Energy consumption management is essential because the natural resources should be preserved for the future people, and environment, the economy and the energy security of the country are also considered. Air pollution in Tehran has increased very much and thousands of More
Energy consumption management is essential because the natural resources should be preserved for the future people, and environment, the economy and the energy security of the country are also considered. Air pollution in Tehran has increased very much and thousands of people die every year because of it. In addition, the supply of diesel fuel under the current political circumstances of the country and the allocation of high value of subsidies to it have become a big problem for the government; the use of Compressed Natural Gas (CNG) buses for public transportation can be a solution to this problem. However, the CNG buses are not widely used in recent years. Based on historical approaches and using system dynamics (SD), the factors and feedback affecting the sustainable increase in the number CNG buses are identified in this paper and a dynamic model is introduced for the optimal and sustainable development of CNG buses. The model was validated and a 10-year period was simulated; according to the results, if the government does not increase the rate of its purchased CNG buses, the rate of the CBG buses being used now will be reduced from 38 percent to 14 percent in 2032. If 282 new CNG buses are purchased annually, the number of CNG buses and the number of diesel buses will be almost the same in 2032. Accordingly, fuel pollution produced by the buses and the fuel subsidies will be reduced.
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Gas distribution networks are considered essential. Therefore, considering the importance of the implementation of such projects and the challenges raised in this field, the present study tries to evaluate the key criteria of risk management in the implementation of net More
Gas distribution networks are considered essential. Therefore, considering the importance of the implementation of such projects and the challenges raised in this field, the present study tries to evaluate the key criteria of risk management in the implementation of network projects by comparing two fuzzy multi-indicator decision-making techniques. Pay for the distribution of natural gas. For this purpose, by selecting a number of 36 experts and experts in the field of natural gas industry, using a researcher-made questionnaire, Lawshe method and multi-indicator decision- making techniques based on fuzzy SWARA and fuzzy best- the worst method were used. The obtained results indicate that, out of 32 risk management criteria, 17 criteria were identified as key risk management criteria. Also, based on the results, it is concluded is consistent that the final and definitive weight of the criterion of inadequacy or lack of technical information for design in carrying out the fuzzy best- the worst method multi-indicator decision-making technique with the second rank of the final and definitive weight obtained in the fuzzy SWARA multi-indicator decision-making technique and has been evaluated with the highest importance and the final and definitive weight of the criterion of the inappropriate evaluation process and the selection of suppliers and contractors in two multi-indicator decision- making techniques has been evaluated with the least importance. They share meaning with each other.
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Improving safety and increasing efficiency of utilization of natural gas is very important issue due to its wide use as one of the main energy sources for industry and home consumers all around the world. On the other hand, utilization of this clean fossil energy is too More
Improving safety and increasing efficiency of utilization of natural gas is very important issue due to its wide use as one of the main energy sources for industry and home consumers all around the world. On the other hand, utilization of this clean fossil energy is too risky without considering safety cautions regarding gas leakage, explosion, and flammability. Due to the above mentioned facts and to overcome the problems, it is vital to inject proper compounds to natural gas to make it easily detectable by any person. So far, various types of compounds as "odorant" have been formulated and produced to inject to natural gas. In case of gas leakage, these compounds at low concentration are easily detectable by any person, due to their specific and pungent stink odor. Odorants are classified into classical and modern categories. In this article, a comprehensive study on different aspects of modern natural gas odorants and their odorization process has been performed. In addition, with studying basic chemistry and history of these compounds, the most important properties of odorants have been presented in order to help to recognize the most proper odorant for a specific application and its synthesis methods.
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