In order to investigate the cooling mechanism of the turbine blade and to enrich and supplement the experimental study of the blade, a numerical study of a steam-cooled blade with five cooling channels was carried out based on the response surface model. The surface cooling efficiency and dimensionless temperature distribution of the steam-cooled blade were obtained with different mainstream inlet temperature, outlet pressure, pressure ratio of inlet to outlet, temperature ratio and flow ratio of steam to mainstream by using the flow-solid coupling numerical method. The influence of the working parameters on the cooling performance of air-cooled blade and steam-cooled blade, including the average cooling efficiency, temperature non-uniformity, and average dimensionless temperature, was comparatively investigated; the correlation equation of the working parameters on the cooling performance of the steam-cooled blade was obtained. The results show that the influence of mainstream inlet temperature and outlet pressure on the cooling performance of the steam-cooled blade is not significant; the cooling efficiency of the steam-cooled blade increases by 5.92%, 7.35% and 26.51% respectively as the mainstream inlet to outlet pressure ratio, the temperature ratio and the flow ratio of steam to mainstream increase; the dimensionless temperature increases by 3.74% as the temperature ratio increases and decreases by 0.93% and 4.09% as mainstream inlet to outlet pressure ratio and flow ratio increase; the temperature non-uniformity decreases by 4.09% and 30.08% respectively, as the mainstream inlet to outlet pressure ratio and temperature ratio increase and increases by 37.99% as the flow ratio increases; the effect of working parameters on air-cooled blade and steam-cooled blade is the same, but the steam-cooled blade has 14.06–17.81% higher cooling efficiency, 18.47–29.01% higher temperature non-uniformity and 1.86–2.58% lower dimensionless temperature compared to the air-cooled blade under the same working parameters; the correlation equation obtained by fitting the response surface model has higher accuracy.
励磁系统的运行与发电机及电力系统稳定性息息相关.EX2100e系统是目前GE公司燃气轮机的主流励磁控制系统,该系统封装程度高、输出信息少,与国产励磁系统差异较大,不利于运行维护人员及时发现并处理故障.针对这种情况,对该系统的保护逻辑、故障报警进行了分析梳理,并实施了故障预警优化方案,提升了系统的可靠性.
随着电力市场改革的不断深入,燃气机组在与燃煤机组竞争市场时成本劣势凸显.本文通过对天然气发电厂生产对标指标的研究与应用实例,有助于引导天然气发电厂重视企业生产技术管理的几个重要生产对标指标,用对标方法开展生产技术改造项目等全过程管理,用对标结果衡量天然气发电厂生产企业的绩效水平,从而提高企业综合竞争能力.
本文提出了一种基于相变仿真技术的排气降温装置设计优化方法.通过构建排气降温装置的几何参数化模型,搭建网格生成和CFD仿真的自动化流程,优化算法以驱动参数来实现对不同设计方案的自动寻优,最终获得最优的设计方案.以国内某重型燃气轮机燃烧试验台高温排气喷水冷却装置的设计为例,验证了该方法的有效性.该方法有利于降低设计门槛,缩短设计时间,提升设计质量.
某海上钻井平台燃气轮机在无风天气条件下能正常运转,在当地风速达到7 级(17 m/s)左右时,发生通风系统箱装体压差报警停机.通过研究燃气轮机箱装体压差探测原理,对燃气轮机通风系统整体进行数值模拟,重点分析外界风速的影响.综合得到故障原因为压差变送器在箱装体外的取样口受到风力影响,压差表示数不能正常反映风机工作情况,导致压差低报警停机.通过整改现场压差引压管位置,并多次验证,故障得到解决.
