Renewable Energy最新文献_第6页

The thermo-mechanical impact of long-term energy pile use

IF 9 1区工程技术

Renewable Energy Pub Date : 2025-02-17 DOI: 10.1016/j.renene.2025.122693

Mouadh Rafai , Diana Salciarini , Philip J. Vardon

引用次数: 0

Heat and flow dynamics in biomass reactors under pyrolysis conditions: Computational insights

IF 9 1区工程技术

Renewable Energy Pub Date : 2025-02-17 DOI: 10.1016/j.renene.2025.122691

Mihai Rares Sandu , Dorin Boldor , Mircea Gabriel Macavei , Aneta Magdziarz , Cosmin Marculescu

{"title":"Heat and flow dynamics in biomass reactors under pyrolysis conditions: Computational insights","authors":"Mihai Rares Sandu , Dorin Boldor , Mircea Gabriel Macavei , Aneta Magdziarz , Cosmin Marculescu","doi":"10.1016/j.renene.2025.122691","DOIUrl":"10.1016/j.renene.2025.122691","url":null,"abstract":"<div><div>This study investigates the heat transfer and fluid flow phenomena in a tubular reactor designed for biomass pyrolysis, using both experimental and numerical methods. A comprehensive 3D Computational Fluid Dynamics (CFD) model was developed in COMSOL Multiphysics, incorporating the reactor geometry, operating parameters, and biomass properties to simulate thermal behavior. Experiments were conducted with chicken wing bones as feedstock, with temperatures monitored at three points along the reactor to validate the model. The simulations replicated experimental conditions, including nitrogen flow at 0.5 l/min and reactor wall temperature set at 550 °C.</div><div>The model accurately predicted temperature distributions and heat transfer within the reactor, with deviations below 5 % at steady-state. Results showed that thermal equilibrium was achieved at 960 s in the empty reactor and 1200 s in the reactor with biomass loaded at the center, with uniform temperatures of approximately 520–550 °C along the reactor. Axial and radial temperature uniformity was observed, though localized heat accumulation occurred in the reactor's middle section during early heating phases.</div><div>This research advances the predictive modeling of biomass pyrolysis by providing a validated tool for optimizing reactor design. These findings contribute to sustainable bioenergy technologies by improving reactor efficiency and enabling the effective utilization of organic feedstocks for bio-based products.</div></div>","PeriodicalId":419,"journal":{"name":"Renewable Energy","volume":"244 ","pages":"Article 122691"},"PeriodicalIF":9.0,"publicationDate":"2025-02-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143453856","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Evolutionary pathways of renewable power system considering low-carbon policies: An agent-based modelling approach

IF 9 1区工程技术

Renewable Energy Pub Date : 2025-02-17 DOI: 10.1016/j.renene.2025.122686

Conghao Zhao , Ming Zhou , Jian Li , Zhihang Fu , Dazheng Liu , Zhaoyuan Wu

{"title":"Evolutionary pathways of renewable power system considering low-carbon policies: An agent-based modelling approach","authors":"Conghao Zhao , Ming Zhou , Jian Li , Zhihang Fu , Dazheng Liu , Zhaoyuan Wu","doi":"10.1016/j.renene.2025.122686","DOIUrl":"10.1016/j.renene.2025.122686","url":null,"abstract":"<div><div>The proposed \"carbon neutrality\" goal necessitates a profound decarbonization of China's power system, which involves reshaping the traditional coal-dominated energy structure. The orderly phase-out of coal-fired generation units and the realization of safe and economic transformation of the power system are important challenges faced by the construction of low-carbon power systems. As China's electricity market reform advances, the design of low-carbon policies and the self-interested behaviour of various market players will critically influence the decarbonization process. This article proposes an agent-based modelling approach that embeds a renewable energy investment model and a coal-fired power decommissioning model in power generation companies. The impact of low-carbon synergistic policy design on renewable energy and coal-fired power is examined using a representative region of China as the measurement target. The results indicate that while low-carbon policies exhibit varying effects across different regions, they uniformly contribute to a reduction in carbon emission intensity. Additionally, the deep peak regulation compensation policy and energy storage inputs address the issue of diminished flexibility resulting from the gradual phase-out of coal-fired generation units. These policies are complementary and collectively facilitate China's transition to a safe and economic low-carbon energy system.</div></div>","PeriodicalId":419,"journal":{"name":"Renewable Energy","volume":"244 ","pages":"Article 122686"},"PeriodicalIF":9.0,"publicationDate":"2025-02-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143444342","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Ex-situ combined with in-situ catalytic pyrolysis: A strategic approach to enhancing furans production from biomass

