Yujie Yu

Bio: Yujie Yu is an academic researcher from Zhejiang University. The author has contributed to research in topics: Coal water & Slurry. The author has an hindex of 6, co-authored 8 publications receiving 264 citations. Previous affiliations of Yujie Yu include Guizhou University.

The Slurrying Properties of Coal Water Slurries Containing Raw Sewage Sludge

Abstract: Municipal sewage sludge always includes considerable amount of water, noxious substances, and varying chemical compositions; therefore, sludge utilization is imposed. Coal-sludge slurry (CSS), which is made by blending sewage sludge with coal, water, and additives, is being identified as a new and effective sludge utilization technology. The main objectives of the present investigation are research on the slurrying, rheology, and stability properties of five CSSs, and determine the influence of sludge type, sludge mixing proportion (α), temperature, and shear rate on the slurrying properties that play a critical role in CSS technology. Results showed that (i) the maximum solids loading (MSL) dropped sharply with the rise of α, ranging from 55.22% to 59.41% in the α = 15% case, compared to 69.16% in the α = 0 case; and (ii) the apparent viscosity dropped as the temperature rose from 20 °C to 50 °C, in an approximate linear correlation. All CSSs exhibited a pseudo-plastic rheology, and increasing ω and α re...

Properties of Coal Water Slurry Prepared with the Solid and Liquid Products of Hydrothermal Dewatering of Brown Coal

Abstract: Hydrothermal dewatering (HTD) was employed to dry and upgrade Inner Mongolia brown coal (IM) in an autoclave reactor at temperatures between 200 and 320 °C. It was found that the extent of decrease of moisture content and decomposition of oxygen functional groups in brown coal during HTD depended on temperature increase. X-ray photoelectron spectroscopy results showed that the proportion of carboxyl decreases from 16.57% to 4.38% and carbonyl decreases from 19.52% to 5.4% following the HTD process at 320 °C, and there was hydroxyl produced at low temperature that decomposed at high temperature. Liquid products from HTD were found to contain organic carbon ranging from 0.367 g/L at low temperature to 4.792 g/L at high temperature. Larger numbers of cations and anions were dissolved into the liquid product and reduced the surface tension. Preparing the liquid and solid products of HTD for coal water slurry (CWS) could recover the energy and get rid of wastewater effectively. The fixed-viscosity concentratio...