Recerca Anticorrosiu Recobriments per Elèctric Calefacció Canonada Calor Intercanviadors i Calor Intercanviadors

Recerca i Discussió on Especial Anticorrosiu Recobriments per Elèctric Calefacció Canonada Calor Intercanviadors i Calor Intercanviadors

A calor intercanviador és a dispositiu allò transferències part de la calor de a calent fluid a a fred fluid,

Also known as a heat exchanger. Heat exchangers are common equipment in chemical, petroleum, power, food, and many other industrial sectors, occupying an important position in production. In chemical production, heat exchangers can be used more widely as heaters, coolers, condensers, evaporators, and reboilers. There are many types of heat exchangers, but according to the principles and methods of heat exchange between cold and hot streams, they can be divided into three major categories: inter wall type, hybrid type, and regenerative type. According to long-term on-site construction experience of Beijing Zhisheng Weihua Chemical Engineers, heat exchangers are mostly used in high-temperature and corrosive (high or low pH) environments, with severe structural corrosion. The utilization rate of heat exchange equipment directly affects the efficiency and cost of oil refining processes. According to statistics, heat exchangers account for about 1/5 of the investment in chemical engineering construction. Therefore, the utilization ratio and lifetime of heat exchangers are important issues worth studying. From the perspective of the causes of damage to heat exchangers, corrosion is a very important cause, and corrosion of heat exchangers is a widespread phenomenon. To solve the corrosion problem effectively is equivalent to solving the root cause of damage to heat exchangers.

The corrosion of heat exchangers mainly refers to the corrosion of plates. Uniform corrosion and localized corrosion are two major types of corrosion on stainless steel plates of plate heat exchangers. Impurities, salts, gases, and microorganisms in the medium of the heat exchanger can cause corrosion to the tubesheet and welds. Research has shown that industrial water, whether fresh or seawater, contains various ions and dissolved oxygen, among which the concentration changes of chloride ions and oxygen play an important role in the corrosion shape of metals. In addition, the complexity of the metal structure can also affect the corrosion morphology. Corrosion that is concentrated on individual small points on the metal surface and has a greater depth is called pitting corrosion, or small hole corrosion or pitting corrosion. Severe crevice corrosion can occur in gaps and covered areas of the metal surface. Therefore, the corrosion of the weld between the tube plate and the tube array is mainly pitting corrosion and crevice corrosion. From the outside, there will be many corrosion products and sediment on the surface of the tube plate, with bubbles of varying sizes distributed. When seawater is used as the medium, galvanic corrosion can also occur. Bimetal corrosion is also a common phenomenon of tube plate corrosion. The anti-corrosion coating research engineer of Beijing Zhisheng Weihua Chemical Co., Ltd. has summarized the corrosion types of heat exchanger for a long time. Common local corrosion types include crevice corrosion, stress corrosion, and wear corrosion. "The destruction of a metal by the chemical or electrochemical action of the surrounding medium, often in conjunction with physical, mechanical, or biological factors, that is, by the action of the environment in which it resides.".

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