IF 9 1区工程技术

Renewable Energy Pub Date : 2025-02-17 DOI: 10.1016/j.renene.2025.122697

Wang Dechao , Yang Xinyu , Huang Haihan , Wu Kaiyue , Zheng Jie , Yao quan , Lin Jian , Huang Yuanbo , Liu Peng , Wang Duo , Ye Yueyuan , Zheng Zhifeng

{"title":"Ex-situ combined with in-situ catalytic pyrolysis: A strategic approach to enhancing furans production from biomass","authors":"Wang Dechao , Yang Xinyu , Huang Haihan , Wu Kaiyue , Zheng Jie , Yao quan , Lin Jian , Huang Yuanbo , Liu Peng , Wang Duo , Ye Yueyuan , Zheng Zhifeng","doi":"10.1016/j.renene.2025.122697","DOIUrl":"10.1016/j.renene.2025.122697","url":null,"abstract":"<div><div>Biomass, as a renewable resource, holds great significance in its conversion into valuable chemicals or fuels, representing a crucial avenue for its utilization. Nevertheless, catalytic pyrolysis currently faces constraints, demanding further enhancements in both the selectivity of target products and the recyclability of catalysts. Herein, we reported an innovative in-situ combined with ex-situ catalytic pyrolysis strategy by using red mud loaded with cobalt (Co/RM) and activated carbon (AC) as the catalyst for this combined catalytic pyrolysis system. By optimization of process conditions, the selectivity of furans was further improved significantly. The results showed that with a combined catalytic system constituted of Co/RM and Co/RM + AC, under conditions of a pyrolysis temperature of 400 °C, a catalytic temperature of 500 °C, and a mass ratio of catalyst to raw material of 20:1, the selectivity of furans can be increased to 80.1 %. Remarkably, this combined catalytic system exhibits excellent catalytic activity for furans production even after 20 cycles of operation. Moreover, the established combined catalytic system is capable of converting tobacco, bamboo, and wood into furans with more than 100 % increasement. These results suggest that this novel strategy harbors broad application prospects and has the potential to catalyze more efficient exploitation of biomass resources.</div></div>","PeriodicalId":419,"journal":{"name":"Renewable Energy","volume":"244 ","pages":"Article 122697"},"PeriodicalIF":9.0,"publicationDate":"2025-02-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143444135","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A reinforcement learning-based ensemble forecasting framework for renewable energy forecasting

