Experimental study of laser pyrolysis of coal and residual oil

Li, Yue; Fang, Hua; An, Hang; Cheng, Yi

doi:10.1016/j.fuel.2020.119290

Cited by 10 publications

(8 citation statements)

References 28 publications

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“…Coal pyrolysis is a complex process in which a series of physical and chemical reactions occur at different temperatures when coal is heated in isolated air or inert atmosphere. Its reaction is very rapid, producing gas(The gases are mainly low molecular compounds such as CH 4 , H 2 and CO), liquid and solid products, generally starting at 300°C and ending at 900°C (Wiatowski et al 2016, Peng et al 2016, Li et al 2021, Chmielniak et al 2021). The increase of temperature, volatile decomposition and intermolecular fracture during pyrolysis will change the pore structure and permeability of coal (Self et al 2012, Bhaskaran et al 2015, Meng et al 2020, Yu et al 2021, Wang et al 2021), it will not only affect the escape of gas in the pyrolysis process, but also affect the transportation of gasifying agent in the subsequent gasification process.…”

Section: Introductionmentioning

confidence: 99%

Pyrolysis characteristics and microstructure evolution of different coal types

Chen

Yin

Sun

et al. 2022

Energy Exploration & Exploitation

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Coal pyrolysis is the basis of coal gasification, as it is the necessary reaction step in the coal conversion process. To study the pyrolysis characteristics of different coal grades under temperature, thermal simulation tests of three different ranks of coal were conducted, and the pore structure and gas products were analyzed by using liquid nitrogen adsorption and gas chromatographic, and perform fractal fitting for pores of different size. The results show that the pyrolysis gas output of Inner Mongolia lignite is higher than that of Xinjiang long flame coal and Hancheng bituminous coal. With the increase of coal rank, the gas output of each gas component also shows a decreasing trend and the initial temperature and peak temperature of various gases gradually shift to high temperature. With the increase of temperature, the average pore size, volume, specific surface area, and fractal dimension of the three kinds of coal char show an increasing trend. The average pore size and pore volume of coal char increase, and the fractal dimension increase with the increase of coal rank. The comprehensive comparative analysis of the gaseous products, average pore size, pore volume, and fractal dimension of the three coal chars shows that Inner Mongolia lignite has high gas production, large average pore size, good connectivity, and simple pore structure, which is conducive to the escape of pyrolysis gas and the transportation of gasification agent and is the best favorable coal for gasification. The research results are expected to provide experimental guidance for the actual production of underground coal gasification.

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Section: Introductionmentioning

confidence: 99%

Pyrolysis characteristics and microstructure evolution of different coal types

Chen

Yin

Sun

et al. 2022

Energy Exploration & Exploitation

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“…This explains why thermal pyrolysis in plasma offers a green and environmentally friendly approach to produce acetylene from the low-grade residual oil. [30] The feasibility of producing acetylene in thermal plasma is mainly dependent on the thermodynamic properties [31,32] of the material at temperatures higher than 1500 K. Specifically, when the temperature of the reaction system is raised to such a high level, acetylene is found to be the most stable hydrocarbon among the species in the gas phase, and it will become the primary gas component of the reaction system. [32] Thermal plasma reactors enable high temperatures up to $10 000 K in the core area in comparison with conventional reactors, as well as an intense heat transfer rate.…”

Section: Introductionmentioning

confidence: 99%

“…However, the reported data have indicated that the pyrolysis performance greatly depends on the material type. [31,32,[38][39][40] The present work focuses on the plasma pyrolysis of residual oils, that is, by-products from the refining process of heavy oils, including fluid catalytic cracking (FCC) slurry oil produced in the catalytic cracking process, de-oiled asphalt (DOA) [30] produced in the solvent de-asphalting process, and slurry-bed hydrocracking bottom oil (SHBO). [30] The laboratory-scale experiments are carried out to establish the fundamental knowledge to verify the feasibility of the application of thermal plasma pyrolysis to convert the residual oil to value-added light gases.…”

Section: Introductionmentioning

confidence: 99%

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Direct conversion of poor‐quality residual oil to light gases in electricity‐driven thermal plasma reactor

Ali

Cheng

et al. 2022

Can J Chem Eng

Self Cite

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Nowadays, the utilization of non‐conventional oil resources has become an increasingly attractive solution for producing valuable chemicals and materials due to the depletion of conventional oil resources. Plasma technology, powered by renewable energy sources, provides a potential way to convert low‐grade residual oil into lighter hydrocarbons in an environmentally friendly fashion. This study has developed a laboratory‐scale plasma pyrolysis system to investigate the impacts of residual oil characteristics and operating variables such as residual oil‐specific enthalpy, arc gas flow rate, arc gas composition, quenching, and plasma configuration. The results show that the higher specific enthalpy of the residual oil leads to higher yields of C1, C2, and H2, particularly C2H2. An increment in the arc gas flow rate improves the pyrolysis impact; however, an excessively high arc gas flow rate lowers the thermal plasma jet's temperature, causing a limited pyrolysis effect. In the composition of arc gas, the increasing concentration of H2 can enhance the specific enthalpy and improve carbon conversion from residual oil to gas products, both of which result in a higher yield of light gases. Furthermore, ethane gas has been used as a quenching medium after plasma pyrolysis. The results reveal that ethane can be cracked into ethylene and other products by taking full use of the heat energy of the gas. Meanwhile, the sharp decrease in the gas temperature inhibits the further pyrolysis of the main valuable products.

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“…Owing to the advantages of collimation, noncontact, and fast heating rate, laser would be suitable for the pyrolysis study of oil shale, which will help to promote our understanding of the pyrolysis process and provide an alternative, efficient, and reliable method to evaluate the oil shale . Compared with the traditional high-temperature pyrolysis process, the laser pyrolysis process can produce a gas richer in C 2 H 2 , CO, and HCN. − …”

Section: Introductionmentioning

confidence: 99%

Mechanism of the Laser-Induced Voltage Generated in Oil Shale under the Irradiation of a 532 nm Laser

et al. 2021

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The laser-induced voltage (LIV) method has been used to characterize the oil shale directly. Explaining the generation mechanism and the response process of oil shale is expected to provide a basis for the real-time monitoring of its pyrolysis process. Here, we focused on the generation process of LIV in oil shale under the irradiation of a 532 nm laser. The influence of bias voltage and laser power on the LIV response of oil shale is studied and discussed. The LIV response strongly depends upon the laser power and exhibits an increasing trend as the laser power increases from 0.157 to 0.237 W. With the increasing temperature as a result of laser illumination, the spontaneous electric polarization results in the variation of the surface charge and the associated flow of a thermoelectric current. In addition, the current signal nonlinearly increases with an increase in the bias voltage, which has a similar form as that of the classical thermionic emission transport relationship.

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Experimental study of laser pyrolysis of coal and residual oil

Cited by 10 publications

References 28 publications

Pyrolysis characteristics and microstructure evolution of different coal types

Pyrolysis characteristics and microstructure evolution of different coal types

Direct conversion of poor‐quality residual oil to light gases in electricity‐driven thermal plasma reactor

Mechanism of the Laser-Induced Voltage Generated in Oil Shale under the Irradiation of a 532 nm Laser

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