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Magnesium desulfurization technology is increasingly receiving attention due to its low investment, low operating costs, good environmental benefits, recyclable by-products, and high economic benefits. The by-product recycling process can obtain relatively stable and high-purity magnesium sulfate heptahydrate, which brings considerable economic benefits to power plants.
After removing impurities from the desulfurization mixture, the solution is concentrated through an evaporation system. During the evaporation and concentration process, the discharge concentration and solid content of the evaporation system are controlled to ensure continuous and stable operation of the evaporation system, reduce the number of mechanical cleaning times, and use a vacuum system to lower the discharge temperature of the final effect, which to some extent reduces the heat load of the crystallization system. The concentrated solution is cooled and crystallized in the DTB crystallizer, and the temperature inside the crystallizer is strictly controlled to obtain stable magnesium sulfate heptahydrate. Subsequent centrifugation and drying systems can obtain high-purity magnesium sulfate heptahydrate products. The continuous operation of the evaporation, crystallization, and drying systems reduces the workload of workers and lowers the operating costs of the system, resulting in lower steam consumption of the evaporation system equipment. The steam consumption ratio of the triple effect evaporation system shall not exceed 0.4.