Frontiers in Renewable Energy最新文献

Gasification GASIFICATION OF ORGANIC WASTE IN UPDRAFT GASIFIER 在 UPDRAFT 气化机中气化有机废物

Frontiers in Renewable Energy Pub Date : 2023-12-01 DOI: 10.22146/free.v2i1.7006

Mhd Faisal Ain Lubis

{"title":"Gasification GASIFICATION OF ORGANIC WASTE IN UPDRAFT GASIFIER","authors":"Mhd Faisal Ain Lubis","doi":"10.22146/free.v2i1.7006","DOIUrl":"https://doi.org/10.22146/free.v2i1.7006","url":null,"abstract":"The majority of Indonesia's waste is organic and could potentially be converted to energy. The most effective method for converting waste into energy is gasification with updraft gasifier. Different types of waste are contained in organic waste, which has a high moisture content ranging from 16.95% to 53.74% collected from TPST Piyungan, Yogyakarta. The effect of moisture content which are categorized as low, medium, and high on operation time, fuel conversion rate and heating rate is the main thing observed in this study. The ideal value for the organic waste moisture content that can be obtained for a successful gasification operation is 15.68%. The operational time range of 61.57 to 193.69 minutes, with optimum value of 66.68 minutes, sehingga menghasilkan nilai FCR optimal sebesar 38,28 gram/menit dan nilai laju pemanasan dengan nilai berturut-turut untuk IH (Initial Heating Rate) 37,10 oC/menit dan MH (Maximum Heating Rate) 19,96 oC/menit. The desired product quantity in ideal conditions is 86% for gas, 8% for liquid, and 6% for solids. Based on the complete testing process, the quantity of gas products (55.31 to 88.65%), followed by liquid products (1.64 to 4.57%) and solids (9.71 to 40.12%).","PeriodicalId":120071,"journal":{"name":"Frontiers in Renewable Energy","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138623258","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Designing PEM Electrolysis-Based Hydrogen Reactors In The Area of Baron Beach Of Yogyakarta, Indonesia 在印尼日惹Baron海滩地区设计PEM电解氢反应器

Frontiers in Renewable Energy Pub Date : 2022-07-08 DOI: 10.22146/free.v1i1.3816

D. Nugroho, A. Budiman, E. Suyono, W. Wilopo

引用次数: 0

Sub-Regimes of Air-Water Slug Flow Characteristics in Horizontal Pipes by Liquid Hold-up Model Correlated to Bubble Behaviours (LHmBb) 基于气泡行为的液持模型的水平管道空气-水段塞流动特性子区

Frontiers in Renewable Energy Pub Date : 2022-07-08 DOI: 10.22146/free.v1i1.3472

Y. Prayitno, Okto Dinaryanto, Deendarlianto, Indarto

{"title":"Sub-Regimes of Air-Water Slug Flow Characteristics in Horizontal Pipes by Liquid Hold-up Model Correlated to Bubble Behaviours (LHmBb)","authors":"Y. Prayitno, Okto Dinaryanto, Deendarlianto, Indarto","doi":"10.22146/free.v1i1.3472","DOIUrl":"https://doi.org/10.22146/free.v1i1.3472","url":null,"abstract":"Sub-regimes of air-water slug flow in horizontal pipes have been characterized by a liquid hold-up model correlated to bubble behaviors (LHmBb). The LHmBB is composed of two sections which are the liquid hold-up model and bubble behavior investigations. The liquid hold-up model is developed based on the statistical analysis of the probability density function (PDF) to quantify the bubble distribution. The bubble behaviors are qualitatively investigated based on the high-speed camera and correlated to the quantified LH for the characterization of sub-regime of air-water slug flow. The LHmBB characterizes the sub-regime of air-water slug flow in a horizontal transparent acrylic pipe with an inner diameter of underwater and air superficial velocities of and, respectively. As a result, four sub-regimes are determined as Initially dispersed Bubbles (IdB), Low dispersed Bubbles (LdB), High dispersed Bubbles (HdB), and Dominantly dispersed Bubbles (DdB). The presence of bubbles determines the type of sub-regime by decreasing the number of bubbles and dispersing the bubbles mechanism. Moreover, the proposed LHmBb includes the correlation function to ease the prediction of the sub-regimes of air-water slug flow characteristics which leads to the enhancements of the two-phase flow pattern map in horizontal pipes.","PeriodicalId":120071,"journal":{"name":"Frontiers in Renewable Energy","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-07-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127032998","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Selection of Microalgae Harvesting Technology for Bio-crude Oil Production 生物原油生产微藻采收技术的选择

