CN114733376A - Mixing and stirring device and mixing method for feedwater treatment - Google Patents

Abstract

The invention provides a mixing and stirring device and a mixing method for water supply treatment, wherein the mixing and stirring device comprises a driving piece, a mixer, a transmission shaft, a first stirring blade, a second stirring blade and a dosing pipe, wherein the driving piece is connected with the top end of the transmission shaft; the first stirring blade is fixedly arranged at the upper part of the transmission shaft, and the second stirring blade is fixedly arranged at the lower part of the transmission shaft; the mixer comprises a shell with openings at two ends and a filter plate, and the filter plate is arranged at the bottom end of the shell; the mixer is sleeved on the transmission shaft and is fixedly connected with the wall of the mixing pool; the first stirring blade is positioned in the mixer; the medicine outlet end of the medicine adding pipe is opposite to the top opening of the mixer. According to the mixing and stirring device and the mixing method for water supply treatment, provided by the invention, the water inlet and outlet positions can be freely arranged according to the water inlet direction and the flow state of the downstream coagulation reaction area, so that the full dissolution of the medicament can be realized, the short-flow phenomenon can be avoided, and the rapid mixing of the inlet water and the medicament under the mechanical stirring of the mixing area can be realized.

Description

Mixing and stirring device and mixing method for feedwater treatment

Technical Field

The invention belongs to the technical field of feedwater treatment, and particularly relates to a mixing and stirring device and a mixing method for feedwater treatment.

Background

The coagulation reaction sedimentation tank for water supply treatment mainly comprises a mixing zone, a coagulation reaction zone, a plug flow zone, a pre-sedimentation zone and a sedimentation zone, wherein the mixing zone is the first procedure of the coagulation reaction sedimentation tank and has larger influence on the following four procedures. The mixing in the mixing zone is the process of quickly mixing the coagulant with the inlet water, and the inlet water and the medicament are quickly mixed under the mechanical stirring in the mixing zone.

The mixing area has two flow states, the first one is that the upstream water enters from the bottom of the pool and the upper end exits, namely the flow state of 'bottom-in-top-out', and the dosing point is arranged at the position of the lower part of the impeller of the stirring machine, which is close to the water inlet. The second flow state is that the upstream water enters from the upper part of the pool and the lower end of the pool discharges water, namely the flow state of 'upper inlet and lower outlet', and the dosing point is arranged at the upper part of the mixing area. Specifically, which mode is adopted to be adjusted according to the water inlet direction and the flow state of the downstream coagulation reaction area, on the premise that the short-flow phenomenon is avoided, otherwise, the medicament enters the coagulation reaction area without being fully mixed, so that the stable operation of the subsequent process is influenced. Therefore, when the dosing point is arranged at the upper part, only the flow state of 'upper inlet and lower outlet' can be adopted, and the restriction of the incoming water direction and the flow state of the downstream coagulation reaction area is simultaneously adopted, otherwise, appropriate supporting facilities need to be adopted to solve the short flow phenomenon.

Disclosure of Invention

The technical problem to be solved by the invention is as follows: the water inlet and outlet positions can be set randomly according to the water inlet direction and the flow state of a downstream coagulation reaction zone, namely, the water inlet and outlet positions can be set to be any one flow state of upper inlet and upper outlet, lower inlet and lower outlet, upper inlet and lower outlet and lower inlet and upper outlet, the full dissolution of the medicament can be realized, the short-flow phenomenon can be avoided, and the rapid mixing of the water inlet and the medicament under the mechanical stirring of a mixing zone can be realized.

In order to solve the above technical problems, in a first aspect, an embodiment of the present invention provides a mixing and stirring device for water supply treatment, including a driving part, a mixer, a transmission shaft, a first stirring blade, a second stirring blade, and a chemical feeding pipe, where the driving part is connected to a top end of the transmission shaft and is used to drive the transmission shaft to rotate; the first stirring blade is fixedly arranged at the upper part of the transmission shaft, and the second stirring blade is fixedly arranged at the lower part of the transmission shaft; the mixer comprises a shell with openings at two ends and a filter plate, and the filter plate is arranged at the bottom end of the shell; the mixer is sleeved on the transmission shaft and is fixedly connected with the wall of the mixing pool; the first stirring blade is positioned in the mixer; the medicine outlet end of the medicine feeding pipe is opposite to the top opening of the mixer.

As a further improvement of the embodiment of the invention, the shell of the mixer is in a bell mouth shape with a large upper part and a small lower part, and the side wall of the shell is an inward convex annular cambered surface.

As a further improvement of the embodiment of the invention, the periphery of the side wall of the shell of the mixer is provided with a water inlet hole.

As a further improvement of the embodiment of the invention, the bottom height of the lowest water inlet hole is 0-200 mm above the static liquid level in the mixing tank.

As a further improvement of the embodiment of the invention, the top height of the mixer is 200-400 mm above the static liquid level in the mixing tank, and the bottom height of the mixer is below the static liquid level in the mixing tank.

As a further improvement of the embodiment of the invention, 2-3 second stirring blades are uniformly distributed on the outer circumferential surface of the transmission shaft along the circumference.

As a further improvement of the embodiment of the invention, the distance between the bottom end of the second stirring blade and the bottom of the mixing pool is 300-500 mm.

