CN117364087A - Corrosion prevention system and method for metal pipe network in seawater environment - Google Patents
Corrosion prevention system and method for metal pipe network in seawater environment Download PDFInfo
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- CN117364087A CN117364087A CN202311329148.5A CN202311329148A CN117364087A CN 117364087 A CN117364087 A CN 117364087A CN 202311329148 A CN202311329148 A CN 202311329148A CN 117364087 A CN117364087 A CN 117364087A
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- 239000013535 sea water Substances 0.000 title claims abstract description 163
- 229910052751 metal Inorganic materials 0.000 title claims abstract description 106
- 239000002184 metal Substances 0.000 title claims abstract description 106
- 238000000034 method Methods 0.000 title claims abstract description 26
- 238000005536 corrosion prevention Methods 0.000 title claims abstract description 23
- 238000005260 corrosion Methods 0.000 claims abstract description 39
- 230000007797 corrosion Effects 0.000 claims abstract description 34
- 238000001816 cooling Methods 0.000 claims abstract description 19
- 239000004568 cement Substances 0.000 claims abstract description 8
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 claims description 16
- 238000004210 cathodic protection Methods 0.000 claims description 11
- 239000002131 composite material Substances 0.000 claims description 8
- 229910052697 platinum Inorganic materials 0.000 claims description 8
- 238000007789 sealing Methods 0.000 claims description 8
- -1 polytetrafluoroethylene Polymers 0.000 claims description 7
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 7
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 7
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 4
- 238000012544 monitoring process Methods 0.000 claims description 4
- 229910052758 niobium Inorganic materials 0.000 claims description 4
- 239000010955 niobium Substances 0.000 claims description 4
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 claims description 4
- 239000010936 titanium Substances 0.000 claims description 4
- 229910052719 titanium Inorganic materials 0.000 claims description 4
- 238000005452 bending Methods 0.000 claims description 3
- 238000010276 construction Methods 0.000 claims description 3
- 230000001105 regulatory effect Effects 0.000 claims description 3
- 210000001503 joint Anatomy 0.000 abstract description 8
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 4
- 239000011248 coating agent Substances 0.000 description 4
- 238000000576 coating method Methods 0.000 description 4
- 239000004020 conductor Substances 0.000 description 4
- 230000001681 protective effect Effects 0.000 description 4
- 238000009434 installation Methods 0.000 description 3
- 238000012423 maintenance Methods 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 230000002950 deficient Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 239000011780 sodium chloride Substances 0.000 description 2
- 229910021607 Silver chloride Inorganic materials 0.000 description 1
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000010426 asphalt Substances 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 239000008151 electrolyte solution Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 238000005192 partition Methods 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 239000004332 silver Substances 0.000 description 1
- HKZLPVFGJNLROG-UHFFFAOYSA-M silver monochloride Chemical compound [Cl-].[Ag+] HKZLPVFGJNLROG-UHFFFAOYSA-M 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 230000001502 supplementing effect Effects 0.000 description 1
- 238000009827 uniform distribution Methods 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
Classifications
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
- C23F13/00—Inhibiting corrosion of metals by anodic or cathodic protection
- C23F13/02—Inhibiting corrosion of metals by anodic or cathodic protection cathodic; Selection of conditions, parameters or procedures for cathodic protection, e.g. of electrical conditions
- C23F13/06—Constructional parts, or assemblies of cathodic-protection apparatus
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Prevention Of Electric Corrosion (AREA)
Abstract
The invention relates to a metal pipe network corrosion prevention system and a method in a seawater environment, wherein the corrosion prevention system comprises an anode bed arranged on a seawater drainage runner of a seawater cooling pipe network system and an anode junction box matched with the anode bed on the runner; the anode bed comprises a cantilever which is horizontally hung on the seawater flow channel, a plurality of hanging cables are arranged on the cantilever at intervals in parallel, a plurality of anode components are arranged on the hanging cables from top to bottom, adjacent anode components are bound, and cables of the anode components are connected into an anode junction box after converging; the seawater pump, seawater pipeline and condenser in the seawater cooling pipe network system are electrically connected with each other to form a metal pipe network section, each metal pipe network section is in butt joint through an insulating short pipe or a cement underdrain, a plurality of cathode joints, reference electrodes and zero position negative joints are arranged at key positions of the metal pipe network section and are electrically connected with a dedicated potentiostat arranged on the metal pipe network section, and the potentiostat is electrically connected with an anode junction box. The invention aims to solve the problem of corrosion of a seawater metal pipe network, in particular to the problem of serious corrosion of an outlet section of the metal pipe network.
