 1 is set at the top of the first cylinder 2, tangentially enters the water, the diameter of the water inlet pipe 1 is 25mm, and the water inlet speed is controlled by a peristaltic pump. According to the flow rate and head, the pump model is WT600S, and the flow rate is 1.8 mL/min～2300mL/min, connected to a hose with a diameter of 25mm, so the pump head is YZ1×4. After connecting the 4 hoses in parallel, connect the pipe with a diameter of 25mm to enter the vortex-type mixed-sedimentation integrated reactor. The flow rate of the influent water is set to 0.2m/s, and the density of the sewage entering the reactor is set to be consistent with that of water at 20°C. The theoretical hydraulic retention time of the 12.3L vortex mixing reactor can be calculated as 125s according to the volume of the vortex mixing reactor and the water inflow. However, Figure 4 shows that the hydraulic retention time of the vortex mixing reactor has reached about 380s, so it is extended The hydraulic retention time of alkaline agent and acid wastewater also enhances the mixing effect.

3. The drug inlet 11 is located at the center of the top of the first column body 2. The diameter of the drug inlet 11 is 25 mm. The method of dosing is solid dosing. The drug to be added is magnesium hydroxide, and the particle diameter of magnesium hydroxide is 2×10-5m. The dosing speed is 3.4×10 ^-03 g/s, and the dosing speed is controlled by a peristaltic pump BJ100-2J, and the pump flow rate is 0.002-380mL/min.

4. When the vortex scale λ ₀ calculated according to the formula λ ₀ =(υ ³ /ε) ^1/4 is close to or slightly larger than the particle diameter, the reaction mixing effect is the best. The kinematic viscosity of water υ=1.0×10 ^-6 m ² ·s ^-1 , according to the example in Figure 7, we can see that the value of ε is mainly concentrated in the range of ε=1.6×10 ^-2 m ² ·s ^-1 , so, λ ₀ =9 ×10 ^-5 m, the diameter of particles close to the drug is 2×10 ^-5 m, which shows that the collision between particles is very strong, and also proves that the mixing efficiency of the vortex mixing and sedimentation integrated reactor is high.

5. It can be seen from Figures 4, 5, and 6 that a huge vortex state area is generated inside the vortex mixing reactor. It can also be seen from Figure 7 that when the vortex scale is close to the diameter of the particle, the coagulation effect is the best. Therefore, it can be judged that the effluent from the integrated vortex mixing and sedimentation reactor has been fully mixed.

6. The density of the selected drug has no effect on the simulated reaction results. Because the laboratory acid wastewater to be treated is all diluted wastewater, there is little difference between the density and water, and there is no influence on the reaction result. Since magnesium hydroxide reacts with acid without precipitation, there is no need for precipitation separation, and it can be directly discharged into the urban sewer network after neutralization.

7. Two 45° elbows are connected to the water outlet (6), which are used to connect to the municipal pipe network or the next level of treatment settings. In this embodiment, two 45° elbows are used to detect water quality and flow rate, and the elbows are connected to the water outlet tank of the laboratory.

8. The operation mode can be continuous or intermittent.

Example 2:

Referring to Figure 2 of the example, this embodiment provides a specific structure of a vortex-type mixed-sedimentation integrated reactor, which is composed of the mixing zone and the sedimentation zone 8 in Example 1. The difference is that the vortex-type mixed-sedimentation integrated reactor in Example 1 The second cylinder 5 in the mixing zone of the reactor is connected to the sedimentation zone 8 through a deflector to form an integrated structure. There is an annular sump 9 on the sedimentation area 8 and an outlet pipe 10 below the annular sump 9. In the sedimentation area The bottom of 8 has mud bucket 7 and mud discharge pipe 13.

In this example, the designed reaction time of the integrated vortex mixing and sedimentation reactor in Example 1 is 20 minutes, and the designed reaction time of the precipitation zone 8 is 1.8 hours.