In a second aspect, an embodiment of the present invention provides a stirring method using the above mixing and stirring apparatus for feedwater treatment, including the following steps:

step 10), the water body in the mixing pool enters a mixer through a filter plate at the bottom of the mixer, and at the moment, the liquid level in the mixer is equal to the liquid level of the mixing pool in height;

step 20), starting a driving part, wherein the driving part drives a transmission shaft to rotate and drives a first stirring blade and a second stirring blade to synchronously rotate; the second stirring blade rotates to drive the fluid at the bottom of the tank to fly out towards the tank wall at a high speed, the direction of the fluid is changed after the fluid contacts the tank wall, the fluid flows upwards at the outer ring of the mixing tank, continues to move upwards due to inertia of the fluid after flowing to the liquid level, and flows inwards and downwards due to gravity and the blocking effect of the mixer after moving to a certain height; thereby generating a circulating fluid flow from bottom to top and then from top to bottom in the mixing tank;

step 30) adding a medicament into the mixer, and rotating the first stirring blade to mix the medicament with the water body in the mixer for first dilution;

step 40), allowing the mixed liquor after the first dilution to flow out of a filter plate at the bottom of the mixer, uniformly enter the central position of a mixing tank, and then move downwards under the drive of fluid from top to bottom; in the downward movement process, mixing the mixed solution after the first dilution with the water flow in the inner ring of the mixing tank, and performing second dilution;

step 50), after the mixed liquid after the second dilution reaches the bottom of the mixing tank, mixing the mixed liquid with water at the bottom of the mixing tank under the rotation action of a second stirring blade, and performing third dilution;

step 60), moving the mixed solution after the third dilution to the wall of the mixing tank, and changing the direction to move upwards after contacting the wall of the mixing tank; if the water inlet pipe is arranged at the lower part of the mixing tank, the mixed liquid after the third dilution collides with the inlet water, so that the inlet water and the mixed liquid are quickly mixed, and the fourth dilution is carried out; if the drain pipe is arranged at the lower part of the mixing pool and is opposite to the water inlet pipe, the upward moving mixed liquid prevents the inflow water from directly flowing to the drain pipe; mixing the mixed solution after the fourth dilution with outer ring water in a mixing pool in the upward movement process, and performing fifth dilution;

if the water inlet pipe is arranged at the upper part of the mixing pool, the mixed liquid after the third dilution is mixed with the water on the outer circle of the mixing pool in the upward movement process, and the fourth dilution is carried out; when the mixed liquid after the fourth dilution flows to the water inlet pipe, the mixed liquid collides with the inlet water, so that the inlet water and the mixed liquid are quickly mixed, and the fifth dilution is carried out; if the water discharge pipe is arranged at the upper part of the mixing pool and is opposite to the water inlet pipe, the upward moving mixed liquid prevents the water from flowing to the water discharge pipe directly;

and 70) after the mixed liquid after the fifth dilution flows to the liquid level, the mixed liquid continuously moves upwards due to inertia of the mixed liquid, and after the mixed liquid moves to a certain height, the mixed liquid inwards and downwards flows due to gravity and the blocking effect of the mixer, and the circulating mixing dilution is continuously carried out.

As a further improvement of the embodiment of the present invention, the step 70) specifically includes:

after flowing to the liquid level, the mixed liquid after the fifth dilution continues to move upwards due to inertia, and after moving to a certain height, the mixed liquid moves downwards and inwards due to gravity and guidance of the side wall of the mixer shell; part of the mixed liquid enters the mixer through a water inlet hole on the side wall of the shell of the mixing part, and is mixed with the newly added medicament in the mixer for dilution; the diluted mixed liquid flows out through a filter plate at the bottom of the mixer, is mixed with the mixed liquid which directly moves downwards and inwards along the side wall of the mixer shell, and moves downwards together to be circularly mixed and diluted.

Compared with the prior art, the technical scheme of the invention has the following beneficial effects: according to the mixing and stirring device and the mixing method for feedwater treatment, the transmission shaft drives the first stirring blade in the mixer and the second stirring blade at the lower part of the mixing tank to rotate, and the second stirring blade rotates, so that the fluid circularly flowing from bottom to top and then from top to bottom is generated in the mixing tank. Adding the medicament into a mixer, and rotating a first stirring blade to ensure that the newly added medicament is mixed and diluted for the first time in the mixer; the mixed and diluted mixed liquid flows out of a filter plate at the bottom end of the mixer, uniformly enters the central position in the mixing tank, then moves downwards under the drive of the fluid from top to bottom, and the mixed liquid and the water body in the inner ring in the mixing tank are mixed and diluted for the second time in the downward movement process; after the fluid after mixing and dilution reaches the bottom of the mixing pool, the fluid is mixed and diluted for the third time with the water at the bottom of the mixing pool under the action of a second stirring blade; the mixed liquid after the third dilution moves towards the wall of the mixing tank, if the water inlet pipe is arranged at the lower part of the mixing tank, the mixed liquid after the third dilution collides with the inlet water, so that the inlet water and the mixed liquid are quickly mixed, and the mixing effect is enhanced; if the drain pipe is arranged at the lower part of the mixing pool and is opposite to the water inlet pipe, the mixed liquid after the third dilution prevents the inlet water from directly flowing to the drain pipe; the mixed liquid changes the direction and moves upwards after contacting the wall of the mixing pool, and the mixed liquid and the outer ring water in the mixing pool are mixed and diluted again in the upward movement process; if the water inlet pipe is arranged at the upper part of the mixing tank, the upward moving mixed liquid collides with the inlet water, so that the inlet water and the mixed liquid are quickly mixed, and the mixing effect is enhanced; if the water discharge pipe is arranged at the upper part of the mixing pool and is opposite to the water inlet pipe, the upward moving mixed liquid prevents the water from flowing to the water discharge pipe directly; and after the mixed liquid after the fifth dilution flows to the liquid level, the mixed liquid continuously moves upwards due to inertia of the mixed liquid, and after the mixed liquid moves to a certain height, the mixed liquid flows inwards and downwards due to gravity and the blocking effect of the mixer, and the mixed liquid reaching the bottom of the mixing pool is continuously subjected to circular mixing dilution in the mixing pool. Each circulation process can be mixed and diluted for a plurality of times, so that the medicament is fully mixed with the water body and is fully dissolved in the water. By adopting the mixing stirring device and the mixing method provided by the embodiment of the invention, the water inlet and outlet positions of the mixing pool can be arbitrarily set according to the water inlet direction and the flow state of the downstream coagulation reaction zone, namely can be set to be any one flow state of upper inlet and upper outlet, lower inlet and lower outlet, upper inlet and lower outlet and lower inlet and upper outlet, and the water inlet flowing from the lower part or the upper part can be driven by the circulating fluid to flow upwards to perform circular mixing dilution and is prevented from directly flowing to the outlet in the horizontal direction, so that the rapid mixing of the inlet water and the medicament is realized, and the short-flow phenomenon is avoided. Overcomes the limitation that the prior art can only select the upper inlet and lower outlet flow state when the dosing point is arranged at the upper part.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments of the present invention will be briefly described below, and it is obvious that the drawings described below are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

