Study on the Emission Characteristics and Mechanism of Sulfur-Containing Gas During Sludge Pyrolysis at Low Temperatures

In order to explore the influence of the release of sulfur-containing gases in the process of sludge pyrolysis, temperature, time and calcium-based conditioner were selected to conduct low-temperature sludge pyrolysis experiment on sludge, and effective measures to control the release of sulfur-containing gases such as CS 2 , H 2 S and SO 2 were proposed. The experimental results show that when the temperature is below 200℃, the release of H 2 S gas is less than 50 µg/g. The release amounts of C 2 S and H 2 S within 3min were 20.84µg/g and 339.42µg/g, respectively. Combined with the release characteristics of the three gases, it was concluded that the drying temperature of the sludge was controlled below 250℃ and the drying time was controlled within 1 min. The concentration of sulfur-containing gas is 59.81 mg/m 3 , 94% lower than that of dry pure sludge gas when the addition of calcium base powder is 20% of the original sludge mass fraction. After absorption of calcium base powder, there are almost no organic compounds containing sulfur and sulfur gas. The research results provide a direction for the selection of pyrolysis sludge treatment process, which is beneficial to control the discharge of harmful gases.