Hard removal device integrating calcium hard granulation and magnesium hard concentration

Abstract

The invention relates to the technical field of water treatment equipment, and discloses a calcium hard granulation and magnesium hard concentration integrated hard removal device which comprises a barrel, and a water distribution area, a flow equalizing area, a medicine distribution area, a granulation area and a clear water area are sequentially arranged in the barrel from bottom to top; wherein the water distribution area and the flow equalizing area are separated by arranging a tubesheet; a plurality of water distribution ports are formed in the tubesheet, and a water inlet pipe for communicating the water distribution area with the flow equalizing area is arranged in each water distribution port; a supporting rod is fixedly arranged in each water inlet pipe by arranging a connecting block, one end of each supporting rod extends out of the corresponding water inlet pipe and extends into the flow equalizing area, a water inlet cap of an arc-shaped structure is arranged at the end, extending into the flow equalizing area, of each supporting rod, and the supporting rods are connected with the inner arc surfaces of the water inlet caps; a gap is reserved between each water inlet cap and the tubesheet as well as between each water inlet cap and the corresponding water inlet pipe; the device has the advantages that the scaling phenomenon of the water distributor and the chemical distributor is avoided, and the uniformity of water distribution and chemical distribution is ensured.

Description

Technical Field

[0001] The invention relates to a calcium hardness granulation and magnesium hardness concentration integrated hardness removal device, belonging to the technical field of water treatment equipment. Background Art

[0002] The crystallization granulation fluidized bed uses the principle of heterogeneous crystallization to enable the ions to be removed to quickly nucleate and crystallize at the heterogeneous interface, thereby achieving the purpose of efficiently removing the target ions. The crystallization granulation fluidized bed induces the ions in the liquid phase to separate from the liquid phase and crystallize on the surface of the seed crystals by adding appropriate seed particles.

[0003] The common crystallization circulation granulation fluidized bed device is mainly used for the removal of calcium hardness. It includes a cylinder, a water distribution area, a drug distribution area, a granulation area, a clear water area, a water distribution head, etc., and the water distribution device is usually arranged on the same layer. In order to prevent the seed particles from being diverted back into the water inlet cavity, the water outlet direction of the water distributor outlet hole is usually set at an angle greater than 90° and less than 180° with the water flow direction in the fluidized zone. Therefore, if there is a drug distribution hole between the outer water distributor closest to the cylinder and the cylinder, the water flowing out of the water outlet hole in the direction of the cylinder may carry the agent to flow toward the cylinder, and the agent and the hardness ions in the water will react on the cylinder to form scale. If there is no drug distribution hole between the outer water distributor closest to the cylinder and the cylinder, it is easy to cause uneven mixing of the water flow and the agent, resulting in high hardness of the outlet water and hydrolysis of the agent, and there is a problem of low utilization rate. In addition, since the water distribution device and the drug distribution device are arranged on the same layer, during the water treatment process, the particles in the cylinder are screened by hydraulic forces, and the bottom particles in the vertical direction have large particle sizes, while the top particles have small particle sizes. During the drug addition reaction process, the concentration of the bottom agent is high, the reaction is violent, and the particles grow quickly, while the concentration of the top agent is low, and the particles grow slowly. The particles in the upper and lower parts cannot circulate, and the bottom particles cannot be fluidized after growing to a certain particle size and need to be discharged, which results in a short particle discharge cycle and low seed utilization.

[0004] To solve this problem, in the prior art, there is an invention patent with Chinese patent authorization announcement number CN105502692B, which discloses a chemical crystallization circulating granulation fluidized bed water treatment device, including a cylinder, in which a water distribution area, a drug distribution area, a granulation area and a clean water area are arranged in sequence from the bottom to the top; the inner cylinder divides the granulation area into three areas, the area near the bottom of the inner cylinder is the fluidization area, the area near the top of the inner cylinder is the separation area, and the interlayer between the inner cylinder and the cylinder is the static settling area; the fluidization area is connected with the seed adding tube, and the seeds circulate between the fluidization area, the separation area and the static settling area, and the ions in the water realize chemical crystallization circulating granulation during the flow process; the fluidization area is also connected with the particle discharge tube, and the particles formed by the chemical crystallization circulating granulation settle to the bottom in the fluidization area and are finally discharged from the particle discharge tube. Although the above technical solution forms the circulation of particles by setting up multiple zones, there are still the following problems: the small particles on the top cannot cross the inner tube and enter the static settling zone before they grow to the upper edge of the inner tube. When the small particles on the top can cross the upper edge of the inner tube, the large particles on the bottom are already large, and it is difficult for the small particles to enter the bottom to form an effective circulation. At the same time, since the small particles enter the static settling zone by gravity, but the water flow direction in the static settling zone and the water flow direction in the fluidization zone are both upward, and the rising flow rate in the static settling zone is lower than the rising flow rate in the fluidization zone, this will cause the particles to be unable to fluidize and accumulate. When the subsequent water flow carries the agent into the static settling zone, the agent reacts between the accumulated particles, which will cause the particles to agglomerate into lumps.

