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3,476 results on '"Ong, Hwai Chyuan"'

108. A new strategy to design the purification process of ethyl tertiary butyl ether gasoline additive viahybrid extractive-reactive distillation

Author

Kong, Zong Yang, Sun, Shirui, Ang, Tiffany, Yang, Ao, Ong, Hwai Chyuan, and Sunarso, Jaka

Abstract

Here we propose a new strategy for designing the purification process of ethyl tertiary butyl ether (ETBE) gasoline additive. Our proposal suggests replacing the last two columns of the triple-column extractive distillation process from previous work with a single reactive distillation column. This column incorporates an ethylene oxide hydration reaction, yielding ethylene glycol, which can be utilized as a solvent for extractive distillation. This replacement is able to reduce the total number of columns, the amount of solvent needed, and significantly decreases total energy consumption up to 32 % compared to the original process. Furthermore, it benefits from the redistribution of energy between different steam-grade utilities, enabling significant reduction in operational costs. These advantages result in a 3−22 % cost decrease compared to the original process. Overall, the proposed process exhibits significant improvements in energy efficiency and cost reduction with respect to the original process with and without heat integration from previous research.

Published
2024
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129. Thermoexergetic analysis and response optimisation of selective exhaust gas recirculation with solvent-based CO2 capture in a natural gas-fired combined cycle power plant.

Author

Tang, Youning, Chong, Cheng Tung, Ng, Jo-Han, Herraiz, Laura, Li, Jia, Ong, Hwai Chyuan, Lam, Su Shiung, Tabatabaei, Meisam, and Chong, William Woei Fong

Subjects
GAS power plants, POWER plants, EXHAUST gas recirculation, COMBINED cycle power plants, THERMAL efficiency, COMBUSTION chambers, FLUE gases
Abstract

The present study investigates the impact of integrating selective exhaust gas recirculation (SEGR) with a combined cycle gas turbine system (CCGT) and post-combustion capture (PCC) in a model power plant. The impacts of ambient temperature, turbine inlet temperature (TIT), and pressure ratio (PR) on the overall thermal and exergetic efficiencies at component and system levels are evaluated. Results show that the combustion chamber and absorber are the two components with the largest exergy destructions in CCGT and PCC units, with a fraction of 44.8% and 52.9%, respectively. After integrating with SEGR, CO2 concentration in flue gas rises from 3.61 to 6.08%, whereas PCC exergetic efficiency increases by 6%. A design of experiments statistical model was applied through a full factorial design to optimise the responses of minimising total exergy destruction while maximising both the thermal and exergetic efficiencies. The optimised input set for TIT of 1300 °C, PR of 15, and SEGR recycle ratio of 25% leads to the best outcome of 415.08 MW, 56.53%, and 51.04% for total exergy destruction, thermal efficiency, and exergetic efficiency, respectively. The predictor equations produced have high degrees of correlation and predictive capabilities and could be used to form empirical equations to replace thermodynamic calculations entirely. [ABSTRACT FROM AUTHOR]

Published
2024
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