Can the heat-exchanged solution directly enter the inlet of the pump?
Thread Content
Due to site constraints, our company has a set of plate heat exchangers put into use. Due to the process location and other reasons, the solution after heat exchange does not enter the buffer tank, but directly enters the inlet of the pump for outward transportation. It will be ready to be put into use in a few days. (The other solution after heat exchange has a buffer tank.) What should be paid attention to in such a process? Does it have a big impact on the operation of the pump?
Generally speaking, the impact should not be very big. The main problem is that we should find ways to control the flow rate of the solution and try to maintain a stable value. Otherwise, the pump will be in an abnormal production state intermittently and the life of the pump will be shortened.* * When shortening the use, the valve at the pump outlet should be opened at a smaller opening. After weighing the pros and cons, I suggest you find a way to install a small buffer tank.
Generally speaking, a buffer tank should be installed. Of course, if the solution temperature is not high, it does not need to be installed. It is best not to use the method of reducing flow to control. Although this can reduce cavitation, it is neither economical nor safe. It should be used only as a last resort. :handshake:victory:
If you really don't need a buffer tank, can you consider installing a liquid level gauge in the heat exchanger to control its liquid level and prevent the pump from emptying out?
This is not certain, as long as there is a buffer in front of the heat exchanger, it is okay! However, it is still necessary to ensure that there is sufficient cavitation margin and that no gasification occurs after heat exchange! This requires very high liquid purity, so it is best to have it, safety first! !
This design brings certain problems to safety and equipment maintenance. There should be a solution through discussion.
It does not need to be added. There are many examples of heat exchangers entering the pump directly, but there should be a container in front of the heat exchanger that can maintain the liquid level. Moreover, the liquid level produced by this container should be higher than the heat exchanger, and there should be no "π" shape in the middle, otherwise it will easily collect gas and cause cavitation.
It doesn’t need to be added. There are many examples where the heat exchanger is directly fed into the pump. The liquid level of the heat exchanger should be higher than the pump inlet, and there should be no bag in the middle, otherwise gas will easily collect and cause cavitation!
Pay attention to the pump not to cause cavitation. Also, pay attention to the temperature when selecting the pump. A filter should be installed in front of the pump to prevent debris, bubbles, etc. from affecting the pump.
It is not surprising that the heat exchanger goes directly into the pump. But you have to consider a few questions 1: Is the heat exchange medium of the heat exchanger stable and will it be affected by other factors? 2: How to ensure the safe flow of your pump when you can't see the liquid level. 3: Design drop mechanics problems on pipelines. 4: Depend on what type of pump you have, lift, and current. Is it okay to idle for a short period of time? 5: Finally, a safety plan must be written for the heat exchanger to be directly fed into the pump.