In the context of a new era of rapid social development, the petrochemical industry has also ushered in a new development opportunity, not only in the level of production technology, to achieve a significant improvement, and chemical production quality, efficiency have been improved, is a very important part of the current economic system. However, in the actual petrochemical production, the equipment often corrodes due to various reasons, which affects the operation of the equipment, and thus leads to a significant reduction in the quality and efficiency of chemical production. Therefore, in order to better carry out petrochemical production, it is necessary to formulate corresponding anti-corrosion countermeasures on the basis of accurate analysis of the causes of equipment corrosion, and ensure production efficiency and improve equipment safety through more scientific and reasonable anti-corrosion technologies and methods.

 

Significance of corrosion protection of petrochemical equipment

 

1.1 Ensure the normal operation of the device

 

In the actual petrochemical production, the problem of equipment corrosion has always been one of the important problems plaguing the production of enterprises, because the problem of corrosion prevention is very common, and the treatment work is relatively complex, resulting in few enterprises can carry out efficient corrosion treatment. In addition, the corrosion problem needs to occur under certain conditions, once it occurs, it may affect the operation of the equipment, and affect the smooth development of other surrounding work, so that the life of the equipment is shortened. Through effective anti-corrosion treatment, it can guide enterprises to clarify the correct anti-corrosion work concept and method to a certain extent, and guide enterprises to carry out anti-corrosion work scientifically and reasonably. This can not only ensure the effectiveness of the anti-corrosion work, but also ensure the continuous and normal operation of the equipment, which has a very positive role in protecting the economic benefits of the enterprise.

 

1.2 Effective implementation of production safety

 

In the process of using petrochemical equipment to produce chemical products, if some positions of chemical equipment are corroded, it will directly affect the quality of the product, and at the same time, gas and liquid leakage caused by corrosion will affect the safety of relevant personnel involved in production, which is very unfavorable to the implementation of safety production goals.

 

In addition, corrosion will also cause the leakage of petroleum raw materials, which will cause very serious explosion accidents in the event of open fire, seriously affecting the production of chemical products, as well as the safety of personnel and enterprises. Through effective anti-corrosion work, these problems can be fundamentally avoided, effectively solve the corrosion of equipment, and ensure that the entire production process can be smooth and safe. This can not only provide support for more efficient production work, but also provide basic protection for people's health and life safety to a certain extent.

 

1.3 Efficient environmental protection

 

After the corrosion problem occurs, it will not only directly affect the production efficiency of the enterprise, resulting in the reduction of the economic efficiency of the enterprise, but also cause the enterprise to bear relatively large environmental pollution responsibility to a certain extent. This is mainly because after the corrosion problem occurs, it will lead to the leakage of semi-finished products and raw materials in the equipment, and the harmful gases or liquids leaked will flow into the nature through the soil and drainage system, thus affecting the surrounding ecological environment.

 

And to do a good job of equipment corrosion prevention is a means to avoid pollution of the environment from the source, to fundamentally avoid the leakage of gas or liquid, to ensure that waste gas and waste liquid can be discharged after environmental protection treatment. This can not only avoid serious waste of resources, but also achieve efficient protection of the surrounding ecological environment.

 

Common corrosion causes of petrochemical equipment

 

2.1 Device Problems

 

In the actual production and processing stage of chemical products, there are many types of equipment used in production and processing, mainly reaction equipment, heat exchange equipment, heating equipment, storage equipment, instrumentation equipment, etc., which are largely composed of various metals. The metal in the air for a long time exposure, there will be oxidation reaction with various substances in the air resulting in corrosion, coupled with the chemical equipment structure is very complex, resulting in a very complex and easy to change the anti-corrosion oxidation process.

 

At the same time, if there are active metals in chemical equipment, there will be an electrochemical reaction after contact with the electrolyte, causing the problem of electrochemical corrosion. This type of corrosion is very difficult to prevent, once it appears, it will directly have a serious impact on the metal parts, not only the parts will be damaged, but also may be due to material leakage, resulting in electrical equipment short circuit, temperature can not be controlled and other problems, if serious may cause explosion accidents.

