摘  要：为应对化石能源日趋枯竭和缓解全球气候变暖对人类生存的影响，世界各国能源都将提高能源有效利用及促进新能源发展上升为国家战略，分布式能源作为21世纪科学用能的最佳方式蓬勃兴起，已得到世界各国的广泛重视和应用。

　　　目前我国能源紧缺，而环境污染却日益严重。国家对于环保和节能产业也是趋于支持，对于热电联产项目更是关注。对热力发电厂系统的设计具有重大的意义。

　　　火电厂热力系统通常由若干个相互作用、协调工作、并具有不同功能的子系统组成，主要有蒸汽中间再热系统、给水回热系统、对外供热系统、废热利用系统、蒸发器系统、旁路系统和疏水系统。

　　　这次对N-125-13.34/550/550型机组发电厂系统进行了设计，主要设计了五种方案，将在正文中体现。不同的设计理念，不同的设计参数，都是要研究出最为完美的设计方案。从而得到最为节能,高效的的热力系统。每种方案都详细的对回热加热系统；给水除氧系统；辅助加热系统等进行了计算，附加原则性系统图。最后对五种方案进行的对比，选择了一个最佳方案。最后,对选用设备进行了汇总。

关键词:热力系统；回热加热系统；给水除氧系统；辅助加热系统

Abstract:As a response to the depletion of fossil fuels increasingly and alleviate the effects of global warming on human existence, world energy will increase energy efficiency and promote the development of new energy into national strategies, distributed energy to best of boom as 21st century science, has received extensive attention and application from around the world.

　　　China’s energy shortage and environmental pollution has become increasingly serious and energy-saving industry, system design of thermal power plant is of great significance.

　　　Thermal power plant thermodynamic system typically consists of a number of interactions, coordination, and has a different function subsystem, mainly with steam reheat systems, heating systems, heat recovery systems, evaporators bypass system and drainage system.

　　　The N-125-13.34/550/550/-unit power plant system for the design, the main five programmers have been designed and will be reflected in the baby. Different design concepts, different design parameters, are to work out the most perfect design, to get the most energy-saving, efficient heating systems. Each of these scenarios is detailed on the regenerative heating system; water desecrating system; calculation of auxiliary heating system, additional system in principle. Comparison of the last of five programmers, selected a best solution. Last, Summarizes on the selected device. 　

Key words: Thermal system；Back to heat heating system；Water supply oxygen system; Auxiliary heating system