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Mohammad Rofiqul Islam - One of the best experts on this subject based on the ideXlab platform.

  • fast pyrolysis for better utilization of tamarind seed from renewable energy point of view
    Science & Engineering Faculty, 2011
    Co-Authors: M A Kader, Mohammad Rofiqul Islam, Mohammad Uzzal Hossain Joardder
    Abstract:

    The conversion of tamarind seeds into pyrolytic oil by fixed bed Fire-Tube heating reactor has been taken into consideration in this study. The major components of the system were fixed bed Fire-Tube heating reactor, liquid condenser and collectors. The raw and crushed tamarind seed in particle form was pyrolized in an electrically heated 10 cm diameter and 27 cm high fixed bed reactor. The products are oil, char and gases. The parameters varied were reactor bed temperature, running time, gas flow rate and feed particle size. The parameters were found to influence the product yields significantly. The maximum liquid yield was 45 wt% at 4000C for a feed size of 1.07cm3 at a gas flow rate of 6 liter/min with a running time of 30 minute. The pyrolysis oil was obtained at these optimum process conditions were analyzed for physical and chemical properties to be used as an alternative fuel.

  • properties of sugarcane waste derived bio oils obtained by fixed bed Fire Tube heating pyrolysis
    Bioresource Technology, 2010
    Co-Authors: Mohammad Rofiqul Islam, Momtaz Parveen, Hiroyuki Haniu
    Abstract:

    Abstract Agricultural waste in the form of sugarcane bagasse was pyrolyzed in a fixed-bed Fire-Tube heating reactor under different pyrolysis conditions to determine the role of final temperature, sweeping gas flow rate and feed size on the product yields. Final temperature range studied was between 375 and 575 °C and the highest liquid product yield was obtained at 475 °C. Liquid products obtained under the most suitable conditions were characterized by physical properties, elemental analysis, GCV, FT-IR, 1 H NMR analysis and distillation. The empirical formula of the bio-oil with heating value of 23.5 MJ/kg was established as CH 1.68 O 0.557 N 0.012 . Comparison with other approaches showed that the liquid product yield by this simpler reactor system was higher with better physico-chemical properties as fuel. These findings show that fixed-bed Fire-Tube heating pyrolysis is a good option for production of bio-oils from biomass solid wastes.

  • Technology development for bio-crude oil from pyrolysis of renewable biomass resource
    2009 1st International Conference on the Developements in Renewable Energy Technology (ICDRET), 2009
    Co-Authors: Mohammad Rofiqul Islam, Momtaz Parveen, Md. Rabiul Islam, Hiroyuki Haniu
    Abstract:

    The objective of this study is to provide an innovation in pyrolysis technology to the recovery of liquid hydrocarbons from biomass solid wastes. A fixed-bed Fire-Tube heating pyrolysis reactor system has been designed and fabricated considering all of the process parameters and present engineers challenge. The available agricultural waste-jute stick in Bangladesh has been pyrolyzed in the internally heated Fire-Tube heating reactor system under N2 atmosphere. The effects of operating temperature on the yields of product liquids were investigated. Characterization of the whole pyrolysis liquids obtained at optimum operating conditions has been carried out including physical properties, elemental analyses and GCV. The results show that fixed-bed Fire-Tube heating pyrolysis is a good option to obtain bio-oils from biomass solid wastes.

  • Fire-Tube Heating Pyrolysis of Car Tire Wastes: End Uses of Product Liquids as Fuels and Chemicals
    International Energy Journal, 2008
    Co-Authors: Mohammad Rofiqul Islam, K.s. Il, Hiroyuki Haniu
    Abstract:

    Car tire wastes were pyrolysed in a fixed-bed Fire-Tube heating reactor system under nitrogen to determine the effect of final temperature, feed size and sweeping gas flow rate on the product yields and liquid product compositions. The highest liquid product yield was obtained at 475 o C for feed size of 4cm 3 and sweeping gas flow rate of 8L/min. Liquid products were characterized including fuel properties, elemental analyses, FT-IR, 1 H-NMR, GC-MS and distillation. The analytical results showed that the tire derived liquids are a complex mixture of C 5 –C 17 organic compounds, with a lot of valuable single ring alkyl-aromatics (23.12%), a high value light hydrocarbon, limonene (11.11%), long-chain (including small amount of ring) hydrocarbons (30.94%) and oxygenated compounds (2.89%). The fuel properties and distillation data represent that the total pyrolytic liquid can be used as liquid fuel.