 

2.2 Chemical Reaction

 

In the daily actual production process of petrochemical enterprises, it is necessary to use equipment to deal with a variety of media, and more chemical reactions will occur in this process. The more common chemical reactions that can cause corrosion problems are mainly the following: First, the acid-base medium is a medium that is more common and easy to cause corrosion problems in equipment, and can react with metal equipment.

 

Second, the production generally needs to add a variety of materials or reagents, some materials will produce a certain reaction, some media will also release more heat or high temperature gas in the chemical reaction process, which can produce oxidation reaction between the equipment, causing the equipment to be corroded.

 

Third, the production environment is also an important factor in corrosion equipment, mainly because most of the production of petrochemical products in the workshop, there will be a variety of metal particles, chemical solutions with different pH, corrosive gases, etc., if the equipment is in this environment for a long time, it will be subjected to certain corrosion.

 

Fourth, during the production process, some of the solutions do not react with the equipment at the beginning of production, and after the temperature rises to a certain extent, some solutions will REDOX reactions with the metal equipment, causing the internal surface of the equipment to be corroded. Fifth, in the production, there are also different types of chemical corrosion in the region, such as production equipment in the coastal zone, which will be eroded by chloride ions for a long time.

 

2.3 Physical Corrosion

 

In the traditional petrochemical production process, gas-liquid flow will also cause certain corrosion of chemical equipment, and under normal circumstances, this problem is caused by improper operation, such as in actual operation, operators do not pay attention to the preservation and protection of equipment, resulting in the production process of gas-liquid flow too fast, resulting in equipment or pipeline erosion corrosion. In general, the higher the flow rate, the greater the surface area of the material in contact, and the faster the corrosion rate of the material will be.

 

Therefore, if we do not pay attention to the actual bearing capacity of the equipment, the flow speed of gas and liquid in the equipment is too fast, it will cause the metal equipment to be gradually corroded. In addition, some employees do not establish the correct production safety awareness, and do not pay attention to the maintenance and maintenance of the equipment, it will lead to the deepening of the degree of corrosion of the equipment, which may cause the equipment to be irredeemable. It brings great economic losses to enterprises.

 

Anti-corrosion countermeasures of petrochemical equipment

 

3.1 Isolation of corrosive media

 

In the actual process of carrying out anti-corrosion work, in addition to using the corresponding method to repair and treatment, it is a very important idea to fundamentally solve the corrosion problem, and it is also the best anti-corrosion path. Because the device is easily corroded by media, it is necessary to effectively isolate the corrosive media from the device by controlling the concentration of chemical media. By improving the environment of the equipment, better anti-corrosion effect can be ensured.

 

First of all, for petrochemical equipment, it is necessary to stay away from the seawater and other corrosive media as far as possible, such as by setting a corrosion layer on the surface of the equipment, the equipment itself is isolated from the seawater, so as to avoid the equipment from being corroded by seawater for a long time, resulting in the quality of the equipment being affected.

 

Second, the medium concentration can be properly controlled, through dilution and other means, on the basis of ensuring the normal operation of the enterprise, reduce the occurrence of long-term corrosion of high-concentration medium equipment.

 

At the same time, because most of the equipment or pipelines involved in the production of petrochemical enterprises will be affected by the corrosive medium, and the medium concentration and temperature will often change, therefore, in the selection of anti-corrosion measures, it is necessary to make a reasonable choice according to the actual situation. For example, for some media that are affected by temperature and will be corroded by temperature rise, in the case that the medium cannot be controlled, it is necessary to focus on the isolation measures of the equipment itself, such as coating isolation layers.

 

3.2 Scientific selection of equipment

 

At present, China's research on anti-corrosion of petrochemical equipment is progressing rapidly. On the basis of traditional commonly used equipment materials, many new anti-corrosion materials with relatively high quality properties have been actively developed, and have begun to be applied in the production and manufacturing of chemical equipment. It mainly uses a variety of anti-corrosion materials to make the lining of the equipment or to add a covering layer on the equipment, completely isolating the metal equipment and the medium, avoiding serious corrosion of the equipment, thereby improving the corrosion resistance and wear resistance of the equipment, and effectively extending the service life of the equipment.

