A reinforced crystallization reactor for simultaneous descaling and desilication

Abstract

The application discloses a reinforced synchronous hardening and silicon removing crystallization reactor device, a shell of which is sequentially divided into a water outlet area, a hardening removing section, a silicon removing section and a water inlet area from top to bottom; a top outlet of the water outlet area is connected with a water outlet pipe; an inner cylinder is arranged in the middle of the hardening removing section; a first alkali adding opening in the bottom side of the hardening removing section is connected with a first alkali adding distributor; a calcium removing agent adding opening in the bottom side of the hardening removing section is connected with a calcium removing agent adding distributor; a shunt function component is arranged in the hardening removing section; a second alkali adding opening in the bottom side of the silicon removing section is connected with a second alkali adding distributor; a silicon removing agent adding opening in the bottom side of the silicon removing section is connected with a silicon removing agent adding distributor; an end of a water inlet pipe is connected with a water distributor after being inserted into the water inlet area through the bottom of the water inlet area; a seed discharge opening in the top side of the water inlet area is connected with a seed discharge pipe; and the device has the characteristics of short technological process, low investment cost, high reaction efficiency and long-time stable operation.

Description

Technical Field

[0001] This invention belongs to the field of water treatment technology and relates to an enhanced synchronous hardening and silicon removal crystallization reactor device. Background Technology

[0002] The seed crystal method for hardening removal has received increasing attention in recent years due to its advantages such as high reaction efficiency and comprehensive utilization of solid products. However, in practical applications, the seed crystal method suffers from problems such as seed crystal caking and clogging of the reactor, making it difficult to operate stably for a long time. In addition, in water treatment, hardening removal is often accompanied by silicon removal. Hardening removal and silicon removal require separate reactors, resulting in a long process flow, increased investment, and increased land occupation. Developing an integrated silicon removal and hardening removal reactor with high reaction efficiency and long-term stable operation is the key to the practical application of the seed crystal method for hardening removal. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of the prior art and provide an enhanced synchronous hardening and silicon removal crystallization reactor device, which features a short process flow, low investment cost, high reaction efficiency, and the ability to operate stably for a long time.

[0004] To achieve the above objectives, the enhanced synchronous hardening and silicon removal crystallization reactor device of the present invention includes a shell, an outlet pipe, a first alkali dosing distributor, a calcium removal agent dosing distributor, a second alkali dosing distributor, a silicon removal agent dosing distributor, an inlet pipe, and a seed crystal discharge pipe.

[0005] The shell is divided into an outlet area, a hardening section, a silica removal section and an inlet area from top to bottom. The top outlet of the outlet area is connected to the outlet pipe. An inner cylinder is provided in the middle of the hardening section. The first alkali dosing port on the bottom side of the hardening section is connected to the first alkali dosing distributor. The calcium removal agent dosing port on the bottom side of the hardening section is connected to the calcium removal agent dosing distributor. A diversion function component is provided inside the hardening section.

[0006] The second alkali dosing port on the bottom side of the desiliconization section is connected to the second alkali dosing distributor. The desiliconization agent dosing port on the bottom side of the desiliconization section is connected to the desiliconization agent dosing distributor. The end of the water inlet pipe is inserted into the water inlet area through the bottom of the water inlet area and then connected to the water distributor. The seed discharge port on the top side of the water inlet area is connected to the seed discharge pipe.

[0007] A top-mounted pH measuring device and a turbidity measuring device are installed in the effluent area.

[0008] It also includes a top sampling tube, with the top sampling port on the side of the water outlet area connected to the top sampling tube.

[0009] It also includes a central sampling tube device, except that the central sampling port on the top side of the hard segment is connected to the central sampling tube device.

[0010] The central sampling port, inner cylinder, diversion functional component, calcium removal agent dosing port, and first alkali dosing port are distributed sequentially from top to bottom.

[0011] An observation hole is provided on the side of the hard section, and the observation hole is directly opposite the lower side of the inner cylinder.

[0012] The inner cylinder has a corrugated structure.

