Temperature of lean solution in the MDEA decarbonization process
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In the MDEA decarburization process, what is the maximum allowable temperature of natural gas entering the absorption tower? Does excessively high temperature have any effect on decarburization? What is the appropriate temperature difference for the MDEA lean solution entering the absorber? What impact does it have on absorption when the inlet air temperature is 50 degrees, the temperature of the lean liquid in the absorption tower is also 50 degrees, and there is no temperature difference? Please experts discuss and share their insights. Thank you!
In the MDEA decarburization process, the temperature of natural gas entering the absorption tower should generally not exceed 40 degrees Celsius. If the temperature is too high, it will reduce the absorption efficiency of MDEA for carbon dioxide. Ideally, the temperature difference of the MDEA lean stream entering the absorption tower should be maintained between 5 and 10 degrees Celsius. If the inlet gas temperature is 50 degrees and the temperature of the lean liquid in the absorption tower is also 50 degrees, the lack of temperature difference may reduce the absorption efficiency, as a temperature difference helps to enhance the mass transfer process between the gas and the liquid. .
Low temperatures are beneficial for absorption; high pressure is also beneficial for absorption. However, this isn’t an absolute rule. It’s quite unusual – I’ve never seen this happen before. Welcome to visit and provide your guidance: https://bbs.hcbbs.com/thread-5669064-1-1.html (Source: Haichuan Chemical Forum)
A lower temperature is beneficial for absorption
The temperature of the natural gas fed into the MDEA decarbonization process must take into account both absorption and regeneration, as well as the thermal balance of the entire decarbonization process; therefore, it isn’t true that the lower the temperature of the incoming natural gas, the better!
Does MDEA not decompose or denature at high temperatures?
The temperature of the lean liquid in the MDEA decarburization process should be about 4–7°C higher than the inlet temperature of the feed gas. The MDEA decarburization process is a common gas purification method, in which the temperature control of the lean solution is one of the key factors. In the MDEA decarburization process, the lean liquid refers to the MDEA solution that is reused for absorption after regeneration. The temperature of this solution needs to be kept within a certain range to ensure its effective absorption of carbon dioxide from the feed gas. The temperature of the lean liquid should be about 4–7°C higher than the inlet temperature of the feed gas; such a temperature difference helps improve absorption efficiency and ensures effective removal of carbon dioxide. In addition, the MDEA decarboxylation process also involves the control of other key parameters, such as feed temperature, the number of absorption tower trays, and regeneration temperature. For example, the feed temperature should be set between 40°C and 45°C, the optimal number of theoretical plates is 20 to 25, and the optimal regeneration temperature is 95°C to 100°C. The control of these parameters is crucial for ensuring the efficiency and effectiveness of the MDEA decarboxylation process. In summary, the control of the temperature of the lean solution in the MDEA decarboxylation process is one of the key factors in ensuring effective decarboxylation. By adjusting the difference between the temperature of the lean solution and the temperature of the feed gas, the absorption efficiency of the MDEA solution can be optimized, thereby improving the efficiency and effectiveness of the entire decarboxylation process.