How to treat hydrocarbons in sulfur recovery acidic gas streams
Thread Content
I’m seeking advice from experts: what should be done to deal with hydrocarbons present in the acidic gases from sulfur recovery units, and what methods can be used? What steps should be taken if carbon deposition has occurred on the catalysts? Thank you{:1_90:}
In such cases, it is necessary to first limit the processing capacity of the small feed device and increase the air supply in order to ensure that the hydrocarbons in the feed are burned completely. At the same time, it is important to ensure an adequate supply of water for the boiler, so as to prevent the activation of the low liquid level interlock mechanism in the boiler! At the same time, ensure proper coordination with the upstream units, appropriately reduce the amount of acidic water stripped, and control the presence of hydrocarbons in the feed! In fact, as operators, it is essential to understand the relationships between various parameters, so as to be able to make early judgments, take preventive measures, reduce fluctuations, and avoid accidents With timely judgment and proper handling, the probability of catalyst carbon buildup will **decrease**, and subsequent operations will also be much simpler! However, if a large amount of hydrocarbons are present and the air supply cannot keep up, carbon deposition is almost inevitable; this will significantly reduce the efficiency of the Claus low-temperature reaction bed, thereby increasing the difficulties associated with the high-temperature Claus reactions that take place earlier in the process!
For hydrocarbons in acidic gas streams, it is first necessary to increase the air supply in order to ensure that the hydrocarbons are completely burned. The treatment measures should start with the upstream units: improving oil separation, raising the flash temperature, and reducing pressure. To remove carbon deposition from the catalyst surface, coking is generally used to restore the catalyst’s activity. However, since coking takes place at high temperatures, it is difficult to carry out, and it can easily damage the structure of the catalyst particles, leading to their fragmentation and a decrease in activity. Therefore, replacing the catalyst is usually the method employed to improve its activity
Release an appropriate amount of steam to prevent carbon deposition, but this only provides temporary relief; it is necessary to contact the upstream party to adjust the operating conditions. Additionally, to deal with carbon buildup, the temperature of the bed layer can be increased slightly