An internal pressure self-circulating heterogeneous crystallization fluidized bed water treatment device

Abstract

The invention discloses an internal pressure type self-circulating heterogeneous crystallization fluidized bed water treatment device. The inside of a cylinder is divided into a water inlet zone, a reagent mixing zone, a reaction reflux zone and a sedimentation separation zone from bottom to top. A water inlet distributor and a porous plate water cap are arranged in the water inlet zone. A #1 drug inlet and a #2 drug inlet are located above the porous plate water cap. The bottom of the seed discharge port is flush with the top of the porous plate water cap. The porous plate water cap is located on the upper side of the water inlet distributor, and the water inlet distributor is connected to the water inlet. A #1 drug distributor and a #2 drug distributor are arranged in the reagent mixing zone. The reaction reflux zone is divided into a reaction partition and a reflux partition from bottom to top. The upper side of the reaction partition is connected with the reflux partition through a guide pipe. The bottom of the reflux partition is connected with the bottom of the reaction partition through a reflux pipe. The device can effectively solve the problems that the seeds cannot circulate and grow during the treatment process, homogeneous crystallization is serious, and the utilization efficiency of the seeds is poor and the effluent water quality is poor.

Description

Technical Field

[0001] The invention relates to a water treatment device, in particular to an internal pressure type self-circulating heterogeneous crystallization fluidized bed water treatment device. Background Art

[0002] Chemical precipitation to remove target pollutants has become one of the most common water treatment technologies due to its advantages such as simple process, high reaction efficiency, and controllable effluent quality. For example, calcium carbonate can be generated to remove calcium hardness and alkalinity in water, magnesium ammonium phosphate can be generated to remove phosphate and ammonium in water, calcium fluorophosphate can be generated to remove fluoride and phosphate in water, and hydroxyapatite can be generated to deeply remove phosphate, etc. At present, chemical precipitation often uses coagulation and clarification process. The effluent quality of this process is stable, but the reaction rate is slow. It is usually equipped with a coagulant and coagulant dosing system, and a large amount of sludge is generated. It needs to be equipped with a complex sludge treatment system. The overall system is large and complex, and a large amount of sludge solid waste needs to be disposed of by other means. The cost of disposing of by-product sludge is high.

[0003] There are also some crystallization reactors on the market that attempt to remove target pollutants through crystallization. However, their seeds cannot be circulated or mechanical action occurs during the circulation process to damage the seeds. In actual operation, there is severe homogeneous crystallization, and the small solid particles generated are difficult to grow, which reduces the reaction rate and seed utilization. Summary of the invention

[0004] The purpose of the present invention is to overcome the shortcomings of the above-mentioned prior art and to provide an internal pressure self-circulating heterogeneous crystallization fluidized bed water treatment device, which can effectively solve the problems of the inability of crystal seeds to circulate and grow during the treatment process, severe homogeneous crystallization, poor crystal seed utilization efficiency and poor effluent water quality.

[0005] To achieve the above-mentioned purpose, the internal pressure self-circulating heterogeneous crystallization fluidized bed water treatment device of the present invention comprises a cylinder, a water inlet is provided at the bottom of the cylinder, a #1 drug inlet, a #2 drug inlet and a crystal seed discharge port are provided on the side of the lower part of the cylinder, a crystal seed addition port is provided on the side wall in the middle of the cylinder, and a water outlet pipe is provided on the top of the cylinder;

[0006] The inside of the cylinder is divided into a water inlet area, a reagent mixing area, a reaction reflux area and a sedimentation separation area from bottom to top. A water inlet distributor and a porous plate water cap are arranged in the water inlet area. The #1 drug inlet and the #2 drug inlet are located above the porous plate water cap. The bottom of the seed discharge port is flush with the top of the porous plate water cap. The porous plate water cap is located on the upper side of the water inlet distributor, and the water inlet distributor is connected to the water inlet.

