How to handle tripping in decarbonization systems

Reply to 1# ant812: How to handle tripping in the decarburization process? It depends on the type of process used for decarburization; only by clarifying this can it be determined exactly what actions should be taken. I will use the decarburization process with phenylphthalein solution as an example to explain it briefly as follows: 1. If the lean liquid pump fails, vent some gas in front of the absorption tower, increase the circulation rate of the semi-lean liquid, and have the central control system reduce production capacity. At the same time, inform the shift leader and the control room to promptly contact and start the backup pump, or have the relevant personnel fix the equipment malfunction before restarting it to resume normal production. 2. If it is a semi-poor liquid pump that shuts down: the gas is vented in the front part of the absorption tower. At the same time, overall production is reduced to lower load, the circulation volume of the lean liquid is increased, and its temperature is raised. Notify the shift leader and the control room to promptly contact and start the backup pump, or have the relevant personnel fix the equipment malfunction before restarting it in order to restore normal operation of the system. 3. If both the lean liquid pump and the semi-lean liquid pump fail: close the gas outlet valve of the absorption tower as well as the main valve for the fresh gas at the methanation outlet; open the bypass line of the intermediate converter, close the main valve for that line, and thereby disconnect the methanation process ； Vent before or after starting the tower to stabilize the pressure in the upstream system; reduce the conversion load via central control, and promptly contact to start the backup pump. Once the outlet alkaline washing meets the requirements, restart the methanation unit and resume production. Under normal circumstances, if the plant is operating at full capacity and the lean liquid pump or semi-lean liquid pump fails due to lightning strikes or other reasons, it is recommended to shut down the methanation process; the methanation unit can be restarted once the pump is operational again ； Due to untimely load reduction when the pump fails, or untimely venting or insufficient venting volume before starting up the tower, it can lead to a significant excess of alkali in the solution, severe overheating in the methanation process, and even minor excesses in methane levels that can cause carbon-ammonia crystal buildup in the synthesis unit. The approach of shutting down the methanation process provides a higher degree of safety, but the downside is that it interrupts the operation flow; however, recovery is quick. On the other hand, if overheating causes equipment damage or carbon-ammonia crystal buildup in the synthesis unit, recovery becomes much more difficult.

You need to write clearly what exactly failed Should the process conditions also be clearly stated?