共查询到20条相似文献,搜索用时 109 毫秒
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随着我国汽车保有量及燃料消耗量的快速增加,发展低碳汽车燃料对提高国家能源安全、减缓交通温室气体排放、促进低碳技术创新、提高我国汽车和燃料产业的竞争力具有重要现实意义。本文提出了促进汽车燃料多元化,多技术互补协调发展,建立"国家汽车燃料生命周期研究中心",设定合理低碳汽车燃料利用目标及燃料平均碳强度目标等六条政策建议来推动汽车燃料低碳化进程。 相似文献
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为减少空气污染和更广泛使用清洁燃料,欧盟法律界就使用低硫和无硫汽油和柴油的法律文书进行了长时间的辩论,1月30日欧盟议会通过了该法规,规定欧盟到2005年使用低硫汽油和柴油,至2009年1月欧盟的全部道路运输统一使用无硫汽油和柴油燃料。硫含量限制在10ppm的举措将推动企业开发新的燃料发动机,改进汽车尾气催化转化器的效率。使用无硫燃料的规定将帮助欧盟达到既定的目标,新车CO2的排放平均每公斤燃料减少120克。新法规规定至2006年非道路运输机械,如农场和林场使用的拖拉机,建筑设备如大型挖土机、推土机… 相似文献
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为缓解能源危机和环境污染,生物燃料成为石化燃料的理想替代品.由于不占用农用地,麻疯树成为了倍受欢迎的生物柴油原料.通过对云南省开发麻疯树生物柴油的SWOT分析得出,该省具有开发麻疯树生物柴油天然的优势,但从外部环境来看,机遇与威胁并存.为了促进云南生物柴油产业的健康发展,应在现有优势的基础上充分利用外部机遇并减少外部威胁. 相似文献
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This study aimed at clarifying the impact of deforestation and afforestation on the quality of life in a village in Sichuan Province, China. We devised a conceptual model of bioresource production and use based on quantified energy flow. The basic structure of the model has three sectors: production, use, and externals. We developed comprehensive methodology to quantify the model. Bioresource use per person in 1997 was 3.7 GJ for food, 10.2 GJ for fodder, 0.2–0.4 GJ for building material, 12.8 GJ for fuel, and 1.8 GJ for fertilizer, totaling 28.6–28.8 GJ.We used four environmental indicators to evaluate bioresource production and use: a biological productivity indicator, a use-efficiency indicator, a supply–demand balance indicator, and a self-sufficiency indicator. Use of these indicators showed that supply-demand balance of fuel was dramatically improved from 30% to 85% by afforestation, but 99% of bioresource use still depends on domestic products. Thus, it is necessary to improve biological productivity and promote the efficient use of bioresources to achieve sustainable living in the area. Massive deforestation in the 1950s caused a direct shortage of building material and fuel wood. The shortage of wood led to a stagnation in the rebuilding of houses, and fuel wood was substituted with crop residues. Because crop residues had been used for fertilizer and fodder, their use as fuel caused a shortage of fertilizer and fodder. This was an indirect impact of deforestation on peoples quality of life. 相似文献
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Fire behaviour under experimental conditions is described in nine Mediterranean gorse shrublands ranging from 3-12 years of age with different fuel loads. Significant differences in the fire-line intensity, fuel load and rate of fire spread have been found to be related to the stage of development of the communities. Fire spread is correlated with fuel moisture using multiple regression techniques. Differences in fuel moisture between mature and young communities under moderate weather conditions have been found. The lower moisture content identified in the mature shrubland is due both to the decreasing moisture content of senescent shrubland in some species, mainly in live fractions of Ulex parviflorus Pour. fuel, and to a substantial increase in dead fuel fractions with low percentages of moisture content. The result is that the older the shrubland is, the greater will be the decrease in the total moisture content of the vegetation. In these moderate weather conditions, the fire intensity of the mature community was as high as the maximum intensity recommended for prescribed fires. This fact seems to indicate that, even under moderate conditions, prescribed burning as an alternative management tool in the mature shrubland must always take into account fuel control; on the other hand, this technique could be applied more easily when the shrubland is at an intermediate growth stage (4-5 years of age). Therefore, more frequent low-intensity prescribed fires are indicated to abate the risk of catastrophic fire. 相似文献
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现代环境生物技术的发展与应用 总被引:1,自引:0,他引:1
现代环境生物技术作为由环境工程与现代的生物学技术相结合而发展起来的新兴学科,现已广泛应用于理论研究和生产实践中。本文在了解环境生物技术发展过程和特点的基础上,讨论了环境生物技术的应用及未来的发展趋势。 相似文献
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Chengyuan Gong Yi Yu Kaiqiang Wang Zhengkai Tu 《International Journal of Green Energy》2020,17(10):591-601
