CN100396819C - Apparatus and method for cathodic protection in an environment where a thin film corrosive fluid is formed - Google Patents

Abstract

An apparatus for cathodic protection in an environment where a thin film corrosive fluid is formed, comprising: a DC power supply having a cathode electrically connected to an object to be corrosion-protected; and an anode assembly, the anode being electrically connected to a direct current power source. The anode assembly includes: an insulating filter member through which an etching fluid flows, the insulating filter member having an accommodating space formed therein; an anode member housed in the insulating filter member; an electrode lead electrically connecting the direct current power source to the anode member; an absorbing conductive member accommodated in the insulating filter member, surrounding the outer periphery of the anode member, and absorbing the corrosive fluid flowing along the exposed surface of the object to be corrosion-protected; a support member coupled to the exposed surface such that the support member stands and is disposed on the exposed surface of the object to be corrosion-protected, and the support member supports the anode member so as to be spaced apart from the exposed surface; and an insulating connection member having a through-hole formed in a central region thereof in a length direction, through which the electrode lead passes, both ends of the through-hole being detachably coupled with the support member and the end of the anode member.

Description

Apparatus and method for cathodic protection in environments with thin film corrosive fluids

technical field

This invention relates to apparatus and methods for cathodic protection in environments where thin film corrosive fluids are formed, and more particularly to an apparatus and method for corrosion protection of objects also exposed to hot and humid petroleum gas family corrosive fluids.

Background technique

Almost all metallic materials used in industry are extracted from raw ore and restored to their original state over time. In this way, over time, the metallic materials used to construct industrial structures or buildings react with the environment and inevitably corrode or oxidize. This kind of corrosion is mainly produced by the electrochemical reaction caused by the movement of electrons, so it is called electrochemical corrosion. The metal structure is in a corrosion cell state as corrosion progresses, thereby generating a corrosion potential, and a predetermined corrosion current flows through the metal structure.

In general, corrosion protection is the removal or suppression of one or more conditions from the main cause of corrosion. Electrical protection is a method to inhibit the corrosion of equipment or structures mainly by artificially adjusting the potential or current of equipment or structures that require corrosion protection. Electrical protection includes anodizing (anodizing) the object to be protected from corrosion and cathodic protection (cathodizing) the object to be protected from corrosion. In the case of anodic protection, corrosion is accelerated when the potential adjustment is imprecise. Therefore, anodic protection is used under certain conditions, but cathodic protection is generally used.

Cathodic protection is a method of preventing corrosion by artificially lowering the potential of the object being protected from corrosion. Cathodic protection is divided into sacrificial anode method and external power supply method according to the way of applying anti-corrosion current. In the sacrificial anode method, an easily ionized metal is electrically connected in an electrolyte to serve as an anode, thereby cathodicizing the object to be protected against corrosion. In the external power supply method, the cathode (-) of the DC power supply or rectifier is connected to the object to be protected from corrosion, and the anode (+) of the DC power supply or rectifier is connected to the cathode part, thereby obtaining the corrosion protection current.

Meanwhile, exhaust gas generated from combustion facilities such as steam power plants and incinerators, or sulfide contained in hot and humid gas generated in general chemical plants is converted into sulfurous acid gas through the following reaction.

SO ₂ +O ₂ →SO ₃ +O

Sulfurous acid gas reacts with water below the dew point and is equilibrated as H ₂ -SO ₃ -H ₂ SO ₄ . In addition, sulfurous acid gas condenses on the metal surface below the dew point lower than the dew point of the flowing gas generated on the bottom surface, wall or ceiling of the equipment that discharges petroleum gas, and exists in the form of a thick and thin film of high-concentration sulfur solution. Sulfur solutions cause severe corrosion of materials such as high alloy steels and coatings on a basis during equipment startup and shutdown. In addition, sulfur solutions cause noxious gases to leak out of corroded and damaged equipment and cause serious environmental problems. Thus, direct desulfurization equipment is made of high-priced special corrosion-resistant alloys. However, direct desulfurization equipment is prone to corrosion in the hot and humid environment that is characteristic of concentrated sulfuric acid and exhaust gas equipment. Since the equipment is frequently shut down for maintenance, the economical efficiency in the operation of the equipment is reduced, and, for maintenance, high-priced special corrosion-resistant alloys or linings should be repeatedly used, resulting in many additional costs. Therefore, if the aforementioned electrical protection is carried out in the desulfurization equipment, the corrosion of the desulfurization equipment can be prevented. As a result, maintenance costs can be reduced and inferior materials can be used in desulfurization equipment instead of high-priced specialty corrosion-resistant alloys. In this way, construction costs can also be reduced.

