What kind of packing is good for benzene washing towers?
Thread Content
The gas production is approximately 65,000 Nm3/h, and the recovery rate of crude benzene is 1.1%. Which type of packing is suitable for a benzene washing tower?
Stainless steel corrugated plates work well, but I’m worried about clogging
Metal mesh packing or new type of plate corrugated packing
Our plant uses stainless steel orifice plate corrugated packing, which generally does not get clogged; if it does, it can be cleaned with hot lean oil
Stainless steel corrugated packing for Y-125
Fillers made of metal mesh tend to get clogged, and it is difficult to clean the tower
Stainless steel corrugated orifice plate packing must be the best option. Our factory handles a relatively small volume of gas, and we use ceramic ring packing, which tends to get clogged; we have installed a hot lean oil cleaning device on top, and I find that its cleaning effect is quite good.
What is commonly used these days are stainless steel orifice plates with corrugations; compared to other types, they offer a larger specific surface area, are lighter in weight, and ensure more even distribution of gas and liquid. As for the issue of blockages, as long as the preceding processing stages operate properly, the problem should be minimal when it comes to crude benzene.
Preliminary estimate: tower diameter of around 1.8 meters, 2 sections of 250-sheet corrugated packing.
Early benzene washing column fillers included wooden grids and steel mesh screens; due to their low efficiency and low flux, the equipment used was relatively large, with some systems employing two or three columns in series for absorption. With the increasing demands for gas purification and the emphasis on chemical product recovery, it has gradually been replaced by high-efficiency fillers. The more common types include perforated plate corrugated packing, lightweight ceramic packing, plastic wreath packing, and stepped ring packing. Among the corrugated packing materials for stainless steel orifice plates, the 250Y type is the most suitable for use in benzene washing towers due to its high efficiency and large flow capacity. But the downside is that it is relatively expensive. Therefore, some manufacturers choose 250Y-type fillers made of polypropylene, which not only offer high efficiency but are also inexpensive. The coking and gas production plant at Hebei Tangsteel has been in use for 4 years with excellent results; the benzene content in the gas remains below 2.5 g/m3. Its drawback is that it cannot be purged using steam. Light porcelain fillers are also widely used nowadays; their advantages include low cost, good resistance to clogging, and the ability to be cleaned with steam. However, their disadvantages are low flux and susceptibility to breaking. The plastic wreath packing and the stepped ring packing fall between the first two in terms of efficiency and flux, with the stepped ring packing having slightly better anti-clogging properties and flux than the plastic wreath packing. This post was last edited by Chuangxin Filler on 2009-4-11 23:13.]
Could you provide a figure for calculating the packing height? Light porcelain filler is used! Thank you!
Our gas flow rate is 8,000+ Nm3/h, with a recovery rate of less than 1; Ball rings are used in this system