共查询到20条相似文献,搜索用时 46 毫秒
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干燥工序是纸面石膏板生产过程中的关键环节之一。该干燥过程可分为加速干燥阶段、等速干燥阶段和降速干燥阶段。本文在一些合理的简化条件下,利用传输原理对纸面石膏板干燥过程的三个干燥阶段分别进行了解析,并对其进行了数值模拟,为纸面石膏板干燥过程的在线控制提供了依据。 相似文献
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基于槽式聚光太阳能供热的烟丝干燥特性研究 总被引:3,自引:0,他引:3
为利用太阳能进行烟丝干燥,了解干燥过程中烟丝水分的变化规律,在槽式聚光太阳能供能基础上,进行烟丝干燥的特性研究。通过建立干燥模型,绘制干燥特性曲线,获取气流温度、速度及入口烟丝含水率等不同因素对烟丝干燥特性的影响。研究结果表明,当入口烟丝含水率和固气比不变时,气流温度(190~200℃)升高或气流速度(15~20 m/s)增加,烟丝含水率下降速度也相应增加(即干燥速率加快);当入口烟丝含水率变化时,烟丝干燥速率基本保持不变。该文所建立的模型模拟结果与实验结果吻合较好。 相似文献
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我国能源发展的风险影响因素与预警系统分析 总被引:1,自引:0,他引:1
本文从3个角度分析了我国能源发展中存在的风险;以能源资源储量、能源生产效率、可再生能源开发、政治能源外交、国际能源交易等为主的能源供给角度;以经济增长方式、能源利用效率、节能政策与节能设备等为主的能源利用角度;以能源环境污染、清洁替代能源等为主的环境保护角度。在此基础上,讨论了以能源供需平衡和价格波动、单位产值能耗、能源需求增长速度等为指标的预警系统构建思路。 相似文献
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欧洲可持续能源政策及对我国的启示 总被引:4,自引:0,他引:4
国家发展和改革委员会赴欧洲考察团 《中国能源》2003,25(4):4-7
欧洲能源政策的目标是力求在不增加能源供应总量的前提下保持经济持续发展,保障能源供应安全、加强环境保护和提高经济竞争力。在管理体制上建立了负责能源政策研究、制订、实施和监督的专门机构。最重要的措施是节能和发展可再生能源,重点领域包括建筑节能、企业节能、热电联产和可再生能源。欧洲可持续能源政策对我国的能源发展有一定借鉴意义,我们的能源政策应在保障满足经济和社会发展需要的同时,提高能源效率,发展清洁能源,加强能源与环境的协调,并在体制上为可持续能源战略的实施消除障碍。另外,还应考虑建立清洁能源基金等措施为可持续能源政策的实施提供资金保障。 相似文献
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对传统能源的不可持续供应进行了说明,介绍了几种可以永续造福人类的可再生能源和新能源,包括:太阳能、风能、生物质能、水能、地热能、海洋能、氢能、受控核聚变能。 相似文献
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An overview of ocean renewable energy resources in Korea 总被引:2,自引:0,他引:2
Gunwoo KimMyung Eun Lee Kwang Soo LeeJin-Soon Park Weon Mu JeongSok Kuh Kang Jae-Gwi SohHanna Kim 《Renewable & Sustainable Energy Reviews》2012,16(4):2278-2288
Korea relies on imported fossil fuels to meet its energy consumption demands. As such, there is a need to investigate alternative energy resources such as renewable energy. In this paper, assessments of the potential of various ocean renewable energy resources in the sea around Korea; potential sources of energy including wave energy, tidal energy, tidal current energy and ocean thermal energy. Tidal energy and tidal current energy are likely to play an important role in meeting the future energy needs of Korea, whereas the potentials of wave energy and ocean thermal energy for the same are relatively low. The level of technical development and the renewable energy market in Korea is currently in an early stage. The government will have to be more aggressive in the promotion of renewable energy to achieve sustainable development in Korea. 相似文献
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The pricing mechanism for energy is not in line with the international standards, because the energy prices are controlled by the government partly or completely in China. Chinese government made a lot of efforts to improve the pricing mechanism for energy. The relations between Chinese energy prices and energy consumption are the foundations to reform the mechanism. In this paper, the relations between Chinese energy consumption and energy prices are researched by cointegration equations, impulse response functions, granger causality and variance decomposition. The cointegration relations among energy prices, energy consumption and economic outputs show that higher energy price will decrease energy consumption in Chinese industrial sectors but will not reduce the economic output in the long run. The cointegration relation between energy price and household energy consumption shows that higher energy price will decrease household energy consumption in the long run and increase it in the short run. So Chinese government should deepen the reform of pricing mechanism for energy, and increase the energy prices reasonably to save energy. 相似文献