 

There are some differences between the anti-corrosion coatings used in chemical plants and conventional coatings, the technical content is relatively high, the scientific and technological components of acid and alkali resistance are relatively high, and a lot of new technologies and new research and development results are involved.

 

Therefore, in the actual selection of production equipment, in order to better provide support for the orderly production of chemical products, the current need to pay great attention to the selection of equipment in the actual production, not only need to choose equipment with good corrosion resistance and high durability, but also need to consider the application of various new materials, especially the application of environmental protection anti-corrosion materials. In order to ensure that on the basis of extending the service life of the equipment, environmental protection equipment can be applied in actual production, providing support for environmental protection and green energy saving.

 

In addition, the production of anti-corrosion coatings used in chemical plant equipment needs to rely on physics, ecology, instruments, machinery and other multidisciplinary knowledge, and the technology is mainly from the synthesis of high-resistance resin, rheological additives, the application of high-efficiency dispersants, and the development of new anti-corrosion and impermeable pigments and fillers.

 

From this perspective, the development of chemical plant anti-corrosion equipment material technology can also ensure the effect of anti-corrosion to a certain extent. Therefore, as the main user of the equipment, it is necessary to pay attention to the emergence and application of new anti-corrosion materials, and actively purchase new equipment according to the actual situation to provide support for doing anti-corrosion work and promoting the continuous improvement of the anti-corrosion level of chemical equipment.

 

3.3 Strengthen technical management

 

For a variety of factors that cause corrosion of chemical equipment, the most simple and direct way is to apply anti-corrosion coatings on the external or internal surface of the equipment, or to use corrosion inhibitors, and to strengthen the management of anti-corrosion technology. This can achieve a better anti-corrosion effect in the shortest time, and compared with the purchase of new equipment, this method is also relatively low cost.

 

In the process of actual use of chemical equipment, in order to ensure the overall production quality and level of products, it is necessary to strictly control the specific application of each link of chemical equipment. Because the chemical production of the enterprise itself has a lot of safety risks, the corrosion problem of production equipment seems to be a relatively small problem, but if not given a high degree of attention, it may lead to more serious safety accidents.

 

Therefore, in actual production, it is necessary to ensure that the concept of safe production is carried out throughout the entire production process, and the production operation is managed through a strict management system, and the equipment cleaning and maintenance are strictly carried out to ensure that problems can be found and dealt with in time. At the same time, it is necessary to do a good job in the maintenance of equipment, in the enterprise to form a professional equipment inspection and maintenance department, so that it is specially responsible for regularly checking the corrosion of equipment, and according to the actual situation of the equipment, targeted measures to solve the problem. Ensure that more professional anti-corrosion technology can be processed to support the safe operation of the equipment.

 

For example, in the actual process of carrying out maintenance work, the anti-corrosion plan of one removal and four injection can be implemented in practice, that is, through desalination, water injection, alkali, ammonia, and corrosion inhibitors, the anti-corrosion ability of the equipment is improved, and the problem of equipment corrosion is effectively alleviated. The method has been applied by foreign enterprises since the 19th century, and it has been improved continuously in the practical application process in recent years, and has obtained good application results. In specific operations, problems related to the corrosion of the condensation cooling system can be effectively alleviated through the application of chloride salts; Through deep desalting, the concentration of corrosive medium can be effectively reduced to achieve better anti-corrosion effect.

 

In addition, it is also necessary to conduct regular inspections of the technical level and professional ability of the personnel, timely guide the relevant equipment maintenance personnel, timely participate in a variety of new anti-corrosion technology training, master and understand more anti-corrosion methods, and apply them in actual work. By strengthening all aspects, the implementation of efficient technical management work, to provide technical support for the safer operation of equipment.

 

peroration

 

Petrochemical equipment is a very important part of chemical enterprises, its quality and efficiency can directly affect the benefits of enterprises.

 

In view of the current serious corrosion problem, in order to better implement the anti-corrosion work, it is necessary to accurately implement the anti-corrosion work in practice by isolating the corrosive medium, rationally selecting the equipment, doing a good job in technical management and other measures on the basis of clearly identifying the main causes of equipment corrosion. Avoid chemical material leakage caused by environmental pollution, bring safety risks to production and other problems, ensure production safety on the basis of providing certain support for enterprises to maximize benefits.

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