Browsing by Author "Jeswani, Harish"

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    Blue hydrogen production through partial oxidation: a techno‐economic and life cycle assessment
    (Wiley, 2024) Khallaghi, Navid; Ghiami, Shamsoddin; Jeswani, Harish; Nabavi, Seyed Ali; Anthony, Edward J; Klyamkin, Semen
    Partial oxidation (POx) as a hydrogen production method has not received comprehensive exploration as the resulting syngas has a relatively low H2/CO ratio compared to established techniques like steam methane reforming (SMR). As a result, this study aims to comprehensively investigate the feasibility of a low‐carbon hydrogen production process using POx from both technical‐economic and environmental standpoints. To achieve this, the Aspen Plus® software is employed to model a hydrogen production plant with carbon capture integration, referred to as POx‐CCS (carbon capture and storage). The research reveals that the overall energy efficiency of the POx‐CCS process is around 73%. Moreover, the economic evaluation indicates that the levelised cost of hydrogen (LCOH) is €1.8/ kgH2, given a fuel price of €5.7 per GJ. This cost competitiveness positions POx‐CCS in line with conventional hydrogen production methods. From an environmental perspective, the impact of climate change on hydrogen production through the POx‐CCS process is assessed to be 1.1 kg CO2 eq./kgH2. This impact is reduced by 69% compared to SMR with CCS.
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    Techno-economic-environmental assessment of biomass oxy-gasification staged oxy-combustion for negative emission combined heat and power
    (Elsevier, 2021-06-23) Khallaghi, Navid; Jeswani, Harish; Hanak, Dawid P.; Manovic, Vasilije
    Climate change mitigation requires developing low-carbon technologies capable of achieving CO2 emission reductions at the gigatonne scale and affordable cost. Biomass gasification, coupled with carbon capture and storage, offers a direction to atmospheric CO2 removal. To compensate for the issues associate with the high-investment requirement of CO2 removal unit and lower efficiency compared to fossil-based power cycles, this study proposed a conceptual system for combined heat and power, based on biomass oxy-gasification integrated with staged oxy-combustion combined cycle (BOXS-CC). Aspen Plus® is used to develop the process model of the proposed cycle. The results obtained in the techno-economic analysis showed that the net power efficiency of the proposed concept with 50.2 kg/s biomass flowrate was 41.6%, and the heat efficiency was 27.4%, leading to a total efficiency of 69.0%, including CO2 compression. Moreover, the economic assessment of BOXS-CC revealed that it can achieve a levelised cost of electricity of €21.4/MWh, considering the heat and carbon prices of €46.5/MWh and €40/tCO2, respectively. Such economic performance is superior compared to fossil fuel power plants without CO2 capture. The environmental assessment shows that BOX-CC system results in net negative emissions of 766 kg CO2 eq./MWhe