Imorb, Karittha

Preferred name

Imorb, Karittha

Alternative Name

Im-orb, Karittha

Im-Orb, Karittha

Im-orb, K.

Main Affiliation

School of Food Industry

karittha.im@kmitl.ac.th

Now showing 1 - 10 of 14

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Design and evaluation of the sorption enhanced steam reforming and solid oxide fuel cell integrated system with anode exhaust gas recirculation for combined heat and power generation
(2017-01-01)
Wiranarongkorn, Kunlanan
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Im-Orb, Karittha
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Ponpesh, Pimporn
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Patcharavorachot, Yaneeporn
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Arpornwichanop, Amornchai
Solid oxide fuel cell (SOFC) is an electrochemical device for power generation with high efficiency and low environmental impact. Due to a high-temperature operation of SOFC, useful heat can be recovered to enhance its system efficiency. Regarding the environmental concern, bio-oil, the renewable liquid fuel, can be applied to SOFC system. In this study, the SOFC integrated with a steam reforming of bio-oil is considered. A sorption enhanced reforming process is studied for the production of high purity hydrogen for SOFC, and the anode gas recirculation in the SOFC system is proposed for the system improvement. Modeling of such an integrated process is performed using Aspen Plus simulator. As heat and power are generated from the SOFC system, the effect of key design parameters; fuel utilization and recirculation ratio of the anode gas, on a heatto-power ratio is analyzed. The system performance regarding to the electrical and thermal efficiencies is also evaluated. The results show that increasing the anode recirculation ratio increases the combined heat and power (CHP) performance, but increasing the fuel utilization decreases the thermal efficiency. It is also found that the appropriate range of heat-to-power ratio of the system varies from 0.24 to 0.89.
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Exergy and exergoeconomic analyses of sustainable furfural production via reactive distillation
(2021-07-01)
Wiranarongkorn, Kunlanan
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Im-orb, Karittha
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Panpranot, Joongjai
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Maréchal, François
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Arpornwichanop, Amornchai
Lignocellulosic biomass is a potential renewable resource for production of high-value, sustainable products. Furfural is among the important bio-based chemicals in biorefineries. However, the conventional process of furfural production using a reaction-separation network entails low product yield but high fixed and operating costs owing to the complex process of separation. In this study, a process of furfural production via reactive distillation (RD) was investigated and designed based on the concept of process intensification. Exergy and exergoeconomic analyses were applied to evaluate the process performance. When the RD column was operated at its optimal configuration, furfural production of 81.78 kg h−1 was achieved with xylose conversion and furfural yield of 97.9% and 97.4%, respectively. The exergy efficiency of furfural production was 56.41%, while the RD column exhibited the maximum exergy destruction rate among all components with an exergy efficiency of 69.82%. The exergy destruction rate declined with decrease in the reboiler duty of the RD column and increase in xylose concentration. The exergoeconomic analysis revealed that decreasing the reboiler duty had the highest impact on the total cost of furfural production. Decreases in feedstock and catalyst costs as well as interest rate additionally lowered the total cost rate of the system.
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A Review on the Technical and Economic Prospects of Biofuel Production from Integrated Biomass Gasification and Fischer-Tropsch Processes
(2020-01-01)
Im-orb, Karittha
;
Arpornwichanop, Amornchai
Concerns in energy shortage and the impact of greenhouse gas emissions motivate the production of transportation fuel via a combined biomass gasification (BG) and Fischer-Tropsch (FT) process. This review explains the basic background of the BG-FT process, including the gasification, gas cleaning, and FT processes. Numerous aspects of this process, such as the influence of the feedstock type and characteristics and the processing conditions, efficient process design, and FT-catalyst performance improvement, are reviewed based on laboratory-scale research reported in the literature. The tar removal process used to produce the synthesis gas satisfying the FT specification is also focused in this review. Moreover, the technical and economic prospects of the current BG-FT process to produce transportation fuels are reviewed and compared. Finally, trends in the future research of the BG-FT process are examined.
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Process and sustainability analyses of the integrated biomass pyrolysis, gasification, and methanol synthesis process for methanol production
(2020-02-15)
Im-orb, Karittha
;
Arpornwichanop, Amornchai
