Cathode protection copper sulfate evaporator

Abstract

The utility model discloses a cathode protection copper sulfate evaporator, which is characterized in that a plurality of anodes are arranged in the copper sulfate evaporator, the anodes are inserted in a copper sulfate solution in the copper sulfate evaporator, and the anodes, a cathode binding post and a reference electrode are all connected with a constant potential controller; the constant potential controller, the anode, the copper sulfate solution in the copper sulfate evaporator and the copper sulfate evaporator body form a current loop, the controller outputs direct current, and the protection potential of the equipment is changed by automatically controlling the magnitude of the output direct current until the potential of the equipment reaches the protection potential ranging from-0.1 V to-0.6 V; a cathode protection anti-corrosion technology is applied to the copper sulfate evaporator, uniform corrosion and pitting corrosion caused by high-temperature dilute sulphuric acid and high-concentration chloride ions of equipment materials in a copper sulfate solution are prevented, the corrosion speed is reduced, and the service life is prolonged.

Description

Technical Field

[0001] This utility model belongs to the technical field of copper sulfate evaporators, and particularly relates to a cathodic protection copper sulfate evaporator. Background Technology

[0002] Copper sulfate, as an important chemical raw material, has wide applications in many fields. The working principle of a copper sulfate evaporator is based on heat transfer and flash evaporation. By heating the copper sulfate solution under slight negative pressure, the solution rapidly boils and vaporizes, causing the water to evaporate quickly, thus achieving efficient evaporation. However, after repeated concentrations, the copper sulfate solution accumulates a large amount of chloride ions, with concentrations reaching up to 20,000 ppm. This causes severe pitting corrosion in high-efficiency copper sulfate evaporators made of carbon steel or stainless steel, with a corrosion rate as high as 32 mm / year. Even a 16 mm thick cylinder section showed signs of corrosion perforation after only six months. The presence of high-temperature dilute sulfuric acid in the copper sulfate solution also causes uniform corrosion of the equipment. These phenomena significantly increase equipment wear and tear, severely reduce equipment lifespan, and force production companies to incur substantial maintenance costs, resulting in significant economic losses. Utility Model Content

[0003] (1) Technical problem to be solved: In view of the corrosiveness of copper sulfate solution to evaporators, this utility model provides a cathodic protection copper sulfate evaporator. Through electrochemical protection, the external current is used to change the metal potential, thereby reducing the metal corrosion rate and improving the service life of the equipment.

[0004] (2) The technical solution adopted by this utility model is as follows:

[0005] A cathodic-protected copper sulfate evaporator is provided, comprising a material inlet, a material outlet, and a steam outlet. Several anodes are installed inside the evaporator, inserted into a copper sulfate solution within the evaporator. A cathode terminal and a reference electrode are installed on the outer wall of the evaporator. The anodes, cathode terminal, and reference electrode are all connected to a constant potential controller. The constant potential controller, anodes, copper sulfate solution within the evaporator, and the evaporator body form a current loop.

[0006] A further technical solution is that the upper end of the anode is connected to the top of the copper sulfate evaporator.

[0007] A further technical solution is that the anode is a rod-shaped or tubular structure.

[0008] A further technical solution is that the anode is made of carbon steel or stainless steel.

[0009] A further technical solution is that the reference electrode is made of copper sulfate or zinc.

[0010] A further technical solution is that the number of anodes installed ranges from 1 to 6.

[0011] A further technical solution is that the number of reference electrodes installed ranges from 1 to 4.

[0012] (3) Due to the adoption of the above technical solution, the beneficial effects of this utility model are as follows: by setting several anodes in the copper sulfate evaporator, the anodes are inserted into the copper sulfate solution in the copper sulfate evaporator, and the anode, cathode terminal and reference electrode are all connected to the constant potential controller, so that the constant potential controller, anode, copper sulfate solution in the copper sulfate evaporator and copper sulfate evaporator body form a current loop, the controller outputs DC power, and the protection potential of the equipment is changed by automatically controlling the magnitude of the output DC power until the equipment potential reaches the protection potential in the range of -0.1 to -0.6V, the cathodic protection anti-corrosion technology is applied to the copper sulfate evaporator to prevent uniform corrosion and pitting of the equipment material in the copper sulfate solution due to high temperature dilute sulfuric acid and high concentration of chloride ions, thereby reducing the corrosion rate and improving the service life. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the overall structure of this utility model; Detailed Implementation

[0014] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments.

[0015] like Figure 1 As shown, a cathodic protected copper sulfate evaporator 7 is provided with a material inlet 8, a material outlet 9, and a steam outlet 6. Several anodes 5 are provided inside the copper sulfate evaporator 7, and the anodes 5 are inserted into the copper sulfate solution inside the copper sulfate evaporator 7. A cathode terminal 3 is provided on the outer wall of the copper sulfate evaporator 7, and a reference electrode 2 is provided on the outer wall of the copper sulfate evaporator 7. The anodes 5, cathode terminal 3, and reference electrode 2 are all connected to a constant potential controller 4. The constant potential controller 4, anodes 5, copper sulfate solution inside the copper sulfate evaporator 7, and the copper sulfate evaporator 7 body form a current loop.

