CN109706457B - Electronic anode protection anti-corrosion device and method for phase change heat storage equipment - Google Patents
Electronic anode protection anti-corrosion device and method for phase change heat storage equipment Download PDFInfo
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- CN109706457B CN109706457B CN201711016066.XA CN201711016066A CN109706457B CN 109706457 B CN109706457 B CN 109706457B CN 201711016066 A CN201711016066 A CN 201711016066A CN 109706457 B CN109706457 B CN 109706457B
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- 238000005338 heat storage Methods 0.000 title claims abstract description 45
- 230000008859 change Effects 0.000 title claims abstract description 24
- 238000000034 method Methods 0.000 title claims abstract description 12
- 238000005260 corrosion Methods 0.000 title claims description 34
- 229910052751 metal Inorganic materials 0.000 claims abstract description 104
- 239000002184 metal Substances 0.000 claims abstract description 104
- 229910001220 stainless steel Inorganic materials 0.000 claims abstract description 43
- 239000010935 stainless steel Substances 0.000 claims abstract description 43
- 239000012782 phase change material Substances 0.000 claims abstract description 28
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 26
- 229910052802 copper Inorganic materials 0.000 claims abstract description 26
- 239000010949 copper Substances 0.000 claims abstract description 26
- 150000003839 salts Chemical class 0.000 claims abstract description 23
- 230000007797 corrosion Effects 0.000 claims description 23
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 12
- WMFOQBRAJBCJND-UHFFFAOYSA-M Lithium hydroxide Chemical compound [Li+].[OH-] WMFOQBRAJBCJND-UHFFFAOYSA-M 0.000 claims description 9
- ZUDYPQRUOYEARG-UHFFFAOYSA-L barium(2+);dihydroxide;octahydrate Chemical compound O.O.O.O.O.O.O.O.[OH-].[OH-].[Ba+2] ZUDYPQRUOYEARG-UHFFFAOYSA-L 0.000 claims description 9
- 238000012360 testing method Methods 0.000 claims description 7
- 229910001120 nichrome Inorganic materials 0.000 claims description 6
- 229910052759 nickel Inorganic materials 0.000 claims description 6
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 claims description 6
- 229910021484 silicon-nickel alloy Inorganic materials 0.000 claims description 6
- 229910000589 SAE 304 stainless steel Inorganic materials 0.000 claims description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 4
- 229910000881 Cu alloy Inorganic materials 0.000 claims description 3
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 3
- 229910001080 W alloy Inorganic materials 0.000 claims description 3
- 238000010276 construction Methods 0.000 claims description 3
- 238000005259 measurement Methods 0.000 claims description 3
- 229910052758 niobium Inorganic materials 0.000 claims description 3
- 239000010955 niobium Substances 0.000 claims description 3
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 claims description 3
- ATLAQRSQSGOMOU-UHFFFAOYSA-N niobium platinum Chemical compound [Nb].[Pt] ATLAQRSQSGOMOU-UHFFFAOYSA-N 0.000 claims description 3
- UUWCBFKLGFQDME-UHFFFAOYSA-N platinum titanium Chemical compound [Ti].[Pt] UUWCBFKLGFQDME-UHFFFAOYSA-N 0.000 claims description 3
- JBJWASZNUJCEKT-UHFFFAOYSA-M sodium;hydroxide;hydrate Chemical compound O.[OH-].[Na+] JBJWASZNUJCEKT-UHFFFAOYSA-M 0.000 claims description 3
- 239000010936 titanium Substances 0.000 claims description 3
- 229910052719 titanium Inorganic materials 0.000 claims description 3
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 claims description 3
- 229910052721 tungsten Inorganic materials 0.000 claims description 3
- 239000010937 tungsten Substances 0.000 claims description 3
- 238000009413 insulation Methods 0.000 claims description 2
- 238000002955 isolation Methods 0.000 claims description 2
- 229910052697 platinum Inorganic materials 0.000 claims description 2
- 238000005286 illumination Methods 0.000 claims 1
- 229910000623 nickel–chromium alloy Inorganic materials 0.000 claims 1
- 238000006056 electrooxidation reaction Methods 0.000 abstract description 8
- 238000005536 corrosion prevention Methods 0.000 abstract 2
- 239000012670 alkaline solution Substances 0.000 abstract 1
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 6
- 238000003466 welding Methods 0.000 description 6
- 230000036571 hydration Effects 0.000 description 5
- 238000006703 hydration reaction Methods 0.000 description 5
- 238000004146 energy storage Methods 0.000 description 4
- 239000010405 anode material Substances 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 230000001105 regulatory effect Effects 0.000 description 3
- 239000011232 storage material Substances 0.000 description 3
- 239000010963 304 stainless steel Substances 0.000 description 2
