Numerical Analysis on Wood Pyrolysis in Pre-Vacuum Chamber

Homma, Hiroki; Homma, Hiroomi; Idris, Muhammad

doi:10.4236/jsbs.2014.43014

Cited by 8 publications

(9 citation statements)

References 25 publications

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“…Most models use simplified kinetics mechanisms and simplified transport phenomena assumptions which sometimes make the models non-predictive. In some models, to reduce the mathematical complexity the solid devolatilization is described by assuming an infinitely fast reaction rate (Hiroki et al 2014) which introduces significant inaccuracies in design parameter prediction such as incorrect analysis of pyrolysis zone size and/or wrong prediction of the reaction front.…”

Section: Pyrolysis Modelling and Kineticsmentioning

confidence: 99%

Prospects of Pyrolysis Process and Models in Bioenergy Generation: a Comprehensive Review

Ndukwu

Horsfall

2020

Polytechnica

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Currently, renewable energy contributes to a very small percentage of most country's energy needs. Therefore it requires accelerated growth to meet the required goal of eliminating fossil fuel. Robust public strategies and political leadership are required to move forward, research, and technologies in renewable energy. Energy conservation through improvement in conversion efficiency is required and can be achieved by adopting pyrolysis technology. The application of pyrolysis in biomass decomposition for energy conversion can turn waste into wealth. Various works of literature and methods in the pyrolysis of carbonaceous feedstock were reviewed and presented. Available models and product yield mechanism was discussed.

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Section: Pyrolysis Modelling and Kineticsmentioning

confidence: 99%

Prospects of Pyrolysis Process and Models in Bioenergy Generation: a Comprehensive Review

Ndukwu

Horsfall

2020

Polytechnica

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“…Laju aliran massa uap (ṁ) secara teoritis merupakan kapasitas panas yang hilang selama terjadi perpindahan kalor secara konveksi berbanding dengan entalpi campuran pada kondisi jenuh pada temperature 80 O C, maka: m = (0.2752 kW)/(2308kJ/kg) = 1.192 x 10-4 kg/s. Hal ini menarik jika dibandingkan dengan penelitian yang telah dipublikasikan oleh (Homma, Homma, & Idris, 2014), pada proses pirolisis biomassa.…”

Section: Laju Aliran Massa Uap (ṁ)unclassified

Analisis Perpindahan Kalor Kondensor Pada Proses Distilasi Bioetanol Sebagai Biofuel Dari Campuran Limbah Buah Salak Dengan Limbah Air Kelapa

Hutasuhut

2018

JMEMME

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Cadangan bahan bakar fosil Indonesia akan segera habis. Indonesia harus segera melakukan inovasi dan temuan bahan bakar alternative untuk menggatikan bahan bakar fosil tersebut untuk menghindari krisis dan isu lingkungan. Biomassa sebagai salah satu sumber bahan bakar alternative yang tersedia dalam jumlah banyak di Indonesia. Melalui beberapa tahapan proses biomassa dapat dirubah menjadi bahan bakar bioethanol. Salah satu proses yang dimaksud dengan cara termokimia yaitu distilasi. Distilasi merupakan proses pemisahan fasa berdasarkan titik didih fasa itu sendiri. Uap mengalir dalam pipa masuk ke dalam kondensor dengan ukuran Ø 8.89x10-2 m dan panjang L 3.4 x10-2. Didalam kondesnor terjadi perpindahan panas secara konveksi. Perbedaan temperature pada proses kondensasi antara fluida uap yang mengalir dalam pipa dengan fluida air pendingin yang mendinginkan dinding kondesor direkam menggunakan perankat akuisisi. Oleh karena itu, penelitian ini bertujuan untuk menganalisis perpindahan panas konveksi pada kondensor dan mengitung hasil luaran bioethanol secara teoritis berdasarkan massa kondensat uap fermentor. Dari hasil analisis diperoleh perpindahan panas konveksi sebesar 0.2752 kW. Laju massa uap fermentor 1.192 x 10-4 kg/s, koefisien perpindahan kalor kondensasi 340.7161 W/m2 OC, laju massa kondensat 1.01x 10-5 kg/s. Laju massa kondensat yang diperoleh 8% merupakan hasil luaran biofuel atau bioethanol. AbstractIndonesia's fossil fuel reserves will soon run out. Indonesia must immediately innovate and search alternative fuels to replace fossil fuels to avoid crises and environmental issues. Biomass as one of the alternative sources of fuel available in large quantities in Indonesia. Through several stages, the process of biomass can be converted into bioethanol fuel. One of the processes referred to by thermochemical methods is distillation. Distillation is a phase separation process based on the boiling point itself. Steam flows in the pipe into the condenser with a size of Ø 8.89x10-2 m and length L 3.4 x10-2. In the condenser, there is convection heat transfer. The temperature difference in the condensation process between the vapor fluid flowing in the pipe and the cooling water fluid that cools the condenser wall is recorded using the acquisition role. Therefore, this study aims to analyze the convection heat transfer in the condenser and to calculate the bioethanol output theoretically based on the mass of the fermentor vapor condensate. From the analysis results obtained convection heat transfer of 0.2752 kW. The fermentor vapor mass rate is 1,192 x 10-4 kg / s, the condensation heat transfer coefficient is 340.7161 W / m2 OC, the condensate mass rate is 1.01x 10-5 kg / s. The condensate mass rate obtained by 8% is the result of biofuel or bioethanol output.

