A TGA Investigation to Co‐Pyrolysis Characteristics of Shenhua Direct Coal Liquefaction Residue and Huolinhe Lignite and the CO₂ Gasification Behavior of the Derived Char

Abstract

Co-pyrolysis of direct coal liquefaction residue (DCLR) and low rank coals was regarded as reliable and efficient method to process DCLR. The treatment of the derived co-pyrolysis char is important for the comprehensive utilization of DCLR. In this study, the non-isothermal co-pyrolysis of Shenhua DCLR and Huolinhe lignite, and the isothermal CO 2 gasification of the copyrolysis char were performed by the thermogravimetric analysis method. The interactive effect of co-pyrolysis and the CO 2 gasification behavior of the derived char were explored by comparing the experimental and calculated thermogravimetric/derivative thermogravimetric (TG/DTG) curves and reactivity-conversion (R-x) curves, respectively. The results show that the devolatilization pattern at 200-600°C was modified and part of volatiles were released in advance. As the experimental co-pyrolysis T max was lower by 7-13°C than the calculated value, while it was almost equal to the T max of lignite pyrolysis. We tentatively concluded that lignite devolatilization could promote the evaporation of molten components of DCLR. Moreover, DCLR and lignite could polymerize or condensation with each other at 650-900°C. The lignite char within copyrolysis char could support the char skeleton and hold a high porosity. Therefore, the CO 2 gasification reactivity of co-pyroysis char was promoted and the experimental reactivity exceeded the calculated value over the conversion range of 12-90 %.

[Retracted] Experiment and Algorithm Research of Coal Direct Liquefaction Residual Oil Pyrolysis and Coking Technology Based on Lumped Kinetic Engineering

“…Direct coal liquefaction residual oil pyrolysis and coking technology, as a coal-to-liquid process, effectively provide important technical support for ensuring our country's energy supply and safety, alleviating our country's shortage of petroleum resources and other prominent and sensitive issues [1,2]. However, the existing coal rapid pyrolysis and coking process still faces problems such as low coal utilization, poor tar quality, and reprocessing pyrolysis of the liquefied residue generated at the end of the hydrolysis process [3,4]. e research on the experiment and algorithm of coal direct liquefaction residual oil pyrolysis and coking technology based on lumped kinetic engineering will help to provide a new solution to this type of problem [5,6].…”

Valuable Biofuel Production via Pyrolysis Process of Olive Pomace over Alkali and Transition Metal Oxides Catalysts Supported on Activated Biochar

“…During combustion and gasification processes, the chemical reactions take place in the presence of oxygen, [10,17,18] but during pyrolysis, the reactions occur in the absence of oxygen [19,20] . In gasification and pyrolysis methods, main products are in the gas and liquid phases, respectively [17,19,21–23] …”

“…[19,20] In gasification and pyrolysis methods, main products are in the gas and liquid phases, respectively. [17,19,[21][22][23] Pyrolysis products can be divided into three groups: biogas, biochar and bio-oil. Bio-gas and biochar are by-products of the pyrolysis process.…”