Description
Technical Field
The invention relates to the technical field of metal corrosion prevention by a sacrificial anode or external current cathode protection method, in particular to a metal pipe network corrosion prevention system and method in a seawater environment.
Background
Seawater corrosion refers to the corrosion of metal structures in seawater. Seawater is an electrolyte solution containing 3% -3.5% of sodium chloride (NaCl) and various salts, and also contains various suspended organisms and dissolved gases, so that the seawater has strong corrosiveness. When the salt content of the seawater increases, the oxygen dissolution amount increases, the temperature increases, and the flow rate increases, the corrosion rate of the seawater increases. Different marine organisms can also increase or slow the corrosion rate of metals. The corrosion rate of seawater is generally much greater than that of soil and atmospheric. In the marine environment, the medium conditions and corrosion environments at different water depths are different, the corrosion forms and rates are also different, and corresponding protective measures are adopted according to different conditions.
Cathodic protection is one of the common methods for preventing seawater corrosion, but is effective only in the full immersion area, and can be used for installing a sacrificial anode on the bottom of a ship or a metal structure in seawater, or adopting a cathodic protection method of externally applied current. For example, the impressed current cathodic protection method is adopted in the national standard of the people's republic of China, general requirements for impressed current cathodic protection System for coastal facilities (GB/T17005-2019). The cathodic protection method of impressed current of coastal facilities such as seawater pipelines, condensers, seawater pumps and the like is a method for reducing or preventing metal corrosion by leading a certain cathodic current to a protected metal pipe network through a power supply system so as to polarize the cathode to a certain potential. In seawater, the metal is polarized in the negative direction from the stable potential by 200-300 mV, so that the metal can be completely protected.
In the above standard, on the principle of uniform distribution of protection current, a plurality of anodes (chapter 5.6.2) are arranged in facility cavities such as seawater pipelines, seawater pumps, condensers and the like, and the main problems of the corrosion prevention method specified by the standard are that: the anodes arranged in the facilities cavities such as the seawater pipeline, the seawater pump and the condenser can absorb electrons from the seawater during operation, so that the electrons can be absorbed every time the seawater passes through one anode in the process of flowing in the pipe network, the capability of the seawater for anti-robbing electrons to the pipe network is stronger, namely the oxidization of the seawater is stronger, and the corrosion environment of the metal pipe network is worse; when seawater flows in a pipe network, the concentration of electrons which can be absorbed in the seawater is gradually reduced through one anode, so that the efficiency of the anode on a seawater outlet pipeline for absorbing electrons from the seawater in the pipeline is reduced, and the current injected into the seawater outlet pipeline by a power supply is deficient, the protection potential of a metal pipe network is deficient, the common phenomenon in practical engineering is that the outlet section of the seawater pipe network is severely corroded, and no practical and effective solution exists at present.
Disclosure of Invention
The invention provides a metal pipe network corrosion prevention system in a seawater environment, which is used for solving the problem of corrosion of a seawater metal pipe network, in particular to the problem of serious corrosion of an outlet section of the metal pipe network.
In order to solve the technical problems, the invention provides the following technical scheme:
the invention relates to a metal pipe network corrosion prevention system in a seawater environment, which comprises an anode bed arranged on a seawater drainage runner of a seawater cooling pipe network system and an anode junction box matched with the anode bed on the runner bank; the anode bed comprises cantilevers horizontally hung on the runner, a plurality of hanging cables are arranged on the cantilevers at intervals in parallel, a plurality of anode parts are arranged on the hanging cables from top to bottom, adjacent anode parts are mutually bound, and cables of the anode parts are converged into a cable harness and then connected into the anode junction box;
the seawater pump, the seawater pipeline and the condenser in the seawater cooling pipe network system are electrically connected with each other to form a metal pipe network section, the metal pipe network sections are connected through an insulating short pipe or a cement underdrain, a plurality of cathode joints are arranged at key positions of the metal pipe network section and are electrically connected with a dedicated potentiostat of the metal pipe network section through a cathode cable, and the potentiostat is electrically connected with the anode junction box through an anode cable;
the metal pipe network section is provided with a plurality of reference electrodes, and the reference electrodes are electrically connected with a dedicated potentiostat of the metal pipe network section through reference electrode shielding cables;
the metal pipe network section is provided with a plurality of zero position negative connecting points, and the zero position negative connecting points are electrically connected with a dedicated potentiostat of the metal pipe network section through zero position negative connecting cables and are used for monitoring cathodic protection potentials of the seawater pump, the seawater pipeline and the condenser.