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“…We suppose that convection and radiation does not affect significantly temperature inside the chamber, because the chamber is in vacuum and high temperature part of a chamber inside is covered by wood pieces. Slightly different from the research that's been published in Figure 3.2 [5], numerical calculations carried out until the time reaches 1304 seconds, where the lowest temperature was 299 K and the highest temperature reached 661 K. Analysis of numeric assessed on the basis of chemical reactions using ANSYS Fluent. Decomposition of the wooden components turn into steam to steam occurs after 890 seconds.…”

Section: Heating Condition Of Wood Stove Furnacementioning

confidence: 99%

“…The large wood pyrolysis in the pre vacuum chamber is too complicated. The two-step general reaction model was purposed for the numerical analysis [5] …”

Section: Numerical Analysis Of Pyrolysismentioning

confidence: 99%

Numerical Approach to Wood Pyrolysis in Considerating Heat Transfer in Reactor Chamber

Idris

Novalia

2017

IOP Conf. Ser.: Mater. Sci. Eng.

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Abstract. Pyrolysis is the decomposition process of solid biomass into gas, tar and charcoal through thermochemical methods. The composition of biomass consists of cellulose hemi cellulose and lignin, which each will decompose at different temperatures. Currently pyrolysis has again become an important topic to be discussed. Many researchers make and install the pyrolysis reactor to convert biomass waste into clean energy hardware that can be used to help supply energy that has a crisis. Additionally the clean energy derived from biomass waste is a renewable energy, in addition to abundant source also reduce exhaust emissions of fossil energy that causes global warming. Pyrolysis is a method that has long been known by humans, but until now little is known about the phenomenon of the pyrolysis process that occurs in the reactor. One of the Pyrolysis's phenomena is the heat transfer process from the temperature of the heat source in the reactor and heat the solid waste of biomass. The solid waste of biomass question in this research is rubber wood obtained from one of the company's home furnishings. Therefore, this study aimed to describe the process of heat transfer in the reactor during the process. ANSYS software was prepared to make the simulation of heat transfer phenomena at the pyrolysis reactor. That's the numerical calculation carried out for 1200 seconds. Comparison of temperature performed at T1, T2 and T3 to ensure that thermal conductivity is calculated by numerical accordance with experimental data. The distribution of temperature in the reactor chamber specifies the picture that excellent heat conduction effect of the wood near or attached to wooden components, cellulose, hemicellulose and lignin down into gas.

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Numerical Analysis on Wood Pyrolysis in Pre-Vacuum Chamber

Cited by 8 publications

References 25 publications

Prospects of Pyrolysis Process and Models in Bioenergy Generation: a Comprehensive Review

Prospects of Pyrolysis Process and Models in Bioenergy Generation: a Comprehensive Review

Analisis Perpindahan Kalor Kondensor Pada Proses Distilasi Bioetanol Sebagai Biofuel Dari Campuran Limbah Buah Salak Dengan Limbah Air Kelapa

Numerical Approach to Wood Pyrolysis in Considerating Heat Transfer in Reactor Chamber

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