IF 9 1区工程技术

Renewable Energy Pub Date : 2025-02-17 DOI: 10.1016/j.renene.2025.122692

Zhiyuan Wu , Guohua Fang , Jian Ye , David Z. Zhu , Xianfeng Huang

{"title":"A reinforcement learning-based ensemble forecasting framework for renewable energy forecasting","authors":"Zhiyuan Wu , Guohua Fang , Jian Ye , David Z. Zhu , Xianfeng Huang","doi":"10.1016/j.renene.2025.122692","DOIUrl":"10.1016/j.renene.2025.122692","url":null,"abstract":"<div><div>The randomness and intermittency of wind and photovoltaic power generation can negatively affect the stability of power systems. Therefore, accurate forecasting of these energy outputs is crucial for effective power system management. Among various forecasting methods, ensemble forecasting has gained attention for its superior performance and reliability. However, traditional ensemble methods, such as weighted averaging and stacking, use fixed model combinations that fail to adapt to varying wind and radiation conditions, thereby limiting their accuracy. To overcome this limitation, this study proposes a novel ensemble forecasting framework based on reinforcement learning. The framework uses a deep Q-network to dynamically select the appropriate base model for different wind and radiation conditions. The learning process is supported by a model control module, a basic forecasting module, and a performance evaluation module. Independent experiments conducted across 14 regions in China validate the framework's effectiveness, showing a significant improvement in forecasting accuracy. The framework achieved an average improvement of 12.18 % in mean absolute scaled error over base models and 4.84 % over other ensemble methods. Additionally, this study analyzes the impact of different reinforcement learning models and sample sizes on the framework's performance.</div></div>","PeriodicalId":419,"journal":{"name":"Renewable Energy","volume":"244 ","pages":"Article 122692"},"PeriodicalIF":9.0,"publicationDate":"2025-02-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143453863","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Insight into characteristics and mechanism of CaO-enhanced municipal sewage sludge decoupled combustion for pollutant emissions control

IF 9 1区工程技术

Renewable Energy Pub Date : 2025-02-17 DOI: 10.1016/j.renene.2025.122699

Taishan Liu , Rongjiang Hao , Xinyang Zhang , Xiaohu Xu , Shuang Deng , Guangchao Ding , Songgeng Li

{"title":"Insight into characteristics and mechanism of CaO-enhanced municipal sewage sludge decoupled combustion for pollutant emissions control","authors":"Taishan Liu , Rongjiang Hao , Xinyang Zhang , Xiaohu Xu , Shuang Deng , Guangchao Ding , Songgeng Li","doi":"10.1016/j.renene.2025.122699","DOIUrl":"10.1016/j.renene.2025.122699","url":null,"abstract":"<div><div>Using organic-rich sludge as an alternative to coal has emerged as a critical area in the utilization of renewable solid waste fuels to address the growing energy crisis. To tackle the issue of high nitrogen oxides emissions during sludge combustion, this study presents the first fundamental investigations into the decoupled combustion (DC) of municipal sewage sludge (MSS), focusing on the in-situ reduction of nitrogen oxides generated by MSS pyrolysis char combustion through its pyrolysis volatiles and examining the role of CaO in the DC process. Systematic experiments are conducted to demonstrate the feasibility of the DC process, explore the effects of CaO on DC efficacy, investigate the mechanisms of DC with and without CaO, and reveal the migration and transformation pathways of nitrogen. Results indicate that the DC process functions as a “Self-Thermal De-NO<sub>x</sub>” process, primarily utilizing pyrolysis-derived NH<sub>3</sub> to reduce NO from char combustion while inhibiting N<sub>2</sub>O formation. Compared to conventional combustion (CC), DC reduces emissions by up to 49.37 % at 950 °C. When CaO is used as the bed material, it mainly mitigates the detrimental impacts of HCN and combustible gases such as CH<sub>4</sub>, H<sub>2</sub>, and CO on the selective reduction of NO by NH<sub>3</sub> through inhibiting HCN formation, reducing the total production of combustible gases and promoting NH<sub>3</sub> production, thereby enhancing the nitrogen reduction efficacy of the DC process. Compared to CC, DC with CaO (DC-CaO) reduces emissions by up to 64.01 % at 850 °C. This study provides key theoretical insights for the efficient and environmentally friendly utilization of renewable solid waste as an energy source.</div></div>","PeriodicalId":419,"journal":{"name":"Renewable Energy","volume":"244 ","pages":"Article 122699"},"PeriodicalIF":9.0,"publicationDate":"2025-02-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143453857","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

One pot conversion of fructose to alkyl levulinates catalyzed by deep eutectic solvents in microwave reactor