The vortex mixed-sedimentation integrated reactor in this embodiment has a volume of 12.3m ³ and is mainly used to replace the mechanical agitation clarifier for coagulation and sedimentation in drinking water treatment or sewage recycling. The vortex-type mixed-sedimentation integrated reactor adopts a steel plate structure or a reinforced concrete structure, and a high-level water tank is installed in front of the vortex-type mixed-sedimentation integrated reactor, and the water outlet of the water tank adopts a siphon to discharge water. The dosing method is solid dosing or liquid dosing, and the dosing medicine is polyaluminum chloride (PAC). For the simulation results, refer to Figure 8, Figure 9, Figure 10, and Figure 11. The examples are mainly the simulation results of the flow field in the mixing zone of the reactor.

The dimensions of the various parts of the vortex-type mixed-sedimentation integrated reactor of the present embodiment are as follows:

1) The diameter of the first cylinder 2 is 3m and the height is 0.9m;

2) The upper diameter of the contracted vertebral body 3 is 3m, the lower diameter is 0.2m, and the height is 1.5m;

3) The upper diameter of the expanded vertebral body 4 is 0.2m, the lower diameter is 1m, and the height is 0.3m;

4) The diameter of the second cylinder 5 is 1m, and the height is 3m; the total height of the mixing zone is 5.7m.

The size of the sedimentation zone is:

1) The total diameter of the sedimentation zone 8 is 6m, the pool side height is 2.5m, the protection height is 0.3m, and the water surface in the sedimentation zone is 0.2m lower than the water surface in the mixing reactor;

2) The upper diameter of the mud bucket 7 is 2.5m, the lower diameter is 0.2m, and the height is 2m;

3) The height of the annular sump 9 is 0.72m;

4) The diameter of the mud discharge pipe 10 is 100mm;

5) The guide plate 14 is 0.5m away from the outer wall of the reactor, and the diameter of the circular hole 6' is 0.5m.

6) The total height of the sedimentation zone is 5.5m.

The mode of operation is intermittent operation. Using the vortex-type mixed-sedimentation integrated reactor made in this embodiment, the steps of the sewage treatment method are as follows:

1. According to the vortex-type mixed-sedimentation integrated reactor shown in Figure 1, the water flow enters the vortex-type mixed-sedimentation integrated reactor tangentially from the water inlet pipe 1, and flows downward while rotating in the first column 2, resulting in huge At this time, the medicine is injected into the center of the water body from the drug inlet 11 at the same time, and is entrained by the eddy current, and moves together with the water flow. The fluid suddenly enters the smaller part of the cross section, so it flows downward at a great speed. When it enters the expanded vertebral body 4, due to the sudden enlargement of the cross section, it is entrained by the longitudinal jet of the fluid, and the velocity gradient is large. And the near wall of the second cylinder 5 has a larger recirculation zone, where a negative pressure is generated. At this time, the medicine and water will perform multiple reflux movements in this zone, and then the fluid will smoothly exit the mixing zone. The water inlet enters the diversion area through the round hole 6', and enters the sedimentation area 8 through the deflector 14 for sedimentation. The design sedimentation time in the sedimentation area 8 is 1.8h. After sufficient precipitation, the water enters the annular sump 9, and then Enter the next treatment facility through the water outlet pipe 10. According to Figure 10, it can be seen that when entering the sedimentation zone 8, the water flow velocity in the mixing zone is extremely low, which meets the design flow velocity entering the sedimentation tank, so the sedimentation and separation effect is good.

2. The water inlet pipe 1 is arranged at the top of the first cylinder 2, connected to the siphon pipe of the high water tank in front, tangentially enters the water, the size of the water inlet pipe 1 is 100mm, and the water inlet speed is 1.5m/s. The flow is controlled by a submersible sewage pump. The pump adopts a QW submersible sewage pump, the model is QW100-100-30-15, the lift is 30m, and the flow rate is 100m ³ /h. The density of the sewage entering the integrated vortex mixing and sedimentation reactor is set to be consistent with that of water at 20°C. The theoretical hydraulic retention time of the 12.3m ³ vortex-type mixed-sedimentation integrated reactor is calculated as 1044s according to the ratio of its volume to the influent, and Figure 8 shows that the hydraulic retention time of the vortex-type mixed-sedimentation integrated reactor is 1400s, so the hydraulic retention time of the flocculant and wastewater is prolonged, and the mixing effect is also strengthened.

