Low-temperature high-pressure pump!
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As the title says! We are currently facing a problem with selecting the pump during the design process! The environment is as follows: liquid nitrogen is stored in a tank at 3 Mpa in front of the pump, while a ultra-high pressure shell-and-tube heat exchanger is located behind the pump at 100 Mpa ； Since the medium is liquid nitrogen, the pressure before and after initialization is balanced. As the pump starts to feed liquid nitrogen into the heat exchanger, the heat exchanger also begins to operate (sealing the outlet of the heat exchanger’s tube side), and the heat exchanger system continues to evaporate and boil, thereby increasing the pressure! During the process, the pressure in the tube side of the heat exchanger rose to 100 Mpa! Therefore, the pump must be capable of withstanding the extremely high pressure at the outlet, while still continuing to supply liquid nitrogen! The ultimate operating temperature is -195.9°C! Please ask Haiyoumen to recommend pumps suitable for this application condition!
I’m not quite familiar with the manufacturer’s techniques. If it’s a pure high-pressure pump, I would recommend learning about the technology behind direct-drive water jet pumps, which can achieve pressures of 420 MPa; however, their flow rate is usually low, around 5 L/min
It’s mainly the difference in pressure before and after the pump!
Personally, I think the original poster didn’t describe things clearly: 1. The medium used by the pump is liquid nitrogen, with an inlet pressure of 3 MPa and a temperature of -196 degrees Celsius; there’s no problem with that； 2. The process of the heat exchanger is not very clear; does the liquid nitrogen entering the heat exchanger from the pump outlet go into the tube side or the shell side of the heat exchanger? Based on your description, it should be liquid nitrogen flowing in the tube side to exchange heat with hot water for vaporization ； 3. This is also related to the arrangement of your equipment; in other words, the relative position of the two devices determines the head pressure ； 4. There is an issue here, namely the rate of heat transfer and the vaporization time; only by knowing these can the flow rate required by the pump be calculated ； 5. There are many mature products available in the cryopump market; well-known brands include JC Carter, Ebara, Nikkiso, etc.
It’s also difficult to estimate the pressure at the inlets of JC Carter, Ebara, and Nikkiso; I think you could try using a reciprocating pump instead
If a plunger pump (reciprocating pump) is used, a high flow rate cannot be achieved； If a centrifugal pump is used, the pump inlet seal is a major issue.
It’s a process of liquid nitrogen vaporization; so what do you do with the liquid nitrogen after it has vaporized? Not going into the compressor? ? So how can liquid nitrogen be reused?
After energy conversion. Pressure energy is converted into kinetic energy – mechanical energy ； Energy consumption generates condensation.
I don’t understand this process you’re talking about
A plunger pump will do; our high-pressure nitrogen system uses a plunger pump, with a maximum pressure of 16.5 MPa