In some embodiments, the anode component comprises an anode wire I, an anode wire II, a cable and a sealing joint, wherein the anode wire I is welded and sealed together with the top end of the anode wire II and the cable at the sealing joint at a bending point after being folded in half. The anode wire is preferably a platinum/niobium composite wire or a platinum/titanium composite wire.
In some embodiments, the cantilever is fixed on land shore by a positioning cable, a cantilever shaft perpendicular to the cantilever and provided with a cantilever shaft sleeve is arranged on the wall of the seawater drainage flow channel, the cantilever is fixedly connected with the cantilever shaft sleeve vertically, and the cantilever shaft sleeve can slide up and down and can rotate around the cantilever shaft.
In some embodiments, the sealing joint is provided with a fixing hole, the free end of the anode wire II is provided with a fixing ring, the hoisting cable is provided with a plurality of hanging rings from top to bottom, the upper fixing ring, the lower fixing hole and the hanging rings are bound by polytetrafluoroethylene binding wires, and the cables of each anode component are bound and converged into the cable harness by polytetrafluoroethylene binding wires along the hanging rings passing through the cables.
In some embodiments, the bottom end of the hoist cable is provided with a counterweight.
In some embodiments, the cantilever is provided with a float at an end adjacent to the seawater drain chute wall.
In some embodiments, the constant potential rectifier is powered by AC220V or AC380V, the rated output current is 1.5 times of the calculated maximum protection current amount, and the rated output voltage is DC 0-24V or DC 0-60V.
In some embodiments, the first and second anode wires are platinum/niobium composite wires or platinum/titanium composite wires, each having a diameter of 3mm and a length of 1000mm.
The invention also provides an anti-corrosion method for the metal pipe network in the seawater environment by utilizing the anti-corrosion system, which comprises the following steps:
A. checking the electric connection relation between individual units and individual combinations in protected facilities on site according to construction requirements, wherein the protected facilities comprise a seawater pump, a seawater pipeline and a condenser in a seawater cooling pipe network system, the seawater pump, the seawater pipeline and the condenser are electrically connected with each other to form a metal pipe network section, and the metal pipe network sections are connected through an insulating short pipe or a cement underdrain;
B. configuring a dedicated potentiostat for each metal pipe network segment, arranging a plurality of cathode contacts at focused positions on the metal pipe network segment, and electrically connecting the cathode contacts with the dedicated potentiostat of the metal pipe network segment through a cathode cable so as to ensure that the cathode protection potential of protected facilities reaches a specified value;
C. arranging anode junction boxes on the shore of a seawater drainage runner, arranging hoisting cables on the cantilever at intervals in parallel, arranging a plurality of anode components on the hoisting cables from top to bottom, converging cables of the anode components, and then connecting the cables to the anode junction boxes along the cantilever; then, arranging a vertical cantilever shaft on the sea water flow channel wall, mounting a cantilever on the cantilever shaft, and positioning the cantilever in the sea water flow channel through positioning cables at two sides which are tightly locked with a shore foundation;
D. the method comprises the steps that all potentiostats are converged through corresponding anode cables, a converging cable formed by converging is electrically connected to an anode junction box, a plurality of reference electrodes are arranged on a metal pipe network section, the reference electrodes are electrically connected with a potentiostat special for the metal pipe network section through reference electrode shielding cables, a plurality of zero position negative points are arranged on the metal pipe network section, and the potentiostats special for the metal pipe network section are electrically connected with the zero position negative cables, so that cathodic protection potentials of protected facilities are monitored;
E. the constant potential instrument is powered, parameters of the corrosion protection system (such as the potential of the protected facility, the given potential of the constant potential instrument, the output current of the constant potential instrument and the like) are regulated, and the corrosion protection system is put into operation.
In some embodiments, in the step C, a distance between an upper end of the first anode component below the seawater surface and the seawater surface is 1m or more; in the step D, the reference electrode is arranged below the lowest water level.
