https://nova.newcastle.edu.au/vital/access/ /manager/Index ${session.getAttribute("locale")} 5 https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:47744 Wed 25 Jan 2023 15:49:54 AEDT ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:47150 Wed 14 Dec 2022 15:27:40 AEDT ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:50149 Wed 05 Jul 2023 14:11:46 AEST ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:34925 Wed 05 Aug 2020 13:27:19 AEST ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:38359 13C NMR) and X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), high-resolution transmission electron microscopy (HRTEM), and Raman spectroscopy. The carbon structure in coke generally is generally in the form of non-graphitic turbostratic structure, which exhibits isotropic property. There is a lack of information in terms of the 3D carbon structure model of coke/semi-coke and how these structures evolve from hydrocarbon sheets to more stable structures above 500 °C in the coke oven. This review also concludes future research scopes and the limitations of current knowledge.]]> Tue 31 Aug 2021 09:15:32 AEST ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:46699 Tue 29 Nov 2022 09:43:12 AEDT ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:38601 2- and sp³-bonded carbons. The results suggested that a dramatic chemical structure change took place during the stages following the plastic layers through to the coke/semi-coke regions. The chemical structure changes were strongly impacted by the properties of the parent coals. The carbon structure changes observed in XPS spectra were in good agreement with the aromatic ring condensation degree, which was indicated by the ratio of out-of-plane aromatic C-H to C=C bonds in aromatic rings. The results showed that the carbon structure evolution took place during the later stages of the thermoplastic ranges, forming the semi-coke.]]> Tue 27 Feb 2024 13:55:06 AEDT ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:34922 Tue 21 Mar 2023 16:12:47 AEDT ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:54357 Tue 20 Feb 2024 16:26:02 AEDT ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:40832 Tue 19 Jul 2022 10:47:22 AEST ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:46263 2 emissions per unit energy generation. They represent some of the primary and intermediate solutions to the world’s energy security. Extensive numerical modeling efforts have been undertaken over the past several decades, which have increased our understanding of the technical problems in HELE boilers, including combustion and boiler performance optimization, ash deposition, and material problems at higher operating temperatures and pressures. Overall, the differences in the physical and chemical models, boiler performance, and ash deposition of oxy-fuel combustion in HELE boilers that recirculate CO₂ and H₂O in the boilers are also discussed in comparison with the combustion of coal in the air. This Review comprehensively summarizes the current research on numerical modeling to offer a better understanding of the technical aspects and provides future research requirements of HELE coal-fired boilers, including boiler performance optimization, ash deposition, and material problems. The effects of changes in the configuration and operating conditions are discussed, focusing on the optimization of boiler performance in aspects such as unburnt carbon and NOx emissions. The paper also reviews the retrofit and optimization of operating conditions and the burner geometry with the low-NOx coal combustion technologies necessary to operate the HELE power plants. In terms of ash deposition, the development of submodels, including particle sticking and impacting behaviors and their effects on the deposit growth predictions under different temperatures, are discussed. Numerical models of the material oxidation and creep in the austenitic and nickel-based alloys generally used in HELE conditions have been developed using the finite element method to predict the availability of advanced alloys and creep life in the actual service time of the boiler parts. The predictions of oxide scale growth and exfoliation on the steam-side and fire-side and the creep strength are analyzed. The review also identifies some further research requirements in numerical modeling to achieve the optimization of coal combustion processes and address the technical problems in advanced HELE power plant operations.]]> Tue 15 Nov 2022 08:05:43 AEDT ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:47032 Tue 13 Dec 2022 14:08:31 AEDT ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:40076 Tue 05 Jul 2022 08:28:32 AEST ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:46994 Mon 29 Jan 2024 18:42:05 AEDT ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:50951 Mon 29 Jan 2024 18:24:44 AEDT ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:50228 Mon 10 Jul 2023 11:13:00 AEST ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:40192 Fri 29 Jul 2022 15:46:35 AEST ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:38450 Fri 17 Sep 2021 12:03:28 AEST ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:35458 Fri 16 Aug 2019 14:32:26 AEST ]]>