Flash vapor venting and pipeline modification? ?
Thread Content
To maximize the recovery of flash vapor, could we consider thickening the pipeline that leads the flash vapor to the compressor? ? If the compressor suddenly shuts down, what diameter is appropriate for the safety vent pipeline? ? ?
The thickness of the pipeline is determined based on the designed flow rate; the original poster might as well mention your designed flow rate!
We are Lind Process; the flash vapor volume is around 3000 NM3/H. The pipeline was originally 6 inches in diameter, but the design team changed it to 8 inches.
Hehe, yours are indeed big! Our model over 10,000 units is only 10 inches in size. I think it’s probably to reduce the import pressure drop! [Personal opinion]
The flash vapor fed into the compressor is specified to have a high content of H2 and CO, and a low content of CO2, at that pressure! ! ! I guess the pipeline is related to this, right~~ Hehe! ! Personal opinion
The pipe diameter is related to the flow rate, but the flow rate is in turn related to the gas composition. The design originally called for high levels of hydrogen and carbon monoxide in the flash vapor, with very low levels of carbon dioxide. However, in actual operation, if the situation is reversed, the flow rate increases, and the original pipe diameter is no longer suitable! However, the pipe diameter is usually set with a certain margin, so the problem won’t be serious! To improve the recovery of flash vapor, it is not sufficient to simply increase the diameter of the inlet pipeline of the flash vapor compressor; this also depends on the selection of the flash vapor compressor itself! We encountered such a problem: the compressor selected was too small, resulting in incomplete recovery of the flash vapor and partial venting!