[0005] In the prior art, there is an invention patent application with Chinese patent application publication number CN115304140A, which discloses an induced crystallization granulation fluidized bed softening water treatment device, which separates the water distribution area and the drug distribution area by setting a partition, and sets a mixed flow nozzle on the partition. The drug output by the drug distributor, the water in the water distribution area and the seeds added by the seed adding port will flow into the input port of the mixed flow nozzle, and be sprayed out in a vertical upward direction from the output port, and then sink to the bottom along the inner wall of the tank body, so as to form a circulating flow in the tank body, so as to increase the effect of fluidization and water treatment of crystallization granulation, thereby improving the uniformity of drug mixing and improving the growth rate and efficiency of crystal particles. The above scheme eliminates the inner cylinder structure to avoid scaling in the static settling area (i.e., the outer wall of the cylinder), but the mixed flow nozzle cannot spray the mixed liquid outward at 360° without dead angles, which results in the water and medicine flowing into the nearby water and medicine distribution devices in the dead angle area of ​​the cylinder, which will cause scaling of the water and medicine distributors, thereby affecting the uniformity of water and medicine distribution, and further affecting the water quality and utilization rate of the medicine. At the same time, since the magnesium hydroxide generated in the reaction process exists in flocculent form and has a slow precipitation rate, it will condense into large clumps and slowly precipitate after adding flocculants, which requires larger reactors, separators, and sedimentation tanks, which have the problems of complex equipment and large floor space. Summary of the invention

[0006] In order to solve the above problems existing in the prior art, the present invention provides an integrated hardness removal device for calcium hardness granulation and magnesium hardness concentration.

[0007] The technical solution of the present invention is as follows: A calcium hardness granulation and magnesium hardness concentration integrated hardness removal device comprises a cylinder, in which a water distribution area, a uniform flow area, a medicine distribution area, a granulation area and a clear water area are sequentially connected from the bottom to the top. The water distribution area and the uniform flow area are separated by a flower plate; a plurality of water distribution ports are provided on the flower plate, and the specific number and distribution of the water distribution ports on the flower plate can be determined according to actual conditions, and each water distribution port is provided with a water inlet pipe for connecting the water distribution area and the uniform flow area together, and the water inlet pipe plays the role of diversion and rectification. A support rod is fixedly arranged inside each water inlet pipe by means of a connecting block, and each support rod extends out of the corresponding water inlet pipe at the top and extends into the equal flow area. A water inlet cap with an arc-shaped structure is arranged on the end of each support rod extending into the equal flow area, and the water inlet cap is in the equal flow area. Each support rod and the water inlet cap are coaxially arranged with the corresponding water inlet pipe, and the support rod is connected to the inner arc surface of the water inlet cap. A gap is left between each water inlet cap and the flower plate and the corresponding water inlet pipe for water inlet. The water flowing from the water distribution area to the equal flow area passes through the water inlet pipe and the water inlet cap, and then enters the equal flow area evenly along the gap 360° without dead angles under the action of the flow diversion on the inner arc surface of the water inlet cap.

[0008] In order to prevent the crystal seeds and mature particles from flowing back into the water distribution area, the diameter of the water inlet cap is set to be larger than the diameter of the water inlet pipe, so that the water inlet cap can cover the upper end of the water inlet pipe close to the even flow area, thereby preventing the crystal seeds and mature particles from falling into the water inlet pipe due to gravity and then falling into the water distribution area. At the same time, the end of the water inlet pipe close to the even flow area is set to a height higher than the flower plate and not lower than the bottom opening of the water inlet cap, which can also prevent the crystal seeds or mature particles from flowing back into the water distribution area, thereby effectively preventing the crystal seeds and mature particles from flowing back into the water distribution area, so as to ensure the uniformity of the particle size distribution and the stability of the flow state in the hardness removal device.

[0009] Furthermore, the end of the medicine distribution area close to the equal flow area is provided with a variable diameter structure so that the diameter of the medicine distribution area is larger than the diameter of the equal flow area. By setting the variable diameter structure of the medicine distribution area, the time for the medicine in the medicine distribution area to diffuse into the cylinder can be extended, thereby delaying the scaling of the upper cylinder.

[0010] Furthermore, the cylinder body is also provided with a water inlet, a particle discharge port, a dosing installation port, a strong magnetic anti-scaling component, a seed crystal addition port and a water outlet; the water inlet is connected to the water distribution area, the particle discharge port is connected to the flow equalization area, the dosing installation port is connected to the dosing area, and a dosing gun for dosing is provided inside the dosing installation port; the strong magnetic anti-scaling component is provided on the outer wall of the cylinder corresponding to the granulation area, the seed crystal addition port is connected to the granulation area, and the water outlet is connected to the clean water area.

[0011] Furthermore, the dosing installation port is arranged at the position of the reducing structure of the drug distribution area, a first connecting flange is arranged on the dosing installation port, a second connecting flange is arranged on the dosing gun, the dosing gun is installed on the dosing installation port through the connection between the first connecting flange and the second connecting flange, and a plurality of drug outlet holes are also arranged on the dosing gun. Through the arrangement of the first connecting flange and the second connecting flange, the dosing gun is connected to the dosing installation hole in a pluggable and detachable manner, so that subsequent maintenance, descaling, and unblocking operations of the dosing gun can be facilitated.

