Indirect cooling circulating water pure aluminum corrosion monitoring probe, manufacturing method thereof and monitoring system

Abstract

The invention provides an intercooling circulating water pure aluminum corrosion monitoring probe, a manufacturing method thereof and a monitoring system. The intercooling circulating water pure aluminum corrosion monitoring probe comprises a wire part, an internal packaging part and an external packaging part, the wire component comprises a high-temperature wire, a measurement test piece, a compensation test piece, a four-core isolation seat and a six-core glass sintering aviation plug; the high-temperature wire is connected with the measuring test piece in a crimping manner; the high-temperature wire is connected with the compensation test piece in a crimping manner; the stainless steel probe in the four-core isolation seat is connected with the high-temperature wire in a welding manner; the six-core glass sintering aviation plug is connected with the high-temperature wire in a welding mode. The internal packaging part is used for supporting the measurement test piece, the compensation test piece and the high-temperature wire and isolating an external corrosive medium; and the external packaging part is used for packaging and protecting the measuring test piece, the compensation test piece and the high-temperature wire. According to the application, the online monitoring of the aluminum corrosion of the indirect cooling circulating water can be realized, the real-time online corrosion data of the aluminum radiator can be obtained, and a powerful guarantee is provided for the safe operation of an indirect cooling system.

Description

Technical Field

[0001] The present application relates to the field of power plant operation and maintenance, and specifically to a pure aluminum corrosion monitoring probe for intercooling circulating water, a manufacturing method thereof, and a monitoring system. Background Art

[0002] Corrosion and damage of aluminum radiators in SCAL type intercooling systems will cause circulating water leakage, affecting the safe and stable operation of thermal power plants. In order to reduce the corrosion rate of materials in the system, the system uses desalted water as circulating water, but the corrosion products of carbon steel will pollute the circulating water quality. At the same time, the corrosion products of carbon steel will adhere to the surface of the aluminum tube, accelerating the corrosion of the aluminum tube. Intercooling systems generally use 1050A pure aluminum radiators, and the circulating water pipelines are carbon steel pipelines. Since carbon steel and aluminum are two metals with very different chemical and electrochemical properties, the traditional method of adding alkalizers to carbon steel for corrosion protection is not applicable here. In addition, most intercooling systems do not have water purification and regulation facilities designed in the initial design stage, which also brings difficulties to the water quality control and corrosion protection of the intercooling circulating water system. In recent years, some intercooling circulation units have suffered serious accidents of air-cooled radiator leakage after commissioning.

[0003] At present, the existing corrosion control technologies for SCAL type intercooling systems mainly include: 1) improving the circulating water quality by exchanging a large amount of water; 2) adding reducing agent hydrazine to remove oxygen and reduce oxygen corrosion, but it destroys the compactness of the iron oxide film on the surface of carbon steel, resulting in an increase in the iron content in the water; 3) cationic bed bypass treatment, which is mainly to remove cations in the water and filter some impurities to prevent the pH value of the system from being too high and causing alkaline corrosion of aluminum; 4) small mixed bed bypass treatment, which adds mixed bed treatment on the basis of cationic bed bypass treatment, and removes cations and anions in the water at the same time to achieve the purpose of purifying water quality, but this method also has limitations. First, the water volume of the small mixed bed bypass is limited, which is a drop in the bucket for the entire circulating water system of tens of thousands of tons; second, it cannot solve the fundamental problem of corrosion. As long as there is cathode depolarizer oxygen, carbon steel corrosion will continue; 5) adding corrosion inhibitors, special corrosion inhibitors for the corrosion of carbon steel and pure aluminum materials in SCAL type intercooling systems, slowing down system corrosion, but this method is still in the laboratory research stage and has not yet been widely used in engineering. Summary of the invention

[0004] In response to the problems in the prior art, the present application provides a pure aluminum corrosion monitoring probe for indirect cooling circulating water, its manufacturing method and monitoring system, which can realize online monitoring of aluminum corrosion in indirect cooling circulating water, obtain real-time online corrosion data of the aluminum radiator, sense the real-time operating status of the aluminum radiator, and provide strong guarantee for the safe operation of the indirect cooling system.

[0005] In order to solve the above technical problems, this application provides the following technical solutions:

[0006] In a first aspect, the present application provides a pure aluminum corrosion monitoring probe for indirect cooling circulating water, comprising: a conductor component, an internal packaging component, and an external packaging component;

[0007] The conductor components include a high-temperature conductor, a measuring test piece, a compensating test piece, a four-core isolation seat and a six-core glass sintered aviation plug; the high-temperature conductor is connected to the measuring test piece by crimping; the high-temperature conductor is connected to the compensating test piece by crimping; the stainless steel probe in the four-core isolation seat is connected to the high-temperature conductor by welding; the six-core glass sintered aviation plug is connected to the high-temperature conductor by welding;

[0008] The internal packaging component is used to support the measuring test piece, the compensating test piece and the high-temperature wire, and isolate the external corrosive medium;

[0009] The external packaging component is used to package and protect the measuring test piece, the compensating test piece and the high-temperature wire.

[0010] Furthermore, the internal packaging components include high temperature resistant glue, potting glue, four-core glass sintering, six-core glass sintering and supporting keel;

[0011] The high temperature resistant glue is used to seal and wrap the measuring test piece to isolate it from external corrosive media;

[0012] The potting glue is used to fill the corresponding area of ​​the compensation test piece to fix the wires and crimping terminals in the area;

[0013] The four-core glass sintering is used to fix the four needles in the four-core isolation seat in the hollow position of the four-core isolation seat;

[0014] The six-core glass sinter is used to fix the six needles in the six-core glass sinter aviation plug in the hollow position of the six-core glass sinter aviation plug;

[0015] The supporting keel is used to support the compensation test piece and the high temperature wire.

[0016] Furthermore, the external packaging components include a test piece sheath, a transition tube and a probe rod;

[0017] Wherein, one side of the test piece sheath is open and in contact with the external corrosive medium, and the other side is protected by stainless steel material to provide shell protection for the measuring test piece;

[0018] The transition tube is used to encapsulate and protect the compensation test piece, the high-temperature wire, and the crimping terminal;

[0019] The probe rod is used to package and protect the high-temperature wire.

[0020] In a second aspect, the present application provides a method for manufacturing the indirect cooling circulating water pure aluminum corrosion monitoring probe as described above, comprising:

[0021] The four end pins of the measuring test piece and the two ends of the compensation test piece are connected to the leads of the four-core isolation seat and the high-temperature wire by means of screw crimping;

[0022] Filling the inside of the crimping terminal with conductive glue to reduce the contact resistance; wherein, before filling the conductive glue, each crimping screw cap is plastic-sealed;

[0023] Weld the test piece sheath and perform waveform detection to ensure that the waveforms of the measurement test piece and the compensation test piece are normal;

[0024] The compensation test piece and high temperature wire are covered with double-layer asbestos tube to isolate them from the probe shell;

[0025] Weld the transition pipe and perform waveform detection to ensure that the waveforms of the measuring test piece and the compensation test piece are normal;

[0026] The measuring test piece is filled with high temperature resistant sealant, and waveform detection is performed after sealing to ensure that the waveforms of the measuring test piece and the compensation test piece are normal;

[0027] Weld the six-core glass sintered aviation plug at the tail and perform waveform detection after welding to ensure that the waveforms of the measurement test piece and the compensation test piece are normal.

