Utilization of oil sludge by pyrolysis with peat method

   The method of the utilisation of the hydrocarbon-containing wastes of oil products refining by the pyrolysis of their mixtures with peat in mobile and stationary layers with liquid and gaseous products obtaining and the reduction of the ecologically dangerous emissions of pollutants is proposed. It is established that depending on the conditions of pyrolysis process it is possible to obtain different target product. At the pyrolysis of the mixtures of peat with oil sludge in a stationary layer (at heating rate of 8 ºС/min) the greatest energy productivity is achieved by liquid tar obtaining (output is 40–55 %). At the same time, medium-speed (30–40 ºС/min) pyrolysis in a moving bed makes it possible to obtain greater energy productivity due to the gas component (gas output – 65–70 %). Thus, the comparative analysis of pyrolysis results showed that pyrolysis in a moving lawyer is more appropriate for gaseous products obtaining, in a stationary lawyer – for liquid tar obtaining. An increase in the addition of paraffin-containing waste to peat during pyrolysis in the stationary lawyer leads to a significant increase in the liquid fraction (up to 67 % of the initial peat). The qualitative composition of pyrolysis gas also changes, the content of unsaturated hydrocarbons and methane increases, which leads to an increase in the heat of the combustion of pyrolysis gas compared to the original peat. The obtained results on the pyrolysis of mixed compositions on the base of oil sludge (two types) and peat have shown that the specified method of their utilisation can be estimated as acceptable in terms of liquid and gaseous energy carriers obtaining, but in terms of the balance of costs, economic indicators and other factors still requires serious additional study.

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