600MWe超超临界锅炉鳍片省煤器传热特性研究

发布时间：2018-01-22 08:15

本文关键词： 鳍片省煤器设计工作运行与测试传热关联式数值模拟　出处：《清华大学》2015年硕士论文　论文类型：学位论文

【摘要】：火电依然是我国能源结构体系中的主力电源。随着经济的发展,能源供应紧张的问题日益突出;随着电力工业规模不断扩大,其自身的能源消耗也日益严峻。如何降低煤耗,提高机组效率是摆在电力工作者面前的一道难题。鳍片省煤器作为强化换热的一种形式,能够有效的降低锅炉排烟温度,提高锅炉热效率,降低煤耗。近几年,它得到了广泛的应用,不仅出现在锅炉改造应用中,也出现在大型新建锅炉中。2011年新建的菏泽电厂2×600MWe超超临界机组就应用了鳍片省煤器。本论文以菏泽电厂的鳍片省煤器为研究对象。首先,介绍了其设计工作。省煤器的种类繁多,特点与应用各不一样。为了适应多煤种要求,达到换热要求、抗沾污性强和耐磨损的目标,根据自身的工程经验,设计了直肋鳍片省煤器。对比光管省煤器,直肋鳍片省煤器在结构和性能上具有优势,如换热强、抗沾污性好以及耐磨损,在经济上也能节约成本。为了得到直肋鳍片省煤器的传热系数,在#1炉上进行了工业试验。试验获得了直肋鳍片省煤器在640MWe和500MWe工况下的传热系数。通过理论分析和计算,得到直肋鳍片的省煤器的烟气侧传热关联式,并与《锅炉机组热力计算标准方法》(原苏联1973年版)和外方引进技术标准进行了对比分析。在上述工作基础上,对直肋鳍片省煤器进行了数值模拟。模拟了测试工况,进行了变结构参数的模拟,提出了直肋鳍片省煤器的一些优化方案。最后,作者对所做的工作进行了总结,提出了一些完善建议和步骤。
[Abstract]:Thermal power is still the main source of power in the energy structure of our country. With the development of economy, the problem of energy supply is becoming more and more serious. With the expansion of power industry, its own energy consumption is becoming increasingly serious. How to reduce coal consumption. As a form of enhanced heat transfer, finned economizer can effectively reduce boiler exhaust temperature, raise boiler heat efficiency and reduce coal consumption. It has been widely used, not only in the boiler transformation application. In 2011, 2 脳 600MWe ultra-supercritical unit of Heze Power Plant applied finned economizer. In this paper, the finned economizer of Heze Power Plant is taken as the research object. . The design work is introduced. There are many kinds of economizer, and the characteristics and applications are different. In order to meet the requirements of multi-coal, to achieve the heat transfer requirements, strong pollution resistance and wear resistance, according to its own engineering experience. The straight-ribbed fin economizer is designed. Compared with the light tube economizer, the straight-ribbed fin economizer has advantages in structure and performance, such as strong heat transfer, good anti-fouling and wear resistance. In order to obtain the heat transfer coefficient of the straight-ribbed fin economizer, the cost can also be saved economically. Industrial tests were carried out on #1 furnace. The heat transfer coefficients of the straight-ribbed finned economizer under the operating conditions of 640 MWe and 500 MWe were obtained by theoretical analysis and calculation. The heat transfer correlation on the flue gas side of the economizer with straight ribbed fins is obtained. It is compared with "Standard method of Thermal calculation for Boiler Unit" (former Soviet Union, 1973) and imported technical standard. On the basis of the above work, this paper makes a comparison and analysis. The numerical simulation of the straight-ribbed fin economizer is carried out. The test conditions are simulated, the variable structure parameters are simulated, and some optimization schemes of the straight-ribbed fin economizer are put forward. Finally. The author summarizes the work done and puts forward some suggestions and steps.
【学位授予单位】：清华大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TK229.2

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