Change search
Link to record
Permanent link

Direct link
BETA
Publications (10 of 47) Show all publications
Salman, C. A., Naqvi, M., Thorin, E. & Yan, J. (2019). A MULTI-CRITERIA DECISION ANALYSIS TO ASSESS DIFFERENT BIOFUELS PRODUCTION IN CHP-GASIFICATION BASED POLYGENERATION SYSTEMS. In: : . Paper presented at International Conference on Applied Energy 2019 Aug 12‐15, 2019, Västerås, Sweden.
Open this publication in new window or tab >>A MULTI-CRITERIA DECISION ANALYSIS TO ASSESS DIFFERENT BIOFUELS PRODUCTION IN CHP-GASIFICATION BASED POLYGENERATION SYSTEMS
2019 (English)Conference paper, Published paper (Refereed)
National Category
Chemical Engineering
Identifiers
urn:nbn:se:kau:diva-75362 (URN)
Conference
International Conference on Applied Energy 2019 Aug 12‐15, 2019, Västerås, Sweden
Available from: 2019-10-14 Created: 2019-10-14 Last updated: 2019-10-14
Anukam, A., Mohammadi, A., Naqvi, M. & Granström, K. (2019). A Review of the Chemistry of Anaerobic Digestion: Methods of Accelerating and Optimizing Process Efficiency. Processes, 7(8), 1-19, Article ID 504.
Open this publication in new window or tab >>A Review of the Chemistry of Anaerobic Digestion: Methods of Accelerating and Optimizing Process Efficiency
2019 (English)In: Processes, Vol. 7, no 8, p. 1-19, article id 504Article, review/survey (Refereed) Published
Abstract [en]

The anaerobic digestion technology has been in existence for centuries and its underlying theory established for decades. It is considered a useful technology for the generation of renewable energy, and provides means to alleviate problems associated with low access to energy. However, a great deal of current research is targeted towards the optimization of this technology under diverse digestion process conditions. This review presents an in-depth analysis of the chemistry of anaerobic digestion and discusses how process chemistry can be used to optimize system performance through identification of methods that can accelerate syntrophic interactions of different microorganisms for improved methanogenic reactions. Recent advances in addition to old research are discussed in order to offer a general but comprehensive synopsis of accumulated knowledge in the theory of anaerobic digestion, as well as an overview of previous research and future directions and opportunities of the AD technology. Achieving a sustainable energy system requires comprehensive reforms in not just economic, social and policy aspects, but also in all technical aspects, which represents one of the most crucial future investments for anaerobic digestion systems.

Place, publisher, year, edition, pages
Basel: MDPI, 2019
Keywords
anaerobic digestion, feedstock, syntrophic interaction, process chemistry, methane yield
National Category
Chemical Engineering
Research subject
Chemistry
Identifiers
urn:nbn:se:kau:diva-74884 (URN)10.3390/pr7080504 (DOI)000483747700019 ()
Available from: 2019-09-30 Created: 2019-09-30 Last updated: 2019-10-11Bibliographically approved
Anukam, A., Mohammadi, A., Naqvi, M. & Granström, K. (2019). A Review of the Chemistry of Anaerobic Digestion: Methods of Accelerating and Optimizing Process Efficiency. Processes, 7(8)
Open this publication in new window or tab >>A Review of the Chemistry of Anaerobic Digestion: Methods of Accelerating and Optimizing Process Efficiency
2019 (English)In: Processes, ISSN 2227-9717, Vol. 7, no 8Article in journal (Refereed) Published
Abstract [en]

The anaerobic digestion technology has been in existence for centuries and its underlying theory established for decades. It is considered a useful technology for the generation of renewable energy, and provides means to alleviate problems associated with low access to energy. However, a great deal of current research is targeted towards the optimization of this technology under diverse digestion process conditions. This review presents an in-depth analysis of the chemistry of anaerobic digestion and discusses how process chemistry can be used to optimize system performance through identification of methods that can accelerate syntrophic interactions of different microorganisms for improved methanogenic reactions. Recent advances in addition to old research are discussed in order to offer a general but comprehensive synopsis of accumulated knowledge in the theory of anaerobic digestion, as well as an overview of previous research and future directions and opportunities of the AD technology. Achieving a sustainable energy system requires comprehensive reforms in not just economic, social and policy aspects, but also in all technical aspects, which represents one of the most crucial future investments for anaerobic digestion systems.

