Factors affecting the specific consumption of alkaline solution in catalytic flue gas desulfurization devices
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Factors affecting the consumption of alkali solution in catalytic flue gas desulfurization units. At present, most domestic refineries use catalytic flue gas desulfurization technologies developed by American companies such as Berger and Norton, German company Kiessling, Beijing Luye Company, and Sinopec Ningbo Design Institute. For catalytic units of similar scale, the consumption of alkali solution varies among different manufacturers. What is the reason for this? I would appreciate it if experts could help analyze this issue
It is related to the pH control in the alkali solution circulation and the volume of alkali solution circulation, but the key factor remains the sulfur content in the flue gas
In fact, what’s most crucial is the properties of crude oil – namely, the high level of sulfur, which is either present in the flue gases or in the final product; it must be treated in order to meet the standards.
Does an increased circulation rate of the alkaline solution lead to a higher tonnage consumption of the alkaline solution?
As the circulation volume increases and the pH of the circulating solution remains constant, the desulfurization efficiency of the alkaline solution will definitely be better, though the specific consumption will certainly increase
The sulfur dioxide emission level in the flue gas when the circulation rate is between 600 and 1000 remains the same; does this also have an impact on alkali consumption?
The amount of alkali used is still related to the control of sulfur content in the flue gas; maintaining a stable pH level of the circulating fluid is key. In fact, it’s mainly the pH level that needs to be controlled. Given the large volumes of water added and removed, it is feasible to adjust the amount of alkali added by monitoring the pH value.
I disagree with an increase in the circulation volume and an increase in specific consumption, because the desulfurization effect improves only up to a certain limit as the circulation volume increases. Even if the effect is good, we need to ensure that the purified flue gas meets the emission standards, with the alkali consumption remaining unchanged. If the emission criteria for purified flue gas are not treated as a control factor, I agree.
The external discharge volume also depends on the pH value of the wastewater, right? If the pH value of the wastewater remains unchanged, it has no impact either.
Personally, I think it is more reliable to control several conditions as constants when analyzing the factors affecting specific consumption. Otherwise, there are too many influencing factors.
We keep our pH level between 8 and 9