回热式背压小汽轮机驱动引风机系统设计与实现

发布时间：2018-06-12 18:51

本文选题：超超临界 + 汽动引风机　；参考：《华北电力大学》2017年硕士论文

【摘要】：本文通过对国家节能减排改造计划和苏锡地区经济发展的解读,抓住区域小热电关停和供热需求持续新增这对主要矛盾,并分析660MW超超临界机组由纯发电改为热电联供的可行性。确定了可以通过改造引风机来新增供热源。引风机改造同时还可以优化锅炉尾部风烟系统,将原有引风机和增压风机合二为一,简化烟道结构,降低尾部烟气阻力,提高锅炉经济性。论文主要研究内容有:1.由于新引风机需要替代原有引风机和增压风机的出力,所以本文将详细比较当前工业应用中各类常见的引风机调节方式和动力选型。根据以供热为主要改造目标的实际需求,最后将风机选型确定为静叶调节加回热式背压小汽轮机驱动。2.根据所拟选定的引风机选型方案,设定新的控制策略和逻辑。在探究新的设定时,本文将主要从引风机作为锅炉重要辅机这个角度进行阐述。做为锅炉重要辅机时,将分别讨论引风机在启动、正常运行、停用、RB事故工况,这四种不同的应用场景所对应不同的控制策略和逻辑。3.工业应用总离不开对经济效益的分析,本文力求精确详尽的对供热所能产生的经济效益、引风机改造的成本、所拟选定引风机选型方案的经济性、环保性优势等方面进行分析。
[Abstract]:Based on the analysis of the National Energy-saving and Emission reduction Reconstruction Plan and the economic development of Suxi region, this paper grasps the major contradiction between the shutdown of small regional heat and power plants and the continuous increase of heat supply demand. The feasibility of converting 660 MW ultra-supercritical unit from pure generation to combined heat and power supply is analyzed. It is determined that the new heating source can be added by reforming the induced fan. At the same time, the retrofit of induced fan can optimize the air smoke system at the back of the boiler, combine the original draft fan with the pressurized fan, simplify the flue structure, reduce the flue gas resistance, and improve the boiler economy. The main content of this thesis is: 1. Since the new induced fan needs to replace the original induced fan and the pressurized fan, this paper will compare in detail various kinds of common regulating ways and power selection of the induced fan in the current industrial application. According to the actual demand of taking heat supply as the main target of retrofit, the type selection of fan is determined to be the drive of small steam turbine with static vane regulation plus regenerative backpressure. The new control strategy and logic are set according to the selected scheme of draft fan selection. In order to explore the new timing, this paper will mainly from the point of view of the draft fan as an important auxiliary machine of boiler. As an important auxiliary machine of boiler, this paper discusses the starting, normal operation and stopping of RB accident condition of induced fan respectively. These four different application scenarios correspond to different control strategy and logic .3. The industrial application is always inseparable from the analysis of the economic benefits. This paper tries to make an accurate and detailed analysis of the economic benefits that can be generated by heating, the cost of the transformation of the induced fans, the economy of the selected scheme of the type selection of the induced fans, the advantages of environmental protection, and so on.
【学位授予单位】：华北电力大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM621.3

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