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为快速了解炉内煤粉燃烧的燃尽率和炉膛燃烧的温度分布,采用傅维标的煤种燃烧通用模型,从煤焦反应动力学入手,建立了沿炉膛高度方向的一维宏观模型。通过对煤粉的挥发分和煤焦燃烧的合理简化,考虑炉膛煤粉颗粒的燃烧的影响,以煤种的煤质参数作为计算参数,采用煤粒等密度模型,分别计算不同燃烧层的不同粒径煤粉颗粒在炉膛气氛下的燃烧速率,从而得到整个颗粒群在炉膛的燃烧情况。针对某电站褐煤锅炉的具体实例,将本模型计算得到的煤粉燃尽率和炉膛温度分布与现有文献的数据相符,并以此分析了主要操作参数对该锅炉煤粉燃尽率和炉膛温度分布的影响。 相似文献
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《能源工程》2016,(6)
运用CFD软件对某210 MW煤粉锅炉的燃烧过程进行三维数值模拟,针对锅炉实际存在温度分布不好、燃烧效率不高、结渣问题严重,对炉膛进行偏二次风、反切燃尽风及两者联用改进。结果表明:与设计工况相比,单独的小角度偏二次风改进下的炉膛燃烧区温度降低约300 K,水冷壁附近氧气浓度提高,减少了水冷壁的结渣和高温腐蚀;单独小风率反切燃尽风改造后的配风方式更合理,烟气的停留时间增加0.6 s,燃烧区温度提高约373 K,高温区域扩大,炉膛出口烟气热偏差系数减小约0.7%,提高了锅炉的燃烧效率和运行的安全性,但可能加重炉内结渣;二者联用改进既能够很好地改善炉膛的温度分布,扩大炉膛高温区域,提高燃烧区温度约353 K,同时能够减少燃烧器区域的结渣和高温腐蚀,减小炉膛出口烟气热偏差,采用二者联用改造对锅炉运行最为合适。 相似文献
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《可再生能源》2017,(11)
为了分析掺烧松木气对燃煤锅炉燃烧过程以及燃烧产物的影响,基于Fluent软件搭建了松木气与煤粉的混合燃烧模型,对300 MW燃煤锅炉的纯煤燃烧以及掺烧10%,20%,30%生物质气的4种工况进行数值模拟。在保证锅炉总输入热不变的情况下,得到了不同工况下锅炉炉膛内燃烧温度、烟气组分和NOx排放随炉膛高度的分布情况。模拟结果表明:与纯煤燃烧工况相比,掺烧松木气时炉内燃烧温度有明显下降,当掺烧比例分别为10%,20%,30%时,燃烧区域截面平均温度分别下降了46,88,104 K;掺烧松木气也会引起了烟气组分的变化,炉膛下部的O2体积分数明显增大,CO和CO2的体积分数明显减小;随着松木气掺烧比例的增加,锅炉炉膛出口处的NOx的质量浓度分别下降了47,148,198 mg/m3。 相似文献
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本文对热水锅炉锅水汽化原因及目前的研究现状进行了文献综述。利用CFD(计算流体力学)技术,对QXL-14-1.0/115/70-AⅡ型管架式锅炉内部水循环系统进行模拟分析,并与额定设计运行参数进行了对比验证。研究发现:在正常运行状态(工况一)和回水流量降低60%(工况二)的情况下,模拟得到的热水锅炉管道内部温度场和速度场与锅炉设计额定参数基本一致;工况一中锅筒尾部第一根侧墙水冷壁和前墙水冷壁温度较高;工况二中侧墙水冷壁中上部温度较高,此处容易发生超温汽化;工况二中由于水流量下降,容易在侧墙水冷壁上部形成超温汽化现象,且锅炉管道和锅筒内积聚了大量水蒸气,使热水锅炉的正常使用功能遭到严重破坏。 相似文献
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为了满足多学科、多层次的船用燃气轮机仿真分析需求,运用分布式集成仿真和多软件协同仿真的方法,对燃气轮机总体性能集成仿真平台进行设计研究。使用C#语言在.Net平台上对仿真平台应用层进行开发,以商用仿真软件与Sql Server数据库为支撑层,使用web服务协议和改进的多软件协同仿真接口作为通讯层以及由服务器、计算节点和网络设备组成的设备层,这四个层次组成了平台的体系结构。基于MVC(Model View Controller)框架和B/S(Browser/Server)架构,设计了平台的运行框架。平台能够实现网络环境下的燃气轮机高效率高精度的性能分析。通过间冷燃气轮机装置在发电负载下变工况分布式集成仿真方案,初步验证了平台体系框架的合理性和有效性。 相似文献
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Dr. Peter Apian-Bennewitz Dr. Manuel Goller Dipl.-Ing. Sebastian Herkel Dr. Anne Kovach-Hebling dipl. Ing. Jan Wienold 《Renewable Energy》1998,14(1-4)
Advanced computer simulation tools for analyzing daylighting features and thermal performance of buildings are improved at the Fraunhofer Institute for Solar Energy Systems. For an analysis of daylighting elements in lighting simulations, new light-deflecting structures and materials have been measured and modeled. In order to study the interaction between lighting and thermal behaviour of rooms, thermal and lighting simulation techniques are linked together. Thus, integrated energy concepts can be evaluated. Programs for handling parallel image generation in a network of high-performance Unix workstations have been developed. 相似文献