[0012] Through the above-mentioned settings, the raw water can enter the water distribution area from the water inlet, and then after passing through the water inlet pipe and the water inlet cap, it can evenly enter the uniform flow area from the gap at the bottom of the water inlet cap, and then it can drive the seeds added in advance through the seed feeding port to make it fluidized. After a period of fluidization, due to the effect of hydraulic screening, the particle size of the seed particles shows a gradual distribution from large to small in the uniform flow area, the drug distribution area and the granulation area. The water flow in the uniform flow area can be further uniform before reaching the drug distribution area from the uniform flow area due to the blocking effect of the particles. The added agent can enter the drug distribution area from the drug outlet on the dosing gun and react with the hardness ions in the raw water after the uniform flow. The generated calcium carbonate will flow upward with the water and adhere to the small and medium-sized particles of the seeds on the upper part of the dosing gun, so that the upper seeds continue to grow. When they grow larger than the seeds in the uniform flow area, the seeds in the uniform flow area gradually rise to the drug distribution area and the granulation area for growth due to the effect of hydraulic screening. In this way, the flow zone is always filled with large particles, while the small particles in the upper part of the granulation zone will not remain on the upper part due to lack of growth. The particles are self-circulated due to hydraulic screening, which prolongs the particle discharge cycle, saves crystal seeds, and avoids problems such as particle bridging and agglomeration caused by adding an inner cylinder.

[0013] At the same time, since there is a flow-equalizing zone between the water distribution area and the drug distribution area, the scaling problem of the water inlet cap can be avoided, so that the uniformity of water distribution in the flow-equalizing zone will not be deteriorated due to the scaling problem of the water inlet cap. There will be no scaling in the flow-equalizing zone because there is no reaction of the agent. After the water flows from the water inlet pipe into the flow-equalizing zone, it is rectified in the flow-equalizing zone and distributed more evenly on the surface, and the direction of the water flow will be adjusted to enter the drug distribution area vertically upward. After the water flows through the drug distribution area and mixes with the agent, it gradually reacts. The variable diameter structure of the drug distribution area can change the direction of the water flow close to the side of the cylinder, thereby extending the time for the agent flowing out of the dosing hole on the outside of the dosing gun close to the cylinder to diffuse into the cylinder, so that the agent can react as completely as possible before hitting the wall, so as to delay the scaling of the upper cylinder in the drug distribution area. The strong magnetic anti-scaling component installed outside the cylinder of the granulation area can serve as the final control device. The magnetic field generated by the strong magnetic anti-scaling component can make the residual reagents and hardness ions react quickly near the cylinder to form crystal nuclei and inhibit the growth of grains, so that they are carried away by the water flow instead of being deposited on the cylinder to form scale.

[0014] Furthermore, a filtration zone is arranged between the granulation zone and the clean water zone, and the end of the filtration zone close to the granulation zone is arranged in a variable diameter structure so that the diameter of the filtration zone is larger than the diameter of the granulation zone, and a first filter material interception net and a second filter material interception net are arranged in the filtration zone, the first filter material interception net is arranged close to the clean water zone, and the second filter material interception net is arranged close to the granulation zone, and a filter material body is arranged between the first filter material interception net and the second filter material interception net.

[0015] Furthermore, the filling volume of the filter material body is set to be smaller than half of the volume of the filtration area.

[0016] Furthermore, a side-entry agitator is also provided on the cylinder, the stirring portion of the side-entry agitator is extended into the filtration area, the installation direction of the side-entry agitator is inclined downward, and the installation position of the side-entry agitator is close to the second filter material interception net.

[0017] Furthermore, the cylinder is also provided with a filter material addition port, a flocculant addition port and a backwash discharge port, the filter material addition port and the flocculant addition port are both connected to the filtration area, and the backwash discharge port is connected to the granulation area.

[0018] Furthermore, the aperture of the first filter material interception net is set to be not less than 0.3 times the size of the filter material body, and the aperture of the second filter material interception net is set to be not less than 0.5 times the size of the filter material body.

[0019] Through the above arrangement, when the hardness removal device operates normally, the water flow in the granulation area can flow upward into the filtration area, the filter material body can float in the upper half of the filtration area due to the effect of the first filter material interception net, and the lower half can be filled with the flocculant injected through the flocculant injection port. After the side-entry agitator starts working, it can drive the water rich in magnesium hydroxide flocs from the granulation area to mix, so that the magnesium hydroxide flocs condense into large flocs and are intercepted by the filter material body above. In this process, the side-entry agitator operates at a low frequency to avoid the blades from damaging the flocs. The produced water after being filtered by the filter material body can enter the clean water area and be discharged from the water outlet. When the filter material body intercepts a certain amount of magnesium hydroxide flocs, and the resistance of the filter cake layer and the filter material layer formed in the filtration area increases, the injection of flocculant is stopped, and then backwash water is injected from the water outlet. The filter material is intercepted by the second filter material interception net at the lower part of the filtration area due to gravity and water flow, and the water flow carries the concentrated magnesium hydroxide slurry at the bottom of the filter layer to be discharged from the backwash discharge port. In this process, the frequency of the side-feed agitator is increased to increase the shear force of the side-feed agitator, so that the magnesium hydroxide flocs between the filter material bodies and in the micropores of the filter material bodies can be separated from the filter material bodies, so that they can be discharged from the backwash discharge port together with the water flow, thereby restoring the filtration performance of the filter material.

