Souman Rudra

• Tareq, Foysal Kabir & Rudra, Souman (2024). Enhancing the performance of silicon-based anode materials for alkali metal (Li, Na, K) ion battery: A review on advanced strategies. Materials Today Communications. ISSN 2352-4928. 39. doi: 10.1016/j.mtcomm.2024.108653.
• Prokhorskii, Gleb Vladimirovich; Eder, Elias; Rudra, Souman & Preißinger, Markus (2023). A benchmark study of supervised learning methods for predicting the live steam production of thermal power plants. I Riehl, Roger R. (Red.), 10th Heat-Powered Cycles Conference. The University of Edinburgh. ISSN 978-1-912669-63-9. s. 313–323.
• Nielsen, Henrik Kofoed; Vehus, Tore; Rudra, Souman & Kristiansen, Nils Randulf (2022). Chapter 9 - Biomass production, storage, and pretreatment for the production of solid biofuels. I Gomez Castro, Fernando & Gutierrez-Antonio, Claudia (Red.), Biofuels and Biorefining Volume 1: Current Technologies for Biomass Conversion. Elsevier. ISSN 9780128241165. s. 339–380. doi: 10.1016/B978-0-12-824116-5.00003-9.
• Jayathilake, Madhawa; Rudra, Souman & Christy, Alfred Antony (2021). Effect of co-liquefaction of lignin and laminaria saccharina on optimization of bio-oil yield. Energy Conversion and Management: X. doi: 10.1016/j.ecmx.2021.100151.
• Rudra, Souman & Jayathilake, Madhawa (2021). Hydrothermal Liquefaction of Biomass for Biofuel Production. I NN, NN (Red.), Earth Systems and Environmental Sciences. Elsevier. ISSN 9780124095489. doi: 10.1016/B978-0-12-819727-1.00043-1.
• Jayathilake, Madhawa; Rudra, Souman & Rosendahl, Lasse A. (2021). Numerical modeling and validation of hydrothermal liquefaction of a lignin particle for biocrude production. Fuel. ISSN 0016-2361. 305. doi: 10.1016/j.fuel.2021.121498. Fulltekst i vitenarkiv
• Jayathilake, Madhawa; Rudra, Souman; Akhtar, Naureen & Christy, Alfred Antony (2021). Characterization and Evaluation of Hydrothermal Liquefaction Char from Alkali Lignin in Subcritical Temperatures. Materials. ISSN 1996-1944. 14(11). doi: 10.3390/ma14113024. Fulltekst i vitenarkiv
• Jayathilake, Madhawa; Rudra, Souman & Rosendahl, Lasse A. (2020). Hydrothermal liquefaction of wood using a modified multistage shrinking-core model. Fuel. ISSN 0016-2361. 280. doi: 10.1016/j.fuel.2020.118616. Fulltekst i vitenarkiv
• Rudra, Souman & Tesfagaber, Yohannes Kifle (2019). Future district heating plant integrated with municipal solid waste (MSW) gasification for hydrogen production. Energy. ISSN 0360-5442. 180, s. 881–892. doi: 10.1016/j.energy.2019.05.125. Fulltekst i vitenarkiv
• Jayathilake, Rukshan & Rudra, Souman (2017). Numerical and Experimental Investigation of Equivalence Ratio (ER) and Feedstock Particle Size on Birchwood Gasification. Energies. ISSN 1996-1073. doi: 10.3390/en10081232. Fulltekst i vitenarkiv
• Rudra, Souman & Rosendahl, Lasse (2016). Techno-economic analysis of a local district heating plant under fuel flexibility and performance. Energy Efficiency. ISSN 1570-646X. s. 1–12. doi: 10.1007/s12053-016-9475-2. Fulltekst i vitenarkiv
• Rudra, Souman; Rosendahl, Lasse & Blarke, Morten B. (2015). Process analysis of a biomass-based quad-generation plant for combined power, heat, cooling, and synthetic natural gas production. Energy Conversion and Management. ISSN 0196-8904. 106, s. 1276–1285. doi: 10.1016/j.enconman.2015.10.072. Fulltekst i vitenarkiv
• Rudra, Souman; Rosendahl, Lasse & Kumar, Amit (2014). Development of net energy ratio and emission factor for quad-generation pathways. Energy Systems, Springer Verlag. ISSN 1868-3967. 5(4), s. 719–735. doi: 10.1007/s12667-014-0126-4.
• Rudra, Souman; Rosendahl, Lasse & Hoffmann, Jessica (2013). Conceptual design of an integrated hydrothermal liquefaction and biogas plant for sustainable bioenergy production. Bioresource Technology. ISSN 0960-8524. doi: 10.1016/j.biortech.2012.11.051.