- 229910000978 Pb alloy Inorganic materials 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000004210 cathodic protection Methods 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 238000002425 crystallisation Methods 0.000 description 2
- 230000008025 crystallization Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000003792 electrolyte Substances 0.000 description 2
- 238000010309 melting process Methods 0.000 description 2
- 150000002739 metals Chemical class 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 235000011121 sodium hydroxide Nutrition 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 230000004888 barrier function Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010292 electrical insulation Methods 0.000 description 1
- 238000009713 electroplating Methods 0.000 description 1
- 229920001903 high density polyethylene Polymers 0.000 description 1
- 239000004700 high-density polyethylene Substances 0.000 description 1
- 239000011244 liquid electrolyte Substances 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 230000010287 polarization Effects 0.000 description 1
- -1 polytetrafluoroethylene Polymers 0.000 description 1
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- 230000002035 prolonged effect Effects 0.000 description 1
Classifications
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/14—Thermal energy storage
Abstract
The invention relates to an electronic anode protection corrosion prevention device and method of phase change heat storage equipment, wherein the phase change heat storage equipment comprises a metal liner and a heat exchange metal coil pipe arranged in the metal liner, a hydrated salt phase change material serving as a heat storage medium is also contained in the metal liner, the corrosion prevention device comprises a direct current power supply, an auxiliary anode and a reference electrode, wherein the negative electrode of the direct current power supply is connected with the metal liner and the heat exchange metal coil pipe through a lead, and the auxiliary anode is inserted into the hydrated salt phase change material and is electrically insulated and isolated from the metal liner and the heat exchange metal coil pipe. Compared with the prior art, the invention realizes the protection of heat storage equipment metal parts such as stainless steel, copper metal and the like in high-temperature strong alkaline solution, obviously reduces the electrochemical corrosion rate of the heat storage equipment metal parts, obviously prolongs the service life of the phase change heat storage equipment, improves the economic benefit and the like.
Description
Technical Field
The invention relates to anti-corrosion treatment of phase-change heat storage equipment, in particular to an electronic anode protection anti-corrosion device and method of phase-change heat storage equipment.
Background
In the field of phase-change energy storage equipment, when the equipment is used for phase-change energy storage, for example, a hydration salt phase-change energy storage material adopted by the equipment can form high-temperature liquid electrolyte, so that obvious electrochemical corrosion is generated on a metal packaging shell, and finally, the material is leaked, so that irrecoverable economic loss is caused. The traditional anti-corrosion means are coating, electroplating and the like, but the requirements on the construction process are higher, and the actual protection effect is not ideal.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide an electronic anode protection anti-corrosion device of the phase change heat storage equipment.
The aim of the invention can be achieved by the following technical scheme:
the electronic anode protection anticorrosion device of the phase change heat storage equipment comprises a metal liner and a heat exchange metal coil pipe arranged in the metal liner, wherein a hydration salt phase change material serving as a heat storage medium is further contained in the metal liner, the anticorrosion device comprises a direct current power supply, an auxiliary anode and a reference electrode, wherein the negative electrode of the direct current power supply is connected with the metal liner and the heat exchange metal coil pipe through a lead, the positive electrode is connected with the auxiliary anode, the auxiliary anode is further inserted into the hydration salt phase change material and is electrically insulated and isolated from the metal liner and the heat exchange metal coil pipe, and the reference electrode is inserted into the heat storage medium and is connected with the positive electrode or the negative electrode of external potential testing equipment during measurement.
