Seeking help with pipeline selection
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How should the logistics option be selected for the following set? I’ve been worried for several days now; I’m asking for help from everyone. Thank you. The diameter I chose is too large; I don’t know how to make improvements or what flow rate to set How to solve this problem. Molecular formula, Molecular weight g/mol, Boiling point °C, Density g/cm3: 0, 40, 50, 60, 7. Mass flow rate kg/h, Mass fraction, Mass flow rate kg/h, Mass fraction, Mass flow rate kg/h, Mass fraction, Mass flow rate kg/h, Mass fraction. Total mass flow rate kg/hr: 102261.309102261.309317587.694317587.694. Total volume flow rate cum/hr: 59169.36771519.32880841.15867451.708. Temperature °C: 46.7210210134.1. Pressure bar: 16, 20, 20. Vapor phase fraction: 1110.992. Components: Carbon monoxide CO: 28.0104-191.450.0012500000000; Nitric oxide NO: 30.00614-151.7710.0012700000000; Nitrogen N2: 28.01348-195.8060.0012500000000; Hydrogen H2: 2.01588-252.760.0000969209.4650.67769209.4650.67765793.0140.20765793.0140.207. Methanol CH4O3: 2.0421664.70.791832963.110.32232963.110.322223083.4340.702223083.4340.702. Water H2O: 18.0152810018.87908.8790162.5980.001162.5980.001. Nitrogen dioxide NO2: 46.00554210.0020500000000. Dimethyl oxalate C4H6O4: -190.0788490.251.147913.674013.67401837.9970.0061837.9970.006. Dimethyl carbonate C3H6O3-D3: 331.9988-182.9621.06922.295022.2950146.5380146.5380. Oxygen O2: 61.04036-18.3460.0014300000000. Methyl formate CH3NO2-N: 1118.08924163.450.99100000000. Ethylene glycol C2H6O2: 62.06844197.31.115515.067015.067025940.4760.08225940.4760.082. 1,2-Butanediol C4H10O2-D6: 90.1222196.4210.06300.0630146.6730146.6730. Ethanol C2H6O: -246.0690478.290.7928.195028.1950282.3360.001282.3360.001. Methyl glycolate C3H6O3-D4: 90.078841511.170.56200.5620194.6280.001194.6280.001
Using the first logistics option, I’ve made a rough estimate: the flow rate is assumed to be 15 m/s, and the pipe diameter should be DN1100… which is large enough. What diameter did the original poster choose? There are standards for selecting the flow rate; the original poster should look them up. I need to be busy for a while, so I’ll calculate it carefully for you later.
Thank you for the help; I really lack knowledge in this area and didn’t know how to make a selection. Thanks to the original poster for sharing this. I’ve done a rough estimate – it’s probably a little over 3 meters.
Was the volume converted to m3/s during the calculation? The unit of flow rate is m/s; therefore, the volume flow rate is divided by 3600, giving V/(3600*0.785*u), and the entire expression is then taken to the power of one half. 1.6 MPa. I haven’t looked up a standard value for the gas flow rate; I’m assuming it’s around 10–20 m/s. I’ll try calculating with a few different values – it probably can’t be over 3 meters per second.
Due to the process requirements regarding hydrogen, such a hydrogen reflux stream is necessary; the volume of this reflux hydrogen stream is 80,000 cubic meters per hour. It consists of hydrogen and methanol, but the flow velocity of both hydrogen and methanol must not exceed 8 m/s. How should such a pipe be selected? According to the data provided, V/(3600*0.785*u) yields a pipe diameter of 1.88 meters, which is too large. Is it possible to connect the pipes in parallel, or what other options are there for selecting the appropriate size? Thank you.
Could the original poster explain why \"the flow rates of hydrogen and methanol cannot exceed 8 m/s\"? Is there any standard for this? Is it still in the process package stage or the basic design stage? Your unit must have a recirculation compressor; how is the flow rate inside it controlled? What about the flow velocity inside the valve bore? The outlet size of the compressor is also a reference.