Device and method for preventing corrosion of circulating water cooler

Abstract

The invention relates to an anti-corrosion device and method for a circulating water cooler. The device comprises a metal shell, a sacrificial anode block and a connecting assembly. And the sacrificial anode block is connected to the end cover of the metal shell through the connecting assembly. The sacrificial anode block is additionally arranged on the end cover of the metal shell of the circulating water cooler, the sacrificial anode block and the end cover of the metal shell form a primary battery reaction, the principle that the sacrificial anode block protects a cathode is utilized, iron in the metal shell is prevented from reacting, corrosion of the metal surface of the circulating water cooler is effectively slowed down, and the service life of the circulating water cooler is prolonged. The service life of equipment is prolonged, and safe and stable operation of a unit is stabilized.

Description

Technical Field

[0001] The present invention relates to the field of anti-corrosion technology, and in particular to an anti-corrosion device and method for a circulating water cooler. Background Art

[0002] The material of circulating water system equipment is carbon steel. Carbon steel pipes contain silt, debris, rust, organic matter, etc. in the water, which will form bulges after local deposition. A micro-battery environment is formed inside the bulge, which corrodes the pipes, i.e., under-scale corrosion. For example, the end cover and surrounding areas of the cooler are prone to mud and scale deposition and under-scale corrosion. Under-scale corrosion can reduce the heat transfer efficiency of the cooler equipment, reduce the production capacity of the equipment, increase the resistance of the medium flow, and increase the energy consumption of the equipment; it can also shorten the service life of the equipment. In severe cases, it can cause equipment blockage, affect the smooth production of the device, and even cause shutdown.

[0003] At present, on the one hand, scale inhibitors and acid are added to the circulating water to prevent scaling factors such as calcium and magnesium in the water from scaling and corroding on the metal surface, but the addition of drugs to the circulating water can only prevent scaling and corrosion caused by ion concentration in the water body itself. On the other hand, periodic shutdown cleaning, such as chemical cleaning or high-pressure cleaning, is used for treatment, but it cannot solve the problems of low efficiency and under-scale corrosion caused by scaling during the operation of the cooler. Summary of the invention

[0004] The object of the present invention is to provide a device and method for preventing corrosion of a circulating water cooler, which can effectively slow down the corrosion and under-scale corrosion of the metal surface during the operation of the cooler.

[0005] In order to achieve the above objectives, the present invention provides, on one hand, a circulating water cooler anti-corrosion device, comprising a metal shell, a sacrificial anode block and a connecting assembly; the sacrificial anode block is connected to the end cover of the metal shell through the connecting assembly.

[0006] Optionally, the end cover of the metal shell is a circular structure, and the sacrificial anode block is connected to the center of the end cover of the metal shell through the connecting assembly.

[0007] Optionally, the connecting assembly includes a bolt, a first threaded hole and a second threaded hole, and the bolt is installed inside the second threaded hole.

[0008] Optionally, the first threaded hole is provided on the end cover of the metal shell, the second threaded hole is provided on the sacrificial anode block, the first threaded hole matches the second threaded hole; and the sacrificial anode block and the end cover are connected by the bolts.

[0009] Optionally, the connecting assembly includes a limit block, a first mounting hole and a second mounting hole, and the limit block is installed inside the second mounting hole.

[0010] Optionally, the first mounting hole is provided on the end cover of the metal shell, the second mounting hole is provided on the sacrificial anode block, the first mounting hole matches the second mounting hole; the sacrificial anode block and the end cover are welded and connected via the limiting block.

[0011] Optionally, the sacrificial anode block is a circular, square or rectangular structure.

[0012] Optionally, the sacrificial anode block is a zinc block, a magnesium block or an aluminum block.

[0013] Another aspect of the present invention provides a method for anti-corrosion of a circulating water cooler, the method comprising: connecting a sacrificial anode block to an end cover of a metal shell; the sacrificial anode block and the end cover of the metal shell respectively form the anode and cathode of a galvanic cell.

[0014] Optionally, the sacrificial anode block and the end cover are connected by bolts or by welding through a limit block; the sacrificial anode block is a zinc block, a magnesium block or an aluminum block.

[0015] Through the above technical scheme, the present invention adopts a method of installing a sacrificial anode block on the end cover of the metal shell of the circulating water cooler. The sacrificial anode block and the end cover of the metal shell form a galvanic cell reaction. The sacrificial anode block protects the cathode on the principle of preventing the iron in the metal shell from reacting, effectively slowing down the corrosion of the metal surface during the operation of the circulating water cooler, extending the service life of the equipment and stabilizing the safe and stable operation of the unit.