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The purposes of this study are to look into the actuality of rural residential energy consumption in Hunan province, China, to improve rural residential energy utilization structures, and to protect the environment. An investigation on rural residential energy consumption was carried out in the villages of Xintian and Jiangwan in the spring and summer of 2005. Biomass energy is used in Xintian while biogas is popularized in Jiangwan. A questionnaire survey covered basic information of residences in the two villages, and energy consumption data of each family in the spring and summer were also recorded continuously. The characteristics of energy utilization structures of the two villages, the one with biomass energy utilization structure and the other with the ecotype energy utilization structure, are contrasted, and seasonal variance characteristics of energy consumption in spring and summer are analyzed. Sequentially, influence factors of rural residential energy consumption are further discussed qualitatively and quantificationally. Environmental benefit is assessed finally when biogas substitutes biomass energy. Conclusions are summarized as follows: In Xintian, a complicated energy structure is still dominant, where biomass energy accounts for a significant proportion and manifold energy resources exist simultaneously; the energy consumption is high; categories of energy resources used by households vary between spring and summer. The energy structure is definitely better in Jiangwan, where the ratios of commercial energy and ecotype energy used are both higher than those in Xintian and the ratio of biomass energy is smaller. Categories of used energy resources are also more constant in spring and summer. The total energy use amount of each season in Xintian is larger than that in Jiangwan respectively, while there is little difference in the efficiency energy use amount of each season between the two villages. Qualitative and quantitative analyses show that the accessibility of local energy resources, the domestic economical level, governmental energy policies, and consumption conceptions of farmers affect energy utilization structures definitely, while the efficiency of cookers, the number of family members, and annual income have effect on energy consumption amounts. Environmental analysis shows that the usage of biogas makes a great contribution in optimizing the energy consumption structure, reducing energy consumption, discharging less harmful gases and keeping the ecosystem in balance. The comparison between biomass energy and ecotype energy provides instructions for future development of rural residential energy consumption in China. 相似文献
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我国当前的能源问题及未来能源发展战略 总被引:7,自引:0,他引:7
能源短缺、能源安全、农村和偏远地区的能源供应、以煤为主的不合理能源结构、能源消费对环境的影响以及能源利用效率是我国能源领域面临的问题。全面解决这些问题,需要制定适合中国国情的中国能源发展战略,其内容应包括:合理的能源供应路线,从国内外两个方面保证能源安全;优化能源结构,提高清洁、高效的优质能源的消费比例,使得能源消费能够协调经济与环境的可持续发展,并且因地制宜发展可再生能源保证农村和偏远地区的能源供应;提高能源效率,推进节能技术进步,发挥市场作用,促进能源效率提高;能源消费的环境友好性,这有赖于能源消费结构的优化和能源效率的提高。 相似文献
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本文主要阐述我国能源目前的状况,以及在节能行业如何适应新形势下对节能工作的新要求,正确地运用能源审计的科学方法去解决企业能耗过高,能源利用效率低下的难题。重点说明能源审计的方法不仅适用于政府对企业的用能状况的宏观监督与管理,同时也适用于企业对自身能料、物料合理配置,以达到节能降耗、提高能效的最终目的。 相似文献
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我国"十二五"期间要实现能源结构调整和电力发展方式的转变,大力发展清洁能源。应当说,新能源、可再生能源、非化石能源和新兴能源都是清洁能源,它包括洁净煤、天然气(含煤层气、页岩气、致密砂岩气等)、核电、水电、风能、太阳能、生物质能等。由于清洁能源大部分需要通过电力来实现,所以在清洁能源发展中电力部门必然是主力军。电力部门一是要研究开发清洁能源新技术,把清洁能源转变成安全、稳定、经济的电力;二是要使清洁能源生产出来的电力能为广大用户所接受。只有达到这两个条件,由清洁能源转变而来的电力才能提高其在电力总供应量中的比重。在IEA和BP的世界一次能源统计中,中国"非化石能源+天然气"的比重都非常低,均不到20%。统计数据反映出的中国能源结构的突出问题是煤炭比例太高,石油、天然气、核电比例太低。因此,与发达国家不同,中国改善能源结构、发展清洁能源的重点应该是主攻洁净煤技术(包括CCS),同时加快发展天然气、核能和水电。 相似文献