【Corrosion Technology Edition】Daily Question 20170821: What is process corrosion protection in oil refining plants?
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To boost the popularity of the Mechanical Equipment Corrosion Technology section, enhance communication among users, and enable everyone to learn together, progress together, and improve together, the 【Question of the Day】 activity has been launched. Reward rules: 3 wealth points for replying, 10 wealth points for correct answers. This topic is valid for two days; no scoring will be given after that. Short answer: What is process corrosion protection in oil refining plants? It mainly refers to the technical measures that aim to address equipment and pipeline corrosion in the low-temperature light oil sections of the distillation systems in units such as atmospheric and vacuum distillation units (the tops of the initial distillation tower, atmospheric tower, and vacuum tower), as well as in units for catalytic cracking, coking, reforming, hydrorefining, and hydrocracking. These measures involve the use of chemicals such as electrodialysis salts, water, neutralizing agents, and corrosion inhibitors, along with specific process operating conditions. =================================== 【Mechanical Area】Recruitment for moderators and technicians – applications and referrals are welcome.【Valid indefinitely】If you’re interested, come ahead! http://bbs.hcbbs.com/thread-1568748-1-1.html
Currently, the corrosion protection in refinery processes is affected by external factors such as manual operations and changes in crude oil properties, as well as by the tendency of online sensors to become damaged. Based on single-neuron PID intelligent control, the proportional coefficient is modified. The results of Matlab simulations show that this modified algorithm improves the responsiveness of the automatic anti-corrosion control system for industrial processes. This problem is addressed through three approaches: online control, online and offline judgment, and offline control, thereby solving the issue of being unable to continue automatic control when the online detector provides inaccurate readings. Theoretical derivations were carried out to determine the range values for sulfur and acid numbers in crude oil; by combining these with other range specifications, all relevant grades for the control conditions were established, providing a basis for automatic control in offline testing. To address the high requirements for reliability and security in control systems, redundant design and other design approaches are employed, **which enhances the security of database management, the reliability of hardware, and the accuracy of data.**
Process corrosion prevention refers to the methods of altering process operating conditions, or using chemical agents such as neutralizers and corrosion inhibitors to slow down equipment corrosion
It refers to the process control measures aimed at addressing corrosion of equipment and pipelines containing low-temperature light oils in the systems of atmospheric and vacuum distillation units – specifically the tops of the initial distillation column, atmospheric tower, and vacuum tower – as well as in the distillation systems of units such as catalytic cracking, coking, reforming, hydrofining, and hydrocracking. These measures primarily involve electrodialysis, injection of neutralizing agents, injection of corrosion inhibitors, and water injection.
It mainly refers to solutions for the \"three tops\" systems of atmospheric and vacuum distillation units (the top of the initial distillation tower, the top of the atmospheric distillation tower, and the top of the vacuum distillation tower), as well as catalytic cracking, coking, and reforming
“\"Process anti-corrosion\" refers primarily to the process control measures taken to address corrosion of equipment and pipelines in the low-temperature light oil sections of the systems in atmospheric and vacuum distillation units – namely the tops of the initial distillation tower, atmospheric tower, and vacuum tower – as well as in the fractionation systems of units such as catalytic cracking, coking, reforming, hydrofining, and hydrocracking. These measures include electrodialysis, injection of neutralizing agents, injection of corrosion inhibitors, and water injection.
It mainly refers to the technical measures that aim to address equipment and pipeline corrosion in the low-temperature light oil sections of the distillation systems in units such as atmospheric and vacuum distillation units (the tops of the initial distillation tower, atmospheric tower, and vacuum tower), as well as in units for catalytic cracking, coking, reforming, hydrorefining, and hydrocracking. These measures involve the use of chemicals such as electrodialysis salts, water, neutralizing agents, and corrosion inhibitors, along with specific process operating conditions.
Corrosive chemical processes.
It mainly refers to the technical measures that involve the use of chemicals such as electrodialysis salts, water injection, neutralizing agents, and corrosion inhibitors, along with specific process conditions, to address corrosion issues in the equipment and pipelines related to low-temperature light oils within the fractionation systems of units like atmospheric and vacuum distillation units (i.e., the tops of the initial distillation tower, atmospheric tower, and vacuum tower), as well as units for catalytic cracking, coking, reforming, hydrorefining, and hydrocracking.
Process corrosion prevention refers to methods of slowing down equipment corrosion by altering process operating conditions, or by using chemical agents such as neutralizers and corrosion inhibitors. Corrosion of refinery equipment is most evident in the atmospheric and vacuum distillation tower top condensation and cooling systems in areas dealing with high-temperature heavy oil and low-temperature light oil. The main reason is the salt content in crude oil. The inorganic salts contained in crude oil are mainly NaCl, MgCl_2, and CaCl_2. During the processing of crude oil, MgCl_2 and CaCl_2 are hydrolyzed by hot water to form HCl. During the distillation process, HCl volatilizes along with the light components in the crude oil as well as water, and then condenses. Therefore, corrosion mainly occurs in the gas and liquid phases of the light oil flow area, being particularly severe at the phase transition zone between gas and liquid, namely the so-called \"dew point\" area. In atmospheric distillation units, corrosion mainly occurs in the trays at the top of the tower and the overhead condenser.
It refers to the process-based anti-corrosion measures (hereinafter referred to as “process anti-corrosion measures”), which mainly involve methods such as electrodesalination, injection of neutralizing agents, water injection, and injection of corrosion inhibitors, and are taken to address corrosion of equipment and pipelines in the low-temperature light oil sections of the distillation systems in units such as atmospheric and vacuum distillation units (including the tops of the initial distillation tower, atmospheric tower, and vacuum tower), as well as in the distillation systems of units like catalytic cracking, coking, reforming, hydrofining, and hydrocracking. The above measures are the main methods for preventing corrosion in the low-temperature areas of refining production units.