1. Introduction Pyrolysis is an effective and mild coal conversion process. The polygeneration technology based on coal pyrolysis can produce many valuable products such as highcalorific pyrolysis gas, upgraded coal tar, and clean solid fuel char or coke, which will realize multilevel efficient utilization of coal resources. 1,2 The products of coal pyrolysis are affected by various factors ...
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Pyrolysis, which is the initial stage of the coal conversion process, is a significant approach to realize efficient coal resource utilization. Current research on the mechanism of the coal pyrolysis reaction primarily focuses on aspects such as the generation law of pyrolysis products [6], evolution characteristics of the chemical structure ...
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The pyrolysis of coal is a good method for producing liquid fuels and other chemicals; however, the yields of these products are limited due to low content of hydrogen in coal. Hydropyrolysis, a pyrolysis process under hydrogen, is an effective method to improve tar yield and quality, but high cost of pure hydrogen hinders its industrial ...
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The breaking of chemical bonds is the fundamental process in pyrolysis. Coal pyrolysis is the first step in coal gasification and other chemical processes, and is the basic process in clean coal technologies. Coal pyrolysis is closely related to coal composition and structure. The molecular structure of coal can be clarified based on pyrolysis ...
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Therefore, proper pyrolysis mechanism model can optimize the copyrolysis process to reflect the actual copyrolysis interactions. This work is aimed to detect the primary volatiles from pyrolysis of lowrank coal and waste plastics using insitu PyTOFMS and to further reveal the interactions between coal and plastics based on the primary ...
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The heterogeneous nature of coal and the complexity of the pyrolysis process have made it very difficult to perform unambiguous experiments to determine the rates and mechanisms in coal pyrolysis. However, recent years have seen a number of new experimental and theoretical approaches which shed new light on the subject. This paper considers the recent progress on kinetics, the formation of ...
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However, in terms of process economy, the required capital cost for highpressure equipment in the liquefaction process makes it less attractive for the industries and persuades them to develop fast pyrolysis for biooil production [6, 128, 136, 137, 142, 143]. It is worth mentioning that the biooil per se is a low value energy carrier.
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Thermocatalytic pyrolysis of waste packaging plastic was investigated in a semi batch reactor. Spent aluminum hydroxide nanoparticle derived from the electrocoagulation of arsenic and fluoride containing synthetic ground water was developed into catalyst through combined thermal treatment and metal impregnation process. Nickel, iron, zinc, copper, and molybdenum were separately doped on the ...
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Coal pyrolysis is generally performed in atmospheres without oxygen and at temperatures below 650 °C for producing pyrolysis liquid and gas. To support the development of a new twostage gasification process integrating a fluidizedbed pyrolyzer and a downdraft fixedbed gasifier, this paper investigated the coal pyrolysis in atmospheres containing oxygen and steam and at temperatures up to ...
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When the temperature exceeds 3250 K, the pyrolysis reaction was completed and the yield of each product stabilizes. The lower heating rate completely reproduces the pyrolysis process of coal, and the pyrolysis stages obtained by simulation are close to Fugu subbituminous coal [57]. At 10 K/ps, the content of char is the least and Ltar is the ...
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Also, we investigate the catalytic activity of the catalysts in coal pyrolysis process. 2 Methodology and Experiments. Preparation of NiCo Ternary Molten Salt Crystal Catalysts. The molten salt crystal synthesis method has been proposed by Rockwell International Corporation in 1965 . And it is an efficient method for the preparation of ...
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Production of synthetic crude oil from coal using the Toscoal pyrolysis process. Conference Cortez, D; LaDelfa, C Proc., Intersoc. Energy Convers. Eng. Conf.; (United States) This paper presents the results of a recent feasibility study of the Toscoal process for recovering oil and gas from coal prior to combustion in power plants. Conceptual ...
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The complexity of coal combustion has made more researchers divide the combustion process into two stages: pyrolysis and late combustion. Up to now, many studies have been done on transformation behavior of nitrogen during coal pyrolysis [16], [17] and occurrence state and content of nitrogen in coal [18] .
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This technology builds upon decades of experience with gasification of coal. Both approaches have the potential advantages of being relatively insensitive to feedstock type, both suffer from production of unwanted byproducts. ... Slow pyrolysis is a conventional pyrolysis process whereby the heating rate is kept slow (approximately oC/s ...
