A Gaussian quadrature method for total energy analysis in electronic state calculations

2009 ◽  
Vol 109 (12) ◽  
pp. 2664-2671 ◽  
Author(s):  
Kimichika Fukushima
Keyword(s):  
Total Energy ◽  
Electronic State ◽  
Energy Analysis ◽  
Gaussian Quadrature ◽  
Quadrature Method ◽  
Total Energy Analysis

Catalytic Indirectly Heated Gasification of Bagasse

1998 ◽  
Author(s):  
Sérgio Peres ◽  
Alex Green
Keyword(s):  
Total Energy ◽  
Energy Analysis ◽  
Heat Content ◽  
Gaseous Fuel ◽  
Gasification Process ◽  
Secondary Reactions ◽  
Gas Dilution ◽  
Gasification Reaction ◽  
Total Energy Analysis

The catalytic indirectly heated gasification of bagasse was investigated in this study. The quality of the gaseous fuel was assessed using the total energy analysis of the gas, in which both heat content and total yields of the gas produced from the gasification of bagasse are analyzed at temperatures ranging from 700 to 1000°C. Untreated bagasse gasification was used as a baseline for the investigation of the effect of catalysts on the gasification process. The total energy analysis showed a significant improvement of gas quality due to increase of temperature and due to the use of alumina-zinc based catalysts at temperatures below 900°C. The presence of these catalysts in the gasification process affected the quality of the gases formed, mainly by increasing the hydrogen production, reduction of the gas dilution by carbon dioxide and a slightly higher production of carbon monoxide. Above 900°C, temperature dominates the gasification reaction mechanisms causing the catalysts to have little or no significant effect. Thermal cracking of tar is of major importance on the gasification process, as the tar yields reduce from 42.1 to 24.7% of the bagasse original weight with the increase of the gasifier temperature from 700 to 1000°C. However, the solid residue reduced only from 16 to 13.3%. Hence, the increase in the gaseous yields at high temperature appeared to be due to the gasification of tar with some contribution from secondary reactions involving char. The result was the production of a medium heat content gaseous fuel.

scholarly journals Total energy analysis of nuclear and fossil fueled power plants

1971 ◽  
Author(s):  
W. D. Franklin ◽  
M. Mutsakis ◽  
R. G. Ort
Keyword(s):  
Total Energy ◽  
Power Plants ◽  
Energy Analysis ◽  
Total Energy Analysis

Net Energy Analysis of Molasses Based Bioethanol Production in Indonesia

2019 ◽  
Vol 2 (1) ◽  
pp. 25-30
Author(s):  
Carrin Aprinada ◽  
Irvan S. Kartawiria ◽  
Evita H. Legowo
Keyword(s):  
Total Energy ◽  
Energy Analysis ◽  
Energy Content ◽  
Energy Requirement ◽  
Net Energy ◽  
Evaporation Process ◽  
Bioethanol Production ◽  
Distillation Process ◽  
Monthly Basis ◽  
Plant Capacity

Molasses is mostly used as feedstock for the bioethanol production in Indonesia. Bioethanol industries has the potential to be more developed if the mandate of blending gasoline with 5% bioethanol is implemented. However, some previous studies abroad have shown that mostly the net energy for producing bioethanol is negative. The main purpose of this research is to analyze the net energy requirement if a bioethanol conversion plant from scenario of a bioethanol producer in East Java. Bioethanol conversion processes inside the plant are pre-fermentation, fermentation, evaporation, distillation and dehydration. Method which was used in this research are modelling and calculation made on monthly basis for plant capacity of 30,000 KL/ year ethanol of 99.5% purity. The result shows that the total energy required to produce 1 L of ethanol is 4.55 MJ. The energy content of 1 L ethanol is 23.46 MJ. The largest energy requirement is for evaporation process (62%) followed by distillation process (33%). Thus, the net energy requirement for bioethanol production process is positive.

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