[0013] It also includes a bottom sampling tube, and the bottom sampling port on the top side of the silicon removal section is connected to the bottom sampling tube.

[0014] A bottom observation hole is provided on the side wall of the silicon removal section.

[0015] A perforated plate is installed in the water inlet area, and several anti-clogging water caps are installed on the perforated plate;

[0016] The top opening of the water distributor is equipped with a cap, and the perforated plate is located on the upper side of the water distributor.

[0017] The present invention has the following beneficial effects:

[0018] The enhanced synchronous hardening and desiliconization crystallization reactor device of this invention, in specific operation, divides the shell into an outlet zone, a hardening section, a desiliconization section, and an inlet zone from top to bottom. This ensures that the entire treatment process takes place within the shell, with the water flow direction from bottom to top, achieving both hardening and desiliconization. This avoids the need for separate reactors for hardening and desiliconization, reducing investment costs, improving reaction efficiency, and shortening the process flow. Furthermore, the hardening section of this invention features an inner cylinder in the middle, employing an inner and outer cylinder design to achieve vertical circulation of small-particle seed crystals and water, improving seed crystal utilization and internal turbulence, while simultaneously suppressing homogeneous crystallization at the bottom, preventing problems such as seed crystal caking and clogging, which hinders long-term stable operation of the reactor. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of the present invention;

[0020] Figure 2 The streamline diagram for the flow field simulation of inner cylinder 3-5;

[0021] Figure 3 This is a schematic diagram of the inner and outer cylinders.

[0022] Among them, 1-1 is the inlet pipe, 1-2 is the water distributor, 1-3 is the end cap, 1-4 is the bottom pressure measuring device, 1-5 is the perforated plate, 1-6 is the anti-clogging water cap, 1-7 is the seed crystal discharge pipe, 2-1 is the second alkali dosing distributor, 2-2 is the silicon removal agent dosing distributor, 2-3 is the reaction cylinder, 2-4 is the bottom observation hole, 2-5 is the bottom sampling pipe, 2-6 is the bottom pH measuring device, 3-1 is the first alkali dosing distributor, 3-2 is the calcium removal agent dosing distributor, 3-3 is the diversion functional component, 3-4 is the observation hole, 3-5 is the inner cylinder, 3-6 is the outer cylinder, 3-7 is the middle sampling pipe device, 4-1 is the crystal dosing pipe, 4-2 is the top sampling pipe, 4-3 is the top pH measuring device, 4-4 is the turbidity measuring device, and 4-5 is the outlet pipe. Detailed Implementation

[0023] To enable those skilled in the art to better understand the present invention, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are merely some embodiments of the present invention, not all embodiments, and are not intended to limit the scope of the present invention. Furthermore, in the following description, descriptions of well-known structures and technologies are omitted to avoid unnecessary confusion regarding the concepts disclosed in the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort should fall within the scope of protection of the present invention.

[0024] The accompanying drawings show structural schematic diagrams according to embodiments disclosed in this invention. These drawings are not drawn to scale, and some details have been enlarged for clarity, and some details may have been omitted. The shapes of the various regions and layers shown in the drawings, as well as their relative sizes and positional relationships, are merely exemplary and may deviate from reality due to manufacturing tolerances or technical limitations. Furthermore, those skilled in the art can design regions / layers with different shapes, sizes, and relative positions as needed.

[0025] refer to Figure 1 and Figure 2 The enhanced synchronous hardening and desiliconization crystallization reactor device of the present invention includes a shell, wherein the shell is divided into an outlet zone, a hardening section, a desiliconization section and an inlet zone from top to bottom. The top outlet of the outlet zone is connected to the outlet pipe 4-5. A top pH measuring device 4-3 and a turbidity measuring device 4-4 are installed in the outlet zone. The top sampling port on the side of the outlet zone is connected to the top sampling pipe 4-2. The crystal addition port on the side of the outlet zone is connected to the crystal addition pipe 4-1.