[0016] Other features and advantages of the present invention will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present invention but do not constitute a limitation of the present invention. In the accompanying drawings: Figure 1 is a schematic diagram of the end cover of the present invention before being connected to the sacrificial anode block; Figure 2 It is a schematic diagram of the end cover of the present invention connected to the sacrificial anode block one year later. DETAILED DESCRIPTION

[0018] The specific implementation of the present invention is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described here is only used to illustrate and explain the present invention, and is not used to limit the present invention.

[0019] Corrosion is a special form of local corrosion. Its mechanism is that due to the influence of equipment geometry, corrosion products and deposits, the flow of the medium on the metal surface and the diffusion of the dielectric are restricted, resulting in a great difference between the chemical composition of the medium in the blocked cavity and the overall medium. The pH value of the medium in the cavity changes significantly, the electrode potential decreases, and battery corrosion occurs.

[0020] Impurities such as slime carried in the water are easily deposited to form mud scale, causing corrosion under the cooler scale. The greater the mass concentration of oxygen in the solution, the greater the mass concentration difference between the water and scale phases, and the greater the potential difference between the positive and negative electrodes, and the easier it is for iron to react with oxygen to produce corrosion. Corrosion is mainly electrochemical corrosion. In the corrosion cell, the cathode reaction is mainly the reduction of oxygen, and the metal in the closed area under the scale is the anode. The anode reaction is the dissolution of iron. The corrosion reaction in water is: Anode reaction: Fe=Fe 2+ +2e; Cathode reaction: O 2 +2H 2 O+4e=4OH - .

[0021] After the anode reaction, the divalent iron is hydrolyzed, a large amount of iron oxide precipitation is produced in the water, and an oxygen concentration difference corrosion cell is established, thereby corroding the metal. Therefore, the under-scale corrosion of the metal is due to the self-catalytic effect of its own electrochemical corrosion, which accelerates the corrosion of the metal.

[0022] In order to effectively alleviate metal corrosion, the present invention provides a circulating water cooler anti-corrosion device on the one hand, including a metal shell, a sacrificial anode block and a connecting assembly; the sacrificial anode block is connected to the end cover of the metal shell through the connecting assembly.

[0023] According to the present invention, optionally, the end cover of the metal shell is a circular structure, and the sacrificial anode block is connected to the center of the end cover of the metal shell through the connecting assembly.

[0024] According to the present invention, optionally, the connection assembly includes a bolt, a first threaded hole and a second threaded hole, and the bolt is installed inside the second threaded hole.

[0025] According to the present invention, optionally, the first threaded hole is provided on the end cover of the metal shell, the second threaded hole is provided on the sacrificial anode block, the first threaded hole matches the second threaded hole, and the sacrificial anode block and the end cover are connected by the bolts. The bolt connection can facilitate the disassembly of the sacrificial anode block, and facilitate regular inspection and replacement to ensure the anti-corrosion effect.

[0026] According to the present invention, optionally, the connection assembly includes a limit block, a first mounting hole and a second mounting hole, and the limit block is installed inside the second mounting hole.

[0027] According to the present invention, optionally, the first mounting hole is provided on the end cover of the metal shell, the second mounting hole is provided on the sacrificial anode block, the first mounting hole matches the second mounting hole, and the sacrificial anode block and the end cover are welded and connected via the limit block. The connection of the sacrificial anode block can be reinforced by welding to prevent the sacrificial anode block from falling off and affecting the anti-corrosion effect.

[0028] According to the present invention, optionally, the sacrificial anode block is a circular, square or rectangular structure, so that the utilization rate of the sacrificial anode block is higher and the anti-corrosion effect is better achieved.

[0029] According to the present invention, optionally, the sacrificial anode block is a zinc block, a magnesium block or an aluminum block.

[0030] The present invention adopts the method of installing a sacrificial anode block on the end cover of the metal shell of the circulating water cooler. The sacrificial anode block and the end cover of the metal shell form a galvanic cell reaction. The sacrificial anode block protects the cathode on the principle of preventing the iron in the metal shell from reacting, effectively slowing down the corrosion of the metal surface of the circulating water cooler, extending the service life of the equipment and stabilizing the safe and stable operation of the unit. The installation is simple, fast and low-cost.

[0031] The principle of the sacrificial anode block protecting the cathode of the present invention is to place two metals with different electrode potentials in an electrolyte system. When a wire is connected, current will flow. At this time, the metal with a more negative electrode potential is the anode, which is electrically connected to the protected metal. The other metals are protected by the current generated by the continuous corrosion and dissolution of the metal with a more negative potential.

