scholarly journals Torrefied Biomass as an Alternative in Coal-Fueled Power Plants: A Case Study on Grindability of Agroforestry Waste Forms

2020 ◽  
Vol 2 (3) ◽  
pp. 270-289 ◽  
Author(s):  
Leonel J. R. Nunes
Keyword(s):  
Power Plants ◽  
Large Scale ◽  
Electric Energy ◽  
Electrical Energy ◽  
Empirical Methods ◽  
Biomass Waste ◽  
Waste Forms ◽  
Good Potential ◽  
Definition Of ◽  
Hardgrove Grindability Index

The use of biomass as a renewable energy source is currently a reality, mainly due to the role it can play in replacing fossil energy sources. Within this possibility, coal substitution in the production of electric energy presents itself as a strong alternative with high potential, mostly due to the possibility of contributing to the decarbonization of energy production while, at the same time, contributing to the circularization of energy generation processes. This can be achieved through the use of biomass waste forms, which have undergone a process of improving their properties, such as torrefaction. However, for this to be viable, it is necessary that the biomass has a set of characteristics similar to those of coal, such that its use may occur in previously installed systems. In particular, with respect to grindability, which is associated with one of the core equipment technologies of coal-fired power plants—the coal mill. The objective of the present study is to determine the potential of certain residues with agroforestry origins as a replacement for coal in power generation by using empirical methods. Selected materials—namely, almond shells, kiwifruit pruning, vine pruning, olive pomace, pine woodchips, and eucalyptus woodchips—are characterized in this regard. The materials were characterized in the laboratory and submitted to a torrefaction process at 300 °C. Then, the Statistical Grindability Index and the Hardgrove Grindability Index were determined, using empirical methods derived from coal analysis. The results obtained indicate the good potential of the studied biomasses for use in large-scale torrefaction processes and as replacements for coal in the generation of electrical energy. However, further tests are still needed, particularly relating to the definition of the ideal parameters of the torrefaction process, in order to optimize the grindability of the materials.

The Utilization Potential of Rice Husk as an Alternative Energy Source for Power Plants in Indonesia

2013 ◽  
Vol 845 ◽  
pp. 494-498 ◽  
Author(s):  
Muhammad Anshar ◽  
Ab Saman Abd Kader ◽  
Farid Nasir Ani
Keyword(s):  
Rice Husk ◽  
Alternative Energy ◽  
Power Plants ◽  
Electric Energy ◽  
Electrical Energy ◽  
Alternative Fuel ◽  
Rice Production ◽  
Steam Power Plants ◽  
Coal Fuel ◽  
Energy Needs

The utilization of rice husk as an alternative fuel for the power plant in Indonesia is still under study. In present, steam power plants in Indonesia are still using coal fuel. This study was conducted to obtain data on the development potential of rice husk within 12 years duration. The potential of rice husk for each province was obtained by analyzing the rice production of 22 provinces that have rice production greater than 1 million tons per year. The study shows that the potential of rice husk and potential electrical energy increased by about 36.8% within 12 years or an average increase of around 3.1% per year. For the potential of rice husk in 22 provinces, the total gain was estimated 12.76 × 106 tons which is equivalent to 6.62 × 106 tons of coal or equivalent to 3.68 × 106 tons of oil. The available capacity of power plants is around 5,664 MW with the potential of electric energy is around 49,622 GWh. This potential is equivalent to 50% of the energy needs of coal in Indonesia in 2011, which was about 99,312 GWh. In conclusion, rice husk is indeed potential to be used as an alternative fuel in power plants thanks to its increasing yearly production and ability for distribution to all provinces in Indonesia.

scholarly journals Valorization of potentials of wind energy in Montenegro

2017 ◽  
Vol 21 (5) ◽  
pp. 1893-1903 ◽  
Author(s):  
Radoje Vujadinovic ◽  
Esad Tombarevic ◽  
Uros Karadzic
Keyword(s):  
Wind Energy ◽  
Power Plants ◽  
Electric Energy ◽  
Electrical Energy ◽  
Annual Production ◽  
Wind Fields ◽  
Energy Potential ◽  
Hydro Power ◽  
Technical Data ◽  
Mean Values