However, conventional electrical protection devices and methods can be used in various fields, such as buried pipelines, marine facilities, shipping equipment, and power plant cooling systems. However, conventional devices and methods for electrical protection can only be used in environments where sacrificial anode components or insoluble anode components are completely immersed in corrosive fluids. Thus, conventional devices and methods for electrical protection cannot be used in environments where film-forming corrosive fluids are formed, such as pipelines of desulfurization equipment. In addition, in conventional devices and methods for electrical protection, due to high conductivity, such as the case where the corrosion fluid is a sulfur solution as a waste solution flowing through the pipelines of desulfurization equipment, if electrical protection is performed, the resistance to corrosion current Consumption increases. In addition, when an object to be protected against corrosion is used in an environment that changes rapidly with time, and the position of the object in the environment is not constant, it is not easy to determine the anti-corrosion current or potential. Thus, it is difficult to use conventional devices and methods for electrical protection of metal structures such as pipelines of desulfurization equipment.

Contents of the invention

The present invention provides an apparatus and method for cathodic protection in an environment in which a thin film of corrosive fluid is formed, even when the object to be protected from corrosion is continuously in contact with a highly corrosive corrosive fluid and is not completely immersed in the corrosive fluid, For example, in the pipeline of desulfurization equipment, the device and method can also provide sufficient current required for electrical protection, so that the service life of the object to be protected from corrosion is significantly extended.

The present invention also provides an apparatus and method for cathodic protection in an environment where a thin-film corrosive fluid is formed, even if the corrosive fluid is, for example, a sulfur solution as a waste solution flowing through a pipeline of a desulfurization plant due to high electrical conductivity, and When the object to be protected against corrosion is used in an environment that changes rapidly over time, and the position of the object in the environment is not constant, the device and method can also perform electrical protection cost-effectively, when the corrosive fluid is In the case of the sulfur solution as the waste solution flowing through the pipes of the desulfurization equipment, if the conventional electrical protection method is performed, the consumption of anti-corrosion current increases.

According to one aspect of the present invention, there is provided an apparatus and method for cathodic protection in an environment where a thin film corrosive fluid is formed, which protects an object exposed to the thin film corrosive fluid from being corroded by manually adjusting the potential of the object, so that The device includes: a DC power supply, the cathode of which is electrically connected to the object to be protected from corrosion; and an anode assembly, the anode of which is electrically connected to the DC power supply. The anode assembly includes: an insulating filter member through which the corrosive fluid flows and a receiving space formed inside the insulating filter member; an anode member housed in the insulating filter member; and an electrode lead electrically connecting a DC power source to the anode member an absorbing conductive member, housed in an insulating filter member, surrounding the periphery of the anode member, and absorbing corrosion fluid flowing along an exposed surface of an object to be protected against corrosion; a support member, said support member being bonded to said exposed surface , so that the support member is erected and arranged on the exposed surface of the object to be protected from corrosion, and the support member supports the anode member to be spaced apart from the exposed surface; A through hole is formed in the central area of the member through which the electrode lead wire passes, and both ends of the through hole are detachably combined with the supporting member and the ends of the anode member.

Preferably, the anode member comprises a tubular anode member arranged parallel to the exposed surface of the object to be protected against corrosion, and a plate-shaped anode member bonded to the outer periphery of said tubular anode member. In this way, the anode piece has a sufficiently large area to be in contact with the corrosive fluid.

Meanwhile, it is preferable that, in mounting other than welding, the anode assembly further includes an engaging joint portion which holds the end of the electrode lead and engages with the inner circumference of the tubular anode member so that the end of the electrode lead contacts the tubular anode member inner week.

