Article Per Year (5 Year)
p-Index From 2020 - 2025
0.408
P-Index
This Author published in this journals
All Journal Journal of Engineering and Technological Sciences Indonesian Journal of Energy Journal of Social Research Journal of Engineering and Technological Sciences
Winny Wulandari, Winny
Department of Chemical Engineering, Faculty of Industrial Technology, Institut Teknologi Bandung, Jalan Ganesa 10, Bandung 40132,
Aerospace Engineering Humanities Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Social Sciences

Published : 4 Documents Claim Missing Document
Claim Missing Document
Check
Articles

Found 4 Documents
Search

 1 
Modified Two-Step Dimethyl Ether (DME) Synthesis Simulation from Indonesian Brown Coal Sasongko, Dwiwahju; Luthan, Abdurrahman Fadhlil Halim; Wulandari, Winny
Journal of Engineering and Technological Sciences Vol 48, No 3 (2016)
Publisher : ITB Journal Publisher, LPPM ITB

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (271.793 KB) | DOI: 10.5614/j.eng.technol.sci.2016.48.3.6

Abstract

A theoretical study was conducted to investigate the performance of dimethyl ether (DME) synthesis from coal. This paper presents a model for two-step DME synthesis from brown coal represented by the following processes: drying, gasification, water-gas reaction, acid gas removal, and DME synthesis reactions. The results of the simulation suggest that a feedstock ratio of coal : oxygen : steam of 1 : 0.13 : 0.821 produces the highest DME concentration. The water-gas reactor simulation at a temperature of 400°C and a pressure of 20 bar gave the ratio of H2/CO closest to 2, the optimal value for two-step DME synthesis. As for the DME synthesis reactor simulation, high pressure and low temperature promote a high DME concentration. It is predicted that a temperature of 300°C and a pressure of 140 bar are the optimum conditions for the DME synthesis reaction. This study also showed that the DME concentration produced by the two-step route is higher than that produced by one-step DME synthesis, implying that further improvement and research are needed to apply two-step DME synthesis to production of this liquid fuel.
Model Validation of Biomass-Coal Blends Co-Pyrolysis to Produce Hybrid Coal Zahra, Aghietyas Choirun Az; Prasetyo, Hendi Aviano; Rizkiana, Jenny; Wulandari, Winny; Sasongko, Dwiwahju
Indonesian Journal of Energy Vol. 2 No. 2 (2019): Indonesian Journal of Energy
Publisher : Purnomo Yusgiantoro Center

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33116/ije.v2i2.41

Abstract

Co-pyrolysis of coal and biomass blend to produce hybrid coal has recently been experimentally studied by some previous researchers. For similar generated energy, a newly developed hybrid coal is claimed to be more environmentally friendly compared to the coal only due to the release of neutral CO2. To acquire a better understanding of co-pyrolysis of coal and biomass blend, an experiment had been carried out in a tubular furnace reactor. For this purpose, the blends of constant mass composition of 20 wt% sawdust and 80 wt% low-rank coal were used throughout the study. It was found from the experiment that approximately 42.1% carbon, and 1.6% of ash were produced from the co-pyrolysis blend. Then, a steady state simulation of co-pyrolysis was developed using Aspen Plus v8.8 to predict the hybrid coal carbon content and required heat to perform the co-pyrolysis. The model simulation showed that hybrid coal yielded 44.0% carbon, which was at 4.5% deviation from the experimental study. The model had also been successfully used to estimate heat required to produce hybrid coal. It predicted that the equivalent heat of 336.2 kW was required to produce hybrid coal from 1,000 kg/h blend feed. The heat generated by the modeling of sawdust biomass combustion for fuel purposes was also estimated to supply heat for endothermic co-pyrolysis. It was found that 1,000 kg/h sawdust was predicted to be equivalent to 371.4 kW. This suggests that for scaling up purpose, ratio of sawdust fuel to blend feed of 1:1.1 is sufficient for this process.
Investigating the Performance of a 50MW CFB Boiler in a Coal-Fired Power Plant through Co-Firing with Gamal Biomass and RDF Suryanugraha, Arifta; Saputera, Wibawa Hendra; Wulandari, Winny
Journal of Social Research Vol. 4 No. 7 (2025): Journal of Social Research
Publisher : International Journal Labs