Compared with the prior art, the corrosion prevention system and method for the metal pipe network in the seawater environment have the following beneficial effects:
the invention breaks through the common practice of corrosion prevention by an internal and external current-adding cathode protection method in the sea water cooling pipe network system industry, designs a corrosion prevention system with a new structure, wherein the anode parts are made of two anode wires, the structure is simple, a plurality of anode parts are uniformly arranged in a sea water drainage flow channel of the sea water cooling pipe network system in the form of an anode bed, thus, the problem that in the previous industrial implementation scheme, the anode is arranged in a metal pipe network (such as a sea water pump, a sea water pipeline, a condenser and other facilities) (the specific method can refer to the general requirement of a coastal facility external current cathode protection system (GB/T17005-2019)) can be referred to, so that the capacity of absorbing electrons and the sea water in the metal pipe network for anti-robbing electrons to the pipe network is stronger when the sea water flows through the anode, namely, the oxidization of the sea water is stronger, the problem that the corrosion environment of the pipe network is worse is caused, the anode parts are not in parallel to water, the problem that the electron absorption efficiency of the anode parts is low, the number of the anode parts and the length of the anode wires are sufficient to fully satisfy the current-rich requirements of the cooling system, the current-rich requirements of the sea water protection system can be met, the problem that the corrosion protection of the metal pipe network is severely corroded by the metal pipe network is guaranteed, and the serious corrosion protection potential of the metal pipe network is guaranteed, and the corrosion protection problem is solved.
Drawings
The drawings in the present application are used for supplementing the description of the text part of the specification by using the figures, so that the technical scheme of the present application is further explained, and the present application is not limited improperly.
FIG. 1 is a schematic diagram of a cooling branch in a seawater cooling pipe network system in a metal pipe network corrosion prevention system and method in a seawater environment;
FIG. 2 is a schematic view of the structure of the anode bed of the seawater drainage flow channel in the corrosion protection system and method for metal pipe network in seawater environment of the present invention;
FIG. 3 is a schematic view of the structure of the anode component of the corrosion protection system and method for metal pipe network in the seawater environment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described below with reference to the accompanying drawings.
In the description of the present invention, it should be understood that the terms "center," "lateral," "longitudinal," "front," "rear," "left," "right," "upper," "lower," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, merely to facilitate describing the present invention and simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the scope of the present invention.
As shown in fig. 1, one cooling branch of the seawater cooling pipe network system comprises a seawater intake open channel 1 (shared by a plurality of cooling branches), a seawater pump 2, a seawater pipe 3, a condenser 6 and a seawater drainage runner 4 (shared by a plurality of cooling branches), wherein the seawater pump 2 and the condenser 6 are independent single-body equipment, the seawater pipe 3 is a metal seawater pipe, the seawater pump 2, the seawater pipe 3 and the condenser 6 are electrically connected with each other to form a metal pipe network section, and the metal pipe network sections are in butt joint through insulating short pipes 5 or cement underdrain.
Seawater in the sea flows in through the seawater intake open channel 1, is filtered in sequence through the coarse filter screen 101, the fine filter screen 102 and the drum-shaped rotary filter screen 103 arranged in the open channel, and is pumped into the rear seawater pipeline 3 and the condenser 6 through the seawater pump 2 through the metal pipe network section at the water inlet end of the seawater pipeline 3, so that high-temperature steam in the condenser 6 is cooled, and the seawater passing through the condenser 6 returns to the sea through the seawater pipeline 3 and the seawater drainage flow channel 4 at the outlet end of the condenser 6. The above are prior art and are not described in detail.
As shown in FIG. 1, the corrosion prevention system of the metal pipe network in the seawater environment comprises an anode bed arranged on a seawater drainage runner 4 and an anode junction box 9 matched with the anode bed on the runner, wherein the anode bed comprises a cantilever 10 horizontally hung on the seawater drainage runner. The anode junction box 9 is a common device in the field, and is used by grounding wires and coating with an anti-corrosion coating, and the wire inlet of the junction box and the anode wire bundles are insulated and sealed by referring to the conventional technical means. Each metal pipe network section is provided with a dedicated existing equipment potentiostat 8, in this embodiment, the power supply of the potentiostat 8 is AC220V or AC380V, the rated output current is about 1.5 times of the calculated maximum protection current (the calculation of the sea water pipe network protection current refers to the calculation of the protection current in section 5.2, the calculation of the protection area in section 5.3 and the selection of the protection current density in section 5.4 of GB/T17005-2019), the rated output voltage is DC 0-24V or DC 0-60V, and the placement position is convenient to operate and overhaul so as to facilitate the installation, detection and maintenance of the cable. The anode cables are protected by a protective tube and laid at the positions of the potentiostat 