Here, it is also preferable that the engaging coupling portion includes: a holder supporting an end of an electric wire lead and having a large diameter portion inserted into the inside of the tubular anode member so that the end of the electrode lead contacts the inner periphery of the tubular anode member , and a small-diameter portion whose outer diameter is smaller than that of the large-diameter portion, and a screw hole is formed in the small-diameter portion; and a diameter-expanding part, which is provided on the outer periphery of the small-diameter portion of the holder Move back and forth to the large diameter portion of the holder, and have a plurality of elastic members arranged at intervals from each other in the circumferential direction on one of the ends of the enlarged diameter member; The screw hole combination of the diameter part in which the enlarged diameter part is placed between the screw part and the holder, the screw part is enlarged by pressing the diameter enlarged part toward the large diameter part and moving forward while rotating in the engaging direction of the screw hole The diameter of the elastic member expands the diameter of the portion and remains in contact with the inner periphery of the tubular anode member.

The anode assembly also includes an insulating thin plate inserted between the surface of the object to be protected from corrosion and the insulating filter member, and located in a partial area where the penetrating contact hole is formed, thereby significantly preventing the anode member from being damaged when the anode member is damaged. Contact with exposed surfaces of objects being protected from corrosion.

Preferably, the insulating filter element is a non-woven lining and the absorbing conductive element is char slag.

According to another aspect of the present invention, there is provided a method for cathodic protection in an environment where a thin film corrosion fluid is formed, which protects an object exposed to the thin film corrosion fluid from being corroded by manually adjusting the potential of the object, said The method includes: providing an anode assembly having an anode member electrically connected to a DC power source; mounting the anode assembly on an exposed surface of an object to be corrosion protected such that the anode member is in and electrically connect the cathode of the DC power supply to the object to be protected against corrosion; form a resin coating on said exposed surface by applying an acid-resistant and heat-stable resin coating material; and conduct current flow at the anode flow between the part and the anode.

Here, the varnish layer is further formed between the exposed surface of the object to be protected from corrosion and the resin coating.

In addition, the anode assembly further includes: an insulating filter member through which the corrosive fluid flows, and the insulating filter member accommodates the anode member in an accommodating space formed inside thereof; an electrode lead electrically connects a DC power source to the anode member and an absorbing conductive member housed in an insulating filter member surrounding the periphery of the anode member and absorbing corrosive fluid flowing along the exposed surface of the object to be protected from corrosion, also including exposed surfaces that will surround the object to be protected from corrosion The corrosive fluid flowing on the surface is absorbed into the conductive part. In this way, even when the object to be protected against corrosion is continuously in contact with a highly corrosive corrosion fluid and is not completely immersed in the corrosion fluid, sufficient current required for electrical protection can be provided.

At the same time, the object to be protected from corrosion is the pipeline in the desulfurization equipment, and the corrosion fluid is sulfuric acid solution.

In addition, the resin coating material used for the resin coating is elastomer.

Description of drawings

The above and other aspects and advantages of the present invention will become more apparent through the detailed description of preferred embodiments thereof with reference to the accompanying drawings.

Fig. 1 is the schematic diagram of the device that is used for cathodic protection in the environment that forms film corrosion fluid according to the present invention;

Figure 2 is a cross-sectional view of the anode assembly of Figure 1;

Fig. 3 is the plan view of the anode part of Fig. 2, is used for illustrating the state that tubular anode part and plate type anode part are combined with each other;

Fig. 4 shows the state of Fig. 2, wherein the anode member is combined with the engaging joint portion for connecting the electrode lead;

Figure 5 is a cross-sectional view of the support of Figure 2; and

FIG. 6 is a perspective view of the insulating connector of FIG. 2 .

Detailed ways

Hereinafter, the present invention will be described in detail by describing preferred embodiments of the invention with reference to the accompanying drawings.