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基于实际道路激励谱的摩托车平顺性混合仿真分析 总被引:2,自引:0,他引:2
应用道路模拟试验技术、有限元分析法和多体动力学仿真技术建立了摩托车平顺性混合仿真分析模型,并验证和改进了仿真模型;根据相关文献和标准探索了摩托车平顺性客观评价方法,最后对摩托车平顺性仿真进行了客观评价. 相似文献
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张青 《柴油机设计与制造》2011,17(2):43-46
介绍了离散制造系统的建模仿真技术以及系统仿真工具Plant Simulation,并以凸轮轴生产线为例进行仿真建模与分析,展现了建模仿真技术在制造系统中的良好应用前景. 相似文献
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Simulations of power systems with high wind penetration need to represent the stochastic output of the wind farms. Many studies use historic wind data directly in the simulation. However, even if historic data are used to drive the realized wind output in scheduling simulations, a model of the wind's statistical properties may be needed to inform the commitment decisions for the dispatchable units. There are very few published studies that fit models to the power output of nation‐sized wind fleets rather than the output at a single location. We fitted a time series model to hourly, time‐averaged, aggregated wind power data from New Zealand, Denmark and Germany, based on univariate, second‐order autoregressive drivers. Our model is designed to reproduce the asymptotic distribution of power output, the diurnal variation and the volatility of power output over timescales up to several hours. For the cases examined here, it was also found to provide a generally good representation of the overall distribution of power output changes and the variation of volatility with power output level, as well as an acceptable representation of the distribution of calm periods. Copyright © 2011 John Wiley & Sons, Ltd. 相似文献
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Roberto Grena 《Solar Energy》2009,83(8):1186-1199
A transient simulation of the heat transfer in a particle directly heated by the sun, in a falling-particle receiver, is presented. The local temperature can have a non-uniform distribution, that depends on many factors, such as the size of the particle, its rotation, and the exposition time. This fact should be considered when studying the material resistance and aging, or direct chemical reactions in the falling particle. The single-particle simulation presented here can be useful to test the validity of the global fluid dynamics simulations, to study single-particle related aspects such as aging, thermal stresses and chemical stability, to study the distribution of temperature if the particles are not uniform in size, or to study the efficiency in chemical applications. 相似文献
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以平圩电厂1号机组为研究对象,采用APROS仿真支撑系统,通过分析机组启动过程中汽缸和转子的膨胀特点,开发出600MW火电机组的汽轮机高压差胀的全工况模型,并在培训中取得良好效果。 相似文献