8, the potentiostat 8 is converged by the corresponding anode cables, after the convergence, an IR drop is not more than 1V and the middle is free of joints, a sufficient section is formed (according to ohm ' S law, the current I in the conductor is in direct proportion to the voltage U at two ends of the conductor, the current I=U/R and the R=U/I are in inverse proportion to the resistance R of the conductor, if U=1V (maximum value) and I are calculated according to the formula, the rated output current can be calculated, and the maximum resistance of the cable can be calculated, according to the ohm ' S law, the resistance R of the conductor is in direct proportion to the length L and the resistivity rho, the resistance R=rho/S and the S=rho/R of the cable are in inverse proportion to the cross-sectional area S, namely, copper wires or copper bars are generally adopted in engineering, the resistivity can be inquired, the maximum length of the anode cable of a specific engineering is known data, the minimum cross-sectional area of the cable can be calculated, the cable specification can be calculated according to ohm ' S law, the cable specification of the cable is selected, and the proper parameters of the cable is selected according to the industry) the cable specification is connected to the junction box 81 of the cable. The focused part of each metal pipe network section is provided with a plurality of cathode joints 7, for example, each seawater pump 2 is provided with 2-8, each seawater pipeline 3 is provided with 2 in the pipeline diameter symmetrical position every 7-20 m, each condenser 6 is provided with 2-4 near two end plates, and each potentiostat 8 is respectively and well electrically connected with the cathode joints 7 of corresponding protected facilities (namely, the seawater pump 2, the seawater pipeline 3 and the condenser 6) through corresponding cathode cables, and adopts corrosion prevention treatment. Wherein the cathode cable has a sufficient cross section (selected in the same way as the anode cable described above) and such that the IR drop does not exceed 1V. Each metal pipe network section is also provided with a plurality of reference electrodes 11 (the design of the reference electrodes 11 is referred to in GB/T17005-2019 chapter 5.7, the installation of the reference electrodes 11 is referred to in GB/T17005-2019 chapter 6.3), and the potentiostat 8 is reliably connected with the reference electrodes 11 through reference electrode shielding cables. Preferably, the reference electrode 11 adopts a mosaic structure, so that the normal operation of the equipment is not affected, and meanwhile, the reference electrode 11 is installed below the lowest water level when installed on a metal pipe network section. The reference electrode 11 provides a known standard potential, so that the potential difference between the working electrode and the reference electrode can be measured, and thus the standard potential of the working electrode can be calculated, thereby determining parameters such as the direction and the speed of chemical reaction, and the like, so as to facilitate measuring the potential of the relevant point of the corrosion protection system, and further optimize the system parameters or the operation mode. Preferably, the reference electrode 11 is typically a silver/silver chloride electrode or a zinc electrode. Each metal pipe network section is also provided with a plurality of zero position female connection points 12 (also called cathode connection points), the zero position female connection points 12 are the attention points on protected facilities, and the potentiostat 8 and the zero position female connection points 12 are reliably connected through zero position female connection cables (also called cathode grounding cables) and are subjected to conventional corrosion prevention treatment for monitoring the cathode protection potential of the protected facilities.
As shown in fig. 2, two sides of one end of the cantilever 10 are fixed on land shore by symmetrically arranged positioning cables 1001, the cantilever 10 is positioned in a seawater flow channel by the positioning cables 1001 on two sides which are tightly locked with the shore, a cantilever shaft 1002 vertical to the cantilever 10 is arranged along the wall of the seawater drainage flow channel 4, a cantilever shaft sleeve 1003 is arranged on the cantilever shaft 1002, the cantilever 10 is vertically and fixedly connected with the cantilever shaft sleeve 1003, and under the traction of a common external power device, the combination of the cantilever 10 and the cantilever shaft sleeve 1003 can slide up and down along the cantilever shaft 1002 and can rotate around the cantilever shaft 1002, so that the cantilever 10 can be lifted up along the cantilever shaft 1002 and rotated to the shore, thereby being convenient for installation and maintenance. A cable-stayed cable 1004 is fixed on the cantilever shaft sleeve 1003, one end of the cable-stayed cable 1004 is fixed on the cantilever shaft sleeve 1003, the other end is fixed on the cantilever 10, and the cantilever 10 is positioned in the horizontal direction by tightening the locked upward cable-stayed cable 1004 with the cantilever shaft sleeve 1003. A plurality of hoisting cables 13 are arranged on the cantilever 10 at intervals in parallel, and the distance between every two adjacent hoisting cables 13 is 2 m-3 m. In order to ensure the stability of the hoisting cable 13 in the vertical direction, a counterweight 131 is arranged at the bottom end of the hoisting cable 13. A plurality of anode parts 14 are arranged on each hoisting cable 13 from top to bottom. In this embodiment, the cantilever 10 has a minimum limit on the sea water surface, i.e. the distance between the upper end of the first anode member 14 below the sea water surface and the sea water surface is greater than or equal to 1m. Preferably, in this embodiment, a float 1005 is disposed at one end of the cantilever 10 near the wall of the flow channel, and the limitation of the cantilever 10 is achieved by the float 1005.
