WO2021143170A1 - 一种小口径换热管阴极保护电位测量装置及使用方法 - Google Patents

一种小口径换热管阴极保护电位测量装置及使用方法 Download PDF

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WO2021143170A1
WO2021143170A1 PCT/CN2020/115405 CN2020115405W WO2021143170A1 WO 2021143170 A1 WO2021143170 A1 WO 2021143170A1 CN 2020115405 W CN2020115405 W CN 2020115405W WO 2021143170 A1 WO2021143170 A1 WO 2021143170A1
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heat exchange
potential
exchange tube
tube
small
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PCT/CN2020/115405
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English (en)
French (fr)
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刘锋
曹杰玉
刘永兵
朱涛
姚建涛
文慧峰
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西安热工研究院有限公司
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    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
    • C23F13/00—Inhibiting corrosion of metals by anodic or cathodic protection
    • C23F13/02—Inhibiting corrosion of metals by anodic or cathodic protection cathodic; Selection of conditions, parameters or procedures for cathodic protection, e.g. of electrical conditions
    • C23F13/06—Constructional parts, or assemblies of cathodic-protection apparatus
    • C23F13/08—Electrodes specially adapted for inhibiting corrosion by cathodic protection; Manufacture thereof; Conducting electric current thereto
    • C23F13/22—Monitoring arrangements therefor
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
    • C23F2213/00—Aspects of inhibiting corrosion of metals by anodic or cathodic protection
    • C23F2213/30—Anodic or cathodic protection specially adapted for a specific object
    • C23F2213/32—Pipes

Definitions

  • the invention belongs to the technical field of cathodic protection measurement, and in particular relates to a small-diameter heat exchange tube cathodic protection potential measuring device and a use method.
  • Cathodic protection is a common anti-corrosion method for equipment in service in seawater environment.
  • the heat exchange and cooling equipment of coastal thermal power plants and ships generally use copper alloys and titanium as heat exchange tube materials.
  • cathodic protection is often used to protect the equipment.
  • the length of the heat exchange tube protected by cathodic protection is relatively small, which is less than 12 times the diameter of the heat exchange tube.
  • the cathodic reaction on the surface of the heat exchange tube is faster, and the protection range of the length of the heat exchange tube by cathodic protection is smaller, which is less than 12 times the diameter of the heat exchange tube.
  • the cathodic oxygen absorption reaction on the surface of the heat exchange tube decreases, and the cathodic protection range of the heat exchange tube by cathodic protection, that is, the length of the heat exchange tube, will far exceed 12 Times the diameter of the heat exchange tube.
  • the true cathodic protection range needs to be determined through experimental research. How to design a measuring device to meet the sealing and insulation requirements, and finally realize the measurement of the cathodic protection potential of the heat transfer tube, there are certain technical difficulties.
  • the purpose of the present invention is to provide a small-diameter heat exchange tube cathodic protection potential measuring device and a method of use.
  • the measuring device is reliable and easy to implement, and solves the problem of the cathodic protection potential of small-diameter pipelines. The problem of measurement.
  • a device for measuring cathodic protection potential of small-caliber heat exchange tubes comprising a heat exchange tube 1 with an opening on the outer wall, a sealing rubber gasket 2 and a pressure block 3 placed on the upper end of the opening of the heat exchange tube, and a metal pipe hoop with holes processed in advance 4 Press the sealing rubber gasket 2 and the pressure block 3 tightly, and the potential test probe 5 passes through the metal pipe hoop 4, the pressure block 3, the sealing rubber gasket 2 and the small holes reserved for the heat exchange tube 1 in turn, and extends into the heat exchange tube.
  • the potential test probe 5 is connected with the pressure block 3 through a thread to achieve a seal between the two, and the compression nut 6 compresses the potential test probe 5 and the inlet of the needle valve 7 and realizes the gap between the two
  • the lower end of the drainage tube 8 is connected with the outlet part of the needle valve 7 and compressed by the compression nut 6.
  • One end of the silicone rubber guide tube 9 is directly sleeved on the drainage tube 8, and the other end of the guide tube 9 Put into the electrode cup 10, the reference electrode 11 is also put into the electrode cup 10; the heat exchange tube 1 and the reference electrode 11 are connected to the potential tester 13 through the wire 12. The installation of the device is completed.
  • the needle valve 7 is slightly opened so that the working medium in the heat exchange tube 1 sequentially passes through the potential test probe 5, the needle valve 7, and drainage
  • the tube 8 and the guide tube 9 slowly flow into the electrode cup 10.
  • the potential tester 13 is turned on to measure the cathodic protection potential at the opening position of the heat exchange tube 1.
  • the materials of the potential test probe 5, the needle valve 7, and the drainage tube 8 that are in contact with the working fluid in the heat exchange tube 1 are all polytetrafluoroethylene, the sealing rubber gasket 2 and the diversion tube 9 are silicone rubber, and the electrode cup 11 is not Conductive commercially available plastic measuring cup, the material of the pressing block 3 is PTFE.
  • the present invention has the following advantages:
  • the device is simple to make, easy to install, and easy to implement.
  • the part in contact with the working fluid in the device is made of organic insulating material, which ensures the accuracy of the test results and reliable sealing.
  • Figure 1 is a schematic diagram of the structure of the measuring device of the present invention.
  • a device for measuring the cathodic protection potential of a small-caliber heat exchange tube and its use method First, make a small hole on the outer wall of the heat exchange tube 1; The briquette 3 made of vinyl fluoride is placed on the upper part of the small hole of the heat exchange tube 1, and the metal pipe hoop 4 with small holes is untied and passed through the gap of the heat exchange tube 1, and the heat exchange tube 1, the sealing rubber gasket 2 Press the pressure block 3 tightly.
  • the small holes of the heat exchange tube 1, the sealing rubber gasket 2, the pressure block 3 and the metal pipe clamp 4 need to be aligned; use the pressure nut 6 to connect the potential test probe 5 with the PTFE
  • the needle valve 7 made of vinyl material is pressed tightly; the potential test probe 5 wrapped with PTFE tape is inserted into the small hole of the metal pipe hoop 4, and the thread on the outer wall of the potential test probe 5 is screwed into it.
  • the needle valve 7 is slightly opened to make the working fluid in the heat exchange tube pass through the potential test probe 5, the needle valve 7, the drainage tube 8 and the diversion in turn
  • the tube 9 slowly flows into the electrode cup 10, and after the test end of the reference electrode 11 is immersed in the working fluid, the potential tester 13 is turned on to measure the cathodic protection potential at the opening position of the heat exchange tube 1.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Testing Resistance To Weather, Investigating Materials By Mechanical Methods (AREA)
  • Prevention Of Electric Corrosion (AREA)

