A self-regulating valve would be more appropriate in that case
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In the design of the self-regulating valve, the main goal is to prevent throttling from causing the gas in the liquid to desorb and resulting in gas blockage. However, for a pressure control valve (where the medium at the tower outlet is cold gas and needs to be heated through heat exchange before further processing), ) It is placed after the heat exchanger; what is its purpose – to reduce resistance? Or something else? What is the impact of pressing it in front of the heat exchanger? I hope everyone will discuss it
To ensure effective heat exchange, it is installed after the heat exchanger. There is high pressure, the volume is small, the flow rate is relatively slow, resulting in a longer heat exchange time; thus, the heat exchange efficiency is relatively low. If it is installed before the heat exchanger, the volume increases after depressurization, the flow rate speeds up, and as a result, the heat exchange efficiency is lower. Those who have different opinions, please share them: handshake
It should be installed in front of the valve for heat exchange; if pressure-reduction flashing is used, a design that allows for heat exchange both behind and in front of the valve is also possible. Many designs of this kind developed by Snamprogett make effective use of energy.
I completely agree with the view expressed on the second floor. Generally, pressure control valves are installed after the heat exchanger in order to recover the heat or cold from the fluid, making use of the fluid at high pressure, small volume, and low flow rate before pressure reduction for effective heat exchange!
Valves such as control valves that are located after the heat exchanger are generally in areas with relatively low pressure. It’s rare to see pressure pipelines with high pressure having control valves placed after the heat exchanger. If what you’re saying is true, then pressure reduction occurs through throttling, which would further lower the temperature and facilitate the recovery of cooling capacity; however, I think this reasoning is a bit forced.
A heat exchanger does not necessarily have to rely on the amount of gas released by evaporation; a longer residence time can lead to a higher temperature. So, can a higher flow rate also improve the heat exchange efficiency? The key is still that a larger K value meets the condition for the installation location of the heat exchanger self-regulating valve mentioned on the second floor, right?
The pressure control valve behind the heat exchanger is used to regulate the mass flow rate of the gas entering the heat exchanger, thereby achieving the purpose of heat exchange.