[0026] It should be noted that the combination of the first alkali dosing distributor 3-1 and the top pH measuring device 4-3 keeps the pH of the crystallizer stable within the optimal pH range for hardness removal, maintaining high hardness removal efficiency. In addition, when the turbidity of the effluent from the turbidity measuring device 4-4 increases abnormally, it is predicted that the bed height exceeds the design height and crystal seeds need to be discharged. When crystal seed particles are found when sampling from the top sampling pipe 4-2, large mature crystal seeds need to be discharged in time, and new crystal seeds are added from the crystal dosing pipe 4-1.

[0027] The hardening section is equipped with an inner cylinder 3-5. The middle sampling port on the top side of the hardening section is connected to the middle sampling tube device 3-7. An observation hole 3-4 is provided on the side of the hardening section, which is directly opposite the lower side of the inner cylinder 3-5. The first alkali dosing port on the bottom side of the hardening section is connected to the first alkali dosing distributor 3-1. The calcium removal agent dosing port on the bottom side of the hardening section is connected to the calcium removal agent dosing distributor 3-2. A diversion functional component 3-3 is provided inside the hardening section. The middle sampling port, inner cylinder 3-5, diversion functional component 3-3, calcium removal agent dosing port, and first alkali dosing port are distributed sequentially from top to bottom. The inner cylinder 3-5 has a corrugated structure, and the outer wall of the hardening section serves as the outer cylinder 3-6.

[0028] It should be noted that the first alkali dosing distributor 3-1 ensures uniform mixing of the reagent and the incoming water; the design of the inner cylinder 3-5 and the outer cylinder 3-6 enables the vertical circulation of small-particle seed crystals and water, which can improve the seed crystal utilization rate and internal turbulence, while inhibiting homogeneous crystallization at the bottom; the wave-shaped design of the inner cylinder 3-5 can enhance the turbulence of the inner cylinder 3-5; the diversion function component 3-3 increases the turbulence of the inner and outer cylinders in the transition zone between the silicon removal section and the hardening removal section, enhances the seed crystal fluidization state, and solves the problem of blockage in the inner and outer cylinder crystallization reactors; the central sampling tube device 3-7 monitors the water quality of the hardening removal effluent and the morphology of the returned seed crystal particles; and the observation hole 3-4 observes the seed crystal fluidization morphology in the transition zone.

[0029] The bottom sampling port on the top side of the desiliconization section is connected to the bottom sampling tube 2-5. The bottom pH measuring device 2-6 is connected to the top side of the desiliconization section. The bottom observation hole 2-4 is provided on the side wall in the middle of the desiliconization section. The second alkali dosing port on the bottom side of the desiliconization section is connected to the second alkali dosing distributor 2-1. The desiliconization agent dosing port on the bottom side of the desiliconization section is connected to the desiliconization agent dosing distributor 2-2.

[0030] It should be noted that the second alkali dosing distributor 2-1 and the silica removal agent dosing distributor 2-2 ensure uniform mixing of the agent with the incoming water, avoiding local high or low concentrations, reducing side reactions, and improving reaction efficiency. The first alkali dosing distributor 3-1, combined with the bottom pH measuring device 2-6, stabilizes the pH of the silica removal section within the optimal pH range for silica removal, maintaining efficient silica removal, while simultaneously converting some bicarbonate ions into carbonate ions for calcium removal, achieving simultaneous silica and calcium removal. In addition, the bottom observation hole 2-4 observes the fluidization state and morphology of the bottom seed crystals, and the bottom sampling tube 2-52-5 is used to sample and monitor the water quality of the silica removal section effluent.

[0031] A perforated plate 1-5 is installed in the water inlet zone. Several anti-clogging water caps 1-6 are installed on the perforated plate 1-5. The end of the water inlet pipe 1-1 is inserted into the water inlet zone through the bottom of the water inlet zone and connected to the water distributor 1-2. A cap 1-3 is installed at the top opening of the water distributor 1-2. The seed discharge port on the top side of the water inlet zone is connected to the seed discharge pipe 1-7. A bottom pressure measuring device 1-4 is installed on the lower side of the water inlet zone. The water distributor 1-2, cap 1-3, perforated plate 1-5 and anti-clogging water caps 1-6 are used in combination to make the water distribution in the crystallization reactor uniform and avoid flow deviation. The amount of seed crystals in the reactor is judged by the increase of the pressure measured by the bottom pressure measuring device 1-4.