[0020] The present invention has the following beneficial effects: 1. The present invention adds an equal flow area between the water distribution area and the drug distribution area, and cooperates with the arrangement of flower plates, water distribution ports, water inlet pipes, connecting blocks, support rods, water inlet caps and other structures. The design of the legless structure allows the water flowing from the water distribution area into the water inlet pipe to enter the equal flow area evenly 360° without dead angles under the action of the water inlet cap, so that the water flow can be more evenly distributed on the surface, and the direction of the water flow can be adjusted to enter the drug distribution area vertically upward, thereby avoiding the water and drug flow in the dead corner area of ​​the cylinder to collide with each other to the nearby water distribution and drug distribution devices, causing scaling of the water distributor and the drug distributor, so as to ensure the uniformity of water distribution and drug distribution. At the same time, there is no reaction of the drug in the equal flow area, so there will be no scaling, thereby being able to well avoid the scaling problem of the water inlet cap in the equal flow area, so as to ensure that the uniformity of water distribution in the equal flow area will not be deteriorated due to the scaling problem of the water inlet cap.

[0021] 2. The present invention staggers the water distribution area and the drug distribution area to change the direction of hydraulic force and the drug during the reaction, thereby avoiding scaling of the water distribution device and the nearby cylinder, and can also delay the scaling of the drug distribution device, thereby extending the service life of the hardness removal device. At the same time, the staggered arrangement of the water distribution area and the drug distribution area can also realize the utilization of small crystal seeds on the top, extend the particle discharge cycle, improve the utilization rate of the crystal seeds, and realize the non-divided self-circulation of the crystal seeds.

[0022] 3. The present invention makes the dosing gun pluggable, so that the maintenance, descaling, and unblocking of the dosing gun can be simpler. At the same time, the diameter of the drug distribution area is changed, which can extend the time for the agent to diffuse into the cylinder, thereby delaying the scaling of the upper cylinder in the drug distribution area.

[0023] 4. The present invention arranges a strong magnetic anti-scaling component outside the cylinder in the granulation area. The strong magnetic anti-scaling component can generate a magnetic field to enable the residual reagents and hardness ions to react quickly near the cylinder to form crystal nuclei and inhibit the growth of grains, thereby further ensuring that the cylinder in the granulation area does not scale and extending the operation cycle of the hardness removal device.

[0024] 5. The present invention sets a filtration zone between the granulation zone and the clean water zone. The filtration zone can concentrate the magnesium hardness in the raw water to achieve removal, so that the hardness removal device can remove calcium hardness and magnesium hardness at the same time. The filter material body arranged in conjunction can block the formed magnesium hydroxide flocs from being discharged from the water outlet. When the filter material body intercepts a certain amount of magnesium hydroxide flocs, backwash water is injected from the water outlet. The filter material is intercepted by the second filter material interception net at the lower part of the filtration zone due to gravity and water flow. The water flow can carry the concentrated magnesium hydroxide sludge at the bottom of the filter layer to be discharged from the backwash discharge port. Compared with the prior art, there is no need to add other equipment, which has the advantages of saving floor space and reducing production costs.

[0025] 6. The present invention sets the filter material body to fill less than half of the filter area, and sets a side-entry agitator, so that the filter area of ​​the hardness removal device can be automatically divided into an upper filter layer and a lower flocculation area during normal operation, so as to achieve concentrated removal of magnesium hardness in the raw water. During backwashing, the filter material body can be brought into the lower area of ​​the filter area and stirred and cleaned by the side-entry agitator, thereby extending the service life of the filter material body.

[0026] 7. The present invention arranges the first filter material interception net and the second filter material interception net densely on the top and sparsely on the bottom, so that the broken small filter materials can be discharged with the mud instead of being discharged with the produced water, so as to ensure the quality of the produced water.

[0027] 8. The present invention sets the side-inlet agitator to use different operating frequencies during normal operation and backwashing, so that the side-inlet agitator can disperse the flocculant without floccules during normal operation, and can fully clean the filter material body during backwashing. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a structural schematic diagram of the present invention; Figure 2 It is a structural schematic diagram of the dosing gun in the present invention; Figure 3 This is the enlarged view of point A; Figure 4 This is an enlarged view of point B; Figure 5 It is the AA section view; Figure 6 It is the BB cross-sectional view; Figure 7 This is the CC section view.

