ORCID Profile
0000-0002-8235-9839
Current Organisation
Bangladesh University of Engineering and Technology
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Publisher: Elsevier BV
Date: 2014
Publisher: Elsevier BV
Date: 06-2023
Publisher: Bangladesh Journals Online (JOL)
Date: 1970
Abstract: This work aims to study the quality of three products of a fractionation column considering different design conditions of the column using natural gas condensate as column feed. The first design was on a single traditional distillation column whereas the consecutive studies were done by modifying the distillation column to yield the same quality of products. This study includes the details quality variation along with the variation of design. The whole simulation study and analysis was done on ASPENTM HYSYS 7.1. Keywords simulation fractionation distillation ASPEN design. DOI: 10.3329/jce.v25i0.7241Journal of Chemical Engineering, IEB Vol. ChE. 25, No. 1, December 2010 pp.65-70
Publisher: Elsevier BV
Date: 09-2015
Publisher: American Chemical Society (ACS)
Date: 22-10-2012
DOI: 10.1021/IE301530J
Publisher: Elsevier BV
Date: 08-2017
DOI: 10.1016/J.BIORTECH.2017.02.019
Abstract: This study evaluated the techno-economic performance and potential benefits of methanol production through catalytic gasification of forest residues and lignin. The results showed that while catalytic gasification enables increased cold gas efficiencies and methanol yields compared to non-catalytic gasification, the additional pre-treatment energy and loss of electricity production result in small or no system efficiency improvements. The resulting required methanol selling prices (90-130€/MWh) are comparable with production costs for other biofuels. It is concluded that catalytic gasification of forest residues can be an attractive option as it provides operational advantages at production costs comparable to non-catalytic gasification. The addition of lignin would require lignin costs below 25€/MWh to be economically beneficial.
Publisher: IEEE
Date: 12-2010
Publisher: Bangladesh Journals Online (JOL)
Date: 23-06-2021
Abstract: The CO2 emission is more than 36 billion tons per year in global scale. As carbon dioxide emission raises global temperature by trapping solar energy in the atmosphere, research is ongoing to facilitate the capture of CO2 with high efficiency. While CO2 footprint of Bangladesh is relatively low, with upcoming coal-based power plants ( MW) in the next decade, fossil CO2 emission will increase significantly. To understand the underlying benefit of CO2 capture process, cradle-to-gate life cycle impact assessment (LCIA) of the power plants using fossil sources (e.g. natural gas, coal) can provide an in-depth insight. This paper aims to conduct life cycle impact assessment on natural gas and coal (sub critical and supercritical) fired power plants with and without CO2 capture facility for comparison of overall impact on the environment. An open source software titled OpenLCA was used to carry out LCIA and study different impact parameters (i.e. green-house gas emission, toxicity and ozone layer depletion). It was found that the CO2 emission from super-critical pulverized coal (SCPC) and sub-critical pulverized coal (Sub-PC) fired power plants could be brought down by more than 80% using CO2 capture facility. Along with capture, it is equally important to ensure proper sinks for this captured CO2. As Bangladesh has no dedicated geological reservoir for CO2 storage, potential sink for captured CO2 could be immediate utilization after capture. This paper also presents preliminary results on utilizing CO2 through mineralization during preparation of alternative admixture and construction materials. Due to the ever-growing real-estate sector of Bangladesh, there is great potential in capturing and utilizing CO2 through construction activities. Chemical Engineering Research Bulletin 21(2020) 88-93
Publisher: Bangladesh Journals Online (JOL)
Date: 31-12-2009
Publisher: Wiley
Date: 12-01-2017
Publisher: Elsevier BV
Date: 03-2012
DOI: 10.1016/J.BIORTECH.2011.12.094
Abstract: Apart from capturing carbon dioxide, fresh water algae can be used to produce biofuel. To assess the energy potential of Chlorococcum humicola, the alga's pyrolytic behavior was studied at heating rates of 5-20K/min in a thermobalance. To model the weight loss characteristics, an algorithm was developed based on the distributed activation energy model and applied to experimental data to extract the kinetics of the decomposition process. When the kinetic parameters estimated by this method were applied to another set of experimental data which were not used to estimate the parameters, the model was capable of predicting the pyrolysis behavior, in the new set of data with a R(2) value of 0.999479. The slow weight loss, that took place at the end of the pyrolysis process, was also accounted for by the proposed algorithm which is capable of predicting the pyrolysis kinetics of C. humicola at different heating rates.