[0028] Furthermore, the measuring test piece is a rectangular parallelepiped structure; wherein one side of the rectangular parallelepiped is in contact with the external corrosive medium.

[0029] Furthermore, the corrosion loss amount can be obtained by the change of the voltage signal after the excitation signal is applied to one side of the cuboid.

[0030] In a third aspect, the present application provides an indirect cooling circulating water pure aluminum corrosion monitoring system, comprising:

[0031] Indirect cooling circulating water pure aluminum corrosion monitoring probe; wherein, the indirect cooling circulating water pure aluminum corrosion monitoring probe comprises a conductor component, an internal packaging component and an external packaging component; the conductor component comprises a high-temperature conductor, a measuring test piece, a compensating test piece, a four-core isolation seat and a six-core glass sintered aviation plug; the high-temperature conductor is connected to the measuring test piece by crimping; the high-temperature conductor is connected to the compensating test piece by crimping; the stainless steel probe in the four-core isolation seat is connected to the high-temperature conductor by welding; the six-core glass sintered aviation plug is connected to the high-temperature conductor by welding; the internal packaging component is used to support the measuring test piece, the compensating test piece and the high-temperature conductor, and isolate the external corrosive medium; the external packaging component is used to encapsulate and protect the measuring test piece, the compensating test piece and the high-temperature conductor;

[0032] A data collector is used to collect corrosion signals in the intercooling circulating water system, and amplify, convert analog to digital and output the corrosion signals;

[0033] A data converter receives the output signal of the data collector, converts the output signal into a communication protocol and then sends it;

[0034] The corrosion measurement controller is used to send a measurement instruction to the data collector so that the data collector starts measuring after receiving the measurement instruction and uploads the measured corrosion signal after the measurement is completed; it is also used to calculate the average corrosion rate of the measurement specimen at the monitoring point based on the corrosion signal and the slope of the corrosion loss curve.

[0035] In view of the problems in the prior art, the pure aluminum corrosion monitoring probe for intercooling circulating water, its manufacturing method and monitoring system provided by this application can realize online monitoring of aluminum corrosion in intercooling circulating water, obtain real-time online corrosion data of aluminum radiators, sense the real-time operating status of aluminum radiators, and provide strong guarantee for the safe operation of intercooling systems. Specifically, it breaks through the limitation of the prior art that it can only monitor the corrosion of steel pipeline systems, effectively solves the problem that the aluminum measurement test piece and the probe body cannot be welded, has the advantages of unique structural design, high reliability, and strong anti-interference ability of measurement signals, and can adapt to a variety of different corrosion systems. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0037] Figure 1 One of the structural diagrams of the indirect cooling circulating water pure aluminum corrosion monitoring probe in the embodiment of the present application;

[0038] Figure 2 The second structural diagram of the indirect cooling circulating water pure aluminum corrosion monitoring probe in the embodiment of the present application;

[0039] Figure 3 Illustration of an I-shaped probe in an embodiment of the present application;

[0040] Figure 4 System structure diagram in the embodiment of the present application;

[0041] Figure 5 System measurement principle diagram in the embodiment of the present application;

[0042] Figure 6Schematic diagram of inductance measurement circuit in the embodiment of the present application;

[0043] Figure 7 Schematic diagram of a dynamic simulation device for an intermediate cold water system in an embodiment of the present application;

[0044] Figure 8 Schematic diagram of average corrosion rate of the intercooler system in different operating conditions during the time period according to the embodiment of the present application;

[0045] Fig. 9 Schematic diagram of the orientation of the I-shaped probe pins in the embodiment of the present application. DETAILED DESCRIPTION

[0046] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0047] In one embodiment, see Figure 1 In order to realize online monitoring of aluminum corrosion in intercooling circulating water, obtain real-time online corrosion data of aluminum radiator, perceive the real-time operation status of aluminum radiator, and provide strong guarantee for the safe operation of intercooling system, the present application provides an intercooling circulating water pure aluminum corrosion monitoring probe, including: wire component, internal packaging component and external packaging component;

[0048] The conductor components include a high-temperature conductor 113, a measuring test piece 119, a compensating test piece 116, a four-core isolation seat 117, and a six-core glass sintered aviation plug 111; the high-temperature conductor 113 is connected to the measuring test piece 119 by crimping; the high-temperature conductor 113 is connected to the compensating test piece 116 by crimping; the stainless steel probe in the four-core isolation seat 117 is connected to the high-temperature conductor 113 by welding; the six-core glass sintered aviation plug 111 is connected to the high-temperature conductor 113 by welding;

[0049] The internal packaging component is used to support the measuring test piece 119, the compensating test piece 116 and the high-temperature wire 113, and isolate the external corrosive medium;

[0050] The external packaging component is used to package and protect the measurement test piece 119 , the compensation test piece 116 and the high-temperature wire 113 .

[0051] Specifically, the measuring specimen 119 (except necessary wiring pins) is a rectangular parallelepiped with six faces, five of which are isolated and packaged so as not to contact the external corrosive medium, and only one face is exposed (or open) to contact the external corrosive medium. By measuring the change in the voltage signal after an excitation signal is applied to this face, the amount of corrosion loss can be obtained.

[0052] The internal packaging components include high temperature resistant glue 118, potting glue 115, four-core glass sintering, six-core glass sintering and supporting keels; wherein the high temperature resistant glue 118 is used to seal and wrap a portion of the measuring test piece 119 (specifically the five surfaces mentioned above) to isolate the external corrosive medium; the potting glue 115 is used to fill the corresponding area of ​​the compensation test piece 116 (including the internal area around the compensation test piece 116, which is filled with high temperature resistant glue 118) to fix the wires and crimping terminals in the area; the four-core glass sintering is used to fix the four needles in the four-core isolation seat 117 to the hollow position of the four-core isolation seat 117; the six-core glass sintering is used to fix the six needles in the six-core glass sintering aviation plug 111 to the hollow position of the six-core glass sintering aviation plug 111; the supporting keel is used to support the compensation test piece 116 and the high-temperature wire 113.

[0053] Specifically, the external packaging component includes a test piece sheath 120, a transition tube 114 and a probe rod 112 that are interconnected; wherein the test piece sheath 120 has two side surfaces, one of which is open to allow the measuring test piece 119 to contact the external corrosive medium; the other side surface is protected by stainless steel material to provide an outer shell protection for the measuring test piece 119; the transition tube 114 is used to package and protect the compensation test piece 116, the high-temperature wire 113, and the crimping terminal; the probe rod 112 is used to package and protect the high-temperature wire 113.

