In the VPSA oxygen production process, why are the blowers divided into two circuits?
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This post was last edited by you*n*nyou on 2011-9-1 20:46. Dear colleagues in the air separation industry, I’m new to this field and there’s something I don’t understand; I hope my colleagues can help me out and share their knowledge with me. In the VPSA oxygen production process, why are there two paths for the blower: one leading to the adsorption tower and the other for exhaust?
This is related to the adsorption process; you can understand it by looking at the step-by-step diagram. When the pressure is increased or leveled, the blower does not need to operate, so evacuation is carried out at this time to reduce energy consumption.
Thank you, dear sea friend. I’m not very familiar with VPSA oxygen production; could you explain it in more detail? The process of VPSA oxygen production and such
Why isn’t anyone answering? I’ll answer instead
VPSA process flow: Air passes through a filter and enters the blower, where it then enters from the bottom of the adsorption tower under the action of the blower. The lower part of the adsorption tower is filled with activated alumina, which serves to remove water molecules and carbon dioxide molecules from the air, thereby preventing the zeolite molecular sieve from being \"poisoned\". The upper part of the adsorption tower consists of zeolite molecular sieves; as air flows through this bed filled with molecular sieves, the nitrogen molecules in the air diffuse into the solid molecular sieves due to adsorption forces, while oxygen molecules and argon atoms pass through the bed and into the buffer tank. The buffer tank is connected to the oxygen compressor, which compresses the product to the pressure required by the user and sends it to the gas storage tank for use in production. After a period of adsorption, the molecular sieve particles become filled with nitrogen molecules, reaching the adsorption saturation stage. At this point, the air inlet valve is closed, and the oxygen-rich air inside the tower is used to flush the other tower that has just been evacuated. Once the pressure drops to a certain level, the pressure equalization valve is closed, while the vacuum pump inlet valve is opened to evacuate the tower. After achieving a certain degree of vacuum, the oxygen-rich air from the other tower together with some of the product gas in the buffer tank is used to flush the zeolite molecular sieves, thereby enabling complete desorption of the adsorbent. After the desorption process of the adsorbent is completed, the tower is pressurized with product gas; once a certain low vacuum level is reached, the buffer valve is closed and the blower outlet is opened. I’m not sure if it helps, but I saw it on the company’s website.
Thank you, fellow sea traveler! Thank you so much! 5# *ao315_2
I’m not sure whether you are using a two-tower process or a three-tower process. The exhaust valve of the blower is used during startup; once the blower and vacuum pump have started, the PLC controlling the adsorption tower is activated according to a preset timing, and the exhaust valve is gradually closed in order to adjust the oxygen level and vacuum degree of the product.
Why is there only one path after the blower on our company’s flowchart??? Ugh. . . . , I’ve learned it*, ==Hah, go and study it
Is there a big difference between the two-tower process and the three-tower process? We use a two-tower process: first, we start the blower and the vacuum pump, then activate the PLC, and afterward slowly close the blower’s vent valve?
You divided it into two paths – are you sure one of them is for venting? Still go straight to the vacuum pump?