WEBJan 15, 2020 · article{Zhou2020EffectOF, title={Effect of functional groups on volatile evolution in coal pyrolysis process with insitu pyrolysis photoionization timeofflight mass spectrometry}, author={Yang Zhou and Lu Li and Lijun Jin and Jialong Zhu and Jiangang Li and Yang Li and Hongjun Fan and Haoquan Hu}, journal={Fuel}, .
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WEBMar 31, 2022 · An inherent watersoluble sodiumloaded coal sample was prepared using crown ether for this study. The pyrolysis process of an inherent watersoluble sodiumloaded coal sample and a watersoluble sodium compoundloaded coal sample was researched by thermogravimetric analysis (TGA). Also, the pyrolysis kinetics of the .
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WEBJul 5, 2017 · Pyrolysis, especially pyrolysis of coal, is an age‐long activity but biomass pyrolysis is a completely new entrant. The process is aimed to produce biofuel. In the garret process, solid waste (Biomass) is allowed to mix with hot char and hot recycle gas in a specially designed chamber.
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WEBJan 2, 2024 · Coal pyrolysis is a complex process involving the thermal decomposition of coal in the absence of oxygen to produce a range of gases, liquids, and solids. The process is influenced by several factors, including heating rate, temperature, pressure, and residence time. At the high temperature and pressure conditions, the reaction kinetics .
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WEBJun 15, 2020 · In coal pyrolysis process, the drying and pyrolysis units are simulated by the RYIELD reactor module [35]. The temperature and pressure of drying unit are set as 350 °C and MPa, respectively. Dry coal is obtained by removing most of water through SEP1 module. After pyrolysis unit, which temperature and pressure are set as 630 °C .
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WEBDec 1, 2023 · In the process of coal mining, washing and utilization, a huge amount of coal gangue (CG) is produced, which has become the largest solid waste in China. ... [14] et al. discussed the influence of alkali metal compounds on the pyrolysis process of CG, and the results showed that high alkali metal content could reduce the initial precipitation ...
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WEBFeb 1, 2013 · The amount of volatile fractions (distillate below 300 °C) of tar obtained from coal pyrolysis under different atmospheres is different and the results are shown in Table can be seen that the percentage of distillate for coal tar under N 2, H 2 and CO 2 atmospheres is about 70% to total tar, and that from CRMP process is %, much .
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WEBAug 1, 2023 · The thermal transportation of pulverized semicoke is a critical link of pulverized coal pyrolysis and downstream appliion technology. In this work, the semicoke powder stably produced in an industrial test device was used as the raw material, and the properties and influencing factors during thermal transportation process were .
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WEBIn order to investigate the multiple reactions involved in the pyrolysis process of lignite, the multipeak fitting simulation of the yield curves of H 2, CO, CO 2 and CH 4 produced by the pyrolysis of lignite under the Ar atmosphere was carried out by using the Origin 2021 software and the peak finding method was set to 2nd Derivative because ...
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WEBApr 5, 2024 · In order to explore the formation mechanism of NOx precursors and NOx during coal pyrolysis and combustion, four typical Ncontaining functional groups in coal, including pyridineN (N6), pyrroleN (N5), protonationN (NQ) and oxidized pyridineN (NX), were taken for study. Firstly, the thermal reaction processes of Ncontaining .
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WEBJan 1, 1989 · INTRODUCTION A coal pyrolysis process has been developed for the purpose of producing chemical feedstocks such as benzene, toluene, xylene (BTX) and light oil which have high economic values. The yields of products are influenced by many factors (coal type, coal particle size, carrier gas, pressure, temperature and so on ). ...
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WEBMar 23, 2023 · The coal pyrolysis is a fundamentally important process since it involves a set of chemical reactions, which play key roles in most coal conversion processes, such as coking, liquefaction, hydrogenation, gasifiion and combustion. ... Coal softening is a consequence of both physical melting process and pyrolysis breakdown of the coal .
