燃煤电厂湿烟羽消除设计方案对比分析

摘要/Abstract

摘要：

湿法脱硫净烟气遇冷凝结析出水分,在烟囱出口形成湿烟羽，造成一定的视觉污染。通过分析湿烟羽生成和治理机理，探讨了环境温度和湿度对消除湿烟羽的影响。利用烟气加热、烟气降温、烟气降温再热等技术对某电厂的湿烟羽消除效果进行对比分析，得出冷却降温+间接换热+热二次风混合为最适应方案。此外，对某电厂的降温+再热方案进行分析，在净烟气管壳式换热分别下降3，5，7℃时，对比了不同材质和形式的降温换热器和再热换热器组合的经济回收期。结论为消除湿烟羽的整体静态回收周期随着降温段温度的降低而缩短，宽通道板式冷凝换热器和宽通道板式再热器的组合最为经济。

关键词:

">">燃煤电厂, 湿烟羽, 冷凝法, Aspen plus 模拟, 宽通道板式换热器, 经济分析">

Abstract:

The moisture in flue gas after WFGD would be precipitated and form a wet plume at the chimney outlet, which causes certain visual pollution. By analyzing the mechanism and treatment of wet plume, the effects of ambient temperature and humidity on the elimination of wet plume are discussed. The effect of techniques on eliminating the wet plume of a power plant is compared and analyzed between flue gas heating, flue gas cooling, and flue gas cooling plus reheating. The technique which includes cooling, indirect heat exchange and hot secondary air mixing is the most suitable one. In addition, the cooling plus reheating scheme of a power plant is analyzed. When the temperature of flue gas shellandtube heat transfer decreases 3，5， and 7℃, the economic recovery period of the combination of cooling heat exchangers and reheat exchangers with different materials and various types are compared. The overall static recovery period of the wet plume elimination is shortened with the decrease of the temperature of cooling section, and the combination of the widechannel platetype condensing heat exchanger and the widechannel platetype reheater is the most economic.

Key words:

coalfired power plant, wet plume, condensation method, Aspen plus simulation, widechannel platetype heat exchanger, economic analysis

王争荣，耿宣，汪洋，夏怀鹏，付丽辉，沈明忠，沈建永，王凯亮. 燃煤电厂湿烟羽消除设计方案对比分析[J]. 华电技术, 2018, 40(9): 5-9.

WANG Zhengrong, GENG Xuan, WANG Yang, XIA Huaipeng, FU Lihui, SHEN Mingzhong, SHEN Jianyong, WANG Kailiang.

Comparative analysis of design schemes for wet plume removal in coalfired power plant

[J]. Huadian Technology, 2018, 40(9): 5-9.

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