循环水运行对换热器腐蚀性研究及对策

Study on Corrosion of Heat Exchanger by Circulating Water Operation and Countermeasures

热交换器是一种将一部分热量从热液体传递到冷液体,然后再传递到热液体的装置,也称为循环热交换器。管式换热器由于技术先进,维护方便,其广泛用于各个行业。由于热交换器在生活的各个领域中越来越普遍,因此其维护能力正在逐年增加,尤其是由于各种物理和化学热交换器会导致各种形式的故障,换热器会因此损坏。根据研究,百分之九十的热交换器损是由于腐蚀的原因,一般的热交换器由金属材料制备而成,其一般的热换器都是在高温或者高压条件下运行,并与冷,热,酸,碱,气体,液体和物质直接接触并混合。其他用于热交换的流体,这使得腐蚀的现象变得更加的严重。本课题主要研究换热器产生腐蚀的因素、机理、方法,接着对腐蚀后的物质,对其进行取样、分析。进一步研究换热器的原理,给出应对腐蚀的措施,总结出换热器腐蚀的具体解决方案。本文总结出一种Ni-P腐蚀涂层方法,三层复合涂层,阳极保护和有机化学喷涂来控制热交换器的腐蚀。

Heat exchanger is a device that transfers part of heat from hot fluid to cold fluid and then to hot fluid, also known as the circulating heat exchanger. Tubular heat exchangers are widely used in various industries due to their advanced technology and easy maintenance performance. As heat exchangers become more prevalent in all areas of life, their maintenance capabilities are increasing year by year, especially because of different physical and chemical heat exchange factors, which can lead to different forms of heat exchanger damage. According to the report, 90% of the damage to the heat exchanger was caused by corrosion. Heat exchangers are usually made of metal materials, and most work under high temperature and pressure conditions, and are in direct contact with cold, hot, acid, alkali, gas, liquid and substance directly contact and mix. Other fluids used for heat exchange, which makes the corrosion problem very serious. This topic mainly studies the corrosion reasons, mechanisms and methods of heat exchangers, and then samples and analyzes the corroded substances. Further study the principles of heat exchangers, give measures to deal with corrosion, and summarize specific solutions for heat exchanger corrosion. This paper summarizes a Ni-P corrosion coating method, three-layer composite coating, protective anode and injection of organic chemicals are proposed to control the corrosion of heat exchangers.