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WEBMar 1, 2024 · To characterize the pyrolysis process of Zhundong coal, an updated version [50] of the CRECKS model [55] from Politecnico di Milano (PoliMi) was successfully employed. Detailed information about the CRECKS model is available in Refs. [50, 56].This CRECKS model extended for Zhundong coal comprises 23 species and 43 reactions .
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WEBApr 1, 2020 · An experimental investigation on heating rate effect in the thermal behavior of perhydrous bituminous coal during pyrolysis. Perhydrous bituminous coal has multipurpose industrial appliions established by its distinctive thermal behavior. The Huainan coalfield in China has a large volume of these types of coals...
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WEBSep 6, 2011 · The pyrolysis process of the coal is comprised of two stages. At the primary stage(t < 560 °C), the pyrolysis reaction is dominated by the diffusion rate of volatile matter because of the high ash content, which is the global symmetry diffusion mechanism, and the volatile matter of this stage is more difficult to come out and a high pyrolysis ...
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WEBJul 20, 2023 · Lowrank coal (LRC) pyrolysis assisted by biomass can realize the clean and efficient conversion utilization of LRC. The gas and tar characteristics obtained fr ... of apple branch (AB) and LRC at different stages were studied with TGFTIR and PyGC/MS. It was found that the copyrolysis process could be divided into four stages, and the .
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WEBMar 1, 2020 · The pyrolysis processes of a coal particle containing 19,638 atoms in different atmospheres are studied with a reactive force field molecular dynamics (ReaxFF MD) method. The detailed chemical reactions with the corresponding occurrence frequencies are obtained. The generation paths of the main products are disclosed, .
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WEBDec 15, 2023 · During coal pyrolysis, the heating and quenching procedures were iterated five times within a duration of 1000 ps. ... Integrated process of coal pyrolysis with steam reforming of ethane for improving the tar yield. Energy Fuel, 32 .
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WEBMar 5, 2024 · Char was prepared in a fixed bed reactor by pyrolysis of coal. The experimental process was as follows: about 2 g of coal was placed in a molybdenum crucible in reactor; N 2 (300 mL·min −1) was injected into reactor to purge air, and power controller was adjusted to heat the reaction zone to 1000 °C; reaction zone was kept at .
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WEBJan 15, 2020 · Therefore, understanding the specific effects of functional groups is of great significance for the further study of coal pyrolysis process. However, the lack of direct online observation and indepth mechanistic analysis on the influence of functional groups during the pyrolysis process lead to the difficulty in unified understanding on the ...
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WEBOct 1, 2022 · Deng studied the pressurized pyrolysis process of demineralized coal at 1000 °C and found that as the pyrolysis pressure increased from MPa to MPa, the char yield increased from % to %, which was attributed to the increase of external pressure, the pressure difference between internal and external pores of coal ...
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WEBAiming at the optimization of the dust removal process in the polygeneration system of circulating fluidized bed (CFB) combustion/coal pyrolysis, a granular bed filter (GBF) is applied to the coal pyrolysis by solid heat carrier. By carrying out labscale experiments with a movingbed pyrolyzer, the GBF model proposed by C. Tien et al. was used to .
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WEBAug 15, 2022 · (1), where m 0, m t were the initial mass of coal and the mass at a given time during the pyrolysis process, respectively. And m ∞ was the final mass of coal sample when the pyrolysis process was completed. (1) α = m 0m t m 0m ∞. The heating rate β was defined as Eq. (2). (2) β = d T d t
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WEBNov 1, 2019 · The integrated process involves two processes: alytic reforming of SCG and coal pyrolysis. The existence of reforming alyst (Ni/Al 2 O 3) can alyze some reactions, thus, the atmosphere difference will affect the reforming process and the subsequent coal pyrolysis process. Our previous studies also showed that some .
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WEBNov 6, 2021 · Therefore, during the slow pyrolysis process, even if the main pyrolysis stages of coal and biomass are independent of each other, there are still synergistic or inhibitory effects. During copyrolysis, when the heating rate is fast enough, the pyrolysis processes of coal and biomass can occur simultaneously, and the release of volatiles .
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