[0029] The reference numerals in the figure represent: 1. Cylinder; 2. Water distribution area; 3. Flow distribution area; 4. Drug distribution area; 5. Granulation area; 6. Clean water area; 7. Flower plate; 8. Water distribution port; 9. Water inlet pipe; 10. Connection block; 11. Support rod; 12. Water inlet cap; 13. Water inlet; 14. Particle discharge port; 15. Dosing installation port; 16. Strong magnetic anti-scaling component; 17. Seed injection port; 18. Water outlet; 19. Dosing gun; 20. First connecting flange; 21. Second connecting flange; 22. Drug outlet; 23. Filtration area; 24. First filter material interception net; 25. Second filter material interception net; 26. Filter material body; 27. Side-inlet agitator; 28. Filter material injection port; 29. ​​Flocculant injection port; 30. Backwash discharge port. DETAILED DESCRIPTION

[0030] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0031] Example: Please refer to Figures 1 to 7The present embodiment provides an integrated hardness removal device for calcium hardness granulation and magnesium hardness concentration, comprising a cylinder 1, in which a water distribution area 2, a uniform flow area 3, a medicine distribution area 4, a granulation area 5 and a clean water area 6 are sequentially connected from the bottom to the top. Among them, the water distribution area 2 and the uniform flow area 3 are separated by a horizontally arranged flower plate 7; a plurality of water distribution ports 8 are provided on the flower plate 7, and the specific number and distribution of the water distribution ports 8 on the flower plate 7 can be determined according to actual conditions. Each water distribution port 8 is provided with a vertically arranged water inlet pipe 9 for connecting the water distribution area 2 and the uniform flow area 3 together, and the water inlet pipe 9 is arranged with a length greater than the diameter to reduce the fluctuation and turbulence of the fluid in the water inlet pipe 9, thereby playing a role in diversion and rectification. Each water inlet pipe 9 is fixed with a vertical support rod 11 by setting a connecting block 10. Each support rod 11 extends from the top of the corresponding water inlet pipe 9 and extends into the equal flow area 3. The end of each support rod 11 extending into the equal flow area 3 is provided with a water inlet cap 12 with an arc structure. The water inlet cap 12 is in the equal flow area 3. In this embodiment, the water inlet cap 12 is a hemispherical structure. Each support rod 11 and the water inlet cap 12 are coaxially arranged with the corresponding water inlet pipe 9. The support rod 11 is connected to the inner arc surface of the water inlet cap 12. Each water inlet cap 12 has a gap between the flower plate 7 and the corresponding water inlet pipe 9 for water inlet. After the water flow from the water distribution area 2 to the equal flow area 3 passes through the water inlet pipe 9 and the water inlet cap 12, it will enter the equal flow area 3 evenly along the gap 360° without dead angles under the action of the inner arc surface of the water inlet cap 12.

[0032] In order to prevent the crystal seeds and mature particles from flowing back into the water distribution area 2, the diameter of the water inlet cap 12 is set to be larger than the diameter of the water inlet pipe 9, so that the water inlet cap 12 can block the upper end of the water inlet pipe 9 close to the side of the uniform flow area 3, thereby preventing the crystal seeds and mature particles from falling into the water inlet pipe 9 due to gravity and then falling into the water distribution area 2. At the same time, the end of the water inlet pipe 9 close to the side of the uniform flow area 3 is set to a height higher than the flower plate 7 and not lower than the bottom opening of the water inlet cap 12, which can also prevent the crystal seeds or mature particles from flowing back into the water distribution area 2, thereby effectively preventing the crystal seeds and mature particles from flowing back into the water distribution area 2, so as to ensure the uniformity of the particle size distribution and the stability of the flow state in the hardness removal device.

[0033] In this embodiment, the end of the medicine distribution area 4 close to the uniform flow area 3 is set in a variable diameter structure so that the diameter of the medicine distribution area 4 is larger than the diameter of the uniform flow area 3. By setting the variable diameter structure of the medicine distribution area 4, the time for the medicine in the medicine distribution area 4 to diffuse into the cylinder 1 can be extended, thereby delaying the scaling of the upper cylinder 1.

[0034] In this embodiment, the cylinder 1 is also provided with a water inlet 13, a particle discharge port 14, a dosing installation port 15, a strong magnetic anti-scaling component 16, a seed addition port 17 and a water outlet 18. The water inlet 13 is connected to the water distribution area 2, and the water inlet 13 is used to introduce raw water from the outside. The particle discharge port 14 is connected to the flow area 3, and the particle discharge port 14 is used to discharge particles to the outside. The dosing installation port 15 is connected to the drug distribution area 4. The number and distribution of the dosing installation ports 15 can be determined according to actual conditions. Each dosing installation port 15 is provided inside There is a dosing gun 19 for dosing, and the dosing gun 19 can perform corresponding dosing work by connecting with the dosing installation port 15. The strong magnetic anti-scaling component 16 is arranged on the outer wall of the cylinder 1 corresponding to the granulation area 5. The strong magnetic anti-scaling component 16 can generate a magnetic field and can be a permanent magnet or an electromagnetic device. The required magnetic field strength is selected according to factors such as the material and thickness of the cylinder 1. The seed adding port 17 is connected to the granulation area 5, and the seed adding port 17 is used for adding seeds. The water outlet 18 is connected to the clean water area 6, and the water outlet 18 is used to discharge produced water.

[0035] In this embodiment, each dosing installation port 15 is arranged at the position of the reducer structure of the drug distribution area 4, each dosing installation port 15 is provided with a first connecting flange 20, and a dosing gun 19 is provided with a second connecting flange 21. The dosing gun 19 can be installed on the corresponding dosing installation port 15 through the connection between the first connecting flange 20 and the second connecting flange 21. The dosing gun 19 is also provided with a plurality of drug outlet holes 22, and the number and distribution of the drug outlet holes 22 on the dosing gun 19 can be determined according to specific circumstances. Through the arrangement of the first connecting flange 20 and the second connecting flange 21, the dosing gun 19 is connected to the dosing installation hole in a pluggable and detachable manner, so that the subsequent maintenance, descaling, and unblocking of the dosing gun 19 can be facilitated.

