Is it better to vent the naphtha tank vapor or to recover it?
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Dear masters, please help me. I proposed using gas interconnection for the 7 5,000-cubic-meter naphtha tanks in our facility, in order to reduce vapor losses from these tanks and minimize the amount of nitrogen that needs to be added. After all, these tanks are constantly having material flow in and out of them, so this approach seemed like a way to save costs. However, our management decided to use compressors to recover that gas instead. Well, although it is possible to recover the volatile light components in the tank, it also increases the amount of nitrogen that needs to be added. Could everyone help me think about which approach would be better?
It depends on your plant’s naphtha inventory and transfer volume; check what the relevant losses and compressor recovery rates are. Let’s do the financial calculations again to see how long it will take to recoup the costs. A short recycling cost cycle is something worth supporting, as it is beneficial to the environment!
It’s definitely unreasonable, because using a compressor is not economical and also poses safety issues. If there’s a chance, adding an internal floating roof would be fine. It can save approximately 85% of the volatilization amount
Gas recovery technology is not yet very mature in China; it is costly and difficult to maintain. Relatively speaking, it is better to change it to an internal floating roof tank
We already have internal floating roof tanks; a few years ago, modifications were carried out to seal all the vents around the tank bodies, and a nitrogen sealing control system was added in order to reduce gas evaporation. Nevertheless, some naphtha vapor still escapes through the breather valves and gaps in other tank top accessories. Additionally, we need to inject large amounts of nitrogen on a daily basis, as we have feed tanks as well as continuous discharge tanks. The feed tanks release large quantities of nitrogen and naphtha vapor during the feeding process, while the discharge tanks require substantial amounts of nitrogen to maintain a slight positive pressure in the nitrogen sealing control system. Therefore, I was thinking whether it would be possible to connect the gas phases of various tanks together, so that the gases from different tanks could complement each other, thereby saving and reducing the loss of nitrogen as well as the volatile light components of naphtha.
It’s better to add a gas collection tank after connecting it :)
Could you explain it more clearly? What is the purpose of adding a gas collection tank? Because the safe feeding height for each of our tanks is 13. 5 meters, and the side height of the tank is 17. 8 meters, plus the top of the tank cone – the gas space in all those tanks combined is also over 10,000 cubic meters.
Have you implemented this method of connection? How effective is it? varied and
Gas connectivity can certainly reduce the total amount of nitrogen used as well as gas emissions, supporting the original poster’s idea. Oil and gas recovery technology is an environmental protection measure; one should not consider only economic factors. The recovery efficiency is not ideal, and in some cases, the systems installed are merely for show.