FIG. 1 is a schematic diagram of an apparatus for cathodic protection in an environment of thin film corrosive fluids according to the present invention. As shown in Figure 1, the cathodic protection system 2 includes a DC power supply, the anode of which is connected to the anode assembly 1, and the cathode is connected to the object 3 to be protected against corrosion; and a potential measuring unit (not shown), which is electrically connected to to the reference electrode 5 and to the object 3 to be protected against corrosion. The cathodic protection system 2 uses the potential measuring unit to measure the potential of the object 3 to be protected against corrosion relative to the reference electrode 5, and sets the output of the DC power supply according to the measured potential to make the predetermined anti-corrosion current from the DC power supply flow from the cathode assembly 1 The anode member 22 flows through the corrosion-protected object 3 via the corrosion fluid 4 (to be described later), thereby performing corrosion protection of the corrosion-protected object 3 . Here, a resin coating 6 coated with a fluororubber or ceramic-reinforced coating material is formed on the surface of the corrosion-protected object 3 exposed to the corrosion fluid 4 . The resin coating 6 substantially protects the object 3 to be protected against corrosion. When the resin coating 6 is damaged by natural or mechanical deterioration, the damaged part of the resin coating 6 is strengthened and protected by the anti-corrosion current, thereby consuming a small amount of current, the range of the anti-corrosion current becomes larger, and the object protected by corrosion 3 can be effectively protected against corrosion. In this way, even when the corrosive fluid is the concentrated water of desulfurization equipment, that is, when the pH value is very low, the concentration of sulfuric acid is high and the conductivity is high, electrical protection can be effectively carried out.

For ease of illustration, in FIG. 1, the anode assembly 1 is not completely immersed in the corrosion fluid 4, but absorbs the corrosion fluid 4 by continuous contact with the corrosion fluid 4 flowing along the exposed surface of the object 3 being corrosion protected, sufficient The corrosive fluid 4 is present in the anode assembly 1 and the object 3 to be protected from corrosion.

FIG. 2 is a cross-sectional view of the anode assembly of FIG. 1 . As shown in Figure 2, the anode assembly 1 includes an insulating filter element 10, through which the corrosive fluid flows, and forms an accommodating space inside the insulating filter element 10; an anode element 20 accommodated in the insulating filter element 10; an electrode lead 25 , which electrically connects a DC power source (not shown) to the anode member 20; the absorbing conductive member 40, which is accommodated in the insulating filter member 10, surrounds the periphery of the anode member 20, and absorbs the The corrosive fluid flowing on the exposed surface 3a; the insulating thin plate 50, which is inserted between the surface of the object 3 to be protected from corrosion and the insulating filter 10; the support 60, which is combined with the exposed surface 3a, so that the support 60 is erected and arranged On the exposed surface 3a of the object 3 being protected from corrosion, and supporting the anode part 20 so that it is spaced apart from the exposed surface 3a; combined.

The insulating filter 10 forms a housing space inside it, and is a non-woven fabric lining. When the corrosive fluid flows through the insulating filter 10 , the corrosive fluid passes through the insulating filter 10 and is absorbed into the absorbing conductive member 40 . In this way, the insulating filter 10 performs an insulating function.

FIG. 3 is a plan view of the anode member of FIG. 2, illustrating a state in which a tubular anode member and a plate-type anode member are combined with each other. Referring to FIG. 3 in conjunction with FIG. 2, an anode member 20 made of titanium and coated with a noble metal oxide comprises: a tubular anode member 21 having a tubular shape arranged parallel to the exposed surface 3a of the object 3 to be protected against corrosion; and a plate-type anode member 23, which has a plate shape combined with the outer periphery of the tubular anode member 21. The tubular anode member 21 is combined with the electrode lead 25 and the engaging joint portion 30 so that the electrode lead 25 is not exposed and connected to the anode member 20 . Since the plate-type anode member 23 has a sufficiently large area to be in contact with the corrosion fluid, a large amount of corrosion current supplied to the plate-type anode member 23 is supplied to the object 3 to be corrosion-protected via the corrosion fluid. Meanwhile, the length of the tubular anode member 21 is greater than that of the plate-shaped anode member 23 .

The electrode lead 25 is connected to a DC power source (not shown), and electrically connects the anode member 20 to the DC power source. The electrode lead 25 is connected to the tubular anode member 21 through the engaging joint portion 30 .

