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在燃机运行过程中对排温度分散度的监视非常重要。本文分析了造成排烟温度分散度大的一般原因,阐述了排烟温度分散度大对燃机热部件的危害,同时还对控制系统中排烟温度分散度允许值的计算方法进行了简单的说明,最后对在运行过程中如何对排烟温度分散度进行监视进行了说明。 相似文献
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为了研究全工况下燃气轮机内部运行参数及其所具有的特性规律,以PG9351FA燃机为分析对象,建立具有冷气掺混的重型燃气轮机变工况运行精细模型。该模型采用半经验公式对燃机冷却空气掺混量进行估算,充分考虑了冷气掺混对透平性能的影响,以及马赫数、攻角对透平变工况运行时造成的气流参数变化及速度损失的修正。结果显示:所建模型的精度有所提高,利用其计算所得结果与厂家提供数据相比,数据误差可控制在±0.4%以内,可用于预估燃机在部分负荷工况下的运行特性。应用模型分析了透平背压变动对透平膨胀比分配、排气温度及输出功率(出功)的影响,得到了透平内部气体流动参数和性能参数以及分级特性规律,其结果更真实地反映了机组在特定运行策略是的全工况特性规律。 相似文献
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为了获得更好的微燃机性能,需要对排气温度进行很好的控制,采用自适应RBF神经网络PID控制器进行控制。建立了微型燃气轮机排气温度控制的数学模型,给出了一般的RBF神经网络,并引入径向基函数神经网络对PID控制的参数进行调整。通过将其应用于排气温度控制来证明所提出的控制策略的有效性。通过仿真模拟,排气控制系统的动态响应可以有效地提高,并且所提出的控制器的抗扰动性优于PID控制器。 相似文献
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由于振动或者外部自然环境的影响,风力发电机组在运行过程中所承受的载荷不确定,导致风力发电机组疲劳问题很复杂。文章基于雨流计数法和Palmgren-Miner线性累积损伤理论,对在役机组各部件的疲劳损伤预估计算。结合机组实际运行数据和部件疲劳损伤的预估值,采用神经网络算法和K-Fold算法建立预测模型,利用该模型可有效预测同一风场其他非标杆机组的部件损伤。结果表明,疲劳损伤的预测误差精度可控制在3%以内,为及时调整相关控制参数和控制策略提供了可靠的依据,进而保证机组运行的稳定性,使风机达到最佳的疲劳寿命。 相似文献
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西气东输一线的管道压气站中有10座"2+1"运行方式的燃驱压气站,2010年西气东输一线管道输量为1.68×1010m3,接近管道设计输量。经过对离心压缩机运行数据的分析,发现双燃驱站的燃机和压缩机在性能参数设计选择上的考虑欠周,燃机和压缩机不能同时运行在各自设计的工作区域,导致了西气东输管道能耗较高。冬季以双机运行为主,机组负荷率仅维持在40%~60%;而夏季以单机运行为主,负荷率可达到100%。本文提出了将双燃机站现有压缩机的机芯更换为大流量机芯的方案,可以解决因燃机-压缩机在性能参数上不匹配造成的能耗高的问题,且一年可收回投资成本。同时,建议实施夏季燃机进气制冷的改进方案,帮助改变夏季燃机运行工况,延长燃机的使用寿命。 相似文献
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Renewable energy power plants, such as wind turbine generator and photovoltaic system, have been introduced in isolated power system recently. The output power fluctuations of wind turbine generator and load deviations result in frequency deviation and terminal voltage fluctuation. Furthermore, these power fluctuations also affect the turbine shafting of diesel generators and gas‐turbine generators, which are the main components of power generation systems in isolated islands. For stable operation of gas‐turbine generator, the torsional torque suppression as well as power system stabilization should be considered. In this paper, the control strategy that achieves torsional torque suppression and power system stabilization is presented based on H∞ control theory. The effectiveness of the proposed control system is validated by numerical simulation results. Copyright © 2010 John Wiley & Sons, Ltd. 相似文献
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就1台GT13E2型燃气轮机发生的一起燃烧室及排气烟道爆炸事故进行了详细的分析,认为在控制油压力消失和燃烧室熄火的情况下,燃气轮机仍然不能发出跳机指令,进而在燃气轮机转速下降过程中发电机低频保护动作断开主变高压侧断路器,造成厂用电丢失,导致燃气轮机在燃油系统的事故水冲洗过程中发生爆炸。指出了爆炸的原因是由于制造厂燃气轮机控制系统逻辑及控制油管道设计错误,爆炸是设计错误发展的必然结果,以及事故处理和预防措施。 相似文献
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振荡燃烧是贫燃预混燃烧室普遍面临的不稳定燃烧现象,该现象会导致发动机振动,污染物排放加剧,喷嘴烧蚀等,因此需要对这种现象进行控制,以减小压力脉动。本文针对某型低排放燃烧室,以对值班燃料供给控制为核心,设计了一套振荡燃烧主动控制系统,并进行了试验研究。分析了燃烧室内压力脉动控制的影响因素和变化规律,试验研究表明:(1)该系统有效地抑制了燃烧室的压力脉动。(2)控制系统投入工作的相位不同时,抑制效果明显变化。(3)该系统对由贫燃燃烧不稳定引起的压力脉动有明显抑制效果,对其他原因引起的脉动无明显抑制效果。 相似文献
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为研究风气互补发电系统对电网的影响,首先搭建了由风电机组、燃气轮机、电网线路、静止无功补偿器、电力系统稳定器和大型水力发电机组成的仿真系统,并对该系统的负载侧和电网线路中部节点进行了稳定性分析。仿真结果表明,电网在加载了风气互补系统后运行能保持稳定,并能在发生短时故障后恢复到原来状态。该文为进一步研究风气互补系统与电网的相互影响提供了良好的模型基础。 相似文献
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Micro gas turbine (MGT) is widely used in small-scale distributed power systems because of its low emissions and fuel flexibility. However, the under-utilization of its exhaust heat and the low electric efficiency are the main bottlenecks that restrict its application. Additionally, the flexible switching between the power generated by the MGT and the power grid is also a key factor for keeping the secure operation of a distributed power station. Therefore, this paper conducted some experimental investigations of a 30 kW MGT to provide reference solutions for the above issues. This MGT is located at Shanghai Jiao Tong University (SJTU), which is designed by the Gas Turbine Research Institute of SJTU, and is manufactured by a turbo-machinery factory in Chongqing, China. The demonstration prototype is mainly composed of a single stage centrifugal compressor, a radial turbine, a combustor, a high-speed permanent magnet generator, and a control system. The results show that the MGT can achieve steady operation at a low rotational speed from 10000 r/min to 34000 r/min in the case of using oil lubricated bearings, which can greatly reduce the economic cost compared with the use of air bearings. At the same time, the ignition success rate of combustion chamber (CC) reaches 98% at a low rotational speed, and a wide range of stable combustion area can be obtained, because of the novel design method of combustor by referencing the way applied in an axial flow aero-engine. The MGT generating set can achieve functions, such as starting up, ignition, stable operation, loaded operation, grid-connection and stopping. This system also can realize flexibly switching from the start motor mode to the generator mode, and from grid-connected mode to off-grid mode, because the innovative multi-state switching control system is adopted. The above research work can make our state master independent intellectual property rights of micro gas turbine, rather than continue to be subject to the technological monopoly of the developed states, which can provide theoretical and experimental support for the industrialization of MGT in China. 相似文献