[0054] It is understandable that online corrosion monitoring of aluminum corrosion in indirect air-cooled circulating water can dynamically and real-time understand the occurrence of corrosion in the metal pipeline system, provide corrosion warning information, assist in anti-corrosion regulation, assist in the treatment of corrosion hazards, and ensure the safe operation of the system. The embodiment of the present application designs an online corrosion monitoring probe and system for a SCAL type indirect air-cooled aluminum heat dissipation system.

[0055] At present, the corrosive operation monitoring of indirect cooling circulating water is mainly achieved through the monitoring of water quality indicators. According to the industry standard DL / T 2295-2021 "Guidelines for Corrosion Control of Circulating Cooling Water Systems of Surface Indirect Air-Cooled Units", if the water quality indicators such as conductivity, pH value, and iron and aluminum content of indirect cooling water exceed the standard values, it is considered that the indirect cooling water system is likely to be corroded. However, water quality indicators are indirect indicators for measuring the corrosion of indirect cooling water systems and cannot reflect the actual corrosion rate of metal materials in indirect cooling water media. The use of online corrosion monitoring technology can effectively monitor the corrosion rate and change trend of metal materials in indirect cooling water media.

[0056] In order to monitor the pure aluminum corrosion of SCAL type intercooling circulating water, the present application provides a pure aluminum corrosion monitoring probe for intercooling circulating water. The present application embodiment also includes an online monitoring sensor for pure aluminum and carbon steel corrosion, and the monitoring system is applied to simulate the SCAL type intercooling circulating water system to provide an online monitoring means when the water condition is adjusted.

[0057] Specifically, the structure of the indirect cooling circulating water pure aluminum corrosion monitoring probe can be found in Figure 1 As shown, it mainly includes three major components, a wire component, an internal packaging component and an external packaging component.

[0058] Among them, the test piece sheath 120, the transition tube 114, and the probe rod 112 are connected; the measuring test piece 119 and the high temperature resistant glue 118 are wrapped by the test piece sheath 120, the compensation test piece 116 and the potting glue 115 are wrapped by the transition tube 114, and the wire is wrapped as a whole by the probe rod 112, the transition tube 114, and the test piece sheath 120.

[0059] First, the conductor component includes a high-temperature conductor 113 , a measuring test piece 119 , a compensating test piece 116 , a four-core isolation seat 117 and a six-core glass sintered aviation plug 111 .

[0060] (1) Connection method between the measuring test piece 119 and the high-temperature wire 113: The connection between the copper wire of the high-temperature wire 113 and the aluminum material of the measuring test piece 119 is achieved by crimping. Because silver soldering or tin soldering cannot be performed on the surface of the aluminum sheet, the embodiment of the present application adopts a crimping method and connects diagonally. The so-called "connected diagonally" means that the copper wire of the high-temperature wire 113 is connected from one contact point of the measuring test piece 119 (rectangle) (corresponding to a vertex A of the rectangular parallelepiped) and is connected from another contact point of the measuring test piece 119 (rectangle) (corresponding to another vertex B of the rectangular parallelepiped). Among them, vertex A and vertex B should be on the same face of the rectangular parallelepiped, and the mathematical connection line between vertex A and vertex B is the diagonal of the face.

[0061] (2) Connection method of compensation test piece 116 and high temperature wire 113: The copper wire of high temperature wire 113 and the aluminum material of compensation test piece 116 are connected by crimping. Because the surface of aluminum sheet cannot be silver-soldered or tin-soldered, the embodiment of the present application adopts crimping and connects diagonally.

[0062] (3) Connection method between the four-core isolation seat 117 and the wire: The stainless steel probe in the four-core isolation seat 117 and the copper wire of the high-temperature wire 113 are connected by welding.

[0063] (4) Connection method between the six-core glass sintered aviation plug 111 and the wire: The six-core glass sintered aviation plug 111 probe and the high-temperature wire 113 copper wire are connected by welding.

[0064] Second, internal packaging components, including high temperature resistant glue 118, potting glue 115, four-core glass sintering, six-core glass sintering and supporting keel.

[0065] (1) High temperature resistant glue 118: The high temperature resistant glue 118 is used to seal the 3 side faces and 2 end faces of the measuring specimen 119, leaving only one side face (for contacting the external corrosive medium) for measurement. It can be seen that the high temperature resistant glue plays a role in isolating the external corrosive medium.

[0066] (2) Potting glue 115: There are a large number of wires and crimping terminals in the compensation test piece 116 area. The potting glue 115 is used to fill the area to fix the wires and crimping terminals therein.

[0067] (3) Four-core glass sintering: There are four needles in the hollow of the four-core isolation seat 117. Glass sintering is used to fix the four needles in the hollow position of the four-core isolation seat 117 to prevent the needles from contacting the side walls of the four-core isolation seat 117 and causing measurement errors, and play a role in fixing and insulation. Among them, the four needles play the role of electrical connection between components, and the four needles correspond to four wires, including: measuring the current in of the test piece 119, measuring the current out of the test piece 119, measuring the voltage of the test piece 119 to collect signals on one side, and measuring the voltage of the test piece 119 to collect signals on the other side.

[0068] (4) Six-core glass sintering: The six-core glass sintering aviation plug 111 has six hollow needles. Glass sintering is used to fix the six needles in the hollow position of the aviation plug to prevent the needles from contacting the side wall of the aviation plug and causing measurement errors, and play a role in fixing and insulation. Among them, the six needles play the role of electrical connection between components, and the six needles correspond to six wires, including: measuring / compensating test piece 116 current in, measuring / compensating test piece 116 current out, measuring test piece 119 voltage collection signal on one side, measuring test piece 119 voltage collection signal on the other side, compensation test piece 116 voltage collection signal on one side, and compensation test piece 116 voltage collection signal on one side.

[0069] (5) Support keel: The compensating test piece 116 is relatively soft, so a support keel is used to support the compensating test piece 116 and the high-temperature wire 113 to play a supporting role. The support keel is inside the transition tube 114 to support the compensating test piece 116 and the high-temperature wire 113.

[0070] Third, the external packaging components include a test piece sheath 120 , a transition tube 114 and a probe rod 112 .

[0071] (1) Test piece sheath 120: The test piece sheath 120 has an outer diameter of 28 mm, and its side is open (open) to contact the external corrosive medium. The remaining part (referring to the two end faces and another side face, and the side that is consistent with the direction of the measuring test piece 119 is the open side face, and the opposite side is the protective side face) is protected by stainless steel material, which plays the role of outer shell protection for the measuring test piece 119.

[0072] (2) Transition tube 114: The outer diameter of the transition tube 114 is 24 mm, and the internal compensation test piece 116, high-temperature wire 113, and crimping terminal are encapsulated and protected by an outer shell.

[0073] (3) Probe rod 112: The probe rod 112 has an outer diameter of 16 mm and encapsulates the internal high-temperature wire 113 and is protected by an outer shell.

[0074] The following describes the direction of the electrical signal in the pure aluminum corrosion monitoring probe of the intercooler circulating water.