[0036] Through the above-mentioned settings, when the hardness removal device is in use, raw water is introduced into the water inlet 13, and seeds are added through the seed adding port 17. The raw water can enter the water distribution area 2 from the water inlet 13, and then pass through the water inlet pipe 9 and the water inlet cap 12. After the water is guided, it evenly enters the flow-equalizing area 3 from the gap at the bottom edge of the water inlet cap 12, and then can drive the seeds added in advance through the seed adding port 17 to make them fluidized. After a period of fluidization, due to the effect of hydraulic screening, the particle size of the seed particles in the flow-equalizing area 3, the drug distribution area 4 and the granulation area 5 presents a gradual distribution from large to small. The water flow in the flow-equalizing area 3 can be further evened out before reaching the drug distribution area 4 from the flow-equalizing area 3 due to the blocking effect of the particles. The added agent can enter the drug distribution area 4 from the drug outlet 22 on the dosing gun 19 and react with the hardness ions in the raw water after equalization. The generated calcium carbonate will flow upward with the water and adhere to the seeds of small and medium-sized particles on the upper part of the dosing gun 19, causing the upper seeds to grow continuously. When they grow larger than the seeds in the equalization area 3, the seeds in the equalization area 3 gradually rise to the drug distribution area 4 and the granulation area 5 for growth due to the effect of hydraulic screening. In this way, the equalization area 3 is always large particles, and the small particles on the top of the granulation area 5 will not stay on the top because they have no chance to grow. The particles achieve self-circulation due to the hydraulic screening effect, which prolongs the particle discharge cycle, saves seeds, and can also avoid problems such as particle bridging and hardening caused by adding an inner tube. After the particles accumulate to a certain extent in the equalization area 3, the particles can be discharged outward through the particle discharge port 14; At the same time, since the equal flow zone 3 is separated between the water distribution area 2 and the drug distribution area 4, the scaling problem of the water inlet cap 12 can be avoided, so that the uniformity of water distribution in the equal flow zone 3 will not be deteriorated due to the scaling problem of the water inlet cap 12. There will be no scaling in the equal flow zone 3 because there is no reaction of the agent. After the water flows from the water inlet pipe 9 into the equal flow zone 3, it is rectified by the equal flow zone 3 and the surface distribution is more uniform, and the direction of the water flow will be adjusted to enter the drug distribution area 4 vertically upward. After the water flows through the drug distribution area 4 and mixes with the agent, it gradually reacts. The variable diameter structure of the drug distribution area 4 can change the direction of the water flow near the side of the cylinder 1, thereby extending the time for the agent flowing out of the drug dosing hole near the cylinder 1 on the outside of the dosing gun 19 to diffuse to the cylinder 1, so that the agent can react as completely as possible before hitting the wall, so as to delay the scaling of the cylinder 1 on the upper part of the drug distribution area 4. The strong magnetic anti-scaling component 16 outside the cylinder 1 of the granulation zone 5 can be used as the final control device. The magnetic field generated by the strong magnetic anti-scaling component 16 can make the residual reagents and hardness ions react quickly near the cylinder 1 to form crystal nuclei, and inhibit the growth of crystal grains, so that they are carried away by the water flow instead of being deposited on the cylinder 1 to form scale. The raw water passes through the water distribution area 2, the flow equalization area 3, the drug distribution area 4 and the granulation area 5, and finally enters the clean water area 6. The water entering the clean water area 6 is the produced water with calcium hardness removed, and the produced water can be discharged to the outside through the water outlet 18.

[0037] In order to remove magnesium hardness in the raw water, in the present embodiment, a filtration zone 23 is further arranged between the granulation zone 5 and the clean water zone 6. The end of the filtration zone 23 close to the granulation zone 5 is arranged in a variable diameter structure so that the diameter of the filtration zone 23 is larger than the diameter of the granulation zone 5. A first filter material interception net 24 and a second filter material interception net 25 are arranged in the filtration zone 23. The first filter material interception net 24 is arranged close to the clean water zone 6, and the second filter material interception net 25 is arranged close to the granulation zone 5. A filter material body 26 is arranged between the first filter material interception net 24 and the second filter material interception net 25. In this embodiment, the size of a single filter material of the filter material body 26 is less than 1 cm square, so as to facilitate stirring. At the same time, the true density of the filter material body 26 is close to 1t / m³, so that it can be suspended in water, and can also float up and down with the water flow, so as to realize that the filter area 23 of the hardness removal device can be automatically divided into an upper filter layer and a lower flocculation area during normal operation. The filter material body 26 is an internal porous material, the pore size is selected to be 5~30μm, the filtration accuracy should reach 5μm, and the porosity is selected to be greater than 0.8, so as to have a greater flux than the porosity of 0.5 of the conventional sand filter. Therefore, compared with the filtration flow rate of less than 20m / h of the conventional sand filter, the filtration flow rate of the filter area 23 of the hardness removal device can reach 40~80m / h. Therefore, it is necessary to set the end of the filter area 23 close to the granulation area 5 side with a variable diameter to adjust the rising flow rate of the water flow entering the filter area 23.