Place, publisher, year, edition, pages
Basel: , 2019
Keywords
anaerobic digestion, feedstock, syntrophic interaction, process chemistry, methane yield
National Category
Chemical Engineering
Research subject
Chemical Engineering
Identifiers
urn:nbn:se:kau:diva-75361 (URN)10.3390/pr7080504 (DOI)
Available from: 2019-10-14 Created: 2019-10-14 Last updated: 2019-10-25Bibliographically approved
Abas, N., Kalair, A. R., Seyedmahmoudian, M., Naqvi, M., Campana, P. E. & Khan, N. (2019). Dynamic simulation of solar water heating system using supercritical CO2 as mediating fluid under sub-zero temperature conditions. Applied Thermal Engineering, 161, Article ID 114152.
Open this publication in new window or tab >>Dynamic simulation of solar water heating system using supercritical CO2 as mediating fluid under sub-zero temperature conditions
Show others...
2019 (English)In: Applied Thermal Engineering, ISSN 1359-4311, E-ISSN 1873-5606, Vol. 161, article id 114152Article in journal (Refereed) Published
Abstract [en]

CO2 is becoming increasingly important as a mediating fluid, and simulation studies are indispensable for corresponding developments. In this study, a simulation-based performance investigation of a solar water heating system using CO2 as a mediating fluid under sub-zero temperature condition is performed using the TRNSYS (R) software. The maximum performance is achieved at a solar savings fraction of 0.83 during July. The as lowest solar savingss fraction of 0.41 is obtained during December. The annual heat production of the proposed system under Fargo climate is estimated to be about 2545 kWh. An evacuated glass tube solar collector is designed, fabricated and tested for various climate conditions. Moreover, a detailed comparison of the system's performance at sub/supercritical and supercritical pressures shows that the annual heat transfer efficiency of the modeled system is 10% higher at supercritical pressure than at sub/supercritical pressures. This result can be attributd to the strong convection flow of CO2 caused by density inhomogeneities, especially in the near critical region. This condition resuls in high heat transfer rates.

Place, publisher, year, edition, pages
Oxford, UK: Pergamon Press, 2019
Keywords
Supercritical CO2, Sub-zero temperature, Solar water heating; NatRef, Refrigerant
National Category
Chemical Engineering
Research subject
Chemical Engineering
Identifiers
urn:nbn:se:kau:diva-75363 (URN)10.1016/j.applthermaleng.2019.114152 (DOI)000488887200070 ()
Available from: 2019-10-14 Created: 2019-10-14 Last updated: 2019-11-12Bibliographically approved
Rehan, M., Nizami, A.-S., Rashid, U. & Naqvi, M. (2019). Editorial: Waste Biorefineries: Future Energy, Green Products and Waste Treatment. Frontiers in Energy Research, 7, 1-3, Article ID UNSP 55.
Open this publication in new window or tab >>Editorial: Waste Biorefineries: Future Energy, Green Products and Waste Treatment
2019 (English)In: Frontiers in Energy Research, E-ISSN 2296-598X, Vol. 7, p. 1-3, article id UNSP 55Article in journal, Editorial material (Other academic) Published
Place, publisher, year, edition, pages
Frontiers Media S.A., 2019
Keywords
Waste-to-energy, waste biorefinery, green products, biofuels, bioenergy
National Category
Materials Chemistry
Research subject
Chemical Engineering
Identifiers
urn:nbn:se:kau:diva-73318 (URN)10.3389/fenrg.2019.00055 (DOI)000471720400001 ()
Available from: 2019-07-02 Created: 2019-07-02 Last updated: 2019-09-23Bibliographically approved
Tahir, M. H., Zhao, Z., Ren, J., Naqvi, M., Ahmed, M. S., Shah, T.-U. -., . . . Rahman, A. U. (2019). Fundamental investigation of the effect of functional groups on the variations of higher heating value. Fuel, 253, 881-886
Open this publication in new window or tab >>Fundamental investigation of the effect of functional groups on the variations of higher heating value
Show others...
2019 (English)In: Fuel, ISSN 0016-2361, E-ISSN 1873-7153, Vol. 253, p. 881-886Article in journal (Refereed) Published
Abstract [en]

