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  • Ndebele (South Africa)  (4)
  • 1
    Online Resource
    Online Resource
    Exergy and energy analysis on coal/biomass co-gasification in supercritical water
    Old City Publishing, Inc ; 2021
    In:  High Temperatures-High Pressures Vol. 50, No. 1 ( 2021), p. 3-15
    Details
    In: High Temperatures-High Pressures, Old City Publishing, Inc, Vol. 50, No. 1 ( 2021), p. 3-15
    Abstract: Supercritical water gasification (SCWG) is a promising technology for clean and efficient utilization of carbonaceous organic materials at high temperature and pressure. Coal/biomass co-gasification in supercritical water (SCW) is a better choice for both coal and biomass to offset their disadvantages. Therefore, based on the experimental results of coal/carboxymethylcellulose (CMC, as a model compound of biomass) co-gasification in SCW by continuous flow thermal-catalytic reaction system at a reactor wall temperature of 650 �C, pressure of 25 MPa, a residence time 30 s and 0.1 wt% NaOH additive, the effects of heat transfer efficiency, heat supply methods, and CMC fraction on exergy and energy efficiency of reactor (the core device in reaction system) were investigated. The results show that energy and exergy efficiencies are in excess of 69% and 43%, respectively. The priority order of heat supply for the reactor is as follow: lower temperature heat source 〉 higher temperature heat source 〉 direct electricity heat supply method. The heat transfer efficiency has great influence on the energy and exergy efficiencies in terms of thermophysics. The higher CMC fraction is helpful to improve exergy efficiency.
    Type of Medium: Online Resource
    ISSN: 1472-3441
    URL: Article
    DOI: 10.32908/hthp.v50.927
    Language: Ndebele (South Africa)
    Publisher: Old City Publishing, Inc
    Publication Date: 2021
    detail.hit.zdb_id: 2022638-X
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  • 2
    Online Resource
    Online Resource
    Relationship of the atomic dynamics and excess volume of a copper rich Cu76Ti24 alloy melt
    Old City Publishing, Inc ; 2023
    In:  High Temperatures-High Pressures Vol. 52, No. 2 ( 2023), p. 165-173
    Details
    In: High Temperatures-High Pressures, Old City Publishing, Inc, Vol. 52, No. 2 ( 2023), p. 165-173
    Abstract: We investigate the atomic dynamics of a Cu-rich Cu76Ti24 alloy between 1223 K and 1453 K using the quasi-elastic neutron scattering technique. The obtained mean Cu/Ti self-diffusion coefficient D exhibits an Arrhenius-like temperature dependence with an activation energy of 0.46�0.02 eV per atom. Compared with those of the pure elements at a given temperature, D is slower than that for pure Cu, but similar to pure Ti. This slowing down of the liquid dynamics upon alloying has been observed for most binary alloy systems. However, in this study, the packing fraction of the Cu-Ti alloy is lower than that of the pure elements, which can be explained by the positive excess volume of the Cu-Ti system. Therefore, the compositional dependence of the atomic dynamics cannot be linked to a macroscopic packing argument. Only, the atomic dynamics is not correlated with an increase of the average packing fraction of the melt.
    Type of Medium: Online Resource
    ISSN: 1472-3441
    URL: Article
    DOI: 10.32908/hthp.v52.1353
    Language: Ndebele (South Africa)
    Publisher: Old City Publishing, Inc
    Publication Date: 2023
    detail.hit.zdb_id: 2022638-X
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  • 3
    Online Resource
    Online Resource
    The preparation and performance study on composite phase change materials of lauric acid-palmitic acid-tetradecyl alcohol/expanded perlite for thermal energy storage
    Old City Publishing, Inc ; 2020
    In:  High Temperatures-High Pressures Vol. 49, No. 5-6 ( 2020), p. 497-507
    Details
    In: High Temperatures-High Pressures, Old City Publishing, Inc, Vol. 49, No. 5-6 ( 2020), p. 497-507
    Abstract: In order to obtain phase change materials (PCMs) suitable for building energy conservation, ternary organic phase change materials were studied. According to the second law of thermodynamics and the theory of phase equilibrium, the phase change temperature and latent heat value of the ternary mixture with different proportions was calculated. The results show that the phase change temperature of lauric acid-palmitic acid-tetradecyl alcohol mixture with a mass ratio of 46:5:49 was calculated to be 25.1 �C, the latent heat value is 186 J/g, which was well consistent with the measured 24.8 �C and 165 J/g, and is in the desired temperature range of 25�30 �C for building phase change materials. Furthermore, a new material of lauric acid-palmitic acid-tetradecyl alcohol/expanded perlite was prepared by using a dry expanded perlite (EP) with a particle size of 0.9~2.5 mm as the adsorption carrier, and the optimum proportion of the lauric acid-palmitic acid-tetradecyl alcohol mixture was uniformly adsorbed into the EP by prevailing pressure adsorption method. Lastly, the effects of adsorption temperature and adsorption time on the retention rate were studied.
    Type of Medium: Online Resource
    ISSN: 1472-3441
    URL: Article
    DOI: 10.32908/hthp.v49.965
    Language: Ndebele (South Africa)
    Publisher: Old City Publishing, Inc
    Publication Date: 2020
    detail.hit.zdb_id: 2022638-X
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  • 4
    Online Resource
    Online Resource
    A thermodynamic analysis of optimization schemes for a heat-power cogeneration system
    Old City Publishing, Inc ; 2020
    In:  High Temperatures-High Pressures Vol. 49, No. 5-6 ( 2020), p. 369-381
    Details
    In: High Temperatures-High Pressures, Old City Publishing, Inc, Vol. 49, No. 5-6 ( 2020), p. 369-381
    Abstract: To overcome the strong thermoelectric coupling in a coal-fired combined heat and power plant (CCHPT), three optimization schemes are investigated. These include low-pressure turbine little steam operation (LLPEH), extracting steam from high pressure turbine (HP-LPEH), and integrating the LLPEH and HP-LPEH (HP-LLPEH). These are employed for enhancing the plant�s heat and electricity supply flexibility using steam extracted between the intermediate- and low-pressure turbines to provide heat (LPEH). The thermodynamic and economic performance of the schemes when applied to a 330MW coal-fired combined heat and power plant were evaluated and compared. The comparison reveals the highest heat supply capacity, highest heat to electricity ratio, and lowest standard coal consumption for the HP-LLPEH scheme, while the LPEH exhibits the highest thermal efficiency.
    Type of Medium: Online Resource
    ISSN: 1472-3441
    URL: Article
    DOI: 10.32908/hthp.v49.913
    Language: Ndebele (South Africa)
    Publisher: Old City Publishing, Inc
    Publication Date: 2020
    detail.hit.zdb_id: 2022638-X
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