[0075] Specifically, the voltage signals at both ends of the measuring test strip 119 and the voltage signals at both ends of the compensating test strip 116 are collected; the applied current can form a series loop, so that the measuring test strip 119 and the compensating test strip 116 are connected in series to form a complete loop.

[0076] ① Current signal direction

[0077] The current enters the high-temperature wire 113 → six-core glass sintered aviation plug 111 → high-temperature wire 113 → four-core isolation seat 117 → high-temperature wire 113 → measurement test piece 119 (lower left contact) → measurement test piece 119 (upper right contact) → high-temperature wire 113 → four-core isolation seat 117 → high-temperature wire 113 → compensation test piece 116 (lower right contact) → compensation test piece 116 (upper left contact) → high-temperature wire 113 → six-core glass sintered aviation plug 111 → high-temperature wire 113 → current flows out. For the orientation of the contact point, see Fig. 9 shown.

[0078] ② Voltage acquisition signal direction

[0079] (1) Measurement of the voltage signal of the test piece 119:

[0080] One end of the voltage signal → high temperature wire 113 → six-core glass sintered aviation plug 111 → high temperature wire 113 → four-core isolation seat 117 → measurement test piece 119 (upper left contact) → measurement test piece 119 (lower right contact) → high temperature wire 113 → four-core isolation seat 117 → high temperature wire 113 → six-core glass sintered aviation plug 111 → high temperature wire 113 → the other end of the voltage signal.

[0081] (2) Compensation test piece 116 voltage signal acquisition:

[0082] One end of the voltage signal → high temperature wire 113 → six-core glass sintered aviation plug 111 → high temperature wire 113 → compensation test piece 116 (lower left contact) → compensation test piece 116 (upper right contact) → high temperature wire 113 → six-core glass sintered aviation plug 111 → high temperature wire 113 → the other end of the voltage signal.

[0083] It should be noted that the dimensions of the aluminum sheet probe measurement test piece 119 and the compensation test piece 116 are designed as follows: Based on the resistance values ​​of the steel sheet probe measurement test piece 119 and the compensation test piece 116, the dimensions of the aluminum sheet probe measurement test piece 119 and the compensation test piece 116 of the probe data collector are inferred. Since the specifications of the blank tube material for making the probe test piece are 25.1mm outer diameter × 1mm wall thickness, the thickness of the aluminum test piece is fixed at 1mm, and the width is 2mm. Based on the resistivity of steel and aluminum, the length of the aluminum measurement test piece 119 is calculated to be 100mm. These values ​​are calculated by referring to formula (1) and formula (2) below. Formula (1) and formula (2) specifically reflect the relationship between resistance, resistivity, length, and cross-sectional area.

[0084] Since the aluminum measuring test piece 119 is too long, the front end of the probe needs to pass through a DN40 or DN50 valve, so the aluminum measuring test piece 119 cannot be set on the front end of the probe like the measuring test piece 119 of the steel sheet probe, but can only be set on the side of the test piece sheath 120. It is connected through a DN40 or DN50 flange. In order to maintain the low resistance of the aluminum measuring test piece 119, its cross-sectional area must be large enough. The probe that penetrates into the pipeline is very long, and it is not enough to install it at the front end, so it can only be installed on the side.

[0085] It should also be noted that the aluminum sheet probe and the sealing stuffing box (referring to the potting glue 115) can be disassembled and assembled under pressure, see Figure 2 As shown. Since the inner diameter of the conventional sealing stuffing box is 26mm, which is smaller than the outer diameter of the front end of the aluminum probe (28mm), and the front end of the aluminum probe is longer, the inner hole of the sealing stuffing box needs to be thickened and lengthened to ensure that after the front end of the aluminum probe is retracted into the sealing stuffing box, the front end of the aluminum probe can be above the valve core without hindering the closing of the valve.

[0086] From the above description, it can be seen that the pure aluminum corrosion monitoring probe for intercooling circulating water provided by the present application can realize online monitoring of aluminum corrosion in intercooling circulating water, obtain real-time online corrosion data of aluminum radiators, sense the real-time operating status of aluminum radiators, and provide strong guarantee for the safe operation of intercooling systems. Specifically, it breaks through the limitation of the prior art that it can only monitor the corrosion of steel pipeline systems, effectively solves the problem that the aluminum measurement test piece 119 and the probe body cannot be welded, has the advantages of unique structural design, high reliability, and strong anti-interference ability of measurement signals, and can adapt to a variety of different corrosion systems.

[0087] In one embodiment, in order to realize online monitoring of aluminum corrosion in indirect cooling circulating water, obtain real-time online corrosion data of aluminum radiator, perceive the real-time operation status of aluminum radiator, and provide strong guarantee for the safe operation of indirect cooling system, the present application provides a method for manufacturing pure aluminum corrosion monitoring probe for indirect cooling circulating water as described, including:

[0088] S101: Connect the four end pins of the measuring test piece 119 and the two ends of the compensation test piece 116 to the leads of the four-core isolation seat 117 and the high-temperature wire 113 by means of screw crimping;

[0089] S102: filling the inside of the crimping terminal with conductive glue to reduce contact resistance; wherein, before filling the conductive glue, each crimping screw cap is plastic-sealed;

[0090] S103: welding the test piece sheath 120 and performing waveform detection to ensure that the waveforms of the measuring test piece 119 and the compensating test piece 116 are normal;

[0091] S104: Cover the compensation test piece 116 and the high-temperature wire 113 with a double-layer asbestos tube to isolate them from the probe housing (also called the housing of the transition tube 114);

[0092] S105: welding the transition pipe and performing waveform detection to ensure that the waveforms of the measuring test piece 119 and the compensation test piece 116 are normal;

[0093] S106: Filling the measuring test piece 119 with a high temperature resistant sealant, and performing waveform detection after sealing to ensure that the waveforms of the measuring test piece 119 and the compensation test piece 116 are normal;

[0094] S107: Weld the tail six-core glass sintered aviation plug 111, and perform waveform detection after welding to ensure that the waveforms of the measuring test piece 119 and the compensation test piece 116 are normal.

[0095] It can be understood that the manufacturing method of the indirect cooling circulating water pure aluminum corrosion monitoring probe is mainly reflected in: the connection and fixing process of the aluminum sheet probe measurement test piece 119, the compensation test piece 116 and the probe body, which is specifically as follows:

[0096] (1) Since the aluminum test piece 119 and the compensation test piece 116 cannot be directly silver-welded or tin-welded with the leads and wires of the four-core isolation seat 117 like the steel test piece, the aluminum test piece 119 is designed to be an I-shaped (see Figure 3 The four ends of the I-shaped aluminum measuring test piece 119 and the two ends of the aluminum compensating test piece 116 are connected to the leads of the four-core isolation seat 117 and the high-temperature wire 113 by screw crimping. The waveforms of the aluminum measuring test piece 119 and the compensating test piece 116 after crimping are shown in the figure.

[0097] (2) To prevent the large contact resistance of the screw crimping method from affecting the measurement, conductive glue is filled inside the crimping terminal to reduce the contact resistance. Before filling the conductive glue, each crimping screw cap is plastic-sealed to prevent the screw cap from contacting the probe housing and affecting the measurement. The waveforms of the aluminum measurement test piece 119 and the compensation test piece 116 after filling the conductive glue are shown in the figure.

