Electrochemical softening device of crystallization and granulation fluidized bed

Abstract

The utility model relates to an electrochemical softening device of a crystallization and granulation fluidized bed, which belongs to the field of water treatment and comprises a cylinder, a seed crystal feeding port is arranged at the upper end of the cylinder, and a particle discharge port is arranged at the lower end of the cylinder; the microfiltration tube with the pore diameter smaller than that of the seed crystal is mounted in the cylinder body and divides the cylinder body into a cathode reaction region and an anode reaction region; the rod-shaped anode extends into the microfiltration tube, is positioned in the anode reaction region and is connected with a positive electrode of a power supply, and a negative electrode of the power supply is connected with the barrel; the main water inlet pipe is connected with a cathode reaction zone water inlet pipe and an anode reaction zone water inlet pipe respectively, the cathode reaction zone water inlet pipe is connected with the bottom of the barrel, and the anode reaction zone water inlet pipe extends into the barrel to be connected with the bottom of the microfiltration pipe; one water inlet end of the water outlet pipe is respectively connected with the upper ends of the microfiltration pipes and the top end of the barrel. According to the device, a crystallization granulation fluidized bed technology and an electrochemical softening technology are combined, the utilization rate of a cathode product is improved through induced crystallization of seed crystals, the softening and descaling efficiency of the device is greatly improved, and meanwhile, formation of scales on the surface of the cathode is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of water treatment, in particular to a crystallization granulation fluidized bed electrochemical softening device. Background Art

[0002] As a new green water treatment technology in recent years, electrochemical softening technology can soften and remove hardness of water without adding any chemical agents, and has a very broad application prospect. Although electrochemical softening and descaling technology has been applied in industry, it has not been widely promoted. The reason is that this technology has problems such as low softening and descaling efficiency and cathode descaling. At present, the main technical solutions used to address these problems are to increase the cathode area to improve the treatment effect of the equipment; to use single means such as mechanical scraping, pole reversal, hydraulic and air assistance, and ultrasound for cathode descaling. On the one hand, these technical solutions cannot fundamentally solve the problems of low softening and descaling efficiency and cathode descaling. On the other hand, while increasing the complexity of the equipment, it will also increase the operating energy consumption of the equipment.

[0003] Therefore, it is necessary to design a crystallization granulation fluidized bed electrochemical softening device to overcome the above problems. Utility Model Content

[0004] The utility model aims to provide a crystallization granulation fluidized bed electrochemical softening device, which combines the crystallization granulation fluidized bed technology with the electrochemical softening technology. On the one hand, the utilization rate of the cathode product is improved by the induced crystallization of the crystal seeds, and the softening and descaling efficiency of the device is greatly improved; on the other hand, under the fluidized state, most of the crystallization scaling reaction occurs on the crystal seeds, which reduces the formation of scale on the cathode surface.

[0005] The utility model provides a crystallization granulation fluidized bed electrochemical softening device, comprising: a cylinder, a microfiltration tube, a rod-shaped anode, a water inlet main pipe, a cathode reaction zone water inlet pipe, an anode reaction zone water inlet pipe, and a water outlet pipe;

[0006] A seed addition port is provided at the upper end of the cylinder, and a particle discharge port is provided at the lower end; a microfiltration tube with an aperture smaller than the seed is installed in the cylinder, and the cylinder is divided into a cathode reaction zone and an anode reaction zone, the inside of the microfiltration tube is the anode reaction zone, and the outside of the microfiltration tube is the cathode reaction zone; a rod-shaped anode extends into the microfiltration tube and is located in the anode reaction zone, the rod-shaped anode is connected to the positive pole of the power supply, and the negative pole of the power supply is connected to the cylinder; a water inlet main pipe is respectively connected to the cathode reaction zone water inlet pipe and the anode reaction zone water inlet pipe, the cathode reaction zone water inlet pipe is connected to the bottom of the cylinder, and the anode reaction zone water inlet pipe extends into the cylinder and is connected to the bottom of the microfiltration tube; one end of the water inlet of the outlet pipe is respectively connected to the upper end of the microfiltration tube and the top of the cylinder.