Fig. 1 is a schematic structural view of a mixing and stirring apparatus for feedwater treatment according to an embodiment of the present invention.

The figure shows that: the device comprises a driving piece 1, a mixer 2, a water inlet pipe 3, a transmission shaft 4, a second stirring blade 5, a mixing pool 6, a water discharge pipe 7, a first stirring blade 8, a metering pump 9 and a dosing pipe 10.

Detailed Description

The technical scheme of the invention is explained in detail in the following with the accompanying drawings:

the following description is merely exemplary in nature and is not intended to limit the present disclosure, application, or uses. It should be understood that throughout the drawings, corresponding reference numerals indicate like or corresponding parts and features.

The embodiment of the invention provides a mixing and stirring device for feedwater treatment, which comprises a driving part 1, a mixer 2, a transmission shaft 4, a first stirring blade 8, a second stirring blade 5 and a dosing pipe 10, as shown in fig. 1. The driving piece 1 is connected with the top end of the transmission shaft 4 and is used for driving the transmission shaft 4 to rotate. The driving piece 1 is fixed on the top end of the mixing pool 6, the driving piece 1 can adopt a motor, and the motor is connected with the top end of the transmission shaft 4 through a speed reducer. The first stirring blade 8 is fixedly arranged at the upper part of the transmission shaft 4, and the second stirring blade 5 is fixedly arranged at the lower part of the transmission shaft 4. The mixer 2 includes a case having both ends open and a filter plate provided at the bottom end of the case. The mixer 2 is sleeved on the transmission shaft 4 and is in clearance fit with the transmission shaft and is fixedly connected with the wall of the mixing pool 6. The first stirring blade 8 is located inside the mixer. The medicine outlet end of the medicine adding pipe 10 is opposite to the top opening of the mixer, and the medicine adding pipe 10 is used for adding medicine into the mixer from the top opening of the mixer. The dosing pipe 10 is provided with a metering pump 9 to control the dose of the medicament entering the mixing tank 6, thereby meeting different requirements of the process. According to the volume, the field process and the structural characteristics of the mixing tank 6, the diameter, the installation inclination angle and the motor rotating speed of the second stirring blade 5 are selected to be suitable, so that the second stirring blade 5 rotates to generate enough power, the water body at the bottom of the mixing tank flows outwards and upwards, and the water body can flow inwards and downwards after exceeding a certain height of the liquid level, and good annular circulating fluid is formed.

The mixing and stirring device for feedwater treatment of the embodiment is used for adding the medicament, and the first stirring blade 8 in the mixer 2 and the second stirring blade 5 at the lower part of the mixing tank are driven to rotate by the transmission shaft 4. The medicament is added into the mixer and is mixed and diluted for the first time with the water body in the mixer under the stirring of the first stirring blade 8. The mixed liquid after mixing and diluting flows out through the filter plate at the bottom end of the mixer 2, uniformly enters the central position in the mixing tank 6, then moves downwards under the drive of the fluid from top to bottom, and the mixed liquid and the water body in the inner ring in the mixing tank perform secondary mixing and diluting in the downward movement process. Through the mixing and dilution twice, the medicament is fully and uniformly mixed and dissolved in the fluid of the inner ring, the mixing and dilution effect is further improved, and sufficient conditions are created for the third uniform mixing and dilution.