[0098] (3) After welding the test piece sheath 120, waveform detection is performed, and the waveforms of the aluminum measurement test piece 119 and the compensation test piece 116 are both normal. Among them, the test piece sheath 120 is welded to the transition pipe.

[0099] (4) The compensation test piece 116 and the conductor are integrally covered with a double-layer asbestos tube to isolate them from the probe housing. The waveform test is then welded to the transition tube and then tested. The waveforms of the aluminum measurement test piece 119 and the compensation test piece 116 are both normal, as shown in the figure.

[0100] (5) The measuring test piece 119 is sealed with a high temperature resistant sealant, and a waveform test is performed after sealing. The waveforms of the measuring test piece 119 and the compensation test piece 116 are both normal, as shown in the figure.

[0101] (6) The six-core glass sintered aviation plug 111 at the tail is welded and waveform detection is performed after welding. The waveforms of the measurement test piece 119 and the compensation test piece 116 are both normal.

[0102] Finally, the manufacture of pure aluminum corrosion monitoring probe for indirect cooling circulating water was completed.

[0103] It should be noted that the difficulties in processing and manufacturing aluminum probes are as follows:

[0104] (1) The low resistivity of pure aluminum causes the specimen size to be too large

[0105] Since the resistivity of aluminum is much smaller than that of steel, the thickness of the blank tube material for making the measuring test piece 119 and the compensating test piece 116 is 1mm. If the resistance of the test piece is too small and exceeds the measurement limit of the probe data acquisition circuit, the measurement cannot be performed. Therefore, the resistance value of the aluminum test piece must at least reach the resistance of the steel test piece. In the case of limited thickness and width, the length of the test piece can only be increased. If the aluminum measuring test piece 119 is set on the front end face of the probe like the steel sheet probe, it cannot pass through the DN40 or DN50 valve core due to the large diameter of the front end of the probe.

[0106] (2) Difference in melting point of pure aluminum welding

[0107] Since the melting point of aluminum is lower than that of silver welding rod, it cannot be directly connected to the four-core isolation seat 117 and the wire by silver welding like the steel test piece. If tin soldering is adopted, the surface of aluminum does not stick to tin and connection cannot be achieved.

[0108] The solutions and effects corresponding to the difficulties are as follows:

[0109] (1) To solve the problem that the test piece size is too large due to the low resistivity of pure aluminum, the measuring aluminum sheet is set on the side of the test piece sheath 120 to ensure that the front end diameter of the aluminum sheet probe is the same as the front end diameter of the steel sheet probe, so that it can pass through the DN40 or DN50 valve core smoothly.

[0110] (2) Difficulties in welding pure aluminum. In one embodiment, it is considered to overlap the two ends of the aluminum test piece with the wires of the four-core isolation seat 117, then use a copper tube to cover the overlapped part, and then use a crimping pliers to compress the copper tube to achieve connection, and then fill the gap between the copper tube and the aluminum test piece and the wire with solder to strengthen the connection. However, when manufacturing the semi-finished product, the two ends of the aluminum test piece and the wires of the four-core isolation seat 117 may have poor contact, resulting in incorrect measurement waveforms of the probe data collector. In a preferred embodiment, the aluminum measurement test piece 119 is designed to be an I-shaped (see Figure 3 ), the aluminum compensation test piece 116 is in the shape of a long strip. The four end pins of the I-shaped aluminum measurement test piece 119 and the two ends of the aluminum compensation test piece 116 are connected to the leads of the four-core isolation seat 117 and the high-temperature wire 113 by screw crimping. In order to prevent the large contact resistance of the screw crimping method from affecting the measurement, the internal of the crimping terminal is filled with conductive glue to reduce the contact resistance and ensure the stability of the measurement.

[0111] From the above description, it can be seen that the manufacturing method of the pure aluminum corrosion monitoring probe for intercooling circulating water provided by the present application can realize online monitoring of aluminum corrosion in intercooling circulating water, obtain real-time online corrosion data of aluminum radiators, sense the real-time operating status of aluminum radiators, and provide strong guarantee for the safe operation of intercooling systems. Specifically, it breaks through the limitation of the prior art that it can only monitor the corrosion of steel pipeline systems, effectively solves the problem that the aluminum measurement test piece 119 and the probe body cannot be welded, has the advantages of unique structural design, high reliability, and strong anti-interference ability of measurement signals, and can adapt to a variety of different corrosion systems.

[0112] In one embodiment, in order to realize online monitoring of aluminum corrosion in indirect cooling circulating water, obtain real-time online corrosion data of aluminum radiator, perceive the real-time operation status of aluminum radiator, and provide strong guarantee for the safe operation of indirect cooling system, the present application provides a pure aluminum corrosion monitoring system for indirect cooling circulating water as described, including:

[0113] A pure aluminum corrosion monitoring probe for indirect cooling circulating water; wherein the pure aluminum corrosion monitoring probe for indirect cooling circulating water comprises a conductor component, an internal packaging component and an external packaging component; the conductor component comprises a high-temperature conductor 113, a measuring test piece 119, a compensating test piece 116, a four-core isolation seat 117 and a six-core glass sintered aviation plug 111; the high-temperature conductor 113 is connected to the measuring test piece 119 by crimping; the high-temperature conductor 113 is connected to the compensating test piece 116 by crimping; the stainless steel probe in the four-core isolation seat 117 is connected to the high-temperature conductor 113 by welding; the six-core glass sintered aviation plug 111 is connected to the high-temperature conductor 113 by welding; the internal packaging component is used to support the measuring test piece 119, the compensating test piece 116 and the high-temperature conductor 113, and isolate the external corrosive medium; the external packaging component is used to encapsulate and protect the measuring test piece 119, the compensating test piece 116 and the high-temperature conductor 113;

[0114] A data collector is used to collect corrosion signals in the intercooling circulating water system, and amplify, convert analog to digital and output the corrosion signals;

[0115] A data converter receives the output signal of the data collector, converts the output signal into a communication protocol and then sends it;

[0116] The corrosion measurement controller is used to send a measurement instruction to the data collector so that the data collector starts measuring after receiving the measurement instruction and uploads the measured corrosion signal after the measurement is completed; it is also used to calculate the average corrosion rate of the measuring specimen 119 at the monitoring point based on the corrosion signal and the slope of the corrosion loss curve.

[0117] It is understood that the executive body of the monitoring system can be a corrosion measurement controller, which can actually be a computer. For a system structure diagram, see Figure 4 shown.

[0118] In order to better explain this monitoring system, the corrosion measurement principle is first explained:

[0119] The measuring strip 119 of the probe is made of the same material as the monitored system. When the corrosive medium causes the measuring strip 119 to corrode and thin, the resistance value of the measuring strip 119 will change, and an AC induction signal will be applied to the sensor measuring strip 119. By measuring the change of the AC induction signal, the accumulated corrosion thinning over a period of time can be calculated, and the corrosion rate of the measuring element can be obtained, thereby indirectly reflecting the corrosion of the medium on the pipeline system.

