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.
脱硫过程比较复杂，下面小编就给大家详细的介绍一下：
The process of desulfurization is rather complicated. The following section will give you a detailed introduction:
1、烟气中的SO2与水H2O生成亚硫酸H2SO3。
1. H2SO3 sulfite is formed from SO2 in flue gas and H2O in water.
2、烟气中的SO2与喷淋水中的Ca(OH)2反应生成CaSO3沉淀。
2. CO2 in flue gas reacts with Ca(OH)2 in spray water to form CaSO3 precipitation.
3、烟气中的CO2与喷淋水中的Ca(OH)2反应生成CaCO3沉淀。
3. CO2 in flue gas reacts with Ca(OH)2 in spray water to form CaCO3 precipitation.
4、在循环水喷淋过程中CaCO3被H2SO3置换成CaSO3。
4. CaCO3 is replaced by H2SO3 in the spraying process of circulating water.
5、在循环水喷淋过程中CaSO3被烟气中的氧O2成CaSO4沉淀。
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.
注意事项：
Matters needing attention:
1、每班(8小时)搅拌石灰浆2-3次。
1. Mix lime slurry 2-3 times per shift (8 hours).
2、每班清理除尘器底部沉淀物1-2次。
2. Clean the bottom sediment of the dust collector 1-2 times per shift.
这种脱硫技术的缺点是: 管道及喷咀易堵塞。
The disadvantage of this desulfurization technology is that the pipeline and nozzle are easily blocked.
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2019-08-19
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