Ask about circulating water corrosion issues
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Refining units in recent years have catered to* * Water conservation and emission reduction work has increased the amount of sewage reuse and saved some water resources. However, this measure has caused a large number of corrosion leaks in coolers that use circulating water. During the maintenance of my factory in March, it was discovered that a large number of circulating water cooler tube bundles were corroded, and new tube bundles had to be replaced. In total, the new tube bundles cost more than 1 million yuan. It is analyzed that the cause of corrosion is corrosion under scale. The new pipe bundle uses carbon steel and pipe scale anti-corrosion. I want to upgrade the material to stainless steel, but I am worried about the chloride ion pitting corrosion of stainless steel. Is there any better measure to prevent and control corrosion in circulating water?
1. Is it possible to change the pre-filming method or solvent? 2. Anti-corrosion inside and outside the tube. 3. Choose the appropriate stainless steel material.
The returned water has not been treated. It is best to add medicine to solve the water quality problem.
It is best to find a company with industrial circulating water analysis and testing capabilities to conduct a follow-up sampling analysis of your circulating water system to determine the water quality type, and determine process control conditions such as concentration multiples and dosing types for you based on the water quality. Then choose and configure scale and corrosion inhibitors, bactericides, etc. that are suitable for your use. 4 to 9 indicators of the circulating water need to be tested daily. After installing new heat exchange equipment, it is best to perform a pre-membrane cleaning before driving.
Choosing appropriate raw materials is one aspect, but solving water quality problems first is fundamental. Recycling and reusing sewage is a measure to save energy and reduce consumption, but from the overall economic benefit point of view, it must be used rationally, and if it cannot be applied, it is not worth the gain.
Regular testing and dosing of circulating water to ensure the quality of circulating water.
Test every day and add medicine according to the test report to prevent corrosion.
It is a trend to use recycled sewage water for circulating water replenishment water, but the reused sewage must meet the indicators of circulating water replenishment water. Secondly, clean the pre-membrane before the start of the device. Thirdly, cooperate with the chemical manufacturer to find the suitable chemical for your plant's circulating water!
When the quality of circulating water cannot be completely solved, it is best to anti-corrosion treatment of the pipe bundle, and at the same time, the flow rate of circulating water can be increased. If stainless steel is used, the chloride ion content must be checked regularly.
http://bbs.hcbbs.com/thread-395272-1-2.html Research and Countermeasures on the Corrosion of Stainless Steel Heat Exchangers by Circulating Cooling Water
Three points of medicine, seven points of management. It is necessary to do a good job in chemical selection and standardized management of circulating water.