共查询到17条相似文献,搜索用时 546 毫秒
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新型双燃料重整联合循环发电系统 总被引:2,自引:1,他引:1
本文提出了一种新型双燃料重整联合循环发电系统。该系统通过重整反应实现了煤和天然气的综合利用,煤的燃烧过程为天然气/水蒸汽重整反应提供了高温反应热,通过双燃料重整煤的部分化学能间接转化到合成气中,然后合成气进入联合循环燃烧作功。研究结果表明双燃料联合循环的供电效率为49.4%-53.2%,煤的折合供电效率为42.4%-44.6%,与IGCC(动力部分相同时为44%-46%)相比供电效率降低1-2个百分点,但是投资大约降低30%。本文的研究开拓性地为煤的清洁高效利用提供了新途径。 相似文献
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《工程热物理学报》2015,(12)
本文提出一种基于太阳能驱动生物质气化的新型发电系统,利用塔式定日镜场聚光产生1000~1500 K高温太阳热能驱动生物质进行气化反应,并集成先进燃气-蒸汽联合循环发电系统高效利用气化合成气。对该系统进行了热力学性能分析,结果表明:与常规生物质气化方式相比,通过驱动生物质发生气化反应,不仅将间歇性的太阳能转化为稳定的合成气化学能,并增加了气化合成气的化学能,同时合成气中的H_2和CO的摩尔含量之比在气化温度为1000~1500 K时达到1.65~2.44,有利于直接合成甲醇等清洁液体燃料。在设计工况下,系统的太阳能热功转化效率将达到23.68%,随着气化反应温度的升高,系统的太阳能份额和输出的电功率增大,系统的总热效率和总效率均下降。研究成果将为高效利用我国西部丰富的太阳能与生物质能提供一条有效途径。 相似文献
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本文开拓性地提出了一种新型多种化石能源输入(煤和天然气)、多种产品输出(电力和化工产品)的多功能能源系统。该系统将天然气/水蒸气重整过程和煤的燃烧过程有机整合,用煤燃烧替代了传统重整过程清洁的燃料天然气和弛放气燃烧,实现了煤和天然气的综合互补利用;将甲醇生产系统与发电系统有机整合,实现了化工系统弛放气的梯级利用同时,对甲醇生产系统余热进行了更加有效的利用。研究表明生产相同量的甲醇和电,多功能系统比参比系统少消耗 20%的天然气。本文工作为煤和天然气综合高效利用提供了新途径. 相似文献
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针对高温太阳能与天然气热化学互补分布式能源系统存在聚光比高、互补反应温度高、变工况性能不稳定的技术瓶颈,本文探索了一种能实现主动调控的中温太阳能与天然气互补的化学链重整冷热电联产系统。利用约500℃太阳热能驱动天然气基-氧化镍化学链重整,生成合成气太阳能燃料,通过燃气轮机冷热电联产系统,实现中温太阳能与天然气综合梯级利用.研究结果表明:在设计点工况条件下,系统的总能效率可达到80.9%,太阳能集热面积节约率达到53.2%,太阳能净发电效率可达27.3%.分析了关键参数如NiO和甲烷摩尔比(Ni/C)和太阳辐照强度(DNI)对系统热力学性能的影响。 相似文献
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本文根据生物质能源具有的自身特点,提出一个适合生物质能源利用的新型多联产系统.在原有天然气基甲醇生产系统中增加生物质气化子系统,充分利用天然气-水蒸气重整与生物质气化制取合成气中碳氢有效成分互补的特点,通过合理配气满足最佳的甲醇合成要求,因此屏蔽掉了变换,补碳,脱碳等分产必需的工艺过程,同时借助动力系统实现未反应气的合理利用,在满足较高的甲醇产率前提下降低了化工产品能耗,动力系统借助化工过程克服燃料燃烧过程品位损失过大的难题,是组分对口分级转化能量梯级利用的本质体现.针对不同天然气生物质输入比情况下合成气一次性通过,以及最佳输入比情况下未反应气适度循环两种方案,本文分别进行了深入分析,具有8%~14%的节能潜力.为生物质能的高效应用以及缓解能源危机提供了一条有效的途径. 相似文献
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Methane steam reforming has been studied over a range of nickel/ceria-gadolinia cermet anodes, over the temperature range
500–700 °C appropriate for intermediate temperature ceriagadolinia based SOFCs. The influence of operating temperature and
methane/steam ratio on the reforming characteristics, methane conversion and product selectivity, and the carbon deposition
on the anode during reforming, has been determined for each anode.
Nickel/ceria powders made from gas atomised intermetallic precursors have been studied as potential anode materials for intermediate
temperature ceria-gadolinia based SOFCs running on natural gas. The powders have been characterised structurally and evaluated
for their methane reforming characteristics and their resistance to carbon deposition during internal reforming, especially
at low steam/methane ratios, over the relevant operating temperature ranges of ceriagadolinia based SOFCs. Their performance
has been compared to conventionally prepared anodes and anodes generated from cast alloys, with very favourable results.