After the mixed and diluted inner ring fluid reaches the bottom of the mixing pool, the fluid and the water at the bottom of the mixing pool are mixed and diluted for the third time under the action of the second stirring blade 5. The mixed liquid after the third mixing and dilution changes direction and moves upwards after contacting the pool wall, and even if the drain pipe 7 is arranged at the lower part of the mixing pool, the mixed liquid directly enters the drain pipe 7, and the subsequent processes are not obviously influenced. If inlet tube 3 sets up in mixing the pond lower part, the mixed liquid after the dilution is mixed through the third to the upward motion carries out the fourth with the lower part is intake and mixes the dilution to drive the lower part and intake upflow, prevent lower part simultaneously and intake direct flow to the drain pipe 7 that sets up in mixing the pond lower part. And in the upward flowing process of the mixed liquid after the fourth mixing dilution, the fluid is mixed and diluted with the water body on the outer ring of the mixing pool for the fifth time. If inlet tube 3 sets up on mixing tank upper portion, the mixed liquid after the dilution of mixing for the third time mixes the dilution with mixing tank outer lane water at the in-process that rises and carries out the fourth, when the mixed liquid after the fourth mixing dilution reaches inlet tube department, carries out the fifth with upper portion intaking and mixes the dilution, prevents simultaneously that upper portion intaking directly flows to the drain pipe 7 that sets up on mixing tank upper portion. Even if the drain pipe 7 is arranged at the upper part of the mixing tank, the outflow of the fluid which has been mixed and diluted five times does not have obvious influence on the subsequent processes, thereby overcoming the defect that the water inlet pipe 3 and the drain pipe 7 cannot be arranged at the lower part and the upper part simultaneously in the prior art.

The mixed liquid flowing upwards and mixed and diluted for five times continuously exceeds the liquid level upwards under the inertia effect, and the fluid flows downwards and inwards to the bottom of the mixing pool under the action of the self gravity and the mixing piece. And in the process that the fluid flows downwards, the fluid and the water body in the inner ring of the mixing pool are mixed and diluted again. And mixing the mixture with the mixed liquid flowing out of the bottom of the mixer, and continuing the steps to form circular mixing dilution, wherein the mixing dilution is carried out for multiple times in each circular dilution process, so that the medicament is fully mixed with the water body, and the medicament is fully dissolved in the water.

And the medicament of the high concentration among the prior art directly enters into the mixing tank, through the dilution of coming water, then stirs through agitating unit, and its high concentration's medicament is taken away rapidly by agitating unit, can appear mixing inhomogeneous phenomenon, then flows through the drain pipe. If the drain pipe 7 is provided at the lower portion, a part of the high-concentration chemical liquid directly flows into the subsequent process from the drain pipe. Even if the mixture is continuously mixed and stirred and finally tends to be uniform, the medicament needs to be stirred and mixed for a long time, and in the period, the medicament continuously enters the mixing pool, and the mixed liquid continuously flows into a coagulation reaction area of the next procedure along with a drain pipe, so that the phenomenon of non-uniform mixing always exists in the mixing and stirring process.

By adopting the mixing and stirring device provided by the embodiment of the invention, the newly added medicament is mixed and diluted for the first time in the mixer 2, and is mixed and diluted for the second time in the process of flowing out from the bottom of the mixer and flowing downwards, and the volume of the water body for mixing and diluting for the second time is much larger than that of the water body for mixing and diluting for the first time, so that the mixing and diluting effect is effectively improved before the second stirring blade is used for stirring, and a more sufficient condition is further created for mixing and diluting for the third time. At the moment, the mixed liquid cannot enter the drain pipe in the inner ring fluid, reaches the bottom of the mixing pool, is mixed and diluted for the third time under the action of the second stirring blade, and is mixed and diluted for the third time to enable the medicament to be quickly and fully dissolved in water. Meanwhile, the fluid entering the drain pipe is mixed and diluted for at least three times, so that the water inlet and outlet positions can be randomly set according to the water inlet direction and the flow state of the downstream coagulation reaction zone, namely any one of the flow states of ' upper inlet and upper outlet ', ' lower inlet and lower outlet ', ' upper inlet and lower outlet ', ' inlet water flowing from the lower part or upper part can be driven by the circulating fluid to flow upwards for circular mixing and dilution, and is prevented from directly flowing to the outlet in the horizontal direction, the rapid mixing of the inlet water and the medicament is realized, and the short-flow phenomenon is avoided. Overcomes the limitation that the prior art can only select the 'top-in-bottom-out' flow state when the dosing point is arranged at the upper part.

Preferably, the housing of the mixer 2 is in a bell mouth shape with a large top and a small bottom, and the side wall of the housing is an inward convex annular cambered surface. Set the bellmouthing form of inversion to on the casing of blender 2, and the casing lateral wall is the cambered surface, has two advantages: firstly, big-end-up in the cross section of blender 2, the medicament in the blender is difficult for overflowing at rotatory in-process to guarantee that the medicament is whole to get into from the bottom filter plate and mix pond upper portion central point and put, and from the top down motion mixes with the inner circle rivers of mixing the pond, dissolve fast in the liquid of mixing the pond inner circle. Secondly, when the mixed liquid in the mixing tank 6 moves to the surface of the tank from bottom to top along the tank wall under the action of the second stirring blades 5 and the mixed liquid just moves inwards, namely towards the transmission shaft 4, the mixer 2 plays a role in guiding the flow from top to bottom and inwards, so that the mixed liquid moves inwards downwards along the arc wall, and the mixed liquid in each direction moves downwards to prevent the mixed liquid from moving towards other directions. Therefore, even if the water inlet pipe 3 and the water outlet pipe 7 of the mixing tank are both arranged on the upper part, the short flow phenomenon can not be generated, and the defect that the water inlet pipe and the water outlet pipe can not be both arranged on the upper part in the prior art is overcome. Equally, the point of adding medicine sets up on upper portion this moment, and when inlet tube 3 set up in the lower part, more can not influence the abundant dilution of medicament, mix, on the contrary, can strengthen mixing effect, can not produce the short stream phenomenon, has overcome the point of adding medicine among the prior art and has set up when upper portion, and the inlet tube should be corresponding the limitation that sets up on upper portion.