Referring to fig. 3, the anode member 14 includes a first anode wire 141 and a second anode wire 142, and the first anode wire 141 is folded in half and then welded and sealed together with the tip end of the second anode wire 142 and the cable 143 at the sealing joint 144 at a bending point. Preferably, the materials of the first anode wire 141 and the second anode wire 142 are platinum/niobium composite wires or platinum/titanium composite wires, and have a diameter phi of 3mm and a length of 300-2000 mm, and more preferably, a length of 1000mm. The cable 143 is preferably a single 6mm core 2 And is coated with polytetrafluoroethylene coating. The sealing joint 144 is provided with a fixing hole 1441, the free end of the anode wire two 142 is provided with a fixing ring 145, the hoisting cable 13 is provided with a plurality of hanging rings 132 from top to bottom, when in assembly, the bottom end of the upper anode part 14 is aligned with the top end of the lower anode part 14, and the fixing ring 145 of the upper anode part 14, the fixing hole 1441 of the lower anode part 14 and the hanging rings 132 are bound by polytetrafluoroethylene binding wiresThe cables 143 of each anode part 14 are bound with the passing line hanging ring 132 through polytetrafluoroethylene binding wires, the cable bundles 15 formed by converging after binding the cables 143 are protected by a protective tube, and are connected into the anode junction box 9 after being routed along the cantilever 10 and the runner wall. For maintenance, the cables 143 are provided with numbers and the colors of the outer skins are different.
The corrosion prevention method for the metal pipe network in the seawater environment by utilizing the corrosion prevention system comprises the following steps:
A. checking the electric connection relation among individual units or combinations of units in protected facilities such as a site seawater pipeline 3, a seawater pump 2, a condenser 6 and the like according to construction requirements, wherein the seawater pump 2, the seawater pipeline 3 and the condenser 6 are electrically connected with each other to form a metal pipe network section, and the metal pipe network sections are connected through an insulating short pipe 5 or a cement underdrain;
B. a dedicated potentiostat 8 is allocated for each metal pipe network section, a cathode cable is well electrically connected with a corresponding cathode joint 7 of a corresponding protected facility, conventional anti-corrosion treatment is carried out, for example, asphalt coating is carried out, and the cathode joint 7 is arranged at a key attention part of the protected facility (the part is related to the structure of the protected facility, such as a partition wall of a seawater pump cavity, the seawater pipeline is axially arranged at a pipeline diameter symmetrical position every 7-20 m and two end plates of a condenser) so as to ensure that the cathode protection potential of the protected facility reaches a specified value;
C. an anode junction box 9 is arranged on the shore of a seawater drainage runner 4, hoisting cables 13 are arranged on a cantilever 10 at intervals in parallel, a plurality of anode parts 14 are arranged on the hoisting cables 13 from top to bottom, the distance between the upper end of a first anode part 14 below the seawater surface and the seawater surface is more than or equal to 1m, cables 143 of the anode parts 14 are converged and then are routed along the cantilever 10 and the runner wall, and then the anode junction box 9 is connected. Next, a vertical cantilever shaft 1002 is arranged on the wall of the seawater drainage channel 4, a cantilever 10 and a cantilever shaft sleeve 1003 are mounted on the cantilever shaft 1002, the cantilever 10 is fixedly connected with the cantilever shaft sleeve 1003 vertically, the cantilever 10 is positioned in the seawater channel through positioning cables 1001 at two sides which are tightly locked with the shore foundation, and the vertical cantilever shaft further comprises a diagonal cable 1004, one end of the diagonal cable 1004 is fixed on the cantilever shaft sleeve 1003, the other end of the diagonal cable 1004 is fixed on the cantilever 10, and the cantilever 10 is positioned in the horizontal direction through the diagonal cable 1004 which is tightly locked with the cantilever shaft sleeve 1003 upwards. Further, a float 1005 is provided at the end of the cantilever 10 near the flow channel wall. Preferably, the cables in the present application are protected by a protective tube.
D. A plurality of anode cables are protected by a protection tube and laid at each potentiostat 8, each potentiostat 8 is converged through a corresponding anode cable, a converging cable 81 formed by converging is electrically connected to an anode junction box 9, a plurality of reference electrodes 11 are arranged on each metal pipe network section, and the current collectors 8 which are special for the metal pipe network section are electrically connected through reference electrode shielding cables; a plurality of zero position female connection points 12 are arranged on each metal pipe network section, and are electrically connected with a dedicated potentiostat of the metal pipe network section through zero position female connection cables, and are used for monitoring cathodic protection potential of protected facilities;
E. the constant potential instrument 8 is powered, system parameters (such as the potential of protected facilities, the given potential of the constant potential instrument, the output current of the constant potential instrument and the like) are regulated, and the seawater metal pipe network corrosion prevention system is put into operation.
