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研究了氢腐蚀后20G和15CrMo钢力学性能与显微组织的变化;并用扫描电镜分析了拉伸断口的特征.结果表明:20G钢力学性能的下降是由于氢蚀造成珠光体的减少和裂纹的出现;并使断裂机制发生了韧性向脆性的转变.15CrMo钢具有较强的抗氢腐蚀能力,力学性能的变化是因为严重的表面脱碳造成。抗拉强度的变化对整个氢蚀过程都敏感;而延伸率的变化仅在氢蚀前期敏感。 相似文献
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Power generation from renewable energy sources and fossil fuels are integrated into one system. A combination of technologies in the form of a carbon capture utilization (CCU)-combined power station is proposed. The technology is based on energy generation from fossil fuels by a coal power plant with CO2 recovery from exhaust gases, and pyrolysis of natural gas to hydrogen and carbon, completed by reverse water-gas shift for the conversion of CO2 to CO, which will react with hydrogen in a Fischer-Tropsch synthesis for synthetic diesel. The carbon from the pyrolysis can replace other fossil carbon or can be sequestered. This technology offers significant CO2 savings compared to the current state of technology and makes an environmentally friendly use of fossil fuels for electricity and fuel sectors possible. 相似文献
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To effectively decarbonize the electric sector, utilities will need to address the growing load shape challenges driven by the variability of many renewable resources. Behind-the-meter solutions, such as energy efficiency, demand response, electrification and storage, will play an important role in grid stability, but only if they can deliver changes in demand that meet the time and locational needs of the grid. This article will discuss how smart meter interval data, combined with open source methods and software, provide transparent measurement of savings load shapes (resource curves) that enable the integration of demand flexibility into energy, capacity and carbon markets, and as a transmission and distribution resource. This allows utilities to procure demand flexibility in the same way they procure other resources by leveraging a price signal and pay-for-performance to drive innovation and attract private investment. 相似文献
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《The Electricity Journal》2019,32(7):106622
Demand response can be an excellent flexible resource and can cost-effectively support a grid with high penetrations of variable renewable generation. Unfortunately, this potential has not yet been widely exploited, due to a number of obstacles at the wholesale and distribution levels. This article reviews those barriers and the prospects for better uptake of demand response. 相似文献
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“Decarbonizing” the world’s energy matrix is the strategy being implemented by most countries to reduce CO2 emissions and thus contribute to achieve the ultimate objectives of the Climate Convention. The evolution of the carbon intensity (Ic=CO2/GDP) in the period 1990–2007 was encouraging but not sufficient to reduce the growth of carbon emission. As a result of COP-15 in Copenhagen these countries (and regions) made pledges that could lead to more reduction: for the United States a 17% reduction in CO2 emissions by 2020 below the level of 2005; for the European Union a 20% reduction in CO2 emissions by 2020 below the 1990 level; for China a 40–45% reduction in the carbon intensity and for India a 20–25% reduction in carbon intensity by 2020. We analyzed the consequences of such pledges and concluded that the expected yearly rate of decrease of the carbon intensity follows basically the “business as usual” trend in the period 1990–2007 and will, in all likelihood, be insufficient to reduce carbon emissions up to 2020. 相似文献
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Brett Parkinson Mojgan Tabatabaei David C. Upham Benjamin Ballinger Chris Greig Simon Smart Eric McFarland 《International Journal of Hydrogen Energy》2018,43(5):2540-2555
In the near-to-medium future, hydrogen production will continue to rely on reforming of widely available and relatively low-cost fossil resources. A techno-economic framework is described that compares the current best practice steam methane reforming (SMR) with potential pathways for low-CO2 hydrogen production; (i) Electrolysis coupled to sustainable renewable electricity sources; (ii) Reforming of hydrocarbons coupled with carbon capture and sequestration (CCS) and; (iii) Thermal dissociation of hydrocarbons into hydrogen and carbon (pyrolysis). For methane pyrolysis, a process based on a catalytic molten Ni-Bi alloy is described and used for comparative cost estimates. In the absence of a price on carbon, SMR has the lowest cost of hydrogen production. For low-CO2 hydrogen production, methane pyrolysis is significantly more economical than electrochemical-based processes using commercial renewable power sources. At a carbon price exceeding $21 t?1 CO2 equivalent, pyrolysis may represent the most cost-effective means of producing low-CO2 hydrogen and competes favorably to SMR with carbon capture and sequestration. The current cost disparity between renewable and fossil-based hydrogen production suggests that if hydrogen is to fulfil an expanding role in a low CO2 future, then large-scale production of hydrogen from methane pyrolysis is the most cost-effective means during the transition period while infrastructure and end-use applications are deployed. 相似文献
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