There is a return line at the outlet of the feed pump of the desorption tower connected to the ammonia water tank.
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This post was last edited by Haichuan Zhifeng on 2010-6-1 17:01. There is a 25mm return line at the outlet of the feed pump of the desorption tower connected to the ammonia water tank. What is it doing? ?
This post was last edited by weilingli on 2010-5-31 17:12 I have seen someone else explain that the feed pump of the hydrolysis tower also has a reflux stream to the first analysis tower. It is probably the same reason, because the pump is a multi-stage centrifugal pump, and it seems to be to protect the pump. In the CO2 urea unit, part of the liquid from the hydrolysis tower feed pump flows back to the first desorption tower. Why? This pump is a multi-stage centrifugal pump (seven stages). There are two pipelines at the pump outlet. One pipeline is sent to the hydrolysis tower, and the other pipeline is sent back to the analysis tower. The inlet of the replenishing pump is adjusted by a regulating valve, forming a double-loop liquid level adjustment. The liquid level regulating valve on the pipeline sent to the hydrolysis tower displays the inlet liquid level of the pump, which can realize the adjustment of the inlet liquid level and the pump outlet flow rate. The other regulating valve displays the pump outlet flow rate, and can also realize the above adjustment. The main purpose of this setting is to ensure that the inlet liquid level of the pump is sufficient to prevent the inlet liquid level from being evacuated. For example, when the load of the hydrolysis system is low, this valve needs to be opened to replenish the liquid level to ensure that the suction material of the centrifugal pump is sufficient and the operation of the pump is safe.
What is the diameter of the pipe? Analysis: There is a flow rate to control the liquid level of the feed. It should be good to maintain the possibility of backflow. If the pipe diameter is small, it may be a liquid seal.
Reply 3# ythwangbo It doesn’t feel like a liquid seal. The ammonia tank has its own liquid seal device.
Most pumps used in chemical plants are equipped with a 1-inch small return pipeline, and some even add a flow limiting plate to protect the pump and avoid stuffing the pump. Special pumps are also marked: the return valve must be opened and must not be closed.