[Q&A Question 262] 2017.09.20
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【Q&A Question 262】September 20, 2017: What is the significance of regularly monitoring the acidic water data from the hydrogenation unit for air cooling? (Unless otherwise specified, all Q&A questions are based on the hydrogenation unit.) ) The answers to the daily questions change, and today’s answers are shown in subsequent questions. For management purposes, if you need to view content from a few days ago, please go through the summary post below. 2017 Q&A Summary Thread (updates have begun) http://bbs.hcbbs.com/thread-1657793-1-1.html 2017 Daily Question Summary Thread (updates have begun) http://bbs.hcbbs.com/thread-1657794-1-1.html 2016 Q&A Summary Thread (updates completed) http://bbs.hcbbs.com/thread-1597792-1-1.html (Source: Haichuan Chemical Industry Forum)
Strengthen the monitoring of the quality of acidic water to prevent corrosion of air coolers
Determine the corrosion inhibitor injection amount based on acidic water data
1) Excessive impurities in acidic water can block the air cooling system. 2) If the chloride ion content in acidic water is high, it can easily cause corrosion of the air cooling system
In daily production, tests are conducted on the pH value, iron ions, and chloride ions in acidic water to identify any cases where these levels exceed the specified limits; adjustments are made to the dosage of the three types of chemicals used, and samples are added promptly to ensure that the parameters of acidic water remain within the controlled ranges, thereby preventing corrosion of the pipelines due to excessive concentrations.
In daily production, tests are conducted on the pH value, iron ions, and chloride ions in acidic water to identify any cases where these levels exceed the specified limits; adjustments are made to the dosage of the three types of chemicals used, and samples are added promptly to ensure that the parameters of acidic water remain within the controlled ranges, thereby preventing corrosion of the pipelines due to excessive concentrations.
Regularly monitor the degree of corrosion in air-cooled systems
Answer: Analysis of the acidic water samples shows that at the outlet pipe end of the air cooler, corrosion beneath the scale is primarily caused by NH4Cl and NH4HS. Regular analysis of acidic water samples helps to prevent corrosion in air coolers. For example, when the acidity level of the water increases, it is possible to raise the amount of water used for flushing in front of the air coolers, ensuring that 20% of the system remains filled with water while still meeting the requirements related to saturated vapor pressure. The frequency of water injection has been changed from once a week to continuous injection. At the same time, ensure the quality of the water used for injection as well as its uniform and stable supply.
It is mainly used to detect corrosion in the air-cooled tube bundles
By testing the acidic water, it is possible to determine the degree of corrosion of the air-cooled tube bundles. Generally, a corrosion inhibitor is added at the top of the tower; by examining the pH value of the acidic water as well as the iron ion concentration, it is possible to determine whether the amount of corrosion inhibitor used is appropriate, allowing for timely adjustments
Prevent corrosion in the air coolers.