Preferably, the hydrated salt phase change material is one or a combination of a plurality of lithium hydroxide, sodium hydroxide monohydrate or barium hydroxide octahydrate and the like. More preferably, the hydrated salt phase change material is barium hydroxide octahydrate, which has high energy storage density, moderate phase change temperature, long cycle life and the like.
Preferably, the metal liner is made of stainless steel, and the stainless steel is selected from one or a combination of a plurality of stainless steel 201, stainless steel 304 or stainless steel 316; preferably, the heat exchange metal coil is a copper coil or a copper alloy coil.
More preferably, copper and stainless steel have different protection current densities because they have different self-corrosion potentials, the former being about 300mV higher than the latter. Theoretically, to protect stainless steel and copper from electrochemical corrosion in a high temperature (90 ℃) solution of barium hydroxide octahydrate, a protection current density of 51mA/m is required, respectively 2 And 38mA/m 2 . For the case that the area ratio of the stainless steel to the copper to be protected is different, the protection current density of the stainless steel can be referred to for the purpose of simultaneously protecting the copper. The larger the area ratio of stainless steel to copper protected, the larger the required output protection current. If the protected area ratio of the metal liner to the heat exchange metal coil is 9: at 10, the protection current density of the output of the direct current power supply is 46mA/m 2 At this time, the corrosion rate of stainless steel and copper can be reduced to 10 -3 mm/a, an order of magnitude lower than the natural corrosion rate without electron anode protection, and the power consumption in one heating season is only 5kWh. When the metal liner and the heat exchange metal discWhen the protected area ratio of the tube is 4:3, the protection current density output by the direct current power supply is 54mA/m 2 . In addition, the invention can also obviously protect the corrosion of the stainless steel welding seam, and the corrosion rate of the stainless steel welding seam which is applied with cathodic protection is reduced by more than 5 times compared with the natural corrosion rate. While for a caustic soda solution of 60% concentration, a current density of 5A/m is required to protect a steel tank from electrochemical corrosion at a high temperature of 100 DEG C 2 Much greater than the current density described in the present invention.
In addition, for the electron anode protection technology of the invention, in the exothermic crystallization or endothermic melting process of the phase change heat storage material, the conductivity of the corresponding phase change material can be reduced or increased, according to the relation: the output current can be self-regulated according to the change of the conductivity of the material under the condition that the voltage is constant, and the current is ≡voltage multiplied by the conductivity, so that the proper protection current is provided for the protected metal.
Preferably, the ripple coefficient of the dc power supply is less than 5%, which is one or a combination of several of a potentiostat, a galvanostat, a dc constant current power supply, a dc constant voltage power supply, a dc power supply for LED lighting, a power adapter, and the like.
Preferably, the direct current power supply is a direct current constant current power supply or a direct current constant voltage power supply.
Preferably, the auxiliary anode is one or a combination of a plurality of pure nickel, nichrome, pure tungsten, tungsten alloy, platinum-plated niobium or platinum-plated titanium;
the reference electrode is one or the combination of a plurality of pure nickel, nichrome, nickel-silicon alloy, platinum-niobium or platinum-titanium.
Preferably, the auxiliary anode is sleeved with an insulating sleeve which is electrically insulated and isolated from the metal liner and the heat exchange metal coil, and the insulating sleeve is provided with an opening and enables the auxiliary anode to be in contact with the hydrated salt phase change material.
Preferably, the auxiliary anode is cylindrical or strip-shaped.
Preferably, the metal liner is round or square.