Technical and sustainability analyses of the methanol production via the integrated biomass pyrolysis, gasification, and methanol synthesis (IBPGM) process using rice straw as feedstock, are performed. The utilization of emitted CO<inf>2</inf> by recycling to a gasifier as a gasifying agent is investigated for technical and environmental reasons. The effects of CO<inf>2</inf> recirculation on the product distribution and energy consumption of the IBPGM process are examined. The production rate of methanol is improved with the increased CO<inf>2</inf> recycle fraction, while that of bio-oil does not change. The IBPGM is a highly exothermic process, with the largest energy-releasing unit being the methanol reactor. The energy consumption at the gasifier exhibits the same trend and thermal self-sufficiency is consequently achieved when the recycle fraction is raised to 0.76. Environmental assessment using a life cycle analysis tool reveals that the energy management of methanol synthesis unit and syngas processor needs to be improved as they highly contribute toward the carbon footprint and potential environmental impact. The technical and environmental factors of the IBPGM process are evaluated by the analysis hierarchy process, calculated by a multi-criteria decision analysis method. The IBPGM process with the CO<inf>2</inf> recycle fraction of 0.2 offers the best performance. Under this condition, the methanol and bio-oil production rates of 0.23 and 0.09 kmol h−1, respectively, and the energy efficiency of 60.7% can be achieved, based on the biomass feed rate of 1 kmol h−1.
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Bio-methanol production from oil palm residues: A thermodynamic analysis
(2020-12-15)
Im-orb, Karittha
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Phan, Anh N.
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Arpornwichanop, Amornchai
The thermodynamic analysis of bio-methanol production from oil palm residues was performed using a process model developed in Aspen Plus. Among the different types of oil palm residues, i.e., trunk, frond, and empty fruit bunch, the trunk residue offers the highest synthesis gas (syngas) (H<inf>2</inf> and CO) yields via the gasification process; therefore, it was selected as the biomass model compound. The effect of gasification operating conditions on the syngas composition, yield, bio-methanol production, energy consumption, and exergy performance was examined. The yield of syngas increased with increasing gasifying temperature, whereas that of bio-methanol exhibited the opposite trend due to the decrease in H<inf>2</inf> concentration of the syngas. The gasifier was an important unit for enhancing the exergy efficiency of the system, which was decreased when the equivalent ratio (ER) and gasifying temperature increased. Recirculating pressure swing adsorption offgas to the gasifier did not benefit bio-methanol production, nor did it improve energy and exergy performance. The maximum yield of bio-methanol was achieved by a once-through process that maintained the gasifying temperature at 750 °C and ER at 0.25. Under these conditions, the maximum energy and exergy efficiencies were 38.57 and 25.44%, respectively.
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Assessment and analysis of multi-biomass fuels for sustainable electricity generation
(2021-12-01)
Wiranarongkorn, Kunlanan
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Phajam, Picharporn
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Im-orb, Karittha
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Saebea, Dang
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Arpornwichanop, Amornchai
Many biomass power plants are not flexible, using only one fuel type, and have high CO<inf>2</inf> emissions. In this study, a new methodology to assess the multi-biomass utilization for a power plant is proposed. The results provide that the proportions of mixed biomass residues in different regions of Thailand are appropriate with lower chloride content and slagging inclination than the standard specification. However, high alkali metal oxides in biomass in the southern region lead to high fouling inclination with high fly ash deposition. The electricity production using multi-biomass fuel is more efficient with lower fuel consumption than that with single-type biomass. To generate 103.43 MW electricity production, 107.89 t h−1 consumption of mixed biomass fuels in the central is lower than that with multi-biomass in other regions. However, it generates a maximum of 12.5 mol% CO<inf>2</inf> in exhaust gases which can be captured by suitable amine-based absorbents with 90.82% efficiency.
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Process analysis of an integrated gasification and methanol synthesis process for bio-methanol production from untreated and torrefied biomass
(2021-01-01)
Im-Orb, Karittha
;
Arpornwichanop, Amornchai
The integrated biomass gasification and methanol synthesis process is investigated in this study. The different types of biomass i.e., the untreated and torrefied biomass at 250 oC (TB250) and torrefied biomass at 300 oC (TB300) are considered feedstock. The influence of torrefying temperature on the yield and composition of raw syngas derived gasifier is investigated. The biomass processed torrefaction leads to an increase in syngas and methanol yields. Moreover, the bio-methanol production process using torrefied biomass releases lower amount of CO2 than the raw one. An energy analysis is also performed using overall energy consumption and cold gas efficiency (CGE) of the integrated process as the indicators. The TB300 offers better performance in methanol production and CO2 emission. However, it requires high energy for methanol synthesis unit and offers low CGE.
