Flash evaporation issue (carbon dioxide stripping)
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We added instrument air to the vapor line of our flash tank, and a control valve was installed on this vapor line, located before the control valve. Dear sea friends, I wonder what purpose this serves? When to use it? I wonder if devices of the same type among you have this pipeline.
Original poster, in what you mentioned about \"a control valve being added to the gas-phase pipeline\", does the gas-phase pipeline refer to the \"gas-phase outlet pipeline of the flash tank\" or the \"instrument air pipeline\"? If it is the “vapor outlet line of the flash tank,” it is likely used to break the vacuum in case of system abnormalities. However, we don’t have this pipeline here; only the first and second stages of evaporation are available.
First of all, thank you! It refers to the fact that a control valve is installed on the flash vapor line, and an instrument line is added to the pipeline between the control valve and the flash tank.
Is what the poster is referring to the vacuum in the broken flash tank? We also experience vacuum breaks during the first and second steaming stages. This post was last edited by lxq700918 on 2009-2-15 11:10.]
Is the poster creating a new installation? I’ve never seen this design before. Was the intention behind such a design to use instrument air in combination with control valves in order to regulate the pressure in the flash tank, thereby controlling the amount of flashing and the concentration in the urine feed tank? To control Bi at low load? It’s a bit forced. This post was last edited by lxq700918 on 2009-2-15 11:10.]
There should be a condenser for the vapor exiting the flash tank; is there an atmospheric pressure absorption system connected after the condenser? ? The control valve should regulate the flash pressure, which is beneficial for consumption control. Also, the original poster’s description isn’t very clear; a simple process diagram can be uploaded for analysis
Of course, the flashed vapor phase passes through a surface cooler first, before going to the atmospheric pressure absorption tower. Finally, the flare stack. This post was last edited by lxq700918 on 2009-2-15 14:11.]
The moderator and the person on floor 5 have given very detailed answers; there’s nothing more to add: lol. By the way, I need charisma points:$
This pipeline was not part of the original design; it has been added now, and I believe its main function is to break the vacuum in the flash tank. This post was last edited by lxq700918 on 2009-2-15 14:12.]
Personally, I don’t think it’s necessary to add instrument air. Adding instrument air to the gas phase simply breaks the flash vacuum, and this can be controlled using the flash cold return water valve and the flash gas phase valve. Our factory’s old urea system has this feature, but instead of using instrument air, it is connected directly to the atmosphere; however, no one uses it. It doesn’t feel convenient without water. Adding non-condensable gases to the flash vessel reduces the heat exchange area in one section. It’s merely my personal opinion