The invention totally cancels anodes which are arranged on a seawater pipeline at intervals and are specified by the standard GB/T17005-2019, anodes which are arranged on a vertical seawater pump and anodes which are arranged on each water chamber of a condenser, reduces engineering links, improves the reliability of the operation of a metal pipe network, uniformly places anode components 14 in a seawater drainage runner 4 of a seawater cooling pipe network system in the form of an anode bed, and is convenient to maintain; the seawater pipeline 3, the seawater pump 2 and the condenser 6 are electrically connected with each other to form a metal pipe network section, the metal pipe network sections are connected through the insulating short pipe 5 or the cement underdrain, a dedicated power supply (a potentiostat 8) configured by each metal pipe network section is provided with a public anode bed through the anode junction box 9, the seawater metal pipe network corrosion prevention system is high in reliability, the seawater state in the metal pipe network is not influenced, the corrosion problem of the outlet section of the seawater metal pipe network is not aggravated, and the seawater pipe network corrosion prevention system is suitable for external current cathode protection of coastal facilities in which seawater such as the seawater pipeline, the condenser, the seawater pump and the like flow through an internal cavity. In a word, the method is suitable for solving the problem of metal pipe network corrosion of the seawater cooling pipe network systems of nuclear power plants, thermal power plants and the like.
The above examples are only illustrative of the preferred embodiments of the present invention and are not intended to limit the scope of the present invention, and various modifications and improvements made by those skilled in the art to the technical solution of the present invention should fall within the scope of protection defined by the claims of the present invention without departing from the spirit of the present invention.
Claims (10)
1. The utility model provides a metal pipe network anti-corrosion system under seawater environment, includes the positive pole bed of arranging in sea water drainage runner (4) of sea water cooling pipe network system and on this runner bank supporting positive pole junction box (9), its characterized in that: the anode bed comprises cantilevers (10) horizontally hung on the runner, a plurality of hanging cables (13) are arranged on the cantilevers (10) at intervals in parallel, a plurality of anode parts (14) are arranged on the hanging cables (13) from top to bottom, adjacent anode parts (14) are mutually bound, and cables (143) of the plurality of anode parts (14) are converged into a cable harness (15) and then are connected into the anode junction box (9);
the seawater pump (2), the seawater pipeline (3) and the condenser (6) in the seawater cooling pipe network system are electrically connected with each other to form a metal pipe network section, the metal pipe network sections are connected with each other through an insulating short pipe (5) or a cement underdrain, a plurality of cathode joints (7) are arranged at key positions of the metal pipe network section, the cathode joints (7) are electrically connected with a dedicated potentiostat (8) of the metal pipe network section through a cathode cable, and the potentiostat (8) is electrically connected with the anode junction box (9) through an anode cable;
the metal pipe network section is provided with a plurality of reference electrodes (11), and the reference electrodes (11) are electrically connected with a dedicated potentiostat (8) of the metal pipe network section through reference electrode shielding cables;
the metal pipe network section is provided with a plurality of zero position female connection points (12), and the zero position female connection points (12) are electrically connected with a dedicated potentiostat (8) of the metal pipe network section through zero position female connection cables and are used for monitoring cathodic protection potentials of the seawater pump (2), the seawater pipeline (3) and the condenser (6).
2. The corrosion protection system for a metal pipe network in a seawater environment of claim 1, wherein: the anode component (14) comprises an anode wire I (141), an anode wire II (142), a cable (143) and a sealing joint (144), wherein the anode wire I (141) is folded in half from the anode wire II, and then is welded and sealed with the top end of the anode wire II (142) and the cable (143) at the sealing joint (144) at a bending point.
3. The corrosion protection system for a metal pipe network in a seawater environment of claim 2, wherein: cantilever (10) are fixed on land shore base through positioning cable (1001), be arranged on the wall of sea water drainage runner (4) with cantilever (10) perpendicular and join in marriage cantilever axle (1002) of cantilever axle sleeve (1003), cantilever (10) and cantilever axle sleeve (1003) perpendicular fixed connection and both can follow cantilever axle (1002) up-and-down slip and can rotate around cantilever axle (1002), still include oblique cable (1004), cable (1004) one end is fixed on cantilever axle sleeve (1003) to one side, and the other end is fixed on cantilever (10).