FIG. 4 shows the state of FIG. 2, in which the anode member is combined with the engaging joint portion for connecting the electrode lead. As shown in FIG. 4 , the engaging joint portion 30 includes: a holder 31 that holds the end of the electrode lead 25; a diameter-enlarged portion 33 that has a plurality of elastic springs that are spaced apart from each other in the circumferential direction on one end thereof. member 33a; a screw member 35, which is combined with the holder 31, wherein the enlarged diameter portion 33 is placed between the screw member 35 and the holder 31; and a washer member 34, which is arranged between the screw member 35 and the enlarged diameter portion 33 .

The holder 31 includes: a large-diameter portion 31a supporting the end of the electrode lead 25; a small-diameter portion 31c having an outer diameter smaller than that of the large-diameter portion 31a and having a screw hole 31d formed therein; and an inclined portion 31b , which connects the large diameter portion 31a to the small diameter portion 31c. The enlarged-diameter part 33 moves back and forth on the outer periphery of the small-diameter portion 31 c of the holder 31 to the large-diameter portion 31 a of the holder 31 . When the diameter enlarging member 33 moves forward to the large diameter portion 31a, the end at the elastic member 33a moves to the inclined portion 31b, so that the diameter of the elastic member 33a is enlarged. When the diameter of the elastic piece 33 a of the diameter expanding member 33 is enlarged, the elastic piece 33 a closely adheres to the inner periphery of the tubular anode member 21 and remains in contact with the tubular anode member 21 . When the screw member 35 is engaged with the screw hole 31 d of the holder 31 , the forward movement of the diameter expanding member 33 to the holder 31 is performed, wherein the diameter expanding member 33 is interposed between the holder 31 and the screw member 35 . A washer member 34 is provided between the screw member 35 and the enlarged-diameter member 33 . When the enlarged diameter member 33 contacts the inner periphery of the tubular anode member 21 , the electrode lead 25 penetrating the holder 31 remains in contact with the inner periphery of the tubular anode member 21 . In this way, the electrode lead 25 can be conveniently connected to the anode member 20 without welding. When a plurality of anode assemblies are installed, a part of the electrode lead 25 contacts the tubular anode member 21, and the other part of the electrode lead 25 is extended and pulled out toward the same screw member 35, and is connected to the tubular anode member of another anode assembly superior. For this purpose, the shapes of the enlarged diameter portion 33 and the screw member 35 should be slightly changed. After the electrode lead 25 is connected to the anode member 20 using the engaging joint 30, the interior of the tubular anode member 21 is completely sealed with an acid-resistant and heat-stable seal (not shown).

The absorbing conductive member 40 accommodated in the insulating filter member 10 to surround the anode member 20 is coke slag. Coke residue can absorb corrosive fluids and is a conductive material.

The insulating sheet 50 prevents the anode element 20 from coming into direct contact with the exposed surface 3a of the object 3 to be protected against corrosion when the anode element 20 is broken. The insulating sheet 50 is made of Teflon. The penetrating contact hole 50a is formed in a partial area of the insulating sheet 50 so that the corrosion material absorbed into the absorbing conductive member 40 contacts the exposed surface 3a of the object 3 to be corrosion protected. Meanwhile, a cover 65 is installed on top of the insulating filter 10 .

The support 60 is welded to the exposed surface 3a of the object 3 to be protected from corrosion, using the same metal material as the object 3 to be protected from corrosion.

FIG. 5 is a cross-sectional view of the support of FIG. 2 . As shown in FIG. 5 , the support member 60 includes: an insulating hole 62 in which the end of the insulating connector 70 is installed; and an insertion hole 61 through which the end of the insulating connector 70 is installed in the insulating hole 62 . The channel short pipe portion 63 is formed at the lower end of the support 60 so that the corrosion fluid is not intercepted by the support 60 and flows through the support 60 . However, when the support 60 is installed on the side wall of the exhaust gas duct, the lower portion of the support 60 is completely blocked, so that the corrosive fluid cannot flow and leak. In this way, the corrosive fluid flowing along the wall of the exhaust gas pipe stays in the support member 60, so that the anode member 20 is sufficiently contacted with the corrosive fluid, and current cannot be smoothly supplied.

