Study On The Basic Characteristics Of The Huadian Oil Shales And Their Semi-cokes

Oil shale is a kind of low-grade fuel,with high ash and volatile but low calorific value. The by-product of oil shale retort processing is called semi-coke, which is the mixture composed of many chemical group components with the same as oil shale. Semi-coke obtained from oil shale retorting process contains the organic composition, but seldom utilized till now, mostly with so-called "semi-coke deposit" as offal. Oil shale semi-coke impacts on environment,which has harmfulness even more than the oil shale ash. So, it is obviously important to research basic characteristics of semi-coke and handle it in the oil shale industry.The basic characteristics of the Huadian oil shales and their semi-cokes were investigated and compared. The properties of the oil shales and their semi-cokes such as density , oil yield, ash deposition, ash fusion temperature,grindability,soaking and drying test of semi-coke, analysis of shale oil product and methane gas were investigated. The results show that the Huadian oil shale is a kind of low-grade fuel with high ash, high volatile and low calorific value. Oil shale quality differs in different mine areas; The Huadian oil shales and their semi-cokes show great similarity in ash deposition and ash fusion temperature. The density,viscosity,freezing point,distillation range of shale oil were measured. The compositions of methane gas was analyzed. Experiments on combustion characteristics of Huadian oil shale semi-coke have been done conducted on Pyris1 TGA thermogravimetric analyzer (PE/USA) , and combustion characteristics of semi-cokes were studied on some typical conditions such as oil shale species, different particle sizes and heating rate. which provided theoretical foundation for further effective exploitation and economical application of oil shale semi-coke.