High temperature sulfuric acid heat exchanger
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The high-temperature sulfuric acid heat exchanger (heat exchange between 180°C sulfuric acid and 104°C deoxygenated water) is prone to leakage during use. The water side pressure is high and leaks into the acid pipe side. Can anyone talk about the reasons in terms of heat exchange medium and heat exchanger materials?
I think so. It is better for the water side pressure to be higher than the acid side pressure. Once the leaked water enters the acid side, it releases heat violently. The heat exchanger would vibrate, which was quickly detected. on the contrary. The acid leaks out. This whole water cycle is ruined. The dilute acid made the equipment rotten to pieces. ;P
The pressure on the water side is too high. Should you consider increasing the heat exchange area? How about choosing 316L as the pipe material? Sulfuric acid forms a dense oxide film on the surface of the pipe. Secondly, can you consider using an anode protection device?
I also think anode protection is better
Can an anodically protected acid cooler withstand 180°C? Looking forward to solution
This post was last edited by penryn on 2011-9-30 22:27 and replied to 5# melao It might work. It is to add external current to increase the potential of the material. to improve corrosion resistance. However, if the current is not regulated properly, it is easy to corrode, so now there are acid coolers in China that do not require anode protection. But the cost is relatively high
Not bad, learn* . . . . . . . .
It depends on the concentration of sulfuric acid? There are different materials in different concentrations. The discussion is meaningless apart from this point. The temperature of anode protection +316 material used on 93%-98% acid should not exceed 120°C. Only when LZ gives the mass concentration of sulfuric acid can we discuss what materials to use. After checking, the only one that is suitable for all concentrations is Pt (platinum). No one uses this as a heat exchanger and no one can afford it.
Reply 8# lging Thank you for your reply. The sulfuric acid concentration is 99.3%~99.6%wt.
Haha, LZ is talking about the water heater for low-temperature recovery. It seems that the anode protection at such a high temperature is too much. At present, the materials for this kind of heat exchanger in China are mostly made of Monsanto and Xuanda.
Reply 10# she* rong2006 There is very little information on these two companies. Can it be announced?