Publisher: Bangladesh Journals Online (JOL)
Date: 23-06-2021
Abstract: Nowadays, researchers have found many applications of biochar due to its large surface area, ion and water holding capacity, sheltering possibility for microbes beneficial for the plants’ nutrition intake, carbon sequestration etc. Among several waste biomass feedstock, agricultural waste is a suitable source of biomass for the biochar production. So, in this study, a low cost, modular technology was proposed that can be used at the consumer end to produce biochar of satisfactory quality. In this technology, no separate inert gas feed was required, thereby lowering the cost and complexity of the system. The reactor was designed in a way that most of the oxygen got consumed at the beginning of the process and the residual nitrogen from air maintained a pseudo-inert environment. As potential feedstock for biochar, rice husk and wood chips were considered in this study. Also, to evaluate the quality of produced biochar, proximate analysis and calorific value were measured. The char yields were found to be between 20 to 40%. For rice husk (powdered and granular) and wood chips, the volatile content (%) were 15.88, 19.69 and 25.47 respectively meaning most of the volatiles were released during devolatilization. It was found that biochar can be produced from agricultural waste using this method by farmers in the field without any additional equipment, and the pyrolyzer is modular and portable. Finally, the biochar could be used for soil replenishment. Further work is ongoing on the char characterization to realize the full potential of biochar production from waste biomass. Chemical Engineering Research Bulletin 21(2020) 14-19
Publisher: Springer Science and Business Media LLC
Date: 02-04-2021
Publisher: Bangladesh Journals Online (JOL)
Date: 23-06-2021
Abstract: Municipal solid waste (MSW) is one of the top contributors in greenhouse gas (i.e. methane) emissions - particularly from landfill disposals. However, it could be a remarkable source of renewable energy. In Bangladesh, generation of municipal solid waste is at least 2.7 million tonne per year in the major cities, implying a heavy environmental burden. On the other hand, there are several coal-based power plants are in the pipeline to meet the increasing energy demand in Bangladesh with the potential of significant CO2 emission. To find a remedy to the above situation, a power plant using Integrated Gasification and Combustion Cycle (IGCC) technology with pre-combustion carbon capture is considered in this study. IGCC has the advantage of producing high quality syngas from a wide variety of feed and assists in the capture of CO2 at a lower cost while providing high electric efficiency. The power plant was simulated by commercial simulation packages (Aspen PLUS™ and Aspen HYSYS™) using MSW and bituminous coal (Indonesian) as a combined feed. With a feed rate of 1800 tonne per day, Syngas produced from an entrained flow type gasifier was then treated for CO2 removal using mono-ethanol amine (MEA) solvent after necessary shift in a high temperature shift reactor. About 91% efficiency was achieved in the shift reactor while the CO2 capture efficiency was varied for this study from 30% to 85%. Further parametric variation was studied by varying the moisture content of MSW and MSW to coal feed ratio. Through combustion of the H2 rich syngas in a gas turbine and subsequent steam cycle with reheat resulted in 125 MW of electricity at an efficiency of 28.95% while capturing 50% of the CO2 generated in the process for an MSW to Coal feed ratio of 1:1. With variation in moisture content especially during monsoon season, the plant efficiency could be affected remarkably. On the other hand, it was observed that the energy requirement varied from 6 to 8 MW for every 10% increase in CO2 capture quantity. Overall, by capturing 50% of the generated CO2, it is possible to reduce the emission of a same size ultra-supercritical coal-based power plant from about 700 kg CO2/MWh to about 360 kg of net CO2/MWh incorporating co-feeding and pre-combustion capture in an IGCC power plant. Chemical Engineering Research Bulletin 21(2020) 37-42
Publisher: Bangladesh Journals Online (JOL)
Date: 31-12-2009
Publisher: Elsevier BV
Date: 06-2018
Publisher: Informa UK Limited
Date: 02-05-2018
Publisher: MDPI AG
Date: 09-12-2022
DOI: 10.3390/EN15249340
Abstract: Hydrothermal carbonization (HTC) is a prominent thermochemical technology that can convert high-moisture waste into a valuable product (called hydrochar) at a relatively mild treatment condition (180–260 °C and 2–10 MPa). With rapidly growing research on HTC and hydrochar in recent years, review articles addressing the current and future direction of this research are scarce. Hence, this article aims to review various emerging applications of hydrochars, e.g., from solid fuel to soil amendment, from electron storage to hydrogen storage, from dye adsorption, toxin adsorption, heavy metal adsorption to nutrient recovery, and from carbon capture to carbon sequestration, etc. This article further provides an insight in the hydrochar’s working mechanism for various applications and how the applications can be improved through chemical modification of the hydrochar. Finally, new perspectives with appropriate recommendations have been made to further unveil potential applications and its improvement through hydrochar and its modified version.
