Results 101 to 110 of about 1,754,688 (187)

Pyrolysis Mechanism of Victorian Brown Coal Under Microwave and Conventional Conditions for Hydrogen-Rich Gas Production

Energies
Fast microwave pyrolysis technology can effectively convert brown coal into hydrogen-rich syngas. However, the unique pyrolysis behaviour of brown coal under microwave conditions is not fully understood in comparison with conventional pyrolysis.
Quan Sun, Salman Khoshk Rish, Jianglong Yu, Arash Tahmasebi   +3 more
doaj   +1 more source

Comparative study on pore structure evolution of conventional and microwave pyrolysis of tar-rich coal

Journal of Physics: Conference Series
Abstract To investigate the transformation of pore structures in tar-rich coal during conventional and microwave pyrolysis, systematic fixed-bed experiments are performed employing various techniques. The results indicate that at temperatures below 500 °C, all samples exhibited Type III isotherms with H3-type hysteresis loops.
Shuai Dong, Yongli Shi, Xiaole Huang, Xing Ning, Meijing Chen, Lei Deng, Chang’an Wang, Defu Che   +7 more
openaire   +1 more source

Numerical investigation of microwave-assisted pyrolysis of a tar-rich coal seam: an efficient and safe strategy with adjustable power heating

Case Studies in Thermal Engineering
Microwave heating has the advantages of no physical contact, high energy utilization rate, and rapid controllability. Firstly, a multi-physics field coupling model of electromagnetism, heat transfer, fluid flow and chemical reaction was established to ...
Hong Liu, Zibo Huang, Mingjie Li, Wenjing Zhou, Jinjia Wei   +4 more
doaj   +1 more source

Thermal transfer performance of downhole electric heaters for in-situ pyrolysis in tar-rich coal

Bulletin of the Polish Academy of Sciences Technical Sciences
The paper investigates the performance of a large-size helical baffle heater in an in-situ operation using a numerical simulation method. The study reveals that the fluid in the shell retains a spiral flow, and the output flow velocity is higher than in the surrounding area. However, the pitch design is big, resulting in a low-velocity flow zone on the
Ying Tang, Li Xiao, Fan Yang, Xiaodan Wu, Zhan Su, Yue Zhang, Shixin Jiang, Peng Yang   +7 more
openaire   +1 more source

Distributions of products from the pyrolysis of tar-rich coals for tar extraction in northern Shaanxi Province, China

Objective Tar-rich coals stand as a special type of coal resource that integrates coal, oil, and gas properties. These coals, boasting abundant hydrogen-rich structures such as side chains and bridge bonds with aliphatic structures, are prone to crack ...
Hongqiang, LI, Panxi, YANG, Wei, GUO, Zhiqiang, WU, Fu, YANG, Bolun, YANG, Li, MA, Kun, GAO, Zunyi, YU, Jing, WANG   +9 more
core   +1 more source

Molecular modeling of tar-rich coals from northern Shaanxi and their molecular dynamic characteristics in the process of pyrolysis for tar extraction

Objective The pyrolysis process and mechanism of tar-rich coals remain unclear due to their complex structures. Therefore, it is necessary to investigate the structure-activity relationship between their structure and the distributions of their pyrolytic
Hongqiang, LI, Panxi, YANG, Wei, GUO, Zhiqiang, WU, Fu, YANG, Bolun, YANG, Li, MA, Zunyi, YU, Jing, WANG   +8 more
core   +1 more source

Kinetics of the Catalytic Combustion of Coal Tar

, 2015
Coal tar combustion behavior was investigated in coexistence with ferric oxide and kaolin as catalysts. Thermogravimetry and differential thermal analysis experiments were performed using heating rates of 10, 20, and 30 degrees C/min.
Li, C., Zhang, S., Wang, H., Peng, Z.
core   +1 more source

Simulation of the pyrolysis process of tar-rich coals in an H\u3csub\u3e2\u3c/sub\u3eO atmosphere based on the reactive force field molecular dynamics

Objective Tar-rich coal resources, abundant in China, can be converted into energy products (e.g., chemicals and gas/liquid fuels) through pyrolysis, thus alleviating the country’s dependence on oil and gas imports.
Wenjing, ZHOU, Qianru, LIU, Hong, LIU, Zibo, HUANG, Jinjia, WEI   +4 more
core   +1 more source

Spatiotemporal distributions of typical contaminants from the in-situ pyrolysis of tar-rich coals

Objective and Methods Under high temperatures, oil and gas produced from the in situ pyrolysis of tar-rich coals will migrate toward and accumulate in the overburden strata after passing through the fracture zones on the coal seam roof, causing potential
Ruolin, ZHANG, Qianji, WANG, Lei, ZHANG, Lingru, ZHANG, Xiaoyu, WU, Siyuan, FANG, Hua, TIAN   +6 more
core   +1 more source

Impacts of the caking property of tar-rich coals on their pore structure evolution and seepage during pyrolysis

Objective The in-situ pyrolysis of tar-rich coals stands as a technique whereby coal seams are heated underground to produce tar and gas products. During the in-situ pyrolysis, the injection of heating media and the production of tar and gas are affected
Xiaodan, WU, Chuchu, WANG, Wenhao, KUANG, Shuqin, LIU, Zhibing, CHANG, Ying, TANG   +5 more
core   +1 more source