Abstract

一种小口径换热管阴极保护电位测量装置及使用方法，该装置包括外壁开孔的换热管（1）；金属管箍（4）将置于换热管（1）开孔部位上端的密封胶垫（2）和压块（3）压紧；电位测试探头（5）依次穿过金属管箍（4）、压块（3）、密封胶垫（2）和换热管（1）加工预留的小孔，伸入到换热管（1）内；电位测试探头（5）上端与针型阀（7）入口连接；引流管（8）下端与针型阀（7）出口连接；导流管（9）一端直接套在引流管（8）上，另一端放入到电极杯（10）中；参比电极（11）也放入到电极杯（10）中；换热管（1）与参比电极（11）通过导线（12）与电位测试仪（13）进行连接。测试过程中，当换热管（1）内工质形成流动条件后，微开针型阀（7），使管内工质缓慢流入到电极杯（10）中，打开电位测试仪（13），记录电位测试数据。该测量装置可靠且易于实现，解决了小口径管道阴极保护电位测量的问题。

Description

一种小口径换热管阴极保护电位测量装置及使用方法 技术领域
本发明属于阴极保护测量技术领域，具体涉及一种小口径换热管阴极保护电位测量装置及使用方法。
背景技术
阴极保护是海水环境中服役设备的常用防腐方法。沿海火力发电厂和船舶的换热冷却设备普遍采用铜合金、钛作为换热管材料。为了控制换热管、管板及换热器壳体的腐蚀，常采用阴极保护对设备进行保护。阴极保护设计中，一般认为阴极保护对换热管的长度保护范围较小，小于12倍换热管直径。然而，阴极保护的范围遵循欧姆定律，电压降△U＝RI，其中R为海水电阻，电流I则受电化学腐蚀的阴极反应速度控制。当换热管内海水处于高速流动条件下，换热管表面发生的阴极反应速度较快，阴极保护对换热管的长度保护范围较小，小于12倍换热管直径。但是当管内海水处于静止状态，随着管内海水溶解氧浓度的降低，换热管表面的阴极吸氧反应降低，阴极保护对换热管的阴极保护范围即换热管的长度将远远超过12倍换热管直径。真实的阴极保护范围需要通过试验研究确定，如何设计测量装置，满足密封、绝缘要求，最终实现对传热管的阴极保护电位的测量，存在一定技术难点。
发明内容
为了解决上述现有技术存在的问题，本发明的目的在于提供一种小口径换热管阴极保护电位测量装置及使用方法，该测量装置可靠且 易于实现，解决了解决了小口径管道阴极保护电位测量的问题。
为达到上述目的，本发明采用如下技术方案：
一种小口径换热管阴极保护电位测量装置，包括外壁开孔的换热管1，置于换热管开孔部位上端的密封胶垫2和压块3，预先加工有孔的金属管箍4将密封胶垫2和压块3压紧，电位测试探头5依次穿过金属管箍4、压块3、密封胶垫2和换热管1加工预留的小孔，伸入到换热管1内，电位测试探头5通过螺纹与压块3进行连接并实现两者之间的密封，压紧螺母6将电位测试探头5与针型阀7入口部位进行压紧并实现二者之间的连接与密封，引流管8下端与针型阀7出口部位进行连接并利用压紧螺母6压紧，硅橡胶材质的导流管9一端直接套在引流管8上，导流管9另一端放入到电极杯10中，参比电极11也放入到电极杯10中；换热管1与参比电极11通过导线12与电位测试仪13进行连接。装置安装完成，测试过程中，当换热管1内工质形成正压条件后，微开针型阀7，使换热管1内工质依次通过电位测试探头5、针型阀7、引流管8上和导流管9缓慢流入到电极杯10中，参比电极11测试端浸没到工质中后，打开电位测试仪13，对换热管1开孔位置的阴极保护电位进行测量。
与换热管1内工质接触的电位测试探头5、针型阀7、引流管8的材质均为聚四氟乙烯，密封胶垫2和导流管9为硅橡胶，电极杯11为不导电的市售塑料量杯，压块3的材质为聚四氟乙烯。
本发明和现有技术相比较，具有如下优点：