[0032] Another aspect of the present invention provides a method for anti-corrosion of a circulating water cooler, which uses the anti-corrosion device for a circulating water cooler provided by the present invention, and comprises: connecting a sacrificial anode block to an end cover of a metal shell; the sacrificial anode block and the end cover of the metal shell respectively form the anode and cathode of a galvanic cell. The sacrificial anode block of the anode is consumed, and the end cover of the cathode is protected, thereby protecting the metal shell of the cooler.

[0033] According to the present invention, optionally, the sacrificial anode block and the end cover are connected by bolts or by welding through a stop block; the sacrificial anode block is a zinc block, a magnesium block or an aluminum block. The zinc block, the magnesium block or the aluminum block has a more negative potential than iron, and is electrically connected to the protected metal iron. The metal matrix iron corroded by the under-scaling can be transferred to the more negative zinc block, the magnesium block or the aluminum block metal, thereby protecting the original metal matrix iron.

[0034] The present invention is further illustrated by the following examples, but the present invention is not limited thereto.

[0035] Example The anti-corrosion device for a circulating water cooler of this embodiment comprises a metal shell, a sacrificial anode block, a zinc block and a connection assembly, wherein the sacrificial anode block is connected to the center of the end cover of the metal shell through the connection assembly. The connection assembly comprises a limit block, a first mounting hole and a second mounting hole, wherein the first mounting hole is provided at the center of the end cover of the metal shell, and the second mounting hole matching the first mounting hole is provided on the zinc block, wherein the limit block is installed inside the second mounting hole, and the zinc block and the end cover are welded and connected through the limit block.

[0036] In this embodiment, a zinc block is welded on the end cover of the metal shell of the circulating water cooler, and the corrosion principle is as follows: Anode reaction: Zn=Zn 2+ +2e; Cathode reaction: O 2 +2H 2 O+4e=4OH - .

[0037] By adding zinc blocks to the metal surface, the anode formed by the metal surface (original anode) and the oxygen-deficient area under the scale is transferred to the zinc block, and the oxygen in the water and the water form a cathode area, which effectively slows down the corrosion of the metal surface and the corrosion under the scale. The metal surface condition of the cooler about one year after the zinc block was installed is as follows Figure 1 and Figure 2 As shown, it can be seen that the corrosion of the metal surface of the circulating water cooler is significantly slowed down, and a good anti-corrosion effect is achieved.

[0038] The preferred embodiments of the present invention are described in detail above in conjunction with the accompanying drawings. However, the present invention is not limited to the specific details in the above embodiments. Within the technical concept of the present invention, a variety of simple modifications can be made to the technical solution of the present invention, and these simple modifications all belong to the protection scope of the present invention.

[0039] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present invention will not further describe various possible combinations.

[0040] In addition, various embodiments of the present invention may be arbitrarily combined, and as long as they do not violate the concept of the present invention, they should also be regarded as the contents disclosed by the present invention.

Claims

1. A device for anti-corrosion of a circulating water cooler, characterized in that: It comprises a metal shell, a sacrificial anode block and a connecting assembly; the sacrificial anode block is connected to the end cover of the metal shell through the connecting assembly.

2. The device according to claim 1, wherein: The end cover of the metal shell is a circular structure, and the sacrificial anode block is connected to the center of the end cover of the metal shell through the connecting assembly.

3. The device according to claim 1, wherein: The connecting assembly includes a bolt, a first threaded hole and a second threaded hole, wherein the bolt is installed inside the second threaded hole.

4. The device according to claim 3, wherein: The first threaded hole is provided on the end cover of the metal shell, the second threaded hole is provided on the sacrificial anode block, the first threaded hole matches the second threaded hole; the sacrificial anode block and the end cover are connected by the bolts.

5. The device according to claim 1, wherein: The connecting assembly comprises a limiting block, a first mounting hole and a second mounting hole, wherein the limiting block is mounted inside the second mounting hole.

6. The device according to claim 5, wherein: The first mounting hole is provided on the end cover of the metal shell, the second mounting hole is provided on the sacrificial anode block, the first mounting hole matches the second mounting hole; the sacrificial anode block and the end cover are welded and connected via the limiting block.

7. The device according to claim 1, wherein: The sacrificial anode block is a circular, square or rectangular structure.

8. The device according to claim 1, wherein: The sacrificial anode block is a zinc block, a magnesium block or an aluminum block.

9. A method for anti-corrosion of a circulating water cooler, characterized in that: The method comprises: connecting a sacrificial anode block to an end cover of a metal shell; the sacrificial anode block and the end cover of the metal shell respectively form an anode and a cathode of a primary cell.

10. The method according to claim 9, wherein: The sacrificial anode block and the end cover are connected by bolts or welding via a limit block; The sacrificial anode block is a zinc block, a magnesium block or an aluminum block.

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