  • Fixed-bed Fire-Tube heating pyrolysis of solid tire wastes available in Bangladesh for the production of liquid fuels and chemicals
    2008
    Co-Authors: Mohammad Rofiqul Islam
    Abstract:

    The conversion of bicycle/rickshaw, motorcycle, passenger car and truck tire wastes, which are found in abundance in Bangladesh as well as all over the world, into liquid fuels and chemicals by fixed-bed FireTube heating pyrolysis technology has been taken into consideration in this study. The solid tire wastes were characterized through proximate and ultimate analysis, gross calorific values and thermogravimetric analysis to investigate their suitability as feedstock for this consideration. Pyrolysis kinetics of the selected tire wastes have been investigated thermogravimetrically under nitrogen atmosphere at heating rates of 10 and 60°C/min over a temperature range of 30-800°C. The percentage weight loss was higher for truck tire and was lower for bicycle/rickshaw tire for both heating rates. An overall rate equation for the tire wastes has been modeled satisfactorily by one simplified equation from which the kinetic parameters of unreacted materials based on Arrhenius form can be determined. The predicted rate equation was found to fit the measured TG and DTG data fairly well. DTA curves for all of the samples show that the degradation reactions are three main exotherms and one endotherm. Two types of fluid dynamics experiments were carried out on a cold model of the f ixed-bed f ire-Tube heating reactor: f irst to determine the char ejection pressure, which was conducted with the aid of an air compressor and artificial solid char while second to determine flow pattern in the reactor chamber during the ejection of solid char that was conducted by LDV measurement and flow visualization test. For complete removal of char product from the reactor, the ejection pressure should be sufficient enough to create 9% higher upward force than the weight of the char. The spiral shaped char exit port was unable to initiate a rotational flow inside the reactor during ejection of char. Four types of tire wastes were pyrolysed in the fixed-bed Fire-Tube heating reactor under different pyrolysis conditions to determine the role of f inal Fixed-bed Fire-Tube Heating Pyrolysis of Solid Tire Wastes Available in Bangladesh for the Production of Liquid Fuels and Chemicals

Hiroyuki Haniu - One of the best experts on this subject based on the ideXlab platform.

  • properties of sugarcane waste derived bio oils obtained by fixed bed Fire Tube heating pyrolysis
    Bioresource Technology, 2010
    Co-Authors: Mohammad Rofiqul Islam, Momtaz Parveen, Hiroyuki Haniu
    Abstract:

    Abstract Agricultural waste in the form of sugarcane bagasse was pyrolyzed in a fixed-bed Fire-Tube heating reactor under different pyrolysis conditions to determine the role of final temperature, sweeping gas flow rate and feed size on the product yields. Final temperature range studied was between 375 and 575 °C and the highest liquid product yield was obtained at 475 °C. Liquid products obtained under the most suitable conditions were characterized by physical properties, elemental analysis, GCV, FT-IR, 1 H NMR analysis and distillation. The empirical formula of the bio-oil with heating value of 23.5 MJ/kg was established as CH 1.68 O 0.557 N 0.012 . Comparison with other approaches showed that the liquid product yield by this simpler reactor system was higher with better physico-chemical properties as fuel. These findings show that fixed-bed Fire-Tube heating pyrolysis is a good option for production of bio-oils from biomass solid wastes.

  • Technology development for bio-crude oil from pyrolysis of renewable biomass resource
    2009 1st International Conference on the Developements in Renewable Energy Technology (ICDRET), 2009
    Co-Authors: Mohammad Rofiqul Islam, Momtaz Parveen, Md. Rabiul Islam, Hiroyuki Haniu
    Abstract:

    The objective of this study is to provide an innovation in pyrolysis technology to the recovery of liquid hydrocarbons from biomass solid wastes. A fixed-bed Fire-Tube heating pyrolysis reactor system has been designed and fabricated considering all of the process parameters and present engineers challenge. The available agricultural waste-jute stick in Bangladesh has been pyrolyzed in the internally heated Fire-Tube heating reactor system under N2 atmosphere. The effects of operating temperature on the yields of product liquids were investigated. Characterization of the whole pyrolysis liquids obtained at optimum operating conditions has been carried out including physical properties, elemental analyses and GCV. The results show that fixed-bed Fire-Tube heating pyrolysis is a good option to obtain bio-oils from biomass solid wastes.