The electron anode protection anticorrosion method of the phase change heat storage equipment comprises a metal liner and a heat exchange metal coil pipe arranged in the metal liner, wherein a hydrated salt phase change material serving as a heat storage medium is also contained in the metal liner, and the method is characterized by comprising the following steps:
(1) The method comprises the steps of respectively connecting a metal liner and a heat exchange metal coil with a negative electrode of a direct current power supply by adopting a lead, simultaneously connecting a positive electrode of the direct current power supply with an auxiliary anode inserted into water and salt phase change materials, keeping the auxiliary anode and the metal liner and the heat exchange metal coil in electric insulation isolation, and then inserting a reference electrode connected with the positive electrode or the negative electrode of external potential testing equipment into the water and salt phase change materials to complete the construction of an electronic anode protection system;
(2) And starting a direct-current power supply, and outputting a set protection current density, namely, realizing the anti-corrosion protection of the phase-change heat storage equipment.
The application of the electron anode technology mainly protects a single metal, and when two or more metals need to be protected, the difficulty is mainly two: 1. the self-corrosion potential of the protected metal is different, and it is difficult to obtain a protection current density which has more than two metal protection effects at the same time. The invention aims at the heat exchange coil pipe with the stainless steel metal liner and the copper metal liner, and the experimental study shows that the two metals can be protected simultaneously when the temperature is regulated within a certain protection current density range, and in addition, the larger the protection area ratio of the stainless steel to the copper is, the larger the required output protection current is. 2. The auxiliary anode is selected to simultaneously produce stable cathodic polarization of the protected metal. The invention solves this problem by finding a suitable auxiliary anode.
Compared with the prior art, the auxiliary anode material, the external direct current power supply and the reference electrode adopted by the invention are cheap and easy to obtain and convenient to install, the cost of an electronic anode protection system can be obviously reduced, the electrochemical corrosion of the protected metal can be effectively slowed down, and the service life of the phase change heat storage equipment can be prolonged.
Drawings
FIG. 1 is a schematic view of the apparatus of the present invention;
in the figure, a 1-direct current power supply, a 2-wire, a 3-heat exchange metal coil, a 4-metal liner, a 5-heat storage medium, a 6-insulating sleeve and a 7-auxiliary anode.
Detailed Description
The invention will now be described in detail with reference to the drawings and specific examples.
Referring to fig. 1, the electronic anode protection anticorrosion device of the phase-change heat storage device comprises a metal liner 4 and a heat exchange metal coil 3 arranged in the metal liner 4, a hydration salt phase-change material serving as a heat storage medium 5 is further contained in the metal liner 4, the anticorrosion device comprises a direct-current power supply 1, an auxiliary anode 7 and a reference electrode, wherein a negative electrode of the direct-current power supply 1 is connected with the metal liner 4 and the heat exchange metal coil 3 through a lead 2, the auxiliary anode 7 is inserted into the hydration salt phase-change material and is electrically isolated from the metal liner 4 and the heat exchange metal coil 3, and the reference electrode is inserted into the heat storage medium and is connected with an anode or a cathode of external potential testing equipment during measurement.
As a preferred embodiment of the present invention, the hydrated salt phase change material is one or a combination of several of lithium hydroxide, sodium hydroxide monohydrate, barium hydroxide octahydrate and the like. More preferably, the hydrated salt phase change material is barium hydroxide octahydrate.
As a preferred embodiment of the present invention, the metal bladder 4 is made of stainless steel, and the stainless steel is selected from one or a combination of several of stainless steel 201, stainless steel 304, stainless steel 316, etc.; preferably, the heat exchange metal coil 3 is a copper coil or a copper alloy coil.
