scholarly journals Solar Assisted Fast Pyrolysis: A Novel Approach of Renewable Energy Production

2014 ◽  
Vol 2014 ◽  
pp. 1-9 ◽  
Author(s):  
Mohammad U. H. Joardder ◽  
P. K. Halder ◽  
A. Rahim ◽  
N. Paul
Keyword(s):  
Renewable Energy ◽  
Environmental Pollution ◽  
Fast Pyrolysis ◽  
Heating System ◽  
Electrical Heating ◽  
Successful Implementation ◽  
Pyrolysis Gas ◽  
Heating Source ◽  
Novel Approach ◽  
Reactor Heating

Biofuel produced by fast pyrolysis from biomass is a promising candidate. The heart of the system is a reactor which is directly or indirectly heated to approximately 500°C by exhaust gases from a combustor that burns pyrolysis gas and some of the by-product char. In most of the cases, external biomass heater is used as heating source of the system while internal electrical heating is recently implemented as source of reactor heating. However, this heating system causes biomass or other conventional forms of fuel consumption to produce renewable energy and contributes to environmental pollution. In order to overcome these, the feasibility of incorporating solar energy with fast pyrolysis has been investigated. The main advantages of solar reactor heating include renewable source of energy, comparatively simpler devices, and no environmental pollution. A lab scale pyrolysis setup has been examined along with 1.2 m diameter parabolic reflector concentrator that provides hot exhaust gas up to 162°C. The study shows that about 32.4% carbon dioxide (CO2) emissions and almost one-third portion of fuel cost are reduced by incorporating solar heating system. Successful implementation of this proposed solar assisted pyrolysis would open a prospective window of renewable energy.

scholarly journals Technology Pathways and Economic Analysis for Transforming High Temperature to Low Temperature District Heating Systems

Energies ◽  
2021 ◽  
Vol 14 (11) ◽  
pp. 3218
Author(s):  
Pedro Durán ◽  
Herena Torio ◽  
Patrik Schönfeldt ◽  
Peter Klement ◽  
Benedikt Hanke ◽  
...  
Keyword(s):  
Sensitivity Analysis ◽  
Renewable Energy ◽  
High Temperature ◽  
Low Temperature ◽  
Economic Analysis ◽  
District Heating ◽  
Heating System ◽  
District Heating System ◽  
Heating Systems ◽  
District Heating Systems

There are 1454 district heating systems in Germany. Most of them are fossil based and with high temperature levels, which is neither efficient nor sustainable and needs to be changed for reaching the 2050 climate goals. In this paper, we present a case study for transforming a high to low temperature district heating system which is more suitable for renewable energy supply. With the Carnot Toolbox, a dynamic model of a potential district heating system is simulated and then transformed to a low temperature supply. A sensitivity analysis is carried out to see the system performance in case space constrains restrict the transformation. Finally, an economic comparison is performed. Results show that it is technically possible to perform the transformation until a very low temperature system. The use of decentralized renewable sources, decentralized heat storage tanks and the placement of a heat pump on each building are the key points to achieve the transformation. Regarding the sensitivity analysis, the transformation is worth doing until the seasonal storage and solar collector field sizes are reduced to 60% and 80% of their values in the reference case, respectively. The economic analysis shows, however, that it is hard for highly efficient low temperature renewable based heat networks to compete with district heating systems based on a centralized fossile CHP solution. Thus, though the presented transformation is technically possible, there is a strong need to change existing economic schemes and policies for fostering a stronger promotion of renewable energy policies in the heat sector.

scholarly journals Assessment of Cow Dung Pellets as a Renewable Solid Fuel in Direct Combustion Technologies

Energies ◽  
2021 ◽  
Vol 14 (4) ◽  
pp. 1192
Author(s):  
Aneta Szymajda ◽  
Grażyna Łaska ◽  
Magdalena Joka
Keyword(s):  
Renewable Energy ◽  
Calorific Value ◽  
Cow Dung ◽  
Fixed Carbon ◽  
Direct Combustion ◽  
Potential Source ◽  
Novel Approach ◽  
Combustion Tests ◽  
Promising Source ◽  
Compaction Properties

Recently, biomass application as a renewable energy source is increasing worldwide. However, its availability differs in dependence on the location and climate, therefore, agricultural residues as cow dung (CD) are being considered to supply heat and/or power installation. This paper aims at a wide evaluation of CD fuel properties and its prospect to apply in the form of pellets to direct combustion installations. Therefore, the proximate, ultimate composition and calorific value were analyzed, then pelletization and combustion tests were performed, and the ash characteristics were tested. It was found that CD is a promising source of bioenergy in terms of LHV (16.34 MJ·kg−1), carbon (44.24%), and fixed carbon (18.33%) content. During pelletization, CD showed high compaction properties and at a moisture content of 18%,and the received pellets’ bulk density reached ca. 470 kg·m−3 with kinetic durability of 98.7%. While combustion, in a fixed grate 25 kW boiler, high emissions of CO, SO2, NO, and HCl were observed. The future energy sector might be based on biomass and this work shows a novel approach of CD pellets as a potential source of renewable energy available wherever cattle production is located.