[0007] Furthermore, the inner side of the cylinder is made of stainless steel and serves as the cathode of the electrochemical reaction.

[0008] Furthermore, the filtration pore size of the microfiltration tube is 0.1-10 μm.

[0009] Furthermore, the rod-shaped anode adopts a two-section design, the upper section is made of insulating material, and the lower section is an insoluble anode.

[0010] Furthermore, the insoluble anode is a graphite or metal oxide coated titanium electrode.

[0011] Furthermore, a separation layer is provided at the upper end of the cylinder and is located above the seed crystal addition port for filtering the seed crystals.

[0012] Furthermore, the electrode reaction and crystallization reaction occurring in the cathode reaction zone are:

[0013] Electrode reaction: 2H2O+2e - →H2↑+2OH - ;O2+2H2O+4e - →4OH - ;

[0014] Crystallization reaction: HCO3 - +OH - →CO3 2- +H2O;CO3 2- +Ca 2+ →CaCO3↓.

[0015] Furthermore, the electrode reaction and crystallization reaction occurring in the anode reaction zone are:

[0016] Cl - -2e - →Cl2↑;

[0017] Cl2+H2O→HClO+H + +Cl - ;

[0018]

[0019] 2H2O-4e - →4H + +O2↑.

[0020] Furthermore, the water inlet end of the water outlet pipe is connected to the top of the cylinder and the upper end of the microfiltration tube through the cathode reaction zone water outlet pipe and the anode reaction zone water outlet pipe respectively.

[0021] The utility model has the following advantages and beneficial effects:

[0022] (1) The electrochemical softening and descaling efficiency is higher. The seed crystals provide more reaction area for the crystallization process of cathode products and scaling ions in water, which increases the reaction rate and greatly improves the utilization rate of cathode products.

[0023] (2) The cathode has strong anti-scaling ability. Since most of the crystallization process occurs on the seed crystal, the problem of the cathode being covered by scale is well delayed. At the same time, the equipment is operated in a fluidized state, and the seed crystal and water flow play a flushing role;

[0024] (3) The device of the utility model is compact in design and can be used as a unit structure for large-scale application. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a schematic structural diagram of a crystallization granulation fluidized bed electrochemical softening device according to a preferred embodiment of the utility model;

[0026] Figure 2 A three-dimensional cross-sectional view of a crystallization granulation fluidized bed electrochemical softening device according to a preferred embodiment of the utility model;

[0027] Figure 3 A cross-sectional view of a fluidized bed electrochemical softening device for crystallization and granulation according to a preferred embodiment of the utility model;

[0028] Description of Figure Numbers:

[0029] 1. water inlet main pipe 1; 11. cathode reaction zone water inlet pipe 11; 12. anode reaction zone water inlet pipe 12; 2. rod-shaped anode 2; 3. cylinder 3; 4. water outlet pipe 4; 41. cathode reaction zone water outlet pipe 41; 42. anode reaction zone water outlet pipe 42; 5. seed addition port 5; 6. particle discharge port 6; 7. cathode reaction zone 7; 8. anode reaction zone 8; 9. microfiltration tube 9; 10. separation layer 10. DETAILED DESCRIPTION

[0030] For a better understanding of the present invention, the following embodiments are further explanations of the present invention, but the content of the present invention is not limited to the following embodiments.

[0031] like Figures 1 to 3 As shown, a crystallization granulation fluidized bed electrochemical softening device includes: a cylinder 3, a microfiltration tube 9, a rod-shaped anode 2, a water inlet main pipe 1, a cathode reaction zone water inlet pipe 11, an anode reaction zone water inlet pipe 12, and a water outlet pipe 4.

