Seeking advice on the production process of CO2 stripping method
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During our brief synthesis phase, the compressor did not supply gaseous material. The synthesis is in a closed state ； Due to the potential difference, will the liquid phase in the synthesis tower flow back into the stripping tower through the batch reactor? That is, after we seal the tower, the air lift tower will be filled. If it is filled. What should we pay attention to when adding materials while driving again? Please ask the experts to help answer this. Thank you. This post was last edited by lxq700918 on 2009-1-2 at 23:10.]
Why isn’t there any senior here to help answer the question? ? :'( :'( :'(
First, use CO2 headspace, then add the material.
When stopping the operation, first reduce the liquid level in the synthesis tower; once it falls below the outlet of the overflow pipe of the synthesis tower, no urine will enter the stripping tower. Furthermore, the gas phase from the stripping tower is introduced above the high-pressure ammonium methoxide condenser, preventing any liquid from flowing back. Therefore, the level of the stripper mentioned by the poster is actually the flushing water that accumulates during pipeline flushing. The OP’s worries are unnecessary; just do as I said, hehe!
Those upstairs are probably not involved in urea production, so you can’t understand what the original poster is worried about; therefore, you can’t comprehend the phenomena described by the original poster. During the shutdown of the stripping tower with it sealed, it is necessary to control the pressure of the low-pressure steam as well as the steam pressure on the shell side of the tower; meanwhile, the liquid level in the gas column should be emptied before resuming operation
For a full-liquid stripping tower, CO2 gas must be introduced first during startup. Liquid is lifted to the circulation system while being pumped and vented. Ammonium formate is added when the liquid level in the stripping tower drops to about 40%. Finally, liquid ammonia is added. If there is too much water in the system. Methylammonium can also be added last. This post was last edited by ymtuegj12 on 2009-2-3 13:30.]
1. If the stripping tower is filled with liquid during startup, CO2 gas should be introduced first; while doing so, the liquid should be vented and transferred to the circulation system. When the liquid level in the stripping tower drops to around 40%, start the methylammonium pump/ammonia pump. 2. To avoid this from happening, it is important to note the following: when shutting down the plant, after stopping the ammonia pump/methylammonium pump, reduce the liquid level in the synthesis tower to 20%, then close the outlet valve of the synthesis tower; wait about 5 minutes before stopping the carbon dioxide supply ； Secondly: During the tower sealing period, the high-pressure steam pressure should be maintained at 1.0 MPa, while the low-pressure steam pressure should be 0.55 MPa. This post was last edited by ymtuegj12 on 2009-2-3 at 13:28.]
Your case involves liquid pouring, and the order of adding materials is CO2, NH3, NH4COONH2
When parking, the liquid level in the synthesis tower must be lowered below the overflow pipe to prevent backflow. When parking, your drain valves should be completely closed; if liquid leakage occurs, it indicates that there is a leak in the control valve, so check it. When driving after pouring in the liquid, it is best to empty the stripper before introducing carbon dioxide. This kind of situation has occurred in factories where I learned * before; they always emptied the tower first before starting up.
Special attention should be paid to emptying the stripper before discharging material after starting up; otherwise, an alarm will be triggered due to the liquid temperature in the stripper exceeding the limit