三河电厂300MW燃煤机组烟气余热利用改造及节能分析

发布时间：2018-06-15 14:14

本文选题：低温省煤器 + 燃煤锅炉　；参考：《华北电力大学》2017年硕士论文

【摘要】：近几年来,随着我国对环保需求的提升,及发电技术水平的提高,如何降低煤耗、减少污染物排放,争取市场占有率是各个发电集团的首要问题。因此,对锅炉低温烟气进行余热回收、加以利用无疑是一项重要减排降耗措施。本文首先介绍了对烟气余热资源的分类及可采取的余热回收优化方案,针对低温烟气对相关部件的腐蚀问题进行详细的分析,并根据分析结果结合相关的理论与方法进行验证,从而为下一步对低温烟气回收及系统改造方案,奠定了良好的基础。结合理论基础,本文对三河电厂300MW燃煤机组进行深入的分析与研究,并根据其机组实际运行情况、现场设备布置,针对低温烟气余热回收设计提出切实可行的解决方案,并针对方案中回收装置的布置、介质来源与温度的选取、热交换装置管材的选择等方面进行讨论与研究,最终选择以凝结水混水为介质来对排烟余热进行回收的方案作为优选改造方案。最后,本文针对300MW典型燃煤机组的节能改造方案进行了全面的分析,并对低温余热回收改造方案的节能效果、水耗降低量、投资回报情况等,进行了相关计算及分析。由于本机组为供热机组,本文也对于夏季、冬季两种不同运行工况,就余热回收改造后运行方式进行了初步分析。肯定了低温省煤器的应用价值。
[Abstract]:In recent years, with the improvement of environmental protection demand and the improvement of power generation technology in China, how to reduce coal consumption, reduce pollutant emissions and strive for market share is the most important issue for power generation groups. Therefore, recovery and utilization of waste heat from boiler flue gas at low temperature is undoubtedly an important measure to reduce emission and reduce consumption. In this paper, the classification of waste heat resource and the optimal scheme of waste heat recovery are introduced, and the corrosion problem of the parts caused by low temperature flue gas is analyzed in detail, and the results are verified by the relevant theories and methods. It lays a good foundation for the scheme of low-temperature flue gas recovery and system reconstruction. Combined with the theoretical basis, this paper makes a deep analysis and research on 300MW coal-fired units in Sanhe Power Plant. According to the actual operation of the units and the layout of field equipment, a feasible solution for the design of low-temperature flue gas waste heat recovery is put forward. The layout of the recovery device, the selection of the medium source and temperature, the selection of the pipe material of the heat exchanger are discussed and studied. In the end, condensate mixed water was used as the medium to recover the exhaust heat. Finally, this paper makes a comprehensive analysis on the energy saving retrofit scheme of 300MW typical coal-fired units, and makes relevant calculation and analysis on the energy-saving effect, water consumption reduction and investment return of the retrofit scheme of low-temperature waste heat recovery. Since the unit is a heat supply unit, this paper also makes a preliminary analysis on the operation mode after the waste heat recovery and transformation for two different operating conditions in summer and winter. The application value of low temperature economizer is confirmed.
【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

【参考文献】