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Author: search.filters.author.Supankanok, RasaHas files: No

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    Novel CO2-negative design of palm oil-based polygeneration systems
    (2023-02-01)
    Wu, Wei
    ;
    Supankanok, Rasa
    ;
    Chandra-Ambhorn, Walairat
    ;
    Taipabu, Muhammad Ikhsan
    A palm oil-based polygeneration system (POPS), which is a combination of a fixed bed hydrotreating reactor (FBHTR), a three-phase separator, and a series of cryogenic separators, is co-production process of green diesel and liquefied petroleum gas (LPG) named Design 1. The FBHTR model is validated by experiment data and its optimal operating parameters are determined by solving the response surface methodology-based optimization algorithm. Two CO<inf>2</inf>-negative designs for the POPS named Designs 2 and 3 adopt approaches of (i) the evacuated tube solar collector (ETSC) for reducing 35% flue gas from the furnace, (ii) the amine-based CO<inf>2</inf> capture process coupling with pre- or post-separation system for producing the high-purity CO<inf>2</inf> product, and (iii) the heat integration design for reducing the energy duties of hot/cold utilities. Design 2 is validated to achieve the maximum negative net CO<inf>2</inf> emissions. Design 3 not only ensures the negative net CO<inf>2</inf> emissions, but also it produces three high-purity products (98.3% green diesel, 100% LPG, and 99.9% CO<inf>2</inf>) simultaneously.
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    Process design and economic evaluation of biomass-based negative emission technologies
    (2023-01-01)
    Wu, Wei
    ;
    Supankanok, Rasa
    ;
    Chandra-Ambhorn, Walairat
    ;
    Pongboriboon, Nattapat
    A palm oil-based polygeneration system (POPS) is simulated to produce the main product of high-purity green diesel as well as the liquefied petroleum gas (LPG) as a by-product. The CO<inf>2</inf>-negative design includes approaches of (i) a series of cryogenic separators for the recovery of approximately 65.5% of hydrogen feedstock, (ii) the evacuated tube solar collector (ETSC) for reducing 35% flue gas from the furnace, (iii) the amine-based CO<inf>2</inf> capture process for pursuing the high-purity CO<inf>2</inf> product. The economic analysis of POPS shows that the process becomes economically attractive if the diesel price and crude palm oil should be around 1.98 and 0.47 $kg<sup>-1</sup>, respectively.
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    Modification of a solar thermal collector to promote heat transfer inside an evacuated tube solar thermal absorbe
    (2021-05-01)
    Supankanok, Rasa
    ;
    Sriwong, Sukanpirom
    ;
    Ponpo, Phisan
    ;
    Wu, Wei
    ;
    Chandra-Ambhorn, Walairat
    Evacuated-tube solar collector (ETSC) is developed to achieve high heating medium temperature. Heat transfer fluid contained inside a copper heat pipe directly affects the heating medium temperature. A 10 mol% of ethylene-glycol in water is the heat transfer fluid in this system. The purpose of this study is to modify inner structure of the evacuated tube for promoting heat transfer through aluminum fin to the copper heat pipe by inserting stainless-steel scrubbers in the evacuated tube to increase heat conduction surface area. The experiment is set up to measure the temperature of heat transfer fluid at a heat pipe tip which is a heat exchange area between heat transfer fluid and heating medium. The vapor/ liquid equilibrium (VLE) theory is applied to investigate phase change behavior of the heat transfer fluid. Mathematical model validated with 6 experimental results is set up to investigate the performance of ETSC system and evaluate the feasibility of applying the modified ETSC in small-scale industries. The results indicate that the average temperature of heat transfer fluid in a modified tube increased to 160.32 °C which is higher than a standard tube by approximately 22 °C leading to the increase in its efficiency by 34.96%.