[0016] In operation, the high-efficiency copper sulfate evaporator 7 is a key piece of equipment in the copper sulfate production unit. The evaporator body is perforated using plasma cutting. The anode 5 is installed from the top end of the evaporator and inserted into the solution. Because a uniform current distribution on the inner wall of the evaporator is necessary to achieve corrosion prevention, the anode 5 is placed in the copper sulfate solution. The number of anodes 5 installed ranges from 1 to 6, depending on the size of the equipment. The reference electrode 2 is installed from the side of the evaporator, with the number ranging from 1 to 4 depending on the equipment specifications. The reference electrode 2 is designed in a rod shape. The controller is installed at the production site, within 50 meters of the evaporator, and the surrounding environment must be clean and non-corrosive to prevent damage to the controller and ensure its stable and normal operation. The controller's input power is 220V, 50Hz AC, with an output current range of 10–100A and an output voltage range of 5–10V DC. A power cable connects the constant potential controller 4 to the copper sulfate evaporator 7, the anode 5, and the copper sulfate solution inside the evaporator, forming a current loop. Support bracket 1 supports the high-efficiency copper sulfate evaporator 7. The system operates at temperatures between 40 and 120°C. Because the high-efficiency copper sulfate evaporator contains a highly corrosive medium with a pH of 0-6 and a chloride ion concentration of 100-20000 ppm, the welding quality of the electrode base is critical. During electrode installation, the sealing surfaces must be checked for integrity, and installation must be carefully performed according to the steps to prevent leakage of the corrosive medium. Compared to existing technologies, the above technical solution effectively reduces pitting corrosion caused by high concentrations of dilute sulfuric acid and chloride ions in the copper sulfate solution, extends the service life of the equipment, reduces maintenance costs, and ultimately helps enterprises reduce costs and increase efficiency.

[0017] The operating steps for using this device are as follows:

[0018] (1) According to Figure 1 As shown, the reactants are fed into the equipment, and the evaporator starts working to keep it circulating.

[0019] (2) The copper sulfate solution is heated to boiling point, generating a large amount of steam, and the copper sulfate gradually concentrates. The steam generated then leaves through steam outlet 6, while the concentrated copper sulfate solution is discharged from material outlet 9.

[0020] (3) The anode 5 forms a current loop with the inner wall of the evaporator (the protected body) through the solution. The constant potential controller 4 outputs DC power to make the inner wall of the evaporator cathodic polarization. The reference electrode 2 reads the corrosion potential value of the equipment. The protection potential of the equipment is changed by automatically controlling the magnitude of the output DC power until the equipment potential reaches the protection potential range of -0.1 to -0.6V.

[0021] The upper end of the anode 5 is connected to the top of the copper sulfate evaporator 7. The anode 5 has a rod-shaped or tubular structure. The anode 5 is made of carbon steel or stainless steel. The reference electrode 2 is made of copper sulfate or zinc. The number of anodes 5 installed ranges from 1 to 6. The number of reference electrodes 2 installed ranges from 1 to 4.

[0022] The above are merely preferred embodiments of this utility model.

Claims

1. A cathodically protected copper sulfate evaporator, a copper sulfate evaporator (7) is provided with a material inlet (8), a material outlet (9) and a steam outlet (6), characterized in that, The copper sulfate evaporator (7) is provided with a plurality of anodes (5), the anodes (5) are inserted into the copper sulfate solution in the copper sulfate evaporator (7), the outer wall of the copper sulfate evaporator (7) is provided with a cathode terminal (3), the outer wall of the copper sulfate evaporator (7) is provided with a reference electrode (2), the anodes (5), the cathode terminal (3) and the reference electrode (2) are connected to a constant potential controller (4), the constant potential controller (4) outputs direct current with current 10-100A and voltage 5-10V, the constant potential controller (4), the anodes (5), the copper sulfate solution in the copper sulfate evaporator (7), the copper sulfate evaporator (7) body form a current loop.

2. A cathodically protected copper sulfate evaporator according to claim 1, characterized in that, The upper end of the anode (5) is connected with the top of the copper sulfate evaporator (7).

3. The cathodically protected copper sulfate evaporator of claim 1, wherein, The anode (5) is rod-shaped or tubular structure.

4. A cathodically protected copper sulfate evaporator according to claim 3, characterized in that, The anode (5) is carbon steel or stainless steel material.

5. The cathodically protected copper sulfate evaporator of claim 3, wherein, The reference electrode (2) is selected from copper sulfate or zinc material.

6. A cathodically protected copper sulfate evaporator according to claim 3, characterized in that, The installation number of the anode (5) ranges from 1 to 6.

7. A cathodically protected copper sulfate evaporator as claimed in claim 3, wherein, The installation number of the reference electrode (2) ranges from 1 to 4.

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