Publisher: Springer Science and Business Media LLC
Date: 21-09-2020
Publisher: Springer Science and Business Media LLC
Date: 14-07-2015
Publisher: IEEE
Date: 20-10-2020
Publisher: Springer Science and Business Media LLC
Date: 14-01-2017
Publisher: American Chemical Society (ACS)
Date: 17-04-2018
Publisher: Elsevier BV
Date: 08-2017
Publisher: Elsevier BV
Date: 2017
Publisher: Elsevier
Date: 2018
Publisher: Elsevier
Date: 2020
Publisher: Elsevier BV
Date: 02-2023
Publisher: Elsevier BV
Date: 06-2017
Publisher: Wiley
Date: 12-09-2022
DOI: 10.1002/BBB.2426
Abstract: Producing hydrochar from landfill municipal solid wastes (MSW) is a sustainable alternative to existing waste management practices in low‐ and middle‐income countries. In this study, mixed MSW feedstock (sent for landfilling) was subjected to hydrothermal carbonization to produce hydrochars. The hydrochar showing the highest heating value was subjected to pyrolysis at 5, 10, and 20 K min −1 heating rates. Based on the pyrolysis characteristics, a three pseudo‐component‐based distributed activation energy model was employed to describe the pyrolysis kinetics. The activation energy distributions for the three pseudo‐components were 140 ± 8.7 kJ mol −1 , 190 ± 1 kJ mol −1 and 175.9 ± 24.9 kJ mol −1 , which were able to predict the pyrolysis profile at all heating rates with R 2 0.999. Differential thermogravimetric profiles of the hydrochar revealed its pyrolytic reactivity to resemble lignocellulosic constituents. Fourier‐transform infrared analysis of the hydrochar showed retention of oxygen‐containing functional groups (associated with lignocellulosic constituents) from the parent feedstock. © 2022 Society of Chemical Industry and John Wiley & Sons, Ltd.
Publisher: Elsevier BV
Date: 12-2018
Publisher: Elsevier BV
Date: 03-2012
Publisher: American Chemical Society (ACS)
Date: 04-2016
Publisher: American Chemical Society (ACS)
Date: 12-01-2015
DOI: 10.1021/SC500777U
Publisher: Elsevier BV
Date: 2014
DOI: 10.1016/J.BIORTECH.2013.10.034
Abstract: Three types of woody biomass were investigated under pyrolysis condition to observe the change in the surface functional groups by Fourier transform infrared (FTIR) technique with increasing temperature under two different (5 and 150°C/min) heating rates. The experiments were carried out in situ in the infrared microscopy beamline (IRM) of the Australian Synchrotron. The capability of the beamline made it possible to focus on single particles to obtain low noise measurements without mixing with KBr. At lower heating rate, the surface functional groups were completely removed by 550°C. In case of higher heating rate, a delay was observed in losing the functional groups. Even at a high temperature, significant number of functional groups was retained after the higher heating rate experiments. This implies that at considerably high heating rates typical of industrial reactors, more functional groups will remain on the surface.
Publisher: Wiley
Date: 16-03-2017
Publisher: Elsevier BV
Date: 10-2014
Publisher: Elsevier BV
Date: 10-2023
Publisher: Bangladesh Journals Online (JOL)
Date: 31-12-2009
Publisher: Elsevier BV
Date: 08-2013
Publisher: Elsevier BV
Date: 09-2023
Location: Bangladesh
Location: Bangladesh
No related grants have been discovered for Kawnish Kirtania.