The aims of this study is to investigate the effects of functional groups like [sbnd]C[dbnd]C[sbnd]and C[sbnd]OH on variation of higher heating values (HHV)of organic compounds. HHV of fuel hydrocarbons, gaseous and liquids including single bonded and multiple bonded carbons and green tea polyphenols (GTP)were determined by using Bomb Calorimeter. It was observed that, multiple bonded carbon and oxygen bonded carbon i.e. [sbnd]C[dbnd]C[sbnd]and [sbnd]C[sbnd]O[sbnd]result in less carbon reduced state while, also increase endothermicity of reactants by changing hybridization state with more s-character and hence, contribute to lower level of HHV. Besides, hydrogen bonding was also considered as the major cause of the difference in HHV of fuel hydrocarbons having the same molecular formula but different oxygen-bearing functional groups due to structure stabilization. These statements were further supported by the combination of Fourier transform infra-red spectra (FTIR)and HHV calculation of raw GTP (set as a representative of biomass)and its solid products obtained at 250 °C and 350 °C by thermal treatment done by using high temperature tube furnace.

Place, publisher, year, edition, pages
Elsevier Ltd, 2019
Keywords
Carbon reduced state, Functional group, Higher heating value, Hydrogen bonding, Structure stabilization
National Category
Chemical Sciences
Identifiers
urn:nbn:se:kau:diva-72511 (URN)10.1016/j.fuel.2019.05.079 (DOI)000471841600086 ()2-s2.0-85065840570 (Scopus ID)
Available from: 2019-06-13 Created: 2019-06-13 Last updated: 2019-07-04Bibliographically approved
Naqvi, S. R., Tariq, R., Hameed, Z., Ali, I., Naqvi, M., Chen, W.-H., . . . Shahbaz, M. (2019). Pyrolysis of high ash sewage sludge: Kinetics and thermodynamic analysis using Coats-Redfern method. Renewable energy, 131, 854-860
Open this publication in new window or tab >>Pyrolysis of high ash sewage sludge: Kinetics and thermodynamic analysis using Coats-Redfern method
Show others...
2019 (English)In: Renewable energy, ISSN 0960-1481, E-ISSN 1879-0682, Vol. 131, p. 854-860Article in journal (Refereed) Published
Abstract [en]

This study aims to investigate the thermo-kinetics of high-ash sewage sludge using thermogravimetric analysis. Sewage sludge was dried, pulverized and heated non-isothermally from 25 to 800 °C at different heating rates (5, 10 and 20 °C/min) in N2 atmosphere. TG and DTG results indicate that the sewage sludge pyrolysis may be divided into three stages. Coats-Redfern integral method was applied in the 2nd and 3rd stage to estimate the activation energy and pre-exponential factor from mass loss data using five major reaction mechanisms. The low-temperature stable components (LTSC) of the sewage sludge degraded in the temperature regime of 250–450 °C while high-temperature stable components (HTSC) decomposed in the temperature range of 450–700 °C. According to the results, first-order reaction model (F1) showed higher Ea with better R2 for all heating rates. D3, N1, and S1 produced higher Ea at higher heating rates for LTSC pyrolysis and lower Ea with the increase of heating rates for HTSC pyrolysis. All models showed positive ΔH except F1.5. Among all models, Diffusion (D1, D2, D3) and phase interfacial models (S1, S2) showed higher ΔG as compared to reaction, nucleation, and power-law models in section I and section II.

