Bench test on thermal desorption dispose of oily cuttings

Abstract

Abstract A thermal desorption bench test device was assembled, and electromagnetic induction heating method was adopted. The obtained samples were tested at different terminal temperature and residence time, and the processing capacity of each test was about 15 kg. Total petroleum hydrocarbon (TPH) content dropped rapidly with the terminal temperature increasing from 200 to 400 °C, and the TPH removal rate reached 96% when terminal temperature rose to 400 °C. The terminal temperature should exceed the final boiling point of containing oil for effectively removal. The residence time increased from 20 to 30 min; drops of TPH content were obviously. Continued to increase the residence time after 30 min, the TPH content decrease became slowly. Results suggest that terminal temperature and residence time should be matched reasonably to achieve the best disposal effect. The residual oil content of solid slag reduced to 3 mg/kg under conditions of terminal temperature of 400 °C and residence time of 30 min. Low-speed stirring of the material in process was helpful to improve the disposal effect. In the process of removing oil, water contained was completely disposed. The sample quantity of bench test was much larger than that of laboratory experiment, and the results might be a direct guide for industrial applications.

Keywords

• Bench test
• Electromagnetic induction heating
• Terminal temperature
• Residence time