[0038] In order to remove calcium hardness and magnesium hardness, in this embodiment, the reagents include Na2CO3, NaOH, etc. Na2CO3 can react with calcium ions to generate calcium carbonate precipitation, which aggregates on the surface of the seed crystal and grows into large particles, and NaOH can react with magnesium ions to generate magnesium hydroxide flocs that flow with water to the filtration area 23.

[0039] In this embodiment, the filling volume of the filter material body 26 is set to be smaller than half of the volume of the filter area 23 .

[0040] In this embodiment, a side-entry agitator 27 is also provided on the cylinder 1, and the agitation part of the side-entry agitator is extended into the filter area 23, and the installation position of the side-entry agitator 27 is close to the second filter material interception net 25. The cylinder 1 is also provided with a filter material addition port 28, a flocculant addition port 29 and a backwash discharge port 30, and the filter material addition port 28 and the flocculant addition port 29 are both connected to the filter area 23, wherein the flocculant addition port 29 is close to the second filter material interception net 25, the filter material addition port 28 is used for the outside to supplement the filter material body 26 into the filter area 23, the flocculant addition port 29 is used for the outside to add flocculants into the filter, and the backwash discharge port 30 is connected to the granulation area 5, and the backwash discharge port 30 is used to discharge the corresponding sewage sludge during the subsequent backwashing.

[0041] Through the above arrangement, when the hardness removal device is operating normally, the water flow in the granulation area 5 can flow upward into the filter area 23. At this time, the water flowing into the filter area 23 is the water that needs to remove magnesium hardness, that is, the water rich in magnesium hydroxide flocs. The filter material body 26 can float on the upper half of the filter area 23 due to the action of the first filter material interception net 24, and the lower half can be filled with the flocculant injected through the flocculant injection port 29. After the side-entry agitator 27 starts working, it can drive and mix with the water rich in magnesium hydroxide flocs from the granulation area 5, so that the magnesium hydroxide flocs are condensed into large flocs under the action of the flocculant and intercepted by the filter material body 26 above. In this process, the side-entry agitator 27 operates at a low frequency to ensure that the edge linear speed of the blade is less than 0.5m / s, and the flocculant is dispersed so that it can be fully mixed with the magnesium hydroxide flocs to avoid the blade from destroying the flocs. The produced water filtered by the filter material body 26 can enter the clean water area 6 and be discharged from the water outlet 18. When the amount of magnesium hydroxide flocs intercepted by the filter material body 26 reaches a certain amount, and the resistance of the filter cake layer and the filter material layer formed in the filter area 23 increases, the injection of flocculant is stopped, and then backwash water is injected from the water outlet 18. The filter material is intercepted by the second filter material interception net 25 at the lower part of the filter area 23 due to gravity and water flow, and the water flow carries the concentrated magnesium hydroxide slurry at the bottom of the filter layer to be discharged outward from the backwash discharge port 30. In this process, the frequency of the side-entry agitator 27 is increased so that the linear speed of the blade edge is greater than 10m / s to increase the shear force of the side-entry agitator 27, so that the magnesium hydroxide flocs between the filter material bodies 26 and in the micropores of the filter material bodies 26 can be separated from the filter material bodies 26, so that they can be discharged outward from the backwash discharge port 30 together with the water flow, thereby restoring the filtering performance of the filter material.

[0042] In this embodiment, the aperture of the first filter material interception net 24 is set to be not less than 0.3 times the size of the filter material body 26, and the aperture of the second filter material interception net 25 is set to be not less than 0.5 times the size of the filter material body 26. Through the above-mentioned setting, when the size of the filter material body 26 that is broken during backwashing is smaller than 0.5 times the original size of the filter material body 26, it will be discharged with the backwash water, especially fine particles are easier to discharge, and the larger broken particles that are not discharged during normal operation will be intercepted by the large particle filter material and the first filter material interception net 24 and will not escape. In actual use, the aperture of the first filter material interception net 24 and the second filter material interception net 25 and the multiple of the size of the filter material body 26 can be adjusted according to demand. After the hardness removal device has been running for a period of time, the filter material body 26 can be supplemented through the filter material addition port 28.

[0043] In this embodiment, the installation direction of the side-entry agitator 27 is inclined downward, so that when it is running, the blade can drive the flocculant to move downward, so that the flocculant can be mixed more evenly with the magnesium hydroxide flocs in the rising water flow from the granulation area 5, and the high-concentration flocs in the bottom of the filter layer formed by the filter material body 26 above the blade will also be driven by the blade and mixed with the magnesium hydroxide flocs from the granulation area 5 to form a floc magnesium mud cycle, and the flocculation effect is better. When backwashing, the filter material body 26 will also form a cycle driven by the side-entry agitator 27, and the flocs separated from the filter material body 26 will also be more easily carried away by the backwash water flowing downward to leave the filter area 23, thereby improving the backwash effect and restoring the filtering performance of the filter material body 26 better.