Investments in energy sector are usually long term processes both in construction and exploitation phase, and therefore require many conditions to be satisfied, mostly from legislative and technical sector. While the legislative can change in accordance with economy activities in the country, technical data (on-site measurements) which are the main base for energy facility design, need to be reliable as much as possible. Wind energy has a significant global potential which exceeds the world?s electrical energy consumptions. This paper presents the estimation of wind energy potentials in Montenegro, based on all previous available studies in this field. The wind energy potential in Montenegro is based on a combination of 3-D numerical simulations of wind fields on the entire territory, and comprehensive on-site measurements. The preliminary studies show that there is a potential of areas with high and mean values of a capacity factor about 400 MW, and annual production of 900 GWh of electric energy. The share of wind parks in the total installed power in Montenegro is planned to be about 8%, while an adequate ratio of wind parks in an annual production from renewable sources (large hydro power plants are included here) is estimated to be 11.4%. The paper presents the current state of art in the field of building of wind parks in Montenegro. A particular attention was paid to the legislation framework and strategic documents in the energy area in Montenegro.

scholarly journals Stamec-Gravitism: A Simple Theoretical Study to Inspire a Prototype Fabrication for Mobile Perpetual Electricity Generator

2020 ◽  
Vol 3 (2) ◽  
pp. 257-274
Author(s):  
Yosua Pratama Iswahyudi ◽  
Hendry Izaac Elim
Keyword(s):  
Large Scale ◽  
Theoretical Study ◽  
Electrical Power ◽  
Classical Mechanics ◽  
Electrical Energy ◽  
Theoretical Work ◽  
Theoretical Research ◽  
Physical Parameters ◽  
Basic Physics ◽  
Definition Of

This novel research presents a theoretical work and its simple simulation as a breakthrough way to derive a mobile electricity apparatus with the weight of ~5 kg generated by an eternal gravity force on earth. The theoretical research was extracted in such a guide simply by incorporating statistical mechanics, classical mechanics and basic theory of electricity and magnetism. In the above-mentioned smart calculation, ones obtain the definition of a constant temperature particularly in isothermal enviromental nature. Furthermore, by solving the whole basic physics relationship with gravity source of power, the electrical energy formula was excerpted with the simplification through a Stamec-Gravitism: a simple theoretical study to inspire a prototype fabrication for mobile perpetual electricity generator. Furthermore, the work is sustained with its simulation results to find out the working physical parameters for normal use of alternating current (AC) electricity system with frequency of 50 Hz and electrical power of ~100 Watt for each proposed apparatus. This research suggests a bright future for the light mobile electricity generator for the needy and the poor in every different nations and tribes consisted of thousands of small islands because it does not need battery storage to work in any different conditions and weather so that such novel work can contribute in a large scale to mitigate natural disasters on earth by implementing it in all human being daily activities based energy uses.

scholarly journals Turbine Cascades of Last Stage Blades for Wide Range of Operating Conditions

2019 ◽  
Vol 4 (4) ◽  
pp. 33 ◽  
Author(s):  
Ondrej Novak ◽  
Marek Bobcik ◽  
Martin Luxa ◽  
Jaroslav Fort ◽  
Bartolomej Rudas ◽  
...  
Keyword(s):  
Steam Turbine ◽  
High Speed ◽  
Power Plants ◽  
Electric Energy ◽  
Combined Cycle ◽  
Operating Conditions ◽  
Biomass Waste ◽  
Wide Range ◽  
Last Stage ◽  
Turbine Cascades

Recent trends in the electric energy market such as biomass, waste incineration or combined cycle power plants require innovative solutions in steam turbine design. Variable operating conditions cause significant changes in flow field surrounding the steam turbine last stage blades. Therefore, the enlargement of operating range for last stage blades presents new challenges in design of turbine cascades. Several turbine cascades were designed and analyzed by commercial and in-house software of CTU Prague. Selected profiles were experimentally validated in the high-speed wind tunnel for 2D cascade measurements of the Institute of Thermomechanics of the Czech Academy of Sciences which is equipped by an adjustable supersonic inlet nozzle, perforated inserts at side walls and adjustable perforated tailboard. Comparisons are presented of numerical results with optical and pneumatic measurements for a wide range of inlet and outlet Mach numbers for optimized hub and tip profile cascades.