Preferably, the side wall of the shell of the mixer 2 is provided with a water inlet hole. The inlet opening has a plurality ofly, and a plurality of inlet openings are located same horizontal plane, and evenly distributed is in mixer shell a week. The center distance of each water inlet hole is 2 d-4 d, and d is the diameter of the water inlet hole. When the mixing and stirring device works, fluid is generated on the outer ring of the mixing pool 6 from bottom to top, and when the fluid flows to the liquid level, the fluid continues to move upwards due to inertia of the fluid and then moves downwards and inwards again under the guidance of the side wall of the shell of the mixer 2. In the process, the liquid outside the mixer enters the mixer 2 through the water inlet hole to be mixed with the newly added medicament in the mixer, so that the newly added medicament is diluted for the first time.

Furthermore, the bottom height of the lowest water inlet hole is higher than the static liquid level in the mixing tank, and preferably 0-200 mm higher than the static liquid level. Wherein the static liquid level is the liquid level in the mixing tank 6 when the stirring device is not started. The water inlet hole is positioned above the static liquid level, so that the fluid in the mixer cannot flow into the mixing pool from the water inlet hole to influence the external circulating water flow to enter the mixer to mix and dilute the newly added medicament.

Preferably, the top of the mixer 2 is 200-400 mm above the static liquid level in the mixing tank, and the bottom of the mixer 2 is below the static liquid level in the mixing tank. If the top height of the mixer 2 is too high from the static liquid level, the upward flowing fluid flows downward under the action of its own gravity without contacting the side wall of the casing of the mixer 2, and the strength of the flow toward the center is weakened, thereby affecting the mixing effect in the center of the mixing tank 6. If the height of the top end of the mixer 2 is too small from the static liquid level, the potential energy of the fluid flowing downwards and inwards under the flow guiding action of the side wall of the mixer shell is small because the fluid exceeds the liquid level upwards and is small, so that the mixing effect is influenced. The bottom height of the mixer 2 is below the static liquid level in the mixing pool, so that water in the mixing pool can enter the mixer through a filter plate at the bottom end of the mixer in the initial state, and the effect of mixing and diluting the newly added medicament for the first time is ensured.

Preferably, the number of the second stirring blades 5 is 2-3, and the second stirring blades are uniformly distributed on the outer circular surface of the transmission shaft 4 along the circumference. Because the quantity of second stirring vane 5 is 2 ~ 3, improves the mixed effect of third time, makes the medicine fully dissolve in aqueous, even there is the defect of position design in inlet tube and drain pipe, also can effectively reduce the production of short-flow phenomenon (the medicine at this moment dilutes basically). Thereby overcoming the limitation that the high-concentration medicament in the prior art is diluted by a single point (the water near the water inlet is diluted) only once and then is stirred and mixed, and the quick and full mixing is difficult to realize.

Preferably, the distance between the bottom end of the second stirring blade 5 and the bottom of the mixing pool is 300-500 mm. Set up above-mentioned distance, be favorable to stirring the bottom of the pool to reduce the sediment of bottom of the pool, make the medicine fully dilute, make whole pond mixed liquid even.

The work flow of the mixing and stirring device for feedwater treatment of the above preferred embodiment is as follows:

mixing stirring is the first process of high-efficient sedimentation tank technology, and the water that comes enters into mixing tank 6 through inlet tube 3, and the water in mixing tank 6 gets into in the blender 2 by the filter plate of 2 bottoms of blender, and at this moment, the liquid level height in the blender 2 is equal with the static liquid level height of mixing tank 6.

Starting driving piece 1, driving piece 1 drives transmission shaft 4 to rotate, and transmission shaft 4 drives first stirring vane 8 that is arranged in blender 2 and second stirring vane 5 synchronous revolution of mixing tank lower part. Because the diameter of the second stirring blade 5 is larger and the second stirring blade has a larger linear velocity, the liquid at the bottom of the pool is driven to fly out to the pool wall at a high speed, when the fluid contacts the pool wall, the liquid changes the direction and flows upwards at the outer ring of the mixing pool 6, and when the fluid moves to a certain height above the liquid level, the fluid moves towards the transmission shaft 4. Because the outer wall of the mixer 2 is set to be an arc shape with a large upper part and a small lower part, the fluid moves downwards and inwards along the arc wall. And after reaching the bottom of the mixing tank, the water flows upwards and outwards under the action of the second stirring blades 5, so that an up-and-down circulating water flow is formed in the mixing tank.

The metering pump 9 is started and the medicament enters the mixer 2 through the dosing tube 10.

The first stirring blade 8 rotates to stir the high concentration chemical and water in the mixer 2, so that the high concentration chemical and water are mixed and diluted for the first time to form a high concentration mixed solution.

The mixed liquid with higher concentration formed by the first dilution flows out from the filter plate at the bottom end of the mixer, uniformly enters the upper central position in the mixing tank, then flows downwards under the drive of the fluid flowing from top to bottom, and is mixed with the water body of the inner ring in the mixing tank in the downward movement process to be diluted for the second time. After the mixed liquid reaches the bottom of the mixing tank, the mixed liquid is mixed with the fluid at the bottom of the mixing tank under the action of the second stirring blade 5, and the third dilution is carried out, so that the medicament is fully dissolved in the water, and the concentration of the medicament mixed liquid is reduced again.

