300MW机组高背压供热改造及运行优化研究

发布时间：2018-11-14 11:32

【摘要】：高背压供热将汽轮机组凝汽器内压力提高,提升汽轮机排汽压力和温度,使凝汽器成为供热系统中的热网加热器,直接对热网循环水进行加热,充分地利用了汽轮机排汽的汽化潜热,将散失到环境中冷源损失降低为零,大大提高了机组的热效率。在能源紧缺和环保压力的双重作用下,北方城市的很多热电联产机组正在逐渐向高背压供热方式转型改造机组的容量级别也在探索中不断增大,努力做到更加得高效环保。研究主要以300MW湿冷机组高背压供热为研究对象,研究纯凝机组高背压改造技术,结合机组的实际运行参数,对机组的热经济性能进行了理论的计算与分析,得出高背压改造后机组的经济参数,进而找出最佳运行方式方法。研究以华电青岛公司的#2机组高背压供热改造项目为案例,介绍了机组的改造方案,并选取机组运行的典型工况参数进行热经济性的计算分析,结合公司供热实际,对不同外界供热条件下的运行方式进行了优化研究,得到不同气候条件下的最佳运行方式。同时还从能量利用的角度进行了优化研究,通过运用总能系统理论,努力减少换热过程中高品位能量的(火用)损失。
[Abstract]:The high back pressure heating will increase the pressure inside the condenser of the steam turbine unit, raise the steam turbine exhaust pressure and temperature, make the condenser become the heating network heater in the heating system, and directly heat the circulating water of the heat network. The latent heat of vaporization of steam turbine exhaust is fully utilized, and the loss of cooling source is reduced to zero, which greatly improves the thermal efficiency of the unit. Under the dual action of energy shortage and environmental pressure, many cogeneration units in northern cities are gradually transforming to high backpressure heating mode and the capacity level of retrofit units is also increasing in order to achieve more efficient environmental protection. The research mainly takes the high back pressure heating of 300MW wet cooling unit as the research object, studies the retrofit technology of pure condensing unit with high back pressure, and combines the actual operation parameters of the unit, carries on the theoretical calculation and analysis to the thermal economic performance of the unit. The economic parameters of the unit after high back pressure retrofit are obtained, and the best operation method is found out. Taking the high back pressure heat supply renovation project of No. 2 unit of Huadian Qingdao Company as an example, this paper introduces the retrofit scheme of the unit, and selects the typical operating condition parameters of the unit to calculate and analyze the thermal economy, combining with the heating practice of the company. The optimal operation mode under different climate conditions is obtained by optimizing the operation mode under different external heating conditions. At the same time, the optimization research is carried out from the point of view of energy utilization. By using the theory of total energy system, the exergy loss of high-grade energy in the process of heat transfer is reduced.
【学位授予单位】：华北电力大学(北京)
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM621

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