[0032] Among them. A seed injection port 5 is provided at the upper end of the cylinder 3, and a particle discharge port 6 is provided at the lower end; a separation layer 10 is provided at the upper end of the cylinder 3 and is located above the seed injection port 5, for filtering the seed crystals. A microfiltration tube 9 with a pore size smaller than the seed crystal is installed in the cylinder 3, and the cylinder 3 is divided into a cathode reaction zone 7 and an anode reaction zone 8. The inside of the microfiltration tube 9 is the anode reaction zone 8, and the outside of the microfiltration tube 9 is the cathode reaction zone 7. The rod-shaped anode 2 extends into the microfiltration tube 9 and is located in the anode reaction zone 8. The rod-shaped anode 2 is connected to the positive pole of the power supply, and the negative pole of the power supply is connected to the cylinder 3. The water inlet main pipe 1 is respectively connected to the cathode reaction zone water inlet pipe 11 and the anode reaction zone water inlet pipe 12. The cathode reaction zone water inlet pipe 11 is connected to the bottom of the cylinder 3, and the anode reaction zone water inlet pipe 12 extends into the cylinder 3 and is connected to the bottom of the microfiltration tube 9. The water inlet end of the water outlet pipe 4 is connected to the top of the cylinder 3 and the upper end of the microfiltration tube 9 through the cathode reaction zone water outlet pipe 41 and the anode reaction zone water outlet pipe 42 respectively.

[0033] At the same time, the inner side of the cylinder 3 is made of stainless steel, which serves as the cathode of the electrochemical reaction. The filtration aperture of the microfiltration tube 9 is 0.1-10 μm, which effectively prevents the entry of seed crystals. The rod-shaped anode 2 adopts a two-stage design, the upper section is made of insulating material, and the lower section is an insoluble anode, which is a graphite or metal oxide coated titanium electrode.

[0034] In actual application, water is divided into two streams after passing through the water inlet main pipe 1, and enters the cathode reaction zone water inlet pipe 11 and the anode reaction zone water inlet pipe 12 respectively; water passes through the cathode reaction zone water outlet pipe 41 and the anode reaction zone water outlet pipe 42 and then merges and is discharged from the device through the water outlet pipe 4. At the same time, the microfiltration tube 9 divides the cylinder 3 into the cathode reaction zone 7 and the anode reaction zone 8; water enters the cathode reaction zone 7 through the cathode reaction zone water inlet pipe 11, and crystal seeds are added to the cathode reaction zone 7 through the crystal seed adding port 5.

[0035] In the cathode reaction zone 7, the electrode reaction and crystallization reaction mainly occur as follows:

[0036] Electrode reaction: 2H2O+2e - →H2↑+2OH - ;O2+2H2O+4e - →4OH - ;

[0037] Crystallization reaction: HCO3 - +OH - →CO3 2- +H2O;CO3 2- +Ca 2+ →CaCO3↓.

[0038] Scaling ions in water (Ca 2+ Mg 2+ etc.) and OH - 、HCO3 - 、CO32- The softened water is separated from the seed particles by the separation layer 10 and then discharged from the outlet pipe 4 through the cathode reaction zone outlet pipe 41; as the crystallization reaction occurs, the seed particles gradually form large particles that settle to the bottom of the device and are eventually discharged from the device through the particle discharge port 6.

[0039] Water enters the anode reaction zone 8 from the anode reaction zone water inlet pipe 12. In the anode reaction zone 8, the following reactions mainly occur:

[0040] Cl - -2e - →Cl2↑;

[0041] Cl2+H2O→HClO+H + +Cl - ;

[0042]

[0043] 2H2O-4e - →4H + +O2↑.

[0044] Through the above reaction process, active chlorine components with strong oxidizing properties are produced, which play a bactericidal role.

