Publish in OALib Journal
APC: Only $99
Under the assumption of considering the gravity and
without gravity, two different acceleration models to describe particle’ motion
in the gas flow are formulated, respectively. The corresponding numerical
simulations of these models do not only show the trend of the velocity of the
particle in different density and particle diameter sizes, but also the relationship
between the maximum particle velocity and its diameter size.
China has rich lignite reserves which are the proper resources to be liquefied. As its low coalification degree, much hydrogen is wasted. Solvent extraction can save hydrogen and improve its liquefaction performance. The paper studies supercritical methanol treatment of lignite with a device at high temperature and pressure. Experiments mainly focus on the effects of temperature, pressure, catalysts and pretreatment ways on the extraction rate. Results indicate that the extraction rate increases with raising of temperature and pressure below 330 ℃,10 MPa. When temperature exceeds 330 ℃, extraction rate decreases slightly. After swelling pretreatment in methanol for 8 h, the lignite is treated for 60 min at 330 ℃，8.2 MPa with NaOH as catalyst(1%wt). The weight ratio of methanol/ Xilinhaote lignite is 5/1. Under these conditions, the extraction rate can reach 22.88%.
We introduce a new class of the slash distribution using the epsilon half normal distribution. The newly defined model extends the slashed half normal distribution and has more kurtosis than the ordinary half normal distribution. We study the characterization and properties including moments and some measures based on moments of this distribution. A simulation is conducted to investigate asymptotically the bias properties of the estimators for the parameters. We illustrate its use on a real data set by using maximum likelihood estimation.