共查询到19条相似文献,搜索用时 125 毫秒
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汽轮机发生的设备损坏事故大多与汽轮机进冷汽、冷水有关。汽轮机进冷汽、冷水后,轻者会增大汽轮机上、下缸温差,引起汽轮机动静摩擦,严重时则会发生汽轮机水击事故。2003年6月某电厂发生200MW机组高压转子弯曲事故,原因就是汽轮机冲转前主蒸汽过热度只有16℃,导致汽轮机进水。高压缸上、下缸温差增大。因此,在热电站的工艺设计中,布置管道时应采取有效措施防止汽轮机进水;在运行方面,应根据机组及系统的实际情况,找出汽轮机可能进冷汽、冷水的原因,制定有针对性的防范措施。 相似文献
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汽轮机可分为凝汽式汽轮机、背压式汽轮机和调节抽气式汽轮机三种。利用无回收焦炉尾部高温烟气的余热,选择恰当的汽轮机进行发电、供热,可以达到降低烟气排放温度、提高燃料能源综合利用的目的。 相似文献
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孙瑾 《化学工业与工程技术》2001,22(4):44-46
蒸汽纯度对透平机的运行有较大影响。蒸汽中的污染物来源于补充水及其中加入的化学品 ,以及工艺冷凝液夹带物等 ,污染物随蒸汽进入透平机后易造成流道结垢与腐蚀 ,导致透平机性能降低与损坏。加强蒸汽纯度的控制及停机后的保护是透平机长周期稳定运行的重要条件之一 相似文献
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To achieve safe operation and to improve economics it is imperative to monitor and analyze demand and supply of utilities
and to meet utility needs in time. The main objective of motor/turbine processes is to manipulate optimal balances on steam
and electricity in utility plants. The optimal operation of motor/turbine processes is by far the most important to improve
economics in the utility plant. In order to analyze motor/turbine processes, steady state models for steam generation equipment
and steam distribution devices as well as turbine generators are developed and analyzed in this work. In addition, heuristics
concerning various operational situations are incorporated in the models. The motor/turbine optimal operation system is based
on utility models and operational knowledgebase, and provides optimal operating conditions when the amount of steam demand
from various steam headers is changed frequently. The optimal operation system also produces optimal selection of driving
devices for utility pumps to reduce operating cost. 相似文献
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In this paper, we developed a hybrid model for the steam turbines of a utility system, which combines an improved neural network model with the thermodynamic model. Then, a nonlinear programming (NLP) model of the steam turbine network is formulated by utilizing the developed steam turbine models to minimize the total steam cost for the whole steam turbine network. Finally, this model is applied to optimize the steam turbine network of an ethylene plant. The obtained results demonstrate that this hybrid model can accurately estimate and evaluate the performance of steam turbines, and the significant cost savings can be made by optimizing the steam turbine network operation at no capital cost. 相似文献
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工业汽轮机变工况运行的研究及试验 总被引:1,自引:0,他引:1
汽轮机是将热能转化为机械能与电能的主要机械,近年来驱动用工业汽轮机在大型化工装置中得到广泛应用。在汽轮机实际运行当中,工况总是处在变化之中,分析了蒸汽初压变化及新鲜蒸汽温度变化对汽轮机的影响,并进行了蒸汽初压的调整试验,试验结果可为相关工程技术人员提供借鉴。 相似文献
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为深入了解汽轮机动叶内盐析颗粒的微观行为,本文以某超临界汽轮机高压级动叶为研究对象,应用计算流体力学与群体平衡模型耦合方法,对汽轮机动叶内盐析颗粒在流场中的分布进行数值模拟研究,获得了盐析颗粒在动叶内的粒径分布及不同负荷时叶片尾缘处盐析颗粒数量密度分布规律。模拟结果表明:在汽轮机动叶吸力面附近的盐析颗粒粒径较压力面附近盐析颗粒粒径小,且叶根处颗粒粒径小于叶顶处;动叶压力面的颗粒数量密度呈前缘点尾缘点处大、中间段小的分布规律,并且盐析颗粒在叶片上的数量密度分布最大值并不出现在组分数及粒径最大处,而是出现在平均粒径为110~150μm的盐析颗粒沉积位置处;当汽轮机30%负荷运行时,粒径40μm盐析颗粒的数量密度是其在汽轮机额定负荷运行时的1.5倍,而粒径140μm盐析颗粒的数量密度仅为汽轮机额定负荷运行时的80%。 相似文献