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55324/josr.v4i7.2566

Abstract

The co-firing program at coal-fired power plants (CFPP) is part of PT PLN (Persero)’s short-term strategy to support Indonesia’s Net Zero Emission (NZE) target by 2060. Biomass and Refuse-Derived Fuel (RDF) are among the promising co-firing fuels. Biomass is considered carbon-neutral, while RDF helps reduce environmental waste. This study evaluates the technical effects of co-firing Gamal and RDF at blending percentages of 5%, 15%, and 30%, focusing on boiler performance and plant efficiency. SteamPRO software by Thermoflow was utilized to simulate and analyze the power plant’s thermodynamic performance under each co-firing condition. The simulations show that fuel specification or fuel composition and calorific value significantly affect key performance parameters. Co-firing with Gamal increases the Net Plant Heat Rate (NPHR) from 3034 kcal/kWh (baseline) to 3065, 3136, and 3264 kcal/kWh for 5%, 15%, and 30% co-firing, respectively. Plant efficiency correspondingly declines from 28.35% to 28.05%, 27.42%, and 26.35%. Boiler efficiency also drops from 83.69% to 82.98%, 81.47%, and 78.92%. RDF, in comparison, results in smaller deviations, with NPHR reaching only 3062 kcal/kWh and plant efficiency decreasing slightly to 28.08% at 30% co-firing. The lower calorific value of Gamal (2481 kcal/kg) increases the total fuel flow and raises auxiliary power consumption in the draught system, especially in the PA, SA, and ID fans, whereas RDF causes only minimal deviations. Emission results show that Gamal, with 0.07% sulfur, reduces SO? emissions from 0.474 to 0.4326 kg/MWh at 30% co-firing, while RDF increases it to 0.4905 kg/MWh due to higher sulfur content (0.42%). Uncorrected CO? emissions rise with Gamal but decrease after applying the carbon-neutral factor, from 984 to 730 kg/MWh at 30%. These results emphasize the importance of co-firing fuel specification selection and blending percentage optimization to balance performance and environmental outcomes.
Synthesis of Geopolymer from Ferronickel Aluminosilicate Waste Samadhi, Tjokorde Walmiki; Wulandari, Winny; Dwinidasari, Aya Anisa; Rahmasari, Arum
Journal of Engineering and Technological Sciences Vol. 57 No. 4 (2025): Vol. 57 No. 4 (2025): August
Publisher : Directorate for Research and Community Services, Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/j.eng.technol.sci.2025.57.4.1

Abstract

The nickel industry in Indonesia generates massive volumes of ferronickel slag that may harm the environment. This research evaluates the feasibility of utilizing coal fly ash and slag from a ferronickel smelter in Obi Island in Indonesia to synthesize geopolymer, an environmentally friendly cementitious material. Compressive strength of geopolymer mortars was measured as a function of slag particle size (coarse and fine), fly ash mass fraction in the dry aluminosilicate binder precursor blends (0.4 and 0.8), and thermal curing period (24 and 48 hours). Mortar specimens were produced by mixing ash and slag with activator solution and sand. The activator solution contained Na2SiO3 and NaOH at a mass ratio of 2:1. Solid reactants to activator solution mass ratio was 3.33. After heat curing, specimens were held in ambient conditions to an age of 7 days. The compressive strength of the mortars was in the 2.1-24.8 MPa range. Geopolymer mortars were able to comply to Indonesian SNI 15-2049-2004 or US ASTM C1329-05 standards for Portland cement. FTIR and XRD characterizations confirmed the conversion of fly ash and slag into amorphous geopolymers at near ambient temperature. Finer slag particle size increased reactivity, ultimately producing higher compressive strength.
Co-Authors Abdurrahman Fadhlil Halim Luthan, Abdurrahman Fadhlil Halim Dwinidasari, Aya Anisa Dwiwahju Sasongko Prasetyo, Hendi Aviano Rahmasari, Arum Rizkiana, Jenny Saputera, Wibawa Hendra Suryanugraha, Arifta Tjokorde Walmiki Samadhi Zahra, Aghietyas Choirun Az