4. A metal pipe network corrosion protection system in a seawater environment according to claim 3, wherein: the sealing joint (144) is provided with a fixing hole (1441), the free end of the anode wire II (142) is provided with a fixing ring (145), the hoisting cable (13) is provided with a plurality of hanging rings (132) from top to bottom, the upper fixing ring (145), the lower fixing hole (1441) and the hanging rings (132) are bound through polytetrafluoroethylene binding wires, and the cables (143) of each anode part (14) are bound and converged into the cable harness (15) through polytetrafluoroethylene binding wires together with the passing wire hanging rings (132).
5. The corrosion protection system for a metal pipe network in a seawater environment of claim 4, wherein: the bottom of hoist cable (13) is provided with balancing weight (131).
6. The corrosion protection system for a metal pipe network in a seawater environment of claim 5, wherein: one end of the cantilever (10) close to the wall of the seawater drainage flow passage (4) is provided with a float (1005).
7. The corrosion protection system for a metal pipe network in a seawater environment of claim 6, wherein: the power supply of the potentiostat (8) is AC220V or AC380V, the rated output current is 1.5 times of the calculated maximum protection current amount, and the rated output voltage is DC 0-24V or DC 0-60V.
8. The corrosion protection system for a metal pipe network in a seawater environment of claim 7, wherein: the first anode wire (141) and the second anode wire (142) are both platinum/niobium composite wires or platinum/titanium composite wires, the diameters of the wires are 3mm, and the lengths of the wires are 1000mm.
9. A seawater environment metal pipe network corrosion prevention method using the seawater environment metal pipe network corrosion prevention system of any one of claims 1 to 8, comprising the steps of:
A. checking the electric connection relation between individual units and individual combinations in protected facilities on site according to construction requirements, wherein the protected facilities comprise a seawater pump (2), a seawater pipeline (3) and a condenser (6) in a seawater cooling pipe network system, the seawater pump (2), the seawater pipeline (3) and the condenser (6) are electrically connected with each other to form a metal pipe network section, and the metal pipe network sections are connected with each other through an insulating short pipe (5) or a cement underdrain;
B. configuring a dedicated potentiostat (8) for each metal pipe network segment, arranging a plurality of cathode contacts (7) at focused key positions on the metal pipe network segments, and electrically connecting the dedicated potentiostats (8) of the metal pipe network segment through cathode cables to ensure that the cathodic protection potential of protected facilities reaches a specified value;
C. arranging anode junction boxes (9) on the shore of a seawater drainage runner (4), arranging hoisting cables (13) on a cantilever (10) at intervals in parallel, arranging a plurality of anode components (14) on the hoisting cables (13) from top to bottom, converging cables (143) of each anode component (14) and then connecting the cables into the anode junction boxes (9) along the cantilever (10); then, arranging a vertical cantilever shaft (1002) on the wall of the seawater drainage runner (4), mounting a cantilever (10) on the cantilever shaft (1002), and positioning the cantilever (10) in the seawater runner through positioning cables (1001) at two sides which are tightly locked with the runner shore base;
D. the method comprises the steps that each potentiostat (8) is converged through a corresponding anode cable, a converging cable (81) formed by converging is electrically connected to an anode junction box (9), a plurality of reference electrodes (11) are arranged on a metal pipe network section, the potentiostat (8) which is exclusive to the metal pipe network section and is located by the reference electrode shielding cable is electrically connected, a plurality of zero position negative connecting points (12) are arranged on the metal pipe network section, and the potentiostat (8) which is exclusive to the metal pipe network section and is located by the zero position negative connecting cable is electrically connected, so that the cathodic protection potential of protected facilities is monitored;
E. the constant potential instrument (8) is supplied with power, the potential of the protected facility, the given potential of the constant potential instrument (8) and the output current of the constant potential instrument (8) are regulated, and the corrosion protection system is put into operation.
10. The method for preventing corrosion of a metal pipe network in a seawater environment according to claim 9, wherein the method comprises the following steps: in the step C, the distance between the upper end of the first anode part (14) below the seawater surface and the seawater surface is more than or equal to 1m; in the step D, the reference electrode (11) is arranged below the lowest water level.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311329148.5A CN117364087A (en) | 2023-10-13 | 2023-10-13 | Corrosion prevention system and method for metal pipe network in seawater environment |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202311329148.5A CN117364087A (en) | 2023-10-13 | 2023-10-13 | Corrosion prevention system and method for metal pipe network in seawater environment |
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| CN202311329148.5A Pending CN117364087A (en) | 2023-10-13 | 2023-10-13 | Corrosion prevention system and method for metal pipe network in seawater environment |
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