After the desulfurization tower was overhauled and put back into operation, the slurry density would not increase
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In March, we completed the maintenance of one desulfurization tower; it has been in operation for about 20 days now. However, the concentration of ammonium sulfate is rising slowly, and these past few days it has dropped inexplicably, with the density also failing to increase. We keep the pH level between 5.5 and 6.5. Experts, please help us analyze the reasons for this. Our process involves a single tower with three spray layers; ammonia water is added at the inlets of the circulation pumps in the lower two layers. There is an oxidation and aeration layer at the bottom of the tower, along with pulse stirring. The flue gas processed by our tower includes boiler exhaust gas as well as the exhaust gas resulting from Claus sulfur recovery processes.
It can’t crystallize; is it because impurities in the upstream gas prevent ammonium sulfate from crystallizing?
Selection of nozzles, diameter of the tower and nozzle distribution, flow rate and head of the circulation pump (feeding into the tower), flow ratio of flue gas to liquid (liquid-to-gas ratio)
Hehe, these things are all fixed; it’s just that new problems arose after the maintenance.
OP, which company’s ammonia-based desulfurization equipment is it? By looking at the desulfurization amount, it is possible to estimate the rate of increase in slurry density. Based on your description, check whether the sulfur content of the imported material is relatively low, and whether there are significant differences in the liquid level measurement of the desulfurization tower solution
Sources of the density data for the anhydrous sulfuric acid solution: online monitoring, pycnometer sampling, and results from manual analysis sampling. There are two reasons for the slow increase in density: 1. The SO2 content in the flue gas at the inlet of the desulfurization tower is low ； 2. The sulfuric acid AN post-treatment system achieves high yields of sulfuric acid AN ； 3. High amount of aerosol entrainment at the exhaust outlet of the desulfurization tower chimney (collapse or detachment of the mechanical mist remover module). Based on the process you described, it is similar to the ammonia-based desulfurization processes used by Jiangsu and Yichang. Poster: I’m very interested in your proposal regarding the use of a desulfurization tower to treat the exhaust gases generated after Claus sulfur recovery and combustion. I wonder which process package your company uses for the Klaus process. Contact: qq281675558
Compared to before, our aerosol levels are very high; basically half of them have escaped