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Process intensification approach for design and optimization of biodiesel production from palm fatty acid distillate
(2021-06-01)
Im-orb, Karittha
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Arpornwichanop, Amornchai
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Simasatitkul, Lida
Design of the biodiesel production from palm fatty acid distillate (PFAD) using process intensification approach is studied in technical, economic and environmental view points. Firstly, the transport phenomena analysis is performed to select the suitable intensified unit. The reactive distillation is selected and used in esterification – transesterification process and hydrolysis – esterification process. The optimum condition of reactive distillation in esterification – transesterification is achieved when the methanol is fed at the 3rd stage of the 4-stage column and the liquid holdup is maintained at 6 m3. The intensified esterification – transesterification process offers higher biodiesel yield and consumes less energy compared with the intensified hydrolysis – esterification process. The economic analysis shows that the intensified esterification-transesterification process is found to be economically feasible. Finally, environment assessment based on life cycle analysis (LCA) indicates that the environmental impact of both processes are similar.
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Flowsheet-based model and exergy analysis of solid oxide electrolysis cells for clean hydrogen production
(2018-01-01)
Im-orb, Karittha
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Visitdumrongkul, Nuttawut
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Saebea, Dang
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Patcharavorachot, Yaneeporn
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Arpornwichanop, Amornchai
A solid oxide electrolysis cell (SOEC) is an electrochemical technology used for hydrogen production via a steam electrolysis reaction. Because the existing SOEC models are complicated, the aim of this study is to develop a user-friendly SOEC model in a flowsheet simulator (Aspen Plus). The developed model is used to perform a parametric analysis to investigate the effects of key process parameters, i.e., operating temperature, current density, steam concentration, sweep gas type and number of cells, on the SOEC performance. The simulation results show that the voltage and the overall overpotential decrease as the cell temperature increases, whereas the opposite trends are observed when the current density increases. From the energy and exergy analyses, the total energy demand slightly increases with cell temperature, whereas the electrical energy demand decreases. Based on an operating temperature of 1273 K when the SOEC uses oxygen as the sweep gas, the highest energy and exergetic efficiencies of 78.45% and 92.20% are achieved at a current density of 2500 A m−2 and at a steam concentration of 90% in a 500-cell stack.
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Analysis of the sorption-enhanced chemical looping biomass gasification process: Performance assessment and optimization through design of experiment approach
(2020-09-15)
Detchusananard, Thanaphorn
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Im-orb, Karittha
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Maréchal, François
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Arpornwichanop, Amornchai
In this study, the performance of high-purity hydrogen production through the sorption-enhanced chemical looping gasification (SECLG) process, involving a gasifier, calciner, and air reactor, was investigated. In this process, the biomass feedstock was wood residue, and steam, calcium oxide (CaO), and nickel oxide (NiO) were used as a gasifying agent, CO<inf>2</inf> sorbent, and oxygen carrier, respectively. First, the influences of key operational parameters (i.e., steam to carbon (S/C) molar ratio, gasifying temperature, and NiO to carbon (NiO/C) molar ratio) on product gas yields and net energy consumption of the process were studied. According to the first and second laws of thermodynamics, performance indicators of the SECLG process demonstrated that increases in energy and exergy efficiencies occurred with increases in S/C molar ratio and/or gasifying temperature. Then, mathematical models indicative of correlations between energy efficiency, exergy efficiency, and major operating parameters (e.g., S/C molar ratio and gasifying temperature) were developed through the design of experiment (DOE) method and used for process optimization. The optimal conditions offering maximum energy (70%) and exergy (56%) efficiencies were a S/C molar ratio of 4.5 and gasifying temperature of 700 °C, under which all reactors operated at thermal self-sufficient conditions.

Imorb, Karittha

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