The most substantial feature of shale oil and power cogeneration is the technology that uses the high-temperature solid phase from the ash separator of a circulating fluidised-bed (CFB) boiler as the heat carrier in the rotating drum reactor in oil shale retorting equipment rather than high-temperature ash from a single-purpose built-in semi-coke burning furnace. Retort products generated in the rotating drum reactor are separated from semi-coke in the separator and canalised into the condensing and cleaning equipment. Semi-coke is transported into the CFB furnace. All co-products generated in this technological process, such as phenol water, drying agent containing oil shale particles etc., are defused in the furnace of the CFB boiler. The application of such technology makes it possible to minimise the dangerous waste of shale oil production and guarantee the maximum use of oil shale energy.
High-temperature corrosion resistance of a number of boiler steels was tested experimentally in laboratory and industrial conditions in the presence of chlorine-containing external deposits. Empirical kinetic equations for calculation of corrosion depth depending on operational time and temperature were established, and the dependence of corrosion resistance of the austenitic steels on the alloying elements ratio Ni/Cr was analyzed.
Shale oil and power cogeneration (SPC) technology, which uses the high-temperature ash of a circulating fluidized bed (CFB) boiler as a solid heat carrier (SHC) for retorting oil shale in the retorting equipment, was analyzed by a mathematical model. The parameters and relationships of SPC technology dependent on the initial temperature of SHC and the heating value of oil shale were calculated. The application of SPC technology with a condensing turbine allows approximately 2.5 kWh electricity to be generated per one kilogram of shale oil. In the retorting process, the calculated relationship SHC/oil shale as received is in the range of 1.7-1.9 if the temperature of SHC is 750 °C. The application of SPC technology increases the content of CO 2 and water vapour in the flue gas in the CFB boiler.
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