[0007] A #1 drug distributor and a #2 drug distributor are provided in the drug mixing area, wherein the #1 drug distributor is connected to the #1 drug inlet, and the #2 drug distributor is connected to the #2 drug inlet;

[0008] The reaction reflux zone is divided into a reaction zone and a reflux zone from bottom to top. The upper side of the reaction zone is connected with the reflux zone through a guide pipe; the bottom of the reflux zone is connected with the bottom of the reaction zone through a reflux pipe.

[0009] A bottom manhole is provided at the bottom of the cylinder;

[0010] A top manhole is provided on the top of the cylinder.

[0011] A #1 drug inlet check valve is provided at the #1 drug inlet, a #2 drug inlet check valve is provided at the #2 drug inlet; and a seed addition check valve is provided at the seed addition port.

[0012] It also includes an upper sampling tube, a middle sampling tube and a lower sampling tube; the upper sampling tube, the middle sampling tube and the lower sampling tube are respectively connected to the side of the cylinder, and the upper sampling tube, the middle sampling tube and the lower sampling tube are respectively provided with an upper sampling valve, a middle sampling valve and a lower sampling valve.

[0013] The side of the cylinder is provided with a sedimentation separation zone observation hole, a reflux partition observation hole and a reaction zone observation hole in sequence from top to bottom.

[0014] The number of the flow guide pipes is greater than or equal to 2, and the flow guide pipes are evenly distributed along the circumferential direction.

[0015] The height of the vertical section in the guide pipe located in the reflux partition is greater than 100 mm, the upper end of the guide pipe is bent toward the center of the cylinder, and the angle θ between the bent part and the horizontal plane is 0°-180°.

[0016] An upward turning water plate is arranged above the guide pipe, and the upward turning water plate is connected with the inner wall of the cylinder through an upward turning water plate supporting frame.

[0017] The top of the reflux pipe is flush with the bottom of the reflux partition, a one-way check valve is arranged at the bottom of the reflux pipe, and the reflux pipe is connected and fixed to the inner wall of the cylinder through a reflux pipe support frame.

[0018] A lower water-turning plate is provided below the return pipe, and the lower water-turning plate is connected to the side wall of the lower end of the return pipe through a lower water-turning plate support frame;

[0019] The sedimentation separation zone is provided with a number of baffles.

[0020] The present invention has the following beneficial effects:

[0021] In the specific operation of the internal pressure self-circulating heterogeneous crystallization fluidized bed water treatment device described in the present invention, the water in the reflux partition is circulated to the bottom of the reaction partition through the reflux pipe, which not only improves the rising flow rate of the reaction partition, enhances the fluidization degree of the reaction partition, and strengthens the ion reaction, but also the water with low ion concentration in the reflux partition is refluxed to the bottom of the reaction partition, reducing the ion concentration product of the crystal at the bottom of the reaction partition, which plays a positive role in inhibiting homogeneous crystallization and improving the water quality of the effluent. At the same time, the crystal seeds realize self-circulation in the reactor, improve the utilization efficiency of the crystal seeds, and solve the problems of small-particle crystal seeds at the top and large-particle crystal seeds at the bottom of the single-tube fluidized bed reactor, the bottom reagent concentration and the raw water ion concentration are the highest, the crystal ion concentration product is the largest, the homogeneous crystallization is serious, the reaction rate is low, and the crystal seed growth rate is slow. It should be noted that the present invention has a wide range of applications. The added reagent reacts with ions in water to generate solids on the surface of the seed crystals. The sedimentation rate is fast, the sedimentation and separation time is extremely short, the product has high purity and can be recycled. There is no need to add auxiliary reagents such as coagulants and flocculants, and there is no new solid waste such as sludge. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 Schematic diagram of the external structure of the device.

[0023] Figure 2 A schematic diagram of the internal structure of the device.

