生物质气化耦合燃煤发电技术的应用

生物质气化耦合燃煤发电技术是生物质资源利用的重要发展方向。根据生物质气化耦合燃煤发电技术的原理,进行生物质气化耦合燃煤发电的实际应用,研究该技术在应用过程中存在的一些问题及对策,说明生物质气化耦合燃煤发电是生物质高效和经济的应用途径之一。     

生物质气化耦合燃煤发电技术方案研究

中国经济正处于高速发展的重要阶段,对电力资源的需求日益提升,但一味依赖化石燃料维持生产,无法让中国经济实现绿色转型.将生物质气化处理,并将其与燃煤进行耦合发电,已成为电力行业的研究重点.以此作为切入点,从发电原理、技术应用等多个角度展开系统性分析,旨在为中国电力行业提供技术研究方向,推动中国经济顺利转型.     

生物质颗粒与燃煤耦合发电技术研究

本文介绍了生物质燃料特性及生物质发电现状。对生物质颗粒与燃煤耦合发电技术进行了研究,分析了其对锅炉运行的影响,同时展望了我国生物质利用发展趋势。     

生物质发电技术发展探讨

联系生物质发电技术的发展趋势,分别对生物质直接燃烧发电技术、生物质与煤混合直燃发电技术和生物质气化发电技术进行深入分析,并对比生物质直燃技术和生物质气化技术的优劣势。     

基于生物质气化耦合发电的气化特性实践研究

在10 MW级生物质气化耦合燃煤发电工程项目上,考察了当量比、添加蒸汽、掺混秸秆对稻壳气化特性的影响。在当前的实验条件下,随着当量比在0. 14～0. 20的范围内增加时,CO、H_2和CH_4的体积分数均随之减少,燃气热值和气化效率也随当量比的增大而降低;添加适量蒸汽可以促进CO、H_2和CH_4及燃气热值的提高,气化效率则随蒸汽量的增加而升高;当秸秆掺混比例逐渐增加时,CO、H_2和CH_4的体积分数和燃气热值出现了不同程度的下降,气化效率也不断降低。     

浅谈生物质气化在发电技术应用

随着经济的发展,世界各国电力需求猛增,电力供应日益紧张,在这种环境下,通过气化发电技术,把生物质能转化为电能,既能大规模处理生物质废料,又能提供电力,具有明显的社会和经济效益。介绍了生物质气化发电技术的国内外发展现状,着重讲述了生物质气化发电技术的原理、特点和分类,以及各类生物质气化发电技术的特点,分析了生物质气化发电技术的社会效益及应用前景。指出在我国这样一个农业大国应该大力发展生物质气化发电技术。     

农业生物质气化发电技术应用分析

本文从农业生物质气化过程的特点出发，分析了各种气化发电系统的技术水平及技术关键，同时从经济及社会的角度，分析了各种农业生物质气化发电设备的效益，指出只要继续提高技术水平并降低成本，农业生物质气化发电技术将很快进入工业应用，并在开源节流方面发挥重要的作用。     

生物质气化发电技术的现状及发展趋势

简要介绍了国内外生物质气化发电技术的研究现状及发展趋势。生物质气化发电技术在发达国家已受到广泛重视,生物质联合循环发电技术（BIGCC）利用外燃机燃用生物质气,可避免高温气化气的除尘除焦难题,是一种比较先进的生物质能利用技术。根据我国国情,引进大型BIGCC并采用内燃机代替燃气轮机,是解决我国生物质气化发电规模化发展的有效手段之一。     

生物质直燃和混燃发电环境效益分析

利用生物质代替矿物燃料发电可以减少CO2和SO2的排放量。确定了燃煤机组CO2和SO2排放量基准,建立生物质发电的CO2和SO2的排放量模型及其偏差模型;计算不同发电方式下CO2和SO2的生成量及减排量;分析了气化炉气化效率对生物质发电CO2和SO2生成量的影响。结果表明,提高生物质发电效率和气化效率可以显著降低CO2和SO2的排放;生物质发电的环境效益明显优于燃煤发电,而生物质气化合成气与煤混燃发电的环境效益优于生物质直燃发电。     

10 MW生物质气化耦合燃煤机组发电装置性能试验研究

某电厂生物质气化耦合燃煤机组发电项目于2018年9月8日完成72 h满负荷试运,项目主体是循环流化床气化耦合系统及附属设备,为评价该耦合系统的综合性能,进行了额定负荷下的产气率、气化效率、热效率及对燃煤机组煤耗影响等性能试验。试验结果表明:额定负荷下,生物质气化耦合系统以50%稻壳+50%秸秆作为原料时,燃料量为8. 61 t/h,产气率为2. 09 m~3/kg,气化效率为70. 53%,热效率为87. 65%;以100%稻壳作为原料时,燃料量为8. 57 t/h,产气率为2. 15 m~3/kg,气化效率为70. 04%,热效率为88. 12%;气化耦合系统在75%～110%负荷范围内可稳定运行;气化耦合系统额定负荷、燃煤机组维持600 MW负荷的情况下,投运气化耦合系统后,减少标煤量3 291 kg/h;气化耦合系统额定负荷、燃煤机组维持500 MW负荷的情况下,投运气化耦合系统后,减少标煤量3 122 kg/h。     

风力发电技术的发展现状

阐述了风力发电技术发展的的现状；分析了风力发电迅速发展的原因；论述了当前风力发电所存在的几个问题，并提出了解决这些问题的有效方法。     

太阳能光伏发电之未来

2007年中国和世界太阳能光伏发电在技术、产业、市场和资源等方面都取得了新的进展;展望太阳能光伏发电的未来,应当重新审视光伏发电在我国能源结构中的战略地位;建议把支持光伏发电的快速发展和实施大规模应用作为应对当前和今后国际能源涨价的国策.     