[0032] Example 1

[0033] This embodiment uses the removal of silicon and calcium from mine water as an example to illustrate the treatment effect of the present invention.

[0034] The alkalinity of the mine water reverse osmosis concentrate was 2.7 mmol / L, the calcium hardness was 13.3 mmol / L, the magnesium hardness was 9.7 mmol / L, and the silicon hardness was 11.6 mg / L. After screening and domestication, seed crystals with a particle size of approximately 0.4 mm were filled into the hardness and silicon removal crystallization reactor, with a seed crystal height of 1.8 m.

[0035] Mine water enters the water distributor 1-2 through the inlet pipe 1-1 for primary distribution and then enters the water inlet area. It is then further distributed and evenly distributed through the anti-clogging water cap 1-6. The water rises along the reaction cylinder 2-3 at an upward flow rate of 120 m / h. The seed crystals are in a fluidized state. At the same time, sodium hydroxide is added evenly to the water through the second alkali dosing distributor 2-1 and sodium aluminate is added evenly through the silicon removal agent dosing distributor 2-2. The agents and water are quickly and evenly mixed. The pH measured by the bottom pH measuring device 2-6 is controlled at 8-9, and a composite salt of aluminum silicate is formed on the surface of the seed crystals.

[0036] Water flows into the hardening section. Sodium hydroxide is added evenly by the first alkali dosing distributor 3-1, and sodium carbonate by the calcium removal agent dosing distributor 3-2. Under the action of the diversion functional component 3-3, the water enters the reaction zone from the transition zone. The diversion functional component 3-3 adopts an equilateral triangular pyramid design with a side length of 60% of the inner diameter of the reaction cylinder 2-3. The inner cylinder 3-5 adopts a symmetrical flat-topped cone design. The bottom diameter of the flat-topped cone is the same as the inner diameter of the reaction cylinder 2-3, and the top diameter of the flat-topped cone is 75% of the bottom diameter. Significant turbulence is formed at the diameter change position, such as... Figure 2 As shown. Carbonate ions and calcium ions react on the surface of the seed crystals to form calcium carbonate. The seed crystals circulate between the inner and outer tanks of the reactor, achieving water and seed crystallization in a circulating manner within the reactor. The pH measured by the top pH measuring device 4-3 is controlled between 9 and 11. After reducing silicon and hardness, the water is discharged through the outlet pipe 4-5. The calcium hardness removal rate is higher than 90%, and the silicon removal rate is about 60% to 80%.

[0037] Keep the influent flow rate constant, and ensure there is no scaling except in the hard section. Figure 3 As shown, after long-term operation, the pressure measured by the bottom pressure measuring device 1-4 increased from 0.1MPa to about 0.28MPa, the turbidity of the effluent quickly increased from about 15NTU to more than 40NTU, the seed height exceeded the design height, and mature seed crystals were discharged from the seed discharge pipe 1-7. The particle size was about 3mm, the calcium carbonate content was 88% to 91%, and the purity was high enough to achieve comprehensive utilization.

[0038] This invention has the following characteristics:

[0039] 1) The reaction zone is designed to achieve simultaneous removal of silicon and hardness. The lower silicon removal section has a weakly alkaline pH of 7-9, and the aluminum agent has a high silicon removal efficiency, achieving simultaneous removal of calcium and silicon in the lower section; the upper hardness removal section has a strong alkaline pH of 9-11, and deep hardness removal.

[0040] 2) The combined design of inner cylinder 3-5, outer cylinder 3-6 and flow diversion functional component 3-3 retains the advantages of inner cylinder 3-5 and outer cylinder 3-6, such as high seed utilization and suppression of homogeneous crystallization at the bottom. In addition, the traditional inner cylinder 3-5 is optimized into a wave-shaped structure, which can change the flow field morphology and increase local turbulence to improve efficiency. At the same time, the flow diversion functional component 3-3 is added to realize the turbulence in the transition zone, enhance the effect of seed fluidization, and solve the problem of blockage in the crystallization reactor.