[0024] Among them, 1 is the cylinder, 2 is the water inlet area, 3 is the reagent mixing area, 4 is the reaction reflux area, 5 is the sedimentation separation area, 1-1 is the water inlet, 1-2 is the #1 drug inlet, 1-2-1 is the #1 drug inlet check valve, 1-3 is the #2 drug inlet, 1-3-1 is the #2 drug inlet check valve, 1-4 is the seed discharge port, 1-5 is the seed addition port, 1-5-1 is the seed addition check valve, 1-6 is the water outlet pipe, 1-7 is the upper sampling pipe, 1-7-1 is the upper sampling valve, 1-8 is the middle sampling pipe, 1-8-1 is the middle sampling valve, 1-9 is the lower sampling pipe, 1-9-1 is the lower sampling valve, 1-10 is the observation hole of the sedimentation separation area 5 , 1-11 is the observation hole of the reflux partition 4-2, 1-12 is the observation hole of the reaction zone, 1-13 is the top manhole, 1-14 is the bottom manhole, 2-1 is the water inlet distributor, 2-2 is the porous plate water cap, 3-1 is the #1 medicine distributor, 3-2 is the #2 medicine distributor, 4-1 is the reaction partition, 4-1-1 is the guide pipe, 4-1-2 is the reflux pipe, 4-1-3 is the reflux pipe support frame, 4-1-4 is the one-way check valve, 4-1-5 is the lower water turn plate, 4-1-6 is the lower water turn plate support frame, 4-2 is the reflux partition, 4-2-1 is the upper water turn plate, 4-2-2 is the upper water turn plate support frame, 5 is the sedimentation separation zone, 5-1 is the deflection baffle. DETAILED DESCRIPTION

[0025] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiment of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiment of the present invention. Obviously, the described embodiment is only an embodiment of a part of the present invention, not all embodiments, and is not intended to limit the scope of the present invention. In addition, in the following description, the description of well-known structures and technologies is omitted to avoid unnecessary confusion of the concepts disclosed in the present invention. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work should fall within the scope of protection of the present invention.

[0026] The accompanying drawings show schematic diagrams of structures according to embodiments disclosed in the present invention. These figures are not drawn to scale, and some details are magnified and some details may be omitted for the purpose of clear expression. The shapes of various regions and layers shown in the figures and the relative sizes and positional relationships therebetween are only exemplary, and may deviate in practice due to manufacturing tolerances or technical limitations, and those skilled in the art may additionally design regions / layers with different shapes, sizes, and relative positions according to actual needs.

[0027] refer to Figure 1 and Figure 2 The internal pressure self-circulating heterogeneous crystallization fluidized bed water treatment device of the present invention comprises a cylinder 1, a water inlet 1-1 and a bottom manhole 1-14 are provided at the bottom of the cylinder 1, a #1 drug inlet 1-2, a #2 drug inlet 1-3 and a seed crystal discharge port 1-4 are provided on the side of the lower part of the cylinder 1, a porous plate water cap 2-2 is provided at the bottom of the cylinder 1, wherein a #1 drug inlet check valve 1-2-1 is provided at the #1 drug inlet 1-2, a #2 drug inlet check valve 1-3-1 is provided at the #2 drug inlet 1-3, the #1 drug inlet 1-2 and the #2 drug inlet 1-3 are located above the porous plate water cap 2-2, and the bottom of the seed crystal discharge port 1-4 is flush with the top of the porous plate water cap 2-2; A seed adding port 1-5 is arranged on the side wall in the middle of the cylinder 1, and a seed adding check valve 1-5-1 is arranged at the seed adding port 1-5; a water outlet pipe 1-6 and a top manhole 1-13 are arranged on the top of the cylinder 1; an upper sampling tube 1-7, a middle sampling tube 1-8 and a lower sampling tube 1-9 are respectively connected to the side of the cylinder 1, and an upper sampling valve 1-7-1, a middle sampling valve 1-8-1 and a lower sampling valve 1-9-1 are respectively arranged on the upper sampling tube 1-7, the middle sampling tube 1-8 and the lower sampling tube 1-9; a sedimentation separation zone observation hole 1-10, a reflux partition observation hole 1-11 and a reaction zone observation hole 1-12 are arranged on the side of the cylinder 1 from top to bottom;

[0028] The interior of the cylinder 1 is divided into a water inlet zone 2, a reagent mixing zone 3, a reaction reflux zone 4 and a sedimentation separation zone 5 from bottom to top.