More preferably, copper and stainless steel have different protection current densities because they have different self-corrosion potentials, the former being about 300mV higher than the latter. Theoretically, to protect stainless steel and copper from electrochemical corrosion in a high temperature (90 ℃) solution of barium hydroxide octahydrate, a protection current density of 51mA/m is required, respectively 2 And 38mA/m 2 . For the case that the area ratio of the stainless steel to the copper to be protected is different, the protection current density of the stainless steel can be referred to for the purpose of simultaneously protecting the copper. If the protected area ratio of the metal liner 4 to the heat exchange metal coil 3 is 9: at the time of 10 a, the time of the reaction,the protection current density output by the direct current power supply 1 is 46mA/m 2 At this time, the corrosion rate of stainless steel and copper can be reduced to 10 -3 mm/a, an order of magnitude lower than the natural corrosion rate without electron anode protection, and the power consumption in one heating season is only 5kWh. When the protected area ratio of the metal liner 4 to the heat exchange metal coil 3 is 4:3, the protection current density output by the direct current power supply 1 is 54mA/m 2 . In addition, the invention can also obviously protect the corrosion of the stainless steel welding seam, and the corrosion rate of the stainless steel welding seam which is applied with cathodic protection is reduced by more than 5 times compared with the natural corrosion rate. While for a caustic soda solution of 60% concentration, a current density of 5A/m is required to protect a steel tank from electrochemical corrosion at a high temperature of 100 DEG C 2 Much greater than the current density described in the present invention.
In addition, for the electron anode protection technology of the invention, in the exothermic crystallization or endothermic melting process of the phase change heat storage material, the conductivity of the corresponding phase change material can be reduced or increased, according to the relation: the output current can be self-regulated according to the change of the conductivity of the material under the condition that the voltage is constant, and the current is ≡voltage multiplied by the conductivity, so that the proper protection current is provided for the protected metal.
In a preferred embodiment of the present invention, the ripple coefficient of the dc power supply 1 is less than 5%, and the dc power supply is one or a combination of several of a potentiostat, a galvanostat, a dc constant current power supply, a dc constant voltage power supply, a dc power supply 1 for LED lighting, a power adapter, and the like.
As a preferred embodiment of the present invention, the dc power supply 1 is a dc constant current power supply or a dc constant voltage power supply.
As a preferred embodiment of the present invention, the auxiliary anode 7 is one or a combination of several of pure nickel, nichrome, nickel-silicon alloy, pure tungsten, tungsten alloy, platinum, platinized niobium or platinized titanium;
the reference electrode is one or the combination of a plurality of pure nickel, nichrome, nickel-silicon alloy, platinum-niobium or platinum-titanium.
As a preferred embodiment of the present invention, the auxiliary anode 7 is sleeved with an insulating sleeve 6 for electrically insulating and isolating the auxiliary anode 7 from the metal liner 4 and the heat exchange metal coil 3, and the insulating sleeve 6 is provided with an opening and makes the auxiliary anode 7 contact with the hydrated salt phase change material.
As a preferred embodiment of the present invention, the auxiliary anode 7 has a cylindrical shape or a strip shape.
As a preferred embodiment of the present invention, the metal bladder 4 is circular or square.
Example 1
An electronic anode protection anticorrosion device of phase-change heat storage equipment utilizes an electronic anode system to carry out anticorrosion protection on the phase-change heat storage equipment, and the electronic anode system comprises the phase-change heat storage equipment, a direct-current power supply 1, an auxiliary anode 7 and a reference electrode. Specifically, the metal liner 4 of the phase change heat storage device is square 304 stainless steel, a heat exchange copper coil is arranged in the metal liner, the surface area ratio of the protected stainless steel to copper is 9:10, and the total protected area is 10.4m 2 . The thermal storage medium 5 is preferably a barium hydroxide octahydrate phase change material. The DC power supply 1 is required to have a ripple coefficient of less than 5%, and preferably the DC power supply 1 for LEDs is input with 220V/50Hz and output with 3.5V/0.5A. The auxiliary anode 7 is preferably a nickel-silicon alloy wire of Φ1.2. The reference electrode is preferably a phi 0.2 platinum wire, and the protected metal potential is tested with a multimeter.
