降低燃气轮机空气进口温度提高发电功效的方法

燃气轮机的性能与环境温度密切相关,环境温度越高,燃气轮机的出力越低,因此,降低燃气轮机的空气进气温度,可提高其发电功率和效率。本文简要的从热力学角度分析其原因,同时介绍降低燃气轮机空气进口温度的方法。     

阳城电厂厂用电切换

介绍了阳城电厂厂用电切换的特殊性，分析了试验研究结果及具体实施方案的可行性。     

Thermodynamic performance assessment of an indirect intercooled reheat regenerative gas turbine cycle with inlet air cooling and evaporative aftercooling of the compressor discharge

This study provides a computational analysis to investigate the effects of cycle pressure ratio, turbine inlet temperature (TIT), and ambient relative humidity (φ) on the thermodynamic performance of an indirect intercooled reheat regenerative gas turbine cycle with indirect evaporative cooling of the inlet air and evaporative aftercooling of the compressor discharge. Combined first and second‐law analysis indicates that the exergy destruction in various components of gas turbine cycles is significantly affected by compressor pressure ratio and turbine inlet temperature, and is not at all affected by ambient relative humidity. It also indicates that the maximum exergy is destroyed in the combustion chamber; which represents over 60% of the total exergy destruction in the overall system. The net work output, first‐law efficiency, and the second‐law efficiency of the cycle significantly varies with the change in the pressure ratio, turbine inlet temperature and ambient relative humidity. Results clearly shows that performance evaluation based on first‐law analysis alone is not adequate, and hence more meaningful evaluation must include second‐law analysis. Decision makers should find the methodology contained in this paper useful in the comparison and selection of gas turbine systems. Copyright © 2006 John Wiley & Sons, Ltd.     

煤氧喷枪中心氧管参数之间的关系

利用等截面管中氧气射流理论公式对影响煤氧喷枪中心氧管氧气流动的主要参数进行计算。计算结果表明：氧气出口马赫数及氧气入口压力与氧管内径、氧气流量、炉内操作压力以及氧气入口温度等因素有关。同时推出计算氧气出口马赫数和氧气入口压力的显式函数公式：Ｍ２＝Ｑ＾０．８９６３９Ｔ１＾０．４２４８５／ｐ３＾０．８７３３４Ｄ＾１．８２７１２×４．３４００７×１０＾－８ ｐ１＝Ｔ１＾０．４９１７９ｐ３＾０．１３６８１     

Comparison of the TSI Model 3306 Impactor Inlet with the Andersen Cascade Impactor: solution metered dose inhalers

The product performance of a series of solution Metered Dose Inhalers (MDIs) were evaluated using the TSI Model 3306 Impactor Inlet and the Andersen Cascade Impactor (ACI). The goal of the study was to test whether the fine particle and coarse particle depositions obtained using the Model 3306 were comparable to those results obtained by ACI testing. The analysis using the Model 3306 was performed as supplied by the manufacturer as well as with 20 cm and 40 cm vertical extensions that were inserted between the Model 3306 and the USP Inlet. Nine different solution formulations were evaluated. The drug concentrations ranged from 0.08 to 0.8% w/w and the ethanol cosolvent concentration varied between 5 and 20% w/w. In general, it was found that good correlations between the two instruments were obtained. However, for formulations containing 10-20% w/w ethanol it is shown that an extension fitted to the Model 3306 yielded an improved correlation to those obtained from the ACI.     

人工神经网络在预测流动沸腾曲线中的应用

选用20世纪60年代以来的实验数据，应用人工神经网络分析入口欠热度、质量流速、压力等主要参数对沸腾曲线的影响。在整个传热区内，热流密度随入口欠热度的增加而增大；在过渡沸腾和膜态沸腾区，热流密度随质量流速的增加而增加；压力起重要的作用，除膜态沸腾区外，增加压力能强化传热。除泡核沸腾外，稳态和瞬态的流动沸腾曲线的差异很小。     

TRT运行技术的拓展与开发

着重介绍了传统TRT运行技术在本钢使用时存在的弊端以及TRT技术在本钢燃气厂应用过程中得到的拓展与开发，采用低压启动技术解决传统高压启动技术TRT机组启动困难的难题，介绍了比肖夫洗涤系统串联TRT工艺新的控制技术，采用静叶调节透平机入口压力给本钢带来的显著经济效益。     

MS6001燃气轮机机组进口导叶的控制

简要介绍了MS6001燃气轮机机组压气机可调进口导叶(VIGV)的控制。重点介绍了燃气轮机起动过程中出现的VIGV 3种不同开度的情况和带负荷时2种不同运行方式对燃气轮机背压的影响。     

含侧向支柱冲压增程弹用进气道复杂流场数值模拟

采用块结构网格与二阶精度流场分区求解技术,对含侧向支柱冲压增程弹丸进气道内外复杂流场进行了数值模拟。通过数值模拟得到了对应于不同来流马赫数和攻角情况下,临界工况时,超声速进气道内外粘性流场复杂的波系结构。当进气道扩压段有侧向支柱存在时,进气道总压恢复系数和动能系数均有所降低,而流场畸变指数则显著增大。由于攻角的存在,进气道总压恢复系数和动能系数均有所降低,而流场畸变指数则明显增大。     

涡壳式旋风预热器单体三维气相场的数值模拟

借助流体力学计算软件,对新型干法水泥生产线上普遍采用的五边形入口、三心大涡壳式旋风预热器,模拟计算了其内部的气相流动行为.针对该类型旋风预热器本身非轴对称性、内部流场为三维强旋流的特点,在结构建模时,采用非结构化四面体网格离散计算域;在计算模型的选择上,采用雷诺应力输运模型.模拟计算结果表明:与其他领域应用的旋风分离器相比,五边形入口、三心大涡壳式旋风预热器内筒入口附近次级流动相对较弱;其内部的切向速度是经过涡壳的收缩引导使气流切向旋转迅速加速达到峰值;推算出模拟用Ⅰ级旋风筒的阻力系数ζ≈9.22.