1)装置制作简单，安装方便，易于实现。
2)装置中与工质接触的部分为有机绝缘材料，保证了测试结果的准确性且密封可靠。
附图说明
图1为本发明测量装置结构示意图。
具体实施方式
下面结合附图和具体实施例对本发明做进一步说明。
如图1所示，一种小口径换热管阴极保护电位测量装置及使用方法，首先，将换热管1外壁开一个尺寸合适的小孔；将硅橡胶材质的密封胶垫2和聚四氟乙烯材质的压块3置于换热管1小孔上部，预先加工有小孔的金属管箍4解开后从换热管1间隙穿过，并将换热管1、密封胶垫2和压块3压紧，换热管1、密封胶垫2、压块3和金属管箍4等四个部件的小孔需要对正；利用压紧螺母6将电位测试探头5与聚四氟乙烯材质的针型阀7入口部位进行压紧；将缠有聚四氟乙烯生料带的电位测试探头5插入到金属管箍4小孔中，并利用电位测试探头5外壁的螺纹旋入到压块3的小孔中，使电位测试探头5依次穿过密封脚垫2和换热管1，并伸入到换热管1内；将聚四氟乙烯材质的引流管8下端与针型阀7出口部位进行连接并利用压紧螺母6压紧；将硅橡胶材质的导流管9一端直接套在引流管8上；导流管9另一端放入到电极杯10中，参比电极11也放入到电极杯10中；换热管1与参比电极11通过导线12与电位测试仪13进行连接。装置安装完成，当换热管1内工质形成正压条件后，微开针型阀7，使换热管内工质依次通过电位测试探头5、针型阀7、引流管8上和导流管 9缓慢流入到电极杯10中，参比电极11测试端浸没到工质中后，打开电位测试仪13，对换热管1开孔位置的阴极保护电位进行测量。

Claims (4)

  1. 一种小口径换热管阴极保护电位测量装置，包括外壁开孔的换热管(1)，置于换热管开孔部位上端的密封胶垫(2)和压块(3)，将密封胶垫(2)和压块(3)压紧的金属管箍(4)，电位测试探头(5)依次穿过金属管箍(4)、压块(3)、密封胶垫(2)和换热管(1)加工预留的小孔，伸入到换热管(1)内，电位测试探头(5)通过螺纹与压块(3)进行连接并实现两者之间的密封，电位测试探头(5)与针型阀(7)入口部位利用压紧螺母(6)压紧并实现二者之间的连接与密封，引流管(8)下端与针型阀(7)出口部位进行连接并利用压紧螺母(6)压紧，硅橡胶材质的导流管(9)一端直接套在引流管(8)上，导流管(9)另一端放入到电极杯(10)中，参比电极(11)也放入到电极杯(10)中；换热管(1)与参比电极(11)通过导线(12)与电位测试仪(13)进行连接。
  2. 根据权利要求1所述的一种小口径换热管阴极保护电位测量装置，其特征在于：与换热管(1)内工质接触的电位测试探头(5)、针型阀(7)、引流管(8)的材质均为聚四氟乙烯。
  3. 根据权利要求1所述的一种小口径换热管阴极保护电位测量装置，其特征在于：所述密封胶垫(2)和导流管(9)为硅橡胶，电极杯(11)为不导电的塑料量杯，压块(3)的材质为聚四氟乙烯。
  4. 权利要求1所述的一种小口径换热管阴极保护电位测量装置的使用方法，其特征在于：测试过程中，当换热管(1)内工质形成正压条件后，微开针型阀(7)，使换热管(1)内工质依次通过电位 测试探头(5)、针型阀(7)、引流管(8)上和导流管(9)流入到电极杯(10)中，参比电极(11)测试端浸没到工质中后，打开电位测试仪(13)，对换热管(1)开孔位置的阴极保护电位进行测量。
PCT/CN2020/115405 2020-01-16 2020-09-15 一种小口径换热管阴极保护电位测量装置及使用方法 WO2021143170A1 (zh)

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