[0029] A water inlet distributor 2-1 is provided in the water inlet area 2, a porous plate water cap 2-2 is located on the upper side of the water inlet distributor 2-1, and the water inlet distributor 2-1 is connected to the water inlet 1-1, and the porous plate water cap 2-2 has a design to prevent seed crystal clogging.

[0030] The drug mixing area 3 includes a #1 drug distributor 3-1 and a #2 drug distributor 3-2, wherein the #1 drug distributor 3-1 is connected to the #1 drug inlet 1-2, and the #2 drug distributor 3-2 is connected to the #2 drug inlet 1-3. Different drugs enter the corresponding drug distributor through different drug inlets, and the drug distributor has a design to prevent seed crystal clogging.

[0031] The reaction reflux zone 4 is divided into a reaction zone 4-1 and a reflux zone 4-2 from bottom to top. The upper side of the reaction zone 4-1 is connected to the reflux zone 4-2 through a flow guide pipe 4-1-1; the lower side of the reflux zone 4-2 is connected to the bottom of the reaction zone 4-1 through a reflux pipe 4-1-2, so as to realize the circulation crystallization of water and seed crystals in the reaction reflux zone 4;

[0032] The number of the guide pipes 4-1-1 is greater than or equal to 2, and the guide pipes 4-1-1 are evenly distributed along the circumferential direction. The height of the vertical section of the guide pipe 4-1-1 located in the reflux partition 4-2 is greater than 100 mm. The top of the guide pipe 4-1-1 is bent toward the center of the cylinder 1, and the angle θ between the bent part and the horizontal plane is greater than 0° and less than 180°.

[0033] An upward water plate 4-2-1 is arranged above the flow guide pipe 4-1-1. The upward water plate 4-2-1 is circular or polygonal. The size of the upward water plate 4-2-1 is larger than the size of the area between the tops of the flow guide pipes 4-1-1, so as to reduce the influence of the water flow of the flow guide pipe 4-1-1 on the settling of the seed crystals in the settling separation zone 5. The upward water plate 4-2-1 is connected to the inner wall of the cylinder 1 through the upward water plate support frame 4-2-2;

[0034] The top of the reflux pipe 4-1-2 is flush with the bottom of the reflux partition 4-2. A one-way check valve 4-1-4 is provided at the bottom of the reflux pipe 4-1-2. Water and crystal seeds can flow from top to bottom through the reflux pipe 4-1-2. The water and crystal seeds in the reaction partition 4-1 cannot enter the reflux pipe 4-1-2 from bottom to top. The reflux pipe 4-1-2 is connected and fixed to the inner wall of the cylinder 1 through the reflux pipe support frame 4-1-3.

[0035] A lower water-turning plate 4-1-5 is provided below the return pipe 4-1-2. The lower water-turning plate 4-1-5 is circular or polygonal. The size of the lower water-turning plate 4-1-5 is larger than the size of the area where the one-way check valve 4-1-4 is located, so as to avoid the impact of the descending water flow of the return pipe 4-1-2 on the #1 applicator 3-1 and the #2 applicator 3-2. The distance between the lower water-turning plate 4-1-5 and the #2 applicator 3-2 is greater than 100 mm. The lower water-turning plate 4-1-5 is connected to the side wall of the lower end of the return pipe 4-1-2 through the lower water-turning plate support frame 4-1-6;

[0036] The sedimentation separation zone 5 is provided with a plurality of baffles 5-1 to intercept the rising seed crystals and accelerate the sedimentation separation.

[0037] Embodiment 1

[0038] The following takes the decalcification of mine water (low alkalinity and high hardness) as an example to illustrate the specific implementation method and treatment effect of the device.

