Pilot Test on Oily Solid Waste Disposal by Thermal Desorption of Moving Bed

摘要

Oil-contained solid wastes subsidiary produced in process of oil and gas exploration and production are classified as hazardous wastes. Oily solid waste is necessary to reduce the total petroleum hydrocarbon (TPH) content to required targets before discharging. A thermal desorption test equipment of electromagnetic heating in moving bed was set up, and estimated processing parameters of thermal desorption unit (TDU) based on thermal calculation. Constant wall temperature of heating bed was helpful for rapid thermal desorption disposal, and power output of heating bed was not constant on each section. Rapid thermal desorption tests of two samples were carried out on pilot equipment. Under the residence time of 12.5 minutes, sample #1 was processed at bed wall temperature of not less than 450 °C, TPH content could be reduced to 1%, and to achieve the same disposal effect, sample #2 should be processed at bed wall temperature of not less than 500 °C. The residence time was reduced to 7.2 minutes, TPH content of treated sample #1 could be reduced to less than 1% at bed wall temperature of 500°C, while the disposal effect of sample #2 was fail to reach the standard.