What is the effect of concentrating lime digestion and SO2 absorption within the desulfurization tower?
Thread Content
There is a CFB-FGD process in which the lime digestion reaction and the SO2 absorption reaction are carried out together within the desulfurization tower; for example, this is the case in the desulfurization project at the Jiaozuo Power Plant in China. Please discuss the advantages and disadvantages of this process!
This post was last edited by zfc318 on 2010-7-9 00:00. This is currently the most common method for flue gas desulfurization used by engineers. The process is simple, and it has a long service life. However, the disadvantages of this process are also well known: 1. During the production process, if control is not proper, limestone (scale) can easily cause blockages in the absorption tower. 2. Generation of CO2 pollution ； The sulfur gypsum produced at the same time is not as good as one might think, and it depends on its color. It’s not easy to sell. 3. It has high energy consumption, and the generated wastewater is also a problem. ....... In short, I believe this manufacturing process is a technology that should be phased out and is not worth promoting in our country.
Thanks to the friend upstairs for replying! The gypsum content in the components of dry and semi-dry desulfurization by-products is not high, making comprehensive utilization generally difficult ； What the friend upstairs said applies to the general semi-dry desulfurization method. Please share your opinions on this rather special desulfurization process in which digestion and desulfurization are carried out in a single reactor! !
2. Generation of CO2 pollution； The sulfur gypsum produced at the same time is not as good as one might think, and it depends on its color. It’s not easy to sell. Question: Can CO2 in flue gas be absorbed by regenerated alkali to produce sodium carbonate or sodium bicarbonate?
I have an idea: the lead sulfate sludge is first subjected to wet desulfurization using sodium carbonate to produce lead carbonate, which is then melted in a blast furnace； Lime is used to regenerate the desulfurization solution, and this regenerated alkali is then used to remove carbon dioxide from the blast furnace exhaust gases to produce sodium carbonate, which can be reused for desulfurization. Moderator, is this approach technically feasible? What are the investment costs, and what are the operating costs? Is there any relevant experience to draw upon?