As shown in fig. 1, in order to prevent stainless steel and copper from electrochemical corrosion, a stainless steel metal liner 4 and a copper heat exchange metal coil 3 are connected with the negative electrode of a direct current power supply 1 through a lead 2, and an auxiliary anode 7 is connected with the positive electrode of the direct current power supply 1, and the length of the auxiliary anode is equal to the vertical height of a phase change material. The auxiliary anode 7 must be electrically isolated from the protected metal. The electrically insulating barrier preferably uses a high-density polyethylene sleeve of diameter Φ20 as insulating sleeve, which needs openings (Φ4) for better communication between the electrolyte and the auxiliary anode 7. And after the electric connection is finished, the power supply is connected to test the protection parameters. With a protection current density of 46mA/m 2 In the case of (a), not only can the corrosion rate of stainless steel and copper be reduced to 10 -3 mm/a, the corrosion rate of the stainless steel welding line is reduced by an order of magnitude compared with the natural corrosion rate without the electronic anode protection, and the corrosion rate of the stainless steel welding line is reduced by more than 5 times compared with the natural corrosion rate.By adopting the technical scheme of the invention, the power consumption of one phase change heat storage device in one heating season is only 5kWh, and the visible cost is lower. The consumption rate of the auxiliary anode 7 is 10.3g/Aa, which is equivalent to that of a common lead alloy sacrificial anode material.
Example 2
An electronic anode protection anticorrosion device of phase-change heat storage equipment utilizes an electronic anode system to carry out anticorrosion protection on the phase-change heat storage equipment, and the electronic anode system comprises the phase-change heat storage equipment, a direct-current power supply 1, an auxiliary anode 7 and a reference electrode. Specifically, the metal liner 4 of the phase change heat storage device is square 304 stainless steel, a heat exchange copper coil is arranged in the metal liner, the surface area ratio of the protected stainless steel to copper is 4:3, and the total protected area is 28m 2 . The thermal storage medium 5 is preferably a barium hydroxide octahydrate phase change material. The DC power supply 1 requires a ripple coefficient of less than 5%, preferably a power adapter, with an input of 220V/50Hz and an output of 5V/1.5A. The auxiliary anode 7 is preferably a nichrome wire of Φ2.0. The reference electrode is preferably a phi 0.2 platinum wire, and the protected metal potential is tested with a multimeter.
In the implementation process, the stainless steel and copper lead wires 2 are connected with the negative electrode of the direct current power supply 1, the auxiliary anode 7 is connected with the positive electrode of the direct current power supply 1, and the length of the auxiliary anode is equal to the vertical height of the phase change material. The auxiliary anode 7 is electrically isolated from the protected metal. The electrical insulation preferably uses a polytetrafluoroethylene sleeve of diameter Φ20 as the insulating sleeve 6, the insulating sleeve 6 requiring openings (Φ4) for better communication between the electrolyte and the auxiliary anode 7. And after the electric connection is finished, the power supply is connected to test the protection parameters. With a protection current density of 54mA/m 2 Can reduce the corrosion rate of stainless steel and copper to 10 -3 The corrosion rate of the stainless steel weld joint is reduced by more than 5 times in mm/a. The consumption rate of the auxiliary anode 7 is 9.0g/Aa, which is equivalent to that of a common lead alloy sacrificial anode material.
The previous description of the embodiments is provided to facilitate a person of ordinary skill in the art in order to make and use the present invention. It will be apparent to those skilled in the art that various modifications can be readily made to these embodiments and the generic principles described herein may be applied to other embodiments without the use of the inventive faculty. Therefore, the present invention is not limited to the above-described embodiments, and those skilled in the art, based on the present disclosure, should make improvements and modifications without departing from the scope of the present invention.
