Process plan for concentrated sulfuric acid coolers
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This post was last edited by sunjl1981 on 2013-1-6 at 21:02. In the ion-exchange membrane chlor-alkali process, during the drying of chlorine gas, it is necessary to cool the concentrated sulfuric acid before it enters the drying tower in order to ensure an effective drying effect. Currently we use shell-and-tube cooling, but the cooling effect is not good; this is likely due to the low flow rate of the concentrated sulfuric acid, which results in poor heat exchange. Previously, plate heat exchangers were used, but the gaskets would break frequently. I’d like to ask how everyone solved this problem. Thank you. hcbbs !! .
It is better to choose a plate heat exchanger; a small spiral plate heat exchanger can also be an option. Before sulfuric acid enters the drying tower, it is crucial to filter out the acid sludge to prevent the tower trays from becoming clogged, which could cause chlorine to take a shortcut. EPDM gaskets can be used for plate heat exchangers; they are very effective and work just fine.
A vertical installation of a tube-type heat exchanger yields better results; if you don’t believe it, give it a try
The plate-type design offers a larger heat exchange area; the main purpose is to ensure that the concentrated sulfuric acid entering the system contains as little acid sludge as possible. A filtering device can be added before the metering pump to prevent the acid sludge from clogging the filters and tray plates
This post was last edited by I’m Hanhan on 2009-9-1 13:32. Are you considering using a rising film heat exchanger? Theoretically, this can improve the heat transfer efficiency. You can give it a try. The gaskets of plate heat exchangers are indeed a cause for concern.
This post was last edited by I’m Hanhan on 2009-9-1 at 13:32. The question is whether or not a film-forming device should be installed on the tube bundle I would appreciate your advice.
For concentrated sulfuric acid, spiral-plate heat exchangers can be used; it is necessary to choose the right material as early as in the first section of the tower. Plate heat exchangers made of Hastelloy are a good choice, offering high efficiency
A vertical shell-and-tube heat exchanger can be used. The material can be Hastelloy or 316L. Simple structure, easy to maintain.
How is it installed, and where in the system is it placed? Also, which one, sulfuric acid or the cooling medium, goes through the tube side and which goes through the shell side?
I have previously published on Shanghai Chuan. Due to the large difference in specific gravity between cold sulfuric acid and hot sulfuric acid, as well as their high viscosity, in a horizontal setup, if the tube sheet seal is not proper, hot sulfuric acid is more likely to find alternative paths for flow. A vertical setup is relatively better, which is why a vertical configuration is recommended. Also answering why for my sister.
Many of our plate exchangers work fine even when used with sulfuric acid. I’m not sure about your specific temperature, pressure, and flow rate – could you tell me those values?