The mixed liquid after the third mixing and dilution moves quickly to the wall of the mixing pool 6 and changes direction to move upwards after contacting the wall of the mixing pool.

If inlet tube 3 sets up in the lower part of mixing tank 6, the mixed liquid after diluting for the third collides with into water mutually for the water intaking mixes liquid flash mixed with mixing, dilutes for the fourth time. If the drain pipe 7 is arranged at the lower part of the mixing tank, the mixed liquid prevents the inflow water from directly flowing to the drain pipe 7, and the short-flow phenomenon is avoided. Meanwhile, the main flow of the mixed liquid after the fourth mixing and dilution moves upwards, and is mixed with the outer ring water body in the mixing pool 6 in the upward movement process, so that the fifth dilution is performed.

If inlet tube 3 sets up the upper portion at mixing tank 6, the mixed liquid after the dilution of the third time mixes with mixing tank outer lane water at the in-process that rises, dilutes for the fourth time. And when the mixed liquid after the fourth dilution flows to the water inlet pipe, the mixed liquid collides with the inlet water, so that the inlet water and the mixed liquid are quickly mixed, and the fifth dilution is carried out. Meanwhile, if the drain pipe 7 is arranged at the upper part of the mixing tank, the mixed liquid prevents the inflow water from directly flowing to the drain pipe 7, and the short-flow phenomenon is avoided.

When the mixed liquid after the fifth dilution flows to the liquid level, the fluid continues to move upwards due to the inertia thereof, so that the dynamic highest liquid level is higher than the static liquid level, and when the fluid hits the mixer 2 upwards, the fluid moves downwards to the central position under the guidance of the outer wall of the mixer 2.

In the process that the fluid moves downwards and inwards under the guidance of the side wall of the shell of the mixer 2, part of the fluid enters the mixer 2 through the water inlet hole and is mixed with the fluid in the mixer and the newly added medicament, and the newly added medicament is diluted for the first time. The mixed fluid flows into the middle upper part of the mixing tank through a filter plate at the bottom of the mixer, then flows downwards to the bottom of the mixing tank, in the downward flow process, the mixed liquid after the first dilution is mixed with the water body in the inner ring of the mixing tank 6, and the new medicament is added for the second dilution. And part of the fluid flows directly downwards and inwards to the bottom of the mixing tank. In the downward flowing process, the fluid is mixed with the water body in the inner ring of the mixing pool 6 to enhance dilution. And the fluid reaching the bottom of the mixing pool continues to be circularly mixed and diluted under the action of the second stirring blade 5.

The embodiment of the invention also provides a stirring method using the mixing and stirring device for feedwater treatment, which comprises the following steps:

and step 10), the water body in the mixing pool 6 enters the mixer 2 through a filter plate at the bottom of the mixer 2, and at the moment, the liquid level in the mixer 2 is equal to the liquid level of the mixing pool 6.

And step 20), starting the driving part 1, wherein the driving part 1 drives the transmission shaft 4 to rotate and drives the first stirring blade 8 and the second stirring blade 5 to synchronously rotate. The second stirring blade 5 rotates to drive the fluid at the bottom of the tank to fly out towards the tank wall at a high speed, the direction of the fluid is changed after the fluid contacts the tank wall, the fluid flows upwards at the outer ring of the mixing tank 6, continues to move upwards due to inertia of the fluid after flowing to the liquid level, and flows inwards and downwards due to gravity and the blocking effect of the mixer 2 after moving to a certain height. Thereby creating a circulating flow of fluid from bottom to top and then from top to bottom in the mixing tank 6.

Step 30) adding the medicament into the mixer 2, and rotating the first stirring blade 8 to mix the medicament with the water in the mixer 2 for the first dilution.

And step 40), the mixed liquid after the first dilution flows out from a filter plate at the bottom of the mixer, uniformly enters the central position in the mixing tank 6, and then moves downwards under the drive of the fluid from top to bottom. In the downward movement process, the mixed liquid after the first dilution is mixed with the water flow in the inner ring of the mixing pool 6 for the second dilution.

And step 50), after the mixed liquid after the second dilution reaches the bottom of the mixing pool, mixing the mixed liquid with water at the bottom of the mixing pool 6 under the rotation action of the second stirring blade 5, and performing third dilution.

Step 60), the mixed liquid after the third dilution moves to the wall of the mixing tank 6, and changes the direction to move upwards after contacting the wall. If the inlet tube sets up in 6 lower parts of mixing tank, the mixed liquid after diluting for the third collides with into water mutually for the mixed liquid flash mixed of intaking and mixing carries out the fourth and dilutes, strengthens mixing effect. If the drain pipe is disposed at the lower portion of the mixing tank 6 opposite to the inlet pipe, the upwardly moving mixed liquid prevents the inflow water from directly flowing toward the drain pipe. And mixing the mixed solution after the fourth dilution with the water on the outer circle in the mixing pool 6 in the upward movement process, and performing the fifth dilution.

If the inlet tube sets up in 6 upper portions of mixing tank, the mixed liquid after the dilution of the third time in-process of upward movement mixes with mixing tank outer lane water, dilutes for the fourth time. When the mixed liquid after the fourth dilution flows to the water inlet pipe, the mixed liquid collides with the inlet water, so that the inlet water and the mixed liquid are quickly mixed, the fifth dilution is performed, and the mixing effect is enhanced. If the water discharge pipe is arranged at the upper part of the mixing pool and is opposite to the water inlet pipe, the mixed liquid moving upwards prevents the inflow water from flowing to the water discharge pipe directly.