[0044] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A calcium hardness granulation and magnesium hardness concentration integrated hardness removal device, comprising a cylinder (1), characterized in that: The cylinder (1) is provided with a water distribution area (2), a flow distribution area (3), a medicine distribution area (4), a granulation area (5) and a water purification area (6) in sequence from the bottom to the top; The water distribution area (2) and the uniform flow area (3) are separated by a flower plate (7); a plurality of water distribution ports (8) are provided on the flower plate (7); a water inlet pipe (9) for connecting the water distribution area (2) and the uniform flow area (3) is provided in each water distribution port (8); a support rod (11) is fixedly provided inside each water inlet pipe (9) by means of a connecting block (10); one end of each support rod (11) extends out of the water inlet pipe (9) and extends into the uniform flow area (3); an arc-shaped water inlet cap (12) is provided on the end of each support rod (11) extending into the uniform flow area (3); the support rod (11) is connected to the inner arc surface of the water inlet cap (12); and a gap is left between each water inlet cap (12) and the flower plate (7) and the corresponding water inlet pipe (9).

2. The integrated calcium hardness granulation and magnesium hardness concentration and hardness removal device according to claim 1 is characterized in that: The support rod (11) and the water inlet cap (12) are both coaxially arranged with the water inlet pipe (9); the diameter of the water inlet cap (12) is larger than the diameter of the water inlet pipe (9); and the end of the water inlet pipe (9) close to the flow-averaging area (3) is arranged at a height higher than the flower plate (7) and not lower than the bottom opening of the water inlet cap (12).

3. The integrated calcium hardness granulation and magnesium hardness concentration and hardness removal device according to claim 1 is characterized in that: The end of the medicine distribution area (4) close to the flow equalization area (3) is arranged in a variable diameter structure so that the diameter of the medicine distribution area (4) is larger than the diameter of the flow equalization area (3).

4. The integrated calcium hardness granulation and magnesium hardness concentration and hardness removal device according to claim 3 is characterized in that: The cylinder (1) is also provided with a water inlet (13), a particle discharge port (14), a dosing installation port (15), a strong magnetic anti-scaling component (16), a seed crystal addition port (17) and a water outlet (18); the water inlet (13) is connected to the water distribution area (2); the particle discharge port (14) is connected to the flow equalization area (3); the dosing installation port (15) is connected to the dosing area (4); a dosing gun (19) for dosing is provided inside the dosing installation port (15); the strong magnetic anti-scaling component (16) is provided on the outer wall of the cylinder (1) corresponding to the granulation area (5); the seed crystal addition port (17) is connected to the granulation area (5); and the water outlet (18) is connected to the clean water area (6).

5. The integrated calcium hardness granulation and magnesium hardness concentration and hardness removal device according to claim 4 is characterized in that: The dosing installation port (15) is arranged at the position of the variable diameter structure of the drug distribution area (4), the dosing installation port (15) is provided with a first connecting flange (20), the dosing gun (19) is provided with a second connecting flange (21), the dosing gun (19) is installed on the dosing installation port (15) through the connection between the first connecting flange (20) and the second connecting flange (21), and the dosing gun (19) is also provided with a plurality of drug outlet holes (22).

6. The integrated calcium hardness granulation and magnesium hardness concentration and hardness removal device according to claim 1 is characterized in that: A filtering area (23) is further provided between the granulation area (5) and the clean water area (6); the end of the filtering area (23) close to the granulation area (5) is provided with a variable diameter structure so that the diameter of the filtering area (23) is larger than the diameter of the granulation area (5); a first filter material interception net (24) and a second filter material interception net (25) are provided in the filtering area (23); the first filter material interception net (24) is provided close to the clean water area (6), and the second filter material interception net (25) is provided close to the granulation area (5); and a filter material body (26) is provided between the first filter material interception net (24) and the second filter material interception net (25).

7. The integrated calcium hardness granulation and magnesium hardness concentration and hardness removal device according to claim 6 is characterized in that: The filling volume of the filter material body (26) is set to be smaller than half the volume of the filter area (23).

8. The integrated calcium hardness granulation and magnesium hardness concentration and hardness removal device according to claim 6 is characterized by: The cylinder (1) is further provided with a side-entry agitator (27), the agitation portion of the side-entry agitator being arranged to extend into the filtering area (23), the installation direction of the side-entry agitator (27) being arranged to be inclined downward, and the installation position of the side-entry agitator (27) being arranged to be close to the second filter material interception net (25).

9. The integrated calcium hardness granulation and magnesium hardness concentration and hardness removal device according to claim 7 is characterized in that: The cylinder (1) is also provided with a filter material addition port (28), a flocculant addition port (29) and a backwash discharge port (30); the filter material addition port (28) and the flocculant addition port (29) are both connected to the filtration area (23); and the backwash discharge port (30) is connected to the granulation area (5).

10. The integrated calcium hardness granulation and magnesium hardness concentration and hardness removal device according to claim 9 is characterized in that: The aperture of the first filter material interception net (24) is set to be no less than 0.3 times the size of the filter material body (26), and the aperture of the second filter material interception net (25) is set to be no less than 0.5 times the size of the filter material body (26).

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