FIG. 6 is a perspective view of the insulating connector of FIG. 2 . As shown in FIG. 6 , a protrusion 71 is provided on one side of the insulating connector 70 . The end of the tubular anode piece 21 is inserted on the opposite side into the protrusion 71 of the insulating connector 70 which engages and fits in the insulating hole 62 of the support 60 . Since the insulating connection 70 is made of Teflon, the anode piece 20 remains insulated and supported from the support 60 made of the same material as the object 3 to be protected against corrosion. The insulating connector 70 may be made of plastic.

Based on the above structure, a method for cathodic protection in an environment where a thin film corrosion fluid is formed according to the present invention will be described below.

First, an anode assembly 1 is provided having an anode member 22 electrically connected to a DC power source. The anode assembly 1 may use only the anode member 22 as long as the anode member 22 is sufficiently buried in the corrosive fluid. However, in an environment where a thin film of corrosive fluid 4 is formed, the anode assembly 1 should include an absorbing conductive member 24 so that the corrosive fluid 4 flowing around the surface of the object 3 to be protected from corrosion is absorbed into the absorbing conductive member 24 and sufficient A quantity of corrosion fluid 4 is present between the anode part 22 and the object 3 to be protected from corrosion.

Next, the anode assembly 1 is installed on the exposed surface of the object 3 to be protected from corrosion, exposed to the corrosion fluid 4, so that the anode member 22 is spaced from the exposed surface of the object 3 to be protected from corrosion, and the anodic analysis of the DC power supply (-) is electrically connected to the object 3 to be protected against corrosion. The quantity and arrangement of the anode assemblies 1 should be determined according to site investigation and reproduction test. Depending on site conditions, the anode assembly 1 may be installed by connecting a single electrode lead 23 or by connecting three or five electrode leads 23 to each other. When the object 3 to be protected against corrosion is a pipe, the anode assembly 1 is installed inside the pipe so that the cathode of the DC power supply is connected in a suitable position outside the pipe. In this case, the electrode lead 23 and the corrosion-protected object 3 are connected by welding, and the welded portion of the electrode lead 3 and the corrosion-protected object 3 is insulated.

Subsequently, a resin coating 6 is formed on the exposed surface of the object 3 to be protected against corrosion by applying an acid-resistant and heat-stable resin coating material, such as in this embodiment Viton or a ceramic reinforced coating material. In this way, fluororesins are used in extremely corrosive environments such as piping in desulfurization equipment. Fluorine resin is a synthetic polymer resin containing fluorine (F) in the molecule, and has excellent thermal stability, chemical resistance, wear resistance, electrical insulation, high frequency, non-sticky low friction coefficient and wettability. It is preferable that the ceramic-reinforced coating material is a particle-reinforced composite coating material capable of corrosion resistance, erosion resistance and chemical resistance by mixing up to 90% of ceramic particles and acid-resistant resin.

Corrosion fluid flowing around the exposed surface of the object 3 to be corrosion protected is then absorbed into the absorbing conductive part 24 of the anode assembly 1 . When the anode member 22 is immersed in a corrosive fluid, direct electrical protection is not possible. However, when the thin-film high-concentration sulfuric acid solution is concentrated on the surface of the object 3 to be protected against corrosion and remains thereon, as in the piping of the desulfurization equipment, the absorption of the sulfuric acid solution into the anode assembly 1 is conductive. Electrical protection can be performed after being in the member 24 and staying around the anode member 22. In this case, the corrosive fluid absorbed into the absorbing conductive member 24 stays in the contact hole 25a of the insulating sheet 25, so that the anode member 22 and the corrosion-protected object 3 come into contact with the corrosive fluid.