And 70) after the mixed liquid after the fifth dilution flows to the liquid level, the mixed liquid continuously moves upwards due to inertia, and after the mixed liquid moves to a certain height, the mixed liquid flows inwards and downwards due to gravity and the blocking action of the mixer 2, and the mixed liquid reaching the bottom of the mixing pool continuously carries out circular mixing and dilution in the mixing pool 6.

In the mixing method for feedwater treatment of the above embodiment, the transmission shaft drives the first stirring blade located in the mixer and the second stirring blade located at the lower part of the mixing tank to rotate, and the second stirring blade rotates, so that a fluid circularly flowing from bottom to top and then from top to bottom is generated in the mixing tank. Adding the medicament into a mixer, and rotating a first stirring blade to ensure that the newly added medicament is mixed and diluted for the first time in the mixer; the mixed and diluted mixed liquid flows out of a filter plate at the bottom end of the mixer, uniformly enters the central position in the mixing tank, then moves downwards under the drive of the fluid from top to bottom, and the mixed liquid and the water body in the inner ring in the mixing tank are mixed and diluted for the second time in the downward movement process; after the mixed and diluted fluid reaches the bottom of the mixing pool, the fluid and the water at the bottom of the mixing pool are mixed and diluted for the third time under the action of a second stirring blade; the mixed liquid after the third dilution moves to the wall of the mixing pool, and the direction of the mixed liquid is changed to move upwards after contacting the wall of the mixing pool. If the water inlet pipe is arranged at the lower part of the mixing tank, the mixed liquid after the third dilution collides with the inlet water, so that the inlet water and the mixed liquid are quickly mixed, the fourth mixing dilution is carried out, and the mixing effect is enhanced; if the drain pipe is arranged at the lower part of the mixing pool and is opposite to the water inlet pipe, the upward moving mixed liquid prevents the inflow water from directly flowing to the drain pipe; carrying out fifth mixing dilution on the mixed liquid after fourth dilution and outer ring water in the mixing pool in the upward movement process; if the water inlet pipe is arranged at the upper part of the mixing pool, the mixed liquid after the third dilution is mixed and diluted for the fourth time with the water on the outer circle in the mixing pool in the upward movement process; when the mixed liquid after the fourth dilution flows to the water inlet pipe, the mixed liquid collides with the inlet water, so that the inlet water and the mixed liquid are quickly mixed, and the fifth mixing dilution is carried out, so that the mixing effect is enhanced; if the water discharge pipe is arranged at the upper part of the mixing pool and is opposite to the water inlet pipe, the upward moving mixed liquid prevents the water from flowing to the water discharge pipe directly; and after the mixed liquid after five times of dilution flows to the liquid level, the mixed liquid continuously moves upwards due to inertia, and after the mixed liquid moves to a certain height, the mixed liquid flows inwards and downwards due to gravity and the blocking effect of the mixer, and the mixed liquid reaching the bottom of the mixing pool is continuously subjected to circulating mixing dilution in the mixing pool. Each circulation process can be mixed and diluted for a plurality of times, so that the medicament is fully mixed with the water body and is fully dissolved in the water. By adopting the mixing method provided by the embodiment of the invention, the water inlet and outlet positions of the mixing pool can be arbitrarily set according to the water inlet direction and the flow state of the downstream coagulation reaction zone, namely any one of the flow states of ' upper inlet and upper outlet ', ' lower inlet and lower outlet ', ' upper inlet and lower outlet ', ' inlet water flowing from the lower part and inlet water flowing from the upper part can be driven by the circulating fluid to flow upwards for circular mixing and dilution, and are prevented from directly flowing to the outlet in the horizontal direction, so that the rapid mixing of the inlet water and the medicament is realized, and the short-flow phenomenon is avoided. No matter the water is discharged from the lower part or the upper part, the mixing and diluting processes are carried out at least three times, and the medicament with higher concentration can not directly enter the subsequent process. Overcomes the limitation that the prior art can only select the 'top-in-bottom-out' flow state when the dosing point is arranged at the upper part.

As a preferable example, the step 70) further includes:

in the process that the mixed liquid moves downwards and inwards under the guidance of the side wall of the shell of the mixing part 2, part of the mixed liquid enters the mixer through the water inlet hole in the side wall of the shell of the mixing part, and is mixed with the newly added medicament in the mixer for dilution. The diluted mixed liquid flows out through a filter plate at the bottom of the mixer, is mixed with the mixed liquid which directly moves downwards and inwards along the side wall of the shell of the mixer 2, and moves downwards together with the mixed liquid to flow to the bottom of the mixing tank.

In the process that the mixed liquid flows downwards along the side wall of the shell of the mixer 2, part of the mixed liquid enters the mixer 2 through the water inlet hole and is mixed with the newly added medicament in the mixer, so that the newly added medicament is diluted for the first time.

The above description is only for the specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims (9)

1. The mixing and stirring device for water supply treatment is characterized by comprising a driving piece (1), a mixer (2), a transmission shaft (4), a first stirring blade (8), a second stirring blade (5) and a dosing pipe (10), wherein the driving piece (1) is connected with the top end of the transmission shaft (4) and is used for driving the transmission shaft (4) to rotate; the first stirring blade (8) is fixedly arranged at the upper part of the transmission shaft (4), and the second stirring blade (5) is fixedly arranged at the lower part of the transmission shaft (4); the mixer (2) comprises a shell with openings at two ends and a filter plate, and the filter plate is arranged at the bottom end of the shell; the mixer (2) is sleeved on the transmission shaft (4) and is fixedly connected with the wall of the mixing tank (6); the first stirring blade (8) is positioned in the mixer; the medicine outlet end of the medicine adding pipe (10) is opposite to the top end opening of the mixer.