[0039] Low alkalinity and high hardness mine water (alkalinity 2.82mmol / L, calcium hardness 9.5mmol / L, magnesium hardness 9.2mmol / L, turbidity 2.19NTU) enters the T-shaped wire-wound tube water distributor 2-1 through the water inlet 1-1 for primary distribution and evenly enters the water inlet chamber, and then passes through the porous plate water cap 2-2 for secondary distribution and evenly distributes, rising along the cylinder 1 at an upward flow rate of 100m / h. At the same time, sodium hydroxide with a mass concentration of 30% is evenly added into the water from the #1 drug inlet 1-2 through the #1 drug distributor 3-1; sodium carbonate with a mass concentration of 10% is evenly added into the water from the #2 drug inlet 1-3 through the #2 drug distributor 3-2, and the agent and water are quickly and evenly mixed.

[0040] The screened and domesticated seeds are filled in the reaction partition 4-1, and water mixed with sodium hydroxide and sodium carbonate reagents enters the reaction partition 4-1 from bottom to top. The seeds are in a fluidized state in the reaction partition 4-1. Chemical reactions occur during the rising process to generate calcium carbonate on the surface of the seeds. The fluidized seeds enter the reflux partition 4-2 through the guide pipe 4-1-1, and enter the sedimentation separation zone 5 from the reaction partition 4-1 through the reflux partition 4-2. The sedimentation separation zone 5 is provided with a baffle 5-1 to intercept the rising seeds. The sedimentation separation zone 5 is settled. The seed crystals fall back into the bottom of the reflux partition 4-2, and the descending water flow and seed crystals of the reflux partition 4-2 enter the reaction partition 4-1 through the reflux pipe 4-1-2, realizing the circulation crystallization of water and seed crystals in the reaction reflux zone 4, and the water with reduced alkalinity and hardness is discharged through the outlet pipe 1-6. The pH value of the outlet water is 10.86, the total alkalinity is 1.41mmol / L, the calcium hardness is 1.02mmol / L, the magnesium hardness is 8.58mmol / L, the turbidity is 3.57NTU, and the calcium hardness removal rate is 89%.

[0041] As the reaction time increases, more and more calcium carbonate is generated on the surface of the seed crystals, and the seed crystals continue to grow. The calcium carbonate content of the seed crystals is greater than 90%, which meets the requirements of the limestone gypsum wet desulfurization for desulfurizers. Finally, the seed crystals are discharged from discharge ports 1-4 to achieve comprehensive utilization.

[0042] The above is only an example of the implementation steps of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. An internal pressure self-circulating heterogeneous crystallization fluidized bed water treatment device, characterized in that: It comprises a cylinder (1), wherein a water inlet (1-1) is provided at the bottom of the cylinder (1), a #1 drug inlet (1-2), a #2 drug inlet (1-3) and a seed crystal discharge port (1-4) are provided on the side surface of the lower part of the cylinder (1), a seed crystal addition port (1-5) is provided on the side wall in the middle part of the cylinder (1), and a water outlet pipe (1-6) is provided at the top of the cylinder (1); The interior of the cylinder (1) is divided into a water inlet area (2), a reagent mixing area (3), a reaction reflux area (4) and a sedimentation separation area (5) from bottom to top. A water inlet distributor (2-1) and a porous plate water cap (2-2) are arranged in the water inlet area (2). The #1 drug inlet (1-2) and the #2 drug inlet (1-3) are located above the porous plate water cap (2-2). The bottom of the seed crystal discharge port (1-4) is flush with the top of the porous plate water cap (2-2). The porous plate water cap (2-2) is located on the upper side of the water inlet distributor (2-1), and the water inlet distributor (2-1) is connected to the water inlet (1-1). A #1 drug distributor (3-1) and a #2 drug distributor (3-2) are provided in the drug mixing area (3), wherein the #1 drug distributor (3-1) is connected to the #1 drug inlet (1-2), and the #2 drug distributor (3-2) is connected to the #2 drug inlet (1-3); The reaction reflux zone (4) is divided into a reaction zone (4-1) and a reflux zone (4-2) from bottom to top. The upper side of the reaction zone (4-1) is connected to the reflux zone (4-2) via a flow guide pipe (4-1-1); the bottom of the reflux zone (4-2) is connected to the bottom of the reaction zone (4-1) via a reflux pipe (4-1-2); The number of the flow guide pipes (4-1-1) is greater than or equal to 2, and the flow guide pipes (4-1-1) are evenly distributed along the circumferential direction; The upper end of the flow guide pipe (4-1-1) is bent toward the center of the cylinder (1); An upward water plate (4-2-1) is arranged above the guide pipe (4-1-1); The fluidized seed crystals in the reaction partition (4-1) enter the reflux partition (4-2) through the flow guide pipe (4-1-1); The descending water flow and seed crystals of the reflux partition (4-2) enter the reaction partition (4-1) through the reflux pipe (4-1-2).

