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Low Emission Power Plant Design Using R134a as Working Fluid Instead of Fossil Fuel to Mitigate Greenhouse Gas Effect

Simanjuntak Janter Pangaduan, Prayogo Wisnu

Ecological Engineering & Environmental Technology

2023

Vol. 24, iss. 5

231--237

This study investigates the potential of using R134a as a working fluid in a low-emission power plant instead of the conventional power plant to mitigate the greenhouse effect. The study explores the thermodynamic properties of R134a and its suitability for use in an Organic Rankine Cycle (ORC) power plant. A simulation model was developed using Aspen Hysys to evaluate the power plant’s performance using this working fluid. The results indicate that the ORC power plant can significantly reduce greenhouse gas emissions compared to conventional power plants while maintaining high energy efficiency. About 18.17 kW of electric power can be obtained at a working condition of 10 bar and an evaporator temperature of 130 °C with the highest thermal efficiency of 3.43%. The study provides valuable insights into the potential of R134a as a sustainable working fluid for low-emission power generation.

Air Separation Units (ASUs) Simulation Using Aspen Hysys® at Oxinor I of Air Liquid Chile S.A Plant

Leiva C.A, Poblete D.A., Aguilera T.L., Acuña C.A., Quintero F.J.

Polish Journal of Chemical Technology

2020

Vol. 22, nr 1

10--17

The method used to extract copper from its ores depends on the nature of the ore. The main process currently to separate copper from sulphide ores is the smelting process. The concentrated ore is heated strongly with silicon dioxide (silica), calcium carbonate and oxygen enriched air in a furnace or series of furnaces which is carried out using the injection of the air for oxidation the Fe and Si present in the raw material. Oxygen can be produced using several different methods. One of these methods is Air separation process, which separates atmospheric air into its primary components, typically nitrogen and oxygen, and sometimes also argon and other rare inert gases by cryogenic distillation. In this paper, simulation of air separation units (ASUs) was studied using Aspen Hysys®. The obtained simulation and model was validated with the operational data from the Oxinor I of Air Liquide S.A Plant. The ASU was divided into subsystems to perform the simulations. Each subsystem was validated separately and later on integrated into a single simulation. An absolute error of 1% and 1.5% was achieved between the simulated and observed the process variables(s). This indicated that Aspen Hysys® has the thermodynamic packages and required tools to perform simulations in cryogenic processes at industrial scale.