International Journal of Clean Coal and Energy

Journal Information
ISSN / EISSN : 2168152X / 21681538
Current Publisher: Scientific Research Publishing, Inc. (10.4236)
Total articles ≅ 52
Archived in
SHERPA/ROMEO
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P. W. Tavares, H. D. Ndiath, M. Kâne, B. Mbow, A. T. Niang, I. Youm
International Journal of Clean Coal and Energy, Volume 9, pp 1-14; doi:10.4236/ijcce.2020.91001

Abstract:
This document presents the evaluation and the monitoring of the performances of the first grid-connected photovoltaic system installed in the Center of Studies and Researches on the Renewable Energies (CERER) inaugurated on December 4th, 2012 by the governmental authorities of Senegal and Tenerife. This mini power plant of 3.15 kWc is a perfect example of the political will of the government which is to reduce the production cost of the electricity, with the diversification of the sources of production, and the greater use of the other sources such as the natural gas, the coal, the renewable energies. The evaluation of the performances of the installation is realized by using the indicators of efficiency and performance as the photovoltaic surface yield, the ratio of photovoltaic performance, the photovoltaic specific yield, and the losses of captures. The obtained results show that a big part of the energy shone during the period of observation was not able to be used further to circumstances such as the losses of conductivity, the heat losses or for example the defects on components. The analysis also shows that a large part of the produced energy is not injected because of the dilapidation of the network, the defects of landing but especially one disjunction sees frequently at the level of the point of injection.
Xueyi Zhu, Liangfeng Zhu
International Journal of Clean Coal and Energy, Volume 9, pp 15-25; doi:10.4236/ijcce.2020.92002

Abstract:
In recent years, the Chinese government has asked enterprises to follow the path of “green development”. This requirement naturally becomes the guiding ideology of coal resource capitalization theory. this paper focuses on the core contents of the green development of coal resource capitalization, and uses the software of ROSTCM6 and UCINET to construct six frameworks of the green theory of coal resource capitalization with the method of “Condensed Subgroup”: the basic theory of capitalization, the conservation theory of capitalization, the environmental protection theory of capitalization, the harmonious coexistence theory of capitalization, the mainline development theory of ecological industry of capitalization Industrial theory, benign cycle sustainable development theory of capitalization, the paper further designs the outline content of the framework.
Weiguo Zhang, Jianye Yang, Yuan Shi, Tingting Lv, Mengmeng Fan
International Journal of Clean Coal and Energy, Volume 8, pp 1-13; doi:10.4236/ijcce.2019.81001

Abstract:
Stone coal is a special resource, because it is associated with a variety of rare metal elements. The elemental geochemical characteristics of stone coal can provide useful information for the study of its formation and evolution history. The content of rare earth elements in stone coal has been the focus of attention. Stone coal is widely distributed in southern Shaanxi province of China. In order to study the content and distribution of rare earth elements in stone coal, and provide a plan for the comprehensive development and utilization of stone coal, this study tested the rare earth elements content of stone coal, parting and coal ash samples, respectively, compared the content of rare earth elements in stone coal, parting, coal ash with the mean value of China coal, the mean value of world coal and the abundance value of upper crust, and discussed the features of rare earth elements content in different types of samples in southern Shaanxi province of China. The average contents of rare earth elements in the samples of stone coal, parting and coal ash were calculated, and the enrichment coefficients of the samples with the mean value of China coal, the mean value of world coal and the abundance value of upper crust were listed. The distribution rules and characteristics of the contents of rare earth elements in different types of samples in southern Shaanxi province of China were summarized.
Olawale O. Olanrewaju, Obafemi O. Olubanjo
International Journal of Clean Coal and Energy, Volume 8, pp 15-31; doi:10.4236/ijcce.2019.82002