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It can be seen from Fig. 11 that the tar yield is improved after adding Group VIII metal oxide catalyst in the coal pyrolysis process; Cr 2 O 3 /γAl 2 O 3 makes the tar yield the highest at ...
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The coalbased pyrolysis process faces so many challenges based on the production and consumption and also the limited resources, low efficiency and higher emissions. Biological origin. There has been a lot of studies on the feedstocks of biological origin used in microwave pyrolysis. Biological origin here refers to the feedstock having a ...
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N 2 is an important nitrogencontaining product in the process of coal pyrolysis, and understanding its formation mechanism is crucial to control NO x emissions in coal combustion. In this paper, the pyrrolepyridine dinitrogen structure and dipyridine nitrogen structure were selected as the carbonaceous surfaces to investigate effect of different nitrogen forms on N 2 production.
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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, gasification and combustion. ... Coal softening is a consequence of both physical melting process and pyrolysis breakdown of the coal matrix ...
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For the coal pyrolysis process, unstable sulfur compounds will decompose, generate sulfur radicals and release as sulfurcontaining gases, this becomes the main pathway for sulfur removal. Coal properties, minerals and sulfur forms in coal, and pyrolysis conditions such as temperature, atmosphere, and the mass transfer, are the main factors ...
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The pyrolysis characteristics of Shenmu coal under an atmosphere containing H2 (40%) and another containing CH4 (40%) were studied via a thermogravimetric analysis, and the kinetic parameters of pyrolysis were calculated by using a distributed activation energy model (DAEM). The results showed that H2 promoted the cleavage of CHlike functional groups by providing reactive hydrogen groups to ...
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In order to further reveal the thermochemical reaction characteristics in the pyrolysis process, the changes of chemical structures of coal during the coking process from room temperature to 520 °C was studied through insitu FTIR, and the results are shown in Figure 5. There are a lot of aromatic structures in the four coking coals, and the ...
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INTRODUCTION. Pyrolysis is the key process in carbon nanomaterial synthesis [], bulk carbon production [5, 6], fabrication of carbonbased devices [], fuel generation from organic waste [] and molecule fragmentation for their analysis via gas chromatographymass spectroscopy (GCMS) [].Primary examples of the technologically significant carbon materials prepared via pyrolysis include ...
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Pyrolysis process. Pyrolysis properties of a coal sample were evaluated using TGA. In this study, all TGA experiments initiated at 30 °C, not 300 °C. This decision was supported and validated through multiple experimental runs, ensuring the mass loss monitoring was as accurate as possible. This study's primary emphasis is on the processes ...
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Pyrolysis is an effective and mild coal conversion process. The polygeneration technology based on coal pyrolysis can produce many valuable products such as highcalori c pyrolysis gas, upgraded coal tar, and clean solid fuel char or coke, which will realize multilevel efficient utilization of coal,2 The
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Pyrolysis is a thermochemical treatment of any organic (carbon based) product at particular temperatures range in the absence of oxygen. The study of pyrolysis includes the changes in chemical composition and characteristics of physical phase (Buratti et al. 2015).This process includes the decomposition of coal's organic structure and the releases of volatile matter up to 70% weight loss.
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Depolymerization of coal increases the tar yield in coal pyrolysis and enhances the thermoplasticity of the coal, which makes coal more favorable for producing coke and other valueadded products like graphite electrodes, carbon fiber, aromatic chemicals, etc. In this study, the authors have proposed a novel coal depolymerization method that combines the oxidation reactions by molecular oxygen ...
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The crushed coal particles with the size of 12 mm were selected as feedstock. The results of the proximate analysis and the ultimate analysis of bituminous coal are shown in Table N 2 gas and the simulated fuel gas were used as fluidizing gas. According to previous research results (Ni et al., 2014), the main components of the fuel gas released from the coal pyrolysis in the fluidized ...
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Pyrolysis polygeneration technology is a good way to realize clean and efficient utilization of lowrank coal and heat carrier is a key factor. Aspen Plus is used to establish lowrank coal pyrolysis staged conversion polygeneration technology with semicoke heat carrier based on dualfluidized bed (CPSCPCDFB), which couples with ultrasupercritical semicoke powder furnace for power generation.
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