2. The mixing and stirring device as claimed in claim 1, wherein the housing of the mixer (2) is in the shape of a bell mouth with a large top and a small bottom, and the side wall of the housing is an inwardly convex annular cambered surface.

3. Mixing device according to claim 2, characterized in that the side wall of the housing of the mixer (2) is provided with water inlet holes around the circumference.

4. A mixing and stirring device as claimed in claim 3, wherein the height of the bottom end of the lowest water inlet hole is 0-200 mm above the height of the still liquid level in the mixing tank.

5. The mixing and stirring device according to claim 1, wherein the top height of the mixer (2) is 200-400 mm above the static liquid level in the mixing tank, and the bottom height of the mixer (2) is below the static liquid level in the mixing tank.

6. The mixing and stirring device of claim 1, wherein the number of the second stirring blades (5) is 2-3, and the second stirring blades are uniformly distributed on the outer circumferential surface of the transmission shaft (4) along the circumference.

7. The mixing and stirring device of claim 1, wherein the distance between the bottom end of the second stirring blade (5) and the bottom of the mixing tank is 300-500 mm.

8. A stirring method using the mixing and stirring device for feedwater treatment of any of claims 1-7, characterized by comprising the steps of:

step 10), enabling the water body in the mixing pool (6) to enter the mixer (2) through a filter plate at the bottom of the mixer (2), wherein the liquid level in the mixer (2) is equal to the liquid level of the mixing pool (6);

step 20), starting the driving part (1), wherein the driving part (1) drives the transmission shaft (4) to rotate and drives the first stirring blade (8) and the second stirring blade (5) to synchronously rotate; the second stirring blade (5) rotates to drive the fluid at the bottom of the pool to fly out towards the pool wall at a high speed, the direction of the fluid is changed after the fluid contacts the pool wall, the fluid flows upwards at the outer ring of the mixing pool (6), the fluid continues to move upwards due to inertia of the fluid after flowing to the liquid level, and the fluid flows inwards and downwards due to gravity and the blocking effect of the mixer (2) after moving to a certain height; thereby generating a circulating fluid flow from bottom to top and then from top to bottom in the mixing tank (6);

step 30) adding a medicament into the mixer (2), and rotating the first stirring blade (8) to mix the medicament with the water body in the mixer (2) for first dilution;

step 40), enabling the mixed liquor after the first dilution to flow out of a filter plate at the bottom of the mixer, uniformly entering the central position in the mixing tank (6), and then moving downwards under the drive of the fluid from top to bottom; in the downward movement process, the mixed liquor after the first dilution is mixed with the water flow in the inner ring of the mixing pool (6) for the second dilution;

step 50), after the mixed liquid after the second dilution reaches the bottom of the mixing pool, mixing the mixed liquid with water at the bottom of the mixing pool (6) under the rotation action of a second stirring blade (5) to carry out third dilution;

step 60), moving the mixed solution after the third dilution to the wall of the mixing tank (6), and changing the direction to move upwards after contacting the wall of the mixing tank; if the water inlet pipe is arranged at the lower part of the mixing tank (6), the mixed liquid after the third dilution collides with the inlet water, so that the inlet water and the mixed liquid are quickly mixed, and the fourth dilution is carried out; if the drain pipe is arranged at the lower part of the mixing pool (6) and is opposite to the water inlet pipe, the upward moving mixed liquid prevents the inflow water from directly flowing to the drain pipe; mixing the mixed solution after the fourth dilution with outer ring water in a mixing pool (6) in the upward movement process, and performing fifth dilution;

if the water inlet pipe is arranged at the upper part of the mixing pool (6), the mixed liquid after the third dilution is mixed with water on the outer circle of the mixing pool (6) in the upward movement process, and the fourth dilution is carried out; when the mixed liquid after the fourth dilution flows to the water inlet pipe, the mixed liquid collides with the inlet water, so that the inlet water and the mixed liquid are quickly mixed, and the fifth dilution is carried out; if the water discharge pipe is arranged at the upper part of the mixing pool and is opposite to the water inlet pipe, the upward moving mixed liquid prevents the water from flowing to the water discharge pipe directly;

and 70) after the mixed liquid after the fifth dilution flows to the liquid level, the mixed liquid continuously moves upwards due to inertia of the mixed liquid, and after the mixed liquid moves to a certain height, the mixed liquid flows inwards and downwards due to gravity and the blocking effect of the mixer (2), and the mixed liquid is circularly mixed and diluted.

9. The mixing method according to claim 8, characterized in that said step 70) comprises in particular:

after flowing to the liquid level, the mixed liquid after the fifth dilution continues to move upwards due to inertia, and after moving to a certain height, the mixed liquid moves downwards and inwards due to gravity and the guidance of the side wall of the shell of the mixer (2); part of the mixed liquid enters the mixer through a water inlet hole on the side wall of the shell of the mixing part, and is mixed with the newly added medicament in the mixer for dilution; the diluted mixed liquid flows out through a filter plate at the bottom of the mixer and is mixed with the mixed liquid which directly moves downwards and inwards along the side wall of the shell of the mixer (2), and the mixed liquid moves downwards together to be circularly mixed and diluted.

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