Abstract:
The overdependence on crude oil in African countries warrants the need for alternative sources of energy. A 56-litre-capacity biogas digester was designed, fabricated and evaluated. Investigations were made into the production of biogas from the mixture of cow dung, swine dung and poultry dropping. Standard equations and models were used in the design of the components of the manually operated digester. The digester temperature, ambient temperature and pH were monitored during the experiment. The proximate analysis showed that volatile solid, total solid and moisture content for the mixed substrates at the initial stage were: 64.7%, 83.5% and 13.5% respectively. Similarly, at the digestion stage, the volatile solid, total solid and moisture content were: 54.1%, 22.6% and 74.4% respectively. Advancement of decomposition leads to gradual increasing pH value from 7.2 to 7.4, which indicates the stability of organic matter. The moisture content on a wet basis was initially 13.5%. This value latter increased to 74.4%. On the average, 15 kg of mixed substrates with 25 litres of impure water produced biogas within 25 days of digestion. The gas produced from mixed substrates became flammable with blue flame after 16 days of production, indicating that the ratio of methane gas generated with the three mixtures of fresh animal waste was higher than other gases produced.
Jose A. Gutiérrez, Raquel García, Erasmo Cadena
International Journal of Clean Coal and Energy, Volume 7, pp 59-92; doi:10.4236/ijcce.2018.74004

André Ndécky, Sébastien Gamache, Fabé I. Barro, Issakha Youm
International Journal of Clean Coal and Energy, Volume 7, pp 39-57; doi:10.4236/ijcce.2018.73003

Jose A. Gutiérrez, Raquel García
International Journal of Clean Coal and Energy, Volume 7, pp 21-38; doi:10.4236/ijcce.2018.72002

Essam M. Allam, Sameh M. Metwalley, Noha Muhammad
International Journal of Clean Coal and Energy, Volume 7, pp 1-19; doi:10.4236/ijcce.2018.71001

Abstract:
Nowadays, the new trend in automotive industry is the transfer to electric vehicles due to many advantages such as no noise, no pollution, saving energy and reducing carbon dioxide emissions and it is a power-driven vehicle with a motor drive wheels moving. Solar electric vehicle reduces the greenhouse gas emissions and other pollutants. This paper presents the results of measuring the range and performance of the Electric vehicles as an alternative solution for fossil fuels based on previous work. It also presents the same measured parameters for the photovoltaic cells. A comparison between the two models has been done. It demonstrates a dynamic model of an electric vehicle and photovoltaic cell using the SIMULINK in MATLAB program. It explains the method of changing the hybrid car model to electric car model. However, the second model was for the photovoltaic cell. It shows the behavior of the two models separately and combined together. The experimental work has been performed through a single seated vehicle equipped with an electric and photovoltaic cell also separately and combined together. A verification of the two models was made. The results showed that the performance of the photovoltaic model is better than the electric model. The working time of the vehicle equipped with a photovoltaic cell is enhanced by 25% of the electric vehicle.
Essam M. Allam, Sameh M. Metwalley, Noha Muhammad
International Journal of Clean Coal and Energy, Volume 7, pp 1-19; doi:10.4236/ijcce.2017.71001

Moriyasu Nonaka, Tsuyoshi Hirajima, Satoshi Kumagai
International Journal of Clean Coal and Energy, Volume 6, pp 31-39; doi:10.4236/ijcce.2017.62003

Abstract:
Peat and peatified wood are significant carbohydrate resources in tropical rainforests. The carbohydrates of cellulose and hemicellulose are important sources of monosaccharides for both vital activities and industrial applications, such as furan production of furfural and hydroxymethyl furfural. Hydrothermal treatment at 200˚C and ultrasonic irradiation pretreatment were used to recover monosaccharides from the abovementioned resources. The monosaccharide recovery from peat was shown to be higher than that from peatified wood. The conversion to organic acids is considered to proceed rapidly because acids are always detected with monosaccharides. This conversion is outstripped by the organic acid-to-gas reaction for treatment times longer than 20 min. The monosaccharide recovery from peatified wood was improved by the ultrasonication pretreatment. It is considered that ultrasonic irradiation broke down lignin blockages, enabling water molecules to access the carbohydrates more easily in the subsequent hydrothermal treatment.