  • Fire-Tube Heating Pyrolysis of Car Tire Wastes: End Uses of Product Liquids as Fuels and Chemicals
    International Energy Journal, 2008
    Co-Authors: Mohammad Rofiqul Islam, K.s. Il, Hiroyuki Haniu
    Abstract:

    Car tire wastes were pyrolysed in a fixed-bed Fire-Tube heating reactor system under nitrogen to determine the effect of final temperature, feed size and sweeping gas flow rate on the product yields and liquid product compositions. The highest liquid product yield was obtained at 475 o C for feed size of 4cm 3 and sweeping gas flow rate of 8L/min. Liquid products were characterized including fuel properties, elemental analyses, FT-IR, 1 H-NMR, GC-MS and distillation. The analytical results showed that the tire derived liquids are a complex mixture of C 5 –C 17 organic compounds, with a lot of valuable single ring alkyl-aromatics (23.12%), a high value light hydrocarbon, limonene (11.11%), long-chain (including small amount of ring) hydrocarbons (30.94%) and oxygenated compounds (2.89%). The fuel properties and distillation data represent that the total pyrolytic liquid can be used as liquid fuel.

R Bahrampoury - One of the best experts on this subject based on the ideXlab platform.

  • optimization of Fire Tube heat recovery steam generators for cogeneration plants through genetic algorithm
    Applied Thermal Engineering, 2010
    Co-Authors: Ali Behbahaninia, Mahmood Bagheri, R Bahrampoury
    Abstract:

    Abstract In the present paper, a small cogeneration system including a gas microturbine and a Fire Tube heat recovery steam generator (HRSG) is considered. The HRSG system is optimized considering two different objective functions. Sum of the exergy losses resulting from the gases leaving the stack and the exergy destruction due to the internal irreversibility is considered as the first objective function while the second objective function is considered to be the sum of annualized values of the capital cost and the cost of the energy loss. The cost of energy loss includes the cost of the loss by hot gases leaving the stack and the cost of the reduction in the power production in the microturbine as the result of the pressure drop in the HRSG. Finally multi-objective optimization method via genetic algorithm is employed to find the optimum values of the design parameters. A decision making process based on finding the closest point to the ideal point is used. Results of different optimum points on the Pareto front are compared and discussed. The results show that the thermodynamic optimization doesn’t lead to major improvement of the total cost of the HRSG although the thermoeconomic and multi-objective methods improve the total cost of the system due decrease in the cost of energy loss due to decrease in the pinch point.

S A Khaustov - One of the best experts on this subject based on the ideXlab platform.

  • The Numerical Simulation Application for Fire-Tube Boiler Heating Surface Safety Evaluation
    MATEC Web of Conferences, 2016
    Co-Authors: S A Khaustov, Artem Lisenkov
    Abstract:

    The numerical simulation is applied for Fire-Tube boiler heating surface safety estimation. Thermal processes in an inflatable Fire-Tube furnace during its emergency operation were simulated using the finite volume method with Euler approximation and the implicit pressure based algorithm. Study results reproduce failures connected with increasing of impasse aerodynamic resistance. The method of these failures prediction is suggested. Simulation has shown that entering the amount of coolant into combustion volume results in burner fan incapability to overcome the impasse resistance of the furnace. The simulation results are visually confirmed during the inspection of emergency boilers.

  • Computer-aided simulation of Fire-Tube boiler emergency operation
    2016 11th International Forum on Strategic Technology (IFOST), 2016
    Co-Authors: S A Khaustov, Y. A. Belousova, K. V. Buvakov, A. Y. Dolgih, R. N. Kulesh
    Abstract:

    Physical processes in an inflatable furnace during the emergency operation mode of Fire-Tube boiler were simulated using the ANSYS Multiphysics 12.1.4 engineering software. Finite volume method and Euler method were used in conjunction with the implicit Pressure Based algorithm. Study results can diagnose and predict boiler failures connected with increasing of impasse aerodynamic resistance. Simulation has shown that entering the amount of coolant into combustion volume results in fan inability to overcome the resistance of the boiler duct. The accuracy of the simulation results is confirmed by visual inspection of emergency boilers. Results shown in graphs can significantly expand on existing concepts of reversing flame aerodynamics.

  • Researching the Performance of Dual-Chamber Fire-Tube Boiler Furnace
    MATEC Web of Conferences, 2015
    Co-Authors: S A Khaustov, Yana Belousova
    Abstract:

    Autonomous heating systems equipped with Fire-Tube or shell boilers show high effectiveness, consistent performance and great technical parameters. But there is a significant limitation of its thermal productivity due to the complexity of durable large diameter Fire-Tube bottoms implementation. Optimization of combustion aerodynamics can be the way to expand the Fire-Tube boilers performance limit. In this case lots of problems connected with reducing emissions of toxic substances, providing of burning stability, local heat stresses and aerodynamic resistances should be solved. To resolve the indicated problems, a modified model of dual-chamber Fire-Tube boiler furnace is proposed. The performance of suggested flame-Tube was simulated using the proven computer-aided engineering software ANSYS Multiphysics. Results display proposed flame Tube completely filled with moving medium without stagnant zones. Turbulent vortical combustion is observed even with the straight-through fuel supply. Active flue gas recirculation in suggested dual-chamber furnace reduces emissions of pollutants. Diminution of wall heat fluxes allows boiler operation at lower water treatment costs.