1. The drug inlet 11 is located at the center of the top of the first cylinder 2, the size of the drug feeding port is 25 mm, and the diameter of the polyaluminum chloride particles is 1×10 ^-4 m. The dosing speed is 0.42g/s, and the JY automatic dosing device can be used for dosing.

2. According to the formula λ ₀ = (υ ³ /ε) ^1/4 , the vortex scale λ ₀ is close to or slightly larger than the particle diameter, the reaction mixing effect is the best, and the kinematic viscosity of water υ = 1.0×10 ^{- 6} m ² ·s ^-1 , according to the example in Figure 11, it can be seen that the ε value is mainly concentrated at ε=5×10 ^-4 m ² ·s ^-1 , and the vortex scale λ ₀ =2×10 ^-4 m is calculated according to the formula, and The particle diameter of polyaluminum chloride is close to 1×10 ^-4 m, so it shows that the collision between the particles is strong and the flocculation effect is good, which proves that the mixing efficiency of the vortex mixed-sedimentation integrated reactor is good.

3. It can be seen from Figures 8, 9, and 10 that a huge vortex state is generated inside the vortex-type mixed-sedimentation integrated reactor, and it can be known from Figure 11 that the vortex scale is close to the diameter of the particle, and the coagulation effect is the best . Therefore, it can be judged that the mixing efficiency of the vortex mixing and sedimentation integrated reactor is good when the water is discharged.

4. The density of the selected drug has no effect on the simulated reaction results. Because the treatment is mainly urban domestic sewage, there is little difference between the density and water, and there is no influence on the reaction result. The water treated by the vortex-type mixed-sedimentation integrated reactor can directly enter the clear water pool.

5. Adopt continuous operation.

Claims (5)

1. A vortex-type mixing reactor, characterized in that it consists of interconnected first cylinders (2), contraction cones (3), expansion cones (4), and second cylinders (5). A throat is formed between the vertebral body (3) and the expanded vertebral body (4), a water inlet pipe (1) is provided on the first cylinder (2), and a drug inlet (11) is provided on the top of the first cylinder (2). ) and the observation sampling port (12), the lower part of the second cylinder (5) is provided with a water outlet (6); where: The height-dimension ratio of the first cylinder (2), contraction vertebral body (3), expansion vertebral body (4) and second cylinder (5) is 3:5:1:10, the first cylinder (2), The diameter ratio of the throat and the second cylinder (5) is 15:1:5, the angle of the contracting cone (3) is 46.97°, and the angle of the expanding vertebral body (4) is 30.96°. 2. A vortex-type mixed-sedimentation integrated reactor, characterized in that it consists of a first cylinder (2) connected to each other, a contraction cone (3), an expansion cone (4), and a second cylinder (5) and the sedimentation area (8), the throat is formed between the shrinking vertebral body (3) and the expanding ) has a drug inlet (11) and an observation sampling port (12), and the lower end of the second column (5) is provided with a round hole (6′), and the water flows through the deflector (14) into the sedimentation area (8 );in: The height-dimension ratio of the first cylinder (2), contraction vertebral body (3), expansion vertebral body (4) and second cylinder (5) is 3:5:1:10, the first cylinder (2), The diameter ratio of throat and second cylinder (5) is 15:1:5, the angle of contraction cone (3) is 46.97°, and the angle of expansion cone (4) is 30.96°; There is an annular sump (9) on the sedimentation area (8), an outlet pipe (10) below the annular sump (9), and a mud bucket (7) and a mud discharge pipe (13) below the sedimentation area (8). ). 3. The vortex mixing reactor according to claim 1, characterized in that, the diameter of the drug inlet (11) is 25 mm, which does not vary with the water volume; the diameter of the water inlet pipe (1) varies with the volume of treated water Different scales, but not larger than 300mm. 4. The vortex-type mixed-sedimentation integrated reactor according to claim 2, characterized in that, the diameter of the drug inlet (11) is 25mm, which does not change with the water volume; the diameter of the water inlet pipe (1) varies with The difference in the amount of treated water is scaled proportionally, but not greater than 300mm. 5. The vortex mixing reactor according to claim 1, characterized in that, the water outlet (6) is connected with two 45° elbows, which are used to connect to the municipal pipe network or the next level of treatment settings. middle.