2. The internal pressure self-circulating heterogeneous crystallization fluidized bed water treatment device according to claim 1, characterized in that: A bottom manhole (1-14) is provided at the bottom of the cylinder (1); A top manhole (1-13) is provided on the top of the cylinder (1).

3. The internal pressure self-circulating heterogeneous crystallization fluidized bed water treatment device according to claim 1, characterized in that: A #1 drug inlet check valve (1-2-1) is provided at the #1 drug inlet (1-2), a #2 drug inlet check valve (1-3-1) is provided at the #2 drug inlet (1-3); and a seed addition check valve (1-5-1) is provided at the seed addition port (1-5).

4. The internal pressure self-circulating heterogeneous crystallization fluidized bed water treatment device according to claim 1, characterized in that: It also comprises an upper sampling tube (1-7), a middle sampling tube (1-8) and a lower sampling tube (1-9); the upper sampling tube (1-7), the middle sampling tube (1-8) and the lower sampling tube (1-9) are respectively connected to the side of the cylinder (1); and the upper sampling tube (1-7), the middle sampling tube (1-8) and the lower sampling tube (1-9) are respectively provided with an upper sampling valve (1-7-1), a middle sampling valve (1-8-1) and a lower sampling valve (1-9-1).

5. The internal pressure self-circulating heterogeneous crystallization fluidized bed water treatment device according to claim 1, characterized in that: The side of the cylinder (1) is provided with a sedimentation separation zone observation hole (1-10), a reflux zone observation hole (1-11) and a reaction zone observation hole (1-12) in sequence from top to bottom.

6. The internal pressure self-circulating heterogeneous crystallization fluidized bed water treatment device according to claim 1, characterized in that: The height of the vertical section of the guide pipe (4-1-1) located in the reflux partition (4-2) is greater than 100 mm, and the angle θ between the bent portion and the horizontal plane is 0°-180°.

7. The internal pressure self-circulating heterogeneous crystallization fluidized bed water treatment device according to claim 1, characterized in that: The upward water-turning plate (4-2-1) is connected to the inner wall of the cylinder (1) via an upward water-turning plate support frame (4-2-2).

8. The internal pressure self-circulating heterogeneous crystallization fluidized bed water treatment device according to claim 1, characterized in that: The top of the reflux pipe (4-1-2) is flush with the bottom of the reflux partition (4-2), a one-way check valve (4-1-4) is provided at the bottom of the reflux pipe (4-1-2), and the reflux pipe (4-1-2) is connected and fixed to the inner wall of the cylinder (1) via a reflux pipe support frame (4-1-3).

9. The internal pressure self-circulating heterogeneous crystallization fluidized bed water treatment device according to claim 1, characterized in that: A lower water-turning plate (4-1-5) is provided below the return pipe (4-1-2), and the lower water-turning plate (4-1-5) is connected to the side wall of the lower end of the return pipe (4-1-2) via a lower water-turning plate support frame (4-1-6); The sedimentation separation zone (5) is provided with a plurality of baffle plates (5-1).

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