汽轮机系统能耗分析与结构优化研究

发布时间：2018-05-04 05:43

本文选题：汽轮机系统 + 能耗分析　；参考：《华中科技大学》2015年硕士论文

【摘要】：近年来,我国非化石能源发电装机容量持续快速增长,火电装机比重开始下降,但火力发电在我国发电领域占据主导地位的现状短期内不会改变。我国火电机组的能耗水平不断下降,但与国外发达国家相比,尚有一定节能优化的空间。对燃煤发电机组的能耗分布情况进行定量地分析,有助于挖掘火电机组节能潜力的大小及其空间分布,从而为机组结构优化改造、实现节能减耗提供理论依据。本文以600MW的常规超临界机组为参考,利用建模仿真技术研究600MW超临界燃煤发电机组系统的能耗情况,并对机组汽轮机系统进行了结构优化改造。本文内容是从汽轮机系统能耗分析以及结构优化改造两个方面展开研究。首先,使用Matlab/simulink建模工具丰富和完善600MW汽轮机系统模型,以此为平台对600MW汽轮机系统进行了能耗分析。主要研究了抽汽压损、加热器散热损失,疏水冷却器等因素对系统能耗的影响,并进行了定量分析计算,结果表明,高压加热器的抽汽压损和散热损失对系统的经济性影响较大,加装疏水冷却器的经济性影响较小。通过对系统能耗分析的深入研究,提出对机组系统结构进行优化的方向,研究了混合式加热器以及低温省煤器两种结构优化方式,对三种混合式加热器改造方案和四种低温省煤器连接方案在THA工况下的节能效益进行了分析,对比出了较优的混合式加热器改造方案和低温省煤器连接方案。对两种优选方案在不同工况下的节能变化进行了计算分析,结果表明两种方案在低负荷下均保持较好的节能收益,并考虑分流系数对低温省煤器优选方案在各工况下的节能影响,计算得到了各工况下的最佳分流系数,为汽轮机系统的实际改造提供了理论指导。
[Abstract]:In recent years, the installed capacity of China's non-fossil energy power generation has been increasing rapidly, and the proportion of thermal power generation has begun to decline, but the status quo that thermal power generation occupies a dominant position in the field of power generation in China will not change in the short term. The energy consumption level of thermal power units in China is decreasing, but there is still room for energy saving optimization compared with developed countries. The quantitative analysis of the energy consumption distribution of coal-fired generating units is helpful to excavate the energy saving potential and its spatial distribution of thermal power units, thus providing a theoretical basis for the optimization of unit structure and the realization of energy saving and consumption reduction. Taking the conventional supercritical unit of 600MW as reference, the energy consumption of 600MW supercritical coal-fired generating unit system is studied by modeling and simulation technology, and the steam turbine system is optimized and reformed. In this paper, energy consumption analysis and structural optimization of steam turbine system are studied. Firstly, the Matlab/simulink modeling tool is used to enrich and perfect the 600MW steam turbine system model, which is used as a platform to analyze the energy consumption of the 600MW steam turbine system. The effects of steam pressure loss, heat loss of heater and hydrophobic cooler on the energy consumption of the system are studied, and the quantitative analysis is carried out. The results show that, The extraction pressure loss and heat dissipation loss of the high pressure heater have a great influence on the economy of the system, and the economic effect of adding the hydrophobic cooler is relatively small. Through the deep research on the energy consumption analysis of the system, the paper puts forward the direction of optimizing the system structure of the unit, and studies the two structural optimization methods of the hybrid heater and the low temperature economizer. The energy saving benefits of three kinds of hybrid heater retrofit schemes and four low temperature economizer connection schemes under THA conditions are analyzed. The better hybrid heater retrofit scheme and the low temperature economizer connection scheme are compared. The energy saving changes of the two optimal schemes under different working conditions are calculated and analyzed. The results show that the two schemes maintain good energy saving benefits under low load. Considering the influence of shunt coefficient on energy saving of cryogenic economizer under various working conditions, the optimal shunt coefficient under each working condition is calculated, which provides theoretical guidance for the practical transformation of steam turbine system.
【学位授予单位】：华中科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TM621

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