Overheating problem of the working fluid in liquid jet pumps
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Our company’s liquid jet pumps have been experiencing overheating of the working fluid, which forces us to frequently change the water in the pumps. What I would like to ask is whether it’s possible to connect a water tank to the pump in order to continuously circulate the water inside the pump, thereby avoiding the need to change the water. If this can be done, are there any things to keep in mind?
Add a heat exchanger to the circulating water pipeline!
Our pump tank is equipped with coils for cooling, but the effect isn’t very good; the temperature difference between the inlet and outlet water isn’t significant； So now I want to make improvements.
It is normal for the working fluid to heat up during prolonged operation; excessive heating is caused by incomplete cooling earlier on. It is necessary to replace some of the working fluid regularly. Thorough cooling in advance is the fundamental solution.
The cooling coil has such a small heat exchange area; a shell-and-tube heat exchanger must be used! Unless your motor has a power of 3–5 kW or less, there are no condensable gases in the intake air! ! What is the motor power? What are the condensable components in the intake air, and what is their amount?
Tube or plate heat exchanger!
The motor has a power of 15 kW, and the gas that does not condense in the condenser is likely an amine substance. The main source of heat is the heat generated by the pump’s operation.
The front-end condenser works well; the vacuum-pumping tubes also feel at room temperature. The main source of heat generation is the operation of the pump and the friction caused by the liquid.
It’s saturated gas being pumped, so there is definitely latent heat of condensation, in addition to the power of the 15kW pump. A shell-and-tube condenser of at least 3–4 square meters is necessary!
Okay, thank you for helping me solve this problem.
You’re welcome! Typical liquid ejectors are mainly used to draw process gases containing large amounts of condensable gases. If the amount of non-condensable gases in the process gas is high, a water ring pump or a dry pump is required. When a liquid ring pump is used in a closed-loop system, not much wastewater is generated, and it requires almost no maintenance ； Dry pumps are indeed green and energy-efficient, but they require more maintenance. The efficiency of liquid ejectors in removing non-condensable gases is too low.