scholarly journals Renewable Energy Perception by Rural Residents of a Peripheral EU Region

2019 ◽  
Vol 11 (7) ◽  
pp. 2075 ◽  
Author(s):  
Ozgur Kaya ◽  
Wojciech Florkowski ◽  
Anna Us ◽  
Anna Klepacka
Keyword(s):  
Renewable Energy ◽  
Environmental Pollution ◽  
Energy Saving ◽  
Coal Combustion ◽  
Empirical Relationship ◽  
Rural Residents ◽  
Explanatory Variables ◽  
Graphic Depiction ◽  
Saving Behavior ◽  
Local Opposition

Renewable energy (RE) sources are often locally available and have the potential to lessen the rural dependence on the national power grid, reducing disruptions in power supplies and the heavy dependence on coal combustion. Poland faces an EU mandate of a 15% share of renewables in energy generation by 2020. However, the installations intended to supply several types of RE encountered local opposition, forcing a cancellation of the planned investments and stressing a need for understanding rural residents’ attitudes towards RE in general. Using survey data, this paper examines the perception of RE importance among rural residents in eastern Poland. The specified empirical relationship includes the sociodemographic and economic characteristics of residents. Perceptions of the links between health and specific sources of environmental pollution and actions demonstrating energy-saving behavior serve as explanatory variables. The performance of the estimated logit equation was rigorously tested. The probability of attaching importance to RE by rural residents increases most if a respondent displayed an energy-saving behavior, has certain demographic characteristics, and links health to environmental pollution caused by coal combustion. The graphic depiction of the effects of selected variables succinctly communicates possible future programs aimed at strengthening the rural population support of RE.

Fast Pyrolysis of Biomass in Pyrolysis Gas: Fractionation of Pyrolysis Vapors Using a Spray of Bio-oil

2012 ◽  
Vol 26 (5) ◽  
pp. 2962-2967 ◽  
Author(s):  
Chih-Chiang Chang ◽  
Seng-Rung Wu ◽  
Chi-Cheng Lin ◽  
Hou-Peng Wan ◽  
Hom-Ti Lee
Keyword(s):  
Fast Pyrolysis ◽  
Pyrolysis Gas ◽  
Bio Oil ◽  
Pyrolysis Of Biomass

Coupling of Power and Heating Sector – Opportunity for Heating Sector Development

2021 ◽  
Author(s):  
◽  
Armands Grāvelsiņš
Keyword(s):  
European Union ◽  
Renewable Energy ◽  
System Dynamics ◽  
System Development ◽  
Heating System ◽  
System Dynamics Model ◽  
Dynamics Model ◽  
Power Sector ◽  
National Scale ◽  
Energy Share

European Union has set ambitious decarbonization goals under Green Deal, therefore, Latvia needs to search for solutions on how to move towards reaching the said goals. Although renewable energy share in Latvia is one of the highest among the European Union countries, it is mostly due to historic heritage, not as the result of implementing meaningful policies. Essential high renewable energy share in power sector comes from three large hydroelectric stations on Daugava, which is heritage from the Soviet Union times. Steady increase in renewable energy share can be observed in District Heating, however it is based on increased utilization of biomass, and that most likely is not a sustainable solution. Considering that bioeconomy will experience significant growth in the future, utilization of wood resource for production of products with low added value will steadily phase out. For energy sector it means the necessity to look for other alternatives to replace fossil fuels. If in other European countries (Denmark, Germany, the Netherlands, Lithuania, Estonia, et al.) solar and wind technology capacity have significantly increased over last decade, in Latvia this increase is negligible. Only in the last few years significant increase in installed solar capacities can be observed, but total capacity is still low. Latvia needs to seek solutions on how to increase the introduction rate of renewable energy technologies in order to move towards carbon neutrality in 2050. The aim of the Thesis is to develop a comprehensive system dynamics model which can be used to analyze energy sector at both national and local scale. It should include both heating and power sectors and be able to evaluate the possibility of sector coupling and its influence on the total system. Specific objectives are set to reach the aim: to develop a system dynamics model structure for heating system development; to analyze the heating system at local and national scale; to assess the importance of power sector flexibility on system development; to implement the elements of sector coupling in energy system; to analyze sector coupling as a flexibility increase measure for national scale and local systems.