  • computer simulation of the Fire Tube boiler hydrodynamics
    European Physical Journal Web of Conferences, 2015
    Co-Authors: S A Khaustov, A S Zavorin, Konstantin V Buvakov, Vyacheslav A Sheikin
    Abstract:

    Finite element method was used for simulating the hydrodynamics of Fire-Tube boiler with the ANSYS Fluent 12.1.4 engineering simulation software. Hydrodynamic structure and volumetric temperature distribution were calculated. The results are presented in graphical form. Complete geometric model of the Fire-Tube boiler based on boiler drawings was considered. Obtained results are suitable for qualitative analysis of hydrodynamics and singularities identification in Fire-Tube boiler water shell.

  • computer simulation of vortex combustion processes in Fire Tube boilers
    EPJ Web of Conferences, 2015
    Co-Authors: S A Khaustov, A S Zavorin, Konstantin V Buvakov, Lidiya D Kudryashova, Anastasiya V Tshelkunova
    Abstract:

    The article describes computer simulation of the turbulent methane-air combustion in a Fire-Tube boiler furnace. Computer simulations performed for variants of once-through Fire-Tube furnace and reversive flame furnace. Options with various twist parameters of the fuel-air jet were examined. The flame structure has been determined computationally, contours of average speed, temperature and concentrations have been acquired. The results of calculations are presented in graphical form. Dependence of construction characteristics on vortex aerodynamic parameters was estimated. Turbulent combustion of natural gas in the reverse flame of Fire-Tube boiler was studied by means of the ANSYS Fluent 12.1.4 engineering simulation software.

Behzad Najafi - One of the best experts on this subject based on the ideXlab platform.

  • dynamic modelling and optimal sizing of industrial Fire Tube boilers for various demand profiles
    Applied Thermal Engineering, 2018
    Co-Authors: Marco Tognoli, Behzad Najafi, Fabio Rinaldi
    Abstract:

    Abstract In the present paper, a detailed dynamic model of an industrial Fire-Tube boiler is first developed and five different geometrical configurations, each of which corresponds to a boiler model, are considered. Next, a PID controller is implemented and tuned for each configuration aiming at controlling the steam pressure, while addressing a demand with a variable flow rate. The operation of the developed boiler models, while providing four different steam demand profiles, are next simulated. The resulting cumulative average efficiency along with the cumulative pressure deviations and minimum and maximum pressure levels, which are achieved in each simulation, are then determined. The obtained results provide practical information regarding the trade-off between the size of the boiler and its corresponding performance and controllability. As an instance, the obtained results demonstrated that utilizing a boiler with the heat transfer surface of 36.76 m2 instead of one with the corresponding surface of 56.55 m2, in the worst-case scenario, leads to less than 2% of reduction in the efficiency and a negligible increment in the amplitude of pressure deviations. However, the former boiler is considerably smaller than the latter one and the mentioned choice can result in a significant saving in the required initial investment. Detailed information regarding the resulting pressure deviations has also been provided in order to facilitate verifying the consistency of the variations in each boiler’s supplied steam pressure with the corresponding acceptable range specified by the customer. Therefore, the provided results offer useful insights about the possible saving opportunities for small-medium scale industries, specifically in Italy, which are commonly employing oversized boilers with an On/Off control systems.

  • Multi-objective optimization of a Fire-Tube heat recovery steam generator system
    2009 IEEE Electrical Power & Energy Conference (EPEC), 2009
    Co-Authors: Hamidreza Najafi, Behzad Najafi
    Abstract:

    In the present paper, a Fire-Tube heat recovery steam generator (HRSG) system (including evaporator, superheater and economizer) have been considered and multi-objective optimization using genetic algorithm is applied in order to obtain optimum design parameters which yield the maximum Second law efficiency and the least capital cost. Geometric variables including number of Tubes in a row, Tube length and diameter, transverse pitch of each section and pinch point difference as the thermodynamic variable are considered as optimization parameters. The study was performed via MATLAB to develop model equations and implementing optimization.