Place, publisher, year, edition, pages
Elsevier Ltd, 2019
Keywords
Kinetics, Pyrolysis, Sewage sludge, Thermodynamic parameters, Thermogravimetric analysis
National Category
Chemical Engineering
Research subject
Chemical Engineering
Identifiers
urn:nbn:se:kau:diva-69443 (URN)10.1016/j.renene.2018.07.094 (DOI)000449892600076 ()2-s2.0-85053205748 (Scopus ID)
Available from: 2018-10-02 Created: 2018-10-02 Last updated: 2018-12-13Bibliographically approved
Salman, C. A., Schwede, S., Naqvi, M., Thorin, E. & Yan, J. (2019). Synergistic combination of pyrolysis, anaerobic digestion, and CHP plants. In: Energy Procedia: . Paper presented at 10th International Conference on Applied Energy, ICAE 2018, 22 August 2018 through 25 August 2018 (pp. 1323-1329). Elsevier
Open this publication in new window or tab >>Synergistic combination of pyrolysis, anaerobic digestion, and CHP plants
Show others...
2019 (English)In: Energy Procedia, Elsevier, 2019, p. 1323-1329Conference paper, Published paper (Refereed)
Abstract [en]

The anaerobic digestion of biodegradable fraction of municipal solid waste (MSW) is a widely used process for biogas production. However, the biodegradable fraction of MSW also contains lignocellulosic waste which hinders the biogas production if added to the digester in higher quantity. So it needs to be separated from biodegradable waste and sent for alternate treatment, e.g., incineration, landfilling or compositing. Pyrolysis of lignocellulosic waste to produce biochar, syngas, and bio oil is an alternate treatment to consider. Furthermore, there is a reported correlation between the addition of biochar in the digester and higher biogas production. Previously, we coupled the pyrolysis of lignocellulosic waste with anaerobic digestion plant. Pyrolysis produces the biochar and vapors. Biochar was added in the digester to enhance the biomethane production. The vapors produced in the pyrolysis process were converted to biomethane through the catalytic methanation process. The combination gives the overall efficiency of 67%. In this work, we modified the process concept to increase the integration level of these processes. The main issue with the pyrolysis process is its heat required to operate, while some of its downstream processes also generate excess heat. In this study, the pyrolysis of lignocellulosic waste is integrated with an operating combined heat and power (CHP) plant, by using its existing infrastructure for heat transport among different pyrolysis operations. The combustor of the CHP plant provides the heat for drying and pyrolysis while the excess heat is transferred back to the combustor. The biochar produced from pyrolysis is transported back to the digester as an adsorbent. The process simulation results show that the combined efficiency of pyrolysis with CHP plant reached 80%. If the biochar is sent back to the anaerobic digester, the synergetic efficiency of all three processes, i.e., pyrolysis-CHP and anaerobic digestion was obtained at 79.7% as compared with the 67% efficiency when the pyrolysis was only integrated with the anaerobic digestion process.

Place, publisher, year, edition, pages
Elsevier, 2019
Series
Energy Procedia, ISSN 1876-6102
Keywords
Heat integration, Lignocellulosic waste, Municipal solid waste, Biogas, Cogeneration plants, Combustors, Power generation, Pyrolysis, Waste incineration, Anaerobic digestion process, Biodegradable fraction, Biodegradable wastes, Combined heat and power, Lignocellulosic wastes, Municipal solid waste (MSW), Synergistic combinations, Anaerobic digestion
National Category
Chemical Engineering
Research subject
Chemical Engineering
Identifiers
urn:nbn:se:kau:diva-72138 (URN)10.1016/j.egypro.2019.01.326 (DOI)000471031701106 ()2-s2.0-85063896503 (Scopus ID)
Conference
10th International Conference on Applied Energy, ICAE 2018, 22 August 2018 through 25 August 2018
Funder
Knowledge Foundation, 20120276
Available from: 2019-05-23 Created: 2019-05-23 Last updated: 2019-07-04Bibliographically approved
Khan, Z., Yusup, S., Kamble, P., Naqvi, M. & Watson, I. (2018). Assessment of energy flows and energy efficiencies in integrated catalytic adsorption steam gasification for hydrogen production. Applied Energy, 225, 346-355
Open this publication in new window or tab >>Assessment of energy flows and energy efficiencies in integrated catalytic adsorption steam gasification for hydrogen production
Show others...
2018 (English)In: Applied Energy, ISSN 0306-2619, E-ISSN 1872-9118, Vol. 225, p. 346-355Article in journal (Refereed) Published
Abstract [en]