Renewable energy policy scenarios as implementation moderation of fuel subsidy policy in Indonesia

foresight ◽  
2018 ◽  
Vol 20 (5) ◽  
pp. 527-553
Author(s):  
Ferdy Novianto ◽  
Sumartono Sumartono ◽  
Irwan Noor ◽  
Lely Indah Mindarti
Keyword(s):  
Renewable Energy ◽  
Energy Policy ◽  
Successful Implementation ◽  
Renewable Energy Policy ◽  
Subsidy Policy ◽  
Content Type ◽  
Bureaucratic Structure ◽  
The Relationship ◽  
Energy Subsidy ◽  
Policy Scenarios

Purpose This paper aims to examine the effect of communication, resources, disposition and bureaucratic structure to the success of energy subsidy policy, to examine the effect of moderation of variable scenario of renewable energy policy on the influence of communication, resources, disposition and bureaucracy structure on the success of energy subsidy policy. Design/methodology/approach This study was purposively (based on specific objectives) conducted in Jakarta, which is associated with the implementation and subsidy policy scenario, the study focused on the center of government, namely, the capital city, Jakarta. Collection of data in this research survey was conducted in June-August 2017. The sampling technique was proportional stratified random sampling that took up most of the 770 members of Masyarakat Peduli Energi dan Lingkungan and Masyarakat Energi Terbarukan Indonesia using a representative sample of results that have the ability to be generalized. Based on the formula Slovin (Solimun and Fernandes, 2017), a sample of 145 respondents was obtained. The research approach used was a quantitative with the analysis tool called the generalized structure component analysis. Findings This paper exhibited that all relationships between variables have a p-value of 0.05 except the third moderation and fourth moderation relationship. So it can be said that all relationships between variables are significant except the relationship between the variables of moderation to the relationship between the disposition variable (X3) on the successful implementation of subsidy policy (Y) and the relationship between the moderation variable to the relationship between bureaucracy structure variable (X4) to the successful implementation of subsidy policy. Originality/value The originality of the research refers to the following: The Policy Theory described by Edwards III (1980), and reinforced by the findings of Ratminto and Winarsih (2005), and Bloom et al. (2009), that communication, resources, dispositions and bureaucratic structures affect the success of the energy subsidy policy. This becomes the formulation of a hypothesized research problem whether communication, resources, disposition and bureaucratic structure affect the success of the energy subsidy policy. In fact, the conditions in Indonesia are quite different from the Western world, and the system in Indonesia has embraced subsidies. Therefore, this study also examines the moderating effects of renewable energy policy scenarios in the relationship between communication, resources, dispositions and bureaucratic structures on the success of the subsidy policy energy. Given that there is no strong theory that examines the effects of moderation of these four factors on the success of the energy subsidy policy. Therefore, as the development of Edward III Theory, this study examines the proposition of whether renewable energy policy scenarios reinforce or weaken (moderation effects) on the effects of communication, resources, dispositions and bureaucratic structures on the success of energy subsidy policies.

scholarly journals Maximizing Anhydrosugar Production from Fast Pyrolysis of Eucalyptus Using Sulfuric Acid as an Ash Catalyst Inhibitor

Catalysts ◽  
2018 ◽  
Vol 8 (12) ◽  
pp. 609 ◽  
Author(s):  
Dongyan Zhang ◽  
Yuyang Fan ◽  
Anqing Zheng ◽  
Zengli Zhao ◽  
Fengyun Wang ◽  
...  
Keyword(s):  
Rank Order ◽  
Maximum Yield ◽  
Fast Pyrolysis ◽  
Value Added ◽  
Gas Chromatography Mass Spectrometry ◽  
Cellulose Content ◽  
Pyrolysis Gas ◽  
X Ray ◽  
Theoretical Yield ◽  
Pure Cellulose

Anhydrosugars, such as levoglucosan (LG), are high value-added chemicals which are mainly derived from fast pyrolysis of pure cellulose. However, fast pyrolysis of raw lignocellulosic biomass usually produces a very low amount of levoglucosan, since alkali and alkaline earth metals (AAEM) present in the ash can serve as the catalysts to inhibit the formation of levoglucosan through accelerating the pyranose ring-opening reactions. In this study, eucalyptus was impregnated with H2SO4 solutions with varying concentrations (0.25–1.25%). The characteristics of ash derived from raw and H2SO4-impregnated eucalyptus were characterized by X-ray fluorescence spectroscopy (XRF) and X-ray diffraction (XRD). The pyrolysis behaviors of raw and H2SO4-impregnated eucalyptus were performed on the thermogravimetric analysis (TGA) and pyrolysis-gas chromatography/mass spectrometry (Py-GC/MS). TG analysis demonstrated that the H2SO4-impregnated eucalyptus produced less char than raw eucalyptus. Py-GC/MS analysis showed that even small amounts of H2SO4 can obviously improve the production of anhydrosugars and phenols and suppressed the formation of carboxylic acids, aldehydes, and ketones from fast pyrolysis of eucalyptus. The rank order of levoglucosan yield from raw and impregnated eucalyptus was raw < 1.25% H2SO4 < 1% H2SO4 < 0.75% H2SO4 < 0.25% H2SO4 < 0.5% H2SO4. The maximum yield of levoglucosan (21.3%) was obtained by fast pyrolysis of eucalyptus impregnated with 0.5% H2SO4, which was close to its theoretical yield based on the cellulose content. The results could be ascribed to that H2SO4 can react with AAEM (e.g., Na, K, Ca, and Mg) and lignin to form lignosulfonate, thus acting as an inhibitor to suppress the catalytic effects of AAEM during fast pyrolysis of eucalyptus.

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