Two towers are used in the acid water stripping process – why is the pipeline between the upper tower and the lower tower designed in this way?
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Two towers are used in the acid water stripping process – why is the pipeline between the upper tower and the lower tower designed in this way? The upper column is a carbon dioxide stripping column, and the lower column is an ammonia stripping column; is it designed for crystallization? I hope the experts here can help explain it. Thank you.
Each case should be analyzed on a case-by-case basis; please include some parameters such as the feed rate to the tower, the amount of vapor flashing at the top of the tower, the amount of stripping steam used at the bottom of the tower, and the amount of acidic gas coming from that section. Also, specify the main components of the CO2 and acidic gases. Based on the diagram, it is preliminarily inferred that after the condensate enters the upper column, it undergoes vacuum flashing, and the stripping gas coming from the lower section is used for stripping, thereby removing most of the CO2 vapor ； The condensate enters the lower column from the left liquid seal line for thorough stripping; part of the stripping gas is sent outside, while another part enters the upper column through the right rising pipe for stripping.
It will be monitored continuously; please provide additional parameters so that everyone can learn*learn*! Thank you
The condensate entering Tower 1 is approximately 180 T/H, while the stripping steam amount is about 50 T/H. The gas produced at the top of Tower 1 amounts to roughly 5.6 T/H (54% water, 40% carbon dioxide, 1% ammonia). The operating temperature is 127°C at a pressure of 0.27 MPa. The gas produced at the top of Tower 2 is about 38 T/H (93% water, 0.7% carbon dioxide, 0.07% hydrogen sulfide), with an operating temperature of 147°C and a pressure of 0.35 MPa
Okay, thank you. I’ll add the data: The liquid flow entering Tower 1 is approximately 180 T/H, while the stripping steam flow is about 50 T/H. The gas output from the top of Tower 1 is around 5.6 T/H (54% water, 40% carbon dioxide, 1% ammonia). The operating temperature is 127°C at a pressure of 0.27 MPa. The gas output from the top of Tower 2 is approximately 38 T/H (93% water, 0.7% carbon dioxide, 0.07% hydrogen sulfide). Its operating temperature is 147°C at a pressure of 0.35 MPa. Why is the liquid phase from Tower 1 sent to the top of Tower 2 as one stream but then divided into two streams before entering Tower 2? And why is the gas phase from Tower 2 sent to Tower 1 as two streams that are combined into one stream?
Because I don’t know whether the pipe diameters of the two branch pipes are the same as that of the main pipe. If they are, I believe it is possible to choose between feeding from the top or from the bottom depending on the stripping efficiency (for example, if the stripping efficiency is poor, feeding from the top could be considered to increase the contact time for stripping)； If both branch pipes are smaller in diameter than the main pipe, it means they need to be opened simultaneously; this is likely due to the need to take into account the concentration of stripping gas at a certain tray level. You can consult the design firm or patent holder for specific details.