Design issues of packed towers for removing paint particles from spray painting exhaust gases!
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This post was last edited by zhwr5200 on 2016-12-30 at 13:51. Paint exhaust contains paint particles; these particles are first removed using a packed tower, and then the exhaust gas is treated through activated carbon adsorption! I’m facing some issues when designing a packed tower; I’m not sure how to determine certain physical property values, such as the diffusion coefficient DL of paint particles in water, the average molar mass M of the mixed gas, the viscosity μ of the mixed gas, and the diffusion coefficient D_air of paint particles in air... How can these values be determined? I hope those who know the answer can offer some guidance! Or perhaps my approach is wrong; filler towers should not be used to handle the paint particles in spray painting exhaust gases! I hope experienced drivers with knowledge in this area can help answer my questions! I would be extremely grateful!
Did I not express my question clearly enough?
This paint can’t be dissolved, right? There are also issues related to dispersion. The filler might easily cause blockages; it would be better to use a dry tower spray system, just like in flue gas desulfurization. That’s my personal suggestion
Place some random rings, similar to Bower rings; the specific height depends on your operating conditions. When they get dirty, take them out and wash them
Thank you very much; I just don’t know how to determine the height of the packing layer. May I ask how to determine the specific height based on operating conditions? Is there any theoretical basis for this? Is it still determined based on experience?
The selection of the packing height takes into account pressure drop, operating factors, as well as the efficiency of packing use; experience is also very important
First, you need to determine whether your paint particles are water-soluble ! Also, it’s easy for particle matter to cause clogging when using a packed tower! ! Be careful! !
This post was last edited by zhwr5200 on 2017-1-5 at 12:02. Paint particles are insoluble in water; generally, an AB agent is added to the circulating water tank to remove the components that absorb paint. The aggregated paint floats to the surface of the water tank, where it can be removed manually at regular intervals, which helps to reduce clogging of the filters. The use of a packed tower is intended to increase the gas-liquid contact area, allowing the particles and water to come into full contact with each other, while simultaneously reducing the power consumption of the circulation water pump. I checked the design parameters of relevant manufacturers; the gas velocity in an empty tower is usually set at 1.5 m/s, and based on this value, the diameter of the tower can be calculated. There’s one issue I’m not quite clear about: it’s difficult to determine the liquid-to-gas ratio in this situation, as paint particles are insoluble in water, so it’s not possible to determine the liquid-to-gas ratio based on material balance calculations. At the same time, it is also impossible to determine the height of the filler layer. I wonder if experts have any experience in this area and could provide some guidance! Thank you so much.
Your goal is to remove the particles, right! Why use water to remove particles? A dust collector can be used!