Zero emissions of flue gas from desulfurization alcohol alkali solution regeneration
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Recently, I came across a process in which the alkali solution used for desulfurization is regenerated; the oxidized exhaust gas is pressurized using a compressor and then reused. Nitrogen and oxygen are used instead of air to eliminate the impact of carbon dioxide in the air. An oxygen content monitor is installed in the exhaust gas line, and pure oxygen is added to maintain the desired oxygen level, while recycled nitrogen is used to keep the pressure at the appropriate level, thereby achieving zero exhaust gas emissions. I wonder which classmate has this technology at home; thank you!
It is a new technology that enables zero emissions not only for exhaust gases but also for alkaline slag. It is already in place, but operations have not yet started on a regular basis
This post was last edited by Refiner on 2017-4-28 09:13. It’s a great concept and idea, but it’s difficult to implement; a good distributor is needed, otherwise oxygen will be wasted. Furthermore, when using pure oxygen, in addition to considering its safety, attention must also be paid to oxygen flow control, as controlling a low flow rate is no easy task either. The control of oxygen volume is also an issue that needs to be addressed; what determines the amount of oxygen to be injected. New things face difficulties; let’s work together.
The conceptual approach for the process is great, but whether it can achieve the desired promotional effect remains to be seen in practice! Nitrogen + oxygen is used in place of air to eliminate the effect of carbon dioxide in the air, but liquefied gas itself contains carbon dioxide, and carbonates are also formed during the hydrolysis of COS; it is impossible for no carbonates to accumulate in the circulating alkali solution. The so-called zero-alkali slag also does not include the alkali slag from pre-alkaline washing; since pre-alkaline washing has been replaced by fixed-bed treatment, how much does the cost increase? From the perspective of sulfur balance, where does all the sulfur in liquefied gas end up? There’s nothing in the exhaust gases; it has just gone into the solvent oil and alkaline residue. In short, it is unrealistic to expect no waste to be generated in the refining process; it’s just a matter of how much and what type of waste there is. Hope for a major breakthrough!