Tingyu Zhu
Chinese Academy of Sciences, China
Title: Applications of carbide slag in the wet desulfurization process for flue gas
Biography
Biography: Tingyu Zhu
Abstract
In China, the output of polyvinyl chloride (PVC) reached to 13.7 million tons, and nearly 80% of the production used the calcium carbide method. Meantime, 20 million tons of carbide slag was obtained as waste solid in the production of PVC. The extremely rough disposition of stacking and being open to the sky has not only occupied precious land but also polluted the earth and shallow groundwater. Besides, numerous industrial processes emitted great amount of SO2 and other pollutants. Under the background of waste solid and air pollution control, we developed a wet desulfurization process for flue gas using carbide slag as desulfurizing agent. Double tower absorption technology was used. The desulphurization efficiency was more than 96% with the utilization rate of desulfurizer being above 90% by optimizing the feeding speed, water circulation, and the oxidation and crystallization of calcium sulfite. The technology has been applied in some chemical plants in the middle and western China, where the calcium carbide process majorly distributed.