浅谈中国风力发电的现状与发展前景

风力作为可再生能源,它对环境的保护以及能源结构的调整有着十分重要的意义.首先对中国的风能发布做了简单介绍,然后分析了中国风力发电的现状,最后指出了中国风力发电的未来发展趋势.     

Comparative assessment of future power generation technologies based on carbon price development

The long-term assessment of new electricity generation was performed for various long-run policy scenarios taking into account two main criteria: private costs and external GHG emission costs. Such policy oriented power generation technologies assessment based on carbon price and private costs of technologies can provide information on the most attractive future electricity generation technologies taking into account climate change mitigation targets and GHG emission reduction commitments for world regions.Analysis of life cycle GHG emissions and private costs of the main future electricity generation technologies performed in this paper indicated that biomass technologies except large scale straw combustion technologies followed by nuclear have the lowest life cycle GHG emission. Biomass IGCC with CO₂ capture has even negative life cycle GHG emissions. The cheapest future electricity generation technologies in terms of private costs in long-term perspective are: nuclear and hard coal technologies followed by large scale biomass combustion and biomass CHPs. The most expensive technologies in terms of private costs are: oil and natural gas technologies. As the electricity generation technologies having the lowest life cycle GHG emissions are not the cheapest one in terms of private costs the ranking of technologies in terms of competitiveness highly depend on the carbon price implied by various policy scenarios integrating specific GHG emission reduction commitments taken by countries and climate change mitigation targets.     

Thermodynamic and economic analyses of a coal and biomass indirect coupling power generation system

The coal and biomass coupling power generation technology is considered as a promising technology for energy conservation and emission reduction. In this paper, a novel coal and biomass indirect coupling system is proposed based on the technology of biomass gasification and co-combustion of coal and gasification gas. For the sake of comparison, a coal and biomass direct coupling system is also introduced based on the technology of co-combustion of coal and biomass. The process of the direct and the indirect coupling system is simulated. The thermodynamic and economic performances of two systems are analyzed and compared. The simulation indicates that the thermodynamic performance of the indirect coupling system is slightly worse, but the economic performance is better than that of the direct coupling system. When the blending ratio of biomass is 20%, the energy and exergy efficiencies of the indirect coupling system are 42.70% and 41.14%, the internal rate of return (IRR) and discounted payback period (DPP) of the system are 25.68% and 8.56 years. The price fluctuation of fuels and products has a great influence on the economic performance of the indirect coupling system. The environmental impact analysis indicates that the indirect coupling system can inhibit the propagation of NO_x and reduce the environmental cost.     

肿瘤冷冻消融器械的发展现状

本文综合介绍了冷冻消融的发展历程、机制、优劣势、应用范围,以及目前世界上最先进的肿瘤治疗产品及其原理和性能,如加拿大CryoCath公司用于消融肺静脉口的ArcticFront 球囊导管、美国Endocare公司的通过调节滑钮位置即可产生５种不同直径冰球的V－probe探针、以色列Galil－medical公司的１．４７mm直径探针、丹麦Metrum－cryoflex公司的Cryo－s系列冷刀、刘静研究组的冷热刀和“纳米冷冻”技术,并对冷冻消融将来的发展方向提出自己的见解。     

国内风力发电的现状和前景

分析了我国的风能资源和风力发电的现状，探讨了在风力发电时要注意的几个问题，并对我国风力发电的发展前景提出了看法。     

Variable speed DFIG wind energy system for power generation and harmonic current mitigation

This paper presents a novel approach for simultaneous power generation and harmonic current mitigation using variable speed WECS with DFIG. A new control strategy is proposed to upgrade the DFIG control to achieve simultaneously a green active and reactive power source with active filtering capability. To ensure high filtering performance, we studied an improved harmonic isolator in the time-domain, based on a new high selectivity filter developed in our laboratory. We examined two solutions for harmonic current mitigation: first, by compensating the whole harmonic component of the grid currents or second, by selective isolation of the predominant harmonic currents to ensure active filtering of the 5th and 7th harmonics. Simulation results for a 3 MW WECS with DFIG confirm the effectiveness and the performance of the two proposed approaches.     

Thoughts about future power generation systems and the role of exergy analysis in their development

In face of the likely doubling of the world population and perhaps tripling of the power demand over the next 50 years, this paper (1) presents some thoughts on the possible ways to meet the power demands under the constraints of increased population and land use while holding the environmental impact to a tolerable one, and (2) outlines the ways exergy analysis may be effectively used in the conception and development of such processes. To effectively develop the innovative power generation systems needed in the 21st century, irreversibility and exergy analysis should be much more focused on the intrinsic process details.