Determine the composition and concentration of the exhaust gases released after methanol regeneration in low-temperature methanol washing
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I’m currently working on my graduation project related to desulfurization, and I’m desperately asking those who are more knowledgeable: does anyone know what the composition and concentration of the exhaust gases released after methanol regeneration in low-temperature methanol washing are?
1. When the temperature is low, make sure the temperature at the top of the tower is not too high; maintaining a lower temperature helps to allow it to rise. 2. Water separation has a low-low cascade, but no high-high cascade. 3. Pay attention to the opening degree of the liquid level tower when it is switched to automatic mode; if it gradually increases, steam should be introduced for reflux ； If it gradually gets smaller, turn off the steam backflow. If the temperature at the bottom of the tower fails to increase over an extended period, it may be due to the valves being opened too wide, resulting in excessive heat loss; in such cases, the valves should be adjusted slightly to maintain a certain flow rate. Let the temperature rise for a while; once it reaches a certain level, open the valve to release the heat. 4. The liquid level valve of the water washing tower, as well as the desalinated water and the discharge volume from the water separation tower, can be adjusted accordingly. 5. Pay attention to the steam inlet pressure. An increase in pressure indicates that steam cannot be added, and the liquid level will rise; vice versa.
Our designed values are 33% hydrogen sulfide, 53% carbon dioxide, and 11% nitrogen (on a molar basis); in actual operation, the amount of hydrogen sulfide is not that high
The exhaust gases mainly consist of CO2 and nitrogen, with nitrogen accounting for about 17%