Paper presented at the 9th EuroConference on Ionics, Ixia, Rhodes, Greece, Sept. 15 – 21, 2002. 相似文献
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I. A. Bassina Yu. P. Malkov O. N. Molchanov S. G. Stepanov G. A. Troshchinenko I. M. Zasypkin 《Thermophysics and Aeromechanics》2014,21(2):249-254
Thermodynamic studies of the converter characteristics were performed to produce hydrogen-containing syngas from hydrocarbon fuel (kerosene) with its separated supply for thermo-oxidative and steam reforming. It is demonstrated that the optimal conditions of the converter performance correlate with the oxidant ratio of α > 0.5 at the heattransfer wall temperature of 1200 K. Hydrogen content in the final syngas reaches 60 % by volume, free carbon (soot) deposition in reforming products is excluded, and there is no need to apply walls water cooling in the converter. 相似文献
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Christopher R. Shaddix Ethan S. Hecht Cristina Gonzalo-Tirado Brian S. Haynes 《Proceedings of the Combustion Institute》2019,37(3):3071-3079
Apparent char kinetic rates are commonly used to predict pulverized coal char burning rates. These kinetic rates quantify the char burning rate based on the temperature of the particle and the oxygen concentration at the external particle surface, inherently neglecting the impact of variations in the internal diffusion rate and penetration of oxygen. To investigate the impact of bulk gas diffusivity on these phenomena during Zone II burning conditions, experimental measurements were performed of char particle combustion temperature and burnout for a subbituminous coal burning in an optical entrained flow reactor with helium and nitrogen diluents. The combination of much higher thermal conductivity and mass diffusivity in the helium environments resulted in cooler char combustion temperatures than in equivalent N2 environments. Measured char burnout was similar in the two environments for a given bulk oxygen concentration but was approximately 60% higher in helium environments for a given char combustion temperature. To augment the experimental measurements, detailed particle simulations of the experimental conditions were conducted with the SKIPPY code. These simulations also showed a 60% higher burning rate in the helium environments for a given char particle combustion temperature. To differentiate the effect of enhanced diffusion through the external boundary layer from the effect of enhanced diffusion through the particle, additional SKIPPY simulations were conducted under selected conditions in N2 and He environments for which the temperature and concentrations of reactants (oxygen and steam) were identical on the external char surface. Under these conditions, which yield matching apparent char burning rates, the computed char burning rate for He was 50% larger, demonstrating the potential for significant errors with the apparent kinetics approach. However, for specific application to oxy-fuel combustion in CO2 environments, these results suggest the error to be as low as 3% when applying apparent char burning rates from nitrogen environments. 相似文献
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燃气轮机的燃烧噪声是反映燃烧室燃烧稳定性的主要参数.本文对国内某座煤基IGCC示范电站的40 MW级燃气轮机在诸多运行条件下的燃烧噪声进行了现场测试,分析了气液双燃料喷嘴在燃烧轻柴油、燃烧合成气以及油气切换过程中燃烧室的燃烧噪声,另外分析了合成气掺烧驰放气与合成气加湿对燃烧稳定性的影响.结果表明:合成气燃烧室在油气切换过程中燃烧噪声会增加,但距离振荡燃烧的阈值仍有很大的裕度;烧合成气时随着燃气轮机功率增加燃烧噪声降低;合成气加湿时随着蒸汽流量增加污染物NOx排放显著降低,并且燃烧噪声也有降低的趋势. 相似文献
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A. G. Korotkikh K. V. Slyusarskiy A. A. Ditts 《Russian Journal of Physical Chemistry B, Focus on Physics》2016,10(4):576-581
Solid fuel samples with different carbon contents are gasified by successively subjecting to pyrolysis in argon and oxidation in carbon dioxide at various temperatures to determine the rate of the chemical reactions and the activation energy required for simulating and optimizing the operation of gas generators. The samples were prepared from bituminous coal, lignite, and anthracite of the Kuznetsk and Kansk-Achinsk coal basins. The gasification of coal char samples in a carbon dioxide medium at 900–1200°C is analyzed by thermogravimetry. The temperature dependences of the weight change rate and gasification time of coal char samples are measured and used to calculate the preexponential factor and activation energy of the carbon oxidation reaction. It is found that, with increasing oxidizing medium temperature from 900 to 1200°C, the gasification time of the coal char samples obtained from anthracite and bituminous coal decrease 8- and 22-fold, respectively. A physicomathematical model of coal char gasification in a fixed bed, with the oxidizing gas diffusing through the ash layer formed, is proposed. 相似文献