IF 9 1区工程技术

Renewable Energy Pub Date : 2025-02-17 DOI: 10.1016/j.renene.2025.122698

İlkin Aslanlı , Murat Sert

{"title":"One pot conversion of fructose to alkyl levulinates catalyzed by deep eutectic solvents in microwave reactor","authors":"İlkin Aslanlı , Murat Sert","doi":"10.1016/j.renene.2025.122698","DOIUrl":"10.1016/j.renene.2025.122698","url":null,"abstract":"<div><div>The conversion of biomass into valuable chemicals has emerged as a promising alternative to replace the current manufacturing of products derived from petroleum feedstocks. Methyl and ethyl levulinate are important chemicals derived from biomass, and they have the potential to be converted into other useful molecules. This work revealed the capability of acidic deep eutectic solvents (DES) to convert fructose into alkyl levulinates. DESs have attracted significant interest owing to their exceptional characteristics and broad variety of practical applications. Fructose conversion was conducted using ChCl-pTSA and ChCl-OxAc deep eutectic solvents, which possess high Brønsted acidity. The results indicated that ChCl-pTSA provided complete transformation of fructose and high yields of ethyl levulinate (59.2 %) and methyl levulinate (76.3 %) under optimal conditions within 20 min. An investigation was conducted to examine the influence of temperature and reaction duration on the one pot approach to converting fructose into alkyl levulinates. The synthesis of alkyl levulinate was increased by increasing the temperature and reaction duration, up to certain critical values.</div></div>","PeriodicalId":419,"journal":{"name":"Renewable Energy","volume":"244 ","pages":"Article 122698"},"PeriodicalIF":9.0,"publicationDate":"2025-02-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143453862","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Corn cob biomass residues: Synergies between thermochemical processes for biofuel production and adsorbent materials for the bioenergy sector

IF 9 1区工程技术

Renewable Energy Pub Date : 2025-02-17 DOI: 10.1016/j.renene.2025.122705

E. Ciurcina , S. Paniagua , L. Taboada-Ruiz , E. Fuente , L.F. Calvo , F. Suárez-García , M. Díaz-Somoano , B. Ruiz

{"title":"Corn cob biomass residues: Synergies between thermochemical processes for biofuel production and adsorbent materials for the bioenergy sector","authors":"E. Ciurcina , S. Paniagua , L. Taboada-Ruiz , E. Fuente , L.F. Calvo , F. Suárez-García , M. Díaz-Somoano , B. Ruiz","doi":"10.1016/j.renene.2025.122705","DOIUrl":"10.1016/j.renene.2025.122705","url":null,"abstract":"<div><div>This research uses corn cob (CC), a renewable material, to make biofuels. The energy conversion was done by conventional and flash pyrolysis (750–850 °C), showing how the process affects the yield and properties of the biofuels. The CC stood out for their high carbon content (48.19 %) and low ash content (1.16 %). Flash pyrolysis increased the gaseous fraction (69.8 %) and the concentration of combustible gases (higher heating value (HHV) = 16.31 MJ/kg). Research has also been carried out on the production of activated carbons from CC char to separate gas mixtures, store gas or upgrade biogas. Higher temperatures and/or amounts of activator improved their textural properties (BET surface area and total pore volume up to 1982 m<sup>2</sup>/g and 0.820 cm<sup>3</sup>/g). These adsorbents are highly effective in CO<sub>2</sub> adsorption, with a capacity of up to 15.3 mmol/g at 3 MPa for that obtained with KOH at 700 °C and 2:1 wt ratio. They are good at absorbing methane at 3 MPa with a maximum of 8.8 mmol/g when prepared with KOH at 800 °C and 2:1 wt ratio. Hydrogen adsorption was limited. The potential of CC for biofuel production through pyrolysis and the development of adsorbents applicable to the bioenergy sector have been proven.</div></div>","PeriodicalId":419,"journal":{"name":"Renewable Energy","volume":"244 ","pages":"Article 122705"},"PeriodicalIF":9.0,"publicationDate":"2025-02-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143453865","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Enhanced biodiesel purification using coffee husk bioadsorbents: The role of pyrolysis temperature, KOH activation, and adsorption efficiency