Frontiers in Renewable Energy Pub Date : 2022-07-08 DOI: 10.22146/free.v1i1.3847

Abdul Rozaq Albaqi, Nugroho Dewayanto, Eko Agus Suyono, Arief Budiman

{"title":"Selection of Microalgae Harvesting Technology for Bio-crude Oil Production","authors":"Abdul Rozaq Albaqi, Nugroho Dewayanto, Eko Agus Suyono, Arief Budiman","doi":"10.22146/free.v1i1.3847","DOIUrl":"https://doi.org/10.22146/free.v1i1.3847","url":null,"abstract":"Energy consumption of fossil fuel which keeps increasing has led to the urgency of research and development on the field of renewable energy for the future. Microalgae are considered to be the most promising new source of biomass compared with first and second-generation feedstocks. A great challenge is a choice of an effective approach for microalgae harvesting. Additional challenges of microalgae harvesting come from the small size of microalgae cells (3-30µm) and the similarity of the density of the microalgae cells to the growth medium. This research is aimed to determine the appropriate microalgae harvesting technology for bio-crude oil production. Several potential microalgae harvesting technologies are centrifugation, filtration, inorganic flocculation, organic flocculation, bioflocculation, electrocoagulation, and flocculation-sedimentation. The method used in this research is Analytic Hierarchy Process (AHP). The results indicate that the parameters taken into consideration are energy need (0.339), cost (0.214), risk of contamination (0.098), efficiency (0.133), technology availability (0.066), microalgae strain flexibility (0.079), and production time (0.071). In a case study, the pairwise comparison of seven alternatives each for the harvesting and seven criteria are compared. The best alternative that can be recommended as a microalgae harvesting technology is flocculation-sedimentation with a weight of 0.202.","PeriodicalId":120071,"journal":{"name":"Frontiers in Renewable Energy","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-07-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131093136","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Mathematical Modeling of Hydrodynamic Cavitation as Low Energy Extraction Technique for Lipid Removal from Nannochloropsis sp. 水动力空化低能量提取技术去除纳米绿藻脂质的数学建模。

Frontiers in Renewable Energy Pub Date : 2022-07-08 DOI: 10.22146/free.v1i1.3312

A. Budiman, Martomo Setyawan, Panut Mulyono, Sutijan, Razif Harun

{"title":"Mathematical Modeling of Hydrodynamic Cavitation as Low Energy Extraction Technique for Lipid Removal from Nannochloropsis sp.","authors":"A. Budiman, Martomo Setyawan, Panut Mulyono, Sutijan, Razif Harun","doi":"10.22146/free.v1i1.3312","DOIUrl":"https://doi.org/10.22146/free.v1i1.3312","url":null,"abstract":"Lipid extraction assisted by hydrodynamic cavitation (HCLE) is one of the promising processes with low energy requirements. This study aims to reduce the energy requirement using a discrete flow system and evaluate two models to calculate the volumetric mass transfer coefficient. The variations of the number of repetitions, cavitation number, microalgae concentration, and temperature have affected the energy requirement value. The first model uses total lipid mass transfer approximation (Model 1) and the second uses separated lipid mass transfer approximation (Model 2). Based on Model 1 the value of total volumetric mass transfer coefficient ( ) f were 1.166 x 10-2, 3.113 x 10-3 and 1.285 x 10-3 min-1 with coefficient of determination (R2) is 0.9797. Whereas, based on Model 2 the value of volumetric mass transfer coefficient from disrupted microalgae ( ) were 1.131 x 10-2, 2.925 x 10-3 and 1.260 x 10-3 min-1 and from the intact microalgae ( ) was 0.051, 0.030 and 0.011 1/min with R2 of 0.9766. Both models gave a similar result. It was shown that lipid release from disrupted microalgae was dominant compared to the intact microalgae. Therefore, the discrete flow system of HCLE is a promising technique for extracting lipids from microalgae","PeriodicalId":120071,"journal":{"name":"Frontiers in Renewable Energy","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-07-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131241354","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0