[0120] The embodiment of the present application designs and develops a corrosion measurement probe based on the principle of resistance corrosion measurement. The corrosion rate is measured by measuring the resistance difference caused by the thinning amount of the electrode specimen before and after corrosion. Since the excitation signal uses an AC signal, it has strong anti-interference ability and the measurement accuracy can reach 30nm. The measuring electrode is composed of a corrosion specimen (also called a measuring specimen 119) and a compensation specimen 116. The system measures the resistance change value of the corrosion specimen relative to the compensation specimen 116, and then converts it into corrosion depth. The measurement principle is as follows:

[0121] The resistance of the compensation test piece 116 is calculated by formula (1), and the resistance of the corrosion test piece is calculated by formula (2).

[0122]

[0123]

[0124] The meanings of the symbols in the above formula (1) and (2) are as follows:

[0125] ρ0, ρ1 are the resistivities of the compensation test piece 116 and the corrosion test piece;

[0126] L0, L1 are the lengths of the compensation test piece 116 and the corrosion test piece;

[0127] a0, a1 are the widths of the compensation test piece 116 and the corrosion test piece;

[0128] b0, b1 are the thicknesses of the compensation test piece 116 and the corrosion test piece;

[0129] s0: cross-sectional area of ​​the compensation test piece;

[0130] s1: cross-sectional area of ​​the corrosion test piece;

[0131] K0: The aspect ratio of the compensation specimen;

[0132] K1: The aspect ratio of the corrosion test piece.

[0133] Since the compensation test piece 116 and the corrosion test piece are made from the same material, therefore:

[0134] ρ0=ρ1, let K0=K1, then: R0=K / b0; R1=K / b1

[0135] Taking R0 as the benchmark, measure the change of R1, which is the corrosion loss:

[0136] △R / R0=(R1-R0) / R0=R1 / R0-1=b0 / b1-1

[0137] b1 decreases as the metal corrodes, while b0 remains unchanged.

[0138] The compensation test piece 116 is used to compensate for temperature changes and serve as a reference for thickness comparison, which is different from the measurement principle of an ordinary resistance probe.

[0139] Figure 5 and Figure 6 The following are the system measurement principle and the inductance measurement circuit schematic diagram. Since the probe adopts tubular and sheet structures, the temperature compensation control of the probe is relatively ideal and the data fluctuation is small.

[0140] The inductance probe data collector adopts the master-slave structure of RS485 bus. RS485 bus is an international standard bus with mature technology, reliable operation, simple maintenance and low cost. RS485 transceiver adopts balanced transmission and differential reception technology, so it has a strong ability to suppress common mode interference. The receiver has high sensitivity and can detect voltages as low as 200mV. The transmission distance can reach 1200 meters. On-site wiring requires that the signal line and power line are as thick as possible and the wiring is as short as possible. According to the requirements of 485 bus, the collector is hung on the bus, but the branch structure is not adopted.

[0141] On this basis, the corrosion online monitoring system provided by this application includes a corrosion measurement probe (the probe provided by this application), a data collector, a data converter and a corrosion measurement controller (computer). It can realize the functions of establishing, operating, maintaining, handling abnormalities, collecting and processing data of the monitoring system, and the pressure-disassembly and assembly method is more convenient for maintenance and replacement. Figure 3 The figure shows the composition diagram of the corrosion online monitoring system. The functions of each part are as follows:

[0142] (1) Corrosion measurement probe: mainly composed of a measuring test piece 119 and a reference test piece (also called a compensation test piece 116). The measuring test piece 119 is in direct contact with the medium, and the change in its resistance reflects the corrosion loss of the material. The materials of the measuring test piece 119 and the reference test piece are consistent with the metal materials of the indoor cooling water system, namely 1050A pure aluminum and carbon steel.

[0143] (2) Data collector: It mainly completes the collection, amplification, conversion and output of on-site corrosion signals. It consists of signal acquisition circuit, amplification circuit A / D conversion circuit, communication circuit, power supply circuit and central processing unit.

[0144] (3) Data converter: The signal is transmitted to the "corrosion measurement controller (computer)". The data transmission and processing adopts the RS485 communication protocol conversion module, so that the computer can conveniently use the computer's serial communication interface and perform long-distance information transmission.

[0145] (4) Corrosion measurement controller (computer): All system operations are controlled by this component. The computer sends measurement instructions to the data collector. After receiving the measurement instructions, the data collector starts measuring. After the measurement is completed, the measured corrosion loss data (also called corrosion signal) is uploaded to present the corrosion loss value of the monitoring point, and the average corrosion rate of the measurement specimen 119 at the monitoring point is calculated from the slope of the corrosion loss curve. The curve shown in the figure is the corrosion loss measurement curve of 1050A aluminum in a SCAL type intercooler system. The straight line marked with the shaded area in the figure is the slope of the corrosion loss curve during a period of time. Its value is the average corrosion rate of aluminum in the intercooler system during this period, which is 0.0592mm / a.

[0146] In summary, the system provided by this application has the following advantages:

[0147] (1) Since the inductive probe uses AC signal for measurement, it has strong anti-interference ability. However, it is the first time that aluminum corrosion probe is used for monitoring. It breaks through the limitation that only steel pipeline corrosion can be monitored and solves the problem that the aluminum test piece and the probe body cannot be welded.

[0148] (2) Two glass sintered aviation plugs are used at the tail and front ends of the probe to ensure that even if the sealant at the front of the probe falls off, the medium cannot enter the probe body, the measuring test piece 119 and the compensation test piece 116 remain isolated, and the probe can still work normally without failure.

[0149] (3) The corrosion rate is calculated by measuring the corrosion thinning accumulation of the component over a period of time. It is an indirect reaction medium to the corrosion of the pipeline. It is independent of the corrosion system and can measure the corrosion of the liquid or gas phase. It can be applied to the electrolyte corrosion system and the electrolyte corrosion system.

[0150] An example of on-site installation of an online corrosion monitoring system is as follows:

[0151] The SCAL type intercooler circulating water corrosion online monitoring system provided by the present application is installed on the laboratory intercooler circulating water dynamic simulation device, which consists of a constant temperature water bath, a liquid flow meter, a digital thermometer, a carbon steel corrosion probe, a 1050A pure aluminum corrosion probe, a Q235 carbon steel sample tube, a pure aluminum sample tube, a 304 stainless steel sample tube, a pH meter, a conductivity meter, a dissolved oxygen monitor, an electrochemical workstation, an electrochemical test cell, an ion exchange resin tank, compressed nitrogen, etc. Figure 7 Schematic diagram of the dynamic simulation device for the indirect cooling water system.