Finally, an anti-corrosion current flows between the anode element 22 and the cathode, thereby performing corrosion protection on the corrosion-protected object 3 . However, the resin coating 6 substantially protects the object 3 to be protected against corrosion. Thus, when the resin coating 6 is formed on the entire exposed surface of the object 3 to be protected from corrosion, the corrosion-resistant fluid does not flow between the anode member 22 and the cathode. However, when the resin coating 6 is damaged by natural or mechanical wear, an anti-corrosion current flows between the anode member 22 and the cathode, thereby performing corrosion protection on the corrosion-protected object 3 . In this case, damage to the resin coating 6 can be detected by a potentiometric measuring unit (not shown) electrically connected to the reference electrode 5 and the object 3 to be protected against corrosion.

As described above, the anode assembly 1 includes the absorbing conductive member 40 which can absorb the corrosion fluid flowing through the exposed surface of the corrosion-protected object 3 so that even when the corrosion-protected object 3 is continuously When in contact with a highly corrosive corrosive fluid and not completely immersed in the corrosive fluid, as in the piping of desulfurization equipment, sufficient current required for electrical protection can also be supplied, and the object to be protected against corrosion 3 Lifespan can be significantly extended.

In the embodiment described above, the support 60 is welded to the exposed surface of the object 3 to be protected from corrosion, using the same material as the object 3 to be protected from corrosion. However, the support 60 may be made of an insulating material and may contact the exposed surface 3a. In this case, the insulating filter 10 can be fixed by the support 60 without constructing the insulating connection 70 .

In addition, in the above-described embodiment, the anode assembly 1 includes the support 60 , the insulating sheet 50 and the cover 65 . However, this configuration is for stability and maintenance. In this way, even if the anode assembly 1 does not include these components, the effect of the present invention can be achieved.

In addition, in the above-described embodiment, the resin coating 6 is formed after the anode assembly 1 is installed and the cathode of the DC power supply is connected to the object 3 to be protected from corrosion. However, the order of the above two steps can be reversed. The anode assembly 1 may consist of the anode part 22 if the anode part 22 is completely immersed in the corrosive fluid. In this case, the step of absorbing the corrosive fluid into the absorbing conductive part 24 of the anode assembly 1 is not required.

In addition, in the above-described embodiment, no varnish layer is formed in the piping of the desulfurization equipment as the object 3 to be protected against corrosion. However, even if the coating is formed in the piping of the desulfurization equipment and the resin coating 6 is formed on the paint layer, electrical protection can be performed.

Industrial applicability

As described above, in the apparatus and method for cathodic protection in an environment where a thin-film corrosion fluid is formed according to the present invention, even when the object to be corrosion-protected is continuously in contact with a highly corrosive corrosion fluid and is not completely immersed in corrosion When in the fluid, just like in the pipeline of desulfurization equipment, it can also provide sufficient current for electrical protection, so that the life of the object being protected from corrosion is also significantly extended.

In addition, in the method for cathodic protection in an environment where a thin-film corrosion fluid is formed according to the present invention, even if the corrosion fluid is in contact with an object to be corrosion-protected as it flows through the desulfurization equipment due to high electrical conductivity The sulfur solution of the waste solution of the pipeline, and the object to be protected by corrosion are used in an environment that changes rapidly over time, and the position of the object in the environment is not constant, and it can also be economically and effectively protected electrically. In the case where the corrosion fluid is a sulfur solution that is a waste solution flowing through the pipes of the desulfurization equipment, if the conventional electrical protection method is performed, the consumption of corrosion current increases.

Although the invention has been particularly shown and described with reference to preferred embodiments, it should be understood by those skilled in the art that various modifications may be made to the embodiments without departing from the spirit and scope of the invention as defined by the claims. changes in form and detail.

Claims (12)

1. device that in forming the environment of thin film corrosive fluids, is used for galvanic protection, it protects described object to avoid being corroded by the electromotive force that manual shift is exposed to the object in the thin film corrosive fluids, and described device comprises:

Direct supply, the cathodic electricity of this direct supply is connected to the object that is carried out corrosion protection; With

Anode assemblies, its anode is electrically connected to direct supply;

Wherein, described anode assemblies comprises: the insulation filter member, and corrosive fluids flows through this filter member, and, form spatial accommodation in the inside of insulation filter member; Be contained in the anode member in the insulation filter member; Contact conductor, it is electrically connected to anode member with direct supply; Absorb electric-conductor, it is contained in the insulation filter member, and around the periphery of anode member, and absorption is along the exposed surface mobile corrosive fluids of the object that is carried out corrosion protection; Strut member, described strut member combines with described exposed surface, thereby described strut member erect and be arranged on the exposed surface of the object that is carried out corrosion protection, and described supports support anode member makes itself and described exposed surface spaced apart; And insulated connecting piece, wherein, in the central zone of insulated connecting piece, forming through hole along its length, contact conductor is by this through hole, and the two ends of through hole removably combine with the end of strut member and anode member.

