Energy use of the solid-phase product of oil sludge waste thermal conversion

The process of ignition and subsequent combustion of the solid-phase product (carbon residue) of the steam gasification of oil sludge waste (OS) was studied, its physical and chemical characteristics were determined, and the energy applicability was evaluated. It was found that the product is characterized by a high content of ash (Ad = 70 wt%) and sulfur (Sd = 1.7 wt%). The lower heating value was 14.2 MJ/kg. According to the thermal analysis data, the initial and final temperatures of intensive oxidation were 248 °C and 518 °C, respectively. The ignition delay time exponentially decreased by 67% with increase in the temperature of the heating medium (from 500 to 700 °C). The combustion process at Tg = 700 °C was accompanied by the formation of flame near the fuel sample.