This study addresses the energy flows and energy efficiency of integrated catalytic adsorption biomass steam gasification for hydrogen production in a pilot scale bubbling fluidized bed system utilizing palm kernel shell as feedstock. The integrated catalytic adsorption utilizes catalyst and CO2 adsorbent together in the single fluidized bed gasifier. Various variables such as effect of temperature (600–750 °C), steam to biomass ratio (1.5–2.5 w/w), adsorbent to biomass ratio (0.5–1.5 w/w), fluidization velocity (0.15–0.26 m/s) and biomass particle size (0.355–0.500 to 1.0–2.0 mm) are investigated. The results imply that the overall requirement of gasification energy increases with increasing gasification temperature, steam to biomass ratio, fluidization velocity, and decreases with adsorbent to biomass ratio whilst no significant increase is observed by varying the biomass particle size. However, a slight reduction in required energy is observed from 600 °C to 675 °C which might be due to strong CO2 adsorption, an exothermic reaction, and contributes to the energy requirements of the process. Besides, hydrogen-based energy efficiencies increase with increasing temperature while first increases to a medium value of steam to biomass ratio (2.0), adsorbent to biomass ratio (1.0) and fluidization velocity (0.21 m/s) followed by a slight decrease (or remains unchanged). The integrated catalytic adsorption steam gasification is found to be a high energy consuming process and thus, waste heat integration needs to be implemented for feasible hydrogen production

Place, publisher, year, edition, pages
Elsevier, 2018
Keywords
Energy efficiency, Energy flow, Fluidized bed, Hydrogen, Integrated, Steam gasification
National Category
Chemical Process Engineering Energy Systems
Identifiers
urn:nbn:se:kau:diva-67493 (URN)10.1016/j.apenergy.2018.05.020 (DOI)000438181000024 ()2-s2.0-85047071819 (Scopus ID)
Available from: 2018-06-07 Created: 2018-06-07 Last updated: 2019-11-08Bibliographically approved
Naqvi, S. R. & Naqvi, M. (2018). Catalytic fast pyrolysis of rice husk: Influence of commercial and synthesized microporous zeolites on deoxygenation of biomass pyrolysis vapors. International journal of energy research (Print), 42(3), 1352-1362
Open this publication in new window or tab >>Catalytic fast pyrolysis of rice husk: Influence of commercial and synthesized microporous zeolites on deoxygenation of biomass pyrolysis vapors
2018 (English)In: International journal of energy research (Print), ISSN 0363-907X, E-ISSN 1099-114X, Vol. 42, no 3, p. 1352-1362Article in journal (Refereed) Published
Abstract [en]

Research on utilization of abundant rice residue for valuable bioenergy products is still not explored completely. A simple, robust, cheap, and one-step fast pyrolysis reactor is still a key demand for production of bioenergy products, ie, high quality bio-oil and biochar. Bio-oil extracted from fast pyrolysis does not have adequate quality (eg, acidic and highly oxygenated). Catalytic fast pyrolysis using zeolites in the fast pyrolysis process effectively reduces the oxygen content (no H-2 required). In this paper, the zeolites with different pore sizes and shapes (small pore, SAPO-34 (0.56) and ferrierite (30); medium pore, ZSM-5 (30), MCM-22 (30), and ITQ-2 (30); and large pore zeolite, mordenite (30)) were tested in a drop-type fixed-bed pyrolyzer. Catalytic deoxygenation is conducted at 450 degrees C at the catalyst/biomass ratio of 0.1. Zeolite catalysts, its pore size and shape, could influence largely on deoxygenation. It was found that the small pore zeolites did not produce aromatics as compared to higher amount of aromatics formed in case of medium pore zeolites. ZSM-5 and ITQ-2 zeolites were especially efficient for the higher deoxygenation of biomass pyrolysis vapors due to better pore dimension and higher acidity.

Place, publisher, year, edition, pages
Wiley-Blackwell, 2018
Keywords
acidity, biomass pyrolysis, deoxygenation, micropore topology, zeolites
National Category
Chemical Engineering
Research subject
Chemical Engineering
Identifiers
urn:nbn:se:kau:diva-74899 (URN)10.1002/er.3943 (DOI)000425185500038 ()
Available from: 2019-09-30 Created: 2019-09-30 Last updated: 2019-10-11Bibliographically approved
Organisations
Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0002-4359-2232

Search in DiVA

Show all publications