Key operating points of the dual-tower pressurized stripping process for small-scale units and actual situations encountered in sulfur recovery operations
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This post was last edited by liaifeng on 2018-8-3 21:56. Regarding the key operating points and precautions for the double-tower pressurized stripping process, as well as the problems that have occurred in practice, I appreciate it if colleagues can provide answers (it’s not small absorption towers or large absorption towers; rather, it refers to desulfurization towers and denitrification towers). There are also certain precautions that need to be taken during the sulfur recovery process in actual operations. I’m new to this, and I hope I can get help from experts everywhere
I’ll throw out some ideas to stimulate discussion. . . . For the desulfurization tower, pay attention to gas-phase extraction; avoid carrying ammonia along with liquids, as this can lead to the formation of ammonium salts that may clog the pipelines. Pay attention to the gas-liquid ratio in terms of tower load, and use cooling water at the top of the tower to absorb ammonia and reduce its temperature. The ammoxidation tower is relatively better, as the gas phase at the top is condensed and cooled, and the reflux stream is used to purify the mixture. It is not known whether there is heat exchange between the purified water and the wastewater; if so, check the temperature of the wastewater entering the tower and clean the heat exchanger promptly.
Thank you; I’ve been researching for a long time now, but the installation still hasn’t started. It’s confusing.
I have cold feed here to control the top temperature of the tower, as well as heat exchange between sulfur-containing wastewater and purified water. There are three heat exchange sections here. The sulfur-containing wastewater is heat-exchanged with the gas from the ammoxidation tower, purified water, and condensed water respectively
The double-tower stripping process should be similar in all cases. . If the composition of the incoming water is complex, it is recommended to install an online backwash filter, which will allow the wastewater-to-purified water heat exchanger to operate for a longer period of time.
Here, the sulfur content is 7400 and the ammonia nitrogen level is 14200