Summary of corrosion and protection in sulfur recovery units
Thread Content
Here is a brief overview of the corrosion and protection measures for sulfur recovery units: The main types of corrosion that occur in sulfur recovery units are H2S-H2O corrosion, dew point corrosion, H2O-H2S-NH2-CO2 corrosion, and high-temperature sulfidation corrosion. H2S-H2O corrosion mainly occurs in the acid gas preheater and the flue gas quench tower ； Dew point corrosion causes severe damage to components such as sulfur condensers, collectors, and sampling sections of exhaust incinerators ； H2O-H2S-NH2-CO2 corrosion can cause severe damage to components of the exhaust gas treatment system, such as the absorption tower, regeneration tower, and MDEA rich/lean liquid heat exchangers ； High-temperature corrosion mainly occurs in the combustion chambers of burners and flue gas incinerators, hydrogenation reactors, and at the top of flares. In terms of the degree of damage, H2S-H2O corrosion, dew point corrosion, and H2O-H2S-NH2-CO2 corrosion cause much greater damage to equipment compared to high-temperature sulfidation corrosion; these types of corrosion often lead to corrosion cracking of the equipment, resulting in serious accidents. For the first three types of corrosion, effective preventive measures can only be taken at the source, by using high-quality corrosion-resistant materials ； To reduce the damage caused by high-temperature sulfidation corrosion, it is sufficient to maintain the steady operation of the device (which prevents large fluctuations in the combustion chamber temperature that could damage the heat-resistant lining), as well as to regularly repair the refractory layer.
Thank you for sharing; it would be great if it could be more specific
The summary is good, but it seems a bit general! Can LZ send some materials to share in the sub-channels? :lol
In fact, sulfur corrosion is mainly attributed to dew point control. Therefore, the importance of insulation is self-evident; however, the calculation for insulation must take into account a margin, as pitting corrosion can easily occur on the pipe walls during the control process
This post was last edited by Shandong Huaxing on 2010-7-17 02:02. However, the materials used for the equipment and pipelines in this section are quite ordinary. For acidic gas pipelines, both those from methanol washing and those from shift reaction use carbon steel. The liquid separation buffer tank is also made of carbon steel. Alloy steel was started to be used only after the acid gas combustion furnace. The material of the valve is 304.
This post was last edited by Shandong Huaxing on 2010-7-17 02:02. Now, the pipes that are used have all been replaced with stainless steel ones; carbon steel pipes are no longer used. Active participation
This post was last edited by Shandong Huaxing on 2010-8-4 at 12:49. Could everyone please explain in more detail which sections of that pipeline are made of stainless steel and which ones are made of carbon steel? :hug:
The last edit to this post was made by Shandong Huaxing on 2010-8-9 at 23:55. The corrosion in sulfur plants can basically be divided into two types: 1. Dew point corrosion (occurs when water vapor is present and the temperature is low enough for water dew point to form. At this time, acidic substances such as hydrogen sulfide and sulfur dioxide enter the water droplets, forming liquid-phase acidic substances that adhere to them)2. High-temperature sulfur corrosion (corrosion caused by substances such as sulfur and thiol at temperatures above 240°; sulfur corrosion is most severe at 300°)