Control of the amine solution inlet line in the exhaust gas absorption tower
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The amine solution inlet lines of the exhaust gas absorption tower are usually divided into 2; what should be the appropriate size of the valves? I made some appropriate adjustments; using both inlets results in slightly lower SO2 emissions compared to using only the lower inlet
The purpose of the two inlets is to ensure that the sulfur dioxide content in the flue gas remains within acceptable levels; by using only the lower inlet, carbon dioxide absorption can be reduced, thereby increasing the concentration of hydrogen sulfide in the regenerated acidic gas and raising the temperature of the sulfur production furnace.
The CO2 measurement has not been done yet, but when the system is operating at near full capacity, trying to increase the inlet volume can indeed help reduce SO2 emissions. I wonder if such a practice is possible? I’d like to hear the advice from the experts.
There are usually three trays between these two inlets; increasing the feed at the top improves the absorption effect, which is quite easy to understand. What does the original poster mean? I don’t quite understand
Regarding the issue we just tried to address—the modification of the amine solution inlet point in the absorption tower—our plant has set up three feed points in the absorption tower, namely at positions 13#, 15#, and 18#. Previously, the feed was directed to position 15#. For the purpose of experimentation, we changed the feed point to 18#. After this change, there was indeed a slight decrease in SO2 levels, by about 15 mg/m³ (from 270 mg/m³ down to around 255 mg/m³). However, this change led to another problem: the liquid level in the separator tank at the top of the absorption tower rose. In other words, there is a possibility that liquid might be carried along with the acid gas at the uppermost feed point. Based on the above experiments, it is not feasible to significantly improve the SO2 levels in the exhaust gas by altering the feed operation of the absorption tower. The poster can try reducing the temperature of the circulating amine solution; our experiments show that lowering this temperature can effectively improve the absorption of H2S. Similarly, reducing the temperature of the exhaust gases also helps, as a lower exhaust gas temperature enables MDEA to absorb H2S more effectively. For reference only
How did you make the improvements to the feed port? Was it done online? 、
Thank you. I haven’t done this before; the main purpose of sending this is to see what the effects will be, and whether it’s possible to keep that import setting active. I know now, thank you! ! !