[0152] exist Figure 7 Among them, Label 1: constant temperature water bath, Label 2: liquid flow meter, digital thermometer, Label 3: inductance probe, Label 4: low temperature inductance probe, Label 5: Q235B carbon steel, Label 6: 1050A pure aluminum tube, Label 7: 304 stainless steel tube, Label 8: hanging piece test, Label 9: low temperature constant temperature water bath, Label 10: industrial pH meter, Label 11: conductivity meter, Label 12: dissolved oxygen instrument, Label 13: electrochemical workstation, Label 14: electrochemical test cell, Label 15: ion exchange resin tank, Label 16: compressed nitrogen.

[0153] The installation of the corrosion online monitoring system includes the selection and fixation of the corrosion probe installation location, short pipe connection, valve installation, cable laying, etc. The measurement system adopts 485 bus transmission, T-type topology wiring structure, and the cable includes communication signal line and power line.

[0154] The circulation pipeline between the liquid flow meter and the corrosion sample tube adopts a circulation pool structure for the corrosion probe installation design, and the carbon steel and pure aluminum probe pipelines are connected in series. The size of the circulation pool for the carbon steel corrosion probe installation is (130mm high, 13mm inlet and outlet water diameter, 20mm inner diameter of the circulation pool), and the size of the circulation pool for the 1050A pure aluminum corrosion probe installation is (220mm high, 13mm inlet and outlet water diameter, 40mm inner diameter of the circulation pool). The probe is vertically inserted into the circulation pool, and the data collector is fixed at the tail end of the probe rod 112. The iron frame (1400mm high and 800mm wide) installs and fixes the two corrosion probes and the data collector, ensuring the stability of the corrosion online monitoring sensor.

[0155] For example, the measurement results of the 1050A pure aluminum corrosion online monitoring system are as follows:

[0156] The SCAL online monitoring system for cold corrosion measures the corrosion rate of 1050A pure aluminum during the preset period of the unit. The measurement frequency is one data point per minute. Figure 8 The data and curves measured during this period are as follows. The average corrosion rate is 0.0413 mm / a, and the fitting curve is as follows: Figure 8 shown.

[0157] The online monitoring data of corrosion under different working conditions are as follows:

[0158] The average corrosion rate of the indirect cooling system under different operating conditions and time periods can be found in Figure 8 As shown. Figure 8 It can be seen that the corrosion online monitoring system started collecting data from × / × / × to the end of online data collection on × / × / ×. The medium in which the corrosion probe was located experienced four working conditions, namely, in the atmosphere, in the water inlet state, system circulation operation, and system shutdown. From ×:×:× on × / × / × to ×:×:× on × / × / ×, it was in the atmosphere, with a pure aluminum corrosion rate of 0.0062 mm / a, and a carbon steel corrosion rate of 0.0101 mm / a; from ×:×:× on × / × / × to ×:× on × / × / ×, it was in water-influent state, with an aluminum corrosion rate of 0.0544 mm / a, and a carbon steel corrosion rate of 0.0245 mm / a; from ×:×:× on × / × / × to ×:× on × / × / ×, it was system circulation state, with an aluminum corrosion rate of 0.0363 mm / a, and a carbon steel corrosion rate of 0.2312 mm / a; from ×:×:× on × / × / × to ×:× on × / × / ×, it was system shutdown state, with an aluminum corrosion rate of 0.0001 mm / a, and a carbon steel corrosion rate of 0.0263 mm / a.

[0159] It can be seen that during the system cycle operation, the corrosion rate of carbon steel (0.2312 mm / a) is one order of magnitude higher than the corrosion rate of pure aluminum (0.0363 mm / a), and the carbon steel corrosion is serious.

[0160] Explanation of the comparison between online corrosion monitoring and coupon weight loss test:

[0161] From × / × to × / ×, under the test conditions of pH 6.11, dissolved oxygen 1.43 mg / L, conductivity 0.98 μS / cm, and temperature 45°C, a dynamic simulation of pure aluminum corrosion coupons and online monitoring tests in the SCAL type intercooling system was carried out, as shown in Table 1. As can be seen from Table 1, the corrosion rate of the pure aluminum coupon is 0.1134 mm / a, the corrosion rate of the pure aluminum online monitoring is 0.1223 mm / a, and the relative deviation between the online monitoring and coupon corrosion rates is 7.8%. The data are consistent, and the pure aluminum online monitoring data can well characterize the real-time corrosion state of the metal.

[0162] Table 1 Online corrosion rate and coupon corrosion rate

[0163]

[0164] In summary, the present invention has at least the following advantages or features:

[0165] (1) Research on the online monitoring technology of SCAL type intercooling circulating water system corrosion was carried out. Based on the principle of resistance corrosion measurement, the corrosion rate was measured by measuring the resistance difference caused by the thinning of the metal electrode specimen before and after corrosion. The excitation signal uses an AC signal with strong anti-interference ability and a measurement accuracy of 30nm. The measuring electrode is composed of a corrosion specimen and a compensation specimen 116. The system measures the resistance change value of the corrosion specimen relative to the compensation specimen 116 and then converts it into corrosion depth.

[0166] (2) A SCAL type intercooling circulating water system corrosion online monitoring system was constructed. Since the resistivity of aluminum is much smaller than that of steel, the thickness of the blank pipe material for making the measuring test piece 119 and the compensating test piece 116 is 1 mm. If the resistance of the test piece is too small, it will exceed the measurement limit of the probe data acquisition circuit and cannot be measured. Therefore, the resistance value of the aluminum test piece must at least reach the resistance of the steel test piece. When the thickness and width are limited, the length of the test piece can only be increased. If the aluminum measuring test piece 119 is set on the front end face of the probe like the steel sheet probe, it cannot pass through the DN40 or DN50 valve core due to the large diameter of the front end of the probe. The present invention adopts the method of setting the measuring aluminum sheet on the side of the test piece sheath 120 to ensure that the diameter of the front end of the aluminum sheet probe is the same as the diameter of the front end of the steel sheet probe.

[0167] (3) Since the melting point of aluminum is lower than that of silver welding rod, it cannot be directly connected to the four-core isolation seat 117 and the wire through silver welding like a steel test piece. If tin soldering is used, the surface of aluminum does not stick to tin and the connection cannot be achieved. The present invention first considers overlapping the wires of the four-core isolation seat 117 at both ends of the aluminum test piece, then using a copper tube to cover the overlapping part, and then using a crimping pliers to press the copper tube to achieve connection, and then filling the gap between the copper tube and the aluminum test piece and the wire to strengthen the connection. However, when the semi-finished product is manufactured, the two ends of the aluminum test piece have poor contact with the wires of the four-core isolation seat 117, resulting in incorrect measurement waveforms of the probe data collector. Later, the aluminum measurement test piece 119 was designed into an I-shape, and the aluminum compensation test piece 116 was long strip-shaped. The four legs of the I-shaped aluminum measurement test piece 119 and the two ends of the aluminum compensation test piece 116 are connected to the leads of the four-core isolation seat 117 and the high-temperature wire 113 by screw crimping. In order to prevent the large contact resistance of the screw crimping method from affecting the measurement, conductive glue is filled inside the crimping terminal to reduce the contact resistance and ensure the stability of the measurement.