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• Rudra, Souman & Akhtar, Taimur (2023). Algal Biomass Conversion: Hydrothermal Liquefaction for Advanced Bio-Fuel Production. I et al, . (Red.), Reference Module in Earth Systems and Environmental Sciences 2023 . Elsevier. ISSN 978-0-12-409548-9. doi: https:/doi.org/10.1016/B978-0-323-93940-9.00233-4. Vis sammendrag

  e rapid increase in energy demand and environmental challenges enable us to find substitutes to meet the increasing energy demand and satisfy the environmental standards. In this context, eco-friendly algae biomass and advanced conversion technology such as hydrothermal liquefaction (HTL) appear to be exciting solutions. Algae biomass has a carbon-neutral nature, and it has high photosynthetic efficiency, while HTL is a thermochemical technique capable of converting whole algae biomass into biofuel and other by-products. This chapter briefly enlightens the concepts of HTL technology, the recent progress, and the impact of process operating conditions on biofuel. Additionally, it briefly outlines the challenges associated with converting algae biomass into biofuel and provides a succinct overview of the future outlook in this field.

• Rudra, Souman & Akhtar, Taimur (2023). Experimental study on hydrothermal co-liquefaction of Laminaria digitata and Chlorella vulgaris to investigate the impact of the bio-oil yield.
• Rudra, Souman (2022). The role of bioenergy in the EU renewable energy system. Illuminem. Vis sammendrag

  The rapid increase of environmental pollution, global warming, the depletion of the available fossil fuels, and the increasing energy demand have urged the modern world to move on to sustainable and renewable energy sources. The role of renewable energy, especially solar and wind, is increasing more rapidly. However, bioenergy contributes to providing the bulk of heat and transportation fuels. In addition, the recent Russian invasion of Ukraine shows why the EU needs to be independent in the energy sector. The European Commission has already proposed an outline of a plan to make Europe independent from Russian fossil fuels well before 2030[1]. Therefore, the role of bioenergy in the EU energy system is significant in the future.

• Rudra, Souman (2022). International cooperation will provide better expertise on renewable energy. [Internett]. Norway.
• Rudra, Souman (2022). Hydrothermal processing of biomass for biofuels and biochemicals.
• Rudra, Souman (2021). Waste to Energy possible technologies for Bangladesh.
• Rudra, Souman (2021). Carbondioxide(CO2) based cooling system at CERN.
• Jayathilake, Rukshan & Rudra, Souman (2020). Char Phase Behavior of Hydrothermal Conversion of Alkali Lignin in Subcritical Temperatures.
• Jayathilake, Madhawa & Rudra, Souman (2019). Hydrothermal Liquefaction modeling of lignin Using A Modified Multistage Shrinking-Core Model.
• Rudra, Souman (2019). Hydrothermal Liquefaction for bio-fuel and Chemicals: An overview.
• Rudra, Souman (2018). Process Symbiosis local process industries CO2 emission capture and utilization integrated with bio-gas production.
• Rudra, Souman & Tesfagaber, Yohannes Kifle (2018). Future district heating plant integrated with sustainable hydrogen production. .
• Rudra, Souman (2018). HTL-drivstoff - erfaring og planer ved Universitetet i Agder.
• Rudra, Souman (2018). Analysis of hydrogen production from waste-to-energy plant by gasification .
• Rudra, Souman & Jayathilake, Rukshan (2017). Effects of variable feedstock particle size on Birchwood gasification: A CFD approach. Vis sammendrag

  Gasification is a complex process and determining gasification characteristics experimentally is a time consuming process. Using CFD models to predict and examine about gasification characteristics, in various scenario can be time saving and safe. This paper primarily discusses the results of a CFD model, which simulates gasification characteristics of Birchwood. During the work, variation of producer gas yield, syngas composition and cold gas efficiency of the syngas were investigated with a variable biomass particle size. A 3D CFD model of a fixed bed downdraft gasifier has been developed. Euler –Euler approach has been used to model the gas phase reactions while, Lagrangian approach has been used to model the solid- gas reactions. For the simulations, biomass (Birchwood) particles with two different diameter sizes were used. They were 11.5mm and 9.18 mm. In this work, gasification parameters were examined within the equivalence ratio (ER) range from 0.2 to 0.5. The simulated results were validated using the actual fixed bed downdraft gasifier available at UIA, Norway. CO, CO2, CH4 and H2 mass fractions of the syngas were measured along with the calculated values of syngas yield and cold gas efficiency (CGE). With the 9.18mm diameter birchwood particle, CGE has shown an average maximum value of 59.4 % at the ER value of 0.5, which is a 4% improvement over the 11.5mm diameter biomass particle. In addition, Syngas yield has also shown an average maximum value of 2.8 Nm3/h with the 9.18 mm wood particle, which is an improvement of 0.1 Nm3/h over the 11.5 mm biomass particle

