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Overview of mid-range magnesia flue gas desulfurization technology

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Overview of mid-range magnesia flue gas desulfurization technology

2021-03-03 15:42:40
Times

The mid-range magnesia magnesia desulfurization technology has many applications around the world. Among them, more than 100 projects have been applied in 13 books. The price of fused magnesia is 95% of power stations in Taiwan using the magnesia method. The United States, Germany, etc. The land capital has been applied, and my country has begun to promote it, and it has been applied in a few areas. Compared with calcium desulfurization, magnesium oxide desulfurization avoids a series of problems existing in simple wet methods, such as pipeline blockage, low flue gas temperature, water in flue gas and secondary water pollution; the maturity of the process is only Second to the calcium method, the structure is simple, the area is small, the source of raw materials is sufficient, the operating cost is low, the safety performance is good, the investment is greatly reduced, and the secondary pollution can be reduced, the desulfurization agent is recycled, the desulfurization cost is reduced, and the overall economy is Benefits have been greatly improved.

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The power plant (2x225MW) unit flue gas desulfurization renovation project (FGD) adopts magnesium oxide wet desulfurization technology. The process system is mainly composed of desulfurizer slurry preparation system, flue gas system, SO2 absorption system, desulfurization tower exhaust system, and magnesium sulfite dehydration system , Process water system, wastewater treatment system, miscellaneous and instrument compressed air systems. The entire FGD basically adopts a closed-circuit water circulation method. The wastewater mainly comes from the desulfurization process of the desulfurization tower. The water in the desulfurization device slurry will be enriched in heavy metal elements and F-, C1- in the process of continuous circulation. On the one hand, it accelerates the corrosion of the desulfurization equipment. On the one hand, it affects the quality of desulfurization by-products. Therefore, a certain amount of wastewater discharged from the desulfurization device has obvious high-salt characteristics, and its heavy metal ions, acid radical ions, and ss content exceed the standard. At the same time, the pH value does not meet the emission standards, and targeted treatment is required. This article only briefly describes the design of the wastewater treatment system of the flue gas desulfurization renovation project.

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