79. Enhancement in Sulfur Retention of Calcium-Loaded Coal by Ultrasonic Treatment (UST)

概要

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In order to improve SO_2 removal efficiency, ultrasonic irradiation was used for the hydration treatment of the mixture of coal and CaO. The experiment on sulfur retention was carried out in a fixed-bed reactor. The results show that calcium loaded with ultrasonic irradiation can capture sulfur more effectively. The desulfurization efficiency was raised from 37% with non-ultrasonic treatment to 73% with ultrasonic treatment, at a Ca/S ratio of 1.5. The effect of ultrasonic wave is also affected by ultrasonic power and irradiation time. XPS analysis reveals that, by ultrasonic treatment, a portion of sulfur (organic sulfur or pyrite) was oxidized to sulfate, which is one reason for the increase in SO_2 removal.
2001-11-13