METHOD AND PLANT FOR OIL SHALE PROCESSING Russian patent published in 2014 - IPC C10B53/06 C10B49/16 

FIELD: oil and gas industry.

SUBSTANCE: method of oil shale processing includes drying of oil shale in a dryer (1) by gaseous drying agent. Dried oil shale is separated from used drying agent at drying agent separators (2) and pyrolysed in pyrolysis reactor (4) with circulating solid heat carrier with formation of vapour gases and coke and ash residue. Coke and ash residue are burnt in flash furnace (6) with formation of gas suspension. The obtained gas suspension is divided by stages in solid heat carrier separator (8) and gas suspension separators (9) into solid heat carrier, flue gas and ash output from the process. The latter is cooled in ash heat exchanger (10), which has two sections - one for heating of blasting air for the flash furnace (6), while the second is for heating of blasting air for heat recovery boiler (11) with economiser (17). Flue gas together with char gas obtained at condensation section is delivered to be burnt at heat recovery boiler (11) with economiser (17). From cutting in the high-temperature section of the heat recovery boiler (11) with economiser (17) flue gas is collected as a drying agent to the flash dryer (1). Heat quantity for oil shale drying is regulated by the consumption rate of the drying agent, which is controlled by the valve (12), at temperature not exceeding the temperature value at commencement of oil shale pyrolysis depending on its moisture content. The used drying agent is subject to wash out from dust particles at electric precipitator (13) and discharged to the atmosphere through the smoke stack (14).

EFFECT: group of inventions allows decreasing environment pollution by gas discharges, increase efficiency of use for potential heat released from the processed fuel and efficiency factor for the whole plant.

2 cl, 1 dwg