The high content of thiosulfate AN in the desulfurization solution affects salt recovery
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Our plant uses HPF single-tower wet flue gas desulfurization. At the end of last year, due to issues within the plant, the suspended sulfur content in the circulating liquid rose by 30-40%. Since September this year, there has also been an excess of sulfur paste, and the concentration of the two salts in the desulfurization solution is around 200-250. The test results obtained by our laboratory differ from those of the laboratory responsible for salt extraction by 50-60 units. Currently, the team in charge of salt extraction reports a sulfur level of 12+, which is affecting their production. How can this problem be resolved?
Remove the salt – what is your salt content?
Control it at the source: keep the temperature of the circulating liquid low, as otherwise the formation of these two salts occurs rapidly. Changing the liquid is a method that can effectively reduce the concentration of these two salts; however, it involves handling waste liquid. If thio-high levels persist, it’s possible to dispose of the mixed salts
Thio-alkane, and then there is tower-type desulfurization. Poor regeneration
If the suspended sulfur level is too high, it can clog the tower; this is likely due to poor sulfur recovery efficiency. It is recommended to improve the treatment of sulfur foam
The quality of coal is also a controlling factor. Choosing the right catalyst is also an option.
Pay attention to controlling the volatile ammonia in the absorption tower; repeated tests are needed to determine the appropriate level of control, which should be between 5 and 8. The ratio of circulating liquid flow to compressed air volume should be between 1:1.25 and 1:1.3 in order to accelerate the conversion rate of sulfur foam. The specific values need to be verified by continuously adjusting the various parameters of the absorption tower based on the sulfur content in the coal.