• Rudra, Souman & Haugstad, Bjørn (2017). Process Analysis of Hydrothermal Liquefaction of Algae. Vis sammendrag

  Hydrothermal liquefaction is a promising process for future biofuel production. Complex reactions occurring during the process are not fully discovered, thus accurate simulations are not yet attainable. Several batch experiments have been seen but only a few continuous flow systems. Three different microalgae biomass were analyzed using TGA (Thermogravity analysis), Proximate analysis and Ultimate analysis. Properties from these algae analyses were used in the Aspen Plus simulation model. The Aspen Plus simulation tool was used to model the HTL of three species of algae. The energy consumption of the main components was considered, and a process optimization was done by implementing a heat exchanger. Without a heat exchanger, a large amount of waste heat was not utilized in the system and it showed poor efficiency for the whole process. Still, there was potential for heat integration and optimization of the system. Water recycling, district heating or other options could be considered. The efficiency of the system was improved when products in all the streams are utilized. S. platensis and P. tricornutum algae obtained 83 % energy efficiency for the HTL process. Annual production of biocude was 180,000 liters from S. platensis, 211,000 from C. vulgaris and 124,000 from P tricornutum. The outcome of the simulation is mainly determined by the composition of components in the product stream.

• Rudra, Souman (2016). Waste to Energy- Perspective technologies for Bangladesh.
• Rudra, Souman & Jayathilake, Rukshan (2016). A Computational Fluid Dynamics Analysis for the effects of variable Equivalence Ratio (ER) On Birchwood Gasification.
• Akhtar, Taimur & Rudra, Souman (2015). Conceptual model in aspen plus for recovery of biocrude from hydrothermal algal biomass liquefaction.
• Rudra, Souman (2014). Biomass Gasification for quad-generation system.
• Rudra, Souman (2014). Process analysis of biomass based quad-generation plant.
• Rudra, Souman & Rosendahl, Lasse (2012). Development of net energy ratio for quadgeneration pathways.
• Rudra, Souman & Rosendahl, Lasse (2011). Optimization of a Local District Heating Plant Under Fuel Flexibility and Performance. Vis sammendrag

  Brovst is a small district in Denmark. Based on the case of Brovst, this paper analyses the role of district heating in future Renewable Energy Systems. The present use of fossil fuels in the Brovst DHP (district heating plant) represents an increasing environmental and climate-related load. So, an investigation has been made to reduce the use of fossil fuels for district heating system and make use of the local renewable resources (Biogas, Solar and Geothermal) for district heating purpose. In this article, the techno-economic assessment is achieved through the development of a suite of models that are combined to give cost and performance data for this district heating system. Different local fuels have been analyzed for different perspectives to find the way to optimize the whole integrated system in accordance with fuel availability and cost. This paper represents the energy system analysis mode energyPRO which has been used to analyses the integration of large scale energy system into the domestic district heating system. A model of the current work on the basis of information from the plant (using fossil fuel) is established and named as a reference model. Then different solutions are calculated for various local fuels in energyPRO. A comparison has been made between the reference model and the basis for individual solutions. The greatest reduction in heat price is obtained by replacing one engine with a new biogas where heat production is divided by 66% of biogas, 13% natural gas engines and 21% natural gas boilers.

• Rudra, Souman; Rosendahl, Lasse & Kim, Hyung Taek (2010). A performance analysis of integrated solid oxide fuel cell and heat recovery steam generator for IGFC system. Frontiers in Energy. ISSN 2095-1701. doi: 10.1007/s11708-010-0122-x.
• Jayathilake, Madhawa & Rudra, Souman (2022). Numerical modelling and validation of Hydrothermal liquefaction of Lignin: Shrinking core approach on particle decomposition and a comparative analysis of biocrude and HTL char. universitetet I Agder. ISSN 978-82-8427-071-5.

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