[0168] (4) The engineering application of online monitoring of corrosion in SCAL intercooler circulating water system was realized. Under the test conditions of pH 6.11, dissolved oxygen 1.43 mg / L, conductivity 0.98 μS / cm, and temperature 45°C, dynamic simulation of pure aluminum corrosion coupons and online monitoring tests in SCAL intercooler system were carried out. The corrosion rate of pure aluminum coupons was 0.1134 mm / a, and the corrosion rate of pure aluminum online monitoring was 0.1223 mm / a. The relative deviation between online monitoring and coupon corrosion rate was 7.8%, and the data was consistent. The online monitoring data can well characterize the real-time corrosion status of the metal, and the measurement accuracy is high.

[0169] The various embodiments in this specification are described in a progressive manner, and the same or similar parts between the various embodiments can be referenced to each other, and each embodiment focuses on the differences from other embodiments.

[0170] The above is a description of a specific embodiment of the specification. Other embodiments are within the scope of the appended claims. In some cases, the actions or steps recorded in the claims can be performed in an order different from that in the embodiments and still achieve the desired results. In addition, the processes depicted in the drawings do not necessarily require the specific order or continuous order shown to achieve the desired results. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0171] Each embodiment in this specification is described in a progressive manner, and the same and similar parts between the embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments. In the description of this specification, the description of reference terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the embodiment of this specification. In this specification, the schematic representation of the above terms does not necessarily target the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples without contradiction.

[0172] The above is only an example of the embodiment of the present specification and is not intended to limit the embodiment of the present specification. For those skilled in the art, the embodiment of the present specification may have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the embodiment of the present specification shall be included in the scope of the claims of the embodiment of the present specification.

Claims

1. A pure aluminum corrosion monitoring probe for indirect cooling circulating water, characterized in that: include: Lead wire parts, internal packaging parts and external packaging parts; The conductor components include a high-temperature conductor, a measuring test piece, a compensating test piece, a four-core isolation seat and a six-core glass sintered aviation plug; the high-temperature conductor is connected to the measuring test piece by crimping; the high-temperature conductor is connected to the compensating test piece by crimping; the stainless steel probe in the four-core isolation seat is connected to the high-temperature conductor by welding; the six-core glass sintered aviation plug is connected to the high-temperature conductor by welding; The internal packaging component is used to support the measuring test piece, the compensating test piece and the high-temperature wire, and isolate the external corrosive medium; The external packaging component is used to package and protect the measuring test piece, the compensating test piece and the high-temperature wire.

2. The indirect cooling circulating water pure aluminum corrosion monitoring probe according to claim 1 is characterized in that: The internal packaging components include high temperature resistant glue, potting glue, four-core glass sintering, six-core glass sintering and supporting keels.

3. The indirect cooling circulating water pure aluminum corrosion monitoring probe according to claim 2 is characterized in that: The high temperature resistant glue is used to seal and wrap the measuring test piece to isolate it from external corrosive media; the potting glue is used to fill the corresponding area of ​​the compensation test piece to fix the wires and crimping terminals in the area.

4. The indirect cooling circulating water pure aluminum corrosion monitoring probe according to claim 2 is characterized in that: The four-core glass sinter is used to fix the four needles in the four-core isolation seat in the hollow position of the four-core isolation seat; the six-core glass sinter is used to fix the six needles in the six-core glass sintered aviation plug in the hollow position of the six-core glass sintered aviation plug.

5. The indirect cooling circulating water pure aluminum corrosion monitoring probe according to claim 2 is characterized in that: The supporting keel is used to support the compensation test piece and the high-temperature wire.

6. The indirect cooling circulating water pure aluminum corrosion monitoring probe according to claim 1 is characterized in that: The external packaging components include a test piece sheath, a transition tube and a probe rod; Wherein, one side of the test piece sheath is open and in contact with the external corrosive medium, and the other side is protected by stainless steel material to provide shell protection for the measuring test piece; The transition tube is used to encapsulate and protect the compensation test piece, the high-temperature wire, and the crimping terminal; The probe rod is used to package and protect the high-temperature wire.

7. The indirect cooling circulating water pure aluminum corrosion monitoring probe according to claim 1 is characterized in that: The measuring test piece is a rectangular parallelepiped structure, wherein one side of the rectangular parallelepiped is in contact with the external corrosive medium.

8. The indirect cooling circulating water pure aluminum corrosion monitoring probe according to claim 7 is characterized in that: The corrosion loss can be obtained by the change of the voltage signal after the excitation signal is applied to one side of the cuboid.

9. A method for manufacturing a pure aluminum corrosion monitoring probe for indirect cooling circulating water according to any one of claims 1 to 8, characterized in that: include: The four end pins of the measuring test piece and the two ends of the compensation test piece are connected to the leads of the four-core isolation seat and the high-temperature wire by means of screw crimping; Filling the inside of the crimping terminal with conductive glue to reduce contact resistance; wherein, before filling the conductive glue, each crimping screw cap is plastic-sealed; Weld the test piece sheath and perform waveform detection to ensure that the waveforms of the measurement test piece and the compensation test piece are normal; The compensation test piece and high temperature wire are covered with double-layer asbestos tube to isolate them from the probe shell; Weld the transition pipe and perform waveform detection to ensure that the waveforms of the measuring test piece and the compensation test piece are normal; The measuring test piece is filled with high temperature resistant sealant, and waveform detection is performed after sealing to ensure that the waveforms of the measuring test piece and the compensation test piece are normal; Weld the six-core glass sintered aviation plug at the tail and perform waveform detection after welding to ensure that the waveforms of the measurement test piece and the compensation test piece are normal.

10. A pure aluminum corrosion monitoring system for indirect cooling circulating water, characterized in that: include: Indirect cooling circulating water pure aluminum corrosion monitoring probe; wherein, the indirect cooling circulating water pure aluminum corrosion monitoring probe comprises a conductor component, an internal packaging component and an external packaging component; the conductor component comprises a high-temperature conductor, a measuring test piece, a compensating test piece, a four-core isolation seat and a six-core glass sintered aviation plug; the high-temperature conductor is connected to the measuring test piece by crimping; the high-temperature conductor is connected to the compensating test piece by crimping; the stainless steel probe in the four-core isolation seat is connected to the high-temperature conductor by welding; the six-core glass sintered aviation plug is connected to the high-temperature conductor by welding; the internal packaging component is used to support the measuring test piece, the compensating test piece and the high-temperature conductor, and isolate the external corrosive medium; the external packaging component is used to encapsulate and protect the measuring test piece, the compensating test piece and the high-temperature conductor; A data collector is used to collect corrosion signals in the intercooling circulating water system, and amplify, convert analog to digital and output the corrosion signals; A data converter receives the output signal of the data collector, converts the output signal into a communication protocol and then sends it; The corrosion measurement controller is used to send a measurement instruction to the data collector so that the data collector starts measuring after receiving the measurement instruction and uploads the measured corrosion signal after the measurement is completed; it is also used to calculate the average corrosion rate of the measurement specimen at the monitoring point based on the corrosion signal and the slope of the corrosion loss curve.

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