Coliquefaction Reactivity of Biomass and Coal under Moderate Conditions. Part 2: Effect of Cornstalk Dosage on Viscosity of the Coliquefaction System

Abstract

The viscous characteristics of the liquefaction system play a crucial rule during liquefaction, and these characteristics of the coal oil slurry (COS) have been studied. In this paper, the viscosity of the coal biomass oil slurry (CBOS) at three stages while not systematically studied by forerunners was investigated by the torque current in the autoclave during coliquefaction of coals and cornstalk. The results, therefore, show that, at the thermal calefaction stage, the torque current of the CBOS system, predicted with the exponential decay model, was larger than that of the COS. At the pyrogenation and hydrogenation stage, the torque current of COS varies slightly in the Shengli coal system compared to the Shendong coal system, which presents a maximum. At the cooling stage, the torque current of the COS system, increasing with the quantity of the CS, was greater than that of the CBOS system. The study, thus, in the thesis indicates three aspects for industrial practices as well as fundamental research: the pumpablility of feedstock in the calefaction stage, the anticarbonization in the pyrogenation and hydrogenation stage, and the kinetic foundation in coliquefaction.