直接空冷机组的防冻分析研究.pdf

上海交通大学
硕士学位论文
直接空冷机组的防冻分析及研究
姓名:黄家运
申请学位级别:硕士
专业:热能工程
指导教师:张丁旺;林磊
20090501
上海交通大学工程硕士学位论文摘要
直接空冷机组的防冻分析及研究

摘要

随着电力行业的迅速发展和火力发电厂大容量高参数汽轮机的
增加,超临界甚至超超临界机组得到广泛应用,由此产生的水资源问
题日益严重。我国是一个严重缺水的国家,水资源短缺已经成为制约
经济社会发展的主要因素。因此,直接空冷机组由于其显著的节水效
果,得到了迅速的发展,特别是在我国部分“富煤缺水”地区。
论文在比较直接空冷和间接空冷两种技术特点及应用情况的基
础上,较详细地介绍了直接空冷机组的热力系统和主要设备。通过分
析和研究,总结出空冷凝汽器冬季冻结的原因,为进一步研究直接空
冷机组的防冻问题提供了理论依据和技术准备。
论文重点针对直接空冷凝汽器在冬季启动、停机过程以及低负荷
运行阶段突出存在的冻结问题,进行分析和研究,结合调研和部分实
测数据,提出在设计和运行上防止直接空冷凝汽器冻结的措施。
分析表明,发展直接空冷机组符合我国水资源短缺的国情,解决
直接空冷机组冻结问题为其技术难点之一。论文作者以理论为依据,
联系工作实际,对直接空冷机组的防冻措施在设计和运行上提出了自
己的观点。文中提出的相关措施具有系统性、条理性、可操作性和创
新性的特点,为直接空冷机组的发展提供了一定技术保障。

关键词:直接空冷机组,防冻,分析与研究,设计
I
上海交通大学工程硕士学位论文 ABSTRACT
THE ANALYSIS AND RESEARCH OF PREVENTING
FREEZING ON THE DIRECT AIR-COOLING UNIT



ABSTRACT


Along with the rapid development of power industry and the
increase of large-capacity and high-parameter turbines used in power
plants, super-critical, even ultra-super-critical units are being put into a
very wide use, as a consequence, the water resource problem rising
therefrom is ing increasingly serious. In China, the shortage of
water resource is already a main factor restricting the economic and
social development. For this reason, benefiting from its outstanding
water-saving effect, the direct air-cooling unit is being developed very
fast, especially in the areas abound in coal but short of water.
The article firstly elaborates the two techniques, direct air-cooling
and indirect air-cooling, summarizes pares their respective
features, then particularly introduces the development and practical
application of direct air-cooling technique in , the article
interprets the thermal system and major equipments of direct air-cooling
unit. Through analysis and research, the article makes a summary about
the causes for congealment of air-cooling condenser in winter, in
preparation for the future research of an