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  • 51.
    Salman, Chaudhary Awais
    et al.
    Mälardalen University, School of Business, Society and Engineering, Future Energy Center.
    Naqvi, Muhammad
    Mälardalen University, School of Business, Society and Engineering, Future Energy Center.
    Thorin, Eva
    Mälardalen University, School of Business, Society and Engineering, Future Energy Center.
    Yan, Jinyue
    Mälardalen University, School of Business, Society and Engineering, Future Energy Center.
    Impact of retrofitting existing combined heat and power plant with polygeneration of biomethane: A comparative techno-economic analysis of integrating different gasifiers2017In: Energy Conversion and Management, ISSN 0196-8904, E-ISSN 1879-2227, Vol. 152, p. 250-265Article in journal (Refereed)
    Abstract [en]

    It is vital to identify and evaluate the optimal gasifier configuration that could be integrated with existing or new combined heat and power (CHP) plants to maximize the utilization of boiler operating capacity during off-peak hours with minimal effect on the boiler performance. This study aims to identify technically and economically most suitable gasification configuration and the reasonable operational limits of a CHP plant when integrated with different types of gasifiers. The selected gasifiers for the study are, (i) indirectly heated dual fluidized bed gasifier (DFBG), (ii) directly heated circulating fluidized bed gasifier (CFBG), and (iii) entrained flow gasifier (EFG). The gasifiers are selected on their ability to produce high-quality syngas from waste refused derived fuel (RDF). The syngas from the gasifiers is utilized to produce biomethane, whereas the heat and power from the CHP plant are consumed to run the gasification process. A detailed techno-economic analysis is performed using both flexible capacity and fixed capacity gasifiers and integrated with the CHP plant at full load. The results reveal that the integration leads to increase in operating time of the boiler for all gasifier configurations. The indirectly heated DFBG shows the largest biomethane production with less impact on the district heat and power production. Extra heat is available for biomethane production when the district heat and biomethane are prioritized, and the electric power is considered as a secondary product. Furthermore, the economic indicators reflect considerable dependency of integrated gasification performance on variable prices of waste biomass and biomethane. 

  • 52.
    Yan, Jinyue
    et al.
    Mälardalen University, School of Business, Society and Engineering, Future Energy Center.
    Raza Naqvi, Muhammad
    Mälardalen University, School of Business, Society and Engineering, Future Energy Center. KTH.
    Dahlquist, Erik
    Mälardalen University, School of Sustainable Development of Society and Technology. Mälardalen University, School of Business, Society and Engineering, Future Energy Center.
    Bioenergy polygeneration, carbon capture and storage related to the pulp and paper industry and power plants2013In: Biomass as Energy Source: Resources, Systems and Applications / [ed] Erik Dahlquist, Taylor & Francis Group, 2013, 1, p. 163-176Chapter in book (Refereed)
    Abstract [en]

     

    The use of energy is approximately 140 000 TWh per year globally. It is then interesting to note that biomass production is approximately 270 000 TWh/year, or roughly twice as much. This shows that biomass is not a marginal energy resource but more than enough to cover all our needs for both energy and food, if just the biomass is used efficiently. There has been a lot of discussion about using food for energy. This is quite relevant, and if we look at all resources like agricultural and forestry waste, the need to use food for energy is not needed. We can cover all our needs anyhow. The resources we have available and some other aspects like using the energy efficiently is covered in this book. One way of using energy efficiently is to use waste biomass or cellulosic materials in bio refineries, where production of fibers and products from fibers is combined with production of most chemicals we need in our daily life. This includes clothes, soap, perfume, medicines etc. Conventional pulp and paper applications are also covered. But it also includes bio-fuel for vehicles and even fuel for aviation is covered. It also includes production of heat, cool and electricity. That is, biomass can cover all our needs. The difficulty is to use the resources efficiently without harming the productivity long term. This book has the aim to give facts and inspiration to professionals like engineers and researchers, students as well as those working for different type of authorities or societal organizations.

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