2. device according to claim 1 is characterized in that, described anode member comprises the sheath spare of the exposed surface layout that is parallel to the object that is carried out corrosion protection.

3. device according to claim 2 is characterized in that, described anode member also comprises the periphery bonded template anode member with described sheath spare.

4. device according to claim 2, it is characterized in that, described anode assemblies also comprises the engagement part, this engagement partly keep contact conductor the end and with the interior week engagement of sheath spare so that the interior week of the end of contact conductor contact tubulose anode member.

5. device according to claim 4 is characterized in that, described engagement partly comprises:

Keeper, the end of its supporting electric wire lead-in wire, and has the major diameter part of insertion tubulose anode member inside so that the interior week and the small diameter portion of the end of contact conductor contact tubulose anode member, the external diameter of described small diameter portion is less than the external diameter of major diameter part, and forms screw hole in small diameter portion;

The enlarged-diameter parts, before and after being provided on the periphery of small diameter portion of keeper, it moves to the major diameter part of keeper, and have a plurality of elastic components, described a plurality of elastic components on one of end of enlarged-diameter parts along the circumferential direction each interval arrange; And

Screw part, its screw hole with the small diameter portion of keeper combines, wherein enlarged-diameter partly is placed between screw part and the keeper, described screw part is by towards large-diameter portion dividing potential drop enlarged-diameter parts and move forward the diameter of the elastic component of enlarged diameter expansion section s along the rotation of the engagement direction of screw hole the time, and the contacting in interior week of maintenance and sheath spare.

6. device according to claim 1 is characterized in that described anode assemblies also comprises insulating thin, and described insulating thin inserts the object surfaces that is carried out corrosion protection and insulate between the filter member and be arranged in and forms the subregion that penetrates contact hole.

7. device according to claim 1 is characterized in that, described insulation filter member is the nonwoven fabric liner, and described absorption electric-conductor is a breeze.

8. method that in forming the environment of thin film corrosive fluids, is used for galvanic protection, it protects described object to avoid being corroded by the electromotive force that manual shift is exposed to the object in the thin film corrosive fluids, and described method comprises:

Anode assemblies is provided, and described anode assemblies has the anode member that is electrically connected to direct supply;

Described anode assemblies is installed on the exposed surface of the object that is carried out corrosion protection,, and the cathodic electricity of direct supply is connected on the object that is carried out corrosion protection so that anode member is spaced apart with the exposed surface of the object that is carried out corrosion protection;

On described exposed surface, form resin coating by applying acidproof and heat stable resin coated material; And

Electric current is flowed between anode member and anode.

9. method according to claim 8 is characterized in that, enamelled coating further is formed between the exposed surface and resin coating of the object that is carried out corrosion protection.

10. method according to claim 8 is characterized in that, described anode assemblies also comprises: the insulation filter member, and corrosive fluids flows through this filter member, and, hold anode member in the described insulation filter member spatial accommodation that portion forms within it; Contact conductor, it is electrically connected to anode member with direct supply; And the absorption electric-conductor, it is contained in the insulation filter member, and around the periphery of anode member, and absorption is along the exposed surface mobile corrosive fluids of the object that is carried out corrosion protection; And

Also comprise and to absorb around the exposed surface mobile corrosive fluids that the thing that is carried out corrosion protection is stopped in the absorption electric-conductor.

11. method according to claim 8 is characterized in that, the described object that is carried out corrosion protection is the pipeline in the sweetener, and described corrosive fluids is a sulphuric acid soln.

12. method according to claim 8 is characterized in that, being used for resin-coated resin coating material is viton.

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