ABSTRACT In this study, a three-dimension (3D) computational model was proposed to investigate the flow and heat transfer characteristics of the intake grilles of two different fuel cell vehicles. The models of the intake grilles were constructed according to the actual sizes of two vehicles, namely, Roewe 950 and Toyota Mirai, considering the heat dissipation unit to simplify the heat transfer model of the vehicle. The results showed that relative to Roewe 950, Mirai intake air flow rate was approximately 10% higher, the heat transfer capacity was approximately 7% higher, and the intake grille area was larger. The coolant outlet temperature of Mirai was lower than that of Roewe 950, which was beneficial for the long term and stable operation of a fuel cell. This comparative study provided guidance for the intake grille and radiator design of fuel cell vehicles. The only difference between fuel cell vehicles on the market and conventional vehicles was that in the former, the internal combustion engine was replaced with a fuel cell stack, which had insufficient heat transfer capacity because of the reducing temperature difference. Increasing the intake grille area and the heat exchange capacity of the radiator were the key issues for the development of fuel cell vehicles. In this study, an optimal window opening angle of the radiator fin of 23° provided a maximal heat transfer coefficient. 相似文献
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Brant A. Peppley 《International Journal of Green Energy》2013,10(2):201-218
Fuel cells can be highly efficient energy conversion devices. However, the environmental benefit of utilising fuel cells for energy conversion is completely dependent on the source of the fuel. Hydrogen is the ideal fuel for fuel cells but the current most economical methods of producing hydrogen also result in the production of significant amounts of carbon dioxide. Utilising biomass to produce the fuel for fuel cell systems offers an option that is technically feasible, potentially economically attractive and greenhouse gas neutral. High-temperature fuel cells that are able to operate with carbon monoxide in the feed are well suited to these applications. Furthermore, because they do not require noble metal catalysts, the cost of high-temperature fuel cells has the greatest potential to become competitive in the near future compared to other types of fuel cells. It is, however, extremely difficult to assess the economic feasibility of biomass-fuelled fuel cell systems because of a lack of published cost information and uncertainty in the predicted cost per kW of the various types of fuel cells for large volume production methods. From the scant information available it appears that the current cost for fuel-cell systems operating on anaerobic digester gas is about US$2,500 per kW compared to a target price of US$1,200 required to compete with conventional technologies. 相似文献
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Lasse Okkonen 《Journal of Environmental Planning and Management》2008,51(2):221-232
This paper presents a change in the Scottish forestry policy from the exogenous to the endogenous development approach, and feasibility of heat entrepreneurship based on locally produced woodfuels in the Highlands of Scotland. The cost structure and heat pricing in the case of an 800 kW solid fuel boiler is presented, and the profitability of local heat entrepreneurship is analysed with scenarios of different investment costs and fuel prices. The results indicate that a district heating (DH) system, using locally produced woodchips, could produce heat at a lower price than single-house heating systems using light fuel oil. The profitability of replacing existing heating units by investing in a new district heating (DH) scheme is very dependent on the available investment support, price level of woodchips and substituted light fuel oil, and the amount of sold energy. In the case of an 800 kW DH scheme, and woodchip prices of 14 and 22 €/MWh, investments should remain under break-even points of 280 and 420 €/kW of heating power (230,000–335,000€). 相似文献
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ARJA VAINIO-MATTILA 《Natural resources forum》1988,12(4):339-344
This paper examines the different perceptions on deforestation and the household fuel crisis from the point of view of the development planners and the main user group of household fuels in developing countries — women. It is argued that afforestation strategies designed to deal with the environmental deterioration are not the most appropriate response to the household fuel shortage. It is suggested that this shortage, which in many parts of the world has reached a crisis, can only be adequately responded to by strategies which allow for the increased access to, and control over, productive resources by women. 相似文献