Study on the Technology of Resources Utilization of Oilfield Heavy Oil Sewage Sludge
The paper introduces the whole process ideas of pyrolysis and resources utilization of the heavy oil sewage sludge. Experiments of pyrolysis temperature optimization, the yields and composition analysis of pyrolysis products, the conditions optimization experiment of recycling aluminum salt from pyrolysis residue and the analysis of pyrolysis residue adsorptivity were carried out. These experiments shown that: when pyrolysis temperature was 600°C, oil content of pyrolysis residue could be controlled within 3.0‰, oil recovery rate could hit 10%, and C1-C3 hydrocarbons components of pyrolysis gas could reach 90%; gasoline, kerosene, diesel and other light components in pyrolysis oil could be amounted to 60%. When the following conditions were chosen: decarburization temperature of pyrolysis residue was 700-750°C, calcination time was 0.5-1h, acid dissolution time at normal temperature was 2-5h, concentration of HCl was 25-30%, molar ratio of Al and HCl was 1:1.0-1:1.2, aluminum dissolution rate could hit 90%, aluminum concentration of dissolved liquid could hit 10%. When pyrolysis final temperature was 600°C, residue with adsorption properties on the removal effect of COD and oil from oilfield oil sewage could be better than activated carbon.