[0041] 3) The bottom design incorporates a bottom pressure measuring device 1-4 to determine the amount of seed crystals in the reactor by increasing the bottom pressure. However, the bottom pressure changes with the influent flow rate, making it impossible to determine whether seed crystals need to be added solely based on the bottom pressure. In addition to pressure measurement, this invention adds a turbidity measuring device 4-4. When the seed crystal bed height exceeds the design height, the turbidity of the effluent will suddenly increase. This invention uses the effluent turbidity to predict the height of the seed crystal bed.

[0042] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the specific implementation of the present invention. Any modifications or equivalent substitutions that do not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. An enhanced synchronous hardening and desiliconization crystallization reactor device, characterized in that, It includes a shell, an outlet pipe (4-5), a first alkali dosing distributor (3-1), a calcium removal agent dosing distributor (3-2), a second alkali dosing distributor (2-1), a silicon removal agent dosing distributor (2-2), an inlet pipe (1-1), and a seed crystal discharge pipe (1-7); The shell is divided into an outlet area, a hardening section, a silica removal section and an inlet area from top to bottom. The top outlet of the outlet area is connected to the outlet pipe (4-5). An inner cylinder (3-5) is provided in the middle of the hardening section. The first alkali dosing port on the bottom side of the hardening section is connected to the first alkali dosing distributor (3-1). The calcium removal agent dosing port on the bottom side of the hardening section is connected to the calcium removal agent dosing distributor (3-2). A diversion function component (3-3) is provided inside the hardening section. The second alkali dosing port on the bottom side of the desiliconization section is connected to the second alkali dosing distributor (2-1), the desiliconization agent dosing port on the bottom side of the desiliconization section is connected to the desiliconization agent dosing distributor (2-2), the end of the water inlet pipe (1-1) is inserted into the water inlet area through the bottom of the water inlet area and then connected to the water distributor (1-2), and the seed discharge port on the top side of the water inlet area is connected to the seed discharge pipe (1-7); The inner cylinder (3-5) has a corrugated structure; A top-mounted pH measuring device (4-3) and a turbidity measuring device (4-4) are installed in the effluent area; A bottom pressure measuring device (1-4) is installed on the lower side of the water inlet area.

2. The enhanced synchronous hardening and desiliconization crystallization reactor device according to claim 1, characterized in that, It also includes a top sampling tube (4-2), and the top sampling port on the side of the water outlet is connected to the top sampling tube (4-2).

3. The enhanced synchronous hardening and desiliconization crystallization reactor device according to claim 1, characterized in that, It also includes a central sampling tube device (3-7), except that the central sampling port on the top side of the hard segment is connected to the central sampling tube device (3-7).

4. The enhanced synchronous hardening and desiliconization crystallization reactor device according to claim 3, characterized in that, The central sampling port, inner cylinder (3-5), diversion functional component (3-3), calcium removal agent dosing port and first alkali dosing port are distributed from top to bottom.

5. The enhanced synchronous hardening and desiliconization crystallization reactor device according to claim 1, characterized in that, An observation hole (3-4) is provided on the side of the hard section, and the observation hole (3-4) is directly opposite the lower side of the inner cylinder (3-5).

6. The enhanced synchronous hardening and desiliconization crystallization reactor device according to claim 1, characterized in that, It also includes a bottom sampling tube (2-5), and the bottom sampling port on the top side of the silicon removal section is connected to the bottom sampling tube (2-5).

7. The enhanced synchronous hardening and desiliconization crystallization reactor device according to claim 1, characterized in that, Bottom observation holes (2-4) are provided on the sidewall of the silicon removal section.

8. The enhanced synchronous hardening and desiliconization crystallization reactor device according to claim 1, characterized in that, A perforated plate (1-5) is provided in the water inlet area, and several anti-clogging water caps (1-6) are provided on the perforated plate (1-5); The top opening of the water distributor (1-2) is provided with a cap (1-3), and the perforated plate (1-5) is located on the upper side of the water distributor (1-2).

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