scholarly journals Microbial Fuel Cell and its Efficiency in Treating Wastewater - a Novel Technique for Wastewater Treatment

2018 ◽  
Vol 7 (3.12) ◽  
pp. 69
Author(s):  
B Antony Fantin ◽  
S Ramesh ◽  
J S.Sudarsan ◽  
P Vanamoorthy Kumaran
Keyword(s):  
Wastewater Treatment ◽  
Fuel Cells ◽  
Fuel Cell ◽  
Microbial Fuel Cell ◽  
Microbial Fuel Cells ◽  
Large Scale ◽  
Electric Energy ◽  
Electrical Energy ◽  
Organic Content ◽  
Good Energy

Due to depletion of coal and other natural fuel there is an urgent need to find eco-friendly and workable technology for alternate energy. Microbial fuel cells is considered as assuringmethod to extract energy from various sources of wastewater and to generate electricity. But, due to practical limits, MFCs are still unsuitable to meet high power demands. Since wastewater contains several contaminants including organic substances, therefore, generation of electric energy from wastewater using MFC can offer an alternate solution for electricity issue as well as to reduce environmental pollution. Microbial fuel cells harvest electrical energy from wastewater with the help of microorganisms present within the wastewater. The energy confined in organic matter converted in to useful electric current. In Microbial Fuel Cell electrons from the microorganisms transfer from a reduced electron donor to an electron acceptor at a higher electrochemical potential. The study highlights that wastewater with high organic content found to be more effective and it also gives good energy production. If the same concept implemented in large scale it can help in achieving sustainable development and it helps in achieving 3R formula in the process of wastewater treatment. 

An Improved Methodology to Design Large-Scale Photovoltaic Power Plant

2017 ◽  
Vol 140 (1) ◽  
Author(s):  
Ali Durusu ◽  
Ali Erduman
Keyword(s):  
Power Plant ◽  
Case Studies ◽  
Social Life ◽  
Energy Demand ◽  
Power Plants ◽  
Large Scale ◽  
Electrical Energy ◽  
Optimal Number ◽  
Electricity Production ◽  
Pv Modules

A secure and reliable supply of energy is important for economic stability and even in social life. Increasing human population, industrialization, and rising living standards lead to increased electrical energy demand. Uncertainties in oil prices, shortage of fossil fuel reserves, and environmental pollution from conventional fuels leads solar energy as an alternative resource for electricity production. The share of installed photovoltaic (PV) capacity as a percent of total installed power generating capacity is increasing every year. In this study, an improved methodology to design large-scale PV power plant is proposed. The proposed methodology is performed for designing optimal configurations of PV power plants. The design methodology is performed using commercially available PV modules and inverters. In addition, solar radiation, ambient temperature, wind speed, shadow effect, and location and shape of plant field are taken into consideration as input parameters. The alternatives and parameters are evaluated with the purpose of minimizing the levelized cost of generated electricity (LCOE). The methodology includes the use of a genetic algorithm (GA) for determining the optimal number of PV modules and inverters, optimum tilt angle of PV modules, required installation area for the plant and optimum cable cross section and lengths. In the paper, the methodology is implemented, and case studies and results using pvsyst software for the same case studies are compared with each other.

scholarly journals Counter-rotating electric generator for wind power plants with liquid metal energy transfer

2021 ◽  
Vol 2094 (5) ◽  
pp. 052018
Author(s):  
A V Egorov ◽  
Yu F Kaizer ◽  
A V Lysyannikov ◽  
A V Kuznetsov ◽  
V G Shram ◽  
...  
Keyword(s):  
Liquid Metal ◽  
Power Plants ◽  
Electric Energy ◽  
Electrical Energy ◽  
Temperature Limit ◽  
Specific Power ◽  
Metal Contact ◽  
Electric Generator ◽  
Wind Power Plants ◽  
Friction Mode

Abstract The problem of creating effective structures that ensure mutual rotation of the rotor and stator of an electric generator. The wide practical application of counter-rotor wind-electric generators, which provide a significant increase in specific power, is hindered by the disadvantages and low reliability of existing systems for removing electric energy from the windings of a rotating counter-rotor, due to the dry friction mode. It is possible to increase the reliability of the contact removal of electrical energy from the counter rotor (rotating stator) by replacing solid brushes with liquid metal contact groups, which will lead to a certain increase in the resistivity of the contact group, compensated by the contact area of the liquid metal with the contact ring. It is most advisable to use liquid metal contact groups based on gallium, which will raise the permissible temperature limit of operation by about 2 times compared to the achieved level to 275 °C and, thereby, additionally raise the specific power of the electric generator.