[0045] The device combines the crystallization granulation fluidized bed technology with the electrochemical softening technology. On the one hand, it improves the utilization rate of the cathode product through the induced crystallization of the seed crystal, greatly improving the softening and descaling efficiency of the device; on the other hand, under the fluidized state, most of the crystallization scaling reaction occurs on the seed crystal, reducing the formation of scale on the cathode surface.

[0046] The above is only a preferred implementation of the present utility model, which certainly cannot be used to limit the scope of rights of the present utility model. It should be pointed out that for ordinary technicians in this technical field, several improvements and changes can be made without departing from the principle of the present utility model, and these improvements and changes are also regarded as the protection scope of the present utility model.

Claims

1. A crystallization granulation fluidized bed electrochemical softening device, characterized in that: include: Cylinder, microfiltration tube, rod-shaped anode, water inlet main pipe, cathode reaction zone water inlet pipe, anode reaction zone water inlet pipe, and water outlet pipe; A seed addition port is provided at the upper end of the cylinder, and a particle discharge port is provided at the lower end; a microfiltration tube with an aperture smaller than the seed is installed in the cylinder, and the cylinder is divided into a cathode reaction zone and an anode reaction zone, the inside of the microfiltration tube is the anode reaction zone, and the outside of the microfiltration tube is the cathode reaction zone; a rod-shaped anode extends into the microfiltration tube and is located in the anode reaction zone, the rod-shaped anode is connected to the positive pole of the power supply, and the negative pole of the power supply is connected to the cylinder; a water inlet main pipe is respectively connected to the cathode reaction zone water inlet pipe and the anode reaction zone water inlet pipe, the cathode reaction zone water inlet pipe is connected to the bottom of the cylinder, and the anode reaction zone water inlet pipe extends into the cylinder and is connected to the bottom of the microfiltration tube; one end of the water inlet of the outlet pipe is respectively connected to the upper end of the microfiltration tube and the top of the cylinder.

2. The crystallization granulation fluidized bed electrochemical softening device as claimed in claim 1, characterized in that: The inner side of the cylinder is made of stainless steel and serves as the cathode for the electrochemical reaction.

3. The electrochemical softening device for crystallization and granulation in fluidized bed as claimed in claim 1, characterized in that: The pore size of the microfiltration tube is 0.1-10μm.

4. The crystallization granulation fluidized bed electrochemical softening device as claimed in claim 1, characterized in that: The rod-shaped anode adopts a two-section design, the upper section is made of insulating material and the lower section is an insoluble anode.

5. The crystallization granulation fluidized bed electrochemical softening device as claimed in claim 4, characterized in that: The insoluble anode is graphite, metal oxide coated titanium electrode.

6. The crystallization granulation fluidized bed electrochemical softening device as claimed in claim 1, characterized in that: A separation layer is provided at the upper end of the cylinder and is located above the seed crystal addition port for filtering the seed crystals.

7. The crystallization granulation fluidized bed electrochemical softening device as claimed in claim 1, characterized in that: The electrode reaction and crystallization reaction occurring in the cathode reaction zone are: Electrode reaction: 2H2O+2e - →H2↑+2OH - ;O2+2H2O+4e - →4OH - ; Crystallization reaction: HCO3 - +OH - →CO3 2- +H2O;CO3 2- +Ca 2+ →CaCO3↓.

8. The crystallization granulation fluidized bed electrochemical softening device as claimed in claim 1, characterized in that: The electrode reaction and crystallization reaction occurring in the anode reaction zone are: Cl - -2e - →Cl2↑; Cl2+H2O→HClO+H + +Cl - ; 2H2O-4e - →4H + +O2↑.

9. The crystallization granulation fluidized bed electrochemical softening device as claimed in claim 1, characterized in that: The water inlet end of the water outlet pipe is connected with the top of the cylinder and the upper end of the microfiltration tube through the cathode reaction zone water outlet pipe and the anode reaction zone water outlet pipe respectively.

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