Sulfur recovery process
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Please, experts, help solve the problems with the sulfur recovery unit! ! ! Our company’s sulfur recovery unit utilizes an ammonia-burning process. However, during a shutdown, we found that a large amount of white, hard substance accumulated after the incinerator, clogging the pipelines. Upon inspection, we determined that it wasn’t sulfur. We would like to know what this substance is How should this problem be resolved? How are these products formed?
Poor ammonia combustion will definitely accelerate the sulfation of the alumina catalyst, and ammonia salts will certainly form, blocking the equipment system
Is the blockage behind the incinerator sulfate?
Based on your description, a large amount of white, hard substance appeared to block the pipelines after the shutdown; it is not sulfur. This may be a mixture of sulfuric acid an and sulfuric acid particulates generated during the burning process. Ammonium sulfate is one of the products formed when nitrogen oxides generated after combustion react with ammonia in flue gas. To address this issue, you can consider the following points: 1. Ensure proper control of the burning process: pay attention to the burning temperature and the amount of ammonia added, avoiding excessively high burning temperatures and excessive amounts of ammonia entering the system, in order to reduce the formation of sulfuric acid an. 2. Equipment cleaning and maintenance: Regularly clean the incinerators and pipelines to remove blocked sulfuric acid an and sulfuric acid particles, ensuring smooth operation of the process. 3. Consider adding a denitration device: A denitration device can reduce the amount of nitrogen oxides generated in the incinerator, thereby reducing the production of sulfuric acid an. 4. Reduce ammonia usage: Consider using other chemicals with similar functions to replace ammonia, or optimize the amount of ammonia used in order to minimize the formation of sulfuric acid. It should be noted that the suggestions above are for reference only; please make targeted adjustments and implement them under the guidance of professionals. .
Hello! Thank you very much for taking the time to answer my questions despite your busy schedule. I have one more question: what is the typical temperature of the gas during the combustion process? (The temperature in our company’s incinerator ranges from 650–700°C.) Is this temperature considered high?
Also, how are sulfuric acid an and sulfuric acid particulates formed? Is it due to a low amount of hydrogen sulfide, incomplete combustion of ammonia, along with excessive air supply?
Hello! A furnace temperature in the range of 650–700 degrees Celsius is a commonly used operating temperature. Generally speaking, the higher the combustion temperature, the more effectively organic matter can be burned up, reducing the level of pollutants in the exhaust gases. Meanwhile, high temperatures can also promote the rapid decomposition of reaction products such as sulfuric acid an. From this perspective, a temperature of 650–700 degrees Celsius is quite suitable for the incineration process. However, excessively high burning temperatures can cause various problems, such as equipment damage and increased energy consumption. Therefore, when determining the optimal incineration temperature, a system energy balance and economic assessment are required to ensure that both pollutant emission standards are met and the normal operation of the equipment is maintained while saving energy. In summary, a temperature of 650–700 degrees Celsius is suitable during the burning process, but it also needs to be optimized and adjusted according to specific circumstances. I hope this will be helpful to you! .