Energy Storage, Distribution, Use and Climate Impact

2018 ◽  
Author(s):  
E. L. Wolf
Keyword(s):  
Energy Storage ◽  
Transmission Lines ◽  
Carbon Capture ◽  
Power Plants ◽  
Large Scale ◽  
Electrical Energy ◽  
Climate Impact ◽  
Battery Technology ◽  
Continuous Power ◽  
Energy Grid

The large-scale energy grid often comprises both AC and DC transmission lines. DC transmission at ultrahigh voltages is more efficient, but consumers need AC at lower voltage so that AC/DC conversion stations are key elements. In modern conversion stations large silicon thyristors are key devices. Energy storage in pumped-hydro installations can be supplemented by compressed air storage. Thermal plants can store energy in molten salts to provide continuous power for consumers. Battery technology is expensive at grid scale but is expanding. The possibility of carbon capture at power plants is discussed. Energy in this chapter is assumed to be electrical energy, with a large portion devoted to the electric grid.

scholarly journals A Legal Framework for Sustainable Electrical Energy Industry in Nigeria

2018 ◽  
Vol 8 (2) ◽  
pp. 45
Author(s):  
Mercy O. Erhun ◽  
Daniel O. Johnson
Keyword(s):  
Economic Growth ◽  
Sustainable Development ◽  
Power Plants ◽  
Electric Energy ◽  
Electrical Energy ◽  
Legal Framework ◽  
Energy Resources ◽  
Short Supply ◽  
Hydropower Potential ◽  
Domestic Power

Nigeria has fairly adequate endowment of energy resources, yet the country is lagging behind in terms of access to reliable and affordable energy supply. The country faces serious challenges as a result of declining electricity generation from domestic power plants. This steady decline has led to a near failure of the electric power sector. Electricity supply required to place Nigeria on the path of economic growth and sustainable development is in very short supply. The country has just 45 electrification rate, with only 54.7% of her population electrified as at 2016. More than 80 million people are still without access to electricity with frequent power failure. This has contributed to the slow economic growth currently experienced in Nigeria. Regular power supply is the hallmark of a developed economy. Nigeria is blessed with energy resources which could be harnessed to provide various modern energy services and which could have played essential role in the effort to alleviate poverty in the country. There is failure to mobilize the required resources for the development of energy resources in Nigeria. Around 1,500MW of Nigeria’s hydropower potential is currently being used, contributing to about 30% of the total amount of electricity produced. The large amount of gas associated with oil exploration operations is being wasted through flaring instead of being valuably used for power generation and industrial processes. Current patterns of production and consumption of energy are not sustainable. This paper highlights the importance of sustainable electric energy development in attaining sustainable development in Nigeria.

scholarly journals MODELING OF GREEN ENERGY SOURCES –A SOLAR AND WIND HYBRID MODEL

2013 ◽  
pp. 50-52
Author(s):  
DIKSHA KHARE ◽  
SF. LANJEWAR
Keyword(s):  
Wind Power ◽  
Electric Energy ◽  
Electrical Energy ◽  
Tidal Energy ◽  
Green Energy ◽  
Energy Sources ◽  
New Energy ◽  
Verification Process ◽  
Definition Of ◽  
And Control

In parallel to developing technology, demand for more energy makes us seek new energy sources. The most important application field of this search is renewable energy resources.Wind and solar energy have been popular ones owing to abundant, ease of availability and convertibility to the electric energy. We will focus on Modeling the design and verification process for Renewable and Green Energy sources.Samples like solar,wind and tidal energy are used for making model.The term Green energy can be associated with environment-friendly Generation,transport,storage and control of electrical energy .Solar power,wind power and the natural flow of water are resources that comply with our definition of Green Energy.Since the natural fossil energy resources are limited on this planet,we have to put our focus on green power generation like solar and wind power.

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