Claims (7)
1. The electronic anode protection anticorrosion device of the phase change heat storage equipment is characterized by comprising a metal liner and a heat exchange metal coil pipe arranged in the metal liner, wherein a hydrated salt phase change material serving as a heat storage medium is also contained in the metal liner, the anticorrosion device comprises a direct current power supply, an auxiliary anode and a reference electrode, wherein the negative electrode of the direct current power supply is connected with the metal liner and the heat exchange metal coil pipe, the positive electrode is connected with the auxiliary anode, the auxiliary anode is also inserted into the hydrated salt phase change material and is electrically isolated from the metal liner and the heat exchange metal coil pipe, and the reference electrode is inserted into the heat storage medium and is connected with the positive electrode or the negative electrode of external potential testing equipment during measurement;
the hydrated salt phase change material is one or a combination of a plurality of lithium hydroxide, sodium hydroxide monohydrate or barium hydroxide octahydrate;
the metal liner is made of stainless steel, and the stainless steel is selected from one or a combination of a plurality of stainless steel 201, stainless steel 304 or stainless steel 316;
the heat exchange metal coil is a copper coil or a copper alloy coil;
the larger the protected area ratio of the metal liner to the heat exchange metal coil is, the larger the protection current density output by the current power supply is, specifically:
when the protected area ratio of the metal liner to the heat exchange metal coil is 9: at 10, the protection current density of the output of the direct current power supply is 46mA/m 2 ，
When the protected area ratio of the metal liner to the heat exchange metal coil is 4:3, the protection current density output by the direct current power supply is 54mA/m 2 。
2. The electronic anode protection corrosion protection device of the phase change heat storage equipment according to claim 1, wherein the ripple coefficient of the direct current power supply is less than 5%, and the electronic anode protection corrosion protection device is one or a combination of a plurality of potentiostat, a galvanostat, a direct current constant current power supply, a direct current constant voltage power supply, a direct current power supply for LED illumination or a power adapter.
3. The device for protecting the electronic anode of the phase-change heat storage equipment according to claim 2, wherein the direct-current power supply is a direct-current constant-current power supply or a direct-current constant-voltage power supply.
4. The electronic anode protection anticorrosion device of the phase change heat storage equipment according to claim 1, wherein the auxiliary anode is one or a combination of a plurality of pure nickel, nickel-chromium alloy, nickel-silicon alloy, pure tungsten, tungsten alloy, platinum-niobium or platinum-titanium;
the reference electrode is one or the combination of a plurality of pure nickel, nichrome, nickel-silicon alloy, platinum, platinized niobium or platinized titanium.
5. The device for protecting and corrosion preventing an electronic anode of a phase change heat storage device according to claim 1, wherein the auxiliary anode is sleeved with an insulating sleeve which is electrically insulated from the metal liner and the heat exchange metal coil, and the insulating sleeve is provided with an opening and enables the auxiliary anode to be in contact with the hydrated salt phase change material.
6. The device for protecting and corrosion preventing an electronic anode of a phase change heat storage apparatus according to claim 1, wherein the auxiliary anode is cylindrical or strip-shaped;
the metal liner is round or square.
7. An electron anode protection corrosion protection method for a phase change heat storage device based on the electron anode protection corrosion protection device according to claim 1, wherein the phase change heat storage device comprises a metal liner and a heat exchange metal coil arranged in the metal liner, and a hydrated salt phase change material serving as a heat storage medium is further contained in the metal liner, and the method comprises the following steps:
(1) The method comprises the steps of respectively connecting a metal liner and a heat exchange metal coil with a negative electrode of a direct current power supply by adopting a lead, simultaneously connecting a positive electrode of the direct current power supply with an auxiliary anode inserted into water and salt phase change materials, keeping the auxiliary anode and the metal liner and the heat exchange metal coil in electric insulation isolation, and then inserting a reference electrode connected with the positive electrode or the negative electrode of external potential testing equipment into the water and salt phase change materials to complete the construction of an electronic anode protection system;
(2) And starting a direct-current power supply, and outputting a set protection current density, namely, realizing the anti-corrosion protection of the phase-change heat storage equipment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711016066.XA CN109706457B (en) | 2017-10-26 | 2017-10-26 | Electronic anode protection anti-corrosion device and method for phase change heat storage equipment |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201711016066.XA CN109706457B (en) | 2017-10-26 | 2017-10-26 | Electronic anode protection anti-corrosion device and method for phase change heat storage equipment |
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| Publication Number | Publication Date |
|---|---|
| CN109706457A CN109706457A (en) | 2019-05-03 |
| CN109706457B true CN109706457B (en) | 2023-10-20 |
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