Effects of poplar addition on tar formation during the co-pyrolysis of fat coal and poplar at high temperature

Abstract

The effects of added poplar on the tar formed during the co-pyrolysis of poplar and fat coal at high temperature were discussed, and two stages were proposed to describe the mechanism of the effects based on the addition levels.

Strength degradation mechanism of iron coke prepared by mixed coal and Fe2O3

“…Gas chromatography mass spectrometer (QP2010Ultra, Shimadzu) was used to analyze changes of fluid phase transformation of mixed coal during thermoplastic stage after adding Fe2O3. The GC-MS characteristics were described in previous studies [31] and the fluid phase can be obtained from two-step solvent extraction (first acetone, then THF) [26]. Firstly, the sample from the pyrolysis experiment were placed in acetone, and the collected extracts were named as 400-light, 425-light, 450-light, 475-light and 500-light, respectively.…”

Relationships between Combustion Behavior in Air and the Chemical Structure of Bituminous Coal during Combustion Processes

“…After that, the coal's weight decreased noticeably because the coal started to experience volatile pyrolysis, which is the first step in bituminous coal combustion. During this step, oxygen-containing functional groups, alkyl side chains, or bridge bonds would break and release small molecular gas compounds, and some of them formed a fluid phase or tar [22,26,32]. When the combustion temperature reaches up to ignition temperature, these substances and char will combust.…”

“…This means that the weaker hydrocarbon-generating potential and longer aliphatic chain length of coal contribute to the larger activation energy of coal. When coal is heated initially during coal combustion processes, depolymerization reactions causes the rupture of weaker branched-chain bridges in the coal macromolecule, and this releases low hydrocarbon gases such as the methane, ethane, ethylene, and acetylene, and heavier molecules, such as fluid phase and coal tar [22,26,32]. Furthermore, these molecules can significantly affect coal combustion.…”

Co‐pyrolysis of coal‐biomass: study on reaction kinetics and thermodynamics

“…This is attributed to the presence of organic components in the biomass that influences the formation of alkene and reduces the aromaticity of the pyrolytic oil owing to free‐radical stabilization and cross‐linking reactions. Several works in the literature review the product yields when biomass is co‐pyrolyzed with coal; some of them shed light on its blending characteristics and devolatilization properties, and others on its kinetics 8,11,18,19 …”

“…Several works in the literature review the product yields when biomass is co-pyrolyzed with coal; some of them shed light on its blending characteristics and devolatilization properties, and others on its kinetics. 8,11,18,19 Thermogravimetric analysis (TGA) is a suitable technique to observe pyrolysis kinetics and thermodynamics. Various iso-conventional and non-iso-conventional integral methods have been brought to light in reviews of kinetic modeling studies.…”