Biogas desulfurization with limewater is a relatively low-cost desulfurization technology. In the process of using limewater as desulfurizer, only low-cost CaO is consumed. The waste is a mixture of CaSO4, CaSO3 and smoke and dust. Water can be permanently recycled in the system.
The process of desulfurization is rather complicated. The following section will give you a detailed introduction:
1. H2SO3 sulfite is formed from SO2 in flue gas and H2O in water.
2. CO2 in flue gas reacts with Ca(OH)2 in spray water to form CaSO3 precipitation.
3. CO2 in flue gas reacts with Ca(OH)2 in spray water to form CaCO3 precipitation.
4. CaCO3 is replaced by H2SO3 in the spraying process of circulating water.
5. CaSO3 is precipitated into CaSO4 by oxygen in flue gas during the spraying process of circulating water.
In order to reduce the consumption of CaO (lime), the PH value of spraying water should be kept between 5 and 6 in the spraying water cycle. When the PH value of spraying water drops below 5.5 due to the increasing concentration of H2SO3, water lime should be stirred to make the PH value of spraying water reach above 8.
Matters needing attention:
1. Mix lime slurry 2-3 times per shift (8 hours).
2. Clean the bottom sediment of the dust collector 1-2 times per shift.
The disadvantage of this desulfurization technology is that the pipeline and nozzle are easily blocked.
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