IF 9 1区工程技术

Renewable Energy Pub Date : 2025-02-17 DOI: 10.1016/j.renene.2025.122700

Thatchapol Chungcharoen , Warunee Limmun , Siriwan Srisang , Kittisak Phetpan , Nuttapong Ruttanadech , Pannipa Youryon , Pornprapa Kongtragoul , Naruebodee Srisang

{"title":"Enhanced biodiesel purification using coffee husk bioadsorbents: The role of pyrolysis temperature, KOH activation, and adsorption efficiency","authors":"Thatchapol Chungcharoen , Warunee Limmun , Siriwan Srisang , Kittisak Phetpan , Nuttapong Ruttanadech , Pannipa Youryon , Pornprapa Kongtragoul , Naruebodee Srisang","doi":"10.1016/j.renene.2025.122700","DOIUrl":"10.1016/j.renene.2025.122700","url":null,"abstract":"<div><div>This study evaluates the performance of bioadsorbents derived from coffee husk pyrolyzed at temperatures of 600, 700, and 800 °C (CH600, CH700, and CH800), along with activated CH700 (ACH700), in biodiesel purification. The results indicate that CH700 significantly enhances biodiesel purity, with optimal purification conditions achieved at a dosage of 2 wt% CH700, a stirring rate of 400 rpm, and a contact time of 45 min. CH700 demonstrated modest performance, achieving approximately 20 % removal of methanol and water. However, after activation with potassium hydroxide (KOH), ACH700 demonstrated improved efficiency, achieving 96.92 % methanol removal and 39.46 % water removal. ACH700 also refined biodiesel quality to meet EN14214 standards and maintained a higher biodiesel yield compared to other adsorbents. The bioadsorption process is influenced by the chemical interactions between the surface functional groups of the bioadsorbent and the contaminants, which is further enhanced by the optimized pore structure of ACH700. The use of ACH700 represents a novel and highly effective approach to biodiesel purification, combining both technical efficiency and economic feasibility. Furthermore, the valorization of agricultural waste adds significant environmental benefits, reinforcing the potential of ACH700 for large-scale biodiesel production.</div></div>","PeriodicalId":419,"journal":{"name":"Renewable Energy","volume":"244 ","pages":"Article 122700"},"PeriodicalIF":9.0,"publicationDate":"2025-02-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143487728","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

How high feed-in tariffs impacted the capital cost of solar PV in Japan

IF 9 1区工程技术

Renewable Energy Pub Date : 2025-02-16 DOI: 10.1016/j.renene.2025.122685

Keiji Kimura , Liv Lundberg , Tomas Kåberger

{"title":"How high feed-in tariffs impacted the capital cost of solar PV in Japan","authors":"Keiji Kimura , Liv Lundberg , Tomas Kåberger","doi":"10.1016/j.renene.2025.122685","DOIUrl":"10.1016/j.renene.2025.122685","url":null,"abstract":"<div><div>This study investigates the impact of feed-in tariffs (FITs) on the capital expenditures (CAPEX) of solar photovoltaics (PV) projects in Japan. In 2012, Japan introduced a FIT scheme with the highest tariff levels in the world. Tariffs for a project were set at the time when the project obtained a qualification, but early projects had no deadline for starting operations, and many where not built until many years later. The installed capacity of solar PV in Japan surged under the scheme. However, Japan has suffered from high costs of solar PV compared to the global level. Using survey data from Japanese solar PV projects, and econometric modelling we leverage the fact that projects qualified at different points in time, with different FIT levels, have subsequently been built simultaneously. We find that higher FIT levels are correlated with increased CAPEX, where a 1 JPY/kWh increase in the FIT level is linked to a 3.31 JPY/W rise in CAPEX. This may be due to that developers with guaranteed high tariffs have weaker incentives to reduce costs and/or to strategic pricing by suppliers. Our findings indicate that poorly designed support schemes can counteract the policy goal of reducing renewable energy costs.</div></div>","PeriodicalId":419,"journal":{"name":"Renewable Energy","volume":"244 ","pages":"Article 122685"},"PeriodicalIF":9.0,"publicationDate":"2025-02-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143463934","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0